热定形工艺对高强型聚酯工业丝结构性能的影响  

Influence of heat-setting process on structure and properties of high-tenacity polyester industrial yarns

作　　者：张颖[1] 宋明根 姬洪 陈康 张先明[1] ZHANG Ying;SONG Minggen;JI Hong;CHEN Kang;ZHANG Xianming(National Engineering Lab for Textile Fiber Materials and Processing Technology,Zhejiang Sci-Tech University,Hangzhou,Zhejiang310018,China;Zhejiang Unifull Industrial Fiber Co.,Ltd.,Huzhou,Zhejiang313017,China)

机构地区：[1]浙江理工大学纺织纤维材料与加工技术国家地方联合工程实验室,浙江杭州310018 [2]浙江尤夫高新纤维股份有限公司,浙江湖州313017

出　　处：《纺织学报》2023年第9期43-51,共9页Journal of Textile Research

基　　金：浙江省重点研发计划项目(2020C01143,2021C01020);中国纺织工业联合会科技指导性计划项目(2021003)。

摘　　要：为探究不同热定形温度获得的高强型聚酯工业丝性能差异的内在结构因素,对3种高强型聚酯工业丝的结构性能进行对比。采用小角X射线散射和广角X射线衍射方法对其多尺度微观结构进行研究,结合力学性能及热收缩等结果,明确不同热定形工艺对高强型工业丝结构性能的影响。结果表明:热定形温度主要影响聚酯工业丝非晶区取向和片晶结构;相比于高强中缩(HTMS)和高强(HT)聚酯工业丝,高强低伸型(HTLE)聚酯工业丝的热定形温度低,高倍牵伸产生的伸直非晶区分子链在较低热定形温度下并未及时排入晶格形成结晶,而发生了小幅的回复,导致HTLE聚酯工业丝表现出非晶区取向高、结晶度低、晶粒尺寸小与片层倾斜角较大的结构特点,从而使断裂伸长率最小、初始弹性模量最大、尺寸稳定性差。Objective The continuous expansion of the application field of polyester industrial fiber puts forward more detailed requirements for its performance,and the relationship between process-structure-performance needs to be further clarified.In order to explore the intrinsic structural factors of the differences in the application fields of high-tenacity polyester industrial yarns obtained at different heat-setting temperatures,the structure and properties of three high-tenacity polyester industrial yarns were compared.Method Synchrotron radiation small-angle X-ray scattering(SAXS)and wide-angle X-ray diffraction(WAXD)were adopted to study its multi-scale microstructure.Establish a multi-level structure analysis method from macro to micro was established,and the influences of different heat-setting processes on the structure and properties of high-tenacity industrial yarns were clarified.Results The fiber spinning process differences between the three high-tenacity polyester industrial yarns were reflected in the difference of heat-setting temperatures(Tab.1).Compared with high-tenacity medium-shrinkage(HTMS)and high-tenacity(HT)polyester industrial yarns,high-tenacity low-elongation(HTLE)was shown to have lower heat-setting temperature,resulting in higher amorphous orientation,lower crystallinity,smaller crystallite size,smaller long period and larger tilting angle of crystalline lamellae(Tab.4 and Tab.5).Because the microstructures with high crystallinity and high orientation are formed under the condition of high drafting ratio,the breaking strength of the three industrial yarns are relatively high,and the differences are not obvious(Ta b.2).The mechanical properties are different in elongation at break,initial modulus,elongation at a specific tenacity of 4.0 cN/dtex(Easl-4)and tenacity at a specific elongation of 5%(Lase-5).HTLE polyester has the smallest elongation at break,the largest initial modulus,the largest thermal shrinkage,the worst dimensional stability,and the highestαtransition temperature.HTLE has

关 键 词：高强型聚酯工业丝 结晶结构 片晶结构 小角X射线散射 广角X射线衍射 力学性能 热定形 

分 类 号：TS102[轻工技术与工程—纺织工程]