WO2005054316A1 - 水溶性高分子の製造方法 - Google Patents
水溶性高分子の製造方法 Download PDFInfo
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- WO2005054316A1 WO2005054316A1 PCT/JP2004/017936 JP2004017936W WO2005054316A1 WO 2005054316 A1 WO2005054316 A1 WO 2005054316A1 JP 2004017936 W JP2004017936 W JP 2004017936W WO 2005054316 A1 WO2005054316 A1 WO 2005054316A1
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F251/00—Macromolecular compounds obtained by polymerising monomers on to polysaccharides or derivatives thereof
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F2/00—Processes of polymerisation
- C08F2/38—Polymerisation using regulators, e.g. chain terminating agents, e.g. telomerisation
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L51/00—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
- C08L51/02—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers grafted on to polysaccharides
Definitions
- the present invention relates to a method for producing a water-soluble polymer in which a water-soluble monomer is polymerized in the presence of a polysaccharide.
- Polymers can be awarded in various technical fields such as flocculants, sludge dewatering agents, retention aids and thickeners.
- water-soluble polymers particularly high-molecular-weight water-soluble polymers, have been used in various technical fields such as polymer flocculants, retention aids and thickeners.
- a starch-modified polymer or a method for producing the same is a polymer having a specific cation-etherified starch as a trunk polymer, a quaternary ammonium-modified cationic group on a graft side chain, and a specific viscosity.
- Patent Literature 1 a polysaccharide trunk polymer grafted with a copolymer of (meth) acrylamide and (meth) acrylic acid or a salt thereof as a side chain
- Patent Literature 2 a polysaccharide trunk polymer grafted with a copolymer of (meth) acrylamide and (meth) acrylic acid or a salt thereof as a side chain
- Patent Document 3 A method in which an aqueous solution of a water-soluble gel of a copolymer obtained by graft-polymerizing a water-soluble monomer in an aqueous solvent is added to an organic solvent to precipitate into a powder form.
- Patent Document 3 There is a method of producing dimethylaminoethyl metharylate quaternary salt using a redox polymerization initiator or a cerium-based polymerization initiator (Non-Patent Document 1) and the like.
- Patent Document 1 Japanese Patent Publication No. 62-21007 (Claims)
- Patent Document 2 JP-A-6-254306 (Claims)
- Patent Document 3 JP-A-8-41212 (Claims)
- Non-patent document 1 The Chemical Society of Japan, 1976, 10 volumes, 1625-1630
- the method for producing a starch-modified polymer as disclosed in Patent Document 3 requires a reprecipitation operation in a solvent or the like, so that there is a problem that the process becomes complicated and the cost increases. Furthermore, in the method for producing a starch-modified polymer disclosed in Non-Patent Document 1, in addition to the problem that the amount of residual monomer increases, grafting becomes insufficient. Otherwise, it was sometimes separated into two layers with the polymer.
- the present inventors have found that when a water-soluble polymer which can be easily produced, a high-molecular-weight polymer can be grafted onto starch, and the amount of residual monomer is small, and is used as a flocculant, We conducted intensive studies to find a method for producing water-soluble polymers with excellent coagulation performance.
- a polysaccharide is polymerized with a water-soluble monomer containing a cationic monomer as an essential component in the presence of a specific polymerization initiator and a hydrogen abstracting agent.
- the present inventors have found that the manufacturing method is effective and completed the present invention.
- acrylate or methacrylate is represented as (meth) acrylate
- acrylic acid or methacrylic acid is represented as (meth) acrylic acid
- acrylamide or methacrylamide is represented as (meth) acrylamide.
- the method for producing a water-soluble polymer of the present invention includes a method for preparing a cationic radical polymerizable monomer (hereinafter simply referred to as a cationic monomer) in the presence of a polysaccharide, an azo-based polymerization initiator, and a hydrogen abstraction agent.
- the present invention relates to a method for producing a water-soluble polymer by polymerizing a water-soluble radically polymerizable monomer (hereinafter simply referred to as a water-soluble monomer).
- polysaccharide Various substances can be used as the polysaccharide in the present invention.
- natural polysaccharides include starch.
- starch Specifically, potato starch, waxy potato starch, sweet potato starch, waxy corn starch, high amylose corn starch, small barley starch, rice starch, tapio starch , Sago starch, glumannan and galactan, as well as raw starch such as wheat flour, corn flour, dried sweet potatoes and dried tapioc power.
- raw starch such as wheat flour, corn flour, dried sweet potatoes and dried tapioc power.
- starch is preferred, and specific examples thereof include those described above.
- Potato starch, waxy potato starch, sweet potato starch, waxy corn starch, high amylose corn starch, wheat starch, rice starch , Tapioric starch, sago starch, glumannan, galactan and the like are preferred.
