CN100587000C - Composition containing amphoteric water-soluble polymer - Google Patents

Abstract

An object of the present invention is to provide a composition excellent in various flocculation performances for various sludge and papermaking systems, especially excellent as a polymer flocculant,and provide a sludge-dewatering agent excellent in dewatering performances for various sludge, especially excellent in flocculationability, as well as a retention aid which can realize a high retention and ensure excellent formation of paper and which is easy to use. A composition is provided, which comprises two or more amphoteric water-soluble polymers in combination shown below, the polymers being obtained by polymerizing a cationic radical-polymerizable monomer and an anionic radical-polymerizable monomer in a presence of a polysaccharide. 1. A combination of a polymer satisfying the molarratio of the cationic radical-polymerizable monomer to the anionic radical-polymerizable monomer (hereinafter referred to as Ca/An) of Ca/An 1, and a polymer satisfying Ca/An<1, or 2. a combination of two kinds of polymers satisfying Ca/An 1.

Description

The composition that contains amphoteric water-soluble polymer

Technical field

The present invention relates to contain the composition of amphoteric water-soluble polymer.Composition of the present invention can be used as polymer flocculant and is particularly useful for sludge dewatering agent, retention aid, thickening material and other application.Therefore, composition of the present invention can be advantageously used in these technical fields.

Background technology

Water-soluble polymers, especially have high-molecular weight those, be used for various technical fields such as polymer flocculant, retention aid, thickening material routinely.

Usually be used as the sludge dewatering that above-mentioned water-soluble polymers is particularly useful for paper waste by the polymkeric substance of forming with the starch of water-soluble polymers modification (polymkeric substance of starch conversion hereinafter referred to as), this is because they have good consistency and demonstrate good sludge dewatering performance with the paper pulp that is included in the waste water.

Except the application as the sludge dewatering agent, the polymkeric substance of also having studied starch conversion is used for additive for papermaking, for example application of retention aid, and this is to have good consistency and the paper with various premium propertiess is provided because of them and paper pulp.

Polymkeric substance and production method thereof as starch conversion, can mention and for example have particular viscosity, have the polymkeric substance of specific positively charged ion etherification starch as trunk polymer, the side chain graft (patent documentation 1) to described trunk polymer that wherein has the cation group of quaternary ammonium modification, have the polymkeric substance of polysaccharide as trunk polymer, wherein (methyl) acrylamide and (methyl) acrylic acid multipolymer or its salt are as side chain graft (patent documentation 2) to described trunk polymer, the production method that perhaps comprises the steps: use reductionoxidation polymerization initiator or cerium base polymerization starter, the quaternary salt (non-patent literature 1) of copolymerization polysaccharide and dimethylaminoethyl acrylate methyl base ammonia ethyl ester.

Simultaneously, cationic polymer flocculent usually is used for sludge dewatering separately.

Yet in recent years, because the generation increase of mud and the deterioration of mud performance, the disposing capacity of conventional cationic polymer flocculent is limited, and with regard to the water capacity of dewatered sludge cake, SS rate of recovery or the like, not necessarily disposes mud satisfactorily.Owing to need to improve these aspects, studied various amphiphilic polymers flocculation agents and used their dehydration method.

For example, following research is known: wherein the normal Fuyang of specific ion ionic amphiphilic polymers flocculation agent joins the method that makes sludge dewatering (patent documentation 3) that does not contain in the organic sludge that inorganic mud and pH are 5-8, wherein under pH5-8, the method that makes sludge dewatering (patent documentation 4) that acrylate-based cationic polymer flocculent is used in combination with the amphiphilic polymers flocculation agent that is used for organic sludge, the rich anionic amphiphilic polymers flocculation agent that wherein has specific composition joins in the mud, described mud is supplemented with inorganic flocculating agent and is set in the dewatering (patent documentation 5) that is less than or equal under the pH5, inorganic flocculating agent wherein, anionic polymer and Fuyang ionic amphiphilic polymers flocculation agent join the method for disposing of sewage (patent documentation 6) in the sewage according to the order of sequence, or the like.

Simultaneously, in paper technology, be diluted to ultimate density in being fed in the paper machine or afterwards, to wherein adding retention aid, flow to the plain boiled water from paper machine routinely, so improve retention rate so that prevent filler and paper pulp at the raw material that contains filler.

As retention aid, use water-soluble polymers usually, for example water miscible high molecular weight polyethylene oxide and cationic polyacrylamide.

Yet, must use the retention aid that contains these water-soluble polymerss relatively in large quantities, so that improve retention rate.As a result, they are debatable, because produce a large amount of cotton-wool (flocs), so the significantly formation of deterioration paper.

In order to address this problem, notice the so-called binary system that wherein is used in combination cationic polymers and anionic compound or polymkeric substance recently.Its representative instance comprises wherein after adding cationic polymers and adds the anionic inorganic compound, for example the method for boron-moisten soil (patent documentation 7) and the method (patent documentation 8) of wherein adding the negatively charged ion colloided silica after the interpolation cationic polymers.

Patent documentation 1: Japanese patent publication (Kokoku) No.62-21007 (claim).

Patent documentation 2: the Japanese Patent spy opens (Kokai) No.6-254306 (claim).

Non-patent literature 1:Bulletin of the Chemical Society ofJapan, 1976,10:1625-1630.

Patent documentation 3: Japanese patent publication (Kokoku) No.5-56199 (claim).

Patent documentation 4: Japanese Patent No.2933627 (claim).

Patent documentation 5: Japanese patent publication (Kokoku) No.6-239 (claim).

Patent documentation 6: the Japanese Patent spy opens (Kokai) No.6-134213 (claim).

Patent documentation 7: the Japanese Patent spy opens (Kokai) No.4-281095 (claim).

Patent documentation 8: Japanese Patent No.2945761 (claim).

Summary of the invention

The problem to be solved in the present invention

Although have the advantage of oneself separately,, can not think that they are always effective for the trend that nearest waste water is difficult to dewater in the amphiphilic polymers base sludge dewatering agent described in the patent documentation 3-6.

In addition, although good relatively in the balance of the retention aid described in patent documentation 7 and 8 between retention rate and paper formation, the improvement level is still not enough.In addition, these retention aids comprise two kinds of liquid that must be used in combination, so their shortcoming is that they must use in the mode of complexity in paper technology, for example consider each liquid that when and where adds each liquid and what add together.

