摘要
以3-氯丙基三乙氧基硅烷为端基改性剂,制备了氯端基化的纳米SiO_(2)(CTNS),再引入三聚氰胺作为腐蚀抑制剂,通过共价键的进一步修饰接枝到CTNS表面上,制备了三聚氰胺改性纳米SiO_(2)复合材料(MCTNS),将MCTNS与水性环氧树脂(WEP)共混制备了水性环氧(MCTNS/WEP)涂料,将MCTNS/WEP涂料涂敷Q235钢板形成了MCTNS/WEP涂层。采用FTIR、TGA、XPS对MCTNS进行了表征,通过SEM、TGA、冲击和附着力实验对MCTNS/WEP涂层的微观形貌、热稳定性和物理性能进行了测试,探究了MCTNS添加量对MCTNS/WEP涂层防腐性能的影响。结果表明,添加水性环氧树脂和水性环氧固化剂总质量1.0%的MCTNS时,制备的MCTNS/WEP_(2)涂层附着力为0级、硬度为3H、耐冲击为45 kg·cm、吸水率为4.28%、水接触角为93.5°;与WEP涂层相比,MCTNS/WEP_(2)涂层腐蚀电流密度从9.13×10^(-5) A/cm^(2)减至8.13×10^(-6) A/cm^(2),腐蚀电位从–0.597 V增至–0.248 V,缓蚀效率可达97.5%,盐雾实验30 d后涂层仍能保持光滑完整。MCTNS可以与WEP中的环氧基团反应形成共价键,改善SiO_(2)与环氧基体的相容性,增加涂层的交联密度,又能填补环氧涂层的缺陷,避免腐蚀介质的直接侵蚀。
Chloro-terminated SiO_(2)(CTNS)was synthesized using chloropropyl triethoxysilane as end-group modifier,and was covalently bonded with melamine as corrosion inhibitor,to prepare melamine modified nano-silica composites(MCTNS),which was characterized by FTIR,TGA and XPS,and then blended with waterborne epoxy resin(WEP)to obtain waterborne epoxy(MCTNS/WEP)composite coating materials.The MCTNS/WEP coating materials were further applied to Q235 steel plate to form MCTNS/WEP coatings,which were characterized by SEM,TGA,impact and adhesion experiments for analyses on the microstructure,thermal stability and physical properties.Moreover,the influence of MCTNS addition amount on the anti-corrosion performance of MCTNS/WEP coating were evaluated.The results showed that the MCTNS/WEP_(2)coating,prepared from MCTNS with a total mass of 1.0%waterborne epoxy resin and waterborne epoxy curing agent,exhibited an adhesion grade of 0,a hardness of 3H,an impact resistance of 45 kg·cm,a water absorption of 4.28%,and a water contact angle of 93.5°.Compared with those of WEP coating,the corrosion current density of MCTNS/WEP_(2)coating decreased from 9.13×10^(-5)A/cm^(2) to 8.13×10^(-6) A/cm^(2),the corrosion potential increased from–0.597 V to–0.248 V,the corrosion inhibition efficiency reached 97.5%,and the coating remained smooth and intact after 30 d of salt spray test.MCTNS could react with epoxy groups in WEP to form covalent bonds,thus improving the compatibility of SiO_(2)and epoxy matrix,increasing the cross-linking density of coating,and filling the defects of epoxy coating to avoid direct erosion of corrosive media.
作者
童庆玲
黄小庆
杨建军
吴庆云
吴明元
张建安
刘久逸
TONG Qingling;HUANG Xiaoqing;YANG Jianjun;WU Qingyun;WU Mingyuan;ZHANG Jian'an;LIU Jiuyi(Anhui High Performance Engineering Laboratory of Water-Based Polymer Materials,College of Chemistry and Chemical Engineering,Anhui University,Hefei 230601,Anhui,China)
出处
《精细化工》
北大核心
2025年第9期1986-1993,2028,共9页
Fine Chemicals
基金
国家自然科学基金项目(51973001)
安徽省科技计划重点项目(1704a0902018)。
作者简介
童庆玲(1999-),女,硕士生,E-mail:1977428995@qq.com;联系人:杨建军(1960-),男,教授,E-mail:andayjj@163.com。