- a modified starch obtained by modifying chemically or enzymatically can be used.
- examples of the katakana method include oxidation, esterification, etherification, and acid treatment.
- polysaccharide in the present invention those obtained by subjecting the above-mentioned polysaccharide to cationic or amphoteric polymerization by an ordinary method are excellent in copolymerizability with a water-soluble monomer described later, and are used as a flocculant. It is preferable because of its excellent performance.
- the cationization of the polysaccharide may be performed according to a conventional method.
- Examples of the cationization include a method of treating a raw starch with a cationizing agent.
- a cationizing agent include tertiary amines such as getylaminoethyl chloride, and 3 —Cross mouth— Quaternary ammonium salts such as 2-hydroxypropyltrimethylammonium-dimethyl chloride and glycidyltrimethylammonium-dimethyl chloride.
- the degree of cation substitution of the cationized polysaccharide is preferably 0.01 to 0.06 mass Z in terms of nitrogen atom, more preferably 0.02 to 0.66 mass Z in mass. is there.
- the polysaccharide may be one that has undergone a known reaction after cationization.
- an amphoteric polysaccharide that has undergone an Aon-Dani reaction may be used.
- Specific examples of the ionization reaction include phosphoric esterification with inorganic phosphoric acid and the like; urea phosphoric acid and acid hypochlorite, etc .; And the like
- the polysaccharide is preferably used as a size liquid, it is preferable to use a polysaccharide that has been subjected to cooking.
- cooking is a method of heating a polysaccharide to a gelatinization temperature or higher.
- the heating temperature in this case may be appropriately set according to the type of starch used, but is preferably 70 ° C. or higher.
- Starch can be cooked either by a notch or a continuous method.
- the viscosity of the starch paste solution used is preferably a solid content concentration of 10 to 40% by mass, and a value of 100 to 100 mPa's measured at 25 ° C with a B-type viscometer.
- the size liquid of the polysaccharide used in the present invention is preferably diluted with water to form a slurry of 3 to 10% by mass.
- the paste liquid of the polysaccharide to be used has aged and solidified or has a poor dispersibility in water
- a cooking method in this case the same method as described above can be used.
- the water-soluble monomer in the present invention essentially comprises a cationic monomer.
- cationic monomer various compounds can be used as long as they have radical polymerizability. Specifically, dimethylaminoethyl (meth) acrylate, getylaminoethyl (meth) acrylate and dimethyl Aminoethyl (meth) atalylate and getylamino-2
- Tertiary salts of dialkylaminoalkyl (meth) acrylates such as hydrochlorides and sulfates; Tertiary salts of dialkylaminoalkyl (meth) acrylamides, such as dimethylaminoethyl (meth) acrylamide Salts; quaternary salts such as halogenated alkyl adducts such as methyl chloride adduct of dialkylaminoalkyl (meth) acrylate and halogenated aryl adducts such as benzyl chloride adduct; and dialkylaminoalkyl (meth) Examples include quaternary salts such as alkyl halide adducts such as methyl chloride adduct of acrylamide and halogenated aryl reel adducts such as benzyl chloride adduct.
- halogenated alkyl adducts of dialkylaminoalkyl (meth) acrylates are more preferred, with quaternary salts of dialkylaminoalkyl (meth) acrylates being preferred.
- an a-on radical polymerizable monomer hereinafter referred to as an anionic monomer and! ⁇ ⁇
- a nonionic radical polymerizable monomer hereinafter, referred to as a non-ionic monomer
- Various compounds can also be used as the a-on monomers as long as they have radical polymerizability.
- unsaturated carboxylic acids such as (meth) acrylic acid, crotonic acid, itaconic acid and maleic acid can be used.
- salts thereof. Salts include ammonium salts and alkali metal salts such as sodium and potassium.
- (meth) acrylic acid is preferred.
- non-ionic monomer examples include (meth) acrylamide, dimethyl (meth) acrylamide, getyl (meth) acrylamide, hydroxylethyl (meth) atalylate, and methoxy (meth) ately added with ethylene oxide.
- (meth) acrylamide is preferred.
- a water-soluble monomer may be used in combination with another monomer.
- the monomer include methoxyethyl (meth) acrylate, butoxyshethyl (meth) acrylate, ethyl carbitol (meth) acrylate, methyl (meth) acrylate, ethyl (meth) acrylate, and butyl acetate. Is mentioned.
- the ratio between the polysaccharide and the water-soluble monomer is
- the water-soluble monomer is preferably 50% by mass or more based on the total amount of all the monomers, and more preferably 50-99% by mass.
