聚脲复合涂层材料的改性和耐老化性能研究

摘要

涂刷防护修补涂层材料能够屏蔽腐蚀介质进入水工混凝土内部,提高水工混凝土耐久性.针对西部高寒地区高强度紫外线、冻融频繁的特殊气候水文环境,对已研发的聚天冬氨酸酯聚脲进行改性,复掺纳米TiO2材料和抗老化剂,并适量添加分散剂、消泡剂、硅烷偶联剂等,制得高耐候聚脲复合涂层材料.试验表明,其耐紫外老化性能较之聚天冬氨酸酯聚脲得到了极大提升,同时,该材料具有优异的粘结性能、韧性、低温柔性,符合西部高寒地区水工防护修补材料的基本性能要求.%The protection repair coating materials can prevent corrosion medium into hydraulic concrete and improve the durability of hydraulic concrete.Against the special climate and hydrological environment of high intensity ultraviolet radiation and frequent freeze-thaw cycle in western alpine-cold region of China,the developed polyaspartate polyurea is modified by mixing nano TiO2,anti-aging agent,moderate dispersing agent,defoamer and silane coupling agent.Comparing with polyaspartate polyurea,the anti ultraviolet ageing performance of this polyurea composite coating material is improved,and its bonding property,toughness,low temperature flexibility are excellent,which can meet the basic requirements of protection repair coating materials in western alpine-cold region.