WO2021006153A1 - 吸水性樹脂粒子の荷重下吸水量を向上させる方法、及び吸水性樹脂粒子を製造する方法 - Google Patents
吸水性樹脂粒子の荷重下吸水量を向上させる方法、及び吸水性樹脂粒子を製造する方法 Download PDFInfo
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- WO2021006153A1 WO2021006153A1 PCT/JP2020/025849 JP2020025849W WO2021006153A1 WO 2021006153 A1 WO2021006153 A1 WO 2021006153A1 JP 2020025849 W JP2020025849 W JP 2020025849W WO 2021006153 A1 WO2021006153 A1 WO 2021006153A1
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- WIPO (PCT)
- Prior art keywords
- water
- resin particles
- absorbent resin
- powder
- under load
- Prior art date
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- 239000002245 particle Substances 0.000 title claims abstract description 78
- 239000011347 resin Substances 0.000 title claims abstract description 68
- 229920005989 resin Polymers 0.000 title claims abstract description 68
- 239000002250 absorbent Substances 0.000 title claims abstract description 66
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 40
- 238000010521 absorption reaction Methods 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000004519 manufacturing process Methods 0.000 title claims description 4
- 239000000843 powder Substances 0.000 claims abstract description 83
- 230000001133 acceleration Effects 0.000 claims abstract description 7
- -1 N, N-diethylaminoethyl Chemical group 0.000 description 14
- 239000000178 monomer Substances 0.000 description 13
- 229920000642 polymer Polymers 0.000 description 11
- 239000004698 Polyethylene Substances 0.000 description 9
- 229920000573 polyethylene Polymers 0.000 description 9
- 239000003431 cross linking reagent Substances 0.000 description 8
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 6
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 description 6
- 238000005056 compaction Methods 0.000 description 6
- 238000004132 cross linking Methods 0.000 description 6
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 description 5
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 5
- 238000001035 drying Methods 0.000 description 5
- 239000004744 fabric Substances 0.000 description 5
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 4
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 4
- 238000006116 polymerization reaction Methods 0.000 description 4
- 150000003839 salts Chemical class 0.000 description 4
- 230000004580 weight loss Effects 0.000 description 4
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 description 3
- 239000007864 aqueous solution Substances 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 229920001223 polyethylene glycol Polymers 0.000 description 3
- 238000010079 rubber tapping Methods 0.000 description 3
- UWFRVQVNYNPBEF-UHFFFAOYSA-N 1-(2,4-dimethylphenyl)propan-1-one Chemical compound CCC(=O)C1=CC=C(C)C=C1C UWFRVQVNYNPBEF-UHFFFAOYSA-N 0.000 description 2
- IVIDDMGBRCPGLJ-UHFFFAOYSA-N 2,3-bis(oxiran-2-ylmethoxy)propan-1-ol Chemical compound C1OC1COC(CO)COCC1CO1 IVIDDMGBRCPGLJ-UHFFFAOYSA-N 0.000 description 2
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 2
- WERYXYBDKMZEQL-UHFFFAOYSA-N butane-1,4-diol Chemical compound OCCCCO WERYXYBDKMZEQL-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000010528 free radical solution polymerization reaction Methods 0.000 description 2
- 125000000524 functional group Chemical group 0.000 description 2
- 239000010954 inorganic particle Substances 0.000 description 2
- 239000000314 lubricant Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 239000011780 sodium chloride Substances 0.000 description 2
- 238000010558 suspension polymerization method Methods 0.000 description 2
- SYEWHONLFGZGLK-UHFFFAOYSA-N 2-[1,3-bis(oxiran-2-ylmethoxy)propan-2-yloxymethyl]oxirane Chemical compound C1OC1COCC(OCC1OC1)COCC1CO1 SYEWHONLFGZGLK-UHFFFAOYSA-N 0.000 description 1
- HDPLHDGYGLENEI-UHFFFAOYSA-N 2-[1-(oxiran-2-ylmethoxy)propan-2-yloxymethyl]oxirane Chemical compound C1OC1COC(C)COCC1CO1 HDPLHDGYGLENEI-UHFFFAOYSA-N 0.000 description 1
- KFNAHVKJFHDCSK-UHFFFAOYSA-N 2-[2-(4,5-dihydro-1,3-oxazol-2-yl)ethyl]-4,5-dihydro-1,3-oxazole Chemical compound N=1CCOC=1CCC1=NCCO1 KFNAHVKJFHDCSK-UHFFFAOYSA-N 0.000 description 1
