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Preparation method of natural-polymer-based slow-release fertilizer

A natural polymer, slow-release fertilizer technology, applied in the directions of potash fertilizer, phosphate fertilizer, organic fertilizer, etc., can solve the problems of burning seedlings, fertilizers without slow-release properties, improper fertilization, etc., to reduce production costs, improve fruit quality, and promote crops. effect of growth

Inactive Publication Date: 2018-04-13
马磊峰
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims at the fact that the existing sodium alginate-prepared fertilizer has no slow-release performance, improper fertilization may cause seedling burning, and provides a preparation method of a natural polymer-based slow-release fertilizer

Method used

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  • Preparation method of natural-polymer-based slow-release fertilizer
  • Preparation method of natural-polymer-based slow-release fertilizer
  • Preparation method of natural-polymer-based slow-release fertilizer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Example 1, weigh polyvinyl alcohol, urea phosphate and potassium hydroxide according to the mass ratio of 1:21.35:1.25, and the mass ratio of p-toluenesulfonic acid to urea phosphate is 1.5%.

[0030] The first step is to prepare polymer slow-release liquid fertilizer. Weigh polyvinyl alcohol, add it to a flask, then add distilled water, and stir until the polyvinyl alcohol is dissolved at 90°C; and react for 100-150 minutes; then add potassium hydroxide, and react for 80-100 minutes at 90-100°C. After the reaction, polymer slow-release liquid fertilizer is obtained;

[0031] Second step, prepare 3% borate calcium chloride solution;

[0032] The third step is to mix the polymer slow-release liquid fertilizer and sodium alginate evenly to obtain a mixed solution;

[0033] In the fourth step, the mixed solution obtained in the third step is added dropwise to the 3% calcium chloride borate solution in the second step, and soaked for 30 minutes to obtain a natural polymer-...

Embodiment 2

[0037] Example 2, weigh polyvinyl alcohol, urea phosphate and potassium hydroxide according to the mass ratio of 1:21.35:1.25, and the mass ratio of p-toluenesulfonic acid to urea phosphate is 1.5%.

[0038] The first step is to prepare polymer slow-release liquid fertilizer. Weigh polyvinyl alcohol, add it to a flask, then add distilled water, and stir until the polyvinyl alcohol is dissolved at 90°C; and react for 100-150 minutes; then add potassium hydroxide, and react for 80-100 minutes at 90-100°C. After the reaction, polymer slow-release liquid fertilizer is obtained;

[0039] Second step, prepare 3% borate calcium chloride solution;

[0040] The third step is to mix the polymer slow-release liquid fertilizer and sodium alginate evenly to obtain a mixed solution;

[0041] In the fourth step, the mixed solution obtained in the third step is added dropwise to the 3% calcium chloride borate solution in the second step, and soaked for 40 minutes to obtain a natural polymer-...

Embodiment 3

[0045] In Example 3, polyvinyl alcohol, urea phosphate and potassium hydroxide were weighed according to a mass ratio of 1:21.35:1.25, and the mass ratio of p-toluenesulfonic acid to urea phosphate was 1.5%.

[0046]The first step is to prepare polymer slow-release liquid fertilizer. Weigh polyvinyl alcohol, add it to a flask, then add distilled water, and stir until the polyvinyl alcohol is dissolved at 90°C; and react for 100-150 minutes; then add potassium hydroxide, and react for 80-100 minutes at 90-100°C. After the reaction, polymer slow-release liquid fertilizer is obtained;

[0047] Second step, prepare 3% borate calcium chloride solution;

[0048] The third step is to mix the polymer slow-release liquid fertilizer and sodium alginate evenly to obtain a mixed solution;

[0049] In the fourth step, the mixed solution obtained in the third step is added dropwise to the 3% calcium chloride borate solution in the second step, and soaked for 60 minutes to obtain a natural ...

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Abstract

The invention relates to a preparation method of natural-polymer-based slow-release fertilizer, belongs to the technical field of slow-release fertilizer and can solve the problems that existing fertilizer prepared by sodium alginate does not have slow release performance, and seedling burning is caused possibly if the fertilizer is not applied properly. The preparation method is characterized inthat polymer slow-release liquid fertilizer is prepared, the polymer slow-release liquid fertilizer is blended with sodium alginate, and boric acid and a calcium chloride solution are dropwise added;sodium ions in sodium alginate molecules is substituted by calcium ions in calcium chloride to generate water-insoluble calcium alginate, and polyvinyl alcohol, which does not participate in the reaction, in the polymer slow-release liquid fertilizer has reaction with boric acid to have surface crosslinking to finally form gel particles containing nitrogen, phosphorus and potassium. The fertilizerprepared by the method has slow-release performance.

Description

technical field [0001] The invention belongs to the technical field of slow-release fertilizers, and in particular relates to a preparation method of natural polymer-based slow-release fertilizers. Background technique [0002] Sodium alginate is also known as sodium alginate, kelp gum, alginate, and alginate. Alginic acid and its salts are long-chain polymer compounds formed by the polymerization of D-mannuronic acid (abbreviated as M) and L-guluronic acid (abbreviated as G), with a molecular weight of 10 6 Left and right, the structure of sodium alginate is as follows: [0003] . [0004] The main molecular chain of sodium alginate has strong hydrophilic groups -COONa, -COOH and -OH. It is a polyanion electrolyte, which can exchange, complex and chelate with acidic cations. The mechanism of superabsorbent resin absorbing water mainly through the formation of a hydrogen chain association structure between the strong hydrophilic groups on the polymer chain and water mol...

Claims

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Application Information

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IPC IPC(8): C05G3/00C05G3/04C05G3/80
CPCC05B15/00C05G3/00C05G3/80C05G5/20C05D1/00C05D3/00C05D9/02C05F11/00
Inventor 马磊峰
Owner 马磊峰
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