In addition, when patent documentation 1 and 2 and non-patent literature 1 described in the polymkeric substance of starch conversion as polymer flocculant, for example when sludge dewatering agent and retention aid, they usually flocculate or the flocculation deficiency of dewatering, and this depends on the kind of waste water or is included in the kind of the pulpwood material in the raw material.Especially, depend on the type of mud, they demonstrate insufficient flocculence.More particularly, they are not satisfied because after adding these polymer flocculant, do not make cotton-wool apace, and even after continuing to stir, be not to be difficult to cave in.

In order to address the above problem, the contriver advises following polymer flocculant, and described polymer flocculant comprises the composition that contains two kinds of amphiphilic polymers, the ion equivalent of these two kinds of amphiphilic polymers differ from one another (patent documentation 9).

This polymer flocculant demonstrates good performance solving above-mentioned problem, but is insufficient sometimes when using in the application that requires better sludge dewatering performance and better retention rate.Especially when it when the sludge dewatering agent, flocculence may be not enough, this depends on the type of mud and more particularly, above-mentioned aspect is insufficient.In addition, when it was used as retention aid, it provided good retention rate, but not enough sometimes aspect the formation of paper, this depends on the type of raw material.

The contriver furthers investigate, and is used for the composition that demonstrates various good flocculating properties of various mud and papermaking systems with searching, especially as the good composition of polymer flocculant.In addition, the contriver furthers investigate, and is used for the dewatering of various mud with searching, the sludge dewatering agent that especially flocculence is good, and can realize high retention rate, can guarantee that good paper forms, and easy-to-use novel retention aid.

Patent documentation 9: the Japanese Patent spy opens (Kokai) No.2003-175302 (claim).

The mode that addresses this problem

The result that the contriver carries out various researchs is, the composition that discovery contains two or more amphoteric water-soluble polymers is effective, described polymkeric substance is by polymerization polysaccharide and cationic monomer and anionic monomer acquisition, and wherein said polymkeric substance is differing from one another aspect the described monomer ratio.This discovery causes finishing the present invention.

Below describe the present invention in detail.

In this manual, acrylate or methacrylic ester are expressed as (methyl) acrylate; Acrylic or methacrylic acid is expressed as (methyl) vinylformic acid; Be expressed as (methyl) acrylamide with acrylamide or methacrylic acid amino.

1. amphoteric water-soluble polymer

Employed amphoteric water-soluble polymer among the present invention (hereinafter referred is an amphiphilic polymers) is in the presence of polysaccharide, by the polymkeric substance of polymerizing cationically free radical polymerization monomer (hereinafter referred is a cationic monomer) and radical anion polymerisable monomer (hereinafter referred is an anionic monomer) acquisition.

Below each component and production method will be described.

1-1. polysaccharide

In the present invention, can use various polysaccharide.

As an example, the polysaccharide from natural origin comprises starch.The specific examples of starch comprises W-Gum, wheat starch, Starch rice, tapioca (flour), sago starch, glucomannan (glumannan) and the Polygalactan of potato starch, wax shape potato starch, sweet potato starch, sugared W-Gum, high amylose starch; With the starch starting material, for example the sweet potato of whole meal flour, corn flour, cutting and exsiccant and the cutting and the exsiccant cassava.

The example of the polysaccharide except starch comprises Mierocrystalline cellulose, for example methylcellulose gum, ethyl cellulose, Natvosol and carboxymethyl cellulose, sodiun alginate, gum arabic, dextran, gelatin, casein, collagen, chitin and chitosan.

Preferred polysaccharide is a starch, specifically comprise above-described starch, for example W-Gum, wheat starch, Starch rice, tapioca (flour), sago starch, glucomannan and the Polygalactan of potato starch, wax shape potato starch, sweet potato starch, sugared W-Gum, high amylose starch.

Starch can be the starch producing that obtains by chemistry or enzyme-modified.Working method comprises for example oxidation, esterification, etherificate and acid treatment.

Employed polysaccharide preferably becomes positively charged ion or the above-described polysaccharide of amphoteric by common methods among the present invention, and this is because the flocculation agent that they have high copolymerization and excellent property is provided with described monomer subsequently.

Can pass through common methods cationization polysaccharide.

The cationization method comprises with cationic agent handles the starch starting material.The specific examples of cationic agent comprises tertiary amine, for example diethyl aminoethyl chlorine and quaternary ammonium salt, for example 3-chloro-2-hydroxypropyl-trimethyl ammonium chloride and glycidyl trimethyl ammonium chloride.

The positively charged ion substitution value of cationization polysaccharide is preferably 0.01-0.06 w/w %, more preferably 0.02-0.06 w/w % with regard to nitrogen-atoms.

Polysaccharide can be for example to carry out those of known response after cationization.As an example, they can be the amphoteric polysaccharides that carried out the anionization reaction.The specific examples of anionization reaction comprises the phosphorylation of using inorganic phosphate or analogue; Use the urea phosphorylation and the oxidation of hypohalite or analogue; Use the carboxymethylation of monochloro acetate; And sulfation.

Preferably use polysaccharide, therefore preferably carried out those of boiling processing with the glue form.Herein " boiling " be meant the processing of heating polysaccharide under its gelation temperature or the higher temperature.Can optionally set Heating temperature herein, this depends on starch type to be used, but is preferably greater than or equals 70 ℃.Can in intermittence or continuous processing, carry out the boiling of starch.

Can be after above-described cationization or carry out boiling simultaneously.

Preferably, using Brookfield viscometer, is 100-10000mPa.s in the viscosity of 25 ℃ and the starch glue to be used measured under 10-40 weight % solids content.

Preferred dilute with water polysaccharide glue used in the present invention, and make the slurries of 3-10 weight %.

Aging or solidify or during the dispersed variation in water, preferably before using, carry out boiling and handle when the polysaccharide glue.In the case, boiling method can be with above-described identical.

1-2. cationic monomer

Cationic monomer can be an all cpds, as long as they have the free radical polymerizability, its specific examples comprises with (methyl) propenoic acid dialkyl aminoalkyl ester, for example the hydrochloride of (methyl) vinylformic acid dimethylamino ethyl ester, (methyl) vinylformic acid diethylamino ethyl ester, (methyl) vinylformic acid dimethylamino ethyl ester, (methyl) vinylformic acid diethylamino-2-hydroxypropyl acrylate and (methyl) vinylformic acid dimethylamino propyl ester and uncle's salt that vitriol is example; With dialkyl aminoalkyl (methyl) acrylamide, the hydrochloride of dimethyl aminoethyl (methyl) acrylamide and vitriol uncle's salt of being example for example; With the alkylogen adducts, for example methyl chloride adducts and aryl halide adducts, for example the benzyl chloride adducts of the amino alkane ester of (methyl) propenoic acid dialkyl is the quaternary salt of example; With with the alkylogen adducts, for example methyl chloride adducts and aryl halide adducts, for example the benzyl chloride adducts of dialkyl aminoalkyl (methyl) acrylamide is the quaternary salt of example.

