Method to prepare bleached paper material and paper item (its version)

FIELD: textile, paper.

SUBSTANCE: method to prepare bleached paper material includes production of a bleached paper material and putting the latter in contact with efficient quantity of one or more oxidants, excluding organic peroxyacids. The method to produce a paper item includes production of a bleached paper mass. Water suspension from this mass is created. The suspension is dehydrated to make a sheet and drying. At the same time efficient quantity of one or more oxidants are added into the bleached paper mass or its suspension, excluding organic peroxyacids. Or an efficient quantity of one or more oxidants are added onto a sheet, including organic peroxyacids. The method to produce a paper item (a version) includes production of a bleached paper mass and creation of a thick suspension from it. Then the efficient quantity of one or more oxidants are added into the thick suspension, as well as one or more optical bleaches. Afterwards the thick suspension is dissolved, dehydrated to produce a sheet and dried. When using oxidants in a combination with optical bleaches and/or chelating agents, a synergetic effect is observed.

EFFECT: increased and stabilised brightness of a paper mass or paper and increased stability to their yellowing.

24 cl, 9 tbl

 

The technical FIELD

This invention relates to compositions and methods for improving the brightness and optical properties, prevent the loss of brightness and increase resistance to thermal yellowing in the production of pulp and paper. In particular, this invention relates to compositions comprising oxidizing agents, either by themselves, or in the presence of optical whitening agents effectively improve the brightness and optical properties of paper products, as well as increase its thermal stability.

The LEVEL of TECHNOLOGY

Paper pulp obtained by means of either mechanical or chemical pulping, has a color, which may be in the range from dark brown to cream, depending on the type of wood and the applied method of pulping. Pulp is bleached to obtain products from white paper for a multitude of applications.

Bleaching is the removal or modification of the light-absorbing substances contained in unbleached paper pulp. When bleaching mechanically processed paper pulp goal is bleaching paper pulp without dissolving lignin. Usually used or reconditioned (e.g. hydrosulfite sodium)or oxidizing (e.g., hydrogen peroxide bleach. Bleaching is often a multi-stage process for Bleaching chemically treated paper pulp is a continuation of delignification, which began at the stage of cooking. Bleaching is often a multi-stage process stage which may include bleaching with chlorine dioxide, oxygen-alkali delignification and peroxide bleaching.

The color change is attributed mainly to thermal aging, leads to yellowing and loss of brightness at different stages of production methods paper, which is used bleached pulp, and in the resulting paper product. The industry invests heavily in chemicals, such as bleach and optical bleaching agents, which improve the optical properties of the final paper or paper products.

For example, in WO 0052258 and WO 9932710 describes how the subsequent bleaching, in which pulp brighten to the desired whiteness using peroxyketal. In GB 2391011 described adding a composition comprising peracetic acid and hydrogen peroxide, in the thick raw materials before adding optical bleaching agents (ALE) to reduce the DAE required to achieve comparable brightness. In the publication Jukka Jakara et al., The effect of peracetic acid treatment of bleached kraft pulp in fine paper production, Preprint-PAPTAC Annual Meeting, 87th, Montreal, QC, Canada Jan. 30 - Feb. 1, 2001 (2001) described that the addition of peracetic acid in tanks for preparation of raw material for paper making machines reversion limits the brighter the STI bleached paper pulp and leads to significant savings add ALE in the paper machine. Cm. publications Jukka Jakara et al., The effect of peracetic acid in fine paper production, Appita Annual Conference Proceedings (2000), 54th(Vol.1), 169-174 and Jukka Jakara et al., The use of peracetic acid as brightening agent, Appita Ann. General Conf. Proc. (1999), 53rd(Vol.2), 463-467. In FI 104339 IN the described processing bleached raw materials peroxisomal before adding glue in neutral raw materials. In SA 2292107 described the preparation of the peroxide containing optical bleaching agents in capsulated form.

But at the moment the results are not satisfactory, and the economic losses due to color change and yellowing constantly pose a significant problem for the industry. Thus, there is a need for successful and practical solution to the problem of loss of brightness and undesirable yellowing of pulp and paper.

The INVENTION

In the present invention the proposed structures and ways to improve and stabilize the brightness and increased the resistance to yellowing in the paper manufacturing process.

In one aspect of the present invention, a method for preparing bleached paper material having high brightness and high resistance to thermal yellowing, comprising: i) obtaining bleached paper material and (ii) bringing bleached paper material into contact with an effective amount of one Il is more oxidizing agents with the exception of organic peroxyketal.

In another aspect of the present invention, a method for manufacturing paper products with enhanced brightness and resistance to thermal yellowing, comprising: i) obtaining bleached paper pulp; (ii) creation of a water suspension of raw materials, including bleached pulp; and (iii) dewatering the suspension of the raw material to obtain a sheet and drying the sheet; and a) bleached pulp or slurry of the raw materials add an effective amount of one or more oxidizing agents, except organic peroxyketal, or (b) on sheet add an effective amount of one or more oxidizing agents, including organic peroxyacids.

The following aspect of the present invention, a method for manufacturing paper products with enhanced brightness and resistance to thermal yellowing, comprising: i) obtaining bleached paper pulp; (ii) creation of a water suspension of thick materials, including bleached pulp; (iii) adding to the thick raw materials an effective amount of one or more oxidants and one or more optical whitening agents; (iv) dilution water suspension of thick raw materials to obtain a diluted suspension of raw materials; (v) dehydration of diluted suspension of the raw material for sheet and vi) drying the sheet.

In od the second aspect of the present invention, a method for preventing the loss of brightness and yellowing of bleached paper material during storage, including adding in bleached paper material an effective amount of one or more oxidizing agents, except organic peroxyketal.

The following aspect of the present invention is proposed bleached paper material, which includes a mixed product of bleached paper pulp and effective amount of one or more oxidizing agents and specified bleached paper material has a higher brightness and a high resistance to thermal yellowing compared to the same paper weighing not processed by these oxidants.

The applicant also found that oxidants in combination with chelat forming agents effectively increase the brightness of paper products, and found that the oxidizing agents used in combination with optical bleaching agents, enhance the effect of optical whitening agents and improve the color scheme. Thus, in additional aspects of the present invention proposed methods of application of oxidants in combination with chelat forming agents and/or optical bleaching agents to obtain bleached paper materials with a higher brightness, high resistance to thermal yellowing and superior color schemes.

The oxidant, optical bleaching agents, hepatoblastoma agents mo is but it can be used separately or in combination with known additives for improving the quality of the desired paper products.

DETAILED description of the INVENTION

In the present invention proposed an improved method of manufacture of paper and paper products having a high optical brightness. Sustainability brightness to thermal yellowing, enhance color and increase the brightness of bleached pulp and paper products, made from bleached paper pulp, can be achieved by adding one or more oxidizing agents, as defined here, in pulp, paper, cardboard or thin paper at any stage of the manufacturing process of paper.

The term "brightness" is used to describe white paper pulp or paper on a scale from 0% (totally black) to 100% (relative standard MgO, absolute brightness which is approximately 96%) reflectance of blue light (457 nm) from the paper. Heat loss of brightness is a loss of brightness of the paper and paper pulp under the influence of time, temperature and humidity (non-photochemical loss of brightness). "The loss of brightness when storing represents a heat loss of brightness over time in storage conditions.

Yellowing of bleached paper material (return to the original brightness) represents the loss of brightness of bleached paper pulp, paper, cardboard, fine paper and similar materials made from bleached paper pulp, for some the first time. Used here, the term "bleached paper material" includes bleached pulp and paper products made from such pulp.

Described here oxidants suitable for use with any bleached paper material used in manufacturing processes of paper, any paper product made from bleached paper pulp. Used herein, the term "bleached paper material" means bleached pulp and paper products, made from bleached paper pulp including paper, cardboard, fine paper, etc.

According to this invention, the oxidizing agents include chemical substances that can convert a functional group in a white-washed paper material category with a lower degree of oxidation in a category with a higher degree of oxidation. The advantages of this transformation include improving the sustainability of brightness in paper machine and improving the efficiency of optical whitening agents.

Typical oxidants include, but are not limited to, hydrogen peroxide, organic peroxyacids, organic and inorganic peroxides (hydroperoxides), superoxides and peroxide-superoxides, inorganic peroxyacids and their salts, peroxyhydrate, water-soluble organic peroxides, in the including dioxirane, nitric oxide, nitrosodimethylamine, hypochlorites, hypobromites, chlorites, chlorates and perchlorates, bromates, chlorine dioxide, chloramines, chloramide, chlorosulfonic, bromaline, Bromley, pomalidomide, chlorosulfonic acid, chlorine and the combination of all the above substances.

Used here, the term "hydrogen peroxide" means N2About2.

The term "organic peroxynitrate" means a compound of the formula R1C(O)O2H and its salts with metals, where R1selected from alkyl, alkenyl, aryl and arylalkyl. Typical representatives of organic peroxyketal include peroxybenzoyl acid6H5S(O)UN, peracetic acid (NAA) CH3S(O)UN, naturalyou acid NA(O)UN, nadrejenemu acid CH3CH2S(O)UN and similar compounds.

The term "inorganic peroxides" means monobasic (hydroperoxides) and dibasic (peroxides) metal derivatives of hydrogen peroxide H2About2including derivatives of alkali and alkaline earth metals such as sodium hydroperoxide (NaOOH)peroxide magnesium (MgO2) and similar compounds.

The term "superoxide" means metal derivatives containing the group About2-including derivatives of alkali and alkaline earth metals such as sodium superoxide (NaO2), superoxidase (Sa(O 2)2) and similar compounds.

The term "peroxide-superoxides" means mixed derivatives of alkali metals of the formula MO2ˇM2About2where M represents an alkali metal, such as2About3and similar compounds.

