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Superabsorbent polymer and method for its preparation

A superabsorbent and polymer technology, applied in the field of superabsorbent polymers and their preparation, can solve the problems of reduced basic absorption capacity, insufficient liquid permeability and gel strength of superabsorbent polymers, and reduced liquid permeability

Active Publication Date: 2020-11-17
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] However, even with these conventional methods, the liquid permeability and gel strength of superabsorbent polymers are insufficient, and in addition, in fact, since the additives are separated from the surface of superabsorbent polymer particles over time, the liquid permeability tends to be greatly reduced. reduce
In addition, when the above-mentioned conventional methods are applied, there is a problem that although the liquid permeability is improved, the basic absorption capacity (such as absorbency under pressure) is lowered.

Method used

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  • Superabsorbent polymer and method for its preparation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0179]500 g of acrylic acid and 3 g of polyethylene glycol diacrylate (Mw=523) were added and mixed. Then, 0.01 g of diphenyl(2,4,6-trimethylbenzoyl)-phosphine oxide was added and dissolved. Then, 896.4 g of a 24.5% by weight aqueous sodium hydroxide solution was added, and nitrogen gas was continuously added to prepare a water-soluble unsaturated monomer aqueous solution. Then, the temperature of the aqueous solution was cooled to 50° C., and the aqueous solution was irradiated with ultraviolet rays for 90 seconds to obtain a hydrogel-like polymer. The obtained hydrogel polymer was pulverized using a pulverizing device. Classification was performed with standard sieves according to ASTM standards to prepare base polymer powders with a particle size of 150 μm to 710 μm. The gel strength of the base polymer powder was measured to be 6588 Pa.

[0180] Then, 0.05 parts by weight of hydrophobic silica particles (DM30S) was added to 100 parts by weight of the prepared base polym...

Embodiment 2

[0183] The superabsorbent polymer of Example 2 was prepared according to the same method and surface crosslinking conditions as in Example 1, except that for the base polymer powder (gel strength: 6588 Pa), 0.05 parts by weight of Aerogel was added instead of the hydrophobic Silica particles DM30S.

[0184] After the above surface cross-linking step, classification was carried out with a standard sieve according to ASTM standards to obtain the polymer powder of Example 2 with a particle size of 150 μm to 710 μm.

Embodiment 3

[0186] The superabsorbent polymer of Example 3 was prepared according to the same method and surface crosslinking conditions as in Example 1, except that for the base polymer powder (gel strength: 6588 Pa), 0.05 parts by weight of R972 was added instead of hydrophobic Silica particles DM30S.

[0187] After the above-mentioned surface crosslinking step, classification was carried out with a standard sieve according to ASTM standards to obtain the polymer powder of Example 3 with a particle size of 150 μm to 710 μm.

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Abstract

The present invention relates to a superabsorbent polymer exhibiting more improved liquid permeability while maintaining excellent absorbency and a method for producing the same. The superabsorbent polymer comprises: a base polymer powder comprising a first crosslinked polymer of water-soluble ethylenically unsaturated monomers having at least partially neutralized acid groups; and a surface crosslinked layer, It is formed on a base polymer powder and comprises a second crosslinked polymer in which the first crosslinked polymer is further crosslinked by an alkylene carbonate having two to five carbon atoms. The superabsorbent polymer satisfies predetermined physical characteristics.

Description

technical field [0001] Cross References to Related Applications [0002] This application claims Korean Patent Application No. 10-2016-0039244 filed with KIPO on March 31, 2016 and Korean Patent Application No. 10-2016-0063524 filed with KIPO on May 24, 2016 Priority and benefit of , the disclosure of which is incorporated herein by reference in its entirety. [0003] The present invention relates to a superabsorbent polymer exhibiting more improved liquid permeability while maintaining excellent absorbency and a method for producing the same. Background technique [0004] Superabsorbent polymer (SAP) is a synthetic polymer material capable of absorbing about 500 times to about 1000 times its own weight of water, and various manufacturers name it differently, such as SAM (Super Absorbency Material, super absorbent material), AGM (Absorbent Gel Material, absorbent gel material), etc. Such superabsorbent polymers started to be practically used in hygiene products, and are ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J3/24C08J3/075C08J3/12C08K3/22C08K3/36C08L33/06C08K3/013
CPCC08F6/008C08F220/06C08L33/02C08J3/245C08J2333/02C08F222/102C08J3/075C08J3/12C08J3/247C08K3/22C08K3/36C08L33/06C08L2312/00C08J2300/14C08K5/1565
Inventor 李惠民徐成钟尹亨起
Owner LG CHEM LTD
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