Polyesteramide, preparation method thereof and fiber

The invention provides polyesteramide, a preparation method thereof and a fiber. The preparation method of the polyesteramide comprises the following steps: adding an antioxidant, and introducing nylon salt in the form of a deoxygenated aqueous solution after esterification reaction is finished, so that the problem of serious yellowing frequently occurring in the synthesis process of the polyesteramide is solved, and the obtained polyesteramide has a lower yellow index, moreover, the fiber prepared from the polyesteramide has higher breaking strength and good elongation at break. 本发明提供一种聚酯酰胺及其制备方法和纤维。所述的聚酯酰胺的制备方法包括加入抗氧剂，并在酯化反应结束后以除氧水溶液的形式引入尼龙盐，从而解决了聚酯酰胺合成工艺中常出现的黄变严重问题，使所得到聚酯酰胺具有较低的黄色指数。并且采用所述的聚酯酰胺制得的纤维，具有更高的断裂强度，并且具有良好的断裂伸长率。