Rotary vane vacuum pump lubricating oil composition

Abstract

The application discloses a rotary vane vacuum pump lubricating oil composition, which is composed of the following components based on the total weight of the composition: ionic liquid 0.3-3%; antioxidant 0.3-3%; extreme pressure and wear resistant agent 0.01-1%; antirust agent 0.01-1%; metal passivator 0.01-1%; demulsifier 0.005-0.05%; antifoaming agent 0.005-0.05%; and the balance is base oil, the sum of the mass percentages of the above components is 100%; the structure of the ionic liquid is: wherein n is a positive integer of 9-11; the composition has excellent oxidation resistance, wear resistance, rust resistance, corrosion resistance, emulsion resistance and foam resistance, especially excellent rust resistance and corrosion resistance; the rotary vane vacuum pump lubricating oil has excellent comprehensive performance and wide application prospect.

Description

Technical Field

[0001] This invention belongs to the field of lubricating oil technology, and specifically relates to a lubricating oil composition for rotary vane vacuum pumps. Background Technology

[0002] Rotary vane vacuum pumps are one of the most basic vacuum-generating devices in vacuum technology. Their working principle involves an eccentrically mounted rotor inside the pump chamber, with its outer circumference tangent to the inner surface of the chamber. Two (or more) spring-loaded vanes are installed in the rotor slots. During rotation, centrifugal force and spring tension keep the vane tips in contact with the inner wall of the pump chamber. The rotor's rotation causes the vanes to slide along the inner wall, drawing out gas and creating a vacuum. Typically, lubricating oil is used to seal the gap between the vanes and the pump chamber; therefore, the performance of the lubricating oil directly affects the pump's performance. To broaden the application range and extend the service life of rotary vane vacuum pumps, certain requirements are placed on the lubricating oil's properties, including oxidation resistance, wear resistance, rust prevention, corrosion resistance, demulsification, and anti-foaming.

[0003] While current vacuum pump oils can improve the various properties of rotary vane vacuum pump lubricants to some extent (e.g., oxidation resistance, wear resistance, rust prevention, corrosion resistance, demulsification, and anti-foaming properties), the degree of improvement is still limited. This leaves room for further improvement in the properties of rotary vane vacuum pump lubricants, especially in terms of rust prevention and corrosion resistance. Summary of the Invention

[0004] The purpose of this invention is to provide a lubricating oil composition for rotary vane vacuum pumps, which has excellent rust and corrosion resistance.

[0005] The first technical solution adopted in this invention is a rotary vane vacuum pump lubricating oil composition, based on the total weight of the composition, consisting of the following components: 0.3-3% ionic liquid; 0.3-3% antioxidant; 0.01-1% extreme pressure anti-wear agent; 0.01-1% rust inhibitor; 0.01-1% metal passivator; 0.005-0.05% demulsifier; 0.005-0.05% antifoaming agent; the balance being base oil, and the sum of the mass percentages of the above components is 100%; the structure of the ionic liquid is as follows:

[0006]

[0007] Where n is a positive integer between 9 and 11.

[0008] The second technical solution adopted in this invention is a rotary vane vacuum pump lubricating oil composition, based on the total weight of the composition, consisting of the following components: 0.5-1% ionic liquid; 0.5-2% antioxidant; 0.2-0.5% extreme pressure anti-wear agent; 0.1-0.3% rust inhibitor; 0.1-0.3% metal passivator; 0.02-0.04% demulsifier; 0.01-0.02% antifoaming agent; the balance being base oil, and the sum of the mass percentages of the above components is 100%.

[0009] The structure of ionic liquids is as follows:

[0010]

[0011] Where n is a positive integer between 9 and 11.

[0012] The invention is further characterized by:

[0013] The antioxidant is composed of one or more of the following components in any proportion: octylpentyl diphenylamine, dinonyl diphenylamine, nonylbutyl diphenylamine, 2,6-di-tert-butyl-p-cresol, 4,4'-methylene bis(2,6-di-tert-butylphenol), and tris(2,4-di-tert-butylphenyl) phosphite.

[0014] Extreme pressure anti-wear agents are composed of one or two components of dialkyl dithiophosphate and fatty phosphate amine salts mixed in any ratio.

[0015] The rust inhibitor is composed of one or more of the following components in any proportion: dodecenyl succinate half ester, dodecenyl succinate monoester, and dinonylnaphthalene sulfonate calcium.

[0016] The metal passivating agent is composed of one or more of toluenetriazole and N,N'-dialkylaminomethylenetriazole in any ratio.

[0017] The demulsifier is oil-soluble polyether DL32.

[0018] The antifoaming agent is composed of one or more components of composite antifoaming agent T921 (1#) and composite antifoaming agent T922 (2#) mixed in any ratio.

[0019] Base oils are composed of one or more components from Group II and Group III base oils mixed in any proportion.

[0020] The mass ratio of ionic liquid to antioxidant is 1:1-2.

