Vehicle shock absorber lubricating oil composition and preparation method thereof

Abstract

The invention discloses a vehicle shock absorber lubricating oil composition, and also discloses a preparation method of the vehicle shock absorber lubricating oil, the composition comprises the following components by mass: 83.37-88.69% of base oil, 11%-16% of a viscosity index improver, 0.3-0.6% of a gear oil composite additive, and 0.01-0.03% of an anti-foaming agent, and the sum of the mass percentages of the components is 100%. The vehicle shock absorber lubricating oil composition has the advantages of few types of raw materials, simple production process, easy operation and excellent cost performance, has excellent viscosity-temperature performance and low-temperature fluidity, excellent extreme pressure wear resistance and shear stability, excellent anti-oxidation stability, excellent rubber compatibility and anti-foaming property, and can be used as a vehicle shock absorber lubricating oil composition. The shock absorber can be used for various high-grade motorcycles, cars, wagons, new energy vehicles, railway locomotives and other vehicles, and provides a stable and long-lasting shock absorption effect for vehicle shock absorbers.

Description

Technical Field

[0001] The invention belongs to the technical field of lubricating oils, and relates to a lubricating oil composition for a vehicle shock absorber. The invention also relates to a preparation method of the lubricating oil for the vehicle shock absorber. Background Art

[0002] Shock absorbers are an important part of vehicles. They can effectively mitigate or attenuate the impact and vibration of vehicles during driving, improve driving stability and comfort, and extend the service life of vehicles. Shock absorber lubricant is a necessary lubricating medium in hydraulic shock absorbers, providing a strong guarantee for the functioning of shock absorbers.

[0003] At present, most common automotive shock absorber lubricants on the market have a low viscosity index, generally below 200. When the outside temperature rises or falls, the viscosity changes greatly, resulting in large fluctuations in the damping force and an inability to provide a stable damping effect. Some shock absorber lubricants have a high viscosity index but poor shear resistance. In a short period of time, the viscosity drops significantly and a stable damping force cannot be maintained. In addition, the anti-wear extreme pressure performance of ordinary automotive shock absorber lubricants is poor, and it is difficult to pass the 2 million times shock absorber pressure bench test. After a period of use, it is prone to wear, abnormal noise and other problems, resulting in frequent replacement of shock absorbers and increased costs. Summary of the invention

[0004] The object of the present invention is to provide a vehicle shock absorber lubricating oil composition, which has excellent viscosity-temperature performance and low-temperature flow performance, excellent extreme pressure anti-wear performance and shear stability, outstanding thermal oxidation stability, excellent anti-corrosion performance, excellent rubber compatibility and anti-foaming performance.

[0005] The second object of the present invention is to provide a method for preparing the above-mentioned vehicle shock absorber lubricating oil composition.

[0006] The technical solution adopted by the present invention is that the automotive shock absorber lubricating oil composition is composed of the following components by mass percentage: 83.37% to 88.69% of base oil, 11% to 16% of viscosity index improver, 0.3% to 0.6% of gear oil composite additive, and 0.01% to 0.03% of antifoaming agent, and the sum of the mass percentages of the above components is 100%.

[0007] The present invention is also characterized in that:

[0008] The base oil is composed of three components: polyalphaolefin 2, mineral oil and synthetic ester. The ratio of polyalphaolefin 2 and synthetic ester is (4-13.4):1, and the ratio of mineral oil and synthetic ester is (1.6-4):1. The kinematic viscosity of the base oil at 40°C is 4-6 mm 2 / s.

[0009] Mineral oil is one of the industrial white oils or light white oils, and synthetic ester has a kinematic viscosity of 3 to 10 mm at 40°C. 2 / s and a pour point not higher than -44 ° C. One of the monoesters, diesters, or polyol esters.

[0010] The viscosity index improver is one of polymethacrylate, hydrogenated styrene-diene copolymer, and poly-n-butyl vinyl ether.

[0011] The antifoaming agent is one of a silicone antifoaming agent and an acrylate antifoaming agent or a combination of both.

