GO/环氧丙烯酸涂层的制备及其在混凝土耐除冰盐腐蚀防护领域的应用

Preparation of GO/epoxy acrylic coating and application in corrosion resistance of concrete to deicing salt

以环氧树脂E-44和3种丙烯酸类单体为原料,采用原位聚合法引入不同掺量的改性氧化石墨烯(GO)(KH560-GO (KGO)和A151-GO (AGO)),得到GO改性环氧丙烯酸(WEP)乳液,加入适量填料及助剂制得KGO/WEP和AGO/WEP防腐涂料并制成复合涂层。结果表明:加入KGO或AGO均可提高WEP涂层的热稳定性;其中0.05wt%KGO/WEP的综合性能较优,该复合涂层的铅笔硬度为5H,冲击强度≥50 cm,粘结强度1.79 MPa,吸水率1.06%,接触角78.05°;紫外老化1000 h后,色差变化较小为0.75,光泽度保持较好为9.7;液体化学介质腐蚀240 h后,涂层形貌仍保持良好;涂层氯离子渗透量为0.34×10^(-3) mg/(cm^(2)·d)。将GO/WEP涂层涂装于混凝土砂浆试块表面,进行耐除冰盐冻融循环40次后,涂层和混凝土试块的测试结果表明:0.05wt%KGO/WEP涂层综合性能较好,腐蚀后的涂层粘结强度最大为1.91 MPa;砂浆试块的质量增长率为1.46%,6 h氯离子电通量为532 C,抗压强度损失率为18.2%。该复合涂层可有效提高混凝土基材表面的耐除冰盐腐蚀性,对道路养护水平的提升具有重要的研究意义。

AGO/WEP and KGO/WEP anti-corrosion coating was prepared,using epoxy resin E-44 and three acrylic monomers as raw materials,modified by different dosages of graphene oxide(KH560/GO(KGO),A151/GO(AGO))under in-situ polymerization method.The results show that the addition of KGO or AGO can both improve the thermal performance of the composite coating.The comprehensive performance of 0.05wt%KGO/WEP is better,the pencil hardness of the composite coating is 5H,the impact strength is more than 50 cm,the bonding strength is1.79 MPa,the water absorption rate is 1.06%,the contact angle is 78.05°,the color difference after 1000 h UV aging is0.75,the gloss is maintained well at 9.7,the coating morphology is maintained well after 240 h of chemical resistance,and the chloride ion permeability of the coating is 0.34×10^(-3) mg/(cm^(2)·d).The results show that the0.05wt%KGO/WEP coating has good comprehensive performance and a maximum bond strength is 1.91 MPa after40 salt freeze cycles.The mass growth rate is 1.46%,the chloride ion flux at 6 h is 532 C,the compressive strength loss is 18.2%.The composite coating can effectively improve the corrosion resistance of snow melting salt on the surface of concrete substrate,and has important research significance for improving the maintenance level of roads.