Reciprocating air compressor oil additive composition and preparation method thereof

Abstract

The invention discloses an oil additive composition for a reciprocating air compressor. The oil additive composition comprises the following components in percentage by mass: 0.1-1% of double-ionic liquid; 0.2-2% of an antioxidant; 0.1-1% of an anti-wear agent; 0.01%-0.1% of a dispersing agent; 0.005 to 0.03 percent of an anti-foaming agent; and the balance of base oil. The sum of the mass percentages of the components is 100%. The reciprocating air compressor oil additive composition can be obtained by uniformly mixing the raw materials according to the composition. The reciprocating air compressor oil additive composition is blended into compressor oil, meets the requirements of national standard GB / T 12691-2021 Air Compressor Oil, not only has excellent anti-rust property, oxidation resistance, wear resistance and other properties, and is low in evaporation loss and not easy to generate carbon residue, but also is simple in preparation process, easy to operate and wide in application range.

Description

Technical Field

[0001] The invention belongs to the technical field of lubricating oil additive preparation, and in particular relates to a reciprocating air compressor oil additive composition, and also relates to a preparation method of the composition. Background Art

[0002] Reciprocating air compressors are being upgraded and developed in the direction of miniaturization, lightness, and precision. The exhaust pressure and temperature of the equipment are further improved, and the requirements for the rust resistance, oxidation resistance, and wear resistance of the compressor oil will become more stringent. General mineral oil and ordinary synthetic products are difficult to meet the use requirements.

[0003] Ionic liquids are non-volatile, non-flammable, highly conductive, have high heat capacity, low vapor pressure, and stable properties, and are widely used in various fields of chemical research. Due to the variability of anions and cations, ionic liquids are endowed with multiple functions, and are less used in the field of lubricating oils, especially in air compressor oils. A Chinese patent (application number: 202010631007.9, publication number: CN113881479B) discloses a screw air compressor oil and an additive composition thereof, which uses thiazole phosphate ionic liquids to passivate metal activity and inhibit the catalytic oxidation of metals and their compounds on oil products. When compounded with antioxidants such as aromatic amines and bisphenols, it can greatly enhance the antioxidant properties of oil products and extend the life of oil products. At present, there are no reports on diionic liquids and multifunctional ionic liquids with anti-wear, anti-oxidation, and anti-rust properties in the field of lubricating oils. Summary of the invention

[0004] The object of the present invention is to provide a reciprocating air compressor oil additive composition, which has excellent rust resistance, oxidation resistance and wear resistance.

[0005] The technical solution adopted by the present invention is that the reciprocating air compressor oil additive composition comprises the following components by mass percentage: 0.1-1% of diionic liquid; 0.2-2% of antioxidant; 0.1-1% of antiwear agent; 0.01-0.1% of dispersant; 0.005-0.03% of antifoaming agent; the balance is base oil; the sum of the mass percentages of the above components is 100%.

[0006] The present invention is also characterized in that:

[0007] The structure of diionic liquid is as follows:

[0008]

[0009] The antioxidants are aromatic amine antioxidants and bisphenol antioxidants, and the mass ratio of the aromatic amine antioxidants to the bisphenol antioxidants is 1:1.

[0010] The aromatic amine antioxidant is alkyl diphenylamine or phenyl-α-naphthylamine; the bisphenol antioxidant is 4,4'-methylenebis(2,6-di-tert-butylphenol).

[0011] The anti-wear agent is triphenyl thiophosphate or butyl triphenyl thiophosphate.

[0012] The dispersant is polyisobutylene succinimide.

[0013] The antifoaming agent is 1# composite antifoaming agent T921 or methyl silicone oil ester T903.

[0014] The base oil is polyol ester.

[0015] The beneficial effects of the present invention are as follows: the present invention adopts a double ionic liquid compound system, and the obtained reciprocating air compressor lubricating oil has excellent rust resistance, oxidation resistance, wear resistance and other properties, and has low evaporation loss and is not easy to produce carbon residue, and is suitable for lubrication of high-pressure reciprocating air compressor equipment. DETAILED DESCRIPTION

[0016] The present invention is described in detail below in conjunction with specific implementation modes.

