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Method for preparing super absorbent polymer, and super absorbent polymer

A superabsorbent and polymer technology, applied in the field of superabsorbent polymers, can solve the problems of reduced absorption rate and absorption rate, increased internal crosslink density, etc.

Pending Publication Date: 2020-11-27
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in this case, the internal crosslink density of the base resin powder inside the surface crosslinked layer increases, and the absorption rate and absorption rate tend to decrease

Method used

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  • Method for preparing super absorbent polymer, and super absorbent polymer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0124] [Example 1]: Preparation of superabsorbent polymer

[0125] A base resin powder was prepared in the same manner as in Comparative Example 1, and a surface treatment process using ethylene carbonate was also performed in the same manner as in Comparative Example 1.

[0126] After the surface treatment, the temperature of the superabsorbent polymer was cooled to 90° C., and based on 100 g of superabsorbent polymer was mixed with 2.0 g of 5% by weight sodium hydroxide solution for an additional neutralization process.

[0127] Thereafter, the additionally neutralized superabsorbent polymer was dried in an oven at 40° C. for 30 minutes, and a surface-treated superabsorbent polymer having a particle diameter of 150 μm to 850 μm was obtained using a sieve. Fine powders with a particle size of less than 150 μm are contained in the superabsorbent polymer at less than 2% by weight.

Embodiment 2

[0128] [Example 2]: Preparation of superabsorbent polymer

[0129] A base resin powder was prepared in the same manner as in Comparative Example 1, and a surface treatment process using ethylene carbonate was also performed in the same manner as in Comparative Example 1.

[0130] After the surface treatment, the temperature of the superabsorbent polymer was cooled to 90° C., and based on 100 g of superabsorbent polymer was mixed with 10.0 g of 5% by weight sodium hydroxide solution for an additional neutralization process.

[0131] Thereafter, the additionally neutralized superabsorbent polymer was dried in an oven at 40° C. for 30 minutes, and a surface-treated superabsorbent polymer having a particle diameter of 150 μm to 850 μm was obtained using a sieve. Fine powders with a particle size of less than 150 μm are contained in the superabsorbent polymer at less than 2% by weight.

Embodiment 3

[0132] [Example 3]: Preparation of superabsorbent polymer

[0133] A base resin powder was prepared in the same manner as in Comparative Example 1, and a surface treatment process using ethylene carbonate was also performed in the same manner as in Comparative Example 1.

[0134] After the surface treatment, the temperature of the superabsorbent polymer was cooled to 90° C. and based on 100 g of superabsorbent polymer mixed with 20.0 g of 5% by weight sodium hydroxide solution for an additional neutralization process.

[0135] Thereafter, the additionally neutralized superabsorbent polymer was dried in an oven at 40° C. for 30 minutes, and a surface-treated superabsorbent polymer having a particle diameter of 150 μm to 850 μm was obtained using a sieve. Fine powders with a particle size of less than 150 μm are contained in the superabsorbent polymer at less than 2% by weight.

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Abstract

The present invention provides a method for preparing a super absorbent polymer and a super absorbent polymer prepared thereby, in which a degree of crosslinking a base resin powder and a surface cross linked layer is optimized so that the super absorbent polymer has excellent properties such as basic absorption performance and permeability, simultaneously. A method for preparing a super absorbentpolymer comprises the steps of: forming a hydrogel polymer by subjecting a monomer composition containing a water-soluble ethylenically unsaturated monomer having at least partially neutralized acidic groups and an internal crosslinking agent to crosslinking polymerization; drying, grinding, and classifying the hydrogel polymer to form a base resin powder; and additionally cross linking the surface of the base resin powder in the presence of a surface crosslinking agent to form a surface crosslinked layer, wherein the water-soluble ethylenically unsaturated monomer has a degree of neutralization of less than 70mol% in the hydrogel polymer-forming step and the method further comprises a step of additionally neutralizing the base resin powder by treating the base resin powder with an alkaline solution during or following the surface crosslinked layer-forming step.

Description

technical field [0001] Cross References to Related Applications [0002] This application claims the benefit of Korean Patent Application No. 10-2018-0116453 filed with the Korean Intellectual Property Office on September 28, 2018, the disclosure of which is incorporated herein by reference in its entirety. [0003] The present disclosure relates to a method for producing a superabsorbent polymer having both excellent basic absorption rate and liquid permeability by optimizing the degree of crosslinking of base resin powder and surface crosslinked layer, and the superabsorbent polymer produced thereby . Background technique [0004] Super Absorbent Polymer (SAP) is a synthetic polymer material capable of absorbing 500 to 1000 times its own weight in water. Each manufacturer names it differently, for example, SAM (SuperAbsorbency Material, super absorbent material), AGM (Absorbent Gel Material, absorbent gel material) and the like. Such superabsorbent polymers started to ...

Claims

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Application Information

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IPC IPC(8): C08J3/24C08J3/12C08J3/075C08K5/00C08L101/14
CPCC08L101/14C08J3/245C08J2333/02C08J3/12C08J3/075C08K5/0025C08J2300/14C08J3/24C08J2323/06C08L2312/00
Inventor 元泰英李惠民李俊宜许成范辛光寅韩昌薰
Owner LG CHEM LTD
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