Lubricating oil with high and low temperature viscosity-temperature performance and preparation method and application thereof

Abstract

The invention relates to the technical field of lubricating oil, and discloses lubricating oil with high and low temperature viscosity-temperature performance and a preparation method and application thereof.The lubricating oil is prepared from, on the basis of the total amount of a lubricating oil composition, 60-90 wt% of ester base oil, 10-40 wt% of silicone oil base oil, 1-5 wt% of an antioxidant, 1-3 wt% of a phosphorus-containing anti-wear agent, 0.01-0.1 wt% of a corrosion inhibitor and 1-10 ppm of a defoaming agent, the lubricating oil composition can simultaneously meet high and low temperature requirements (-40 DEG C to 230 DEG C) of lubricating oil, the kinematic viscosity at 250 DEG C is not lower than 1.0 mm < 2 > / s, the kinematic viscosity at 100 DEG C is not lower than 6.0 mm < 2 > / s, and the kinematic viscosity at-40 DEG C is not higher than 17000 mm < 2 > / s.

Description

Technical Field

[0001] The present invention relates to the technical field of lubricating oils, and in particular to a lubricating oil having both high-low temperature and viscosity-temperature properties, and a preparation method and application thereof. Background Art

[0002] Ester lubricants are an important type of Class V lubricants. Because of their good boundary lubrication, they can maintain excellent lubrication even when other base oils fail. They are widely used in industrial fields such as compressors and aircraft engines as refrigeration oils, hydraulic oils, aviation lubricants, and chain oils.

[0003] With the continuous updating and development of aircraft engine technology, the temperature of its main shaft bearings continues to increase, and the specifications and quality levels of aircraft engine lubricants have undergone major changes and developments. The base oil has developed from mineral oil type, semi-synthetic type, and diester type to the currently widely used neopentyl polyol ester. There are many specifications of aircraft engine lubricants, and the two main specifications of the US military occupy a dominant position, representing the main direction of the development of world military aviation lubricants.

[0004] As turbine temperatures continue to rise, in order to meet the higher performance requirements of the engine, engine designers need aviation lubricants with better high-temperature performance. However, the prices of special oils such as fluorinated oils are relatively high, and the viscosity is higher at low temperatures. Therefore, it is necessary to develop an aviation lubricant that can take into account both high and low temperature viscosity performance. Summary of the invention

[0005] The purpose of the present invention is to overcome the problem that aviation lubricants in the prior art cannot take into account both high and low temperature viscosity requirements, and to provide a lubricant with both high and low temperature viscosity-temperature performance and a preparation method and application. The lubricant oil composition can take into account different viscosity requirements at high and low temperatures.

[0006] In order to achieve the above-mentioned purpose, the first aspect of the present invention provides a lubricating oil having both high and low temperature viscosity-temperature properties, wherein, based on the total amount of the lubricating oil composition, the lubricating oil includes 60-90wt% of an ester base oil and 10-40wt% of a silicone base oil, 1-5wt% of an antioxidant, 1-3%wt of a phosphorus-containing antiwear agent, 0.01-0.1%wt of an anti-corrosion agent and 1-10ppm of a defoaming agent.

[0007] The second aspect of the present invention provides a method for preparing a lubricating oil composition, wherein an ester base oil and a silicone base oil are heated and mixed uniformly, and then an antioxidant, a phosphorus-containing antiwear agent, an anticorrosive agent and a defoaming agent are added respectively.

[0008] A third aspect of the present invention provides a use of the above-mentioned lubricating oil in aerospace.

[0009] Through the above technical scheme, the base oil used in the present invention includes ester base oil and silicone base oil, wherein the ester base oil has good lubrication performance and high and low temperature performance, has good sensitivity to additives, low solidification point, and good viscosity-temperature performance. Silicone oil has a higher viscosity index and is used to reduce the low-temperature viscosity of the lubricating oil and increase the high-temperature viscosity. The special silicone oil has excellent high-temperature performance and does not affect the high-temperature performance of pentaerythritol ester. The lubricating oil can simultaneously meet the high and low temperature requirements of the lubricating oil (-40°C-230°C), and the kinematic viscosity at 250°C is not less than 1.0mm 2 / s, kinematic viscosity at 100℃ not less than 6.0mm 2 / s, -40℃ kinematic viscosity is not higher than 17000mm 2 / s. DETAILED DESCRIPTION

[0010] The endpoints and any values ​​of the ranges disclosed in this article are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of each range, the endpoint values ​​of each range and the individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed in this article.

