| 摘要 |
Oil for high-speed two-stroke engines, characterised in that it consists of: 40.0 to 46.0 parts by mass of the mineral base oil characterised by the viscosity of 11.0 to 15.0 mm2/s at the temperature of 100 degrees C, while the viscosity index is not lower than 90; 5.0 to 9.0 parts by mass of the residual oil characterised by the kinematic viscosity of 28.0 to 35,0 mm2/s at the temperature of 100 degrees Celsius, while the viscosity index is not lower than 85; 25.0 to 35.0 parts by mass of polyisobutylene with the molecular weight of about 450; preferably 6.0 to 8.0 parts by mass of the gasoline-paraffin fraction with the boiling temperature in the range 160 - 245 degrees Celsius. It also contains: 4.5 to 10.0 parts by mass of a dispersing agent such as an imide of butanodioic acid, obtained from polyalphaolefins with the molecular weight between 750 and 2500; anhydride of butanodioic acid and polyethylenediamines, containing at least three atoms of nitrogen in a particle; and/or 1.5 to 4,0 parts by mass of a detergent of the type of a alkalescent calcium sulphonate, obtained by sulphonation of alkylbenzenes and successive neutralization, until the base number reaches the level of 10.0 to 25.0 mg KOH/g; and/or 0.45 to 1.20 parts by mass of oxidation inhibitor such as a polymer of formaldehyde and isobutylphenol and/or alkyldiphenylamine, and up to 0.15 parts by mass of an antifrothing additive. |
