Classification and function of lubricating oil additives

Types of lubricating oil additives:

Detergent dispersant, anti oxygen and anti-corrosion agent, extreme pressure and anti-wear agent, oily agent, anti oxygen and anti glue agent, tackifier, antirust agent, pour point depressant, anti foaming agent and demulsifier.

Functions of lubricating oil additives:

(1) Detergent dispersant: adsorb oxidation products and disperse them in oil. Oxidation resistance, corrosion resistance, combination and synthesis of planktonic components.

The main products are: calcium alkylbenzene sulfonate synthesized with low base value, calcium sulfonate synthesized with high base value linear alkylbenzene, calcium sulfonate synthesized with high base value of long-chain linear alkylbenzene, calcium dialkybenzene sulfonate synthesized with high base value, magnesium sulfonate synthesized with high base value of long-chain linear alkylbenzene, calcium alkylphenol sulfide with high base value, polyisobutylene succinimide, boride polyisobutylene succinimide, high molecular weight polyisobutylene succinimide Boride high molecular weight polyisobutylene succinimide.

(2) Anti oxygen and anti-corrosion agent: improve the oxidation stability of oil products - prevent metal oxidation, slow down the oxidation rate of oil products, isolate the contact between acids and metals, and form a protective film with anti-wear property.

The main products are: thiophos butyl octyl primary alkyl zinc salt, thiophos dioctyl primary alkyl zinc salt, basic thiophos dioctyl primary alkyl zinc salt, thiophos propyl secondary primary alkyl zinc salt and thiophos secondary alkyl zinc salt.

(3) Extreme pressure antiwear agent: it can react with metal in the high-temperature part of the friction surface to form substances with low melting point, saving fuel consumption and vibration noise. Extreme pressure agents: most of them are sulfides, chlorides and phosphates, which can react with metals at high temperature to form lubricating substances and provide lubrication under harsh conditions.

The main products are: sulfurized isobutene, thiadiazole derivatives (th561)

(4) Oily agent: it is an active substance with polar molecules, which can form a firm adsorption film on the metal surface and prevent direct contact with the metal friction surface under the condition of boundary lubrication.

(5) Anti oxygen and anti glue agent is used as anti oxygen and anti glue agent for gasoline, lubricating oil, paraffin and other products, and anti-aging agent for rubber and plastics.

(6) Tackifier: also known as thickener, it is mainly polyamata type very high molecular compound. Tackifier can not only increase the viscosity of oil products, but also improve the viscosity temperature performance of oil products.

(7) Antirust agent: it is some polar compounds, which have strong adsorption on metals and can form a tight adsorption film on the interface between metal and oil to isolate the erosion of moisture, moisture and acidic substances; The antirust agent can also prevent oxidation and the formation of acid oxides, so as to play the role of antirust.

(8) Pour point depressant reduces the freezing point of oil products and improves the low-temperature fluidity of oil products

(9) Antifoam agent: make bubbles overflow the oil surface quickly, lose stability and easy to break, so as to shorten the existence time of bubbles.

(10) Demulsifier: it has high degradation performance and water extractability for oil products.