Lubricating oil composition capable of realizing wide-temperature-range super-lubricity

Abstract

The invention relates to the technical field of lubricating oil, and particularly discloses a lubricating oil composition capable of realizing wide-temperature-range super-lubricity. The lubricating oil composition comprises the following components in parts by weight: 20-80 parts of a compound A, 20-80 parts of a compound B, 1-2 parts of dialkenyl succinimide, 0.5-1.5 parts of a low-temperature stabilizer and 0.5-1.5 parts of an antioxidant, and the compound A and the compound B are two kinds of beta-diketones containing different benzene ring components. According to the present invention, by using the physicochemical characteristics of the two beta-diketones containing different benzene ring components, the crystallization caused by the intermolecular interaction is avoided, the fluidity of the composition under the low-temperature working condition is improved, the self-stop of the friction chemical reaction under the high-temperature working condition is ensured, and the wear resistance of the composition is improved; the super-lubricity lubricating oil composition prepared by the invention can stably exert the super-lubricity performance in a temperature range of-45 to 150 DEG C.

Description

Technical Field

[0001] The present application relates to the technical field of lubricating oils, and more specifically, to a lubricating oil composition capable of achieving super-lubricity over a wide temperature range. Background Art

[0002] Friction and wear are important causes of energy loss and failure of mechanical parts. In recent years, a large number of studies have shown that superlubrication is a good way to overcome energy loss and loss caused by friction and wear.

[0003] The prior art discloses a new type of synthetic lubricating material β-diketone, which can modify the steel surface through a tribochemical reaction with the steel surface, and can use its own strong intermolecular force to regulate the interaction of the solid-liquid interface fluid, thereby achieving super-lubricity. Among them, the tribochemical reaction between the diketone functional group and the steel surface is the key to eliminating the contact of the micro-convex bodies on the solid surface and forming a chemical adsorption layer to achieve a super-lubricity state.

[0004] Although β-diketone super-lubricant materials have great application prospects, the temperature range in which lubrication performance can be maintained is a factor that must be considered in actual industrial applications. Generally, lubricating oils are generally required to be used in a temperature range of -20 to 120°C or even wider. However, the β-diketone currently studied, due to its own structural characteristics, has a super-lubricating operating range of only room temperature to 100°C.

[0005] For low temperature conditions, β-diketones are prone to crystallization due to their liquid crystal-like molecular structure and strong intermolecular interaction. For example, the most widely studied β-diketone EPND (1-(4-ethylphenyl)nonane-1,3-dione) solidifies at around 0.6°C and loses its fluidity as a lubricant.

[0006] Under high temperature conditions, the chemical reaction activity of β-diketone and metal will increase. When the ambient temperature is too high, even if the micro-convex contact is completely eliminated after superlubricity is achieved (i.e., the flash temperature disappears), the chemical reaction will continue until the β-diketone reacts completely, causing superlubricity failure or even lubrication failure.

[0007] Therefore, for β-diketone, a special lubricating material, how to design a stable solution for use in a wider temperature range without affecting its super-lubricating performance is a technical problem that needs to be solved urgently. Summary of the invention

[0008] In order to solve the above technical problems, the present application provides a lubricating oil composition that can achieve super-lubricity in a wide temperature range. The present application mixes two β-diketones with different core benzene ring components, and auxiliary additions of low-temperature stabilizers and antioxidants. The obtained lubricating oil composition can stably exhibit super-lubricity performance within a temperature range of -45-150°C.

[0009] The present application provides a lubricating oil composition capable of achieving ultra-lubricity over a wide temperature range, which adopts the following technical solution:

[0010] A lubricating oil composition capable of achieving ultra-lubricity over a wide temperature range, comprising the following components in parts by weight:

[0011] 20-80 parts of compound A, 20-80 parts of compound B, 1-2 parts of diene succinimide, 0.5-1.5 parts of low temperature stabilizer, and 0.5-1.5 parts of antioxidant.

[0012] Compound A and compound B are two β-diketones containing different benzene ring components.

