A mineral oil type vacuum pump oil composition and its preparation method and application

Abstract

This invention proposes a mineral oil-based vacuum pump oil composition, its preparation method, and its application. By adding a demulsifier and rust inhibitor in appropriate proportions, the composition exhibits excellent water separation during use, effectively extending the oil change cycle and achieving favorable technical results. The vacuum pump oil composition exhibits excellent demulsification and rust prevention properties.

Description

Technical Field

[0001] The present invention belongs to the technical field of petroleum and petrochemicals, and in particular relates to a mineral oil type vacuum pump oil composition, a preparation method and an application thereof. Background Art

[0002] Vacuum technology permeates every sector of the national economy and is widely used in metallurgy, coating, petrochemicals, aerospace, and scientific research. Vacuum pump oil is a specialized lubricant for mechanical vacuum pumps, providing lubrication, sealing, and cooling within vacuum equipment. Many applications, such as cold chain operations, medicinal materials processing, and other processes, involve high levels of moisture. Excessive moisture drawn into the pump cavity can emulsify the vacuum pump oil, leading to increased vacuum levels and oil failure.

[0003] Patent CN 106433862, "A Vacuum Pump Oil," discloses a vacuum pump oil that uses multiple synthetic base oils and additives to exhibit viscosity-temperature characteristics, oxidation stability, and anti-wear properties. Patent CN112481003A, "A 100# High-Quality Vacuum Pump Oil and Its Preparation Method," discloses a vacuum pump oil that uses 500N base oil, molecularly distilled, and then added with antioxidants, phosphate esters, and defoaming agents. This vacuum pump oil exhibits good oxidation stability and excellent thermal stability. Neither of these two patents demonstrates demulsification or rust resistance.

[0004] Therefore, it is urgent to develop a mineral oil type vacuum pump oil with excellent anti-emulsification ability and anti-rust performance. Summary of the Invention

[0005] In order to solve the above problems in the prior art, the present invention provides a mineral oil vacuum pump oil composition, a preparation method and an application thereof.

[0006] In a first aspect, the present invention provides a mineral oil vacuum pump oil composition, which comprises, by weight, the following components:

[0007]

[0008]

[0009] As a specific embodiment of the present invention, the antioxidant includes at least one of 2,6-di-tert-butyl-p-cresol, alkylated diphenylamine (CAS: 68921-45-9), and phenyl-α-naphthylamine. Examples of antioxidants suitable for use in the present invention include, but are not limited to, antioxidant T501 and antioxidant T531.

[0010] As a specific embodiment of the present invention, the metal passivator includes at least one of an indole derivative, a benzotriazole derivative, and a thiadiazole derivative. Examples of metal passivators suitable for use in the present invention include, but are not limited to, Metal Passivator T551 and Metal Passivator T552. It is believed that metal passivators can form chelates with metal ions or form a protective film on the metal surface, inhibiting the catalytic effect of the metal or its ions on the oxidation process. They can also act as copper corrosion inhibitors, anti-wear agents, and rust inhibitors.

[0011] As a specific embodiment of the present invention, the rust inhibitor comprises at least one of alkenyl succinic acid, alkenyl succinates, complexes of amino acid derivatives and amines, or alkenyl succinic acid amide derivatives. Examples of rust inhibitors suitable for use in the present invention include, but are not limited to, T746, T747, K1031, and RC4802. It is believed that the rust-inhibiting molecules in these rust inhibitors form an adsorptive protective film on metal surfaces, solubilizing water and polar substances and displacing water on the metal surface, thereby dehydrating the metal.

[0012] In a specific embodiment of the present invention, the demulsifier comprises a condensate of an amine and an epoxide or a polyether. Examples of demulsifiers suitable for use in the present invention include, but are not limited to, demulsifier T1001 or demulsifier LZ5957. Demulsifiers are believed to increase the interfacial tension between oil and water, causing a stable emulsion to become thermodynamically unstable, thereby destroying the emulsion and achieving oil-water separation.

