Screw air compressor oil additive composition with ultra-long oil change period and application of screw air compressor oil additive composition

Abstract

The invention belongs to the field of lubricating oil, and particularly relates to an oil additive composition for a screw air compressor with an ultra-long oil change period and application of the oil additive composition. The additive composition comprises the following raw materials in parts by weight: 50-80 parts of an antioxidant, 1-10 parts of an anti-rust agent, 1-10 parts of an anti-wear reagent at extreme pressure, 1-10 parts of a metal deactivator and 1-3 parts of an anti-foaming agent, the antioxidant is selected from an amine type antioxidant or a mixture of the amine type antioxidant and a phenol type antioxidant. The additive composition provided by the invention shows excellent oxidation resistance, provides good anti-corrosion protection for metals, and reduces the generation of oil sludge paint films. The composition is stable and excellent in performance, provides excellent protection for continuous operation (the exhaust temperature reaches up to 200 DEG C) under severe conditions and at high temperature, has an ultra-long oil change period which is up to 24,000 hours and is three times that of conventional synthetic screw air compressor oil, and can meet the lubrication requirements of vane type and rotary screw air compressor systems.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of lubricating oil, and particularly relates to an additive composition for screw air compressor oil with an ultra-long oil change period and application thereof. BACKGROUND

[0002] An air compressor is a general machine for improving the pressure of a gas by compressing the gas, is a key equipment in the industrial field, and a screw air compressor is the most widely used structural type. Traditional application fields mainly include mechanical manufacturing, mining metallurgy, clothing and textile, electronics and power, medicine and food, and the like. An additive for air compressor oil is an important factor for improving the comprehensive use performance of the oil.

[0003] Most screw air compressor oils have universality. For customers, the length of the oil change period becomes the most important index for judging the quality of the oil in the early stage of ensuring the safe operation of the equipment. Therefore, improving the performance-price ratio of the oil and prolonging the oil change period become the key to improving the technical level of the product formula of the screw air compressor oil.

[0004] Patent CN105176650A discloses a screw air compressor oil composition, which adopts synthetic hydrocarbon and ester base oil, and functional additives such as anti-wear agent, antioxidant, anti-rust agent, pour point depressant, acid capture agent, and the like. The oil product is not easy to oxidize and deteriorate, and the change of the kinematic viscosity and the acid value is small.

[0005] Patent CN103184090A discloses a screw air compressor oil additive composition, which is composed of high-temperature antioxidants composed of amine antioxidants, phenolic antioxidants and phosphite antioxidants, and extreme pressure anti-wear agents, corrosion inhibitors and anti-rust agents, and the like. The screw compressor oil is suitable for hydrogenated oil, semi-synthetic oil and PAO oil as base oil, can significantly improve the antioxidant performance of the oil product, and control the oil sludge trend.

[0006] Patent CN108865358A discloses a long-life screw air compressor oil and a preparation method thereof. The base oil is polyether and alkyl naphthalene. The additives include ashless anti-wear and anti-rust composite agent, amine high-temperature antioxidant, phenolic antioxidant, composite anti-foaming agent and metal deactivator, and can achieve a long oil change period of 12000 hours.

[0007] The above patents do not involve a scientific evaluation method for the ultra-long oil change period and the antioxidant performance of the screw air compressor oil, and no related reports are found. SUMMARY

[0008] To address the shortcomings of existing technologies, this invention provides an ultra-long oil change interval screw air compressor oil additive composition and its application. When blended with mineral or synthetic base oils, this composition yields screw air compressor oils with excellent antioxidant, corrosion-resistant, ultra-long oil change interval, and reduced varnish formation properties.

[0009] To achieve the objectives of this invention, the following technical solution is adopted:

[0010] An additive composition for an ultra-long oil change interval screw air compressor oil is characterized in that, by weight, the raw materials of the additive composition include 50-80 parts of antioxidant, 1-10 parts of rust inhibitor, 1-10 parts of extreme pressure anti-wear agent, 1-10 parts of metal passivator, and 1-3 parts of antifoaming agent; wherein the antioxidant is selected from amine antioxidants or a mixture of amine antioxidants and phenolic antioxidants.

