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Polyurethane finish paint selection principle

Author:    Date:2017-6-16 17:32:06

Polyurethane finish Mechanical, mechanical and electrical, machine tools, instrumentation, valves, all kinds of mechanical parts and other metal surface commonly used protective decorative coatings, coating mechanical properties, anti-corrosion effect and decorative Excellent, very suitable for indoor environment brushing, but is not recommended for outdoor or strong ultraviolet areas, because it is not as good as the durability of fluorocarbon anti-corrosion products so long, in order to brush outdoors, it is recommended to use acrylic polyurethane paint. Acrylic polyurethane topcoat before coating on the surface of the substrate can be used to check the following two methods:

(1) chalk test method for non-smooth steel surface, for the area is not sure whether the oil, you can use a chalk straight line through the oil area. In this area, if the chalk line is thinner or lighter, it means that the area may be contaminated with oil.

(2) Alcohol solution test method Applicable to all steel structure surface For suspected contamination of the site, with dipped in isopropyl alcohol defatted cotton ball wipe, and isopropyl alcohol into the transparent glass tube. Add 2-3 times the distilled water, shake mixing about 20min. The same volume of isopropyl alcohol distilled water as a reference, if the solution was cloudy, indicating that the surface of steel pollution. For the choice of matching primer, which depends on the corrosion of environmental levels, anticipation of corrosion years, anti-aging, weather resistance, salt spray level and other factors into account, select the appropriate primer and the middle paint not only enhance the overall anti-corrosion effect, you can also increase the finish Of the overall saturation. Polyurethane paint coating according to the design requirements can have primer - topcoat, primer - intermediate paint - finish matching system, coated metal surface, must be completely removed oil, oxide, rust, old coating, etc. Shot blasting or sandblasting method, roughness of 30-70μm; can also be used manual rust method, roughness of 30-70μm. The use of spraying process pre-coated primer or intermediate paint, recommended film thickness of 60μm, after drying and then finish the paint, the construction of the paint should be smooth and smooth, consistent color, no sagging, blistering, orange peel and other lacquer The According to the corrosive environment and coating requirements are different, supporting the way is different, the following are common polyurethane topcoat package: Epoxy primer / polyurethane primer + polyurethane topcoat epoxy primer + epoxy paint + polyurethane Topcoat Epoxy Zinc Primer+ Epoxy Cake + Polyurethane Topcoat Epoxy Primer + Polyurethane Finish (Stainless Steel, Aluminum, Galvanized Steel Substrate)

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