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Method for preparing sustained-release material coating agent

A slow-release fertilizer and coating agent technology, which is applied to fertilizer mixtures, fertilization devices, applications, etc., can solve the problems of high price of synthetic polymer-coated fertilizers, complicated production processes and high production costs, and is easy to popularize and apply in large areas. , the production process is simple, the effect of slowing the release rate

Inactive Publication Date: 2012-06-20
FUJIAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the reduction of petroleum resources and the rising price, the use of synthetic polymer coated fertilizers is expensive
These methods generally have poor sustained-release effect, complex production process, and high production cost.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The coating agent components are as follows:

[0020] 30 kg of cashew nut oil with a cardanol content of 85%, 1.5 kg of hexamethylenetetramine, 30 kg of polyoxypropylene glycol (PPG-200), 15 kg of polyethylene adipate, and 20 kg of toluene diisocyanate .

[0021] The preparation method is as follows:

[0022] Add cashew nut oil and hexamethylenetetramine into the reaction kettle, stir and mix evenly, heat to 130°C, and keep warm for 1.5 hours; after the heat preservation is completed, cool to 35~40°C, then add polyoxypropylene The ethylene glycol diacid and toluene diisocyanate are stirred and mixed uniformly and cooled to room temperature to obtain the slow-release fertilizer coating agent of the present invention.

[0023] When in use, use the method of fluidized bed coating, put 500 kg of granular fertilizer into the fluidized bed coating machine, spray 40 ± 3 kg of coating agent on the rolling fertilizer particles, and ventilate and dry at the same time, until the...

Embodiment 2

[0025] The coating agent components are as follows:

[0026] It consists of 65 kg of cashew nut oil with a cardanol content of 50%, 0.5 kg of hexamethylenetetramine, 50 kg of polyoxypropylene glycol (PPG-200), and 15 kg of diphenylmethane diisocyanate.

[0027] The preparation method is as follows:

[0028] Add cashew nut oil and hexamethylenetetramine into the reaction kettle, stir and mix evenly, heat to 110°C, and keep warm for 2 hours; after the heat preservation is completed, cool to 30~35°C, then add polyoxypropylene glycol, diphenyl Methyl methane diisocyanate was stirred and mixed evenly and cooled to room temperature to obtain the slow-release fertilizer coating agent of the present invention.

[0029] When in use, use the method of fluidized bed coating, put 1000 kg of granular fertilizer into the fluidized bed coating machine, spray 85 ± 3 kg of coating agent on the rolling fertilizer particles, and ventilate and dry at the same time, until the particles are formed...

Embodiment 3

[0031] The components of the coating agent are as follows: 45 kg of cashew nut oil with a cardanol content of 75%, 3.5 kg of hexamethylenetetramine, 30 parts of polyethylene adipate, and 18 parts of diphenylmethane diisocyanate.

[0032] The preparation method is as follows:

[0033] Add cashew nut oil and hexamethylenetetramine into the reaction kettle, stir and mix evenly, heat to 120°C, and keep warm for 2.5 hours; after the heat preservation is completed, cool to 30~35°C, then add polyethylene adipate, Diphenylmethane diisocyanate is stirred and mixed uniformly and cooled to room temperature to obtain the slow-release fertilizer coating agent of the present invention.

[0034] When in use, use the method of fluidized bed coating, put 1000 kg of granular fertilizer into the fluidized bed coating machine, spray 85 ± 3 kg of coating agent on the rolling fertilizer particles, and ventilate and dry at the same time, until the particles are formed After a layer of uniform separ...

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PUM

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Abstract

The invention relates to a method for preparing a sustained-release material coating agent, which is characterized in that: (1) the sustained-release material coating agent comprises the following components in part by weight: 30 to 65 parts of cashew nut oil, 0.5 to 3.5 parts of hexamine, 30 to 50 parts of polyol and 15 to 20 parts of polyisocyanate; and (2) the sustained-release material coating agent is prepared by mixing the cashew nut oil and hexamine in a reaction kettle, stirring mixture uniformly, heating the mixture, keeping the temperature, cooling the mixture, adding the polyol andpolyisocyanate, stirring and mixing the new mixture uniformly, and cooling the new mixture to room temperature. A coated fertilizer can be manufactured by placing a granular fertilizer into a fluidized bed coating machine and spraying the coating agent onto rolling fertilizer granules. When the coating agent provided by the invention is used, a polymer microspore film can be formed on the surfaceof the granular fertilizer. In a fertilizer application process, the release rate of nutrients is slowed through natural temperature difference, humidity difference and coating internal and external concentration difference, and the sustained release effect is obvious. Meanwhile, the production process is simple, the application range of the coating agent is wide, the cost of the coating agent islow and the coating agent can be promoted easily.

Description

technical field [0001] The invention relates to a preparation method of a slow-release fertilizer coating agent, belonging to the technical field of slow-release fertilizers. Background technique [0002] Slow-release fertilizers have the advantages of reducing the frequency of fertilization, improving fertilizer utilization, and reducing the production cost of agriculture and forestry. At present, the coated slow-release fertilizers that appear in China mainly include inorganic mineral coatings, sulfur coatings, and polyolefin resin coatings. . For example: Japanese patent (publication: PCT / JP2003 / 000840) discloses a method for preparing a fertilizer coated with polyolefin or ethylene and vinyl acetate copolymer. The Chinese patent discloses a copolymer of alkyd resin and unsaturated oil (publication number: 200810108192.2), starch (publication number: 201010294857.0), sulfur powder (publication number: 200410024050.X, 200810137704.8), polylactic acid (publication number: ...

Claims

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Application Information

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IPC IPC(8): C08G18/66C08G18/48C08G18/42C05G3/00
Inventor 卢玉栋柯金炼吴宗华蒲宗华刘建霞黎燕雄
Owner FUJIAN NORMAL UNIV
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