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The Role of Polyisobutylene in Ashless Dispersants
Classification: Company News
Aug 15,2025
The Role of Polyisobutylene in Ashless Dispersants
As a lipophilic skeleton for dispersants
The PIB chain segments provide excellent oil solubility, making the dispersant molecules highly compatible with lubricating oil. At low temperatures, the softness of the PIB chain helps maintain the fluidity of the dispersant, making it less likely to crystallize or precipitate.
Provide molecular weight adjustability
Low molecular weight PIB (Mn 900-1300) : Good low-temperature performance, suitable for low-temperature engine oil; High molecular weight PIB (Mn 2300-2500) : Strong dispersion power, suitable for heavy-duty diesel engine oil.
Enhance the suspension stability of soot and oil sludge
The hydrophobicity of the PIB chain separates the non-polar oil phase from the impurity particles wrapped by polar groups, preventing them from re-aggregating and depositating.
Reduce ash content
Since PIB itself does not contain metal elements, the dispersant formulated is ashless. After combustion, it will not generate metal ash and will not cause damage to the three-way catalytic converter and DPF.
In ash-free dispersants, polyisobutylene is not only a carrier but also the core material that determines the low-temperature fluidity, dispersion stability and environmental protection performance of the dispersant. By choosing PIB with different molecular weights and reaction structures, the best cleaning and dispersion effects can be achieved for various scenarios such as passenger car engine oil, heavy-duty diesel engine oil, and Marine lubricating oil.
#JD Lubricant Additives #Ashless Dispersant #PIB
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