Coating agent for slow release fertilizer
A technology of slow-release fertilizers and coating agents, applied in application, fertilizer mixtures, fertilization devices, etc., can solve the problems of difficult degradation of coatings, environmental pollution, etc., reduce production costs, solve moisture absorption and agglomeration, and improve appearance quality Effect
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[0027] Example
[0028] Preparation of coating agent:
[0029] Add 10 liters of 2.0 (wt)% chitosan acetic acid aqueous solution, 18 kilograms of starch gelatinization solution, 2.5 kilograms of PVA, 0.35 liters of glycerol and 0.1 liter of Tween 80 to the reaction kettle, adjust the pH to 3, and heat up under stirring. To 90℃, add 1.5 liters of 37% formaldehyde aqueous solution, keep the temperature and stir for 1 hour, add 0.05 kg of NH 4 Cl, continue to stir for 10 minutes, discharge the material and transfer it to the coating agent storage tank for later use.
[0030] Film coating:
[0031] Take 100 kilograms of granular fertilizer and put it into the coating equipment, set the sheet temperature to 65°C, and the coating pot speed to 15 revolutions per minute. Start the hot air heating device. When the tablet temperature reaches the set temperature, slowly pour in the pre-melted paraffin wax (melting point: 55-63°C), stop heating, and let in cold air a...
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