PVDF/FEP/ZnO复合涂层的制备及防垢性能研究

Study on Preparation and Antiscaling Performance of PVDF/FEP/ZnO Composite Coatings

为了解决金属表面的结垢问题,以聚偏氟乙烯(PVDF)和聚全氟乙丙烯(FEP)为原料,通过添加不同含量的纳米ZnO制备了PVDF/FEP/ZnO复合涂层,研究了纳米ZnO添加量对复合涂层疏水性能和防垢性能的影响。通过接触角测量仪、扫描电子显微镜(SEM)和X射线粉末衍射仪(XRD)对涂层进行了表征。结果表明:纳米ZnO的添加量为5.0%(质量分数)时,PVDF/FEP/ZnO复合涂层的表面自由能为8.6 mJ/m^(2),水接触角为114.8°;PVDF/FEP/ZnO复合涂层在过饱和碳酸钙溶液中结垢336 h后,其表面的碳酸钙结垢量仅为环氧涂层的72%,且文石和球霰石的摩尔分数之和达到了91.4%,表明复合涂层具有优良的防垢性能,在防垢领域具有较好的应用前景。

For solving the scaling problem on the metal surface,by using polyvinylidene fluoride(PVDF)and polyperfluoroethylene propylene(FEP)as raw materials,the PVDF/FEP/ZnO composite coatings were prepared by adding different content of nano ZnO into PVDF and FEP.The effects of nano ZnO content on the hydrophobicity and antiscaling performance of the composite coatings were studied.In addition,contact angle measurement,scanning electron microscopy(SEM)and X-ray powder diffraction(XRD)were employed to characterize composite coating s systematically.Results showed that when the amount of nano ZnO was 5%(mass fracrion),the surface free energy of PVDF/FEP/ZnO composite coating was 8.6 mJ/m^(2),and the water contact angle(WCA)was 114.8°.After scaling in supersaturated calcium carbonate solution for 336 h,the scaling amount of CaCO_(3) on the surface of PVDF/FEP/ZnO composite coating was 72%of that of the epoxy coating,and the mole fraction of aragonite and aragonite reached 91.4%.In general,the PVDF/FEP/ZnO composite coating had excellent antiscaling performance,presenting a good application prospect in the field of antiscaling.