- the proportion of the water-soluble monomer is less than 50% by mass, the obtained polymer becomes insoluble in water, or when the obtained polymer is used as an aggregating agent, a large amount of the polymer may be lost. May not be obtained.
- the water-soluble monomer used in the present invention essentially comprises a cationic monomer.
- the preferable ratio is 10 to 99% by mass, more preferably 30 to 90% by mass, based on all the water-soluble monomers.
- an azo-based polymerization initiator is used.
- the azo polymerization initiator functions not only as a polymerization initiator for water-soluble monomers, but also for reducing the amount of residual monomers.
- azo-based polymerization initiator various compounds can be used.
- specific examples of the azo-based polymerization initiator include 4,4'-azobis (4-cyanovaleric acid) (a 10-hour half-life temperature of 69 ° C).
- azo-based polymerization initiators have high solubility in water, do not contain insoluble components! / Or have a low content! /, And produce water-soluble polymers.
- As a azo-based polymerization initiator it has a 10-hour half-life temperature of 50 ° C or more because it produces high-molecular-weight water-soluble polymers and the amount of unreacted monomers in water-soluble polymers is small.
- Compounds preferred 50-90 ° C compounds are more preferred
- Compounds at 50-70 ° C are more preferred.
- azo polymerization initiator examples include 4,4'-azobis (4-cyanovaleric acid) (69 ° C), 2,2, -azobis [N- (2carboxyethyl)- 2 Methylpropionamidine] hydrochloride (57.C), 2,2, azobis ⁇ 2-Methyl-N— [2- (1-hydroxybutyl)] propionamide ⁇ (80 ° C), 2,2, azobis [2-Methyl-N- (2-hydroxyethyl) propionamide] (86 ° C), 2, 2'-azobis (2 amidinopropane) hydrochloride (56 ° C), 2, 2'-azobis [2 — (3,4,5,6-tetrahydropyrimidine 2-yl) propane] hydrochloride (58 ° C), 2,2, azobis ⁇ 2- [1- (2-hydroxyethyl) -2-imidazoline 2- Yl] propane ⁇ hydrochloride (60 ° C) and 2,2,2-2-
- the azo-based polymerization initiator is preferably used in an amount of 50 to 5000 ppm, more preferably 100 to 3000 ppm, and still more preferably, based on the total amount of the polysaccharide and the water-soluble monomer. Or 300—100 ppm.
- the ratio of the azo polymerization initiator used is less than 50 ppm, the polymerization is incomplete and the residual monomer increases, while when it exceeds 5000 ppm, the obtained aqueous polymer becomes a low molecular weight polymer.
- a hydrogen abstracting agent is used to preferably graft copolymerize a water-soluble monomer to a polysaccharide.
- Examples of the hydrogen abstracting agent include a redox-based hydrogen abstracting agent (hereinafter, referred to as an RD abstracting agent) and a photopolymerization initiator-based hydrogen abstracting agent (hereinafter, referred to as a PT abstracting agent).
- the RD abstracting agent and the PT abstracting agent function to extract polysaccharide hydrogen and also function as a polymerization initiator for water-soluble monomers.
- a peroxide is preferable.
- Sodium persulfate as sodium persulfate, Persulfates such as potassium persulfate and ammonium persulfate; organic peroxides such as benzoyl peroxide, t-butyl peroxide, peroxide and succinic peroxide; hydrogen peroxide; and bromic acid Sodium and the like.
- persulfates are preferred because of their excellent hydrogen abstraction effect even at low temperatures at the start of polymerization.
- an organic peroxide When an organic peroxide is used, it is preferable to use a reducing agent in combination, since the radical generation of the organic peroxide can be facilitated and the hydrogen extraction effect can be made effective.
- the peroxide generates peroxide radicals by the reducing agent, which causes hydrogen abstraction of the polysaccharide.
- reducing agent examples include sulfites such as sodium sulfite, bisulfites such as sodium bisulfite, ascorbic acid and its salts, Rongalit, -thionic acid and its salts, triethanolamine, and cuprous sulfate.
- Preferable combinations of the acid peroxide and the reducing agent include persulfate and sulfite, and persulfate and bisulfite.
- the ratio of the RD extracting agent to the total amount of the polysaccharide and the water-soluble monomer is preferably 10 to 100 ppm, more preferably 20 to 500 ppm, and particularly preferably 20 to 200 ppm. ppm. If this ratio is less than 10 ppm, hydrogen extraction will be insufficient, while if it exceeds 1 OOOppm, the molecular weight of the water-soluble polymer will be small and sufficient performance may not be exhibited.
- the ratio of the reducing agent is preferably 10- ⁇ pm based on the total amount of the polysaccharide and the water-soluble monomer, and more preferably 20-500 ppm.