[0013] Specifically, the molecular structure of the compound A is:

[0014] R1 is C m H 2m+1 , C m H 2m OCH3 or C m H 2m OOCH3, R2 is C n H 2n+1 , C n H 2n OCH3 or C n H 2n OOCH3, where m and n are positive integers and 2≤m≤6, 2≤n≤6;

[0015] The molecular structural formula of the compound B is:

[0016] R1 is C m H 2m+1 , C m H 2m OCH3 or C m H 2m OOCH3, R2 is C n H 2n+1 , C n H 2n OCH3 or C n H 2n OOCH3, wherein m and n are positive integers and 8≤m≤10, 8≤n≤10.

[0017] β-diketone is a new type of synthetic lubricating material with super-lubricity, but its stable operating temperature range is only from room temperature to 100°C. The present application adopts a mixture of two β-diketones containing different benzene ring components to avoid the problem of reduced fluidity and crystallization at low temperatures, improve the situation of low stability and easy super-lubricity failure at high temperatures, thereby ensuring that the obtained lubricating oil has a wider operating temperature range.

[0018] More preferably, in the molecular structure of the compound A, R1 is C m H 2m OOCH3, R2 is C n H 2n OOCH3, wherein m and n are positive integers and 2≤m≤3, 2≤n≤3; in the molecular structure of the compound B, R1 is C m H 2m OOCH3, R2 is C n H 2n OOCH3, wherein m and n are positive integers and 9≤m≤10, 9≤n≤10.

[0019] More preferably, the weight ratio of compound A to compound B is 1:(2-6).

[0020] More preferably, the low-temperature stabilizer is one of polyisobutylene succinimide, 3,3-methyl dimethacrylate and poly-alpha-olefin.

[0021] More preferably, the antioxidant is a mixture of an organic cerium compound and a phenolic compound, and the weight ratio of the organic cerium compound to the phenolic compound is 1:(0.5-2).

[0022] More preferably, the organic cerium compound is alkyl cerium carboxylate or alkyl cerium sulfonate.

[0023] More preferably, the phenolic compound is monophenol or bisphenol.

[0024] The present application designs a compound with two different core benzene ring components based on β-diketone, and utilizes the physicochemical characteristics of the two β-diketones containing different benzene ring components to avoid crystallization caused by molecular interaction, improve the fluidity of the composition under low temperature conditions, and ensure the self-stopping of the friction chemical reaction under high temperature conditions.

[0025] The present application simultaneously adds a low-temperature stabilizer and an antioxidant to ensure the normal fluidity of the composition at low temperatures and the stability under high-temperature conditions, thereby further expanding the operating temperature range of the lubricating oil composition. DETAILED DESCRIPTION

[0026] The present application is further described in detail below with reference to the embodiments.

[0027] The present application provides a lubricating oil composition capable of achieving ultra-lubricity over a wide temperature range, comprising the following components in parts by weight:

[0028] 20-80 parts of compound A, 20-80 parts of compound B, 1-2 parts of diene succinimide, 0.5-1.5 parts of low temperature stabilizer, 0.5-1.5 parts of antioxidant;

[0029] The molecular structural formula of the compound A is:

[0030] R1 is C m H 2m+1 , C m H 2m OCH3 or C m H 2m OOCH3, R2 is C n H 2n+1 , C n H 2n OCH3 or C n H 2n OOCH3, where m and n are positive integers and 2≤m≤6, 2≤n≤6;

[0031] The molecular structural formula of the compound B is:

[0032] R1 is C m H 2m+1 , C m H 2m OCH3 or C m H 2m OOCH3, R2 is C n H 2n+1 , C n H 2n OCH3 or C n H 2n OOCH3, wherein m and n are positive integers and 8≤m≤10, 8≤n≤10.

[0033] The present application utilizes the physicochemical characteristics of two β-diketones containing different benzene ring components to avoid crystallization caused by intermolecular interaction, improve the fluidity of the composition under low temperature conditions, and ensure the self-stopping of the friction chemical reaction under high temperature conditions. The super-lubricating oil composition prepared by the present application can stably exert super-lubricating performance in the temperature range of -45-150°C.