[0017] The reciprocating air compressor oil additive composition of the present invention comprises the following components by mass percentage: 0.1-1% of diionic liquid; 0.2-2% of antioxidant; 0.1-1% of antiwear agent; 0.01-0.1% of dispersant; 0.005-0.03% of antifoaming agent; the balance is base oil; the sum of the mass percentages of the above components is 100%;

[0018] The structure of diionic liquid is as follows:

[0019]

[0020] The diionic liquid is a composite system of imidazolium cations and carboxylic acid anions, which can improve the protection of lubricants to metals, extend the service life of oil products, increase the rust resistance, oxidation resistance and wear resistance of lubricants, and the C12-18 alkyl chain increases the solubility, ensuring that it can be dissolved in lubricants at high and low temperature conditions. It can exhibit excellent compatibility when combined with other components.

[0021] The addition amount of the diionic liquid is 0.1-1%. If it is less than 0.1%, it is difficult to protect the metal surface of the compressor; if it is greater than 1%, it will cause the sealing rubber of the compressor to fail and increase the cost.

[0022] The antioxidants are aromatic amine antioxidants and bisphenol antioxidants, and the mass ratio of aromatic amine antioxidants to bisphenol antioxidants is 1:1. The aromatic amine antioxidant is alkyl diphenylamine or phenyl-α-naphthylamine, and the purity is greater than 99%. The better purity can ensure that the additive composition has better antioxidant properties and avoid the by-products causing the blended guide rail oil to have a darker appearance color; the bisphenol antioxidant is 4,4'-methylenebis (2,6-di-tert-butylphenol), and the volatility and thermal stability of the bisphenol antioxidant are higher, and the antioxidant effect will be better in high-temperature conditions of the compressor oil. The amount of antioxidant added is 0.2-2%. If it is less than 0.2%, the oil life is short and it is difficult to play a protective role; if it is greater than 2%, it will cause more compressor sludge.

[0023] The anti-wear agent is triphenyl thiophosphate or butyl triphenyl thiophosphate. It has extreme pressure anti-wear properties, anti-oxidation properties, thermal stability, etc., and can play an excellent lubricating role. The amount of anti-wear agent added is 0.01-0.1%. If it is less than 0.01%, the anti-wear effect is poor, resulting in lubrication failure; if it is greater than 0.1%, it is easy to cause rust prevention failure and increase costs.

[0024] The dispersant is polyisobutylene succinimide. The dispersant can better dissolve and disperse the sludge produced during the high-temperature oxidation process, and at the same time reduce the particle size of the coated sludge, so that the sludge is reasonably distributed, the large particles go out after passing through the filter, and the small particles are suspended in the oil, and there will be no valve jamming phenomenon. The amount of dispersant added is 0.01-0.1%. If it is less than 0.01%, the effect of dissolving the sludge is poor; if it is greater than 0.1%, the water separation of the lubricating oil will drop significantly, and it is easy to appear opaque when encountering moisture in the air.

[0025] The antifoaming agent is 1# composite antifoaming agent T921 or methyl silicone oil ester T903, which overcomes the shortcomings of low solubility, poor air release and poor stability of silicone oil, and has excellent foam inhibition and solubility. The amount of antifoaming agent added is 0.005-0.03%. If it is lower than 0.005%, the oil is easily contaminated by the outside world during use, resulting in rapid increase of foam and weakened lubrication effect; if it is higher than 0.03%, the oil will appear turbid.

[0026] The base oil is polyol ester; during the lubrication process, the ability to form a thick oil film between the friction pairs is critical to the lubrication effect. The polar groups containing ester groups are more easily adsorbed on the friction interface to form an effective tough oil film.

[0027] The reciprocating air compressor oil additive composition of the present invention can be obtained by uniformly mixing the raw materials according to the above composition. The reciprocating air compressor oil additive composition of the present invention not only has relatively excellent rust resistance, oxidation resistance, wear resistance and other properties, low evaporation loss, and is not easy to produce carbon residue, but also has a simple preparation process, is easy to operate, and has a wide range of applications.

[0028] Example 1

[0029] The composition of the reciprocating air compressor oil additive composition of this embodiment is shown in Table 1.

[0030] Table 1 Composition of reciprocating air compressor oil additive composition

[0031] name Mass percentage / % Diionic Liquids 0.2 Alkyl diphenylamine 1 4,4'-Methylenebis(2,6-di-tert-butylphenol) 1 Triphenyl phosphorothioate 0.1 Polyisobutylene succinimide 0.1 T921 0.005 Polyol Esters 97.595

[0032] Example 2

[0033] The composition of the reciprocating air compressor oil additive composition of this embodiment is shown in Table 2.