In the middle of these compounds, the quaternary salt of the amino alkane ester of preferred (methyl) propenoic acid dialkyl; The more preferably alkylogen adducts of the amino alkane ester of (methyl) propenoic acid dialkyl.

1-3. anionic monomer

Anionic monomer can be an all cpds, as long as they have the free radical polymerizability, its specific examples comprises unsaturated carboxylic acid, for example (methyl) vinylformic acid, Ba Dousuan, methylene-succinic acid and toxilic acid and salt thereof.The example of salt comprises for example salt of sodium and potassium of ammonium salt and basic metal.

In the middle of these, preferred (methyl) vinylformic acid.

1-4. other monomer

In the present invention, amphiphilic polymers comprises that cationic monomer and anionic monomer are as requisite component with can optionally further comprise non-ionic free radical polymerization monomer (non-ionic monomer hereinafter referred to as).

Non-ionic monomer comprises the ethylene oxide adduct of (methyl) acrylamide, dimethyl (methyl) acrylamide, diethyl (methyl) acrylamide, (methyl) Hydroxyethyl acrylate, methoxyl group (methyl) acrylate and the ethylene oxide adduct of (methyl) allyl ethers.

In the middle of these, preferred (methyl) acrylamide.

Can optionally be used in combination the monomer except above-described monomer.Other monomer for example comprises (methyl) vinylformic acid methoxyl group ethyl ester, (methyl) vinylformic acid butoxy ethyl ester, (methyl) vinylformic acid ethyl carbitol ester, (methyl) methyl acrylate, (methyl) ethyl propenoate and vinyl-acetic ester.

1-5. production method

Amphiphilic polymers of the present invention is in the presence of polysaccharide, by the polymkeric substance of polymerizing cationically monomer and anionic monomer acquisition.

This class production method for example comprises wherein according to common methods, in the presence of polymerization starter and polysaccharide, and the method for polymerizing cationically monomer and anionic monomer.

Hereinafter will explain each component to be used, polymerization process or the like.

1) polysaccharide and monomeric ratio with combine

In speaking of amphiphilic polymers of the present invention when polysaccharide and monomeric ratio, based on polysaccharide and all monomeric total amounts, monomeric ratio is preferably more than or equals 50 weight %, more preferably 50-99 weight %.

When monomeric ratio during less than 50 weight %, resulting polymers is insoluble in water sometimes, and the high-molecular weight polymer as flocculation agent perhaps is not provided.

As monomeric preferably combination among the present invention, can mention that (1) contains uncle's salt of the amino alkane ester of propenoic acid dialkyl or quaternary salt as cationic monomer, acrylate is as anionic monomer and the acrylamide multipolymer as non-ionic monomer, (2) contain uncle's salt of methacrylic acid dialkyl amido alkane ester or quaternary salt as cationic monomer, acrylate is as anionic monomer and the acrylamide multipolymer as non-ionic monomer, (3) contain uncle's salt of the amino alkane ester of uncle's salt of methacrylic acid dialkyl amido alkane ester or quaternary salt and propenoic acid dialkyl or quaternary salt as cationic monomer, acrylate is as anionic monomer and the acrylamide multipolymer as non-ionic monomer.

2) polymerization starter

Polymerization starter comprises azo polymerization initiator, reductionoxidation polymerization initiator, Photoepolymerizationinitiater initiater and analogue.Hereinafter each polymerization starter will be described.

(1) azo polymerization initiator

All cpds can be used as azo polymerization initiator, and its specific examples comprises 4,4 '-azo (4-cyanopentanoic acid) (10 hours half life temperatures: 69 ℃; Below the temperature in bracket, described be meant identical implication); 2,2 '-azobis isobutyronitrile (65 ℃); 2,2 '-two (2-methylbutyronitrile) (67 ℃) of azo; 2,2 '-azo two [2-methyl-N-(2-hydroxyethyl) and acid amides] (86 ℃); 2,2 '-two (2-amidine propane) hydrochlorides (56 ℃) of azo; With 2,2 '-two [2-(2-tetrahydroglyoxaline-2-yl) propane] hydrochlorides (44 ℃) of azo.

Can use azo polymerization initiator separately or in conjunction with two or more.

In the middle of above-described azo polymerization initiator, preferred compound is an azo polymerization initiator, preferred compound is that 10 hours half life temperatures are more than or equal to 50 ℃, more preferably 50-90 ℃, even more preferably 50-70 ℃ azo polymerization initiator, this is because they have high solubleness in water, generates not contain or contain the seldom amphiphilic polymers of insolubles, produce the high-molecular weight amphiphilic polymers, and the unreacted monomeric amphiphilic polymers that contains the reduction amount is provided.

Based on polysaccharide and monomeric total amount, the ratio of azo polymerization initiator to be used is 50-5000ppm preferably, more preferably 100-3000ppm, even more preferably 300-1000ppm.The residual monomer that causes incomplete polymerization and increasing amount less than the ratio of the azo polymerization initiator of 50ppm; The water-soluble polymers of lower molecular weight is provided greater than 5000ppm.

(2) reductionoxidation polymerization initiator

The reductionoxidation polymerization initiator is the combination of Oxidizing and Reducing Agents.

Oxygenant is superoxide preferably, this be because it to polysaccharide have the dehydrogenation effect and advantageously with monomer-grafted to polysaccharide.The example of superoxide comprises persulphate, for example Sodium Persulfate, Potassium Persulphate and ammonium persulphate, organo-peroxide, for example benzoyl peroxide, t-butyl hydroperoxide and succinic acid peroxide, hydrogen peroxide and sodium bromate.In the middle of these superoxide, preferred persulphate, because when polymerization begins, at low temperatures, their dehydrogenation effect is good.

The example of reductive agent comprises sulphite, S-WAT for example, hydrosulphite, sodium bisulfite for example, xitix or its salt, rongalite, dithionic acid or its salt, trolamine and cuprous sulfate.

The example of the preferably combination of superoxide and reductive agent comprises persulphate and sulphite, and persulphate and hydrosulphite.

Based on polysaccharide and monomeric total amount, the ratio of oxygenant is preferably 10-1000ppm, more preferably 20-500ppm, especially preferably 40-200ppm.Ratio less than 10ppm can cause insufficient dehydrogenation; Can make the amphiphilic polymers molecular weight that becomes too low greater than 1000ppm, the result can not show competent performance.

