Coating agent and preparation method thereof
A technology of coating agent and disintegrating agent, applied in the field of coating agent and its preparation, can solve the problems of destroying soil structure, difficult degradation of coating agent, and poor slow and controlled release effect.
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[0019] Preparation of polyurethane emulsion: in parts by mass, take 4 to 10 parts of dimer acid polyester diol, dry in vacuum, add 5 to 12 parts of polyisocyanate and 3 to 7 parts of isophorone diisocyanate, and control the temperature at 80~90℃, stirring reaction for 2~2.5h, cooling down to 40~50℃, adding 5~8 parts of acetone, 8~17 parts of 1,4-butanediol, 10~15 parts of dimethylol propionic acid, stirring Mix, control the temperature at 65~70℃, react for about 3~4h, add 3~10 parts of acetone, cool down to 25~30℃, add 5~10 parts of triethylamine, 18~25 parts of water, and use 110~120r / min stirring to obtain polyurethane emulsion.
[0020] A kind of preparation method of coating agent comprises the steps:
[0021] (1) According to the number of parts by mass, take 6~13 parts of slow-release component compound, 5~10 parts of sodium carboxymethyl starch, 2~6 parts of polyvinylpyrrolidone, 7~14 parts of surfactant, 30~40 parts Deionized water, 8~15 parts of polyurethane emulsi...
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