Lubricant composition for methanol engine

A lubricating oil composition, methanol engine technology, applied in the direction of lubricating composition, petroleum industry, additives, etc., can solve the problems that have not mentioned the application of thiophenol ester type antioxidant and thioether phenol type antioxidant, etc., Achieve excellent anti-oxidation performance, good high-temperature cleaning effect

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

The patent does not mention the application of thiophenol ester antioxidants and thioether phenol antioxidants

Method used

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  • Lubricant composition for methanol engine
  • Lubricant composition for methanol engine
  • Lubricant composition for methanol engine

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1-4

[0058] 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. The composition ratio (mass fraction) of composite antioxidant preparation examples 1-4 is shown in Table 1.

[0059] Table 1

[0060] serial number

Embodiment 1

[0062] Examples 1-5 are the composition and main properties of the lubricating oil composition of the present invention. The components are added in proportion to the mixing container, heated at 45° C. to 80° C. under normal pressure, and stirred for 1 hour to 2 hours to prepare a lubricating oil composition with a viscosity grade of 5W-40. 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. Divide compound antioxidant, wherein embodiment 1 and comparative example 1, embodiment 2 and comparative example 2 have all identical formulas except antioxidant respectively, and embodiment 3 and comparative example 3-1, 3-2 also have All the same formula composition except antioxidant. See Table 2 for the composition ratios (mass fractions) of Examples 1-5 and Comparative Examples 1, 2, 3-1, and 3-2...

Embodiment 6-9

[0072] The speckle dispersion test was carried out for Examples 6-9, and the formulation composition and dispersion test results are shown in Table 5. Wherein embodiment 6, what added in embodiment 7 is the mixture of polyisobutylene succinimide and polyisobutylene succinate pentaerythritol ester, what add in embodiment 8, 9 is the dispersant of single component.

[0073] table 5

[0074]

[0075] The spot dispersion test method is to add 1g of program VG engine oil sludge to 2g of test oil, ultrasonically disperse it for 6 minutes, heat it in an oven at 200°C for 2 hours, then drop the oil on the filter paper, and measure the difference between the diameter of the oil spot dispersion circle and the diameter of the sludge after 24 hours. The ratio is the dispersion index. The higher the dispersion index, the better the dispersibility of the oil.

[0076] From the results in Table 5, it can be seen that the mixture of dispersants has better dispersion performance than the ...

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PUM

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Abstract

The invention relates to a lubricant composition for a methanol engine. The lubricant composition comprises A) a composite antioxidant comprising at least ingredients 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 polyisobutylene succinate dispersant, C) a mixture of magnesium sulfonate and sodium sulfonate, D) at least one zinc dialkyl dithiophosphate, E) one or more oil-soluble organic molybdenum friction modifiers, and F) a main amount of lubricating base oil. The lubricant composition for a methanol engine utilizes optimized combination of the multiple ashless antioxidants, is compounded with the appropriate clearing agent and the dispersant, has a synergistic effect of the additives, can satisfy high-temperature antioxidation requirements of lubricating oil for a methanol engine, and has excellent piston cleanliness, high/low-temperature wear resistance and a good viscosity increasing control capacity.

Description

technical field [0001] The invention relates to a lubricating oil composition, in particular to a lubricating oil composition for methanol engines. Background technique [0002] The oxidation stability of engine lubricating oil is an extremely important control index. In the process of use, the oil is affected by factors such as operating temperature, combustion products, blow-by gas, and metal catalysis, and gradually loses its antioxidant activity, and is prone to oxidative deterioration, resulting in detergency, dispersibility, and wear resistance of the oil. Suffer rapid damage, increase viscosity, increase acid products, form paint film and deposits, and cause damage to engine equipment. [0003] As a new type of alternative energy, methanol fuel has broad application prospects. During the use of methanol gasoline, it is inevitable that methanol will enter the lubricating oil. Blow-by gas during the working process of the engine and the cooling process of the engine ...

Claims

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Application Information

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