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Coating film and production method of coated controlled-release fertilizer

A production method and technology of controlled-release fertilizers, which are applied in layered/coated fertilizers, fertilizer mixtures, fertilization devices, etc., can solve the problems of inability to release fertilizer nutrients, environmental pollution, and inability to cover fertilizers.

Inactive Publication Date: 2014-01-22
蔡小伶
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Either the fertilizer cannot be covered, the slow-release time is short, and the effect is relatively poor. Some manufacturers produce fertilizers that are too tightly packed, and the nutrients of the fertilizer cannot be released.
Ordinary inorganic matter and sulfur coating, the thickness of the coating is very thick, and the slow-release time is not long. However, if the PE coating is not very elastic, the fertilizer nutrients cannot be released well.
This method requires a large investment in the production of controlled-release fertilizer equipment. The investment in equipment with an annual output of 10,000 tons needs five to six million yuan. A lot of benzene solvents are used, and the solvent is easy to volatilize, causing serious environmental pollution and relatively serious physical harm to production workers.

Method used

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  • Coating film and production method of coated controlled-release fertilizer

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Embodiment Construction

[0026] As shown in Figure 1, the method of the present invention is carried out according to the following steps.

[0027] 1: The coating material raw materials A1: polyester polyol, A2: soybean oil polyol, A3: castor oil, A4: diethyltoluenediamine (DETDA) according to 20-30%, 40-50%, 20- 30% and 5-10% are mixed as material A, and material B is polymethylene polyphenyl isocyanate (PAPI). The ratio of material A to material B is about 6-7:3-4. The material A of this formula uses vegetable oil polyol and easily hydrolyzed polyester polyol. The polyurethane film produced by this method is easy to degrade, so as to ensure that the film is easy to degrade and not pollute soil and environment. Generally, other companies use polyether polyols. The membranes produced by this method are difficult to degrade in soil and water, and cause relatively large environmental pollution.

[0028] 2: Sieving: Sieve the fertilizer that needs to be coated, sift out the fertilizer with a particle s...

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Abstract

The invention relates to a coating film. The coating film contains materials A and B, wherein the material A mainly contains the following components in parts by weight: 20-30 parts of polyester polyol, 40-50 parts of soybean oil polyol, 20-30 parts of castor oil and 5-10 parts of diethyl methyl benzene diamine; and the material B is polyaryl polymethylene isocyanate.

Description

technical field [0001] The invention relates to a production method of film-coated and film-coated controlled-release fertilizers. Background technique [0002] China is the largest producer and consumer of fertilizers in the world, but the damage to the environment during the production and use of fertilizers is very serious, and the waste of resources is also very serious. In order to improve the utilization rate of fertilizers and reduce the amount of fertilizers used, the emergence of controlled-release fertilizers has solved this problem very well. However, the controlled-release fertilizers produced by most domestic controlled-release fertilizer manufacturers are generally coated with insoluble inorganic substances, sulfur or PE. Either the fertilizer cannot be covered, the slow release time is short, and the effect is relatively poor. The fertilizer produced by some manufacturers is too tightly packed, and the nutrients of the fertilizer cannot be released. Ordinary...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/67C08G18/42C08L75/14C05G3/00
CPCC05G5/37C08G18/324C08G18/36C08G18/6651C08G18/6662C08G18/7664C08G2310/00
Inventor 蔡小伶
Owner 蔡小伶
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