共查询到20条相似文献,搜索用时 156 毫秒
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通过DOE进行实验设计和分析,找出影响车身漆膜桔皮的主要因素,并对主要因素进行测量及控制,以达到提高漆膜外观的目的。 相似文献
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电泳涂装产品性能的好坏最终通过电泳漆膜性能体现,因此在电泳涂装结束后需要对涂膜各项性能进行检测以验证漆膜品质。车架电泳涂装结束后,现场需要对电泳涂膜膜厚、附着力、外观、光泽等性能进行检测,电泳漆膜的表面粗糙问题直接影响产品外观。本文通过气相色谱、SEM等检测手段,对车架电泳漆膜表面粗糙问题进行分析,找到电泳漆膜表面粗糙的原因并提出相应的解决措施。 相似文献
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水性罩光清漆固化反应速率对于以“湿碰湿”工艺施工的水性三涂一烘(3C1B)体系有很大影响,水性罩光清漆的固化反应速率主要由作为交联剂的氨基树脂所控制。本文对 3种不同类型的氨基树脂进行了红外表征( FT-IR),分析了其分子结构。分别以上述氨基树脂作为交联剂制备水性罩光清漆,通过旋转流变仪测试清漆在固化过程中剪切储存模量的变化,探究了上述氨基树脂对水性罩光清漆固化反应速率的影响。对比了所制备的水性罩光清漆搭配水性 3C1B中涂和色漆的漆膜性能,分析了氨基树脂对漆膜性能的影响。研究结果表明:以甲醚丁醚混合醚化的氨基树脂作为交联剂的水性罩光清漆的固化速率适用于 3C1B体系,且制备的漆膜性能最佳。 相似文献
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在乘用车的车身涂装中,涂层橘皮是最常见和难以控制的缺陷之一,已成为汽车厂家的棘手问题。阐述了影响涂膜流动和外观的因素;介绍了涂层外观漆膜橘皮的检测方法和车身漆膜橘皮的成因及其防治;以及乘用车塑料外饰件涂装受橘皮的影响因素及其控制;同时指出了车身漆膜橘皮的预防措施。 相似文献
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研究了PMMA膜的成膜方法、成膜特性以及作为气敏材料的应用。实验结果表明,PMMA的表面粗糙度与转速密切相关,转速越大,表面粗糙度越小。PMMA的膜厚符合液体动力学方程,旋涂速度越大,膜厚越薄。当旋涂速度为6000rpm时,可得到厚度为42nm的PMMA膜,完全符合气敏材料对膜厚的要求。 相似文献
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Saeid Savarmand Siroos Azizmohammadi Ali Bahrami Mohammad‐Reza Golkar‐Narenji 《加拿大化工杂志》2004,82(5):905-913
A method for the calculation of the final film thickness in free coating of a viscoelastic fluid onto a vertical surface withdrawn from its vessel is developed. The method is based on the definition of an objective function, the minimization of which guarantees that the kinematic as well as the dynamic conditions at the lower boundary of the dynamic meniscus region are simultaneously satisfied. A systematic approach is provided in order to localize the optimum value of the final film thickness within the optimization interval. It was observed that there was a clear relationship between the estimated final film thickness and the value of a parameter A. The closeness of this parameter to zero corresponds to the dynamic constraint being fulfilled at the lower boundary of the dynamic meniscus region. This relationship is used as an objective means of determining the direction to update the interval of optimization to obtain the final thickness of the film. The results of the proposed method are compared to the previous works on the free coating of viscoelastic fluids, which are based on a trial‐and‐error method. The performance of the previously applied rheological models to the formulation of the free coating process, mainly the modified Oldroyd models, is also compared by introducing the present method. 相似文献
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