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薄型钢结构涂料处理方法研究


  在薄型钢结构水性防火涂料、耐高温涂料配方设计研究中,防火涂料、耐高温涂料的施工工艺研究也很重要,施工工艺条件对涂料的使用性能和装饰性有重要影响。钢结构防火涂料应由经过培训合格取得资质的专业施工队进行施工,施工中的安全技术和劳动保护等要求,应按国家现行有关规定执行;施工现场质量管理应有相应的施工技术标准、质量管理体系、质量控制及检验制度、施工方案等技术文件。防火涂料、耐高温涂料的施工是使涂料在被保护物件表面形成所需涂膜的过程,防火涂料、耐高温涂料对被保护基材表面的装饰、保护以及功能性作用是以其在物件表面所形成的涂膜来体现。薄型钢结构水性防火涂料、耐高温涂料的施工工艺研究包括3方面内容:被保护基材钢结构表面处理方法研究、施工环境对涂装效果影响的研究和施工工艺研究。

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  施工环境对防火涂料、耐高温涂料涂装效果有相当大的影响。一般要求施工场所环境明亮、不受日光直晒、温度和湿度合适、空气清洁、风速适宜、防火条件好。施工场所除应具备一定亮度或照明条件外,还要求避免日光直晒,在烈日下施工很易造成涂膜缺陷。大气的温湿度与涂料施工和干燥性能关系很大。实验表明:在高温、高湿情况下,防火涂料、耐高温涂料中的一些组分会慢慢发生化学反应而造成涂膜变脆而开裂脱落。一般温度在5℃以下或高于50℃,相对湿度在85%以上时,施工效果都不太理想。适宜的施工气候条件为:在施工过程和施工之后,涂膜干燥固化之前,环境温度宜在5~50℃,相对湿度不大于90%,空气应流通。若温度过低或过高,风速在5m/s(4级)以上时,都不利于防火涂料、耐高温涂料施工。不能在户外露天施工,钢构件表面或防火涂料、耐高温涂料表面有结露时不能施工;施工好的涂膜未完全固化前不能受到雨淋、雾水的影响和表面结露;每次涂刷厚度不能太厚,上道涂膜未干就进行下一次施工等都可造成涂层空鼓、开裂。空气中的尘埃对涂装效果影响特别大,必须采取防尘措施,不同涂层要求不同的防尘标准。通风效果既影响涂层质量,又影响施工场所的安全卫生。

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