Studying The Effect of Operating Parameters of Dip Coating Process on PTFE Fabric

• Main Authors: Chieh-Wen Hsu, 徐杰文
• Other Authors: Yuan-Yuan Su
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/avp5hx

碩士 === 國立臺北科技大學 === 化學工程研究所 === 101 === 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.