基于聚丙烯熔喷非织造材料的复合薄膜制备与液体分离性能

Preparation and Liquid Separation Properties of Composite Films Based on Polypropylene Melt-Blown Nonwovens

采用氧化石墨烯(GO)的N,N-二甲基甲酰胺(DMF)溶液对聚丙烯熔喷非织造材料进行改性处理,使其由疏水表面转换成亲水表面。将含GO的聚偏氟乙烯(PVDF)涂覆液刮涂在改性聚丙烯熔喷非织造材料表面制得复合薄膜。通过扫描电子显微镜对聚丙烯熔喷非织造材料和复合薄膜的形貌进行表征;利用接触角测试仪对材料表面亲疏性能进行测试;采用牛血清蛋白(BSA)溶液对复合薄膜的分离性能、截留性能和抗污染能力进行评估。结果表明:聚丙烯熔喷非织造材料经DMF浸泡处理,可将GO沉积在纤维表面。当GO含量为0.12 g时,制得的复合薄膜分离层厚度为14.5μm,水接触角为53.5°,对BSA溶液渗透通量高达103 L/(m2·h),对BSA溶液的截留率保持97.0%以上。经一轮污染模拟实验,复合薄膜的污染率低至13.4%,不可逆污染率为2.5%,展现优异的液体分离和抗污性能。

Polypropylene melt-blown nonwovens were modified by N,N-dimethylformamide(DMF)solution of graphene oxide(GO)to convert from hydrophobic surface to hydrophilic surface.The GO-containing polyvinylidene fluoride(PVDF)coating solution was scraped on the surface of modified polypropylene melt-blown nonwovens to prepare composite film.The morphology of polypropylene melt-blown nonwoven materials and composite films was characterized by scanning electron microscopy.The surface hydrophilicity of the material was tested by a contact angle tester.Bovine serum albumin(BSA)solution was used to evaluate the separation performance,rejection performance and anti-fouling ability of the composite film.The results show that GO can be deposited on the surface of polypropylene melt-blown nonwovens by soaking in DMF.When the addition amount of GO is 0.12 g,the separation layer thickness of the prepared composite film is 14.5μm,the water contact angle is 53.5°,the permeation flux of BSA solution is as high as 103 L/(m2·h),and the rejection rate of BSA solution is maintained above 97.0%.After a round of pollution simulation experiments,the pollution rate of the composite film is as low as 13.4%,and the irreversible pollution rate is 2.5%,showing excellent liquid separation and anti-fouling performance.