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Super absorbent polymer and preparation method for the same

A super-absorbent, polymer technology that is used in absorbent pads, bandages, medical science, etc., and can solve problems such as not raised

Active Publication Date: 2020-07-21
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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  • Super absorbent polymer and preparation method for the same

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preparation example Construction

[0024] A method of preparing a superabsorbent polymer according to one embodiment of the present invention comprises the following steps:

[0025] preparing a base resin by cross-linking polymerization of an acrylic acid-based monomer having at least partially neutralized acid groups and an internal cross-linking agent (step 1);

[0026] Mixing of the base resin with inorganic fillers and epoxy-based surface crosslinkers, where the base resin is first dry blended with the inorganic fillers and subsequently surface-crosslinked by dissolving the epoxy-based surface crosslinkers in water Epoxy-based surface crosslinker mixing in solution (step 2); and

[0027] Surface modification of the base resin (step 3) by raising the temperature of the mixture of step 2,

[0028] Wherein the epoxy compound-based surface crosslinking agent comprises a first epoxy compound crosslinking agent having an epoxy equivalent of 100 g / eq or greater to less than 130 g / eq and a second epoxy compound ha...

Embodiment 1

[0126] (1) Preparation of base resin

[0127] 518 g of acrylic acid, 3.2 g of polyethylene glycol diacrylate (polyethylene glycol (400) diacrylate) and 0.04 g of diphenyl(2,4,6-trimethylbenzoyl)-phosphine oxide were added to Place in a 3 L glass vessel equipped with a stirrer, nitrogen feeder and thermometer and dissolve. 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. 500 g of this aqueous solution was fed into a stainless steel container with a width of 250 mm, a length of 250 mm and a height of 30 mm, and was irradiated by UV (exposure dose: 10 mV / cm 2 ) was subjected to UV polymerization for 90 seconds to obtain an aqueous gel polymer. The aqueous gel polymer thus obtained was pulverized to a size of 2 mm*2 mm, spread on a stainless steel wire mesh with a hole s...

Embodiment 2

[0131] A superabsorbent polymer powder was obtained in the same manner as in Example 1, except that in step (2), glycerol polyglycidyl ether was used in an amount of 0.005 parts by weight relative to 100 parts by weight of the base resin.

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Abstract

Provided are a superabsorbent polymer and a preparation method thereof. The method of preparing the superabsorbent polymer of the present invention may provide a superabsorbent polymer having improvedrewetting property and liquid permeability.

Description

technical field [0001] CROSS-REFERENCE TO RELATED APPLICATIONS [0002] This application is based on Korean Patent Application Nos. 10-2018-0139103 and 10-2019-0113734 filed on November 13, 2018 and September 16, 2019 Priority claims to Korean Patent Applications No. 10-2018-0139103 and No. 10-2019-0113734 filed on September 16, 2019, the disclosures of which are incorporated herein by reference in their entirety. [0003] The present invention relates to superabsorbent polymers and methods for their preparation. More particularly, the present invention relates to superabsorbent polymers having improved rewet characteristics and liquid permeability and methods for their preparation. Background technique [0004] Superabsorbent Polymer (SAP) is a synthetic polymer material capable of absorbing 500 to 1000 times its own weight in water. Various manufacturers name it by different names, such as SAM (SuperAbsorbency Material, super absorbent material), AGM (Absorbent Gel Mat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/24C08F2/44C08K5/1515C08K5/098C08K5/10C08K3/12C08K3/013
CPCC08J3/24C08K3/013C08K3/36C08J3/075C08J3/245C08J2333/02C08J2333/08C08J2333/10C08F2/50C08L33/02C08J3/246C08F2/44C08K5/1515C08K5/098C08K5/10C08J2300/14C08K3/12C08F2810/20A61L15/24A61L15/60B01J20/0281B01J20/103B01J20/267B01J20/3021B01J2220/46B01J2220/68C08F220/06C08J3/12
Inventor 许荣宰南大祐朴宝熙金秀珍
Owner LG CHEM LTD
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