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Super-absorbent polymer and preparation method therefor

A superabsorbent, polymer technology, applied in the direction of absorbent pads, medical science, bandages, etc., can solve the problem of insufficient improvement of diffusion characteristics

Active Publication Date: 2019-07-16
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% by weight aqueous sodium hydroxide solution was added, and nitrogen gas was continuously added to prepare a water-soluble unsaturated monomer aqueous 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 was performed with a standard sieve according to ASTM standards to prepare a base polymer powder having a particle diameter 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...

Embodiment 2

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

[0111] When preparing the surface crosslinking 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) was mixed with 4 parts by weight of water 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 group of the surface crosslinking agent in a mixed state by its weight average was calculated The subparameter is 15.86. For reference, the solubility parameter is a value in which the weight average is measured only for a mixture of glycerol carbonate and propylene carbonate other than water in the surface crosslinking soluti...

Embodiment 3

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

[0115] When preparing the surface crosslinking 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 bond component parameter: 12.3) was mixed with 4 parts by weight of water 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 group of the surface crosslinking agent in a mixed state by calculating from its weight average was calculated The subparameter is 15.6. For reference, the solubility parameter is a value in which the weight average is measured only for a mixture of glycerol carbonate and ethylene carbonate other than water in the surface crosslinking...

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Abstract

The present invention relates to a super absorbent polymer which not only has excellent basic absorption performance but also can improve rewet characteristics and leakage suppression characteristicsof hygienic materials such as diapers, and a method for preparing the same. The super absorbent polymer includes: a base polymer powder including a first cross-linked polymer of a water-soluble ethylenically unsaturated monomer having an acidic group of which at least a part is neutralized; and a surface crosslinked layer that is formed on the base polymer powder and includes a second cross-linkedpolymer in which the first crosslinked polymer is further crosslinked via a surface crosslinking agent, wherein the surface crosslinking agent includes a mixture of plural kinds of cyclic alkylene carbonates, and where the mixture has a Hansen solubility parameter by hydrogen bonding component of 13 or more.

Description

technical field [0001] Cross References 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 performance but also can improve rewetting characteristics and leakage suppression characteristics of hygienic 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 (Super Absorbent Material ) or AGM (absorbent gel material), etc. Such superabsorbent polymers began to be practically used in sanitary products, and are currently wi...

Claims

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Application Information

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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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