PA 6/PET皮芯复合中空纤维的制备及纺丝工艺研究

Preparation and spinning process of PA 6/PET sheath-core composite hollow fiber

以聚己内酰胺(PA 6)和聚对苯二甲酸乙二醇酯(PET)切片为原料,使用双组分复合纺丝机,利用复合中空纺丝组件进行复合纺丝制得PA 6/PET复合中空纤维,通过Poly Flow软件模拟,确定了喷丝板微孔尺寸,并对复合纺丝工艺进行了研究。结果表明:纺丝组件中喷丝板的微孔区间隙为0.08 mm,可以满足PA 6/PET皮芯复合中空纤维的纺丝要求;PA 6/PET皮芯复合中空纤维的中空度随着PA 6/PET流量比和吹风速度的增大而增大;随着PA 6/PET泵供量、纺丝温度和吹风起始高度的增大而减小;最佳纺丝工艺为吹风速度0.55 m/s,吹风起始高度100 mm,纺丝温度284℃,PA 6及PET单孔体积流量分别为2.4×10^(-8)及1.2×10^(-8)m^3/s,泵供量为3.6×10^(-8)m^3/s,卷绕速度3 000 m/min,在此条件下制得的PA 6/PET皮芯复合中空纤维的断裂强度为1.41 cN/dtex,断裂伸长率为120.50%。

A polycaprolactam/polyethylene terephthalate（ PA 6/PET） composite hollow fiber was prepared by using PA 6 and PET chips as raw material via composite spinning process on a bicomponent composite spinning machine equipped with composite hollow spinning pack. The spinneret microhole size was decided and the composite spinning conditions were optimized through Poly Flow software. The results showed that the spinning pack with the spinneret microhole gap of 0. 08 mm could satisfy the spinning requirement of PA 6/PET sheath-core composite hollow fiber; the hollowness of the PA 6/PET sheath-core composite hollow fiber was increased with the increase of PA 6-and-PET flow ratio and air blow speed and was decreased with the increase of the pump delivery of PA 6/PET,spinning temperature and initial air blow height. The PA 6/PET sheath-core composite hollow fiber could be prepared with the breaking strength of 1. 41 c N/dtex and elongation at break of 120. 50% when the spinning process conditions were optimized as： air blow speed 0. 55 m/s,initial air blow height 100 mm,spinning temperature 284 ℃,PA 6 and PET single hole volume flow of 2. 4 × 10^-8 and 1. 2 × 10^-8 m^3/s,respectively,pump delivery 3. 6 × 10^-8 m^3/s,winding speed 3 000 m/min.