High-temperature and low-temperature universal equipment hydraulic oil

Abstract

The invention discloses high and low temperature universal equipment hydraulic oil which is composed of base oil and additives, the base oil is composed of low freezing point naphthenic base oil and ester oil, and the mass ratio of the low freezing point naphthenic base oil to the ester oil is (9-99): 1; the additives comprise a tackifier, an anti-rust agent, an antioxidant and an anti-wear agent, the mass of the tackifier accounts for 5%-15% of the mass of the base oil, the mass of the anti-rust agent accounts for 0.05%-5% of the mass of the base oil, the mass of the antioxidant accounts for 0.1%-5% of the mass of the base oil, and the mass of the anti-wear agent accounts for 0.1%-5% of the mass of the base oil. The hydraulic oil has excellent high and low temperature performance and thermal oxidation stability, has good adaptability to rubber sealing materials, and can meet the use requirements of mechanical equipment in south and north and in winter and summer.

Description

Technical Field

[0001] The invention belongs to the technical field of hydraulic oil, and in particular relates to a high- and low-temperature universal equipment hydraulic oil. Background Art

[0002] During the use of equipment, hydraulic oil plays a very important role in giving full play to the technical performance of the equipment. Hydraulic oil can transfer energy and realize the movement and operation of mechanical equipment through pressure changes in the hydraulic system; at the same time, hydraulic oil can reduce the friction between moving parts, thereby reducing wear and extending the service life of the equipment. In order to ensure that the role of hydraulic oil in the equipment can be fully exerted, strict requirements must be met for its kinematic viscosity, oxidation resistance, rust resistance, and wear resistance at high and low temperatures.

[0003] The main problems with related hydraulic oils at home and abroad are low flash point and low high-temperature kinematic viscosity, which may cause shrinkage of nitrile rubber seals and equipment oil leakage. For example, No. 15 aviation hydraulic oil is a commonly used hydraulic oil for mechanical equipment in my country. It is made of refined petroleum distillates as base oil, and is blended with appropriate amounts of polyether viscosity index improvers, antioxidants, anti-wear agents, anti-foaming agents and red dyes. It has excellent thermal stability and low-temperature performance. However, No. 15 aviation hydraulic oil has a low flash point, large evaporation loss, and low high-temperature kinematic viscosity. Long-term use will cause the rubber seals used on mechanical equipment to shrink, thereby causing equipment oil leakage.

[0004] With the development of equipment and the diversity, suddenness and wide range of usage scenarios, it is imperative to develop high- and low-temperature general-purpose equipment hydraulic oil with excellent performance to ensure that the equipment can be used in both the north and the south, and in winter and summer, reduce the damage to the equipment caused by frequent oil changes, and meet the equipment's use requirements. Summary of the invention

[0005] The purpose of the present invention is to provide a high-low temperature universal equipment hydraulic oil, which solves the problems of low flash point and low high-temperature kinematic viscosity of the existing hydraulic oil.

[0006] The technical solution adopted by the present invention is that the high and low temperature universal equipment hydraulic oil is composed of a base oil and additives, wherein the base oil is composed of a low-freezing cycloalkyl oil and an ester oil, and the mass ratio of the low-freezing cycloalkyl oil to the ester oil is 9-99:1; the additives include a viscosity enhancer, a rust inhibitor, an antioxidant and an anti-wear agent, wherein the mass of the viscosity enhancer is 5%-15% of the mass of the base oil, the mass of the rust inhibitor is 0.05%-5% of the mass of the base oil, the mass of the antioxidant is 0.1%-5% of the mass of the base oil, and the mass of the anti-wear agent is 0.1%-5% of the mass of the base oil.

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

[0008] The ester oil is diisooctyl sebacate or dibutyl sebacate.

[0009] The tackifier is polymethacrylate T602 with a carbon chain length of 7-9.

[0010] The rust inhibitor is neutral barium dinonylnaphthalenesulfonate T705A.

[0011] The antioxidant is 2,6-di-tert-butyl-p-cresol T501, high molecular weight phenol L107, octyl / pentyl diphenylamine L57 or benzotriazole derivative T551.

[0012] The anti-wear agent is tricresyl phosphate T306 or amine neutralized aliphatic alcohol phosphate Additin RC3740.