[0012] Another technical solution adopted by the present invention is a method for preparing a lubricating oil composition for a vehicle shock absorber, which is specifically implemented according to the following steps:

[0013] Step 1, selecting 83.37-88.69% of base oil, 11%-16% of viscosity index improver, 0.3%-0.6% of gear oil composite additive, and 0.01%-0.03% of antifoaming agent, the sum of the mass percentages of the above components being 100%;

[0014] Step 2, add three base oils into the oil mixing kettle, heat to 44-64° C., and stir for 1-2 hours;

[0015] Step 3, adding a viscosity index improver to the base oil of step 2, and continuing to stir at a temperature of 44 to 64° C. for 1 to 2 hours until all the above components are uniform and transparent;

[0016] Step 4, adding the gear oil composite additive and continuing stirring for 1h to 2h;

[0017] Step 4, lowering the temperature of the oil conditioning kettle to 30-40° C., adding an antifoaming agent, and stirring at a temperature of 30-40° C. for 1-2 hours to obtain a vehicle shock absorber lubricating oil composition.

[0018] The base oil is composed of three components: polyalphaolefin 2, mineral oil and synthetic ester. The three components are fully stirred and mixed at 6064°C. The ratio of polyalphaolefin 2 and synthetic ester is (4-13.4):1, and the ratio of mineral oil and synthetic ester is (1.6-4):1. The kinematic viscosity of the base oil at 40°C is 4-6 mm 2 / s.

[0019] Mineral oil is one of the industrial white oils or light white oils, and synthetic ester has a kinematic viscosity of 3 to 10 mm at 40°C. 2 / s and a pour point not higher than -44 ° C. One of the monoesters, diesters, or polyol esters.

[0020] The viscosity index improver is one of polymethacrylate, hydrogenated styrene-diene copolymer, and poly-n-butyl vinyl ether.

[0021] The antifoaming agent is one of a silicone antifoaming agent and an acrylate antifoaming agent or a combination of both.

[0022] The beneficial effects of the present invention are:

[0023] (1) The present invention can effectively improve the sensitivity of the base oil to the viscosity index improver by limiting the ratio and viscosity of the three base oil components, so that the viscosity index improver can achieve the highest viscosity index with the lowest addition amount, thereby enabling the system to obtain excellent viscosity-temperature performance and low-temperature fluidity while having excellent shear stability and economy.

[0024] (2) The composition provided by the present invention has excellent viscosity-temperature performance, which can provide a stable damping force to the shock absorber and make the vibration reduction stable. At the same time, the shock absorber lubricating oil does not need to add a pour point depressant, has good fluidity at -44°C, and can be suitable for different climates across the country.

[0025] (3) The present invention effectively improves the defects of poly-α-olefins causing rubber shrinkage and poor compatibility with additives by introducing low-viscosity synthetic esters into the base oil component, so that the shock absorber lubricant has excellent rubber compatibility and prevents oil leakage and oil seepage from the shock absorber. At the same time, it plays a certain role in enhancing the wear resistance of the shock absorber lubricant. Thirdly, by limiting the proportion of the three components, the evaporation loss of the product is reduced as much as possible, reducing oil loss.

[0026] (4) The present invention introduces an industrial gear oil composite additive, and achieves excellent extreme pressure anti-wear, anti-rust and anti-corrosion properties, and outstanding oxidation stability at an ultra-low addition amount of 0.3% to 0.6% (the evaluation results can be seen in Table 1), providing long-term lubrication and protection for various components of the shock absorber, preventing the oil temperature from rising to the extreme after continuous shearing of the shock absorber, reducing oil oxidation, and effectively extending the service life of the shock absorber.

[0027] (4) The present invention carefully selects anti-foaming agents so that the shock absorber lubricating oil can still maintain excellent anti-foaming properties at a lower viscosity. In addition, it is verified through high-temperature aging tests that the oil can maintain good anti-foaming properties even after high-temperature aging.