Based on polysaccharide and monomeric total amount, the preferred 10-1000ppm of the ratio of reductive agent, more preferably 20-500ppm.

When using the reductionoxidation polymerization initiator, preferred addition has polymerization promotor, for example based on inorganic metal, and the polymerization promotor of cuprous chloride and iron protochloride for example.

(3) Photoepolymerizationinitiater initiater

Preferred Photoepolymerizationinitiater initiater comprises ketal class Photoepolymerizationinitiater initiater and acetophenones Photoepolymerizationinitiater initiater, this be because they to polysaccharide have the dehydrogenation effect and advantageously with monomer-grafted to polysaccharide.In this case, the optics generation benzoyl radical that dissociates takes place, described benzoyl radical serves as the dehydrogenation agent.

The example of ketal class Photoepolymerizationinitiater initiater comprises 2,2-dimethoxy-1,2-phenylbenzene second-1-ketone and benzyl dimethyl ketal.

The example of acetophenones Photoepolymerizationinitiater initiater comprises diethoxy acetophenone, 4-(2-hydroxyl-oxethyl) phenyl-(2-hydroxyl-2-propyl group) ketone, 1-hydroxycyclohexylphenylketone, 2-methyl-2-morpholinyl (4-sulphomethyl phenyl) third-1-ketone, 2-benzyl-2-dimethylamino-1-(4-morpholinyl phenyl) butane, 2-hydroxy-2-methyl-1-phenyl third-1-ketone and 2-hydroxy-2-methyl-1-[4-(1-methyl ethylene) phenyl] and these oligopolymer.

Except above-claimed cpd, Photoepolymerizationinitiater initiater also can be bitter almond oil camphor class Photoepolymerizationinitiater initiater, thioxanthene ketone Photoepolymerizationinitiater initiater or the Photoepolymerizationinitiater initiater with polyalkylene oxide base, as opening described in (Kokai) No.2002-097236 the Japanese Patent spy.

Based on polysaccharide and monomeric total amount, the preferred 10-1000ppm of the ratio of Photoepolymerizationinitiater initiater, more preferably 20-500ppm, even more preferably 40-200ppm.The monomer that can cause insufficient dehydrogenation or residual quantity less than the ratio of 10ppm; Can make the amphiphilic polymers molecular weight that becomes too low greater than 1000ppm, the result can not show competent performance.

When using Photoepolymerizationinitiater initiater, also can be in conjunction with photosensitizers, wherein said photosensitizers is an example with the amido photosensitizers, comprising trolamine and methyldiethanolamine.

3) polymerization methods

Polymerization methods comprises aqueous polymerization, inverse suspension polymerization and inverse emulsion polymerization; Aqueous polymerization and inverse emulsion polymerization are preferred, because their easy operations.

When adopting aqueous polymerization, polysaccharide and monomer dissolve or are dispersed in the water-bearing media, in polymerization in the presence of polymerization starter under 10-100 ℃.As the dissolving of raw-material polysaccharide and monomer or be dispersed in the water, then when use they the time, join in the water-bearing media.

When adopting inverse emulsion polymerization, use wherein to stir and contain the polysaccharide and the monomeric aqueous solution, and be that the organic dispersion medium of the hydrophobic surfactant of 3-6 mixes with containing HLB, carry out emulsification, then under 10-100 ℃, polymerization in the presence of polymerization starter obtains the method for oil-in-water class (anti-phase) polymer emulsion.The example of organic dispersion medium comprises high boiling hydrocarbon solvent, for example solvent oil (mineral spirit).

Can optionally be set in polysaccharide and monomeric ratio in water-bearing media or the organic dispersion medium, and be preferably 20-70 weight % according to purpose.

According to the type of polymerization starter to be used, polymerization process can be photopolymerization, reductionoxidation polymerization or similar polymerization process.

Particularly, can be by adding polymerization starter to containing in polysaccharide and the monomeric aqueous solution or the reversed-phase emulsion, thus carry out polymerization process.

Polymerization process also can be the combination of photopolymerization and reductionoxidation polymerization.

When the control molecular weight, can use chain-transfer agent.The example of chain-transfer agent comprises mercaptan compound, for example mercaptoethanol and thiohydracrylic acid and reduction inorganic salt, for example S-WAT, sodium bisulfite and sodium hypophosphite.

In the present invention, preferred aqueous polymerization.In this case, preferably carry out polymerization under photoirradiation, this is because polymerization time is short and productive rate is good.

When carrying out polymerization under photoirradiation, UV-light and/or visible light can be used as exposure light; Preferred UV-light.

Consider monomeric type, the type of Photoepolymerizationinitiater initiater and/or photosensitizers or concentration, the molecular weight of interested amphiphilic polymers, polymerization time or the like decide the intensity of the intensity photoirradiation of photoirradiation, and usually preferred 0.5-1000W/m ², more preferably 5-400W/m ²

Light source can be a fluorescence chemical lamp for example, fluorescent blue lamp, metal halide lamp, or high voltage mercury lamp.

In the polyreaction under the photoirradiation, be not particularly limited the temperature of monomer solution, but typically preferred 5-100 ℃, more preferably 10-95 ℃, so that allow under the condition of gentleness, to carry out reposefully photopolymerization reaction.The preferred 5-15 of temperature when polymerization begins ℃, this is because obtain the high amphiphilic polymers of molecular weight, and removes easily and reduce phlegm and internal heat.

Can in batch technology or continuous processing, carry out the polyreaction under the photoirradiation monomer solution.

4) preferred polymerization process

The production method of amphiphilic polymers is the method for polymerizing cationically monomer and anionic monomer in the presence of polysaccharide, azo polymerization initiator and dehydrogenation agent wherein preferably, because this makes high molecular weight polymers be grafted on the polysaccharide, reduce residual monomer content, and provide when as flocculation agent, demonstrate the amphiphilic polymers of various good flocculation flocculations.

Azo polymerization initiator comprise above-mentioned those.

The example of dehydrogenation agent comprises redox dehydrogenation agent (RD dehydrogenation agent hereinafter referred to as) and Photoepolymerizationinitiater initiater class dehydrogenation agent (PT dehydrogenation agent hereinafter referred to as).Agent of RD dehydrogenation and the agent of PT dehydrogenation be dehydrogenation from polysaccharide not only, and serves as monomeric polymerization starter.

