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

• Main Authors: Pei-kai Luo, 羅培凱
• Other Authors: Yu-Chen Chang
• Format: Others
• Language: en_US
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/32051329592159641051

碩士 === 元智大學 === 化學工程與材料科學學系 === 97 === 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.