The way to obtain sized paper, paper board, cardboard and similar products of cellulose fibers and water dispersion of a sizing agent

 

(57) Abstract:

Usage: to obtain sized paper and similar products of cellulose fibres, containing as filler is precipitated calcium carbonate. The inventive aqueous suspension of the pulp is dewatered and dried in the presence of aqueous dispersions of rosin sizing agent, which contains a component of rosin and component ester of rosin, water dispersion of cellulose-reactive sizing agent. The invention also relates to aqueous dispersions of sizing substances, which contains a rosin sizing agent component consisting of rosin and component ester of rosin, and pulp-reactive sizing agent. 2 C. and 15 C. p. F.-ly, 4 PL.

The invention relates to a method of producing sized paper and similar products of cellulose, containing as filler precipitated calcium carbonate, and aqueous dispersions of sizing agents.

Precipitated calcium carbonate (PCC) is widely used as filler in alkaline paper due to its low cost and ability to give a paper opacity, whiteness and bulk. eniah pH, provides the ability to get the paper with filler PCC with internal sizing. Widely used for this purpose sizing agents are generalelection (AAA) and alchemistry anhydride (ASA). These sizing agents react with hydroxyl groups of cellulose, and often they provide high initial sizing ability when used in small quantities. However, in recent years empirically shown that sizing ability, originally received from the AAA or ASA, is not saved in time. This phenomenon is called reversion sizing, i.e., glued the paper is within the technical conditions in the roll, but in the process of aging sizing capacity decreases to a certain level and then remains constant. In addition, there are examples, like when watching a complete loss of sizing in time, what has been called the volatility. A practical consequence of the reversion and volatility in the paper sizing using as filler PCC are low economic performance and problems that occur during processing and end use.

In order to counteract the reversion sizing, the manufacturer of the securities of the fining agent. Although often the result is a slow deterioration sizing, elevated levels used sizing agent cause problems during processing and end use. For example, elevated levels of AAA lead to problems of slippage and low adhesion toner (coloring agent). When processing certain types of thin paper, for example, Forms Bond, envelope, tapes, computers, and some types of paper cut into sheets of stationery format required precise control at high speeds. Here the slip of paper results in, for example, the clash of wrinkles, offset perforation and reduced speed pressing.

In previous work in this area is well known the use of dispersions of rosin for internal sizing or sizing fibrous mass. Rosin is mixed with cellulose fibers deposition with aluminum compounds. However, in order to be effective, bonding with dispersions of rosin should be performed at acidic pH values between 4 and 6. When the fibrous mass has a neutral or alkaline pH values, sizing with rosin becomes unstable and very difficult to control. In addition toklaipeda system and adversely affect the efficiency of the sizing. Thus, exposure to alkaline conditions and calcium carbonate on the chemistry of aluminum and rosin is up to the present time both economically and technically adverse to apply rosin dispersions upon receipt paper, including PCC as filler.

A method of obtaining sized paper comprising adding to the suspension of cellulosic fibrous mass of precipitated calcium carbonate and aqueous dispersion of pulp and reactive sizing agent dimer of ketene or anhydride of carboxylic acid, followed by dehydration and drying of the paper web [1]

Also known aqueous dispersion of a sizing agent containing a rosin sizing agent based on rosin and pulp-reactive sizing agent based on dimer of ketene at a ratio respectively of 0.1-10:1 [2]

These shortcomings apply to the data objects.

The task of the invention to develop the method of sizing, which reduces or eliminates problems caused by reversion of sizing and fragility sized paper and similar cellulosic products containing precipitated calcium carbonate as filler. ri implementation sizing according to the method of the invention.

This task is solved in that in a method of producing sized paper, paper Board, cardboard and similar products of cellulose fibers, comprising the addition of an aqueous dispersion of pulp and reactive sizing agent to the aqueous suspension of pulp containing as filler precipitated calcium carbonate, dehydration and drying pulp, according to the invention to the suspension add the aqueous dispersion of the sizing agent on the basis of a rosin containing a rosin component and 5-75 wt. a sizing agent based on rosin, component ester of rosin, and the mass ratio of the sizing agent on the basis of rosin to pulp-reactive sizing agent is from 1:1 to 20:1.