[0013] The beneficial effects of the present invention are:

[0014] The high and low temperature universal equipment hydraulic oil of the present invention is a base oil with excellent high and low temperature kinematic viscosity screened out through a large number of tests, that is, a mixed oil prepared by low-condensing cycloalkyl oil and ester oil; a thickener, rust inhibitor, antioxidant and anti-wear agent compatible with the above base oil are screened out through a large number of tests, and the optimal ratio is determined. The thickener, rust inhibitor, antioxidant and anti-wear agent can provide the oil with good high and low temperature kinematic viscosity, rust prevention performance, thermal oxidation stability and lubrication performance, respectively, so that the oil can ultimately meet the equipment use requirements. The hydraulic oil of the present invention has excellent high and low temperature performance and thermal oxidation stability, high flash point, good adaptability to rubber sealing materials, and can meet the use requirements of mechanical equipment in the north and south, winter and summer. DETAILED DESCRIPTION

[0015] The present invention is described in detail below in conjunction with specific implementation modes.

[0016] The high-low temperature universal equipment hydraulic oil of the present invention is composed of base oil and additives; the base oil is composed of low-freezing cycloalkyl oil and ester oil, wherein the mass ratio of the low-freezing cycloalkyl oil to the ester oil is 9-99:1; the additives include viscosity enhancer, rust inhibitor, antioxidant and anti-wear agent, wherein the mass of the viscosity enhancer is 5%-15% of the mass of the base oil, the mass of the rust inhibitor is 0.05%-5% of the mass of the base oil, the mass of the antioxidant is 0.1%-5% of the mass of the base oil, and the mass of the anti-wear agent is 0.1%-5% of the mass of the base oil.

[0017] The flash point of low-freezing naphthenic oil is 114°C, the freezing point is less than -60°C, and the corresponding kinematic viscosity of low-freezing naphthenic oil at 40°C, -40°C, and -50°C is 3.7 mm 2 / s, 215mm 2 / s、742mm 2 / s.

[0018] The ester oil is diisooctyl sebacate or dibutyl sebacate.

[0019] The viscosity enhancer is polymethacrylate T602 (C 7-9 ).

[0020] The rust inhibitor is neutral barium dinonylnaphthalenesulfonate T705A.

[0021] The antioxidant is 2,6-di-tert-butyl-p-cresol T501, high molecular weight phenol L107, octyl / pentyl diphenylamine L57 or benzotriazole derivative T551.

[0022] The anti-wear agent is tricresyl phosphate T306 or amine neutralized aliphatic alcohol phosphate Additin RC3740.

[0023] Embodiment 1:

[0024] The composition of the hydraulic oil in this embodiment is:

[0025] The base oil is composed of low-condensation naphthenic oil and diisooctyl sebacate, with a mass ratio of 9:1; the additives include viscosity enhancer, rust inhibitor, antioxidant and anti-wear agent, among which the viscosity enhancer is polymethacrylate T602 (C 7-9 ), the mass of which is 11% of the base oil mass; the rust inhibitor is neutral barium dinonylnaphthalenesulfonate T705A, the mass of which is 0.05% of the base oil mass; the antioxidant is 2,6-di-tert-butyl-p-cresol T501, the mass of which is 2% of the base oil mass; the anti-wear agent is tricresyl phosphate T306, the mass of which is 0.5% of the base oil mass.

[0026] The kinematic viscosity, density, pour point, flash point, wear spot diameter, oxidation stability, rubber compatibility and other properties of the hydraulic oil in Example 1 were tested. The results are shown in Table 1. It can be seen that the kinematic viscosity of the hydraulic oil prepared in this example at 40°C is 16.38 mm 2 / s, kinematic viscosity at -40℃ is 1074mm 2 / s, with better high and low temperature performance; the flash point is higher than the performance requirement of general hydraulic oil for flash point (not less than 110℃); the wear spot diameter is small, with excellent lubrication performance, good oxidation stability and high rubber compatibility.

[0027] Table 1 Hydraulic oil performance test results of Example 1

[0028]

[0029] Embodiment 2:

[0030] The composition of the hydraulic oil in this embodiment is:

[0031] The base oil is composed of low-condensation naphthenic oil and diisooctyl sebacate, with a mass ratio of 50:1; the additives include viscosity enhancer, rust inhibitor, antioxidant and anti-wear agent, among which the viscosity enhancer is polymethacrylate T602 (C 7-9 ), the mass of which is 5% of the base oil mass; the rust inhibitor is neutral barium dinonylnaphthalenesulfonate T705A, the mass of which is 5% of the base oil mass; the antioxidant is octyl / pentyl diphenylamine L57, the mass of which is 0.1% of the base oil mass; the anti-wear agent is aliphatic alcohol phosphate AdditinRC3740, the mass of which is 2% of the base oil mass.