[0013] In specific embodiments of the present invention, the rust inhibitor is selected from one or more of RC4801 and T746, and / or the demulsifier is selected from one or more of LZ5957 and T1001. The inventors have discovered that when the rust inhibitors RC4801 and / or T746 are used in combination with demulsifiers, the mineral vacuum pump oil composition of the present invention exhibits improved demulsification properties. For example, in some preferred embodiments, the rust inhibitor is T746, and / or the demulsifier is T1001.

[0014] As a specific embodiment of the present invention, the antifoaming agent includes at least one of polysiloxane and polyacrylate. For example, the antifoaming agent with the trade name AMH2 purchased from BASF, Germany can be used.

[0015] As a specific embodiment of the present invention, the base oil is API Class I paraffin base oil, for example, base oil HVI Ib500.

[0016] The present invention adds a demulsifier and a rust inhibitor in a suitable ratio to API Class I paraffin-based base oil. During the use of the oil product, the demulsifier can increase the interfacial tension between oil and water, thereby achieving the effect of oil-water separation; the polar groups in the rust inhibitor have a strong adsorption force on the metal surface, forming a tight protective layer on the metal surface to prevent the contact of the corrosive medium with the metal, thereby playing a rust-proof role; at the same time, the added metal passivator can form a chelate with the metal ion or form a protective film on the metal surface, thereby not only inhibiting the catalytic effect of the metal or its ion on the oxidation process, becoming an effective antioxidant, but also playing the role of a copper corrosion inhibitor and an anti-wear agent, and further enhancing the rust-proof effect.

[0017] The above raw materials in the present invention can be prepared in-house or purchased commercially, and the present invention is not particularly limited thereto.

[0018] In a second aspect, the present invention provides a method for preparing the mineral oil-based vacuum pump oil composition, comprising: mixing a plurality of additives with a base oil, and filtering to obtain the turbine oil composition.

[0019] As a specific embodiment of the present invention, the mixing method is heating and stirring; the temperature of the heating and stirring is preferably 55° C. to 60° C., and the time is preferably 1 to 2.5 hours.

[0020] In a third aspect, the present invention provides an application of the mineral oil vacuum pump oil composition in the field of sealing or lubrication of a mechanical vacuum pump (especially a mechanical vacuum pump with low vacuum requirements).

[0021] As a specific embodiment of the present invention, the mineral oil vacuum pump oil composition is used in the sealing and lubrication fields of mechanical vacuum pumps with medium and low vacuum requirements, and is particularly suitable for applications requiring demulsification, such as working conditions with high moisture content.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. The present invention adds a demulsifier, a rust inhibitor, etc. in a suitable ratio to the vacuum pump oil composition. During the use of the oil, the demulsifier can increase the interfacial tension between oil and water, thereby achieving the effect of oil-water separation; the polar groups in the rust inhibitor have a strong adsorption force on the metal surface, forming a tight protective layer on the metal surface, preventing the corrosive medium from contacting the metal, thereby playing a rust-proof role.

[0024] 2. It can be seen from the examples that the mineral oil-based vacuum pump oil of the present invention has excellent anti-emulsification performance and excellent anti-rust performance.

[0025] 3. The preparation method of the present invention is simple and easy to operate, and is suitable for wide promotion. DETAILED DESCRIPTION

[0026] The present invention will be further described below with reference to specific examples, but they do not constitute any limitation to the present invention.

[0027] In the various embodiments and comparative examples of the present invention, the reagent information used is as follows:

[0028] Antioxidant T501, 2,6-di-tert-butyl-p-cresol, Jinzhou Petrochemical Fine Chemical Co., Ltd.

[0029] Antioxidant T531, N-phenyl-α-naphthylamine, Danyang Tianyu Petroleum Additive Factory;

[0030] Metal passivator T551, N,N-dibutylaminomethylene-alkylbenzotriazole, Beijing Xingpu Fine Chemical Technology Development Co., Ltd.

