Appearance: Usually a yellow - to - dark - brown viscous liquid or semi - solid. The higher - purity dimer acid is a light - yellow viscous liquid, and the lower - purity one is a red - brown viscous liquid.
Density: About 0.95g/cm³
Flash Point: 280 - 350℃
Solubility: Soluble in almost all solvents such as acetone, ethanol, ether, aliphatics, and naphtha, but insoluble in water.
Preparation Method
It is usually prepared by using vegetable oil foot as raw material, reacting under high - temperature and high - pressure conditions with a catalyst to obtain the crude product, and then further purifying it by molecular distillation to obtain the high - purity product.
Quality Indicators
Taking ATUREX - 1017 dimer acid as an example, the saponification value is 195 - 202mgKOH/g, the color (Gardner) is ≤8, the acid value is 190 - 197mgKOH/g, the viscosity (25°C) is 7800 - 8500mPa·s, the monomer (HPLC) is ≤6%, the dimer (HPLC) is 70 - 82%, and the trimer (HPLC) is 15 - 22%.
Uses
Coating Industry: It is an important raw material for preparing high - performance coatings. The coatings containing dimer acid have excellent weather resistance, corrosion resistance, and good adhesion, and perform well in outdoor use.
Lubricant Additive: Dimer acid and its derivatives can be used as additives for lubricants to improve the extreme - pressure property, anti - wear property, and oxidation resistance of lubricants.
Surfactant: The molecular structure of dimer acid contains both a hydrophobic long - chain and a hydrophilic carboxylic acid group, so it can be used to produce various surfactants, which are widely used in the daily chemical, textile and other fields.
Adhesive: The dimeric acid amide synthesized from dimer acid has been widely used in the adhesive, coating and other industries, improving the adhesion, weather resistance and corrosion resistance of these products.
Other Fields: It can also be used in the synthesis of printed circuit board materials, rocket engine materials, and as an auxiliary for ore flotation, rust - preventive, etc.
Packaging and Storage
It is generally packaged in 190 - kg iron drums or 950 - kg IBC ton drums. The shelf life is 12 months when stored at 2 - 25°C in the original unopened packaging.