Abstract: A spinning solution, a heat-resistant creep-resistant fiber and preparation method therefor are provided. The spinning solution includes a polyethylene, a solvent and a photoinitiator, and the content of the photoinitiator is 0.2 wt %-10 wt % of the mass of the polyethylene; gel-spinning and multi-stage drafting the spinning solution; then performing ultraviolet irradiation by an ultraviolet light source to obtain a heat-resistant creep-resistant polyethylene fiber; the light intensity and the time of the ultraviolet light source is 100 W/cm2-5000 W/cm2 and 10 s-600 s, respectively; the gel content and the crystallinity of the heat-resistant creep-resistant polyethylene fiber is 20 wt %-100 wt % and 50 wt %-90 wt %, respectively; the creep rate of the fiber is 10?8 s?1-10?7 s?1 under conditions of a temperature of 70° C. and a load of 300 MPa; the fracture temperature of the fiber is 155° C.-245° C. under conditions of a load of 15 MPa and a heating rate of 2° C./min.

Abstract: A composition for making polyamide fiber comprises: (a) about 85 to about 99.9% by weight, preferably about 90 to about 99.5% by weight, more preferably about 95 to about 99.5%, such as about 95 to about 99% by weight of a polyamide, based on the total weight of the composition; (b) about 0.1% to about 15% by weight, preferably about 0.1% to about 10% by weight, more preferably about 0.5% to about 5%, such as about 1 to about 5% by weight of one or more thermoplastic polymers, based on the total weight of the composition, wherein the thermoplastic polymer in the composition is miscible with component (a). A process for making a polyamide fiber uses the composition of the invention.

Abstract: A composition for making polyamide fiber comprises: (a) about 85 to about 99.9% by weight, preferably about 90 to about 99.5% by weight, more preferably about 95 to about 99.5%, such as about 95 to about 99% by weight of a polyamide, based on the total weight of the composition; (b) about 0.1% to about 15% by weight, preferably about 0.1% to about 10% by weight, more preferably about 0.5% to about 5%, such as about 1 to about 5% by weight of one or more thermoplastic polymers, based on the total weight of the composition, wherein the thermoplastic polymer in the composition is miscible with component (a). A process for making a polyamide fiber uses the composition of the invention.