Environmental protection type slow-release fertilizer coating material preparation method

The present invention belongs to the technical field of slow-release fertilizer coating material preparation, and relates to an environmental protection type slow-release fertilizer coating material preparation method, which comprises: taking a natural skim rubber, pre-treating, taking manihot esculenta starch, and modifying to obtain modified starch for spare; and adding the modified starch to the natural skim rubber, rapidly and uniformly mixing, adding a cross-linking agent and a short chain starch activator, and carrying out a reaction to obtain a starch grafted and modified natural skim rubber emulsion, ie., the environmental protection type slow-release fertilizer coating material. According to the present invention, the pre-activation short chain starch emission grafting technology is used, the process is simple, and the reaction is stable; and according to the obtained slow-release fertilizer coating material, the slow-release property of the fertilizer can be regulated, the coating has good toughness and good soil burying degradation property, the high added value utilization of the natural skim rubber is easily achieved, the natural environment protection and the l petrochemical resource saving are easily achieved, and the traditional agriculture is easily converted into the green organic agriculture.