Rosin component selected from rosin, disproportionating rosin, gidrirovannoe rosin, rosin treated with formaldehyde, condensation of rosin and mixtures thereof.

Component ester of rosin is the ester of rosin alcohol chosen from mono-, di - and polyhydric alcohols and mixtures thereof.

Pulp-reactive sizing agent is a dimer of ketene or acid anhydride, or with the service sizing agent is from 3:1 to 10:1.

A sizing agent is used in the form of an aqueous anionic dispersions.

A sizing agent present in the aqueous cationic dispersions.

A sizing agent is used in the form of an aqueous dispersion comprising dispersed particles, which contain a mixture of sizing agent on the basis of rosin and pulp-reactive sizing agent.

Water suspension of pulp contains precipitated calcium carbonate in an amount up to 35 wt. calculated as the dry weight of dry pulp fiber.

This task is solved in that a water dispersion of a sizing agent containing a sizing agent based on rosin and pulp-reactive sizing agent according to the invention, a sizing agent based on rosin contains a rosin component and from 5 to 75 wt. a sizing agent based on rosin, a component of the cellulose ether, and the mass ratio of the sizing agent on the basis of rosin to pulp-reactive sizing agent is from 1:1 to 20:1.

Components of rosin selected from the group consisting of rosin, disproportionating rosin, gidrirovaniem ester of rosin is an ester of rosin alcohol, selected from mono-, di - and polyhydric alcohols and mixtures thereof.

Pulp-reactive sizing agent is a dimer of ketene or acid anhydride or mixtures thereof.

The mass ratio of the sizing agent on the basis of rosin to pulp-reactive sizing agent is from 3:1 to 10:1.

The dispersion contains dispersed particles comprising a mixture of a sizing agent based on rosin and pulp-reactive sizing agent.

Aqueous dispersion contains at least one anionic dispersing agent.

Aqueous dispersion contains at least one cationic dispersing agent.

According to the invention found that it is possible to solve problems and to limit the reversion and volatility sizing in the PCC-containing coated paper by performing sizing by rosin sizing agent containing the component of the rosin component and the ester of rosin, in combination with a pulp-reactive sizing agent. According to the invention it is possible not only to provide a very good initial sizing ability, but you can also save a sizing pagesno invention also detected, what initially good sizing capability can be further improved by storing the received paper. The beneficial effect of the use of a sizing agent based on rosin in combination with pulp-reactive sizing agent is unexpected, as previous work in this area is well known that rosin dispersions preferably used for sizing in acidic conditions, but not in alkaline, in particular not for alkaline sizing, when calcium carbonate, PCC especially, is contained in the paper pulp as a filler.

Upon receipt paper uses different types of powdered calcium carbonates such as chalk, clay, limestone and precipitated calcium carbonate. Then as chalk and other soil carbonates are obtained by mechanical processing such as crushing and grinding naturally available materials, precipitated calcium carbonate is a material obtained synthetic chemical deposition method, usually by way of carbonization, in which the calcium hydroxide is converted to calcium carbonate by reaction with carbon dioxide. Reaction conditions determine the resulting type of crystals, the size of the available precipitated calcium carbonates are of a small particle size, a more narrow distribution of particle size and higher specific surface area.

In previous work it is known that the smaller particle size and higher specific surface creates an additional difficulty for sizing, thus making PCC-containing suspension of the cellulose more complicated for sizing than the slurry containing soil carbonates. In addition, it is shown that PCC fillers give a higher pH value than the fillers of other carbonates of calcium in the fibrous mass, and in the resulting paper. While the problems associated with the reversion and volatility sizing, noted when using PCC fillers, in particular arabnetconference PCC, they do not see when using other alkaline mineral fillers.

