Method for preparing super absorbent resin with cross-linked structure from potato starch phosphate graft co-polymeric acrylic acid and sodium salt thereof

A technology of starch phosphate ester and superabsorbent resin, which is applied in the field of superabsorbent resin, can solve the problems of complex production process, easy mildew and rot, and high product cost, and achieve the effects of simplifying the process flow, strong anti-mold ability, and increasing income

Inactive Publication Date: 2010-04-07
INNER MONGOLIA UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, the gel strength after water absorption is low, the production process is complicated, and the product cost is high, and the product is prone to mildew and rot during storage.

Method used

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  • Method for preparing super absorbent resin with cross-linked structure from potato starch phosphate graft co-polymeric acrylic acid and sodium salt thereof
  • Method for preparing super absorbent resin with cross-linked structure from potato starch phosphate graft co-polymeric acrylic acid and sodium salt thereof
  • Method for preparing super absorbent resin with cross-linked structure from potato starch phosphate graft co-polymeric acrylic acid and sodium salt thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1: Weigh 7.8g of sodium hydroxide, measure 26.4ml of deionized water, prepare sodium hydroxide solution, and neutralize 30.0g (28.6ml) of acrylic acid under the conditions of cooling and stirring in an ice-water bath. Take by weighing 5.0g potato starch phosphate, mix potato starch phosphate with 15ml deionized water, 88mg potassium persulfate initiator, 1mgN, N'-methylenebisacrylamide crosslinking agent and the obtained acrylic acid and its sodium salt The solutions were mixed and stirred at room temperature for 1 hour. After mixing evenly, nitrogen gas was introduced and heated under stirring. The heating rate was controlled to increase the temperature of the water bath slowly so that the graft copolymerization reaction fully proceeded. When the temperature reached 60°C, the stirring was stopped. Afterwards, gradually increase the temperature, and when it reaches the boiling water bath, continue heating to keep it in this temperature range for 1-2 hours, stop t...

Embodiment 2

[0023]Example 2: Weigh 7.5g of sodium hydroxide, measure 20.0ml of deionized water, prepare a sodium hydroxide solution, and neutralize 30.0g (28.6ml) of acrylic acid under the conditions of cooling and stirring in an ice-water bath. Take by weighing 5.0g potato starch phosphate, mix potato starch phosphate with 16.5ml deionized water, 88mg potassium persulfate initiator, 1mgN, N'-methylene bisacrylamide cross-linking agent and the obtained acrylic acid and its sodium Mix the salt solution and stir at room temperature for 1 hour. After mixing evenly, pass nitrogen gas and heat while stirring. Control the heating rate to increase the temperature of the water bath slowly to fully proceed the graft copolymerization reaction. Stop stirring when the temperature reaches 60°C. Afterwards, gradually increase the temperature, and when it reaches the boiling water bath, continue heating to keep it in this temperature range for 1-2 hours, stop the nitrogen flow, and cool to room temperatu...

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Abstract

The invention discloses a method for preparing super absorbent resin with a cross-linked structure from potato starch phosphate graft co-polymeric acrylic acid and a sodium salt thereof. The method comprises the following main technological processes of: under ice water bath cooling, performing neutralization reaction between a sodium hydroxide solution and acrylic acid used for removing a polymerization inhibitor so as to prepare the acrylic acid and a sodium salt solution of the acrylic acid; mixing the prepared acrylic acid and the sodium salt solution of the acrylic acid with potato starch phosphate; adding an initiator of persulfate, a crosslinking agent of N,N'-methylene bi-acrylamide so that the mixture is mixed evenly under stirring; then under the protection of nitrogen gas, heating the mixture in a water bath and stirring the mixture so that the potato starch phosphate performs graft copolymerization with the acrylic acid and the sodium salt solution of the acrylic acid; stopping stirring after reaching a certain temperature, performing heat preservation reactions, and then stopping introducing the nitrogen gas; and taking out a product, cutting the product into small pieces, drying the small pieces in a drying oven to have constant weights, and crushing the small pieces to obtain the super absorbent resin.

Description

technical field [0001] The invention relates to a method for preparing a superabsorbent resin with a cross-linked structure by graft-copolymerizing acrylic acid and its sodium salt with potato starch phosphate. This kind of super absorbent resin with a large amount of water absorption or binding has a wide range of applications in many fields, such as breeding seedlings, drought resistance, income increase, soil erosion prevention and desertification control, etc., and has achieved great success in the above fields . Background technique [0002] Superabsorbent resin is a new type of three-dimensional network functional polymer material with lightly cross-linked structure. It is insoluble in water and in organic solvents. It has the ability to absorb water hundreds or even thousands of times its own weight. It absorbs water fast and has good water retention performance. Even if it is pressurized, it is difficult to separate water. It has good acid and alkali stability and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F251/00C08K5/20
Inventor 温国华杜青慧曲秀清目仁更付渊张伟
Owner INNER MONGOLIA UNIVERSITY
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