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Preparation method for agricultural water-retaining agent based on vermiculite and sodium alginate

An agricultural water-retaining agent, sodium alginate technology, applied in chemical instruments and methods, applications, agriculture, etc., can solve the problems of soil pollution, complex preparation process of water-retaining agent, high cost, etc., and achieve good biodegradability, abundant reserves, and high yield big effect

Inactive Publication Date: 2016-08-10
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problems existing in the prior art, the present invention provides a preparation method of an agricultural water-retaining agent based on vermiculite and sodium alginate, which overcomes the problems of complex preparation process, high cost and soil pollution of the water-retaining agent in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Take 30 parts of expanded vermiculite that has passed through a 200 mesh sieve, add 80 parts of deionized water, and stir at room temperature for 1 hour to prepare a vermiculite dispersion; dissolve 10 parts of sodium alginate in deionized water to make a mass concentration of 3% solution; dissolve 50 parts of acrylamide in 50 parts of deionized water; dissolve 50 parts of acrylic acid in deionized water to make a solution with a mass concentration of 50%, and react with potassium hydroxide with a mass concentration of 20% under stirring conditions Neutralization reaction, the degree of neutralization is 75% of the moles of acrylic acid; 0.25 parts of potassium persulfate is dissolved in 25 parts of deionized water to form a solution; 0.1 part of N, N-methylenebisacrylamide is dissolved in 10 parts of solution in deionized water. The above components were sequentially added into the polymerization reactor under stirring, and polymerized at room temperature for 2 hours. ...

Embodiment 2

[0028] Take 40 parts of raw vermiculite powder passed through a 200-mesh sieve, add 100 parts of deionized water, and stir at room temperature for 1 hour to form a vermiculite dispersion; dissolve 5 parts of sodium alginate in deionized water to make a mass concentration of 3%. solution; 70 parts of acrylamide was dissolved in 70 parts of deionized water; after 30 parts of acrylic acid was dissolved in deionized water to make a solution with a mass concentration of 50%, it was mixed with sodium hydroxide with a mass concentration of 20% under stirring conditions Neutralization reaction, the degree of neutralization is 60% of the number of moles of acrylic acid; 0.6 parts of potassium persulfate is dissolved in 60 parts of deionized water to form a solution; 0.1 part of N, N-methylenebisacrylamide is dissolved in 10 parts of solution in deionized water. The above components were sequentially added into the polymerization reactor under stirring, and polymerized at room temperatu...

Embodiment 3

[0030]Take 20 parts of raw vermiculite powder passed through a 200-mesh sieve, add 60 parts of deionized water, and stir at room temperature for 1 hour to form a vermiculite dispersion; dissolve 15 parts of sodium alginate in deionized water to make a mass concentration of 3%. solution; 40 parts of acrylamide was dissolved in deionized water to make a solution with a mass concentration of 50%, and after 60 parts of acrylic acid was dissolved in deionized water to make a solution with a mass concentration of 50%, under stirring conditions the mass concentration was 20% of potassium hydroxide is neutralized, and the neutralization degree is 65% of the moles of acrylic acid; 0.3 parts of potassium persulfate are dissolved in 30 parts of deionized water to form a solution; 0.05 parts of N,N-methylenebis Acrylamide was dissolved in 5 parts deionized water to make a solution. The above components were sequentially added into the polymerization reactor under stirring, and polymerized...

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Abstract

The invention discloses a preparation method for an agricultural water-retaining agent based on vermiculite and sodium alginate. Through matching among the usage amounts of vermiculite, sodium alginate and synthesis monomer and adjustment of the decomposition rate of an initiator potassium persulphate, the water-retaining agent is synthesized at room temperature. According to the invention, through cooperation of components of a reaction system, synthesis of the water-retaining agent at room temperature (20 to 35 DEG C) is realized by using the single-component initiator without nitrogen protection, so energy consumption is low, and nitrogen introducing equipment and auxiliary equipment used due to addition of reduction components are not needed; thus, production cost is reduced in a plurality of aspects like raw materials, energy consumption and equipment, and the preparation method has an obvious cost advantage, is simple in process and can easily realize industrial production. The water-retaining agent retains good water absorbing performance when the content of the natural component vermiculite and sodium alginate is as high as 40%. The water-retaining agent has wide application prospects in the fields of farming, forestry and gardening.

Description

technical field [0001] The invention belongs to the field of superabsorbent resins, and relates to a method for preparing a water-retaining agent, in particular to a method for preparing an agricultural water-retaining agent based on vermiculite and sodium alginate. Background technique [0002] Water-retaining agent, also known as superabsorbent resin, is a slightly cross-linked hydrophilic polymer that can absorb water hundreds of times its own weight in a short period of time, and can be slowly released and added to the soil It can increase soil water content, reduce soil bulk density, reduce soil erosion, and play an important role in drought resistance, water conservation, water and soil conservation and soil improvement. Water retaining agents are mainly divided into synthetic and semi-synthetic from the source of raw materials. Synthetic products are mainly polyacrylic acid and polyacrylamide; semi-synthetic products are graft copolymers of polysaccharides such as st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F251/00C08F220/56C08F220/06C08F222/38C08K7/26C08K3/34C09K17/40C09K101/00
CPCC08F251/00C08K3/34C08K7/26C09K17/40C09K2101/00C08F220/56C08F220/06C08F222/385
Inventor 邱海霞邱朝霞
Owner TIANJIN UNIV
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