[0028] In summary, the shock absorber lubricating oil composition provided by the present invention has excellent comprehensive performance and economy. To achieve the above purpose, the present invention has conducted a comprehensive and systematic study on the relationship between the base oils and the functional additive components in the shock absorber lubricating oil composition, and by adjusting the added amount, the performance of various aspects is balanced, thereby exerting the best effect. The shock absorber lubricating oil provided by the present invention can meet the lubrication requirements of hydraulic shock absorbers on various high-end vehicles. DETAILED DESCRIPTION

[0029] The present invention is described in detail below in conjunction with specific implementation modes.

[0030] The vehicle shock absorber lubricating oil composition of the present invention is composed of the following raw material components by mass percentage: 83.37-88.69% of base oil, 11%-16% of viscosity index improver, 0.3-0.6% of gear oil composite additive, and 0.01-0.03% of antifoaming agent, and the sum of the mass percentages of the above components is 100%.

[0031] Furthermore, the automotive shock absorber lubricating oil composition of the present invention comprises a base oil of polyalphaolefin 2, mineral oil and synthetic ester, the three components are fully stirred and mixed at 6064°C, the ratio of the polyalphaolefin 2 and the synthetic ester is (4-13.4):1, the ratio of the mineral oil and the synthetic ester is (1.6-4):1, and the kinematic viscosity of the base oil at 40°C is 4-6 mm 2 / s.

[0032] Furthermore, the mineral oil is one of industrial white oil and light white oil. The industrial white oil meets the technical requirements of industrial white oil (I) in NB / SH / T 0006-2017 standard, and the light white oil meets the technical requirements of light white oil (I) in NB / SH / T 0193-2014 standard. The industrial white oil is preferably No. 4, No. 7, and No. 10, and the light white oil is preferably W1-110, W1-120, W1-130, and W1-140.

[0033] Furthermore, the synthetic ester has a kinematic viscosity of 3 to 10 mm at 40°C. 2 / s, and a pour point not higher than -44 ° C., a monoester, a diester, or a polyol ester, preferably the commercially available product Nycobase 8110, diisooctyl adipate, or neopentyl glycol heptanoate.

[0034] Furthermore, the viscosity index improver is one of polymethacrylate, hydrogenated styrene-diene copolymer, and poly-n-butyl vinyl ether, preferably the commercially available product Viscoplex 7-310 or Viscoplex 8-310.

[0035] Furthermore, the gear oil additive package is an industrial gear oil additive package that meets the requirements of the medium and heavy-duty industrial enclosed gear oil GB 4903-2011 specification, and the commercially available product KunLun D4026 is preferred.

[0036] Furthermore, the antifoaming agent is one or a combination of a silicone antifoaming agent and an acrylate antifoaming agent.

[0037] The second technical solution adopted by the present invention is: a method for preparing a vehicle shock absorber lubricating oil composition, which specifically comprises the following steps: selecting 83.37-88.69% of base oil, 11%-16% of viscosity index improver, 0.3-0.6% of gear oil composite additive, and 0.01-0.03% of antifoaming agent, wherein the sum of the mass percentages of the above components is 100%; adding the base oil to an oil-adjusting kettle, heating the mixture to 44-64° C., and stirring the mixture for 1-2 hours; then adding the viscosity index improver, and continuing to stir the mixture at a temperature of 44-64° C. for 1-2 hours until all the above components are uniform and transparent; then adding the gear oil composite additive, and continuing to stir the mixture for 1-2 hours; lowering the temperature of the oil-adjusting kettle to 30-40° C., adding the antifoaming agent, and stirring the mixture at a temperature of 30-40° C. for another 1-2 hours, thereby obtaining a vehicle shock absorber lubricating oil composition.

[0038] Example 1

[0039] The vehicle shock absorber lubricating oil composition provided in this embodiment comprises:

[0040] Component A: 88.69 wt% base oil, specifically 43.2 wt% poly-alpha-olefin 2, 22.2 wt% No. 10 white oil, and 13.29 wt% neopentyl glycol heptanoate;

[0041] Component B: 11 wt% Viscoplex 7-310;

[0042] Component C: 0.3wt% gear oil additive package;

[0043] Component D: 0.01 wt% silicone antifoaming agent 200 / 6w.

