A study on fluorinated ethylene propylene/polytetrafluoroethylene foam coating composite as potential flue gas filtration materials

Expanded polytetrafluoroethylene membrane-laminated filters, featuring chemical durability and high temperature resistance, have attracted a large amount of attention in the field of baghouse filter. However, their poor physical properties and short-term life are concerned recently. As an alternative to expanded polytetrafluoroethylene-laminated membrane filters, foam coating provides another route for dust removal by bag-house filter. In this paper, a remarkable composite was fabricated by foam coating fluorinated ethylene propylene/polytetrafluoroethylene emulsion on the surface of glass-fiber woven fabrics, followed by the water evaporation and porous layer formation process. And the corresponding properties such as pore size and distribution, air permeability, and morphology were investigated as well as the characterization of foaming agent, like thickening additive, drying temperature, and time. The mechanism of porous structure of the composite was discussed. The fastness of the fluorinated ethylene propylene/polytetrafluoroethylene foam coating composite was investigated in comparison with expanded polytetrafluoroethylene membrane-laminated filters. This may help pave the way for another novel high-temperature gas flue filter with long-term and ultra-low emission performance.