[0011] In the present invention, the sum of the contents of each component is 100 wt%.

[0012] A first aspect of the present invention provides a lubricating oil, wherein, based on the total amount of the lubricating oil composition, the lubricating oil comprises 60-90wt% of an ester base oil and 10-40wt% of a silicone base oil, 1-5wt% of an antioxidant, 1-3%wt of a phosphorus-containing antiwear agent, 0.01-0.1%wt of an anti-corrosion agent and 1-10ppm of a defoaming agent.

[0013] The selection of base oil has a great influence on the high and low temperature performance of the obtained lubricating oil, wherein the content of the ester base oil can be any value within the range formed by any two values ​​of 60wt%, 65wt%, 70wt%, 75wt%, 80wt%, 85wt% and 90wt%. The content of the silicone base oil can be any value within the range formed by any two values ​​of 10wt%, 15wt%, 20wt%, 25wt%, 30wt%, 35wt% and 40wt%.

[0014] In some embodiments of the present invention, preferably, the ester base oil comprises monopentaerythritol ester and / or dipentaerythritol ester, and preferably, the kinematic viscosity of the monopentaerythritol ester and the dipentaerythritol ester at 40° C. is 15-35 mm 2 / s. The kinematic viscosity of the base oil of the present invention at 40°C may be 15 mm 2 / s, 20mm2 / s, 25mm 2 / s, 30mm 2 / s, 35mm 2 Any value within the range formed by any two values ​​in / s.

[0015] The silicone oil base oil is ethyl silicone oil or high phenyl silicone oil, and the kinematic viscosity of the ethyl silicone oil or high phenyl silicone oil at 25° C. is 200-700 mm 2 / s, preferably high phenyl silicone oil, with a kinematic viscosity of 500-700mm at 25°C 2 / s. The viscosity of high phenyl silicone oil has a great influence on the low temperature performance of the obtained lubricant. The kinematic viscosity of high phenyl silicone oil at 25°C can be 200mm 2 / s、300mm 2 / s、400mm 2 / s、500mm 2 / s、600mm 2 / s、700mm 2 Any value within the range of any two values ​​in / s, or 500mm 2 / s、550mm 2 / s、600mm 2 / s、650mm 2 / s、700mm 2 Any value within the range of any two values ​​in / s.

[0016] In some embodiments of the present invention, preferably, the antioxidant is an amine oligomer high temperature antioxidant, preferably, the amine oligomer high temperature antioxidant is selected from polymers of alkylated diphenylamine with an alkyl group of C4-C8 and / or alkylated-N-phenyl-a-naphthylamine.

[0017] In some embodiments of the present invention, preferably, the phosphorus-containing antiwear agent is selected from one or more of tricresol phosphate, amine phosphate and triphenylphosphine.

[0018] In another embodiment of the present invention, preferably, the phosphorus-containing antiwear agent comprises tricresol phosphate, amine phosphate and triphenylphosphine. Preferably, based on the total weight of the lubricating oil composition, the content of tricresol phosphate is not less than 2wt%, and the content of amine phosphate is not more than 0.1wt%.

[0019] In some embodiments of the present invention, preferably, the corrosion inhibitor is benzotriazole and its derivatives. The derivatives of benzotriazole can be alkylated benzotriazole, such as BASF's 39).

[0020] In some embodiments of the present invention, preferably, the kinematic viscosity of the lubricating oil at 250°C is not less than 1.0 mm 2 / s, kinematic viscosity at 100℃ not less than 6.0mm 2 / s, -40℃ kinematic viscosity is not higher than 17000mm 2 / s.

[0021] The second aspect of the present invention provides a method for preparing a lubricating oil composition, wherein an ester base oil and a silicone base oil are heated and mixed uniformly, and then an antioxidant, a phosphorus-containing anti-wear agent, an anti-corrosion agent and a defoaming agent are added respectively. By optimizing the structure of the oligomer high-temperature antioxidant and screening the type and amount of the anti-wear agent, the adaptability with the base oil and the synergistic effect of high-temperature performance and anti-wear performance are achieved.

