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Method for preparing superabsorbent polymer

A superabsorbent, polymer technology, applied in the field of superabsorbent polymer preparation, can solve the problems of deterioration of working environment, increase of process load, etc.

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

AI Technical Summary

Problems solved by technology

Fine powder not only deteriorates the working environment, but also has a problem of increased process load due to the recycling process of fine powder

Method used

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  • Method for preparing superabsorbent polymer
  • Method for preparing superabsorbent polymer
  • Method for preparing superabsorbent polymer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-1

[0123] (step 1)

[0124] 609.8 g of NaOH (31.5% by weight) and 229.1 g of water were put into a double-jacketed glass reactor, and cooled to 20° C. while stirring with a magnetic stirrer to prepare solution A. 0.3 g of PEGDA solution (polyethylene glycol diacrylate, weight average molecular weight = 400, 2% by weight in AA (acrylic acid)), 18.8 g of phenylbis(2,4,6-trimethyl A solution of benzoyl)phosphine oxide (0.21% by weight in AA) and 474.9 g of AA (acrylic acid) were placed in a double-jacketed neutralization tank equipped with a forced vortex impeller and stirred at 300 rpm to prepare solution B. Solution A was mixed while filling solution A into the neutralization tank containing solution B using a pump. While circulating the refrigerant cooled to 20°C by the cooling circulator through the outer jacket of the double-jacketed reactor, the temperature of the neutralized solution raised to about 65°C due to the heat generated when AA and NaOH are neutralized Cool to 50°...

Embodiment 1-2

[0130] Prepared in the same manner as in Example 1-1, but in step 1 of Example 1-1, 4.9 g of EGDE solution (in H 2 10% by weight in O) and 24.7g SPS (sodium persulfate) solution (in H 2 4% by weight in O), and in step 2 of Example 1-1, the obtained chips were dried by hot air at 115° C. for 39 minutes, thereby preparing granules.

Embodiment 1-3

[0132] Prepare in the same manner as in Example 1-1, but in step 1 of Example 1-1, use 4.0 g of EGDE solution (in H 2 10% by weight in O) and 30.9g SPS (sodium persulfate) solution (in H 2 4% by weight in O), and in step 2 of Example 1-1, the obtained chips were dried by hot air at 100° C. for 39 minutes, thereby preparing granules.

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Abstract

The present invention relates to a method for preparing a superabsorbent polymer, the method comprising a step of drying a hydrogel polymer to a water content of 2-10 wt% and using an internal cross-linking agent in an amount of 800-2,000 ppmw on the basis of the weight of a water-soluble ethylenically unsaturated monomer, in order to reduce the generation of fine powder while maintaining the excellent physical properties of the superabsorbent polymer.

Description

technical field [0001] Cross References to Related Applications [0002] This application claims Korean Patent Application No. 10-2018-0139106 filed with the Korean Intellectual Property Office on November 13, 2018, Korean Patent Application No. 10-2018-0153909 filed with the Korean Intellectual Property Office on December 3, 2018 , and Korean Patent Application No. 10-2018-0164466 filed with the Korean Intellectual Property Office on December 18, 2018, the disclosure of which is incorporated herein by reference in its entirety. [0003] The present disclosure relates to methods for preparing superabsorbent polymers that reduce the generation of fines. Background technique [0004] 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 give it different names, such as SAM (Super Absorbency Material, super absorbent material), AGM (Absorbent Gel Material, abso...

Claims

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Application Information

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IPC IPC(8): C08J9/14C08J3/12C08J3/24C08K9/10C08F2/44C08J9/16
CPCC08J3/12C08J3/24C08J2201/026C08J2205/022C08J9/32C08J2203/22C08J2333/02C08J2207/12C08J3/075C08J3/245C08F220/02C08F222/102B01J20/261B01J20/267B01J2220/68C08F2/48C08F120/06C08J9/14C08J9/16C08J2203/14C08K9/10C08K2201/003
Inventor 金载栗宋宗勋金琪哲闵允栽金起贤李琗俄郑仁溶禹熙昶
Owner LG CHEM LTD
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