Anti-shearing long-life power steering fluid composition

A technology for power steering and oil composition, applied in the directions of lubricating composition, petroleum industry, additives, etc., can solve the problems of inflexibility, drop, poor shear resistance, etc., achieve simple preparation method, reasonable raw material compatibility, high viscosity The effect of the index

Active Publication Date: 2013-07-03
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Domestic and foreign vehicle power steering systems mainly use 6#, 8# hydraulic transmission fluid and ATF automatic transmission fluid. Since they are not special oil products, they cannot meet the main performances such as oxidation resistance and shear resistance. Power steering system requirements
[0005] To sum up, with the wide application of power steering systems in automobiles, the actual application conditions have become more harsh and complex, and higher requirements have been put forward for the oil products used in them in terms of shear resistance and oxidation resistance. The oil used in the power steering system has disadvantages such as poor shear resistance and insufficient oxidation resistance, so that after the oil in the power steering system has been working for a period of time, the viscosity of the oil decreases significantly after shearing, and the oil oxidizes and discolors to produce sludge. Causes oil leaks and rough motion in the steering system
Moreover, there is no product that meets the requirements of anti-oxidation and anti-shear performance of power steering system at the same time.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Get octyl / butyl diphenylamine (IRGANOX L57) 0.2kg, IRGANOX L1180.5kg, anti-wear hydraulic oil composite additive T50220.6kg, polymethacrylate (Degussa (China) Investment Co., Ltd. 8-100) 12kg, pentaerythritol tetraoleate 5kg, and then sequentially added to 81.7kg of 100 ° C kinematic viscosity of 4.2mm 2 / s base oil, mixed and stirred at 50°C for 3 hours to prepare a power steering oil composition.

[0029] After testing, the product has a viscosity index of 203, a viscosity shear drop rate of 1.7% at 100°C, and the time for the acid value to reach 2.0 mgKOH / g after oxidation is greater than 8000 hours.

Embodiment 2

[0031] Get octyl / butyl diphenylamine (T557) 0.3kg, IRGANOX L1180.2kg, anti-wear hydraulic oil composite additive T50220.85kg, polymethacrylate (Degussa (China) Investment Co., Ltd. 8-100) 20kg, pentaerythritol tetraoleate 8kg, and then sequentially added to 70.65kg of 100 ℃ kinematic viscosity of 2.0mm 2 / s base oil, mixed and stirred at 65°C for 1.5 hours to prepare a power steering oil composition.

[0032] After testing, the viscosity index of the product is 207, the shear drop rate of viscosity at 100°C is 2.9%, and the time for the acid value to reach 2.0mgKOH / g after oxidation is longer than 8000h.

Embodiment 3

[0034] Get octyl / butyl diphenylamine (T557) 0.3kg, IRGANOX L1180.3kg, anti-wear hydraulic oil composite additive LZ5703 0.75kg, polymethacrylate (Degussa (China) Investment Co., Ltd. 8-100) 16kg, pentaerythritol tetraoleate 6kg, and then sequentially added to 76.65kg of 100 ℃ kinematic viscosity of 2.9mm 2 / s base oil, mixed and stirred at 60°C for 2 hours to prepare a power steering oil composition.

[0035] After testing, the product has a viscosity index of 201, a viscosity shear drop rate of 2.1% at 100°C, and the time for the acid value to reach 2.0 mgKOH / g after oxidation is greater than 8000 hours.

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Abstract

The invention provides an anti-shearing long-life power steering fluid composition, comprising the following ingredients: 0.2-0.3 wt% of alkyl diphenylamine, 0.2-0.5 wt% of liquid phenolic anti-oxidant, 0.6-0.85 wt% of anti-wear hydraulic oil composite additive, 12-20 wt% of polymethacrylate, 5-8 wt% of pentaerythritol tetra oleate, and the balance consisting of base oil. The power steering fluidcomposition has extremely high viscosity index, simultaneously has excellent anti-shearing performance and high antioxidant performance. The invention has the advantages of reasonable compatibility of raw material, simple preparation method, easy obtainment of raw material, and long service life, and the invention exceeds the performance of similar products or products at home and abroad, and is suitable for the hydraulic power assisted steering system of various passenger vehicles, commercial vehicles and other various engineering vehicles and the like.

Description

technical field [0001] The present invention relates to a lubricating oil composition, in particular to a shear-resistant long-life power steering oil, which is suitable for hydraulic power steering systems of various passenger cars, commercial vehicles and other types of engineering vehicles, etc., belonging to chemical industry. Background technique [0002] The automobile power steering gear is used to convert part of the mechanical energy output by the engine (or motor) into pressure energy, and provide power assist for the driver during the steering process, so as to reduce his physical exertion during the steering action. According to the difference of energy transfer medium, there are two types of power steering gears: pneumatic type and hydraulic type. Among them, the working pressure of the hydraulic power steering gear can be as high as 10MPa or more, so the size of its components is very small. The hydraulic system is characterized by noiseless operation, short ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10M161/00C10N40/08C10N30/10
Inventor 汤涛陈惠卿万福新李万英王向阳韦安柱
Owner CHINA PETROLEUM & CHEM CORP
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