Membrane is a soft and flexible material, use a viscosity polymer coating on the outside or infiltrating the interface of textile. The architectural membrane has excellent value promote the development of this product. It’s characteristic include light transmittance、specific strength、low creep、self-clean、build fast. This study will work on the trend of energy and carbon reduces, decrease the air-conditioning electricity in membrane structure. This product was sandwich structure by glass fiber woven / micro-porous PU / glass fiber woven to obtain the property of water-vapor permeable and liquid-water impermeable. The glass fiber woven provide mechanical properties used PTFE to package it and to make self-clean.
The PTFE / glass fiber woven spray with two-stage of 70g/min, heat treatment at 240℃ have optimal property of hydrophobic and interface adhesion. The contact angle is 124° and not changes after 10 min, increase 50.06% than sample under 30g/min spray rate, wetting on 10sec; increase 6.05% than sample of 50g/min,complete wetting on 31sec. The weight of spray is 24.7 g/m2
The glass fiber / micro-porous PU / glass sandwich structure composite which with three-stage-coating with 300μm have well water-vapor permeable and liquid-water impermeable. The pressure values is 3080 mmH2O, increase 300.16% than sample of 30g/min; the water-vapor permeable is 834.7 g/m2．24hrs, decrease 300.16%. The average totally thickness is 695μm; Thickness of micro-porous PU is 120.54μm. Totally weight is 820.7g/m2; weight of micro-porous PU is 143.1g/m2. Width of porous between of 20-60 um, average is 32.98 um.
The water-vapor permeable and liquid-water impermeable membranes spray by twogstage of 70g/min, forming at 240℃ and composite which with three-stage-coating with 300μm have significant property in this paper. The pressure values is 3830mmH2O, increase 24.35% than composite by three-stage-coating with 300μm used glass fiber woven unsprayed PTFE. The water-vapor permeable is 495.1 g/m2．24hrs, decrease 40.68% than composite by three-stage-coating with 300μm used glass fiber woven unsprayed PTFE . The totally thickness is 701μm; Thickness of micro-porous PU is 150.07μm. Totally weight is 845.1g/m2; weight of micro-porous PU and PTFE is 167.5g/m2. Width of porous is about of 30-70 um, average is 50.61 um.
