Polyurethane finish paint

Abstract

The invention relates to a polyurethane finish paint. The invention is characterized in that the polyurethane finish paint is prepared by mixing aids, resins, a filler, matting powder, a solvent and a curing agent. The acrylic resin and polyurethane resin used as film formers are compounded with the polyurethane resin and hydroxyacrylate resin to obtain the coating with excellent drying property and mechanical properties. The paint has favorable ply adhesion, and thus, is beneficial to coating repair. The paint has high solid content, can effectively lower VOCs (volatile organic compounds), and satisfies the serious requirements for the environment. By selecting hexamethylene diisocyanate biuret as the curing agent, the finish paint has better impact resistance and water resistance. The dispersing agent, leveling agent, defoaming agent and other aids are proportionally added in the formula to perform favorable surface effects, but can obviously lower the surface tension of the coating, influence the recoating of the paint film and lower the overcoatability.

Description

technical field [0001] The invention relates to the field of paint decoration, in particular to a polyurethane topcoat. Background technique [0002] Due to its good decorative properties, chemical resistance, good weather resistance and corrosion resistance, polyurethane topcoats have been successfully used in furniture, vehicles, ships, aircraft and other fields, and have become a hot spot in the field of paint decoration. Generally, artificial air spraying is used for polyurethane topcoat construction. Due to the complexity of on-site construction conditions, such as: too much dust in the air, poor ventilation, and unprotected handling by workers, it will inevitably cause dust on the paint surface or bump damage, etc. This requires re-patching. For general repairs, in order not to affect the appearance of the surface, the surface needs to be completely polished to increase the surface roughness and improve the adhesion between layers. However, for complex structural part...

AI Technical Summary

Problems solved by technology

Generally, artificial air spraying is used for polyurethane topcoat construction. Due to the complexity of on-site construction conditions, such as too much dust in the air, poor ventilation, and unprotected handling by workers, it will inevitably cause dust or bump damage on the paint surface. This requires re-patch

For general repairs, in order not to affect the appearance of the surface, the surface needs to be completely polished to increase the surface roughness and improve the adhesion between layers. However, for complex structural parts, it is sometimes difficult to completely polish the surface. There will be a problem of poor adhesion at the unpolished part, which will make repairing difficult and affect the construction progress