WO1996017884A1 - Resine absorbant l'eau, son procede de production et composition de resine absorbant l'eau - Google Patents
Resine absorbant l'eau, son procede de production et composition de resine absorbant l'eau Download PDFInfo
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- WO1996017884A1 WO1996017884A1 PCT/JP1995/002523 JP9502523W WO9617884A1 WO 1996017884 A1 WO1996017884 A1 WO 1996017884A1 JP 9502523 W JP9502523 W JP 9502523W WO 9617884 A1 WO9617884 A1 WO 9617884A1
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- water
- absorbent resin
- monomer
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- aqueous
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
- C08J9/06—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L15/00—Chemical aspects of, or use of materials for, bandages, dressings or absorbent pads
- A61L15/16—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons
- A61L15/42—Use of materials characterised by their function or physical properties
- A61L15/425—Porous materials, e.g. foams or sponges
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L15/00—Chemical aspects of, or use of materials for, bandages, dressings or absorbent pads
- A61L15/16—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons
- A61L15/42—Use of materials characterised by their function or physical properties
- A61L15/60—Liquid-swellable gel-forming materials, e.g. super-absorbents
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C257/00—Compounds containing carboxyl groups, the doubly-bound oxygen atom of a carboxyl group being replaced by a doubly-bound nitrogen atom, this nitrogen atom not being further bound to an oxygen atom, e.g. imino-ethers, amidines
- C07C257/10—Compounds containing carboxyl groups, the doubly-bound oxygen atom of a carboxyl group being replaced by a doubly-bound nitrogen atom, this nitrogen atom not being further bound to an oxygen atom, e.g. imino-ethers, amidines with replacement of the other oxygen atom of the carboxyl group by nitrogen atoms, e.g. amidines
- C07C257/14—Compounds containing carboxyl groups, the doubly-bound oxygen atom of a carboxyl group being replaced by a doubly-bound nitrogen atom, this nitrogen atom not being further bound to an oxygen atom, e.g. imino-ethers, amidines with replacement of the other oxygen atom of the carboxyl group by nitrogen atoms, e.g. amidines having carbon atoms of amidino groups bound to acyclic carbon atoms
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2207/00—Foams characterised by their intended use
- C08J2207/12—Sanitary use, e.g. diapers, napkins or bandages
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2300/00—Characterised by the use of unspecified polymers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/141—Feedstock
Definitions
- the present invention relates to sanitary materials (body fluid absorbing articles) such as paper disposables (disposable disposables), sanitary napkins, so-called incontinence pads (jigs for incontinent persons), wound protection materials, wound healing materials, or the like.
- Water-absorbing resin suitable for use as an absorbent article such as a construction material, a water-absorbing material for soil, a water-absorbing material for food, etc., a water-absorbing material, a method for producing the same, and the water-absorbing resin And a water-absorbing resin composition using the same.
- sanitary materials such as paper mummies, sanitary napkins, incontinence pads, wound protection materials, wound healing materials, etc. have been designed to absorb body fluids such as urine, sweat, and blood as constituents.
- Water-absorbing resins are widely used.
- water-absorbing resin is used not only as a sanitary material, but also as a material for water absorption (absorption) and water retention, such as building materials, soil water retention materials, dry absorbent materials for foods, etc. Widely used in IB for various purposes such as moisture absorption.
- water-absorbing resin examples include, for example, crosslinked polyacrylic acid partially neutralized products (JP-A-55-84304, JP-A-55-108407, JP-A-55-133413, U.S. Pat. No. 4,654,039), a hydrolyzate of starch-acrylonitrile graft polymer (Japanese Patent Publication No. 49-43995), and a neutralized product of starch-acrylic acid graft polymer (JP-A No. No.
- Each of these water-absorbent resins is in the form of powder or powder having a particle diameter of about 0.01 to 5 mm.
- the water absorption rate of a water-absorbent resin is determined by the diameter of the abdomen, and the smaller the diameter of the abdomen, the higher the water absorption rate of the individual particles tends to be. 36, 614, 1987).
- the water-absorbing resin when used, it is necessary to select the optimal size of the abductor diameter in consideration of the above-mentioned water absorption speed and liquid permeability.
- the water-absorbing resin tends to cause a gel block as the water absorption speed increases.
- the main causes of gel block include reduced voids and increased tackiness between particles after swelling under pressure.
- the following methods for producing and modifying the water-absorbent resin have been proposed. That is, as a method of manufacturing water-absorbent resin, for example, 1) a method of performing secondary crosslinking treatment, that is, a method of increasing the bridge density near the particle surface, and 2) a method of increasing the surface area of the particles by granulation, foaming, making porous, etc. have been proposed. .
- the above method (1) includes, for example, a method using a polyhydric alcohol as a surface-building agent, a method using a polyvalent glycidyl compound, a polyvalent aziridine compound, a polyvalent amine compound, or a polyvalent isocyanate compound; A method using glyoxal, a method using a polyvalent metal salt, a method using a silane coupling agent, a method using a monoepoxy compound, a method using an epoxy group-containing polymer, a method using an epoxy compound and a hydroxy compound, an alkylene carbonate And the like.
- a method using a foaming agent at the time of polymerization or crosslinking is proposed.
- a method using a foaming agent for example, a method of introducing a bridging structure into a linear water-soluble polymer while neutralizing with a foaming agent such as a carbonate (US Pat. No. 4,529,739) No. 4,649.164, etc.), a method of adding a carbonate to a monomer (Japanese Patent Publication No. 62-34042, Japanese Patent Publication No. 2-60681, Japanese Patent Publication No. 2-54362, U.S. Pat. 1 18.719, U.S. Patent No. 5,154.713, U.S. Pat. No.
- the water absorption rate of the water absorbent resin can be improved to some extent.
- the water-absorbing resin subjected to the secondary bridge treatment cannot achieve a quick water-absorbing speed required for use in, for example, sanitary materials.
- a water-absorbent resin formed by foaming a linear polymer has insufficient water absorption (water retention) and is costly.
- a porous water-absorbent resin formed by foaming while polymerizing a monomer has excellent water absorption speed and is inexpensive, but it is difficult to control the timing of the foaming.
- a certain pore size cannot be obtained.
- the water-absorbing resin improves various properties such as the diffusibility of the aqueous liquid, the amount of the water-soluble component, the amount of the residual monomer, and the dry stickiness (all described later). Is insufficient.
- the water-absorbing resin obtained by the above-mentioned production method / modification method has insufficient mutual balance of conflicting properties such as the diffusibility of the aqueous liquid, the amount of the water-soluble component, and the dry touch property. That is, the above-mentioned conventional water-absorbing resin is insufficiently improved in water-absorbing properties, and therefore cannot attain the high water-absorbing properties required for use in, for example, sanitary materials.
- the above-mentioned production method and modification method have an object to design a water-absorbing resin so that when the water-absorbing resin comes into contact with the aqueous liquid, the aqueous liquid can be quickly absorbed. . Therefore, with respect to sanitary materials, in particular, sanitary materials using a large amount of water-absorbing resin in order to reduce the thickness, little consideration has been given to the water-absorbing properties required of the water-absorbing resin.
- the present invention has been made in view of the above-mentioned conventional problems, and has as its object to provide an aqueous liquid having excellent water absorption properties such as the scalability, the water absorption rate, the water retention ability, and the dry stickiness, and the amount of the water-soluble component. With reduced residual monomer content
- An object of the present invention is to provide an aqueous resin and a method for producing the same, and a water-absorbing resin composition using the water-absorbing resin. Disclosure of the invention
- the inventors of the present invention have conducted intensive studies on a water-absorbing resin, a method for producing the same, and a water-absorbing resin composition in order to achieve the above object.
- a solid foaming agent having an average particle diameter in a range of 1 m to 100 m in an aqueous monomer solution containing an unsaturated monomer and a crosslinking agent.
- the water-absorbent resin obtained by polymerizing the monomer can improve the water-absorbing properties such as the diffusivity, water-absorption rate, water-retaining ability, and dry-tatch property of the aqueous liquid, and reduce the amount of water-soluble components and residual monomers. I found it to be diminished.
- the method for producing a water-absorbent resin of the present invention in order to solve the above-mentioned problem, requires that an aqueous monomer solution containing an unsaturated monomer and a crosslinking agent has an average diameter of 1 m to 10 m. After dispersing a solid foaming agent in the range of 0 / m, the unsaturated monomer is polymerized.
- a water-absorbing resin having excellent water-absorbing properties such as diffusivity, water-absorbing speed, water-retaining ability, and dry-tatch property of an aqueous liquid, and having a reduced water-soluble component amount and a residual unit amount can be produced at low cost. And it can be easily obtained industrially.
- the water-absorbent resin of the present invention has a 1 Q / I ⁇ ! ⁇ 500 // m, porous with an average pore size within 15 surroundings, and water absorption It is characterized by a water absorption under pressure of 25 g / g or more after 60 minutes from the start, a water-soluble component content of 15% by weight or less, and a residual monomer content of 50 ppm or less.
- the water-absorbent resin composition of the present invention has a water retention capacity of 20 g / g or more, a water absorption rate of 120 seconds or less, and a liquid passing rate under pressure of 20 g. It is characterized by being less than 0 seconds.
- a water-absorbent resin which is excellent in liquid permeability under pressure of an aqueous liquid, which is easy to expand, does not cause gel block, and has improved water absorption speed, water retention ability, etc. And a water-absorbing resin composition.
- the unsaturated monomer used as a raw material in the present invention has water solubility.
- unsaturated monomers include, for example, acrylic acid, ⁇ -acryloyloxyb-D-pionic acid, maleic acid, crotonic acid, (non-aqueous) maleic acid, fumaric acid, Itaconic acid, caffeic acid, sorbic acid, 2 — (meth) acryloyl sulfonic acid, 2 — (meth) acryloylbutanepansulfonic acid, 2 — (meta) acrylamide 2 — Acid-group-containing monomers such as methyl brono, sulfonic acid, vinyl sulfonic acid, styrene sulfonic acid, aryl sulfonic acid, vinyl phosphonic acid, and 2- (meta) acryloyloxetyl sulfonic acid , And these alkali metal salts and alkaline earth gold extended salts, ammonium salt
- N-alkylbutylpyridinium halide hydroxymethyl (meta) acrylate, 2—hydroxyxethyl (meta) acrylate, 2—hydroxypropyl (meta) acrylate, etc.
- Hydroxyalkyl (meta) acrylates acrylylamide, methacrylylamide, N-ethyl (meta) acrylylamide, Nn-propyl (metaylamide) Acrylamide, N-isobrovir (meta) Acrylamide, N, N-dimethyl (meta) atalylamide, 2—Hydroxyshetyl (meta) acrylic , 2-Hydroxylobir (meta) acrylate, methoxypolyethylene glycol (meta) acrylate, polyethylene glycol mono (meta) acrylate, vinyl Resin, N-vinylpyrrolidone, N-acryloyl biperidine, N-acryloyl bi-peroxide; vinyl a
- These monomers may be used in a single insect, or may be used by appropriately mixing two or more kinds.
- an unsaturated monomer containing an acrylate-based monomer as a main component is preferable because the water-absorbing property of the obtained water-absorbing resin is further improved.
- the acrylate-based monomer refers to acrylic acid and / or water-soluble salts of acrylic acid.
- Water-soluble salts of acrylic acid are those having a neutralization ratio in the range of 30 mol 3 to 100 mol, preferably in the range of 50 mol% to 99 mol1 ⁇ 2.
- sodium salts and magnesium salts are more preferred. These acrylate salts may be used alone or in combination of two or more.
- the amount of the monomer other than the acrylate-based monomer used is determined based on the total amount of the unsaturated monomer. More preferably, it is less than 40% by weight, more preferably less than 30% by weight, and particularly preferably less than 10% by weight.
