聚四氟乙烯滤料的高温蠕变行为与抗蠕变研究  

High temperature creep behavior and anti-creep treatment of PTFE filter

作　　者：郑依铭 吴海波[1] ZHENG Yiming;WU Haibo(College of Textile,Donghua University,Shanghai 201620,China)

机构地区：[1]东华大学纺织学院,上海201620

出　　处：《毛纺科技》2022年第1期1-6,共6页Wool Textile Journal

摘　　要：聚四氟乙烯(PTFE)针刺滤料的寿命与蠕变失效密切相关。为预测其长期蠕变行为,在200~260℃范围内进行梯度蠕变实验,借助时温等效原理得到滤料的蠕变曲线,并进一步探究后处理工艺对PTFE针刺滤料蠕变性能的影响。结果表明:在恒定拉应力下PTFE滤料发生了蠕变和其他多种形变,长时间尺度内蠕变起主要作用,预测滤料的高温蠕变寿命在3年左右。此外,时移因子与温度的关系曲线满足WLF方程,意味着时温等效原理描述PTFE滤料的高温蠕变行为是适用的。在试验周期内,松弛热定形增加了滤料的蠕变应变量,定长热定形、浸渍整理、覆膜整理降低了滤料的蠕变应变量,其中覆膜整理滤料的抗蠕变性能最佳。The life of polytetrafluoroethylene needle-punched filter material is closely related to creep failure.In order to explore the creep behavior of polytetrafluoroethylene needle-punched filter under high temperature,stepped creep experiments were carried out in the range of 200-260℃,and the long-term creep curve of the filter was predicted by time-temperature equivalence principle.And the influence of post-treatment on the creep performance of PTFE filter was further explored.The results show that under constant tensile stress,the PTFE filter undergoes creep and various other deformations,and creep plays a major role in a long-term scale.The high temperature creep life of the filter material is predicted to be about 3 years.In addition,the relationship curve between time shift factor and temperature satisfies the WLF equation,which means that the time-temperature equivalent principle is applicable to describe the high-temperature creep behavior of PTFE filter.During the test period,the relaxation heat setting increases the creep strain of the filter,while fixed-length heat setting,immersion finishing and coating finishing reduces the creep strain of the filter material.Among them,the creep resistance of the membrane filter is the best.

关 键 词：聚四氟乙烯滤料 蠕变 时温等效原理 后处理 残余强力 

分 类 号：TS17[轻工技术与工程—纺织材料与纺织品设计]