A hydraulic oil composition and use thereof

Abstract

The present application relates to the field of hydraulic oil, and more particularly to a hydraulic oil composition and application thereof.The hydraulic oil composition comprises the following components by weight: 0.5-2.0% of a multifunctional additive for hydraulic oil, 15.0-25.0% of a polymethyl acrylate viscosity index improver, 0.03-0.08% of an antifoaming agent, and the balance of base oil.The hydraulic oil composition provided by the present application has excellent low-temperature performance and high-temperature safety performance, can ensure better use of the hydraulic oil product in a polar region under a low-temperature environment, and provides better lubrication protection for equipment, and thus has important application value and a broad market prospect.

Description

Technical Field

[0001] This invention relates to the field of hydraulic oils, and more particularly to a hydraulic oil composition and its application. Background Technology

[0002] With the discovery of increasing oil and gas resources in polar regions, polar resource exploitation has become a hot international topic, and the development of associated polar machinery and equipment, along with supporting hydraulic fluids, has emerged as a new trend. Polar regions experience consistently low temperatures; the average annual temperature at the North Pole is -23°C, with an average winter temperature of -34°C and minimum temperatures reaching below -50°C. To ensure normal equipment startup at low temperatures, hydraulic oils must be usable in environments below -50°C. Furthermore, the temperature fluctuation during hydraulic motor operation can reach as high as 120°C, placing even greater demands on the viscosity-temperature properties of hydraulic oils. CN112430491A provides a hydraulic oil with excellent low-temperature performance and long service life, but it cannot guarantee safety under high-temperature operating conditions, and its kinematic viscosity is high at low temperatures. Therefore, developing a hydraulic oil more suitable for polar regions to ensure the startup and operation of equipment in extremely cold areas is of great significance. Summary of the Invention

[0003] To address the aforementioned technical problems, this invention provides a hydraulic oil composition and its application to ensure better use of hydraulic oil in low-temperature environments in polar regions.

[0004] In a first aspect, the hydraulic oil composition provided by the present invention comprises the following components in parts by weight: Hydraulic oil multi-functional additive 0.5~2.0%

[0005] Polymethyl methacrylate viscosity index improver 15.0~25.0%

[0006] Antifoaming agent 0.03~0.08%

[0007] Base oil balance.

[0008] This invention optimizes the composition and dosage of the base oil, multifunctional hydraulic oil additive, polymethyl methacrylate viscosity index improver, and antifoaming agent in the low-temperature hydraulic oil composition, solving the problems of difficult low-temperature start-up and poor high-temperature safety performance in the prior art. It better achieves a balance between high-temperature operation safety under temperature changes and fluidity and lubricity under extremely low temperature conditions, providing better lubrication protection and reliable guarantee for the normal operation of equipment in polar regions. It has important application value and broad market prospects.

[0009] Preferably, the hydraulic oil composition comprises the following components in weight percentage: Hydraulic oil multi-functional additive 0.8~1.8%

[0010] Polymethyl methacrylate viscosity index improver 15.0~20.0%

[0011] Antifoaming agent 0.03~0.05%

[0012] Base oil balance.

[0013] The base oil is preferably a mineral-based base oil and / or a synthetic base oil; wherein the synthetic base oil is preferably selected from one or more of T3 base oil, PAO2 base oil, and PAO4 base oil; and / or, the mineral-based base oil is preferably II2 base oil and / or II4 base oil. Using the preferred amounts of each component and the base oil can further improve the various properties of the hydraulic oil.

[0014] Preferably, the base oil is selected from two or three of T3 base oil, PAO2 base oil, and PAO4 base oil. More preferably, the base oil is a mixture of T3 base oil and PAO4 base oil in a mass ratio of 1.8~2.0:1. In this invention, by optimizing the composition and proportion of the base oil, it is possible to better interact with the additives in the system, thereby improving the low-temperature performance and high-temperature safety of the hydraulic oil.

[0015] Preferably, the polymethacrylate viscosity index improver is viscosity index improver Vx 8-310 or viscosity index improver Vx 8-219, and more preferably viscosity index improver Vx 8-310.

[0016] Preferably, the multifunctional hydraulic oil additive of the present invention may include one or more of antioxidants, anti-wear agents, rust inhibitors, corrosion inhibitors, demulsifiers, and dispersants.

[0017] Further preferably, the multifunctional hydraulic oil additive is selected from one or more of multifunctional hydraulic oil additive 5012T, multifunctional hydraulic oil additive LZ5702, and multifunctional hydraulic oil additive Hitec 522. Further preferably, the multifunctional hydraulic oil additive is multifunctional hydraulic oil additive LZ5702. In this invention, by employing preferred viscosity index improvers and multifunctional hydraulic oil additives, the hydraulic oil composition of this invention can significantly improve its performance, thereby exhibiting better results under extreme low-temperature conditions and temperature variations.

