空气过滤用高容尘膨体聚四氟乙烯复合材料的制备及其性能

为提高膨体聚四氟乙烯(ePTFE)膜的容尘性能,拓展ePTFE膜复合材料在净化领域的应用,通过将不同厚度、不同纤维直径以及驻极处理后的聚丙烯熔喷过滤材料作为容尘层与ePTFE膜复合制备ePTFE复合材料,并对复合材料的容尘性能以及微观结构进行分析。结果表明:复合材料的容尘量随容尘层厚度增加呈线性增加趋势,容尘层厚度为0.45mm时,复合材料的容尘量达到6.37g/m²,较ePTFE膜提高了266%;复合材料的容尘量随容尘层纤维直径的减小呈增加趋势,容尘层纤维直径为1.462μm时,复合材料的容尘量达7.96g/m²,较ePTFE膜提高了357%;驻极处理后,容尘层纤维直径为3.611μm时,复合材料的容尘量较驻极处理前提高了136%。

Preparation and properties of expanded polytetrafluoroethylene membrane composites with high dust holding capacity for high efficiency air filtration

In order to improve the dust holding capacity of expanded polytetrafluoroethylene (ePTFE) membrane, and expand the application of ePTFE membrane composite materials in the field of clean room purification, polypropylene (PP) melt blown filter material with different thickness, fiber diameter and electret treatment was used as dust holding layer for the preparation of ePTFE membrane composite. The dust holding performance and microstructure of the composite were analyzed. The results show that the dust holding capacity of the composites increases linearly with the increase of the dust layer thickness. When the dust layer thickness is 0.45 mm, the dust holding capacity of the composite reaches 6.37 g/m², which is 266% higher than that of the ePTFE membrane. The dust holding capacity of the composite increases as the dust layer fiber diameter decreases. When the fiber diameter of the dust layer is 1.462 μm, the dust holding capacity of the composite increases to 7.96 g/m², which is 357% higher than that of the ePTFE membrane. After electret treatment, when the fiber diameter of the dust layer is 3.611 μm, the dust holding capacity of the composite increases by 136% compared with that before electret treatment.