Biodegradable composite coating material for slow-release fertilizer and preparation method of coating material
A technology of slow-release fertilizers and coating materials, applied in fertilizer mixtures, layered/coated fertilizers, applications, etc., can solve problems such as human air, soil and food pollution, waste of resources, economic losses, and fertilizer loss, and achieve improved Effects of photosynthesis and enzyme activity, reduction of osmotic capacity, and promotion of chlorophyll formation
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[0018] The biodegradable composite coating material for the slow-release fertilizer of the present embodiment is prepared by the following steps:
[0019] (1) Add hydroxylamine hydrochloride to isopropanol, mix and stir evenly to obtain hydroxylamine hydrochloride-isopropanol solution; add sodium hydroxide to isopropanol, mix and stir evenly to obtain sodium hydroxide-isopropanol solution ; Under stirring conditions, the sodium hydroxide-isopropanol solution is added dropwise to the hydroxylamine hydrochloride-isopropanol solution until the pH of the system is neutral to obtain a mixed solution for subsequent use;
[0020] (2) Add sodium alginate and sodium hydroxide to isopropanol, add ethyl chloroacetate, stir at room temperature for 1.5h, then raise the temperature to 80°C, stir with constant temperature magnetic force for 6h, lower the temperature to 35°C, and add step by drop (1) The resulting mixture was magnetically stirred at room temperature for 5 hours, filtered, and...
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