[0034] Table 2 Composition of reciprocating air compressor oil additive composition

[0035] name Mass percentage / % Diionic Liquids 1 Phenyl-α-naphthylamine 0.1 4,4'-Methylenebis(2,6-di-tert-butylphenol) 0.1 Butyl triphenyl phosphorothioate 1 Polyisobutylene succinimide 0.01 T903 0.03 Polyol Esters 97.76

[0036] Example 3

[0037] The composition of the reciprocating air compressor oil additive composition of this embodiment is shown in Table 3.

[0038] Table 3 Composition of reciprocating air compressor oil additive composition

[0039] name Mass percentage / % Diionic Liquids 0.5 Alkyl diphenylamine 1 4,4'-Methylenebis(2,6-di-tert-butylphenol) 0.5 Butyl triphenyl phosphorothioate 0.3 Polyisobutylene succinimide 0.05 T921 0.01 Polyol Esters 97.64

[0040] Comparative Example 1

[0041] The composition of the reciprocating air compressor oil additive composition of this comparative example is shown in Table 4.

[0042] Table 4 Composition of reciprocating air compressor oil additive composition

[0043] name Mass percentage / % Alkyl diphenylamine 1 4,4'-Methylenebis(2,6-di-tert-butylphenol) 1 Triphenyl phosphorothioate 0.1 Polyisobutylene succinimide 0.1 T921 0.005 Polyol Esters 97.795

[0044] Comparative Example 2

[0045] The composition of the reciprocating air compressor oil additive composition of this comparative example is shown in Table 5.

[0046] Table 5 Composition of reciprocating air compressor oil additive composition

[0047]

[0048]

[0049] The reciprocating air compressor oil additive composition in the embodiment and the comparative example was subjected to performance tests. The test results are shown in Table 6.

[0050] Table 6 Performance test results of reciprocating air compressor oil additive composition

[0051]

[0052] As can be seen from Table 6, the reciprocating air compressor oil additive composition prepared in the embodiment of the present invention has relatively excellent rust resistance, oxidation resistance, wear resistance and other properties, and has low evaporation loss and is not easy to produce carbon residue. The reciprocating air compressor oil additive composition prepared in Comparative Examples 1 and 2 without adding diionic liquids has unqualified liquid phase corrosion, a rotating oxygen bomb of less than 1000min, a FZG failure level of less than 10, a large increase in viscosity in the oxidation corrosion test, discoloration of copper and magnesium metals, and significantly worse rust resistance, oxidation resistance, wear resistance and other properties than the reciprocating air compressor oil additive composition prepared in the embodiment.

Claims

1. A reciprocating air compressor oil additive composition, characterized in that: The invention comprises the following components by mass percentage: 0.1-1% of diionic liquid; 0.2-2% of antioxidant; 0.1-1% of antiwear agent; 0.01-0.1% of dispersant; 0.005-0.03% of antifoam agent; and the balance is base oil; the sum of the mass percentages of the above components is 100%.

2. The reciprocating air compressor oil additive composition according to claim 1, characterized in that: The structure of the diionic liquid is as follows: n＝12-18。 3. The reciprocating air compressor oil additive composition according to claim 1, characterized in that: The antioxidants are aromatic amine antioxidants and bisphenol antioxidants, and the mass ratio of the aromatic amine antioxidant to the bisphenol antioxidant is 1:

1.

4. The reciprocating air compressor oil additive composition according to claim 3, characterized in that: The aromatic amine antioxidant is alkyl diphenylamine or phenyl-α-naphthylamine; the bisphenol antioxidant is 4,4'-methylenebis(2,6-di-tert-butylphenol).

5. The reciprocating air compressor oil additive composition according to claim 1, characterized in that: The anti-wear agent is triphenyl thiophosphate or butyl triphenyl thiophosphate.

6. The reciprocating air compressor oil additive composition according to claim 1, characterized in that: The dispersant is polyisobutylene succinimide.

7. The reciprocating air compressor oil additive composition according to claim 1, characterized in that: The antifoaming agent is 1# composite antifoaming agent T921 or methyl silicone oil ester T903.

8. The reciprocating air compressor oil additive composition according to claim 1, characterized in that: The base oil is polyol ester.

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