[0021] The beneficial effects of this invention are:

[0022] The present invention relates to a rotary vane vacuum pump lubricating oil composition, which has excellent antioxidant, anti-wear, rust prevention, corrosion prevention, demulsification and anti-foaming properties, especially excellent rust prevention and corrosion prevention. The rotary vane vacuum pump lubricating oil of the present invention has excellent comprehensive performance and broad application prospects. Detailed Implementation

[0023] The present invention will now be described in detail with reference to specific embodiments.

[0024] The rotary vane vacuum pump lubricating oil composition of this invention, based on the total weight of the composition, consists of the following components: 0.3-3% ionic liquid; 0.3-3% antioxidant; 0.01-1% extreme pressure anti-wear agent; 0.01-1% rust inhibitor; 0.01-1% metal passivator; 0.005-0.05% demulsifier; 0.005-0.05% antifoaming agent; the balance being base oil, and the sum of the mass percentages of the above components is 100%; the structure of the ionic liquid is as follows:

[0025]

[0026] Where n is a positive integer between 9 and 11.

[0027] The rotary vane vacuum pump lubricating oil composition of the present invention comprises, based on the total weight of the composition, the following components: 0.5-1% ionic liquid; 0.5-2% antioxidant; 0.2-0.5% extreme pressure anti-wear agent; 0.1-0.3% rust inhibitor; 0.1-0.3% metal passivator; 0.02-0.04% demulsifier; 0.01-0.02% antifoaming agent; the balance being base oil, and the sum of the mass percentages of the above components is 100%.

[0028] The structure of ionic liquids is as follows:

[0029]

[0030] Where n is a positive integer between 9 and 11.

[0031] The composition of this invention uses an ionic liquid containing azo ethyl sulfate. As can be seen from the molecular structure, the azo structure of the ionic liquid has a strong systemic effect, which can form a protective film on the surface of metals such as copper, reduce the corrosion rate of the metal, effectively protect the metal surface, and play a role in rust prevention and corrosion resistance.

[0032] The antioxidant is composed of one or more of the following components in any proportion: octylpentyl diphenylamine, dinonyl diphenylamine, nonylbutyl diphenylamine, 2,6-di-tert-butyl-p-cresol, 4,4'-methylene bis(2,6-di-tert-butylphenol), and tris(2,4-di-tert-butylphenyl) phosphite.

[0033] Extreme pressure anti-wear agents are composed of one or two components of dialkyl dithiophosphate and fatty phosphate amine salts mixed in any ratio.

[0034] The rust inhibitor is composed of one or more of the following components in any proportion: dodecenyl succinate half ester, dodecenyl succinate monoester, and dinonylnaphthalene sulfonate calcium.

[0035] The metal passivating agent is composed of one or more of toluenetriazole and N,N'-dialkylaminomethylenetriazole in any ratio.

[0036] The demulsifier is oil-soluble polyether DL32.

[0037] The antifoaming agent is composed of one or more components of composite antifoaming agent T921 (1#) and composite antifoaming agent T922 (2#) mixed in any ratio.

[0038] Base oils are composed of one or more components from Group II and Group III base oils mixed in any proportion.

[0039] Example 1

[0040] The composition of the rotary vane vacuum pump lubricating oil composition of the present invention is shown in Table 1.

[0041] The structure of ionic liquids is as follows:

[0042]

[0043] Where n = 9.

[0044] Table 1

[0045] name mass percentage content / % Ionic liquids 0.3 Nonylbutyl diphenylamine 0.5 2,6-Di-tert-butyl-p-cresol 1 Dialkyl dithiophosphate 0.1 Dodecenyl succinate half-ester 0.05 Toluene-triazole 0.05 DL32 0.01 T921 0.005 HVIH 12 97.985

[0046] Example 2

[0047] The composition of the rotary vane vacuum pump lubricating oil composition of the present invention is shown in Table 2. The ionic liquid comprises the structure of Formula 1:

[0048]

[0049] Where n = 10.

[0050] Table 2

[0051]

[0052] Example 3

[0053] The composition of the rotary vane vacuum pump lubricating oil composition of the present invention is shown in Table 3.

[0054] The structure of ionic liquids is as follows:

[0055]

[0056] Where n = 11.

[0057] Table 3

[0058] name mass percentage content / % Ionic liquids 1 dinonyldiphenylamine 1 2,6-Di-tert-butyl-p-cresol 1 Dialkyl dithiophosphate 0.2 Calcium dinonylnaphthalenesulfonate 0.1 N,N'-Dialkylaminomethylenetriazole 0.1 DL32 0.02 T921 0.01 HVIH 12 96.57

[0059] Example 4

[0060] The composition of the rotary vane vacuum pump lubricating oil composition of the present invention is shown in Table 4.

[0061] The structure of ionic liquids is as follows:

[0062]

[0063] n = 9.

