A method of manufacturing paper lichtovannaya

 

(57) Abstract:

The invention relates to manufacturing techniques lichtovannaya paper. The method comprises adding to the aqueous suspension containing cellulosic fibres, and optional fillers anionic or cationic dressing material for dispersion and dressing material for the promoter, forming and drying the resulting suspension. The promoter contains a cationic organic polymer with one or more aromatic groups and anionic polymer with aromatic groups, which stepped polymer, polysaccharide and natural aromatic polymer. Dressing material for dispersion and dressing material for the promoter added to the suspension separately. The method provides an improvement in the process of smoothing. 2 N. and 29 C.p. f-crystals, 6 PL.

The present invention relates to a method for smoothing paper which comprises adding to a suspension containing cellulosic fibres, and optional fillers, anionic or cationic dressing material for dispersion and dressing material for promoter containing cationic organic polymer having one or more aromatic groups; and anionic polymer comprising one or more aromatic groups representing a step Politburo dispersion and dressing material for the promoter is added to aqueous suspensions separately.

Background of the invention

Dispersion or emulsion dressing material for agents used for receiving paper to make the paper and cardboard increased resistance to wetting and penetration of liquids. Dressing material for dispersion usually added to the aqueous suspension containing cellulosic fibres, and optional fillers and various additives. The aqueous suspension is served in the pressure vessel, eject the suspension on the grid, which produce a wet layer of paper. Further to the suspension, as a rule, add compounds such as starches and fine materials that facilitate dehydration of the suspension on the grid. In the process of getting paper water drained from the grid and purified from the fibrous mass, the so-called white water, usually subjected to partial recirculation. The pulp suspension contains a certain amount of fibrous material, such as fillers, charged polymers, dressing material for agents, and a variety of charged impurities, i.e., anionic wastes, electrolytes, colloidal substances, etc. Fibrous material has an impact on the effectiveness of smoothing, usually weakening it. A large number of charged compounds, et the dressing, i.e., receipt paper with satisfactory sizing properties. Other compounds contained in the suspension, worsening the dressing are lipophilic, wood, extractable substances contained in recycled fiber and mechanical pulp. The increased number of added dressing material for agent often improves the dressing, but it causes an increase in cost, and increased accumulation of dressing material for agents in purified from fibrous mass of water. The accumulation of fibrous material, as well as any other component present in the suspension, even stronger in the mills, in which purified from fibrous mass of water is subjected to active recirculation after the introduction in the process of obtaining paper only a small amount of fresh water. Thus, the aim of the present invention is a further improvement of the smoothing. Another objective of the present invention is to improve smoothing when dressing water, pulp suspensions having high conductivity and/or contain a large number of lipophilic, wood, extractables. The following objectives will be specified below.

U.S. patent AK ligninsulfonate acid, condensates naphtalenesulfonic acid and formaldehyde.

WO 0023651 relates to anionic and cationic dressing material for dispersions containing ketene dimer and at least anionic dispersing agent.

EP 984101 describes a dressing material for compositions comprising a ketene dimer or anhydrides of acids and complexing agent selected from aminoalkanoic acids, N-bis - or Tris-((1.2-dicarboxylate)ethyl)amines and phosphonic acids.

US 5972094 relates to a dressing material for compositions containing a thermoplastic resin selected from the group including thermoplastic resins, thermoplastic, hydrocarbon resins, thermoplastic polyamides and thermoplastic amide waxes.

US 5595629 describes a method of producing paper comprising forming water, pulp, paper pulp, and add to it the cationic and anionic polymers to improve retention and/or drainage. Anionic polymer includes formaldehyde condensate salt naphtalenesulfonic acid.

Description of the invention

It was found that the invention in accordance with the attached claims unexpectedly solves the problems mentioned in the application. More specifically, d is holding cellulosic fibers and optional fillers, anionic or cationic dressing material for dispersion and dressing material for promoter containing cationic organic polymer that includes one or more aromatic groups, and anionic polymer comprising one or more aromatic groups representing a stage polymer, polysaccharide, or natural aromatic polymer, molding and drying the resulting suspension in which the dressing material for dispersion and dressing material for the promoter is added to aqueous suspensions separately.

Dressing material for dispersion

Dressing material for the agent contained in the anionic or cationic dressing material for dispersion used in the method in accordance with the present invention, it is a dressing material for any agent with high resistance to wetting and penetration of liquids, such as mecellose-reactive agents, including rosin, for example, reinforced and/or esterified rosin, waxes, fatty acids and derivatives of resin acids, such as fatty amides and complex fatty esters, such as complex truefire natural glycerin fatty acid, and/or cellulosecontaining agents. Dressing material for the dispersion preferably contains cellulosecontaining set to be selected from any cellulosecontaining agents, known in this field. Dressing material for the appropriate agent selected from hydrophobic ketene dimer, multimers of ketene, acid anhydrides, organic isocyanates, carbamoylation and mixtures thereof, preferably, the ketene dimer acids and anhydrides. The ketene dimer is advisable to have the following General formula (I) in which R1and R2represent a saturated or unsaturated hydrocarbon group, typically, saturated hydrocarbons, while hydrocarbon group, it is advisable having from 8 to 36 carbon atoms, typically an alkyl group with straight or branched chain, having from 12 to 20 carbon atoms, such as hexadec or octadecyl. The ketene dimer can be liquid at ambient temperature, for example at 25°C, it is advisable at 20°C. typically, the anhydrides of the acids have the following General formula (II) in which R3and R4may be the same or different and represent saturated or unsaturated hydrocarbon group, it is advisable having from 8 to 30 carbon atoms, or R3and R4together with the residue-C-O-C - can form a 5-6-membered ring, optionally further substituted hydrocarbon E anhydrides of alkyl and alkenyl, and, in particular, succinic anhydride isooctadecyl.

Suitable ketene dimers, acid anhydrides, organic isocyanates include compounds described in U.S. patent No. 4522686 included in this description by reference.

Examples of suitable carbamoylation include carbamylcholine described in U.S. patent No. 3887427, also included in the description by reference.

