Shape memory fiber 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 reversible phase component (A) and fixed phase component (B). The preparation process of the shape memory fiber includes the following steps: preparing polyurethane with the component (A) and the component (B); and wet spinning the prepared polyurethane to prepare shape memory fiber. The shape memory fiber the present invention provides has the following features: titer higher than 300 dtex, breaking strength of 1-1.5 CN/dtex, breaking elongation of 100-400 %, deformation fixing rate not lower than 90 %, deformation recovering rate not lower than 90 %, deformation recovering temperature range of the reversible phase from -10 deg.c to +60 deg.c, and phase conversion temperature higher than 100 deg.c. 本发明涉及一种形状记忆纤维及其制备方法，该形状记忆纤维是由形状记忆聚氨酯制成，所述聚氨酯由形成可逆相的组分(A)与形成固定相的组分(B)制备得到。所述形状记忆纤维的制备方法包括步骤(1)：用组分 (A)和(B)制备聚氨酯，和步骤(2)：将步骤(1)制得的聚氨酯采用湿法纺丝制备方法而制得形状记忆纤维。本发明提供的形状记忆纤维本发明的形状记忆纤维具有以下特点：纤度高于300dtex、断裂强度1～1.5 CN/dtex、断裂伸长100％～400％，其形变固定率≥90％，形变回复率≥90％；其可逆相的形变回复温度范围为-10℃≤Ts≤60℃，固定相的相转变温度高于100℃；形变回复率达到亦达到90％以上。