Process for producing ultra-high salt supported hydrogel

A hydrogel, ultra-high technology, applied in fertilizer mixtures, fertilization devices, applications, etc., to achieve the effects of good water and fertilizer retention, improved fertilizer utilization, and stable performance

Inactive Publication Date: 2009-05-13
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Method used

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Experimental program
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Effect test

Embodiment 1

[0031] (1) prepare concentration 50% aqueous solution with ammonium nitrate;

[0032] (2) Acrylic acid is neutralized with sodium hydroxide, and the degree of neutralization of carboxyl groups is 70%;

[0033] Mix the organic monomer acrylamide and the acrylic acid that has neutralized the carboxyl group with the crosslinking agent α-glycidyl methacrylate and methylenebisacrylamide in the ratio of 1.5:3:0.2:0.3, and stir Added to the ammonium nitrate aqueous solution described in step (1), the weight percentage of the organic monomer and the crosslinking agent is 3%. Protect the polymerization system with nitrogen, and control the solution temperature to 75°C;

[0034] (3) Add the ammonium persulfate solution of 10% by weight to the solution prepared in step (2) under stirring, the addition of ammonium persulfate is 1% of the total mass of the organic monomer, and use nitrogen protection to polymerize system, the temperature of the solution is controlled at 75°C, and the pol...

Embodiment 2

[0037] (1) prepare the aqueous solution that concentration is 30% with ammonium chloride;

[0038] (2) neutralize the carboxyl group of α-methacrylic acid with ammonium hydroxide, and the degree of neutralization of the carboxyl group is 100%;

[0039] Mix the organic monomer acrylamide, hydroxypropyl acrylate, and α-methacrylic acid that has neutralized the carboxyl group with the crosslinking agent methylenebisacrylamide in a material ratio of 1.5:1:1:0.5, while stirring Add it into the ammonium chloride aqueous solution, so that the weight percentage of the organic monomer and the crosslinking agent is 10%. Protect the polymerization system with nitrogen (or argon or carbon dioxide), and control the solution temperature to 20°C;

[0040] (3) Potassium persulfate and sodium sulfite solution of 15% by weight are added under stirring in the solution prepared by step (2), and the addition of potassium persulfate and sodium sulfite is 0.5% of the total mass of organic monomers,...

Embodiment 3

[0043] (1) prepare the mixed aqueous solution of concentration 25% with ammonium bicarbonate, ammonium dihydrogen phosphate;

[0044] (2) neutralize acrylic acid with sodium hydroxide, and the degree of neutralization is 50%;

[0045]Mix acrylic acid, acrylamide, α-hydroxypropyl methacrylate and cross-linking agent ethylene bisacrylamide in the ratio of 3:1:0.5:0.8, and stir While adding to the ammonium salt aqueous solution, the total weight percentage of the organic monomer and the crosslinking agent is 10%. Protect the polymerization system with nitrogen, and control the solution temperature to 70°C.

[0046] (3) The ammonium cerium sulfate solution of 20% by weight is added in the solution prepared in step (2) under stirring, the ammonium cerium sulfate consumption is 1.5% of the total mass of organic monomers, and the polymerization reaction is 2 hours, namely Obtain the hydrogel of the present invention.

[0047] The beneficial effects of this embodiment are: the ultr...

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Abstract

The invention discloses a method for preparing an ultrahigh saline loaded aquagel. The method is to polymerize a saline solution, a mixed solution of an organic monomer and a cross-linking agent and an aqueous solution of an evocating agent through one-step polymerization to obtain the ultrahigh saline load aquagel, and successfully store both salt and water in a high-molecular gel network structure so as to realize integrated regulation and control of the water and the salt. The method selects proper cross-linking agent and organic monomer, so when the aquagel is applied to preparing gel state fertilizer for integrally controlling release of fertilizer and water, soluble salt exists in the aquagel in a mode of molecules or ions, and based on diffusion penetration principle, the cross-linking agent and the monomer can sustainably supply moisture, nutritive ingredients of nitrogen, phosphor and kalium and other plant required nutritive elements for plants. The gel state fertilizer prepared by the method is convenient to produce and apply, has good effect of moisture and fertility preservation, lower cost than a common water retention agent and great reduction of controlled release fertilizer, and has good application prospect to horticultural cultivation, drought resistance and seedling protection, desert reformation and other aspects.

Description

technical field [0001] The invention belongs to the technical field of controlled release, and relates to a method for preparing an integrated controlled release body of soluble salt and water, in particular to a method for preparing a hydrogel loaded with ultra-high salt (fertilizer) with integrated regulation of water and fertilizer. Background technique [0002] Most of the chemical fertilizers are inorganic soluble salts. In order to improve their utilization rate and reduce the pollution of the atmosphere, soil, groundwater, rivers and lakes due to the use of chemical fertilizers, the controlled release technology of fertilizers has been actively researched and developed in recent decades. . The application of coating technology to form coated controlled-release fertilizers is the most researched technology. It is expected to achieve the release speed of chemical fertilizers by selecting coating materials, controlling the thickness, porosity, degradation rate, and parti...

Claims

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Application Information

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IPC IPC(8): C05G3/00
Inventor 王正辉王红飞
Owner SOUTH CHINA AGRI UNIV
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