Interpenetrating network polymer polyurea/polyurethane resin coated controlled release fertilizer and production method thereof

A technology of polyurethane resin and interpenetrating network, which is applied in layered/coated fertilizers, fertilizer mixtures, fertilization devices, etc., can solve the problems of unsatisfactory nutrient release effect and poor wear resistance, and achieve sustainable development, Ease of degradability, effect of reducing dependence

Inactive Publication Date: 2018-09-07
SHANDONG AGRICULTURAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the coated controlled-release fertilizer has poor w

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0019] Example 1:

[0020] Put 500g of large granular urea with a diameter of 2-5mm into a rotating drum and heat it to 60-90℃; then 3.20g of molten liquid urea is reacted with 3.23g of curing agent p-phenylene diisocyanate to form polyurea prepolymer, Then mixed with 1.86g polyether polyol 204 and 0.80g curing agent p-phenylene diisocyanate and sprayed on the surface of urea particles quickly. After 6-9 minutes, the surface of the fertilizer can be directly cured and reacted to form a film. This process is repeated 3 times. The fertilizer can be packaged and stored after cooling. The obtained controlled-release fertilizer membrane material accounts for about 5% of the total weight of all controlled-release fertilizers, the initial dissolution rate of the fertilizer in 25°C water is 2.2%, and the nutrient release period is about 70 days.

Example Embodiment

[0021] Example 2:

[0022] Put 500g of large granular urea with a diameter of 2-5mm into the drum and heat it to 60-90℃; then 3.45g of molten liquid urea is reacted with 3.03g of curing agent polymethylene polyphenyl isocyanate to form polyurea The prepolymer is mixed with 2.06g diethylene glycol and 1.02g curing agent polymethylene polyphenyl isocyanate and sprayed quickly on the surface of urea particles. After 6-9 minutes, it can be directly cured and reacted on the surface of the fertilizer to form a film , This process is repeated 3 times. The fertilizer can be packaged and stored after cooling. The obtained controlled-release fertilizer membrane material accounts for about 5% of the total weight of all controlled-release fertilizers, the initial dissolution rate of the fertilizer in 25°C water is 2.5%, and the nutrient release period is about 70 days.

Example Embodiment

[0023] Example 3:

[0024] Put 500g of large granular urea with a diameter of 2-5mm into the drum and heat it to 60-90℃; then 3.32g of molten liquid urea is reacted with 3.10g of curing agent polymethylene polyphenyl isocyanate to form polyurea The prepolymer is mixed with 2.10g ethylene glycol and 0.97g curing agent polymethylene polyphenyl isocyanate and sprayed on the surface of urea particles quickly. After 6-9 minutes, it can be directly cured and reacted on the surface of the fertilizer to form a film. This process is repeated 4 times. The fertilizer can be packaged and stored after cooling. The obtained controlled-release fertilizer membrane material accounts for about 7% of the total weight of all controlled-release fertilizers, the initial dissolution rate of the fertilizer in 25°C water is 1.2%, and the nutrient release period is about 90 days.

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PUM

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Abstract

The invention relates to interpenetrating network polymer polyurea/polyurethane resin coated controlled release fertilizer and a production method thereof. Firstly, ordinary urea is heated to become amolten urea solution, the urea solution and a curing agent react to produce a polyurea prepolymer, the polyurea prepolymer is uniformly mixed with polyols and the curing agent, the mixture is directly sprayed to the surfaces of fertilizer particles for a curing reaction, films are formed, and the smooth and compact interpenetrating network polymer polyurea/polyurethane resin coated controlled release fertilizer with excellent water resistance can be obtained. The preparation cost is low, widely sourced urea and polyols are used as main raw materials, the controlled release fertilizer with different release cycles is prepared in combination with excellent properties of urea and polyols, and nutrient demands in each period of different crops can be met; a spray coating process is simple tooperate and does not require a solvent, curing is fast, the product production cost is low, and the interpenetrating network polymer polyurea/polyurethane resin coated controlled release fertilizer isvery suitable for large-scale industrial production and popularization and use in field crops.

Description

technical field [0001] The invention relates to an interpenetrating network polymer polyurea / polyurethane resin-coated controlled-release fertilizer and a production method thereof, belonging to the technical field of controlled-release fertilizer production. Background technique [0002] China is a large agricultural country, and its chemical fertilizer consumption accounts for about 30% of the world's total chemical fertilizer use, while the effective utilization rate of chemical fertilizers in my country is only 30-35% on average. Chemical fertilizer is one of the main resources of agricultural production, but the low utilization rate of fertilizer not only causes a huge waste of economic energy, but also brings serious environmental pollution problems. As a new type of fertilizer, coated controlled-release fertilizers can not only improve the utilization rate of fertilizers and reduce environmental pollution caused by chemical fertilizers, but also can be precisely contr...

Claims

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Application Information

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IPC IPC(8): C05G3/00C05G3/08C05G3/90
CPCC05G3/00C05G3/90C05G5/37
Inventor 陆盘芳贾聪张民
Owner SHANDONG AGRICULTURAL UNIVERSITY
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