- a ketal-type photopolymerization initiator and an acetophenone-type photopolymerization initiator are preferable.
- photocleavage occurs to generate a benzoyl radical, which functions as a hydrogen abstracting agent.
- ketal-type photopolymerization initiator examples include 2,2-dimethoxy-1,2-diphenyl-1-ethane and benzyldimethylketal.
- acetophenone type photopolymerization initiator examples include ethoxy acetophenone, 4- (2-hydroxyethoxy) phenyl (2-hydroxy-2-propyl) ketone, 1-hydroxycyclohexyl phenyl ketone, and 2-methyl-2 Morpholino (4-thiomethylphenol) propane 1 on, 2 —Benzyl-2-dimethylamino-1- (4-morpholinophenyl) butane, 2-hydroxy-2-methyl-1-phenylpropane 1one and 2-hydroxy-2-methyl-1-one [4- (1-methylvinyl) phenyl ] And the like.
- a photopolymerization initiator having a polyalkylene oxide group as described in JP-A-2002-097236, can also be used.
- the ratio of the PT extracting agent is 10-1 to the total amount of the polysaccharide and the water-soluble monomer.
- OOOppm power S is preferred, more preferably 20-500 ppm, and still more preferably 20-200 ppm. If the amount is less than lOppm, the hydrogen extraction may be insufficient or the residual monomer may increase. If the amount exceeds lOOppm, the molecular weight of the water-soluble polymer may be reduced and the performance may not be exhibited.
- an azo-based polymerization initiator and a hydrogen abstracting agent are essential.
- Other polymerization initiators, polymerization accelerators, and the like can be used in combination as needed.
- photopolymerization initiators other than the above-mentioned ketal-type and acetophenone-type photopolymerization initiators can be used.
- a photosensitizer such as an amine-based photosensitizer such as triethanolamine and methyljetanolamine can be used in combination.
- the ratio of the above-mentioned PT to the water-soluble monomer is The same proportions as for the bow I puller are preferred.
- an inorganic metal-based polymerization accelerator such as cupric chloride and ferrous chloride as the polymerization accelerator.
- the polymerization accelerator is preferably added in an amount of 0.1 to 1 ppm based on the total amount of the polysaccharide and the water-soluble monomer.
- the present invention is a method for producing a water-soluble polymer in which a water-soluble monomer essentially including a cationic monomer is polymerized in the presence of a polysaccharide, an azo-based polymerization initiator, and a hydrogen abstracting agent.
- a water-soluble monomer essentially including a cationic monomer is polymerized in the presence of a polysaccharide, an azo-based polymerization initiator, and a hydrogen abstracting agent.
- a high-molecular-weight polymer can be grafted onto a polysaccharide, and the obtained water-soluble polymer having a small amount of residual monomer can be aggregated. It is presumed that the reason for excellent coagulation performance when used as an agent is as follows.
- the hydrogen abstracting agent can also abstract the skeleton of the polysaccharide by hydrogen, and can be used as a starting point for graft-polymerizing the water-soluble monomer to the polysaccharide.
- the hydrogen abstracting agent functions as a polymerization initiator. It can promote the growth of the backbone of the monomer.
- azo-based polymerization initiators generate radicals at high temperatures, so that the water-soluble monomer becomes a high molecular weight polymer. This consumes residual monomer.
- Examples of the polymerization method include aqueous solution polymerization, reverse phase suspension polymerization, reverse phase emulsion, and the like.
- Aqueous solution polymerization and reverse phase emulsion are more preferable, and aqueous solution polymerization is more preferable in terms of easy handling. .
- the polysaccharide and the water-soluble monomer are dissolved or dispersed in an aqueous medium and polymerized at 10 to 100 ° C in the presence of a polymerization initiator.
- the raw materials, polysaccharides and water-soluble monomers, dissolved or dispersed in water, are used after being added to an aqueous medium.
- an aqueous solution containing a polysaccharide and a monomer and an organic dispersion medium containing a hydrophobic surfactant having an HLB of 3-6 are mixed by stirring and emulsified. Then, polymerization is carried out at 10-100 ° C. in the presence of a polymerization initiator to obtain a water-in-oil (reverse phase) polymer emulsion.
- Organic dispersion media include high-boiling materials such as mineral spirits. Point hydrocarbon solvents and the like.
- the ratio of the polysaccharide and the monomer in the aqueous medium or the organic dispersion medium may be appropriately set according to the purpose, and is preferably 20 to 70% by mass.
- photopolymerization and redox polymerization may be performed according to the type of the polymerization initiator used.
