Preparation method of flame-retardant droplet-resistant terylene

The invention discloses a preparation method of flame-retardant droplet-resistant terylene. The preparation method comprises the following steps of: A) evenly mixing four materials including a flame-retardant droplet resistant basic magnesium sulfate whisker, a beta-type silicon nitride whisker, a tetrapod-like zinc oxide whisker and a magnesium salt whisker, baking the mixture in a vacuum furnace; stirring and dispersing the mixture in a sodium hexametaphosphate solution, carrying out atmospheric pressure plasma treatment, and then filtering and baking the solution by a filter with 200 meshes; B) mixing the whiskers obtained from the step A) with flame-retardant melamine cyanurate, a microencapsulated red phosphorus retardant, and a silane coupling agent under the condition of 75 DEG C; C) preparing a flame-retardant droplet resistant whisker ethylene glycol solution by a flame-retardant droplet resistant whisker obtained in the step B); and D) preparing a flame-retardant droplet resistant polyester from the flame-retardant droplet resistant whisker in a blending or copolyester manner, and preparing the sheath-core flame-retardant droplet resistant terylene of taking the flame-retardant droplet resistant polyester as a skin layer by using a compound spinning technology.