- 學位論文
浸沾塗佈操作參數對PTFE布膜影響之研究
Studying The Effect of Operating Parameters of Dip Coating Process on PTFE Fabric
摘要
建築用PTFE布膜是以玻璃纖維與PTFE經加工後集聚一體之複合材料，此複合材料除了輕量且超強抗張力及耐撕裂強度，亦具備了自潔性佳、耐候性良好、含有難燃性、抗老化、具透光性能與加工後接合效率高的功能，以致能應用於大面積大跨距且具有代表性之永久使用建築物上。 由於PTFE布膜為有機材料(PTFE)與無機材料(玻璃纖維)相互結合所製成的複合材料，以致彼此間的相容性與結合性較差，所以本研究藉由浸沾式塗佈的方式將玻纖布浛浸於PTFE懸浮液中，經乾燥及鍛燒後製成PTFE布膜。以及本研究針對不同的操作參數，如不同的PTFE懸浮液、玻纖布浛浸時間、玻纖布塗佈速度及乾燥條件對PTFE布膜成形之影響，作深入的分析與探討。 成形布膜的完整度，主要是參考CNS 12915 L3233第6.12.1(1)節以及ASTM 5035-11來測定布膜的斷裂強力(Breaking Force)，至於成膜表面的完整度，則是用Scanning Electron Microscope (SEM) 觀察得到。此外，斷裂強力的檢測可由連續式之浛浸方式，依玻纖布塗佈速度的快慢、乾燥及燒結條件調控來得到好的布膜機械性質，其中第一次浛浸為了使PTFE能進入玻纖內部，並保護玻纖，則玻纖布塗佈速度須以慢為宜，第二至四次浛浸，為使鍛燒後布膜強度保有原玻纖之強度抑或高於，則須以玻纖布塗佈速度快、鍛燒時間短與鍛燒溫度低。因此，以玻纖布浛浸PTFE懸浮液，搭配不同塗佈速度及乾燥條件等因素，製作高機械性質之PTFE布膜為本研究之目的。
並列摘要
The composite materials of PTFE fabric in the architecture field were made of glass fiber with PTFE after drying and sintering processing. It can be used as permanent architecture membrane materials for large area and span roof with the characteristic of light weight, high tensile strength and tear resistance, good self-clean, good weather resistance, flame resistance, anti-aging, light transmission properties and high bonding efficiency after processing. Because the composite materials of PTFE fabric is a combination of organic materials (PTFE) and inorganic materials (glass fiber), it has a lower compatibility and bonding force between them. In this study the PTFE fabrics were made by dipping glass fabrics in PTFE suspension, then drying and sintering in a forced convective heater. In order to obtain good a shape of PTFE fabrics, firstly several types of PTFE suspension were screened and then determine a promising candidate PTFE solution. Subsequently, the effects of dipping time, coating speed and drying and sintering conditions on the products of PTFE fabrics were investigated. The breaking force in compliance with 6.12.1(1) of CNS 12915 L3233 and ASTM 5035-11 was used to evaluate the mechanical property of PTFE fabric products. The surface smoothness of membrane was observed by Scanning Electron Microscope (SEM). Our results showed that a high breaking force of fabric membrane can be obtained by mainly adjusting coating speed and drying and sintering conditions. In general, for the first pass of dip coating process, sufficient dipping time is required to allow PTFE suspension solution flowing into the voids of the glass fabric. For the following passes, controlling sintering time as short as possible is necessary to avoid the degradation of glass fibers.