A screw vacuum pump lubricating oil composition

Abstract

The application provides a screw vacuum pump lubricating oil composition, which comprises the following raw materials in mass percentage: 0.8-3% of ionic liquid; 0.4-2% of antioxidant; 0.3-2% of extreme pressure and antiwear agent; 0.05-0.5% of antirust agent; 0.05-0.5% of metal deactivator; 0.003-0.03% of demulsifier; 0.003-0.03% of antifoaming agent; and the balance of base oil. The screw vacuum pump lubricating oil composition of the application has good rust prevention and corrosion resistance by adding ionic liquid with a specific chemical structure, and also has good oxidation resistance, wear resistance, emulsion resistance and foam resistance, and has excellent comprehensive performance, and has a wide application prospect.

Description

Technical Field

[0001] This invention relates to the field of lubricating oil technology, and in particular to a lubricating oil composition for a screw vacuum pump. Background Technology

[0002] A screw vacuum pump is a pumping device that uses a pair of screws to rotate synchronously at high speed in opposite directions in the pump casing to generate suction and exhaust. Screw vacuum pumps are an upgraded product of oil-sealed vacuum pumps, with advantages such as long service life, low energy consumption, and no pollution. They are often used to pump gases containing large amounts of water vapor and dust, and are widely used in fields with high requirements for clean vacuum, such as electronics, semiconductors, and pharmaceuticals.

[0003] Water vapor and dust are significant factors accelerating the oxidation, aging, emulsification, and deterioration of screw vacuum pump lubricating oil, leading to wear, corrosion, and other damage to the equipment. Therefore, the performance of screw vacuum pump lubricating oil directly affects the operation of the screw vacuum pump. To broaden the application range and extend the service life of screw vacuum pumps, certain requirements are placed on the anti-oxidation, anti-wear, rust prevention, corrosion prevention, demulsification, and anti-foaming properties of screw vacuum pump lubricating oil.

[0004] While existing technologies can improve the aforementioned properties of screw vacuum pump lubricating oils to some extent, the degree of improvement remains limited, especially in terms of rust and corrosion resistance. Therefore, there is an urgent need to provide a screw vacuum pump lubricating oil composition that combines superior oxidation resistance, wear resistance, rust prevention, corrosion resistance, demulsification, and foaming properties. Summary of the Invention

[0005] To address the aforementioned technical problems, the present invention aims to provide a screw vacuum pump lubricating oil composition that, by adding an ionic liquid, possesses both excellent rust prevention and corrosion resistance.

[0006] To achieve the above objectives, the present invention provides a screw vacuum pump lubricating oil composition comprising the following raw materials in weight percentages:

[0007]

[0008]

[0009] The balance is base oil;

[0010] The ionic liquid is selected from compounds having the general formula shown in Formula I.

[0011]

[0012] Where n is 11, 12 or 13.

[0013] Preferably, in the above-mentioned screw vacuum pump lubricating oil composition, the screw vacuum pump lubricating oil composition comprises the following raw materials in the indicated mass percentages:

[0014]

[0015] The balance is base oil.

[0016] In the above-mentioned screw vacuum pump lubricating oil composition, preferably, the mass ratio of the ionic liquid to the antioxidant is (0.4-0.6):1.

[0017] In the above-mentioned screw vacuum pump lubricating oil composition, preferably, the antioxidant is selected from at least one of 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.

[0018] In the above-mentioned screw vacuum pump lubricating oil composition, preferably, the extreme pressure anti-wear agent is selected from dialkyl dithiophosphate and / or fatty phosphate amine salts.

[0019] In the above-mentioned screw vacuum pump lubricating oil composition, preferably, the rust inhibitor is selected from at least one of dodecenyl succinate half ester, dodecenyl succinate monoester, and dinonylnaphthalene sulfonate calcium.

[0020] In the above-mentioned screw vacuum pump lubricating oil composition, preferably, the metal passivating agent is selected from toluenetriazole and / or N,N'-dialkylaminomethylenetriazole.

[0021] In the above-mentioned screw vacuum pump lubricating oil composition, preferably, the demulsifier is DL32 demulsifier. DL32 demulsifier is an oil-soluble polyether.