The method in accordance with the present invention comprises adding to a suspension containing cellulosic fibers, anionic or cationic, water, dressing material for dispersion, i.e., dispersing and/or stabilizing agents present in the dispersion, which can be called “dispersing system”, have a common anionic or cationic charge, respectively. The dispersion system may include any agent that facilitates the formation of a dispersion or emulsion, such as dispersing and/or stabilizing agents, such as polyelectrolytes, surfactants and electrolytes. Anionic, water, dressing material for dispersion may include cationic compounds, i.e., cationic polyelectrolytes (cationic or amphoteric polyelectrolytes with a common cation specialist provided that the total charge of the dispersing system is anionic. On the other hand, the cationic, water, dressing material for dispersion may include anionic compounds, i.e., anionic polyelectrolytes (anionic or amphoteric polyelectrolytes with total anionic charge), and/or anionic surfactants, and/or any other anionic compound known specialist, provided that the total charge of the dispersing system is anionic. Anionic or cationic charge of the dressing material for dispersion can be determined using a ZetaMaster S, version PCS.

In accordance with a preferred embodiment of the present invention anionic or cationic dressing material for the dispersion contains a cationic organic polymer that includes one or more aromatic groups and/or anionic polymer comprising one or more aromatic groups. Cationic organic polymer and anionic polymer can be any of the described polymers contained in the dressing material for the promoter.

Anionic or cationic dressing material for the dispersion added to the suspension may contain from 0.1 to 50 wt.% dressing material for agent by weight of the total dispersion/emulsion, suitable for more than 20 wt.% Dispersivity, preferably from 10 to 35 wt.% Dispersion or emulsion containing dressing material for the agents of the anhydrides of the acids may contain from 0.1 to 30 wt.% anhydrides of acids of the total mass of the dispersion/emulsion, suitable from 1 to 20 wt.% A dispersion containing Metallurgicheskaya dressing material for the agents, it is advisable to have the contents of the dressing material for agents constituting from 5 to 50 wt.%, preferably from 10 to 35 wt.% If anionic and/or cationic polymer having one or more aromatic groups, see the dressing material for dispersion, they are expediently present in amount of about 0.1 wt.% up to 15 wt.% of the mass of the dressing material for the agent.

The amount of dressing material for agent added to the aqueous suspension containing cellulosic fibers, may be from 0.01 to 5 wt.%, suitable from 0.05 to 1.0 wt.% calculated on dry weight of cellulosic fibres and optional fillers, if the dose depends on the quality LightWave pulp or paper, dressing material for the agent and the degree of smoothing.

In accordance with the present invention, anionic or cationic dressing material for dispersion and dressing material for the promoter containing cationic organic polymer that includes one establishi step-like polymer, the polysaccharide or natural aromatic polymer, is added to aqueous suspensions separately. Despite the fact that dressing material for dispersion may contain the same polymers as dressing material for the promoter, a significant improvement smoothing is observed only if the dressing material for the promoter and dressing material for the dispersion is added to the pulp suspension separately. Separate the adding means dressing material for the variance, which may include any polymers dressing material for the promoter, and dressing material for the promoter is added to the pulp suspension (liquid weight) in different places, or essentially in the same place but at different times. Moreover, the cationic organic polymer and anionic polymer, forming a dressing material for the promoter, it is also advisable to add separately. Anionic polymer is preferably added to the suspension after adding as a dressing material for dispersion and a cationic organic polymer.

In accordance with a preferred embodiment of the present invention a method of smoothing the paper comprises adding to an aqueous suspension containing cellulosic fibres, and optional fillers, anionic or cationic dressing material for dispersion containing SHL is twenty polymer, the polysaccharide or natural aromatic polymer, the amount added to the dressing material for suspension agent is from about 0.01 to 5.0 wt.% based on the weight of dry fibers; and dressing material for promoter containing cationic polymer comprising one or more aromatic groups, it represents a cationic polysaccharide or a cationic vinyldithiins polymer and anionic polymer comprising one or more aromatic groups representing a stage polymer, polysaccharide, or natural aromatic polymer, the amount of cationic polymer added to the suspension, is approximately from 0.001 to 3 wt.% based on the weight of dry fibers, and the amount of anionic polymer added to the suspension, is approximately from 0.001 to 3 wt.% based on the weight of dry fibers; forming and drying the resulting suspension in which the dressing material for dispersion and dressing material for the promoter is added to aqueous suspensions separately.

In accordance with the following preferred embodiment of the present invention anionic or cationic dressing material for the dispersion contains a dressing material for the agent, a cationic organic polymer, including the first polymer, and anionic polymer comprising one or more aromatic groups representing a stage polymer, polysaccharide, or natural aromatic polymer, suitable anionic polymer is a step polymer or natural aromatic polymer.

Cationic polymer comprising one or more aromatic groups, it is a cationic polysaccharide having the structural formula (I):

in which R represents the residue of a polysaccharide; a is a chain of atoms, including atoms and N anchoring N to the residue of the polysaccharide, each of R1and R2represents H or a hydrocarbon group, R3represents an aromatic hydrocarbon group, n is an integer from 2 to 300,000, and X-represents an anionic counterion; or vinyldithiins polymer obtained by cationic polymerization of the monomer or mixture of monomers comprising a cationic monomer represented by the General formula (II):

in which R1represents N or CH3; each of R2and R3is altergroup having from 1 to 3 carbon atoms, AND1represents O or NH, IN1submit the containing aromatic group, and X - represents an anionic counterion. More preferably, the cationic polymer comprising one or more aromatic groups, is a cationic polysaccharide having the structural formula (I):

in which R represents the residue of a polysaccharide; a is a chain of atoms, including atoms and N anchoring N to the residue of the polysaccharide, each of R1and R2represents H or a hydrocarbon group, R3represents an aromatic hydrocarbon group, n is an integer from 2 to 300,000, and X-represents an anionic counterion.

