Alkyd resin is the result of the esterification reaction of a polyol and a polyacid and a monovalent fatty acid. In fact, alkyd resin is a polyester with a monovalent fatty acid in their structure. Alkyd resins dividing into three types of long oil, medium oil and short oil depending on the oil length and are used in various industries including construction paints, decorative paints, corrosion-resistant primers, varnishes and inks, furnace paints, automotive paints, etc.