- an RD abstracting agent when used as a hydrogen abstracting agent, an azo-based polymerization initiator and an RD abstracting agent are added to an aqueous solution containing a polysaccharide and a water-soluble monomer.
- an azo-based polymerization initiator and a PT abstracting agent can be added to an aqueous solution containing a polysaccharide and a water-soluble monomer, and then irradiated with light. good.
- photopolymerization and redox polymerization can be used in combination.
- a chain transfer agent When adjusting the molecular weight, a chain transfer agent may be used.
- the chain transfer agent include thiol compounds such as mercaptoethanol and mercaptopropionic acid, and reducing inorganic salts such as sodium sulfite, sodium bisulfite and sodium hypophosphite.
- the polymerization is preferably performed under light irradiation because the polymerization time is short and the productivity is excellent.
- ultraviolet light or Z and visible light rays are used, and among them, ultraviolet light is preferable.
- the intensity of light irradiation is determined in consideration of the type of water-soluble monomer, the type and concentration of photopolymerization initiator and Z or photosensitizer, the molecular weight of the target water-soluble polymer, and the polymerization time.
- 1S In general, 0.5—1, OOOW / m 2 power is preferable, 5—400 W / m 2 power is more preferable! / ⁇ .
- a fluorescent chemical lamp for example, a fluorescent chemical lamp, a fluorescent blue lamp, a metal halide lamp, a high-pressure mercury lamp, or the like can be used.
- the temperature of the aqueous solution of the water-soluble monomer is not particularly limited. However, in order to allow the photopolymerization reaction to proceed smoothly under mild conditions, usually 5 — Preferably 100 ° C. 10—more preferably 95 ° C. As the temperature at the start of polymerization, the molecular weight of the obtained water-soluble polymer can be made large, and the heat can be easily removed. In some respects, 5-15 ° C is preferred.
- the light irradiation polymerization reaction of the aqueous solution of the water-soluble monomer may be performed in a batch system or a continuous system.
- the water-soluble polymer obtained in the present invention is mainly a graft copolymer in which a polymer of a water-soluble monomer is grafted on a polysaccharide.
- Component Force A water-soluble polymer may be present.
- the water-soluble polymer obtained in the present invention preferably has a 0.5% salt viscosity of 5-200 mPa's, which is an index of molecular weight, and is stable when used as a polymer flocculant described later.
- 0.5% salt viscosity refers to a sample obtained by dissolving 0.5% of a water-soluble polymer in a 4% aqueous solution of sodium chloride at 25 ° C and a rotor No. Using 1 or 2, read the value measured at 60 rpm!
- the obtained polymer is preferably one having a 0.1% insoluble content of 5 ml or less after washing.
- the polymer in the case of 0.1% insoluble content, the polymer is dissolved in pure water to prepare 400 ml of a 0.1% by mass (in terms of solid content) solution. The whole amount of this solution was filtered through a 20 cm diameter, 83 mesh sieve, the insoluble matter remaining on the sieve was collected, and the value obtained by measuring the volume was as follows.
- the polymer obtained by the aqueous solution polymerization is usually in a gel state, cut into pieces by a known method, dried at a temperature of about 60 to 150 ° C. using a band dryer, a far-infrared dryer, or the like. It is pulverized by a pulverizer or the like to make a powdery polymer, the particle size is adjusted, or additives are added.
- a powdery product is preferably used for various uses.
- the water-soluble polymer obtained in the present invention can be applied to various uses, and is particularly useful as a polymer flocculant.
- a polymer flocculant it can be further preferably used as a sludge dewatering agent, a papermaking agent in a papermaking process such as a retention aid, and the like.
- the polymer flocculant of the present invention is particularly useful as a sludge dewatering agent and a retention aid. is there.
- a sludge dewatering agent and a retention aid is there.
- the sludge dewatering agent and the yield improver will be described.
- the sludge dewatering agent of the present invention When using the sludge dewatering agent of the present invention (hereinafter sometimes referred to as a polymer flocculant, it is sometimes mixed with known additives such as sodium hydrogen sulfate, sodium sulfate and sulfamic acid, which do not adversely affect the dehydration treatment. You may use it.
- the sludge dewatering agent of the present invention is applicable to various sludges, and organic sludge and coagulated sludge generated in sewage, human waste, and general industrial wastewater such as food industry, chemical industry, and pulp or paper industry sludge. And the like.
- the sludge dewatering agent of the present invention can be preferably applied to sludge having a small fiber content, that is, sludge having a high surplus ratio. Specifically, it can be preferably applied to sludge having a surplus ratio of 10 SS% or more, and more preferably to sludge having a surplus ratio of 20 to 50 SS%.
- the dewatering method using the sludge dewatering agent of the present invention is to add a sludge dewatering agent to sludge and then form a sludge floc.
