LED 戶外看板的新型底部防潮披覆膜之研究與探討

Moisture-Proof Cladding Coatings for LED Outdoor Billboards

常宸堉(Chen-Yu Chang)

指導教授 ： 張淑美

國立臺北科技大學/工程學院/有機高分子研究所/碩士(2013年)

https://doi.org/10.6841/NTUT.2013.00050

摘要

本研究是使用環氧與聚甲基矽氧烷(Methyl silesquioxane)共聚Oligomer，分別以Oligomer的epoxy端基與分枝端甲氧基做為網狀分子的交聯點, 再分別選擇silane與amine有機胺分子,做為固化劑。Silane 分子是利用溶膠凝膠法與Oligomer分支構成Si-O-Si無機為主網絡,而amino有機胺官能基與環氧樹脂端基構成一級胺與醚化反應為主有機網絡。再透過FTIR ,TGA,沸水煮,水接觸角CA, Mocon(水氣穿透儀)等測試探討膜層中水氣穿透度與Si-O-Si網絡完整度、CA(contact angle)、Si-OCH3殘留程度彼此的關係。
實驗結果顯示使用低環氧當量的Oligomer ,對於有機反應為主的網絡與無機反應為主的網絡,其熱裂解溫度與類梯型樹脂形成均隨硬化劑比例增加而增加,另外Si-OCH3殘留越多,網絡交聯度越低,水氣殘留越多。一級胺殘留越多,戶外黃變性越高。最後, 總結出當使用比例為24% wt 的T-403時, 其綜合性能均最佳 , 並可同時改善EPOXY,PU 型披覆膜發生黃變與耐熱性差等問題 。

關鍵字

LED ； 戶外看板 ； 防潮披覆 ； 防腐蝕 ； 環氧聚矽氧烷

並列摘要

The lifetime of LED outdoor billboards is depended on the process of encapsulation to prevent oxygen and water corrosion. Current commercial process is adopted two layers coating upon LED modules in which liquid Epoxy is used as the primer paint due to its adhensiveness and PU or Acrylic paint is used as the weather resistant finish. However, the process is not only cost more and also the risk of volatile organic compounds (VOCs) emitted such as isocyanates. It is urgent needed to develop new outdoor protective coating. Among the material developed, organic-inorganic hybrid compositions have showed most promising, though the keypoint is the uniformity of two different type materials mixing. The mixing problem could be solved by applyling one component oranic-inorganic hybrid material. Therefore, in this study, hybrid materials, polysiloxane grafted epoxy resins were studied. Polymer films of Epoxy/siloxane resins reacted with varied ratio of coupling agents, 3-aminopropyl triethoxysilane and polyetheramine were characterized by FTIR, thermogravimetric analyzer (TGA), water permeability test, salt spray test.

並列關鍵字

LED ； outdoor billboards ； moisture-proof coated ； corrosion resistant ； epoxy polysiloxane

參考文獻

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