KR20110133976A - Process for preparing water absorbent resin using hydrolysis catalyst - Google Patents
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- KR20110133976A KR20110133976A KR1020100053694A KR20100053694A KR20110133976A KR 20110133976 A KR20110133976 A KR 20110133976A KR 1020100053694 A KR1020100053694 A KR 1020100053694A KR 20100053694 A KR20100053694 A KR 20100053694A KR 20110133976 A KR20110133976 A KR 20110133976A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F2/00—Processes of polymerisation
- C08F2/04—Polymerisation in solution
- C08F2/10—Aqueous solvent
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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
- C08F20/00—Homopolymers and 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
- C08F20/02—Monocarboxylic acids having less than ten carbon atoms, Derivatives thereof
- C08F20/10—Esters
- C08F20/12—Esters of monohydric alcohols or phenols
- C08F20/16—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms
- C08F20/18—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms with acrylic or methacrylic acids
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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
- C08J3/02—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques
- C08J3/03—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in aqueous media
- C08J3/075—Macromolecular gels
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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
- C08J3/24—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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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L33/00—Compositions 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; Compositions of derivatives of such polymers
- C08L33/04—Homopolymers or copolymers of esters
- C08L33/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, which oxygen atoms are present only as part of the carboxyl radical
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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
- C08J2333/04—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 esters
- C08J2333/06—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 esters of esters containing only carbon, hydrogen, and oxygen, the oxygen atom being present only as part of the carboxyl radical
Abstract
Description
The present invention uses a polyhydric alcohol compound which can be hydrolyzed in the presence of a hydrolysis catalyst as an internal crosslinking agent, thereby solving the difficulty of subdividing the gel-type resin of the initial reaction, which is a problem of the conventional method for preparing absorbent resins, and at the same time absorbing capacity. The present invention relates to a method for producing an absorbent resin suitable for mass production, which can improve the efficiency.
Absorption mechanism of the absorbent resin is due to the interaction between the penetration pressure due to the difference in electrical attraction force of the charge of the polymer electrolyte, the affinity between water and the polymer electrolyte, the expansion of the molecule due to the repulsive force between the polymer electrolyte ions, and the expansion inhibition due to crosslinking. Is dominated. That is, the absorbent capacity of the absorbent polymer depends on the affinity and molecular expansion described above, and the rate of absorption depends largely on the penetration pressure of the absorbent polymer itself. Thus, the molecular expansion and penetration pressure of the absorbent polymer chains depend on the crosslinking density and distribution introduced or the type of crosslinking agent.
As the absorbent resin increases, the absorbent resin blocks the flow of the absorbed fluid due to adhesion between the absorbent resin particles swollen to the fluid. In order to improve this, there is a method of obtaining an absorbent resin having a hard particle surface by reacting the surface of the absorbent resin particle with a crosslinking agent. Such core-shell absorbent resins can be made to have an absorbent polymer having excellent absorbency and absorbency under pressure by increasing the permeability of the fluid as well as the absorbency under a certain load.
International Publication No. WO2006 / 62609 discloses an asymmetric polyvinyl based crosslinking agent which can be used as a crosslinking agent of a super absorbent polymer and in which the crosslinking reaction is degraded by heating.
Japanese Patent Laid-Open No. JP2004-315816 discloses an ammonium carboxylate unit by heating an absorbent resin produced by polymerizing and drying an unsaturated carboxylic acid ammonium salt, an unsaturated carboxylic acid alkali metal salt, an unsaturated carboxylic acid, and other monomers, followed by mixing with a surface crosslinking agent. A method of pyrolysing to carboxylic acid units is disclosed.
Japanese Laid-Open Patent Publication JP2006-176570 discloses the preparation of an absorbent resin powder which is pulverized after heating and drying a cross-linked polymer in a hydrogel state in which a water-soluble ethylenically unsaturated monomer is polymerized using a polyglycidyl compound as an internal crosslinking agent and a water-soluble azo radical polymerization initiator. The method is disclosed.
Korea Patent KR831885 discloses a monomer comprising polymerizing a polymerization mixture comprising an ethylenically unsaturated carboxyl containing monomer, a crosslinking agent, a comonomer copolymerizable with the carboxyl containing monomer and a polymerization medium to form a crosslinked hydrogel. A method for producing absorbent resin particles of a crosslinked carboxyl containing polymer having a low content is disclosed.