[0018] Preferably, the antifoaming agent is selected from one or more of silicone-based antifoaming agents, non-silicone-based antifoaming agents, and composite antifoaming agents; preferably, the antifoaming agent is silicone-based antifoaming agent Munzing 154 or silicone-based antifoaming agent Munzing 155.

[0019] In this invention, the overall kinematic viscosity of the hydraulic oil composition at 40°C is 25~44 mm. 2Based on common knowledge in the field, the above-mentioned preferred conditions can be combined with each other, and the interaction of the components will bring about a significant improvement in the overall effect, thus obtaining the preferred embodiments of the present invention.

[0020] Preferably, the hydraulic oil composition comprises the following components in weight percentage: Hydraulic oil multi-functional additive 0.8~1.5%

[0021] Polymethyl methacrylate viscosity index improver 15.0~19.2%

[0022] Silicone-based antifoaming agent 0.04~0.05%

[0023] Balance of base oil T3 and base oil PAO4.

[0024] This invention further enhances the overall performance of hydraulic oil by using a preferred base oil and optimizing the dosage of multifunctional additives, polymethyl methacrylate viscosity index improvers, and antifoaming agents. In particular, this optimized formulation, through the interaction of its components, significantly improves the fluidity, lubricity, and safety of the hydraulic oil under high and low temperature conditions, ensuring more reliable operation of the hydraulic system in extreme environments.

[0025] More preferably, the hydraulic oil composition comprises the following components in weight percentage: Hydraulic oil multi-functional additive LZ5702 0.9~0.95%

[0026] Polymethyl methacrylate viscosity index improver VX 8-310 15.0~17.0%

[0027] Silicone-based antifoaming agent Munzing 154 0.04~0.05%

[0028] Synthetic base oil PAO4 27~29%

[0029] Synthetic base oil T3 balance.

[0030] Preferably, the hydraulic oil composition comprises the following components in weight percentage: Hydraulic oil multi-functional additive LZ5702 0.95%

[0031] Polymethyl methacrylate viscosity index improver VX 8-310 15.0%

[0032] Silicone-based antifoaming agent Munzing 154 0.05%

[0033] Synthetic base oil PAO4 29%

[0034] Synthetic base oil T3 balance.

[0035] Secondly, the present invention provides the application of the hydraulic oil composition as a cryogenic hydraulic oil in polar regions.

[0036] The beneficial effects of this invention are at least as follows: the hydraulic oil provided by this invention can be used in polar regions, and can be used in conditions with temperatures as low as -50°C or even below -60°C. It has significant advantages in terms of comprehensive performance in terms of high-temperature safety, viscosity-temperature properties, low-temperature performance, and shear stability. Specifically, it has a viscosity index above 300, a pour point below -60°C, a flash point above 120°C, and a kinematic viscosity of up to 1000 mmHg at -40°C. 2 With a speed below / s, the hydraulic oil can be used normally in the low-temperature environment of polar regions, providing better lubrication and protection for polar equipment. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this invention, not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0038] Unless otherwise specified, specific techniques or conditions in the embodiments of this invention shall be performed in accordance with the techniques or conditions described in the literature in this field, or in accordance with the product instructions. Devices, instruments, reagents, etc., whose manufacturers are not specified are all conventional products that can be purchased through legitimate channels. All raw materials used in this invention are readily available in the domestic market.

[0039] The hydraulic oil multifunctional additives used in the following examples are 5012T from Xinxiang Ruifeng New Material Co., Ltd., LZ5702 from Lubrizol, and Hitec 522 from Afton.

[0040] The viscosity index improvers Vx 8-310 and Vx 8-219 used in the following examples were purchased from Evonik.

[0041] The antifoaming agents Munzing 154 and Munzing 155 used in the following examples were purchased from Mengqingxin Company.

[0042] In the following examples, synthetic base oil T3 was purchased from Ninas, PAO2 and PAO4 were purchased from INEOS, and II2 and II4 were purchased from Lu'an Company.

[0043] Example 1

[0044] This embodiment provides a hydraulic oil composition with excellent viscosity-temperature properties and low-temperature performance, comprising, by weight percentage: 0.95% of hydraulic oil multifunctional additive LZ5702, 15% of viscosity index improver VX 8-310, 0.05% of silicone antifoaming agent Munzing 154, 55% of T3 base oil, and 29% of PAO4 base oil.