- YVHUUEPYEDOELM-UHFFFAOYSA-N 2-ethylpropanedioic acid;piperidin-1-id-2-ylmethylazanide;platinum(2+) Chemical compound [Pt+2].[NH-]CC1CCCC[N-]1.CCC(C(O)=O)C(O)=O YVHUUEPYEDOELM-UHFFFAOYSA-N 0.000 description 1
- 125000000954 2-hydroxyethyl group Chemical group [H]C([*])([H])C([H])([H])O[H] 0.000 description 1
- AUZRCMMVHXRSGT-UHFFFAOYSA-N 2-methylpropane-1-sulfonic acid;prop-2-enamide Chemical compound NC(=O)C=C.CC(C)CS(O)(=O)=O AUZRCMMVHXRSGT-UHFFFAOYSA-N 0.000 description 1
- GVNWZKBFMFUVNX-UHFFFAOYSA-N Adipamide Chemical compound NC(=O)CCCCC(N)=O GVNWZKBFMFUVNX-UHFFFAOYSA-N 0.000 description 1
- BRLQWZUYTZBJKN-UHFFFAOYSA-N Epichlorohydrin Chemical compound ClCC1CO1 BRLQWZUYTZBJKN-UHFFFAOYSA-N 0.000 description 1
- KMTRUDSVKNLOMY-UHFFFAOYSA-N Ethylene carbonate Chemical compound O=C1OCCO1 KMTRUDSVKNLOMY-UHFFFAOYSA-N 0.000 description 1
- 239000005057 Hexamethylene diisocyanate Chemical group 0.000 description 1
- CERQOIWHTDAKMF-UHFFFAOYSA-M Methacrylate Chemical compound CC(=C)C([O-])=O CERQOIWHTDAKMF-UHFFFAOYSA-M 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 229920003171 Poly (ethylene oxide) Polymers 0.000 description 1
- 239000002202 Polyethylene glycol Substances 0.000 description 1
- ZJCCRDAZUWHFQH-UHFFFAOYSA-N Trimethylolpropane Chemical compound CCC(CO)(CO)CO ZJCCRDAZUWHFQH-UHFFFAOYSA-N 0.000 description 1
- 230000002745 absorbent Effects 0.000 description 1
- 239000002390 adhesive tape Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 125000003277 amino group Chemical group 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000012662 bulk polymerization Methods 0.000 description 1
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 239000002738 chelating agent Substances 0.000 description 1
- 238000007596 consolidation process Methods 0.000 description 1
- 229920006037 cross link polymer Polymers 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- GKIPXFAANLTWBM-UHFFFAOYSA-N epibromohydrin Chemical compound BrCC1CO1 GKIPXFAANLTWBM-UHFFFAOYSA-N 0.000 description 1
- 125000003700 epoxy group Chemical group 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 235000011187 glycerol Nutrition 0.000 description 1
- RRAMGCGOFNQTLD-UHFFFAOYSA-N hexamethylene diisocyanate Chemical group O=C=NCCCCCCN=C=O RRAMGCGOFNQTLD-UHFFFAOYSA-N 0.000 description 1
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- IQPQWNKOIGAROB-UHFFFAOYSA-N isocyanate group Chemical group [N-]=C=O IQPQWNKOIGAROB-UHFFFAOYSA-N 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 125000005395 methacrylic acid group Chemical group 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 150000002918 oxazolines Chemical group 0.000 description 1
- 239000002504 physiological saline solution Substances 0.000 description 1
- 229920001495 poly(sodium acrylate) polymer Polymers 0.000 description 1
- 229920000223 polyglycerol Polymers 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- 229920005862 polyol Polymers 0.000 description 1
- 150000003077 polyols Chemical class 0.000 description 1
- 229920001451 polypropylene glycol Polymers 0.000 description 1
- 238000012673 precipitation polymerization Methods 0.000 description 1
- 239000011164 primary particle Substances 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
- NNMHYFLPFNGQFZ-UHFFFAOYSA-M sodium polyacrylate Chemical compound [Na+].[O-]C(=O)C=C NNMHYFLPFNGQFZ-UHFFFAOYSA-M 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- DVKJHBMWWAPEIU-UHFFFAOYSA-N toluene 2,4-diisocyanate Chemical group CC1=CC=C(N=C=O)C=C1N=C=O DVKJHBMWWAPEIU-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
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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
- 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
- B01J20/34—Regenerating or reactivating
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- 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
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- 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
- B01J20/261—Synthetic macromolecular compounds obtained by reactions only involving carbon to carbon unsaturated bonds