[0034] Preferably, in the molecular structure of the compound A, R1 is C m H 2m OOCH3, R2 is C n H2n OOCH3, wherein m and n are positive integers and 2≤m≤3, 2≤n≤3; in the molecular structure of the compound B, R1 is C m H 2m OOCH3, R2 is C n H 2n OOCH3, wherein m and n are positive integers and 9≤m≤10, 9≤n≤10.

[0035] Preferably, the weight ratio of compound A to compound B is 1:(2-6).

[0036] Preferably, the low temperature stabilizer is one of polyisobutylene succinimide, 3,3-methyl dimethacrylate and polyalphaolefin.

[0037] Preferably, the antioxidant is a mixture of an organic cerium compound and a phenolic compound, and the weight ratio of the organic cerium compound to the phenolic compound is 1:(0.5-2).

[0038] Preferably, the organic cerium compound is alkyl cerium carboxylate or alkyl cerium sulfonate.

[0039] Preferably, the phenolic compound is monophenol or bisphenol.

[0040] The addition of low temperature stabilizers and antioxidants can ensure the normal fluidity of the composition at low temperatures and the stability under high temperature conditions, further expanding the working temperature range of the lubricating oil composition.

[0041] The present application also provides a method for preparing a lubricating oil composition that can achieve ultra-lubricity over a wide temperature range: Compound A and Compound B are mixed evenly, and diene succinimide, a low-temperature stabilizer and an antioxidant are added in sequence, and mixed evenly to obtain the composition.

[0042] Example

[0043] Example 1

[0044] A lubricating oil composition capable of achieving ultra-lubricity over a wide temperature range, comprising the following components of quality:

[0045] Compound A 20 g, compound B 80 g, diene succinimide 1 g, low temperature stabilizer 0.5 g, antioxidant 0.5 g;

[0046] The molecular structure of the compound A is:

[0047] R1 is C2H5, R2 is C2H5;

[0048] The molecular structural formula of the compound B is:

[0049] R1 is C8H 17 , R2 is C8H 17 .

[0050] The low temperature stabilizer was polyisobutylene succinimide, which was purchased from Wuhan Jiyesheng Chemical Co., Ltd.

[0051] The antioxidant is a mixture of cerium octylbenzene sulfonate and octylphenol, and the weight ratio of cerium octylbenzene sulfonate to octylphenol is 1:0.5.

[0052] Example 2

[0053] A lubricating oil composition capable of achieving ultra-lubricity in a wide temperature range, comprising 50 g of compound A, 50 g of compound B, 1.5 g of diene succinimide, 2 g of a low-temperature stabilizer, and 1 g of an antioxidant;

[0054] The molecular structural formula of the compound A is:

[0055] R1 is C4H8OCH3, R2 is C4H8OCH3;

[0056] The molecular structural formula of the compound B is:

[0057] R1 is C9H 18 OCH3, R2 is C9H 18 OCH3.

[0058] The low temperature stabilizer was polyisobutylene succinimide, which was purchased from Wuhan Jiyesheng Chemical Co., Ltd.

[0059] The antioxidant is a mixture of cerium octylbenzene sulfonate and octylphenol, and the weight ratio of cerium octylbenzene sulfonate to octylphenol is 1:0.5.

[0060] Example 3

[0061] A lubricating oil composition capable of achieving ultra-lubricity over a wide temperature range, comprising the following components of quality:

[0062] Compound A 80 g, compound B 20 g, diene succinimide 2 g, low temperature stabilizer 1.5 g, antioxidant 1.5 g;

[0063] The molecular structural formula of the compound A is:

[0064] R1 is C6H 12 OOCH3, R2 is C6H 12 OOCH3;

[0065] The molecular structural formula of the compound B is:

[0066] R1 is C 10 H 20 OOCH3, R2 is C 10 H 20 OOCH3.

[0067] The low temperature stabilizer was polyisobutylene succinimide, which was purchased from Wuhan Jiyesheng Chemical Co., Ltd.

[0068] The antioxidant is a mixture of cerium octylbenzene sulfonate and octylphenol, and the weight ratio of cerium octylbenzene sulfonate to octylphenol is 1:0.5.

