High temp resistant electrostatic powdered paint and prodn. technique

Abstract

This invention discloses a method for manufacturing a high temperature-resisting electrostatic powder coating, which is composed of organic silicon polyester resin 20-40 wt.%, epoxy resin 20-40 wt.%, specialty curing agent 1-5 wt.%, leveling agent 0.7-1.5 wt.%, titanium dioxide powders 0-25 wt.%, barium sulfate 0-25 wt.%, high temperature-resisting pigments (carbon black, chrome yellow, etc.) 0.1-2 wt.% and benzoin 0.2-0.8 wt.%. The powder coating is manufactured by: mixing the raw materials in a mixer, smelting in an extruder at 100-130 deg.C for 20-70 s, extruding, cooling the extruded sheets, pulverizing and grinding in a pulverizer to obtain high temperature-resisting electrostatic powder coating of 100-350 mesh. After curing of the coating, the coated surface can stand baking at 230-300 deg.C while still retains the previous appearance and physical and chemical properties. The coating can elongate the service life of the coated materials.

Description

technical field

[0001] The invention relates to the field of powder coatings, in particular to a special electrostatic powder coating and its production process. Background technique

[0002] Powder coating is a kind of solid coating used for anti-corrosion and anti-rust on the surface of materials, which can protect the surface of materials and play a decorative role. It is a solid powder coating that does not contain organic solvents or water. It is sprayed on the surface of the object to be coated in powder form, melted and leveled after baking, and forms a film after curing and adheres to the surface of the object to be coated. The use of powder coatings has the advantages of less environmental pollution, high production efficiency, safe use, and easy to master coating technology. Therefore, it has been widely used in recent years. However, after the commonly used powder coating is cured at a temperature above 220°C, discoloration, peelin...