Urethane resin-coated controlled release fertilizer

A technology of polyurethane resin and coated controlled-release fertilizer, which is applied in fertilization devices, fertilizer mixtures, applications, etc., can solve the problems of scientific fertilization technology, low education level, low mechanization degree, etc., and achieve significant increase in production and synergy , Extensive promotion and application prospects, and the effect of reducing the loss rate of raw materials

Active Publication Date: 2012-08-29
KINGENTA ECOLOGICAL ENG GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

One of the reasons why my country's fertilizer utilization rate is lower than that of developed countries is that the series of scientific fertilization techniques adopted in developed countries are difficult to work in China
The education level of farmers in our country is low, the land area of ​​farmers is small and scattered, the planting system is complex, the degree of mechanization is low, the agrochemical service system is difficult to establish and in place, and it is difficult to provide convenient services for farmers with formula fertilization and other technical measures; farmers are no longer willing to spend too much time and energy on agronomic operations such as topdressing

Method used

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  • Urethane resin-coated controlled release fertilizer
  • Urethane resin-coated controlled release fertilizer
  • Urethane resin-coated controlled release fertilizer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1 Production of controlled release period 2 months polyurethane controlled release urea (44-0-0)

[0019] Weigh 13.5kg of polymeric MDI, 3kg of industrial paraffin oil, 12kg of tung oil and 1.5kg of light calcium carbonate, add them to 3kg of xylene and stir evenly, configure the coating solution, and put 1000kg of large particle urea (2.0-4.75mm) in the spray In the fluidized bed, the hot air is used to preheat to 45-48°C, and the hot gas is used in the coating equipment. The coating liquid is sprayed on the surface of the suspended and fluidized urea particles through the nozzle. Under the action of the hot air, The solvent evaporates quickly, and the coating material is wrapped on the surface of the fertilizer particles to form a dry, smooth and dense film layer. After continuous spraying of the coating solution, polyurethane with a coating rate of about 3% and a controlled release period of 2 months is obtained until the coating process is completed. Cont...

Embodiment 2

[0020] The making of embodiment 2 controlled release period 4 months polyurethane controlled release compound fertilizer (14-14-14)

[0021] Weigh 23.8kg of polymeric MDI, 4.76kg of industrial paraffin oil, 19kg of tung oil and 2.38kg of light calcium carbonate, add them in turn to 7.5kg of xylene and stir evenly. In the sprayed fluidized bed, hot air is used to preheat to 48-52°C, and in the coating equipment, hot gas is used to set off, and the coating liquid is sprayed onto the surface of the suspended and fluidized urea particles through the nozzle, and the hot air Under the environment, the solvent evaporates quickly, and the coating material is wrapped on the surface of the fertilizer particles to form a dry, smooth and dense film layer. After continuous spraying of the coating solution, the coating rate is about 5% until the coating process is completed. The controlled release period is 4 months. Polyurethane controlled-release compound fertilizer (14-14-14), the volati...

Embodiment 3

[0022] The making of embodiment 3 controlled-release period 9 months polyurethane controlled-release compound fertilizer (20-8-10)

[0023] Weigh 38.5kg of polymeric MDI, 7kg of industrial paraffin oil, 28kg of tung oil and 3.5kg of light calcium carbonate, add them to 15.4kg of xylene and stir evenly, configure the coating solution, and put 1000kg of granular compound fertilizer (2.0-4.75mm) in the In the spouted fluidized bed, hot air is used to preheat to 52-57°C, and in the coating equipment, hot gas is used to set off the coating liquid. , the solvent evaporates quickly, and the coating material is wrapped on the surface of the fertilizer particles to form a dry, smooth and dense film layer. After continuous spraying of the coating solution, until the coating process is completed, the coating rate is about 7% and the controlled release period is 9 months. Polyurethane controlled-release compound fertilizer (20-8-10), the volatilized solvent can be recovered and recycled. ...

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Abstract

The invention discloses a urethane resin-coated controlled release fertilizer. The particle size range of the urethane resin-coated controlled release fertilizer is between 2.0 and 5.0mm, the coating rate is between2 and 9 percent, the nutrient release period is 1 to 12 months, and the preparation method comprises the following steps: weighing solute; adding the solute to dimethylbenzene; stirring the solute and the dimethylbenzene uniformly; preparing coating solution; spraying the coating solution on the surface of a granulated fertilizer in a fluidized bed; volatilizing the dimethylbenzene; and solidifying the solute on the surface of the granulated fertilizer to form a film until finishing the process of coating to obtain the urethane resin-coated controlled release fertilizer. The product has the characteristics of very good controlled release property and good popularization prospect.

Description

technical field [0001] The invention belongs to the field of chemical products, and in particular relates to a polyurethane resin-coated controlled-release fertilizer product. Background technique [0002] my country's chemical fertilizer consumption accounts for about 20-30% of the world's total chemical fertilizer consumption, ranking first in the world. The average seasonal utilization rate of chemical fertilizers in developed countries is 50-60%, and the average seasonal utilization rate of chemical fertilizers in my country is only 30-35%. . The loss and waste of a large number of nutrients not only bring huge economic losses to the society, but also cause serious environmental pollution. At present, with the continuous increase in the amount of chemical fertilizers, the modification of fertilizers is even more important under the multiple goals of pursuing both yield and quality of agricultural products and environmental friendliness. Developing slow-release and contr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05G3/00
Inventor 解玉洪陈剑秋范玲超李广涛
Owner KINGENTA ECOLOGICAL ENG GRP
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