Superabsorbent polymer and method for preparing same

A technology of superabsorbent and polymer, applied in the field of superabsorbent polymer and its preparation, capable of solving unasked problems

Pending Publication Date: 2021-08-24
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a specific method that can effectively suppress the rewetting phenomenon has not yet been proposed

Method used

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  • Superabsorbent polymer and method for preparing same
  • Superabsorbent polymer and method for preparing same

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preparation example Construction

[0022] A method of preparing a superabsorbent polymer according to an embodiment of the present invention may include the following steps:

[0023] preparing a base resin in which an acrylic-based monomer having at least partially neutralized acid groups and an internal crosslinking agent are crosslinked; and

[0024] heating the base resin in the presence of a surface crosslinking agent for surface modification of the base resin,

[0025] Wherein the internal crosslinking agent comprises a first epoxy crosslinking agent having an epoxy equivalent weight of 100 g / equivalent or greater to less than 130 g / equivalent and a second epoxy crosslinking agent having an epoxy equivalent weight of 130 g / equivalent or greater .

[0026] In the specification of the present invention, "base resin" or "base resin powder" means a polymer in the form of particles or powder obtained by polymerizing a water-soluble ethylenically unsaturated monomer followed by drying and pulverization. "Base ...

Embodiment 1

[0122] (1) Preparation of base resin

[0123] 518g of acrylic acid, 1.40g (0.27 parts by weight relative to 100 parts by weight of acrylic acid) ethylene glycol diglycidyl ether (EGDGE, epoxy equivalent weight is 113g / equivalent), 0.052g (0.27 parts by weight relative to 100 parts by weight of acrylic acid) 0.01 parts by weight) poly(ethylene glycol) diglycidyl ether (PEGDGE, epoxy equivalent weight 185 g / equivalent) with 4 ethylene glycol repeating units and 0.04 g diphenyl (2,4,6-trimethyl (((2)-benzoyl)-phosphine oxide was added to a 3 L glass vessel equipped with a stirrer, nitrogen feeder, and thermometer and dissolved. Then, 822.2 g of a 24.5% sodium hydroxide solution was added thereto, and nitrogen gas was continuously injected to prepare a water-soluble unsaturated monomer aqueous solution. The aqueous solution of the water-soluble unsaturated monomer was cooled to 40°C.

[0124] 500 g of this aqueous solution was fed into a stainless steel container with a width of...

Embodiment 2

[0128] Superabsorbent polymer powder was obtained in the same manner as in Example 1, except that, in step (1), 0.23 parts by weight of ethylene glycol diglycidyl ether and 100 parts by weight of acrylic acid were used. 0.05 parts by weight of poly(ethylene glycol) diglycidyl ether having 4 ethylene glycol repeating units.

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Abstract

The present invention relates to a method for preparing a superabsorbent polymer and a superabsorbent polymer prepared using the preparation method, and more specifically relates to a method for preparing a superabsorbent polymer comprising the steps of: preparing a base resin in which an internal crosslinking agent and an acrylic acid monomer are crosslink polymerized, the acrylic acid monomer having an acidic group of which at least a part has been neutralized; and surface-modifying the base resin by increasing the temperature of the base resin in the presence of a surface crosslinking agent, wherein the internal crosslinking agent comprises a first epoxy crosslinking agent having an epoxy equivalent weight of 100-130g / eq and a second epoxy crosslinking agent having an epoxy equivalent weight of 130g / eq. The present invention also relates to a superabsorbent polymer prepared using the preparation method. The method for preparing a superabsorbent polymer according to the present invention can provide a superabsorbent polymer having improved rewettability and liquid permeability.

Description

technical field [0001] Cross References to Related Applications [0002] This application is based on and claims priority to Korean Patent Applications No. 10-2019-0114795 and No. 10-2020-0118534 filed on September 18, 2019 and September 15, 2020, respectively, the disclosures of which are hereby adopted This reference is incorporated herein in its entirety. [0003] The present invention relates to superabsorbent polymers and methods for their preparation. More particularly, the present invention relates to superabsorbent polymers having excellent basic absorbent properties such as water retention capacity while having improved rewet characteristics and liquid permeability, and methods for their preparation. Background technique [0004] Super Absorbent Polymer (SAP) is a synthetic polymer material that can absorb 500 to 1000 times its own weight in water. Each manufacturer names it differently, for example, SAM (SuperAbsorbency Material, super absorbent material), AGM ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/24C08L33/02C08K5/1515C08F120/06
CPCC08J3/24C08F120/06C08J2333/02C08F2/10C08J3/245C08J3/12C08J2333/08C08J3/075C08J3/243C08F8/14C08F220/06C08K5/06C08F20/04C08F2/44C08J2205/022C08F2810/20B01J20/267B01J20/3021B01J20/3085
Inventor 许荣宰安泰彬朴东薰柳智惠
Owner LG CHEM LTD
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