The term "inorganic peroxyacids and their salts" means inorganic acid, containing the group-O-O-, including peroxomonosulfate containing the group-UN, and peroxid and acid, containing the group-O-O-, and their metal salts, for example peroxymonosulfate acid (acid Caro (HO)2SO2OOH, peroxidizable acid (HOSO2OOSO2OH), peroxymonosulfuric acid (H3PO5peroxymonosulphate Na2CO4PEROXYDICARBONATE Na2C2O6and similar compounds.

"Peroxyhydrate are inorganic salts containing crystallization, hydrogen peroxide, such as peroksigidrat sodium metasilicate, Na2SiO3ˇH2O2ˇH2O, peroksigidrat borate sodium NaBO2ˇH2About2ˇ3H2And similar compounds.

"Organic peroxides" represent any organic chemical compounds containing the group-O-O-, including organic peroxyacids, as defined here, dioxirane, such as dimethyldioxirane (CH3)sub> 2CO2and similar compounds.

"Nitrosodimethyl" are salts of alkali and alkaline earth metals and microsociological acid, such as nitrosodimethyl potassium (salt Free) (KSO3)2NO, and similar compounds.

"Hypochlorite", "chlorites, chlorates and perchlorates are soluble metallic salt of hypochlorous HOCl, chloride lO, karnavati HOClO2and chlorine HOClO3acids, respectively, such as sodium hypochlorite NaOCl and similar compounds.

"Hypobromite and bromates are water-soluble salt bromoviridae HOBr and banowati Nugo3acids, respectively, such as hypobromite sodium NaOBr and similar compounds.

"Chloramines" and "bromaline represent ammonium derivatives of the formula NHxHalywhere Hal represents Cl or Br, or alkylamidopropylamine NR1R2Halxwhere R1and R2defined above, and the indices x and y independently of one another are equal 1-3. In aqueous solution chloramines and bromamines can be represented in the form of the corresponding ammonium salts.

"Chloramine" and "bromamide are amide derivatives containing the group-C(O)N(R1)pHqHalrwhere Hal is as defined above, the indices p and q independently from each other equal 0-1, and the Indus is with r equal 1-2, such as products, resulting in a mixture of sodium hypochlorite NaClO and urea H2NCONH2or sodium hypochlorite NaClO and 5.5-dimethylhydantoin, and similar compounds.

"Chlorosulfonic and pomalidomide are amide derivatives containing group,- SO2N(R1)pHqHalrwhere R1Hal, the indices p, q and r are defined above, such as the products formed in a mixture of sodium hypochlorite NaClO and sulphonamide H2NSO2NH2and similar compounds.

"Chlorosulfonic acid" is a chemical compound of the formula ClSO3H.

The term "alkyl" means a monovalent group obtained by removing one hydrogen atom from a saturated hydrocarbon with a linear or branched chain. The alkyl may be unsubstituted or substituted one or more than one group selected from amino, alkoxy, hydroxy groups and halogen. Typical alkyl groups include methyl, ethyl, n-propyl and isopropyl, n-butyl, sec-butyl, isobutyl and tert-butyl and the like groups.

The term "alkylene" means a divalent group obtained by removing two hydrogen atoms from a saturated hydrocarbon with a linear or branched chain, for example methylene, 1,2-ethylene, 1,1-ethylene, 1,3-propylene, 2,2-dimethylpropylene and similar groups.

The term "amino" means is the group of formula-NY 1Y2where Y1and Y2independently from each other selected from H, alkyl, alkenyl, aryl and arylalkyl. Typical amino groups include amino (-NH2), methylamino, ethylamino, isopropylamino, diethylamino-, dimethylamino-, methylaminopropyl and similar groups. In an aqueous solution of amines can be represented in the form of the corresponding ammonium salts.

The term "aryl" means an aromatic carbocyclic radicals and heterocyclic radicals, comprising from 5 to 14 atoms in the ring. Aryl can be unsubstituted or substituted by one or more groups selected from amino, alkoxy, hydroxy groups and halogen. Typical aryl groups include phenyl, naphthyl, tenantry, antracol, pyridyl, furyl, pyrrolyl, chinoline, thienyl, thiazolyl, pyrimidyl, indolyl and the like groups.

The term "arylalkyl" means an aryl group attached to the original molecular fragment through alkylenes group. Typical representatives arylalkyl groups include benzyl, 2-phenylethyl and the like groups.

The terms "halo" and "halogen" means chlorine, fluorine, bromine and iodine.

The term "salt" means a salt of a metal, ammonium, substituted ammonium or phosphonium with organic or inorganic anionic counterion. Typical metals include sodium, lithium, potassium, cal the Nations magnesium and similar metals. Typical representatives of anionic counterions include sulfite, bisulfite, sulfoxylate, metabisulfite, thiosulfate, polythionate, hydrosulfite, formamidinesulfinic and similar compounds.

The oxidizing agent can be used in combination with one or more activators". Activators include compositions that enhance the effect of oxidant through the catalysis of the oxidation reaction or change in pH, or by both factors. Typical activators include, but are not limited to, phosphoric acid, sodium dihydrophosphate, sodium hydrosulphate, sodium bicarbonate, TEMPO (2,2,6,6-tetramethylpiperidinyloxy), 4-hydroxy-TEMPO (4-hydroxy-2,2,6,6-tetramethylpiperidinyloxy), ammonium molybdate, tetraacetylethylenediamine (TAED) and changing the pH of the chemical compounds that affect the rate of oxidation, for example acetic acid. The term "activated oxidant" means the oxidizing agent used in combination with one or more activators. In some embodiments of the present invention, the oxidizing agent is an activated hydrogen peroxide.

In some embodiments of the present invention bleached paper material can be processed by one or more oxidants and one or more reducing agents. "Reducers" are chemical substances that transform function is optional groups in a white-washed paper material of the categories with a higher degree of oxidation in a category with a lower degree of oxidation. The use of reducing agents to improve and stabilize the brightness and increase resistance to yellowing in the paper manufacturing process described in the simultaneously filed application for U.S. patent No. 11/379499 from March 23, 2006

Typical reducing agents include sulfites, bisulfite, metabisulfite (pyrosulfite), sulfoxylate, thiosulfate, dithionite (hydrosulfite), polythionate, formamidinesulfinic acid and its salts and derivatives, the adduct of formaldehyde and bisulfite and other adducts of aldehydes and bisulfites, sulfinamide and ethers Sultanovich acids, sulfenamide and ethers Sultanovich acids, sulfonamides, phosphines, phosphonium salts of the phosphites and thiophosphites.

The term "sulfites" means duhsasana metal salts and sulfurous acid (H2SO3including duhsasana salts of alkali and alkaline earth metals such as sodium sulfite (Na2SO3), calcium sulfite (CaSO3) and similar compounds.

The term "bisulfite" means one-deputizing metal salts and sulfurous acid (H2SO3including one-deputizing salts of alkali and alkaline earth metals such as sodium bisulfite (NaHSO3), bisulfite magnesium (Mg(HSO3)2) and similar compounds.

The term "sulfoxylate" means salt sulfoxylates acid (H2SO2including sulfoxylate zinc (ZnSO 2) and similar compounds.

The term "metabisulfite (pyrosulfite)" means salt proserity acid (H2S2O5including sodium metabisulfite (Na2S2O5) and similar compounds.

The term "thiosulfate" means salt tournoi acid (H2S2O3including sodium thiosulfate (Na2S2O3) and similar compounds.

The term "Palatinate" means salt positionby acid (H2SnO6(n=2-6), including tritional sodium (Na2S3O6), salt ditionally acid (H2S2O6such as ditional sodium (Na2S2O6), and similar compounds.

The term "dithionite (hydrosulfite)" means salt dithionite (gidroservise, geoservices) acid, H2S2O4including dithionite (Hydrosulphite) sodium (Na2S2O4), dithionite magnesium (MgS2O4) and similar compounds.

The term "formamidinesulfinic acid (FASK)" means a compound of the formula H2NC(=NH)SO2H and its salts and derivatives, including sodium salt of H2NC(=NH)SO2Na.

The term "adducts of aldehydes and bisulfites" means the compounds of formula R1CH(OH)SO3H and their metal salts, where R1selected from alkyl, alkenyl, aryl and arylalkyl. Typical representatives of the adducts aldag the Dov and bisulfites include adducts of formaldehyde and bisulfite HOCH 2SO3Na and similar compounds.

The term "sulfonamide and ethers Sultanovich acid" refers to compounds of formula R1-S(=O)-R2where R1defined above, a R2selected from OR3and NR4R5where R3-R5independently from each other selected from alkyl, alkenyl, aryl and arylalkyl. Typical representatives of sulfonamides include ethylsulfinyl (CH3CH2S(=O)N(CH3)2) and similar compounds.

The term "sulfonamide and ethers Sultanovich acid" refers to compounds of formula R1-S-R2where R1and R2defined above. Typical representatives of sulfenamides include ethylsulfinyl (CH3CH2SN(CH3)2) and similar compounds.

The term "sulfonamides" means the compounds of formula R1-C(=S)-NR4R5where R1, R4and R5defined above. Typical representatives of sulfonamides include CH3CH2C(=S)N(CH3)2and similar compounds.

The term "phosphine" means derivatives of phosphine PH3usually organic substituted phosphines of the formula R6R7R8P, where R6-R8independently from each other selected from H, alkyl, alkenyl, aryl, arylalkyl and NR4R5where R4and R5defined above. Typical representatives of FOS is ins include trihydroxystilbene (NON 2)3P (CGMP) and similar compounds.

The term "phosphites" means derivative of phosphorous acid P(OH)3including organic substituted phosphites of the formula (R3O)(R4O)(R5O)P, where R3-R5defined above. Typical representatives of phosphites include (CH3CH2O)3R and similar compounds.