[0044] The preparation process of the above-mentioned automotive shock absorber lubricating oil composition is as follows: the base oil is added to the oil mixing kettle in the above-mentioned proportion, the temperature is raised to 60°C, stirred for 1 hour, and then the viscosity index improver is added, and the stirring is continued at 60°C for 2 hours until all the above-mentioned components are uniform and transparent, and then the gear oil composite additive is added, and the stirring is continued for 1 hour. The temperature is lowered to 40°C, the anti-foaming agent is added, and the automotive shock absorber lubricating oil composition is obtained at 40°C for another 2 hours.

[0045] Example 2

[0046] The vehicle shock absorber lubricating oil composition provided in this embodiment comprises:

[0047] Component A: 86.48 wt% base oil, specifically 47.14 wt% poly-alpha-olefin 2, 23.4 wt% No. 7 white oil, and 6.04 wt% monoester Nycobase 8110;

[0048] Component B: 13 wt% Viscoplex 7-310;

[0049] Component C: 0.4wt% gear oil additive package;

[0050] Component D: 0.02 wt% of silicone antifoaming agent FOAM BAN 130B.

[0051] The preparation process of the above-mentioned automotive shock absorber lubricating oil composition is as follows: the base oil is added to the oil mixing kettle in the above-mentioned proportion, the temperature is raised to 60°C, stirred for 1 hour, and then the viscosity index improver is added, and the stirring is continued at 60°C for 2 hours until all the above-mentioned components are uniform and transparent, and then the gear oil composite additive is added, and the stirring is continued for 1 hour. The temperature is lowered to 40°C, the anti-foaming agent is added, and the automotive shock absorber lubricating oil composition is obtained at 40°C for another 2 hours.

[0052] Example 3

[0053] The vehicle shock absorber lubricating oil composition provided in this embodiment comprises:

[0054] Component A: 84.48 wt% base oil, specifically 64 wt% poly-α-olefin 2, 12.78 wt% light white oil W1-130, and 7.7 wt% diisooctyl adipate;

[0055] Component B: 14 wt% Viscoplex 7-310;

[0056] Component C: 0.4wt% gear oil additive package;

[0057] Component D: 0.02 wt% of FOAM BAN 144, a silicone-acrylate compound anti-foaming agent.

[0058] The preparation process of the above-mentioned automotive shock absorber lubricating oil composition is as follows: the base oil is added to the oil mixing kettle in the above-mentioned proportion, the temperature is raised to 60°C, stirred for 1 hour, and then the viscosity index improver is added, and the stirring is continued at 60°C for 2 hours until all the above-mentioned components are uniform and transparent, and then the gear oil composite additive is added, and the stirring is continued for 1 hour. The temperature is lowered to 40°C, the anti-foaming agent is added, and the automotive shock absorber lubricating oil composition is obtained at 40°C for another 2 hours.

[0059] Example 4

[0060] The vehicle shock absorber lubricating oil composition provided in this embodiment comprises:

[0061] Component A: 84.37 wt% base oil, specifically 67.4 wt% poly-α-olefin 2, 11.8 wt% light white oil W1-110, 4.07 wt% diisooctyl adipate;

[0062] Component B: 14 wt% Viscoplex 8-310;

[0063] Component C: 0.6 wt% of gear oil additive package;

[0064] Component D: 0.03 wt% of silicone antifoaming agent AF420.

[0065] The preparation process of the above-mentioned automotive shock absorber lubricating oil composition is as follows: the base oil is added to the oil mixing kettle in the above-mentioned proportion, the temperature is raised to 60°C, stirred for 1 hour, and then the viscosity index improver is added, and the stirring is continued at 60°C for 2 hours until all the above-mentioned components are uniform and transparent, and then the gear oil composite additive is added, and the stirring is continued for 1 hour. The temperature is lowered to 40°C, the anti-foaming agent is added, and the automotive shock absorber lubricating oil composition is obtained at 40°C for another 2 hours.

