Preparation method of heat-resistant sewing thread

The invention relates to a preparation method of a heat-resistant sewing thread, and belongs to the technical field of spinning. The method comprises the following steps of preparing an oxidized polyethylene wax micro-emulsion by adopting a high-pressure emulsification method to serve as a softening agent, adding the micro-emulsion into polyether ether ketone resin, preparing polyether ether ketone fibers by melt spinning, twisting the polyether ether ketone fibers and polytetrafluoroethylene fibers to form a blank thread, soaking the blank thread in a polyphenylene sulfide resin melt, and performing curing to obtain a sewing thread material with good heat resistance and wear resistance. The capability of forming a film by the oxidized polyethylene wax micro-emulsion is good, the frictioncoefficient of the fiber surface can be remarkably reduced, the melting point is high, the micro-emulsion can be used as the softening agent of the high-speed sewing thread, the flexibility is high, and the warp breaking prob