微粉特性和热处理对聚四氟乙烯车削膜均匀性的影响  

Effect of Powder Characteristics and Heat Treatment on Uniformity of Polytetrafluoroethylene Turning Film

作　　者：姜梦瑶 孟庆文[2] 徐文玉 侯明鹏 李秋影[1] Mengyao Jiang;Qingwen Meng;Wenyu Xu;Mingpeng Hou;Qiuying Li(School of Material Science and Engineering,East China University of Science and Technology,Shanghai 200237,China;Zhejiang Juhua Company Limited Fluoropolymer Division,Quzhou 324004,China)

机构地区：[1]华东理工大学材料科学与工程学院,上海200237 [2]浙江巨化股份有限公司氟聚合物事业部,浙江衢州324004

出　　处：《高分子材料科学与工程》2025年第1期106-113,共8页Polymer Materials Science & Engineering

摘　　要：在聚四氟乙烯(PTFE)车削膜的制备过程中,因PTFE原料微粉形态、粒径和相对分子质量的不同,可能会出现云斑现象,导致其结晶度、密度和透光率的均匀性较差。对具有云斑缺陷的2种PTFE车削膜进行了热处理,通过密度测试发现热处理后其密度均匀性得到提高;通过差示扫描量热仪对其结晶度进行了表征,结果表明,经过热处理后,其结晶度之差分别由2.22%和12.79%降至0.38%和0.47%,几乎可以忽略不计;通过紫外-可见分光光度计对其透光率进行了表征,结果表明,其透光率之差分别由18.04%和8.28%降至0.54%和1.08%,云斑膜的均匀性得到明显改善。In the preparation process of polytetrafluoroethylene(PTFE)turning film,cloud spots may appear due to the different morphology,particle size and molecular weight of PTFE raw materials,resulting in poor uniformity of crystallinity,density and light transmittance.Two kinds of PTFE turning films with cloud spot defects were heat treated.Through density test,it is found that the density uniformity is improved after heat treatment.The crystallinity was characterized by differential scanning calorimetry(DSC).The results show that the difference of crystallinity decreases from 2.22%and 12.79%to 0.38%and 0.47%respectively after heat treatment,which is almost negligible.The transmittance was characterized by ultraviolet-visible spectrophotometer(UV-vis)spectrophotometer,and the results show that the difference of transmittance decreases from 18.04%and 8.28%to 0.54%and 1.08%respectively,and the uniformity of the cloud spot films is obviously improved.

关 键 词：聚四氟乙烯 车削膜 结晶 均匀性 热处理 

分 类 号：TQ325.4[化学工程—合成树脂塑料工业]