Cationic organic polymer that includes one or more aromatic groups

Cationic, organic polymer dressing material for the promoter, it is present in a dressing material for dispersion, can be obtained from natural or synthetic sources and may be linear, branched or Poperechnaya. The cationic polymer preferably may be soluble or dispersible in water. Examples of suitable cationic polymers include cationic polysaccharides, such as starches, guar gums, cellulose, chitina, chitosans, glikana, galactanes, glucans, xanthan gums, pectins the crystals from potatoes corn, wheat, tapioca, rice, waxy maize, oat, etc.; cationic, synthetic organic polymers, such as cationic polymers with increasing chain, for example cationic vinyldithiins polymers, such as polymers based on acrylate, acrylamide and vinylamide, as well as cationic, manual polymers, for example cationic polyurethanes. Especially preferred are cationic, organic polymer selected from polysaccharides, e.g. starches, cationic, vinyldithiins polymers, such as polymers based on acrylamide containing aromatic group.

Aromatic group, a cationic, organic polymer may be present in the base polymer or in a group-Deputy attached to its base (the main chain), preferably in the group-Deputy. Examples of suitable aromatic groups include aryl-, aralk or alcarinque, for example phenyl, phenylene, naphthyl, xylylene, benzyl and phenylethyl; preferably benzyl, nitrogen-containing, aromatic (aryl) groups, for example, pyridine and chinoline, as well as derivatives of these groups. Examples cationogenic groups that may be present in the cationic polymer and the monomers used DNA-additive salt.

In accordance with the preferred cationic organic polymer containing an aromatic group selected from cationic polysaccharides. The aromatic group of the polysaccharide can be attached to a heteroatom, such as nitrogen or oxygen, present in the polysaccharide, and the optional heteroatom is charged, for example, in the case when it is a nitrogen. The aromatic group can also be attached to a group that includes a heteroatom, for example, amide, complex or simple the ether, while these groups may be attached to the base of the polysaccharide (main chain), for example, through a chain of atoms. Examples of suitable aromatic groups and groups containing an aromatic group include aryl - and Uralkaliy, for example phenyl, phenylene, naphthyl, xylylene, benzyl and phenylethyl; nitrogen-containing, aromatic (aryl) groups, for example, pyridine and chinoline, as well as derivatives of these groups in which one or more of the substituents attached to these aromatic groups may be selected from hydroxyl, halides, for example chloride, nitro, and hydrocarbon groups having from 1 to 4 carbon atoms.

Cationic, organic polymer predpochtitel R represents the residue of a polysaccharide; A represents a group that attaches N to the residue of the polysaccharide, it is advisable, chains of atoms, including atoms and N, and, optionally, the atoms and/or N, as a rule, akilagpa having from 2 to 18, it is reasonable, from 2 to 8 carbon atoms optionally interrupted or substituted by one or more heteroatoms, such as O or N, for example, accelerograph or hydroxypropionate (-CH2-CH(OH)-CH2-); each of R1and R2represents H or, preferably, a hydrocarbon group, it is advisable, alkyl having from 1 to 3 carbon atoms, expediently from 1 to 2 carbon atoms; R3it is advisable represents an aromatic hydrocarbon group, including Uralkaliy, for example, benzyl and venlateshappa; n is an integer from about 2 to 300,000, suitable from 5 to 200,000, and preferably from 6 to 125,000, or, alternatively, R1, R2and R3together with N form an aromatic group containing from 5 to 12 carbon atoms; and X-represents an anionic counterion, typically a halide, such as chloride.

Cationic polysaccharide, a modified aromatic group may have a wide range of degree of substitution, the degree of cationic samemeeting of substitution (DSAr) may be from 0.01 to 0.5, it is advisable from 0.02 to 0.3, preferably from 0.025 to 0.2, and the degree of anionic substitution (DSA) can range from 0 to 0.2, suitable from 0 to 0.1, preferably from 0 to 0.05.

Polysaccharides can be obtained from cationic and aromatic modification of the polysaccharide in a known manner using one or more agents containing cationic and/or aromatic group, for example, the interaction of the agent with a polysaccharide in the presence of alkaline substances such as alkali metal or a hydroxide of alkaline-earth metal. Polysaccharide subjected to cationic and aromatic modifications may be nonionic, anionic, amphoteric or cationic. Suitable modifying agents include non-ionic agents, such as, for example, aralkylated, for example benzylchloride and benzylbromide; the interaction products of epichlorohydrin and dialkylamino having at least one Deputy, including the above-mentioned aromatic group, including 3-dialkylamino-1,2-epoxypropane; and cationic agents such as, for example, the interaction product of epichlorohydrin and tertiary amines having at least one Deputy, containing videocase the one and quinoline. Suitable cationic agents of this type include the halides 2,3-epoxypropyltrimethylammonium and halides of garagedoorsofamerica.com, for example, chloride of N-(3-chloro-2-hydroxypropyl)-N-(hydrophobic alkyl)-N,N-di(lower alkyl)ammonium and chloride N-glycidyl-N-(hydrophobic alkyl)-N,N-di(lower alkyl)ammonium, in which the aromatic group are the same as above, especially octyl, decyl and dodecyl, and the lower alkyl represents methyl or ethyl; the halides of halohydrocarbon-N,N-dialkyl-N-alchilamoniu and chloride N-glycidyl-N-(alkaryl)-N,N-dialkylamide, for example, chloride of N-(3-chloro-2-hydroxypropyl)-N-(alkaryl)-N,N-di(lower alkyl)ammonium, in which alcarinque and the group of lower alkyl are the same as defined above, in particular, chloride of N-(3-chloro-2-hydroxypropyl)-N-benzyl-N,N-dimethylammonio; and chloride of N-(3-chloro-2-hydroxypropyl)pyridinium. In General, when using non-ionic aromatic agent, a polysaccharide, it is advisable converted into cationic polysaccharide, applying before or after the hydrophobic modification of any of the cationic agents known in this field. Examples of suitable cationic and/or aromatic modifying agent, modified aromatic groups of the polysaccharides and methods for their production of S. P. Patel, R. G. Patel and V. S. Patel, Starch/ , 41(1989), No. 5, pp. 192-196, the contents of which are incorporated in this description by reference.

