WO2016143736A1 - 水性液体吸収性樹脂粒子の製造方法、水性液体吸収性樹脂粒子、吸収体及び吸収性物品 - Google Patents
水性液体吸収性樹脂粒子の製造方法、水性液体吸収性樹脂粒子、吸収体及び吸収性物品 Download PDFInfo
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- resin particles
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- liquid
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- metal salt
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- 150000000996 L-ascorbic acids Chemical class 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- CERQOIWHTDAKMF-UHFFFAOYSA-M Methacrylate Chemical compound CC(=C)C([O-])=O CERQOIWHTDAKMF-UHFFFAOYSA-M 0.000 description 1
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- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
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- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
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- 239000006087 Silane Coupling Agent Substances 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical class OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 125000002252 acyl group Chemical group 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 125000002723 alicyclic group Chemical group 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 1
- 150000001342 alkaline earth metals Chemical class 0.000 description 1
- 150000001336 alkenes Chemical class 0.000 description 1
- XYLMUPLGERFSHI-UHFFFAOYSA-N alpha-Methylstyrene Chemical compound CC(=C)C1=CC=CC=C1 XYLMUPLGERFSHI-UHFFFAOYSA-N 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- LCQXXBOSCBRNNT-UHFFFAOYSA-K ammonium aluminium sulfate Chemical compound [NH4+].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O LCQXXBOSCBRNNT-UHFFFAOYSA-K 0.000 description 1
- 150000003863 ammonium salts Chemical class 0.000 description 1
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- 235000006708 antioxidants Nutrition 0.000 description 1
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- 125000003118 aryl group Chemical group 0.000 description 1
- 229960005070 ascorbic acid Drugs 0.000 description 1
- 239000011668 ascorbic acid Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- ZETCGWYACBNPIH-UHFFFAOYSA-N azane;sulfurous acid Chemical class N.OS(O)=O ZETCGWYACBNPIH-UHFFFAOYSA-N 0.000 description 1
- 150000001541 aziridines Chemical class 0.000 description 1
- 235000019400 benzoyl peroxide Nutrition 0.000 description 1
- 238000004061 bleaching Methods 0.000 description 1
- 150000001669 calcium Chemical class 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 150000007942 carboxylates Chemical group 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 229910052570 clay Inorganic materials 0.000 description 1
- 238000004581 coalescence Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
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- 239000002826 coolant Substances 0.000 description 1
- 125000004093 cyano group Chemical group *C#N 0.000 description 1
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- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- 239000002781 deodorant agent Substances 0.000 description 1
- LSXWFXONGKSEMY-UHFFFAOYSA-N di-tert-butyl peroxide Chemical compound CC(C)(C)OOC(C)(C)C LSXWFXONGKSEMY-UHFFFAOYSA-N 0.000 description 1
- 150000001993 dienes Chemical class 0.000 description 1
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- 150000002367 halogens Chemical group 0.000 description 1
- 239000011121 hardwood Substances 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- XMBWDFGMSWQBCA-UHFFFAOYSA-N hydrogen iodide Chemical compound I XMBWDFGMSWQBCA-UHFFFAOYSA-N 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 1
- 238000007603 infrared drying Methods 0.000 description 1
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- 150000002484 inorganic compounds Chemical class 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000012948 isocyanate Substances 0.000 description 1
- 229940087305 limonene Drugs 0.000 description 1
- 235000001510 limonene Nutrition 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 235000013372 meat Nutrition 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- FQPSGWSUVKBHSU-UHFFFAOYSA-N methacrylamide Chemical compound CC(=C)C(N)=O FQPSGWSUVKBHSU-UHFFFAOYSA-N 0.000 description 1
- 150000007522 mineralic acids Chemical class 0.000 description 1
- 239000012046 mixed solvent Substances 0.000 description 1
- JESXATFQYMPTNL-UHFFFAOYSA-N mono-hydroxyphenyl-ethylene Natural products OC1=CC=CC=C1C=C JESXATFQYMPTNL-UHFFFAOYSA-N 0.000 description 1
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- CCCMONHAUSKTEQ-UHFFFAOYSA-N octadecene Natural products CCCCCCCCCCCCCCCCC=C CCCMONHAUSKTEQ-UHFFFAOYSA-N 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- DCKVFVYPWDKYDN-UHFFFAOYSA-L oxygen(2-);titanium(4+);sulfate Chemical compound [O-2].[Ti+4].[O-]S([O-])(=O)=O DCKVFVYPWDKYDN-UHFFFAOYSA-L 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- YWAKXRMUMFPDSH-UHFFFAOYSA-N pentene Chemical compound CCCC=C YWAKXRMUMFPDSH-UHFFFAOYSA-N 0.000 description 1
- 150000002978 peroxides Chemical class 0.000 description 1
- 235000020030 perry Nutrition 0.000 description 1
- 125000001476 phosphono group Chemical group [H]OP(*)(=O)O[H] 0.000 description 1
- 229920001495 poly(sodium acrylate) polymer Polymers 0.000 description 1
- 229920002239 polyacrylonitrile Polymers 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 229920000166 polytrimethylene carbonate Polymers 0.000 description 1
- 229920006306 polyurethane fiber Polymers 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 150000003109 potassium Chemical class 0.000 description 1
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 description 1
- HJWLCRVIBGQPNF-UHFFFAOYSA-N prop-2-enylbenzene Chemical compound C=CCC1=CC=CC=C1 HJWLCRVIBGQPNF-UHFFFAOYSA-N 0.000 description 1
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 1
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 235000014102 seafood Nutrition 0.000 description 1
- 230000001568 sexual effect Effects 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- CHQMHPLRPQMAMX-UHFFFAOYSA-L sodium persulfate Substances [Na+].[Na+].[O-]S(=O)(=O)OOS([O-])(=O)=O CHQMHPLRPQMAMX-UHFFFAOYSA-L 0.000 description 1
- NNMHYFLPFNGQFZ-UHFFFAOYSA-M sodium polyacrylate Chemical compound [Na+].[O-]C(=O)C=C NNMHYFLPFNGQFZ-UHFFFAOYSA-M 0.000 description 1
- 159000000000 sodium salts Chemical class 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000000600 sorbitol Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 125000001273 sulfonato group Chemical group [O-]S(*)(=O)=O 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 238000010557 suspension polymerization reaction Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 229910000348 titanium sulfate Inorganic materials 0.000 description 1
- XJDNKRIXUMDJCW-UHFFFAOYSA-J titanium tetrachloride Chemical compound Cl[Ti](Cl)(Cl)Cl XJDNKRIXUMDJCW-UHFFFAOYSA-J 0.000 description 1
- VXYADVIJALMOEQ-UHFFFAOYSA-K tris(lactato)aluminium Chemical compound CC(O)C(=O)O[Al](OC(=O)C(C)O)OC(=O)C(C)O VXYADVIJALMOEQ-UHFFFAOYSA-K 0.000 description 1
- 238000001291 vacuum drying Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- 230000004580 weight loss Effects 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
- DUNKXUFBGCUVQW-UHFFFAOYSA-J zirconium tetrachloride Chemical compound Cl[Zr](Cl)(Cl)Cl DUNKXUFBGCUVQW-UHFFFAOYSA-J 0.000 description 1
- ZXAUZSQITFJWPS-UHFFFAOYSA-J zirconium(4+);disulfate Chemical compound [Zr+4].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O ZXAUZSQITFJWPS-UHFFFAOYSA-J 0.000 description 1
Images
Classifications
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- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/22—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising organic material
- B01J20/26—Synthetic macromolecular compounds
- B01J20/265—Synthetic macromolecular compounds modified or post-treated polymers
- B01J20/267—Cross-linked polymers
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- C08J3/24—Crosslinking, e.g. vulcanising, of macromolecules
- C08J3/245—Differential crosslinking of one polymer with one crosslinking type, e.g. surface crosslinking
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- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
- B01J20/28014—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their form
- B01J20/28016—Particle form
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- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/30—Processes for preparing, regenerating, or reactivating
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/04—Acids; Metal salts or ammonium salts thereof
- C08F220/06—Acrylic acid; Methacrylic acid; Metal salts or ammonium salts thereof
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F8/00—Chemical modification by after-treatment
- C08F8/12—Hydrolysis
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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
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/12—Powdering or granulating
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- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
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- C08J3/12—Powdering or granulating
- C08J3/128—Polymer particles coated by inorganic and non-macromolecular organic compounds
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- 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
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/20—Compounding polymers with additives, e.g. colouring
- C08J3/205—Compounding polymers with additives, e.g. colouring in the presence of a continuous liquid phase
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
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- C08K3/10—Metal compounds
- C08K3/105—Compounds containing metals of Groups 1 to 3 or Groups 11 to 13 of the Periodic system
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/10—Metal compounds
- C08K3/11—Compounds containing metals of Groups 4 to 10 or Groups 14 to 16 of the Periodic system
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/0008—Organic ingredients according to more than one of the "one dot" groups of C08K5/01 - C08K5/59
- C08K5/0025—Crosslinking or vulcanising agents; including accelerators
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/05—Alcohols; Metal alcoholates
- C08K5/053—Polyhydroxylic alcohols
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2220/00—Aspects relating to sorbent materials
- B01J2220/50—Aspects relating to the use of sorbent or filter aid materials
- B01J2220/68—Superabsorbents
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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
- C08J2300/00—Characterised by the use of unspecified polymers
- C08J2300/14—Water soluble or water swellable polymers, e.g. aqueous gels
Definitions
- the present invention relates to a method for producing aqueous liquid absorbent resin particles, an aqueous liquid absorbent resin particle obtained by this production method, an absorbent body using the same, and an absorbent article.