[0031] Metal passivator T552, condensation product of benzotriazole, aldehyde and amine, Changsha Wangcheng Petrochemical Plant;

[0032] Rust inhibitor K1031, a complex of amino acid derivatives and amines, King Company, USA;

[0033] Rust inhibitor T746, dodecenylsuccinic acid, Wuxi Nanfang Petroleum Additives Co., Ltd.

[0034] Rust inhibitor RC4802, alkenyl succinic acid half ester derivative, Rhein Chemie, Germany;

[0035] Rust inhibitor RC4801, alkenyl succinic acid half ester derivative, Rhein Chemie, Germany;

[0036] Demulsifier LZ5957, polyether, Lubrizol Corporation, USA;

[0037] Demulsifier T1001, amine and epoxide condensate, Nanjing Mingliang Oil Additives Co., Ltd.

[0038] Antifoaming agent AMH2, polyacrylate, BASF, Germany;

[0039] API Group I paraffinic base oil, HVI Ib500;

[0040] In each embodiment and comparative example of the present invention, the information of each testing method is as follows:

[0041] Kinematic viscosity, GB / T 265 Petroleum products kinematic viscosity determination and dynamic viscosity calculation method, Cannon CAV2100 fully automatic kinematic viscometer.

[0042] Demulsification, GB / T 7305 Determination of water separation of petroleum and synthetic fluids, Shanghai Tanaka Scientific Instrument Co., Ltd. KR-2 Petroleum and synthetic fluid demulsification performance tester.

[0043] Liquid phase corrosion, GB / T 11143 Test method for rust prevention of mineral oil with inhibitor in the presence of water, RLP-6 Liquid Phase Corrosion Tester from Shanghai Xiaode Instrument Co., Ltd.

[0044] Rotating oxygen bomb test, SH / T 0193 Determination of oxidation stability of lubricating oils, rotating oxygen bomb method, Changsha Fulande Experimental Analytical Instrument Co., Ltd.

[0045] Example 1

[0046] This embodiment provides a mineral oil vacuum pump oil composition and a preparation method, the specific details of which are as follows:

[0047] The raw material components include:

[0048] Antioxidant: 0.2 parts T501 and 0.15 parts T531;

[0049] Metal passivator: 0.03 parts T552;

[0050] Rust inhibitor: 0.3 parts RC4801;

[0051] Demulsifier: 0.01 parts of LZ5957;

[0052] Antifoaming agent: 0.01 parts AMH2;

[0053] The balance is base oil up to 100 parts, and the base oil is API Class I paraffin base oil HVI Ib500.

[0054] Preparation method: After mixing the above antioxidant, metal passivator, rust inhibitor, demulsifier and antifoaming agent with base oil, heating to 57° C. and heating and stirring for 2.5 hours, filtering to obtain the mineral vacuum pump oil composition.

[0055] Example 2

[0056] This embodiment provides a mineral oil vacuum pump oil composition and a preparation method, the specific details of which are as follows:

[0057] The raw material components include:

[0058] Antioxidant: 0.2 parts T501 and 0.15 parts T531;

[0059] Metal passivator: 0.03 parts T552;

[0060] Rust inhibitor: 0.3 parts RC4801;

[0061] Demulsifier: 0.01 parts T1001;

[0062] Antifoaming agent: 0.01 parts AMH2;

[0063] The balance is base oil up to 100 parts, and the base oil is API Class I paraffin base oil HVI Ib500.

[0064] Preparation method: After mixing the above antioxidant, metal passivator, rust inhibitor, demulsifier and antifoaming agent with base oil, heating to 57° C. and heating and stirring for 2.5 hours, filtering to obtain the mineral vacuum pump oil composition.

