Rotary air compressor oil additive composition as well as preparation method and application thereof

Abstract

The invention discloses a rotary air compressor oil additive composition which comprises the following components in percentage by mass: 20%-60% of an antioxidant, 10%-30% of double ionic liquid, 6%-12% of an antirust agent, 6%-12% of a metal deactivator, 1%-5% of a demulsifying agent, 1%-5% of an anti-foaming agent and the balance of a diluent, and the sum of the mass percentages of the components is 100%. The invention further discloses application of the rotary air compressor oil additive composition in rotary air compressor lubricating oil. According to the invention, a dual-ionic liquid compounding system is adopted, and the obtained composition is used for rotary air compressor lubricating oil, shows excellent anti-rust property, corrosion resistance and oxidation resistance, can provide good anti-corrosion protection for metals, and meets the requirements of national standard GB / T 12691-2021 Air Compressor Oil. The composition disclosed by the invention is stable in performance and meets the lubricating requirements of various rotary air compressor systems.

Description

Technical Field

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

[0002] The rotary air compressor is the most widely used structural type of compressor equipment and is a key equipment in the industrial field. Compressor oil is an essential medium in compressor equipment and has lubrication, sealing and other functions in the system. The additive composition is the core of air compressor oil. Domestic products can be improved in terms of anti-rust, anti-corrosion, high-temperature oxidation and paint film production.

[0003] A Chinese patent (application number: 201810056082.X, publication number: CN108329978A) discloses a polyether screw air compressor oil composition, which uses water-insoluble polyether and ester base oils, as well as functional additives such as antioxidants, oiliness agents, rust inhibitors, detergents, demulsifiers, and defoamers. The oil has good lubrication properties, low-temperature aerodynamic properties, high-temperature oxidation stability, and low tendency to sludge and carbon deposition.

[0004] Chinese patent (application number: 201110456625.5, publication number: CN103184090A) discloses a rotary air compressor oil additive composition, which is composed of a high-temperature antioxidant composed of an amine antioxidant, a phenolic antioxidant and a phosphite antioxidant, an extreme pressure anti-wear agent, an anti-corrosion agent and a rust inhibitor, etc., and is suitable for rotary compressor oils based on hydrogenated oil, semi-synthetic oil and PAO oil, and can significantly improve the antioxidant properties of oil products and control the tendency of oil sludge. Although the above technology has certain effects in specific aspects, it still needs to be further improved in terms of rust resistance, corrosion resistance and antioxidant properties. Summary of the invention

[0005] The object of the present invention is to provide a rotary air compressor oil additive composition having excellent rust resistance, corrosion resistance and oxidation resistance.

[0006] The technical solution adopted by the present invention is that the rotary air compressor oil additive composition comprises the following components by mass percentage: antioxidant 20%-60%, diionic liquid 10%-30%, rust inhibitor 6%-12%, metal passivator 6%-12%, anti-emulsifier 1%-5%, anti-foaming agent 1%-5%, and the balance is diluent, and the sum of the mass percentages of the above components is 100%.

[0007] The present invention is also characterized in that:

[0008] The antioxidant is at least one of an aromatic amine antioxidant, a bisphenol antioxidant and a phenolamine antioxidant.

[0009] The aromatic amine antioxidant is alkyl diphenylamine or phenyl-α-naphthylamine; the bisphenol antioxidant is 4,4'-methylenebis(2,6-di-tert-butylphenol); and the phenolamine antioxidant is 2,6-di-tert-butyl α-dimethylamino-p-cresol.

[0010] The rust inhibitor is at least one of lithium dinonylnaphthalenesulfonate, nitrogen borate ester, and alkenyl succinic acid half ester; and the metal passivator is at least one of tolyltriazole derivatives and thiadiazole derivatives.

[0011] The anti-emulsifier is oil-soluble polyether DL32 or LZ5957; the anti-foaming agent is T901 or T902; and the diluent is PCL150SN.