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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
- 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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- 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
- 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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- B—PERFORMING OPERATIONS; TRANSPORTING
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- 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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- B—PERFORMING OPERATIONS; TRANSPORTING
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- 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
- B01J20/3035—Compressing
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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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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
- A61F2013/530481—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having superabsorbent materials, i.e. highly absorbent polymer gel materials
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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
- C08J2333/00—Characterised by the use of homopolymers or 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 of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers
- C08J2333/02—Homopolymers or copolymers of acids; Metal or ammonium salts thereof
Definitions
- the present invention relates to a method for improving the amount of water absorption of water-absorbent resin particles under load and a method for producing water-absorbent resin particles.
- Water-absorbent resin particles are widely used in fields such as sanitary materials.
- the water-absorbent resin particles may be required to maintain a large amount of water absorption even under load or pressure (for example, Patent Documents 1 and 2).
- One aspect of the present invention provides a method capable of easily improving the amount of water absorption of water-absorbent resin particles under load.
- One aspect of the present invention relates to a method for improving the amount of water absorption under load of water-absorbent resin particles, which comprises a step of shaking the powder while applying a load to the powder containing a plurality of water-absorbent resin particles.
- Another aspect of the present invention relates to a method for producing water-absorbent resin particles, which comprises a step of improving the water absorption amount of the water-absorbent resin particles under load by the above method.
- the amount of water absorption of the water-absorbent resin particles under load can be easily improved.
- (meth) acrylic means both acrylic and methacrylic.
- acrylate and “methacrylate” are also referred to as “(meth) acrylate”.
- (Poly) shall mean both with and without the "poly” prefix.
- the upper limit value or the lower limit value of the numerical range of one step can be arbitrarily combined with the upper limit value or the lower limit value of the numerical range of another step.
- the upper limit value or the lower limit value of the numerical range may be replaced with the value shown in the examples.
- Water-soluble means that it exhibits a solubility in water of 5% by mass or more at 25 ° C.
- the materials exemplified in the present specification may be used alone or in combination of two or more.
- “Saline” refers to a 0.9% by mass sodium chloride aqueous solution.
- FIG. 1 is a schematic view showing an embodiment of a step of shaking a powder containing a plurality of water-absorbent resin particles.
- the powder 1 contained in the container 3 is shaken.
- the container 3 is arranged on the support 5, and the powder 1 in the container 3 can be shaken by the vibration of the support 5.
- a load is applied to the entire powder 1 by the weight 7 arranged on the upper part of the container 3.
- the powder 1 is typically composed of substantially only water-absorbent resin particles, but other particles may be contained in the powder 1.
