usually refers to dimer fatty acid, is a complex mixture of ingredients, named because the main component contains two carboxylic acid groups. It uses unsaturated fatty acids, such as oleic acid and linoleic acid, through a cycloaddition reaction Dimer acid has excellent thermal stability and can maintain fluidity in a wide temperature range. It has been widely used in synthetic printed circuit board materials, ink manufacturing, rocket engine materials and other fields. High purity The dimer acid is a light yellow viscous liquid, and the dimer acid with a lower purity is a reddish brown viscous liquid. Currently, vegetable oil feet are usually used as a raw material to obtain a crude product through a high temperature and high pressure reaction under the action of a catalyst, and then the pure product is obtained by molecular distillation. Product.