[0011] Preferably, the amine antioxidant comprises alkylated diphenylamine and N-phenyl-α-naphthylamine compounds in a mass ratio of 2-5:1.

[0012] Preferably, the alkylated diphenylamine is selected from butyl-octyl diphenylamine or dinonyl diphenylamine, and the N-phenyl-α-naphthylamine compound is selected from N-phenyl-α-naphthylamine or alkyl N-phenyl-α-naphthylamine.

[0013] Preferably, the phenolic antioxidant is selected from liquid high molecular weight phenols or 2,6-di-tert-butyl-p-cresol compounds.

[0014] Preferably, the 2,6-di-tert-butyl-p-cresol compound is selected from 4,4'-methylenebis(2,6-di-tert-butylphenol) or 2,6-di-tert-butyl-α-dimethylamino-p-cresol.

[0015] Preferably, the rust inhibitor is one or two of alkenyl succinic acid, alkenyl succinic acid half ester, and barium dinonylnaphthalene sulfonate.

[0016] Preferably, the metal passivating agent is selected from benzotriazole or its derivatives, methylbenzotriazole or its derivatives, or N,N-dialkylaminomethylenebenzotriazole or its derivatives.

[0017] Preferably, the extreme pressure anti-wear agent is selected from one of alkyl phosphate esters, alkyl phosphites, and alkyl thiophosphate esters.

[0018] Preferably, the alkyl phosphate is selected from dioleophosphate or trialkyl phosphate;

[0019] Preferably, the alkyl phosphite is selected from dialkyl phosphites or trialkyl phosphites;

[0020] Preferably, the alkyl thiophosphate is selected from butyltriphenyl thiophosphate or dialkyl dithiophosphate.

[0021] Preferably, the antifoaming agent is one or more of siloxane-type defoamers and polyacrylate-type defoamers.

[0022] Preferably, the polyacrylate defoamer is Foam Ban 3633E and / or Hi TEC 2030.

[0023] Preferably, the antifoaming agent is either No. 1 composite antifoaming agent or No. 2 composite antifoaming agent.

[0024] Preferably, the additive composition further includes neutral oil 6cSt.

[0025] Another object of the present invention is to provide an application of an additive composition in the preparation of lubricating oil products.

[0026] Preferably, in the lubricating oil product, the additive composition comprises 0.1-5% by mass.

[0027] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0028] This invention provides an additive composition for screw air compressor oil with an ultra-long oil change interval, exhibiting excellent antioxidant properties while providing good corrosion protection for metals and reducing the formation of sludge and varnish. The composition demonstrates stable and excellent performance, providing superior protection under harsh conditions and continuous operation at high temperatures (exhaust temperatures up to 200°C), and features an ultra-long oil change interval, measured at up to 24,000 hours, three times that of conventional synthetic screw air compressor oils. This meets the lubrication requirements of vane and rotary screw air compressor systems. Detailed Implementation

[0029] The present invention will be further described below with reference to specific embodiments.

[0030] Example 1

[0031] The formulation of the additive composition is shown in Table 1 below.

[0032] Table 1

[0033]

[0034] Example 2

[0035] The formulation of the additive composition is shown in Table 2 below.

[0036] Table 2

[0037]

[0038] Example 3

[0039] The formulations of the additive compositions are shown in Table 3 below.

[0040] Table 3

[0041]

[0042] Example 4

[0043] The formulation of the additive composition is shown in Table 4 below.

[0044] Table 4

[0045]

[0046] Example 5

[0047] The formulations of the additive compositions are shown in Table 5 below.

[0048] Table 5

[0049]

[0050] Comparative Example 1

[0051] The formulations of the additive compositions are shown in Table 6 below.

[0052] Table 6

[0053]

[0054] Comparative Example 2

[0055] The formulations of the additive compositions are shown in Table 7 below.

[0056] Table 7

[0057]

[0058]

[0059] Comparative Example 3

[0060] The formulations of the additive compositions are shown in Table 8 below.