The term "theophostic" means derivative thiophosphoric acid HSP(OH)2including organic substituted thiophosphate formula (R3O)(R4O)(R5S)P, where R3-R5defined above. Typical representatives of thiophosphites include (CH3CH2O)2(CH3CH2S)p, and similar compounds.

The term "salt of the phosphonium" means organic substituted phosphines of the formula R1R3R4R5P+X-where R1and R4-R5defined above, and X is an organic or inorganic anion. Typical representatives of phosphonium salts include tricarboxymethyl (HO2CCH2CH2)3R+HCl-(DEFGH), bis-(tetrahydrocortisone)sulfate [(HOCH2)4P+]2(SO4)2-(CGMPS) and similar compounds.

The term "alkenyl" means a monovalent group obtained by removing one hydrogen atom from a hydrocarbon with a linear or R is Svetlanas chain containing at least one double bond in the carbon-carbon bonds. Alkenyl may be unsubstituted or substituted by one or more groups selected from amino, alkoxy, hydroxy groups and halogen.

The term "alkoxy" means an alkyl group attached to the original molecular fragment through an oxygen atom. Typical representatives of CNS groups include methoxy, ethoxy-, propoxy-, butoxypropyl and similar groups. Preferred are methoxy and ethoxypropan.

In one of the embodiments of the present invention the reducing agent is selected from the group consisting of substituted phosphines, sulfides, bisulfites and metabisulfites. The preferred reducing agent is sodium bisulfite.

The method according to the invention can be implemented in conventional papermaking equipment. Although papermaking equipment varies according to the action and mechanical design, and the ways they are made of paper with different hardware, contain General stages. The manufacture of paper usually includes the stage of pulping, the stage bleaching stage of preparation of raw materials, stage wet part and the stage of the dry end of the paper machine.

At the stage of obtaining cellulose individual cellulose fibers are separated from the source of cellulose or mechanical or chemical impact of the m, or both types of effects. Typical sources of cellulose include, but are not limited to, wood and similar "woody" plants, soybeans, rice, cotton, straw, linen), hemp, bagasse, lignindegrading plants and similar plants, as well as primary and recycled paper, thin paper and cardboard. This paper weight includes (but is not limited to) wood mass (DM), bleached wood pulp, thermomechanical pulp (TMP), bleached thermomechanical mass, chemi-thermomechanical pulp (CTMP), bleached chemi-thermomechanical mass peeled from the ink pulp, Kraft pulp, bleached Kraft pulp, sulfite pulp, and bleached sulfite pulp. Recycled paper pulp to bleach or not to bleach on the stage of recycling, but I think originally it was bleached. Any of the above described paper pulp that has not been previously subjected to bleaching can whiten, as described herein, to obtain bleached paper material.

In one of the embodiments of the present invention bleached paper material selected from the group consisting of primary paper pulp, recycled paper pulp, Kraft pulp, sulfite pulp, mechanical pulp, any combination of these types of BU the most important mass recycled paper, thin paper and any paper made of the above types of paper pulp, or combinations thereof.

An additional advantage of this invention is that it allows you to replace expensive Kraft pulp cheaper mechanical paper pulp in the Kraft mechanical paper grades for printing. The application described here chemical substances and methods increases the brightness and resistance to yellowing, therefore, allowing the use of larger quantities of mechanical paper pulp, with a corresponding cost reduction without loss of quality paper products.

At the stage of preparation of raw materials receive a suspension of paper pulp in water. At this stage in raw materials is also possible to introduce additives, such as brighteners, dyes, pigments, fillers, antimicrobial agents, defoamers, pH regulators and means for dewatering. Used in this description, the term "training materials" includes operations such as thinning, coarse filtered and purified suspensions of raw materials that can be implemented prior to sheet formation.

Stage wet end of the papermaking process includes applying a slurry of raw materials or suspension of paper pulp on the wire or felt paper machine for forming a continuous floor is TNA fibers, dehydration of the cloth and seal ("pressing") blade to obtain a sheet. For use in the method according to the invention can be any known paper machine. Such machines may include a cylinder machine, clinocerinae machine, forming machine, double wire netting machine for the production of thin paper and similar machines and their modifications.

At the stage of the dry part of the paper making process, the cloth is dried and possibly subjected to additional processing, such as size extrusion, calendering, coating of the surface modifiers, printing, cutting, crimping, etc. in Addition to the size press and kalenderwoche water camera on dried paper can be applied by spray coating using a sprayer boom.

In embodiments of the present invention, where the oxidizing agents added before forming the sheet of paper, using oxidizing agents other than organic peroxyketal. When the oxidant is injected after the tint of the paper or when the oxidant is added in a thick raw materials in combination with optical bleaching agents, use of oxidizing agents, including organic peroxyacids.

Thus, in embodiments where the oxidizing agents added before forming the sheet of paper, the oxidant can be selected from hydrogen peroxide, inorganic lane is xidos, of superoxide and peroxides of superoxide, inorganic peroxyketal and their salts, peroxyhydrate, water-soluble organic peroxides, nitrostilbenes, hypochlorites, hypobromites, chlorides, chlorates, bromato, perchlorates, chlorine dioxide, chloramines, chloramide, chlorsulfuron, bromamines, bromamide, bromsulphalein, chlorosulfonic acid, bromsulphalein acid and chlorine.

In other embodiments, where the oxidizing agents added before forming the sheet of paper, the oxidant can be selected from hydrogen peroxide, activated hydrogen peroxide, hypochlorites, hypobromites, chloramines, chloramide, chlorsulfuron, bromamines, bromamide, bromsulphalein, chlorosulfonic acid and bromsulphalein acid.

In embodiments where the oxidants added after the tint of the paper or when the oxidant is added in a thick raw materials in combination with optical bleaching agents, oxidizing agents can be selected from hydrogen peroxide, organic peroxyketal, inorganic peroxides, superoxide and peroxides of superoxide, inorganic peroxyketal and their salts, peroxyhydrate, water-soluble organic peroxides, nitrostilbenes, hypochlorites, hypobromites, chlorides, chlorates, bromato, perchlorates, chlorine dioxide, chloramines, chloramide, chlorsulfuron, bromamines, brough the amides, bromsulphalein, chlorosulfonic acid, bromsulphalein acid and chlorine.

In other embodiments, where oxidants added after the tint of the paper or when the oxidant is added in a thick raw materials in combination with optical bleaching agents, oxidizing agents can be selected from hydrogen peroxide, activated hydrogen peroxide, peracetic acid, hypochlorites, hypobromites, chloramines, chloramide, chlorsulfuron, bromamines, bromamide, bromsulphalein, chlorosulfonic acid and bromsulphalein acid.

The oxidizing agents can be prepared in advance or to obtain in situ of the mixed components, as is well known in this field. In some cases, it may be desirable preparation in situ, for example, when the desired oxidant is relatively unstable or rapidly consumed in the system. For example, peracetic acid and a mixture of peracetic acid and hydrogen peroxide can be prepared in situ by mixing hydrogen peroxide and tetraacetylethylenediamine. Hypobromite can be prepared in situ by mixing sodium bromide and sodium hypochlorite. Chloramines can be prepared in situ by mixing the bromide of ammonium, urea (urea) or dimethylhydantoin and sodium hypochlorite. Chlorosulphonate can be prepared in situ by mixing sodium bromide, sodium hypochlorite and sulfamic acid.

C the applicant has also discovered, that oxidants in combination with chelat forming agents, as described below, effectively enhance the brightness of paper products by improving thermal stability of paper pulp and reducing the amount of chromophore structures in the paper pulp.

In one of the embodiments of the present invention in the bleached pulp or paper product to add one or more chelat forming agents. According to this embodiment is suitable, hepatoblastoma agents include compounds capable of forming chelate complexes with transition metals, which form colored products with components of the pulp and catalyze the color-forming reaction in bleached paper pulp or paper products.

Typical representatives of chelat forming agents include, but are not limited to, organic phosphonates, phosphates, carboxylic acids, dithiocarbamate, salts of any of these components, and combinations thereof.

The term "organic phosphonates" means organic derivatives of phosphonic acid, HP(O)(OH)2containing a single link With-R, such as hydroxyethylidenediphosphonic acid HEDFC (HEDP) (CH3S(HE)(P(O)(OH)2)2), 1-hydroxy-1,3-propanediyl-bis-phosphonic acid PBFC ((BUT)2P(O)CH(OH)CH2CH2P(O)(OH)2); preferably containing dinaro the bond C-N, adjacent (vicinal) to link With-R, such as diethylenetriaminepentaacetic acid DMFC (DTMPA) ((HO)2P(O)CH2N[CH2CH2N(CH2P(O)(OH)2)2]2), aminotrimethylene acid AMP (AMP) (N(CH2P(O)(OH)2)3), polyaminopolycarboxylate acid PEMFC (RARER) (((HO)2P(O)CH2)2NCH(CH3)CH2(OCH2CH(CH3))2N(CH2)6N(CH2P(O)(OH)2)2), hexamethylenediaminetetra acid KMDMPK (HMDTMP) (((HO)2P(O)CH2)2N(CH2)6N(CH2P(O)(OH)2)2), hydroxyethylimino(phosphonic acid) EIBPC (NIRM) (N(CH2P(O)(OH)2)2CH2CH2OH) and similar compounds.

The term "organic phosphates" means organic derivatives of phosphoric acid P(O)(OH)3containing a single link With-R including triavir phosphoric acid and triethanolamine (N(CH2CH2OP(O)(OH)2)3) and similar compounds.