- aqueous sanitary materials such as disposable diapers, sanitary napkins, and incontinence pads are widely used as absorbents based on aqueous liquid absorbent resins mainly composed of hydrophilic fibers such as pulp and acrylic acid (salt).
- hydrophilic fibers such as pulp and acrylic acid (salt).
- the crosslink density of the aqueous liquid absorbent resin surface is increased by specifically cross-linking the surface of the SAP (Super Absorbent Polymer) to suppress deformation of the swollen gel surface.
- SAP Super Absorbent Polymer
- a method for efficiently forming a gap is already known (see, for example, Patent Document 1).
- the liquid permeability between the swollen gels is not sufficiently satisfactory only by the conventional surface crosslinking.
- a method of forming a gel gap by suppressing the coalescence of swollen gels by surface treatment with a polymer and (3) a method of adding aluminum sulfate, aluminum lactate, etc. are already known (for example, patent documents) 2, see Patent Literature 3 and Patent Literature 4).
- An object of the present invention is to provide a method for producing water-based liquid absorbent resin particles capable of achieving both liquid permeability between swollen gels and absorption performance under load even after passing through a transport and diaper production process. is there.
- the present invention provides a water-soluble vinyl monomer (a1) and / or a crosslinked polymer having a vinyl monomer (a2) which becomes a water-soluble vinyl monomer (a1) by hydrolysis and a crosslinking agent (b) as essential constituent units (A ) Containing the resin particles (B) using the polyhydric alcohol (c) having 4 or less carbon atoms, the polyvalent metal salt (d) and the polyvalent glycidyl compound (e), the following methods [I] to [III
- Method [I] Method for surface-treating resin particles (B) using a mixed liquid (W1) containing a polyhydric alcohol (c) having 4 or less carbon atoms, a polyvalent metal salt (d), a polyvalent glycidyl compound (e) and water .
- a method comprising any of the following steps (1) to (3): (1) The step of surface-treating the resin particles (B) with the mixed liquid (W2), and then performing the surface treatment with the mixed liquid (W3) with or without heat treatment; (2) The step of surface-treating the resin particles (B) with the mixed solution (W3), and then performing the surface treatment with the mixed solution (W2) with or without heat treatment; (3) The process of surface-treating simultaneously with liquid mixture (W2) and liquid mixture (W3).
- the aqueous liquid absorbent resin particles (P) obtained by the production method of the present invention are broken at the time of transportation or diaper production process because at least a part of the surface thereof is coated with a polyvalent metal salt.
- breaking resistance the absorption under load after passing through the transportation and diaper manufacturing process, and the liquid permeability between swollen gels are very excellent, Even in the situation, stable and excellent absorption performance (for example, liquid diffusibility, absorption speed and absorption amount) is exhibited, and fogging is unlikely to occur.
- the method for producing the aqueous liquid absorbent resin particles (P) of the present invention includes a water-soluble vinyl monomer (a1) and / or a vinyl monomer (a2) that becomes a water-soluble vinyl monomer (a1) by hydrolysis and a crosslinking agent (b).
- the water-soluble vinyl monomer (a1) in the present invention is not particularly limited, and known monomers, for example, at least one water-soluble substituent and an ethylenic group disclosed in paragraphs 0007 to 0023 of Japanese Patent No. 3648553 are disclosed.
- Vinyl monomers having a saturated group for example, anionic vinyl monomers, nonionic vinyl monomers and cationic vinyl monomers
- anionic vinyl monomers disclosed in JP-A-2003-16583, paragraphs 0009 to 0024 nonionic Selected from the group consisting of a carboxylic group, a sulfo group, a phosphono group, a hydroxyl group, a carbamoyl group, an amino group and an ammonio group disclosed in paragraphs 0041 to 0051 of JP-A-2005-75982
- At least one Vinyl monomer having can be used.
- Vinyl monomer (a2) which becomes water-soluble vinyl monomer (a1) by hydrolysis [hereinafter also referred to as hydrolyzable vinyl monomer (a2). ]
- vinyl monomers having at least one hydrolyzable substituent which becomes a water-soluble substituent by hydrolysis disclosed in paragraphs 0024 to 0025 of Japanese Patent No. 3648553,
- At least one hydrolyzable substituent [1,3-oxo-2-oxapropylene (—CO—O—CO—) group, acyl group and cyano group disclosed in paragraphs 0052 to 0055 of JP-A-2005-75982 Vinyl monomer having a group etc.] can be used.
- the water-soluble vinyl monomer means a vinyl monomer that dissolves at least 100 g in 100 g of water at 25 ° C.
- the hydrolyzability in the hydrolyzable vinyl monomer (a2) means a property that is hydrolyzed by the action of water and, if necessary, a catalyst (an acid or a base) to become water-soluble. Hydrolysis of the hydrolyzable vinyl monomer (a2) may be performed either during the polymerization, after the polymerization, or both of these. From the viewpoint of the absorption performance of the resulting aqueous liquid absorbent resin particles (P), polymerization is performed. The latter is preferred.
- water-soluble vinyl monomers (a1) are preferable from the viewpoint of absorption performance, and more preferable are anionic vinyl monomers, carboxy (salt) groups, sulfo (salt) groups, amino groups, carbamoyl groups, and ammonio groups.
- a vinyl monomer having a mono-, di- or tri-alkylammonio group more preferably a vinyl monomer having a carboxy (salt) group or a carbamoyl group, particularly preferably (meth) acrylic acid (salt) and (meta ) Acrylamide, particularly preferred is (meth) acrylic acid (salt), most preferred is acrylic acid (salt).
- the “carboxy (salt) group” means “carboxy group” or “carboxylate group”, and the “sulfo (salt) group” means “sulfo group” or “sulfonate group”.
- (meth) acrylic acid (salt) means acrylic acid, acrylate, methacrylic acid or methacrylate
- (meth) acrylamide means acrylamide or methacrylamide.
- the salt include alkali metal (such as lithium, sodium and potassium) salts, alkaline earth metal (such as magnesium and calcium) salts and ammonium (NH 4 ) salt.
- alkali metal salts and ammonium salts are preferable from the viewpoint of absorption performance and the like, more preferable are alkali metal salts, and particularly preferable are sodium salts.
- the water-soluble vinyl monomer (a1) or the hydrolyzable vinyl monomer (a2) When either the water-soluble vinyl monomer (a1) or the hydrolyzable vinyl monomer (a2) is used as a structural unit, one kind of each may be used alone as a structural unit, and if necessary, two or more kinds may be used as a structural unit. good. The same applies when the water-soluble vinyl monomer (a1) and the hydrolyzable vinyl monomer (a2) are used as constituent units.
- the content molar ratio [(a1) / (a2)] is preferably 75/25 to 99/1. The ratio is more preferably 85/15 to 95/5, particularly preferably 90/10 to 93/7, and most preferably 91/9 to 92/8. Within this range, the absorption performance is further improved.
- crosslinked polymer (A) in addition to the water-soluble vinyl monomer (a1) and the hydrolyzable vinyl monomer (a2), other vinyl monomers (a3) copolymerizable therewith are used as the structural unit. Can do. Other vinyl monomers (a3) may be used alone or in combination of two or more.
- the other copolymerizable vinyl monomer (a3) is not particularly limited, and is known (for example, a hydrophobic vinyl monomer disclosed in paragraphs 0028 to 0029 of Japanese Patent No. 3648553, Japanese Patent Laid-Open No. 2003-165883).
- 0025 paragraph and vinyl monomer disclosed in JP-A-2005-75982, paragraph 0058, etc. can be used.
- the following vinyl monomers (i) to (iii) Can be used.
- Styrene such as styrene, ⁇ -methylstyrene, vinyltoluene and hydroxystyrene, and halogen substituted products of styrene such as vinylnaphthalene and dichlorostyrene.
- C2-C20 aliphatic ethylenic monomer Alkenes (ethylene, propylene, butene, isobutylene, pentene, heptene, diisobutylene, octene, dodecene, octadecene, etc.); and alkadienes (butadiene, isopren
- monoethylenically unsaturated monomer such as pinene, limonene and indene
- polyethylene vinyl monomer such as cyclopentadiene, bicyclopentadiene and ethylidene norbornene.
- the content (mol%) of the other vinyl monomer (a3) unit is based on the total number of moles of the water-soluble vinyl monomer (a1) unit and hydrolyzable vinyl monomer (a2) unit from the viewpoint of absorption performance and the like. 0 to 5, more preferably 0 to 3, particularly preferably 0 to 2, particularly preferably 0 to 1.5. From the viewpoint of absorption performance, the content of other vinyl monomer (a3) units is preferably Most preferably, it is 0 mol%.
- the cross-linking agent (b) is not particularly limited and is known (for example, a cross-linking agent having two or more ethylenically unsaturated groups disclosed in Japanese Patent No. 3648553, paragraphs 0031 to 0034, and a water-soluble substituent.
- a crosslinking agent having at least one functional group and having at least one ethylenically unsaturated group, and a crosslinking agent having at least two functional groups capable of reacting with a water-soluble substituent Japanese Patent Application Laid-Open No.
- Crosslinking agents such as disclosed crosslinkable vinyl monomer can be used to.
