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Superabsorbent polymer particles and preparation method thereof

A polymer particle, superabsorbent technology, used in absorbent pads, bandages, medical science, etc., can solve the problems of low aggregation strength and gel strength, and achieve the effect of high gel strength

Active Publication Date: 2021-12-07
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, reassembled polymers may easily refracture into fine powders due to their low aggregate and gel strengths

Method used

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  • Superabsorbent polymer particles and preparation method thereof
  • Superabsorbent polymer particles and preparation method thereof
  • Superabsorbent polymer particles and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example

[0102] 100g of acrylic acid, 0.5g of polyethylene glycol diacrylate (Mw=523) as a crosslinking agent, 0.2g of sodium persulfate as a thermal initiator, 0.008g of phenylbis(2,4, 6-Trimethylbenzoyl)phosphine oxide, 40 g of NaOH, and 127 g of water were mixed to prepare an aqueous solution of a monomer composition having a monomer concentration of 45.8% by weight.

[0103] The aqueous monomer composition solution was introduced into a feeder of a polymerization reactor equipped with a continuous conveyor belt. Then, while keeping the temperature of the polymerization atmosphere at 80° C., ultraviolet rays (irradiation amount: 15 mW / cm 2 ) to irradiate the composition, and perform UV polymerization for 2 minutes to prepare a hydrogel polymer.

[0104] Transfer the hydrogel polymer to a meat grinder and cut into 0.1 cm to 0.2 cm. At this time, the water content of the cut hydrogel polymer was 47% by weight.

[0105]Then, the hydrogel polymer was dried for 30 minutes in a hot air...

Embodiment

[0109] 1800 g of the first fine powder and 200 g of the second fine powder separated in the above preparation example were placed in a 40 L planetary mixer (PM-040, DNTEK Co., Ltd.), measured and introduced thereinto as shown in Table 1 below. out of the silica. Aerosil 200 is fumed silica from Evonik Degussa, DM-30S is silica from Tokuyama Corporation, and SnowTex O is colloidal silica from Nissan Chemical. Then, after closing the lid of the mixer, the start button of the mixer was pressed, the rpm of the impeller was set to 60, and the rpm was set back to 0 after 60 seconds. Then, water heated to 80°C was added to the mixer. After 60 seconds from addition, press the stop button to end mixing. Then, the fine powder granules were taken out from the mixer, placed in a tray made of stainless steel mesh on the bottom and sides, and then dried in a convection oven at 180° C. for 3 hours. Thereafter, 250 g of the dried granules were put into a bell mixer (HMF-3260S) manufactured...

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Abstract

The present disclosure relates to a method for producing superabsorbent polymer granules and superabsorbent polymer granules produced according to the method. More specifically, the production method of the present disclosure includes the steps of: forming a hydrogel polymer by performing thermal polymerization or photopolymerization of a monomer composition comprising a water-soluble ethylenically unsaturated monomer and a polymerization initiator; drying and pulverizing the hydrogel polymer; classifying the pulverized polymer into a first fine powder having a particle diameter of 150 μm or less and a base resin having a particle diameter of 150 μm or more and 850 μm or less; linking; classifying the surface-crosslinked base resin to separate a second fine powder having a particle diameter of 150 μm or less; and forming a fine powder by mixing the first fine powder, the second fine powder, and silica in a wet state Granules.

Description

technical field [0001] Cross References to Related Applications [0002] This application claims the benefit of Korean Patent Application No. 10-2015-0143415 filed with the Korean Intellectual Property Office on October 14, 2015, the disclosure of which is incorporated herein by reference in its entirety. [0003] The present disclosure relates to superabsorbent polymer granules having high fine powder aggregate strength and gel strength and methods for their preparation. Background technique [0004] Super absorbent polymer (SAP) is a synthetic polymer material capable of absorbing 500 to 1000 times its own weight in water. Each manufacturer names it differently, for example, SAM (SuperAbsorbency Material, super absorbent material), AGM (Absorbent Gel Material, absorbent gel material) and the like. Such superabsorbent polymers have begun to be practically used in hygiene products, and are now widely used not only in hygiene products (such as disposable diapers for childre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J3/12C08J3/24C08J3/075
CPCC08J3/12C08J3/24A61L15/60C08J3/075C08J2357/10C08K3/36C08K2201/005
Inventor 南大祐李京懋李在宖韩章善
Owner LG CHEM LTD