摘要
采用硅烷偶联剂KH-570在酸性条件下对纳米SiO_2表面进行改性,并利用动态激光散射仪(DLLS)、透射电镜(TEM)、红外光谱(FTIR)等测试方法对改性后纳米SiO_2的表面结构进行了分析表征.并研究了改性纳米SiO_2对纯丙烯酸酯水性乳液外墙涂料的力学性能和耐洗刷性能影响.由红外光谱分析可知,硅烷偶联剂KH-570成功改性纳米二氧化硅粒子,改性后的纳米二氧化硅粒径降至78nm,团聚现象也明显减少.当改性纳米二氧化硅含量为10%时,涂膜表面水接触角增加到71°,吸水率降至14.01%,拉伸强度为0.71 MPa,HD硬度升至0.53,耐洗刷测试分析也表明涂膜的耐洗刷性能得到了明显提高.
The surface of nano-SiO2 particles was modified with silane coupling agent 3-（methacryloyloxy）propyltrimethoxysilane （KH-570）under acidic condition.The surface structure of the modified nano-SiO2 was investigated by dynamic laser light scattering （DLLS）,fourier transform infrared spectroscopy （FTIR）and transmission electron micro-scope （TEM）.Meanwhile,the effects of modified nano-SiO2 content to mechanical properties and washability performance of paint for exterior wall were studied.FTIR spectrum showed that,silane coupling agent KH-570 successfully modified nano-SiO2 particles,and modified nano-SiO2 particle size down to 78 nm,agglomeration also decreased significantly,when the nano-SiO2 content was 10%,the water contact angle of film surface was increased to 71°,and its water absorption also was reduced to 14.01%,and the tensile stress was rised to 0.71 MPa.Moreover,the analysis of washability test showed that the addition of nano-SiO2 im-proved washability performance of the latex film significantly.
出处
《陕西科技大学学报（自然科学版）》
2016年第3期111-115,共5页
Journal of Shaanxi University of Science & Technology
基金
国家自然科学基金项目(51373091)
陕西科技大学博士科研启动基金项目(BJ12-08)
陕西科技大学学科人才培养计划项目(XSGP201212)
