Hydraulic retarder oil composition

Abstract

The invention discloses a long-life hydraulic retarder oil composition which comprises the following components in percentage by weight: 6-8% of polyol ester; 11 to 12% of metallocene poly alpha olefin (mPAO); 13.2-17% of a composite additive; 0.6%-1.0% of an antioxidant; 0.8%-1.2% of a metal corrosion inhibitor; 0.2 to 0.4 percent of pour point depressant; and the balance of hydrogenated base oil. The high-viscosity mPAO is adopted to replace a traditional viscosity index improver, and is compounded with the metal corrosion inhibitor, so that the thermal oxidation stability of the oil product is improved, the catalytic aging process of the metal to the oil product is reduced, the generation of oil sludge and carbon deposition is reduced, and the corrosion of copper metal parts is effectively inhibited; and the corrosion performance of the oil product on metal parts of the hydraulic retarder is reduced under a high-temperature condition, so that the service life of the oil product is prolonged, and the oil change mileage can reach 300,000 kilometers.

Description

Technical Field

[0001] This invention relates to lubricating oil compositions, and more particularly to a hydraulic retarder oil composition. Background Technology

[0002] Hydraulic retarders, as an important auxiliary braking device for vehicles, are widely used in commercial vehicles such as heavy-duty trucks and buses. They generate braking torque by agitating the working fluid. During this process, the working fluid absorbs and dissipates a large amount of kinetic energy, causing the oil temperature to rise rapidly in a very short time, often reaching over 160°C, and even momentarily exceeding 180°C. These extreme working conditions place extremely stringent requirements on the lubricating oil.

[0003] Currently, some hydraulic retarders on the market use engine oil or gear oil as their working medium. However, these oils have the following inherent defects: 1. Poor high-temperature corrosion resistance: Under continuous high temperatures, sulfur in the oil easily reacts with metal parts, especially copper, causing corrosion of copper parts and further catalyzing oil aging and deterioration; 2. Insufficient thermal oxidation stability: Under continuous high temperatures, base oil and additives are prone to oxidation and cracking, leading to increased oil viscosity, sludge and carbon deposits, clogging the fine oil passages and heat exchangers inside the retarder, resulting in decreased efficiency or even failure; 3. Short service life: Due to rapid oxidation and decay, frequent oil changes are required, increasing user maintenance costs and downtime. Therefore, developing a dedicated hydraulic retarder oil that can withstand long-term high temperatures, resist metal corrosion, reduce carbon and sludge buildup, and thus significantly extend oil change intervals and equipment life has significant practical significance and market value. Summary of the Invention

[0004] Purpose of the invention: The purpose of this invention is to provide a long-life lubricant specifically designed for the harsh operating conditions of hydraulic retarders.

[0005] Technical solution: The hydraulic retarder oil composition of the present invention comprises the following components by weight percentage: Polyol esters 6-8%; metallocene polyalphaolefin mPAO 11-12%; composite additives 13.2-17%; antioxidants 0.6-1.0%; metal corrosion inhibitors 0.8-1.2%; pour point depressants 0.2-0.4%; hydrotreated base oil: balance.

[0006] Preferably, the kinematic viscosity of the polyol ester at 100°C is 4-6 mm. 2 / s.

[0007] Preferably, the metallocene polyalphaolefin mPAO has a kinematic viscosity of 150~350 mmHg at 100°C. 2 / s, more preferably, the kinematic viscosity at 100°C is 300 mm³ / s. 2 / s.

[0008] Preferably, the metal corrosion inhibitor is at least one selected from benzotriazole derivatives, alkylthiadiazoles, imidazoline derivatives, and N-acylsarcosine.

[0009] Preferably, the metal corrosion inhibitor is composed of an imidazoline derivative and N-acylsarcosine in a mass ratio of 1:0.6~1.4.

[0010] Preferably, the composite additive meets the technical specifications D1 in GB 11122-2025, including detergents and dispersants, antioxidants and corrosion inhibitors, anti-wear additives, antioxidants, rust inhibitors and friction modifiers.

[0011] Preferably, the antioxidant is at least one of amine antioxidants and phenolic antioxidants.

[0012] Preferably, the antioxidant is a combination of amine and phenolic antioxidants in a mass ratio of 3:5 to 2:1.

[0013] More preferably, the amine antioxidant is at least one of octyl diphenylamine, butyl diphenylamine, nonyl diphenylamine, and alkyl diphenylamine.