[0069] Example 4

[0070] A lubricating oil composition capable of achieving ultra-lubricity over a wide temperature range, which is different from Example 1 in that, in the molecular structure of compound A, R1 is C3H6OOCH3 and R2 is C3H6OOCH3; in the molecular structure of compound B, R1 is C 10 H 20 OOCH3, R2 is C 10 H 20 OOCH3.

[0071] Example 5

[0072] A lubricating oil composition capable of achieving ultra-lubricity over a wide temperature range, which is different from Example 1 in that, in the molecular structure of compound A, R1 is C2H4OOCH3 and R2 is C2H4OOCH3; in the molecular structure of compound B, R1 is C 10 H 20 OOCH3, R2 is C 10 H 20 OOCH3.

[0073] Example 6

[0074] A lubricating oil composition capable of achieving ultra-lubricity over a wide temperature range, which is different from Example 1 in that the amounts of compound A and compound B used are 12 g and 88 g, respectively.

[0075] Example 7

[0076] A lubricating oil composition capable of achieving ultra-lubricity over a wide temperature range, which is different from Example 1 in that the amounts of compound A and compound B used are 14 g and 86 g, respectively.

[0077] Example 8

[0078] A lubricating oil composition capable of achieving ultra-lubricity over a wide temperature range, which is different from Example 1 in that the amounts of compound A and compound B used are 33 g and 67 g, respectively.

[0079] Example 9

[0080] A lubricating oil composition capable of achieving ultra-lubricity over a wide temperature range, which is different from Example 1 in that the amounts of compound A and compound B used are 50 g and 50 g, respectively.

[0081] Example 10

[0082] A lubricating oil composition capable of achieving superlubricity over a wide temperature range, which is different from Example 1 in that the antioxidant is cerium octylbenzene sulfonate.

[0083] Embodiment 11

[0084] A lubricating oil composition capable of achieving ultra-lubricity over a wide temperature range, which is different from Example 1 in that the antioxidant is octylphenol.

[0085] Example 12

[0086] A lubricating oil composition capable of achieving ultra-lubricity over a wide temperature range, which is different from Example 1 in that the antioxidant is a mixture of cerium octylbenzene sulfonate and octylphenol, and the weight ratio of cerium octylbenzene sulfonate to octylphenol is 0.5:1.

[0087] Comparative Example

[0088] Comparative Example 1

[0089] A lubricating oil composition capable of achieving ultra-lubricity over a wide temperature range, comprising the following components of quality:

[0090] Compound A 100 g, diene succinimide 1 g, low temperature stabilizer 0.5 g, antioxidant 0.5 g;

[0091] The molecular structure of the compound A is:

[0092] R1 is C2H5, R2 is C2H5;

[0093] The low temperature stabilizer was polyisobutylene succinimide, which was purchased from Wuhan Jiyesheng Chemical Co., Ltd.

[0094] The antioxidant is a mixture of cerium octylbenzene sulfonate and octylphenol, and the weight ratio of cerium octylbenzene sulfonate to octylphenol is 1:0.5.

[0095] Comparative Example 2

[0096] A lubricating oil composition capable of achieving ultra-lubricity over a wide temperature range, comprising the following components of quality:

[0097] Compound B 100 g, diene succinimide 1 g, low temperature stabilizer 0.5 g, antioxidant 0.5 g;

[0098] The molecular structural formula of the compound B is:

[0099] R1 is C8H 17 , R2 is C8H 17 .

[0100] The low temperature stabilizer was polyisobutylene succinimide, which was purchased from Wuhan Jiyesheng Chemical Co., Ltd.

[0101] The antioxidant is a mixture of cerium octylbenzene sulfonate and octylphenol, and the weight ratio of cerium octylbenzene sulfonate to octylphenol is 1:0.5.

[0102] Performance testing

[0103] The lubricating oil compositions prepared in Examples 1-12 and Comparative Examples 1-2 were tested respectively, and the melting points of the compositions were tested by differential scanning calorimetry, and the stable operating temperature range of the compositions was tested by steel ball-steel disk rotation friction. The test results are recorded in Table 1 below.