In order to facilitate the granularity of the gel resin produced by the internal crosslinking reaction during the production process of the absorbent resin, the internal crosslinking degree of the gel resin should be high. However, if the internal crosslinking degree is high, there is a problem of low absorption. That is, it is advantageous to increase the internal crosslinking degree for mass production, but there is a problem that the absorbency decreases when the crosslinking concentration is high.
It is an object of the present invention to solve the difficulty of subdividing the gel-type resin in the early stage of the reaction, which is a problem of the conventional method for preparing the absorbent resin, by using a polyhydric alcohol compound capable of hydrolysis in the presence of a hydrolysis catalyst as an internal crosslinking agent. It is to provide a method for producing an absorbent resin suitable for mass production that can improve the absorbent capacity.
In order to achieve the above object, the present invention comprises the steps of: (a) internally cross-linking a partially neutralized acrylic acid-based aqueous monomer solution containing an acidic group with a polyhydric alcohol type first crosslinking agent to generate a gel resin; (b) subdividing the gel resin to produce a fine gel resin; (c) adding a hydrolysis catalyst to the fine gel resin to produce hydrolyzed microgel resin; (d) drying, pulverizing and classifying the hydrolyzed microgel resin to produce a base resin powder; And (e) surface-crosslinking the base resin powder with a second crosslinking agent to produce an absorbent resin.
The hydrolysis catalyst in the present invention is at least one inorganic acid selected from the group consisting of hydrochloric acid, nitric acid, sulfuric acid, hydrofluoric acid, and phosphoric acid; Or acetic acid, propionic acid, butanoic acid, pentanic acid, hexanoic acid, heptanoic acid, octanoic acid, nonanoic acid, decanoic acid, oxalic acid, maleic acid, maleic anhydride, methylmalonic acid, adipic acid, sebacic acid, gallic acid, butyric acid, Mellitic acid, arachidonic acid, succinic acid, 2-ethylhexanoic acid, oleic acid, stearic acid, linoleic acid, linolenic acid, salicylic acid, benzoic acid, p-aminobenzoic acid, p-toluenesulfonic acid, benzenesulfonic acid, monochloroacetic acid, dichloroacetic acid, trichloro It is preferably at least one organic acid selected from the group consisting of acetic acid, trifluoroacetic acid, formic acid, malonic acid, methanesulfonic acid, phthalic acid, fumaric acid, citric acid and tartaric acid.
In the present invention, the polyhydric alcohol-type first crosslinking agent is ethylene glycol, diethylene glycol, propylene glycol, triethylene glycol, tetraethylene glycol, propane diol, dipropylene glycol, polypropylene glycol, glycerin, polyglycerol, butanediol, heptane It is preferable that it is at least 1 sort (s) chosen from the group which consists of a diol, hexanediol trimethylolpropane, pentaerythritol, and sorbitol.
In the manufacturing method of the present invention, in the step (a), N, N-methylenebisacrylamide, trimethylolpropane tri (meth) acrylate, ethylene glycol di (meth) acrylate, polyethylene glycol (meth) acrylate, propylene Glycol di (meth) acrylate, polypropylene glycol (meth) acrylate, butanediol di (meth) acrylate, butylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, hexanediol Di (meth) acrylate, triethylene glycol di (meth) acrylate, tripropylene glycol di (meth) acrylate, tetraethylene glycol di (meth) acrylate, dipentaerythritol pentaacrylate, glycerin tri (meth) acrylic Latex, pentaerythritol tetraacrylate, triarylamine, ethylene glycol diglycidyl ether, glycerin, and At least one member selected from the group consisting of ethylene carbonate may be internal cross-linking in addition to including.
In the present invention, the acrylic acid monomer is preferably a compound represented by the following formula (1).
[Formula 1]
R 1 -COOM 1
In Formula 1, R 1 is an alkyl group having 2 to 5 carbon atoms including an unsaturated bond, and M 1 is a hydrogen atom, a monovalent or divalent metal, an ammonium group, or an organic amine salt.
In the present invention, the acrylic acid monomer is more preferably at least one selected from the group consisting of acrylic acid, methacrylic acid, and monovalent metal salts, divalent metal salts, ammonium salts and organic amine salts of these acids.
In the present invention, the partially neutralized acrylic acid monomer aqueous solution is preferably 40 to 80 mol% neutralized acrylic acid monomer aqueous solution.
In the present invention, the average particle size of the fine gel resin is preferably 1 to 10 mm.