- a crosslinking agent having two or more ethylenically unsaturated groups is preferable, and more preferable is triallyl cyanurate, triallyl isocyanurate, and a poly (poly (2) having 2 to 10 carbon atoms).
- Meta) allyl ethers particularly preferred are triallyl cyanurate, triallyl isocyanurate, tetraallyloxyethane and pentaerythritol triallyl ether, most preferred pentaerythritol triallyl ether.
- a crosslinking agent (b) may be used individually by 1 type, or may use 2 or more types together.
- the content (mol%) of the crosslinking agent (b) unit is preferably 0.001 to 5, based on the total number of moles of the water-soluble vinyl monomer (a1) unit and the hydrolyzable vinyl monomer (a2) unit. Preferably it is 0.005 to 3, particularly preferably 0.01 to 1. Within this range, the absorption performance is further improved.
- Examples of the method for producing the resin particles (B) containing the crosslinked polymer (A) include known aqueous solution polymerization (adiabatic polymerization, thin film polymerization, spray polymerization method and the like; JP-A-55-133413), and the like.
- a hydrogel polymer (consisting of a crosslinked polymer and water) obtained by reverse phase suspension polymerization (JP-B-54-30710, JP-A-56-26909, JP-A-1-5808, etc.) Can be obtained by heat drying and grinding if necessary.
- the cross-linked polymer (A) contained in the resin particles (B) may be a single type or a mixture of two or more types.
- the solution polymerization method is preferable, and it is advantageous in terms of production cost because it is not necessary to use an organic solvent. Therefore, the aqueous solution polymerization method is particularly preferable, and the water retention amount is large and water-soluble.
- the aqueous liquid absorptive polymerization method is most preferable because an aqueous liquid absorbent resin with a small amount of components can be obtained and temperature control during polymerization is unnecessary.
- a mixed solvent containing water and an organic solvent can be used.
- the organic solvent include methanol, ethanol, acetone, methyl ethyl ketone, N, N-dimethylformamide, dimethyl sulfoxide, and two or more of these.
- the amount (% by weight) of the organic solvent used is preferably 40 or less, more preferably 30 or less, based on the weight of water.
- a conventionally known radical polymerization catalyst can be used, for example, an azo compound [azobisisobutyronitrile, azobiscyanovaleric acid and 2,2′-azobis (2-amidinopropane) hydrochloride.
- Etc. inorganic peroxides (hydrogen peroxide, ammonium persulfate, potassium persulfate, sodium persulfate, etc.), organic peroxides [benzoyl peroxide, di-t-butyl peroxide, cumene hydroperoxide, succinic acid peroxide, etc.
- Oxides and di (2-ethoxyethyl) peroxydicarbonate, etc.] and redox catalysts alkali metal sulfites or bisulfites, ammonium sulfites, ammonium bisulfites, ascorbic acids and the like, and alkali metal persulfates, Oxidation of ammonium persulfate, hydrogen peroxide and organic peroxides And the like).
- These catalysts may be used alone or in combination of two or more thereof.
- the amount (% by weight) of the radical polymerization catalyst used is preferably from 0.0005 to 5, more preferably from 0.001 to 5, based on the total weight of the water-soluble vinyl monomer (a1) and the hydrolyzable vinyl monomer (a2). 2.
- the polymerization may be performed in the presence of a conventionally known dispersant or surfactant, if necessary.
- a conventionally known dispersant or surfactant if necessary.
- polymerization can be carried out using a conventionally known hydrocarbon solvent such as xylene, normal hexane and normal heptane.
- the polymerization start temperature can be appropriately adjusted depending on the type of catalyst used, but is preferably 0 to 100 ° C., more preferably 5 to 80 ° C.
- the solvent such as an organic solvent and water
- the content (% by weight) of the organic solvent after distillation is preferably 0 to 10, more preferably 0 to 5, particularly preferably based on the weight of the crosslinked polymer (A). Is 0-3, most preferably 0-1. Within this range, the absorption performance of the aqueous liquid absorbent resin particles (P) is further improved.
- the water content (% by weight) after the distillation is preferably 0 to 20, more preferably 1 to 10, particularly preferably 2 to 9, based on the weight of the crosslinked polymer (A). Most preferably, it is 3-8. Within this range, the absorption performance is further improved.
- the hydrogel polymer obtained by polymerization can be shredded as necessary.
- the size (longest diameter) of the gel after chopping is preferably 50 ⁇ m to 10 cm, more preferably 100 ⁇ m to 2 cm, and particularly preferably 1 mm to 1 cm. Within this range, the drying property in the drying process is further improved.
- Shredding can be performed by a known method, and can be performed using a normal shredding device (for example, a bex mill, rubber chopper, pharma mill, mincing machine, impact crusher, and roll crusher). .
- a normal shredding device for example, a bex mill, rubber chopper, pharma mill, mincing machine, impact crusher, and roll crusher.
- the content and water content of the organic solvent were measured using an infrared moisture meter [for example, JE400 manufactured by KETT Co., Ltd .: 120 ⁇ 5 ° C., 30 minutes, atmospheric humidity before heating 50 ⁇ 10% RH, lamp specification 100V , 40 W], from the weight loss of the measurement sample when heated.
- an infrared moisture meter for example, JE400 manufactured by KETT Co., Ltd .: 120 ⁇ 5 ° C., 30 minutes, atmospheric humidity before heating 50 ⁇ 10% RH, lamp specification 100V , 40 W
- a method of distilling off the solvent including water
- a method of distilling (drying) with hot air at a temperature of 80 to 230 ° C. a thin film drying method using a drum dryer heated to 100 to 230 ° C., (heating ) Vacuum drying, freeze drying, infrared drying, decantation, filtration, etc. can be applied.
- Resin particles (B) can be pulverized after drying.
- the pulverization method is not particularly limited, and a normal pulverizer (for example, a hammer pulverizer, an impact pulverizer, a roll pulverizer, and a shet airflow pulverizer) can be used.
- the pulverized crosslinked polymer can be adjusted in particle size by sieving or the like, if necessary.
- the resin particles (B) containing the cross-linked polymer (A) when screened if necessary contain the cross-linked polymer (A) as a main component. Some ingredients may be included.
- the weight average particle diameter ( ⁇ m) of the resin particles (B) is preferably 100 to 800, more preferably 200 to 700, next preferably 250 to 600, particularly preferably 300 to 500, and most preferably 350 to 450. is there. Within this range, the absorption performance is further improved.
- the weight average particle size was measured using a low-tap test sieve shaker and a standard sieve (JIS Z8801-1: 2006), Perry's Chemical Engineers Handbook, 6th edition (Mac Glow Hill Book, 1984). , Page 21). That is, JIS standard sieves are combined in the order of 1000 ⁇ m, 850 ⁇ m, 710 ⁇ m, 500 ⁇ m, 425 ⁇ m, 355 ⁇ m, 250 ⁇ m, 150 ⁇ m, 125 ⁇ m, 75 ⁇ m and 45 ⁇ m, and a tray from the top. About 50 g of the measured particles are put in the uppermost screen and shaken for 5 minutes with a low-tap test sieve shaker.
- the absorption performance is better when the content of the fine particles contained in the resin particles (B) is smaller, it is 106 ⁇ m or less (preferably accounting for the total weight of the resin particles (B) containing the crosslinked polymer (A)).
- the content (% by weight) of the fine particles of 150 ⁇ m or less is preferably 3 or less, more preferably 1 or less.
- the content of the fine particles can be determined using a graph created when determining the above-mentioned weight average particle diameter.
- the shape of the resin particle (B) is not particularly limited, and examples thereof include an irregularly crushed shape, a flake shape, a pearl shape, and a rice grain shape. Among these, from the viewpoint of good entanglement with the fibrous material for use as a disposable diaper and no fear of dropping off from the fibrous material, an irregularly crushed shape is preferable.
- the resin particles (B) containing the crosslinked polymer (A) may be treated with a hydrophobic substance as necessary, and a method described in JP2013-231199A can be used.
- Examples of the polyhydric alcohol (c) having 4 or less carbon atoms in the present invention include ethylene glycol, propylene glycol, 1,3-propanediol, glycerin, 1,4-butanediol and the like. Of these, propylene glycol and glycerin are preferable from the viewpoint of safety and availability, and propylene glycol is more preferable.
- the coverage of the resin particles with the polyvalent metal salt (d) is improved, and the breakage resistance of the resin particles is improved.
- (C) may be used individually by 1 type, and may use 2 or more types together.
- the amount (% by weight) of the polyhydric alcohol (c) having 4 or less carbon atoms is preferably 0.05 to 5 and more preferably based on the weight of the resin particles (B) from the viewpoint of absorption performance and breakage resistance. Is from 0.1 to 3, particularly preferably from 0.2 to 2.
- Examples of the polyvalent metal salt (d) in the present invention include an inorganic acid salt of zirconium, aluminum or titanium.
- Examples of the inorganic acid forming (d) include sulfuric acid, hydrochloric acid, nitric acid, hydrobromic acid, and iodide. Examples include hydrogen acid and phosphoric acid.
- Examples of the inorganic acid salt of zirconium include zirconium sulfate and zirconium chloride.
- Examples of the inorganic acid salt of aluminum include aluminum sulfate, aluminum chloride, aluminum nitrate, ammonium aluminum sulfate, potassium aluminum sulfate, and aluminum aluminum sulfate.
- Examples of the inorganic acid salt of titanium include titanium sulfate, titanium chloride, and titanium nitrate.
