Alkyd resin is a resin synthesized from alkyd and polyacid. Due to the side effects such as internal esterification and etherification that occur during the esterification reaction between multivalent alcohols and polyacids, a resin formation reaction with extremely complex structure occurs. The specific gravity of alkyd resin is 2.16-2.24, with a heat resistance temperature of 210. It is opaque and has excellent chemical corrosion resistance. Its main use is as a seasoning and adhesive for coatings.