[0012] Diionic liquids have the following structure:

[0013]

[0014] The beneficial effects of the present invention are as follows: the present invention adopts a double ionic liquid compound system, and the obtained composition is used for rotary air compressor lubricating oil, exhibits excellent rust resistance, corrosion resistance and oxidation resistance, and can provide good corrosion protection for metals. The composition of the present invention has stable performance and meets the lubrication requirements of various rotary air compressor systems. DETAILED DESCRIPTION

[0015] The present invention is described in detail below in conjunction with specific implementation modes.

[0016] The rotary air compressor oil additive composition of the present invention comprises the following components by mass percentage: 20%-60% antioxidant, 10%-30% diionic liquid, 6%-12% rust inhibitor, 6%-12% metal passivator, 1%-5% anti-emulsifier, 1%-5% anti-foaming agent, and the balance is diluent, and the sum of the mass percentages of the above components is 100%;

[0017] The antioxidant is at least one of an aromatic amine antioxidant, a bisphenol antioxidant and a phenolamine antioxidant.

[0018] The aromatic amine antioxidant is alkyl diphenylamine or phenyl-α-naphthylamine; the bisphenol antioxidant is 4,4'-methylenebis(2,6-di-tert-butylphenol); the phenolamine antioxidant is 2,6-di-tert-butyl α-dimethylamino-p-cresol;

[0019] The rust inhibitor is at least one of lithium dinonylnaphthalene sulfonate, nitrogen borate ester, and alkenyl succinic acid half ester.

[0020] The metal deactivator is at least one of a tolyltriazole derivative and a thiadiazole derivative.

[0021] The anti-emulsifier is oil-soluble polyether DL32 or LZ5957; the anti-foaming agent is T901 or T902; and the diluent is PCL150SN.

[0022] The diionic liquid has the following structure:

[0023]

[0024] From the molecular structure of the diionic liquid, it can be seen that 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, corrosion resistance and oxidation resistance of lubricants, and the C12-18 alkyl chain increases the solubility, ensuring that it can be dissolved in oil products under high and low temperature conditions, and can exhibit excellent compatibility when combined with other components.

[0025] In the composition of the present invention, the antioxidant and the diionic liquid work synergistically to improve the antioxidant performance of the oil and extend the life of the oil; the rust inhibitor forms an adsorption film on the metal surface to inhibit the contact of the metal with water and oxygen and reduce rust. The metal passivator can form a chemical protective film on the metal surface to prevent the metal from forming metal ions and catalyzing the oxidation of the oil, while preventing corrosion by sulfur and organic acids.

[0026] The antioxidant of the present invention is oil-soluble polyether DL32 or LZ5957. Rotary air compressor oil is in direct contact with air and will be contaminated by water during long-term use, forming emulsions, resulting in reduced lubricity of the oil, shortened service life and even mechanical damage. Demulsifiers can improve the demulsification of oil by changing the oil-water interfacial tension.

[0027] The antifoaming agent of the present invention is T901 or T902. The antifoaming agent can take into account antifoaming property, oil solubility, stability, etc., is easy to use and has good compatibility with other additives. The diluent is PCL150SN. The diluent has a relatively suitable viscosity and does not affect the physical and chemical indicators such as the flash point of the oil.

[0028] The rotary air compressor oil additive composition of the present invention is used for rotary air compressor lubricating oil, exhibits excellent rust resistance, corrosion resistance and oxidation resistance, and can provide good corrosion protection for metals. The composition has stable performance and is conducive to the long-term operation of the oil product.

[0029] The preparation method of the composition of the present invention is to uniformly mix the various substances. When the composition of the present invention is used in the lubricating oil of a rotary air compressor, the addition amount is 0.1-10% of the mass of the lubricating oil.

