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Controlled release fertilizer coated by vegetable oil based polyurethane and preparation method thereof

A vegetable oil-based, controlled-release fertilizer technology, applied in fertilizer mixtures, fertilization devices, applications, etc., can solve the problems of low continuous level, non-degradable membrane materials, and high production costs, and achieve simple film forming process, excellent mechanical properties, The effect of high adhesion

Inactive Publication Date: 2013-09-18
上海永通生态工程股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In my country, the coating-type controlled-release fertilizer prepared by dissolving polymer materials, such as polyolefin materials, etc. in an organic solvent, and then spraying coated fertilizer particles is relatively mature, but the production cost is too high and the level of continuity is relatively low. Low, the use of organic solvents in the production process pollutes the environment, and the membrane material is not easy to degrade, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Step 1), weigh 1 kg of 15-15-15 compound fertilizer particles with a particle size of 3mm-4mm, place them in the coating machine, turn on the coating machine to preheat the fertilizer particles until the temperature of the fertilizer particles reaches 70 ℃ and maintain.

[0031] Step 2), weigh 18.9g of castor oil, add 1.7g of glycerin, 1.08g of microcrystalline paraffin; weigh 16.3g of polymethylene polyphenyl polyisocyanate, add 2g of diethylene glycol dibenzoate; heat separately . After the microcrystalline paraffin is completely melted, the two are mixed and stirred evenly to form a vegetable oil-based polyurethane coating liquid.

[0032] Step 3), slowly pour the uniformly stirred and mixed vegetable oil-based polyurethane coating solution prepared in step 2) onto the surface of the preheated fertilizer particles in step 1), continue to heat and keep warm for in-situ polymerization reaction, about 5-6 minutes Finally, turn off the heating function, and let the fer...

Embodiment 2

[0036] Step 1) Weigh 1 kg of 15-15-15 compound fertilizer particles with a particle size of 3mm-4mm, place them in the coating machine, turn on the coating machine to preheat the fertilizer until the temperature of the fertilizer particles reaches 75°C And kept.

[0037] Step 2), weigh 19.75g of soybean oil, add 1.78g of glycerin, 1.13g of microcrystalline paraffin; weigh 15.34g of polymethylene polyphenyl polyisocyanate, add 2g of diethylene glycol dibenzoate; heat separately . After the microcrystalline paraffin is completely melted, the two are mixed and stirred evenly to form a vegetable oil-based polyurethane coating liquid.

[0038] Step 3), slowly pour the uniformly stirred and mixed vegetable oil-based polyurethane coating solution prepared in step 2) onto the surface of the preheated fertilizer particles in step 1), continue to heat and keep warm for in-situ polymerization reaction, about 5-6 minutes Finally, turn off the heating function, and let the fertilizer gra...

Embodiment 3

[0042] Step 1), weigh 1 kg of 15-15-15 compound fertilizer particles with a particle size of 3mm-4mm, put it in the coating machine, turn on the coating machine to preheat the fertilizer until the temperature of the fertilizer particles reaches 80 °C And kept.

[0043] Step 2): Weigh 23.5g of peanut oil, add 0.52g of glycerin, and 1.3g of microcrystalline paraffin; weigh 12.67g of polymethylene polyphenyl polyisocyanate, add 2g of diethylene glycol dibenzoate; heat respectively. After the microcrystalline paraffin is completely melted, the two are mixed and stirred evenly to form a vegetable oil-based polyurethane coating solution.

[0044] Step 3), slowly pour the uniformly stirred and mixed vegetable oil-based polyurethane coating solution prepared in step 2) onto the surface of the preheated fertilizer particles in step 1), continue to heat and keep warm for in-situ polymerization reaction, about 5-6 minutes Finally, turn off the heating function, and let the fertilizer gr...

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Abstract

The invention discloses a controlled release fertilizer coated by vegetable oil based polyurethane and a preparation method thereof. The preparation method of the controlled release fertilizer coated by vegetable oil based polyurethane comprises the following steps of: 1) preheating the granular fertilizer; 2) heating plant oil polyhydric alcohol containing 2-6 hydroxys and isocyanate containing at least two isocyanate groups, and uniformly mixing the ingredients to form a vegetable oil based polyurethane coating liquid; 3) spray coating the vegetable oil based polyurethane coating liquid on the surfaces of the preheated fertilizer granules, repeatedly spray coating the vegetable oil based polyurethane coating liquid for 2-10 times after the vegetable oil based polyurethane coating liquid solid is solidified to obtain the controlled release fertilizer coated by vegetable oil based polyurethane. According to the controlled release fertilizer coated by vegetable oil based polyurethane and the preparation method thereof provided by the invention, the adopted coating material is extensive in resource, cheap and liable to obtain, non-toxic, harmless, simple in production process and good in controlled release effect of fertilizer.

Description

technical field [0001] The invention relates to a coating material, a coating controlled-release fertilizer and a preparation method thereof, in particular to a vegetable oil-based polyurethane coating, a controlled-release fertilizer and a preparation method thereof. Background technique [0002] Fertilizers, especially chemical fertilizers, are a source of nutrients necessary for crop growth. my country's chemical fertilizer consumption accounts for about 20%-30% of the world's total chemical fertilizer consumption, ranking first in the world, but the average utilization rate of chemical fertilizers in the current season is only 30%-35%. The waste and loss of a large amount of fertilizer not only brings huge economic losses to the society, but also brings serious environmental pollution. At present, with the continuous increase in the amount of chemical fertilizers, the continuous strengthening of people's awareness of environmental protection, and the pursuit of multiple...

Claims

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Application Information

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IPC IPC(8): C08G18/76C08G18/36C08L75/04C05G3/00
Inventor 石称华钱志红季本洋
Owner 上海永通生态工程股份有限公司
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