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本文作者介绍了一种消除聚四氟乙烯容器造成的污染的方法,本法先用酸处理容器表面的无机颗粒,再加热熔融形成光滑表面,从而避免深层无机颗粒的逸出而防止由此造成的污染。作者研究了各种加热熔融方法,发现用煤气加热熔融最为简便。调节煤气流量使火焰的高度约10cm,使火焰中间部分触及聚四氟乙烯表面进行加热,因火焰的端点为氧化焰可分解聚四氟乙烯。在加热时火焰不能总停在一个地方,在容器的整个表面均匀地一边晃动一边加热,可得到光滑致密的表面。作者用电子显微镜扫描观察在变化加热时间时聚四氟乙烯表面的熔融情况。当火焰触及到10 cm~2时加热约20秒钟可获得光洁的表面层,再形成熔化紧密的表面。加热时间短熔融不完全,而过长则会有残留发泡的痕迹与裂纹并有一部分炭化。这些情况肉眼可见。
This article describes a method to eliminate contamination caused by Teflon containers by first treating the inorganic particles on the surface of the container with acid and then heating and melting to form a smooth surface to prevent the escape of deep inorganic particles and to prevent the resulting Pollution. The author studied various heating and melting methods and found that it is most convenient to heat and melt with gas. Adjust the gas flow so that the flame height of about 10cm, so that the middle part of the flame touches the surface of polytetrafluoroethylene for heating, because the flame end of the flame can be decomposed PTFE flame. When heating, the flame can not always stop in one place, and the entire surface of the container is uniformly heated while being shaken to obtain a smooth and dense surface. The authors observed the melting of polytetrafluoroethylene (PTFE) surfaces at varying heating times by scanning electron microscopy. When the flame touches 10 cm ~ 2 when heated for about 20 seconds to get a smooth surface layer, and then the formation of a molten surface. Short heating time melting incomplete, and too long there will be traces of residual foam and cracks and some carbonization. These conditions are visible to the naked eye.