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为提高膜的抗污染能力,对聚偏氟乙烯(PVDF)平板膜进行表面涂覆改性,得到超疏水PVDF平板膜,再将超疏水PVDF平板膜进行表面亲水化改性,制备出超疏水/亲水复合PVDF膜。当PVDF的质量浓度为2%、聚乙二醇(PG)的质量浓度为39%、涂敷液温度为50℃、蒸发时间为10s、凝固浴温度为60℃时,超疏水PVDF平板膜接触角达到154.8°。表面亲水改性制得的PVDF超疏水/亲水复合膜的接触角为41°。然后研究了超疏水PVDF平板膜和PVDF超疏水/亲水复合膜的抗膜污染性能。结果显示,超疏水PVDF平板膜具有优良的抗无机污染性能和一定的抗有机污染性能;PVDF超疏水/亲水复合膜不仅具有优良的抗无机污染性能,而且其抗复合污染性能尤其是抗有机污染性能得到明显提升,为进一步构建高性能膜蒸馏抗污染膜提出了一个可行的技术方向。
In order to improve the anti-pollution ability of the membrane, PVDF flat membrane was surface-coated and modified to obtain super-hydrophobic PVDF flat membrane, and the superhydrophobic PVDF flat membrane was hydrophilized on the surface to prepare ultra-fine Hydrophobic / hydrophilic composite PVDF membrane. When the mass concentration of PVDF is 2%, the mass concentration of polyethylene glycol (PG) is 39%, the temperature of coating solution is 50 ℃, the evaporation time is 10s and the coagulation bath temperature is 60 ℃, The angle reached 154.8 °. The contact angle of PVDF superhydrophobic / hydrophilic composite membrane prepared by hydrophilic modification was 41 °. Then the anti-fouling properties of superhydrophobic PVDF plate membrane and PVDF superhydrophobic / hydrophilic composite membrane were studied. The results showed that the superhydrophobic PVDF plate membrane has excellent anti-inorganic pollution performance and certain anti-organic pollution performance; PVDF super-hydrophobic / hydrophilic composite membrane not only has excellent anti-inorganic pollution performance, and its anti-compound pollution performance, especially anti-organic Pollution performance has been significantly improved, in order to further build high-performance membrane distillation anti-pollution film proposed a viable technical direction.