- inorganic acid salts of aluminum and inorganic acid salts of titanium are preferable, and aluminum sulfate, aluminum chloride, potassium aluminum sulfate, and sodium aluminum sulfate are particularly preferable.
- aluminum sulfate and sodium aluminum sulfate are particularly preferable.
- the polyvalent metal salt (d) By using the polyvalent metal salt (d), at least a part of the surface of the resin particle (B) is coated with (d), and the fracture resistance of the resin particle is improved.
- (D) may be used individually by 1 type and may use 2 or more types together.
- the use amount (% by weight) of the polyvalent metal salt (d) is preferably 0.05 to 5, more preferably 0.1 based on the weight of the resin particles (B) from the viewpoint of absorption performance and breakage resistance. To 3, particularly preferably 0.2 to 2.
- polyvalent glycidyl compound (e) in the present invention examples include polyglycidyl ethers of polyhydric alcohols such as ethylene glycol diglycidyl ether, glycerin triglycidyl ether, and sorbitol polyglycidyl ether. From the viewpoint of performance, it is from 2 to 8, more preferably from 2 to 3, and the number of glycidyl groups per molecule is preferably from 2 to 10, more preferably from 2 to 4, from the viewpoint of absorption performance. (E) may be used individually by 1 type, and may use 2 or more types together.
- polyhydric alcohols such as ethylene glycol diglycidyl ether, glycerin triglycidyl ether, and sorbitol polyglycidyl ether. From the viewpoint of performance, it is from 2 to 8, more preferably from 2 to 3, and the number of glycidyl groups per molecule is preferably from 2 to 10, more preferably from 2 to 4, from the viewpoint of
- the use amount (% by weight) of the polyvalent glycidyl compound (e) is preferably 0.001 to 3, more preferably 0.005 to 2, particularly preferably 0.005 to 2, based on the weight of the resin particles (B) from the viewpoint of absorption performance. Preferably it is 0.01-1.
- the resin particles (B) containing the crosslinked polymer (A) are surfaced using a polyhydric alcohol (c) having 4 or less carbon atoms, a polyvalent metal salt (d) and a polyvalent glycidyl compound (e).
- a polyhydric alcohol (c) having 4 or less carbon atoms examples include the following methods [I] to [III].
- -Method [I] Method for surface-treating resin particles (B) using a mixed liquid (W1) containing a polyhydric alcohol (c) having 4 or less carbon atoms, a polyvalent metal salt (d), a polyvalent glycidyl compound (e) and water .
- a method comprising any of the following steps (1) to (3): (1) The step of surface-treating the resin particles (B) with the mixed liquid (W2), and then performing the surface treatment with the mixed liquid (W3) with or without heat treatment; (2) The step of surface-treating the resin particles (B) with the mixed solution (W3), and then performing the surface treatment with the mixed solution (W2) with or without heat treatment; (3) The process of surface-treating simultaneously with liquid mixture (W2) and liquid mixture (W3).
- [I] is preferable from the viewpoint of productivity.
- method [I] include, for example, a cylindrical mixer, a screw mixer, a screw extruder, a turbulator, a nauter mixer, a double-arm kneader, a fluid mixer, and a V mixer.
- a mixing device such as a minced mixer, a ribbon type mixer, a fluid type mixer, an airflow type mixer, a rotating disk type mixer, a conical blender and a roll mixer
- Examples thereof include a method in which the mixed liquid (W1) containing the polyvalent metal salt (d), the polyvalent glycidyl compound (e) and water and the resin particles (B) are uniformly mixed.
- the temperature for the surface treatment by the method [I] is not particularly limited, but is preferably 10 to 150 ° C, more preferably 20 to 100 ° C, and particularly preferably 25 to 80 ° C.
- the heating temperature is preferably 100 to 150 ° C., more preferably 110 to 145 ° C., and particularly preferably 125 to 140 ° C. from the viewpoint of breakage resistance of the resin particles. Heating at 150 ° C. or lower is advantageous in terms of equipment because indirect heating using steam is possible, and absorption performance may deteriorate at heating temperatures below 100 ° C.
- the heating time can be appropriately set depending on the heating temperature, but is preferably 5 to 60 minutes, more preferably 10 to 40 minutes from the viewpoint of absorption performance.
- specific examples of the method of surface-treating the resin particles with the mixed liquids (W2) to (W4) include the same methods as the specific examples in the above method [I].
- Examples include a method in which the resin particles (B) are charged into the mixing apparatus, and the mixed liquid (W2) and the mixed liquid (W3), or the mixed liquid (W2) and the mixed liquid (W4) are separately and simultaneously added and uniformly mixed. .
- the heating temperature and the heating time are the same as those described above. This is the same as the heating temperature and heating time in the heat treatment after the surface treatment of [I].
- the step (4) of the method [III] if the heat treatment is performed between the surface treatment with the mixed solution (W2) and the surface treatment with the mixed solution (W4), the fracture resistance is lowered. After the surface treatment with the liquid (W2), it is necessary to perform the surface treatment with the mixed liquid (W4) without performing the heat treatment.
- heat treatment is usually performed.
- the heating temperature and heating time at that time are the same as the heating temperature and heating time in the heat treatment after the surface treatment of the method [I].
- a step of surface-treating the resin particles using the inorganic particles (f) can be included, and the aqueous liquid absorbent resin particles (P) are surface-treated with the inorganic particles (f). It may be.
- surface treatment with inorganic particles (f) liquid permeability is improved.
- Examples of the inorganic particles (f) include colloidal silica, fumed silica, clay and talc. Colloidal silica and silica are preferable from the viewpoint of availability, ease of handling, and absorption performance, and colloidal is more preferable. Silica. (F) may be used individually by 1 type, and may use 2 or more types together.
- the amount (% by weight) of the inorganic particles (f) used is preferably from 0.01 to 5, more preferably from 0.05 to 1, particularly preferably from the viewpoint of absorption performance, based on the weight of the resin particles (B). 0.1 to 0.5.
- the surface treatment with the inorganic particles (f) may be performed on the resin particles (B) containing the crosslinked polymer (A), and the method (II), step (1), step (2), and In the steps (4) and (5) of [III], the resin particles may be applied to the resin particles after the first surface treatment and before the surface treatment, or the above method [I].
- the resin particles after the surface treatment of [III] may be performed.
- the mixed solution (W1) in the method [I] contains the inorganic particles (f), the mixed solution in the method [II] ( W2) and / or a method of containing the inorganic particles (f) in the mixed solution (W3) and a method of containing the inorganic particles (f) in the mixed solution (W2) and / or the mixed solution (W4) in the method [III]. Is preferred.
- the aqueous liquid absorbent resin particles (P) in the present invention may be further subjected to surface crosslinking treatment with a surface crosslinking agent, if necessary.
- a surface crosslinking agent include known polyvalent glycidyl compounds, polyvalent amines, polyvalent aziridine compounds and polyvalent isocyanate compounds described in JP 59-189103 A, JP 58-180233 A and JP Polyhydric alcohols disclosed in JP-A-61-16903, silane coupling agents described in JP-A-61-211305 and JP-A-61-225212, alkylene carbonates described in JP-A-5-508425,
- the polyvalent oxazoline compounds described in JP-A-11-240959 and the polyvalent metals described in JP-A-51-136588 and JP-A-61-257235 can be used.
- polyvalent glycidyl compounds, polyhydric alcohols and polyhydric amines are preferred, polyvalent glycidyl compounds and polyhydric alcohols are more preferred, and many are particularly preferred.
- Valent glycidyl compounds, most preferred are ethylene glycol diglycidyl ethers.
- a surface crosslinking agent may be used individually by 1 type, and may use 2 or more types together.
- the amount (% by weight) of the surface cross-linking agent is not particularly limited because it can be variously changed depending on the type of surface cross-linking agent, the conditions for cross-linking, the target performance, etc. In view of the above, it is preferably 0.001 to 3, more preferably 0.005 to 2, particularly preferably 0.01 to 1, based on the weight of the resin particles (B).
- the surface crosslinking treatment is a surface treatment of resin particles (B) containing a crosslinked polymer (A) with a polyhydric alcohol (c) having 4 or less carbon atoms, a polyvalent metal salt (d) and a polyvalent glycidyl compound (e). It can be performed simultaneously or separately, before or after the surface treatment.
- the method of the surface cross-linking treatment is known (for example, Japanese Patent No. 3648553, Japanese Patent Laid-Open No. 2003-165883, Japanese Patent Laid-Open No. 2005-2005). 75982 and JP-A-2005-95759) can be applied.
- the aqueous liquid absorbent resin particles (P) obtained by the production method of the present invention may contain additives (for example, known (described in JP-A-2003-225565, JP-A-2006-131767, etc.) antiseptics, if necessary) Agents, fungicides, antibacterial agents, antioxidants, ultraviolet absorbers, colorants, fragrances, deodorants, liquid permeability improvers, organic fibrous materials, and the like.
- the content (% by weight) of the additive is preferably 0.001 to 10, more preferably 0.01 to 5, particularly preferably based on the weight of the crosslinked polymer (A).
- it is 0.05 to 1, most preferably 0.1 to 0.5.
- the aqueous liquid absorbent resin particles (P) obtained by the production method of the present invention have at least a part of their surfaces coated with the polyvalent metal salt (d).
