Figured sea-island fiber and preparation method and application thereof

The invention relates to figured sea-island fiber and a preparation method and application thereof. The figured sea-island fiber is prepared from polyurethane and water-soluble polyester in a mass ratio of (5-7) to (5-3), the polyurethane is an island phase, and the water-soluble polyester is a sea phase. The figured sea-island fiber has excellent heat resistance and elasticity, and the loss of polyurethane is small during reduction. The figured sea-island fiber is applied to the field of clothes or shoes requiring high elasticity. 本发明涉及一种定岛型海岛纤维及其制备方法和应用，所述定岛型海岛纤维包括质量比为(5-7):(5-3)的聚氨酯和水溶性涤纶，所述聚氨酯为岛相，所述水溶性涤纶为海相。所述定岛型海岛纤维兼具优良的耐热性和弹性，且减量时聚氨酯损失较小。本发明将所述定岛型海岛纤维应用在要求高弹力的服饰或鞋子领域。