[0022] The lubricating oil prepared by the method provided by the present invention still maintains good lubrication performance at high temperatures and has good fluidity at low temperatures.

[0023] A third aspect of the present invention provides a use of the above-mentioned lubricating oil in aerospace.

[0024] The application of the lubricating oil provided by the present invention is particularly suitable for high temperature environments up to 250° C. and low temperature environments as low as -40° C. in aerospace.

[0025] According to a particularly preferred embodiment of the present invention, based on the total amount of the lubricating oil, the lubricating oil includes 60-80wt% of monopentaerythritol ester or dipentaerythritol ester, 15-30wt% of high phenyl silicone oil, 3-5wt% of antioxidant, 2.5wt% of phosphorus antiwear agent, 0.05-0.1wt% of anticorrosive agent and 1-10ppm of defoaming agent, and the kinematic viscosity of the monopentaerythritol ester or dipentaerythritol ester at 40°C is 15-35mm 2 / s, the viscosity of high phenyl silicone oil at 25°C is 500-700mm 2 / s.

[0026] The present invention will be described in detail below through examples. In the following examples, the kinematic viscosity parameter is measured by the GB / T 265 method, the corrosion and oxidation stability parameters are measured by the GJB 499 method; the viscosity change is measured by the SH / T 0807 method; the acid value change is measured by the GB / T 734 method;

[0027] Monopentaerythritol ester is a product of Sinopec Lubricant Co., Ltd.;

[0028] Dipentaerythritol ester is a product of Sinopec Lubricant Co., Ltd.;

[0029] Ethyl silicone oil is a product of Shanghai Qike Company;

[0030] High phenyl silicone oil is a product of Sinopec Lubricant Co., Ltd.;

[0031] The oligomer high temperature antioxidant is a product of Sinopec Lubricant Co., Ltd., with the product code CCKY100;

[0032] The polymer of alkylated N-phenyl-a-naphthylamine is a product of BASF 06

[0033] Benzotriazole is a product of Botao Chemical Co., Ltd.;

[0034] Benzotriazole derivatives are commercially available from BASF, product code 39;

[0035] Tricresol phosphate is a product of Huihua Petroleum Additives Co., Ltd.;

[0036] Phosphate amine is BASF's 349;

[0037] Triphenylphosphine is a product of Huihua Petroleum Additives Co., Ltd.

[0038] Example 1

[0039] Based on the total amount of lubricating oil, 79.4% of monopentaerythritol ester is taken, and its kinematic viscosity at 40°C is 33.16 mm2 / s, and its kinematic viscosity at 100°C is 6.21 mm 2 / s, -40℃ kinematic viscosity is 20600mm 2 / s, adding 15% high phenyl silicone oil, its 25℃ kinematic viscosity is 287mm 2 / s, heated at 60℃ and mixed, then added 3% CCKY100, 2.5% tricresyl phosphate (TCP), 0.1% 349, and 10 ppm of defoamer T901 to obtain sample A.

[0040] Example 2

[0041] The method and weight of Example 1 are followed, except that the viscosity of the high phenyl silicone oil at 25°C is 525 mm 2 / s.

[0042] Example 3

[0043] Based on the total amount of lubricating oil, 62.4% of dipentaerythritol ester is taken, and its kinematic viscosity at 40°C is 22.87 mm 2 / s, kinematic viscosity at 100℃ is 4.92mm 2 / s, -40℃ kinematic viscosity is 6970mm 2 / s, add 30% high phenyl silicone oil, its 25℃ kinematic viscosity is 700mm 2 / s, heated at 60℃ and mixed, then added 3% CCKY100 and 2% 06, 2.5% tricresyl phosphate, 0.1% 39, and 10 ppm of defoamer T901 to obtain sample C.

[0044] Example 4

[0045] The method and weight of Example 3 were followed, except that the viscosity of the high phenyl silicone oil at 25°C was 287 mm 2 / s.

