UV-Curable Poly (Urethane Acrylate)/Silica Hybrid Materials for Hard Coating Application

本研究探討紫外光可硬化聚胺酯壓克力樹脂/二氧化矽混成材料應用於硬型保護塗層，以期達到高硬度、高黏著力且高穿透度之性能。經由改變Tetraethoxysilane (TEOS)與3-(trimethoxysilyl) propylmethacrylate (MSMA)的莫耳比例所得到的二氧化矽粒子與與改變樹脂與二氧化矽的比例對塗層硬度、黏著力、熱性質與穿透度之影響。 無機粒子方面，利用溶膠-凝膠法所得到之二氧化矽粒子，粒徑為14奈米。經由MSMA改質後，使其表面帶有壓克力官能基，以晶鏡有機和無基見面的相容性，且粒徑最多增加至27奈米。傅立葉轉換紅外線光譜儀、和動態雷射光散射粒徑儀為此判斷的依據。 樹脂方面，本研究合成一系列胺酯壓克力樹脂，並與自行合成之二氧化系混合並加入I 184後得到紫外光可硬化聚胺酯壓克力樹脂/二氧化矽混成塗料，經由添加二氧化矽後，於PET基材上，數種配方的鉛筆硬度最高可達7H。胺酯壓克力中的胺酯鍵結，可以改善因為加入過多的二氧化矽造成黏著力下降之現象。由SEM可知MSMA的量對於二氧化矽於樹脂中的分散有很大的影響，在高二氧化矽添加量下，足夠的MSMA才能維持好的分散效果。In this study, a series of urethane acrylate/silica hbrid hard coating were developed. This coating was designed to be with performance of high pencil hardness, high adhesion and high transmittance. We could find the influences of the molar ratio of Tetraethoxysilane (TEOS) to 3-(trimethoxysilyl) propylmethacrylate (MSMA) and the weight ration of resin to silica on pencilhardness, adhesion, thermal property and transmittance. The silica particle were synthesized by sol-gel process. The size of silica particle was 14nm. The silica spheres weresuccessfully modified by MSMA, and the acrylate functional groups were chemically bonded tothe surface of silica spheres, in order to enhance the compatibility oforganic and inorganic interface. FT-IR and DLS were employed tocharacterize the modification of the silica spheres. A series of urethane acrylate resins were synthesized. The UV-curable poly (urethane acrylate)/silica hybrid hard coatings were composed of urethane acrylates , modified silica particles and I 184. By adding silica particle, some formulae of coating could reach 7H pencil hardness on PET substrate. The urethane linkage of urethane acrylates could improve the poor adhesion, which resulted from adding too much silica. By SEM, we could find the influence of the amound of MSMA on the dispersity of silica in resins. At hight loading of silica, it needed enough MSMA to make silica disperse well in hybrid materials