- 學位論文
親水性PU樹脂經溶膠製程應用於長效型玻璃防霧處理
Long-lasting Anti-fog Glass Treatment with Hydrophilic PU Resin via Sol-gel Process
摘要
本論文運用架橋型含有矽氧烷(silane)末端基的超親水性PU樹脂與微米或奈米級SiO2/TiO2粒子的混成系統，塗布於處理玻璃表面後，自行進行溶膠(Sol-Gel)反應製備玻璃表面具有耐磨擦的長效型防霧和自潔功能的塗佈。首先製備含異氰酸鹽端基的親水性(含聚乙醇)的PU預聚物，然後將兩末端同時含有silane和胺基之3-胺丙基三乙氧基矽烷((3-aminopropyl) triethoxysilane，以下簡稱APTES)加入異氰酸鹽末端基之PU預聚合物，APTES末端胺基與PU之異氰酸鹽在常溫下反應，形成含silane為末端基之親水性PU寡聚物。 玻璃表面分別經由鹼和酸處理及清水清洗乾淨後得玻璃表面的silanol (Si-OH)官能基，再與此親水性PU寡聚物的silane可產生Si-O-Si化學鍵結；最終分別加入四乙氧基矽烷(Tetraethoxysilane，以下簡稱TEOS)或是四丙鈦酸酯(tetra-butyl titanate，以下簡稱TBT)等，當作sol-gel親水性玻璃塗料系統中，分別可產生微米或奈米級 的SiO2或TiO2，不僅增加親水性塗料與玻璃表面的附著性，同時使得此親水性PU樹脂塗層更增加其親水性質，達到具有長效性防霧、等功能。本計畫將使用傳統親水性PU樹脂和sol-gel製程，並將利用掃描式電子顯微鏡(SEM)觀察微米或奈米級的SiO2或TiO2分布和反射式紅外光譜(ATR)探討樹脂與玻璃表面的化學鍵結；比較並分析微米或奈米級SiO2/TiO2粒子在親水性PU混成樹脂塗層的防霧效果。
關鍵字
親水性-PU並列摘要
A NCO-terminated PU prepolymer consists of carboxylic acid and polyethylene glygols is prepared. It is reacted further with a silane and amino-containing compound (amino-propyl triethoxysilane, APTES) and resulted in a silane-terminated PU oligomer formation. It functioned as a hydrophilic coating binder; An organo titanium compound (tetra-butyl titanate,TBT)is added into this silane-terminated PU oligomer and forming a sol-gel coating material. This sol-gel material is mixed with an ambient-temperature curing agent (TMPTA-AZ), It becomes an moisture- curable PU resin. And silane-terminal groups react with glass surface combining nano-TiO2 formation from TBT sol-gel process after moisture-curing. Both curing reactions provide a stable hydrophilic surface after coating on glass. This sol-gel coating process has the potential for long lasting anti-fog, stain-free glass coating applications.