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Method for preparing superabsorbent resin, and superabsorbent resin

A superabsorbent and polymer technology, applied in the field of superabsorbent polymers, can solve the problems of deterioration of physical properties, reduce the degree of polymerization of superabsorbent polymers, etc., and achieve improved absorption rate, excellent dispersion stability and compatibility Effect

Active Publication Date: 2018-12-21
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, when conventional additives as described above are used, there is a limit in improving the effect due to the addition thereof, that is, simultaneously increasing the basic absorption capacity and the absorbency under pressure
On the contrary, such additives reduce the degree of polymerization of the superabsorbent polymer and become a factor leading to deterioration of its physical properties

Method used

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  • Method for preparing superabsorbent resin, and superabsorbent resin
  • Method for preparing superabsorbent resin, and superabsorbent resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0131] Example 1: Preparation of superabsorbent polymer

[0132] Use 3M TM Glass hollow particles iM30K (particle size: 15.3 μm (D50), density: 0.6 g / cc).

[0133] 537.45g of acrylic acid, 0.32g of glass hollow particles (based on 100 parts by weight of monomer, 0.06 parts by weight), 0.86g of polyethylene glycol diacrylate (Mw=598) as a crosslinking agent, 653.17g of 30% caustic soda (NaOH ), 0.04 g of diphenyl (2,4,6-trimethylbenzoyl)-phosphine oxide as a UV initiator, 1.07 g of sodium persulfate and 206.41 g of water were mixed to prepare an acrylic acid monomer concentration of 36.7% by weight (Neutralization degree of acrylic acid: 70 mol%).

[0134] Subsequently, the monomer composition was stirred at 300 rpm for 25 seconds and foamed.

[0135] Then, the monomer composition is fed to a continuously moving conveyor belt reactor through a feeder, and then is irradiated with UV rays (irradiation dose: 2mW / cm2) by a UV irradiation device. 2 ) for 2 minutes to perform U...

Embodiment 2

[0140] Example 2: Manufacture of superabsorbent polymer

[0141] Use 3M TM Glass hollow particles iM30K (particle size: 15.3 μm (based on D50), density: 0.6 g / cc).

[0142]A superabsorbent resin having a particle size of 150 μm to 850 μm of Example 2 was produced in the same manner as in Example 1 except that 0.8 g of glass hollow particles (0.15 parts by weight based on 100 parts by weight of the monomer) was used.

Embodiment 3

[0143] Example 3: Manufacture of superabsorbent polymer

[0144] Use 3M TM Glass hollow particles iM30K (particle size: 15.3 μm (based on D50), density: 0.6 g / cc).

[0145] A superabsorbent resin having a particle size of 150 μm to 850 μm in Example 3 was produced in the same manner as in Example 1, except that 2.68 g of glass hollow particles (0.5 parts by weight based on 100 parts by weight of the monomer) were used and The foaming time was changed to 22 seconds.

[0146] An electron micrograph of the superabsorbent resin produced in Example 3 is shown in figure 1 , it was confirmed that the hollow glass particles were uniformly dispersed in the base resin powder.

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Abstract

The present invention provides a superabsorbent resin and a method for preparing same, the superabsorbent resin having a controlled internal cross-link density and thereby having simultaneously improved basic absorbency and absorbency under pressure. The superabsorbent resin may comprise: a base resin powder comprising a cross-linked polymer of a monomer comprising a water-soluble ethylene-based unsaturated compound or a salt thereof; and a cross-linked surface layer which is formed on the base resin powder, and in which the cross-linked polymer is additionally cross-linked, wherein a hollow glass particle having a micron-scale particle size is included in the cross-linked structure of the cross-linked polymer of the base resin powder.

Description

technical field [0001] Cross References to Related Applications [0002] This application claims priority and benefit from Korean Patent Application No. 10-2016-0080128 filed with the Korean Intellectual Property Office on June 27, 2016, the disclosure of which is incorporated herein by reference in its entirety. [0003] The present invention relates to superabsorbent polymers having a controlled degree of internal crosslinking and thus simultaneously improved basic absorbent capacity and absorbency under pressure and a method for producing the same. Background technique [0004] Super Absorbent Polymer (SAP) is a synthetic polymer material capable of absorbing about 500 to about 1,000 times its own weight of water, and various manufacturers name it differently, such as SAM (Super Absorbency Material , superabsorbent material), AGM (Absorbent Gel Material, absorbent gel material), etc. Such superabsorbent polymers began to be practically used in sanitary products, and ar...

Claims

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Application Information

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IPC IPC(8): C08J3/24C08J3/12C08J3/075C08K7/28C08K3/40C08F20/06C08L33/02
CPCC08F20/06C08J3/075C08J3/12C08J3/24C08K3/40C08K7/28C08L33/02C08J2333/02C08J2333/18B01J20/10B01J20/267B01J20/28004B01J20/28011B01J20/28021B01J20/28026B01J20/28047B01J20/3021B01J20/3085C08J3/245C08J2300/14C08K2201/005
Inventor 尹基烈朱孝叔金琪哲崔贤金柱圻
Owner LG CHEM LTD
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