The term "carboxylic acid" means an organic compound containing one or more carboxyl groups,- C(O)HE, preferably aminocarbonyl acid containing single bond C-N, adjacent (vicinal) communication WITH CO2H, such as ethylenediaminetetraacetate acid etc (EDTA) ((BUT2CLO2)2NC 2CH2N(CH2CO2N)2), diethylenetriaminopentaacetic acid DTPC (DTPA) ((HO2CCH2)2NCH2CH2N(CH2CO2H)CH2CH2N(CH2CO2H)2) and similar compounds and their salts with alkali and alkaline earth metals.

"Dithiocarbamate include Monomeric dithiocarbamate, polymer dithiocarbamate, polydiethylene-dithiocarbamate, 2,4,6-dimercapto-1,3,5-triazine, disodium ethylene-bis-dithiocarbamate, sodium dimethyldithiocarbamate, and similar compounds.

In one of the embodiments of the present invention chelate forming agent selected from the group consisting of diethylenetriaminepentaacetic acid (DMFC, DTMPA) and its salts, diethylenetriaminepentaacetic acid (DTPC, DTPA) and its salts and ethylenediaminetetraacetic acid (add, EDTA) and its salts.

The applicant also found that the use of oxidizing agents in combination with optical bleaching agents (ALE) enhances the effect of optical whitening agents (ALE). Oxidants also improve the color scheme. This allows to reduce the number of ALE and clarifiers, such as blue dyes needed to achieve comparable brightness and color. Replacing some ALE and dyes oxidants allows producers of pulp and paper to reduce the cost of production and is isit the total number of participants ALE and dyes, while maintaining an acceptable level of brightness of paper products and achieving the specified color. In some cases, you can completely eliminate dyes and preserve the color.

Thus, in another embodiment of the present invention in the bleached pulp or paper product to add one or more optical bleaching agents (ALE).

"Optical bleaching agents are fluorescent dyes or pigments that absorb ultraviolet radiation and re-emit it with higher frequency in the visible range of the spectrum (blue), thereby causing the whiteness and brightness of a sheet of paper when added to the composition of the raw material. Typical representatives of optical whitening agents include, but are not limited to, azoles, biphenyl derivatives, coumarin derivatives; derivatives of furan; ion clarifiers, including anionic, cationic and anionic (neutral) connections, such as connections EccobriteŽ and EccowhiteŽ, available from Eastern Color &Chemical Co. (Providence (Providence), state of Rhode island); derivatives of naphthalimide; derivatives pyrazine; substituted (for example, sulfonated) stilbene, such as the number of optical bleaches LeucophorŽ, available from Clariant Corporation (Muttenz (Muttenz, Switzerland), and TinopalŽ from Ciba Specialty Chemicals (Basel, Switzerland); soliciting compounds, including (but not limited to, salts with alkali metals, salts with alkaline earth metals, salts with transition metals, organic salts and ammonium salts of these bleaching agents, and combinations of one or more of the above substances.

In one of the embodiments of the present invention optical bleaching agents are selected from the group consisting of desulfurating, tetrasulfonic and hexachlorophane ALE brands TinopalŽ.

Dosage of oxidants, reductants, chelat forming agents and/or optical bleaching agents is the number required to achieve the desired brightness and resistance to yellowing of bleached paper pulp or paper products made from bleached paper pulp; specialist in this area can easily be determined on the basis of the characteristics of the reducing agent, chelat forming agent or optical bleach, processed paper pulp or paper and method of administration. The reducing agents can be added to bleached paper material before or after oxidants. Hepatoblastoma agents and optical bleaching agents can be added before, after or simultaneously with oxidizing agents or can be mixed with oxidizing agents to be added to the bleached pulp material (paper weight).

An effective amount of OK is slitely, added to the bleached pulp or paper product is the quantity of oxidant that improves the brightness and resistance to thermal yellowing paper pulp or paper compared to paper pulp or paper, which are not treated with oxidants. Methods for determining the brightness and resistance to thermal yellowing described below.

Typically, the oxidizing agent added to the bleached pulp or paper product in an amount of from about of 0.0005 wt.% to about 2 wt.% in the calculation of the mass of kiln dried paper pulp, preferably from approximately 0.05 wt.% up to about 0.25 wt.%.

As noted above, the oxidizing agent can be used in combination with one or more reducing agents. The reducing agent can be added before or after the oxidizing agent. An effective amount of reducing agent added to the bleached pulp or paper product is the quantity of reducing agent which, in combination with oxidizing agents increases the brightness and resistance to thermal yellowing paper pulp or paper compared to paper pulp or paper, which are not treated with reducing agents.

Typically, the reducing agent added to the bleached pulp or paper product in an amount of from about 0.005 wt.% to about 2 wt.%, preferably from about 0.05 wt.% up rough is about 0.25 wt.% in the calculation of the mass of kiln dried paper pulp.

In normal use in the bleached pulp or paper product type from about 0,001% by weight to about 1 wt.%, preferably from about 0.01 wt.% to about 0.1 wt.% chelat forming agent on the basis of phosphonate, phosphate or carboxylic acids and/or from about 0.002 wt.% to about 0.02 wt.% chelat forming agent based on dithiocarbamates based on the weight of kiln dried paper pulp.

Optical bleaching agents are usually added in amounts from about 0.005 wt.% to about 2 wt.%, preferably from about 0.05 wt.% to about 1 wt.% in the calculation of the mass of kiln dried paper pulp.

Oxidants, reductants, hepatoblastoma agents and/or optical bleaching agents can be added to the bleached pulp or paper at any point in the process of making paper or thin paper. A typical point of introduction include (without limitation) introduction: (a) a suspension of paper pulp in a hidden drawer; (b) in the pulp after the stage of bleaching in cumulative, mixing or transmitting tank; (C) in the pulp after bleaching, washing and dehydration, followed by a drum or instant drying; (d) before or after the cleaners; (d) before or after the vane pump in the headbox of securities is-making machine; (e) purified from fibrous mass of water of the paper machine; (g) in the bunker or macalousso; (C) in the press section using, for example, a size press, a device for coating or spray nozzle; (and) in the drying section using, for example, a size press, a device for coating or spray nozzle; (K) on the calender with the use of a water chamber and/or (l) on the paper in the device for coating or sizing press outside the machine and/or (m) in the control unit folding into a roll.

The exact place where you want to add oxidants, reductants, hepatoblastoma agents and/or optical bleaching agents, depends on the specific equipment used, the exact conditions of the performed process and so on For the optimal efficiency of reductants, hepatoblastoma agents and/or optical bleaching agents can in some cases be added in one or more places.

The introduction can be performed by any means, traditionally used in manufacturing processes of paper, including "separated flow", in which a portion of the reductant, chelat forming agent and/or optical bleaching substances are injected at one point of the paper manufacturing process, for example in pulp or wet sheet (before drying cylinders), and the OST is vsuza part add the following point, for example in the sizing press.

In one of the embodiments of this invention, the oxidant is injected in bleached paper material in the form of diluted raw materials. For purposes of this embodiment of the "diluted raw materials" means raw material solution having a concentration of less than about 5%, based on dry solid.

In one of the embodiments of this invention, the oxidant is injected in bleached paper material in the form of thick materials, where "thick raw materials" means raw material solution having a concentration of from approximately 5% to approximately 30% (based on dry solid.

In one of the embodiments of this invention, the oxidizing agents applied to the wet sheet.

In one of the embodiments of this invention, the oxidant is injected in the sizing press.

Activators, hepatoblastoma agents and/or optical bleaching agents can be added to the bleached pulp or paper product before, after or simultaneously with the oxidizing agent and with each other. Any reducing agent should be added before or after the oxidizing agent.

In a typical application in which the use of reducing agents and optical bleaching agents, reducing agents can be added to bleached paper material before or after optical bleaching agents, for example in the mixing tank or in diluted raw materials.

In an alternative application of oxidants, opt the Cesky bleaching agents, hepatoblastoma agents can be added to bleached paper material in cumulative, mixing or transmitting tank, diluted raw materials or in the wet end and in the sizing press, and the relative dose of optical whitening agents, are added in the wet end, is lowered, and the relative dose of optical whitening agents added in the sizing press, raised on the basis that there is a higher efficiency of optical whitening agents in the sizing press, when they are used in combination with oxidizing agents, as described herein. The preferred oxidizing agent for use in the sizing press is peracetic acid.

The applicant also found that the addition of oxidizing agents and optical bleaching agents in the thick of raw materials increases the brightness of the bleached paper material that improves the stability of the brightness in the wet end and increases the fluorescence optical bleach (activation"ALE") compared to the addition of the oxidant in the thick raw materials, followed by the addition of ALE in the diluted raw materials. Oxidants can be added to a thick raw materials before, after and simultaneously with optical bleaching agents. Oxidants can also be confused with optical bleaching agents to be added to the thick raw materials. The preferred oxidizing agent according to this embodiment is peracetic acid.

You can also mix oxidants with any Gelato brazowski agents, optical bleaching agents and/or activators for the introduction of a single product in bleached paper material. A typical mixture composition includes an oxidizer, one or more activators, and optionally one or more chelat forming agents.

An alternative composition of the mixture includes one or more oxidants and one or more than one optical bleaching agents. This composition can be applied on damp sheet of paper by itself or in a mixture solution for surface sizing by drawing on wet paper. This composition can also be applied in the sizing press.

Oxidants, reductants, hepatoblastoma agents and/or optical bleaching agents can also be used in combination with one or more partially neutralized polycarboxylic acids, preferably such polycarboxylic acids as polyacrylic acid

(CH3CH(CO2H)[CH2CH(CO2H)]nCH2CH2CO2H), where the index n is from about 10 to about 50000. Polycarboxylic acid can be neutralized to a specified pH (usually 5-6, as discussed below) alkali such as sodium hydroxide.

Oxidants, reductants, hepatoblastoma agents, optical bleaching agents and polycarboxylate can also be used with other additives, Trad is largely used in the manufacture of paper to improve one or more properties of the final paper product, assistance to the paper production process or for both purposes. These additives are usually divided into functional additives and regulating supplements.