In accordance with another preferred embodiment of cationic, organic polymer selected from homopolymers and copolymers derived from one or more monomers comprising at least one monomer having an aromatic group, it is advisable, Ethylenediamine monomer. The synthetic polymer may be razvetvlenno linear or branched. The aromatic group of the synthetic polymer may be present in the base polymer or, preferably, it can be a side group attached to the base polymer or the continuing thereof, or be present in the side group attached to the base polymer or continuing it. Suitable aromatic (aryl) groups include groups containing optionally substituted by panelgroup, optionally substituted by familiegroep, and optionally substituted by aftercrop, for example, groups having the General formula-C6H5- 6H4-, -C6H3-and-C6H2for example, in the form of phenylene (-C6H4-), xylylene (-CH2-C62-C6H5and substituted phenyl (e.g.,- C6H4-Y, -C6H3Y2and-C6H2Y3), in which one or more substituents (Y) attached to the phenyl ring, can be selected from hydroxyl, halides, for example chloride, nitro, and hydrocarbon groups having from 1 to 4 carbon atoms.

The cationic polymer preferably is vinyldithiins polymer. The term “vinyldithiins polymer” in this description means a polymer additive obtained by polymerization of one or more vinyl monomers or Ethylenediamine monomers, including, for example, based monomers acrylamide and acrylate. Cationic polymer suitable chosen from cationic, vinyladdicted polymers obtained by cationic polymerization of the monomer or mixture of monomers comprising a cationic monomer represented by the General formula (II):

in which R1represents N or CH3; each of R2and R3preferably represents altergroup having from 1 to 3 carbon atoms, usually from 1 to 2 carbon atoms; AND1represents O or NH, IN1is akilagpa having from 2 to 8 al, containing an aromatic group, it is advisable, phenyl - or substituted panelgroup, which can be attached to the nitrogen by akilagpa, usually having from 1 to 3 carbon atoms, appropriate, from 1 to 2 carbon atoms, preferably, Q represents a benzyl group (-CH2-C6H5); and X-represents an anionic counterion, typically a halide, such as chloride. Examples of suitable monomers represented by the General formula (II) include Quaternary monomers, obtained by processing benzylchloride dialkylaminoalkyl(meth)acrylates, for example, dimethylaminoethyl(meth)acrylate, diethylaminoethyl(meth)acrylate and dimethylaminopropyl(meth)acrylate, and dialkylaminoalkyl(meth)acrylamides, for example, dimethylaminoethyl(meth)acrylamide, diethylaminoethyl(meth)acrylamide, dimethylaminopropyl(meth)acrylamide and diethylaminopropyl(meth)acrylamide. Preferred cationic monomers of the General formula (II) include Quaternary salts benzylchloride of dimethylaminoethylacrylate and dimethylaminoethylmethacrylate.

Cationic, vinyldithiins (synthetic, cationic) polymer may be a homopolymer derived from a cationic monomer comprising an aromatic Gruppo and one or more copolymerizate monomers. Suitable copolymerizate, non-ionic monomers include monomers represented by the General formula (III):

in which R4represents N or CH3; each of R5and R6represents H or a hydrocarbon group, it is advisable alkyl having from 1 to 6, suitable from 1 to 4, usually 1 to 2 carbon atoms; AND2represents O or NH;2is akilagpa having from 2 to 8 carbon atoms, suitable from 2 to 4 carbon atoms, or hydroxypropylamino, or, alternatively, as a, and nothing is present when there is a simple relationship between C and N (O=C-NR5R6). Examples of suitable copolymerizate monomers of this type include (meth)acrylamide; monomers on the basis of acrylamide, such as N-alkyl(meth)acrylamide and N,N-dialkyl(meth)acrylamide, for example, N-n-propylacetamide, N-isopropyl(meth)acrylamide, N-n-butyl(meth)acrylamide, N-isobutyl(meth)acrylamide and N-tertbutyl(meth)acrylamide; and dialkylaminoalkyl(meth)acrylamide, for example, dimethylaminoethyl(meth)acrylamide, diethylaminoethyl(meth)acrylamide, dimethylaminopropyl(meth)acrylamide and diethylaminopropyl(meth)acrylamide; monomers, acrylate-based, such as dialkylaminoalkyl(meth)acrylate, n is aminohydroxylation; and vinylamide, for example, N-vinylformamide and N-vinylacetate. Preferred copolymerizate, nonionic monomers include acrylamide and methacrylamide, i.e., (meth)acrylamide, with the base polymer preferably is a polymer based on acrylamide.

Suitable copolymerizate cationic monomers include monomers represented by the General formula (IV):

in which R7represents H or CH3; each of R8, R9and R10represents H or, preferably, a hydrocarbon group, it is advisable alkyl having from 1 to 3 carbon atoms, usually from 1 to 2 carbon atoms; AND3represents O or NH;3is akilagpa containing from 2 to 4(?) carbon atoms, suitable from 2 to 4 carbon atoms, or hydroxypropylamino and X-represents an anionic counterion, typically a methyl sulfate or halide, such as chloride. Examples of suitable cationic copolymerizate monomers include acid additive salts and Quaternary ammonium salts of the above-mentioned dialkylaminoalkyl(meth)acrylate and dialkylaminoalkyl(meth)acrylamides, usually obtained with the use of acids such as Hcl, H2SO

Cationic vinyldithiins polymer can be obtained from a mixture of monomers, typically containing from 1 to 99 mol%, suitable from 2 to 50 mol%, preferably from 5 to 20 mol%, cationic monomer comprising an aromatic group, preferably represented by the General formula (II), and from 99 to 1 mol%, suitable from 98 to 50 mol%, preferably from 95 to 80 mol%, other copolymerizate monomers, preferably comprising acrylamide or methacrylamide ((meth)acrylamide), a mixture of suitable monomers comprises from 98 to 50 mol%, preferably from 95 to 80 mol%, (meth)acrylamide, and the sum of the percentages is 100.