- the ratio of the water-absorbent resin particles to the total amount of the powder 1 may be 80 to 100% by mass, 90 to 100% by mass, or 95 to 100% by mass.
- the container 3 is not particularly limited as long as it can accommodate the powder 1 and can apply a load to the powder 1.
- the container 3 may be, for example, a wooden box, a cardboard box, a plastic bag, or a cloth bag. If the container 3 is a flexible bag such as a plastic bag or a cloth bag, a load can be particularly easily applied to the powder 1 by placing the weight 7 on the container 3.
- the container 3 may have a lid that can be opened and closed. In that case, the powder 1 may be shaken with the lid closed, that is, with the powder 1 sealed in the container 3. The powder 1 may be shaken while transporting the container 3 containing the powder 1.
- the magnitude of the load applied to the powder 1 by the weight 7 is not particularly limited, but may be, for example, such that a pressure of 1.0 to 20.0 kPa is applied to the entire powder 1.
- a pressure applied to the powder 1 is within this range, it is possible to particularly effectively improve the water absorption amount of the water-absorbent resin particles under load while suppressing damage to the water-absorbent resin particles constituting the powder 1. ..
- the pressure applied to the entire powder 1 may be 2.5 to 15.0 kPa or 5.0 to 12.0 kPa.
- the container 3 is a flexible bag and a load is applied to the entire powder 1 by a weight 7 placed on the container 3, the horizontally projected area of the powder 1 in a state of being contained in the container 3 is determined.
- the method of applying a load to the powder containing the water-absorbent resin particles is not limited to the method of placing a weight on the top of the container.
- a load may be applied to the powder containing the water-absorbent resin particles by stacking another container containing the powder containing the water-absorbent resin particles.
- the powder 1 may completely fill the container 3, or the amount of the powder 1 may be somewhat smaller than the capacity of the container 3 as long as the powder 1 can be appropriately loaded.
- the volume of the container in which the powder containing the water-absorbent resin particles is housed for shaking is not particularly limited, but may be, for example, 10 mL to 2000 L.
- the total mass of the powder to be shaken is not particularly limited, but may be, for example, 10 g to 2000 kg.
- the maximum value of acceleration received by the shaken powder may be 0.050 to 4.0 G. When the acceleration is within this range, the amount of water absorption under load tends to improve more significantly. From the same viewpoint, the maximum value of acceleration may be 0.10 to 3.0 G, 0.30 to 2.5 G, 0.5 to 2.5 G, or 1.0 G to 2.5 G. The maximum value of acceleration can be calculated based on the amplitude and frequency of vibration for shaking.
- the time for shaking the powder containing the water-absorbent resin particles may be a length that improves the amount of water absorption under load of the water-absorbent resin particles, and is, for example, 10 minutes or more, 20 minutes or more, or 30 minutes. It may be more than a minute or less than 24 hours. It is not necessary to continuously shake the powder contained in the container, and the powder may be shaken intermittently while the shaking is stopped one or more times in the middle. When the water-absorbent resin particles are shaken intermittently, the total shaking time may be within the above range.
- the amount of water absorption under load of the water-absorbent resin particles after shaking may be, for example, 15 to 30 g / g.
- the ratio of the water absorption amount of the water-absorbent resin particles after shaking to the water absorption amount under load of the water-absorbent resin particles before shaking may be 103% or more, 105% or more, or 110% or more. It may be 150% or less.
- the amount of water absorption under load here is a value measured by the method described in Examples described later.
- the water-absorbent resin particles are not particularly limited, but may be particles containing a polymer containing an ethylenically unsaturated monomer as a monomer unit.
- the ethylenically unsaturated monomer may be a water-soluble monomer, and examples thereof include (meth) acrylic acid and salts thereof, 2- (meth) acrylamide-2-methylpropanesulfonic acid and its salts.