In the present invention, the average particle size of the base resin powder is preferably 100 to 800 µm.
In the present invention, the second crosslinking agent is ethylene glycol diglycidyl ether, polyethylene glycol diglycidyl ether, glycerol polyglycidyl ether, propylene glycol diglycidyl ether, polypropylene glycol diglycidyl ether, ethylene glycol, Diethylene glycol, propylene glycol, triethylene glycol, tetraethylene glycol, propane diol, dipropylene glycol, polypropylene glycol, glycerin, polyglycerol, butanediol, heptanediol, hexanediol trimethylolpropane, pentaerythritol And at least one member selected from the group consisting of sorbitol, calcium hydroxide, magnesium hydroxide, aluminum hydroxide, iron hydroxide, calcium chloride, magnesium chloride, aluminum chloride, and iron chloride.
In the present invention, the average particle size of the absorbent resin is preferably 150 to 850 μm.
In addition, the present invention is prepared according to the above-described method, and provides an absorbent resin, characterized in that the average particle size is 150 to 850㎛.
As described above, the present invention solves the difficulty of subdividing the gel-type resin in the early stage of the reaction by using a polyhydric alcohol compound capable of hydrolysis in the presence of a hydrolysis catalyst as an internal crosslinking agent, which is a problem of the conventional method for preparing absorbent resins. In addition, it is possible to provide a method for preparing an absorbent resin suitable for mass production, which can improve the absorbent capacity.
1 is a view schematically showing a manufacturing process of an absorbent resin according to an embodiment of the present invention.
Hereinafter, with reference to the accompanying drawings, a preferred embodiment of the method for producing an absorbent resin according to the present invention will be described in detail.
1 is a view schematically showing a process diagram for a method of manufacturing an absorbent resin according to an embodiment of the present invention.
Referring to Figure 1, the method for producing an absorbent resin according to an embodiment of the present invention (S10) is a gel-type resin by internally cross-linking a partially neutralized acrylic acid monomer solution containing an acid group with a polyhydric alcohol type first crosslinking agent Generating (S11); Subdividing the gel resin to produce a fine gel resin (S12); Adding a hydrolysis catalyst to the fine gel resin to generate a hydrolyzed microgel resin (S13); Drying, pulverizing and classifying the hydrolyzed microgel resin to produce a base resin powder (S14); And surface-crosslinking the base resin powder with the second crosslinking agent to generate an absorbent resin (S15).
In a first step, a partially neutralized acrylic acid monomer aqueous solution containing an acid group is internally crosslinked with a polyhydric alcohol type first crosslinking agent to generate a gel resin (S11).
First Bridge
The use of a crosslinking agent in the preparation of the absorbent polymer is necessary to maintain the physical properties of the resulting absorbent polymer. As a crosslinking method of the water absorbent resin, there are a simultaneous crosslinking method capable of introducing crosslinking between chains of the absorbent polymer during polymerization, and a postcrosslinking method of causing crosslinking of functional groups of the absorbent polymer after polymerization.
In this case, in order to reduce the decrease in absorbance due to the increase in the crosslinking density, when using a crosslinking agent having a suitable chain length, it is possible to prepare a water absorbent resin having high absorbency while maintaining excellent gel strength.
The polyhydric alcohol type first crosslinking agent is ethylene glycol, diethylene glycol, propylene glycol, triethylene glycol, tetraethylene glycol, propane diol, dipropylene glycol, polypropylene glycol, glycerin, polyglycerine, butanediol, heptanediol, Hexanediol trimethylolpropane, pentaerythritol and solvitol may be used alone or in combination of two or more, but is not limited thereto.
In this step (S11), N, N-methylenebisacrylamide, trimethylolpropane tri (meth) acrylate, ethylene glycol di (meth) acrylate, polyethylene glycol (meth) acrylate, and propylene glycol di (meth) Acrylate, polypropylene glycol (meth) acrylate, butanediol di (meth) acrylate, butylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, hexanediol di (meth) acrylic Rate, triethylene glycol di (meth) acrylate, tripropylene glycol di (meth) acrylate, tetraethylene glycol di (meth) acrylate, dipentaerythritol pentaacrylate, glycerin tri (meth) acrylate, pentaerythritol Tetraacrylate, triarylamine, ethylene glycol diglycidyl ether, glycerin and ethylene carbonate Absorbent resin may be prepared by crosslinking alone or in addition of two or more kinds.