[0046] Example 5

[0047] Based on the total amount of lubricating oil, 79.4% of monopentaerythritol ester is taken, and the kinematic viscosity at 40°C is 20.37 mm 2 / s, kinematic viscosity at 100℃ is 4.48mm 2 / s, kinematic viscosity at -40℃ is 5012mm 2 / s, adding 15% high phenyl silicone oil, its 25℃ kinematic viscosity is 525mm 2 / s, heated at 60℃ and mixed, then added 3% CCKY100, 2.5% tricresyl phosphate (TCP), 0.1% 39, and 10 ppm of defoamer T901 to obtain sample E.

[0048] Example 6

[0049] Based on the total amount of lubricating oil, 65% of monopentaerythritol ester and 16% of dipentaerythritol ester are taken, wherein the kinematic viscosity of monopentaerythritol ester at 40°C is 19.67 mm2 / s, and the kinematic viscosity at 100°C is 4.39 mm 2 / s, kinematic viscosity at -40℃ is 4707mm 2 / s, the kinematic viscosity of dipentaerythritol ester at 40℃ is 37.82mm 2 / s, kinematic viscosity at 100℃ is 6.67mm 2 / s, kinematic viscosity at -40℃ is 15380mm 2 / s, add 15% ethyl silicone oil, the viscosity at 25℃ is 355mm 2 / s, heated at 60℃ and mixed, then added 1% CCKY100, 2.95% phosphorus anti-wear agent (phosphorus anti-wear agent includes 2% tricresol phosphate, 0.05% 349, 0.9% triphenylphosphine), 0.02% pyrrolidine, 0.03% 39, and 1 ppm of defoamer T901 to obtain sample F.

[0050] Example 7

[0051] The main difference between this embodiment and embodiment 6 is that the phosphorus-containing anti-wear agents selected in embodiment 6 are of multiple types, while the phosphorus-containing anti-wear agent of embodiment 7 is of a single type, specifically amine phosphate.

[0052] Based on the total amount of lubricating oil, 72% of monopentaerythritol ester and 10.95% of dipentaerythritol ester are taken, wherein the kinematic viscosity of monopentaerythritol ester at 40°C is 19.67 mm 2 / s, kinematic viscosity at 100℃ is 4.39mm 2 / s, kinematic viscosity at -40℃ is 4707mm 2 / s, the kinematic viscosity of dipentaerythritol ester at 40℃ is 37.82mm 2 / s, kinematic viscosity at 100℃ is 6.67mm 2 / s, kinematic viscosity at -40℃ is 15380mm 2 / s, add 15% ethyl silicone oil, the viscosity at 25℃ is 355mm 2 / s, heated at 60℃ and mixed, then added 1% CCKY100, 1% 349, 0.02% of triazole, 0.03% of 39, and 1 ppm of defoamer T901 to obtain sample G.

[0053] Example 8

[0054] Based on the total amount of lubricating oil, 50% of monopentaerythritol ester and 26.49% of dipentaerythritol ester are taken, wherein the kinematic viscosity of monopentaerythritol ester at 40°C is 19.67 mm 2 / s, kinematic viscosity at 100℃ is 4.39mm 2 / s, kinematic viscosity at -40℃ is 4707mm 2 / s, the kinematic viscosity of dipentaerythritol ester at 40℃ is 37.82mm 2 / s, kinematic viscosity at 100℃ is 6.67mm 2 / s, kinematic viscosity at -40℃ is 15380mm 2 / s, add 20% ethyl silicone oil, the viscosity at 25℃ is 355mm 2 / s, heated at 60℃ and mixed, then added 1% CCKY100, 2.5% tricresol phosphate, 0.01% 39, and 5 ppm of defoamer T901 to obtain sample H.

[0055] Comparative Example 1

[0056] A comparative example using pure pentaerythritol ester as the base oil.

[0057] Based on the total amount of lubricating oil, 94.4% of pentaerythritol ester was taken, and its viscosity was the same as that of Example 1, 3% of CCKY100 and 0.1% of 39, 2.5% of tricresol phosphate (TCP), and 10 ppm of defoaming agent T901 to obtain comparative sample 1.

[0058] Comparative Example 2

[0059] A comparative example using pure silicone oil as the base oil.

[0060] Based on the total amount of lubricating oil, 94.4% ethyl silicone oil was taken, and its viscosity was the same as that of Example 6. 3% CCKY100 and 0.1% 39, 2.5% of tricresol phosphate (TCP), and 10 ppm of defoaming agent T901 to obtain comparative sample 2.

