Preparation of acrylic ester mixed polymer urea slow release coating agent

Abstract

The invention discloses a preparation method of a urea slow-release film coating agent of an acrylic ester mixed polymer, which comprises the following steps: the preparation of the acrylic ester mixed polymer, the preparation of water-soluble polymer water solution and the preparation of the slow-release film coating agent of the acrylic ester mixed polymer. The preparation method takes water as a polymerization medium, polymer emulsion prepared by segmentation emulsion polymerization effectively controls water resistance and mechanical properties of slow-release materials, and the polymer emulsion is added with the water-soluble polymer material to improve the film forming capacity of the emulsion and the stability of the film material. The method has the advantages that no organic solvent is adopted during the production process, no waste gas and waste liquid is produced, and the slow-release film coating material obtained has good film forming effect, excellent slow-release function and good water solubility, therefore, the slow-release film coating agent is an ideal environment-friendly film coating material.

Description

technical field [0001] The invention relates to a preparation method of a fertilizer slow-release coating agent, in particular to a preparation method of an acrylate mixed polymer urea slow-release coating agent. Background technique [0002] The main variety of nitrogen fertilizer at home and abroad is urea, which is the most used nitrogen fertilizer variety in the world. In most areas, such as tropical areas, arid or semi-arid areas and paddy fields, the fertilizer efficiency of urea rarely exceeds 50%. One of the main reasons for the loss of urea fertilizer is the rapid hydrolysis of urea under the catalysis of soil urease, which leads to the volatilization loss of ammonia. In order to improve the utilization rate of nitrogen in urea, the United States, Japan, and the European Union use resin or sulfur to wrap urea. The production company has introduced resin coating technology. Although it can control the slow release of fertilizer effect to a certain extent, the resin i...

AI Technical Summary

Problems solved by technology

One of the main reasons for the loss of urea fertilizer is the rapid hydrolysis of urea under the catalysis of soil urease, which leads to the volatilization loss of ammonia. In order to improve the utilization rate of nitrogen in urea, the United States, Japan, and the European Union use resin or sulfur to wrap urea. The production company has introduced resin coating technology. Although it can control the slow release of fertilizer effect to a certain extent, the resin is difficult to degrade in the soil, and long-term application will destroy the soil structure.

At present, there are many kinds of crops in our country, which require different types of coated slow-release agents that release nutrients in different time periods. Using thermoplastic resins as coated slow-release materials has the disadvantages of polluting the environment and toxic solvents. Environmentally friendly coating materials during production and use

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