[0065] Example 3

[0066] This embodiment provides a mineral oil vacuum pump oil composition and a preparation method, the specific details of which are as follows:

[0067] The raw material components include:

[0068] Antioxidant: 0.2 parts T501 and 0.15 parts T531;

[0069] Metal passivator: 0.03 parts T552;

[0070] Rust inhibitor: 0.3 parts T746;

[0071] Demulsifier: 0.01 parts T1001;

[0072] Antifoaming agent: 0.01 parts AMH2;

[0073] The balance is base oil up to 100 parts, and the base oil is API Class I paraffin base oil HVI Ib500.

[0074] Preparation method: After mixing the above antioxidant, metal passivator, rust inhibitor, demulsifier and antifoaming agent with base oil, heating to 57° C. and heating and stirring for 2.5 hours, filtering to obtain the mineral vacuum pump oil composition.

[0075] Comparative Example 1

[0076] This comparative example provides a mineral oil vacuum pump oil composition and a preparation method, the specific details of which are as follows:

[0077] The raw material components include:

[0078] Antioxidant: 0.2 parts T501 and 0.15 parts T531;

[0079] Metal passivator: 0.03 parts T551;

[0080] Rust inhibitor: 0.3 parts RC4801;

[0081] Demulsifier: 0.01 parts of LZ5957;

[0082] Antifoaming agent: 0.01 parts AMH2;

[0083] The balance is base oil up to 100 parts, and the base oil is API Class I paraffin base oil HVI Ib500.

[0084] Preparation method: After mixing the above antioxidant, metal passivator, rust inhibitor and antifoaming agent with base oil, heating to 57° C. and heating and stirring for 2.5 hours, filtering to obtain the mineral vacuum pump oil composition.

[0085] Comparative Example 2

[0086] This comparative example provides a mineral oil vacuum pump oil composition and a preparation method, the specific details of which are as follows:

[0087] The raw material components include:

[0088] Antioxidant: 0.2 parts T501 and 0.15 parts T531;

[0089] Metal passivator: 0.03 parts T552;

[0090] Rust inhibitor: 0.3 parts RC4802;

[0091] Demulsifier: 0.01 parts of LZ5957;

[0092] Antifoaming agent: 0.01 parts AMH2;

[0093] The balance is base oil up to 100 parts, and the base oil is API Class I paraffin base oil HVI Ib500.

[0094] Preparation method: After mixing the above antioxidant, metal passivator, demulsifier and antifoaming agent with base oil, heating to 57° C. and heating and stirring for 2.5 hours, filtering to obtain the mineral vacuum pump oil composition.

[0095] Comparative Example 3

[0096] This comparative example provides a mineral oil vacuum pump oil composition and a preparation method, the specific details of which are as follows:

[0097] The raw material components include:

[0098] Antioxidant: 0.2 parts T501 and 0.15 parts T531;

[0099] Metal passivator: 0.03 parts T552;

[0100] Rust inhibitor: 0.3 parts K1031;

[0101] Demulsifier: 0.01 parts of LZ5957;

[0102] Antifoaming agent: 0.01 parts AMH2;

[0103] The balance is base oil up to 100 parts, and the base oil is API Class I paraffin base oil HVI Ib500.

[0104] Preparation method: After mixing the above antioxidant, metal passivator, rust inhibitor and antifoaming agent with base oil, heating to 57° C. and heating and stirring for 2.5 hours, filtering to obtain the mineral vacuum pump oil composition.

[0105] Comparative Example 4

[0106] This comparative example provides a mineral oil vacuum pump oil composition and a preparation method, the specific details of which are as follows:

[0107] The raw material components include:

[0108] Antioxidant: 0.2 parts T501 and 0.15 parts T531;

[0109] Metal passivator: 0.03 parts T552;

[0110] Rust inhibitor: 0.3 parts T746;

[0111] Demulsifier: 0.01 parts of LZ5957;

[0112] Antifoaming agent: 0.01 parts AMH2;

[0113] The balance is base oil up to 100 parts, and the base oil is API Class I paraffin base oil HVI Ib500.

