共价功能化碳化硅-磺化聚苯胺/环氧树脂防腐复合涂层的制备及防腐性能

Preparation and anticorrosive performance of covalently functionalized silicon carbidesulfonated polyaniline/epoxy resin anticorrosive composite coating

聚合物/无机物纳米复合材料由于其独特的性能成为目前材料研究的热点之一。为得到疏水性能及防腐性能俱优的碳化硅(SiC)防腐复合涂层材料,利用硅烷偶联剂(KH-550)对碳化硅(SiC)纳米粒子进行氨基化处理,然后以苯胺、氨基苯磺酸和氨基化SiC纳米粒子为原料,通过一步法氧化聚合反应合成共价功能化碳化硅-磺化聚苯胺(SiC-NH_(2)-SPANI)复合材料,采用FT-IR、UV-vis、XRD和SEM对复合材料的微观结构和形貌进行表征分析。最后通过喷涂法将SiC-NH_(2)-SPANI复合涂层材料涂覆于基材上并对其进行性能测试,主要研究涂层的疏水性能和防腐性能;并探讨了不同SiC纳米粒子和过硫酸铵(APS)的反应量以及复合材料加入量对共价功能化碳化硅-磺化聚苯胺/环氧树脂(SiC-NH_(2)-SPANI/EP)防腐复合涂层的影响。研究结果表明,加入质量分数为3wt%SiC-NH_(2)-SPANI的复合涂层具备较优的疏水性能,接触角(CA)值达到99.87°。SiC纳米粒子和过硫酸铵反应量对涂层防腐性能研究结果表明,当SiC-NH_(2)用量为15wt%时,采用过硫酸铵与含氨基单体(苯胺和氨基苯磺酸)摩尔比为1∶1时所制备的SiC-NH_(2)-SPANI/EP涂层的防腐性能最好。掺杂不同材料的复合涂层(SiC/EP、SiC-NH_(2)/EP和SiC-NH_(2)-SPANI/EP)中,SiC-NH_(2)/EP涂层的接触角最大,疏水性能最好,防腐性能表现最好。由此也说明涂层疏水性能与防腐性能存在关系,疏水性能越好,防腐性能越好。随浸泡时间增加,质量分数为3wt%SiC-NH_(2)-SPANI/EP复合涂层展现出更优异的长期稳定性和防腐性能。

Polymer/inorganic nanocomposites have attracted extensive research interests due to their unique properties.In order to obtain SiC composite coating material with excellent hydrophobic and anticorrosive performance,silicon carbide(SiC)nanoparticles were ammoniated by silane coupling agent(KH-550),and then the covalently functionalized SiC-sulfonated polyaniline(SiC-NH_(2)-SPANI)composites were synthesized by one-step oxidative polymerization of aniline,aminobenzenesulfonic acid and aminated SiC nanoparticles,the microstructure and morphology of the composites were characterizated by FT-IR,UV-vis,XRD and SEM.Finally,the SiC-NH_(2)-SPANI epoxy coating was coated on the substrate by spraying method and the hydrophobic and anticorrosion performance of the prepared coating was studied.The effects of the amount of different SiC nanoparticle,ammonium persulfate and the amount of the composite materials on the covalently functionalized silicon carbide sulfonated polyaniline/epoxy resin anticorrosive composite coating(SiC-NH_(2)-SPANI/EP)was investigated.The results of hydrophobic property show that the contact angle value of the composite coating with 3wt%SiC-NH_(2)-SPANI reaches 99.87°,which is higher than that of the composite coating that used the pristine SiC substituted for SiC-NH_(2).With regard to the influence of different reaction amount of SiC and ammonium persulfate,the anticorrosion performance of SiC-NH_(2)-SPANI/EP is the best when the mass ratio of 15wt%SiC-NH_(2) to ammonium persulfate(APS)is 1:1.Among the composite coatings doped with different materials(SiC/EP,SiC-NH_(2)/EP and SiC-NH_(2)-SPANI/EP),the SiC-NH_(2)/EP coating has the largest contact angle,the best hydrophobic performance and anticorrosion performance.It also shows that there is a relationship between hydrophobic property and anticorrosion property and the hydrophobic performance is directly proportional to anticorrosive performance.With regard to the influence of the content of composite coatings,the long-term stability and corrosion resistance are more excellent when the addition of SiC-NH_(2)-SPANI/EP is 3wt%.