Preparation method of ammonium polyphosphate flame retardant microcapsule coated with epoxy resin

The invention belongs to the technical field of materials, in particular relating to a preparation method of ammonium polyphosphate (APP) flame retardant microcapsule coated with epoxy resin. The specific steps are as follows: firstly, 1-4g of epoxy resin and 0.2-2g of curing agent are stirred and dispersed in 50-100ml of solvent; then, APP and dispersant are added into the system, stirring and dispersion are continued for 20-40min; the temperature is raised to 50-120 DEG C, and curing reaction is carried out for 1-8h; after the reaction is stopped, filtering and drying is carried out to obtain the flame retardant APP microcapsule powder coated with epoxy resin. The prepared microcapsule has uniform condensation and good liquidity.