Reciprocating air compressor lubricating oil composition

Abstract

This invention provides a reciprocating air compressor lubricating oil composition, comprising the following components by mass percentage: 0.1%-1% ionic liquid, 1%-5% antioxidant, 0.02%-1% metal passivator, 0.02%-1% rust inhibitor, 0.01%-0.5% extreme pressure anti-wear agent, 0.002%-0.02% demulsifier, 0.002%-0.02% antifoaming agent, with the balance being base oil. This reciprocating air compressor lubricating oil composition, comprising specific amounts of ionic liquid, antioxidant, metal passivator, rust inhibitor, extreme pressure anti-wear agent, demulsifier, antifoaming agent, and base oil, is beneficial for improving oxidation resistance, corrosion resistance, rust prevention, anti-wear properties, demulsification properties, and antifoaming properties, exhibiting superior comprehensive performance and broad application prospects.

Description

Technical Field

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

[0002] An air compressor is a general-purpose machine that increases gas pressure by compressing air, and it is a key piece of equipment in the industrial field. Reciprocating air compressors are highly efficient, with an adiabatic efficiency greater than 80%, a high pressure ratio, strong adaptability, convenient flow adjustment, and a wide range of applications. Currently, reciprocating air compressors account for approximately 20-30% of the market share. Reciprocating air compressors are characterized by high pressure and high temperature operating conditions, with exhaust temperatures reaching over 220℃. Furthermore, as reciprocating air compressors develop towards multi-stage and precision designs, the pressure and temperature of these compressors will increase, placing more stringent demands on the overall performance of the lubricating oil, especially in terms of oxidation resistance, corrosion resistance, rust prevention, wear resistance, demulsification, and anti-foaming properties.

[0003] While current reciprocating air compressor lubricants can improve various properties to some extent, the improvement is still limited, leaving room for further improvement, particularly in corrosion resistance and rust prevention. Therefore, there is an urgent need for a reciprocating air compressor lubricant composition that possesses superior oxidation resistance, corrosion resistance, rust prevention, wear resistance, demulsification resistance, and anti-foaming properties. Summary of the Invention

[0004] This invention provides a lubricating oil composition for reciprocating air compressors, which is beneficial for improving oxidation resistance, corrosion resistance, rust prevention, wear resistance, demulsification and anti-foaming properties.

[0005] The technical solution adopted in this invention is a reciprocating air compressor lubricating oil composition, which is composed of the following components by mass percentage: 0.1%-1% ionic liquid, 1%-5% antioxidant, 0.02%-1% metal passivator, 0.02%-1% rust inhibitor, 0.01%-0.5% extreme pressure anti-wear agent, 0.002%-0.02% demulsifier, 0.002%-0.02% antifoaming agent, with the balance being base oil.

[0006] A further feature of this invention is that the structure of the ionic liquid is as shown in formula (1):

[0007]

[0008] In equation (1), n ​​is a positive integer from 8 to 10.

[0009] Composed of the following components by weight percentage: ionic liquid 0.5%-0.8%, antioxidant 2%-4%, metal passivator 0.1%-0.5%, rust inhibitor 0.1%-0.5%, extreme pressure anti-wear agent 0.05%-0.2%, demulsifier 0.005%-0.01%, antifoaming agent 0.005%-0.01%, balance base oil.

[0010] The antioxidant is selected from 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, or tris(2,4-di-tert-butylphenyl) phosphite.

[0011] The metal passivating agent is selected from at least one of toluenetriazole, N,N'-dialkylaminomethylenetriazole, or N,N'-disalinetriamine.

[0012] The rust inhibitor is selected from at least one of dinonylnaphthalenesulfonate calcium, dodecenyl succinic acid, isononylphenoxyacetic acid, dodecenyl succinic acid half ester, dodecenyl succinic acid monoester or sorbitol monooleate.

[0013] The extreme pressure anti-wear agent is selected from at least one of butyl triphenyl thiophosphate, dialkyl dithiophosphate, or fatty phosphate amine salt.

[0014] The demulsifier is oil-soluble polyether DL32.

[0015] The antifoaming agent is No. 1 composite antifoaming agent.

[0016] The base oil is pentaerythritol ester.

[0017] The beneficial effects of this invention are:

[0018] This invention provides a lubricating oil composition for reciprocating air compressors, which is beneficial for improving oxidation resistance, corrosion resistance, rust prevention, wear resistance, demulsification and anti-foaming properties, and has excellent comprehensive performance and broad application prospects. Detailed Implementation

[0019] The reciprocating air compressor lubricating oil composition of the present invention comprises the following components by mass percentage: 0.1%-1% ionic liquid, 1%-5% antioxidant, 0.02%-1% metal passivator, 0.02%-1% rust inhibitor, 0.01%-0.5% extreme pressure anti-wear agent, 0.002%-0.02% demulsifier, 0.002%-0.02% antifoaming agent, with the balance being base oil. The reciprocating air compressor lubricating oil composition of the present invention is prepared by adding the above-mentioned raw materials and stirring thoroughly.

[0020] The structure of ionic liquids is shown in equation (1):

[0021]

[0022] In equation (1), n ​​is a positive integer from 8 to 10.

