Lubricant composition for diesel engine

A technology of lubricating oil composition and diesel engine, applied in the direction of lubricating composition, petroleum industry, additives, etc., can solve the problems of shortening service life, reducing catalyst efficiency, poisoning catalyst, etc.

Active Publication Date: 2012-09-26
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Zinc dialkyldithiophosphate (ZDDP) is a phosphorus-containing multi-effect additive with excellent anti-oxidation, anti-wear and anti-corrosion properties. It is an antioxidant component in engine lubricating oil formulations. Due to the phosphorus-containing additive It will enter the catalytic converter through exhaust gas recirculation or blow-by process, and accumulate on the active metal site, poisoning the catalyst, thereby reducing the catalyst efficiency and shortening its service life, so the use of phosphorus-containing additives as lubricating oil components is restricted by specifications and standards
In addition, valve train wear protection, oil scale resistance, protection against filter clogging, lubricating oil loss and low temperature pumpability have become correspondingly more demanding

Method used

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  • Lubricant composition for diesel engine
  • Lubricant composition for diesel engine
  • Lubricant composition for diesel engine

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1-5

[0059] Add antioxidants T534, 1035, and methylidene 4426-S into the mixing container in proportion, heat at 60°C-90°C under normal pressure, and stir for 1 hour-2 hours to obtain a uniform transparent light yellow viscous liquid. Invented component A composite antioxidant. See Table 1 for the composition ratio (mass fraction) of the composite antioxidant preparation examples 1-5.

[0060] Table 1

[0061] serial number

Embodiment 1-6 and comparative example 1、2、3-1、3-2

[0063] Embodiment 1-6 is the composition and main properties of the diesel engine lubricating oil of the present invention. Add each component into the blending container in proportion, heat at 45°C-80°C under normal pressure, and stir for 1 hour-2 hours to prepare a viscosity grade of 15W-40, a phosphorus content mass fraction of no more than 0.09%, and a sulfur content mass fraction of A CJ-4 grade low-phosphorus, low-sulfur, low-ash diesel engine lubricating oil composition with a fraction not exceeding 0.4 percent and a mass fraction of sulfate ash not exceeding 1 percent.

[0064] In comparative examples 1, 2, and 3-1, single-component antioxidants were added, namely T534, 1035, and methylene 4426-S, and in comparative example 3-2, a double-component antioxidant prepared by the method of patent CN100460490C was added. A composite antioxidant, wherein the mass ratio of the two antioxidant components is 7:3.

Embodiment 1

[0065] Example 1 and Comparative Example 1, Example 2 and Comparative Example 2 respectively have all the same formulations except antioxidants, and Example 3 and Comparative Examples 3-1 and 3-2 also have all the same ingredients except antioxidants. formulation composition. See Table 2 for the composition ratios (mass fractions) of Examples 1-6 and Comparative Examples 1, 2, 3-1, and 3-2.

[0066]

[0067] Embodiment 1-6 and comparative example 1,2,3-1,3-2 have carried out pressurized differential scanning calorimetry test (PDSC), ASTM D4742 thin layer oxidation test (TFOUT), the set temperature of PDSC is 215°C. The specific results are shown in Table 3.

[0068] table 3

[0069] oil sample

PDSC / min

TFOUT / min

Example 1

41.2

167

Example 2

39.4

162

Example 3

36.6

154

Example 4

-

157

Example 5

-

152

Example 6

-

159

Comparative example ...

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Abstract

The invention relates to a lubricant composition for a diesel engine. The lubricant composition for a diesel engine contains less than or equal to 0.09% by mass of phosphorus, less than or equal to 0.4% by mass of sulfur and less than or equal to 1.0% by mass of sulfate ash. The lubricant composition for a diesel engine comprises A) a composite antioxidant comprising at least components of 1, an alkylated diphenylamine antioxidant, 2, a thiophenolic ester antioxidant and 3, an unessential phenolic thioether antioxidant, B) a polyisobutylene succinimide ashless dispersant and/or a boronized polyisobutylene succinimide dispersant, C) a mixture of magnesium sulfate and sulfurized calcium alkyl phenate, D) at least one zinc dialkyldithiophosphate, E) one or more ashless friction modifiers, and F) a main amount of lubricating base oil. The lubricant composition for a diesel engine has a synergistic effect of the additives, can satisfy high-temperature antioxidation requirements of lubricating oil for a diesel engine, and has excellent piston cleanliness, wear resistance and a viscosity increasing control capacity.

Description

technical field [0001] The invention relates to a lubricating oil composition, in particular to a lubricating oil composition for a high-grade diesel engine. Background technique [0002] Zinc dialkyldithiophosphate (ZDDP) is a phosphorus-containing multi-effect additive with excellent anti-oxidation, anti-wear and anti-corrosion properties. It is an antioxidant component in engine lubricating oil formulations. Due to the phosphorus-containing additive It will enter the catalytic converter through the exhaust gas recirculation or blow-by process, and accumulate in the active metal site, poisoning the catalyst, thereby reducing the efficiency of the catalyst and shortening its service life. Therefore, the use of phosphorus-containing additives as lubricating oil components is restricted by specifications. The phosphorus content is limited in the high-grade diesel engine lubricating oil standard. For example, CJ-4 grade of heavy-duty diesel engine lubricating oil requires that...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10M161/00C10N30/06C10N30/10C10N40/25
Inventor 谢欣武志强王立华贾秋莲张辉李新华段庆华李华杨永璧
Owner CHINA PETROLEUM & CHEM CORP
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