Crylic acid water-absorbent resin with excellent water-retaining property and yellowing resistance and preparation method thereof

A technology of water-absorbent resin and acrylic acid, which is applied in the field of acrylic water-absorbent resin and its preparation, which can solve the problems of reduced liquid absorption rate and limited water retention degree of the product, and achieve the effects of low internal cross-linking density, increased water retention and high cross-linking density

Active Publication Date: 2013-12-18
WANHUA CHEM GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the above method, there is a problem that the obtained water-absorbent resin is colored (turned yellow) due to oxidation of methoxyphenol and furfural contained in the monomer
Therefore, these conventional methods can only improve the degree of water retention to a limited extent, and will cause a significant reduction in the liquid absorption rate of the product.

Method used

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  • Crylic acid water-absorbent resin with excellent water-retaining property and yellowing resistance and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] a) The commercially available industrial-grade high-purity acrylic acid is recorded as acrylic acid monomer (1) 2700g and deionized water 800g into a 10L reactor with a stirrer and a jacket cooling device, then under stirring and cooling conditions, the 2400 g of 32% by weight sodium hydroxide solution was slowly added into the reaction kettle for neutralization reaction to obtain the first acrylic acid monomer solution, and the temperature during the reaction did not exceed 40°C.

[0039] b) Feed the first acrylic acid monomer solution obtained in a) into a jacketed double-arm kneader with a volume of 10 L and two sigma-type paddles. While keeping the reaction liquid at 10°C, use nitrogen gas to Displace the air in the system. Then, while stirring the reaction solution, 0.54 g of N,N-methylenebisacrylamide, 8.1 g of potassium persulfate and 8.1 g of sodium bisulfite were added. Polymerization started quickly at 10°C, the reaction temperature was raised to 110°C, and t...

Embodiment 2

[0046] a) The commercially available industrial-grade high-purity acrylic acid is recorded as acrylic acid monomer (1) 2700g and deionized water 800g into a 10L reactor with a stirrer and a jacket cooling device, then under stirring and cooling conditions, the 2400 g of 32% by weight sodium hydroxide solution was slowly added into the reaction kettle for neutralization reaction to obtain the first acrylic acid monomer solution, and the temperature during the reaction did not exceed 40°C.

[0047] b) Feed the first acrylic acid monomer solution obtained in a) into a jacketed double-arm kneader with a volume of 10 L and two sigma-type paddles. While keeping the reaction liquid at 10°C, use nitrogen gas to Displace the air in the system. Then, while stirring the reaction solution, 0.54 g of N,N-methylenebisacrylamide, 8.1 g of potassium persulfate and 8.1 g of sodium bisulfite were added. Polymerization started quickly at 10°C, the reaction temperature was raised to 110°C, and t...

Embodiment 3

[0054] a) The commercially available industrial-grade high-purity acrylic acid is recorded as acrylic acid monomer (1) 2700g and deionized water 800g into a 10L reactor with a stirrer and a jacket cooling device, then under stirring and cooling conditions, the 2400 g of 32% by weight sodium hydroxide solution was slowly added into the reaction kettle for neutralization reaction to obtain the first acrylic acid monomer solution, and the temperature during the reaction did not exceed 40°C.

[0055] b) Feed the first acrylic acid monomer solution obtained in a) into a jacketed double-arm kneader with a volume of 10 L and two sigma-type paddles. While keeping the reaction liquid at 10°C, use nitrogen gas to Displace the air in the system. Then, while stirring the reaction solution, 0.54 g of N,N-methylenebisacrylamide, 8.1 g of potassium persulfate and 8.1 g of sodium bisulfite were added. Polymerization started quickly at 10°C, the reaction temperature was raised to 110°C, and t...

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Abstract

The invention discloses crylic acid water-absorbent resin with an excellent water-retaining property and yellowing resistance and a preparation method thereof. The water-absorbent resin is prepared by using raw materials including an acrylic monomer solution and a comonomer which is 0-50wt% of quantity of crylic acid used by a core, the water-absorbent resin is of a core-shell structure, and a shell contains 10-1000ppm of anti-yellowing polymerization inhibitor by weight of the crylic acid in the shell. The preparation method is that the comonomer, a cross-linking agent and an initiator are added in the acrylic monomer solution to conduct polymerization reaction; a hydrogel polymer obtained by the reaction is smashed, dried, grinded and sieved to obtain the core of the water-absorbent resin; a mixed solution of the crylic acid, the cross-linking agent and the initiator containing the anti-yellowing polymerization inhibitor is evenly mixed, and heat treatment is carried out on the surface of the core to obtain a product; and a surface crosslinking solution is evenly sprayed on an initial product, and high temperature crosslinking is carried out to obtain the product of water-absorbent resin. The product has the advantages of excellent water-retaining property and yellowing resistance.

Description

technical field [0001] The invention relates to an acrylic water-absorbing resin and a preparation method thereof, in particular to an acrylic water-absorbing resin with excellent water retention and yellowing resistance and a preparation method thereof. Background technique [0002] Superabsorbent resin is a polymer material with three-dimensional spatial structure and strong water absorption performance. Polyacrylic acid-based superabsorbent resin has a series of advantages such as strong water absorption capacity, low production cost, simple process, and high production efficiency, and has become the main type of superabsorbent resin at present. [0003] Superabsorbent resin can absorb a hundred times or even a thousand times its own water, and it will not lose water when squeezed after absorbing water, so it is widely used in many fields such as personal hygiene products, such as women's sanitary napkins, baby diapers, elderly incontinence diapers, etc. . And additiona...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J3/24C08L33/02C08F265/02C08F220/56C08F220/28C08F2/40C08F4/40
Inventor 李春王俊宇韩洋张春代春丽范海南柯长颢华卫琦
Owner WANHUA CHEM GRP CO LTD
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