HA161 High Molecular Polyisobutene Bis-Succinimide

Polyisobutene Succinimide

CAS: 84605-20-9
Molecular formula: R-C₄H₃O₂N(C₂H₄NH)_m C₂H₄ C₄H₃O₂-R

Polyisobutene Succinimide (PIB-SI) is synthesized from high-molecular-weight polyisobutene. Its long-chain structure provides strong steric hindrance, effectively dispersing high-temperature soot particles—for example, 200 nm soot particles in diesel engine oil remain stably suspended—thereby preventing sludge formation. In IIIG engine tests, high-temperature coke deposits were reduced by more than 30% compared with conventional dispersants.

The high-molecular-weight PIB segments enhance oil solubility and adhesion, forming a stable lubricating film on metal surfaces to reduce friction and wear. Its polymeric structure also minimizes high-temperature volatility, extending oil service life, particularly under high-shear conditions. When used in combination with detergents such as high-alkalinity sulfonates or sulfured alkylphenol calcium, it further improves the overall cleaning-dispersing balance of the formulation.

APPLICATIONS

Heavy-duty diesel engine oils: such as API CK-4/FA-4 and Euro VI specification products, suitable for high soot conditions (>6%).
They address low-temperature sludge and high-temperature deposit issues caused by frequent start-stop cycles in hybrid and plug-in hybrid engines.
Used in gas turbine lubricants to provide reliable lubrication in high-temperature gas environments while inhibiting varnish formation.
Meets the lubrication requirements of wind turbine gear oils under high loads and long service intervals.
Range-extended electric vehicle engine oils: designed to maintain oil stability while balancing electric drive operation with internal combustion engine performance.

RECOMMENDED DOSAGE

The recommended dosage is from 0.1% to 10.0%.

 CHARACTERISTICS

PACKING

Drum/ IBC