[0014] Further preferably, the phenolic antioxidant is a phenolic antioxidant, such as T501.

[0015] Preferably, the pour point depressant is of the polymethacrylate type.

[0016] Preferably, the hydrotreated base oil is at least one of Group II 500N, Group III 100N, and Group III 150N.

[0017] Beneficial Effects: Compared with existing technologies, this invention has the following significant advantages: This invention inhibits the corrosion of copper metal components by compounding metal corrosion inhibitors, reduces the catalytic aging process of oil caused by corrosive metals, improves thermal oxidation stability, reduces sludge formation, and reduces the corrosiveness of oil to hydraulic retarder metal components under high-temperature conditions, thereby extending the service life of the oil to 300,000 kilometers. Simultaneously, it uses metallocene mPAO instead of traditional viscosity index improvers, reducing carbon deposit formation under high-temperature conditions. Attached Figure Description

[0018] Figure 1 This is an appearance diagram of the adhesive board test in Embodiment 1 of the present invention.

[0019] Figure 2 This is an appearance diagram of the adhesive board test in Embodiment 2 of the present invention.

[0020] Figure 3 This is an appearance diagram of the adhesive board test in Embodiment 3 of the present invention.

[0021] Figure 4 This is an appearance diagram of the adhesive sheet test in Embodiment 6 of the present invention.

[0022] Figure 5 This is an appearance diagram of the adhesive sheet test in Embodiment 7 of the present invention.

[0023] Figure 6 This is a visual representation of the test results of the adhesive sheet in Comparative Example 1 of this invention.

[0024] Figure 7 This is a visual representation of the adhesive sheet used in the comparative example 2 of this invention.

[0025] Figure 8 This is a visual representation of the test results of the adhesive sheet in Comparative Example 3 of this invention.

[0026] Figure 9 This is a visual representation of the test results of the adhesive sheet in Comparative Example 4 of this invention. Detailed Implementation

[0027] The technical solution of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0028] The copper corrosion resistance of oil products was evaluated using GB / T 5096; the anti-aging performance of oil products was evaluated by testing the increase in acid value after aging using SH / T 0192; and the carbon deposit formation of oil products was evaluated using SH / T 0300.

[0029] All raw materials used in this invention can be purchased from the market.

[0030] Example 1

[0031] It consists of 66.7 kg of Group III 100N base oil; 6 kg of polyol ester; 11 kg of metallocene PAO300; 13.7 kg of composite additive 1 (purchased from Infineum); 0.6 kg of amine antioxidant octyl diphenylamine; 0.4 kg of phenolic antioxidant T501; 0.6 kg of imidazoline derivative; 0.6 kg of N-acylsarcosine; and 0.4 kg of polymethyl methacrylate type pour point depressant.

[0032] Example 2

[0033] It consists of 66.2 kg of Group III 100N base oil; 7 kg of polyol ester; 11.5 kg of metallocene PAO300; 13.2 kg of compound additive 2 (purchased from Afton); 0.5 kg of amine antioxidant butyl diphenylamine; 0.3 kg of phenolic antioxidant T501; 0.5 kg of imidazoline derivative; 0.5 kg of N-acylsarcosine; and 0.3 kg of polymethyl methacrylate type pour point depressant.

[0034] Example 3

[0035] It consists of 61.4 kg of Group III 100N base oil; 8 kg of polyol ester; 12 kg of metallocene PAO300; 17 kg of compound additive 3 (purchased from Lubrizol); 0.4 kg of amine antioxidant nonyldiphenylamine; 0.2 kg of phenolic antioxidant T501; 0.4 kg of imidazoline derivative; 0.4 kg of N-acylsarcosine; and 0.3 kg of polymethacrylate type pour point depressant.

[0036] Example 4

[0037] It consists of 66.2 kg of Group III 150N base oil; 7 kg of polyol ester; 11.5 kg of metallocene PAO300; 13.2 kg of composite additive 2; 0.4 kg of amine antioxidant alkyl diphenylamine; 0.4 kg of phenolic antioxidant T501; 1 kg of benzotriazole derivative; and 0.3 kg of pour point depressant.

[0038] Example 5

[0039] It consists of 66.2 kg of Group II 500N base oil; 7 kg of polyol ester; 11.5 kg of metallocene PAO300; 13.2 kg of compound additive 2; 0.3 kg of amine antioxidant octyl diphenylamine; 0.5 kg of phenolic antioxidant T501; 0.2 kg of alkyl thiadiazole; 0.8 kg of N-acyl sarcosine; and 0.3 kg of pour point depressant.