- the coverage of the resin particle surface with the polyvalent metal salt (d) is preferably 50 to 100%, more preferably 75 to 100%, particularly preferably 80% to 100%, most preferably from the viewpoint of fracture resistance. Preferably, it is 90% to 100%.
- the coverage is measured by a method described later (that is, for example, an element mapping method using an energy dispersive X-ray analysis method).
- the apparent density (g / ml) of the aqueous liquid absorbent resin particles (P) obtained by the production method of the present invention is preferably 0.54 to 0.70, more preferably 0.56 to 0.65, and particularly preferably. Is 0.58 to 0.60. Within this range, the anti-fogging property of the absorbent article is further improved.
- the apparent density of (P) is measured at 25 ° C. according to JIS K7365: 1999.
- the crosslinking weight having the water-soluble vinyl monomer (a1) and / or the vinyl monomer (a2) that becomes the water-soluble vinyl monomer (a1) by hydrolysis and the crosslinking agent (b) as essential constituent units. 50% to 100% coverage of the particle surface containing the coalesced (A) and the polyvalent metal salt (d) and obtained by elemental mapping using energy dispersive X-ray analysis by the polyvalent metal salt (d) Aqueous liquid absorbent resin particles can be obtained.
- the water absorbent liquid absorbent resin particles may further contain inorganic particles (f).
- the absorber of the present invention contains aqueous liquid absorbent resin particles (P) obtained by the production method of the present invention.
- the aqueous liquid absorbent resin particles (P) may be used alone, or may be used together with other materials as the absorber. Examples of other materials include fibrous materials.
- the structure and production method of the absorbent when used together with the fibrous material are the same as those known (JP 2003-225565 A, JP 2006-131767 A, JP 2005-097569 A, etc.). is there.
- Preferred as the fibrous material are cellulose fibers, organic synthetic fibers, and a mixture of cellulose fibers and organic synthetic fibers.
- cellulosic fibers examples include natural fibers such as fluff pulp, and cellulosic chemical fibers such as viscose rayon, acetate, and cupra.
- raw materials conifers, hardwoods, etc.
- production methods chemical pulp, semi-chemical pulp, mechanical pulp, CTMP, etc.
- bleaching methods etc. of this cellulose-based natural fiber.
- organic synthetic fibers examples include polypropylene fibers, polyethylene fibers, polyamide fibers, polyacrylonitrile fibers, polyester fibers, polyvinyl alcohol fibers, polyurethane fibers, and heat-fusible composite fibers (the above fibers having different melting points). And a fiber obtained by compounding at least two of the above into a sheath core type, an eccentric type, a parallel type, and the like, a fiber obtained by blending at least two kinds of the above fibers, and a fiber obtained by modifying the surface layer of the above fibers).
- fibrous base materials preferred are cellulose-based natural fibers, polypropylene-based fibers, polyethylene-based fibers, polyester-based fibers, heat-fusible composite fibers, and mixed fibers thereof, and more preferable are obtained.
- the fluff pulp, the heat-fusible conjugate fiber, and the mixed fiber thereof are used in that the shape-retaining property of the obtained water-absorbing agent after water absorption is excellent.
- the length and thickness of the fibrous material are not particularly limited and can be suitably used as long as the length is 1 to 200 mm and the thickness is in the range of 0.1 to 100 denier.
- the shape is not particularly limited as long as it is fibrous, and examples thereof include a thin cylindrical shape, a split yarn shape, a staple shape, a filament shape, and a web shape.
- the weight ratio of the aqueous liquid absorbent resin particles (P) to the fibers is It is preferably 40/60 to 90/10, more preferably 70/30 to 80/20.
- the absorbent article of the present invention includes the above-described absorber.
- the absorbent article is applicable not only to sanitary articles such as paper diapers and sanitary napkins, but also to various uses such as absorption of various aqueous liquids described below, use as a retention agent, and use as a gelling agent.
- the manufacturing method and the like of the absorbent article are the same as known ones (described in JP 2003-225565 A, JP 2006-131767 A, JP 2005-097569 A, etc.).
- EDS analysis energy dispersive X-ray analysis
- JSM-7000 An electron microscope “JSM-7000” was set. The magnification was 150 times, one particle was displayed on the screen, and EDS analysis was performed in element mapping mode.
- the detection area of the characteristic element of the polyvalent metal salt (d) (for example, aluminum and sulfur in the case of aluminum sulfate or sodium aluminum sulfate) is S1
- the characteristic element of the aqueous liquid absorbent resin particles (P) usually sodium polyacrylate Since it is a salt, the detection area of sodium
- Coverage (%) (S1 / S0) ⁇ 100
- the coverage of each element was averaged to obtain the coverage. Five grains were measured for one type of measurement sample, and the average value was taken as the coverage of the measurement sample. Note that, as the detection areas S0 and S1, values obtained by outputting frequency distributions of detection intensities of the respective characteristic elements as histograms were used.
- ⁇ Measurement method of water retention amount> 1.00 g of a measurement sample is placed in a tea bag (20 cm long, 10 cm wide) made of a nylon net having a mesh size of 63 ⁇ m (JIS Z8801-1: 2006), and 1,000 ml of physiological saline (saline concentration 0.9%). The sample was immersed for 1 hour without stirring and then pulled up, suspended for 15 minutes and drained. Thereafter, each tea bag was placed in a centrifuge, centrifuged at 150 G for 90 seconds to remove excess physiological saline, and the weight (h1) including the tea bag was measured to obtain the water retention amount from the following formula. In addition, the temperature of the used physiological saline and measurement atmosphere was 25 degreeC +/- 2 degreeC. Water retention amount (g / g) (h1) ⁇ (h2) In addition, (h2) is the weight of the tea bag measured by the same operation as described above when there is no measurement sample.
- a pressure shaft 9 (heavy weight) on which the circular wire mesh 8 (mesh size 150 ⁇ m, diameter 25 mm) is coupled perpendicularly to the wire mesh surface on the swollen gel particles 2. 22 g in length and 47 cm in length) were placed so that the wire mesh and swollen gel particles were in contact with each other, and a weight 10 (88.5 g) was placed on the pressure shaft 9 and allowed to stand for 1 minute.
- ⁇ Breakability test method> A measurement sample was weighed in an amount of 15 g, put into a fiber mixer manufactured by Panasonic, and stirred for 1 second with the low-speed / high-speed switch set at low speed.
- Example 1 Acrylic acid (a1-1) ⁇ Mitsubishi Chemical Co., Ltd., purity 100% ⁇ 131 parts, Cross-linking agent (b-1) ⁇ Pentaerythritol triallyl ether, manufactured by Daiso Co., Ltd. ⁇ 0.44 parts and deionized water 362 The part was kept at 3 ° C. with stirring and mixing. After flowing nitrogen into this mixture to reduce the dissolved oxygen amount to 1 ppm or less, 0.5 part of 1% aqueous hydrogen peroxide solution, 1 part of 2% aqueous ascorbic acid solution and 2% 2,2′-azobisamidinopropane Polymerization was started by adding and mixing 0.1 part of a dihydrochloride aqueous solution. After the temperature of the mixture reached 80 ° C., a water-containing gel was obtained by polymerization at 80 ⁇ 2 ° C. for about 5 hours.
- Example 2 While 100 parts of the resin particles (B-1) obtained in the same manner as in Example 1 were stirred at high speed (high speed stirring turbulizer manufactured by Hosokawa Micron: rotation speed 2000 rpm), a polyhydric alcohol having 4 or less carbon atoms ( a mixed solution of 0.6 part of propylene glycol as c), 0.09 part of ethylene glycol diglycidyl ether and 1.1 part of water as the polyvalent glycidyl compound (e), and a polyhydric alcohol having 4 or less carbon atoms (c ), 0.5 parts of propylene glycol as a polyvalent metal salt, 1.2 parts of sodium aluminum sulfate 12 hydrate as a polyvalent metal salt (d), and 2.3 parts of water are simultaneously added and mixed uniformly. The mixture was heated at 130 ° C. for 30 minutes to obtain aqueous liquid absorbent resin particles (P-2) of the present invention.
- high speed stirring turbulizer manufactured by Hosokawa Micron: rotation speed 2000 rpm high speed stirring
- Example 3 While 100 parts of the resin particles (B-1) obtained in the same manner as in Example 1 were stirred at high speed (high speed stirring turbulizer manufactured by Hosokawa Micron: rotation speed 2000 rpm), a polyhydric alcohol having 4 or less carbon atoms ( c) propylene glycol 0.6 part, polyvalent glycidyl compound (e) 0.09 part ethylene glycol diglycidyl ether, inorganic particles (f) Klebosol 30cal25 (AZ Material colloidal silica) 1 part and water 1.1 parts mixed liquid, 0.5 parts propylene glycol as polyhydric alcohol (c) having 4 or less carbon atoms, sodium aluminum sulfate dodecahydrate 1.2 as polyvalent metal salt (d) And a mixture of 2.3 parts of water and 2.3 parts of water were added at the same time and mixed uniformly, then heated at 130 ° C. for 30 minutes, To obtain a sexual liquid-absorbent resin particles (P-3).
