- 學位論文
二氧化矽/高分子防霧鍍膜之製備與性質研究
Preparation and characterization of silica/ polymer antifogging coatings
摘要
本研究製備一抗霧塗膜，以無機單體四乙氧基矽烷(TEOS)，有機偶合劑γ-乙二醇氧基丙基三甲氧矽烷(GPS)，透過溶膠凝膠法在酸性環境中，製備出經由γ-乙二醇氧基丙基三甲氧矽烷改質二氧化矽表面的溶膠，利用此改質過後的二氧化矽表面之環氧基與咪唑化合物C11Z-A，以刮刀塗佈的方式在聚碳酸酯(PC)基板上熱硬化成膜，此層的功能除了增加基板與塗膜之間的密著性之外還有一重要目的為防止塗膜經由水分子的滲入而剝落。接著使用相同的方式在第一層塗膜表面製作第二層塗膜，此層的塗膜經由加入親水性基團(Tween80、Y-60、GMA+Y-60)而成為一抗霧塗膜。Tween80或Y-60部份，直接與溶膠摻混後熱硬化成膜；GMA+Y-60部份，將溶膠加入GMA與親水基團Y-60，先經由UV硬化使GMA和Y-60有接上，再經由熱硬化成膜。 實驗中調整不同的TEOS與GPS比例，期望找出與聚碳酸酯基板密著性良好且擁有高機械性質之塗膜；另一方面調整不同的親水基團含量，利用Tween80或Y-60與塗膜摻混或GMA+Y-60與塗膜 UV交聯的方式，探討抗霧的效果及耐候性。 實驗結果方面，可得知GPS確實有接在二氧化矽的表面，達到表面改質的目的，而製備出來的溶膠確實以奈米顆粒大小分散在溶劑中，而塗膜則沒有聚集的現象發生；而混成材料的熱性質、物理性質都會因為二氧化矽的添加量增加而有所提升；耐候性來說，與塗膜UV交聯的GMA+Y-60，比摻混Tween80或Y-60的好，證實了經由交聯的塗膜確實成功的達到改善耐候性的問題。
並列摘要
This research was to prepare an anti-fogging coating by the sol-gel method. In an acid environment, tetraethoxylsilane(TEOS) was used to form collidial silica by hydrolysis and condensation reaction, and then the colloidal silica was modified by reaction with the couple agent γ- glycidoxypropyltrimethoxysiline(GPS). This modified silica was mixed with imidazole(C11Z-A), and then cured at an elevated temperature to form a coating on a polycarbonate substrate. This primer coating seried as an adhesive layer to enhance the ability of the abhension on the substrate and also a hydrophilic layer to prevent water penetration. On top of the primer, a layer was coated, which contained hydrophilic species Y-60, Tween 80, or GMA+Y-60. to make this layer anti-fogging. For the cases of using Tween 80 or Y-60, mixed with the sol and then it was heat cured to form the antifogging coating. For GMA+Y-60 , before curing to form a coating, it was mixed with the sol, followed by UV irradiation to induce chemical reaction between GMA and Y-60. By adjusting the proportion of TEOS and GPS, we aimed to prepare a coating that exhibited good adhension on polycarbonate substrates and also had high mechanical strength. Also, by adjusting the proportion of the hydrophilic species, their effects on anti-fogging and water endurance were studied. The result showed that colloidal silica has been successfully modified by GPS. These nanoparticles dispersed homogeneous in the sol. Also, there is no sign of aggregation in the curried coatings. Silica could improve the thermal property and the physical property of the coatings. Regarding water endurance, these coatings with UV processing (GMA+Y-60) were more effective than those with simply blending (Tween80 and Y-60).