Shape memory fiber prepared with shape memory polyurethane and its preparation process

Abstract

The present invention relates to one kind of shape memory fiber prepared with shape memory polyurethane and its preparation process. The shape memory polyurethane is prepared with material including one hydroxyl containing polymer, chain expander, diisocyanate and blocking agent in the molar ratio of 1 to 1-3 to 2.4-4.8 to 0.8-1.6. The preparation process of the shape memory fiber includes the following steps: preparing shape memory polyurethane with excessive isocyanate; adding blocking agent to obtain blocked shape memory polyurethane; and melt spinning to obtain shape memory fiber. The shape memory fiber of the present invention has very wide temperature regulating range, practical elasticity, strength and shape memory performance and comfortable hand feeling, is easy to spin alone or together with synthetic fiber and natural fiber, and may find wide application in clothing, biomedical material and other fields. 本发明涉及一种由形状记忆聚氨酯制备的形状记忆纤维及其制备方法，所述形状记忆聚氨酯是由原料有机含羟基聚合物、扩链剂、二异氰酸酯、封端剂，其摩尔比为1∶1-3∶2.4-4.8∶0.8-1.6制得。本发明提供的形状记忆纤维的制备方法包括步骤(1)：制备异氰酸酯过量的形状记忆聚氨酯；和步骤(2)：在步骤(1)得到的聚氨酯中加入封端剂，得到封端的形状记忆聚氨酯，经熔法纺丝制备得到形状记忆纤维。本发明提供的形状记忆纤维具有极宽的温度调节范围，其在弹性、强力以及形状记忆性能等方面表现出很好的实用性能，并且手感舒适，容易单独纺或与其它合成纤维、天然纤维混纺，在纺织服装、生物医用材料等领域有着广泛应用。