[0114] Preparation method: After mixing the above antioxidant, metal passivator, demulsifier and antifoaming agent with base oil, heating to 57° C. and heating and stirring for 2.5 hours, filtering to obtain the mineral vacuum pump oil composition.

[0115] Table 1 Various components and corresponding weight parts of mineral oil vacuum pump oil composition

[0116]

[0117]

[0118] The mineral vacuum pump oil compositions prepared in Examples 1-3 and Comparative Examples 1-4 were subjected to kinematic viscosity, demulsibility, liquid phase corrosion, and rotary oxygen bomb tests. The test results are shown in Table 2:

[0119] Table 2 Test results of the embodiments and comparative examples

[0120]

[0121] As can be seen from Table 2, the kinematic viscosities of the mineral vacuum pump oil compositions obtained in Examples 1-3 and Comparative Examples 1-4 are consistent. This is because the main component of the vacuum pump oil compositions is the same base oil, which accounts for about 99%.

[0122] Comparison of Comparative Example 1 with Example 1 shows that the metal passivator T552 is more conducive to improving the oxidation stability of the oil than T551; comparison of Comparative Examples 2 to 3 with Example 1 shows that the rust inhibitors RC4802 and K1031 have an adverse effect on the anti-emulsification performance of the oil, especially RC4802. This may be because both the rust inhibitor and the demulsifier are polar compounds, and the rust inhibitor has an inhibitory effect on the demulsifier; comparison of Comparative Example 4 with Example 3 shows that the rust inhibitor T746 and the demulsifier T1001 have good compatibility.

[0123] In summary, the mineral vacuum pump oil composition of the present invention, by adding a suitable ratio of demulsifier, rust inhibitor, etc., has good water separation ability during the use of the oil product, can effectively extend the oil change cycle, achieves good technical effects, and has excellent anti-emulsification ability and rust prevention performance.

[0124] It should be noted that the embodiments described above are only used to explain the present invention and do not constitute any limitation of the present invention. The present invention has been described with reference to typical embodiments, but it should be understood that the words used therein are descriptive and explanatory words, rather than restrictive words. The present invention may be modified as specified within the scope of the claims of the present invention, and the present invention may be revised without departing from the scope and spirit of the present invention. Although the present invention described therein relates to specific methods, materials and embodiments, it does not mean that the present invention is limited to the specific examples disclosed therein. On the contrary, the present invention can be extended to all other methods and applications with the same function.

Claims

1. Application of a mineral oil vacuum pump oil composition in the field of sealing or lubrication of a mechanical vacuum pump, characterized in that: The components of the mineral oil vacuum pump oil composition include, by weight: Antioxidant 0.3~0.5%; Metal passivator 0.01~0.1%; Rust inhibitor 0.02~0.1%; Demulsifier 0.01~0.05%; Antifoaming agent 0.005~0.02%; The balance is base oil, Wherein, the base oil is API Class I paraffin base oil, and the metal passivator is metal passivator T552; When the rust inhibitor is alkenyl succinic acid half ester derivative RC4801, the demulsifier is at least one of amine and epoxide condensate T1001 or polyether LZ5957; or when the rust inhibitor is dodecenyl succinic acid T746, the demulsifier is amine and epoxide condensate T1001.

2. The use according to claim 1, characterized in that The antioxidant includes at least one of 2,6-di-tert-butyl-p-cresol, alkylated diphenylamine, and phenyl-α-naphthylamine.

3. The use according to any one of claims 1-2, characterized in that The anti-foaming agent includes at least one of polysiloxane and polyacrylate.

4. The use according to any one of claims 1-2, characterized in that The preparation method of a mineral oil type vacuum pump oil composition comprises: mixing an antioxidant, a metal passivator, a rust inhibitor, a demulsifier and an antifoaming agent with a base oil, and filtering to obtain the mineral oil type vacuum pump oil composition.

5. The use according to claim 4, characterized in that The mixing method is heating and stirring; the heating and stirring temperature is 55° C. to 60° C., and the time is 1 to 2.5 hours.

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