According to the invention the fibrous mass may contain PCC in any one or a mixture of different crystalline forms or structures that exist, including calcite rhombohedral, prismatic, tabular, pryamougolnichkami and arabnetconference forms and aragonite needle shape. Preferably used arabnetconference and rhombohedral PCC. PCC is ome 2 to about 20 m2/,

Dehydrated and dried fibrous mass according to the invention may contain PCC in the amount of up to about 35 wt. mostly from 5 to 30 wt. more preferably from 10 to 25 wt. which is calculated as the dry weight of dry pulp fiber. In addition to the PCC fibrous mass may contain additional fillers, such as plain known in this field, including, for example, chalk, limestone, ground calcium carbonate, kaolin (China clay), talc, dvuoksid titanium, bentonite, wollastonite, glass fiber, stretched perlite, etc. and the total number of fillers contained in the fibrous mass may be up to about 35 wt. mostly from 5 to 30 wt. which is calculated as the dry weight of dry pulp fiber. The use of PCC as a filler according to the invention can provide the fiber with a pH value ranging from about 7 to about 10, in particular between 7,5 and 9,0.

According to the method of the invention to the fibrous mass may be added to the water dispersion of a sizing agent. For convenience and simplicity, the invention will be described on the example of this variance, assuming that the characteristics of the dispersion also saw relates to a water dispersion of a sizing agent, moreover, the dispersion includes rosin sizing agent, which contains a component of rosin and component ester of rosin, and pulp-reactive sizing agent.

Used herein, the term "rosin" refers to the rosin, which can be obtained from conventional rosins, for example, gum rosin, rosin from tall oil, the extraction of rosin or mixtures thereof, in crude or purified form. Component of rosin present in the sizing agents based on rosin, may be chosen from rosin, modified rosin, refined (condensation) of rosin and mixtures thereof. The modified rosin is a rosin that is modified in a known manner, such as, for example, gidrirovanny rosin, polymerized rosin, rosin treated with formaldehyde and so on, it is Preferable that component of rosin was rosin condensation, i.e. the product of the merger by the Diels-alder reaction, obtained in a known manner, by the reaction between rosin, optionally modified as shown previously, and , -unsaturated carbonyl compound, for example, maleic acid, fumaric acid, taconova acid, tarakanovas condensational rosin may be, of course, obtained from a mixture of a, -unsaturated carbonyl compounds, for example, those described earlier, and can also be used mixtures of different condensation of rosins. Condensation rosin typically contains up to 15 wt. attached a,b-unsaturated carbonyl compounds, mainly from 3 to 12 wt. the total weight of the condensation of rosin.

Component quantity of rosin present in the sizing substance based on the rosin is preferably from about 25 to about 95 wt. of the total weight of sizing agent on the basis of rosin. Preferably component of rosin is present in an amount of from about 35 to 90 wt. more preferably from about 45 to about 85 wt. from the total amount of sizing agent on the basis of rosin.

A special characteristic of the invention is that rosin sizing substance contains a component ester of rosin. Component ester of rosin may be an ester of rosin alcohol chosen from mono-, di - and polyhydric alcohols and mixtures thereof. Ester of rosin can be obtained from a conventional method of esterification of rosin, optionally modified as above, with mono-, di - or magoar, in U.S. patent N 4842691. Mono-, di - and polyhydric alcohols are predominantly up to 30 carbon atoms. As examples of suitable monoatomic alcohols can specify cyclic alkalemia alcohols, alkalemia alcohols with straight and branched carbon chain having from 5 to 25 carbon atoms, preferably hydrophobic alkalemia alcohols with a long hydrocarbon chain. Specific examples are oktilovom, decroly, dodecyloxy, tetradecanoyl, hexadecanoyl, octadecanoyl, ansilove and jocosely alcohols. Preferably use rosin esters derived from alcohols selected from di - and polyhydric alcohols, such as three - and tetratomidae alcohols. Such alcohols can be selected from glycols, such as ethylene glycol, diethylene glycol, triethylene glycol and polyethylene glycol, triethyleneglycol, glycerin, digitally alcohol, trimethylacetyl, trimethylolpropane, pentaerythritol, dipentaerythritol; aminoalcohols, such as triethanolamine, Tripropylamine, triisopropanolamine and mixtures thereof. Component ester of rosin may contain ether refined rosin, and the etherification can be carried out until the reaction accession, and after it.

Component ether karernyh acids and alcohols, selected from mono-, di - and polyhydric alcohols listed above. Mainly fatty acid contains more than eight carbon atoms and may be any of the organic acids, as defined below. The increasing number of ether fatty acids are predominantly less than 50 wt. preferably from 10 to 30 wt. the weight component of the ester of rosin.