- Example 4 While 100 parts of the resin particles (B-1) obtained in the same manner as in Example 1 were stirred at high speed (high speed stirring turbulizer manufactured by Hosokawa Micron: rotation speed 2000 rpm), a polyhydric alcohol having 4 or less carbon atoms ( After adding a mixed liquid in which 1.2 parts of propylene glycol as c), 0.09 part of ethylene glycol diglycidyl ether as the polyvalent glycidyl compound (e) and 3.5 parts of water were mixed and uniformly mixed, 130 After heating at ° C for 30 minutes and cooling to room temperature, 0.5 parts of propylene glycol as polyhydric alcohol (c) having 4 or less carbon atoms, sodium aluminum sulfate dodecahydrate 1 as polyvalent metal salt (d) A mixture of 2 parts and 2.3 parts of water was added at the same time, mixed uniformly, and then heated at 130 ° C. for 30 minutes to obtain the aqueous liquid absorbent resin particles (P- ) Was obtained.
- Example 5 While 100 parts of the resin particles (B-1) obtained in the same manner as in Example 1 were stirred at high speed (high speed stirring turbulizer manufactured by Hosokawa Micron: rotation speed 2000 rpm), a polyhydric alcohol having 4 or less carbon atoms ( 2.0 parts of propylene glycol as c), 1.2 parts of sodium aluminum sulfate decahydrate as the polyvalent metal salt (d), 0.12 part of ethylene glycol diglycidyl ether as the polyvalent glycidyl compound (e) And a mixed solution of 4.3 parts of water were added and mixed uniformly, and then heated at 130 ° C. for 30 minutes to obtain aqueous liquid absorbent resin particles (P-5) of the present invention.
- high speed stirring turbulizer manufactured by Hosokawa Micron: rotation speed 2000 rpm high speed stirring turbulizer manufactured by Hosokawa Micron: rotation speed 2000 rpm
- a polyhydric alcohol having 4 or less carbon atoms 2.0 parts of propylene glycol as c
- Example 6 While 100 parts of the resin particles (B-1) obtained in the same manner as in Example 1 were stirred at high speed (high speed stirring turbulizer manufactured by Hosokawa Micron: rotation speed 2000 rpm), a polyhydric alcohol having 4 or less carbon atoms ( 4.5 parts of propylene glycol as c), 2.4 parts of sodium aluminum sulfate 12 hydrate as the polyvalent metal salt (d), 0.18 parts of ethylene glycol diglycidyl ether as the polyvalent glycidyl compound (e) Then, a mixed solution in which 6.1 parts of water was mixed was added and mixed uniformly, and then heated at 130 ° C. for 30 minutes to obtain the aqueous liquid absorbent resin particles (P-6) of the present invention.
- high speed stirring turbulizer manufactured by Hosokawa Micron: rotation speed 2000 rpm high speed stirring turbulizer manufactured by Hosokawa Micron: rotation speed 2000 rpm
- a polyhydric alcohol having 4 or less carbon atoms 4.5 parts of
- Example 7 While 100 parts of the resin particles (B-1) obtained in the same manner as in Example 1 were stirred at high speed (high speed stirring turbulizer manufactured by Hosokawa Micron: rotation speed 2000 rpm), a polyhydric alcohol having 4 or less carbon atoms ( 3.0 parts of propylene glycol as c), 3.6 parts of sodium aluminum sulfate decahydrate as the polyvalent metal salt (d), 0.12 part of ethylene glycol diglycidyl ether as the polyvalent glycidyl compound (e) And 7.9 parts of water were added and mixed uniformly, followed by heating at 130 ° C. for 30 minutes to obtain aqueous liquid absorbent resin particles (P-7) of the present invention.
- high speed stirring turbulizer manufactured by Hosokawa Micron: rotation speed 2000 rpm high speed stirring turbulizer manufactured by Hosokawa Micron: rotation speed 2000 rpm
- a polyhydric alcohol having 4 or less carbon atoms 3.0 parts of propylene glycol as c
- Example 8 While 100 parts of the resin particles (B-1) obtained in the same manner as in Example 1 were stirred at high speed (high speed stirring turbulizer manufactured by Hosokawa Micron: rotation speed 2000 rpm), a polyhydric alcohol having 4 or less carbon atoms ( c) 0.2 parts of propylene glycol as the polyvalent metal salt (d) 0.4 parts of sodium aluminum sulfate 12 hydrate, 0.08 parts of ethylene glycol diglycidyl ether as the polyvalent glycidyl compound (e) Then, a mixed solution in which 1.5 parts of water was mixed was added, mixed uniformly, and then heated at 150 ° C. for 30 minutes to obtain aqueous liquid absorbent resin particles (P-8) of the present invention.
- high speed stirring turbulizer manufactured by Hosokawa Micron: rotation speed 2000 rpm high speed stirring turbulizer manufactured by Hosokawa Micron: rotation speed 2000 rpm
- a polyhydric alcohol having 4 or less carbon atoms c
- sodium aluminum sulfate dodecahydrate 1 as a polyvalent metal salt (d) 1 while further stirring at high speed (high speed stirring turbulizer manufactured by Hosokawa Micron: rotation speed 2000 rpm) Add a mixture of 2 parts and 2.3 parts of water, mix uniformly, and then heat at 130 ° C. for 30 minutes to produce a comparative aqueous liquid absorbent resin particle (R-1) was obtained.
- silica (Aerosil 200 manufactured by Aerosil Co.) as inorganic particles (f) was further added while stirring at a high speed (high speed stirring turbulizer manufactured by Hosokawa Micron: rotation speed 2000 rpm). After adding 2 parts and mixing uniformly, the mixture was heated at 130 ° C. for 30 minutes to obtain comparative aqueous liquid absorbent resin particles (R-2).