- crosslinking agent used for polymerizing the unsaturated monomer in the present invention examples include: a compound having a plurality of vinyl groups in the molecule; a compound having at least one vinyl group in the molecule, Compounds having at least one functional group capable of reacting with the carboxyl group of the saturated monomer: Compounds having a plurality of functional groups capable of reacting with the carboxyl group in the molecule.
- These crosslinking agents may be used alone or in combination of two or more.
- Examples of the compound having a plurality of vinyl groups in the molecule c include, for example, N, Methylenbis (meta) acrylamide, (bolly) ethylene glycol (meta) acrylate, (bolly) propylene glycol (meta) acrylate, trimethylol Propane (meta) acrylate, trimethylolpropane (meta) acrylate, glycerine (meta) acrylate, glycerine Rate methacrylate, ethylene oxide-modified trimethylolpropane tri (meta) acrylate, pentaerythritol tetra (meta) atalylate, dipentylate Thrill Kisa (main evening)
- a compound having at least one vinyl group in the molecule and having at least one functional group capable of reacting with a carboxyl group for example, a compound having at least one hydroxyl group, epoxy group, cationic group, etc. And other unsaturated ethylenic compounds.
- the compound include glycidyl (meth) acrylate, N-methylolacrylamide, dimethylaminoethyl (meth) acrylate and the like.
- Examples of the compound having a plurality of functional groups capable of reacting with a carboxyl group in the molecule include a compound having at least two groups such as a hydroxyl group, an epoxy group, a cationic group, and an isocyanate group.
- Can be Specific examples of the compound include (poly) ethylene glycol diglycidyl ether, glycerol diglycidyl ether, ethylene glycol, polyethylene glycol, propylene glycol, glycerin, and pentaerythritol. Examples include tall, ethylene diamine, ethylene carbonate, volleyn lime, aluminum sulfate, and the like.
- the amount of the apple agent to be used for the unsaturated monomer depends on the combination of the unsaturated monomer and the crosslinking agent, etc., but is 0.01% by weight to 100 parts by weight of the unsaturated monomer. Parts by weight to 10 parts by weight, more preferably 0.001 to 5 parts by weight in a $ ⁇ range, and still more preferably 0.01 to 2 parts by weight. If the amount of the crosslinking agent exceeds 10 parts by weight, the water absorption of the resulting water-absorbent resin is reduced, and foaming by a foaming agent described later is not sufficient.
- the amount of the crosslinking agent used is less than 0.0001 parts by weight, the water absorption rate and gel strength of the obtained water-absorbent resin are reduced, and the amount of water-soluble components is increased. It is not preferable because it becomes difficult to control the foam by the foaming agent. If the unsaturated monomer is polymerized without using a crosslinking agent, the water-absorbing properties of the resulting water-absorbent resin and various properties of the water-absorbent resin after water absorption become insufficient.
- the above unsaturated monomer is used in order to improve the water absorbing properties of the resulting water-absorbent resin and to efficiently perform foaming with a foaming agent.
- the crosslinking agent is an aqueous solution. That is, it is preferable to use water as the solvent.
- the concentration of the unsaturated monomer in the aqueous solution (hereinafter, referred to as an aqueous monomer solution) is more preferably in the range of 20 to 65 weight%, more preferably 25 to 60 weight%. Within the range And particularly preferably in the range of 30% by weight to 45% by weight.
- the concentration of the unsaturated monomer is less than 20% by weight, the amount of water-soluble components in the obtained water-absorbent resin may increase, and the foaming with the foaming agent becomes insufficient, thereby increasing the water absorption density. It may not be possible to do so.
- the degree of unsaturation of the unsaturated monomer exceeds 65% by weight, it may be difficult to control the reaction temperature and the foaming by the foaming agent.
- water and an organic solvent soluble in water can be used as a solvent for the aqueous monomer solution.
- the organic solvent specifically, for example, methyl alcohol, ethyl alcohol, acetate, dimethyl sulfoxide, ethylene glycol monomethyl ether, glycerin, (poly) ethylene glycol Coal, (b) propylene glycol, alkylene carbonate, and the like. These organic solvents may be used alone or in combination of two or more.
- the amount of the organic solvent used may be within a range where the average particle diameter of the foaming agent can be controlled in a dispersed state within the range of 1 m to 100 m in fB. Specifically, the amount may be 40% by weight or less, more preferably 20% by weight or less, even more preferably 10% by weight or less based on water.
- the foaming agent used for polymerizing the unsaturated monomer is a labyrinth-like compound which is hardly soluble in water and the organic solvent and is a solid at room temperature.
- the foaming agent include, for example, abdicarbonamide, abbisisobutyronitrile, potassium abdicarboxylate, dinitrosopentamethylentramine, 4,4′-one Oxybis (benzensulfonylhydrazide), para-toluenesulfonylhydrazide , Diaboaminobenzene, N.N'-dimethyl-N, ⁇ , -dinitro-so-terephthalamide, nitrodiarea, acetone-p-toluenesulfonylhydrazone, ⁇ -toluenesulfonylazide, 2,4-toluenedisulf Honylhydrazide, p-methylbenzenebenzenesulfonylhydr
- X and X each represent an alkyl group having 1 to 4 carbon atoms.
- X and X are each independently an alkyl having 1 to 4 carbon atoms.
- X and X each independently represent an alkyl group having 2 to 4 carbon atoms.
- R and R are each independently a hydrogen atom or carbon
- foaming agents may be used alone or in combination of two or more.
- an acrylate of an amino group-containing ab compound is more preferred.
- the acrylate of the azo compound containing an amino group can be prepared without using a surfactant or a dispersion stabilizer such as a water-soluble polymer (described later), or by stirring the aqueous monomer solution.
- the acrylate of the azo compound containing an amino group is particularly convenient for its dispersibility in an acrylate salt-based monomer.
- acrylate of the amino group-containing compound represented by the general formula (1) or (2) specifically, for example, 2,2'-abbis (2- Methyl-N-phenylpropionamidine) niacrylate, 2,2'-azobis [N- (4-chlorophenyl)-2-methyl-butane pi-amidine] niacrylate, 2, 2'-azobis [N- (4-Hydroxyphenyl) -1-2-methylpropionamidine] diacrylate, 2, 2 * Abbis [2-methyl-N- (phenylmethyl) -propionamidine] niacrylate, 2,2 'Abbis [2-methyl-1-N- (2-probenyl) brobionamidine] diacrylate, 2.2'-Azobis (2-methylbu ⁇ -biomidine) diacrylate ⁇ ⁇ , 2, Two
- acrylate of the amino group-containing ab compound can be isolated, for example, by precipitating in an aqueous monomer solution and then using a method such as filtration. When the acrylate salt of the amino group-containing ab compound is precipitated in the aqueous monomer solution, a poor solvent may be added to the aqueous monomer solution, if necessary. Cooling or the like may be performed.
- the above foaming agent may be used by adding a previously prepared foaming agent to an aqueous monomer solution.
- a precursor of the foaming agent (hereinafter referred to as a foaming agent precursor) may be used as an aqueous monomer solution.
- carbon dioxide gas or an acrylate salt may be added to the aqueous monomer solution to prepare the aqueous monomer solution.
- the blowing agent can be deposited by reacting the blowing agent precursor with the carbon dioxide gas or acrylate in the aqueous monomer solution.
- the acrylate sodium acrylate is preferred.
- the unsaturated monomer is a acrylate salt monomer
- the unsaturated monomer can act as an acrylate salt.
- the acrylic acid salt of the amino group-containing ab compound has a function as a foaming agent and a function as a radical polymerization initiator.
- the amount of the water-soluble component and the remaining monomer i are further increased. It is possible to obtain a reduced water-absorbing resin.
- the amount of the water-soluble component is not more than 15% by weight, preferably 1 to 10% by weight, and A water-absorbent resin having a residual monomer content of 500 ppm or less, preferably 300 ppm or less, more preferably 100 ppm or less can be obtained.
- the amount of the blowing agent used for the unsaturated monomer is The setting may be made according to the combination of the foaming agent, etc., and is not particularly limited. It is more preferably in the range, 0.01 to 5 parts by weight; more preferably in the range of S part, particularly preferably in the range of 0.05 to 2.5 parts by weight. If the amount of the foaming agent is outside the above range, the resulting water-absorbent resin may have insufficient water absorption properties.
- the average diameter of the foaming agent present in a dispersed state during polymerization in the aqueous monomer solution is preferably from 1 m to 100 m, more preferably from 2 m to 50 m. , 3 / zm to 4 O jum is more preferable.
- the average pore size of the water-absorbent resin is within the range of 10/111 to 50011, more preferably 2 mm! Within the range of ⁇ 40 Otm, more preferably 3! In the range of ⁇ 300zm, most preferably 5!
- the water-absorbing properties of the water-absorbent resin for example, the diffusivity of an aqueous liquid and the water absorption speed
- the average diameter of the foaming agent the average pore diameter of the water-absorbing resin can be set within a desired range.
- the average diameter of the foaming agent When the average diameter of the foaming agent is smaller than 1, or when the foaming agent is dissolved in the aqueous monomer solution, the foaming becomes insufficient and the average pore size of the water-absorbing resin falls within a desired range. It is not preferable because it cannot be adjusted. On the other hand, when the average particle size of the foaming agent is larger than 100 / m, the average pore size of the water-absorbent resin cannot be adjusted to a desired range. In addition, the gel strength of the obtained water-absorbent resin is lowered, and the amount of water-soluble components is increased, which is not preferable.
- the average particle size of the foaming agent in the monomer aqueous solution The diameter can be easily measured by using a laser completeness distribution meter.
- the blowing agent precursor when the blowing agent is an inorganic compound include calcium hydroxide, magnesium hydroxide, and the like.
- the foaming agent precursor is a hydrochloride salt of an amino group-containing abu compound, and specifically, for example, 2.2′-abbis (2-methyl-N-phenyl bromide) Pionamidine) dihydrochloride, 2,2'-Abbis [N— (4-chlorophenyl) -12-methyl-propionamidine] dihydrochloride, 2, 2 * —Abbis [N-(4- (Hydroquinphenyl) 1 2 —methyl bromion amidine] dihydrochloride, 2,2′-abbis [2 —methyl—N— (phenylmethyl) -probionamidine] dihydrochloride, 2, 2 ′ abbis [2-methyl — N-I (2-Provenyl) Probio Amidine] dihydrochloride, 2,2'-azobis (2-methyl
- the hydrochloride of the amino group-containing ab compound causes sedimentation, suspension, and separation when the solubility in the aqueous monomer solution is low. Therefore, if the hydrochloride of the azo compound containing an amino group is used as it is as a foaming agent, a water-absorbent resin having excellent water-absorbing properties cannot be obtained.
- Conditions for preparing an acryl group salt of an amino group-containing ab compound by reacting the hydrochloride salt of the amino group-containing ab compound with the acrylate salt are not particularly limited. The following conditions are preferred. Then, by setting these conditions arbitrarily and appropriately setting the diameter of the lactate at the time of dispersing the acrylate of the amino group-containing azo compound, the pore size of the obtained water-absorbent resin can be adjusted to a desired size. It should be adjusted to.
- the preparation temperature is preferably 110 ⁇ (: up to 50 ° C, more preferably 0 to 40.
- the acrylate is preferably an alkali metal acrylate, more preferably an alkali metal salt.
- the neutralization ratio of the acrylate is preferably 50 mol% or more, more preferably 70 mol% or more, and the acrylic acid in the aqueous monomer solution is more preferable.
- the salt concentration is preferably in the range of 20% by weight to saturated clarity, and more preferably in the range of 25% by weight to saturated concentration.
