A rotary air compressor lubricating oil composition

Abstract

This invention discloses a rotary air compressor lubricating oil composition, comprising the following components by mass percentage: 0.5-3% ionic liquid; 0.05-2% rust inhibitor; 0.05-2% metal passivator; 0.5-3% antioxidant; 0.02-0.5% extreme pressure anti-wear agent; 0.01-0.06% demulsifier; 0.005-0.03% antifoaming agent; with the balance being base oil. This rotary air compressor lubricating oil composition exhibits superior rust prevention, corrosion resistance, oxidation resistance, wear resistance, demulsification, and antifoaming properties. When used in the rotor, shaft seal, gears, and bearings of a rotary air compressor, this composition provides excellent lubrication, extends the service life of the rotary air compressor, and broadens its application range.

Description

Technical Field

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

[0002] Rotary air compressors are small in size, lightweight, compact in structure, have few parts, are easy to maintain, and offer good cooling, high efficiency, and stable gas delivery. Therefore, they are widely used in the compressor equipment field, especially in industries such as food, pharmaceuticals, textiles, and mining, where their market share is showing a significant upward trend. To further improve the working efficiency of rotary air compressors, reduce maintenance costs, and expand their application range, in recent years, rotary air compressors have been rapidly developing towards simplification, compactness, and lightweighting. At the same time, the conditions for equipment pressure, temperature, stage pressure ratio, and discharge volume are constantly increasing, making the operating conditions more demanding. Correspondingly, the requirements for the service life, rust prevention, corrosion resistance, oxidation resistance, and wear resistance of rotary air compressor lubricating oil are also becoming increasingly stringent.

[0003] While current rotary air compressor lubricants can improve various properties (e.g., rust prevention, corrosion resistance, oxidation resistance, wear resistance, demulsification, and anti-foaming) to some extent, the degree of improvement remains limited. This leaves room for further improvement, particularly in rust prevention and corrosion resistance. Therefore, there is an urgent need for a rotary air compressor lubricant composition that offers superior rust prevention, corrosion resistance, oxidation resistance, wear resistance, demulsification, and anti-foaming properties. Summary of the Invention

[0004] The purpose of this invention is to provide a rotary air compressor lubricating oil composition that has excellent rust prevention, corrosion resistance, oxidation resistance, wear resistance, demulsification resistance and foaming resistance, and can meet the lubrication requirements of rotary air compressors under harsh operating conditions.

[0005] The technical solution adopted in this invention is a rotary air compressor lubricating oil composition, comprising the following components by mass percentage: 0.5-3% ionic liquid; 0.05-2% rust inhibitor; 0.05-2% metal passivator; 0.5-3% antioxidant; 0.02-0.5% extreme pressure anti-wear agent; 0.01-0.06% demulsifier; 0.005-0.03% antifoaming agent; with the balance being base oil.

[0006] The invention is further characterized in that,

[0007] The composition comprises the following components by mass percentage: 1-2% ionic liquid; 0.2-1% rust inhibitor; 0.2-1% metal passivator; 1-2% antioxidant; 0.1-0.3% extreme pressure anti-wear agent; 0.02-0.04% demulsifier; 0.01-0.02% antifoaming agent; and the balance is base oil.

[0008] The structure of ionic liquids is as follows:

[0009]

[0010] Where n is a positive integer between 5 and 7.

[0011] The rust inhibitor is at least one of the following: calcium dinonylnaphthalenesulfonate, dodecenyl succinic acid, isononylphenoxyacetic acid, dodecenyl succinic acid half ester, dodecenyl succinic acid monoester, and sorbitol monooleate.

[0012] The metal passivating agent is at least one of toluenetriazole, N,N'-dialkylaminomethylenetriazole, and N,N'-disalinetriamine.

[0013] The antioxidant is at least one of dioctyl diphenylamine, dinonyl diphenylamine, styryl octyl diphenylamine, octyl butyl diphenylamine, octyl pentyl diphenylamine, nonyl butyl diphenylamine, octylphenyl-α-naphthylamine, 4,4'-methylene bis(2,6-di-tert-butylphenol), alkyl ester of (3-methyl-5-tert-butyl-4-hydroxyphenyl)propionate, and tris(2,4-di-tert-butylphenyl)phosphite.

[0014] The extreme pressure anti-wear agent is at least one of butyl triphenyl thiophosphate, dialkyl dithiophosphate, and fatty phosphate amine salt.

