The present invention provides a process of powder coating aluminium substrate surfaces comprising the steps
a) pre-treating the aluminium substrate surface by a color-less chemical treatment process,
b) applying a clear powder coating composition based on at least one (meth)acrylic resin providing a low gloss of the cured coating in the range of 1 to 20 gloss units at 60 °, and curing the coating composition.
The process according to the invention makes it possible to provide a desired special effect of the coated surface which meets the effect resulted using the anodizing process, called as "anodizing effect". A one-layer coating of the substrate is possible providing additionally a high appearance and smoothness of the cured coating, a strong adhesion to non-primered aluminium substrate surfaces as well as an excellent hardness, corrosion- resistance, weather resistance and light fastness of the cured coating.
本发明提供了一种铝基材表面粉末涂料工艺,包括以下步骤
a) 通过无色
化学处理工艺对铝基材表面进行预处理、
b) 涂上以至少一种(甲基)
丙烯酸树脂为基础的透明粉末涂料组合物,使固化后的涂层在 60 °下具有 1 至 20 个光泽单位的低光泽度,并使涂料组合物固化。
根据本发明的工艺,可以使涂层表面产生所需的特殊效果,这种效果与阳极氧化工艺产生的效果一致,称为 "阳极氧化效果"。基材的单层涂层可以提供固化涂层的高外观和平滑度,与非底漆铝基材表面的强附着力,以及固化涂层的优异硬度、耐腐蚀性、耐候性和耐光性。