- the acrylate of the amino group-containing azo compound it is preferable to stir the aqueous monomer solution.
- aqueous monomer solution By stirring the aqueous monomer solution at preferably 10 rpm or more, more preferably at 20 rpm to 10, OOO rpm, an azo group-containing azo having a substantially uniform diameter is obtained.
- the acrylate of the compound can be converted in a short time.
- the acrylate of the amide group-containing ab compound may be used as it is in the polymerization of the unsaturated monomer, and need not be used once.
- a method for preparing an acrylate of an azo compound containing an amino group in an aqueous monomer solution that is, dispersing the acrylate of the azo compound containing an amino group in the aqueous monomer solution
- examples of the method include the following methods. That is, after adding the hydrochloride salt of an azo compound containing an amino group to the acrylate salt having a neutralization rate of 100%, an acrylate salt of an azo compound containing an amino group was prepared.
- a method for obtaining an aqueous monomer solution by mixing an unsaturated monomer such as acrylic acid, which is not neutralized with acrylic acid, a crosslinking agent, and, if necessary, a solvent an aqueous monomer solution prepared in advance: A monomer in which the hydrochloride salt of an amino group-containing ab compound and, if necessary, an acrylate salt are added to the aqueous solution of the halo body, and the acrylate salt of the amino group-containing ab compound is dispersed.
- a method of preparing an aqueous solution and the like can be mentioned. Among these methods, the latter method is preferable because the acrylate salt of the amino group-containing ab compound can be obtained more efficiently and the particle diameter becomes more uniform.
- a solvent such as water is added to the aqueous monomer solution to convert the unsaturated monomorph in the aqueous monomer solution to a desired concentration. May be adjusted.
- the water-absorbent resin according to the present invention is obtained by dispersing a foaming agent in an aqueous monomer solution and then polymerizing an unsaturated monomer (aqueous solution polymerization).
- the method for dispersing the foaming agent in the aqueous monomer solution is not particularly limited.
- a method of adding and dispersing a blowing agent to an aqueous monomer solution a method of adding a blowing agent precursor to an aqueous monomer solution, and then preparing and dispersing a blowing agent in the aqueous monomer solution; Saturated monomers, crosslinking agents, and blowing agents
- a method of adding a foaming agent precursor to an aqueous monomer solution and then preparing and dispersing a foaming agent in the aqueous monomer solution is known as a water-absorbing resin having more excellent water absorbing properties. Is more preferable because When the blowing agent is removed, the aqueous monomer solution may be stirred or may not be stirred.
- the blowing agent is an inorganic compound such as a carbonate
- the unsaturated monomer contains an acrylate monomer as a main component
- the inorganic compound and the acrylate monomer are used. Since the reactivity with the monomer is relatively high, it is difficult to disperse the inorganic compound in the aqueous monomer solution and to control its particle size. Therefore, in this case, it is desirable to disperse the inorganic compound in the aqueous monomer solution using a dispersion stabilizer such as a surfactant or a water-soluble polymer.
- Suitable dispersion stabilizers when the blowing agent is a carbonate include, for example, hydrophilic solvents such as methyl alcohol, ethyl alcohol, propyl alcohol, butyl alcohol, acetonitril, and dimethylformamide.
- hydrophilic solvents such as methyl alcohol, ethyl alcohol, propyl alcohol, butyl alcohol, acetonitril, and dimethylformamide.
- Organic solvent such as methyl alcohol, ethyl alcohol, propyl alcohol, butyl alcohol, acetonitril, and dimethylformamide.
- High water-solubility such as polybutyl alcohol, starch and derivatives thereof, polygalactomannan, cellulose such as methylcellulose, carboxymethylcellulose, and hydroxyethylcellulose, and derivatives thereof, polyalkylene oxides, polyacrylic acid, and polyacrylic acid salts.
- Fatty acid salts such as sodium oleate and castor oil, alkyl sulfates such as sodium lauryl sulfate and ammonium lauryl sulfate, and alkylbenzenes such as sodium dodecylbenzenesulfonate Sulfonates, alkyl naphthalene sulfonates, dialkyl sulfosuccinates, Anionic surfactants such as alkyl phosphates, naphthalene sulfonic acid formalin condensates, polyoxyethylene alkyl sulfates, etc.
- alkyl sulfates such as sodium lauryl sulfate and ammonium lauryl sulfate
- alkylbenzenes such as sodium dodecylbenzenesulfonate Sulfonates, alkyl naphthalene sulfonates, dialkyl sulfosuccinates
- Nonionic surfactants such as esters, sorbitan fatty acid esters, polyoxinsorbin fatty acid esters, polyoxyethylene alkylamines, fatty acid esters, and oxyethylene-l-oxypropylene block copolymers:
- Alkaline amine salts such as lauryl ammonium acetate, etc.
- catholy such as quaternary ammonium salts such as lauryl trimethyl ammonium chloride, stearyl trimethyl ammonium chloride, etc.
- surfactants such as lauryl ammonium acetate, etc.
- quaternary ammonium salts such as lauryl trimethyl ammonium chloride, stearyl trimethyl ammonium chloride, etc.
- Amphoteric ion surfactants such as lauryl dimethyl amine oxide; and the like, but are not particularly limited. These separation stabilizers may be used alone or in combination of two or more.
- At least one selected from the group consisting of a water-soluble polymer and a surfactant is more preferable, and it is more preferable to use a water-soluble polymer and a surfactant in combination.
- a water-soluble polymer and a surfactant in combination.
- the water-soluble polymers polyvinyl alcohol, starch and its derivatives, cellulose and its derivatives are more preferable, and polyvinyl alcohol and quinethyl cellulose are particularly preferable. It is more preferable that the above-mentioned polyvinyl alcohol is partially genated.
- the surfactants anionic surfactants and nonionic surfactants are more preferred, and nonionic surfactants having an HLB of 7 or more are particularly preferred.
- the inorganic compound (foaming agent) can be uniformly fractionated in the aqueous monomer solution, and the average diameter of the inorganic compound can be controlled within a range of 1 m to 100 // m.
- the amount of the dispersion stabilizer to be used with respect to the blowing agent may be set according to the combination of the blowing agent and the dispersion stabilizer, and is not particularly limited. And not more than 500 parts by weight, more preferably not more than 100 parts by weight, still more preferably not more than 100 parts by weight, and most preferably not more than 500 parts by weight, based on 100 parts by weight of the blowing agent. It may be 0 parts by weight or less.
- it is in the range of 0.01 to 500 parts by weight, more preferably in the range of 0.05 to 100 parts by weight, and even more preferably 0.5 parts by weight.
- the unsaturated monomer in the aqueous monomer solution in which the blowing agent is dispersed can be polymerized by a known method.
- the polymerization method various methods such as, for example, a radical polymerization method using a radical polymerization initiator, a radiation polymerization method, an electron di polymerization method, and an ultraviolet polymerization method using a photosensitizer can be adopted.
- the radical polymerization method is more preferable because the polymerization of the unsaturated monomer can be performed quantitatively and completely.
- radical polymerization method examples include aqueous solution polymerization, casting polymerization performed in a mold, thin-layer polymerization performed on a belt conveyor, polymerization performed while subdividing the formed hydrogel polymer, and reverse phase turbidity polymerization.
- Various polymerization forms such as reverse-phase emulsion polymerization, precipitation polymerization, and bulk polymerization can be employed.
- aqueous solution polymerization in which the unsaturated monomer is polymerized in the form of an aqueous solution is more preferable because the polymerization temperature can be easily controlled.
- any of continuous polymerization and batch polymerization may be employed, and the polymerization may be performed under any of depressurized pressure, pressurized pressure, and normal pressure. May be implemented.
- the polymerization is preferably performed under a stream of an inert gas such as nitrogen, helium, argon, or carbon dioxide.
- radical polymerization initiator include, for example, ammonium persulfate, potassium persulfate, sodium persulfate, hydrogen peroxide, benzoyl peroxide, cumenehydride.
- Peroxides such as D-peroxide and g-butyl baroxide: The above-mentioned peroxides are combined with a reducing agent such as sulfite, bisulfite, thiosulfate, formamide sulfonic acid, and ascorbic acid.
- Redox initiator formed in combination Acrylate of azo compound containing an amino group represented by formula (1) or (2) above: The azo compound containing an amino group An azo-based polymerization initiator such as a hydrochloride; These radical polymerization initiators may be used alone or in combination of two or more. When an acrylate of an amino group-containing ab compound is used as a radical polymerization initiator, it is more preferable to use a redox initiator in combination.
- the amount of the radical polymerization initiator to be used with respect to the unsaturated monomer depends on the combination of the unsaturated monomer and the radical polymerization initiator.
- the range is preferably from 0.5 to 5 parts by weight, and more preferably from 0.05 to 2.5 parts by weight.
- the amount of the radical polymerization initiator used is less than 0.0005 parts by weight, the amount of unreacted unsaturated monomers increases, and thus the amount of residual monomers in the obtained water-absorbent resin increases. Is not preferred.
- the amount of the radical polymerization initiator used is 5 If the amount exceeds the weight part, the amount of water-soluble components in the obtained water-absorbent resin increases, which is not preferable.
- the temperature at the start of polymerization depends on the type of radical polymerization initiator used.
- the range of K is from 0 to 40, and the range of 15 from 10 to 30 is more preferable.
- the polymerization temperature during the reaction depends on the type of the radical polymerization initiator used, but is more preferably 40 to 120 ° C, more preferably 50 • C to 110. Is more preferred. If the temperature at the start of polymerization or the polymerization temperature during the reaction is out of the above range, the amount of residual monomers in the obtained water-absorbent resin increases: it becomes difficult to control foaming by a foaming agent; , The water absorption of the water-absorbing resin is reduced, and the like may be caused.
- the reaction time may be set according to the combination of the unsaturated monomer crosslinking agent and the radical polymerization initiator, or according to the reaction conditions such as the reaction temperature, and is not particularly limited.
- the time from the dispersion of the foaming agent to the start of the polymerization of the unsaturated monomer is not particularly limited, but is preferably a relatively short time.
- the aqueous body fluid may or may not be stirred, but it is effective to keep the aqueous monomer solution in a static state for at least a predetermined time during the reaction, so that foaming with the foaming agent is efficient. It is preferable to perform it. And, from the start of polymerization, the time until the polymerization rate becomes 10% or more, more preferably the time until it becomes 30% or more, more preferably the time until it becomes 509 or more, particularly preferably the polymerization time By allowing the aqueous monomer solution to stand still until the time of the holly, the foaming with the foaming agent can be performed more efficiently.
- the general formula (1) or the general formula (2) When the acrylate of the amino group-containing azo compound to be used is used as a foaming agent, the time from the start of the polymerization to the end of the polymerization, that is, the polymerization can be all carried out with stirring.
- a hydrogel containing bubbles which is a (co) polymer of an unsaturated monomer, is produced.
- the unsaturated monomer undergoes (co) polymerization, the bridging reaction by the bridging agent, and the foaming by the foaming agent proceed to form pores (voids) in the (co) polymer and contain bubbles. It becomes a hydrogel.
- the above-mentioned hydrogel containing cells is broken up into fragments of about 0.1 mm to about 50 mm by a predetermined method during or after the reaction as necessary.
- the foamed hydrogel is dried in order to foam the foam more efficiently.
- the foaming with the foaming agent can be performed not at the time of reaction but at the time of drying.
- the drying temperature is not particularly limited, but is preferably in the range of 100 ° C. to 300 ° C., more preferably 120 ° C. What is necessary is just to set it within K of 220'C.
- the drying time is not particularly limited, but is preferably about 10 seconds to 3 hours. Before drying, the hydrogel containing bubbles may be neutralized, or may be further crushed and differentiated.