[0045] Prepared according to conventional methods in the art, including: stirring hydraulic oil multifunctional additive LZ5702, viscosity index improver VX8-310, T3 base oil and PAO4 base oil at 60°C for 6-8 hours, and after uniform mixing, adding silicone antifoaming agent Munzing154 and stirring at 60°C for 1-2 hours.

[0046] Example 2

[0047] This embodiment provides a hydraulic oil composition with excellent viscosity-temperature properties and low-temperature performance, comprising, by weight percentage: 0.85% of hydraulic oil multifunctional additive LZ5702, 19.1% of viscosity index improver Vx 8-219, 0.05% of silicone antifoaming agent Munzing 154, 55% of T3 base oil, and 25% of PAO2 base oil.

[0048] Prepared according to conventional methods in the art, including: stirring hydraulic oil multifunctional additive LZ5702, viscosity index improver VX8-219, T3 base oil and PAO2 base oil at 60°C for 6-8 hours, and after uniform mixing, adding silicone antifoaming agent Munzing154 and stirring at 60°C for 1-2 hours.

[0049] Example 3

[0050] This embodiment provides a hydraulic oil composition with excellent viscosity-temperature properties and low-temperature performance. The hydraulic oil composition consists of the following components in weight percentage: 1.47% Hitec 522, a multifunctional hydraulic oil additive; 15% VX8-310, a viscosity index improver; 0.03% Munzing 155, a silicone-type antifoaming agent; 55% T3 base oil; and 28.5% PAO4 base oil.

[0051] Prepared according to conventional methods in the art, including: stirring the hydraulic oil multifunctional additive Hitec 522, viscosity index improver VX 8-310, T3 base oil and PAO4 base oil at 60°C for 6-8 hours, and after uniform mixing, adding the silicone antifoaming agent Munzing 155 and stirring at 60°C for 1-2 hours.

[0052] Example 4

[0053] This embodiment provides a hydraulic oil composition with excellent viscosity-temperature properties and low-temperature performance. The hydraulic oil composition consists of the following components in weight percentage: 1.53% hydraulic oil multifunctional additive 5012T, 18.4% viscosity index improver Vx 8-219, 0.07% silicone antifoaming agent Munzing 154, 57% T3 base oil, and 23% II2 base oil.

[0054] Prepared according to conventional methods in the art, including: stirring hydraulic oil multifunctional additive H521, viscosity index improver VX8-219, T3 base oil and II2 base oil at 60°C for 6-8 hours, and after uniform mixing, adding silicone antifoaming agent Munzing154 and stirring at 60°C for 1-2 hours.

[0055] Example 5

[0056] This embodiment provides a hydraulic oil composition with excellent viscosity-temperature properties and low-temperature performance. The hydraulic oil composition consists of the following components in weight percentage: 1.8% hydraulic oil multifunctional additive 5012T, 17.15% viscosity index improver VX8-310, 0.05% silicone antifoaming agent Munzing 155, 48% T3 base oil, and 32% II2 base oil.

[0057] Prepared according to conventional methods in the art, including: stirring hydraulic oil multifunctional additive 5012T, viscosity index improver VX8-310, T3 base oil and II2 base oil at 60°C for 6-8 hours, and after uniform mixing, adding silicone antifoaming agent Munzing155 and stirring at 60°C for 1-2 hours.

[0058] Example 6

[0059] This embodiment provides a hydraulic oil composition with excellent viscosity-temperature properties and low-temperature performance. The hydraulic oil composition consists of the following components in weight percentage: 1.75% hydraulic oil multifunctional additive 5012T, 15.2% viscosity index improver Vx 8-219, 0.05% silicone antifoaming agent Munzing 154, 63% T3 base oil, and 20% II4 base oil.

[0060] Prepared according to conventional methods in the art, including: stirring hydraulic oil multifunctional additive 5012T, viscosity index improver VX8-219, T3 base oil and II4 base oil at 60°C for 6-8 hours, and after uniform mixing, adding silicone antifoaming agent Munzing154 and stirring at 60°C for 1-2 hours.

[0061] Comparative Example 1

[0062] This comparative example provides a hydraulic oil composition, using the same method as in Example 1, except that the hydraulic oil composition consists of the following components in weight percentage: 1.7% of hydraulic oil multifunctional additive LZ5704, 16% of viscosity index improver VX8-310, 0.8% of Irganox L 130 antioxidant and LZ 5150C antioxidant compounded in a weight ratio of 1:2, 56.5% of T3 base oil, and 25% of GTL3 base oil.