[0022] In the above-mentioned screw vacuum pump lubricating oil composition, preferably, the antifoaming agent is selected from No. 1 composite antifoaming agent T921 and / or No. 2 composite antifoaming agent T922.

[0023] Preferably, in the above-mentioned screw vacuum pump lubricating oil composition, the base oil is polyalphaolefin (PAO).

[0024] The technical solution provided by this invention has the following beneficial effects:

[0025] The screw vacuum pump lubricating oil composition provided by this invention improves the rust and corrosion resistance of the lubricating oil composition by adding ionic liquids with specific chemical structures. At the same time, it also has good oxidation resistance, wear resistance, demulsification resistance and foaming resistance, with excellent comprehensive performance and broad application prospects. Detailed Implementation

[0026] In order to provide a clearer understanding of the technical features, objectives and beneficial effects of the present invention, the technical solution of the present invention will now be described in detail below, but it should not be construed as limiting the scope of implementation of the present invention.

[0027] The ionic liquids used in the embodiments of this invention are selected from compounds having the general formula shown in Formula I.

[0028]

[0029] In the formula, n is 11, 12 or 13.

[0030] The present invention will now be described in detail with reference to specific embodiments.

[0031] Example 1

[0032] This embodiment provides a screw vacuum pump lubricating oil composition, which comprises the following components by mass percentage:

[0033] Ionic liquid (n=11 in general formula) 1%; Octylpentyl diphenylamine 0.8%; 2,6-di-tert-butyl-p-cresol 0.8%; Dialkyl dithiophosphate 0.3%; Dodecenyl succinate monoester 0.05%; Toluenetriazole 0.05%; DL32 demulsifier 0.003%; No. 1 composite antifoaming agent T921 0.003%; PAO 10 96.994%.

[0034] Example 2

[0035] This embodiment provides a screw vacuum pump lubricating oil composition, which comprises the following components by mass percentage:

[0036] Ionic liquid (n=12 in general formula) 1.5%; dinonyldiphenylamine 0.5%; 4,4'-methylenebis(2,6-di-tert-butylphenol) 0.5%; fatty acid phosphate amine salt 1%; calcium dinonylnaphthalenesulfonate 0.3%; N,N'-dialkylaminomethylenetriazole 0.3%; DL32 demulsifier 0.01%; No. 2 composite antifoaming agent T922 0.01%; PAO 10 95.88%.

[0037] Example 3

[0038] This embodiment provides a screw vacuum pump lubricating oil composition, which comprises the following components by mass percentage:

[0039] Ionic liquid (n=13 in general formula) 2%; nonylbutyldiphenylamine 0.5%; 4,4'-methylenebis(2,6-di-tert-butylphenol) 0.3%; tris(2,4-di-tert-butylphenyl) phosphite 0.2%; dialkyl dithiophosphate 1%; dodecenyl succinate half ester 0.3%; toluenetriazole 0.3%; DL32 demulsifier 0.01%; No. 1 composite antifoaming agent T921 0.01%; PAO10 95.38%.

[0040] Example 4

[0041] This embodiment provides a screw vacuum pump lubricating oil composition, which comprises the following components by mass percentage:

[0042] Ionic liquid (n=11 in general formula) 0.8%; Octylpentyl diphenylamine 1%; 4,4'-methylenebis(2,6-di-tert-butylphenol) 1%; Dialkyl dithiophosphate 0.3%; Dinonylnaphthalenesulfonate calcium 0.5%; Toluenetriazole 0.05%; DL32 demulsifier 0.03%; No. 2 composite antifoaming agent T922 0.003%; PAO 10 96.317%.

[0043] Example 5

[0044] This embodiment provides a screw vacuum pump lubricating oil composition, which comprises the following components by mass percentage:

[0045] Ionic liquid (n = 13 in general formula) 3%; nonylbutyldiphenylamine 0.2%; 2,6-di-tert-butyl-p-cresol 0.1%;

[0046] Tris(2,4-di-tert-butylphenyl) phosphite 0.1%; dialkyl dithiophosphate 2%; dodecenyl succinate half ester 0.05%; N,N'-dialkylaminomethylenetriazole 0.5%; DL32 demulsifier 0.003%; No. 1 composite antifoaming agent T921 0.03%; PAO 1094.017%.

