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Degradable fertilizer coating liquid and manufacturing method thereof

A technology of fertilizer coating and weight ratio, which is applied in the direction of fertilizer form, fertilizer mixture, fertilization device, etc., can solve the problems of increasing the cost of membrane materials, slow degradation of coating materials, and complicated production processes, so as to improve the utilization rate of fertilizers and make The effect of simple process and wide source of raw materials

Inactive Publication Date: 2007-10-03
SHENYANG AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A large amount of benzene and harmful solvents containing chloride ions are released during the production of fertilizer coatings with these polymers, which not only pollutes the environment, is expensive, and has complicated production processes, but more seriously, such coatings After the fertilizer nutrients are exhausted, the polymer coating material remaining in the soil degrades slowly or even does not degrade. If things go on like this, the soil structure will be destroyed and the growth of crops will be adversely affected.
Now Japanese scholars use the method of adding photosensitizer (the main component is iron acetate) to speed up the degradation rate of membrane materials in the natural environment, but it increases the cost of membrane materials.

Method used

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  • Degradable fertilizer coating liquid and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Put 5g of chitosan into a beaker according to the weight ratio of the coating solution, add 2g of glacial acetic acid and 10g of distilled water, heat, and stir at 45°C for 40 minutes to make a chitosan glacial acetic acid solution; Add 5g of polyvinyl alcohol (PVA) with a degree of polymerization of 1700-1800, 3g of oxidized starch, and 64.35g of distilled water into the three-necked flask with a thermometer and a thermometer, and heat to 88°C under stirring to dissolve completely, leave it at room temperature, and add chitosan Sugar glacial acetic acid solution, bentonite 2g, formaldehyde 1g, gelatin 0.5g, N-butyl thiophosphoric triamide (NBPT) 0.05g, thiourea 0.1g, heated to 85°C, stirred at high speed for 2h, and the coating material was formed liquid. The coating material is then applied to the granular fertilizer using a drum process.

Embodiment 2

[0025] Put 8g of chitosan into a beaker according to the weight ratio of the coating solution, add 3g of glacial acetic acid and 15g of distilled water, heat, and stir at 45°C for 40 minutes to make a chitosan glacial acetic acid solution; Add 15g of polyvinyl alcohol (PVA) with a degree of polymerization of 1700-1800, 6g of oxidized starch, and 49.8g of distilled water into the three-necked flask with a degree of polymerization of 1700-1800, and heat to 90°C under stirring, dissolve completely, place at room temperature, and add chitosan Sugar glacial acetic acid solution, diatomaceous earth 3.5g, formaldehyde 3g, gelatin 1.5g, N-butyl thiophosphoric triamide (NBPT) 0.2g, thiourea 0.3g, heat to 90°C, stir at high speed for 1h, and serve Coating material liquid. The coating solution is then applied to the granular fertilizer.

Embodiment 3

[0027] Put 10g of chitosan into a beaker according to the weight percentage of the coating solution, add 4g of glacial acetic acid and 20g of distilled water, heat, and stir at 50°C for 30 minutes to make a chitosan glacial acetic acid solution; Add 20g of polyvinyl alcohol (PVA) with a degree of polymerization of 1700-1800, 10g of cornstarch, and 31.5g of distilled water into the three-necked flask with a thermometer and a thermometer, and heat to 94°C under stirring to dissolve completely, leave it at room temperature, and add chitosan Sugar glacial acetic acid solution, clay 5g, formaldehyde 4g, gelatin 1.5g, N-butyl thiophosphoric triamide (NBPT) 0.5g, thiourea 0.5g, heat to 90°C, stir at high speed for 1.5h to form a coating material liquid. The coating solution is then applied to the granular fertilizer.

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Abstract

A degradable coating liquid for fertilizer is proportionally prepared from chitosan, PVA, oxidized starch or corn starch, benton or talc powder or diatomite or clay, formaldehyde, gelatin, N-butylthiophosphoryl triamine (NBPT) or dicyandiamide (DCD), thiourea or urea, glacial acetic acid, and distilled water. Its preparing process is also disclosed.

Description

technical field [0001] The invention relates to a fertilizer coating solution and a manufacturing method thereof. Background technique [0002] In view of the current low utilization rate of chemical fertilizers and the increasing pollution of the ecological environment caused by fertilizer loss, improving fertilizer utilization rate, reducing or avoiding environmental pollution caused by fertilizer loss, and developing sustainable and efficient agriculture have become common concerns of all countries. . In order to solve the above problems, scholars at home and abroad have successively carried out the development and production of coated slow-release fertilizers. There are many foreign patents on polymer coated fertilizers. For example, British Patent (GB2011367 A) discloses a coated granular fertilizer and a production method thereof. The coating solution is made of polyolefin or vinyl resin. Japanese patent (1279683) (1985) patent discloses a kind of film-covered fertil...

Claims

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Application Information

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IPC IPC(8): C05G3/00C05G3/08C05G5/00C05G3/90
Inventor 张玉龙邹洪涛黄毅虞娜
Owner SHENYANG AGRI UNIV
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