The agent of RD dehydrogenation is oxygenant and analogue preferably, the example of oxygenant comprise above-mentioned those.In the case, preferred combination is used it and reductive agent.

The agent of PT dehydrogenation is ketal class Photoepolymerizationinitiater initiater or acetophenones Photoepolymerizationinitiater initiater preferably, the example comprise above-mentioned those.

5) handle the gained amphiphilic polymers

Cut the amphiphilic polymers (it is generally gel form) that (chop) obtains by aqueous polymerization by the currently known methods weak point.By belt dryer, far-infrared dryer or similar moisture eliminator, be under 60-150 ℃ the temperature at the order of magnitude, the dry short polymkeric substance of cutting is ground into the efflorescence polymkeric substance by roller pulverizer etc., and carry out size control and randomly supplemented by additives or analogue before using it.

When in fact using the amphiphilic polymers that obtains by (anti-phase) letex polymerization, have the hydrophilic surfactant of high relatively HLB by interpolation, and dilute with water, thereby with its anti-phase O/w emulsion that changes into.

As amphiphilic polymers, preferably use the amphiphilic polymers of powder type.

With regard to 0.5% salinization viscosity (it is the index of molecular weight), the amphiphilic polymers preferred value is 10-200mPa.s, preferably when polymkeric substance during as described amphiphilic polymers flocculation agent subsequently, this numerical value more preferably drops in the 15-120mPa.s scope, 15-90mPa.s most preferably is so that obtain stable dehydration operation.

" the 0.5% salinization viscosity " mentioned in the present invention is meant the sample solution that obtains the 0.5wt% polymkeric substance by dissolving amphiphilic polymers in 4% sodium chloride aqueous solution, and by using the Brookfield viscometer under 60rpm, have rotor No.1 or 2, under 25 ℃, it is measured and the numerical value that obtains.

Amphiphilic polymers should contain graft copolymer as main component, and in described graft copolymer, monomer-grafted being aggregated on the polysaccharide comes from monomer but be not grafted to polymkeric substance on the polysaccharide but can contain.

2. composition

Composition of the present invention is to contain cationic monomer unit two classes different with the ratio of anionic monomer unit or the composition of multiclass amphiphilic polymers more, comprises that specifically the amphiphilic polymers (amphiphilic polymers (1) hereinafter referred to as) that satisfies following formula (1) is in conjunction with satisfying the amphiphilic polymers (amphiphilic polymers (2) hereinafter referred to as) of following formula (2) or satisfying the amphiphilic polymers (amphiphilic polymers (3) hereinafter referred to as) of following formula (3) and (4):

Ca ₁/An ₁≥1...(1)

Ca ₂/An ₂＜1...(2)

Ca ₃/An ₃≥1...(3)

|(Ca ₁-An ₁)-(Ca ₃-An ₃)|≥1.5...(4)

In formula (1)-(4), Ca ₁And An ₁Represent the total mole number of cationic monomer unit in amphiphilic polymers (1) and the total mole number of anionic monomer unit respectively, condition is that the total mole number of all the formation monomeric units in amphiphilic polymers (1) changes into 100mol; With above similar condition under, Ca ₂And An ₂Represent the total mole number of cationic monomer unit in amphiphilic polymers (2) and the total mole number of anionic monomer unit respectively; With above similar condition under, Ca ₃And An ₃Represent the total mole number of cationic monomer unit in amphiphilic polymers (3) and the total mole number of anionic monomer unit respectively.

Mention when comprising the present composition of amphiphilic polymers (1) and (2), said composition is the composition that wherein is used in combination Fuyang ionic amphiphilic polymers (1) and rich anionic amphiphilic polymers (2).

In the case, amphiphilic polymers (1) Ca wherein preferably ₁/ An ₁Be the polymkeric substance of 1.5-10.0, and amphiphilic polymers (2) Ca wherein preferably ₂/ An ₂Polymkeric substance for 0.5-0.9.

Next, when mentioning when comprising the present composition of amphiphilic polymers (1) and (3), said composition is wherein to be used in combination the two to be Fuyang ionic amphiphilic polymers but to constitute the composition that has big and little difference between monomeric unit and the negatively charged ion formation monomeric unit respectively at positively charged ion.

In the case, preferred Ca ₁/ An ₁Be 1.2-40.0, Ca ₃/ An ₃Be 1.2-40.0.

Preferably | (Ca ₁-An ₁)-(Ca ₃-An ₃) | be 1.5-40.0.If this numerical value less than 1.5, then usually can not get coming from blend and uses the high flocculating property that causes.

Can obtain amphiphilic polymers (1)-(3) by mode copolymerizable cationic monomers and anionic monomer with the ratio that satisfies above-described monomeric unit.

Can produce composition of the present invention by mixing amphiphilic polymers (1) and amphiphilic polymers (2) or amphiphilic polymers (3).Perhaps, in the sludge dewatering or paper technology of the following stated, can add each component independently.

For each amphiphilic polymers (1)-(3), can be used in combination or a class or two classes or multiclass more, yet, convenient and preferably for each aforesaid amphiphilic polymers (1)-(3), use a class.

Can set the ratio of each amphiphilic polymers in the composition according to purpose suitably.When composition comprised amphiphilic polymers (1) and (2), preferred use range was the amphiphilic polymers (1) of 40-90 weight % and the amphiphilic polymers (2) that use range is 60-10 weight %.

When composition comprised amphiphilic polymers (1) and (3), preferred use range was the amphiphilic polymers (1) of 10-90 weight % and the amphiphilic polymers (3) that use range is 90-10 weight %.

When using the amphiphilic polymers flocculation agent of powder type, preferably in use to wherein adding sodium pyrosulfate, sodium sulfate, thionamic acid or analogue.In use, but mixed flocculation agent and known additives, as long as it does not influence dehydration.

3. use

The composition that the present invention obtained can be applied on the various uses and especially can be used as polymer flocculant.As polymer flocculant, also can preferably use it as for example sludge dewatering agent and the paper grade (stock) reagent in paper technology, for example retention aid.

Polymer flocculant of the present invention especially can be used as sludge dewatering agent and retention aid.Below sludge dewatering agent and retention aid will be described.

3-1. the method for sludge dewatering agent and sludge dewatering

When polymer flocculant of the present invention was used as sludge dewatering agent (hereinafter being sometimes referred to as polymer flocculant), polymkeric substance was preferably powder or reversed-phase emulsion form.In actual applications, when polymkeric substance is powder, with powder dissolution in water, and as the aqueous solution.When polymkeric substance is reversed-phase emulsion, dilute with water it so that upset mutually, and use with the O/w emulsion form.

