Preparation method of high-bulk-density polyimide powder

The invention discloses a preparation method of high-bulk-density polyimide powder, which comprises the following steps: a) dissolving an amine raw material and an anhydride raw material in a solvent, and stirring in a polymerization kettle at-10-25 DEG C to form a uniform and transparent polyamide acid solution; b) adding a cross-linking agent, a catalyst and a seed crystal into the solution, then heating to 80-100 DEG C, stirring, completing powder discharging and aging processes, and cooling to obtain a suspension; and c) centrifuging the turbid liquid to obtain a polyimide solid crude product, and carrying out high-temperature heat treatment, crushing and grading on the crude product to obtain a polyimide finished product. The processing process of the polyimide molding powder is improved. And during processing, the exhaust demand is reduced, and the processing conditions are milder. According to the invention, the performance of the polyimide molded part is improved. 本发明公开了一种高堆密度聚酰亚胺粉末的制备方法，包括以下步骤：a)将胺类原