- the ethylenically unsaturated monomer may be used alone or in combination of two or more.
- the water-absorbent resin particles may be particles containing a polymer containing at least one of (meth) acrylic acid or a salt of (meth) acrylic acid as a monomer unit.
- the polymer constituting the water-absorbent resin particles may be a crosslinked polymer.
- the polymer may be crosslinked by self-crosslinking, cross-linking by reaction with a cross-linking agent, or both.
- the water-absorbent resin particles may be surface-crosslinked by cross-linking at least the polymer of the surface layer portion with a cross-linking agent.
- the amount of water absorption under load of the surface-crosslinked water-absorbent resin particles can be greatly improved by shaking.
- a cross-linking agent for surface cross-linking is sometimes called a surface cross-linking agent.
- cross-linking agents examples include polyols such as ethylene glycol, propylene glycol, 1,4-butanediol, trimethylolpropane, glycerin, polyoxyethylene glycol, polyoxypropylene glycol, and polyglycerin; (poly) ethylene glycol diglycidyl ether.
- the cross-linking agent is a polyglycidyl compound such as (poly) ethylene glycol diglycidyl ether, (poly) glycerin diglycidyl ether, (poly) glycerin triglycidyl ether, (poly) propylene glycol polyglycidyl ether, and polyglycerol polyglycidyl ether. It may be included. These cross-linking agents may be used alone or in combination of two or more.
- the water-absorbent resin particles may contain various additional components in addition to the polymer of the ethylenically unsaturated monomer.
- additional ingredients include gel stabilizers, metal chelating agents, and fluidity improvers (lubricants).
- Additional components may be placed inside the polymer particles, including the polymer, on the surface of the polymer particles, or both.
- the additional component may be a fluidity improver (lubricant).
- the fluidity improver may contain inorganic particles. Examples of the inorganic particles include silica particles such as amorphous silica.
- the shape of the water-absorbent resin particles is not particularly limited, and may be, for example, substantially spherical, crushed, or granular, and particles in which primary particles having these shapes are aggregated may be formed.
- the medium particle size of the water-absorbent resin particles may be 250 to 850 ⁇ m, 300 to 700 ⁇ m, or 300 to 600 ⁇ m.
- the water-absorbent resin particles are water-absorbent resins containing a polymer containing an ethylenically unsaturated monomer as a monomer unit, for example, by a method including polymerizing a monomer containing an ethylenically unsaturated monomer. It can be produced by a method including a step of obtaining particles and a step of improving the amount of water absorption of the water-absorbent resin particles under load by the method according to the above-described embodiment.
- the monomer polymerization method can be selected from, for example, a reverse phase suspension polymerization method, an aqueous solution polymerization method, a bulk polymerization method, and a precipitation polymerization method.
- a reverse phase suspension polymerization method or an aqueous solution polymerization method may be adopted. If necessary, steps such as a cross-linking reaction during or after the polymerization, particle formation by pulverization, and drying can be carried out by a usual method.
- Surface-crosslinked water-absorbent resin particles can be obtained by the reaction of the particles after polymerization and drying with the surface-crosslinking agent.
- Various absorbent articles such as diapers can be manufactured by using the water-absorbent resin particles having an improved amount of water absorption under load.
- the compactness density of powder composed of water-absorbent resin particles can be determined by the following procedure. It was measured. The compaction density was measured at room temperature (25 ° C. ⁇ 2 ° C.) and humidity of 50% ⁇ 10%. The mass W0 of the cup-shaped container (volume 100 mL, inner diameter about 50 mm, height about 50 mm) in an empty state was measured. Next, a cylindrical cap (inner diameter 51 mm, height 51 mm) was attached to the upper part of the container.
- Theoretical filling factor The theoretical filling factor when a powder composed of water-absorbent resin particles was placed in a polyethylene bag with a zipper was calculated by the following formula.
