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Coating sustained-release material, preparation method thereof and coated slow-release fertilizer prepared by using coating sustained-release material

A coating slow-release and fertilizer technology, which is applied in the direction of layered/coated fertilizers, phosphate fertilizers, fertilization devices, etc., can solve the problems of large environmental impact and high temperature requirements, and achieve process energy saving, good slow-release performance, and extended The effect of the industrial chain

Inactive Publication Date: 2018-07-10
WUHAN INSTITUTE OF TECHNOLOGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the prior art, a non-degradable cover agent needs to be used when preparing the coating material by using silica, a by-product of wet-process phosphoric acid, which has a greater impact on the environment, and the reaction has higher requirements on temperature.

Method used

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  • Coating sustained-release material, preparation method thereof and coated slow-release fertilizer prepared by using coating sustained-release material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A kind of preparation of coated slow-release material, concrete steps are as follows:

[0036] 1) Fully stir 40g of polyethylene glycol solution with a mass concentration of 2.5% and 3g of vinyl acetate-ethylene copolymer emulsion (Guangxi Guangwei GW-705) to completely dissolve the vinyl acetate-ethylene copolymer emulsion;

[0037] 2) Add 0.2 g of carboxymethylcellulose sodium salt to the solution obtained in step 1) and stir fully to dissolve it completely;

[0038] 3) Add 0.8 g of glycerol to the solution obtained in step 2), and stir and mix for 15 min at a stirring speed of 950 rpm;

[0039] 4) Add 5 g of silicon dioxide and 0.1 g of aluminum phosphate to the solution obtained in step 3), and stir at a stirring speed of 950 rpm for 35 min to obtain a coating liquid, namely a coating slow-release material.

[0040] The coated slow-release material prepared in this embodiment is used to prepare coated slow-release fertilizer, and the specific steps are as follows: ...

Embodiment 2

[0046] A kind of preparation of coated slow-release material, concrete steps are as follows:

[0047] 1) Fully stir 40g of polyethylene glycol solution with a mass concentration of 5% and 2g of vinyl acetate-ethylene copolymer emulsion (Guangxi Guangwei GW-705) to completely dissolve the vinyl acetate-ethylene copolymer emulsion,

[0048] 2) Add 0.4 g of carboxymethylcellulose sodium salt to the solution obtained in step 1) and stir well to completely dissolve it.

[0049] 3) Add 0.5 g of glycerol and 0.1 g of ethylene glycol to the solution obtained in step 2) and stir and mix for 15 min at a stirring speed of 894 rpm,

[0050] 4) Add 3 g of silicon dioxide and 0.2 g of aluminum phosphate to the solution obtained in step 3) and stir at a stirring speed of 894 rpm for 35 min to obtain a coating solution.

[0051] The coated slow-release material prepared in this embodiment is used to prepare coated slow-release fertilizer, and the specific steps are as follows:

[0052] Select...

Embodiment 3

[0054] A kind of preparation of coated slow-release material, concrete steps are as follows:

[0055] 1) Fully stir 40g of polyethylene glycol solution with a mass concentration of 7.5% and 1g of vinyl acetate-ethylene copolymer emulsion (Guangxi Guangwei GW-705) to completely dissolve the vinyl acetate-ethylene copolymer emulsion,

[0056] 2) Add 0.6 g of carboxymethylcellulose sodium salt to the solution obtained in step 1) and stir well to completely dissolve it.

[0057] 3) Add 0.4 g of glycerol to the solution obtained in step 2) and stir and mix for 15 min at a stirring speed of 1012 rpm,

[0058] 4) Add 4 g of silicon dioxide and 0.3 g of aluminum phosphate to the solution obtained in step 3) and stir at a stirring speed of 1012 rpm for 35 min to obtain a coating solution.

[0059] The coated slow-release material prepared in this embodiment is used to prepare coated slow-release fertilizer, and the specific steps are as follows:

[0060] Select 5g of diammonium phosp...

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Abstract

The invention discloses a coating sustained-release material, a preparation method thereof and a coated slow-release fertilizer prepared by using the coating sustained-release material. The coating sustained-release material is prepared by the follow steps: blending polyethylene glycol and a vinyl acetate-ethylene copolymer emulsion, adding active silica which is a by-product generated in preparing potassium fluoride by using wet-process phosphoric acid defluorination, carboxymethyl cellulose sodium salt, glycerol or ethylene glycol, and aluminum phosphate, and carrying out blending for modification. The coating sustained-release material has certain biodegradability and is environmentally friendly. A coating liquid provided by the invention is atomized and sprayed on the surface of a diammonium phosphate granular fertilizer for a plurality of times by using a high-pressure spray gun, and drying is carried out by hot air for obtaining the coated slow-release fertilizer. The nutrients of the coated slow-release fertilizer provided by the invention can be slowly dissolved out, so that the utilization rate of the fertilizer can be improved, sustainable development of agriculture is facilitated, meanwhile the extension of the industrial chain of development and utilization of phosphorite resources is also facilitated, and the by-products generated in preparing potassium fluoride byusing wet-process phosphoric acid defluorination are effectively utilized.

Description

technical field [0001] The invention relates to a film-coated slow-release material, a preparation method thereof and a film-coated slow-release fertilizer prepared therefrom, belonging to the field of film-coated fertilizers. Background technique [0002] Slow-release fertilizer refers to a kind of fertilizer whose nutrient release rate is very slow, can be released for a long time, and can play a role in the entire cycle of crop growth. [0003] According to the data released by the Ministry of Agriculture in December 2015, the fertilizer utilization rate of my country's three major grain crops of rice, corn and wheat is 35.2%, which is 2.2 percentage points higher than that in 2013. The U.S. grain crop nitrogen utilization rate is roughly 50%, and the grain crop utilization rate in major European countries is roughly 65%, which is 15 to 30 percentage points higher than that of my country. In contrast, my country's fertilizer utilization rate is still low, and there is st...

Claims

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Application Information

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IPC IPC(8): C05G3/00
CPCC05B7/00C05G3/00C05G5/30C05G5/37
Inventor 丁一刚王宁龙秉文邓伏礼刘生鹏张逸戴亚芬何俊
Owner WUHAN INSTITUTE OF TECHNOLOGY
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