- Table 1 shows the rate and performance evaluation results (water retention amount before and after the breakability test, absorption amount under load, gel permeability, and change rate of each measured value before and after the breakability test).
- the aqueous liquid absorbent resin particles obtained by the production method of the present invention can achieve both liquid permeability between swollen gels and absorption performance under load, and can be absorbed by applying to various absorbers. Because it can be made into an absorbent article with excellent reversibility and surface dryness, disposable diapers (children's diapers, adult diapers, etc.), napkins (sanitary napkins, etc.), paper towels, pads (for incontinence) It is suitably used for sanitary goods such as a pad and a surgical underpad) and a pet sheet (pet urine absorbing sheet), and is particularly suitable for a paper diaper.
- the aqueous liquid absorbent resin particles obtained by the production method of the present invention are not only sanitary products, but also pet urine absorbents, urine gelling agents for portable toilets, freshness-keeping agents such as fruits and vegetables, and drip absorption for meat and seafood. It is also useful for various applications such as agents, cooling agents, disposable warmers, gelling agents for batteries, water retention agents such as plants and soil, anti-condensation agents, water-stopping materials and packing materials, and artificial snow.
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Abstract
Description
方法[I]:
炭素数4以下の多価アルコール(c)、多価金属塩(d)、多価グリシジル化合物(e)及び水を含有する混合液(W1)を用いて樹脂粒子(B)を表面処理する方法。
方法[II]:
炭素数4以下の多価アルコール(c)、多価グリシジル化合物(e)及び水を含有し、多価金属塩(d)を含有しない混合液(W2)と、炭素数4以下の多価アルコール(c)、多価金属塩(d)及び水を含有し、多価グリシジル化合物(e)を含有しない混合液(W3)とを用いて樹脂粒子(B)を表面処理する方法であって、以下の(1)~(3)の工程のいずれかを含む方法:
(1)混合液(W2)で樹脂粒子(B)を表面処理した後、加熱処理を行い又は加熱処理を行わずに、混合液(W3)で更に表面処理する工程;
(2)混合液(W3)で樹脂粒子(B)を表面処理した後、加熱処理を行い又は加熱処理を行わずに、混合液(W2)で更に表面処理する工程;
(3)混合液(W2)と混合液(W3)で同時に表面処理する工程。
方法[III]:
炭素数4以下の多価アルコール(c)、多価グリシジル化合物(e)及び水を含有し、多価金属塩(d)を含有しない混合液(W2)と、多価金属塩(d)及び水を含有し、炭素数4以下の多価アルコール(c)及び多価グリシジル化合物(e)を含有しない混合液(W4)とを用いて樹脂粒子(B)を表面処理する方法であって、以下の(4)~(6)の工程のいずれかを含む方法:
(4)混合液(W2)で樹脂粒子(B)を表面処理した後、加熱処理を行わずに混合液(W4)で更に表面処理する工程;
(5)混合液(W4)で樹脂粒子(B)を表面処理した後、加熱処理を行い又は加熱処理を行わずに、混合液(W2)で更に表面処理する工程;
(6)混合液(W2)と混合液(W4)で同時に表面処理する工程。
(i)炭素数8~30の芳香族エチレン性モノマー
スチレン、α-メチルスチレン、ビニルトルエン及びヒドロキシスチレン等のスチレン、並びにビニルナフタレン及びジクロルスチレン等のスチレンのハロゲン置換体等。
(ii)炭素数2~20の脂肪族エチレン性モノマー
アルケン(エチレン、プロピレン、ブテン、イソブチレン、ペンテン、ヘプテン、ジイソブチレン、オクテン、ドデセン及びオクタデセン等);並びにアルカジエン(ブタジエン及びイソプレン等)等。
(iii)炭素数5~15の脂環式エチレン性モノマー
モノエチレン性不飽和モノマー(ピネン、リモネン及びインデン等);並びにポリエチレン性ビニルモノマー[シクロペンタジエン、ビシクロペンタジエン及びエチリデンノルボルネン等]等。
水溶液重合を行う場合、有機溶媒の使用量(重量%)は、水の重量を基準として40以下が好ましく、更に好ましくは30以下である。
ラジカル重合触媒の使用量(重量%)は、水溶性ビニルモノマー(a1)及び加水分解性ビニルモノマー(a2)の合計重量に基づいて、0.0005~5が好ましく、更に好ましくは0.001~2である。
・方法[I]:
炭素数4以下の多価アルコール(c)、多価金属塩(d)、多価グリシジル化合物(e)及び水を含有する混合液(W1)を用いて樹脂粒子(B)を表面処理する方法。
・方法[II]:
炭素数4以下の多価アルコール(c)、多価グリシジル化合物(e)及び水を含有し、多価金属塩(d)を含有しない混合液(W2)と、炭素数4以下の多価アルコール(c)、多価金属塩(d)及び水を含有し、多価グリシジル化合物(e)を含有しない混合液(W3)とを用いて樹脂粒子(B)を表面処理する方法であって、以下の(1)~(3)の工程のいずれかを含む方法:
(1)混合液(W2)で樹脂粒子(B)を表面処理した後、加熱処理を行い又は加熱処理を行わずに、混合液(W3)で更に表面処理する工程;
(2)混合液(W3)で樹脂粒子(B)を表面処理した後、加熱処理を行い又は加熱処理を行わずに、混合液(W2)で更に表面処理する工程;
(3)混合液(W2)と混合液(W3)で同時に表面処理する工程。
・方法[III]:
炭素数4以下の多価アルコール(c)、多価グリシジル化合物(e)及び水を含有し、多価金属塩(d)を含有しない混合液(W2)と、多価金属塩(d)及び水を含有し、炭素数4以下の多価アルコール(c)及び多価グリシジル化合物(e)を含有しない混合液(W4)とを用いて樹脂粒子(B)を表面処理する方法であって、以下の(4)~(6)の工程のいずれかを含む方法:
(4)混合液(W2)で樹脂粒子(B)を表面処理した後、加熱処理を行わずに混合液(W4)で更に表面処理する工程;
(5)混合液(W4)で樹脂粒子(B)を表面処理した後、加熱処理を行い又は加熱処理を行わずに、混合液(W2)で更に表面処理する工程;
(6)混合液(W2)と混合液(W4)で同時に表面処理する工程。
なお、方法[II]において混合液(W2)と混合液(W3)で同時に表面処理する方法及び方法[III]において混合液(W2)と混合液(W4)で同時に表面処理する方法としては、上記混合装置に樹脂粒子(B)を仕込み、混合液(W2)と混合液(W3)、又は混合液(W2)と混合液(W4)を別々かつ同時に投入して均一混合する方法が挙げられる。
なお、方法[III]の工程(4)においては、混合液(W2)での表面処理と混合液(W4)での表面処理の間で加熱処理を行うと耐壊れ性が低下するため、混合液(W2)での表面処理後、加熱処理を行わずに混合液(W4)で表面処理する必要がある。
他の材料としては繊維状物等が挙げられる。繊維状物と共に用いた場合の吸収体の構造及び製造方法等は、公知のもの(特開2003-225565号公報、特開2006-131767号公報及び特開2005-097569号公報等)と同様である。
カーボンテープを貼った試料台に測定試料を10粒以上、粒子同士が重ならないように固定し、Oxford社製エネルギー分散型X線分析(EDS分析)装置を付属した、JEOL社製電界放出型走査電子顕微鏡「JSM-7000」にセットした。倍率を150倍にし、粒子1粒を画面に表示し、元素マッピングモードでEDS分析を行った。多価金属塩(d)の特徴元素(例えば、硫酸アルミニウム又は硫酸ナトリウムアルミニウムならばアルミニウム及び硫黄)の検出面積をS1、水性液体吸収性樹脂粒子(P)の特徴元素(通常はポリアクリル酸ナトリウム塩であるため、ナトリウム)の検出面積をS0とし、次式から被覆率を求めた。
被覆率(%)=(S1/S0)×100
特徴元素が複数ある場合はそれぞれの元素の被覆率を平均し被覆率とした。1種類の測定試料につき5粒の測定を行い、平均値を測定試料の被覆率とした。なお、検出面積S0及びS1として、それぞれの特徴元素の検出強度の頻度分布をヒストグラムとして出力した値を用いた。
目開き63μm(JIS Z8801-1:2006)のナイロン網で作製したティーバッグ(縦20cm、横10cm)に測定試料1.00gを入れ、生理食塩水(食塩濃度0.9%)1,000ml中に無撹拌下、1時間浸漬した後引き上げて、15分間吊るして水切りした。その後、ティーバッグごと、遠心分離器にいれ、150Gで90秒間遠心脱水して余剰の生理食塩水を取り除き、ティーバックを含めた重量(h1)を測定し次式から保水量を求めた。なお、使用した生理食塩水及び測定雰囲気の温度は25℃±2℃であった。
保水量(g/g)=(h1)-(h2)
なお、(h2)は、測定試料の無い場合について上記と同様の操作により計測したティーバックの重量である。
目開き63μm(JIS Z8801-1:2006)のナイロン網を底面に貼った円筒型プラスチックチューブ(内径:25mm、高さ:34mm)内に、30メッシュふるいと60メッシュふるいを用いて250~500μmの範囲にふるい分けした測定試料0.16gを秤量し、円筒型プラスチックチューブを垂直にしてナイロン網上に測定試料がほぼ均一厚さになるように整えた後、この測定試料の上に分銅(重量:310.6g、外径:24.5mm、)を乗せた。この円筒型プラスチックチューブ全体の重量(M1)を計量した後、生理食塩水(食塩濃度0.9%)60mlの入ったシャーレ(直径:12cm)の中に測定試料及び分銅の入った円筒型プラスチックチューブを垂直に立ててナイロン網側を下面にして浸し、60分静置した。60分後に、円筒型プラスチックチューブをシャーレから引き上げ、これを斜めに傾けて底部に付着した水を一箇所に集めて水滴として垂らすことで余分な水を除去した後、測定試料及び分銅の入った円筒型プラスチックチューブ全体の重量(M2)を計量し、次式から加圧下吸収量を求めた。なお、使用した生理食塩水及び測定雰囲気の温度は25℃±2℃であった。
荷重下吸収量(g/g)={(M2)-(M1)}/0.16
図1及び図2で示される器具を用いて以下の操作により測定した。
