Modified heat convertible resin coating urea

A resin-coated and coated urea technology, which is applied to urea compound fertilizers, nitrogen fertilizers, and fertilizer mixtures, can solve the problems of unfavorable promotion and application of thermosetting controlled-release fertilizers, slow resin degradation speed, and high prices of controlled-release fertilizers. Effects of soil security, yield increase and synergistic effects, broad market development prospects

Active Publication Date: 2009-02-18
KINGENTA ECOLOGICAL ENG GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Fully using thermosetting resin coating to make controlled-release fertilizer, on the one hand, the production cost is high, which makes the price of controlled-release fertilizer higher, which is not conducive to the popularization and application of thermosetting controlled-release fertilizer; It has a certain impact on soil organisms, so it is necessary to take effective measures to accelerate the degradation of the residual film of controlled-release fertilizers

Method used

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  • Modified heat convertible resin coating urea
  • Modified heat convertible resin coating urea
  • Modified heat convertible resin coating urea

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Example 1. Production of modified thermosetting resin-coated urea with a controlled release period of 2 months.

[0033] 1) Mix 18kg of thermosetting bisphenol A epoxy resin and 1.62kg of epoxy resin curing agent T-31 (manufactured and sold by Tianjin Yanhai Chemical Co., Ltd.), and add 5kg of coating modifier (including 3kg of sweet potato powder , rubber powder 1kg, bone powder 1kg), prepare the mixed solution;

[0034] 2) Preheat 1000kg of granular urea with a particle size range of 1.0-5.0mm to 75°C in a granulator;

[0035] 3) Add the mixed solution described in step 1) to the granular urea in the granulator, keep the temperature, and make the granulator continue to run for 5 minutes, that is, the coating is uniform and solidified to form a film; the coating rate is 2.5 %, modified thermosetting coated urea with a controlled release period of 2 months.

Embodiment 2

[0036] Example 2. Production of modified thermosetting resin-coated urea with a controlled release period of 10 months.

[0037] 1) Mix 21kg of thermosetting bisphenol A epoxy resin and 2.1kg of diethylenetriamine evenly, add 20kg of coating modifier (containing 16kg of mineral powder, 3kg of rubber powder, and 1kg of wheat flour), and prepare a mixed solution;

[0038] 2) Preheat 1000kg granular urea to 80°C in a granulator;

[0039] 3) Add the mixed solution described in step 1) to the granular urea in the granulator, keep the temperature, and keep the granulator running for 3 minutes, that is, the coating is uniform and solidified to form a film;

[0040] Repeat step 3) twice to obtain a modified thermosetting coated urea with a coating ratio of about 13% and a controlled release period of 10 months.

Embodiment 3

[0041] Example 3. Production of modified thermosetting resin-coated urea with a controlled release period of 12 months. .

[0042]1) Mix 23kg of thermosetting bisphenol A epoxy resin and 2.76kg of triethylenetetramine evenly, add 30kg of coating modifier (including 22kg of sweet potato powder, 3kg of zeolite powder, and 5kg of diatomaceous earth) to prepare a mixed solution ;

[0043] 2) Preheat 1000kg granular urea to 75°C in a granulator;

[0044] 3) Add the mixed solution described in step 1) to the granular urea in the granulator, keep the temperature, and make the granulator continue to run for 4 minutes, that is, evenly coat and solidify to form a film;

[0045] Repeat step 3) twice to obtain a modified thermosetting coated urea with a coating rate of about 17% and a controlled release period of 12 months.

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Abstract

The invention discloses a modified thermosetting resin coated urea, comprising a urea core and a thermosetting resin coat. The total coating rate is from 2 percent wt to 17 percent wt. Nutrient release period is from 1 to 12 months. The manufacture method has the following steps: (1) mixing bisphenol A epoxy resin and curing agent thereof evenly; adding coat modifier and preparing mixed liquid; (2) preheating grain urea in a granulator; (3) adding the mixed liquid onto the grain urea in the granulator; keeping temperature; making the granulator go on running; coating evenly; solidifying to a coat and obtaining the modified thermosetting coated urea. The controlled release fertilizer has good output increasing effect and controlled release performance, which has great popularization value.

Description

technical field [0001] The invention belongs to the field of chemical products, in particular to a modified thermosetting resin-coated urea product. Background technique [0002] my country's fertilizer consumption accounts for about 20-30% of the world's total 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 controlled-release fertilizers to improve fertiliz...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/08C05C9/00C05G3/90
Inventor 张民解玉洪颜明宵
Owner KINGENTA ECOLOGICAL ENG GRP
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