Component ester of rosin may contain a mixed ester of rosin and fatty acids with an alcohol selected from di - and polyhydric alcohols, such as defined previously. Suitable fatty acids are the acids mentioned above. Mixed esters can be obtained by the joint reaction of rosin and fatty acids with alcohol in the usual manner. Mixed ester may contain rosin and fatty acid in any proportion, mainly the content of the rosin is from 25 to 75 wt. the amount of rosin and fatty acid mixed ester.

Component quantity ester of rosin present in the sizing agent based on rosin, may be from 5 to 75 wt. by the total number of the rosin sizing agent. Preferably the ester of rosin is present in an amount of from 10 to 65 wt. and more preferably from 15 to 55 wt.leivasy agent according to the invention may be pulp-reactive sizing agent, selected from the group consisting of diketene, acid anhydrides, organic isocyanates, carbamylcholine and mixtures thereof, preferably dimers of diketene and anhydrides of the acids. Any of the well-known pulp-reactive sizing agents can be used. Suitable diketene have the formula

< / BR>
in which R1and R2represent a hydrocarbon group, typically alkyl having at least eight carbon atoms, aryl, aralkyl and alkaryl. Examples of suitable ketene dimers include octyl, decyl, dodecyl, tetradecyl, hexadecyl, octadecyl, eicosyl, docosyl, tetracosyl, phenyl, benzyl, naphthyl and cyclohexyldiamine, diketene, obtained by known methods from organic acids, such as montanosa acid, naphthenic acid,9,10-dellanave acid,9,10-dolezelova acid, palmitoleic acid, oleic acid, racinaea acid, linoleic acid and aleocharinae acid, and natural mixtures of fatty acids such as those found in coconut oil, palm kernel oil, palm oil, olive oil, peanut oil, rape oil, beef fat, melted pork fat and whale blubber. Can also be used a mixture of any the formula

< / BR>
in which R1and R2may be the same or different and represent an unsaturated or saturated hydrocarbon group containing from 8 to 36 carbon atoms, the group can be straight or branched alkilani, aracelli or altarelli, or R1and R2together with-C-O-C-part to form a 5 - to 6-membered ring which can be substituted by alkyl, alkenyl, aralkyl or almariam. Examples of suitable acid anhydrides are the anhydrides tetradecanoic acid, palmitic acid, oleic acid, and stearolic acid, anhydrides substituted succinic acids such as anhydrides isooctadecyl, n-hexadecyl, dodecyl, decenyl and oktaviantrie acid, and anhydrides substituted glutaric acid such as the anhydride heptylphenol acid.

Examples of suitable carbamoylation include carbamylcholine described in U.S. patent N 3887427.

The ratio by weight of sizing agent on the basis of rosin to pulp-reactive sizing agent may be in a range from 1:1 to 20: 1, mainly from 2:1 to 15:1 and preferably from 3:1 to 10:1. Most preferably, the ratio by weight of from 4:1 to 7:1.

According to the invention, the dispersion can be obtained by using one or more dispersing agents selected from the group of anionic and cationic dispersing agents. Preferably, the dispersion was anionic. The amount of dispersing agent should be sufficient to give a dispersion of the desired charge and stability during storage and should normally be at least 2 wt. the amount of sizing agents. Usually rarely necessary to use more than 5 wt.

Requirements for dispersing substances are that they give the desired total charge and that they do not impact negatively on the sizing effect of the dispersions. Dispersing agents can be any of the commonly used dispersing agents when getting water on the derivatives of rosin, of alkyl sulphates, alkylarylsulfonates, alkyl sulphonates, alkylarylsulphonates and so on, Especially suitable anionic dispersing agents are alkylsulfonate and alkyl sulphates, for example sodium lauryl sulphate. Cationic dispersing agents can be, for example, nitrogen-containing dispersing agents such as Quaternary ammonium compounds, salts of tertiary amines, nationalease starches, water-soluble alkylenediamine (epichlorhydrine resin, poly(diallylamine)), epichlorhydrine resin and so on, Especially suitable cationic dispersing agents are Quaternary ammonium compounds. This dispersion may also contain a protective colloid, such as any of the known previous works, for example, polyvinyl alcohol, nationalease starch, casein, and cellulose derivatives. In order to obtain a more stable dispersion can also be successfully include non-ionic and amphoteric surfactants.

