Preparation method of double-control slow release multi-element coating composite fertilizer
A technology of controlled slow-release and compound fertilizer, applied in fertilization devices, fertilizer mixtures, applications, etc., can solve the problems of secondary pollution, high cost, and high technical requirements for fertilization, and achieve the effect of prolonging fertilizer efficiency period and improving fertilizer utilization rate.
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[0019] The preparation method of the double-controlled slow-release multi-element coating compound fertilizer comprises the following steps:
[0020] Synthesis of low-formaldehyde urea-formaldehyde: Add urea and formaldehyde with a molar ratio of 1:0.8 into the reactor at one time, heat and stir, stop heating when the temperature rises to 25 °C, and adjust the pH value to 4.0-5.0 after the urea dissolves, and react After 10-20 min, the turbidity point appears, adjust the pH value to 5.0-6.0, react for a period of time, adjust the pH value to 7.0-8.0 with sodium hydroxide solution, cool down and discharge.
[0021] Preparation of urea-formaldehyde-oxidized starch-diatomite organic-inorganic composite slow-release material: select a ratio of 1:1.2 and mix to prepare urea-formaldehyde-oxidized starch binder, and then mix with diatomaceous earth in a mass ratio of 3:1 to prepare urea-formaldehyde-oxidized Starch-diatomaceous earth composite slow-release material. Its properties: ...
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