Polyamide 6 elastic fiber and preparation method thereof

The invention discloses polyamide 6 elastic fiber and a preparation method thereof. The polyamide 6 elastic fiber is made of a polyamide 6 thermoplastic elastomer, and the polyamide 6 elastic fiber has a density of 1.1 g/cm or less, a breaking strength of 2.2 cN/dtex or more, an elongation at break of 450% or more, and a boiling water shrinkage ratio of 8% or less. When the elongation is 100%,the elastic recovery rate is 80% or more, and when the elongation is 200%, the elastic recovery rate is 60% or more. Therefore, the polyamide 6 elastic fiber has the characteristics of light weight, high strength, high elongation at break, low modulus, and high resilience, and also has good properties such as high moisture regain and heat resistance. 本发明公开种聚酰胺6弹性纤维及其制备方法。所述聚酰胺6弹性纤维由聚酰胺6热塑性弹性体制成，所述聚酰胺6弹性纤维具有1.1g/cm以下的密度，2.2cN/dtex以上的断裂强度，450％以上的断裂伸长率，并且具有8％以下的沸水收缩率，当伸长率为100％时，其弹性回复率为80％以上，当伸长率为200％时，其弹性回复率为60％以上。因此，本发明的聚酰胺6弹性纤维具有轻质、高强、断裂伸长率高、模量低、回弹性高的特点，同时还具有回潮率高、耐热性好等良好性能。