Preparation of castor oil-based coating material and application of castor oil-based coating material in controlled-release fertilizers

A technology of coating materials and coated controlled-release fertilizers, which is applied in the field of slow-release fertilizers, can solve problems such as difficult product separation, high catalyst prices, and unfavorable recycling, and achieve good chemical stability, high reactivity, and precise nutrients. The effect of controlled release

Inactive Publication Date: 2016-10-26
KINGENTA ECOLOGICAL ENG GRP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Commonly used acid catalysts such as inorganic acids, organic acids and acidified clays are mostly homogeneous catalysts. Although the reactivity is high, the price of the catalyst is high and it is difficult to separate from the product, which is not conducive to recycling.

Method used

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  • Preparation of castor oil-based coating material and application of castor oil-based coating material in controlled-release fertilizers
  • Preparation of castor oil-based coating material and application of castor oil-based coating material in controlled-release fertilizers
  • Preparation of castor oil-based coating material and application of castor oil-based coating material in controlled-release fertilizers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] 1. Preparation of coating material based on modified castor oil

[0055] (1) In parts by weight, add 70 parts of castor oil, 7 parts of formic acid, and 0.3 parts of concentrated phosphoric acid (85wt%) into a three-necked flask, keep the temperature in the water bath at 40°C, slowly add 22.7 parts of 30wt% hydrogen peroxide solution dropwise, and the hydrogen peroxide is added dropwise Afterwards, it was raised to 60°C, and after constant temperature reaction for 4 hours, the water phase was removed by liquid separation to obtain a crude product. The crude product was washed with 1wt% sodium hydroxide aqueous solution until pH = 7, and finally the washed material was vacuum-treated at 80°C. Distillation and dehydration under reduced pressure for 1.5h at a temperature of 0.09-0.1MPa to obtain epoxy castor oil.

[0056] According to GB / T1677-2008 standard, the epoxy value of epoxy castor oil is 3.25%.

[0057] According to the GB / T 5532-2008 standard, the iodine value o...

Embodiment 2

[0065] 1. Preparation of coating material based on modified castor oil

[0066] (1) In parts by weight, add 70 parts of castor oil, 7 parts of formic acid, and 0.3 parts of concentrated phosphoric acid (85wt%) into a three-necked flask, keep the temperature in the water bath at 40°C, slowly add 22.7 parts of 30wt% hydrogen peroxide solution dropwise, and the hydrogen peroxide is added dropwise Afterwards, it was raised to 60°C, and after constant temperature reaction for 4 hours, the water phase was removed by liquid separation to obtain a crude product. The crude product was washed with 1wt% sodium hydroxide aqueous solution until pH = 7, and finally the washed material was vacuum-treated at 80°C. Distillation and dehydration under reduced pressure for 1.5h at a temperature of 0.09-0.1MPa to obtain epoxy castor oil.

[0067] According to GB / T1677-2008 standard, the epoxy value of epoxy castor oil is 3.25%.

[0068] According to GB / T 5532-2008 standard, the iodine value of ep...

Embodiment 3

[0076] 1. Preparation of coating material based on modified castor oil

[0077] (1) In parts by weight, add 70 parts of castor oil, 7 parts of formic acid, and 0.3 parts of concentrated phosphoric acid (85wt%) into a three-necked flask, keep the temperature in the water bath at 40°C, slowly add 22.7 parts of 30wt% hydrogen peroxide solution dropwise, and the hydrogen peroxide is added dropwise Afterwards, it was raised to 60°C, and after constant temperature reaction for 4 hours, the water phase was removed by liquid separation to obtain a crude product. The crude product was washed with 1wt% sodium hydroxide aqueous solution until pH = 7, and finally the washed material was vacuum-treated at 80°C. Distillation and dehydration under reduced pressure for 1.5h at a temperature of 0.09-0.1MPa to obtain epoxy castor oil.

[0078] According to GB / T1677-2008 standard, the epoxy value of epoxy castor oil is 3.25%.

[0079] According to GB / T 5532-2008 standard, the iodine value of ep...

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Abstract

The invention relates preparation of castor oil-based coating material and application of the castor oil-based coating material in controlled-release fertilizers. Epoxidized castor oil is prepared from castor oil as a raw material by using a non-solvent method under acid catalysis by using small-molecular carboxylic acid and hydrogen peroxide as modifiers; then, small-molecular alcohols and alcohol amines are used as ring-opening reagents to prepare the modified castor oil coating material 200-400 mgKOH/g in hydroxyl value under the action of a solid acid catalyst. The modified castor oil coating material and isocyanate are used as component A and component B respectively to prepare a modified castor oil coated controlled-release fertilizer by using non-solvent in-situ reaction coating technology. The controlled-release fertilizer is green, the production process of the fertilizer is simple, the controlled release effect is good and stable, and controlled-release fertilizers with different release periods may be prepared by changing coating amount.

Description

technical field [0001] The invention relates to the preparation of a modified castor oil-based coating material and its application in controlled-release fertilizers, belonging to the technical field of slow-controlled release fertilizers. Background technique [0002] Controlled-release fertilizer coating technology has been developed for three generations. The first generation is coated with solvent-based thermoplastic resin, which requires solvents in the production process and the process is not environmentally friendly; Low content; the third generation is solvent-free ultra-thin coating technology, represented by Canadian Agrium coating technology. The coating technology has the advantages of simple production process, environmental protection, and low coating volume. It has become a research hotspot for domestic and foreign controlled-release fertilizer manufacturers and university scholars. [0003] Castor oil, obtained from castor beans, is a viscous, light yellow,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00C08G18/67
CPCC05G5/30C08G18/36
Inventor 陈宏坤严加安张强陈剑秋任士伟
Owner KINGENTA ECOLOGICAL ENG GRP
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