涂料物化性能测试技术PPT.ppt

1/27/2018 Prepareed by: Liu Chenzhong 2 漆膜缺陷原因分类: 涂料问题(Product problems) 应用不良(Application problems) 设备因素(Equipment problems) 环境因素(Environment Cause) 颜色问题(Colour problems) 1/27/2018 Prepareed by: Liu Chenzhong 3 漆膜硬度不够（weak): 描述(DESCRIPTION) 表现为漆膜软, 很容易被划伤； 相应的耐溶剂性能表现差。 1/27/2018 Prepareed by: Liu Chenzhong 4 原因（cause)： 通常是漆膜树酯交链不够好， 而交链不够的主要因素有： １树酯分子选择不合适； ２未完全干燥； ３高温漆或双组份漆烘烤温度不够； ４双组份漆固化剂配比不对。 1/27/2018 Prepareed by: Liu Chenzhong 5 起泡（blowing)： 1/27/2018 Prepareed by: Liu Chenzhong 8 溶剂泡（Solvent Popping ） 描述（DESCRIPTION） 新喷漆膜表面有直径小于1MM的小气泡。Open topped blisters up to 1mm in diameter on the surface of the most recently applied paint film. 1/27/2018 Prepareed by: Liu Chenzhong 9 溶剂泡（Solvent Popping ） 起因（CAUSE） Air or solvent vapour trapped by fast drying paint forming a skin. This may be due to: a) 天那水太差或太快干。poor quality or too fast thinner. b) 喷得太厚或两层漆之间干燥时间不够。excessive film thickness, or insufficient drying time between coats. c) 压缩空气压力太低。compressed air pressure too low. d) 加热太快。drying temperature too high, heat source too close to the film, too hot, or applied too soon. 1/27/2018 Prepareed by: Liu Chenzhong 10 溶剂泡（Solvent Popping ） 预防（PREVENTION） a) 确保工件表面清洁Ensure that the surface is scrupulously clean. b) 使用合适的天那水。Use only recommended thinner. c) 每层漆膜厚度合适，并适当闪干Apply paint in thin, wet films. Allow sufficient drying time between coats. d) 使用正确的喷漆压力Use correct compressed air pressure. e) 烘烤前适当流平，避免加热过快，热源过近。Allow sufficient flash off time before force drying, ensure that the correct drying temperature is not exceeded. Do not allow the heat source to be placed too close to the surface. 1/27/2018 Prepareed by: Liu Chenzhong 11 针孔（Pinholing） 描述（DESCRIPTION） 小凹穴，通常直径小于1MM。 Small cavities, generally less than 1 mm in diameter, 1/27/2018 Prepareed by: Liu Chenzhong 12 针孔（Pinholing） 预防（PREVENTION ） a)一次不要喷得太厚。Do not spray too thick one time, b)烘烤之前适当流平。Flashing the film before baking. c) 使用涂料厂商推荐的附料。Use only recommended materials. d) 正确调配油漆，使用较慢干稀释剂。Mi