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Method for preparing cellulose polysaccharide degradable high water absorbing agent from crop straw

A technology of cellulose and high water absorption, applied in the field of comprehensive utilization of agricultural and sideline products and agricultural chemicals, can solve the problems of consuming organic solvents, polluting the environment, not easy to degrade, etc., and achieve good water absorption, simple production process and low cost.

Inactive Publication Date: 2008-05-28
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the existing methods for synthesizing SAP, there are still some shortcomings: some need to consume organic solvents, some need to be carried out under anaerobic conditions and use nitrogen, and some products are not easy to degrade after use and pollute the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Embodiment 1: the refining of corn stalk cellulose

[0014] Put 20kg of corn stalk powder into 400L, 5% nitric acid solution, stir at 80°C for 2h, filter and wash with suction, then add 300L, 5% sodium hydroxide solution, stir at 90°C for 3h, filter with suction, wash and beat repeatedly The cellulose was softened for 10 minutes, impurities were cleaned, bleached in 50 L of sodium hypochlorite solution with an available chlorine concentration of 5.8% for 2 hours, and dried at 50° C. to obtain 6.0 kg of white straw cellulose.

Embodiment 2

[0015] Example 2: Preparation of cellulose polysaccharide degradable water-absorbing agent by suspension method

[0016] Put 6.0kg of straw cellulose into the polymerization kettle, stir and heat to 60°C in 100L, 5% sodium hydroxide solution, make the cellulose gelatinize and swell to a jelly state, and cool to room temperature 25-30°C after 30 minutes. 25kg of acrylic acid monomer, 8kg of polyethylene glycol, and 100kg of deionized water were thrown into the polymerization tank, and 5% sodium hydroxide solution was slowly added to adjust the pH of the suspension to 7-8. After stirring evenly, add successively the initiator potassium persulfate of 0.2kg, the sodium bisulfite of 0.01kg, the crosslinking agent glycerin of 0.5kg, the surfactant Tween-60 of 0.08kg, the suspension is under stirring condition, at 60 ℃ to initiate the graft copolymerization reaction for 2 hours, then raise the temperature to 90 ℃ until a white milky gel is formed, wash repeatedly, dry and dehydrate i...

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PUM

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Abstract

The invention relates to a method for preparing cellulose polysaccharide degradable high water-absorbing agent from farm crop straws, belonging to the technical field of farm and side line products comprehensive utilization and agricultural chemicals. The invention relates to a method for using farm crop straws as main material to prepare high water-absorbing agent of cellulose polysaccharide, which comprises that refines cellulose substrate from farm crops straws and synthesizes water-absorbing agent. Taking corn straw as example, the invention refines cellulose and modifies functions, to obtain high water-absorbing agent functional material. The inventive high water-absorbing agent keeps original absorbing property of water-absorbing material, with simple production process, belonging to biological degradable product. The high water-absorbing agent has better water adsorption and retention properties, with wide application in drought resistance, desert greening, afforestation, food processing, and medical sanitation or the like, which can effectively develop cheap resources.

Description

technical field [0001] The invention discloses a method for preparing a cellulose polysaccharide degradable superabsorbent from crop straws, which belongs to the technical field of comprehensive utilization of agricultural by-products and agricultural chemicals. The invention relates to the preparation of a cellulose polysaccharide superabsorbent by using crop stalks as the main raw material, which has good biodegradable properties. Background technique [0002] Super absorbent polymer (SAP for short), because of its good water absorption and water retention performance, has shown great application prospects in the fields of drought resistance and fertilizer conservation, desert greening, afforestation, food processing, cosmetics, etc. , the fourth largest category of agrochemicals after films. [0003] In the 1980s, the United States used SAP for soil water retention, seedling cultivation, and breeding in agriculture and forestry. France uses SAP to produce "hydrated soil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F251/02
Inventor 徐学明杨哪金征宇谢正军赵建伟邓力
Owner JIANGNAN UNIV
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