According to the invention, the dispersion may contain dispersed particles sizing agent based on rosin and dispersed particles of pulp and reactive sizing agent or disperse castigo agent, or a combination of the above dispersed particles. A dispersion containing discrete particles of a sizing agent based on rosin and pulp-reactive sizing agent can be obtained by pre-mixing the resulting dispersion of the sizing agent on the basis of rosin with a pre-prepared dispersion of pulp and reactive sizing agent. According to the invention such dispersion is preferably obtained by mixing or pre-cooked anionic sizing dispersions, or pre-cooked cationic sizing dispersion. However, they can also be obtained by blending pre-cooked sizing dispersions of opposite charge until the resulting dispersion of the invention shows the required charge and stability store.

Water dispersion of a sizing substances on the basis of rosin are commercially available and can be obtained by themselves in the usual way, for example, the homogenization of the active substance in water in the presence of a dispersing agent using high shear forces and high temperatures in order to obtain disperse, is a component of the rosin component ester of rosin or preferably their homogeneous mixture. Homogeneous mixture preferably receive intensive mixing of the molten rosin component and the component ester of rosin. However, it is also possible to obtain a homogeneous mixture based on the solutions of the corresponding components in the solvent. The active substance is dispersed in water in the presence of the dispersing agent with satisfactory mixing, for example, when using a static mixer or device Ultra Turrax. The heated dispersion of the sizing agent on the basis of the rosin can be obtained by way of reciprocity, i.e., an aqueous solution of dispersing agent is added to the molten active substance mainly a mixture of component a rosin component and ether resin with continuous mixing of the emulsion water in oil. Then, with vigorous stirring, add hot water up until the emulsion is converted into an emulsion oil in water, which is cooled and receive variance based on rosin. The dispersion of the rosin sizing agent can be obtained also by mixing the previously prepared dispersion of the components is version or emulsion of pulp and reactive agents known from previous works and commercially available, such dispersions can be prepared in and of themselves in the usual way, for example, by mixing pulp-reactive sizing agent with the aqueous solution of dispersing agent or emulsifier, followed by gomogenizirovannom mixture. Additional methods of obtaining aqueous dispersions pulp-reactive sizing agents, as well as dispersions of rosin sizing agents will be evaluated by specialists working in this field.

According to the invention, the dispersion may contain dispersed particles comprising a mixture of rosin sizing agents and pulp-reactive sizing agents. A method of obtaining such dispersions of rosin and pulp-reactive sizing agent is described in U.S. patent N 4743303. This dispersion can be obtained in this way, but it is modified so that the rosin sizing agent component contains ester of rosin.

This dispersion is particularly suitable for sizing paper, paper cardboard, cardboard and similar products of cellulose fibers containing as filler is precipitated calcium carbonate. The dispersion can be used

According to the invention the dispersion of the sizing substances is added mainly in the fiber, i.e., in aqueous suspension of paper pulp, in the usual way, with this variance can of course be applied chemical additives commonly used to get the paper, such as binders, aluminum compounds, resins, providing blagorodnost etc., Examples of aluminum compounds include aluminum alum and semi-aluminum compounds such as polyaluminium chlorides and sulfates. Chemical additives used in the manufacture of paper, such as binders, can, if necessary, also be included in the current variance. The dispersion can be used in an amount corresponding to 0.01-5.0 wt. sizing agents, calculated as dry product on dry cellulosic fibers, mainly in an amount corresponding to 0.025 to 1.0 wt. sizing agents.

Precipitated calcium carbonate is added to the aqueous suspension of paper pulp is predominantly in the usual way. It can be made to the sizing dispersion of substances, after or simultaneously with the addition of dispersion.

