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Membrane wrapping sustained-release urea and producing method thereof

A slow-release urea and coating technology, applied in the field of plant nutrients, can solve the problems of limited slow-release effect, poor slow-release effect, and inability to form a waterproof surface coating, etc.

Inactive Publication Date: 2009-02-04
杨晓玲 +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention provides effective protein, but the slow-release effect is very limited. The slow-release agent used has no surface reaction with urea, and cannot form a waterproof surface coating. Therefore, the slow-release effect is not good

Method used

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  • Membrane wrapping sustained-release urea and producing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Embodiment 1: a kind of method for preparing coated-type slow-release urea, comprises following processing step:

[0044] A) Use granular urea with a particle size of ￠2.4-4mm, and dry it at 60-80°C for about 40 minutes;

[0045] B) Uniformly coat liquid polyisocyanate on the surface of flowing granular urea, the molar mass of polyisocyanate used is 5 times of the required molar mass to react with the surface of granular urea, and the coating time is 3 minutes, so that the polyisocyanate is mixed with urea on the surface of granular urea The reaction produces biuret;

[0046] C) At 40-60°C, evenly coat the mixed liquid consisting of double bond-containing polyols, oil substances, initiators, catalysts, and solvents on the surface of granular urea for 5 minutes, so that the double-bond-containing The bonded polyol reacts with the remaining polyisocyanate on the surface of the granular urea to generate polyurethane, while the double bond-containing polyol and oily substa...

Embodiment 2

[0056] A method for preparing coated sustained-release urea, comprising the following process steps:

[0057] A) Use granular urea with a particle size of ￠2.4-4mm, and dry it at 80-1000°C for about 10 minutes;

[0058] B) Liquid polyisocyanate is evenly coated on the surface of the flowing granular urea, the molar mass of the polyisocyanate used is 10 times that required for the reaction with the surface of the granular urea, and the coating time is 10 minutes, so that the polyisocyanate is on the surface of the granular urea and urea The reaction produces biuret;

[0059] C) At 80-100°C, uniformly coat the mixed liquid consisting of double bond-containing polyols, oil substances, initiators, catalysts, and solvents on the surface of granular urea, and the coating time is 10 minutes. The bonded polyol reacts with the remaining polyisocyanate on the surface of the granular urea to generate polyurethane, while the double bond-containing polyol and oily substances are polymeriz...

Embodiment 3

[0071] A method for preparing coated sustained-release urea, comprising the following process steps:

[0072] A) Use granular urea with a particle size of ￠2.4-4mm, and dry it at 70-90°C for about 30 minutes;

[0073] B) Evenly coat liquid isocyanate on the surface of flowing granular urea, the molar amount of liquid polyisocyanate used is 8 times of the molar amount needed to react with the surface of granular urea, and the coating time is 7 minutes, so that polyisocyanate is on the surface of granular urea and urea The reaction produces biuret;

[0074] C) At 70-90°C, uniformly coat the mixed liquid consisting of double bond-containing polyols, oil substances, initiators, catalysts, and solvents on the surface of granular urea, and the coating time is 8 minutes. The bonded polyol reacts with the remaining polyisocyanate on the surface of the granular urea to generate polyurethane, and simultaneously the polyol and oily substances polymerize to form a free radical polymer, w...

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Abstract

The invention discloses a slow-release urea and a preparation method thereof; the slow-release urea consists of a core layer and a coating layer; the core layer is granular urea while the coating layer has two layers; the inner layer is biuret and the outer layer comprises polyurethane and free radical polymer polymerized by polyol and oil substances with covalent bond and double bond. The slow-release urea is characterized by good slow-release effect and linear slow release, which is mainly used as a slow-release urea-based feed additive for animals and slow-release urea-based plant nutriment.

Description

technical field [0001] The invention relates to a slow-release urea capable of controlling the slow release of urea and a preparation method thereof, which is mainly used as a slow-release urea-based feed additive for animals and a slow-release urea-based plant nutrient. Background technique [0002] Granular urea is an excellent and economical source of nitrogen to stimulate plant growth. Unfortunately, urea dissolves quickly in water. For example, during the rainy season in spring, water-soluble phytonutrients are quickly washed away, thereby making (a) the effect of plant nutrients impoverishment, (b) may induce phytotoxicity to plants, and (c) cause nutrient migration and contamination of groundwater and local wells and rivers. [0003] Granular urea can also be used as a feed additive for ruminants such as cows, cattle, sheep, goats, etc. It is an excellent and economical source of non-protein nitrogen (NPN). The presence of microorganisms in the rumen or first stomach...

Claims

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Application Information

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IPC IPC(8): C05G3/08C05C9/00C05G3/90
Inventor 杨晓玲廖文张丽英罗石
Owner 杨晓玲
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