Method for preparing water-retaining agent

A technology of water-retaining agent and cross-linking agent, applied in microorganism-based methods, biochemical equipment and methods, chemical instruments and methods, etc., can solve the problems of excessive degradation, poor gel strength and heat resistance, and poor salt resistance. , to achieve the effect of huge economic benefits

Active Publication Date: 2011-04-06
领先生物农业股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The advantages of this type of water retaining agent are low cost and fast water absorption, but the disadvantages are poor gel strength, heat resistance and salt resistance, and rapid degradation

Method used

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  • Method for preparing water-retaining agent
  • Method for preparing water-retaining agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] Add 4.8g of the γ-polyglutamic acid crude product described in this specification to a 50mL conical flask with a stopper, then add 20mL of distilled water, and after fully dissolving, add 1.44g of polypropylene glycol bisglycidyl ether crosslinking agent, stir evenly, and In the presence of a citric acid catalyst, γ-polyglutamic acid and polypropylene glycol bisglycidyl ether were reacted in a water bath at 60°C under the condition of pH 4.8-5.0 for 24 hours, and the obtained substance was evaporated and dried in a vacuum dryer for 24 hours. Then use a pulverizer to pulverize to a particle size of 80-100 mesh, and use the detection method described in the instructions to detect that the water absorption of the polymer is 900 times in distilled water, and the water absorption in physiological saline is 80 times.

[0060] The water-retaining agent was used in a pot test, and the results are shown in the table below. Put 600g of vermiculite in each pot, set the amount of w...

Embodiment 2

[0065] Add 2.8g of crude γ-polyglutamic acid to a 50mL Erlenmeyer flask with a stopper, then add 20mL of distilled water, after fully dissolving, add 0.84g of polypropylene glycol diglycidyl ether, stir well, and then in the presence of concentrated hydrochloric acid, at pH5 .1 React γ-polyglutamic acid and polypropylene glycol bisglycidyl ether in a water bath at 40°C for 30 hours, evaporate and dry the resulting substance in a vacuum dryer for 24 hours, and use a pulverizer to crush to a particle size of 80-100 mesh , using the detection method described in the manual to detect that the water-retaining agent prepared in this example has a water absorption multiple of 1200 times in distilled water, and an absorption multiple of 105 times in physiological saline.

Embodiment 3

[0067] Add 50g of gamma-polyglutamic acid fermentation broth (the content of gamma-polyglutamic acid is 17g / L) in a 100mL Erlenmeyer flask with a stopper, add 5g of polypropylene glycol diglycidyl ether, stir well, and then in the presence of concentrated hydrochloric acid , let γ-polyglutamic acid and polypropylene glycol bisglycidyl ether react in a 60°C water bath at pH 4.8 for 1 hour, then precipitate with 50 mL of absolute ethanol, dry the precipitate in an oven at 50°C for 24 hours, and then Use a pulverizer to crush to a particle size of 80-100 mesh, and use the detection method described in the manual to detect that the water-absorbing ratio of the water-retaining agent is 416 times in distilled water, and the water-absorbing ratio in normal saline is 68 times.

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Abstract

The invention relates to a method for preparing a water-retaining agent, which comprises the following step of: reacting gamma-polyglutamic acid fermentation liquor prepared by fermenting through bacillus subtilis, and aqueous solution of coarse gamma-polyglutamic acid or refined gamma-polyglutamic acid prepared from the fermentation liquor with a cross-linking agent in the presence of an inorganic acid or organic acid catalyst to obtain the water-retaining agent. The water-retaining agent has the water absorption multiple of 400-1,500 in distilled water and has the water absorption multiple of 60-150 in physiological saline. The water-retaining agent prepared by the microbiological technology is environment-friendly, so the water-retaining agent has great economic, environmental and social benefits in industries such as agriculture, forestry and the like in China.

Description

【Technical field】 [0001] The invention belongs to the technical field of polymer material application. More specifically, the present invention relates to a method for preparing an environment-friendly water-retaining agent by using the polymer material-γ-polyglutamic acid produced by microbial fermentation. 【Background technique】 [0002] my country's population accounts for 23% of the world's population, while my country's total water resources only account for 6% of the world's total, and my country's per capita water resources are only 2200m 3 , only 1 / 4 of the world average. Despite the lack of water resources, the rationality of my country's water resource utilization is still poor. The lack of water resources, irrational use and irrational cultivation have resulted in 2.62 million mu of desertified land in my country, accounting for 27.3% of the total area of ​​national land resources. Agriculture, industry and domestic water are all necessary to maintain normal hu...

Claims

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Application Information

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IPC IPC(8): C08L77/04C08L71/08C12P13/00C09K17/18C12R1/125C09K101/00
Inventor 朱瑞艳徐美娜杨娜徐志文
Owner 领先生物农业股份有限公司
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