- the method of forming the flocks may be in accordance with a known method.
- an inorganic coagulant an organic cationic compound, a cationic polymer coagulant, and an aionic polymer coagulant can be used in combination.
- inorganic coagulant examples include aluminum sulfate, polychlorinated aluminum, ferric chloride, ferrous sulfate, and polyiron sulfate.
- organic cationic conjugate examples include polymer polyamines, polyamidines, and cationic surfactants.
- the pH adjustment is not particularly necessary, but does not satisfy the range limited by the present invention. ⁇ In the case, adjust by adding acid or alkali.
- Examples of the acid include hydrochloric acid, sulfuric acid, acetic acid, and sulfamic acid.
- Examples of the alkali include caustic soda, caustic potash, slaked lime, and ammonia.
- cationic polymer flocculant a homopolymer of the above-mentioned cationic monomer and examples thereof include copolymers of the above-mentioned cationic monomers and nonionic monomers.
- Examples of the a-on polymer flocculant include a homopolymer of the above-described a-on monomer and a copolymer of the above-described anionic monomer and nonionic monomer. it can.
- the addition ratio of the polymer flocculant to sludge is preferably 5 to 500 ppm, and is preferably 0.05 to 1 mass% for SS.
- a polymer flocculant and another polymer flocculant are used together, it is preferable that the total amount of all the polymer flocculants satisfies the above-mentioned addition ratio.
- the addition amount of the sludge dewatering agent and other coagulants, the stirring speed, the stirring time, and the like may be in accordance with the dehydration conditions conventionally used.
- the floc thus formed is dehydrated using a known means to obtain a dewatered cake.
- Examples of the dehydrator include a screw press dehydrator, a belt press dehydrator, a filter press dehydrator, a screw decanter, and the like.
- the sludge dewatering agent of the present invention can also be applied to a dewatering method using a granulation and concentration tank having a filtration unit.
- the sludge is introduced into a granulation and concentration tank having a filtration part for the sludge, and filtered from the filtration part
- the liquid is taken out and granulated, and the granulated material is subjected to a dehydration treatment with a dehydrator.
- the polymer is preferably in a powder form.
- the retention aid may be used in accordance with a conventional method, for example, when the paper stock is diluted to the final concentration to be fed into a paper machine or after the dilution.
- the paper stock to which the retention aid is applied may be any one used in a normal papermaking process, and usually contains at least pulp and filler, and if necessary, additives other than filler, Specifically, it contains a sizing agent, a fixing agent, a paper strength enhancer, a colorant, and the like.
- Examples of the filler include clay, kaolin, agarite, talc, calcium carbonate, magnesium carbonate, lime sulfate, barium sulfate, zinc oxide and titanium oxide.
- Examples of the sizing agent include acrylic acid-styrene copolymer, etc.
- examples of the fixing agent include a sulfuric acid band, potassium thione starch and alkyl ketene dimer, and examples of the paper strength enhancer include starch and cationic.
- amphoteric polyacrylamide and the like can be mentioned.
- the preferable addition ratio of the retention aid is 0.05 to 0.8% by mass, more preferably 0.05 to 0.5% by mass, based on the dry pulp mass in the stock. is there.
- the pH of the stock after addition of the retention aid is preferably maintained at 5-10, more preferably 5-8. After the addition of the retention aid, the stock is immediately sent to the paper machine.
- a high-molecular-weight polymer can be grafted onto a polysaccharide by a simple method, and a water-soluble polymer obtained with a small amount of a residual monomer can be used as a flocculant. It also exhibits excellent properties, particularly as a polymer flocculant and a retention aid.
- the present invention is a method for producing a water-soluble polymer in which a water-soluble monomer essentially including a cationic monomer is polymerized in the presence of a polysaccharide, an azo-based polymerization initiator, and a hydrogen abstracting agent.
- a polysaccharide an azo-based polymerization initiator
- a hydrogen abstracting agent e
- a hydrogen abstracting agent it is preferable to use a peroxide, and it is preferable to use 10-1 OOOppm based on the total amount of the polysaccharide and the water-soluble monomer.
- the water-soluble monomer is preferably used in an amount of 50% by mass or more based on the total amount of the polysaccharide and the water-soluble monomer.
- the 0.5% salt viscosity of the obtained water-soluble polymer is preferably from 5 to 200 mPa's.
- the polymerization is preferably performed by photopolymerization.
- the water-soluble polymer obtained by the production method of the present invention is preferably used as a polymer flocculant. It can be preferably used as a sludge dewatering agent and a retention improver.