The sizing dispersion of substances can be added to fiber is bretania there is no need to obtain dispersion in advance but dispersion can be prepared in situ. Thus, the previously prepared dispersion of rosin sizing agent and pre-prepared dispersion of pulp and reactive sizing agent or part thereof may be separately added to the fibrous mass at the same or at different times, followed by mixing the dispersion with a fibrous mass before dewatering and drying of the fibrous mass. Separate add pre-cooked dispersions may be useful if the pulp-reactive sizing agent is an acid anhydride. Typically, the anhydrides of the acids are not stable under the hydrolysis and their dispersion or emulsion usually get on paper factory directly before adding to the fibrous mass. Thus, separate addition of sizing agents may be technically advantageous.

The invention is illustrated by the following examples, which, however, do not limit the invention (parts and are indicated as parts by weight and wt. accordingly, unless explicitly).

Example 1. Anionic dispersion of rosin sizing agent containing 20 wt. component epipodophyllotoxins condensation with maleic anhydride, stirred at 150-170oC 20 h ether of glycerol rosin obtained from 12 o'clock of glycerin and 100 hours of rosin. The resultant mixture of rosin-modified condensation, and ester of rosin reacts with aqueous potassium hydroxide to neutralize approximately 5% of the available acidity, then cooled with water to 100-103oC, and then quickly add aqueous anionic dispersion of casein before formation of viscous emulsions of oil in water. The reaction was stirred intensively for 5 minutes, diluted slowly with water at 80oC and quickly with cold water. Finally, add limited and the emulsion is rapidly cooled to a temperature below 30oC. the Final dispersion has an average particle size of less than 0.5 μm and a total solids content of 40%

Example 2. Anionic dispersion of a sizing substances according to the invention are obtained when mixing the anionic dispersion of a rosin sizing agent of example 1 with previously obtained by anionic dispersion of diketene. Keydime ATMfrom Eka Nobel Inc. USA, in amounts corresponding to a mass ratio of 5:1 rosin sizing agent to the pulp-reactive sizing agent. The content of the component ester of rosin is 20 wt is cleevely substances according to the invention is evaluated and compared with the data for the reference AKD and rosin dispersion, from which they are derived.

Anionic dispersions are used to obtain internally sized paper with PCC filler on the pilot paper machine. Paper made from 60: 40 slurry by mixing the bleached Kraft pulp of hardwood and softwood (wood wet weight), grinding 400 Canadian Standard and the formation of a canvas with a mass of 1 m280 g at a pH of head part of 7.6 to 8.2. The leaves are dried up to 4.5-5.0% moisture at the reel.

Precipitated calcium carbonate is added in the amount of 12 wt. calculated as the dry product on dry pulp fibers. The white water system is closed, fresh water is fed through the viscous fibrous mass from the bottom and inject. Each experience lasts at least 12 to 15 minutes, allowing the white water system to establish equilibrium.

Each dispersion is added to the viscous fibrous mass right before dilution at the fan pump. PCC is added at the input side of the pump. Besides, enter the following chemical additives in amounts expressed on a dry fiber cellulose: polyaluminium chloride, EkoflockTMfrom Eka Nobel Inc. USA, 10,0 kg/t added simultaneously with dispersion and 0.5 kg/t to the pallet (only when AAA-dispersion used); seniorchoicesca silicasol, 6 kg/t nationalease starch is added to the viscous fibrous mass right before dilution at the pump and 1 kg/t of silicasol added to dilute fibrous mass.

Canvas paper with RRC-filler is tested when using the Hercules Sizing Test (HST) with the test solution N 2 (1% formic acid) to 80% reflectivity. Samples of cloth taken from the machine in a roll and after 1 week of storage under conditions of natural aging at room temperature and 50% relative humidity. The results are summarized below in table. 1. Level sizing is reflected by the level of sizing agent in the Mas. on the dry pulp fiber.

As can be seen from the table. 1, the dispersion of example 2 of the invention do not show signs of reversion sizing, but a noticeable improvement high initial sizing ability receive after 1 week of aging. Sizing ability, obtained by dispersion of the present invention was higher than sizing the capacity obtained with the reference dispersion, which dispersion of the invention prepared.

Example 4. Sizing the capacity of the water dispersion of a sizing agent of the invention is evaluated in a manner analogous to the Persia of example 2, with 0.6% sizing substances, add 15 kg/t EkoflockTM. Other additives and their number remain the same. The results are shown in table. 2.