The cationic polymer may also be chosen from polymers resulting from the condensation reaction of interaction of one or more monomers containing aromatic GRU is so, which can be used to obtain the cationic polyurethane, cationic of polyamidoamine and so on

Alternatively, the cationic polymer can be a polymer exposed aromatic modification with the use of an agent containing an aromatic group. Suitable modifying agents of this type include benzylchloride, benzylbromide, chloride of N-(3-chloro-2-hydroxypropyl)-N-benzyl-N,N-dimethylammonio and chloride of N-(3-chloro-2-hydroxypropyl)pyridinium. Suitable polymers for such aromatic modifications include vinyldithiins polymers. If the polymer contains tertiary nitrogen, which can be stereoselectivity of the modifying agent, the use of such agents usually leads to the fact that the polymer becomes cationic. Alternatively, the polymer being an aromatic modifications may be cationic, for example, cationic, vinyldithiins polymer.

Typically, the charge density of the cationic polymer is from 0.1 to 6.0 mEq/g dry polymer, suitable from 0.2 to 4.0, and preferably from 0.5 to 3.0.

Srednevekovaja molecular weight synthetic polymers is typically at least approximately 500000, appropriate, more than pribliziteljny about 50000000, usually 30000000, and appropriate, 25000000.

Anionic polymer comprising one

or more aromatic groups

Anionic polymer comprising aromatic group contained in the dressing material for the promoter and optionally contained in a dressing material for dispersion in accordance with the present invention, represents the step polymer, a polysaccharide or natural aromatic polymer. The term “graded polymer” in this description means a polymer obtained stepwise polymerization, and the polymer obtained from step reaction and speed of polymerization, respectively. Anionic polymer contained in the promoter preferably is a step polymer, a polysaccharide or natural aromatic polymer, provided that the anionic polymer is not a polymer obtained by condensation malminkartano acid. The anionic polymer may be a step polymer or natural, aromatic polymer. Anionic polymers in accordance with this invention can be linear, branched or Poperechnaya. Anionic polymer, as a rule, can be water-soluble or moddisplays the polymers are polymers, obtained by condensation of naphthalenesulfonate, such as condensed naphthalenesulfonate and modified lignin polymers, such as ligninsulfonate.

The aromatic group of the anionic polymer may be present in the base polymer or in a group-Deputy, attached to the base polymer (main circuit). Examples of suitable aromatic groups include aryl-, aralk or alcarinque, as well as their derivatives, for example, phenyl, tolyl, naphthyl, phenylene, xylylene, benzyl, phenylethyl, and derivatives of these groups. Examples of anionic charged groups that may be present in anionic polymers and monomers used to obtain the anionic polymer include group bearing an anionic charge, and the acid group bearing an anionic charge after dissolution or dispersion in water, with the groups specified in this description are generally considered to anionic groups, such as phosphate, phosphonate, sulfate, sulfonic acid, sulfonate, carboxylic acid, carboxylate, alcoholate and phenolic group, i.e. the replacement family and nattily. Group carrying anionic charge, usually a salt of an alkali metal, alkaline earth metal or ammonium.

Examples of further suitable anionic products of step polymerization in accordance with the present invention include an additive polymers, i.e. polymers produced additive polymerization such as anionic polyurethanes obtained from a mixture of monomers comprising aromatic ISOC the emer, toluene-2,4 - and 2,6-diisocyanate and difenilmetana-4,4’-diisocyanate. Examples of suitable aromatic alcohols include datanya alcohols, i.e., diols, such as bisphenol a, phenyldiethanolamine, Montereale glycerin and Montereale of trimethylolpropane. Can also be used monohydroxy aromatic alcohols such as phenol and its derivatives. The mixture of monomers may also contain non-aromatic isocyanates and/or alcohols, as a rule, the diisocyanates and diols, for example, any of them, which are known to be used in obtaining polyurethanes. Examples of suitable monomers containing anionic groups include complex monoamine the interaction products triolo, for example, trimethylacetyl, trimethylolpropane and glycerin, with dicarboxylic acids or their anhydrides, such as succinic acid and anhydride, terephthalic acid and anhydride, such as monocalcium glycerin, Montereale glycerin, monocalcium of trimethylolpropane, Montereale of trimethylolpropane, N,N-bis-(hydroxyethyl)-glycine, di(hydroxymethyl)propionic acid, N,N-bis-(hydroxyethyl)-2-aminoetansulfonovaya acid, etc., optional and, as a rule, in combination with the interaction with the base, such as hydroxides by deletesolution, thus, the counterion of the alkali metal, alkaline earth metal or ammonium.

Examples of suitable anionic products of step polymerization in accordance with this invention include anionic, vinyldithiins polymers produced from a mixture of vinyl or Ethylenediamine monomers comprising at least one monomer having an aromatic group and at least one monomer having an anionic group, as a rule, copolymerizable with non-ionic monomers such as monomers on the basis of acrylate and acrylamide. Examples of suitable anionic monomers include (meth)acrylic acid and parameningeal (hydroxytrol).

Examples of suitable anionic polysaccharides include starches, guar gums, cellulose, chitina, chitosans, glikana, galactanes, glucans, xanthan gums, pectins, mannans, dextrins, preferably starches, guar gums and cellulose derivatives, appropriate, starches, including starches from potato, corn, wheat, tapioca, rice, waxy maize and oats, preferably potato starch. Anionic groups in the polysaccharide can be native and/or introduced by chemical methods known in the area is accordance with this invention include lignin Kraft, such as the modified lignin polymers, for example, adducts of lignin, copolymerizable with formaldehyde, sulfonated lignin, for example, extracts ligninsulfonate and tannin, i.e., a natural polyphenolic substances present in the organic extracts of the bark of some species of wood.

Anionic polymer containing an aromatic group, it is selected from the speed of polymers, polysaccharides, and natural aromatic polymer. Preferred are polymers of the type condensed naphthalenesulfonate and modified lignin polymers, such as ligninsulfonate.

