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Super absorbent polymer

A superabsorbent, polymer technology, used in absorbent pads, medical science, bandages, etc., that solves the problems of not properly proposing to reliably measure gel strength, unsuccessfully developing absorption and retention capabilities, etc.

Inactive Publication Date: 2017-02-22
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Previously, however, methods to reliably measure gel strength in the appropriate direction, which is directly related to liquid permeability, have not been properly proposed and have not been successfully developed to maintain appropriate levels of absorbency and absorbency and retention under pressure, and superabsorbent polymers of excellent strength corresponding to excellent liquid permeability
[0008] For these reasons, superabsorbent polymers excellently exhibiting all the physical properties of the three aspects have not yet been fully developed, and therefore it is desired to continue research to improve the physical properties of superabsorbent polymers

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0162] An aqueous monomer solution with a monomer concentration of 45 wt% was prepared by mixing 100 g of acrylic acid, 0.5 g of polyethylene glycol diacrylate (Mw=523) as a crosslinking agent, 83.3 g of 50% caustic soda (NaOH) and 89.8 g of water .

[0163] Subsequently, 810 g of aqueous monomer solution was mixed with 30.54 g of 0.18% ascorbic acid solution and 33 g of 1% sodium persulfate solution, and the mixture and 30.45 g of 0.15% hydrogen peroxide solution were fed through the feed section of a continuous polymerization reactor with a kneader, to aggregate. At this time, the temperature of the polymerization apparatus was maintained at 80°C, the maximum polymerization temperature was 110°C, and the polymerization time was 1 minute and 15 seconds. After that, kneading was continuously performed, and polymerization and kneading were performed for 20 minutes. Thus, the resulting polymer is dispersed to have a size of 0.2 cm or less. At this time, the water content of t...

Embodiment 2 to 6

[0167] The superabsorbent polymers of Examples 2 to 6 were obtained in the same manner as in Example 1, except that during the surface crosslinking reaction, the surface crosslinking reaction conditions were changed as shown in Table 1 below, such as the reaction The initial temperature of the matrix polymer during the start-up, the maximum reaction temperature, the time for the temperature to rise from the initial temperature to the maximum reaction temperature, and the hold time at the maximum reaction temperature.

Embodiment 7

[0179] An aqueous monomer solution having a monomer concentration of 45% by weight was prepared by mixing 100 g of acrylic acid, 0.5 g of polyethylene glycol diacrylate (Mw=523) as a crosslinker, 83.3 g of 50% caustic soda (NaOH) and 89.8 g of water .

[0180] Subsequently, 810 g of monomer aqueous solution was mixed with 30.54 g of 0.18% ascorbic acid solution and 33 g of 1% sodium persulfate solution, and the mixture was fed through the feed section of the continuous polymerization reactor with a kneader and 30.45 g of 0.15% hydrogen peroxide solution, thereby performing aggregation. At this time, the temperature of the polymerization reactor was maintained at 80°C, the maximum polymerization temperature was 110°C, and the polymerization time was 1 minute and 15 seconds. Thereafter, kneading was continuously performed, and polymerization and kneading were performed for 20 minutes. Thus, the resulting polymer is dispersed to have a size of 0.2 cm or less. At this time, the...

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PUM

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Abstract

The present invention relates to a super absorbent polymer which generally exhibits balanced and superior physical properties through the optimization of retention capacity, absorption under pressure, liquid permeability, and gel strength. This super absorbent resin comprises a cross-linked polymer obtained by surface cross-linking a powder type base resin prepared by polymerizing water-soluble ethylene-based unsaturated monomers having an acidic group of which at least a portion is neutralized, and the centrifuge retention capacity (CRC), absorption under pressure (AUP), gel strength (G'), and saline flow conductivity (SFC), of the super absorbent resin can satisfy predetermined relational expressions.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS [0002] This application claims Korean Patent Application No. 10-2014-0071547 filed on June 12, 2014, Korean Patent Application No. 10-2014-0177736 filed on December 10, 2014 and filed in 2015 Korean Patent Application No. 10-2015-0082881 filed on June 11, 2015, the entire contents of which are incorporated herein by reference. technical field [0003] The present invention relates to superabsorbent polymers which exhibit overall well-balanced and excellent physical properties through optimization of centrifuge retention capacity, absorbency under pressure, liquid permeability and gel strength. Background technique [0004] Super Absorbent Polymer (Super Absorbent 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 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): C08F20/10C08J3/075C08J3/24
CPCC08J3/075C08J3/245C08F220/06C08J2333/02C08F2/10C08F222/385A61L15/60B01J20/267B01J2220/68C08F222/102A61L15/24C08L101/14
Inventor 李惠民朴城贤李明汉林艺勋金想恩
Owner LG CHEM LTD
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