[0015] The demulsifier is oil-soluble polyether DL32; the antifoaming agent is at least one of composite antifoaming agent T921 (1#) and composite antifoaming agent T922 (2#); the base oil is pentaerythritol ester.

[0016] The mass ratio of ionic liquid to rust inhibitor is 1:0.3-0.6.

[0017] The beneficial effects of this invention are as follows: The main component of the rotary air compressor lubricating oil composition of this invention is an ionic liquid, which not only has good solubility but also exhibits excellent compatibility when combined with other components. Furthermore, this rotary air compressor lubricating oil composition possesses superior rust prevention (qualified by liquid phase corrosion method B), corrosion resistance (corrosion grade of copper sheet is 1b or higher at 100℃ for 3 hours, with good oxidative corrosion performance), oxidation resistance (high rotational oxygen bomb resistance), wear resistance (failure grade of FZG gearbox is 10 or higher), demulsification (oil-water separation time is less than or equal to 10 minutes), and anti-foaming properties (foam tendency / foam stability is less than or equal to 10 / 0 mL / mL), especially exhibiting superior rust prevention and corrosion resistance. When used in the rotor, shaft seal, gears, and bearings of a rotary air compressor, this rotary air compressor lubricating oil composition provides excellent lubrication, extends the service life of the rotary air compressor, and broadens its application range. Detailed Implementation

[0018] The present invention will now be described in detail with reference to specific embodiments.

[0019] This invention discloses a rotary air compressor lubricating oil composition, comprising the following components by mass percentage: 0.5-3% ionic liquid; 0.05-2% rust inhibitor; 0.05-2% metal passivator; 0.5-3% antioxidant; 0.02-0.5% extreme pressure anti-wear agent; 0.01-0.06% demulsifier; 0.005-0.03% antifoaming agent; the balance being base oil.

[0020] Furthermore, the composition comprises the following components by mass percentage: 1-2% ionic liquid; 0.2-1% rust inhibitor; 0.2-1% metal passivator; 1-2% antioxidant; 0.1-0.3% extreme pressure anti-wear agent; 0.02-0.04% demulsifier; 0.01-0.02% antifoaming agent; and the balance being base oil.

[0021] The mass ratio of ionic liquid to rust inhibitor is 1:0.3-0.6;

[0022] The structure of ionic liquids is as follows:

[0023]

[0024] Where n is a positive integer between 5 and 7;

[0025] In this invention, the raw materials for rust inhibitors, metal passivators, antioxidants, extreme pressure anti-wear agents, demulsifiers, antifoaming agents, and base oils can be further selected in order to further improve the compatibility of each raw material and improve the overall performance of the rotary air compressor lubricating oil composition.

[0026] The rust inhibitor is at least one of the following: calcium dinonylnaphthalenesulfonate, dodecenyl succinic acid, isononylphenoxyacetic acid, dodecenyl succinic acid half ester, dodecenyl succinic acid monoester, and sorbitol monooleate.

[0027] The metal passivating agent is at least one of toluenetriazole, N,N'-dialkylaminomethylenetriazole, and N,N'-disalinetriamine.

[0028] The antioxidant is at least one of dioctyl diphenylamine, dinonyl diphenylamine, styryl octyl diphenylamine, octyl butyl diphenylamine, octyl pentyl diphenylamine, nonyl butyl diphenylamine, octylphenyl-α-naphthylamine, 4,4'-methylene bis(2,6-di-tert-butylphenol), alkyl ester of (3-methyl-5-tert-butyl-4-hydroxyphenyl)propionate, and tris(2,4-di-tert-butylphenyl)phosphite.

[0029] The extreme pressure anti-wear agent is at least one of butyl triphenyl thiophosphate, dialkyl dithiophosphate, and fatty phosphate amine salt.

[0030] The demulsifier is oil-soluble polyether DL32.

[0031] The antifoaming agent is at least one of composite antifoaming agent T921 (1#) and composite antifoaming agent T922 (2#).

[0032] The base oil is pentaerythritol ester.

[0033] The rotary air compressor lubricating oil composition of the present invention can be obtained by uniformly mixing the raw materials according to the above composition. There are no particular limitations on the order of addition of the raw materials, the stirring rate, or the mixing temperature.

[0034] The rotary air compressor lubricating oil composition of the present invention not only has excellent comprehensive properties (rust prevention, corrosion resistance, oxidation resistance, wear resistance, demulsification and foaming resistance), but also has a simple preparation process, is easy to operate, and has a wide range of applications.

