Coal-based fully-synthetic low-temperature hydraulic oil and preparation method thereof

Abstract

The invention belongs to the technical field of hydraulic oil, and particularly relates to coal-based fully-synthetic low-temperature hydraulic oil and a preparation method thereof, wherein the coal-based fully-synthetic low-temperature hydraulic oil is prepared from the following components by mass: 98.0-99.5 wt% of coal-based synthetic base oil and the balance of an additive, and the coal-basedsynthetic base oil is prepared from the following components by weight: 60-90 wt% of III type and CTL4 base oil prepared from coal, 0-25 wt% of poly alpha-olefin PAO40 base oil prepared from coal, and0-5 wt% of poly alpha-olefin PAO150 base oil prepared from coal. According to the invention, the traditional base oil formula is replaced with coal-based synthetic oil, so that the hydraulic oil canhave proper viscosity and high viscosity index without a viscosity index improver, the hydraulic oil has good shear resistance, heat resistance and oxidation resistance, and the oil change period is prolonged; and the preparation method of the industrial hydraulic oil has simple and environment-friendly steps and is easy to implement.

Description

technical field [0001] The invention relates to the technical field of hydraulic oil, in particular to a coal-based fully synthetic long-life low-temperature hydraulic oil and a preparation method thereof. Background technique [0002] Hydraulic oil is the working medium for the hydraulic system to realize energy transmission, conversion and control, and also has other functions such as lubrication, rust prevention, corrosion prevention and cooling. The continuous improvement of the manufacturing level of mechanical equipment, the start-up at extremely low ambient temperature and the long-term operation of high temperature and high pressure have put forward more stringent requirements on the performance of hydraulic oil, which are mainly manifested in two aspects: 1. Oil products need to have better Excellent viscosity-temperature performance, especially low-temperature performance; 2. The life of the oil is longer, that is, the anti-oxidation ability is stronger at high tem...

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Problems solved by technology

Patent CN104059741A "A kind of industrial hydraulic oil and its preparation method" adds 30-60% polyalphaolefin synthetic oil to the base oil and still needs 8-12% viscosity index improver, but the lowest pour point is only - 15°C, it is difficult to meet the low temperature start-up of hydraulic equipment in extremely cold regions

[0004] The low-viscosity mineral base oil has a light fraction, so the flash point is low, the evaporation loss is large, and the high-temperature performance is not ideal. In addition, the high-molecular-weight viscosity index improver will be sheared and degraded during long-term use, making the viscosity smaller. In addition, the mineral base oil The oil has poor oxidation resistance at high temperature and is prone to oxidative decay. The above two factors lead to shortened oil change intervals

[0005] In summary, the current main method for increasing the viscosity index of low-temperature hydraulic oil is to rely on viscosity index improvers or a large amount of poly-α-olefin synthetic oil. The oil prepared by the above method has poor shear resistance and high temperature resistance, which leads to short oil life.

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