将纳米SiO2与γ-甲基丙烯酰氧乙基三甲氧基硅烷(KH570)反应得到双键改性的纳米SiO2(D-SiO2),再与甲基丙烯酸乙酯(EMA)、丙烯酸正丁酯(BA)、十二氟甲基丙烯酸甲酯(DFMA)和甲基丙烯酸缩水甘油酯(GMA)通过原位聚合反应得到纳米二氧化硅/含氟丙烯酸酯(纳米SiO2/SFPEA)。通过傅里叶变换红外光谱仪、热重分析仪、扫描电子显微镜、接触角测量仪、抗紫外老化试验等对纳米SiO2/SFPEA的结构和性能进行了表征。结果表明:纳米SiO2/SFPEA乳液性能稳定,平均粒径为159nm,吸水率为8%,水和油(二碘甲烷)接触角分别为116°和102°,热失重10%、30%、50%的热分解温度分别为383℃、408℃、418℃。紫外老化720h后,纳米SiO2/SFPEA胶膜光泽度为60%,光泽度损失率为26.8%,拉伸强度和断裂伸长率分别为15MPa和301%。纳米SiO2/SFPEA胶膜的疏水性能、抗紫外老化性能和热稳定性都得到明显提升。
The nano SiO2 modified by double bond (D-SiO2) was obtained by reacting the nano SiO2 with γ-methacryloyloxyethyltrimethoxysilane (KH570),then with ethyl methacrylate (EMA),n-butyl acrylate (BA),methyl dodecyl methacrylate (DFMA) and glycidyl methacrylate (GMA),the nano SiO2/fluoroacrylate (SFPEA) was obtained by in-situ polymerization.The structure and properties of the nano SiO2/SFPEA were characterized by FT-IR,TGA,SEM,contact angle and anti-UV aging test,etc.As a result,the nano SiO2/SFPEA emulsion had stable properties.The average particle size of the nano SiO2/SFPEA emulsion was 159nm.Water absorption was 8%,The contact angles of water and diiodomethane were 116° and 102°,respectively,the heat weight loss of 10%,30%,50% of the temperature 383,408,418℃,respectively.After 720 h UV aging,60% of the film gloss.The gloss loss rate was 26.8%,the tensile strength and elongation at break were 15MPa and 301%,respectively.Hydrophobic properties,anti-UV aging properties and thermal stability of the nano SiO2/SFPEA film were improved obviously.
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