- Drying methods include heat drying, hot air drying, reduced pressure drying, infrared drying, microwave drying, drum dryer drying, azeotropic dehydration with a hydrophobic organic solvent, and high-humidity drying using high-temperature steam.
- various methods can be adopted, and there is no particular limitation.
- hot air drying and microwave drying are more preferred, and microwave drying is even more preferred.
- microwaves are applied to the hydrogel containing bubbles, bubbles are several times larger. Since it expands several tens of times, it is possible to obtain a water-absorbing resin whose water absorption speed has been further improved by one calendar year.
- the thickness of the crushed bubble-containing hydrogel is preferably 3 mm or more, more preferably 5 mm or more, and more preferably 10 mm or more. More preferably,
- the water-absorbing resin according to the present invention can be obtained easily and inexpensively
- the above-mentioned water-absorbing resin has pores formed uniformly throughout, a relatively large molecular weight, and an average pore diameter of 10 to 500 zm. m, more preferably in the range of 20 ⁇ !
- the sheet-like water-absorbing resin obtained by microwave-drying the water-containing gel containing bubbles has a bulk specific gravity of 0.01 gZcm, and 5 gZ cm 3 o
- the above average pore diameter can be determined by performing an image analysis of a cross section of the dried water-absorbent resin using a microscope. That is, a histogram representing the distribution of pore sizes of the water-absorbent resin is created by performing image analysis, and the average pore size is determined by calculating the number average of the pore sizes from the histogram. Since it is a porous material having an average pore diameter, a liquid conducting space necessary for the transfer of the aqueous liquid into the water-absorbent resin under no pressure and under pressure is sufficiently ensured. Therefore, it is excellent in permeability and diffusivity of aqueous liquids, and the water absorption rate and water retention capacity etc. are enhanced by capillary action. Can be improved.
- the water-absorbing resin is porous, it is possible to maintain the liquid permeability when the aqueous liquid passes between the particles, even if the shape of the water-absorbing resin is particulate. It does not produce so-called gel blocks.
- the average pore diameter is smaller than 10 / m, the liquid permeability and the diffusivity of the aqueous liquid are poor, which is not preferable.
- the average pore diameter is larger than 500 tm, the water absorption rate is poor, which is not preferable.
- the shape and size (diameter) of the water-absorbent resin may be appropriately set according to the use of the water-absorbent resin, and are not particularly limited.
- the water-absorbing resin can be in various shapes, for example, a sheet shape or a block shape. However, when the water-absorbing resin is used as a sanitary material, a process such as pulverization and separation is performed.
- the average particle diameter is in the range of 50 m to 1,000 m, more preferably in the range of 150 m / im to 800 m, and still more preferably 200 ⁇ !
- the particle size may be adjusted to a range of up to 600 m.
- the water-absorbing resin can be formed into particles by performing a granulation operation.
- the water-absorbing resin having the above configuration may be further treated with a surface crosslinking agent to form covalent bonds (secondary crosslinks), thereby further increasing the crosslink density near the surface.
- the above-mentioned surface palm may be a compound having a plurality of functional groups capable of forming a covalent bond by reacting with the carboxylic group of the water-absorbing resin, and is not particularly limited. Absent.
- the surface cross-linking agent include, for example, ethylene glycol, diethyl glycol, propylene glycol, triethylene glycol, tetraethylene glycol, polyethylene glycol, propylene glycol. Recohol, 3-propanediol, dipropylene glycol, 2.2,4—trimethyl-1,3-pentanediol, polypropylene glycol, glycerin, polyglycerin, 2-butene-1.4-diol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, 1,2-cyclohexanedimethanol, 1,2-cyclohexanediol, trimethylol bronokun, Polyhydric alcohol compounds such as diethanolamine, triethanolamine, polypropylene propylene, oxyethylene-l-oxypropylene block copolymer, bentaerythritol and sorbitol;
- Polyvalent isocyanate compounds such as 2,4-tolylene diisocyanate and hexamethylene diisocyanate: 1,2—Polyvalent oxazoline compounds such as ethylenebisoxabrin: 7—glycidoxyprovirt Silane cutting such as rimethoxysilane, 7- aminopropyltrimethoxysilane Agent:
- 1,3-Dioxolan-1-2-one 4-Methyl-1,3-dioxofuran-12-one, 4,5-Dimethyl-1,3-dioxolan-1-one, 4,4-Dimethyl-1,3-dioxolan 2-one, 4-ethyl-1,3-dioxolan-2-one, 4-hydroxymethyl-1,3-dioxolan-1-one, 3-dioxane-2-one, 4-methyl-1,2-dioxane Alkylene carbonate compounds such as 2-one, 4,6-dimethyl-1,3-dioxane-12-one and 1,3-dioxopan-12-one; and the like, but are not particularly limited. .
- polyhydric alcohol compounds, epoxy compounds, polyvalent amine compounds, condensates of polyvalent amine compounds and haloepoxy compounds, and alkylene carbonate compounds are more preferred.
- These surface-building agents may be used alone or in combination of two or more.
- the first surface cross-linking agent and the second surface picking agent having different solubilities (SP values) are combined to improve water absorption properties. Further excellent water-absorbing resin can be obtained.
- the above solubility parameter is a value generally used as a factor indicating the polarity of a compound.
- the first surface cross-linking agent is a compound capable of reacting with the carboxyl group of the water-absorbent resin and having a solubility parameter of 12.5 (ca 1 / cm 3 ) 1/2 or more. This corresponds to Lin etc.
- the second surface cross-linking agent is a compound capable of reacting with a carboxyl group of the water-absorbing resin and having a solubility parameter of 12.5 (ca 1 / cm 3 ) 1/2 , for example, ethylene glycol. Corresponding to diglycidyl ether.
- the amount of the surface builder used for the water-absorbent resin depends on the combination of the water-absorbent resin and the surface builder, but is 0.01% by weight based on 100 parts by weight of the dry, water-absorbent resin. Parts by weight to 5 parts by weight, more preferably 0.05 to 3 parts by weight.
- a surface-building agent within the above range, the water-absorbing properties with respect to body fluids (aqueous liquids) such as urine, sweat, and blood can be further improved.
- the amount of the surface cross-linking agent used is less than 0.01 parts by weight, the bridge density near the surface of the water-absorbent resin can hardly be increased. If the amount of the surface cross-linking agent used is more than 5 parts by weight, the surface cross-linking agent becomes excessive and incomplete, and it is difficult to control the cross-linking density to an appropriate value.
- the treatment method when treating the water-absorbent resin with the surface cross-linking agent is not particularly limited.
- a hydrophilic solvent water or a mixture of water and an organic solvent soluble in water is preferable.
- organic solvent examples include, for example, methyl alcohol, ethyl alcohol, n- propyl alcohol, iso-bromo alcohol, n-butyl alcohol, is 0-butyl alcohol, t-butyl alcohol, and the like.
- Low alcohols Ketones such as acetone: Dioxane, ethylene oxide (E ⁇ ) adducts of monohydric alcohols, ethers such as tetrahydrofuran; N, N-dimethylformamide, ⁇ -force Prolac Amides such as tam; sulfoxides such as dimethyl sulfoxide; and the like.
- These organic solvents may be used alone or in combination of two or more.
- the amount of the hydrophilic solvent used for the water-absorbent resin and the surface-crosslinking agent depends on the combination of the water-absorbent resin, the surface-crosslinking agent, and the hydrophilic solvent. 200 parts by weight or less, more preferably 0.01 part by weight to 50 parts by weight, still more preferably 0.1 part by weight to 50 parts by weight, particularly preferably 0.5 part by weight. It may be within the range of up to 20 parts by weight.
- the mixing device used when mixing the water-absorbing resin and the surface-building agent preferably has a large mixing force in order to uniformly and reliably mix the two.
- Examples of the above mixing apparatus include a cylindrical mixer, a double-walled conical mixer, a high-speed stirring mixer, a V-shaped mixer, a ribbon mixer, a screw mixer, and a fluidized furnace.
- Rotary desk mixers, air-flow mixers, double-arm kneaders, internal mixers, crushers, rotary mixers, screw-type extruders and the like are preferred.
- the treatment temperature and treatment time when treating the water-absorbent resin with the surface cross-linking agent may be appropriately set according to the combination of the water-absorbent resin and the surface cross-linking agent, the desired crosslinking density, and the like, and are particularly limited.
- the processing temperature is 0 and preferably in the range of 250 ° C.
- a mixing aid When treating the water-absorbent resin with a surface cross-linking agent, a mixing aid may be further added as necessary.
- the mixing aid include water-insoluble fine powders, surfactants, organic acids, inorganic acids, and boramino acids.
- Organic acids include, for example, succinic acid, lactic acid, Carboxylic acid and the like.
- the inorganic acid include phosphoric acid, sulfuric acid, and hydrochloric acid.
- These mixing aids may be used alone, or two or more kinds may be used in combination.
- the mixing aid may be used in the range of 0.01 to 5 parts by weight based on 100 parts by weight of the water-absorbing resin.
- the method of mixing the water-absorbing resin and the surface framing agent with the mixing aid is not particularly limited.
- the water-absorbing resin whose crosslink density is increased near the surface due to the formation of covalent bonds that is, the water-absorbing resin treated as described above, is treated with a cationic compound to form an ionic bond (
- the formation of (secondary crosslinks) may further increase the crosslink density near the surface by one calendar year.
- the cationic compound described above may be any compound that can react with a carboxyl group (that is, a carboxylic acid group that has not reacted with the surface crosslinking agent) of the water-absorbing resin to form an ionic bond. It is not something to be done.
- the water-absorbing properties of the water-absorbent resin such as the water absorption rate, the diffusivity, the water retention ability, the dryness and the water absorption under pressure, are further improved.
- the cationic compound include low-molecular-weight polyvalent amino acids such as ethylenediamine, diethylenetriamine, triethylenetetrathamine, tetraethylenebenthamine, and pentaethylenehexamine.
- the amount of the cationic compound used in the water-absorbing resin depends on the combination of the water-absorbing resin and the cationic compound, etc., but is 0.01 part by weight with respect to 100 parts by weight of the dry absorbent ⁇ water-absorbing resin.
- the amount may be within the range of 5 to 5 parts by weight, more preferably within the range of 0.1 to 3 parts by weight.
- a water-absorbent resin having further improved water absorption properties such as water absorption rate, diffusivity, water retention ability, dry absorption, and water absorption under pressure can be obtained.
- the treatment method when treating the water-absorbent resin with the cationic compound is the same as the treatment method when treating with the surface cross-linking agent.
- the treatment temperature and the treatment time when treating the water-absorbent resin with the cationic compound may be appropriately set according to the combination of the water-absorbent resin and the cationic compound, the desired crosslinking density, and the like.
- the processing temperature is preferably room temperature, and may be heated to about 50 ° C. to 100 ° C. as necessary.
- the water-absorbing resin can be industrially obtained at low cost and easily.
- the resulting water-absorbent resin is within the range of 10 // m to 500 / m
- the average pore size is as follows.
- the water-absorbing resin has a water absorption under pressure of 60 g or more after 60 minutes from the start of water absorption, and preferably 25 g / g or more, more preferably 30 gZg or more.
- the water-absorbent resin has a water-soluble component content of 15% by weight or less, more preferably 1% by weight to 10% by weight.
- the water-absorbing resin has a residual monomer content of 500 ppm or less, more preferably 300 ppm or less, and still more preferably 100 ppm or less.
- the water-absorbing resin is excellent in these various physical properties and has a good balance between the physical properties, and therefore has excellent water-absorbing properties such as liquid permeability under pressure.
- water-absorbent resin In addition to the above water-absorbent resin, if necessary, deodorants, fragrances, various inorganic powders, foaming agents, pigments, dyes, hydrophilic short fibers, plasticizers, dying agents, surfactants, fertilizers , An oxidizing agent, a reducing agent, water, salts and the like may be added to impart various functions to the water-absorbing resin.