[0063] Comparative Example 2

[0064] This comparative example provides a hydraulic oil composition comprising the following components in weight percentage: 1.68% Hitec 522 (a multifunctional additive for hydraulic oil), 18% VX8-219 (a viscosity index improver), 0.02% Munzing 150 (a silicone-based antifoaming agent), 53.6% T3 base oil, and 26.7% GTL3 base oil.

[0065] Experimental Example 1

[0066] The viscosity-temperature properties, pour point, and copper corrosion properties of the hydraulic oil compositions of Examples 1-6 and Comparative Examples 1-2 were analyzed, and the results are shown in Table 1.

[0067] Testing standards: The relevant properties of the above-mentioned experimental objects were tested according to national standard methods. Among them, the test method for kinematic viscosity was GB / T 265, the test method for viscosity index was GB / T 1995, the test method for pour point was GB / T 3535, the test method for flash point was GB / T 3535, and the test method for copper strip corrosion was GB / T 5096.

[0068] Table 1 Performance Analysis of Hydraulic Oil Compositions

[0069] The above test results show that the hydraulic oil described in this invention exhibits excellent viscosity-temperature properties and low-temperature performance. Its pour point is below -60℃, its viscosity index is above 300, and its flash point is above 120℃, ensuring the use of hydraulic equipment in polar regions. The effect of Example 1 is particularly outstanding.

[0070] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A hydraulic oil composition, characterized in that, The components include the following components by weight: Hydraulic oil multi-functional additive 0.5~2.0% Polymethyl methacrylate viscosity index improver 15.0~25.0% Antifoaming agent 0.03~0.08% Base oil balance.

2. The hydraulic oil composition according to claim 1, characterized in that, It consists of the following components by weight: Hydraulic oil multi-functional additive 0.8~1.8% Polymethyl methacrylate viscosity index improver 15.0~20.0% Antifoaming agent 0.03~0.05% Base oil balance The base oil is preferably a mineral base oil and / or a synthetic base oil; wherein the synthetic base oil is preferably selected from one or more of T3 base oil, PAO2 base oil and PAO4 base oil; and / or, the mineral base oil is preferably II2 base oil and / or II4 base oil.

3. The hydraulic oil composition according to claim 1 or 2, characterized in that, The base oil is selected from two or three of T3 base oil, PAO2 base oil and PAO4 base oil; preferably, the base oil is T3 base oil and PAO4 base oil in a mass ratio of 1.8 to 2.0:

1.

4. The hydraulic oil composition according to any one of claims 1-3, characterized in that, The polymethacrylate viscosity index improver is viscosity index improver Vx 8-310 or viscosity index improver Vx 8-219, preferably viscosity index improver Vx 8-310.

5. The hydraulic oil composition according to any one of claims 1-4, characterized in that, The hydraulic oil multifunctional additive is selected from one or more of hydraulic oil multifunctional additive 5012T, hydraulic oil multifunctional additive LZ5702 and hydraulic oil multifunctional additive Hitec 522, preferably hydraulic oil multifunctional additive LZ5702.

6. The hydraulic oil composition according to any one of claims 1-5, characterized in that, The antifoaming agent is selected from one or more of silicone-based antifoaming agents, non-silicone-based antifoaming agents, and composite antifoaming agents; preferably, the antifoaming agent is silicone-based antifoaming agent Munzing 154 or silicone-based antifoaming agent Munzing 155.

7. The hydraulic oil composition according to any one of claims 1-6, characterized in that, It consists of the following components in weight percentage: Hydraulic oil multi-functional additive 0.8~1.5% Polymethyl methacrylate viscosity index improver 15.0~19.2% Silicone-based antifoaming agent 0.04~0.05% Balance of base oil T3 and base oil PAO4.

8. The hydraulic oil composition according to claim 7, characterized in that, It consists of the following components in weight percentage: Hydraulic oil multi-functional additive LZ5702 0.9~0.95% Polymethyl methacrylate viscosity index improver VX 8-310 15.0~17.0% Silicone-based antifoaming agent Munzing 1540.04~0.05% Synthetic base oil PAO 427~29% The balance of synthetic base oil T3.

9. The hydraulic oil composition according to claim 8, characterized in that, It consists of the following components in weight percentage: Hydraulic oil multi-functional additive LZ5702 0.95% Polymethyl methacrylate viscosity index improver VX 8-310 15.0% Silicone-based antifoaming agent Munzing 1540.05% Synthetic base oil PAO4 29% The balance of synthetic base oil T3.

10. The application of the hydraulic oil composition according to any one of claims 1-9, characterized in that, It is used as a cryogenic hydraulic fluid in polar regions.

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