Slow releasing urea and its producing method

A technology of slow-release urea and its production method, which is applied in the direction of urea compound fertilizer, nitrogen fertilizer, fertilizer mixture, etc., and can solve the problems of not being used on a large scale, not matching the peak period of nitrogen absorption, and slow-release too fast.

Inactive Publication Date: 2006-01-04
JILIN AGRICULTURAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The main types of coated urea currently formed in China include coated urea, phosphogypsum coated urea and calcium magnesium phosphate coated urea. The amount is small and the cost is low, but most of its slow-release properties are too fast

Method used

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  • Slow releasing urea and its producing method
  • Slow releasing urea and its producing method
  • Slow releasing urea and its producing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0100] Sieve the qualified product granular urea produced by Daqing Petrochemical General Plant into the particle size of φ2.00~3.00mm, and leave 10kg after measuring with a platform scale; take 0.1kg of analytically pure polyvinyl acetate produced by Zhangjiang Fine Chemical Factory of Shanghai Sanwei Pharmaceutical Company, 0.4 kg of analytically pure methanol produced by Beijing Chemical Plant, adding polyvinyl acetate to methanol while stirring and heating to dissolve, the dissolution temperature is 120 ° C, measured with a platform scale after all the dissolution, and replenishing the volatilized methanol to the amount before volatilization is obtained Coating solution.

[0101] Put the above-mentioned granular urea in the coating pan, set the rotating speed of the coating pan to 200 rpm, and set the coating temperature to 60°C; at the same time, spray the above-mentioned coating solution to the granular urea in the coating pan intermittently with a spray gun. The gas pre...

Embodiment 2

[0103] Sieve the qualified product granular urea produced by Daqing Petrochemical General Plant into the particle size of φ2.00~3.00mm, and leave 10kg after measuring with a platform scale; take 0.31kg of analytically pure polyvinyl acetate produced by Zhangjiang Fine Chemical Factory of Shanghai Sanwei Pharmaceutical Company, 1.24kg of analytically pure methanol produced by Beijing Chemical Plant, adding polyvinyl acetate to methanol while stirring and heating to dissolve, the dissolution temperature is 150°C, measured with a platform scale after all the dissolution, and replenishing the volatilized methanol to the amount before volatilization is obtained Coating solution.

[0104] Put the above-mentioned granular urea in the coating pot, the speed of the coating pot is set to 200 rpm, and the coating temperature is set to 70°C; at the same time, the above-mentioned coating solution is intermittently sprayed on the granular urea in the coating pot with a spray gun. The gas pr...

Embodiment 3

[0106] Sieve the qualified product granular urea produced by Daqing Petrochemical General Plant into the particle size of φ2.00~3.00mm, and leave 10kg after measuring with a platform scale; take 0.2041kg of analytically pure polyvinyl acetate produced by Zhangjiang Fine Chemical Factory of Shanghai Sanwei Pharmaceutical Company, 0.8164kg of analytically pure methanol produced by Beijing Chemical Plant, adding polyvinyl acetate to methanol while stirring and heating to dissolve, the dissolution temperature is 135°C, measured with a platform scale after all the dissolution, and replenishing the volatilized methanol to the amount before volatilization is obtained Coating solution.

[0107] Put the above-mentioned granular urea in the coating pan, set the rotating speed of the coating pan to 200 rpm, and set the coating temperature to 65°C; at the same time, spray the above-mentioned coating solution to the granular urea in the coating pan intermittently with a spray gun. The gas ...

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Abstract

The slow releasing urea is produced with polyvinyl acetate as coating polymer material and granular urea in the weight ratio of 1-3.1 to 100, preferably 2.041 to 100. The production process includes the steps of: sieving granular urea to obtain urea with grain size of 2-3 mm, dissolving polyvinyl acetate in solvent to obtain coating solution, coating urea with the coating solution in the required weight ratio, stoving, sieving and packing. The present invention has proper thickness of coating to regulate nitrogen releasing rate and amount for synchronizing the growth period of crop. The present invention has the features of low cost, reduced pollution of nitrogen fertilizer on environment and agricultural product, etc.

Description

technical field [0001] The invention belongs to the technical field of fertilizers, in particular to a slow-release urea and a preparation method thereof. Background technique [0002] Nitrogen is generally deficient in farmland soil in my country, and the application of nitrogen fertilizer is one of the key measures to ensure high-yield, stable, high-quality, and efficient agriculture. At present, the main variety of nitrogen fertilizer in the world and in my country is urea. Urea has been recognized by consumers for its high concentration of effective nutrients, good performance, easy storage and transportation, and convenient use. However, urea is eventually hydrolyzed to CO after application by the action of soil urease 2 and NH 3 , under certain environmental conditions, such as rainfall and irrigation, it is easy to cause leaching and volatilization loss, so the nitrogen utilization rate is relatively low, the national average is only 36%. Jilin Province is the mai...

Claims

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Application Information

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IPC IPC(8): C05C9/00C05G3/08C05G3/90
CPCY02P60/21
Inventor 周米平王岩杨靖民刘世杰张大克于晓斌温思民马振江
Owner JILIN AGRICULTURAL UNIV
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