- the water-absorbent resin composition according to the present invention has a water-absorbent resin having the above structure, that is, the average particle diameter is in the range of 50 / im to 500 / zm by the steps of pulverization and handling.
- a water-absorbing resin preferably in the range of 150 xm to 80 O jum, more preferably in the range of 200 / im to 600 m; It can be obtained by mixing with ⁇ .
- the water-absorbing resin composition preferably contains a water-absorbing resin composed of an unsaturated monomer containing an acrylate-based monomer as a main component.
- the inorganic dressing examples include substances inert to aqueous liquids and the like, such as fine particles of various inorganic compounds and fine particles of clay minerals.
- the inorganic powder preferably has a suitable affinity for water and is insoluble or hardly soluble in water.
- metal oxides such as silicon dioxide and titanium oxide; silicic acid (salt) such as natural zeolite / synthetic zeolite; a ⁇ , talc, clay, bentonite and the like.
- silicon dioxide and silicic acid (salt) are more preferable, and silicon dioxide and silicic acid (salt) having an average particle diameter of 200 m or less measured by a Coulter-Counter method are more preferable.
- the amount of the inorganic powder used in the water-absorbent resin depends on the combination of the water-absorbent resin and the inorganic powder, but is preferably 0.01 to 10 parts by weight per 100 parts by weight of the water-absorbent resin. It may be within the range, more preferably within the range of 0.01 to 5 parts by weight.
- the method for mixing the water-absorbent resin and the inorganic powder is not particularly limited, and for example, a dry blend method, a wet mixing method, or the like can be employed, but the dry blend method is preferably employed.
- the water-absorbing resin composition having the above configuration has a water retention capacity of 20 g Z g or more, a water absorption rate of 120 seconds or less, and a liquid flow rate under pressure of 200 seconds or less.
- the water-absorbent resin composition is made into an absorbent article by, for example, complexing (combining) with a fiber material such as pulp.
- absorbent articles include sanitary materials such as paper mummies, sanitary napkins, incontinence pads, wound care materials, wound healing materials, etc.
- Bodher fluid absorbent articles Absorbent articles such as urine for beds: Building materials Materials for civil engineering and construction, such as water retention materials for soil and water, water blocking materials, packing materials, gel water, etc .; Food products such as drips, water retention materials, cold insulation materials, etc .; , And various industrial articles such as coagulants: AA horticultural articles such as water retention materials such as plants and soil, and the like, but are not particularly limited.
- paper mummets include a back sheet (back surface material) made of a liquid-impermeable material, the above-described water-absorbent resin composition, and a top sheet (surface material) made of a liquid-permeable material.
- the ridges are fixed in order and fixed to each other. It is formed by attaching a fastener or the like.
- “paper-made mummies” include pants with paper-made mums that are used for urinating and defecation of infants.
- the water-absorbent resin composition is used under so-called high-temperature conditions, that is, when the ratio of the water-absorbent resin composition to the total amount of the water-absorbent resin composition and the fibrous material is 50% by weight or more. Even under pressure, a sufficient liquid conducting space for the transfer of the aqueous liquid into the water-absorbent resin is ensured. Therefore, it is excellent in liquid permeability and diffusibility of an aqueous liquid under pressure, does not generate gel blocks, and can improve the water absorption rate and the water retention ability by capillary action. This makes it possible to avoid leakage of the sanitary material even in applications that require absorption of the aqueous liquid a plurality of times, for example, when the absorbent article is a sanitary material. Further, the thickness of the sanitary material can be reduced.
- FIG. 1 is a schematic cross-sectional view of measurement equipment used for measuring the amount of water absorption under pressure, which is one of the properties exhibited by the water-absorbent resin of the present invention.
- FIG. 2 is a schematic cross-sectional view of a measurement device used for measuring a liquid flow rate under pressure, which is one of the properties exhibited by the water-absorbent resin composition of the present invention.
- FIG. 3 shows the NMR spectrum of 2.2′-azobis (2-methylpropionamidine) niacrylate, one of the blowing agents in the present invention. It is.
- FIG. 4 is a chart of infrared absorption spectrum (IR) of the above 2,2′-azobis (2-methylpropionamidine) niacrylate.
- FIG. 5 is a drawing-substitute photograph showing the particle structure of the water-absorbent resin obtained in Example 11.
- FIG. 6 is a photograph substituted for a drawing as a condylar micrograph showing the cross-sectional structure of the water-absorbent resin obtained in Example 14.
- FIG. 7 is a photograph as a substitute for a drawing, showing the absorptive structure of the water-absorbent resin obtained in Comparative Example 1.
- part j indicates “parts by weight” and “%” indicates “% by weight” unless otherwise specified.
- the performance was measured by using a particulate water-absorbent resin, and setting the particle size distribution to 100% as a whole, within a range of 850 m to 50 ⁇ m. 25% to 35% of children, 500 / im to 150zm I & A particles within 65% to 75%, abducts within the range of 150m to 10iim It was adjusted to be 0% to 10%.
- 0.2 g of water-absorbent resin is evenly placed in a tea bag (6 cm x 6 cm), heat-sealed at the opening, and then immersed in 0.9% sodium chloride aqueous solution (physiological saline). Crushed. After 60 minutes, the tea bag-type bag was pulled out and drained with a centrifugal separator at 1,300 rpm for 3 minutes. The weight W ,, (g) of the bag was measured. The same operation was performed without using a water-absorbent resin, and the weight W at that time was obtained. , (G) were measured. And from these weights ⁇ Wo,
- this calibration curve was set as an external standard, and the residual monomer amount (p pm) of the water-absorbent resin was determined in consideration of the dilution ratio of the base solution. In addition, this residual monomer amount is a converted value with respect to the solid content of the water-absorbing resin.
- the water-absorbent resin after measuring the diffusion rate that is, the water-absorbent resin that has swollen by absorbing artificial urine
- 20 sheets of 55 mm-diameter paper whose weight has been measured in advance are planted.
- a 500 g weight (load) was placed on the base paper and left for 1 minute. After standing, the weight (g) of the paper was measured, and the dry touch property was evaluated by obtaining the weight increase (g).
- the less the movement of artificial urine from the swollen water-absorbent resin to the base paper the smaller the increase in weight of the base paper.
- the smaller the weight increase the more the swollen water-absorbent resin Tactile feeling becomes dry. That is, it can be evaluated that the dry touch property is good.
- the measuring device includes a balance 1, a container 2 having a predetermined volume mounted on the balance 1, an outside air suction pipe 3, a conduit 4 made of silicone resin, and a glass filter. 6 and a measuring section 5 mounted on the glass filter 6.
- the container 2 has an opening 2a at the top and an opening 2b at the side, and the outside air intake pipe 3 is fitted into the opening 2a, while the opening 2b Conduit 4 is attached to
- the container 2 contains a predetermined amount of artificial urine 12.
- the lower end of the outside air suction pipe 3 is submerged in artificial urine 12.
- the outside air suction pipe 3 is provided to keep the pressure in the container 2 substantially at atmospheric pressure.
- the above glass fill 6 is 55 mm in diameter.
- the container 2 and the glass filter 6 are in communication with each other by a conduit 4. Further, the position and height of the glass filter 6 with respect to the container 2 are fixed.
- the measuring section 5 includes a paper 7, a support cylinder 9, a wire mesh 10 attached to the bottom of the support cylinder 9, and a weight 11. Then, the measuring section 5 places the paper 7 and the support cylinder 9 (that is, the wire mesh 10) on the glass filter 6 in this order, and also places the weight 11 on the support cylinder 9, that is, the wire mesh 10. Is placed.
- the wire mesh 10 is made of stainless steel and formed in a mesh of 400 (mesh size of 38 jt2 m).
- a predetermined amount and a predetermined size of water-absorbent resin 15 are uniformly distributed on the wire mesh 10.
- the height of the upper surface of the wire mesh 10, that is, the height of the contact surface between the wire mesh 10 and the water absorbent resin 15 is set to be equal to the height of the lower end surface 3 a of the outside air suction pipe 3.
- the weight of the weight 11 is adjusted so that a load of 50 gZcm 2 can be uniformly applied to the wire mesh 10, that is, the water absorbent resin 15.
- the amount of water absorbed under pressure was measured using the measuring device having the above configuration.
- the measurement method is described below.
- predetermined preparation operations such as putting a predetermined amount of artificial urine 12 into the container 2: fitting the outside air suction pipe 3 into the container 2 were performed.
- the paper 7 was placed on the glass filter 6.
- 0.9 g of the water-absorbent resin is evenly spread inside the support cylinder 9, that is, on the wire mesh 10, and the weight 11 is put on the water-absorbent resin 15.
- the support cylinder 9 that is, on the wire mesh 10
- the support circle 9 on which the wire mesh 10, that is, the water-absorbent resin 15 and the weight 11 is placed is placed on the filter paper 7 so that the center thereof coincides with the center of the glass filter 16. Was placed.
- the weight W 2 (g) of the artificial urine 12 absorbed by the water-absorbent resin 15 over a period of 60 minutes from the time when the support cylinder 9 was placed on the base paper 7 was transferred to the balance 1 It measured using.
- the same operation is performed without using the water-absorbent resin 15, and the weight at that time, that is, the weight of the artificial urine 12 absorbed by, for example, the base paper 7 other than the water-absorbent resin 15, is measured by the balance 1.
- 0.2 g of the water-absorbent resin composition is evenly placed in a tea bag type bag (6 cm x 6 cm), the opening is heat-sealed, and then 0.9% sodium chloride solution (physiological saline) Dipped in. After 60 minutes, the tea bag-type bag was pulled up, and after draining with a centrifugal separator at 250 G for 3 minutes, the weight W lb (g) of the bag was measured. The same operation was performed without using the water-absorbent resin composition, and the weight W at that time was obtained. b (g) was measured. And from these weights W ⁇ W 0b ,
- the measuring device includes a glass column 20, a pressure rod 21, and a weight 22.
- the glass column 20 is formed in a cylindrical shape having an inner diameter of 1 inch and a height of 400 mm.
- At the bottom of the glass column 20 Is provided with a cock 25 that can be opened and closed freely.
- a glass filter 27 is inserted inside the glass column 20 so that the water-absorbent resin composition 30 can be filled therein.
- the coarseness of the glass fill is 27 G # 2.
- the standard column L ⁇ M is written on the glass column 20.
- ⁇ ⁇ Di L is indicated at a height of 15 O mm from the upper surface of the glass filter 27, and the standard line M is a height of 10 O mm from the upper surface of the glass filter 27.
- a predetermined amount of physiological saline solution 29 is contained in the glass column 20.
- a biocolumn CF-30K (trade name: Catalog No. 22-635-077 manufactured by Inuchi Seieido Co., Ltd.) was used.
- a mounting member 23 on which the weight 22 can be mounted is fixed to the upper end of the pressure rod 21.
- the mounting plate 23 is formed in a disk shape having a diameter slightly smaller than the inner diameter of the glass column 20.
- the pressure pad 21 is formed to have such a length that the mounting plate 23 does not sink into the physiological saline solution 29.
- a pressure plate 24 is fixed to the lower end of the heating rod 21.
- the pressing plate 24 is formed in a circular shape having a diameter of 1 inch and a thickness of 1 Omm, and has 64 holes 24a ... penetrating from the upper surface to the lower surface.
- the holes 24a ... have a diameter of l mm and are provided at intervals of about 2 mm. Therefore, the living saline solution 29 can flow from the upper surface side to the lower surface side of the plate E 24 through the holes 24 a.
