Cospun fiber and preparation method thereof

The invention discloses a co-spun fiber and a preparation method thereof, and belongs to the technical field of fibers. The raw materials of the co-spun fiber comprise poly (aromatic oxadiazole) and poly (p-phenylene terephthamide). The preparation method of the co-spun fiber comprises the steps that spinning is conducted on a spinning solution to prepare the co-spun fiber, a solvent in the spinning solution comprises concentrated sulfuric acid or fuming sulfuric acid, and aromatic polyoxadiazole and poly-p-phenylene terephthamide are dissolved in the solvent. The problem that the strength of the polyaromatic oxadiazole fiber is low can be solved. 一种共纺纤维及其制备方法，属于纤维技术领域。共纺纤维的原料包括聚芳噁二唑和聚对苯二甲酰对苯二胺。共纺纤维的制备方法包括：将纺丝溶液进行纺丝制得共纺纤维，纺丝溶液中的溶剂包括浓硫酸或发烟硫酸，溶剂中溶解有聚芳噁二唑和聚对苯二甲酰对苯二胺。其能够改善聚芳噁二唑纤维强度低的问题。