改性聚丙烯酸酯乳液的制备及聚合物水泥基涂层耐久性评价  

Preparation of Modified Polyacrylate Emulsion and Durability Evaluation of Polymer Cement-Based Coating

作　　者：卢烁 姜东兵 李琦琦 侯鹏坤[1,2] 荣辉 赵丕琪[1,2] LU Shuo;JIANG Dongbing;LI Qiqi;HOU Pengkun;RONG Hui;ZHAO Piqi(Shandong Provincial Key Lab of Preparation and Measurement of Building Materials,University of Jinan,Jinan 250022,China;School of Materials Science and Engineering,University of Jinan,Jinan 250022,China;School of Materials Science and Engineering,Tianjin Chengjian University,Tianjin 300192,China)

机构地区：[1]济南大学,山东省建筑材料制备与测试技术重点实验室,济南250022 [2]济南大学材料科学与工程学院,济南250022 [3]天津城建大学材料科学与工程学院,天津300192

出　　处：《硅酸盐学报》2023年第11期2857-2867,共11页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金(52172021);国家重点研发计划(2021YFB 3802002);山东省优秀青年科学基金(ZR2023YQ041);山东省自然科学基金(ZR2021ME123);泰山学者计划;山东省高校青年科研人员科技创新支持计划(2019KJA017)。

摘　　要：水泥基涂层疏水化改性处理是提高其防护效果的有效途径,然而有机硅烷类疏水性材料存在分散性差、弱化涂层物理性能及耐久性的问题。以含羟基聚二甲基硅氧烷为第二油相(PDMS),采用一步法高速剪切乳化工艺实现了高稳定/疏水型改性聚丙烯酸酯乳液的制备,并进一步构建了高耐久聚合物水泥基防护涂层。研究结果表明:相匹配的PDMS分子量、掺量、剪切速率可获得兼具良好稳定性和疏水性的改性乳液,乳液30 d未见分层现象、乳胶膜接触角提高24.9%、吸水率降低28.94%;制备的聚合物水泥基涂层展现了优异的力学性能、疏水性、耐紫外老化、耐海水和碱溶液浸泡性能,氯离子渗透系数仅为0.193×10^(–6)mm^(2)/s;分析了乳液的改性机理与涂层耐久性增强机制。Hydrophobic modification of cement-based coating is beneficial to improving its protective effect,but it leads to poor dispersion of coating,weakening of physical properties and durability of coating.In this paper,a highly stable/hydrophobic modified polyacrylate emulsion was prepared by using hydroxy-containing polydimethylsiloxane(PDMS)as a second oil phase,and a high durability polymer cement-based protective coating was further constructed.The modified emulsions with good stability and hydrophobicity can be obtained by matching the molecular weight and dosage of PDMS and emulsifying the shear rate.Little stratification occurs after 30 d,the contact angle of latex film is increased by 24.9%,and the water absorption is decreased by 28.94%.The prepared polymer cement-based coating has superior mechanical properties,hydrophobicity,UV aging resistance,seawater and alkali immersion resistance,and the chloride ion permeability coefficient is only 0.193×10^(–6)mm^(2)/s.In addition,the modification mechanism of emulsion and the durability enhancement mechanism of coating were also analyzed.

关 键 词：聚丙烯酸酯 聚二甲基硅氧烷 水泥基涂层 耐久性 海工混凝土防护 

分 类 号：TU525[建筑科学—建筑技术科学]