自动门
成都自动门:粉末涂料的分类
发布时间:2012/12/7
粉末涂料的分类。
粉末涂料是一种含100%固体成分的,以粉末形态进行涂装的涂料,它与一般溶剂弄涂料和水性涂料不同,无需使用溶剂或水作为分
散介质,而是借助于空气作为分散介质。涂料可分为热固性和热塑性两大类。目前,在铝合金材料上涂覆用度的粉末涂料大部分都是热固
性粉末涂料,它具有较好的流平性,能牢固地黏附于经过预处理的铝合金材料表面,固化后具有较好的装饰性和防腐性。
热固性粉末涂料由热固性树脂、固化剂(或交联树脂)、颜色、填料和助剂等组成,把上述成分经预混合、熔融挤出混合、冷却、破
碎、细粉碎和分组过筛等步骤,制成粉末涂料。树脂本身分子量较小,不能成膜,只有在烘烤条件下,与固化剂(或交联树脂)起化学反应
交联成体型结构后才能形成涂膜。热固性粉末涂料的品种繁多,可用多种方法进行分类。比较常用的分类方法是按涂料中所采用的树脂各类
进行分类。用这种分类方法可分为环氧类粉末涂料,聚酯类粉末涂料,丙烯酸类粉末涂料、氟树脂粉末涂料等。
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