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Superabsorbent polymer and method of making the same

A superabsorbent, polymer technology, applied in the direction of absorbent pads, bandages, medical science, etc., can solve the problem of insufficient improvement of diffusion characteristics, achieve the effect of improving leakage suppression characteristics and improving rewetting characteristics

Active Publication Date: 2022-07-05
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, the improvement of the diffusion characteristics due to the design change of the hygienic material itself is not sufficient, so its further improvement is continuously demanded

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0106] 500 g of acrylic acid and 3 g of polyethylene glycol diacrylate (Mw=523) were added and mixed. Then, 0.01 g of diphenyl(2,4,6-trimethylbenzoyl)-phosphine oxide was added and dissolved. Then, 896.4 g of a 24.5 wt % aqueous sodium hydroxide solution was added, and nitrogen gas was continuously added to prepare an aqueous water-soluble unsaturated monomer solution. Then, the temperature of the aqueous solution was cooled to 50°C, and the aqueous solution was irradiated with ultraviolet rays for 90 seconds to obtain a hydrogel-like polymer. The obtained hydrogel polymer was pulverized using a pulverizing device. Classification is carried out with a standard screen according to the ASTM standard to prepare a base polymer powder having a particle size of 150 to 850 μm.

[0107] Subsequently, with respect to 100 parts by weight of the prepared base polymer powder, 1 part by weight of glycerol carbonate (Hansen solubility hydrogen bond component parameter: 18.9), 1 part by we...

Embodiment 2

[0110] A base polymer powder was prepared in the same manner as in Example 1.

[0111] When preparing the surface cross-linking solution, with respect to 100 parts by weight of the base polymer powder, 1.5 parts by weight of glycerol carbonate (Hansen solubility hydrogen bond component parameter: 18.9), 0.9 parts by weight of propylene carbonate ( Hansen solubility hydrogen bond component parameter: 10.8) and 4 parts by weight of water were mixed to prepare a surface crosslinking solution. In this surface crosslinking solution, based on the respective solubility parameters of glycerol carbonate and propylene carbonate, the Hansen solubility hydrogen bond set by the surface crosslinking agent in a mixed state calculated from the weight average value thereof was calculated The sub-parameter is 15.86. For reference, the solubility parameter is a value obtained by measuring the weight average value only for the mixture of glycerol carbonate and propylene carbonate other than wate...

Embodiment 3

[0114] A base polymer powder was prepared in the same manner as in Example 1.

[0115] When preparing the surface cross-linking solution, with respect to 100 parts by weight of the base polymer powder, 1 part by weight of glycerol carbonate (Hansen solubility hydrogen bond component parameter: 18.9), 1 part by weight of ethylene carbonate ( Hansen Solubility Hydrogen Bonding Component Parameters: 12.3) and 4 parts by weight of water were mixed to prepare a surface crosslinking solution. In this surface crosslinking solution, based on the respective solubility parameters of glycerol carbonate and ethylene carbonate, the Hansen solubility hydrogen bond set by the surface crosslinking agent in a mixed state calculated from the weight average value thereof was calculated The sub-parameter is 15.6. For reference, the solubility parameter is a value obtained by measuring the weight average value only for the mixture of glycerol carbonate and ethylene carbonate excluding water in th...

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PUM

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Abstract

The present invention relates to a superabsorbent polymer, which not only has excellent basic absorption properties, but also can improve the rewetting properties and leakage inhibiting properties of sanitary materials such as diapers, and a preparation method thereof. The superabsorbent polymer includes: a base polymer powder including a first cross-linked polymer of a water-soluble ethylenically unsaturated monomer having at least partially neutralized acidic groups; and a surface cross-linked layer a second cross-linked polymer formed on the base polymer powder and comprising a surface cross-linking agent that further cross-links the first cross-linked polymer, wherein the surface cross-linking agent comprises a plurality of cyclic A mixture of alkylene carbonates, and wherein the Hansen solubility hydrogen bond component parameter of the mixture is 13 or more.

Description

technical field [0001] CROSS-REFERENCE TO RELATED APPLICATIONS [0002] This application is based on, and claims priority from, Korean Patent Application No. 10-2017-0147584 filed with the Korean Intellectual Property Office on November 7, 2017, the entire contents of which are incorporated herein by reference. [0003] The present invention relates to a superabsorbent polymer which not only has excellent basic absorption properties, but also can improve the rewetting properties and leakage inhibiting properties of sanitary materials such as diapers, and a preparation method thereof. Background technique [0004] Superabsorbent polymer (SAP) is a synthetic polymer material capable of absorbing about 500 to about 1,000 times its own weight in water, and each manufacturer names it differently, such as SAM (Superabsorbent Material) ) or AGM (Absorptive Gel Material) etc. This superabsorbent polymer began to be practically used in sanitary products, and is currently widely use...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J3/24C08K5/109C08K5/103C08K5/06C08J3/12
CPCC08J3/12C08J3/24C08J3/245C08J3/075C08F6/008C08F2/10C08F220/06C08J2333/02C08J2333/08C08J2333/10A61L15/60C08C19/24C08F222/102C08K5/109C08K5/103C08K5/06C08J2207/12A61L15/24
Inventor 孙精敏李水珍
Owner LG CHEM LTD
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