[0047] Comparative Example 1

[0048] This comparative example provides a screw vacuum pump lubricating oil composition with the same components as in Example 1, except that the screw vacuum pump lubricating oil composition of this comparative example does not contain ionic liquid, and the difference is made up by base oil.

[0049] The specific components of the screw vacuum pump lubricating oil composition in this comparative example are as follows:

[0050] Octylpentyl diphenylamine 0.8%; 2,6-di-tert-butyl-p-cresol 0.8%; dialkyl dithiophosphate 0.3%; dodecenyl succinate monoester 0.05%; toluene-triazole 0.05%; DL32 demulsifier 0.003%; No. 1 composite antifoaming agent T921 0.003%; PAO 10 97.994%.

[0051] Comparative Example 2

[0052] This comparative example provides a screw vacuum pump lubricating oil composition with the same components as in Example 2, except that n is 2 in the ionic liquid formula of the screw vacuum pump lubricating oil composition of this comparative example.

[0053] Comparative Example 3

[0054] This comparative example provides a screw vacuum pump lubricating oil composition comprising the following components by mass percentage:

[0055] Ionic liquid (n=13 in general formula) 3.5%; nonylbutyldiphenylamine 0.1%; 4,4'-methylenebis(2,6-di-tert-butylphenol) 0.1%; tris(2,4-di-tert-butylphenyl) phosphite 0.1%; dialkyl dithiophosphate 0.2%; dodecenyl succinate half ester 0.03%; toluene-triazole 0.03%; DL32 demulsifier 0.04%; No. 1 composite antifoaming agent T921 0.04%; PAO 10 95.86%.

[0056] Comparative Example 4

[0057] This comparative example provides a screw vacuum pump lubricating oil composition comprising the following components by mass percentage:

[0058] Ionic liquid (n=11 in general formula) 0.6%; Octylpentyl diphenylamine 1%; 4,4'-methylenebis(2,6-di-tert-butylphenol) 1.5%; Dialkyl dithiophosphate 2.2%; Dinonylnaphthalenesulfonate calcium 0.6%; Toluenetriazole 0.6%; DL32 demulsifier 0.002%; T922 0.002%; PAO 10 93.496%.

[0059] Experimental Example

[0060] This experimental example tests the performance of the screw vacuum pump lubricating oil compositions of the above embodiments and comparative examples.

[0061] The viscosity, flash point, acid value, etc. of the screw vacuum pump lubricating oil compositions of the above embodiments and comparative examples were tested, with base oil PAO 10 as a blank control. The test results are shown in Table 1.

[0062] Table 1. Test results of viscosity, flash point, and acid value of the lubricating oil composition for screw vacuum pumps.

[0063]

[0064]

[0065] The corrosion resistance and rust prevention properties of the lubricating oil composition for screw vacuum pumps were tested using the methods specified in GB / T 5096 and GB / T 11143, respectively. The test results are shown in Table 2.

[0066] Table 2. Test results of corrosion resistance and rust prevention of the lubricating oil composition for screw vacuum pumps.

[0067] project Copper sheet corrosion (3h / 100℃) / grade Liquid phase corrosion, method A Example 1 1b qualified Example 2 1a qualified Example 3 1a qualified Example 4 1b qualified Example 5 1b qualified Comparative Example 1 2c Unqualified Comparative Example 2 2b Unqualified Comparative Example 3 2a Unqualified Comparative Example 4 2a Unqualified Test methods GB / T 5096 GB / T 11143

[0068] As shown in Table 2, the screw vacuum pump lubricating oil composition of the present invention exhibits good corrosion resistance and rust prevention. Comparative Example 1 showed the worst corrosion resistance, indicating that the ionic liquid of the present invention can significantly improve the corrosion resistance of the lubricating oil composition. Comparative Example 2, due to the short carbon chain in its ionic liquid structure, did not achieve satisfactory corrosion resistance and rust prevention. Comparative Examples 3 and 4, due to excessively high or low amounts of ionic liquid, still failed to achieve the technical effects of the present invention.