When using the sludge dewatering agent of powder type, preferably in use to wherein adding sodium pyrosulfate, sodium sulfate, thionamic acid or analogue.In use, can mix sludge dewatering agent and known additives, as long as it does not influence dehydration.

Sludge dewatering agent of the present invention can be applied to various mud, the mud of organic character for example, with contain the flocculation and the mud that mixes of sedimentation mud, and the analogue that is derived from sewage, human refuse and universal industrial waste water is on the mud of for example foodstuffs industry, chemical industry and paper pulp or paper industry.

Especially, can preferably sludge dewatering agent of the present invention be applied on the high mud of the ratio of little mud of fibre content and excess sludge.Specifically, can preferably sludge dewatering agent of the present invention be applied to ratio with regard to excess sludge more than or equal to 10SS%, more preferably on the mud of 20-50SS%.

Use the dewatering of the present invention of sludge dewatering agent of the present invention to be in particular wherein the sludge dewatering agent is joined in the mud, then mud is carried out dehydration method.

The sludge dewatering agent is joined in the mud, form the mud cotton-wool.Cotton-wool formation method can follow known method of the present invention.

Optionally, can additionally use inorganic flocculating agent,-ium compound, cationic polymer flocculent and anionic polymer flocculation agent.

The example of inorganic flocculating agent comprises Tai-Ace S 150, poly aluminium chloride, iron(ic) chloride, ferrous sulfate, polyiron sulfate and analogue.

-ium compound example comprises polymkeric substance polyamines, polyamidine, cats product and analogue.

Add therein under the situation of inorganic flocculating agent or organic-flocculation immunomodulator compounds, preferably regulate pH to 4-8, this is because can handle mud effectively.

About the pH regulator method, when after adding inorganic flocculating agent or organic floculant, obtaining suitable pH, do not need special pH regulator; Yet, when each satisfies the pH scope of stipulating among the present invention, can add acid or alkali for adjusting.

The example of acid comprises hydrochloric acid, sulfuric acid, acetate, thionamic acid and analogue.In addition, the example of alkali comprises caustic soda, Ke Xingjia, ammoniacal liquor and analogue.

The example of cationic polymer flocculent comprises the multipolymer of the homopolymer of above-described cationic monomer, above-described cationic monomer and non-ionic monomer, and analogue.

The example of anionic polymer flocculation agent comprises the multipolymer of above-described anionic monomer of the homopolymer of above-described anionic monomer and non-ionic monomer, and analogue.

With respect to mud, the preferred 5-500ppm of the ratio of the polymer flocculant that is added and with respect to SS, its ratio is preferably 0.05-1 weight %.When being used in combination polymer flocculant and another polymer flocculant, the total amount of preferably all polymer flocculant satisfies above-described ratio.

Employed dehydration conditions in the prior art is abideed by in the addition of sludge dewatering agent and other flocculation agent, stirring velocity, churning time or the like suggestion.

By operation well known in the art, make the cotton-wool dehydration of formation like this, form the cake of dehydration.

The example of water extracter comprises screw rod extruding-desiccation machine, belt extruding-desiccation machine, filters extruding-desiccation machine, screw rod decantor and analogue.

In addition, sludge dewatering agent of the present invention may be used on using the granulation with filter element and concentrates with on the dewatering of container.

Specifically; the example of dewatering comprises that wherein inorganic flocculating agent joins in the mud; then or after further adding the sludge dewatering agent or adding the sludge dewatering agent together; mud is incorporated into granulation and concentrated using in the container with filter element; from filter element, take out filtrate; carry out granulation simultaneously, and the material of granulation is carried out dehydration method by water extracter.

3-2. retention aid and papermaking process

When composition of the present invention was used as retention aid, polymkeric substance was preferably powder or reversed-phase emulsion form.In actual applications, as mentioned above, when polymkeric substance is powder, powder dissolution in water, and is used with aqueous solution form, perhaps when polymkeric substance is reversed-phase emulsion, dilute with water it so that upset mutually, and with O/w emulsion dilution use.In both cases, solids content is preferably 0.01-0.5 weight %, more preferably 0.01-0.1 weight %.

The papermaking process that uses the present composition can be the method according to routine, and can carry out papermaking then, thereby carry out by adding composition of the present invention in raw material.

The method of adding retention aid can be according to conventional methods, and its mode for example makes adds auxiliary agent when raw material is diluted to ultimate density when being incorporated in the paper machine, perhaps adds auxiliary agent after diluting.

Be included in those that use in the common paper technology to the raw material that wherein applies retention aid, and contain paper pulp and filler at least usually, randomly the additive except filler specifically comprises sizing agent, fixing agent, paper strength agent, tinting material and analogue.

Preferably retention aid of the present invention is applied in the paper pulp, described paper pulp is by with respect to a high proportion of waste paper of whole paper pulp, and for example deinked waste paper constitutes.In addition, retention aid of the present invention can preferably be applied in the high papermaking systems of filler content, neutral papermaking systems and the high speed papermaking systems.

The example of filler comprises vitriol, barium sulfate, zinc oxide, titanium oxide and the analogue of clay, kaolin, agalite, talcum, lime carbonate, magnesiumcarbonate, lime.The example of sizing agent comprises vinylformic acid-styrol copolymer and analogue, and the example of fixing agent comprises Tai-Ace S 150, cationic starch, alkyl ketene dimer and analogue; Comprise starch, positively charged ion or amphiprotic polyacrylamide and analogue with the example of paper strength agent.

With respect to the dry pulp weight in raw material, the ratio of retention aid to be added is preferably 0.005-0.8 weight %, more preferably 0.005-0.5 weight %.

The pH value of raw material is kept preferred 5-10, more preferably 5-8 after adding retention aid.Just after adding retention aid, raw material is incorporated in the paper machine.

The invention effect

When composition of the present invention is used as polymer flocculant, agent is used for all kinds of mud to composition as sludge dewatering, with regard to various dewaterings, but especially with regard to flocculence, that is, is good in flocculation aspect the growth of cotton-wool and the maintenance thereof in mixing tank, and the filtration velocity of gained cotton-wool height and self-supporting and rippability are good.

In addition, composition of the present invention can be used as the retention aid of single packaging type, and the retention aid of described single packaging type is insensitive to where and when adding it in papermaking process, and makes the reservation balance well of the formation of paper and paper technology.

Implement optimal mode of the present invention

The present invention relates to contain the composition of multiple amphiphilic polymers, wherein multiple amphiphilic polymers comprises the combination of amphiphilic polymers (1) and amphiphilic polymers (2), perhaps the combination of amphiphilic polymers (1) and amphiphilic polymers (3).