- the above-described pressure rod 21, that is, the pressure rod 24 can be moved up and down in the glass column 20. Further, a glass filter 26 is attached to the lower surface of the pressure plate 24. The coarseness of the glass filter 26 is # G0. 31 is adjusted in weight so that a load of 24.5% / cm 'can be uniformly applied to the swollen water-absorbing resin composition 30.
- the liquid passing speed under pressure was measured using the measuring device having the above configuration.
- the measurement method is described below.
- the cock 25 was closed, and the glass filter 27 was inserted into the glass column 20, and then the glass column 20 was filled with 0.5 g of the water-absorbent resin composition.
- an amount (that is, an excess) of physiological saline 29 that the water-absorbent resin composition 30 could not absorb completely was put into the glass column 20 to swell the water-absorbent resin composition 30.
- the pressure rod 21 was inserted into the glass column 20.
- the pressure plate 24 was placed on the water-absorbent resin composition 30 while evacuating air between the swollen water-absorbent resin composition 30 and the glass filter 126 so as not to collect air.
- the weight 22 was placed on the placing plate 23 to press the water-absorbent resin composition 30.
- the amount of the physiological saline 29 flowing out from the point of passing the standard line L to the point of passing the standard diM is about 25 m 1 (actual value).
- the above measurement was repeated three times, and the average value thereof was defined as the liquid passing speed under pressure (seconds). When the same measurement was performed without using the water-absorbent resin composition 30, the liquid passing speed was 10 seconds.
- aqueous monomer solution was prepared. That is, the aqueous monomer solution is a 38% aqueous solution of an acrylate monomer having a neutralization ratio of 75 mol%.
- the mixture was dried with hot air using a hot air dryer at 15 O'C.
- the dried product was pulverized using a roll mill, and further classified according to the JIS standard (850 urn) to obtain a water-absorbent resin according to the present invention. It was confirmed by an electron micrograph that the water-absorbing resin was porous. The average pore size of the water absorbent resin was 60 m.
- the water retention was 29 g / g
- the amount of the residual monomer was 200 ppm
- the amount of the water-soluble component was 9%
- the diffusion rate was 3
- the dry tackiness was 4.3 g
- the water absorption under EE was 11 g Z g. Table 1 shows the results.
- aqueous monomer solution is a 38% aqueous solution of an acrylate salt monomer having a neutralization ratio of 75 mol%.
- Dissolved oxygen was expelled by injecting nitrogen gas into the solution while maintaining the monomer aqueous solution at a temperature of 25.
- 4.3 parts of a 10% aqueous solution of 2,2′-zozobis (2-methylpropionamidine) dihydrochloride was added to the aqueous monomer solution with stirring. Thereafter, the aqueous solution was stirred at a temperature of 25 under a nitrogen stream.
- the resulting bubble-containing hydrogel was taken out, and the same operations as in Example 1 were performed to obtain a water-absorbent resin.
- the average pore size of the water absorbent resin was 70.
- the properties of the water-absorbent resin were measured by the above method.
- the water retention was 33 g / g.
- the amount of residual monomer was 170 ppm, the amount of water-soluble components was 6%, Was 30 seconds, dry touch property was 3.9 g, and water absorption under pressure was 12 g / g.
- the above results are shown in 3 ⁇ 41.
- a monomer aqueous solution was prepared in the same manner as in Example 2. Dissolved oxygen was expelled by blowing nitrogen gas into the monomer aqueous solution while maintaining the aqueous solution at a temperature of 25. Then, with stirring, add 2,2'-abbis (2-methylpropionamidine) dihydrochloride to the aqueous monomer solution. 21 parts of a 0% aqueous solution was added. Thereafter, the aqueous solution was stirred at a temperature of 25 under a nitrogen stream.
- the temperature of the monomer aqueous solution reached about 82'C. Thereafter, while maintaining the temperature at 70 ° C. to 80 ° C., the monomer aqueous solution was further stirred for 10 minutes to polymerize the acrylate monomer. Thus, a bubble-containing hydrogel was obtained.
- the resulting bubble-containing hydrogel was taken out and subjected to the same repercussions as in Example 1 to obtain a water-absorbing resin.
- the average pore size of the water-absorbent resin was 7.
- the water retention was 27 g / g
- the residual monomer content was 120 ppm
- the water-soluble component content was 5%
- the diffusion rate was 3 In 7 seconds
- the dryness was 4.1 g
- the water absorption under pressure was 11 g less. Table 1 shows the results.
- aqueous monomer solution was prepared by mixing 0.15 parts of N, N'-methylenebisacrylamide as a crosslinking agent and 21 parts of deionized water. That is, the aqueous monomer solution is a 38% aqueous acrylate monomer having a neutralization ratio of 75 mol.
- Dissolved oxygen was expelled by blowing nitrogen gas into the monomer aqueous solution while maintaining the temperature at 25. Then, while stirring, 1.34 parts of powdery 2,2′-azobis (2-methylpropionamidine) niacrylate prepared by the above-mentioned preparation method was added to the aqueous monomer solution. . Thereafter, the aqueous solution was stirred at a temperature of 25 ° C. under a nitrogen stream. 2,2'-azobis (2-methylpropionamidine) diacrylate was uniformly dispersed in the aqueous monomer solution.
- Example 5 The water-containing gel thus obtained was taken out, and the same operation as in Example 1 was performed to obtain a water-absorbent resin.
- the average pore size of the water-absorbent resin was 65 / zm.
- the properties of the water-absorbent resin were measured by the methods described above. As a result, the water retention was 27 g / g, the residual monomer content was 220 ppm, the water-soluble component content was 9%, and the diffusion rate was The dry tackiness was 4.38 for 25 seconds, and the water absorption under pressure was 9 g / g. Table 1 shows the results. (Example 5)
- aqueous monomer solution was converted by mixing 0.18 parts of hydroxyethyl cellulose as the agent) and 50 parts of deionized water. That is, the aqueous monomer solution is an aqueous 38% acrylate monomer having a neutralization ratio of 70 mol 96.
- Dissolved oxygen was expelled by blowing (publishing) nitrogen gas into the aqueous monomer solution while maintaining the temperature of the monomer aqueous solution at 25 ° C. Then, 0.18 parts of voroxyethylene sorbitan monostearate as a surfactant (dispersion stabilizer) and 2, 63 parts of heavy calcium carbonate as a foaming agent were added. The average particle size was 3, and the particles were uniformly dispersed in the aqueous monomer solution.
- the water-containing gel thus obtained was taken out, and the same operation as in Example 1 was performed to obtain a water-absorbent resin.
- the average pore size of the water-absorbent resin was 250 m.
- various properties of the water absorbent resin were measured by the above method. As a result, the water retention was 45 g / g.
- the amount of residual monomer was 52 ppm, the amount of water-soluble components was 13%, the diffusion rate was 24 seconds, and the dry stickiness was 4.5 g.
- the water absorption under pressure was 8 gZg. Table 1 shows the results.
- a monomer aqueous solution was prepared in the same manner as in Example 1. Dissolved oxygen was expelled by blowing nitrogen gas into the liquid while maintaining the above monomer aqueous solution at a temperature of 25. Next, 4.3 parts of a 10% aqueous solution of 2,2′-azobis (2-methylpropionamidine) dihydrochloride was added and dissolved in the aqueous monomer solution while stirring. Immediately thereafter, 2.6 parts of an aqueous solution of sodium persulfate 1096 and 1 part of a 1% aqueous solution of L-ascorbic acid were added while stirring the aqueous monomer solution.
- the aqueous monomer solution was stirred, and then, at the time when the polymerization started, the aqueous monomorph aqueous solution was placed. That is, the acrylate monomer was polymerized without generating the blowing agent according to the present invention.
- the temperature of the aqueous monomer solution reached about 95. Thereafter, while maintaining the temperature at 70 ° C. to 85 ° C., the monomer aqueous solution was further stirred for 10 minutes to polymerize the acrylate monomer. As a result, a hydrogel having substantially no air bubbles was obtained. Note that the hydrogel had slightly bubbles having a size of about 2 mm to 4 inm.
- Example 2 The obtained hydrogel was taken out, and the same operation as in Example 1 was performed to obtain a comparative water-absorbent resin.
- the comparative water-absorbent resin had no pores.
- the performance of the comparative water-absorbent resin was measured by the method described above. As a result, the water retention was 29 g / g, and the residual monomer content was 540 pp. m, the amount of the water-soluble component was 143 ⁇ 4, the diffusion rate was 63 seconds, the dry stickiness was 6.1 g, and the water absorption under pressure was 7 g / g. Therefore, the comparative water-absorbing resin was inferior in diffusion rate and dry touch property. Table 1 shows the above results. Further, FIG. 7 shows an 8S-photograph of Anko Ken, which shows the absorptive structure of the comparative water-absorbent resin having a particle diameter in the range of 300 m to 600 m.
- the obtained bubble-containing hydrogel was taken out, and the same operation as in Example 1 was performed to obtain a comparative water-absorbent resin.
- the average pore size of the comparative water-absorbent resin was about 600.
- the performance of the comparative water-absorbent resin was measured by the method described above. As a result, the water retention was 40 g Z g, The body weight was 3,400 ppm, the amount of water-soluble components was 17%, the diffusion rate was 47 seconds, the dry stickiness was 6.5 g, and the water absorption under pressure was 7 g Z g. Therefore, the comparative water-absorbent resin had a large amount of the residual monomer and a large amount of the water-soluble component, and was inferior in the diffusion rate and the dry touch property. Table 1 shows the results.
- the water-absorbent resin obtained in Example 1 was subjected to a secondary frame treatment. First, 0.5 parts of ethylene glycol diglycidyl ether and 0.75 parts of glycerin as a surface cross-linking agent, 0.5 part of lactic acid as a mixing aid, 3 parts of water as a hydrophilic solvent, and isopropyl alcohol The mixture was prepared by mixing 0.75 parts.
- Example 2 100 parts of the water-absorbing resin obtained in Example 1 and the above-mentioned mixed solution were mixed, and the obtained mixture was heated at 195'C for 20 minutes. As a result, a water-absorbent resin having a high cross-link density was formed near the surface and a crosslink was formed, that is, a water-absorbent resin subjected to a secondary crosslinking treatment was obtained.
- the average pore size of the water absorbent resin was 60 m.
- the water-absorbent resin obtained in Example 2 was subjected to a secondary crosslinking treatment.
- a mixed solution was prepared by mixing 1 part of glycerin, 3 parts of water, and 1.75 parts of isopropyl alcohol.
- 100 parts of the water-absorbent resin obtained in Example 2 and the above-mentioned mixed solution were mixed, and the obtained mixture was heated at 195'C for 25 minutes.
- a water-absorbing resin in which a covalent bond was formed in the vicinity of the surface and the cross-linking density was increased, that is, a water-absorbing resin that had been subjected to a second crosslinking treatment was obtained.
- the average pore size of the water absorbent resin was 7 Oim.
- the water absorption capacity was 30 g / g, the residual monomer content was 160 ppm, the water-soluble component content was 6%, and the diffusion rate was 3 g. At 0 seconds, the dry touch property was 2.9 g, and the water absorption under pressure was 31 g Z g. Table 1 shows the results.
- the water-absorbing resin obtained in Example 3 was subjected to a secondary crosslinking treatment. First, 0.05 part of ethylene glycol diglycidyl ether, 0.75 part of glycerin, 0.5 part of boric aspartic acid as a mixing aid, 3 parts of water, and 5 parts of isopropyl alcohol were mixed. A mixture was prepared.
- Example 3 100 parts of the water-absorbent resin obtained in Example 3 and the above-mentioned mixed solution were mixed, and the obtained mixture was heated at 195′C for 15 minutes.
- the average pore size of the water absorbent resin was 7.