Functional supplements usually are supplements that are used for messages to the end of the paper product of some particularly desirable properties or to improve them; these additives include, but are not limited to, bleaching agents, dyes, fillers, adhesives, starch and binder.

Regulating supplements are supplements that are included during the paper manufacturing process to improve the process as a whole, without a significant effect on the physical properties of paper. Regulating additives include biocides, retaining additives, defoamers, pH regulators, regulators tar and drying additives. Paper and paper products, obtained using the method according to the invention may contain one or more functional additives and/or regulating additives.

Pigments and dyes tell the paper color. Dyes include organic compounds having a system of conjugated double bonds; azo compounds; metal-containing azo compounds, derivatives of anthraquinone; triazine compounds such as triarylmethane; quinoline and related modifications is to be placed; acid dyes (anionic organic dyes containing sulfopropyl used with natural additives such as alum); basic dyes (cationic organic dyes containing functional amino group) and direct dyes (acid dyes of the type having a high molecular weight and special direct affinity to cellulose); and combinations of the above compounds suitable for use as dyes. The thin-dispersed pigments are minerals that can be white or colored. Pigments which are most commonly used in the papermaking industry are clay, calcium carbonate and titanium dioxide.

Fillers added to paper to increase the opacity and brightness. Fillers include (not limited to) calcium carbonate (calcite); precipitated calcium carbonate (COC); calcium sulfate (including various hydrated forms); calcium aluminate; zinc oxide; magnesium silicates, such as talc; titanium dioxide (Tio2), such as anatase or rutile; clay or kaolin, consisting of hydrated SiO2and Al2O3; synthetic clay; mica; vermiculite; inorganic fillers; perlite; sand; gravel; Sandstone; glass beads; aerogels; xerogels; safe EMU is Sonny agar gel (seagel); fly ash; aluminium oxide; microspheres; hollow glass beads, porous ceramic balls; tube; seeds; light polymers; xonotlite (crystalline gel of calcium silicate); pumice; split rock; waste concrete products; partially hydrated or non hydrated hydraulic cement particles and diatomaceous earth, and combinations of these compounds.

Adhesive is added to the paper during the manufacturing process to ensure the resistance to penetration of liquids through the paper. Adhesives can be an internal adhesive or external (surface) adhesive and can be applied to strong sizing, poor sizing, or both sizing. More specifically, the adhesives include rosin; rosin, precipitated with alum (Al2(SO4)3); abietic acid and homologues abietic acid, such as neobyatnoy acid and levopimaric acid, stearic acid, and derivatives of stearic acid; a carbonate of ammonium zirconium; organosilicon compounds and products containing organosilicon compounds, such as RE-29, available from GE OSI, and SM-8715, available from Dow Corning Corporation (Midland, Michigan); fluorine-containing compounds of General formula CF3(CF2 nR, where R is an anionic, cationic or another functional group, such as Gortex; dimer of alkylbetaine (DUCK, AKD), such as Aquapel 364, Aquapel (I 752, Heron) 70, Hercon 79, Precise 787, 2000 and Precise Precise 3000, all of these products from Hercules Incorporated (Wilmington (Willmington, Delaware); and alilandry anhydride (AA, ASA); emulsion AA or DUCK with cationic starch, alum, including AA; starch; hydroxymethylpropane starch, carboxymethyl cellulose (KMTS); polyvinyl alcohol; methyl cellulose; alginates; paraffins (waxes); emulsion waxes, and combinations of these adhesives.

Starch is widely used in the manufacture of paper. For example, it performs the functions of retaining additives, substances that increase the strength in the dry state, surface and adhesive. Starches include, but are not limited to) amylose; amylopectin; starches containing different amounts of amylose and amylopectin, for example 25% amylose and 75% amylopectin (corn starch), 20% amylose and 80% amylopectin (potato starch); starches, processed by enzymes, hydrolyzed starches; heat treated starches, also known in this area as "klasterizovannykh starches"; cationic starches such as starches obtained by reaction of starch with a tertiary amine to education Thur technoi ammonium salt; anionic starches; ampholytic starches (containing both cationic and anionic functional groups); cellulose and derivatives of the compounds of cellulose and combinations of these compounds.

The method according to the invention leads to the production of paper products with bright surface. In addition, the new structure also protects the paper from color change over a long period of regular use.

The above can be better understood when referring to the following examples which are presented for illustrative purposes and are not intended to limit the scope of the present invention.

EXAMPLES

In these examples, to achieve the proper pH of the test substance or composition was added a sufficient quantity of 50%aqueous sodium hydroxide solution. All concentrations in these examples are indicated in wt.% based on the weight of dry paper pulp.

In these examples, the following symbols have the listed meaning.

Brightness is defined by ISO R457 (TAPPI 525); yellow - E; white - E; TMP - tmp; CTMP - chemical thermo mechanical pulp; MBM - purified mechanical paper pulp; ALE - optical bleach; add - ethylenediaminetetraacetic acid (HO2CCH2)2NCH2CH2N(CH2CO2H)2; TPC di is teletraining pentaoxa acid (HO 2CCH2)2NCH2CH2N(CH2CO2H)CH2CH2N(CH2CO2H)2; DMPK - H2O3PCH2N[CH2CH2N(CH2RHO3H2)2]2; NAA - peracetic acid.

Processing

Sheets of paper with a handmade character made from bleached paper pulp and then used them in experiments, in which the reducing agents were applied either wet sheet (before or after compression) to drum drying or after drum drying (temperature during drum drying - 100°C). The third possibility is the application of separated flow. Application for surface sizing was accompanied by another circulation of the drying drum.

The load solution of the test substance or composition was determined in the calculation of dry mass of the sample paper pulp. The solutions of the substance or composition was applied with the use of the rod, as far as possible evenly, in the form of aqueous solutions. The test sheets were dried using a laboratory drying cylinder in the same conditions (one rotation).

Sheets of paper with a handmade character produced using (a) a Buchner funnel (5 g of absolutely dry paper pulp, pressed and air-dried, diameter 15 cm) and (b) net forming cylinder for manual low tide type Noble & Wood (8 square inches (51,6 cm2), 60 g/m2

Testing equipment

Laboratory clothes dryer.

"Elrepho 3000", "Technidyne Color Touch 2 (ISO Model), or other device for measuring brightness.

Fluorescence spectrometer (Hitachi F-4500 or other device for measuring the relative fluorescence intensity.

The introduction of.

A set of tools for surface sizing (lining and cushion for 3rd glue).

Camera with constant humidity (23°C., humidity 50%).

Water bath/incubator containing floating plastic box with samples of paper.

Cuvette with a volume of 100 ml for the method of maceration.

The methodology is applied on a dry surface (surface sizing, the method of impregnation)

1. Paper handmade character size 8x8 inches (20,32×20.32 cm) produced by a standard method. Given dry weight of 2.5 g Wet sheet of paper with a handmade character was passed through one cycle of the drying drum.

2. Cut a strip of width 1/8 sheet (mass 0.31 g).

3. In vitro volume of 50 ml was prepared solutions pre-heat-treated starch (if required), and compound-reducing agent based on a predetermined capture rate and the specified dosage.

4. Put a strip of paper into the solution for 10 seconds, allowed to drain drops over 35 C and then passed it through p. the ECJ.

5. Dried test sheet on the drum and balanced it at room temperature.

6. Measured brightness and yellowness.

Methodology introduction to pulp

Chemicals were added directly to the paper mass (diluted raw material or thick material) was mixed with paper pulp in an airtight bags. In the improved method of introducing ALE in pulp chemicals were added directly to bleached Kraft pulp concentration of 20%, was mixed with paper pulp in an airtight bags and kept at 45-80°C for 30 minutes pulp was diluted to a concentration of 5%was added ALE, mixed with paper pulp and the suspension was kept at 50°C for 20 minutes and Then the suspension was further diluted and by the standard technique of prepared sheets of paper handmade character. ALE was added in the form of industrial product.

1. The joint introduction of the oxidant and the DAE solution for surface sizing

The authors found (see table 1)that optical bleaching agents can be combined with efficiency enhancers oxidant in the solution for surface sizing. In the General case, optical bleaching agents can react with oxidizing agents. However, the authors found that the conditions of the process of surface sizing are the residual soft to prevent this. Various oxidizing agents have a positive effect on the efficiency of optical whitening agents.

2. The introduction of various oxidants in the thick raw paper pulp (ALE injected after dilution of raw materials)

In this example (see table 2) in the dense raw materials has introduced a variety of oxidants, after which he entered the DAE in more diluted raw materials during the manufacturing process of paper. Some oxidants showed a synergistic effect with optical bleaching agents.

3. Synergistic effect of pre-treatment with oxidants on optical bleaching agents

Table 3
Kraft pulp from hardwood, air-dried sheets of paper handmade character. Stage 1: introduction of oxidizer concentration of 10%; 60°C, 3 hours stage II: introduction ALE - concentration 4%; 60°C, 20 min (with ALE or without ALE Tinopal ABP-A).
The oxidizing agentDosage, % active substances1The increase in brightness relative to ALE
NaOCl/NaBr/sulfamic acid is 1:1.5:20,0754,2
Monochloramine 0,0752,3
The sodium hypochlorite/dimethylhydantoin 1:10,0752,9
Hypochlorite sodium/urea 1:11,1-1,66,7
l% of active substance was determined by measurement of total residual chlorine in dilute sample according to the method 330.5 EPA (environmental protection Agency environment).