[0066] Example 4

[0067] The vehicle shock absorber lubricating oil composition provided in this embodiment comprises:

[0068] Component A: 83.49 wt% base oil, specifically 47.49 wt% poly-alpha-olefin 2, 24.1 wt% light white oil W1-120, and 10.9 wt% neopentyl glycol heptanoate;

[0069] Component B: 16 wt% Viscoplex 8-310;

[0070] Component C: 0.4wt% gear oil additive package;

[0071] Component D: 0.01 wt% of silicone antifoaming agent FOAM BAN 169.

[0072] The preparation process of the above-mentioned automotive shock absorber lubricating oil composition is as follows: the base oil is added to the oil mixing kettle in the above-mentioned proportion, the temperature is raised to 60°C, stirred for 1 hour, and then the viscosity index improver is added, and the stirring is continued at 60°C for 2 hours until all the above-mentioned components are uniform and transparent, and then the gear oil composite additive is added, and the stirring is continued for 1 hour. The temperature is lowered to 40°C, the anti-foaming agent is added, and the automotive shock absorber lubricating oil composition is obtained at 40°C for another 2 hours.

[0073] Comparative Example 1

[0074] Table 1 lists the analysis results of Examples 1 to 4, and also lists the analysis data of foreign high-end products. As can be seen from Table 1, the automotive shock absorber lubricating oil provided by the present invention has excellent viscosity-temperature performance and low-temperature flow performance, excellent extreme pressure anti-wear performance and shear stability, outstanding thermal oxidation stability, excellent corrosion resistance, and excellent anti-foaming performance. Compared with foreign high-end products, the present invention has lower evaporation loss, better oxidation stability and shear stability, and other properties are comparable to foreign high-end products.

[0075] Table 1 Analysis data of examples and foreign high-end products

[0076]

[0077]

[0078]

[0079] As shown in Table 1, the data analysis results of the appearance, kinematic viscosity, viscosity index, flash point, pour point, moisture, mechanical impurities, evaporation loss, air release value, copper sheet corrosion, liquid phase rust, anti-foaming property, maximum non-seizure load, oxidation stabilization, wear spot diameter, shear stability, etc. of Examples 1-4 and foreign high-end products are shown.

[0080] According to the data of viscosity index in the project, it can be seen that the viscosity index value of the composition of the present application is relatively high, all maintained above 320, that is, the present application has excellent viscosity-temperature performance;

[0081] According to the pour point data in the project, it can be seen that the lowest temperature at which the composition of the present application can flow is relatively low, all maintained below -40°C, that is, the present application has excellent low-temperature flow properties;

[0082] According to the data of wear spot diameter in the project, it can be seen that the wear spot diameter of the composition of the present application is less than 0.4 mm, that is, the present application has excellent anti-wear performance;

[0083] According to the maximum no-seizure load P in the project B It can be seen from the data that the composition P of the present application B The values ​​are all above 740N, which means that this application has outstanding extreme pressure performance;

[0084] According to the data of copper sheet corrosion and liquid phase corrosion in the project, it can be seen that the composition of the present application has excellent anti-rust and anti-corrosion properties;

[0085] According to the air release value and anti-foaming property in the project, it can be seen that the composition of the present application has good anti-foaming property;

[0086] According to the data of evaporation loss in the project, it can be seen that the value of evaporation loss of the composition of the present application is lower than that of foreign high-end products, that is, the present application has lower evaporation loss;

[0087] According to the data of oxidation stability in the project, it can be seen that the oxidation stability value of the composition of the present application is significantly higher than that of foreign high-end products, that is, the present application has better oxidation stability;

[0088] According to the shear stability data in the project, it can be seen that the shear stability value of the composition of the present application is lower than that of foreign high-end products, that is, the present application has better shear stability.