[0104] Table 1 Performance test results

[0105]

[0106]

[0107] It can be seen from the test results in Table 1 that the super-lubricating oil composition prepared in the present application has a wide operating temperature range, which can reach -45 to 150°C.

[0108] By comparing the test results of Example 1 and Comparative Examples 1-2, it can be seen that the lubricating oil composition obtained by combining two β-diketones containing different benzene ring components has better low-temperature working performance and high-temperature stability.

[0109] Comparing the test results of Examples 1, 4, and 5, it can be seen that when R1 is C m H 2m OOCH3, R2 is C n H 2n OOCH3, wherein m and n are positive integers and 2≤m≤3, 2≤n≤3, in the molecular structure of compound B, R1 is C m H 2m OOCH3, R2 is C n H 2n OOCH3, wherein m and n are positive integers and 9≤m≤10, 9≤n≤10, and the obtained lubricating oil composition has a wider operating temperature range.

[0110] Comparing the test results of Examples 1 and 6-9, it can be seen that when the weight ratio of compound A to compound B is 1:(2-6), the lubricating oil composition has the widest operating temperature range.

[0111] By comparing the test results of Examples 1 and 10-12, it can be seen that the selection of antioxidant has a greater influence on the high temperature stability of the lubricating oil. When the antioxidant is cerium octylbenzene sulfonate and octylphenol and mixed in a ratio of 1: (0.5-2), the high temperature stability of the lubricating oil is the best and can work stably at 150°C without failure.

[0112] The above is only the preferred implementation of the present application. The protection scope of the present application is not limited to the above embodiments. All technical solutions under the concept of the present application belong to the protection scope of the present application. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present application should also be regarded as the protection scope of the present application.

Claims

1. A lubricating oil composition capable of achieving super-lubricity over a wide temperature range, characterized in that: The composition comprises the following components in parts by weight: 20-80 parts of compound A, 20-80 parts of compound B, 1-2 parts of diene succinimide, 0.5-1.5 parts of low temperature stabilizer, 0.5-1.5 parts of antioxidant; The molecular structure of the compound A is: R1 is C m H 2m+1 , C m H 2m OCH3 or C m H 2m OOCH3, R2 is C n H 2n+1 , C n H 2n OCH3 or C n H 2n OOCH3, where m and n are positive integers and 2≤m≤6, 2≤n≤6; The molecular structural formula of the compound B is: R1 is C m H 2m+1 , C m H 2m OCH3 or C m H 2m OOCH3, R2 is C n H 2n+1 , C n H 2n OCH3 or C n H 2n OOCH3, wherein m and n are positive integers and 8≤m≤10, 8≤n≤10.

2. The lubricating oil composition capable of achieving super-lubricity over a wide temperature range according to claim 1, characterized in that: In the molecular structure of the compound A, R1 is C m H 2m OOCH3, R2 is C n H 2n OOCH3, wherein m and n are positive integers and 2≤m≤3, 2≤n≤3; in the molecular structure of the compound B, R1 is C m H 2m OOCH3, R2 is C n H 2n OOCH3, wherein m and n are positive integers and 9≤m≤10, 9≤n≤10.

3. The lubricating oil composition capable of achieving super-lubricity over a wide temperature range according to claim 2, characterized in that: The weight ratio of compound A to compound B is 1:(2-6).

4. The lubricating oil composition capable of achieving super-lubricity over a wide temperature range according to claim 1, characterized in that: The low temperature stabilizer is one of polyisobutylene succinimide, 3,3-dimethyl methacrylate and polyalphaolefin.

5. The lubricating oil composition capable of achieving super-lubricity over a wide temperature range according to claim 1, characterized in that: The antioxidant is a mixture of an organic cerium compound and a phenolic compound, and the weight ratio of the organic cerium compound to the phenolic compound is 1:(0.5-2).

6. The lubricating oil composition capable of achieving super-lubricity over a wide temperature range according to claim 1, characterized in that: The organic cerium compound is cerium alkyl carboxylate or cerium alkyl sulfonate.

7. The lubricating oil composition capable of achieving super-lubricity over a wide temperature range according to claim 1, characterized in that: The phenolic compound is monophenol or bisphenol.

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