摘要
采用种子乳液聚合技术制备了nano-SiO2/丙烯酸酯核壳复合乳液,并以此乳液配制耐沾污外墙乳胶涂料。研究了nano-SiO2掺量和壳层丙烯酸酯聚合物玻璃化温度对乳液成膜和外墙涂料耐沾污性的影响。结果表明,相比较纯丙乳液和纯丙与胶体SiO2共混乳液,以nano-SiO2/丙烯酸酯核壳复合乳液配制的外墙乳胶涂料在漆膜致密性、硬度、耐水性、耐沾污性等方面都大大改善。SiO2最佳掺量为乳液配方总量的5%左右,高于此掺量,乳液的稳定性大大降低,漆膜变得硬而脆。随着壳层丙烯酸聚合物Tg的降低,乳液最低成膜温度显著降低,但漆膜耐沾污性也随之较大幅度降低。
A core-shell nano-SiO/polyacrylate composite emulsion was prepared by seed emulsion polymerization, and its application in high performance dirt pick-u Presistant exterior latex paints was discussed. The influences of nano-SiO2 amounts and glass transition temperature（Tg） of acrylate polymer in shell on the emulsion film-forming and dirt pick-u Presistance of exterior latex paints have been analyzed. The results show that, comfared with pure polyacrylate emulsion and its hybrid emulsion with silica sol, the properties of exterior latex paints prepared with core-shell nano-SiO2/polyacrylate composite emulsion are greatly improved in some aspects such as latex film compactness, hardness, water resistance and dirt pick-u Presistance. The optimum nano-SiO2 dosage in emulsion polymerization formulation is 5% or so. If its doasge is too high, the stability of emulsion is poor, and the latex film is hard and fragile. With the decrease of acrylate polymer Tg in shell, the minimum film forming temperature （MFFT） of composite emulsion is obviously dropped with a undesired decrease tendency of dirt pick-u Presistance of exterior latex paints.
出处
《重庆大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2007年第12期76-79,88,共5页
Journal of Chongqing University
关键词
核壳复合乳液
NANO-SIO2
外墙涂料
耐沾污性
core-shell
composite
emulsion
nano-SiO2
exterior latex paints
dirt pick-upresistance
