Preparation of acrylic ester mixed polymer urea slow release coating agent

A slow-release coating agent and acrylate technology, applied in fertilizer mixtures, fertilization devices, applications, etc., can solve the problems of destroying soil structure, resin refractory degradation, solvent toxicity, etc., achieve good water solubility and improve film-forming performance , The effect of improving the stability of the membrane material

Active Publication Date: 2009-01-28
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, th

Method used

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  • Preparation of acrylic ester mixed polymer urea slow release coating agent
  • Preparation of acrylic ester mixed polymer urea slow release coating agent

Examples

Experimental program
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Embodiment

[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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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...

Claims

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Application Information

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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
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