Coating for sandwich panel and board two-used colorful steel plates and method of use thereof

Abstract

The invention discloses a coating material used in a sandwich board-veneer double use color-coated steel plate and a method for using the same. The compositions in percentage by mass of the coating material are: 48 to 53 percent of epoxy modified polyester resin, 22.9 to 25.6 percent of pigment powder, 5 to 8 percent of polyurethane crosslinking agent, 3 to 4.5 percent of methanol-etherized amino resin, 2 to 4 percent of butanol-etherized amino resin, 3 to 5 percent of p-toluenesulfonic acid, 4 to 8 percent of butyl glycol ether, 3 to 4 percent of butyl acetate and 2 to 4 percent of cyclohexanone. The coating material adopts a modified epoxy system and a back coating adopts double layer coating mode in order to meet the requirements of product durability; meanwhile, the comprehensive adjustment of viscosity, speed and pressure during primary / fine coat back coating process is carried out to ensure the coating effect of a product; therefore, the surface rigidity (i.e. the scratch resistant performance) of the product can reach to 1,200 g; meanwhile, the crosslinking density after coating material curing is higher and the corrosion resistant performance of the product is stronger (reaching to the zero grade after 500-hour salt spray test).

Description

technical field [0001] The invention relates to the manufacture of cold-rolled color-coated steel sheets, in particular to coatings for sandwich panels and single-board dual-purpose color-coated steel sheets and their application methods. Background technique [0002] According to the statistics of the European Coil Coating Association (ECCA) and the American Coil Coating Association (NCCA), the annual output of global steel substrates has reached more than 17 million tons in 2005, and the application of steel substrate color coating products has been extended to construction, automobile (transportation) ), home appliances, furniture, packaging and other fields, but architectural use is still the main use of color-coated products, accounting for 65.3% of the global total output. [0003] Walls and roofs are the most important parts of prepainted products for construction purposes. These two products are mainly divided into veneer and sandwich panels according to the environm...

AI Technical Summary

Problems solved by technology

[0009] The back paint of color-coated products produced by other manufacturers in the domestic market is all single-layer epoxy back paint (two coats and one bake), and the coating thickness is about 5 microns. Chromium pigments, therefore weaker in long-term performance

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