Table 4
Kraft pulp from hardwood, air-dried sheets of paper handmade character. Stage I: the introduction of oxidizer concentration of 10%; 60°C, 3 hours stage II: introduction ALE - concentration 4%; 60°C, 20 min (with ALE or Besov Tinopal ABP-A).
The oxidizing agentDosage, % active substances1The increase in brightness relative to the control sample (no ALE)The increase in brightness relative to ALE
NaOCl/NaBr/sulfamic acid is 1:1.5:20,0150,83,0
NaOCl urea 1:10,0151,12,0
1% of active substance was determined by measurement of total residual chlorine in dilute sample according to the method 330.5 EPA (environmental protection Agency environment).

The data given in tables 3 and 4 indicate a significant effect of different oxidants as activators ALE. Especially interesting is documented to significantly improve the efficiency of ALE in the absence of the actual bleaching using NAA.

4. Introduction of activated hydrogen peroxide

Table 5
Kraft pulp from hardwood, air-dried sheets of paper handmade character. Stage I: the introduction of oxidizer concentration of 10%; 60°C, 3 hours stage II: introduction ALE - concentration 4%; 60°C, 20 min (with ALE or without ALE Tinopal ABP-A).
The oxidizing agentThe increase in brightness relative to ALE
0.12% of N2About20,2
0,12% H2O2+ 0,79% tetraacetylethylenediamine 1,7
0,12% H2O2+ 0.5% sodium dihydrophosphate1,8
0,12% H2O2+ 0.05% ammonium molybdate1,0

Table 6
Kraft pulp from hardwood, air-dried sheets of paper handmade character. Stage I: the introduction of oxidizer concentration of 10%; 60°C, 3 hours stage II: introduction ALE - concentration 4%; 60°C, 20 min (with ALE or without ALE Tinopal ABP-A).
The oxidizing agentThe increase in brightness relative to ALE
0,0375% H2O20,5
0,0375% H2O2+ 0.5% sodium dihydrophosphate3,1
0,0375% H2O2+ 0.25% sodium dihydrophosphate2,6

Table 7
Kraft pulp from hardwood, air-dried sheets of paper handmade character. Stage I: the introduction of oxidizer concentration of 10%; 60°C, 3 hours stage II: the introduction of the OV - the concentration of 4%; 60°C, 20 min (with ALE or without ALE Tinopal ABP-A).
The oxidizing agentThe increase in Br relative to ALE
0.12% of N2About20,6
0.12% of N2O2+ 0,50% H3PO44,0
0.12% of N2O2+ 0,25% NaHCO31,7
0,12% H2O2+ 0,50% NaHCO34,3
0,12% H2O2+ 0,05% Nalco RO13,3
1Stabilizer - peroxide-based DMFC from Nalco Company, NAPERVILLE (Naperville, Illinois.

The data given in tables 5-7 illustrate different ways of activating the hydrogen peroxide, which leads to significant efficiency gains in the process.

5. Introduction oxidative compounds in dense and dilute raw materials: introduction oxidative compounds in dense raw materials together with ALE

Table 8
Solid wood, alkaline paper pulp, dried in dryer sheets boom and handmade character. Stage I: the introduction of oxidizer concentration of 10%; 60°C, 3 hours stage II: introduction ALE - concentration 4%; 60°C, 20 min (with ALE or without ALE Tinopal ABP-A).
The oxidizing agentThe increase in brightness relative to the DAE, concentration 4%The increase in brightness relative to the DAE, the concentration of 10%
NaOCl/NaBr/sulfamic acid is 1:1.5:2 (of 0.0125% of the active substances)0,21,1
0,09% H2O2+ 0.3% sodium dihydrophosphate0,51,0

Table 8 illustrates the introduction of oxidizing substances in pulp low (4%) and high (10%) concentration (solid wood, 0.35% of the DAE in the form of the product).

Table 9
Solid wood, dried in dryer sheets handmade character.
The oxidizing agentThe increase in brightness relative to the DAE, 0,45% ALE was added together with the oxidant at a concentration of 10%The increase in brightness relative to the DAE, the oxidant was added at a concentration of 10%; 0.45% of the DAE was added later, at a concentration of % (30 min, 60°C)
Paper weight No. 1, alkaline
0,019% NUS0,80,4
Paper weight No. 2, Kraft pulp
0,019% NUS1,8
0,038% NUS2,4
0,075% NUS2,5

Table 9 illustrates the efficiency of oxidizing substances, when the DAE and the oxidant is injected together into a thick raw materials (concentration 10%). For comparison, an example of a smaller increase in the brightness obtained by the sequential introduction of substances.

Although the present invention is described above in connection with typical or illustrative embodiments, these embodiments are not exhaustive or limit the invention. On the contrary, it is envisaged that the invention covers all alternatives, modifications and equivalents included in its nature and scope, as defined by the attached claims.

1. The method of preparation of the be the Yong paper material, having high brightness and high resistance to thermal yellowing, including:
i) obtaining bleached paper material and
ii) bringing the bleached paper material into contact with an effective amount of one or more oxidizing agents, except organic peroxyketal.

2. The method according to claim 1, further comprising bringing bleached paper material in contact with one or more optical whitening agents, with one or more chelat forming agents, or one or more reducing agents, or their combinations.

3. The method according to claim 1, where bleached paper material selected from the group consisting of primary paper pulp, recycled paper pulp, Kraft pulp, sulfite pulp, mechanical pulp, any combination of these types of paper pulp, recycled paper, thin paper and any paper or paper products made from these types of paper pulp, or combinations thereof.

4. The method according to claim 1, where the oxidizing agent is administered in combination with one or more activators.

5. The method according to claim 1, where the oxidizing agents selected from the group consisting of hydrogen peroxide, inorganic peroxides, superoxide and peroxides of superoxide, inorganic peroxyketal and their salts, peroxyhydrate, water-soluble organic peroxides, nitrostilbenes, g is polariton, hypobromites, chlorides, chlorates, bromato, perchlorates, chlorine dioxide, chloramines, chloramide, chlorsulfuron, bromamines, bromamide, bromsulphalein, chlorosulfonic acid, bromsulphalein acid and chlorine.

6. The method according to claim 1, where the oxidizing agent is selected from the group consisting of hydrogen peroxide, activated hydrogen peroxide, hypochlorites, hypobromites, chloramines, chloramide, chlorsulfuron, bromamines, bromamide, bromsulphalein, chlorosulfonic acid and bromsulphalein acid.

7. The method according to claim 2, where the reducing agent is selected from the group consisting of substituted phosphines, sulfides, bisulfites and metabisulfites.

8. The method according to claim 2, where the chelate forming agent selected from the group consisting of organic phosphonates, phosphates, carboxylic acids, salts of any of the previous components, and any combinations thereof.

9. The method according to claim 2, where the optical bleaching agents selected from desulfurating, tetrasulfonic or hexachlorophene derivatives of stilbene.

10. The method according to claim 2, where the chelate forming agent selected from the group consisting of diethylenetriaminepentaacetic acid (DTPMP) and its salts, diethylenetriaminepentaacetic acid (DTPC) and its salts and ethylenediaminetetraacetic acid (AGTC) and its salts.

11. The method according to claim 1, where the oxidant is injected in bleached paper material diluted raw materials or in dense raw materials.

12. A method of manufacturing a paper product having high brightness and resistance to thermal yellowing, including:
i) obtaining bleached paper pulp;
ii) creating an aqueous slurry of raw materials, including bleached pulp;
iii) dewatering the slurry raw material for sheet and
iv) drying the sheet, and
a) bleached pulp or slurry of the raw materials add an effective amount of one or more oxidizing agents, except organic peroxyketal, or
b) on sheet add an effective amount of one or more oxidizing agents, including organic peroxyacids.

13. The method according to item 12, further comprising adding one or more chelat forming agents, one or more optical whitening agents, one or more reducing agents or combinations thereof in bleached pulp, slurry raw material or sheet.

14. The method according to item 13, where the chelate forming agent selected from the group consisting of organic phosphonates, phosphates, carboxylic acids, salts of any of the previous components, and any combinations thereof.

15. The method according to item 13, where the optical bleaching agents selected from desulfurating, tetrasulfonic or hexachlorophene derivatives of stilbene.

16. The method according to item 13, where the chelate forming agent selected from the group consisting of Diethylenetriamine pentamethylenetetrazol acid (DTPMP) and its salts, diethylenetriaminopentaacetic acid (DTPC) and its salts and ethylenediaminetetraacetic acid (AGTC) and its salts.

17. The method according to item 13, where the reducing agent is selected from the group consisting of substituted phosphines, sulfides, bisulfites and metabisulfites.

18. The method according to item 12, where the oxidant is selected from the group consisting of hydrogen peroxide, organic peroxyketal, inorganic peroxides, superoxide and peroxides of superoxide, inorganic peroxyketal and their salts, peroxyhydrate, water-soluble organic peroxides, nitrostilbenes, hypochlorites, hypobromites, chlorides, chlorates, bromato, perchlorates, chlorine dioxide, chloramines, chloramide, chlorsulfuron, bromamines, bromamide, bromsulphalein, chlorosulfonic acid, bromsulphalein acid and chlorine.

19. The method according to item 12, where the oxidant is selected from the group consisting of hydrogen peroxide, activated hydrogen peroxide, peracetic acid, hypochlorites, hypobromites, chloramines, chloramide, chlorsulfuron, bromamines, bromamide, bromsulphalein, chlorosulfonic acid, bromsulphalein acid.

20. The method according to item 12, where oxidants add to the wet sheet, or add in bleached paper material in the sizing press.

21. The method according to claim 20, where the oxidant is a peracetic acid.

22. The way p is item 21, additionally including adding in bleached paper material in the sizing press one or more optical bleaching agents.

23. A method of manufacturing a paper product with improved brightness and resistance to thermal yellowing, including:
i) obtaining bleached paper pulp;
ii) creation of a water suspension of thick materials, including bleached pulp;
iii) adding to the thick raw materials an effective amount of one or more oxidants and one or more optical brighteners;
iv) dilution water suspension of thick raw materials to obtain a diluted suspension of raw materials;
v) dehydration of diluted suspension of the raw material to obtain a sheet;
vi) drying the sheet.