[0035] The composition of this invention uses an ionic liquid containing azo di(trifluoromethanesulfonyl)imide. As can be seen from the molecular structure, the azo and imide structures of the ionic liquid have 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.

[0036] Example 1

[0037] The composition of the rotary air compressor lubricating oil composition in this embodiment is shown in Table 1, wherein the structure of the ionic liquid is as follows:

[0038]

[0039] Where n = 5

[0040] Table 1. Composition of Lubricating Oil Components for Rotary Air Compressors

[0041] name mass percentage content / % Ionic liquids 0.5 Calcium dinonylnaphthalenesulfonate 2 Toluene-triazole 0.1 dioctyldiphenylamine 1.5 4,4'-Methylenebis(2,6-di-tert-butylphenol) 1 Butyltriphenylthiophosphate 0.5 DL32 0.01 T921 0.005 Pentaerythritol ester 94.385

[0042] Example 2

[0043] The composition of the rotary air compressor lubricating oil composition in this embodiment is shown in Table 2, wherein the structure of the ionic liquid is as follows:

[0044]

[0045] Where n = 6

[0046] Table 2 Composition of Lubricating Oil for Rotary Air Compressors

[0047] name mass percentage content / % Ionic liquids 1 Dodecenyl succinate monoester 1 N,N'-Dialkylaminomethylenetriazole 0.2 Octylpentyl diphenylamine 1 Alkyl (3-methyl-5-tert-butyl-4-hydroxyphenyl)propionate 1 Dialkyl dithiophosphate 0.1 DL32 0.03 T922 0.01 Pentaerythritol ester 95.66

[0048] Example 3

[0049] The composition of the rotary air compressor lubricating oil composition in this embodiment is shown in Table 3, wherein the structure of the ionic liquid is as follows:

[0050]

[0051] Where n = 7;

[0052] Table 3 Composition of Lubricating Oil for Rotary Air Compressors

[0053] name mass percentage content / % Ionic liquids 1.6 Dodecenyl succinate half-ester 0.8 N,N'-Disalminepropanediamine 0.5 Styrene-Octyldiphenylamine 0.6 4,4'-Methylenebis(2,6-di-tert-butylphenol) 0.6 Tris(2,4-di-tert-butylphenyl)phosphite 0.3 Fatty acid phosphate amine salts 0.2 DL32 0.02 T921 0.02 Pentaerythritol ester 95.37

[0054] Example 4

[0055] The composition of the rotary air compressor lubricating oil composition in this embodiment is shown in Table 4, wherein the structure of the ionic liquid is as follows:

[0056]

[0057] Where n = 5;

[0058] Table 4 Composition of Lubricating Oil for Rotary Air Compressors

[0059] name mass percentage content / % Ionic liquids 3 Isononylphenoxyacetic acid 0.05 Toluene-triazole 0.05 Octylphenyl-α-naphthylamine 0.2 4,4'-Methylenebis(2,6-di-tert-butylphenol) 0.3 Fatty acid phosphate amine salts 0.5 DL32 0.06 T921 0.005 Pentaerythritol ester 95.835

[0060] Example 5

[0061] The composition of the rotary air compressor lubricating oil composition in this embodiment is shown in Table 5; wherein, the structure of the ionic liquid is:

[0062]

[0063] Where n = 6;

[0064] Table 5 Composition of Lubricating Oil for Rotary Air Compressors

[0065] name mass percentage content / % Ionic liquids 0.5 Sorbitol monooleate 2 N,N'-Disalminepropanediamine 2 dinonyldiphenylamine 3 Dialkyl dithiophosphate 0.02 DL32 0.01 T922 0.03 Pentaerythritol ester 92.44

[0066] Comparative Example 1

[0067] The composition of the rotary air compressor lubricating oil composition of this comparative example is shown in Table 6;

[0068] Table 6 Composition of Lubricating Oil Composition for Rotary Air Compressors

[0069]

[0070]

[0071] Comparative Example 2

[0072] The composition of the rotary air compressor lubricating oil composition in this comparative example is shown in Table 7, wherein the structure of the ionic liquid is as follows:

[0073]

[0074] Where n = 2;

[0075] Table 7 Composition of Lubricating Oil for Rotary Air Compressors

[0076]

[0077]

[0078] Comparative Example 3

[0079] The composition of the rotary air compressor lubricating oil composition in this comparative example is shown in Table 8, wherein the structure of the ionic liquid is as follows:

[0080]

[0081] Where n = 7;

[0082] Table 8 Composition of Lubricating Oil for Rotary Air Compressors

[0083]

[0084]