In this case, the crosslinks not hydrolyzed by the hydrolysis catalyst retain the bonds during hydrolysis.
The content of the first crosslinking agent is preferably 0.001 to 2.0 parts by weight based on 100 parts by weight of the acrylic acid monomer.
In the case of the first crosslinking reaction, the reaction temperature is preferably 20 to 75 ° C, and the polymerization reaction is completed within 1 minute to 4 hours.
Acrylic acid monomer
Acrylic acid monomers represented by the following formula (1) can be used in the method for preparing the absorbent resin of the present invention.
[Formula 1]
R 1 -COOM 1
In Formula 1, R 1 is an alkyl group having 2 to 5 carbon atoms including an unsaturated bond, and M 1 is a hydrogen atom, a monovalent or divalent metal, an ammonium group, or an organic amine salt.
As the acrylic acid monomer, it is more preferable that acrylic acid, methacrylic acid, monovalent metal salts, divalent metal salts, ammonium salts and organic amine salts of these acids be used alone or in combination.
In the present invention, the acrylic acid monomer is used by partially neutralizing with an alkali such as sodium hydroxide, potassium hydroxide, ammonium hydroxide and the like. As alkali, sodium hydroxide which is inexpensive and nontoxic is more preferable.
The degree of neutralization of the acrylic acid monomer is preferably 40 to 80 mol%. In particular, the range of the degree of neutralization varies depending on the final physical properties, but if it exceeds 80 mol%, most of the obtained polymer is dissolved in water, and if it is less than 40 mol%, the absorbency of the polymer is greatly degraded, and the elastic rubber and It shows the same properties.
The acrylic acid monomer content in the acrylic acid monomer aqueous solution is preferably 40 to 95% by weight based on the total weight of the acrylic acid monomer aqueous solution.
This is to avoid the need to remove the unreacted monomer after polymerization by using the gel effect phenomenon that occurs in the polymerization reaction of a high concentration aqueous solution.
The amount of water, which is a solvent, may be preferably used in a weight ratio of 1 to 5 times the content of acrylate, which is a monomer, and the amount of solvent may be determined in consideration of the heat of polymerization.
Initiator
Examples of the polymerization initiator include radical polymerization initiators such as potassium persulfate, sodium persulfate, ammonium persulfate, hydrogen peroxide, t-butylhydroperoxide, and hydrochloride salts of 2,2-azobis-2-amidinopropane and 2-hydroxy-2. A photoinitiator of -methyl-1-phenyl-propan-1-one can be used. These and the reducing agent which accelerates | decomposes the decomposition of a polymerization initiator can be used together, and it can also be set as a redox-type initiator by combining both. As the reducing agent, sulfites such as sodium sulfite and sodium hydrogen sulfite, reducing metals such as ferrous salts, L-ascorbic acid and amines may be used alone or in combination of two or more, but are not limited thereto.
The concentration of the initiator is preferably 0.001 to 1.0 mole parts with respect to 100 mole parts of the total monomers. The initiator may be used together with a redox catalyst, and it is more preferable to use L-ascorbic acid.
In a second step, after the step of producing a gel-type resin (S11) it can be finely divided to form a gel-type resin (S12).
Granularity of Gel Resin
The grinders usable in the present invention for subdividing gel-type resins include shear granulation machines, impact crushers and high speed rotation crushers. Mills imparted with one or more grinders among cutting, shearing, impact and friction may be preferably used, in particular grinders with a cutting or shearing device imparted as a primary function, more preferably The grinder can be used where shearing and cutting effects are expected to be strong. Among the other pulverizers listed above, an apparatus having a grinding effect required by the shear formed by the plurality of rotary blades and the fixed blade is particularly preferred.
The average particle size of the granular gel resin is preferably 1 to 10 mm.
The rotational speed of the rotary blade is preferably 3.0 to 200 m / sec, more preferably 5.0 to 150 m / sec.
In the third step, a hydrolysis catalyst is added to the fine gel resin to produce a hydrolyzed microgel resin (S13).
Hydrolysis Catalyst
Referring to Scheme 1, the hydrolysis catalyst of the present invention hydrolyzes the microgel resin r1 internally crosslinked in the ester reaction in the presence of a hydrolysis catalyst to form a compound (p1) and an alcohol group containing a carboxy group. Decomposition into a compound (p2) containing to lower the internal crosslinking degree of the microgel resin.
