聚合物涂层液固化过程中溶剂扩散的数值模型  

Numerical Simulation on Solvent Diffusion during Polymeric Coating Curing Processes

作　　者：郑振荣[1,2] 韩晨晨[1] 张楠楠[1] 赵晓明[1,2] 

机构地区：[1]天津工业大学纺织学院,天津300387 [2]天津工业大学先进纺织复合材料教育部重点实验室,天津300387

出　　处：《高校化学工程学报》2018年第1期102-108,共7页Journal of Chemical Engineering of Chinese Universities

基　　金：国家自然科学基金(51206122);天津科委自然科学基金(17JCTPJC47800)

摘　　要：建立聚合物涂层液固化过程中溶剂扩散的数值模型,揭示固化成膜过程中溶剂的扩散过程,可为涂膜固化条件设置、涂膜缺陷的预防及新型干燥设备的优化设计提供理论指导。根据菲克第二定律及Vrentas-Duda自由体积理论建立了涂覆于玻璃基体上聚甲基丙烯酸甲酯(PMMA)/丙酮涂层液固化过程的传质传热模型,并运用伽辽金有限元方法对模型方程求解,计算得到涂膜固化期间丙酮和聚甲基丙烯酸甲酯的浓度分布,利用拉曼光谱对模型的有效性进行了实验验证。结果表明:在固化初期阶段(0~700 s),模型预测值与实验值有良好的一致性,两者相对误差范围为0.37%~4.5%;而在固化后期阶段(844 s~),丙酮浓度预测值大都高于实验值,表明模型预测的涂膜固化过程比实际扩散过程要慢一些。Numerical models of solvent diffusion during polymer coating solidification can provide guidance for curing condition optimization, coating defect prevention and design of new drying equipment. Mass and heat transfer models for curing processes of polymethyl methacrylate(PMMA)/acetone coating on glass substrate was established based on Fick's second law and Vrentas-Duda free volume theory. The Galerkin finite element method was used to solve model equations. Concentration distribution of acetone and PMMA was obtained during curing, and the validity of the model was verified by Raman spectroscopy. The results show that the model results are in good agreement with the experimental results in the initial curing stage(0~ 700 s), and the relative error is 0.37%~4.5%. The predicted acetone concentration is higher than the experimental value in the later curing stage(844 s~), which indicates that the modeled coating process is slower than the actual diffusion process.

关 键 词：共焦拉曼光谱 聚合物涂层 自由体积理论 传质传热模型 固化过程 丙酮浓度 

分 类 号：TQ630.1[化学工程—精细化工]