COATING SOLUTION FOR PRE-SEALED STEEL SHEET CONTAINING CLAY-POLYMER NANOCOMPOSITE AND METHOD FOR COATING THE SAME ON THE PRE-SEALED STEEL SHEET

摘要

The present invention relates to a method of in spite of the thick resin film thickness 2㎛ over and covering the pre-shielded steel sheet resin composition and this pre-shield plate having improved corrosion resistance, weldability and electro-deposition also tolerance.; According to the present invention, a number average molecular weight of 15,000 - 60,000 is an epoxy resin of 100 parts by weight, the polymer-clay nanocomposite from 5 to 30 parts by weight melamine resin 5 to 20 parts by weight of wax from 1 to 5 parts by weight, and a major axis of 0.5 to the pre-part resin composition shielding steel sheet metal powder 80 ~ 300 parts by weight on one member selected from the group consisting of 4㎛ of Al, Cu, Ni, etc., is provided. Further, according to the present invention, chromate treatment, chrome-free coating processing, or SiOx deposition process comprising the steps of: providing a layer of zinc or zinc alloy plated steel sheet is any one of the processes of the step of coating so that the resin composition is dried film thickness of 1.5 ~ 8㎛ the treated steel sheet as described above, and the resin a method of firing the composition is applied to the steel sheet 200 ~ 250 ℃ and coating a resin composition consisting of the steps of cooling, pre-shielded steel sheet is provided.; Resin coating film according to the present invention exhibit a galvanized or O United excellent corrosion resistance, chemical resistance, weldability, electrodeposition also Wall and workability when coating the plated steel sheet.