[0089] Of course, the present invention may have many other embodiments. Without departing from the spirit and essence of the present invention, technicians familiar with the field can make various corresponding changes and modifications based on the present invention, but these corresponding changes and modifications should all fall within the scope of protection defined by the claims attached to the present invention.

Claims

1. A lubricating oil composition for a vehicle shock absorber, characterized in that: The invention is composed of the following components by mass percentage: 83.37-88.69% of base oil, 11%-16% of viscosity index improver, 0.3%-0.6% of gear oil composite additive, and 0.01%-0.03% of antifoaming agent, and the sum of the mass percentages of the above components is 100%.

2. The vehicle shock absorber lubricating oil composition according to claim 1, characterized in that: The base oil is composed of three components: polyalphaolefin 2, mineral oil and synthetic ester. The ratio of the polyalphaolefin 2 and the synthetic ester is (4-13.4):1, and the ratio of the mineral oil and the synthetic ester is (1.6-4):

1. The kinematic viscosity of the base oil at 40°C is 4-6 mm 2 / s.

3. The vehicle shock absorber lubricating oil composition according to claim 2, characterized in that: The mineral oil is one of industrial white oil and light white oil, and the synthetic ester has a kinematic viscosity of 3 to 10 mm at 40°C. 2 / s and a pour point not higher than -45°C, one of the monoesters, diesters, or polyol esters.

4. The vehicle shock absorber lubricating oil composition according to claim 1, characterized in that: The viscosity index improver is one of polymethacrylate, hydrogenated styrene-diene copolymer, and poly-n-butyl vinyl ether.

5. The vehicle shock absorber lubricating oil composition according to claim 1, characterized in that: The antifoaming agent is one of a silicone antifoaming agent and an acrylate antifoaming agent, or a combination of both.

6. A method for preparing a lubricating oil composition for a vehicle shock absorber, characterized in that: Follow the steps below to implement it: Step 1, selecting 83.37-88.69% of base oil, 11%-16% of viscosity index improver, 0.3%-0.6% of gear oil composite additive, and 0.01%-0.03% of antifoaming agent, the sum of the mass percentages of the above components being 100%; Step 2, add three base oils into the oil blending kettle, heat to 55-65° C., and stir for 1-2 hours; Step 3, adding a viscosity index improver to the base oil of step 2, and continuing to stir at a temperature of 55 to 65° C. for 1 to 2 hours until all the above components are uniform and transparent; Step 4, adding the gear oil composite additive and continuing stirring for 1h to 2h; Step 5, lowering the temperature of the oil conditioning kettle to 30-40° C., adding an antifoaming agent, and stirring at a temperature of 30-40° C. for 1-2 hours to obtain a vehicle shock absorber lubricating oil composition.

7. The method for preparing the vehicle shock absorber lubricating oil composition according to claim 6, characterized in that: The base oil is composed of three components: polyalphaolefin 2, mineral oil and synthetic ester. The three components are fully stirred and mixed at 60±5°C. The ratio of the two components of polyalphaolefin 2 and synthetic ester is (4-13.4):1, and the ratio of the two components of mineral oil and synthetic ester is (1.6-4):

1. At the same time, the kinematic viscosity of the base oil at 40°C is 4-6 mm 2 / s.

8. The method for preparing the vehicle shock absorber lubricating oil composition according to claim 7, characterized in that: The mineral oil is one of industrial white oil and light white oil, and the synthetic ester has a kinematic viscosity of 3 to 10 mm at 40°C. 2 / s and a pour point not higher than -45°C, one of the monoesters, diesters, or polyol esters.

9. The method for preparing the vehicle shock absorber lubricating oil composition according to claim 6, characterized in that: The viscosity index improver is one of polymethacrylate, hydrogenated styrene-diene copolymer, and poly-n-butyl vinyl ether.

10. The method for preparing the lubricating oil composition for vehicle shock absorber according to claim 6, characterized in that: The antifoaming agent is one of a silicone antifoaming agent and an acrylate antifoaming agent, or a combination of both.

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