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Amphoteric ion high water absorption resin and its prepn

A technology of superabsorbent resin and amphoteric ion, which is applied in the field of water-absorbent resin and its preparation, can solve the problems of difficult biodegradation, unfavorable human health, and less soluble components, and achieve strong anti-mildew ability, excellent electrolyte resistance and biological Degradability and the effect of less soluble components

Inactive Publication Date: 2007-08-08
JIANGSU QIANGLIN BIO ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the residual acrylic acid in synthetic resin-based superabsorbent resins is not conducive to human health, and is not easy to be biodegraded, which is a non-environmentally friendly material; starch-based superabsorbent resins have disadvantages such as low gel strength and easy mold decomposition; Because of its high gel strength, less soluble components, and strong anti-mildew ability, it has attracted people's attention. Coupled with the wide range of cellulose sources, it has the potential to reduce costs, recycle waste, and become an environmentally friendly material. It is expected to become a highly absorbent material. New Hotspots in Resin Research and Development

Method used

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  • Amphoteric ion high water absorption resin and its prepn

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Embodiment 1

[0025] A zwitterionic superabsorbent resin and a preparation method thereof, comprising the steps of:

[0026] In the first step, the acrylic acid monomer is neutralized with an alkali solution (for example, a NaOH solution with a concentration of 0.5 mol / L, a KOH solution with a concentration of 0.5 mol / L) to a neutralization degree of 50-90%, and then water-soluble cellulose is added , acrylamide and cationic vinyl polymerized monomer form a mixed reaction system, and add water to mix to form a mixed reaction system. In the mixed system, substances other than water account for 20 to 50% of the total mass of the mixed reaction system. Based on the total mass of acrylic acid, water-soluble cellulose, acrylamide and cationic vinyl polymerized monomers, the mass percentage of acrylic acid to the total mass of acrylic acid, water-soluble cellulose, acrylamide and cationic vinyl polymerized monomers is 30-65% %, for example, can be 40%, 42%, 48%, 53%, 62%, and the mass percentage ...

Embodiment 2

[0030]Embodiment 2 A zwitterionic superabsorbent resin according to claim 1, the water absorption of the resin to distilled water is greater than 700 grams of water / gram of resin, the water absorption of tap water is greater than 400 grams of water / gram of resin, and to 0.9% chlorine The water absorption of sodium chloride tap water solution is greater than 100 grams of water / gram of resin.

Embodiment 3

[0031] Preparation and water absorption performance of embodiment 3 water-absorbent resin 1

[0032] 1. Weigh 55 grams of acrylic acid and 91 mL of 6mol / L NaOH solution, neutralize the two and cool to room temperature.

[0033] 2. Weigh 6 grams of carboxymethylcellulose, 35 grams of acrylamide, 10 grams of methacryloyloxyethyltrimethylammonium chloride, and 0.1 grams of N, N'-methylenebisacrylamide, add 175ml Distilled water, stir well to dissolve, then add acrylic acid neutralizer.

[0034] 3. Add 1.71 g of ammonium persulfate and 0.79 g of sodium bisulfite, react at 60° C. for 45 minutes under nitrogen protection, cool the product, dry and pulverize to obtain a powdery water-absorbent resin.

[0035] The product (water-absorbent resin 1) in the present embodiment is a white powder, measured by tea bag weighing method, every gram of resin absorbs 785 grams of distilled water, 405 grams of tap water, and 115 grams of water absorption to 0.9% sodium chloride aqueous solution. ...

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Abstract

The present invention is amphoteric ion high water absorption resin, which has a water absorption amount on distilled water higher than 700 g / g resin, on tap water higher than 400 g / g resin and on 0.9 % concentration water solution of NaCl higher than 100 g / g resin. The preparation process includes neutralizing acrylic acid monomer with alkali solution, adding water soluble cellulose, acrylamide, cationic ethylene polymer monomer and water to form mixed reaction system; adding free radical polymerization reaction initiator and non-ionic cross-linking agent to produce grafting copolymerization; dewatering after finishing reaction, drying and crushing to obtain the amphoteric ion electrolyte resistant high water absorption resin. The present invention has the advantages of high gel strength, low soluble component content and high enzymolysis resistance.

Description

technical field [0001] The invention relates to a water-absorbing resin and a preparation method thereof, in particular to a zwitterionic super-water-absorbing resin and a preparation method thereof. Background technique [0002] The superabsorbent resin was first successfully developed by the Northern Research Institute of the United States Department of Agriculture in 1969. The method was to graft and copolymerize corn starch and acrylonitrile, and then hydrolyze it with sodium hydroxide. Because the acrylonitrile monomer used in this method is highly toxic and the hydrolysis process is complicated, Japan later replaced acrylonitrile with acrylic acid, and then directly grafted and polymerized it with starch. Since then, countries all over the world have competed to develop a variety of superabsorbent resins, which have been widely used in physiological hygiene, agriculture and horticulture, and civil engineering. However, the residual acrylic acid in synthetic resin-base...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F251/02
Inventor 商士斌宋湛谦王丹谭卫红
Owner JIANGSU QIANGLIN BIO ENERGY
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