Calcium petroleum sulfonate is a type of oil-soluble organic calcium salt derived from the sulfonation of petroleum fractions, followed by neutralization and modification with calcium-containing compounds. It usually appears as a brown to dark brown viscous liquid or amorphous powder, with excellent compatibility with mineral oils, synthetic lubricants, and various petroleum-based additives.

Insoluble in water but highly dispersible in oil-based systems, it exhibits outstanding thermal stability, anti-corrosion performance, and acid-neutralizing capacity under high-temperature and high-humidity conditions. As a classic multifunctional lubricant additive, it has been widely used in the petroleum refining and machinery industries for decades. Its application covers engine oils, industrial gear oils, metalworking fluids, and rust-preventive greases, valued for its balanced anti-rust, detergent-dispersant, and extreme pressure properties.

Core Functions of Calcium Petroleum Sulfonate

High-performance anti-rust and anti-corrosion agentThis is the most essential application of calcium petroleum sulfonate. When added to lubricating oils or greases, it can adsorb firmly on the surface of metal components to form a dense, oil-soluble protective film. This film effectively isolates metals from corrosive media such as moisture, oxygen, and acidic by-products generated during fuel combustion, preventing rusting of steel parts and corrosion of non-ferrous metals like copper and aluminum. It is particularly suitable for protecting internal combustion engines, gearboxes, hydraulic systems, and metal workpieces during storage and operation.

Detergent and dispersant for engine oilsAs a key detergent-dispersant component in engine oils, calcium petroleum sulfonate can disperse harmful substances such as oil sludge, carbon deposits, and metal wear particles generated during engine operation into the lubricating oil system. It prevents these impurities from depositing on critical components such as piston rings, cylinder walls, and oil passages, maintaining the cleanliness of the lubrication system, improving oil circulation efficiency, and extending the service life of both the lubricant and the engine.

Acid neutralizer and anti-oxidation auxiliaryIn lubricating oils, especially engine oils, calcium petroleum sulfonate can neutralize acidic substances produced by the oxidation of oil products and incomplete fuel combustion. This function effectively reduces the corrosive damage of acidic media to metal parts, delays the oxidative deterioration of lubricating oils, and enhances the overall oxidation stability of the oil. It also helps extend the oil change interval of equipment under harsh working conditions.

Additive for metalworking fluids and greasesIn metal cutting, stamping, and drawing fluids, calcium petroleum sulfonate provides temporary anti-rust protection for workpieces and tools after processing, while also improving the lubricating performance of the fluid to reduce friction between tools and workpieces. In greases, it acts as a thickening modifier and anti-corrosion auxiliary, enhancing the adhesion, water resistance, and extreme pressure performance of greases, making them suitable for use in heavy-duty machinery and outdoor equipment.