纳米SiO2溶胶改性水性氟碳涂料的制备及用于混凝土防腐研究  

Preparation and application of nano-SiO sol modified waterborne fluorocarbon coating in concrete anti-corrosion

作　　者：宋莉芳[1] 张婷 霍慧文 吕昕 陈华鑫[1] Song Lifang;Zhang Ting;Huo Huiwen;Lu Xin;Chen Huaxin(School of Materials Science and Engineering,Chang'an University,Xi'an 710061)

机构地区：[1]长安大学材料科学与工程学院,西安710061

出　　处：《化工新型材料》2020年第8期294-298,共5页New Chemical Materials

基　　金：陕西省工业科技公关项目(2016GY222);西安市科技厅计划项目(2017137SF/WM031)。

摘　　要：选用硅烷偶联剂(KH-560)改性纳米SiO2溶胶,然后将其与含氟聚丙烯酸酯乳液、成膜助剂醇酯-12、适量颜填料及其他助剂混合制备复合乳液。运用Zetasizer Nano仪器、傅里叶变换红外光谱表征改性后纳米SiO2溶胶的粒径大小及结构,并运用热重分析、扫描电镜、动态接触角等手段对复合涂层的热稳定性、形貌和疏水性进行表征。将其涂覆于混凝土砂浆试件,进行各项性能测试。结果表明:采用纳米SiO2溶胶(掺量为20%时)改性含氟丙烯酸乳液时,复合涂层的附着力为1.92MPa,铅笔硬度为5H,耐冲击强度最大可高于50cm,耐酸碱盐腐蚀率分别为16%、11%、10%,耐老化性色差为0.5,接触角为103.57°,吸水率为0.75,适用于腐蚀环境下混凝土的长效防护。Nano-SiO2 sol was modified byγ-(2,3-epoxypropoxy)propytrimethoxysilane(KH-560),and then it was combined with fluorinated acrylate emulsion,alcohol ester-12 as filming additive,proper amount of pigment filler and other additives to make into a composite coating.The particle size and the structure of the SiO2 sol modified by KH-560 were measured by zetasizer nano instrument and fourier transform infrared spectroscopy.The thermal stability,morphology and hydrophobicity of the coating were measured by thermogravimetric analysis,scanning electron microscopy and dynamic contact angle.It was applied to a concrete mortar test piece for various performance tests.The results shown that when the nano-SiO2 sol(the dosage was 20%)was used to modify the fluorine-containing acrylic emulsion,the adhesion of the coating was 1.92 MPa,the pencil hardness was 5 H,the impact strength was up to 50 cm,the corrosion resistance of acid and alkali salts was 16%,11%,10%,the aging resistance was 0.5,the contact angle was 103.57°,and the water absorption was 0.75,which was suitable for long-term protection of concrete in corrosive environment.

关 键 词：纳米SiO2溶胶 混凝土涂层防腐 含氟丙烯酸乳液 水性氟碳涂料 

分 类 号：TQ638[化学工程—精细化工]