- the water-absorbent resin obtained in Example 6 was further subjected to a bridging process S. That is, 100 parts of the water-absorbing resin obtained in Example 6 and 5 parts of a 30% aqueous solution of polyethyleneimine having a weight average molecular weight of 70,000 were mixed, and the obtained mixture was subjected to heat treatment. . As a result, ionic bonds were formed in the vicinity of the surface, and a water-absorbent resin having a higher bridge density was obtained. Various properties of the obtained water-absorbent resin were further improved than those of the water-absorbent resin before the treatment. The same treatment as described above was performed on the water-absorbent resins obtained in Example 7 and Example 8. Various properties of the obtained water-absorbent resin were improved by one calendar year than those of the water-absorbent resin before the treatment.
- the comparative water-absorbent resin obtained in Comparative Example 2 was subjected to a secondary bridge treatment.
- a mixture was prepared by mixing 0.05 part of ethylene glycol diglycidyl ether, 75 parts of glycerin, 0.5 part of lactic acid, 3 parts of water, and 0.75 part of isopropyl alcohol. .
- the water retention was 35 g Z g
- the residual monomer amount was 3,400 ppm
- the water-soluble component amount was 1
- the diffusion rate was 7 seconds
- the diffusion rate was 40 seconds
- the dry tackiness was 5.5 g
- the water absorption under pressure was 23 g / g. Therefore, the comparative water absorbent resin Had a large amount of residual monomers and a large amount of water-soluble components, and were inferior in diffusion rate and dryness.
- Table 1 shows the results. table 1
- Dissolved oxygen was expelled by blowing nitrogen gas into the solution while maintaining a temperature of 25'C with a 37% aqueous solution of sodium acrylate (166%).
- a 10% aqueous solution of 2,2′-azobis (2-methylbrobionamidine) dihydrochloride was added to the above aqueous solution. So After 5 ⁇ , the aqueous solution was stirred under a nitrogen stream at a temperature of 25'C.
- aqueous monomer solution A monomer aqueous solution (hereinafter, simply referred to as an aqueous monomer solution) in which a diacrylate was dispersed was prepared. That is, the aqueous monomer solution is a 38% aqueous solution of the acrylate monomer having a neutralization ratio of 75 mol.
- a 2 L separable flask equipped with a stirrer, a reflux condenser, a thermometer, a dropping port, and a nitrogen gas inlet tube was used as the reaction vessel.
- 4 g of a sucrose fatty acid ester (trade name: DK-ester F-50, manufactured by Dai-ichi Kogyo Seiyaku Co., Ltd.) as a dispersion stabilizer was added.
- 2 L of cyclohexane as a medium was charged.
- the above monomer aqueous solution was added to the dropping funnel.
- the average pore size of the water-absorbent resin was 50 /.
- the water retention was 30 g Z g
- the amount of residual monomer was 70 ppm
- the amount of water-soluble component was 9%
- the diffusion rate was 40 seconds.
- the drytability was 4.5 g
- the water absorption under pressure was 10 g Z g. Table 2 shows the results.
- aqueous monomer solution is an aqueous solution of about 33% of a acrylate monomer having a neutralization ratio of 85 mol%.
- Dissolved oxygen was expelled by blowing nitrogen gas into the monomer aqueous solution while maintaining the temperature at 25'C.
- 40 parts of a 10% aqueous solution of 2,2′-abbis (2-methylpropionamidine) dihydrochloride was added to the aqueous monomer solution with stirring. Thereafter, the aqueous solution was stirred at a temperature of 25'C under a nitrogen stream.
- Example 2 The water-containing gel thus obtained was taken out, and the same operation as in Example 1 was performed to obtain a water-absorbent resin.
- the average pore size of the water-absorbent resin was 150 m.
- the performance of the water-absorbing resin was measured by the above-mentioned method. For 21 seconds, the dry touch property was 4.0 Og, and the water absorption under pressure was 11 g / g. Table 2 shows the above results. Also, the child diameter is 300!
- FIG. 5 shows an electron micrograph showing the particle structure of the water-absorbent resin within the range of up to 600 m.
- aqueous monomer solution is an aqueous solution of about 35.5 acrylate monomer having a neutralization ratio of 85 mol%.
- Dissolved oxygen was expelled by blowing nitrogen gas into the monomer aqueous solution while maintaining the temperature at 25.
- 52 parts of a 10% aqueous solution of 2.2′-azobis (2-methylpropionamidine) dihydrochloride was added to the aqueous monomer solution with stirring. Thereafter, the aqueous solution was stirred at a temperature of 25'C under a nitrogen stream.
- the water-containing gel thus obtained was taken out, and the same operation as in Example 1 was performed to obtain a water-absorbent resin.
- the average pore size of the water-absorbent resin was 100 m.
- the properties of the water-absorbent resin were measured by the above-mentioned methods. As a result, the water retention was 38 g Z g, the residual monomer amount was 270 p ⁇ ⁇ , the water-soluble component amount was 9%, The diffusion rate was 24 seconds, the dry tackiness was 4.0 g, and the water absorption under pressure was 10 g / g. Table 2 shows the above results.
- aqueous monomer solution is an approximately 42% aqueous solution of an acrylate monomer having a neutralization ratio of 85 mol%.
- dissolved oxygen was expelled by injecting methane gas into the liquid.
- 2 1 Azobisu (2 Mechirubu ⁇ Pion'a Mi gin) 1 0% aqueous solution of 5 2 parts of dihydrochloride.
- the aqueous solution was stirred at a temperature of 25'C under a nitrogen stream.
- water 808 was added to the aqueous monomer solution to dilute the concentration of the acrylate monomer from about 42% to about 35.51 ⁇ 2. Thereafter, while stirring the aqueous monomer solution, 36 parts of a 10% aqueous solution of sodium persulfate and 1.7 parts of a 1% aqueous solution of L-ascorbic acid were added. After addition
- the aqueous monomer solution was stirred.
- the water-containing gel thus obtained was taken out, and the same operation as in Example 1 was performed to obtain a water-absorbent resin.
- the average pore size of the water-absorbent resin was 100 m.
- the properties of the water-absorbent resin were measured by the methods described above, the water retention was 38 g Z g, the amount of residual monomer was 270 ppm, the amount of water-soluble components was 9%, and the diffusion rate Was 23 seconds, dry touch property was 4.1 g, and water absorption under pressure was 10 g / g.
- Table 2 The above results are shown in Table 2.
- Example 2 the same polymerization method as that of Example 1 was performed to obtain a hydrogel containing cells. That is, the aqueous monomer solution was allowed to stand, and the acrylate monomer was polymerized to obtain a water-containing gel containing bubbles as a porous crosslinked polymer.
- the average pore size of the water absorbent resin was about 500 / m.
- the performance of the water-absorbing resin was measured by the above method for palm, the water retention was 31 gg, the residual monomer content was 170 ppm, the water-soluble component content was 10 3 ⁇ 4, and the diffusion rate was For 19 seconds, the dry touch property was 4.3 g, and the water absorption under pressure was 9 g / g. Table 2 shows the above results.
- FIG. 6 shows a photograph of the electronic condyle micro-tetsu showing the cross-sectional structure of the water-absorbent resin sheet.
- Example 2 the same polymerization method as in Example 1 was carried out to obtain a hydrogel containing cells. That is, by allowing the aqueous solution of the monomer to stand and polymerizing the acrylate monomer, a hydrogel containing cells, which is a porous cross-linked polymer, is obtained. The obtained hydrogel containing cells is taken out. After being cut into a sheet having a thickness of about 5 mm, the sheet was dried with hot air at 170 ° C. using a hot air dryer. The hydrogel containing cells was dried in a state of being expanded about 1.5 times. Thus, a sheet-like water-absorbing resin according to the present invention was obtained.
- the average pore size of the water-absorbent resin was 250 / zm.
- the water retention was 30 gZg
- the amount of residual monomer was 200 ppm
- the amount of water-soluble component was 9%
- the expansion rate was 24.
- dry tackiness was 4.5 g
- water absorption under pressure was 9 g / g. Table 2 shows the results.
- the water-absorbing resin obtained in Example 13 was subjected to a secondary crosslinking treatment. First, 0.05 part of ethylene glycol diglycidyl ether, 0.75 part of glycerin, 5 parts of lactic acid, 3 parts of water, and 0.75 part of isopropyl alcohol are mixed to form a mixture. Prepared.
- Example 13 100 parts of the water-absorbing resin obtained in Example 13 and the above mixed solution were mixed, and the obtained mixture was heated at 195 for 20 minutes.
- a water-absorbent resin having a crosslinked density formed near the surface and having a high cross-linking density that is, a water-absorbent resin subjected to a secondary bridge treatment was obtained.
- the average pore size of the water-absorbent resin was about 600.
- various properties of the water-absorbing resin were measured by the above-mentioned method.
- a hydrated gel was obtained by performing the same polymerization method as that of Comparative Example 1. That is, a water-containing gel was obtained by allowing the aqueous monomer solution to stand and polymerizing the acrylate monomer.
- the obtained hydrogel was taken out, cut into a sheet having a thickness of about 5 mm, and dried by irradiating microwaves using a home oven. As a result, a sheet-like comparative water-absorbent resin was obtained. However, during drying, a discharge phenomenon occurred on a part of the surface of the hydrogel, and that part burned black.
- the comparative water-absorbing resin had no pores. Also, for comparison As a result of measuring the various properties of the water-absorbing resin by the above method, the water retention was 27 g Z g, the amount of the residual monomer was 64 ppm, the amount of the water-soluble component was 1596, and the diffusion rate was 8 3 seconds, dry touch property was 7.1 g, and water absorption i under pressure was 6 g Z g. Therefore, the comparative water-absorbent resin was inferior in the expansion speed and the dry touch property. Table 2 shows the above results.
- a monomer aqueous solution was prepared in the same manner as in Example 11. While maintaining the above aqueous monomer solution at a temperature of 25, nitrogen gas was blown into the solution to drive out the dissolved disorder. Next, while stirring, 40 parts of a 10% aqueous solution of 2,2′-zobis (2-methylpropionamidine) dihydrochloride was added to the aqueous monomer solution, and immediately, sodium persulfate was added. 28 parts of a 10% aqueous solution of sodium and 1.3 parts of a 1% aqueous solution of L-ascorbic acid were further added. After the addition, the aqueous solution of the monomer was stirred to polymerize the acrylate monomer.
- a bubble-containing hydrogel was obtained. That is, the acrylate monomer was polymerized without generating the blowing agent according to the present invention.
- the bubble-containing water-containing gel is 1 nm!
- the bubbles had a size of about 3 mm.
- the obtained bubble-containing hydrogel was taken out, and the same operation as in Example 1 was performed to obtain a comparative water-absorbent resin.
- the comparative water-absorbing resin had a particle size of 850 m to 10 jtz m and had almost no pores.
- water retention i was 39 g / g
- the amount of residual monomorph was 94 ppm
- the water-soluble component was 12 3 ⁇ 4
- Diffusion rate was 42 seconds
- dry touch property was 6.0 g
- water absorption under pressure was 8 g / g. Therefore, the comparative water-absorbent resin, The amount of residual monomer was large, and the diffusion rate and dry touch property were poor.
- Table 2 shows the above results.
- a monomer aqueous solution was converted in the same manner as in Example 1. Dissolved oxygen was expelled by blowing a nitrogen gas into the monomer aqueous solution while maintaining the aqueous solution at 25'C. Next, while stirring, sorbitan monostearate as a surfactant was added to the aqueous monomer solution so as to be 0.2%, and cyclohexane as a liquid foaming agent was added to 396. It was added as needed. As a result, cyclohexane was uniformly dispersed in the aqueous monomer solution at an average grain diameter of about 50 / zm.
- the obtained hydrogel was taken out, and the same operation as in Example 1 was performed to obtain a comparative water absorbent resin.
