文献类型：期刊文献

中文题名：PP/PA6中空橘瓣型复合超细纤维的制备及性能研究

英文题名：Study on preparation and properties of PP/PA6 hollow segmented-pie composite superfine fibers

作者：赵德方[1,2,3,4];毛加冲[1];黄芽[5];郭薇薇[1];奚清瑶[1];李献梅[1];蔡意[1];任天翔[1];占海华[1,2,3,4]

机构：[1]绍兴文理学院纺织服装学院,浙江绍兴312000;[2]绍兴文理学院浙江省清洁染整重点实验室,浙江绍兴312000;[3]绍兴文理学院国家碳纤维工程技术研究中心浙江分中心,浙江绍兴312000;[4]绍兴文理学院纤维基复合材料国家工程研究中心绍兴分中心,浙江绍兴312000;[5]凯泰特种纤维科技有限公司,浙江绍兴312000

年份：2022

卷号：59

期号：6

起止页码：44

中文期刊名：丝绸

外文期刊名：Journal of Silk

收录：CSTPCD、、Scopus、北大核心、CSCD、北大核心2020、CSCD_E2021_2022

基金：绍兴市技术创新计划项目(2019B22002);浙江省大学生科技创新项目(2021R432020,2019R432005)。

语种：中文

中文关键词：聚丙烯;聚酰胺;中空橘瓣型复合超细纤维;横截面形态;可纺性;加工工艺条件

外文关键词：polypropylene;polyamide;hollow segmented-pie composite superfine fibers;cross-section morphology;spinnability;processing conditions

中文摘要：随着锂离子电池的不断推广与应用,对电池隔膜提出了更薄、更密的要求,对其制备原料的纤维直径提出了更高的技术要求。然而,目前中国产的超细纤维难以满足单丝线密度≤0.5 dtex的要求。本文将聚丙烯(PP)和聚酰胺(PA6)进行双组分复合纺丝,通过在显微镜下观察纺流丝的横截面形态,确定纺丝组件及原料组分比例;在此基础上,通过优选工艺条件,确定纺丝温度、牵伸倍数、纺丝速度;同时对纤维的线密度、拉伸性能和取向度进行了测试分析研究。结果表明:当采用PP与PA6进行中空橘瓣型复合纺丝时,PP螺杆挤出机各区温度为225℃/225℃/230℃/230℃、PA6螺杆挤出机各区温度为270℃/270℃/275℃/275℃、PP纺丝副箱体温度为230℃、PA6纺丝副箱体为275℃、纺丝主箱体温度为270℃、PA6与PP的质量比为40︰60、纺丝速度为2800 m/min、牵伸倍数为3.0时,纤维的可纺性、拉伸性能及取向良好。制备的中空橘瓣型复合超细纤维满足了锂离子电池隔膜用超细纤维直径的要求。

外文摘要：With the continuous promotion and application of lithium-ion batteries,thinner and tighter requirements are proposed for the battery separators,thus higher technical requirements are proposed for the fiber diameter of the prepared raw materials.In general,microfine fiber refers to the fiber with a linear density of less than 1.0 dtex,which was firstly developed by Toray,Kinebo,Teijin,Kuraray,and other companies using composite spinning technology in the 1960 s,and it is one of the most technical varieties of differential chemical fibers.At present,the microfiber products on the market mainly include polypropylene(PP)microfiber,polypropylene/polyethylene(PE)composite microfiber,polyester(PET)/polyamide(PA6)composite microfiber,etc.In recent years,microfibers have become important basic materials for the preparation of lithium-ion battery separators.The common structure of microfibers includes sea-island type,double-cross type,three-point type,three-leaf type,lined type,segmented-pie type,and so on.In addition,superfine fiber is widely used in industrial fine-scale filtration,health care and bioengineering,and so on.However,it is difficult for current China-made super fibers to meet the requirement of a linear density not more than 0.5 dtex for a single filament.In this study,the proportion of polypropylene(PP)andpolyamide(PA6)was determined from experiments.Then,different raw materials were dried respectively,the dry chips that met the spinning requirements were sent to the respective screw extruders for melting and extrusion,and the melts were transported to the metering pump and composite spinning pack in the spinning box through different spinning tubes.Two different melts ejected from the spinneret were compounded into hollow segmented-pie shape in the spinning pack,cooled and solidified into composite fibers by cross air blow,then went down from the spinning tunnel to the drawing-winding area and the fiber was firstly processed by oil finish,then pre-drawing,primary drawing,secondary drawing,heat setting and other process condition before drawing.Finally,the tubes were winded to obtain composite superfine fibers.During the process of bicomponent composite spinning,the cross-section morphology of the spinning filament was observed using a microscope,and the spinning pack and the proportion of raw materials components were determined.On this basis,the process conditions including spinning temperature,draft multiple,and spinning speed were obtained;meanwhile,the linear density,tensile properties,and orientation of the fibers were tested and analyzed.The results show that when PP and PA6 are used for the segmented-pie composite spinning,each zone temperature of the screw extruder for PP is 225℃/225℃/230℃/230℃,each zone temperature of the screw extruder for PA6 is 270℃/270℃/275℃/275℃,the temperature of associate spinning box for PP is 230℃,the temperature of associate spinning box for PA6 is 275℃,the temperature of main spinning box is 270℃,the PA6/PP mass ratio is 40︰60,the spinning speed is 2,800 m/min,and the draw ratio is 3.0,the spinnability and tensile properties of the fibers are good.The prepared hollow segmented-pie composite superfine fibers have met the requirement of the superfine fiber diameter applied for lithium-ion battery separators.It not only provides certain theoretical guidance for the preparation of hollow segmented-pie composite microfiber with different raw materials,but also provides high-quality raw materials for the preparation of domestic power battery separators,and promotes the domestic development of battery energy fields.