论文部分内容阅读
采用溶胶-凝胶法,通过正硅酸乙酯(TEOS)水解缩合反应制备出纳米二氧化硅,通过硅烷偶联剂乙烯基三乙氧基硅烷(A-151)对SiO2粒子进行表面改性后,以丙烯酸(AA)和甲基丙烯酸甲酯(MMA)对纳米SiO2进行包覆反应,进行二次改性,最终得到稳定的纳米SiO2分散液。通过透射电镜(TEM)、红外光谱(IR),热重分析仪(TGA)等手段,对产品进行了表征,并将此SiO2分散液应用到WPUA(水性丙烯酸-聚氨酯)乳液的制备,得到了稳定的SiO2-PUA复合乳液。经检测,该纳米复合材料的涂膜性能得到一定的提高。
Nanosilica was prepared by hydrolysis-condensation reaction of tetraethoxysilane (TEOS) by sol-gel method. The SiO2 particles were surface-modified by the silane coupling agent vinyltriethoxysilane (A-151) After coating the nano-SiO2 with acrylic acid (AA) and methyl methacrylate (MMA), the nano-SiO2 is subjected to secondary modification to finally obtain a stable nano-SiO2 dispersion. The product was characterized by transmission electron microscopy (TEM), infrared spectroscopy (IR) and thermogravimetric analysis (TGA). The SiO2 dispersion was applied to the preparation of WPUA (waterborne acrylic-polyurethane) emulsion. Stable SiO2-PUA composite emulsion. After testing, the coating properties of the nanocomposites have been improved.