- Theoretical filling rate [%] ⁇ (X [g] / D [g / mL]) / V [mL] ⁇ x 100
- X is the mass of the powder
- D is the compaction density of the powder
- V is the capacity of the polyethylene bag.
- the volume of the maximum amount of pure water that can be filled in the polyethylene bag with the zipper closed was measured, and this was regarded as the maximum volume of the polyethylene bag.
- FIG. 2 is a schematic view showing a method of measuring the amount of water absorption under load.
- a glass filter 19 (diameter 9 cm, thickness 7 mm, standard: ISO4793, P-250) was placed in a petri dish 17 having an inner diameter of 12 cm. Subsequently, the saline solution 20 was put into the petri dish 17 to the height of the glass filter 19.
- Cylinder 11 (inner diameter 2.0 cm: outer diameter 3.0 cm: height) in which powder 1 composed of water-absorbent resin particles having a mass of X [g] is mounted with a 255 mesh bolting cloth (nylon mesh) 13 at the end. It was evenly placed in 5.0 cm). X here was 0.1000 ⁇ 0.0005 g.
- a cylindrical weight 15 having a mass of applying a pressure of 4.14 kPa to the powder 1 was placed on the powder 1 in the cylinder.
- the weight 15 has an outer diameter slightly smaller than the inner diameter of the cylinder, and can smoothly move in the vertical direction in the cylinder. In this state, the total mass W1 [g] (total mass of powder 1, cylinder 11, bolting cloth 13 and weight 15) was measured.
- the cylinder 11 containing the powder 1 and the weight 15 was placed on the glass filter 19 in the petri dish 17, and the powder 1 was swollen with the physiological saline 20 over 1 hour.
- the total mass W2 [g] of the swelled powder 1, the cylinder 11, the bolting cloth 13 and the weight 15 was measured.
- the dry loss amount A [%] of the powder composed of the water-absorbent resin particles was also separately measured by the method described later.
- the amount of water absorption under load was calculated by the following formula.
- Water-absorbent resin particles Aquakeep SA60SXII (trade name, particles containing sodium polyacrylate) manufactured by Sumitomo Seika Chemical Co., Ltd. was prepared as water-absorbent resin particles.
- the compaction density of the powder composed of the water-absorbent resin particles was 0.83 g / mL.
- the horizontally projected area of the polyethylene bag placed on the saucer was regarded as the acting area where the load was applied to the powder from the weight, and the pressure applied to the entire powder of the water-absorbent resin particles was estimated by the following formula.
- Pressure [kPa] Weight mass [kg] / 3500 [mm 2 ] x 9.81 x 10 3
- this saucer is subjected to vibration including vertical motion for 30 minutes using an electromagnetic vibration type sieve shaker Octagon 200 (manufactured by endcotts) with a vibration intensity set to 1 or 7, and the powder is applied for 30 minutes. Or shake for 300 minutes.
- the calculated value of the acceleration received by the powder is 0.1 G at the maximum when the vibration intensity is 1, and 2.2 G at the maximum when the vibration intensity is 7.
- the amount of water absorption under load of the water-absorbent resin particles after shaking was measured. For comparison, the amount of water absorption under load of the water-absorbent resin particles before shaking was also measured.
- FIG. 3 is a graph showing the relationship between the amount of water absorbed under load and the pressure applied to the powder. It was confirmed that by shaking the powder of the water-absorbent resin particles under a load, the amount of water absorption under load was clearly improved as compared with that before shaking.