Composition of the present invention is preferably used as the amphiphilic polymers flocculation agent.

Polymer flocculant can be preferably used as sludge dewatering agent or retention aid.

When composition when the sludge dewatering agent, use it for preferably wherein that the sludge dewatering agent joins in the mud, the sludge dewatering technology of dewatering then.When composition when the retention aid, use it for preferably wherein that retention aid joins in the raw material, carry out the paper technology of papermaking then.

Embodiment

Reference example and Comparative Examples below will more specifically be described the present invention.

In following specification sheets, " % " is meant that weight % and " part " are meant weight part.

Production example 1

Introducing total amount in the stainless steel reaction bottle is the aqueous solution (hereinafter referred to as " DAC ") of the dimethyl amino ethyl acrylate methyl chloride quaternary salt of 760g, acrylic acid aqueous solution (hereinafter referred to as " AA "), with the aqueous solution (hereinafter referred to as " AM ") of acrylamide, so that the mol ratio of DAC/AA/AM is that 42/5/53 (weight ratio of DAC/AA/AM is 66.3/3.0/30.7) and solids content are 56%.

(Ace KT-245 is available from OjiCornstarch Co., Ltd. with ion exchanged water dilution amphoteric starch slurries; Solids content: be less than or equal to 22%; Hereinafter referred to as " KT-245 ") solids content to 5%, and under 80 ℃, further heat and boiling 30 minutes, obtain solids content and be 6% amphoteric starch slurries.Introducing content is the gained amphoteric starch slurries of 213g, and this is equivalent to the total amount with respect to monomer and starch, is 3% with regard to its solids content.In addition, add the 20g ion exchanged water, the solids content to 43% and the gross weight of regulating all monomers and starch are 1.0kg, then stir and dispersion.

Subsequently, regulate the temperature of emulsion to 10 ℃, through 60 minutes nitrogen is blown in the solution simultaneously.Then, solid weight based on all monomers and starch, add azo bisamide propane hydrochloride salt (V-50 hereinafter referred to as), cuprous chloride, ammonium persulphate and sodium bisulfite that concentration is respectively 1000ppm, 0.3ppm, 30ppm and 30ppm, then be arranged in the blackout of the 100W on the reaction flask, at 6.0mW/cm by use ²Irradiation intensity under irradiation 60 minutes, carry out polymerization, obtain the water-soluble amphiphilic polymers of form of hydrogels.

From bottle, take out the gained amphiphilic polymers, and the same with embodiment 1 dry and pulverize, obtain the powder amphiphilic polymers.This amphiphilic polymers is called as SCR-1.

Measure the salinization viscosity of gained amphiphilic polymers.The result has been shown in the table 1.

Production example 2-8

Produce water-soluble polymers in the mode identical with production example 1, component to be used that different is and ratio become those shown in the following table 1.In production example 4-8, do not use starch, but only use monomer.

Measure the salinization viscosity of gained water-soluble polymers 0.5%.The result has been shown in the table 1.

Table 1

1) ratio with respect to starch and monomeric total amount

Embodiment 1 (as the sludge dewatering agent)

As amphiphilic polymers, use 70 parts of SCR-1 and 30 parts of SAR-1, and be mixed together, produce composition, described composition is as polymer flocculant (hereinafter referred to as " SBL-1 ").

Take a sample 200 milliliters of (200ml) paper sludges (SS:38,200mg/l VSS:21700mg/l, fibre content: 580mg/l) and place in the 300ml beaker, and by using 100rpm three one motor stirring down 60 seconds.Then, the aqueous solution of 0.2% polymer flocculant that is added in an amount of 80ppm in mud, then by using 100rpm three one motor down to stir 60 seconds, the formation cotton-wool.This moment, but estimate the flocculence of cotton-wool, and measure the diameter of gained cotton-wool based on the Three Estate of the following stated.

Afterwards, the filter cloth of a slice 80 mesh sizes is installed in the Nutsche funnel, then right circular cylinder body thereon.Then, above-described mud cotton-wool suspension is poured in the right cylinder for gravity filtration.The volume of measurement filtrate after 10 seconds time lapses is considered as filtration velocity with it.In addition, the outward appearance of visual inspection gained filtrate, and based on the Three Estate evaluation of the following stated.After filtering, remove right cylinder, and estimate the gained cake based on the Three Estate of the following stated.

Evaluation result has been shown in the table 3.

But flocculence

Good: in case stir, form large diameter cotton-wool immediately, cotton-wool is difficult to cave in simultaneously.

Well: in case when stirring, form large diameter cotton-wool immediately, cotton-wool caves in easily simultaneously.

Difference: even after continuing stirring, only form the cotton-wool of minor diameter, and gained cotton-wool (if any) caves in by stirring easily.

The outward appearance of filtrate

Good: transparent fully

Well: the solid of finding trace suspension.

Difference: find a large amount of solids that suspend.

Self-supporting

Good: cake is supported oneself fully

Well: cake caves in slightly.

Difference: cake caves in fully.

Comparative Examples 1 and 2 (as the sludge dewatering agent)

As polymer flocculant, with the composition (BL-1) shown in the mode production following table 2 identical with embodiment 1.

Carry out the dehydration of mud in the mode identical with embodiment 1, different is that the flocculation agent shown in the table 3 is as polymer flocculant.

Illustrated in the table 3 and shown the evaluation result that obtains in the mode identical with embodiment 1.

Table 2

Table 3

Find that the polymer flocculant among the embodiment is good at various sludge dewatering aspect of performances.

On the other hand, the polymer flocculant BL-1 of Comparative Examples 1 (it is the blend identical with SBL-1, and different is not have treated starch) obtains stirring the cotton-wool that caves in easily by continuation, and final various dewatering deficiency.The polymer flocculant CO-1 of Comparative Examples 2 (it has the monomer identical with SBL-1 forms, but is made up of the single amphiphilic polymers of starch conversion of no use) but flocculence difference and various dewatering deficiency.

Embodiment 2 (as the sludge dewatering agent)

As amphiphilic polymers, use 50 parts of SCR-1 and 50SCR-2, and be mixed together, produce composition.Described composition is as polymer flocculant (hereinafter referred to as " SBL-2 ").

Form cotton-wool in the mode identical with embodiment 1, different is to use 200ml paper sludge (SS:13600mg/l, VSS:10000mg/l, fibre content: 4100mg/l), and the aqueous solution of 0.2% polymer flocculant that is added in an amount of 30ppm is in mud.