Srednevekovaja molecular weight anionic polymer may vary within a wide range depending, inter alia, on the type of the used polymer; it is usually at least about 500, appropriate, higher than about 2000, and preferably higher than about 5000. The upper limit does not matter; it can be about 200000000, as a rule, 150000000, it is advisable 100000000 and preferably 1000000.

The anionic polymer may have a wide range of degree of anionic substitution (DSANDbased, inter alia, on the type of COI is up to 1.5; and the degree of aromatic substitution (DSQ) may be from 0.001 to 1.0, as a rule, from 0.01 to 0.8, it is advisable from 0.02 to 0.7 and preferably from 0.025 to 0.5. If the anionic polymer comprises cationic groups, the degree of cationic substitution (DSc) may be, for example, from 0 to 0.2, suitable from 0 to 0.1 and preferably from 0 to 0.05, while the anionic polymer has an overall anionic charge. Anionic charge density of the anionic polymer is usually from 0.1 to 6.0 mEq/g dry polymer, suitable from 0.5 to 5.0 and preferably from 1.0 to 4.0.

Cationic organic polymer including an aromatic group and an anionic polymer comprising an aromatic group, a dressing material for promoter may be added to the aqueous slurry (raw materials) in any order, separately from the dressing material for dispersion in an amount which can vary within wide limits depending on, inter alia, on the type of raw materials, salt content, type of salts, the content of the filler, form filler, add, etc., In General, the polymers are added in an amount to provide a better dressing than the dressing obtained without adding, typically the cationic organic polymer is added to the raw material before the user is from.%, often at least 0.005 wt.%, calculated on the dry weight of the raw material, while the upper limit is usually 3 wt.%, it is advisable 2.0 wt.% Anionic polymer is usually added in an amount constituting at least about 0.001 wt.%, often at least 0.005 wt.%, calculated on the dry weight of the raw material, while the upper limit is usually 3 wt.%, it is advisable to 1.5 wt.%

In addition to the cationic organic polymer and anionic polymer, dressing material for the promoter may contain other compounds that improve the efficiency of smoothing, such as anionic mikrosmeshcheniya materials, such as particles based on silica and clay type smectite, cationic organic polymers with a low molecular weight, aluminum compounds such as aluminum alum, aluminates, aluminium chloride, aluminum nitrate, as well as connections of polyamine, such as the chlorides of polyalanine, sulfates of polyalanine, connection polyalanine containing ions such as chloride and sulfate, silicate-sulphate of polyalanine and their mixtures, anionic vinyldithiins polymers and combinations thereof.

The method in accordance with this invention is preferably used for obtaining a paper from a suspension containing the raw material is at least 0,20 MS/cm, it is advisable, at least, of 0.5 MS/cm, preferably at least a 3.5 MS/cm. Very good smoothing results are observed at the level of conductivity comprising the above is 5.0 MS/cm, and even more than 7.5 MS/cm. Conductivity can be measured using standard equipment, such as, for example, the device WTW LF 539 produced hristian Berner. The above values are expediently determined by measuring the conductivity of the pulp suspension supplied in the discharge capacity of the machine for paper or in it, or, alternatively, by measuring the conductivity of the treated fibrous mass of water resulting from dewatering of the suspension. A high level of conductivity indicates the high content of salts (electrolytes), various salts can be based on one-, two - and multivalent cations, such as alkali metals, for example, PA+and+, alkaline earth metals such as CA2+and mg2+the ions of aluminum, for example, Al3+, Al(Oh)2+and Jonah polyaluminum, as well as one-, two - and multivalent anions, such as halides, for example, CL-, sulfates, for example, SO-24and S-4, carbonates, for example, WITH23and HCO-

The present invention also relates to methods of producing paper, in which purified from fibrous mass of water-intensive recycle (return to re-cycle), i.e. with a high degree of cyclization purified from fibrous mass of water using, for example, from 0 to 30 tons of fresh water per tonne of produced dry paper, usually less than 20, a is the Recirculation of the cleaned fibrous mass of water, the resulting application of the method, it involves mixing the specified water and cellulose fibers and/or optional fillers to obtain LightWave suspension; it preferably involves mixing purified from fibrous mass of a water suspension containing cellulosic fibres, and optional fillers to feed slurry on the forming grid for smoothing.

Additional additives usually used in obtaining the paper, such as, for example, additional agents that provide strength in dry and wet conditions, of course, can be used in combination with additives in accordance with this invention. The pulp slurry or raw materials can also contain mineral fillers of conventional type, such as, for example, kaolin, white clay, titanium dioxide, gypsum, talc, as well as natural and synthetic calcium carbonates such as chalk, ground marble and precipitated calcium carbonate.

The method in accordance with this invention is used to obtain the paper. The term “paper” in this description, of course, means not only paper and receive it, but also other sheet or film products, such as the Umaga from different kinds of suspensions of cellulose fibers, these suspensions must contain appropriate, at least 25 wt.%, preferably, at least 50 wt.%, such fibers in the dry substance. Based suspensions can comprise fibers from chemical pulp, such as sulphate, sulphite and organosolv pulp, wood pulp, such as thermogravity mass, chemical thermogravity weight, refined cellulose and cellulose from crushed wood from both hard and soft; and recycled fibers, not necessarily derived from recycled cellulose and mixtures thereof. This invention is particularly applicable when getting paper from a suspension on the basis of cellulose, including recycled fiber and recycled pulp, the content of cellulose fibers such an origin can be up to 100%, expediently from 20 to 100%.

Further, the invention is illustrated by the following examples, which, however, does not mean its limitations. Share and % mean mass fraction and %, respectively, unless otherwise specified.

In all the following examples dressing material for dispersion and dressing material for the promoter is added to the pulp suspension separately. Moreover, if p is ansii separately with respect to each other and dispersion.

Example 1

The effectiveness of the smoothing method determined by applying the test 60 bb, (table 1).