[0023] In a preferred embodiment, the composition comprises the following raw material components by weight percentage: 0.5%-0.8% ionic liquid, 2%-4% antioxidant, 0.1%-0.5% metal passivator, 0.1%-0.5% rust inhibitor, 0.05%-0.2% extreme pressure anti-wear agent, 0.005%-0.01% demulsifier, 0.005%-0.01% antifoaming agent, with the balance being base oil.

[0024] The antioxidant is selected from 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, or tris(2,4-di-tert-butylphenyl) phosphite.

[0025] The metal passivating agent is selected from at least one of toluenetriazole, N,N'-dialkylaminomethylenetriazole, or N,N'-disalinetriamine.

[0026] The rust inhibitor is selected from at least one of dinonylnaphthalenesulfonate calcium, dodecenyl succinic acid, isononylphenoxyacetic acid, dodecenyl succinic acid half ester, dodecenyl succinic acid monoester or sorbitol monooleate.

[0027] The extreme pressure anti-wear agent is selected from at least one of butyl triphenyl thiophosphate, dialkyl dithiophosphate, or fatty phosphate amine salt.

[0028] The demulsifier is oil-soluble polyether DL32.

[0029] The antifoaming agent is No. 1 composite antifoaming agent.

[0030] The base oil is pentaerythritol ester.

[0031] Example 1

[0032] The composition of the reciprocating air compressor lubricating oil composition in this embodiment is shown in Table 1, wherein the ionic liquid structure is as shown in formula (2):

[0033]

[0034] In equation (2), n = 8.

[0035] Table 1

[0036] name mass percentage content / % Ionic liquids 1 dioctyldiphenylamine 0.5 4,4'-Methylenebis(2,6-di-tert-butylphenol) 1 Toluene-triazole 0.05 Calcium dinonylnaphthalenesulfonate 0.05 Butyltriphenylthiophosphate 0.3 DL32 0.003 #1 Composite Antifoaming Agent 0.003 Pentaerythritol ester 97.094

[0037] Example 2

[0038] The composition of the reciprocating air compressor lubricating oil composition in this embodiment is shown in Table 2, wherein the ionic liquid structure is as shown in formula (3):

[0039]

[0040] In equation (3), n = 9.

[0041] Table 2

[0042]

[0043]

[0044] Example 3

[0045] The composition of the reciprocating air compressor lubricating oil composition in this embodiment is shown in Table 3, wherein the ionic liquid structure is as shown in formula (4):

[0046]

[0047] In equation (4), n = 10.

[0048] Table 3

[0049] name mass percentage content / % Ionic liquids 0.1 Octylphenyl-α-naphthylamine 3 Tris(2,4-di-tert-butylphenyl)phosphite 2 N,N'-Disalminepropanediamine 0.02 Isononylphenoxyacetic acid 1 Fatty acid phosphate amine salts 0.01 DL32 0.002 #1 Composite Antifoaming Agent 0.02 Pentaerythritol ester 93.848

[0050] Example 4

[0051] The composition of the reciprocating air compressor lubricating oil composition in this embodiment is shown in Table 4, wherein the ionic liquid structure is as shown in formula (5):

[0052]

[0053] In equation (5), n = 8.

[0054] Table 4

[0055] name mass percentage content / % Ionic liquids 1 Octylpentyl diphenylamine 0.5 4,4'-Methylenebis(2,6-di-tert-butylphenol) 0.5 Toluene-triazole 1 Dodecenyl succinate monoester 0.02 Butyltriphenylthiophosphate 0.5 DL32 0.02 #1 Compound Antifoaming Agent 0.002 Pentaerythritol ester 96.458

[0056] Example 5

[0057] The composition of the reciprocating air compressor lubricating oil composition in this embodiment is shown in Table 5, wherein the ionic liquid structure is as shown in formula (6):

[0058]

[0059] In equation (6), n = 8.

[0060] Table 5

[0061]

[0062]

[0063] Example 6

[0064] The composition of the reciprocating air compressor lubricating oil composition in this embodiment is shown in Table 6, wherein the ionic liquid structure is as shown in formula (7):

[0065]

[0066] In equation (7), n = 8.

[0067] Table 6

[0068]

[0069]

[0070] Example 7

[0071] The composition of the reciprocating air compressor lubricating oil composition in this embodiment is shown in Table 7, wherein the ionic liquid structure is as shown in formula (8):

[0072]

[0073] In equation (8), n = 9.

[0074] Table 7

[0075]

[0076] Example 8

[0077] The composition of the reciprocating air compressor lubricating oil composition in this embodiment is shown in Table 8, wherein the ionic liquid structure is as shown in formula (9):

[0078]

[0079] In equation (9), n = 10.

[0080] Table 8

[0081]

[0082] Example 9

[0083] The composition of the reciprocating air compressor lubricating oil composition in this embodiment is shown in Table 9, wherein the ionic liquid structure is as shown in formula (10):

[0084]

[0085] In equation (10), n = 10.