24. The method according to item 23, where the oxidant is a peracetic acid.



 

Same patents:

FIELD: textile, paper.

SUBSTANCE: full bleaching/extraction of craft cellulose fibres is carried out with a chorine agent. Afterwards fibres are washed and exposed to contact in solution with at least one optical bleach (OB) upstream the mixing box and the discharge box of the machine. Fibres in solution have consistency from 7 to 15%, pH of solution in process of contact of fibres with OB makes from 3.5 to 5.5, temperature of contact makes from 60 to 80°C, and time of contact is from 0.5 to 6 hours. Additional contact of OB with fibres is carried out in the device for coating application or in the gluing press. Contact may be carried out at the stage of storage, both at high density and low density of the craft-cellulose fibres, and also at the stage of refinement.

EFFECT: improved whiteness and brightness of fibres when using lower quantity of OB.

19 cl, 11 dwg, 12 tbl, 6 ex

FIELD: textile, paper.

SUBSTANCE: paper with counterfeit protection is used in production of securities and documents. Method to make paper with locally arranged protective elements includes formation of the first paper cloth on the first meshy cylinder. Deposition of water dispersion containing protective elements via nozzles at certain sections of moist paper cloth. Formation of the second paper cloth at the second meshy cylinder. Joining first paper cloth with deposited protective elements with the second paper cloth, and also pressing and drying. Water dispersion of protective elements contains at least one water-soluble polymer in amount of 0.1-3.0 wt %. At the same time dispersion of protective elements is supplied with controlled speed via nozzles, every of which is equipped with pump of auger type.

EFFECT: increased quality of paper due to reduction of pulsations of flow dispersion and increased stability of protective elements deposition process in strictly required amount at certain sections of paper cloth.

8 cl, 1 dwg, 1 tbl

FIELD: textile, paper.

SUBSTANCE: according to one version, method includes provision of aqueous suspension that contains cellulose fibres. Addition of cation polysaccharide and polymer P2, which is an anion polymer, to produced suspension after all points of high polymer P1 shearing force, and P1 polymer is an anion polymer. Then water is removed from produced suspension to form paper. According to the other version, auxiliary agents are added for drainage and retention to produced suspension of cellulose fibres after all points of high shearing force. The latter are represented by a cation polysaccharide and polymer P2, being an anion polymer.

EFFECT: improved drainage without deterioration in retention and forming of paper, increased speed of paper-making machine and application of lower doses of polymer.

34 cl, 5 tbl, 5 ex

FIELD: paper industry.

SUBSTANCE: invention may be used to apply coatings onto paper or cardboard substrate, which is a precursor of finished paper, cardboard, fabric, sheet of fibre board. Substrate is brought in contact with primer supplied from source of primer. Electrostatic deposition of primer onto substrate is carried out by means of electrospinning.

EFFECT: invention provides for high uniformity of deposition, including hard-to-access uneven surfaces.

19 cl, 3 tbl, 41 dwg

FIELD: paper industry.

SUBSTANCE: method includes preparation of paper mass that contains fillers and fibers. This paper mass is processed with polymers. Surplus of polymers is added to paper mass, alternating addition of cation and anion polymers at least in three stages. Then paper mass is dehydrated on mesh to produce fibrous cloth, which is pressed and dried. Paper web produced by this method contains at least 15 wt % of fillers. This method may be used to make paper product.

EFFECT: production of paper product of high quality with low costs.

7 cl, 3 dwg, 1 tbl, 10 ex

FIELD: paper industry.

SUBSTANCE: methods refer to manufacturing of bleached cellulose material, prevention of yellowing and loss of whiteness in bleached craft-cellulose, and manufacturing of paper goods. In process of bleached cellulose material manufacturing, bleached craft-cellulose is produced and exposed to contact with sufficient amount of more or several reducing agents. Additionally bleached craft-cellulose is exposed to contact with one or several optical bleach, with one or more chelating agent. Method for prevention of yellowing and loss of whiteness of bleached craft-cellulose in storage includes addition of efficient amount of one or more reducing agent into bleached cellulose and possibly one or more chelating agent, one or more polycarboxylate or their combinations. Method for production of paper goods includes production of bleached craft-cellulose, formation of initial water suspension from it, water drainage with formation of sheet and sheet drying. Besides efficient amount of one or more reducing agent is added into bleached craft-cellulose, initial suspension or sheet. Additionally one or more chelating agent is added there, one or more optical bleach, one or more polycarboxylate, or their combination.

EFFECT: improved quality of paper goods, increased stabilisation of whiteness and increased resistance to yellowing in process of paper production and to thermal yellowing, improved colour pattern.

17 cl, 33 tbl

FIELD: printing industry.

SUBSTANCE: device comprises at least one main moulding cylinder, containing moulding section and section of precipitation. Moulding section is installed inside moulding chamber, where paste-like paper is contained. Section of precipitation is installed under collecting mesh. Mesh serves for displacement along forwarding direction for reception on collecting surface of moulded sheet. Device is equipped with facility for precipitation of protective elements onto collecting surface, arranged further along with motion direction from the main moulding cylinder along forwarding direction of collecting mesh. Facility for precipitation comprises support structure for at least one feeding device or distributor, which is installed under above mentioned collecting mesh. Facility for precipitation is equipped with at least one inlet opening, which is connected to channel for feeding of protective elements, and at least one supply opening inverted to collecting surface of collecting mesh. Facility for precipitation comprises at least one diffuser, which is connected at the outlet to each supply channel and at the inlet to tank for storage of aqueous solution with protective elements. Facilities are equipped for control of solution pressure inside diffuser for monitoring of solution flow rate at the outlet of supply openings.

EFFECT: invention provides for monitoring of width, density and area of protective elements location.

10 cl, 9 dwg

FIELD: textile, paper.

SUBSTANCE: method relates to paper or cardboard production and can be used on pulp-and-paper industry. Part of paper pulp fiber is treated with a polymer at least within two stages. Paper pulp treated with the polymer is mixed with remaining non-treated paper pulp. The mixed paper pulp is dehydrated on a net conveyor for forming fibrous web.

EFFECT: increase of strength without negative effect upon paper or cardboard volume with decreasing quantity of adding polymers and enhancing economical efficiency of the process.

14 cl, 4 dwg, 2 ex

FIELD: textile; paper.

SUBSTANCE: method relates to production paper material and can be applied in paper-and-pulp industry when producing paper material with low-density. Method includes formation of aqueous suspension containing pulp. Addition of latex with agglomerated hollow particles in suspension. Formation of a wet sheet from the suspension and drying of the sheet. It also relates to paper material prepared by using the method.

EFFECT: production of paper material having good combination of optical, mechanical, tactile properties, evenness and volume including economical efficiency of the process.

10 cl, 6 dwg, 2 ex

FIELD: textile; paper.

SUBSTANCE: method (in version) concerns paper manufacturing and can be applied in pulp and paper industry. Method involves: (i) supply of water suspension containing pulp fiber, (ii) adding to suspension after the last point of severe shear force exposure of: (a) first anion component of anion organic polymer soluble in water; (b) second anion component of anion organic polymer dispersed in water or branched organic polymer; and (c) third anion component of anion material containing silicon; and (iii) dehydration of obtained suspension to produce paper. Also invention concerns composition (in version) including first, second and third anion components, and application of the composition as flocculation agent in production of pulp mass and paper for water treatment.

EFFECT: improved water drainage and retaining during paper manufacturing out of any type of pulp suspensions, accelerated operation of paper-making machine, reduced polymer dosage applied.

56 cl, 3 tbl, 4 ex

FIELD: textile, paper.

SUBSTANCE: method includes dissolution of cellulose and its grinding down to specified extent of grinding. Preparation of the first dispersion with application of return water, containing fibres of microcrystal cellulose, produced by its grinding in mixture with titanium dioxide and calcium hydroxide in specified amount. The second dispersion is prepared from cellulose fibres with application of return water. Then the first suspension is mixed with the second, and produced mixture is treated with carbon dioxide. In case of this treatment calcium hydroxide under action of carbon dioxide results in production of chemically deposited chalk and production of paper mass at specified ratio of components. Grinding of microcrystalline cellulose in mixture with titanium dioxide and calcium hydroxide is carried out in vibration mill with provision of impact and wear effect at mixture.

EFFECT: increased extent of fillers retention in paper, improvement of its printing properties, provision of possibility to vary bulk and porosity of paper, provision of possibility to use fully closed cycle of return water.

1 tbl, 8 ex

FIELD: construction.

SUBSTANCE: ground contains cation water-fast additive, alkaline glueing agent and anion activator in specified amount. Anion activator it contains is a component selected from group, including polyacrylate, sulfonate, carboxymethylcellulose and galactomannan hemicellulose. Ground paper has pH from approximately 7.0 to approximately 10, and strength of internal link from approximately 25 to approximately 350 millifeet per pound per square inch. This ground paper is produced by contact of a certain amount of cellulose fibres with water-fast additive, alkaline gluing agent and anion activator, serially and/or simultaneously.

EFFECT: improved physical properties of ground paper and expanded assortment of paper tapes to cover joints.

22 cl, 1 dwg, 1 ex

FIELD: chemistry.

SUBSTANCE: napkin article with density of over 3 cm3/g includes a napkin made from cellulose fibre and an additive composition on the first side of the napkin which contains a non-fibrous olefin polymer, an ethylene-carboxylic acid copolymer or mixture thereof. The napkin article is made using a method which involves preparation of an aqueous suspension of cellulose fibre, forming a napkin from the aqueous suspension of fibre and drying the napkin. The additive composition is deposited on dry fibres before preparation of the aqueous suspension of fibre, and is added to the aqueous suspension of fibre or for formation of the napkin. The additive composition contains a non-fibrous olefin polymer, an ethylene-carboxylic acid copolymer or mixture thereof and a dispersing agent.

