Metal cutting oil, its preparation method and application

Abstract

This invention provides a metal cutting oil, its preparation method, and its application. The metal cutting oil comprises the following components by mass percentage: 10-15% oiliness agent, 3-5% extreme pressure agent, 0.5-1% antioxidant, and the balance being base oil; wherein the oiliness agent is composed of a base oil with a viscosity of 30-450 mmHg. 2 / s high viscosity oily agent with viscosity of 5-15mm 2 The low-viscosity oily agent is composed of a mass ratio of 5:(1-7). The cutting oil provided by this invention has good extreme pressure lubrication performance and high and low temperature stability, and can prevent phenomena such as tool sticking and welding during aluminum alloy cutting. It is suitable for cutting aluminum alloys.

Description

Technical Field

[0001] This invention belongs to the field of lubricating oil technology for machining, specifically relating to a metal cutting oil, its preparation method, and its application. Background Technology

[0002] Aluminum alloy is a material with low density, high strength, excellent plasticity, and corrosion resistance. It is mainly composed of alloying elements such as copper, zinc, manganese, silicon, and magnesium. Its industrial application is second only to steel, and it is widely used in aerospace, automobile manufacturing, chemical industry and other fields.

[0003] Common problems encountered in aluminum alloy machining include: 1. Aluminum alloys are chemically relatively reactive and easily corroded in acidic and alkaline environments; 2. Aluminum alloys have low melting points, low elastic modulus, and are relatively soft, making them prone to tool sticking during machining. The aluminum chips generated during machining accumulate near the cutting edge, increasing machining difficulty, and under high temperature and speed, welding may even occur on the cutting edge; 3. Aluminum alloys have a high coefficient of thermal expansion, and the enormous heat generated during high-speed machining can easily cause workpiece deformation. Therefore, cutting oils for aluminum alloy machining need to have the following characteristics: 1. Relatively mild pH to prevent blackening of the aluminum alloy during machining and improve gloss; 2. Good extreme pressure anti-wear properties to maintain lubrication even under high-speed and high-pressure machining environments; 3. Good cooling capacity to prevent thermal expansion due to overheating.

[0004] Most commonly used aluminum alloy cutting fluids are water-based. Water-based cutting fluids have poor extreme pressure and anti-wear properties, are prone to solidification at low temperatures, and their lubrication and rust prevention properties are also difficult to achieve as expected.

[0005] Therefore, it is essential to develop a cutting oil for aluminum alloys that has high lubricity, high extreme pressure anti-wear properties, and resistance to high and low temperatures. Summary of the Invention

[0006] To address the shortcomings of existing technologies, the present invention aims to provide a metal cutting oil, its preparation method, and its application. This cutting oil exhibits excellent extreme pressure lubrication performance and high and low temperature stability, preventing phenomena such as tool sticking and welding during aluminum alloy cutting, and is suitable for aluminum alloy cutting.

[0007] To achieve this objective, the present invention adopts the following technical solution:

[0008] In a first aspect, the present invention provides a metal cutting oil, the metal cutting oil comprising the following components by mass percentage:

[0009] Oiliness agent 10-15%, extreme pressure agent 3-5%, antioxidant 0.2-1%, and balance base oil;

[0010] The oily agent has a viscosity of 30-450 mm. 2 / s high viscosity oily agent with viscosity of 5-15mm 2 The low-viscosity oily agent is composed of a mass ratio of 5:(1-7).

[0011] In this invention, the mass percentage of the oily agent can be, for example, 10%, 10.5%, 11%, 11.5%, 12%, 12.5%, 13%, 13.5%, 14%, 14.5%, or 15%.

[0012] The mass percentage of the extreme pressure agent can be, for example, 3%, 3.2%, 3.5%, 3.8%, 4%, 4.2%, 4.5%, 4.8%, or 5%.

[0013] The mass percentage of the antioxidant may be, for example, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, or 1%.

[0014] The viscosity of the high-viscosity oily agent can be 30 mm. 2 / s, 35mm 2 / s, 40mm 2 / s, 45mm 2 / s, 50mm 2 / s, 55mm 2 / s, 60mm 2 / s, 70mm 2 / s, 80mm 2 / s, 90mm 2 / s, 100mm 2 / s, 120mm 2 / s, 150mm 2 / s, 180mm 2 / s, 200mm 2 / s, 220mm 2 / s, 250mm 2 / s, 280mm 2 / s, 300mm 2 / s, 320mm 2 / s, 350mm 2 / s, 380mm 2 / s, 400mm 2 / s, 420mm 2 / s or 450mm 2 / s etc.

