Agricultural moisture-retaining material made of stalk protofibril graft acrylate derivative and mfg method

An acrylic and derivative technology, applied in the field of copolymerization water-retaining materials and the production process of water-retaining materials, can solve the problems of high production cost and cannot be applied on a large scale, so as to reduce the cost of raw materials, reduce the degree of damage, and eliminate the discharge of three wastes. Effect

Inactive Publication Date: 2004-06-09
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method partially alleviates the environmental pressure and reduces the cost, but the raw materials still use high-purity starch and cellulose, and the reverse-phase polymerization uses a large amount of expensive organic solvent—n-hexane, which has high production costs and cannot be used in large-scale agriculture. application, this kind of grafted water-absorbent resin has no prospect of industrialization
And because starch graft polymerization or cellulose graft polymerization SAP is at a disadvantage compared with polyacrylic acid (salt) in terms of industrial post-processing and storage and transportation, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] a) Crush the straw into powder with a particle size of 40-60 mesh; b) Weigh 100 grams of crushed wheat straw powder, add 1 gram of sodium dihydrogen phosphate, 5 grams of urea and 200 ml of water, stir well, and mix well , placed in an oven at 50° C. for 10 hours, and then kept at 140-160° C. for 3 hours and taken out to obtain denatured straw powder. c) At room temperature, add 50 grams of acrylic acid, 225 grams of sodium acrylate and 225 grams of acrylamide into a beaker to form a 1500-gram aqueous solution; add 0.7 grams of polyethylene glycol (400) and 1.2 grams of ammonium persulfate to the solution , stir evenly, d) add the treated denatured straw to the aqueous solution, add 0.6 g of sodium bisulfite after stirring evenly, continue stirring until the temperature no longer rises, e) place it in a 60°C oven for 2 hours, and then Keep warm in a steam pot at about 120°C for 3 hours. Discharge, dry below 120°C, and pulverize to obtain a product with a water absorpti...

Embodiment 2

[0041]a) Crush the straw into powder with a particle size of 30-50 mesh; b) Weigh 100 grams of crushed wheat straw powder, add 10 grams of sodium dihydrogen phosphate, 10 grams of urea and 200 ml of water, stir well, and mix well , placed in an oven at 50° C. for 10 hours, and then kept at 140-160° C. for 3 hours and taken out to obtain denatured straw powder. c) At room temperature, add 50 grams of methacrylic acid and 50 grams of sodium acrylate to a beaker to prepare a 1200-gram aqueous solution; add 0.24 grams of N,N-methylenebisacrylamide and 0.4 grams of magnesium hydroxide to the solution , 1.2 grams of ammonium persulfate, stirring evenly; d) adding the treated denatured straw to the aqueous solution, stirring evenly, adding 0.6 g of sodium bisulfite, and continuing to stir until the temperature no longer rises. e) Place it in an oven at 60°C for 2 hours, and then keep it in a steam pot at about 120°C for 3 hours. Discharge, dry below 120°C, and pulverize to obtain a ...

Embodiment 3

[0044] a) crush the straw into powder with a particle size of 70-90 mesh; b) weigh 100 grams of crushed wheat straw powder, put in 8 grams of sodium phosphate, 6 grams of urea and 200 milliliters of water, fully stir, mix evenly, place Insulate in an oven at 50 DEG C for 10 hours, then incubate at 140-160 DEG C for 6 hours and take out to obtain denatured straw powder. c) Prepare 1100 grams of aqueous solution at room temperature, containing 80 grams of acrylic acid, 150 grams of potassium acrylate, and 56 grams of ethyl methacrylate; then add 0.24 grams of N, N-methylenebisacrylamide, 0.15 grams to the solution Polyglycerol, 0.08 grams of magnesium acetate, 2 grams of 30% hydrogen peroxide, stir evenly; d) add the treated denatured stalks to the aqueous solution, add 0.6 grams of L-ascorbic acid after stirring, continue to stir until the temperature does not rise high. e) Keep it in an oven at 80°C for 3 hours, and then keep it in a steam pot at about 100°C for 3 hours. The...

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Abstract

The present invention relates to a water-retaining material obtained by copolymerizing straw raw fibre and acrylic acid derivative and its preparation process. Said process includes the following steps: adding cross-linking agent and initiator in acrylic acid derivative monomer, then adding modified straw powder and initiation adjuvant, in the solution, uniformly stirring them, drying and pulverizing so as to obtain the invented water-absorbing resin.

Description

technical field [0001] The invention relates to an agricultural water-retaining material, in particular to a copolymerized water-retaining material obtained by grafting straw fibrils with acrylic acid (salt), and a manufacturing process of the water-retaining material. Background technique [0002] Water-retaining materials have a high water-absorbing capacity, and have been used as water-retaining agents in agriculture and forestry, sanitary materials, slow-release agents for spices, etc. In addition to the requirements for water absorption capacity, it is generally required to have a high water retention capacity. For water retention agents widely used in agricultural and forestry crops, it is also particularly required to be easily degradable and not damage the soil environment. [0003] At present, there are two main types of strong water-absorbents produced in industry, synthetic water-absorbent resins and grafted water-absorbent resins. Synthetic water-absorbent resin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F289/00
Inventor 任天瑞汪永生朱伟文沈斌王立勇
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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