The evaluation result that obtains in the mode identical with embodiment 1 has been shown in the table 5.

Comparative Examples 3 and 4 (as the sludge dewatering agent)

As polymer flocculant, with the composition (BL-2) shown in the mode production following table 4 identical with embodiment 2.

Carry out sludge dewatering in the mode identical with embodiment 2, different is that the flocculation agent shown in the table 5 is as polymer flocculant.

The evaluation result that obtains in the mode identical with embodiment 2 has been shown in the table 5.

Table 4

Table 5

The various dewaterings of the polymer flocculant of discovery embodiment are good.

On the other hand, the polymer flocculant BL-2 of Comparative Examples 3 (it is the blend identical with SBL-2, and different is not have treated starch) obtains stirring the cotton-wool that caves in easily by continuation, and final various dewatering deficiency.The polymer flocculant C-1 of Comparative Examples 4 (it has the monomer identical with SBL-2 forms, but is made up of the single amphiphilic polymers of starch conversion of no use) but flocculence difference and various dewatering deficiency.

Embodiment 3 (as retention aid)

As retention aid, use the aqueous solution that contains 0.05 weight %SBL-1.

The solids content that use is made up of the kraft pulp (50SS%) (the two is all pulverized and pulls an oar) of deinked waste paper (50SS%) and the leaf of comforting oneself tree is 1% pulp slurry (starting material pulp slurry hereinafter referred to as).About this point, according to JIS P 8121, pulverize deinked waste paper becomes 350ml with paper pulp Canadian Standard Freeness (CSF hereinafter referred to as), different is to use 1% sample.

In the starting material pulp slurry with this order under 30 seconds interval, under the stirring of 1000rpm, add following component (1)-(5), and measure total retention rate by Dynamic Emission jar method.The formation of evaluation paper as described below: use retention aid adding pulp slurry wherein, before using square based sheet mechanical presses machine extruding, use available from Kumagai Riki KogyoCo., the square class bronze screen cloth of Ltd. carries out papermaking.Then, in automatic dryer, after 100 ℃ of following dryings, adopt the shaping test machine, measure the shaping index (index is big more, and it is good more then to be shaped) of gained paper.

The gained result has been shown in the table 6.The final pH value of pulp slurry is 7.9.

(1) light calcium carbonate: 20% (with respect to the ratio of the paper pulp solids content in the pulp slurry, hereinafter referred to as " with respect to paper pulp ")

(2) cationic starch: 0.3% (" with respect to paper pulp ")

(3) Tai-Ace S 150: 1.7% (" with respect to paper pulp ")

(4) paper strength agent (15% the aqueous solution of the multipolymer of making by DAC/AA/AM=20/10/70 (mol ratio), viscosity: 3500mPa.s): 0.5%

(5) retention aid: 250ppm (with respect to paper pulp)

Comparative Examples 5 and 6 (as retention aid)

Estimate the performance of retention aid in the mode identical with embodiment 3, those that different are to use shown in the table 4 are as retention aid.The gained result has been shown in the table 4.

Table 6

The result of table 6 shows that retention aid of the present invention is all good aspect total retention rate and shaping two, but Comparative Examples 5 and 6 deficiency aspect total retention rate or shaping.

Embodiment 4 (as retention aid)

Carry out papermaking and evaluation in the mode identical with embodiment 3, different is to use the aqueous solution of 0.05 weight %SBL-2 as retention aid, and to use the solids content of being made up of deinked pulp (100%SS) be 1% pulp slurry, and described deinked pulp is by pulverizing and the waste paper of the deinking of pulling an oar obtains.

The gained result has been shown in the table 7.The final pH value of pulp slurry is 7.9.

Comparative Examples 7 and 8 (as retention aid)

Estimate the performance of retention aid in the mode identical with embodiment 4, those that different are to use shown in the table 7 are as retention aid.The gained result has been shown in the table 7.

Table 7

The result of table 7 shows that retention aid of the present invention is all good aspect total retention rate and shaping, but Comparative Examples 7 and 8 or total retention rate or shaping aspect deficiency.

Industrial applicibility

Composition of the present invention can be preferably used as polymer flocculants and especially be preferably used as mud Dehydrating agent or retention agent.

Claims (7)

1. composition, it comprises by in the presence of polysaccharide, polymerisable monomer of polymerizing cationically free radical and the polymerisable monomer of radical anion and the multiple amphoteric water-soluble polymer that obtains, wherein the polymerisable monomer of this radical cation is the hydrochloride or the vitriol of acrylic or methacrylic acid dialkyl aminoalkyl ester, the hydrochloride of dialkyl aminoalkyl acrylamide or Methacrylamide or vitriol, or the quaternary salt of acrylic or methacrylic acid dialkyl aminoalkyl ester, the polymerisable monomer of this radical anion is unsaturated carboxylic acid and/or its salt, and this multiple polymers is made of amphiphilic polymers that satisfies following formula (1) (1) and the amphiphilic polymers (3) that satisfies the amphiphilic polymers (2) of following formula (2) or satisfy following formula (3) and (4) basically:

Ca ₁/An ₁≥1 ...(1)

Ca? ₂/An ₂＜1 ...(2)

Ca ₃/An? ₃≥1 ...(3)

|(Ca ₁-An ₁)-(Ca? ₃-An? ₃)|≥1.5 ...(4)

Wherein in formula (1)-(4), Ca ₁And An ₁Represent the total mole number of cationic monomer unit in amphiphilic polymers (1) and the total mole number of anionic monomer unit respectively, condition is that the total mole number of all the formation monomeric units in amphiphilic polymers (1) changes into 100mol; With above similar condition under, Ca ₂And An ₂Represent the total mole number of cationic monomer unit in amphiphilic polymers (2) and the total mole number of anionic monomer unit respectively; With above similar condition under, Ca ₃And An ₃Represent the total mole number of cationic monomer unit in amphiphilic polymers (3) and the total mole number of anionic monomer unit respectively.

2. according to the composition of claim 1, wherein the monomer of cationic polymerizable is the quaternary salt of acrylic or methacrylic acid dialkyl aminoalkyl ester.

3. polymer flocculant, it comprises the composition of claim 1.

4. sludge dewatering agent, it comprises the polymer flocculant of claim 3.

5. make the method for sludge dewatering, this method comprises that the sludge dewatering agent of adding claim 4 in mud, dewaters then.

6. retention aid, it comprises the polymer flocculant of claim 3.

7. papermaking process, it comprises the retention aid that adds claim 6 in raw material, carries out papermaking then.