[0086] Table 9

[0087]

[0088] Example 10

[0089] The composition of the reciprocating air compressor lubricating oil composition in this embodiment is shown in Table 10, wherein the ionic liquid structure is as shown in formula (11):

[0090]

[0091] In equation (11), n ​​= 9.

[0092] Table 10

[0093] name mass percentage content / % Ionic liquids 1 Octylpentyl diphenylamine 1 N,N'-Dialkylaminomethylenetriazole 1 Calcium dinonylnaphthalenesulfonate 0.02 Fatty acid phosphate amine salts 0.5 DL32 0.02 #1 Compound Antifoaming Agent 0.002 Pentaerythritol ester 96.458

[0094] Comparative Example 1

[0095] The composition and mass content of existing lubricating oil compositions are shown in Table 11.

[0096] Table 11

[0097] name mass percentage content / % dioctyldiphenylamine 0.5 4,4'-Methylenebis(2,6-di-tert-butylphenol) 1 Toluene-triazole 0.05 Calcium dinonylnaphthalenesulfonate 0.05 Butyltriphenylthiophosphate 0.3 DL32 0.003 #1 Compound Antifoaming Agent 0.003 Pentaerythritol ester 98.094

[0098] Comparative Example 2

[0099] The composition and mass content of existing lubricating oil compositions are shown in Table 12. The ionic liquid structure in Table 12 is shown in formula (12):

[0100]

[0101] In equation (12), n = 9.

[0102] Table 12

[0103]

[0104] Comparative Example 3

[0105] The composition and mass content of existing lubricating oil compositions are shown in Table 13. The ionic liquid structure in Table 13 is shown in formula (13):

[0106]

[0107] In equation (13), n = 10.

[0108] Table 13

[0109] name mass percentage content / % Ionic liquids 1.5 Octylphenyl-α-naphthylamine 0.5 Tris(2,4-di-tert-butylphenyl)phosphite 0.3 N,N'-Disalminepropanediamine 1.1 Isononylphenoxyacetic acid 0.01 Fatty acid phosphate amine salts 0.6 DL32 0.001 #1 Composite Antifoaming Agent 0.001 Pentaerythritol ester 95.988

[0110] Comparative Example 4

[0111] The composition and mass content of existing lubricating oil compositions are shown in Table 14. The ionic liquid structure in Table 14 is shown in formula (14):

[0112]

[0113] In equation (14), n = 8.

[0114] Table 14

[0115]

[0116]

[0117] 1. The performance of the base oil pentaerythritol ester was tested, and the test results are shown in Table 15.

[0118] Table 15

[0119] project Pentaerythritol ester Test methods <![CDATA[Kinematic viscosity (40 °C) / (mm 2 / s)]]> 101.3 GB / T 265 Viscosity Index 92 GB / T 2541 Pour point / ℃ -27 GB / T 3535 Flash point (open cup) / °C 272 GB / T 3536

[0120] 2. The performance of the reciprocating air compressor lubricating oil compositions in the examples and comparative examples was tested, and the test results are shown in Table 16.

[0121] Table 16

[0122]

[0123]

[0124] As can be seen from Table 16, the reciprocating air compressor lubricating oil composition in the embodiments of the present invention has excellent antioxidant, anti-corrosion, rust prevention, anti-wear, demulsification and anti-foaming properties, especially excellent anti-corrosion and rust prevention properties.

Claims

1. A lubricating oil composition for a reciprocating air compressor, characterized in that, The product comprises, by weight percentage, the following components: 0.1%-1% ionic liquid, 1%-5% antioxidant, 0.02%-1% metal passivator, 0.02%-1% rust inhibitor, 0.01%-0.5% extreme pressure anti-wear agent, 0.002%-0.02% demulsifier, 0.002%-0.02% antifoaming agent, with the balance being base oil; the base oil is pentaerythritol ester. The structure of the ionic liquid is shown in formula (1): （1） In equation (1), n ​​is a positive integer from 8 to 10.

2. The reciprocating air compressor lubricating oil composition according to claim 1, characterized in that, Composed of the following components by weight percentage: ionic liquid 0.5%-0.8%, antioxidant 2%-4%, metal passivator 0.1%-0.5%, rust inhibitor 0.1%-0.5%, extreme pressure anti-wear agent 0.05%-0.2%, demulsifier 0.005%-0.01%, antifoaming agent 0.005%-0.01%, balance being base oil.

3. The reciprocating air compressor lubricating oil composition according to claim 1 or 2, characterized in that, The antioxidant is selected from 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, or tris(2,4-di-tert-butylphenyl) phosphite.

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

5. The reciprocating air compressor lubricating oil composition according to claim 1, characterized in that, The rust inhibitor is selected from at least one of dinonylnaphthalenesulfonate calcium, dodecenyl succinic acid, isononylphenoxyacetic acid, dodecenyl succinic acid half ester, dodecenyl succinic acid monoester, or sorbitol monooleate.

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

7. The reciprocating air compressor lubricating oil composition according to claim 1, characterized in that, The demulsifier is oil-soluble polyether DL32.

8. The reciprocating air compressor lubricating oil composition according to claim 1, characterized in that, The antifoaming agent is No. 1 composite antifoaming agent.

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