Blending modified silica emulsion coated diammonium phosphate slow-release compound fertilizer and preparation method thereof

A technology of coating diammonium phosphate and slow-release compound fertilizer, which can be used in fertilizer mixtures, fertilization devices, agriculture, etc., can solve the problems of poor elasticity, poor slow-release performance of fertilizers, and it is difficult to control and release nutrients. Convenient operation, efficient utilization, and the effect of industrialized operation

Active Publication Date: 2018-11-06
WUHAN INSTITUTE OF TECHNOLOGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] When the inorganic coating material is formed into a film, it has poor elasticity, brittleness, and poor slow-release performance of fertilizers, so it is difficult to realize the control and release of nutrients in the true sense.

Method used

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  • Blending modified silica emulsion coated diammonium phosphate slow-release compound fertilizer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Mix 40g of polyvinyl alcohol aqueous solution with a mass concentration of 4% and 0.35g of sodium carboxymethylcellulose in a water bath at a temperature of about 85°C and a stirring speed of 1075rpm until they are completely dissolved, and then add 0.04g of organic silicon Foaming agent and stir for about one minute, then add 0.7g of glycerol, stir and mix at high speed for 2 minutes, then add 6.1g of silica powder and stir and mix at high speed for about 30 minutes to prepare a blended modified silica emulsion, choose 2 ~ 4mm The diammonium phosphate granular fertilizer was preheated at 60°C for 4 minutes, and then the prepared blended modified silica emulsion was atomized and sprayed on its surface for many times, and the coated particles were subjected to hot air at 90°C. After drying and cooling at room temperature, the spray coating amount accounts for 36.48% of the total weight of the uncovered fertilizer, and finally spray paraffin wax solution on the surface, an...

Embodiment 2

[0027] Mix 40g of polyvinyl alcohol aqueous solution with a mass concentration of 4.5% and 0.4g of sodium carboxymethylcellulose in a water bath at a temperature of about 85°C and a stirring speed of 992rpm until they are completely dissolved, and add 0.04g of organic silicon disinfectant Foam agent and stir for about one minute, then add 0.8g of glycerol, stir and mix at high speed for 2 minutes, then add 5.2g of silica powder and stir and mix at high speed for about 30 minutes to prepare a blended modified silica emulsion, choose 2 ~ 4mm The diammonium phosphate granular fertilizer was preheated at 65°C for 4 minutes, and then the prepared blended modified silica emulsion was atomized and sprayed on the surface for several times, and the coated particles were dried by hot air at 99°C , after cooling at room temperature, the spray coating amount accounts for 42.53% of the total weight of the uncovered fertilizer, and finally spray paraffin wax solution on its surface, and the ...

Embodiment 3

[0029] Mix 40g of polyvinyl alcohol aqueous solution with a mass concentration of 5% and 0.4g of sodium carboxymethylcellulose in a water bath at a temperature of about 85°C and a stirring speed of 1049rpm until they are completely dissolved, and add 0.04g of organic silicon disinfectant Foam agent and stir for about one minute, then add 0.8g of glycerol, stir and mix at high speed for 2 minutes, then add 6.8g of silica powder and stir and mix at high speed for about 30 minutes to prepare a blended modified silica emulsion, choose 2 ~ 4mm The diammonium phosphate granular fertilizer was preheated at 65°C for 4 minutes, and then the prepared blended modified silica emulsion was atomized and sprayed on the surface for several times, and the coated particles were dried by hot air at 103°C , after cooling at room temperature, the spray coating amount accounts for 37.89% of the total weight of the uncovered fertilizer, and finally spray paraffin wax solution on its surface, and the ...

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Abstract

The invention discloses a method for preparing slow-release compound fertilizer through diammonium phosphate particles coated with blending modified silicon dioxide emulsion. According to the slow-release compound fertilizer, an inner layer coating is formed on the surfaces of the diammonium phosphate particles through the blending modified silicon dioxide emulsion, and an outer layer coating is formed on the surface of the inner layer coating through paraffin. The blending modified silicon dioxide emulsion is composed of a polyvinyl alcohol aqueous solution, sodium carboxymethylcellulose, glycerin, organic silicone emulsion and silicon dioxide powder. According to the preparation method, the emulsification and high-shearing technologies are adopted, the emulsion is evenly atomized and sprayed to the surfaces of the diammonium phosphate particles for multiple times after being stirred at a high speed, after heating drying is conducted, the cover of the emulsion is coated with paraffin liquid, and the diammonium phosphate coated slow-release compound fertilizer which is environmentally friendly and low in cost is prepared. The blending modified silicon dioxide coating emulsion can be used for coating of any compound fertilizer, and a wide application prospect is achieved.

Description

technical field [0001] The invention relates to the production field of comprehensive utilization of wet-process phosphoric acid and the field of compound fertilizer, in particular to a blended modified silicon dioxide emulsion-coated diammonium phosphate slow-release compound fertilizer and a preparation method thereof. Background technique [0002] According to statistics, 50% of the increase in food production in developing countries is attributed to the role of chemical fertilizers. China's chemical fertilizer production and consumption account for about 30% of the world, and according to the monitoring report of the Ministry of Agriculture in November 2013, the average utilization rates of nitrogen, phosphorus and potassium fertilizers in my country's three major grain crops are 33%, 24% and 42% respectively. . Low chemical fertilizer utilization rate leads to multiple fertilization in one growth cycle of crops. Excessive fertilizers gather together in the rhizosphere o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05G3/00
Inventor 丁一刚柯文昌龙秉文邓伏礼刘生鹏杜治平杨昌炎刘东何俊
Owner WUHAN INSTITUTE OF TECHNOLOGY
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