測定試料0.32gを150ml生理食塩水1(食塩濃度0.9%)に30分間浸漬して膨潤ゲル粒子2を調製した。そして、垂直に立てた円筒3{直径(内径)25.4mm、長さ40cm、底部から60mlの位置及び40mlの位置にそれぞれ目盛り線4及び目盛り線5が設けてある。}の底部に、金網6(目開き106μm、JIS Z8801-1:2006)と、開閉自在のコック7(通液部の内径5mm)とを有する濾過円筒管内に、コック7を閉鎖した状態で、調製した膨潤ゲル粒子2を生理食塩水と共に移した後、この膨潤ゲル粒子2の上に円形金網8(目開き150μm、直径25mm)が金網面に対して垂直に結合する加圧軸9(重さ22g、長さ47cm)を金網と膨潤ゲル粒子とが接触するように載せ、更に加圧軸9におもり10(88.5g)を載せ、1分間静置した。引き続き、コック7を開き、濾過円筒管内の液面が60ml目盛り線4から40ml目盛り線5になるのに要する時間(T1;秒)を計測し、次式よりゲル通液速度(ml/min)を求めた。
ゲル通液速度(ml/min)=20ml×60/(T1-T2)
なお、使用する生理食塩水及び測定雰囲気の温度は25℃±2℃で行い、T2は測定試料の無い場合について上記と同様の操作により計測した時間である。
測定試料を15g量り採り、Panasonic社製ファイバーミキサーに入れ、低速・高速の切り替えスイッチを低速として1秒攪拌する処理を行った。
アクリル酸(a1-1){三菱化学株式会社製、純度100%}131部、架橋剤(b-1){ペンタエリスリトールトリアリルエーテル、ダイソ-株式会社製}0.44部及び脱イオン水362部を攪拌・混合しながら3℃に保った。この混合物中に窒素を流入して溶存酸素量を1ppm以下とした後、1%過酸化水素水溶液0.5部、2%アスコルビン酸水溶液1部及び2%の2,2’-アゾビスアミジノプロパンジハイドロクロライド水溶液0.1部を添加・混合して重合を開始させた。混合物の温度が80℃に達した後、80±2℃で約5時間重合することにより含水ゲルを得た。
実施例1と同様にして得られた樹脂粒子(B-1)100部を高速攪拌(細川ミクロン製高速攪拌タービュライザー:回転数2000rpm)しながら、これに炭素数4以下の多価アルコール(c)としてのプロピレングリコール0.6部、多価グリシジル化合物(e)としてのエチレングリコールジグリシジルエーテル0.09部及び水1.1部の混合液と、炭素数4以下の多価アルコール(c)としてのプロピレングリコール0.5部、多価金属塩(d)としての硫酸ナトリウムアルミニウム12水和物1.2部及び水2.3部を混合した混合液を同時に添加し、均一混合した後、130℃で30分間加熱して、本発明の水性液体吸収性樹脂粒子(P-2)を得た。
実施例1と同様にして得られた樹脂粒子(B-1)100部を高速攪拌(細川ミクロン製高速攪拌タービュライザー:回転数2000rpm)しながら、これに炭素数4以下の多価アルコール(c)としてのプロピレングリコール0.6部、多価グリシジル化合物(e)としてのエチレングリコールジグリシジルエーテル0.09部、無機粒子(f)としてのKlebosol30cal25(AZマテリアル社製コロイダルシリカ)1部及び水1.1部を混合した混合液と、炭素数4以下の多価アルコール(c)としてのプロピレングリコール0.5部、多価金属塩(d)としての硫酸ナトリウムアルミニウム12水和物1.2部及び水2.3部を混合した混合液を同時に添加し、均一混合した後、130℃で30分間加熱して、本発明の水性液体吸収性樹脂粒子(P-3)を得た。
実施例1と同様にして得られた樹脂粒子(B-1)100部を高速攪拌(細川ミクロン製高速攪拌タービュライザー:回転数2000rpm)しながら、これに炭素数4以下の多価アルコール(c)としてのプロピレングリコール1.2部、多価グリシジル化合物(e)としてのエチレングリコールジグリシジルエーテル0.09部及び水3.5部を混合した混合液を添加し、均一混合した後、130℃で30分間加熱し、室温まで冷却した後、炭素数4以下の多価アルコール(c)としてのプロピレングリコール0.5部、多価金属塩(d)としての硫酸ナトリウムアルミニウム12水和物1.2部及び水2.3部を混合した混合液を同時に添加し、均一混合した後、130℃で30分間加熱して、本発明の水性液体吸収性樹脂粒子(P-4)を得た。
実施例1と同様にして得られた樹脂粒子(B-1)100部を高速攪拌(細川ミクロン製高速攪拌タービュライザー:回転数2000rpm)しながら、これに炭素数4以下の多価アルコール(c)としてのプロピレングリコール2.0部、多価金属塩(d)としての硫酸ナトリウムアルミニウム12水和物1.2部、多価グリシジル化合物(e)としてのエチレングリコールジグリシジルエーテル0.12部及び水4.3部を混合した混合液を添加し、均一混合した後、130℃で30分間加熱して、本発明の水性液体吸収性樹脂粒子(P-5)を得た。
実施例1と同様にして得られた樹脂粒子(B-1)100部を高速攪拌(細川ミクロン製高速攪拌タービュライザー:回転数2000rpm)しながら、これに炭素数4以下の多価アルコール(c)としてのプロピレングリコール4.5部、多価金属塩(d)としての硫酸ナトリウムアルミニウム12水和物2.4部、多価グリシジル化合物(e)としてのエチレングリコールジグリシジルエーテル0.18部及び水6.1部を混合した混合液を添加し、均一混合した後、130℃で30分間加熱して、本発明の水性液体吸収性樹脂粒子(P-6)を得た。
実施例1と同様にして得られた樹脂粒子(B-1)100部を高速攪拌(細川ミクロン製高速攪拌タービュライザー:回転数2000rpm)しながら、これに炭素数4以下の多価アルコール(c)としてのプロピレングリコール3.0部、多価金属塩(d)としての硫酸ナトリウムアルミニウム12水和物3.6部、多価グリシジル化合物(e)としてのエチレングリコールジグリシジルエーテル0.12部及び水7.9部を混合した混合液を添加し、均一混合した後、130℃で30分間加熱して、本発明の水性液体吸収性樹脂粒子(P-7)を得た。
実施例1と同様にして得られた樹脂粒子(B-1)100部を高速攪拌(細川ミクロン製高速攪拌タービュライザー:回転数2000rpm)しながら、これに炭素数4以下の多価アルコール(c)としてのプロピレングリコール0.2部、多価金属塩(d)としての硫酸ナトリウムアルミニウム12水和物0.4部、多価グリシジル化合物(e)としてのエチレングリコールジグリシジルエーテル0.08部及び水1.5部を混合した混合液を添加し、均一混合した後、150℃で30分間加熱して、本発明の水性液体吸収性樹脂粒子(P-8)を得た。
実施例1と同様にして得られた樹脂粒子(B-1)100部を高速攪拌(細川ミクロン製高速攪拌タービュライザー:回転数2000rpm)しながら、これに、炭素数4以下の多価アルコール(c)としてのプロピレングリコール1.2部、多価グリシジル化合物(e)としてのエチレングリコールジグリシジルエーテル0.09部及び水3.5部を混合した混合液を添加し、均一混合した後、130℃で30分間加熱し、室温まで冷却した後、更に高速攪拌(細川ミクロン製高速攪拌タービュライザー:回転数2000rpm)しながら多価金属塩(d)としての硫酸ナトリウムアルミニウム12水和物1.2部及び水2.3部を混合した混合液を添加し、均一混合した後、130℃で30分間加熱して、比較用の水性液体吸収性樹脂粒子(R-1)を得た。
実施例1と同様にして得られた樹脂粒子(B-1)100部を高速攪拌(細川ミクロン製高速攪拌タービュライザー:回転数2000rpm)しながら、これに、炭素数4以下の多価アルコール(c)としてのプロピレングリコール1.2部、多価グリシジル化合物(e)としてのエチレングリコールジグリシジルエーテル0.09部及び水3.5部を混合した混合液を添加し、均一混合した後、130℃で30分間加熱し、室温まで冷却した後、更に高速攪拌(細川ミクロン製高速攪拌タービュライザー:回転数2000rpm)しながら無機粒子(f)としてのシリカ(アエロジル社製Aerosil200)を0.2部添加し均一混合した後、130℃で30分間加熱して、比較用の水性液体吸収性樹脂粒子(R-2)を得た。
2 含水ゲル粒子
3 円筒
4 底部から60mlの位置の目盛り線
5 底部から40mlの位置の目盛り線
6 金網
7 コック
8 円形金網
9 加圧軸
10 おもり
Claims (7)
- 水溶性ビニルモノマー(a1)及び/又は加水分解により水溶性ビニルモノマー(a1)となるビニルモノマー(a2)並びに架橋剤(b)を必須構成単位とする架橋重合体(A)を含有する樹脂粒子(B)を、炭素数4以下の多価アルコール(c)、多価金属塩(d)及び多価グリシジル化合物(e)を用いて以下の方法[I]~[III]のいずれかで表面処理することを特徴とする水性液体吸収性樹脂粒子(P)の製造方法;
方法[I]:
炭素数4以下の多価アルコール(c)、多価金属塩(d)、多価グリシジル化合物(e)及び水を含有する混合液(W1)を用いて樹脂粒子(B)を表面処理する方法;
方法[II]:
炭素数4以下の多価アルコール(c)、多価グリシジル化合物(e)及び水を含有し、多価金属塩(d)を含有しない混合液(W2)と、炭素数4以下の多価アルコール(c)、多価金属塩(d)及び水を含有し、多価グリシジル化合物(e)を含有しない混合液(W3)とを用いて樹脂粒子(B)を表面処理する方法であって、以下の(1)~(3)の工程のいずれかを含む方法:
(1)混合液(W2)で樹脂粒子(B)を表面処理した後、加熱処理を行い又は加熱処理を行わずに、混合液(W3)で更に表面処理する工程;
(2)混合液(W3)で樹脂粒子(B)を表面処理した後、加熱処理を行い又は加熱処理を行わずに、混合液(W2)で更に表面処理する工程;
(3)混合液(W2)と混合液(W3)で同時に表面処理する工程;
方法[III]:
炭素数4以下の多価アルコール(c)、多価グリシジル化合物(e)及び水を含有し、多価金属塩(d)を含有しない混合液(W2)と、多価金属塩(d)及び水を含有し、炭素数4以下の多価アルコール(c)及び多価グリシジル化合物(e)を含有しない混合液(W4)とを用いて樹脂粒子(B)を表面処理する方法であって、以下の(4)~(6)の工程のいずれかを含む方法:
(4)混合液(W2)で樹脂粒子(B)を表面処理した後、加熱処理を行わずに混合液(W4)で更に表面処理する工程;
(5)混合液(W4)で樹脂粒子(B)を表面処理した後、加熱処理を行い又は加熱処理を行わずに、混合液(W2)で更に表面処理する工程;
(6)混合液(W2)と混合液(W4)で同時に表面処理する工程。 - 無機粒子(f)を用いて樹脂粒子を表面処理する工程を含む請求項1記載の製造方法。
- 方法[I]における混合液(W1)が無機粒子(f)を含有し、方法[II]における混合液(W2)及び/又は混合液(W3)が無機粒子(f)を含有し、方法[III]における混合液(W2)及び/又は混合液(W4)が無機粒子(f)を含有する請求項2記載の製造方法。
- 多価金属塩(d)がジルコニウム、アルミニウム又はチタニウムの無機酸塩である請求項1~3のいずれか記載の製造方法。
- 請求項1~4のいずれか記載の製造方法により得られ、エネルギー分散型X線分析法を用いた元素マッピングにより求められる粒子表面の多価金属塩(d)による被覆率が50~100%である水性液体吸収性樹脂粒子。
- 請求項1~4のいずれか記載の製造方法を用いて製造される水性液体吸収性樹脂粒子を含む吸収体。
- 請求項6記載の吸収体を備えた吸収性物品。
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KR20170125388A (ko) | 2017-11-14 |
EP3269757A1 (en) | 2018-01-17 |
JP6722654B2 (ja) | 2020-07-15 |
CN107428948A (zh) | 2017-12-01 |
KR102577371B1 (ko) | 2023-09-11 |
JPWO2016143736A1 (ja) | 2018-01-25 |
EP3269757A4 (en) | 2019-01-16 |
US20180105655A1 (en) | 2018-04-19 |
MY178845A (en) | 2020-10-20 |
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