Dimer acid, usually referred to as dimer fatty acid, is a complex mixture, a colorless transparent liquid. Its relative density is 0.95, and its flash point is between 280-350℃. Dimer acid is soluble in almost all solvents such as acetone, ethanol, ether, aliphatic, naphtha, etc., but insoluble in water. Dimer acid is an important oil and fat chemical, which is widely used in industries such as coatings, surfactants, lubricants, printing inks, and hot melt adhesives. 12
High-purity dimer acid is obtained by using advanced separation technology to remove impurities such as monoacids, trimers, and polymeric acids in conventional dimer acid, so that the content of dimers in dimer acid reaches more than 90%. High-purity dimer acid has the characteristics of light color, high purity, and uniform molecular weight distribution. It can be used to synthesize polyamide resins as high-quality raw materials for high-grade inks, coatings, and hot melt adhesives.
The raw materials of dimer acid are mainly 18-carbon unsaturated fatty acids, such as oleic acid and linoleic acid, which are formed by the mutual polymerization of molecules. The production methods include thermal polymerization and clay catalysis. The polymerization product is industrial dimer acid, which contains 3% monoacid, 75% dimer acid and 22% trimer acid. The product obtained by molecular distillation or thin film evaporation is high-quality dimer acid, which contains 0.2% to 1.5% monoacid, 93.5% to 97% dimer acid and 3% to 5% trimer acid.