無機/有機混成塗料製備與二維狹縫式塗佈計算流體力學數值模型開發

Inorganic Organic Hybrid Polymer Formation as Coating Materials and A Two-Dimensional CFD Model For Slot Die Coating

羅培凱(Pei-kai Luo)

指導教授 ： 張幼珍

元智大學/工程學院/化學工程與材料科學學系/碩士(2009年)

摘要

本論文內容主要包括：(1)狹縫式塗佈技術理論的文獻回顧、以CFD軟體－Fluent－發展一個二維狹縫式塗佈理論模型、以及利用研究中發展出的理論模型所得到的定性模擬結果；(2)無機有機塗佈液合成實驗研究。在第一部分的理論模擬中，理論模型的建構係參考Chu et al.(2006)的模擬系統，模擬參數包括質量流率、動態與靜態接觸角、以及分離角。從模擬案例中可知，動態接觸角為150?時無法成膜；動態接觸角降為90?時則可成膜；然而，質量流率太低則可能形成不連續膜層，成膜需要適當的質量流率；然質量流率太高時，會導致上游處塗佈液與基材間形成接近180?接觸角；液珠下游塗佈液離開噴嘴後呈現的水平波動，可能是導致橫向波與氣泡滲入現象的原因。在第二部份的塗佈液合成方面，本研究成功合成出硬度3H以上、撓曲度可達5cm直徑、透光度可達90%的塗佈液配方，研究中發現Si：Al的莫耳比例對乾膜硬度的影響比乾燥溫度相當顯著

關鍵字

狹縫式塗佈、計算流體力學、理論模擬、無機有機塗佈液, 動態姐接觸角

並列摘要

This study involves two parts: (1) an experimental study to derived inorganic-organic polymer coating fluid formulation via sol gel system and it dry film analysis results such as FTIR and UV visible spectroscopy ; (2) a slot die coating theoretical work related literature review, the development of a two-dimensional computational fluid dynamics model (CFD model) using the commercial CFD package-FLUENT, as well as qualitative results obtained from simulations using the model developed in this study. The simulation model is refers to Chu et al (2006). The simulation results shows that no film formation on moving substrate with dynamic contact angle as high as 150∘and the film formatted on the substrate when dynamic contact angle reach 90∘or bellow . An appropriated inlet flow mass flow rate needed for the continuous film formation, too low mass flow rate may leads to contact angle between coating liquid and substrate at the upstream (static contact angle) approach to 180∘, while air entrainment easy to occur in this static contact angle condition. In the second part of this study, coating formulations with cured films exhibiting characteristics including a 3H and above hardness, a deflection reaching 5cm in diameter, and transmittance of 90% were found. Particularly, the Si-to-Al molar ratio appears to have dramatic influence on the hardness of the cured films.

並列關鍵字

slot die coating, computational fluid dynamics, theoretical modeling,

參考文獻

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