Scheme 1
As the hydrolysis catalyst, an acidic or basic hydrolysis catalyst can be used, and an acidic hydrolysis catalyst is more preferable.
As a catalyst, hydrochloric acid, nitric acid, sulfuric acid, hydrofluoric acid, phosphoric acid, acetic acid, propionic acid, butanoic acid, pentanic acid, hexanoic acid, heptanoic acid, octanoic acid, nonanoic acid, decanoic acid, oxalic acid, maleic acid, maleic anhydride, methylmalonic acid, Adipic acid, sebacic acid, gallic acid, butyric acid, melic acid, arachidonic acid, succinic acid, 2-ethylhexanoic acid, oleic acid, stearic acid, linoleic acid, linolenic acid, salicylic acid, benzoic acid, p-aminobenzoic acid, p-toluenesulfonic acid, benzene Sulphonic acid, monochloroacetic acid, dichloroacetic acid, trichloroacetic acid, trifluoroacetic acid, formic acid, malonic acid, methanesulfonic acid, phthalic acid, fumaric acid, citric acid, and tartaric acid may be used alone or in combination of two or more thereof. no.
In a fourth step, the hydrolyzed microgel resin is dried, pulverized and classified to produce a base resin powder (S14).
Drying, grinding and classing
Drying by heating can be accomplished using a common drying apparatus or a heating furnace. As a typical example of the apparatus that can be used for such heat treatment, a grooved type mixing drier, a rotary dryer, a disk dryer, a fluid bed dryer, an airflow dryer, an infrared dryer, or the like can be used.
The same method and apparatus for subdividing the gel resin for the pulverization of the dried fine gel resin may be used.
The average particle size of the base resin powder is preferably 100 to 800 μm, and for this purpose, the ground resin powder is classified to have an average particle size of 100 to 800 μm.
In a fifth step, the base resin powder is cross-linked with the second crosslinking agent to generate an absorbent resin (S15).
Second cross-link
The second crosslinking agent is, for example, ethylene glycol diglycidyl ether, polyethylene glycol diglycidyl ether, glycerol polyglycidyl ether, propylene glycol diglycidyl ether, polypropylene glycol diglycidyl ether, or the like. Epoxy compounds; Ethylene glycol, diethylene glycol, propylene glycol, triethylene glycol, tetra ethylene glycol, propane diol, dipropylene glycol, polypropylene glycol, glycerin, polyglycerol, butanediol, heptanediol, hexanediol trimethylolpropane, Polyhydric alcohol compounds such as pentaerythritol and sorbitol; Alternatively, polyvalent metal compounds such as hydroxides or chlorides such as calcium, magnesium, aluminum and iron may be used alone or in combination of two or more, but are not limited thereto.
The content of the second crosslinking agent is preferably 0.001 to 2.0 parts by weight based on 100 parts by weight of the dry neutralized resin powder.
In the case of the second crosslinking reaction, the reaction temperature is preferably 150 to 250 ° C. The polymerization reaction is completed within 1 minute to 4 hours.
The relative amount of the first crosslinking agent and the second crosslinking agent is determined according to the chain length and type of the crosslinking agent.
According to a preferred embodiment of the present invention is provided an absorbent resin having an average particle size of 150 to 850 ㎛.
Claims (12)
(b) subdividing the gel resin to produce a fine gel resin;
(c) adding a hydrolysis catalyst to the fine gel resin to produce hydrolyzed microgel resin;
(d) drying, pulverizing and classifying the hydrolyzed microgel resin to produce a base resin powder; And
(e) surface-crosslinking the base resin powder with a second crosslinking agent to produce an absorbent resin.
[Formula 1]
R 1 -COOM 1
(In Formula 1, R 1 is an alkyl group having 2 to 5 carbon atoms containing an unsaturated bond, M 1 is a hydrogen atom, a monovalent or divalent metal, an ammonium group or an organic amine salt.)
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US10723860B2 (en) | 2015-12-14 | 2020-07-28 | Lg Chem, Ltd. | Attrition-resistant superabsorbent polymer, method for preparing the same and composition for preparing the same |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US10723860B2 (en) | 2015-12-14 | 2020-07-28 | Lg Chem, Ltd. | Attrition-resistant superabsorbent polymer, method for preparing the same and composition for preparing the same |
| US11111356B2 (en) | 2015-12-14 | 2021-09-07 | Lg Chem, Ltd. | Attrition-resistant superabsorbent polymer, method for preparing the same and composition for preparing the same |
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