Abstract:

Aiming at the problems of high temperature, high energy consumption and high safety requirements of poly (fluoroethylene) (PTFE) membrane, a low temperature-forming fluoroethylene vinyl ether (FEVE) membrane taken into account all aspects of PTFE membrane was developed. The manual coating method in laboratory and the low temperature curing process within 200 ℃ with polyester fabric as reforcement material and FEVE resin as matrix were developed. The mechanical properties and self cleaning properties of the FEVE/polyester reinforcement membrane material and the widely used PTFE/glass fiber membrane were also compared. It is concluded that the developed FEVE membrane materials have the tensile strength up to 99.6% of the PTFE membrane, the tear properties up to 1.3 times after impregnation coating to PTFE membrane, and it has good contamination resistance with the contact angle up to 100.4°, which meets the hydrophobic requirement of membrane contact angle greater than or equal to 90°. These conclusions confirmed the feasibility of low temperature forming of FEVE membranes.

Key words: poly (tetra fluoroethylene) membrane, fluoroethylene vinyl ether membrane, low temperature curing process, mechanical property, contamination resistance