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Method for producing superabsorbent resin

A technology of superabsorbent and surfactant, applied in the field of preparing superabsorbent polymer with high absorption rate, can solve the problem that it is difficult to control the size of pores, superabsorbent polymer cannot obtain absorption rate, and cannot sufficiently increase Superabsorbent polymer absorption surface area and other issues, to achieve the effect of increasing absorption surface area, optimizing porosity, and high absorption rate

Active Publication Date: 2020-07-28
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] As the former method, a method of preparing a superabsorbent polymer by using a foaming agent or the like is conceivable, but bubbles generated by the foaming agent cannot be sufficiently contained inside the superabsorbent polymer, and it is difficult to It is difficult to control the size of the pores formed inside the superabsorbent polymer
Therefore, superabsorbent polymers prepared by the former method cannot achieve the desired level of absorption rate under pressure or without pressure
[0009] Meanwhile, the latter method may not sufficiently increase the absorption surface area of ​​superabsorbent polymers due to technical limitations in controlling superabsorbent polymers to have small particle sizes

Method used

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Examples

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preparation example Construction

[0031] In the production method according to one embodiment, any one or more selected from the following can be used as the water-soluble ethylenically unsaturated monomer: anionic monomers such as acrylic acid, (meth)acrylic acid, maleic anhydride , fumaric acid, crotonic acid, itaconic acid, 2-acryloylethanesulfonic acid, 2-methacryloylethanesulfonic acid, 2-(meth)acryloylpropanesulfonic acid or 2-(meth)acrylamide -2-Methylpropanesulfonic acid, and its salts; nonionic hydrophilic monomers, such as (meth)acrylamide, N-substituted (meth)acrylamide, 2-hydroxyethyl (meth)acrylic acid ester, 2-hydroxypropyl (meth)acrylate, methoxypolyethylene glycol (meth)acrylate or polyethylene glycol (meth)acrylate; and amino-containing unsaturated monomers such as (N ,N)-Dimethylaminoethyl (meth)acrylate or (N,N)-dimethylaminopropyl (meth)acrylamide, and their quaternary ammonium compounds. Among them, acrylic acid or a salt thereof, for example, at least partially neutralized acrylic acid a...

Embodiment 1

[0115] Example 1: Preparation of superabsorbent polymer

[0116] 11 g (110 ppm relative to the monomer composition) of 0.5% IRGACURE 819 initiator diluted with acrylic acid and 26 g of 5% polyethylene glycol diacrylate (PEGDA, molecular weight 400) diluted with acrylic acid were mixed to prepare a solution (solution A).

[0117] 5% trimethylolpropane triacrylate (ethoxylated TMPTA, TMP(EO)9TA, M-3190 Miwon Specialty Chemical Co., Ltd.) containing 9 mol% ethylene oxide diluted with acrylic acid was prepared as a solution (solution B).

[0118] 37 g of solution A and 14 g of solution B were injected into a 2 L volume glass reactor surrounded by a jacket in which a heating medium precooled to 25° C. was circulated. To the glass reactor was added 30 ppm OFX-0193 (XIAMETER(R)) as a silicone based surfactant and mixed, then 800 g of 24% caustic soda solution (Solution C) was slowly added dropwise and mixed. After confirming that the temperature of the mixed solution was raised ...

Embodiment 2

[0122] Example 2: Preparation of superabsorbent polymer

[0123] A surface-crosslinked superabsorbent polymer having a particle size of 150 μm to 850 μm was prepared in the same manner as in Example 1, except that in Example 1 0.8% by weight was used relative to the total monomer mixture of polyvinyl alcohol.

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Abstract

The present invention involves a method for making super absorption resins. The method for making super absorption resin can provide an optimized pore and pore rate to absorb super absorption resin with increased surface area.The ultra -absorbing resin can show a fast absorption rate under pressure and non -pressure.

Description

technical field [0001] Cross References to Related Applications [0002] This application is based on and claims priority from Korean Patent Application No. 10-2015-0085867 filed on June 17, 2015, the disclosure of which is incorporated herein by reference in its entirety. [0003] The present invention relates to a process for the preparation of superabsorbent polymers having a high absorption rate. Background technique [0004] Super Absorbent Polymer (SAP) is a synthetic polymer material capable of absorbing about 500 to 1000 times its own weight in water. Various manufacturers name it by different names, such as SAM (Super Absorbent Material, super absorbent material), AGM (Absorbent Gel Material, absorbent gel material) and the like. Since such superabsorbent polymers began to be practically used in sanitary products, they are now widely used not only in sanitary products such as disposable diapers for children, sanitary napkins, etc., but also in water-retaining soi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F222/14C08F220/06C08F2/10C08L35/02C08L71/02C08L29/04C08J3/075C08J3/24C08J3/12C08F6/00C08J9/04
CPCC08F2/10C08F6/008C08F222/10C08J3/075C08J3/12C08J3/245C08J9/04C08L35/02C08J2335/02C08L2203/14C08F222/102C08L29/04C08L71/02C08F220/06C08F222/103C08J2333/06C08K3/26C08L33/02C08J3/24C08K3/00C08F20/00C08K5/00C08F20/12C08F20/38C08J3/20C08K5/053C08L33/06C08L83/06
Inventor 南惠美李相琪李水珍张太焕黄民浩
Owner LG CHEM LTD
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