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Abstract
Description
圧力=重り質量/粉体の水平投影面積
1-1.吸水性樹脂粒子からなる粉体の固めかさ密度
粉体特性評価装置(ホソカワミクロン株式会社製、型番:PT-X)を用いて、吸水性樹脂粒子からなる粉体の固めかさ密度を以下の手順で測定した。固めかさ密度の測定は室温(25℃±2℃)、湿度50%±10%の条件で行った。
カップ状の容器(容積100mL、内径約50mm、高さ約50mm)の空状態での質量W0を測定した。次に、容器の上部に、円筒状のキャップ(内径51mm、高さ51mm)を取り付けた。キャップの上方開口部から、100gの粉体を、装置附属のスコップによって容器に入れた。続いて、容器をタッピングリフトバー(タッピング装置)に載せ、ストローク18mmの180回のタッピングによって、容器内の粉体に衝撃を加えた。その後、キャップを外してから、容器の上方開口部から盛り上がった部分の粉体を、ブレードで擦り切ることにより除去した。続いて、粉体を含む容器の質量W1を測定した。質量W0及び質量W1に基づき、下記式より固めかさ密度を求めた。固めかさ密度を計3回測定し、その平均値を吸水性樹脂粒子からなる粉体の固めかさ密度D[g/mL]として記録した。
固めかさ密度[g/mL]=(W1[g]-W0[g])/100[mL]
吸水性樹脂粒子からなる粉体をチャック付きポリエチレン袋に入れたときの理論充填率を、下記式により求めた。
理論充填率[%]={(X[g]/D[g/mL])/V[mL]}×100
式中、Xは粉体の質量、Dは粉体の固めかさ密度、Vはポリエチレン袋の容量である。ポリエチレン袋にチャックを閉じた状態で充填可能な最大量の純水の体積を測定し、これをポリエチレン袋の最大容積とみなした。
荷重下吸水量の測定は室温(25℃±2℃)、湿度50%±10%の条件行った。図2は、荷重下吸水量を測定する方法を示す模式図である。内径12cmのシャーレ17内にガラスフィルター19(直径9cm、厚み7mm、規格:ISO4793、P-250)を置いた。続いてシャーレ17に生理食塩水20をガラスフィルター19の高さまで入れた。質量X[g]の吸水性樹脂粒子からなる粉体1を、端部に255メッシュのボルティングクロス(ナイロンメッシュ)13を装着したシリンダー11(内径2.0cm:外径3.0cm:高さ5.0cm)内に均一に入れた。ここでのXは、0.1000±0.0005gとした。シリンダー内の粉体1の上に、粉体1に4.14kPaの圧力が加わる質量を有する円筒状の重り15を置いた。重り15はシリンダー内径よりわずかに小さい外径を有しており、シリンダ内を上下方向にスムーズに動ける。この状態で全体の質量W1[g](粉体1、シリンダー11、ボルティングクロス13及び重り15の合計質量)を測定した。粉体1及び重り15が収容されたシリンダー11を、シャーレ17内のガラスフィルター19上に置き、1時間かけて粉体1を生理食塩水20で膨潤させた。膨潤後の粉体1、シリンダー11、ボルティングクロス13及び重り15の合計質量W2[g]を測定した。吸水性樹脂粒子からなる粉体の乾燥滅量A[%]も後述の方法により別途測定した。下式により荷重下吸水量を算出した。
荷重下吸水量[g/g]=(W2-W1)/{X×(100-A)/100}
荷重下吸水量を5回測定し、得られた測定値の平均値を、吸水性樹脂粒子の荷重下吸水量として記録した。この方法によれば、荷重下吸水量は、乾燥減量の変化による測定値への影響を除去して測定される。そのため、乾燥減量が増加又は減少する場合においても荷重下吸水量の数値を比較することができる。
吸水性樹脂粒子からなる粉体2.0gを、あらかじめ恒量(W3(g))としたアルミホイールケース(8号)にとり、その質量W4(g)を精秤した。精秤された粉体を、内温を105℃に設定した熱風乾燥機(ADVANTEC社製、型式:FV-320)で2時間乾燥させた。粉体をデシケーター中で放冷した後、その質量W5(g)を乾燥質量として測定した。以下の式から、吸水性樹脂粒子の乾燥減量を算出した。
乾燥減量(質量%)=[{(W4-W3)-(W5-W3)}/(W4-W3)]×100
住友精化株式製のアクアキープSA60SXII(商品名、ポリアクリル酸ナトリウムを含む粒子)を吸水性樹脂粒子として準備した。この吸水性樹脂粒子からなる粉体の固めかさ密度は0.83g/mLであった。