[0069] The demulsibility and antifoaming properties of the screw vacuum pump lubricating oil composition were tested using the methods specified in GB / T 7305 (time for the emulsion layer to reach 3 mL) and GB / T 12579, respectively. The test results are shown in Table 3. Table 3 shows that the screw vacuum pump lubricating oil composition of the present invention exhibits good demulsibility and antifoaming properties.

[0070] Table 3. Results of Demulsification and Antifoaming Tests for Screw Vacuum Pump Lubricating Oil Compositions

[0071]

[0072] The oxidation resistance of the screw vacuum pump lubricating oil composition was tested using the methods specified in GB / T 12581 and SH / T 0193, and the test results are shown in Table 4. Table 4 shows that the screw vacuum pump lubricating oil composition of the present invention exhibits good oxidation resistance.

[0073] Table 4. Results of Oxidation Resistance Tests for Screw Vacuum Pump Lubricating Oil Compositions

[0074]

[0075] The lubricity and load-carrying capacity of the screw vacuum pump lubricating oil composition were tested using the methods specified in SH / T 0189 and NB / SH / T 0306, respectively, and the test results are shown in Table 5. As can be seen from Table 5, the screw vacuum pump lubricating oil composition of the present invention exhibits good lubricity and load-carrying capacity.

[0076] Table 5. Test results of lubrication and load-carrying capacity of screw vacuum pump lubricating oil composition.

[0077]

[0078] In summary, the screw vacuum pump lubricating oil composition prepared in the embodiments of the present invention has good antioxidant, anti-wear, rust prevention, corrosion prevention, demulsification and anti-foaming properties, and especially has excellent rust prevention and corrosion prevention properties.

Claims

1. A screw vacuum pump lubricating oil composition, the screw vacuum pump lubricating oil composition comprising the following raw materials in weight percentages: Ionic liquids 0.8-3%; Antioxidant 0.4-2%; Extreme pressure anti-wear agent 0.3-2%; Rust inhibitor 0.05-0.5%; Metal passivating agent 0.05-0.5%; Demulsifier 0.003-0.03%; Antifoaming agent 0.003-0.03%; The balance is base oil, which is a polyalphaolefin; in, The ionic liquid is selected from compounds having the general formula shown in Formula I. Formula I In the formula, n is 11, 12 or 13.

2. The screw vacuum pump lubricating oil composition according to claim 1, wherein, The screw vacuum pump lubricating oil composition comprises the following raw materials in the following mass percentages: Ionic liquids: 1.5-2.5%; Antioxidant 0.8-1.2%; Extreme pressure anti-wear agent 0.6-1%; Rust inhibitor 0.1-0.3%; Metal passivating agent 0.1-0.3%; Demulsifier 0.005-0.015%; Antifoaming agent 0.005-0.015%; The balance is base oil.

3. The screw vacuum pump lubricating oil composition according to claim 1 or 2, wherein, The mass ratio of the ionic liquid to the antioxidant is (0.4-0.6):

1.

4. The screw vacuum pump lubricating oil composition according to claim 1 or 2, wherein, The antioxidant is selected from at least one of 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.

5. The screw vacuum pump lubricating oil composition according to claim 1 or 2, wherein, The extreme pressure anti-wear agent is selected from dialkyl dithiophosphate and / or fatty phosphate amine salts.

6. The screw vacuum pump lubricating oil composition according to claim 1 or 2, wherein, The rust inhibitor is selected from at least one of dodecenyl succinate half ester, dodecenyl succinate monoester, and dinonylnaphthalene sulfonate calcium.

7. The screw vacuum pump lubricating oil composition according to claim 1 or 2, wherein, The metal passivating agent is selected from toluenetriazole and / or N,N'-dialkylaminomethylenetriazole.

8. The screw vacuum pump lubricating oil composition according to claim 1 or 2, wherein, The demulsifier is DL32 demulsifier.

9. The screw vacuum pump lubricating oil composition according to claim 1 or 2, wherein, The antifoaming agent is selected from No. 1 composite antifoaming agent T921 and / or No. 2 composite antifoaming agent T922.

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