Water-based surface treatment agent for color coating pretreatment of galvanized plates

镀锌板彩涂预处理用水性表面处理剂

Abstract

本发明提供一种镀锌板彩涂预处理用水性表面处理剂,属于彩涂镀锌板的表面处理技术领域。本发明所提供的镀锌板彩涂预处理用水性表面处理剂组分及质量百分比如下:水性树脂,20~60%;有机硅烷,1~5%;无机缓蚀剂,0.5~2.5%,封闭剂,0.5~3%;促进剂,1~3%,去离子水,余量。本发明将无机缓蚀剂、纳米粒子、有机硅烷和水性树脂有机地结合形成复合钝化膜,不仅改善钝化膜与镀锌层的结合力,且提高镀锌板表面处理后的涂装性能。作为封闭剂的纳米二氧化硅经改性后能均匀地分布在钝化膜中,提高膜层的致密性,从而提高其耐腐蚀性能。本发明水性表面处理剂中不含任何价态的铬,是一种环保型表面处理剂,本发明预处理工艺简单,能够满足彩涂工艺的需求。
The invention provides a water-based surface treatment agent for the color coating pretreatment of galvanized plates, and belongs to the technical field of the surface treatment of color-coated galvanized plates. The water-based surface treatment agent comprises the following components in percentage by mass: 20 to 60 percent of water-based resin, 1 to 5 percent of organosilane, 0.5 to 2.5 percent of inorganic corrosion inhibitor, 0.5 to 3 percent of sealant, 1 to 3 percent of accelerating agent and the balance of deionized water. In the water-based surface treatment agent, the inorganic corrosion inhibitor, nano particles, the organosilane and the water-based resin are combined organically to form a composite passivating film, so the bonding force of the passivating film and a galvanizedlayer is improved, and the coating performance of the galvanized plate subjected to the surface treatment is improved. Nano-silicon dioxide serving as the sealant can be distributed in the passivating film uniformly after being modified to improve the compactness of a film layer, so the decay resistance of the film layer is improved. The water-based surface treatment agent does not contain chromium with any valence state, and is environmentally-friendly, the pretreatment process is simple, and the requirement of a color coating process can be met.

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