Get dressing material for anionic dispersion containing generalelection, condensed naphthalenesulfonate and chloride, di(hydrogenated tallow) dimethylammonio. Dressing material for dispersion containing 30% D, 4% chloride, di(hydrogenated tallow) dimethylammonio and 6% condensed naphthalenesulfonate based D. Dressing material for the dispersion added to the raw material in a quantity of 5 kg D per ton of dry material.

Test 2 dressing material for the promoter contains condensed naphthalenesulfonate (produced under the trademark mol®) and cationic starch with a cationic substitution DS constituting 0,065 relative to the nitrogen containing bansalrupal. In test 1 to the charging roll type cationic starch without aromatic groups with cationic substitution, components 0,065, and anionic particles, inorganic dockside silicon used in the form of Zola, i.e., anionic, non-aromatic polymer.

The core of the charging roll is 80 wt.% sulphate pulp of bleached birch/pine (60/40) and 20 wt.% Caso3purified up to 200 SF and containing 0.3 g/l of raw materials PA2Determine dressing material for the effectiveness of the method (test 60 cobb) (see table 2), adding the same anionic, dressing material for dispersion as in example 1, and dressing material for the promoter containing cationic starch with a cationic substitution DS constituting 0,065 relative to nitrogen, including bansalrupal and anionic particles, an inorganic silicon oxide (test 1); and a promoter containing condensed naphthalenesulfonate (produced under the trademark mol®) and cationic starch with a cationic substitution DS constituting 0,065 relative to the nitrogen containing bansalrupal (test 2). However, the charging roll add calcium chloride to achieve a conductivity equal to 5000 µs/cm, thereby simulating a charging roll having a high conductivity.

Example 3

Determine the effectiveness of smoothing using cationic, dressing material for dispersion containing 15% dimer of alkylbetaine, 2% cationic starch and 0.6% of sodium lignosulphonate based D. Components and add the number of components contained in a dressing material for the promoter listed in table 3, include condensed naphthalenesulfonate, cationic starch with aromatic groups with DS, 0.065, while cationic starch comprising an aromatic group with DS, 0.065, and anionic, EE pH, equal to 8.1, and conductivity equal to 5000 µs/cm, obtained by adding to the raw material of calcium chloride.

Example 4

Get anionic, dressing material for dispersion containing 8.9% of commercial dimer of alkylbetaine, 0,89% aromatic, substituted, cationic starch having a DS, 0.065, and containing bansalrupal, and 0.22% condensed naphthalenesulfonate manufactured under the trademark mol®. Anionic dispersion in the quantity constituting 0,0115% (calculated on dry substance), on the basis of the dimer of ketene, is added to the pulp suspension (calculated on dry substance) containing 30% pine wood, 30 wt.%, 40% eucalyptus and 15% of the besieged caso3. The conductivity of the suspension is 500 µs/refer To suspensions also add dressing material for the promoter containing benzylamine starch with DS, 0.065, and condensed naphthalenesulfonate manufactured under the trademark mol® (test 2).

The same suspension also add the same anionic dispersion. However, dressing material for the promoter to be added to the suspension, which does not contain aromatic polymers. Dressing material for the promoter contains a cationic starch with DS, 0.065, not including aromatic groups, and anionic, near the corresponding agent (D) dispersion are shown in table 4.

Example 5

This example uses the same variance and dressing material for the promoters, as in example 2, except that the conductivity of the suspension is 5000 µs/see

The number of polymers promoter and dressing material for the agent (D) dispersion are shown in table 5.

Example 6

The effectiveness of the smoothing method determined by applying the test 60 bb. Get dressing material for anionic dispersion containing dimer of alkylbetaine, condensed naphthalenesulfonate and chloride, di(hydrogenated tallow) dimethylammonio. Dressing material for dispersion containing 30% D, 4% chloride, di(hydrogenated tallow) dimethylammonio and 6% condensed naphthalenesulfonate based D. Dressing material for the dispersion is added to raw materials in the amount of 0,3 kg D per ton of dry material.

Cationic starch with a cationic substitution DS, 0.065 relative to the nitrogen containing bansalrupal, and starch with a cationic substitution DS, 0.065, used in conjunction with the condensed naphthalenesulfonates and melaninogenica respectively.

The core of the charging roll is 80 wt.% sulphate pulp from birch/pine (60/40) and 20 wt.% Caso

1. A method of manufacturing lichtovannaya paper, comprising adding to the aqueous suspension containing cellulosic fibres, and optional fillers, (i) anionic or cationic dressing material for dispersion; and (ii) dressing material for promoter containing cationic, organic polymer that includes one or more aromatic groups, and anionic polymer comprising one or more aromatic groups, and the anionic polymer is a stage polymer, polysaccharide, or natural aromatic polymer, molding and drying the resulting suspension in which the dressing material for dispersion and dressing material for the promoter is added to aqueous suspensions separately.

2. The method according to p. 1, in which the cationic organic polymer and anionic polymer contained in the dressing material for the promoter, is added to aqueous suspensions separately.

3. The method according to p. 1 in which the anionic polymer comprising aromatic group contained in the dressing material for the promoter, is added to aqueous suspension after adding as a dressing material for dispersion and a cationic organic polymer including an aromatic group contained in the dressing material for the promoter.

4. The method according to any of Prodigy vinyl-additive polymer.

5. The method according to any of the preceding paragraphs, in which the cationic organic polymer is a cationic polysaccharide having the structural formula (I)

in which R represents the residue of a polysaccharide;

A represents a chain of atoms, including atoms and N anchoring N to the residue of the polysaccharide;

each of R1and R2represents H or a hydrocarbon group;

R3represents an aromatic hydrocarbon group;

n is an integer from 2 to 300,000;

X-represents an anionic counterion;

and/or vinyl-additive polymers obtained by cationic polymerization of the monomer or mixture of monomers containing cationic monomer represented by the General formula (II)

in which R1represents N or CH3;

each of R2and R3is altergroup having from 1 to 3 carbon atoms;

A1 represents O or NH;

B1is akilagpa having from 2 to 8 carbon atoms, or hydroxypropylamino;

Q is the Deputy comprising an aromatic group;

X-represented the district of polysaccharides.

