Calcium naphthenate (CAS 61789-36-4) is a high - quality product available at a low price. It is an organic metal salt formed by the reaction of naphthenic acid with calcium compounds. The chemical formula of calcium naphthenate can be approximately expressed as (CnH2n - 1COO)2Ca, where n represents the number of carbon atoms in the naphthenic acid molecule, usually ranging from 7 to 22.
Typically, it appears as a yellow - brown viscous liquid or semi - solid. It has good solubility in organic solvents such as benzene, toluene, and petroleum ether. The density varies depending on its composition, generally in the range of about 0.9 - 1.1 g/cm³. Its flash point is relatively high, usually above 100°C, which means it has a certain degree of safety during storage and transportation.
1. **Drying agent in paints and coatings**: Calcium naphthenate can be used as a drying agent in alkyd paints, epoxy paints, etc. It promotes the oxidation and cross - linking of the paint film, accelerating the drying process of the paint and improving the hardness and gloss of the paint film.
2. **Antioxidant and corrosion inhibitor in lubricants**: In lubricating oils and greases, it acts as an antioxidant and corrosion inhibitor. It can prevent the oxidation of the lubricant and the corrosion of metal surfaces, thereby extending the service life of the lubricant and protecting mechanical equipment.
3. **Emulsifier and dispersant**: Due to its amphiphilic structure, calcium naphthenate can be used as an emulsifier and dispersant in some emulsion systems. It helps to disperse immiscible substances evenly, such as in the preparation of oil - in - water or water - in - oil emulsions.
1. **In paints and coatings**: When using calcium naphthenate as a drying agent, it is usually added during the paint - making process. The addition amount is generally 0.1% - 1% of the total paint mass, depending on the type of paint and the drying requirements. It should be evenly mixed with other components to ensure its uniform distribution in the paint.
2. **In lubricants**: In lubricating oils, calcium naphthenate is added in a proportion of about 0.5% - 2%. It can be directly added to the lubricating oil and stirred evenly at a certain temperature to ensure good solubility and dispersion.
3. **In emulsion systems**: When using it as an emulsifier or dispersant, the appropriate addition amount needs to be determined according to the specific emulsion system. Generally, it is added gradually during the emulsification process while stirring vigorously to form a stable emulsion.
1. **Paint industry case**: A paint manufacturer used calcium naphthenate in their alkyd paint production. Before using calcium naphthenate, the drying time of the paint was about 4 - 5 hours. After adding 0.5% calcium naphthenate, the drying time was shortened to 2 - 3 hours. The hardness of the paint film increased from 2H to 3H, and the gloss also improved significantly, meeting the high - quality requirements of customers in the high - end furniture market.
2. **Lubricant industry case**: An industrial equipment maintenance company added calcium naphthenate to their lubricating oil for large - scale machinery. After continuous operation for 6 months, the analysis of the lubricating oil showed that the oxidation degree was significantly lower compared to using ordinary lubricating oil without calcium naphthenate. The wear of mechanical parts was also reduced by about 30%, effectively reducing the maintenance cost and downtime of the equipment.
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