- the comparative water absorbent resin has a particle size of 850! 110 m and had almost no pores. Moreover, the comparative water-absorbing resin had a cyclohexane odor.
- the water retention was 27 g / g.
- the amount of residual monomer was 540 ppm, the amount of water-soluble component was 12 3 ⁇ 4, and the diffusion was The speed was 63 seconds, the dry touch property was 7.4 g, and the water absorption under the load was 7 g Z g. Therefore, the comparative water-absorbent resin has a diffusion rate 6 B and dry evening characteristics were poor. Table 2 shows the above results.
- an aqueous monomer solution was prepared in the same manner as in Example 1. Dissolved oxygen was expelled by blowing elementary gas into the solution while maintaining the above-mentioned mono-i-body aqueous solution at a temperature of 25. Then, while stirring the mixture, ethylene carbonate as a liquid foaming agent was dissolved in the aqueous monomer solution so that the concentration became 196.
- the obtained hydrogel was taken out, and the same operation as in Example 1 was performed to obtain a comparative water-absorbent resin.
- the comparative water-absorbent resin has a larva diameter of 850 ⁇ ! 110 m and had almost no pores.
- the water retention was 23 g / g
- the residual monomer content was 74 ppm
- the water-soluble component content was 7 7 ⁇
- the speed was 73 seconds
- the dry touch property was 8.4 g
- the water absorption under pressure was 9 g / g. Therefore, the comparative water-absorbent resin was inferior in diffusion rate and dry touch property.
- Table 2 shows the above palms. ⁇ ⁇ Table 2 Water retention) (mpp
- Example 17 First, the same polymerization method as that of Example 1 was performed to obtain a hydrogel containing cells. That is, by allowing an aqueous solution of the monomer to stand and polymerizing the acrylate monomer, a hydrogel containing cells, which is a porous crosslinked polymer, is obtained.
- the bubble-containing hydrogel thus obtained was taken out, subdivided into a size of about 20 mm to 1 mm, and dried with hot air at 150'C using a hot air dryer. Then The dried product was pulverized using a roll mill, and further sieved with a 20-mesh sieve to obtain a water-absorbent resin according to the present invention.
- Example 2 the same polymerization method as that of Example 2 was performed to obtain a hydrogel containing cells. That is, by allowing the aqueous solution of the monokan body to stand and polymerizing the acrylate monomer, a hydrogel containing cells as a porous cross-linked polymer was obtained. About 20 mn! After the size was reduced to ⁇ lmm, it was heated with a hot air dryer at 150. Next, the dried product was crushed using a roll mill, and further sieved with a 20-mesh sieve to obtain a water-absorbent resin according to the present invention.
- the above water-absorbent resin was subjected to a secondary frame treatment.
- a Min solution was prepared by mixing 1 part of glycerin, 3 parts of water, and 1 part of isopropyl alcohol.
- 100 parts of the above-mentioned water-absorbent resin and the above-mentioned mixed solution were mixed, and the obtained mixture was heat-treated at 195 for 25 minutes.
- a covalent bond is formed in the vicinity of the flat surface, and the water-absorbing resin with a high frame density, that is, the water-absorbing resin that has been subjected to the secondary framing treatment, Obtained.
- the average pore size of the water-absorbent resin that has been subjected to secondary crosslinking is 70 zm, the amount of residual monomers is 150 ppm, the amount of water-soluble components is 5%, and the amount of water absorption under pressure is 31 g Z g.
- the temperature of the aqueous monomer solution reached about 88. Thereafter, while maintaining the temperature at 70 to 80 ° C., the monomer aqueous solution was further stirred for 12 minutes to mix the acrylic acid-rich monomer. Thus, a bubble-containing hydrogel was obtained.
- the obtained hydrogel containing bubbles was taken out, separated into a size of about 2 Omm to lmm, and then dried with a hot air drier using a hot air dryer (TC-Hot air drying).
- the dried product was then pulverized using a roll mill. Then, the mixture was separated by a 20-mesh sieve to obtain a water-absorbing resin according to the present invention.
- the above water-absorbent resin was subjected to a secondary drawing process.
- 0.05 parts of ethylene glycol diglycidyl ether, 0.75 parts of glycerin, 0.5 parts of lactic acid, 3 parts of water, and 0.75 parts of isopyl alcohol are mixed.
- a mixture was prepared.
- 100 parts of the above water-absorbent resin and the above mixed liquid were mixed, and the obtained mixture was subjected to heat treatment at 195 for 20 minutes. Further, 5 parts of a 30% aqueous solution of polyethyleneimine having a weight average molecular weight of 70,000 was mixed with the mixture, and the obtained mixture was subjected to heat treatment.
- a covalent bond and an ionic bond were formed in the vicinity of the surface to obtain a water-absorbent resin having an increased crosslink density, that is, a water-absorbent resin subjected to a secondary cross-linking treatment.
- an aqueous solution obtained by dissolving 2.4 parts of 2.2′-abbisamidinopropane dihydrochloride in 10 parts of water was used as a catalyst.
- An aqueous solution obtained by dissolving 0.2 part of an acid in 10 parts of water and an aqueous solution obtained by diluting 2.29 parts of a 35% aqueous solution of hydrogen peroxide with 10 parts of water were added in this order. .
- the polymerization started, and about 2 hours later, the temperature of the aqueous monomer solution reached about 7 to 7 O'C at the maximum. As a result, a hydrogel was obtained. Thereafter, the hydrogel was placed in an insulated container and kept for 3 hours to reduce the amount of residual monomer to 1,000 ppm or less.
- the above hydrogel was taken out and subdivided using a meat grinder. The temperature of the finely divided hydrogel was about 66. Next, to this hydrogel was added 64% of a 50% aqueous solution of sodium hydroxide. The temperature of the 50% aqueous sodium hydroxide solution was 38'C. Then, the aqueous solution was stirred while further hydrolyzing the hydrogel in the water S solution so that the neutralization was performed uniformly. The aqueous solution generates heat due to the neutralization, and its temperature rises from 88 to 93 I bowled.
- an aqueous solution obtained by dissolving 2.4 parts of ethylene glycol diglycidyl ether as a crosslinking agent in 50 parts of water was added to the above aqueous solution.
- the temperature of the aqueous solution of ethylene glycol diglycidyl ether was 24.
- the aqueous gel was further stirred while further subdividing the hydrogel in the aqueous solution so that ethylene glycol diglycidyl ether was uniformly dispersed and the surface ridge was uniformly formed.
- the above hydrogel having been subjected to neutralization and surface cross-linking was taken out and dried at 105 using a rotary drum drier, so that the water content of the hydrogel was 1096. As a result, a flake-like dried product was obtained. Next, the dried product was pulverized, and further separated using a 20-mesh sieve and a 32-mesh sieve to obtain a comparative water-absorbing resin composition.
- the various properties of the obtained comparative water-absorbent resin composition were measured by the above-mentioned methods.
- the water retention capacity was 31 g / g
- the water absorption rate was 87 seconds
- the liquid flow rate under pressure was 600 seconds. Met. Therefore, the comparative water-absorbent resin composition was inferior in water absorption rate and liquid flow rate under pressure.
- Table 3 shows the above results.
- a 500 ml flask equipped with a stirrer, a reflux condenser, a thermometer, a dropping funnel, and a nitrogen gas inlet tube was used as a reaction vessel.
- This reaction volume Into S, 283 ml of cyclohexane and 2.2 g of aqueous sodium polyoxyethylene dodecyl ether sulfate were added and 2.2 g of aqueous solution of polyoxyethylene dodecyl ether were stirred at 300 rpm to obtain polyoxyethylene dodecyl ether. The sodium sulfate salt was dispersed. After the inside of the flask was purged with nitrogen, the temperature was raised to 75. In addition, the above monomer aqueous solution was placed in the bottom funnel.
- the above-mentioned water-containing gel was dried under reduced pressure by passing the above-mentioned Cyclo D hexane solution to obtain 88.0 g of an acrylic acid (sodium) polymer.
- the polymer was pulverized and further fractionated using a 20-mesh sieve to obtain a comparative water-absorbent resin composition.
- commercially available water-absorbing resin San-Etto IM-500 (trade name, manufactured by Sanyo Kasei Kogyo Co., Ltd .; hereinafter, referred to as “commercially available product E”); Name, manufactured by Arakawa Chemical Co., Ltd .; hereinafter, referred to as “commercially available product F”).
- Table 3 shows the above results.
- the above commercial products A to F were inferior in at least one of the water absorption rate and the liquid flow rate under pressure.
- the aqueous solution is excellent in water absorption properties such as wiping property, water absorption rate, water retention capacity, and dry touch property, and the amount of water-soluble components and residual water
- water absorption properties such as wiping property, water absorption rate, water retention capacity, and dry touch property
- the water-absorbent resin which is excellent in liquid permeability and diffusibility of the aqueous liquid under pressure, does not generate a gel block, and has improved water absorption speed, water retention ability, etc.
- a water-absorbing resin composition can be provided.
- the water-absorbing resin and the water-absorbing resin composition include, for example, sanitary materials (body fluid-absorbing articles) such as paper mummies, sanitary napkins, incontinence pads, wound protection materials, wound healing materials, etc.
- Absorbent articles Construction and soil water-retaining materials, water-stopping materials, packing materials, materials for civil engineering construction such as gel squirrels; Drip absorbent materials; It can be suitably used for absorbent articles in various fields, such as various industrial articles such as materials, anti-condensation materials, and coagulants; agricultural and horticultural articles such as water retention materials such as plants and soil; Thereby, an absorbent article exhibiting the above-mentioned convenient performance can be provided.
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- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- General Health & Medical Sciences (AREA)
- Hematology (AREA)
- Epidemiology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- Dispersion Chemistry (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
- Processes Of Treating Macromolecular Substances (AREA)
- Absorbent Articles And Supports Therefor (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP95939403A EP0744435B2 (en) | 1994-12-08 | 1995-12-08 | Water-absorbent resin, process for production thereof, and water-absorbent resin composition |
US08/687,377 US5985944A (en) | 1994-12-08 | 1995-12-08 | Water-absorbent resin, process for production thereof, and water-absorbent resin composition |
DE69531670T DE69531670T3 (de) | 1994-12-08 | 1995-12-08 | Poröses wasserabsorbierendes Harz |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP30518594 | 1994-12-08 | ||
JP6/305185 | 1994-12-08 | ||
JP6542795 | 1995-03-24 | ||
JP7/65427 | 1995-03-24 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1996017884A1 true WO1996017884A1 (fr) | 1996-06-13 |
Family
ID=26406573
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1995/002523 WO1996017884A1 (fr) | 1994-12-08 | 1995-12-08 | Resine absorbant l'eau, son procede de production et composition de resine absorbant l'eau |
Country Status (5)
Country | Link |
---|---|
US (2) | US5985944A (ja) |
EP (2) | EP1364985A1 (ja) |
CN (1) | CN1071356C (ja) |
DE (1) | DE69531670T3 (ja) |
WO (1) | WO1996017884A1 (ja) |
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Also Published As
Publication number | Publication date |
---|---|
DE69531670D1 (de) | 2003-10-09 |
CN1140458A (zh) | 1997-01-15 |
EP0744435A1 (en) | 1996-11-27 |
EP0744435B2 (en) | 2011-03-23 |
CN1071356C (zh) | 2001-09-19 |
EP0744435B1 (en) | 2003-09-03 |
US6251960B1 (en) | 2001-06-26 |
EP1364985A1 (en) | 2003-11-26 |
US5985944A (en) | 1999-11-16 |
DE69531670T3 (de) | 2012-02-23 |
DE69531670T2 (de) | 2004-07-15 |
EP0744435A4 (en) | 1997-12-10 |
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