As can be seen from the table. 2, the dispersion of example 2 of the invention gives an improved sizing at all levels of sizing. Sizing ability, obtained using combined sizing compounds of the invention was higher than expected from each component separately.

Example 5. In this example, aqueous anionic dispersion of a sizing agents with different ratio of component ester of rosin to a component of rosin is obtained by mixing previously prepared anionic dispersions of rosin sizing agent with the same as in example 2, pre-cooked anionic diketonato dispersion. The resulting dispersion contained 0, 20, 50 and 80 wt. glycerol ester of rosin on rosin sizing agent at a mass ratio of rosin sizing agent to alkyldimethyl 5:1.

The anionic dispersion of a rosin sizing agent obtained by the method of example 1, but using varying levels of glycerin ester of rosin to get tons of particles of 0.87 μm) and the content of dry solids to about 40 wt.

Example 6. Aqueous cationic dispersion of a sizing agent with the changing ratio of the component ester of rosin to a component of rosin is obtained by mixing pre-cooked cationic dispersions of rosin sizing agent with prior cationic dispersion of diketene, Keydime ETMfrom Eka Nobel Inc. USA. Dispersion containing 0, 20, 50 and 80 wt. glycerol ester of rosin on rosin sizing agent and a mass ratio of rosin sizing agent to alkyldimethyl is 5:1.

Cationic dispersion of a rosin sizing agent obtained using the initial dissolving rosin sizing agent in an organic solvent, by stirring at 50oC the resulting solution with an aqueous solution epichlorhydrine resin. The crude dispersion is homogenized until then, until the resulting dispersion will have a particle size of about 0.5-0.6 μm, finally, the solvent is evaporated on a rotary evaporator. These cationic dispersion of the rosin sizing agent content of dry solids to about 19 wt. and the content of the rosin sizing agent about 17 wt.

2100 g is obtained from the same pulp and using the same chemical additives as in example 3. Casting is subjected to pressing to obtain a content of 50% humidity and dried at 80oC for 4 minutes

Chemical additives are added to the diluted fibrous mass at 0.5% viscosity. The sequence of addition and the amount of chemical compounds that are added, on a dry pulp fiber following (diluted fibrous mass at 0):

0,5% nationalease starch on the 10th;

2,0% (as adopted) polyaluminium chloride on the 20th;

0.25% of the anionic dispersion of a sizing agent on the 30th;

10,0% PCC 40;

0,7% (typical) of silicasol on the 50th;

the formation of the sheet in the 75th C.

Sizing ability is measured as in example 3. Testing is carried out on the leaves after 24 h of natural ageing and after one week of aging at a constant room temperature and 50% relative humidity. The results are given in table. 3 below. Ester of rosin (%) represents the amount in mass of the component ester of rosin present in rosin sizing agent.

In table. 3 clearly PI. A dispersion containing 20 and 50 wt. component ester of rosin, give higher initial sizing ability, higher sizing the ability to store and less reversion sizing.

Example 8. Sizing the ability of the aqueous cationic dispersions of example 6 evaluate in a manner analogous to example 7. Also a comparison with the cationic dispersion of AAA, from which the data dispersion obtained, they are added in an amount corresponding to the 0.09 and 0.1 wt. AAA, respectively, on a dry pulp fiber. Cationic dispersion combined sizing agents of the invention is used in an amount corresponding to 0.35 wt. combined sizing agents for cellulosic fiber. All other additives and the number of them making the same. The results are shown below in table. 4. RE (%) is an ester of rosin (%) as in example 7.

Dispersion of the invention containing 20 and 50 wt. component of rosin, show high initial sizing capacity sizing and high capacity storage.

1. The way to obtain sized paper, paper Board, cardboard and similar products of cellulose fibers, including on the heat mass, containing as filler precipitated calcium carbonate, dehydration and drying pulp, characterized in that the suspension is added to an aqueous dispersion of the sizing agent on the basis of a rosin containing a rosin component and 5 to 75% by weight of a sizing agent based on the rosin component ester of rosin, and the mass ratio of the sizing agent on the basis of rosin and cellulosecontaining sizing agent is from 1 to 1 to 20 to 1.

