Dimer acid is a colorless transparent liquid. The relative density of 0.95, a flash point of 280-350 . Soluble in acetone, ethanol, ethyl ether and aliphatic solvent naphtha, almost all. Pure dimeric acid is a dibasic acid c36, it is difficult to easily give it the correct molecular structure. 

Dimer acid production methods: drying oil, semi-drying oil and other vegetable oils, such as soybean oil, cottonseed oil, rice bran oil containing high linoleic acid, oleic acid natural oils, fatty acid obtained by purification, and then by intermittently pressure catalytic polymerization or continuous catalytic polymerization or intermittent discharge atmospheric oxygen methanol vapor polymerization processes in the system. 

Dimer acids purposes: dimer fatty acid having similar reactive general, products can be generated with an alkali metal salt, can be derivatized to acid chloride, amide, ester, diamine, diisocyanate and the like. Dimer acids with long-chain alkyl and cyclic structures, and various solvents have a good miscibility, thermal stability, in the winter is not cured, but there are still anti-corrosive effect of vapor pressure, good lubrication. It is widely used as a fuel oil, lubricating oil, rolling oil, hydraulic oil, cutting oil additive. 

Widely used in the market a high-purity dimer acid has light color, high purity, uniform molecular weight distribution and other characteristics, for the synthesis of polyamide resins can be used as high-grade printing ink, paint, hot melt adhesive quality raw materials. By synthetic ink has high gloss, good adhesion, excellent diluted alcohol, gelling low, quick-drying and low odor, etc; synthetic epoxy curing agent has good flexibility, adhesion and interference song, toughness, chemical resistance, temperature resistance and surface gloss; synthetic polymers have excellent flexibility, sealing, water resistance and adhesion strength. Meanwhile, the high-purity dimer acid used in oil exploration surfactants, corrosion inhibitors, lubricants, anti-rust oil field has excellent performance and is an important fine chemical industry, chemical intermediates. 

High purity dimer acid can be used to synthesize ink polyamide resin, polyamide resin, epoxy curing agents, synthetic polyamide hot melt adhesive, and used metalworking oils, semi-synthetic or fully synthetic cutting fluid. 

In summary extensive use dimer acid, mainly for the production of polyamide resins, lubricants, anti-rust oil, adhesives, coatings, surface active agents, food additives, corrosion inhibitors, specialty lubricants, adhesives, plastics printing inks. For gasoline and diesel fuel additive for synthetic lubricants, widely used in coatings such as alkyd, polyurethane coatings.