Preparation of Waterborne High-hardness Anti-pressure and Anti-stain Clear Topcoat
Using waterborne resin,matting powder and other additives as raw materials,through formula optimization and improvement,a waterborne clear topcoat with high hardness,pressure resistance and stain resistance was prepared.The compound screening and proportion of different waterborne acrylic resins and waterborne polyurethane resins,as well as the effects of different film-forming additives and matting powder types on the hardness,pressure resistance,stain resistance and transparency of the finally developed waterborne fully matte(gloss of 2%～5%)high-hardness anti-pressure and anti-stain clear topcoat were discussed.The test was carried out in accordance with the standard GB/T 6739-2006 Determination of Paint Film Hardness by Pencil Method for Paints and Varnishes to evaluate the hardness of the coatings film.The results show that when the formula uses waterborne resins 7515 and 2593[compound ratio m(7515)∶m(2593)=3∶1],film-forming additive DE,matting powder P260DS,and 1%enhancer(azopyridine),the finally developed waterborne high-hardness anti-pressure and anti-stain clear topcoat has the best pressure resistance,hardness performance and stain resistance,and the pencil hardness grade reaches F.
万方数据
维普
