Preparation method of aerogel-containing profiled polyester staple fiber

The invention discloses a preparation method of aerogel-containing profiled polyester staple fibers. The preparation method comprises the following steps: adding fully dried aerogel-containing Nth polyester master batch and fiber-grade polyester chips into a single-screw extruder for melting to obtain a mixed melt; the mixed melt is shunted through a melt pipeline and enters a spinning box body, accurate metering is conducted through a metering pump in the box body, and melt filaments are sprayed out through a spinning assembly; cooling, winding and forming the melt filaments through circular air blowing to obtain pre-spinning protofilaments; and drafting, sizing, curling and cutting off the fore-spun precursor through a post-treatment process to obtain the aerogel-containing profiled polyester staple fiber. According to the invention, the aerogel powder and the polyester are subjected to multi-stage mixing, so that the aerogel has the characteristics of good dispersity, high firmness, good air permeability a