聚四氟乙烯覆膜滤料滤膜耐喷吹性能研究

Investigation on blowout resistance performance of PTFE membrane coated filter materials

通过脉冲喷吹试验对比4种聚四氟乙烯(PTFE)覆膜滤料脉冲喷吹前后的膜破损率和透气率,评估覆膜滤料滤膜性能。结果表明:PTFE膜的厚度与微细纤维密度呈正相关,孔径大小与膜厚度呈负相关。在PTFE膜复合到聚苯硫醚(PPS)滤料表面后,厚度较大的PTFE膜不容易变形,因此受脉冲喷吹影响较小,具有更长的使用寿命;较薄的PTFE膜容易被拉伸,脉冲喷吹后破损严重,使用寿命较短。并指出,脉冲喷吹试验可用于评估覆膜滤料滤膜的耐久性及可靠性。试验结果可为PTEF膜厚度的选择提供有效参考。

The membrane breakage rate and air permeability of four kinds of polytetrafluoroethylene(PTFE)membrane coated filter materials before and after pulse injection test were compared to evaluate the membrane performance of membrane coated filter materials.The results showed that,the thickness of PTFE membrane was proportional to the density of microfibres,and the pore size was inversely proportional to the membrane thickness.After the PTFE membrane was laminated onto the polyphenylene sulfide(PPS)filter material,the thicker PTFE membrane was not easily deformed,so it was less affected by pulse injection and had a longer service life.On the contrary,the thinner PTFE membrane was easy to be stretched,and it was severely damaged by pulse injection and had a shorter service life.It was pointed out that the pulse injection test could be used to evaluate the durability and reliability of the membrane.The test results could provide an effective reference for the selection of PTEF membrane thickness.