[0064] Table 4

[0065]

[0066]

[0067] Example 5

[0068] The composition of the rotary vane vacuum pump lubricating oil composition of the present invention is shown in Table 5.

[0069] The structure of ionic liquids is as follows:

[0070]

[0071] Where n = 11.

[0072] Table 5

[0073]

[0074] Additionally, the following comparison scale is set:

[0075] Comparative Example 1

[0076] The composition of the comparative rotary vane vacuum pump lubricating oil composition is shown in Table 6.

[0077] Table 6

[0078]

[0079]

[0080] Comparative Example 2

[0081] The composition of the comparative rotary vane vacuum pump lubricating oil composition is shown in Table 7.

[0082] The structure of ionic liquids is as follows:

[0083]

[0084] Where n = 16.

[0085] Table 7

[0086]

[0087] Comparative Example 3

[0088] The composition of the rotary vane vacuum pump lubricating oil composition in this comparative example is shown in Table 8.

[0089] The structure of ionic liquids is as follows:

[0090]

[0091] Where n = 11.

[0092] Table 8

[0093] name mass percentage content / % Ionic liquids 0.2 dinonyldiphenylamine 2 2,6-Di-tert-butyl-p-cresol 2 Dialkyl dithiophosphate 1.2 Calcium dinonylnaphthalenesulfonate 0.007 N,N'-Dialkylaminomethylenetriazole 0.007 DL32 0.003 T922 0.003 HVIH 12 94.58

[0094] Comparative Example 4

[0095] The composition of the rotary vane vacuum pump lubricating oil composition in this comparative example is shown in Table 9.

[0096] The structure of ionic liquids is as follows:

[0097]

[0098] Where n = 9.

[0099] Table 9

[0100]

[0101]

[0102] The performance characteristics are as follows:

[0103] 1. Performance tests were conducted on the base oil HVIH 12, and the test results are shown in Table 10.

[0104] Table 10

[0105] project HVIH 12 Test methods <![CDATA[Kinematic viscosity (40 °C) / (mm 2 / s)]]> 105.8 GB / T265 Viscosity Index 103 GB / T2541 Pour point / ℃ -15 GB / T3535 Flash point (open cup) / °C 272 GB / T3536 Acid value (mgKOH / g) 0.006 GB / T 4945

[0106] 2. The performance of the rotary vane vacuum pump lubricating oil compositions in Examples 1-5 and Comparative Examples 1-4 was tested, and the test results are shown in Table 11.

[0107] Table 11

[0108]

[0109]

[0110] As can be seen from Table 11, the rotary vane vacuum pump lubricating oil composition prepared in the embodiments of the present invention has excellent anti-oxidation, anti-wear, anti-rust, anti-corrosion, anti-emulsification and anti-foaming properties, especially excellent anti-rust and anti-corrosion properties.

Claims

1. A lubricating oil composition for a rotary vane vacuum pump, characterized in that, Based on the total weight of the composition, it consists of the following components: ionic liquid 0.5-1%; antioxidant 0.5-2%; extreme pressure anti-wear agent 0.2-0.5%; rust inhibitor 0.1-0.3%; metal passivator 0.1-0.3%; demulsifier 0.02-0.04%; antifoaming agent 0.01-0.02%; the balance being base oil, and the sum of the mass percentages of the above components is 100%. The structure of the ionic liquid is as follows: Where n is a positive integer from 9 to 11; The antioxidant is composed of one or more of the following components in any ratio: octylpentyl diphenylamine, dinonyl diphenylamine, nonylbutyl diphenylamine, 2,6-di-tert-butyl-p-cresol, 4,4'-methylene bis(2,6-di-tert-butylphenol), and tris(2,4-di-tert-butylphenyl) phosphite; the mass ratio of the ionic liquid to the antioxidant is 1:1-2; and the demulsifier is oil-soluble polyether DL32.

2. The rotary vane vacuum pump lubricating oil composition according to claim 1, characterized in that, The extreme pressure anti-wear agent is composed of one or two components selected from dialkyl dithiophosphate and fatty phosphate amine salts, mixed in any ratio.

3. The rotary vane vacuum pump lubricating oil composition according to claim 1, characterized in that, The rust inhibitor is composed of one or more components selected from dodecenyl succinate half ester, dodecenyl succinate monoester, and dinonylnaphthalene sulfonate calcium mixed in any proportion.

4. The rotary vane vacuum pump lubricating oil composition according to claim 1, characterized in that, The metal passivating agent is composed of one or more components selected from toluenetriazole and N,N'-dialkylaminomethylenetriazole in any ratio.

5. The rotary vane vacuum pump lubricating oil composition according to claim 1, characterized in that, The antifoaming agent is composed of one or more components of composite antifoaming agent T921 (1#) and composite antifoaming agent T922 (2#) mixed in any ratio.

6. The rotary vane vacuum pump lubricating oil composition according to claim 1, characterized in that, The base oil is composed of one or more components of Group II and Group III base oils mixed in any proportion.

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