[0061] Table 8

[0062]

[0063] Taking Examples 1-5 and Comparative Examples 1-3 as examples, after blending with Group IV base oil at a mass percentage of 2.0%, the test results of the oil are shown in Tables 9-10 below.

[0064] Table 9

[0065]

[0066]

[0067] Table 10

[0068]

[0069]

[0070] In summary, the screw air compressor oil additive compositions described in Examples 1-5 exhibit excellent oxidation resistance, achieving a rotary oxygen bomb time of over 1700 min. They also demonstrate outstanding anti-wear properties, achieving an FZG failure level of 12, generating minimal carbon residue with a Comtancus carbon residue increase of no more than 0.3%. Furthermore, they exhibit excellent rust prevention, anti-foaming, and demulsification properties, effectively extending the oil's service life and meeting the lubrication requirements of screw air compressor systems.

Claims

1. An additive composition for screw air compressor oil with an ultra-long oil change period, characterized in that, The additive composition comprises, by weight, 50-80 parts antioxidant, 1-10 parts rust inhibitor, 1-10 parts extreme pressure anti-wear agent, 1-10 parts metal passivator and 1-3 parts anti-foaming agent; The antioxidant is selected from amine antioxidants or a mixture of amine antioxidants and phenolic antioxidants.

2. The additive composition according to claim 1, characterized in that, The amine-type antioxidant comprises alkylated diphenylamine and N-phenyl-α-naphthylamine compounds in a mass ratio of 2-5:

1.

3. The additive composition according to claim 2, characterized in that, The alkylated diphenylamine is selected from butoctyl diphenylamine or dinonyl diphenylamine, and the N-phenyl-α-naphthylamine compound is selected from N-phenyl-α-naphthylamine or alkyl N-phenyl-α-naphthylamine.

4. The additive composition according to claim 1, characterized in that, The phenolic antioxidant is selected from liquid high molecular weight phenols or 2,6-di-tert-butyl-p-cresol compounds.

5. The additive composition according to claim 4, characterized in that, The 2,6-di-tert-butyl-p-cresol compound is selected from 4,4'-methylenebis(2,6-di-tert-butylphenol) or 2,6-di-tert-butyl-α-dimethylamino-p-cresol.

6. The additive composition according to claim 1, characterized in that, The rust inhibitor is one or two of alkenyl succinic acid, alkenyl succinic acid half ester, and barium dinonylnaphthalene sulfonate.

7. The additive composition according to claim 1, characterized in that, The metal passivating agent is selected from benzotriazole or its derivatives, methylbenzotriazole or its derivatives, or N,N-dialkylaminomethylenebenzotriazole or its derivatives.

8. The additive composition according to claim 1, characterized in that, The extreme pressure anti-wear agent is selected from one of alkyl phosphate esters, alkyl phosphites, and alkyl thiophosphate esters.

9. The additive composition according to claim 8, characterized in that, The alkyl phosphate ester is selected from dialkyl phosphate ester or trialkyl phosphate ester; the alkyl phosphite ester is selected from dialkyl phosphite ester or trialkyl phosphite ester; the alkyl thiophosphate ester is selected from butyltriphenyl thiophosphate ester or dialkyl dithiophosphate ester.

10. The additive composition according to claim 1, characterized in that, The antifoaming agent is one or more of the following: siloxane-type defoamers and polyacrylate-type defoamers.

11. The additive composition according to claim 1, characterized in that, The polyacrylate defoamer is Foam Ban3633E and / or Hi TEC 2030.

12. The additive composition according to claim 10, characterized in that, The antifoaming agent is either No. 1 composite antifoaming agent or No. 2 composite antifoaming agent.

13. The additive composition according to any one of claims 1-12, characterized in that, The additive composition also includes neutral oil 6cSt.

14. The use of an additive composition according to any one of claims 1-13 in the preparation of a lubricating oil product.

15. The application according to claim 14, characterized in that, In the lubricating oil product, the additive composition has a mass percentage of 0.1-5%.

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