Composite modified polyurethane coating slurry, controlled release fertilizer and preparation method of controlled release fertilizer

A compound modification and controlled-release fertilizer technology, which is applied in the direction of urea compound fertilizer, layered/coated fertilizer, alkaline orthophosphate fertilizer, etc., can solve the problems of difficult degradation of membrane materials, low continuous level, high production cost, etc. , to achieve the effect of facilitating degradation, simple film forming process, and reduced coating cost

Active Publication Date: 2017-06-06
上海永通生态工程股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In my country, the coating-type controlled-release fertilizer prepared by dissolving polymer materials, such as polyolefin materials, etc. in an organic solvent, and then spraying coating fertilizer particles is relatively mature, but the production cost is too high and the level of continuity is relatively low. Low, the use of organic solvents in the production process pollutes the environment, membrane materials are not easy to degrade, etc.

Method used

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  • Composite modified polyurethane coating slurry, controlled release fertilizer and preparation method of controlled release fertilizer
  • Composite modified polyurethane coating slurry, controlled release fertilizer and preparation method of controlled release fertilizer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Weigh 24.50 g of castor oil and 7.00 g of attapulgite in advance, add them into a small beaker and mix them evenly with a magnetic stirrer to obtain component A. (2) Weigh 16.60 g of polymethylene polyphenyl polyisocyanate and 3.80 g of cardanol in advance, heat up to 75° C., and react for 2 hours to obtain polymethylene polyphenyl polyisocyanate modified by cardanol, Obtain the B component. (3) After mixing the above-mentioned components A and B evenly, the vegetable oil-based attapulgite hybrid composite modified polyurethane coating liquid is obtained; (4) Weigh 15-15-15 1000g of compound fertilizer granules are placed in a coating machine, and the coating machine is turned on to preheat the fertilizer granules until the temperature of the fertilizer granules reaches 70°C; (5) the vegetable oil-based attapulgite prepared in step (3) is mixed with Chemical composite modified polyurethane coated slurry spraying on the surface of the 15-15-15 composite fertilizer p...

Embodiment 2

[0030](1) Weigh 18.40 g of castor oil and 5.50 g of attapulgite in advance, add them into a small beaker and mix them evenly with a magnetic stirrer to obtain component A. (2) Weigh 8.10 g of polymethylene polyphenyl polyisocyanate and 1.54 g of cardanol in advance, heat up to 78° C., and react for 2 hours to prepare polymethylene polyphenyl polyisocyanate modified by cardanol, Obtain the B component. (3) After mixing the above-mentioned components A and B evenly, the vegetable oil-based attapulgite hybrid composite modified polyurethane coating liquid is obtained; (4) Weigh 15-15-15 1000g of compound fertilizer granules are placed in a coating machine, and the coating machine is turned on to preheat the fertilizer granules until the temperature of the fertilizer granules reaches 65°C; (5) the vegetable oil-based attapulgite prepared in step (3) is mixed with Chemical composite modified polyurethane coated slurry spraying on the surface of the 15-15-15 composite fertilizer pa...

Embodiment 3

[0033] (1) Weigh 18.40 g of soybean oil and 4.80 g of attapulgite in advance, add them into a small beaker and mix them evenly with a magnetic stirrer to obtain component A. (2) Weigh 8.60 g of polymethylene polyphenyl polyisocyanate and 1.79 g of cardanol in advance, heat up to 80° C., and react for 2 hours to obtain polymethylene polyphenyl polyisocyanate modified by cardanol, Obtain the B component. (3) After mixing the above-mentioned components A and B evenly, the vegetable oil-based attapulgite hybrid composite modified polyurethane coating liquid is obtained; (4) Weigh 15-15-15 1000g of compound fertilizer granules are placed in a coating machine, and the coating machine is turned on to preheat the fertilizer granules until the temperature of the fertilizer granules reaches 70°C; (5) the vegetable oil-based attapulgite prepared in step (3) is mixed with Chemical composite modified polyurethane coated slurry spraying on the surface of the 15-15-15 composite fertilizer p...

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Abstract

The invention discloses composite modified polyurethane coating slurry, a controlled release fertilizer and a preparation method of the controlled release fertilizer. The preparation method of the polyurethane coating controlled release fertilizer comprises the following steps: (1) vegetable oil polyhydric alcohol and attapulgite are uniformly mixed at a preset ratio to obtain an A component; (2) polymethylene polyphenyl isocyanate and cardanol with a mole ratio of 10-15% react for 1-3h at 70-80 DEG C to obtain a B component; (3) the A component and the B component are uniformly mixed in proportion to obtain vegetable oil based attapulgite hybridized composite modified polyurethane coating slurry; (4) a to-be-coated granular fertilizer is preheated; (5) the composite modified polyurethane coating slurry is sprayed on the surface of the preheated granular fertilizer; (6) the vegetable oil based polyurethane coating slurry is repeatedly sprayed for 3-6 times after the vegetable oil based polyurethane coating slurry is solidified to obtain the vegetable oil based attapulgite hybridized composite modified polyurethane coating controlled release fertilizer.

Description

technical field [0001] The invention relates to a coating material, a coating controlled release fertilizer and a preparation method thereof, in particular to a vegetable oil base and attapulgite hybrid composite modified polyurethane coating liquid, a controlled release fertilizer and a preparation method thereof. Background technique [0002] As a new type of fertilizer, slow and controlled release fertilizer has attracted worldwide attention due to its unique advantages such as energy saving and environmental protection, high fertilizer utilization rate, increased production and efficiency, and labor and time saving. Slow and controlled release fertilizers mainly have three mechanisms to achieve the purpose of slow release: 1. Add nitrogen inhibitors; 2. Add formaldehyde urea; 3. Coat the fertilizer. Controlled-release fertilizer is an advanced form of slow-release fertilizer. Coated controlled-release fertilizer can control the release of all nutrients contained in ferti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00C05G5/00
CPCC05B7/00C05C1/00C05G5/30C05C3/00C05C5/02C05C9/00C05D1/02
Inventor 石称华钱志红连晓敏
Owner 上海永通生态工程股份有限公司
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