Efficient hydraulic oil with high viscosity indexes

A hydraulic oil, high-efficiency technology, applied in the field of hydraulic oil, to achieve the effect of improving work efficiency and fuel economy, reducing the difficulty of starting at low temperature, and reducing types

Inactive Publication Date: 2012-10-03
SHANGHAI SANY HEAVY IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to adapt the hydraulic oil to the influence of the climate, the same equipment in the prior art has VG32, VG46, and VG68 single-grade oil mixed: VG32 oil is used In low temperature climate; VG68 oil is used in high temperature climate; VG46 oil is used as general oil in normal temperature climate, this method causes management difficulties
Moreover, although the application of conventional multi-grade hydraulic oil can expand the scope of use of oil products, after a long period of operation, its additives will be seriously degraded, and it cannot meet all-season use.

Method used

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  • Efficient hydraulic oil with high viscosity indexes

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Experimental program
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Effect test

Embodiment 1

[0035] Including 84 wt% of base oil, 15.5 wt% of polymethacrylate, and 0.5 wt% of pour point depressant, antiwear agent and detergent dispersant, wherein the kinematic viscosity of the hydraulic oil at 40°C is 55.8 mm 2 / s, the kinematic viscosity at 100°C is 11 mm 2 / s, the starting viscosity at -20°C is 1847 mm 2 / s, the viscosity index is 195, and the high temperature and high shear viscosity is 3.6 mm 2 / s.

[0036] Such as Figure 4 As shown in , the viscosity-temperature curves of the high-viscosity high-efficiency hydraulic oil and VG 46 hydraulic oil in Example 1 of the present invention, the viscosity index of the high-viscosity high-efficiency hydraulic oil is 202, while the viscosity index of VG 46 is 150. It can be seen from the figure that the high-viscosity high-efficiency hydraulic oil of the embodiment of the present invention has the characteristics of high-temperature high-viscosity and low-temperature low-viscosity. High temperature and high viscosity c...

Embodiment 2

[0040] Including 79.8 wt% base oil, 19 wt% polyisobutylene, and 1.2 wt% antiwear and detergent dispersants. Among them, the kinematic viscosity of the hydraulic oil at 40°C is 61.91 mm 2 / s, the kinematic viscosity at 100°C is 12.43 mm 2 / s, the starting viscosity at -20°C is 1654 mm 2 / s, viscosity index is 204, high temperature and high shear viscosity is 3.9 mm 2 / s.

Embodiment 3

[0042]Including 82 wt% base oil, 17 wt% polymethacrylate, 1 wt% antioxidant, antiwear agent and detergent and dispersant. Among them, the kinematic viscosity of the hydraulic oil at 40°C is 59.7 mm 2 / s, the kinematic viscosity at 100°C is 11.9 mm 2 / s, the starting viscosity at -20°C is 1546 mm 2 / s, viscosity index is 200, high temperature and high shear viscosity is 3.7 mm 2 / s.

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Abstract

The invention provides an efficient hydraulic oil with high viscosity indexes, belonging to the technical field of mechanical oil product. The efficient hydraulic oil comprises 75-85 wt% of base oil, 15-25 wt% of viscosity-index modifier and 0.5-2wt% of functional additive, wherein the kinematic viscosity of the hydraulic oil is 58 plus or minus 4mm<2> / s at the temperature of less than 40 DEG C, and the kinematic viscosity is 12 plus or minus 1mm<2> / s at the temperature of less than 100 DEG C, and the starting viscosity is less than or equal to 2156 mm <2> / s at the temperature of minus 20 DEG C, the viscosity index is 200 plus or minus 5, and the high-temperature high-shearing viscosity is more than or equal to 3.5 mm <2> / s. According to the efficient hydraulic oil with the high viscosity indexes disclosed by the invention, through improving the viscosity indexes, the usage temperature range is expanded, the shearing stability of the oil product is improved and the viscosity temperature stability of the oil product is guaranteed.

Description

technical field [0001] The invention relates to a hydraulic oil, in particular to a high-viscosity high-efficiency hydraulic oil suitable for an excavator hydraulic oil system. Background technique [0002] The application of oil products is limited by the application temperature. In order to solve the limited problem, the general method in the domestic market is: according to different temperatures, three anti-wear hydraulic oils with viscosities of VG32, VG46 and VG68 are used for different applications. Mixed temperature and temperature; or choose HV low-temperature hydraulic oil with viscosity grade VG46, which can meet the low-temperature start-up requirements at -20°C, but the viscosity parameters of the hydraulic oil in the high-temperature stage are not ideal. If the operating temperature exceeds 75°C, the efficiency of the hydraulic system will suffer. Obvious reduction. [0003] Before the present invention, the inventors found at least the following problems in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10M145/14C10M143/00C10N30/02
Inventor 曹东辉李坤王宁辉
Owner SHANGHAI SANY HEAVY IND
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