[0061] The component configurations of each embodiment and comparative example are shown in Table 1 below.

[0062] Table 1 Lubricating oil composition components of each embodiment and comparative example

[0063]

[0064] The performance of samples AH obtained in Examples 1-8 and comparative samples 1 and 2 obtained in Comparative Examples 1 and 2 were tested, and the results are shown in Table 2.

[0065] Table 2 Test results

[0066]

[0067]

[0068] As can be seen from Table 2, the prepared lubricating oil composition can simultaneously meet the low temperature and high temperature (-40°C-230°C) requirements of lubricating oil, and its kinematic viscosity at 250°C is not less than 1.0 mm 2 / s, kinematic viscosity at 100℃ not less than 6.0mm 2 / s, -40℃ kinematic viscosity is not higher than 17000mm 2 / s, it has low price, relatively wide applicable temperature range, good high temperature performance and broad prospects.

[0069] On the basis of meeting the requirements of high and low temperature viscosity, the viscosity change and acid value change of Examples 2, 3 and 5 are much lower than those of other examples, and their performance is further improved. This is because the types and contents of the selected pentaerythritol ester and silicone oil, as well as the types and contents of various additives added, achieve the adaptability with the base oil and the synergistic effect of high temperature performance and antioxidant performance.

[0070] The preferred embodiments of the present invention are described in detail above, but the present invention is not limited thereto. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, including the combination of various technical features in any other suitable manner, and these simple modifications and combinations should also be regarded as the contents disclosed by the present invention and belong to the protection scope of the present invention.

Claims

1. A lubricating oil, characterized in that: Based on the total amount of the lubricating oil, the lubricating oil comprises: 60-90wt% of ester base oil, 10-40wt% of silicone base oil, 1-5wt% of antioxidant, 1-3wt% of phosphorus antiwear agent, 0.01-0.1wt% of anticorrosive agent and 1-10ppm of defoaming agent.

2. The lubricating oil according to claim 1, characterized in that The ester base oil includes monopentaerythritol ester and / or dipentaerythritol ester. Preferably, the kinematic viscosity of the monopentaerythritol ester and the dipentaerythritol ester at 40° C. is 15-35 mm 2 / s.

3. The lubricating oil according to claim 1 or 2, characterized in that: The silicone oil base oil is ethyl silicone oil or high phenyl silicone oil, and the kinematic viscosity of the ethyl silicone oil or high phenyl silicone oil at 25° C. is 200-700 mm 2 / s, preferably high phenyl silicone oil, with a kinematic viscosity of 500-700mm at 25°C 2 / s.

4. The lubricating oil according to any one of claims 1 to 3, characterized in that: The antioxidant is an amine oligomer high temperature antioxidant; Preferably, the amine oligomer high temperature antioxidant is selected from polymers of alkylated diphenylamine and / or alkylated-N-phenyl-a-naphthylamine whose alkyl groups are C4-C8.

5. The lubricating oil according to any one of claims 1 to 4, characterized in that: The phosphorus-containing antiwear agent is selected from one or more of tricresol phosphate, amine phosphate and triphenylphosphine.

6. The lubricating oil according to claim 5, characterized in that The phosphorus-containing antiwear agent includes tricresol phosphate, amine phosphate and triphenyl phosphine; Preferably, based on the total amount of the lubricating oil, the content of the tricresol phosphate is not less than 2 wt %, and the content of the amine phosphate is not more than 0.1 wt %.

7. The lubricating oil according to any one of claims 1 to 6, characterized in that: The anticorrosive agent is benzotriazole and its derivatives.

8. The lubricating oil according to any one of claims 1 to 7, characterized in that: The kinematic viscosity of the lubricating oil at 250°C is not less than 1.0 mm 2 / s, kinematic viscosity at 100℃ not less than 6.0mm 2 / s, -40℃ kinematic viscosity is not higher than 17000mm 2 / s.

9. A method for preparing lubricating oil, characterized in that: After the ester base oil and the silicone base oil are heated and mixed evenly, antioxidants, phosphorus-containing anti-wear agents, anti-corrosion agents and defoaming agents are added respectively.

10. Use of the lubricating oil according to any one of claims 1 to 9 in aerospace.

Images