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研究了一次刮膜形成偶联层的涂覆液组成与刮膜厚度以及二次刮膜铸膜液的配方与成膜工艺,利用扫描电子显微镜(SEM)、X射线光电子能谱仪(XPS)等对制备的膜组成及结构进行了表征。首先通过聚合物共混相容性实验筛选出聚甲基丙烯酸甲酯(PMMA)作为支撑层聚酯无纺布与聚偏氟乙烯(PVDF)铸膜液之间的偶联层聚合物,确定一次刮膜涂覆液中PMMA的质量分数为12%,刮膜厚度为20μm;然后优化确定了二次刮膜铸膜液配方NMP/PVDF/PMMA/PVP质量比为74/16/4/6。经二次刮膜法制备的聚偏氟乙烯平板复合超滤膜机械强度高,抗反洗能力强,主体材料为PVDF,在0.1 MPa条件下纯水通量稳定在628.1 L/(h·m~2),接触角为53.7°,用于实际石化废水处理运行1个月膜平均产水通量约为68.3 L/(h·m~2),产水浊度基本稳定在0.2~0.6 NTU之间,膜表面污染物较少,抗污染能力强。
The composition and the thickness of the coating solution of the coupling layer formed by the scraping film and the formulation and film forming process of the secondary wiping film casting solution were studied. The scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) The prepared membrane composition and structure were characterized. Firstly, the coupling polymer of PMMA as support layer polyester non-woven fabric and polyvinylidene fluoride (PVDF) casting solution was screened through the compatibility experiment of polymer blends. The mass fraction of PMMA in the film-coating solution was 12% and the film thickness was 20μm. Then the NMP / PVDF / PMMA / PVP mass ratio of the secondary scratch film casting solution was optimized to be 74/16/4/6 . The polyvinylidene fluoride (PVDF) plate composite ultrafiltration membrane prepared by the secondary scraping membrane method has high mechanical strength and strong anti-backwash capability, and the main material is PVDF. The pure water flux at 62 MPa is stable at 628.1 L / (h · m ~ 2) and the contact angle is 53.7 °. The average water flux for one month of actual petrochemical wastewater treatment is about 68.3 L / (h · m ~ 2) and the turbidity of water production is basically stable at 0.2-0.6 NTU Between the membrane surface less pollutants, anti-pollution ability.