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Method for synthesizing high water absorption resin by glutinous wheat starch

A technology of superabsorbent resin and waxy wheat, which is applied in the field of wheat starch superabsorbent resin and superabsorbent resin, can solve the problems of product saponification and complicated process, and achieve the effect of low cost, simple process and good safety

Inactive Publication Date: 2007-10-03
NORTHWEST A & F UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent CN1560099 discloses a starch-based superabsorbent resin, but the product needs to be saponified and the process is complicated

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Under stirring conditions, 25% sodium hydroxide solution was added to 60 ml of acrylic acid (monomer) to make the neutralization degree of acrylic acid reach 75%, and then cooled to room temperature.

[0021] Put 3.5g waxy wheat starch and 50ml distilled water into a 1000ml beaker equipped with an electric stirrer, gelatinize at 80℃ for 20min, then cool to reaction temperature 50℃, pass nitrogen protection, add pre-neutralized acrylic acid, and mix After 5 minutes, add 5.5ml of initiator ammonium persulfate 4% solution and 0.70ml of crosslinking agent N, N'-methylenebisacrylamide 2% solution, stop the reaction when the product is a gel mass, cool down After reaching room temperature, the reaction product is cut into pieces, freeze-dried in vacuum at -60°C for 72 hours, crushed, and passed through an 80-mesh sieve to obtain a super absorbent resin product. After testing, the product obtained in this example absorbs 703.8 g / g of deionized water and 57.3 g / g of salt water.

Embodiment 2

[0023] The experimental conditions are the same as in Example 1. The difference is that the reaction temperature is 55°C, the amount of initiator is 6.0ml, the amount of crosslinking agent is 0.75ml, the product obtained at the end of the reaction has 1100.4g / g of deionized water and salt water of 1100.4g / g. 64.2g / g.

Embodiment 3

[0025] The experimental conditions are the same as in Example 1. The difference is that the reaction temperature is 60°C, the amount of initiator is 6.5ml, the amount of crosslinking agent is 0.80ml, the deionized water of the product obtained after the reaction is 974.8g / g, and the salt water is 974.8g / g. 62.1g / g.

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PUM

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Abstract

This invention relates to a method of using glutinous cereal wheat starch to synthesize water absorbent resina. The acroleic acid monomer after neutralizing generate acrylate which can takes reaction with glutinous cereal wheat starch, acroleic acid; under protective system of nitrogen, adopt proper initiator and cross-linking agent, through neutralization and cross linking reaction to generate water absorbent graft copolymer which possess certain crosslink density. This invention adopts typic ammonium persulfate for trigger off, and adopts N, N -methylene bisacrylamide to create proper crosslinking. The course of reaction is geniality, cost low, and product has no need of washing and saponification and so on aftertreatment process. The product can absorb deionized water 600g / g to 1200g / g, suck brine 50g / g to 100g / g. The water retentivity, thermostability and reusing quality of the product are better. It has extensive application prospects at aspect of waterholding material.

Description

Technical field [0001] The invention belongs to the technical field of functional polymer materials, and relates to a super absorbent resin, in particular to a method for synthesizing waxy wheat starch super absorbent resin by using waxy wheat starch (Waxy Wheat Starch). Background technique [0002] Super absorbent resin (Super absorbent resin, also called Super absorbent polymer, SAR or SAP for short) is a typical functional polymer material that can absorb and retain water hundreds or even thousands of times its own weight. It is a high-molecular compound with three-dimensional network structure and low cross-linking degree and strong hydrophilicity. Compared with ordinary water-absorbing or moisture-absorbing materials, it has the characteristics of large water absorption, fast water absorption, and strong water retention capacity. The research and development of super absorbent resin began in the 1960s. After more than 40 years of development and re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F251/00
Inventor 张国权游新勇欧阳韶辉罗勤贵胡新中郑建梅
Owner NORTHWEST A & F UNIV
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