[0085] Comparative Example 4

[0086] The composition of the rotary air compressor lubricating oil composition in this comparative example is shown in Table 9. The structure of the ionic liquid is as follows:

[0087]

[0088] Where n = 5;

[0089] Table 9 Composition of Lubricating Oil for Rotary Air Compressors

[0090] name mass percentage content / % Ionic liquids 3.2 Isononylphenoxyacetic acid 0.03 Toluene-triazole 0.03 Octylphenyl-α-naphthylamine 0.2 4,4'-Methylenebis(2,6-di-tert-butylphenol) 0.2 Butyltriphenylthiophosphate 0.6 DL32 0.08 T921 0.004 Pentaerythritol ester 95.656

[0091] Performance Characterization

[0092] 1. The performance of pentaerythritol ester base oil was tested, and the test results are shown in Table 10;

[0093] Table 10. Performance Test Results of Pentaerythritol Ester

[0094] project Pentaerythritol ester Test methods <![CDATA[Kinematic viscosity (40 °C) / (mm 2 / s)]]> 45.87 GB / T 265 Viscosity Index 106 GB / T 2541 Pour point / ℃ -45 GB / T 3535 Flash point (open cup) / °C 278 GB / T 3536 Acid value (mgKOH / g) 0.01 GB / T 4945

[0095] 2. The performance of the rotary air compressor lubricating oil compositions in the examples and comparative examples was tested, and the test results are shown in Table 11.

[0096] Table 11 Performance Test Results of Lubricating Oil Compositions for Rotary Air Compressors

[0097]

[0098]

[0099] As can be seen from Table 11, the rotary air compressor lubricating oil composition prepared in the embodiments of the present invention has excellent rust prevention, corrosion resistance, oxidation resistance, wear resistance, demulsification and anti-foaming properties, especially excellent rust prevention and corrosion resistance.

[0100] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A rotary air compressor lubricating oil composition, characterized in that, The composition comprises, by weight percentage, the following components: 0.5-3% ionic liquid; 0.05-2% rust inhibitor; 0.05-2% metal passivator; 0.5-3% antioxidant; 0.02-0.5% extreme pressure anti-wear agent; 0.01-0.06% demulsifier; 0.005-0.03% antifoaming agent; the balance being base oil. The structure of the ionic liquid is as follows: Where n is a positive integer between 5 and 7; The mass ratio of the ionic liquid to the rust inhibitor is 1:0.3-0.

6.

2. The rotary air compressor lubricating oil composition according to claim 1, characterized in that, The composition comprises the following components by mass percentage: 1-2% ionic liquid; 0.2-1% rust inhibitor; 0.2-1% metal passivator; 1-2% antioxidant; 0.1-0.3% extreme pressure anti-wear agent; 0.02-0.04% demulsifier; 0.01-0.02% antifoaming agent; and the balance being base oil.

3. A rotary air compressor lubricating oil composition according to claim 1 or 2, characterized in that, The rust inhibitor is at least one of the following: calcium dinonylnaphthalenesulfonate, dodecenyl succinic acid, isononylphenoxyacetic acid, dodecenyl succinic acid half ester, dodecenyl succinic acid monoester, and sorbitol monooleate.

4. A rotary air compressor lubricating oil composition according to claim 1 or 2, characterized in that, The metal passivating agent is at least one of toluenetriazole, N,N'-dialkylaminomethylenetriazole, and N,N'-disalinetriamine.

5. A rotary air compressor lubricating oil composition according to claim 1 or 2, characterized in that, The antioxidant is at least one of dioctyl diphenylamine, dinonyl diphenylamine, styryloctyl diphenylamine, octyl butyl diphenylamine, octyl pentyl diphenylamine, nonyl butyl diphenylamine, octylphenyl-α-naphthylamine, 4,4'-methylene bis(2,6-di-tert-butylphenol), alkyl (3-methyl-5-tert-butyl-4-hydroxyphenyl)propionate, and tris(2,4-di-tert-butylphenyl) phosphite.

6. A rotary air compressor lubricating oil composition according to claim 1 or 2, characterized in that, The extreme pressure anti-wear agent is at least one of butyl triphenyl thiophosphate, dialkyl dithiophosphate, and fatty phosphate amine salt.

7. A rotary air compressor lubricating oil composition according to claim 1 or 2, characterized in that, The demulsifier is oil-soluble polyether DL32; the antifoaming agent is at least one of composite antifoaming agent T921 (1#) and composite antifoaming agent T922 (2#); the base oil is pentaerythritol ester.

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