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三防漆涂覆过程中粘度厚度的变化

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  粘度变化:三防漆在使用前后都会有不同粘度变化,三防漆流速会随着温度改变而变化,温度越高时流速越快,可以针对性的进行测试对比,以确定更理想的涂覆温度。


  涂层厚度:如果希望得到较厚的涂层,**通过涂两层较薄的涂层来获得,且要求必须在第一层完全固化后才允许涂上第二层,有一些三防漆则是表干后即可进行二次涂覆。


  膜层的厚度:膜层的厚度取决于应用方法,稀释剂的加入量大,胶的粘度低,涂胶的厚度薄;反之,胶的粘度高,涂胶的厚度厚。


  不易涂覆的区域:有些PCB线路板元器件不易涂三防漆,有些是不能涂三防漆,如连接器、插座、开关、散热器、散热区域、插板区域等是不允许有涂覆材料的,涂覆后可能会造成接触不良,有些三防漆会影响元器件参数,可以用易撕型胶纸遮盖。


  温度与湿度:涂覆作业应控制在一定的温度范围,通常不低于16℃及相对湿度不低于75%的条件下进行。


  涂层的修复方法:如果修复已经涂覆的器件,只需将焊接电烙铁直接接触涂层就可去掉该元器件,装上新的元器件后,再将该区域用刷子或溶剂(稀释剂)清洗干净,然后干燥,重新再用三防漆涂料涂覆则可,有一些三防漆则需要用指定的溶剂清洗方可取掉,要参考MSDS。


  有些三防漆含有可燃溶剂,应避开高温与明火,应具备足够的通风条件,避免长时间吸入挥发性气体和长时间反复与皮肤接触受损,要按照应急预案做好准备工作。


  三防漆操作员安全:涂覆前要充分了解产品特性,操作要令,注意事项,操作过程中注意安全和防护,环境应通风,操作员工应佩戴防护面具。


三防漆涂覆过程中粘度厚度的变化



安达自动化旗下的iCoat-6系列涂覆机,适用于基板正反面选择性涂覆;元器件、引脚的选择性涂覆。欢迎各大商客来电咨询,热线电话:400-660-7690转1。


(内容来源于网络,小编整理报道。)


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