Preparation method of acrylate mixed polymer urea sustained-release coating agent
A slow-release coating agent, acrylate technology, applied in fertilizer mixtures, fertilization devices, applications, etc., can solve problems such as soil structure damage, ammonia volatilization loss, solvent toxicity, etc., achieve good water solubility and improve film-forming performance , Improve the effect of film stability
Active Publication Date: 2011-12-21
CNOOC FUDAO
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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
Method used
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[0024] (1) Add 300 kg of deionized water into the polymerization reactor, and start the mixer.
[0025] (2) Add 6.0 kg of sodium dodecylbenzene sulfonate until completely dissolved.
[0026] (3) Add 10kg of acrylamide under stirring until it is completely dissolved, and turn on low-pressure steam for heating.
[0027] (4) Add 30kg of isopropanol and 50kg of butyl acrylate, 30kg of acrylic acid and 30kg of methyl methacrylate into the mixing tank, and mix well. When the temperature of the aqueous solution in the reaction kettle rises to about 75°C, pump the above mixed solution into the reaction kettle, add 2kg of ammonium persulfate, and polymerize at 80°C for 1 hour.
[0028] (5) Add 20kg of isopropanol and 30kg of butyl acrylate to the mixing tank, mix them evenly, and pump them into the reaction kettle; add 50kg of styrene and 5kg of acrylonitrile into another mixing tank, mix them evenly, and pump them into the reactor. into the reactor; and 2kg of ammonium persulfate wa...
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The invention discloses a preparation method of an acrylate mixed polymer urea slow-release coating agent, comprising a preparation process of an acrylate mixed polymer, a preparation process of a water-soluble polymer aqueous solution, and an acrylate mixed polymer slow-release coating agent preparation process. The present invention uses water as the polymerization medium and utilizes the polymer emulsion prepared by staged emulsion polymerization to effectively control the water resistance and mechanical properties of the slow-release material, and to add water-soluble polymer materials to the emulsion to improve the film-forming performance and performance of the emulsion. The stability of the membrane material, no organic solvents are used in the production process, no waste gas and waste liquid, the prepared coated sustained-release material has good film-forming effect and excellent slow-controlled release function, and has the advantages of good water solubility, etc. It is a kind of An ideal environmental protection 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...
Claims
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IPC IPC(8): C05G3/00
Inventor 姚光前张夫道杨斌傅送保张昕照梁明初赵福军王洪波
Owner CNOOC FUDAO