吸水性樹脂粒子からなる粉体を、チャック付のポリエチレン袋(チャック内側のサイズ:70mm×50mm、厚さ0.04mm、容量35mL)に充填した。充填される粉体の量は29.05gであり、これは100%の理論充填率に相当する量であった。
粉体が充填されたポリエチレン袋を、JIS Z 8801用受け皿の上に、チャック部分が側方に位置する向きで置いた。受け皿に置かれたポリエチレン袋の上に、1.0kg、2.0kg、3.5kg、又は5.0kgの重り(底面:10×10cm)を載せ、重りをポリエチレン袋に粘着テープで固定した。受け皿に置かれたポリエチレン袋の水平投影面積を、重りから粉体に荷重が加わる作用面積とみなし、下記式によって吸水性樹脂粒子の粉体全体に加わる圧力を見積もった。
圧力[kPa]=重り質量[kg]/3500[mm2]×9.81×103
次いでこの受け皿を、振動強度を1又は7に設定した、電磁振動式ふるい振とう機オクタゴン200(endecotts社製)を用いて30分間、垂直運動を含む振動を与えることにより、粉体を30分間又は300分間振とうした。粉体が受ける加速度の計算値は、振動強度1のときに最大で0.1Gで、振動強度7のときに最大で2.2Gである。振とう後の吸水性樹脂粒子の荷重下吸水量を測定した。比較のため、振とう前の吸水性樹脂粒子の荷重下吸水量も測定した。
Claims (5)
- 複数の吸水性樹脂粒子を含む粉体に荷重を加えながら、前記粉体を振とうする工程を含む、吸水性樹脂粒子の荷重下吸水量を向上させる方法。
- 振とうされる間に前記粉体が受ける加速度の最大値が0.050~4.0Gである、請求項1に記載の方法。
- 前記粉体を振とうする時間が合計で10分以上である、請求項1又は2に記載の方法。
- 前記荷重が、前記粉体全体に1.0~20.0kPaの圧力が加わるように、前記粉体に加えられる、請求項1~3のいずれか一項に記載の方法。
- 請求項1~4のいずれか一項に記載の方法によって吸水性樹脂粒子の荷重下吸水量を向上させる工程を含む、吸水性樹脂粒子を製造する方法。
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CN202080048510.XA CN114080414B (zh) | 2019-07-05 | 2020-07-01 | 提高吸水性树脂颗粒的载荷下吸水量的方法及制造吸水性树脂颗粒的方法 |
EP20837118.7A EP3995529A4 (en) | 2019-07-05 | 2020-07-01 | METHOD FOR IMPROVING WATER ABSORPTION OF WATER-ABSORBING RESIN PARTICLES UNDER LOAD, AND METHOD FOR PRODUCING WATER-ABSORBING RESIN PARTICLES |
JP2021530649A JP7554750B2 (ja) | 2019-07-05 | 2020-07-01 | 吸水性樹脂粒子の荷重下吸水量を向上させる方法、及び吸水性樹脂粒子を製造する方法 |
US17/597,325 US20220314200A1 (en) | 2019-07-05 | 2020-07-01 | Method for improving water absorption of water-absorbent resin particles under load, and method for producing water-absorbent resin particles |
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CN105593119B (zh) * | 2013-09-30 | 2018-11-13 | 株式会社日本触媒 | 颗粒状吸水剂的填充方法和颗粒状吸水剂填充物的取样方法 |
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JP2002212301A (ja) | 2000-10-23 | 2002-07-31 | Nippon Shokubai Co Ltd | 吸水剤およびその製造方法 |
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