2. The method according to p. 1, wherein the rosin component is chosen from rosin, disproportionating rosin, gidrirovannoe rosin, rosin treated with formaldehyde, condensation of rosin and mixtures thereof.

3. The method according to p. 1, characterized in that component of the ester of rosin is the ester of rosin alcohol chosen from mono-, di - and polyhydric alcohols and mixtures thereof.

4. The method according to p. 1, characterized in that cellulosimicrobium sizing agent is a dimer of ketene, or acid anhydride, or mixtures thereof.

5. The method according to p. 1, characterized in that the mass ratio of the sizing agent on the basis of rosin and cellulosecontaining sizing technology in the form of an aqueous anionic dispersions.

7. The method according to p. 1, wherein the sizing agent present in the aqueous cationic dispersions.

8. The method according to p. 1, wherein the sizing agent is used in the form of an aqueous dispersion containing dispersed particles, which contain a mixture of sizing agent on the basis of rosin and cellulosecontaining sizing agent.

9. The method according to p. 1, characterized in that the aqueous suspension of pulp contains precipitated calcium carbonate in an amount up to 35 wt. calculated as the dry weight of dry pulp fiber.

10. Water dispersion of a sizing agent containing a sizing agent based on rosin and cellulosecontaining a sizing agent, wherein the sizing agent based on rosin contains a rosin component and 5 to 75% by weight of a sizing agent based on the rosin component of the cellulose ether, and the mass ratio of the sizing agent on the basis of rosin and cellulosecontaining sizing agent is from 1 to 1 to 20 to 1.

11. Dispersion under item 10, characterized in that the components of rosin selected from the group consisting of rosin, disproportion and mixtures thereof.

12. Dispersion under item 10, characterized in that the ester of rosin is an ester of rosin alcohol chosen from mono-, di - and polyhydric alcohols and mixtures thereof.

13. Dispersion under item 10, characterized in that cellulosecontaining sizing agent is a dimer of ketene, or acid anhydride, or mixtures thereof.

14. Dispersion under item 10, characterized in that the mass ratio of the sizing agent on the basis of rosin and cellulosecontaining sizing agent is from 3 1 to 10 1.

15. Dispersion under item 10, characterized in that the dispersion contains dispersed particles comprising a mixture of a sizing agent based on rosin and cellulosecontaining sizing agent.

16. The variance in PP. 10 and 15, characterized in that it contains at least one anionic dispersing agent.

17. Variance p. 10 or 15, characterized in that it contains at least one cationic dispersing agent.

 

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The invention relates to a composition for impregnating base paper used for the manufacture of electrochemical kinds of paper

The invention relates to the pulp and paper industry and can be used for the production of newsprint

The invention relates to the technology of making paper-the basics and allows to increase its strength in dry and wet conditions, to reduce the fragility obtained on the basis of the protective film

The invention relates to pulp and paper production and can be used for the manufacture of cardboard for thermal insulation, sole-cellulosic material, Shoe Board reduced thickness and other compositions using the pulp or asbestos fibers and a latex binder

Paper weight // 2042005
The invention relates to the pulp and paper industry, in particular the production of various packaging paper, cardboard, and fiberboard, and can be used mainly for the production of fluting and cardboard for flat layers of corrugated material

The invention relates to the pulp and paper industry

The invention relates to polymeric adhesives and can be used for bonding flexible substrates, such as rubber, leather, textile materials, imitation leather and other materials used in the textile, Shoe, textile, automobile, furniture and other industries

Contact adhesive // 2081145
The invention relates to materials used in industrial production for bonding packaging, newsprint, paper products, cardboard, labeling, etc

The invention relates to organic synthesis, more precisely, to obtain a new mixture of monoamino dibasic carboxylic acids, which can be used as a substitute for rosin in a wax-like, film-forming and adhesive

The invention relates to the production of adhesive compositions based on polychloroprene rubbers used in the radio industry for bonding articles of ferrites

The invention relates to the production of adhesive compositions used in the manufacture of materials with a layer of permanent stickiness, and can find application in the production of sticky tape on a paper basis
Glue melt // 2015152
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