Studying PTFE-Glass Fabric Composite Materials for High Temperature Exhaust Gas Filtration Bag

• Main Authors: Gu,Jun-Ji, 古均吉
• Other Authors: Su Yuan-Yuan
• Format: Others
• Language: zh-TW
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/8sj7jf

碩士 === 國立臺北科技大學 === 化學工程與生物科技系化學工程碩士班（碩士在職專班） === 105 === The PTFE-Glass Fabric Composite produced in this study can use to remove PM2.5 in high temperature emission gas in industry. The experiment is divided into two parts; the first one is to combine expanded microporous Polytetrafluoroethylene (ePTFE) film with PTFE-dipped glass fabric in a single-stage wet process that can greatly increase the production efficiency in current industry. Two types of glass fabric dip with different solid contents of PTFE suspension. The PTFE-dipped glass fabric then affix with ePTFE film on its one side under suitable operation conditions to obtain PTFE-glass fabric composite with appropriate bonding strength, pore size distribution and air permeability for filtration bag. The filtration bag with 15% PTFE solid content produced by the single-stage wet process has 700g of bonding strength, lower than 1µm of pore diameter, and 2 cm³/cm²/s of air permeability. These properties achieve the commercial product standard. The second part in this study is to prepare microporous thin film, instead of ePTFE, and coated on the surface of PTFE-glass fabric. In this part, an emulsion solution of PTFE with micro-sized micelles by using appropriate plasticizer was prepared first, and then coated on the above-mentioned PTFE-glass fabric by dip process. Finally, a thin film with microporous formed on the surface of the PTFE-glass fabric after drying and sintering. The microporous film contained about 2.5µm of pore diameter, but the air permeability is not comparable to the PTFE-glass fiber composite made of ePTFE film. This problem can be solved by adjusting the coating process and the weaving patterns of fabric.