EFFECT: high strength of the napkin without considerable negative effect on softness.

28 cl, 26 dwg, 6 tbl, 3 ex

FIELD: chemistry.

SUBSTANCE: aqueous dispersion contains A) 0.05-10 wt % salts of perfluoropolyester derivatives of dicarboxylic acids of formula T-O-Rt-T, where T = -CF2-COOZ or -CF2CF2-COOZ, Z - Na, K, NH4, R1(R2)(R3)N, R1=R2=alkyl or hydroxyalkyl, R3 = H, alkyl or hydroxyalkyl, Rf denotes (per)fluoropolyoxyalkylene chain with number-average molecular weight of 500-10000, and B) 0.01-5 wt % water-dispersible or water-soluble cationogenic polymers with charge density in dry polymer greater than 1 mEq/g. The dispersion is obtained by dispersing 0.05-10 wt % component (A) in water. Cationogenic polymer (B) is slowly added to the obtained dispersion while stirring until achieving weight ratio of (A) to (B) of 1:1-5:1.

EFFECT: dispersions which endow paper with improved oil-repellent properties against compounds with high content of fat or fatty acids.

14 cl, 16 tbl, 17 ex

FIELD: paper industry.

SUBSTANCE: methods refer to manufacturing of bleached cellulose material, prevention of yellowing and loss of whiteness in bleached craft-cellulose, and manufacturing of paper goods. In process of bleached cellulose material manufacturing, bleached craft-cellulose is produced and exposed to contact with sufficient amount of more or several reducing agents. Additionally bleached craft-cellulose is exposed to contact with one or several optical bleach, with one or more chelating agent. Method for prevention of yellowing and loss of whiteness of bleached craft-cellulose in storage includes addition of efficient amount of one or more reducing agent into bleached cellulose and possibly one or more chelating agent, one or more polycarboxylate or their combinations. Method for production of paper goods includes production of bleached craft-cellulose, formation of initial water suspension from it, water drainage with formation of sheet and sheet drying. Besides efficient amount of one or more reducing agent is added into bleached craft-cellulose, initial suspension or sheet. Additionally one or more chelating agent is added there, one or more optical bleach, one or more polycarboxylate, or their combination.

EFFECT: improved quality of paper goods, increased stabilisation of whiteness and increased resistance to yellowing in process of paper production and to thermal yellowing, improved colour pattern.

17 cl, 33 tbl

Paper making method // 2384661

FIELD: textile, paper.

SUBSTANCE: method relates to paper production and can be used in pulp-and-paper industry. Method involves the use of cellulose suspension from cellulose fibres and fillers (optional), dehydration of cellulose suspension on grid or sieve so that a sheet can be formed. Then the sheet is dried. In this method there used is polymeric addition which includes ethylenically unsaturated monomer soluble in water or potentially soluble in water, and ethylenically unsaturated monomer containing a reactive group. The latter represents an epoxy group. The polymeric addition used has molar weight which is less than one million. Polymer is obtained from mixture of monomers, which includes acrylamide and glycidyl methacrylate. Thus, the obtained polymer is used as an addition for increase of paper durability in dry condition, in wet condition, as reagent for internal paper sizing and for surface sizing.

EFFECT: increasing paper durability.

17 cl, 2 tbl, 3 ex

FIELD: medicine.

SUBSTANCE: absorbing cloth from a cellulose fiber contains an admixture of hard wood and soft wood fibers located in the form of mesh structure, including: the set of columnar areas fibers conglomeration with relatively high local density, aggregated by means of set of the connecting areas with lower local density, where orientation of fibers is inclined along a longitudinal direction between the columnar areas interconnected in a such way, where the cloth possesses coefficient of elongation in a cross-section direction, which is at least in 2.75 times higher than relative strength at cloth stretching in a dry condition. The above-stated material is obtained as follows. A water cellulose composition from hard wood fibers is prepared. The composition is moved on a forming tissue in the form of a stream which is let out from a pressure head box with a flow rate. The composition is dehydrated and compacted for manufacturing of a paper for formation of the fibrous layer possessing chaotic distribution of a fiber for paper manufacturing. Packing of the dehydrated fibrous layer possessing chaotic distribution of a fiber on the transporting transferring surface moving with the first rate. Creping of a fibrous layer from the transferring surface on a tape at dryness from 30% to 60% with use of the pattern creping tape. The creping stage is carried out under pressure in a contact zone of the creping tape confined between the transferring surface and the creping tape. Thus the tape is moved with the second speed, lower than speed of the transferring surface. Tape drawing, parametres of a contact zone, speed difference and dryness of the fibrous layer are chosen in such way to crepe the fibrous layer at its removal from the transferring surface and to redistribute on the creping tape with formation of a fibrous layer with mesh structure. Drying of the fibrous layer is performed after. The process is regulated so that coefficient of elongation in a cross-section direction is, at least, approximately in 2.75 times higher than relative strength at stretching of the fibrous layer in a dry condition. Such method allows obtaining a cellulose fibrous layer for products made from thin paper, and also products in the form of towels.

EFFECT: improvement of ready product quality and power consumption decrease.

33 cl, 10 dwg, 22 tbl

FIELD: textile; paper.

SUBSTANCE: method consists of adding to the paper sheets approximately 0.05 pounds/ton to 15 pounds/ton, in accordance with the dry fibers, one or several polymers, functioning as aldehyde, containing amino or amido group, where, at least, 15 molar percent amino or amido group function with one or several aldehydes and where the functionaling aldehyde polymers have a molecular weight of not less than approximately 100000.

EFFECT: increased activity for drying due to a reduction in the amount of polymer.

14 cl, 5 ex

Paper filler // 2345189

FIELD: textile, paper.

SUBSTANCE: filler is designed for paper making and can be used in pulp-and-paper industry. Filler contains calcium salt and cellulose derivative with lattice ionic fractional substitutionality up to approximately 0.65, where filler is essentially free from either cellulose fibre or fibrils or lignocellulose. Filler contains calcium salt and cellulose derivative with lattice ionic fractional substitutionality up to approximately 0.65, where cellulose derivative can contain cationic groups. Besides the invention refers to production process of filler involving mixing the agent substance containing calcium salt and cellulose derivative with lattice ionic fractional substitutionality up to approximately 0.65, essentially without cellulose fibre or fibrils or lignocellulose. Other production process of filler consists in mixing the agent substance containing calcium salt and cellulose derivative with lattice ionic fractional substitutionality up to approximately 0.65, where cellulose derivative contains cationic groups. The invention refers to method for making paper including preparation of aqueous suspension containing cellulose fibre, suspension addition with filler containing calcium salt and cellulose derivative with lattice ionic fractional substitutionality up to approximately 0.65, where filler is essentially free from either cellulose fibre or fibrils or lignocellulose; dehydration of suspension thus making web or paper sheet. The invention also refers to method for making paper including preparation of aqueous suspension containing cellulose fibre; suspension addition with filler containing calcium salt and cellulose derivative with lattice ionic fractional substitutionality up to approximately 0.65, where cellulose derivative contains cationic groups; dehydration of suspension thus making web or paper sheet.

EFFECT: higher sizing efficiency with good drainage, retention and serviceability of papermaking machine.

24 cl, 3 tbl, 4 ex

FIELD: cardboard for packaging of liquid foods.

SUBSTANCE: cardboard has one of layers containing additives of metal salt, metal oxide or enzymes for decomposing of disinfecting composition, in particular, hydrogen peroxide, or reacting therewith for obtaining of gas serving as barrier for penetration of the given disinfecting composition through edges into cardboard.

EFFECT: increased efficiency in protecting of cardboard from penetration of disinfecting composition into cardboard and, accordingly, into liquid food.

8 cl, 1 tbl, 1 dwg, 1 ex

FIELD: textile, paper.

SUBSTANCE: method of filler treatment includes formation of a mixture of an aqueous suspension of filler and aqueous anion latex. The latter is a dispersion of acrylic polymer with vitrification temperature (T v) from - 3 to 50°C. This mix is mixed with water at the temperature that is higher than T v of latex, at the same time the specified water has temperature of 40-98°C. The specified suspension of the filler comprises a solid disperse filler selected from the group containing kaolin clay, ground calcium carbonate, deposited calcium carbonate, deposited calcium sulfate, talc and mix of two or more of them. The specified acrylic polymer is selected from the group containing copolymers n-butylacrylate-acrylonitrile-sterol and copolymers n-butylacrylate-sterol. The aqueous composition of the filler contains the solid dispersed filler specified above with solid particles of anion latex polymer specified above and adsorbed on them, in aqueous carrier. The treated filler contains the solid dispersed filler specified above with solid particles of anion latex polymer specified above and adsorbed on them. The pulp charge contains pulp fibres and the solid dispersed filler specified above with solid particles of anion latex polymer specified above and adsorbed on it, in aqueous carrier. Method to make paper from the above specified pulp charge containing pulp fibres. The paper product made of pulp fibres and solid disperse filler, where the specified filler has solid particles of anion latex polymer specified above absorbed on it, with size of solid polymer particles of 30-200 nm and in amount of 1-100 kg of latex per 1 t of filler relative to dry mass of solid substances of latex and filler, and the specified filler has average size of particles of 0.1-30 mcm.

EFFECT: improved retention of the filler, continuous execution of the filler treatment method to improve fixation of anion latex on the filler for a short period of time due to irreversible fixation of anion latexes on particles of the filler and time stability of aggregated filler suspension, latex-treated deposited calcium carbonate is more acid-resistant, and when used to make paper from wood mass under neutral conditions less acid is required to control pH.

21 cl, 14 dwg, 8 ex

Up!