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Method for producing super absorbent polymer, and super absorbent polymer

A superabsorbent, polymer technology, applied in the field of superabsorbent polymer and its preparation, can solve the problems of reduced efficiency, deterioration of physical properties of fine powder reassembly, etc.

Active Publication Date: 2020-09-11
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are problems in that the physical properties of the fine powder reassembled body are more deteriorated compared with those of the base polymer, and the complicated process reduces the efficiency

Method used

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  • Method for producing super absorbent polymer, and super absorbent polymer
  • Method for producing super absorbent polymer, and super absorbent polymer

Examples

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preparation example Construction

[0036] A method for preparing a superabsorbent polymer according to an embodiment of the present invention may include the step of performing thermal polymerization or photopolymerization of a monomer composition comprising a water-soluble ethylenically unsaturated monomer and a polymerization initiator to prepare a water-containing the gel polymer; the aqueous gel polymer is dried, pulverized and size-sorted to classify the aqueous gel polymer into fine powder with a particle size of less than 150 μm and regular particles with a particle size of 150 μm to 850 μm; one or more of the fluff pulp and the synthetic polymer fibers are mixed with the fine powder and water to prepare an aqueous fine powder solution; and the aqueous fine powder solution is agitated to prepare a fine powder reassembly.

[0037] For reference, as used herein, "polymer" means a polymerized state of a water-soluble ethylenically unsaturated monomer, and may encompass polymers in all water content ranges, p...

preparation example 1

[0116] 100g of acrylic acid, 3.0g of polyethylene glycol diacrylate (PEGDA, Mw=523) as a crosslinking agent, 0.008g of phenylbis(2,4,6-trimethylbenzoyl) as a photoinitiator Phosphine oxide, 0.08 g of sodium persulfate (SPS) as a thermal initiator, 128 g of caustic soda (NaOH) and 63.5 g of water were mixed with each other. To this mixture, each fiber in Table 1 below was added in an amount of 5 parts by weight relative to 100 parts by weight of the monomer composition to prepare a monomer composition.

[0117] Thereafter, the monomer composition was placed on a continuously moving conveyor belt and irradiated by UV (UV intensity: 2mW / cm 2 ) was UV polymerized for 2 minutes to obtain an aqueous gel polymer sheet.

[0118] The aqueous gel polymer sheet was cut into a size of 3 cm x 3 cm and minced using a meat grinder (hole size 16 mm, speed 60 Hz) to prepare crumbs. The chips are dried in an oven capable of moving the air flow up and down. Specifically, the chips were unifor...

Embodiment 1 to 9

[0121] (1) Preparation of fine powder reassembled body

[0122] Each fiber of Table 1 below was added in an amount as described in Table 1 with respect to 100 parts by weight of the fine powder having a particle size of less than 150 μm obtained in Preparation Example 1, and allowed to mix with each other for 1 minute. Then, 150 parts by weight of water was added, and further mixed for 10 seconds to prepare a fine powder reassembled body.

[0123] (2) Preparation of Superabsorbent Polymer Containing Fine Powder Reassembled Body

[0124] The hydrous gel polymer minced using a meat grinder (hole size: 16 mm) and the fine powder reassembled body in Preparation Example 1 were mixed in a weight ratio of 75:25 to obtain a coarsely pulverized hydrous gel polymer . Thereafter, the steps of drying, pulverization and size classification were performed in the same manner as in Preparation Example 1 to prepare a base polymer.

[0125] Thereafter, a surface crosslinking solution (6.2 pa...

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Abstract

The present invention relates to a super absorbent polymer, and a method for producing same. More specifically, the present invention relates to a super absorbent polymer which exhibits excellent absorption performance and an excellent absorption rate, and includes a fine powder-reassembled body; and a method for producing the super absorbent polymer.

Description

technical field [0001] Cross References to Related Applications [0002] This application is based on and claims priority from Korean Patent Applications No. 10-2018-0158920 and No. 10-2019-0152657 filed on December 11, 2018 and November 25, 2019, respectively, the disclosures of which are incorporated by reference in their entirety Incorporated into this article. [0003] The present invention relates to superabsorbent polymers and methods for their preparation. More particularly, the present invention relates to a superabsorbent polymer comprising a fine powder reassembled body, and a method for producing the same, wherein the superabsorbent polymer exhibits excellent absorption characteristics. Background technique [0004] Superabsorbent polymer (SAP) is a synthetic polymer material capable of absorbing 500 to 1000 times its own weight in water. Since such superabsorbent polymers began to be practically used in hygiene products, they are now widely used not only in h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/24C08J3/12C08L101/14C08L97/02B29B9/12
CPCB29B9/12C08J3/12C08L97/02B29B2009/125B29B9/16C08J3/245C08J3/075C08J2333/02C08J2300/14C08F2/10C08F220/06C08L33/02C08F2/50C08F222/102C08L77/00C08L23/12C08L29/04C08L101/14B01J20/261B01J20/267B01J20/28016B01J20/3021B01J2220/68B29B9/02B29B9/14C08K3/30C08K5/5397C08K7/02C08K2003/3045C08K2201/004C08L1/02C08L77/06
Inventor 崔用锡洪连祐申恩智安泰彬
Owner LG CHEM LTD
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