TH41558B - Steel sheets have weather-resistant paint and a durable manufacturing process. - Google Patents

Abstract

DC60 (17/01/57) This disclosure refers to weather-resistant colored steel sheets, consisting of a steel sheet as a base, a galvanized or zinc alloy layer on the steel sheet, a chromate or non-chromate coating layer on the galvanized or zinc alloy layer, and a weather-resistant film on the chromate or non-chromate coating layer. The weather-resistant film consists of a primary polyester coating on the chromate or non-chromate coating layer, and a top polyester coating on the primary polyester coating. The top polyester coating is made from a mixture of a primary resin derived from a reaction of oil-free polyester-modified resins and polyisocyanate melamine resin compounds as binders and other fillers. The physical properties of weather-resistant galvanized or zinc alloy colored steel sheets (WDP) are excellent in terms of application characteristics such as weather resistance and ultraviolet light resistance compared to regular colored steel sheets. Generally Modified (RMP), Highly Weather Resistant (HDP), and Silicone Modified (SMP) colored steel sheets are available. Additionally, Weather Resistant Color Steel Sheets (WDP) are cheaper than fluorine resin-reinforced steel sheets, exhibit significantly less color fading, and possess comparable physical properties. This disclosure describes a weather-resistant colored steel sheet consisting of a steel sheet as a backing, a galvanized or zinc alloy layer on top of the steel sheet, a chromate or non-chromate coating layer on top of the galvanized or zinc alloy layer, and a weather-resistant film on top of the chromate or non-chromate coating layer. The weather-resistant film comprises a polyester primary coating layered on top of a chromate or non-chromate coating layer, and a top polyester coating layer on top of the polyester primary coating. The top polyester coating is a mixture of a polymer-modified oil-free polyester primary resin and polyisocyanate compounds, with melamine resin as a binder and other fillers. The physical properties of weather-resistant galvanized steel (WDP) or zinc alloy coated color steel sheets are superior in terms of application characteristics, such as weather resistance and ultraviolet light resistance, compared to conventionally modified weather-resistant (HDP) and silicon-modified (SMP) colored steel sheets. Furthermore, weather-resistant (WDP) colored steel sheets are cheaper than fluorine resin coated steel sheets, exhibit significantly less discoloration, and possess comparable physical properties to fluorine resin coated steel sheets.

Claims (6)

1.Color steel plate with good weather resistance, consisting of 1 steel plate as support. Zinc layer or zinc alloy 2 is coated on steel plate 1 layer 3 is coated on galvanized layer or zinc alloy 2 and is chromate or Non chromate and 10 weather resistant film are on the coating layer. Chromate or non-chromate 3 in a weatherproof film 10 including a primary coating 4 made of polyester. Coat on the chromate layer Or not chromate 3 and top coat Polyester 5 top coat 4 layer polyester primary coat 5 top coat 5 made from a mix of resins The core is obtained from the reaction of oil-free resins modified from polyester and It consists of polyisocyanate, melamine resin as the connecting agent. And other fillers 2. Color steel plate with good weather resistance according to claim 1, in which oil-free resin The polymer resin has an average molecular weight of 1000 - 9000, a glass transition temperature (Tg) -5-45 degrees Celsius, and an OH group number 15-150. 3.Colored steel plate with good weather resistance according to claim 1, containing compound Isocyanates are 5-30 parts by weight by solid resin. 4.Colored steel plate with good weather resistance according to claim 1, containing 4-10 parts melamine resin by weight by weight of the top coat 5. 5. Weather resistant colored steel sheet according to claims 1 to 4, where the coating layer 3 has a density of 20-80 mg / m3 and the primary coating layer 4 has a dry film thickness 4. - 7 micrometers and top layer 5 pilasters with dry film thickness 15 - 22 micrometers. 6. Method for producing weather-resistant colored steel consists of a chromate or non-chromate coating process on a galvanized layer or zinc alloy 2 at a linear speed of 60 - 120 m / min and bake. Dry the chromate or non-chromate layer at 60-140 ° C to form a coating layer 3, create a pre-coating layer 4, rotate coating, top coat 5 with the reactive primary resin. Of wrought oil-free resins Converted from polyesters and polyisocyanate compounds, melamine resin to the coupling agent. And other fillers on the primary coating 4 made of polyester and heated and baked, the coated structure rotates at a maximum metal temperature of 190 - 240 ° C for Create a film that is resistant to good weather conditions 10