Mannich Base Nitrogen Dispersant
Mannich base dispersants are synthesized by the condensation of alkyl-substituted phenols with formaldehyde and polyamines, producing nitrogen-containing oil-soluble dispersants with excellent deposit control and sludge-dispersing capability. Unlike succinimide dispersants, Mannich bases offer superior high-temperature varnish inhibition and are particularly effective in gasoline engine oil formulations and turbocharged engine oils where oxidative deposit control is critical.
Technical Specifications
| TBN | 15–40 mg KOH/g |
| appearance | Dark amber to dark brown viscous liquid |
| nitrogen content | 1.5–2.5 wt% |
| flash point (COC) | >175 °C |
| alkyl phenol base MW | 600–1500 Da |
| kinematic viscosity (100°C) | 200–1000 mm²/s |
Applications
- Gasoline engine oils requiring high-temperature piston and ring deposit control
- Turbocharged gasoline direct injection (TGDI) engine oil formulations
- Combined with PIBSI for balanced dispersant performance across temperature range
- Fuel system deposit control additives for gasoline and diesel injector cleanliness
- Two-stroke engine oils where high-temperature cleanliness is critical
Key Features
- Superior high-temperature varnish and lacquer inhibition compared to succinimide dispersants
- Excellent thermal stability enables effective performance in modern turbocharged engines
- Complementary to PIBSI: Mannich base controls high-temperature deposits, PIBSI handles low-temperature sludge
- Ashless nitrogen chemistry compatible with all base oil types and low-SAPS formulation requirements
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