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Coating agent for slow release fertilizer

A technology of slow-release fertilizers and coating agents, applied in application, fertilizer mixtures, fertilization devices, etc., can solve the problems of difficult degradation of coatings, environmental pollution, etc., reduce production costs, solve moisture absorption and agglomeration, and improve appearance quality Effect

Inactive Publication Date: 2004-09-15
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, foreign controlled-release fertilizer products are mainly coated with synthetic polymers, and a large amount of organic solvents must be used. To varying degrees, there are disadvantages such as difficult degradation of the coating and easy environmental pollution.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0028] Preparation of coating agent:

[0029] Add 10 liters of 2.0 (wt)% chitosan acetic acid aqueous solution, 18 kilograms of starch gelatinization liquid, 2.5 kilograms of PVA, 0.35 liters of glycerin and 0.1 liter of Tween 80 in the reaction kettle, adjust the pH to 3, and heat up while stirring To 90 ° C, add 1.5 liters of 37% formaldehyde solution, keep the temperature and stir for 1 hour, add 0.05 kg NH 4 Cl, continue stirring for 10 minutes, discharge and transfer to the coating agent storage tank for subsequent use.

[0030] Coating film:

[0031] Take 100 kg of granular fertilizer and put it into the coating equipment, set the sheet temperature to 65°C, and the coating pot to rotate at 15 rpm. Start the hot air heating device. When the sheet temperature reaches the set temperature, slowly pour in the paraffin wax that has been melted into liquid in advance (melting point is 55-63°C), stop heating, rotate for 15 minutes and then pass in cold air to cool down the gr...

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PUM

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Abstract

The invention relates to an enveloping agent applied to sustained release fertilizer, using chitosan 1-10wt%, amylum 30-40wt%, vinol 45-55wt%, cross-linking agent 2-10wt%, glycerol 6-8wt%, tween 1-3wt% and NH4Cl 0.5-1.5wt% as main raw materials, reacting for 1-2 hours at pH value of 2-5 and at 85-95 deg.C to make it. Its preparation is simple and its raw material source is wide and it has no environmental pollutions.

Description

technical field [0001] The invention relates to a coating agent applied to slow-release fertilizers. Background technique [0002] Fertilizer is one of the most important means of production in agriculture. China is the world's largest consumer of chemical fertilizers and the second largest producer of chemical fertilizers. But the loss of chemical fertilizer is a very serious problem. It is not only a direct economic loss and a waste of a lot of resources. What is more serious is that the lost chemical fertilizer has and continues to have adverse consequences on our living environment, such as water pollution, air pollution, and agricultural products. Pollution and the greenhouse effect and other issues, and will lead to an increase in the incidence of cancer, endangering human health. Improving fertilizer utilization efficiency, reducing or eliminating fertilizer pollution, and developing sustainable and efficient agriculture are common concerns of all countries. A larg...

Claims

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Application Information

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IPC IPC(8): C05G3/00C08L29/04
Inventor 陈强张文清吕伟娇金鑫荣邓修
Owner EAST CHINA UNIV OF SCI & TECH
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