7. The method according to p. 1, in which the cationic organic polymer is selected from cationic starch.

8. The method according to p. 1, in which the cationic organic polymer is selected from cationic polysaccharides, having structural formula (I)

in which R represents the residue of a polysaccharide;

A represents a chain of atoms, including atoms and N anchoring N to the residue of the polysaccharide;

each of R1and R2represents H or a hydrocarbon group;

R3represents an aromatic hydrocarbon group;

n is an integer from 2 to 300,000;

X-represents an anionic counterion.

9. The method according to p. 8, in which a represents akilagpa having from 2 to 18 carbon atoms, optionally interrupted or substituted by one or more heteroatoms; each of R1and R2represents H or altergroup having from 1 to 3 carbon atoms; R3represents benzyl or venlateshappa.

10. The method according to any of the preceding paragraphs, in which the anionic polymer is a step polymer or natural aromatic polymer.

11. The method according to any of paragraphs.1-9, in which anonymer lignin.

12. The method according to any of paragraphs.1-9, in which the anionic polymer is a condensed naphthalenesulfonate or ligninsulfonate.

13. A method of manufacturing lichtovannaya paper, comprising adding to the aqueous suspension containing cellulosic fibres, and optional fillers, (i) anionic or cationic dressing material for dispersion containing dressing material for the agent and anionic polymer comprising one or more aromatic groups; and (ii) dressing material for promoter containing cationic, organic polymer that includes one or more aromatic groups, and anionic polymer comprising one or more aromatic groups, forming and drying the resulting suspension in which the dressing material for dispersion and dressing material for the promoter added separately.

14. The method according to p. 13, in which the dressing material for the dispersion further comprises a cationic, organic polymer that includes one or more aromatic groups.

15. The method according to p. 13 or 14, in which the cationic organic polymer is a cationic polysaccharide or a cationic vinyl-additive polymers.

16. The method according to p. 13 or 14, in which the cationic organic polymer is cation is Farida;

A represents a chain of atoms, including atoms and N anchoring N to the residue of the polysaccharide;

each of R1and R2represents H or a hydrocarbon group;

R3represents an aromatic hydrocarbon group;

n is an integer from 2 to 300,000;

X-represents an anionic counterion;

or vinyl-additive polymer obtained by cationic polymerization of the monomer or mixture of monomers containing cationic monomer represented by the General formula (II)

in which R1represents N or CH3;

each of R2and R3is altergroup having from 1 to 3 carbon atoms;

A1 represents O or NH;

B1is akilagpa having from 2 to 8 carbon atoms, or hydroxypropylamino;

Q is the Deputy comprising an aromatic group;

X-represents an anionic counterion.

17. The method according to PP.13 or 14, in which the cationic organic polymer is a cationic polysaccharide.

18. The method according to p. 17, in which the cationic organic polymer is cation is Farida;

A represents a chain of atoms, including atoms and N anchoring N to the residue of the polysaccharide;

each of R1and R2represents H or a hydrocarbon group;

R3represents an aromatic hydrocarbon group;

n is an integer from 2 to 300,000;

X-represents an anionic counterion.

19. The method according to p. 18, in which a represents akilagpa having from 2 to 18 carbon atoms, optionally interrupted or substituted by one or more heteroatoms; each of R1and r2represents H or altergroup having from 1 to 3 carbon atoms; R3represents benzyl or venlateshappa.

20. The method according to any of paragraphs.13-19, in which the anionic polymer is a stage polymer, polysaccharide, or natural aromatic polymer.

21. The method according to any of paragraphs.13-19, in which the anionic polymer is a step polymer or natural aromatic polymer.

22. The method according to any of paragraphs.13-19, in which the anionic polymer is a polymer obtained by condensation of naphthalenesulfonate, or a modified polymer lignin.

23. The method according to any of the so -

24. The method according to any of the preceding paragraphs, in which the dressing material for an agent is a pulp-dressing material for reactive agent.

25. The method according to any of the preceding paragraphs, in which the dressing material for an agent is a dimer of ketene or the anhydride of the acid.

26. The method according to any of paragraphs.1-24, dressing material for which the agent is an acid anhydride.

27. The method according to any of the preceding paragraphs, in which the conductivity of the suspension is at least a 4.5 MS/see

28. The method according to any of paragraphs.13-27, in which cationic, organic polymer and anionic polymer contained in the dressing material for the promoter, is added to aqueous suspensions separately.

29. The method according to any of paragraphs.13-28, in which the anionic polymer is contained in a dressing material for the promoter, is added to aqueous suspension after adding as a dressing material for dispersion and a cationic organic polymer contained in the dressing material for the promoter.

30. The method according to any of the preceding paragraphs in which the number of cationic, organic polymer dressing material for promoter added to the suspension is from about 0.001 to about 3 wt.% calculated on dry fiber, is but about 0.001 to about 3 wt.% calculated on dry fiber.

31. The method according to any of the preceding paragraphs in which the number added to the suspension dressing material for dispersion is from about 0.01 to about 5 wt.%, calculated as the weight of the dressing material for the agent on the weight of dry fibers.

Priority items:

07.08.2000 on PP.13, 23-28, 30-31;

02.08.2001 on PP.1-12, 14-22, 29.



 

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FIELD: mining industry and mechanical engineering.

SUBSTANCE: the invention is dealt with methods of production of a paper, in particular, with its smoothing. The water suspension containing cellulose fibers and optional fillers (i) add the sizing dispersion containing a sizing agent and a polymer including one or several aromatic groups and (ii) a sizing promoter containing a polymer intercalating one or several aromatic groups. Mould and dry the produced suspension. The sizing dispersion and sizing promoter are added to the water suspension separately. The invention ensures improvement of the process of sizing the cellulose fibers having a high conductivity.

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139 cl, 1 dwg, 3 tbl, 16 ex

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15 cl, 6 tbl, 3 ex

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26 cl, 5 tbl, 3 ex

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21 cl, 3 tbl

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11 cl, 3 tbl, 2 ex

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27 cl, 14 tbl, 13 ex

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