改性g-C_(3)N_(4)掺杂聚氨酯涂层的制备及其耐腐蚀性能研究

Preparation and corrosion resistance of modified g-C_(3)N_(4) doped polyurethane coating

通过硅烷偶联剂(OTS)对g-C_(3)N_(4)改性,将改性g-C_(3)N_(4)与聚氨酯共混后制备出改性g-C_(3)N_(4)/聚氨酯复合材料,研究不同质量分数的改性g-C_(3)N_(4)对改性g-C_(3)N_(4)/聚氨酯复合材料的耐腐蚀等性能的影响。利用红外光谱、X射线衍射能谱、X射线光电子能谱、粒径分析对g-C_(3)N_(4)的结构和性能进行了表征,同时利用接触角分析、扫描电镜、透射电镜、以及电化学对复合材料的形貌和性能进行了一系列的表征。结果表明,g-C_(3)N_(4)改性后分散性增强,平均粒径由682 nm降低为118 nm;改性g-C_(3)N_(4)掺杂使聚氨酯疏水性增强,接触角提高25°;改性g-C_(3)N_(4)/聚氨酯复合材料的耐腐蚀性能随着改性g-C_(3)N_(4)质量分数的增加,呈现先增大后减小的趋势,当改性g-C_(3)N_(4)质量分数为3%时,复合材料的耐腐蚀性能提升最大,耐酸性可提升58.74%,耐碱性可提升46.34%。

The modified g-C_(3)N_(4)/polyurethane composite is prepared by blending the modified g-C_(3)N_(4) and polyurethane through the modification of g-C_(3)N_(4) by silane coupling agent(OTS).The effects of different mass fractions of modified g-C_(3)N_(4) on the corrosion resistance and other properties of modified g-C_(3)N_(4)/polyurethane composite are studied.The structure and properties of g-C_(3)N_(4) are characterized by FT-IR,XRD,XPS and particle size analysis.Meanwhile,the morphology and properties of g-C_(3)N_(4) composite are characterized by contact angle analysis,scanning electron microscopy,transmission electron microscopy and electrochemistry.The results show that the dispersion of g-C_(3)N_(4) is enhanced after modification,and the average particle size decreases from 682 nm to 118 nm.The modified g-C_(3)N_(4) doping enhances the hydrophobicity of polyurethane and increases the contact angle by 25°.The corrosion resistance of the modified g-C_(3)N_(4)/polyurethane composite increases first and then decreases with the increase of the mass fraction of modified g-C_(3)N_(4).When the mass fraction of modified g-C_(3)N_(4) is 3%,the corrosion resistance of the composite increases by 58.74%and 46.34%,respectively.