[0040] Example 6

[0041] The difference from Example 1 is that 67.1 kg of Group III base oil was added; no amine antioxidants were added, and 0.6 kg of phenolic antioxidants were added; the rest remained the same.

[0042] Example 7

[0043] The difference from Example 1 is that 67.1 kg of Group III base oil was added; phenolic antioxidants were not added; the rest remained the same.

[0044] Comparative Example 1 The difference from Example 1 is that 67.3 kg of Group III base oil was added; no antioxidant was added; the rest remained the same.

[0045] Comparative Example 2 The difference from Example 1 is that 67.3 kg of Group III base oil was added; no metal corrosion inhibitor was added; the rest remained the same.

[0046] Comparative Example 3 The difference from Example 1 is that 68.9 kg of Group III base oil was added; antioxidants and metal corrosion inhibitors were not added; the rest remained the same.

[0047] Comparative Example 4 It consists of 67.7 kg of Group III base oil; 6 kg of polyol ester; 10 kg of ethylene-propylene copolymer; 13.7 kg of composite additive 1; 0.6 kg of amine antioxidant; 0.4 kg of phenolic antioxidant; 0.6 kg of imidazoline derivative; 0.6 kg of N-acylsarcosine; and 0.4 kg of pour point depressant.

[0048] Table 1. Composition of Examples 1-7 and Comparative Examples 1-4

[0049] Table 2. Physicochemical property test data of Examples 1-7 and Comparative Examples 1-4

[0050] As can be seen from the data in Table 2: Examples 1-3 and Examples 6-7 show that the synergistic effect of the two types of antioxidants has good antioxidant performance; Examples 1-3 and Comparative Examples 1-3 show that under the condition of simultaneous presence of antioxidants and metal corrosion inhibitors, the oxidation of oil products can be effectively slowed down, and the increase in acid value is small; Examples 1-7 and Comparative Examples 1-3 and Comparative Example 4 show that using metallocene mPAO to replace the traditional viscosity indexing agent ethylene-propylene copolymer can effectively reduce the formation of carbon deposits under high temperature conditions (from the carbon deposit weight of the gelled plate test, it can be seen that Comparative Example 4 has the largest carbon deposit weight). Figure 9 (The surface area of ​​carbon is the largest).

Claims

1. A hydraulic retarder oil composition, characterized in that, It includes the following components by weight percentage: Polyol esters 6-8%; metallocene polyalphaolefin mPAO 11-12%; composite additives 13.2-17%; antioxidants 0.6-1.0%; metal corrosion inhibitors 0.8-1.2%; pour point depressants 0.2-0.4%; hydrotreated base oil: balance.

2. The hydraulic retarder oil composition according to claim 1, characterized in that, The kinematic viscosity of the polyol ester at 100°C is 4~6 mm. 2 / s.

3. The hydraulic retarder oil composition according to claim 1, characterized in that, The metallocene polyalphaolefin mPAO has a kinematic viscosity of 150~350 mmHg at 100℃. 2 / s.

4. The hydraulic retarder oil composition according to claim 1, characterized in that, The metal corrosion inhibitor is at least one of the following: benzotriazole derivative, alkylthiadiazole, imidazoline derivative, and N-acylsarcosine.

5. The hydraulic retarder oil composition according to claim 4, characterized in that, The metal corrosion inhibitor is composed of an imidazoline derivative and N-acylsarcosine in a mass ratio of 1:0.6~1.

4.

6. The hydraulic retarder oil composition according to claim 1, characterized in that, The composite additive meets the technical specifications D1 in GB11122-2025 and includes detergents, dispersants, antioxidants, corrosion inhibitors, anti-wear additives, antioxidants, rust inhibitors, and friction modifiers; the manufacturers of the composite additive include Infineon Technologies, Afton, and Lubrizol.

7. The hydraulic retarder oil composition according to claim 1, characterized in that, The antioxidant is at least one of amine and phenolic antioxidants.

8. The hydraulic retarder oil composition according to claim 7, characterized in that, The antioxidant is a combination of amine and phenolic antioxidants, in a mass ratio of 3:5 to 2:

1.

9. The hydraulic retarder oil composition according to claim 1, characterized in that, The pour point depressant is of the polymethyl methacrylate type.

10. The hydraulic retarder oil composition according to claim 1, characterized in that, The hydrotreated base oil is at least one of Group II 500N, Group III 100N, and Group III 150N.

Images