The film-forming material of anti-corrosion coating has chemical stability in corrosive medium, and its standard is related to the composition and chemical structure of film-forming material. It mainly depends on whether it is easy to react with corrosive medium or decompose into small molecules in the medium under dry film conditions.
At present, there are three kinds of synthetic resin paints with excellent properties - polyurethane varnish, polyester varnish and acrylic varnish. Polyurethane varnish is a new type of interior coating with excellent performance. Due to the thick film and high solid content, the paint film looks like glass after drying. Some people call it "glass paint", also known as "resin paint".
As a composite material, unsaturated polyester resin has been well used in the fields of coatings, FRP, artificial stone, handicrafts and so on. However, the yellowing of unsaturated resin has always been a problem perplexing manufacturers. Generally, the yellowing causes of unsaturated resin include the following: