Preparation method of high-strength weather-resistant polyimide fiber

The invention relates to a preparation method of a high-strength weather-resistant polyimide fiber. The method comprises the following steps of dissolving a diamine monomer containing benzimidazole and a diamine monomer containing o-hydroxybenzophenone in a solvent, adding a dianhydride monomer, carrying out a random copolymerization reaction, mixing with a zinc salt, carrying out dry spinning on the obtained spinning solution, and carrying out cyclization-drafting integrated treatment. The method can realize continuous preparation, is simple to operate, environment-friendly in process and wide in raw material source, and has a good industrialization prospect; and the prepared polyimide fiber has relatively high mechanical properties, surface activity and weather resistance. 本发明涉及一种高强耐候聚酰亚胺纤维的制备方法。该方法包括：将含苯并咪唑的二胺单体和含邻羟基二苯甲酮的二胺单体溶解于溶剂中，加入二酐单体，无规共聚反应，然后与锌盐混合，将得到的纺丝原液干法纺丝，再经环化-牵伸一体化处理。该方法可连续化制备、操作简单、工艺环保、原料来源广，具有良好的产业化前景；制备得到的聚酰亚胺纤维具有较好的力学性能、表面活性和耐候性。