Method for synthesizing resin with high water absorption from polyaminoester

A technology of superabsorbent resin and polyurethane, which is applied in the field of polyurethane synthesis of superabsorbent resin, can solve the problems of occupation and large land, and achieve the effects of stable and safe reaction, fast polymerization speed and high molecular weight

Inactive Publication Date: 2006-04-19
NANJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The simplest and direct way to deal with these wastes is to bury them, but the burial method takes up a lot of land, so the burial method has been strongly opposed by people

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Raw material ratio (all dosages are WT%):

[0043] AA dosage 83.8%

[0044] AA neutralization is 90%

[0045] PU consumption 10.3%

[0046] Span-60 dosage 3%

[0047] Dosage of hydrogen peroxide 1.25%

[0048] Sodium bisulfite dosage 1.25%

[0049] The amount of epichlorohydrin is 0.4%.

[0050] At 70-100°C, the polyurethane (PU) is dissolved in an appropriate amount of a mixed solvent of dimethyl sulfoxide (DMSO) and sodium hydroxide, and the acrylic acid (AA) is neutralized with a sodium hydroxide solution to a neutralization degree of 90%. Mix the above two solutions and transfer them to the reactor, add span-60, epichlorohydrin, hydrogen peroxide and sodium bisulfite, and after high-speed shear emulsification for 30min, react at a constant temperature of 60-80°C under a nitrogen atmosphere About 3 hours, drying at 110-130 ℃ to obtain super absorbent resin. The water absorption rate of the product was determined to be 205g·g -1 .

Embodiment 2

[0052] Raw material ratio (all dosages are WT%):

[0053] AA dosage 82.9%

[0054] AA neutralization is 80%

[0055] PU usage 11.9%

[0056] Span-60 dosage 3%

[0057] Dosage of hydrogen peroxide 1.33%

[0058] Sodium bisulfite dosage 0.67%

[0059] The dosage of glycerin is 0.2%.

[0060]At 70-100°C, the polyurethane (PU) is dissolved in an appropriate amount of mixed solvent of dimethyl sulfoxide (DMSO) and sodium hydroxide, and the acrylic acid (AA) is neutralized with a sodium hydroxide solution to a neutralization degree of 80%. Mix the above two solutions and transfer them to the reactor, add span-60, glycerin, hydrogen peroxide and sodium bisulfite, and emulsification at high speed for 30min, then react at a constant temperature of 60~80℃ for about 3h under nitrogen atmosphere, Dry at 110-130°C to obtain super absorbent resin. The water absorption rate of the product was determined to be 220g·g -1 .

Embodiment 3

[0062] Raw material ratio (all dosages are WT%):

[0063] AA dosage 82.9%

[0064] AA neutralization is 90%

[0065] PU usage 11.9%

[0066] Span-60 dosage 3%

[0067] Dosage of hydrogen peroxide 1.33%

[0068] Sodium bisulfite dosage 0.67%

[0069] The amount of epichlorohydrin is 0.2%.

[0070] At 70-100°C, the polyurethane (PU) is dissolved in an appropriate amount of a mixed solvent of dimethyl sulfoxide (DMSO) and sodium hydroxide, and the acrylic acid (AA) is neutralized with a sodium hydroxide solution to a neutralization degree of 90%. Mix the above two solutions and transfer them to the reactor, add span-60, epichlorohydrin, hydrogen peroxide and sodium bisulfite, and after high-speed shear emulsification for 30min, react at a constant temperature of 60-80°C under a nitrogen atmosphere About 3 hours, drying at 110-130 ℃ to obtain super absorbent resin. The water absorption rate of the product was determined to be 250g·g -1 .

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Abstract

A process for preparing high-hydroscopicity resin from polyurethane includes such steps as dissolving polyurethane in solvent mixture, using alkali solution to neutralize acrylic acid, mixing them together, adding disperser, trigger and cross-linking agent, and high-speed shearing while reaction in protective atmosphere.

Description

technical field [0001] The invention relates to a method for synthesizing superabsorbent resin by utilizing waste polyurethane sponge. Background technique [0002] The development of superabsorbent resins began in the 1960s. After more than 40 years of development and research, its theoretical basis and application technology have been greatly developed. my country started relatively late. In 1982, the superabsorbent resin was synthesized for the first time, and the first patent was obtained in 1988. There are many types of super absorbent resins. According to the source, there are three main categories: starch based, cellulose based and synthetic resin based. These series of products have good performance, but the raw materials used are regular chemical raw materials, and the cost is high. At present, there are not many technologies for synthesizing superabsorbent resins from waste resources in China. After inquiries on China Journal Network, Wanfang Database, VIP Data...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/00
Inventor 李利刘平生沈健周宁琳魏少华章峻
Owner NANJING NORMAL UNIVERSITY
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