Crosslinked styrene block copolymer mixture elastic fiber and manufacturing method thereof

The invention relates to a manufacturing method of a crosslinked styrene block copolymer blend elastic fiber, which comprises the steps of: a) providing a styrene block copolymer blend by blending, wherein at least one styrene block copolymer A and at least one ethylene copolymer B are included; B) melt-spinning the styrene block copolymer mixture to obtain elastic fibers; C) carrying out irradiation crosslinking on the obtained elastic fibers; wherein the styrene block copolymer A is an unsaturated styrene block copolymer, the styrene/rubber ratio is 10: 90-45: 55, the melt index (200 DEG C/5.0 kg) is 1-50 g/10 min, the density of the ethylene copolymer B is 0.855-0.890 g/cm3, the melt index (190 DEG C/2.16 kg) is 0.5-10 g/10 min, and the ratio of the styrene block copolymer A to the ethylene copolymer B is 85: 15-15: 85. 本发明涉及一种交联的苯乙烯嵌段共聚物混合物弹性纤维的制造方法，包含如下步骤：a)通过共混来提供一种苯乙烯嵌段共聚物混合物，其包含至少一种苯乙烯嵌段共聚物A、以及至少一种乙烯共聚物B；b)对所述苯乙烯嵌段共聚物混合物进行熔融纺丝从而得到弹性纤维；c)对所获得弹性纤维进行辐照交联；其中，所述苯乙烯嵌段共聚物A为不饱和苯乙烯嵌段共聚物，其苯乙烯/橡胶比例在10∶90到45∶55之间