全生物基PA 510纤维的制备及其高温加速热氧老化研究  

Preparation and high temperature accelerated thermal-oxidative aging of fully bio-based PA 510 fiber

作　　者：杜心宇 宫玉梅 姜锋 胡志宇 贾吉 朱雷 DU Xinyu;GONG Yumei;JIANG Feng;HU Zhiyu;JIA Ji;ZHU Lei(School of Textile and Material Engineering,Dalian Polytechnic University,Dalian 116034;State Key Laboratory of Biobased Fiber Manufacturing Technology,Beijing 100025;China Textile Academy Co.,Ltd.,Beijing 100025)

机构地区：[1]大连工业大学纺织与材料工程学院,辽宁大连116034 [2]生物源纤维制造技术国家重点实验室,北京100025 [3]中国纺织科学研究院有限公司,北京100025

出　　处：《合成纤维工业》2024年第6期7-13,共7页China Synthetic Fiber Industry

摘　　要：以全生物基聚酰胺510(PA 510)切片为原料,经过干燥后以3000 m/min的纺速熔融纺丝制备PA 510预取向丝(POY),并对纤维进行高温加速热氧老化处理,研究了纤维热氧老化前后结构与性能的变化。结果表明:PA 510纤维在热氧化过程中分子链发生断裂,产生了己内酰胺、酸类、酯类等结构而使其发黄变脆;在一定热氧老化温度下,随着热氧老化时间的延长,PA 510纤维的蓝黄值(b^(*))逐渐增大,且热氧老化温度越高,b^(*)的上升速率越快;PA 510纤维在195℃下热氧老化10 min后,熔点从216℃降低至212℃,相对黏度从2.62下降至1.41,断裂强度从3.25 cN/dtex下降至0.75 cN/dtex,断裂伸长率从112%下降至5%;PA 510纤维的相对黏度下降至2.34时会达到临界脆化点;通过时间-温度叠加分析建立相对黏度和b^(*)之间的关系,可以利用b^(*)快速检测纤维的脆化情况。Using fully bio-based polyamide 510(PA 510)chips as raw material,PA 510 pre-oriented fibers(POY)were prepared by melt spinning at a speed of 3000 m/min after drying.The fibers were subjected to high-temperature accelerated thermal oxidative aging treatment.The changes in the structure and properties of the fibers were studied before and after thermal oxidative aging treatment.The results showed that the molecular chains of PA 510 fibers broke during thermal oxidation,thus producing the structures of caprolactam,acids,esters,etc.,which caused the fibers to turn yellow and become brittle;the blue yellow value(b^(*))of PA 510 fibers gradually increased as the thermal oxidative aging time prolonged at a certain thermal oxidative aging temperature,and the higher the thermal oxidative aging temperature was,the faster the b^(*)increased;the melting point of PA 510 fiber decreased from 216℃to 212℃,the relative viscosity decreased from 2.62 to 1.41,the breaking strength decreased from 3.25 cN/dtex to 0.75 cN/dtex,and the elongation at break decreased from 112%to 5%after 10 min of thermal oxidative aging at 195℃;and it reached the critical brittleness point when the relative viscosity of PA 510 fiber decreased to 2.34;the relationship between relative viscosity and b^(*)was established through time-temperature superposition analysis,hence b^(*)can be used to quickly detect the brittleness of the fiber.

关 键 词：全生物基聚酰胺510纤维 熔融纺丝 高温热氧老化 相对黏度 时间-温度叠加分析 

分 类 号：TQ342.19[化学工程—化纤工业]