[0030] Example 1

[0031] The composition of the rotary air compressor oil additive composition of this embodiment is shown in Table 1:

[0032] Table 1 Composition of rotary air compressor oil additive composition

[0033]

[0034] Example 2

[0035] The composition of the rotary air compressor oil additive composition of this embodiment is shown in Table 2:

[0036] Table 2 Composition of rotary air compressor oil additive composition

[0037]

[0038] Example 3

[0039] The composition of the rotary air compressor oil additive composition of this embodiment is shown in Table 3:

[0040] Table 3 Composition of rotary air compressor oil additive composition

[0041]

[0042]

[0043] Comparative Example 1

[0044] The composition of the air compressor oil additive composition of this comparative example is shown in Table 4:

[0045] Table 4 Composition of air compressor oil additive composition

[0046]

[0047] Comparative Example 2

[0048] The composition of the air compressor oil additive composition of this comparative example is shown in Table 5:

[0049] Table 5 Composition of air compressor oil additive composition

[0050]

[0051]

[0052] The compositions obtained in Examples 1, 2, and 3 were blended with Class II base oil at an additive amount of 1% by mass of the base oil, and the obtained blended oil was subjected to performance testing. The test results of the oil are shown in Table 6 below:

[0053] Table 6 Performance test results of the compositions of Examples 1-3 after blending with Class II base oil

[0054]

[0055] As shown in the above table, the oils prepared from the compositions of Examples 1, 2 and 3 have excellent anti-rust properties, are qualified in the liquid phase corrosion method B, have excellent corrosion resistance, are 1a grade for copper sheet corrosion, have outstanding antioxidant properties, and can last for more than 1800 minutes in the rotary oxygen bomb. The evaporation loss of the aging characteristics is not more than 20% and the Conradson carbon residue value is not more than 1.0. At the same time, the anti-emulsification and anti-foaming properties are good, meeting the lubrication requirements of the rotary air compressor system.

[0056] The compositions obtained in Comparative Examples 1 and 2 were blended with Class II base oil at an additive amount of 1% by mass of the base oil, and the resulting blended oil was tested for its antioxidant properties. The test results of the oil are shown in Table 7 below:

[0057] Table 7 Performance test results of the composition of comparative example 1-2 after blending with Class II base oil

[0058] project Example 1 Comparative Example 1 Comparative Example 2 Test methods Viscosity grade 46 46 46 GB / T 3141 Liquid phase corrosion (B method) qualified Failure Failure GB / T 11143 Corrosion (copper sheet, 100℃, 3h) / level 1a 2a 2a GB / T 5096 Rotating oxygen bomb / min 2062 1491 1330 SH / T 0193

[0059] It can be seen from the above table that the oils prepared by the compositions of Comparative Examples 1 and 2 without adding ionic liquids failed the liquid phase corrosion B method, the copper sheet corrosion was level 2a, and the rotating oxygen bomb was less than 1500min, which were all worse than the oil prepared by the composition of Example 1.

Claims

1. A rotary air compressor oil additive composition, characterized in that: The composition comprises the following components by mass percentage: 20%-60% antioxidant, 10%-30% diionic liquid, 6%-12% rust inhibitor, 6%-12% metal passivator, 1%-5% anti-emulsifier, 1%-5% anti-foaming agent, and the remainder is diluent. The sum of the mass percentages of the above components is 100%.

2. The rotary air compressor oil additive composition according to claim 1, characterized in that: The antioxidant is at least one of an aromatic amine antioxidant, a bisphenol antioxidant and a phenolamine antioxidant.

3. The rotary air compressor oil additive composition according to claim 2, 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); and the phenolamine antioxidant is 2,6-di-tert-butyl α-dimethylamino-p-cresol.

4. The rotary air compressor oil additive composition according to claim 1, characterized in that: The rust inhibitor is at least one of lithium dinonylnaphthalenesulfonate, nitrogen borate, and alkenyl succinic acid half ester; the metal passivator is at least one of tolyltriazole derivatives and thiadiazole derivatives.

5. The rotary air compressor oil additive composition according to claim 1, characterized in that: The anti-emulsifier is oil-soluble polyether DL32 or LZ5957; the anti-foaming agent is T901 or T902; and the diluent is PCL150SN.

6. The rotary air compressor oil additive composition according to claim 1, characterized in that: The diionic liquid has the following structure:

7. Use of the rotary air compressor oil additive composition according to any one of claims 1 to 6 in rotary air compressor lubricating oil.

8. The use according to claim 7, characterized in that The addition amount of the rotary air compressor oil additive composition is 0.1-10% of the mass of the rotary air compressor lubricating oil.

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