[0032] Embodiment 3:

[0033] The composition of the hydraulic oil in this embodiment is:

[0034] The base oil is composed of low-condensation naphthenic oil and dibutyl ester, with a mass ratio of 99:1; the additives include viscosity enhancer, rust inhibitor, antioxidant and anti-wear agent, among which the viscosity enhancer is polymethacrylate T602 (C 7-9 ), the mass of which is 15% of the base oil mass; the rust inhibitor is neutral barium dinonylnaphthalenesulfonate T705A, the mass of which is 3% of the base oil mass; the antioxidant is high molecular weight phenol L107, the mass of which is 5% of the base oil mass; the anti-wear agent is tricresyl phosphate T306, the mass of which is 5% of the base oil mass.

[0035] Embodiment 4:

[0036] The composition of the hydraulic oil in this embodiment is:

[0037] The base oil is composed of low-condensation naphthenic oil and dibutyl ester, with a mass ratio of 70:1; the additives include viscosity enhancer, rust inhibitor, antioxidant and anti-wear agent, among which the viscosity enhancer is polymethacrylate T602 (C 7-9 ), the mass of which is 9% of the base oil mass; the rust inhibitor is neutral barium dinonylnaphthalenesulfonate T705A, the mass of which is 1.5% of the base oil mass; the antioxidant is a benzotriazole derivative T551, the mass of which is 3.5% of the base oil mass; the anti-wear agent is tricresyl phosphate T306, the mass of which is 0.1% of the base oil mass.

[0038] Comparative Example 1:

[0039] The same as Example 1, except that the tackifier polymethacrylate T602 (C 7-9 ) is 20% of the base oil mass.

[0040] The hydraulic oil prepared in this comparative example was tested for performance and compared with the hydraulic oil in Example 1. The results are shown in Table 2. It can be seen that the flash point of the hydraulic oil in Example 1 is much higher than that in Comparative Example 1, and the volume change rate and evaporation loss of the nitrile rubber are much lower than those in Comparative Example 1. This is because the mass ratio of the tackifier added in Comparative Example 1 is too high, resulting in a lower flash point, a larger evaporation loss, and a poorer compatibility with rubber, thereby increasing the risk of hidden dangers of causing equipment oil leakage. Therefore, the equipment hydraulic oil of the present invention has a higher flash point and better rubber compatibility.

[0041] Table 2 Performance comparison results of high and low temperature general equipment hydraulic oil and control examples

[0042] Test items Example 1 Comparative Example 1 <![CDATA[Density (20 °C), kg / m 3 > 866 —— Pour point, ℃ <-60 -65 Flash point (open), ℃ 116 82 Evaporation loss (71℃, 6h), % 5.69 20.4 Rubber compatibility (nitrile rubber, 70℃, 24h), volume change, % 3.14 16

Claims

1. High and low temperature general equipment hydraulic oil, characterized by: The invention is composed of base oil and additives, wherein the base oil is composed of low-freezing cycloalkyl oil and ester oil, and the mass ratio of low-freezing cycloalkyl oil to ester oil is 9-99:1; the additives include viscosity enhancer, rust inhibitor, antioxidant and anti-wear agent, wherein the mass of the viscosity enhancer is 5%-15% of the mass of the base oil, the mass of the rust inhibitor is 0.05%-5% of the mass of the base oil, the mass of the antioxidant is 0.1%-5% of the mass of the base oil, and the mass of the anti-wear agent is 0.1%-5% of the mass of the base oil.

2. The high and low temperature universal equipment hydraulic oil according to claim 1, characterized in that: The ester oil is diisooctyl sebacate or dibutyl sebacate.

3. The high and low temperature universal equipment hydraulic oil according to claim 1, characterized in that: The tackifier is polymethacrylate T602 with a carbon chain length of 7-9.

4. The high and low temperature universal equipment hydraulic oil according to claim 1, characterized in that: The rust inhibitor is neutral barium dinonylnaphthalenesulfonate T705A.

5. The high and low temperature universal equipment hydraulic oil according to claim 1, characterized in that: The antioxidant is 2,6-di-tert-butyl-p-cresol T501, high molecular weight phenol L107, octyl / pentyl diphenylamine L57 or benzotriazole derivative T551.

6. The high and low temperature universal equipment hydraulic oil according to claim 1, characterized in that: The anti-wear agent is tricresyl phosphate T306 or amine neutralized aliphatic alcohol phosphate Additin RC3740.

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