- DAC dimethylaminoethyl phthalate methyl chloride quaternary salt
- AM aqueous solution of acrylamide
- Amphoteric starch slurry [Ace KT 245 manufactured by Oji Constarch Co., Ltd. Solids content: 22% or less, referred to as "KT 245".
- KT 2445 Solids content: 22% or less
- ion-exchanged water was diluted with ion-exchanged water to a solid content of 5%, and further heated at 80 ° C. for 30 minutes for cooking to obtain an amphoteric starch slurry having a solid content of 6%.
- the total weight was adjusted to 1. Okg, and the mixture was stirred and dispersed.
- V-50 azobisamidinopropane hydrochloride
- the obtained polymer was taken out of the container and shredded. This was dried at a temperature of 80 ° C for 5 hours and then ground to obtain a powdery polymer. This polymer is called A-1.
- A-1 the 0.1% insoluble dissolution amount (hereinafter simply referred to as “insoluble content”), the 0.5% salt viscosity (hereinafter simply referred to as “salt viscosity”), and the residual monomer amount were measured according to the following methods. Table 1 shows the results.
- the polymer is dissolved in pure water to prepare 400 ml of a 0.1% (in terms of solid content) aqueous solution.
- KT 36 is Oji Constarch Co., Ltd.'s Cation Idori starch (trade name: Ace KT 36; solid content: 22%; hereinafter referred to as “KT 36”), which was cooked under the same conditions as in Example 1.
- KT 36 Oji Constarch Co., Ltd.'s Cation Idori starch (trade name: Ace KT 36; solid content: 22%; hereinafter referred to as “KT 36”), which was cooked under the same conditions as in Example 1.
- KT 36 Oji Constarch Co., Ltd.'s Cation Idori starch
- the obtained polymer was taken out of a container and dried and pulverized under the same conditions as in Example 1 to obtain a powdery polymer.
- the obtained polymer was taken out of a container and dried and pulverized under the same conditions as in Example 1 to obtain a powdery polymer.
- Example 2 polymerization proceeded without any problem, and a polymer having a high salt viscosity and a small amount of insoluble components and residual monomers could be obtained.
- Comparative Example 8 described later, the polymer obtained in Comparative Example 1 had insufficient performance as a flocculant.
- Comparative Example 2 in which the hydrogen abstracting agent was not used, the grafting was insufficient, and the resulting polymer gel was considered to be a starch-rich polymer and a monomer-rich polymer. The problem of separation occurred.
- Comparative Example 3 in which no azo-based polymerization initiator was used, the obtained polymer had a low salt viscosity and a large amount of residual monomer.
- KT 245 cooked under the same conditions as in Example 1 and having a solid content of 6% was used. This was charged with 220 g, which is equivalent to 3% of the total solid content of the monomer and starch, and 20 g of ion-exchanged water was added. The amount was adjusted to 1. Okg and dispersed by stirring.
- the temperature of the solution was adjusted to 10 ° C while blowing nitrogen gas into the solution for 60 minutes, and then 1000 ppm of V-50 and 0.3 ppm of cupric chloride were used, based on the solid content of all monomers and starch.
- 30 ppm of APS the addition of sodium bisulfite as a 30 ppm, from above the reaction container, perform the polymerization 6. shines irradiation for 60 minutes at an irradiation intensity of OmWZcm 2 using 100W black light, hydrogel A water-soluble polymer was obtained.
- the obtained polymer was taken out of a container and dried and pulverized under the same conditions as in Example 1 to obtain a powdery polymer.
- This polymer is called A-3.
- AA acrylic acid
- the obtained polymer was taken out of a container and dried and pulverized under the same conditions as in Example 1 to obtain a powdery polymer.
- Example 6 polymerization proceeded without any problem, and a polymer having a high salt viscosity, a small amount of insoluble components and a small amount of residual monomer could be obtained.
- the obtained polymer was taken out of a container and dried and pulverized under the same conditions as in Example 1 to obtain a powdery polymer.
- Comparative Examples 4 and 5 in which no starch was used, the polymerization proceeded without any problem, and a high salt viscosity was obtained. It was possible to obtain a polymer having a small amount of insoluble matter and residual monomer. However, as shown in Comparative Examples 9 and 10 described later, the polymers obtained in Comparative Examples 4 and 5 had insufficient performance as a flocculant.
- Comparative Example 6 in which no hydrogen abstracting agent was used, the grafting was insufficient, so that the resulting polymer gel was separated into two layers.
- Comparative Example 7 in which no azo-based polymerization initiator was used, the obtained polymer had a low salt viscosity and a large amount of residual monomers.
- As the flocculant a 0.1% aqueous solution of the polymers A-1 and A-2 obtained in the above example was used.
- Sludge flocs were produced in the same manner as in Example 7 except that a 0.2% aqueous solution of polymer B-1 was used as a flocculant, and the particle size of the flocs was measured.
- a flocculant a 0.1% aqueous solution of polymer A-3-A-6 obtained in the above example was used. Sludge floc was generated in the same manner as in Example 7, and the particle size of the floc was measured. Thereafter, the filtration speed and the water content were measured in the same manner as in Example 7. Table 5 shows the evaluation results.
- Example 9 a sludge floc was produced in the same manner as in Example 9 except that a 0.2% aqueous solution of the polymer B-4-1B-6 obtained in the comparative example was used as a flocculant. Was measured.
- the polymer flocculant of the present invention was found to have a good floc diameter, an excellent initial drainage rate and a good drainage, and very good flocs.
- raw pulp slurry 1% pulp slurry obtained by disintegrating and beating the used paper after deinking (hereinafter referred to as “DIP”) was used.
- DIP disaggregation should be performed using 1% of the sample. Outside, the procedure was performed until the Canadian standard freeness according to JIS P 8121 (Canadian Standard Freeness, hereinafter CSF! Became 280 ml.
- paper is made with a square bronze screen manufactured by Kumagai Riki Kogyo Co., Ltd., pressed with a square sheet machine press, and dried at 100 ° C with an auto dryer. The formation of the formed paper was visually checked.
- the meanings of ⁇ and ⁇ in Table 7 are as follows.
- the retention aid of the present invention has a better drainage rate and a higher retention rate than the retention modifier of Comparative Example 12 which is not starch-modified, and the paper after papermaking is also very excellent in formation.
- the production method of the present invention can be used for producing a water-soluble polymer, and the obtained water-soluble polymer can be preferably used as a polymer flocculant, particularly as a sludge dewatering agent and a retention aid. More preferably available.
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Graft Or Block Polymers (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
- Polymerisation Methods In General (AREA)
- Treatment Of Sludge (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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EP04819891A EP1693391A4 (en) | 2003-12-03 | 2004-12-02 | PROCESS FOR OBTAINING A WATER SOLUBLE POLYMER |
US10/581,556 US20070138105A1 (en) | 2003-12-03 | 2004-12-02 | Process for producing water-soluble polymer |
JP2005515959A JP4946051B2 (ja) | 2003-12-03 | 2004-12-02 | 水溶性高分子の製造方法 |
KR1020067010956A KR101107581B1 (ko) | 2003-12-03 | 2004-12-02 | 수용성 폴리머의 제조방법 |
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JP2003-404738 | 2003-12-03 | ||
JP2003404738 | 2003-12-03 |
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WO2005054316A1 true WO2005054316A1 (ja) | 2005-06-16 |
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PCT/JP2004/017936 WO2005054316A1 (ja) | 2003-12-03 | 2004-12-02 | 水溶性高分子の製造方法 |
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US (1) | US20070138105A1 (ja) |
EP (1) | EP1693391A4 (ja) |
JP (1) | JP4946051B2 (ja) |
KR (1) | KR101107581B1 (ja) |
CN (1) | CN100500720C (ja) |
WO (1) | WO2005054316A1 (ja) |
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- 2004-12-02 JP JP2005515959A patent/JP4946051B2/ja not_active Expired - Fee Related
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007023068A (ja) * | 2005-07-12 | 2007-02-01 | Dainippon Ink & Chem Inc | 両面粘着テープ及び両面粘着テープの製造方法 |
JP2007152305A (ja) * | 2005-12-08 | 2007-06-21 | Hymo Corp | 有機汚泥の処理方法 |
JP2013501104A (ja) * | 2009-07-31 | 2013-01-10 | アクゾ ノーベル ナムローゼ フェンノートシャップ | ハイブリッドコポリマー組成物 |
CN104861115A (zh) * | 2015-02-10 | 2015-08-26 | 中科润蓝环保技术(北京)有限公司 | 一种阴离子型葡聚糖絮凝剂的制备方法 |
CN110054733A (zh) * | 2019-03-15 | 2019-07-26 | 中国科学院宁波材料技术与工程研究所 | 造纸助留剂、造纸助留剂的制备方法及其应用 |
Also Published As
Publication number | Publication date |
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JPWO2005054316A1 (ja) | 2007-12-06 |
JP4946051B2 (ja) | 2012-06-06 |
EP1693391A1 (en) | 2006-08-23 |
KR101107581B1 (ko) | 2012-01-25 |
US20070138105A1 (en) | 2007-06-21 |
KR20070008530A (ko) | 2007-01-17 |
CN100500720C (zh) | 2009-06-17 |
CN1890279A (zh) | 2007-01-03 |
EP1693391A4 (en) | 2007-07-18 |
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