[0015] The viscosity of low-viscosity oily agents can be 5 mm. 2 / s, 6mm 2 / s, 7mm 2 / s, 8mm 2 / s, 9mm2 / s, 10mm 2 / s, 11mm 2 / s, 12mm 2 / s, 13mm 2 / s, 14mm 2 / s or 15mm 2 / s etc.

[0016] The mass ratio of the high-viscosity oily agent to the low-viscosity oily agent can be 5:1, 5:2, 5:3, 5:4, 5:5, 5:6, or 5:7, etc.

[0017] It should be noted that the viscosity of the high-viscosity oily agent and the low-viscosity oily agent mentioned in this invention refers to the kinematic viscosity at 40°C.

[0018] Oily agent

[0019] Oiliness agents can adsorb onto metal friction surfaces through polar groups, forming a molecularly oriented adsorption film that blocks direct contact between metals, thereby reducing friction and wear. Since extreme pressure agents only play a crucial role under high temperature and high pressure environments and are difficult to lubricate under normal temperature and low load conditions, oiliness agents need to be added to cutting oils to ensure lubrication performance during metal cutting under normal temperature and pressure conditions.

[0020] This invention improves the lubrication performance of metal cutting oil by using a high-viscosity oiling agent and a low-viscosity oiling agent in a specific ratio to synergistically combine them.

[0021] In some embodiments of the present invention, the high-viscosity oily agent is selected from one or more of tall oil, hydrogenated palm oil, oxidized rapeseed oil, and tetrameric castor oil.

[0022] In some embodiments of the present invention, the low-viscosity oiliness agent is selected from one or more of isopropyl palmitate, diisotridecyl adipate, bis(2-ethylhexyl sebacate) and 2-ethylhexyl oleate.

[0023] Extreme pressure agent

[0024] Extreme pressure additives are additives that can form a high-melting-point chemical reaction film with the metal surface under high-temperature and high-pressure boundary lubrication conditions. In aluminum alloy cutting, the chemical reaction film effectively prevents the welding phenomenon between aluminum chips and the cutting tool under high temperature and high speed.

[0025] In some embodiments of the present invention, the extreme pressure agent is selected from one or more of phosphate esters, ammonium phosphate salts, and phosphoramides, preferably phosphate esters and / or ammonium phosphate salts. Preferred extreme pressure agents exhibit excellent extreme pressure performance, are more readily soluble in base oils, and can more effectively prevent aluminum alloy corrosion in practical use.

[0026] For example, the phosphate esters mentioned in this invention include, but are not limited to, dialkyl thiophosphate esters, lauryl phosphate esters, and fatty alcohol polyoxyethylene ether phosphate esters; the ammonium salts of phosphate esters include, but are not limited to, alkyl phosphate ester ammonium salts, fatty alcohol phosphate ester ammonium salts, and alkylphenol polyether phosphate ester triethanolamine salts.

[0027] antioxidants

[0028] Antioxidants are additives that prevent polymer aging and extend polymer life by delaying or inhibiting polymer oxidation. Since cutting oils are used repeatedly over long periods, a small amount of effective antioxidants is essential to prevent easily oxidizable substances (such as phosphate esters, self-emulsifying esters, tall oils, etc.) from being oxidized at high temperatures over extended periods.

[0029] In some embodiments of the present invention, the antioxidant is selected from one or more of the reaction product of N-phenylaniline and 2,4,4-trimethylpentene (antioxidant 5057), N-phenyl-α-naphthylamine, alkylphenthiazide, 4,4-dioctyldiphenylamine, 2,6-di-tert-butyl-p-cresol, and 2,6-di-tert-butylamino-p-cresol, preferably the reaction product of N-phenylaniline and 2,4,4-trimethylpentene and / or N-phenyl-α-naphthylamine. Preferred antioxidants are more stable in cutting oils and more effectively prevent oxidation.

[0030] corrosion inhibitor

[0031] Since some parts used in cutting machines contain copper, aluminum, and iron, and the extreme pressure additives in the additives may cause certain corrosion, the cutting oil in this invention preferably also contains corrosion inhibitors in order to alleviate this corrosion.

[0032] In some embodiments of the present invention, the corrosion inhibitor is 0.3-0.5% by mass; for example, it may be 0.3%, 0.32%, 0.35%, 0.38%, 0.4%, 0.42%, 0.45%, 0.48%, or 0.5%, etc.

[0033] In some embodiments of the present invention, the corrosion inhibitor is selected from one or more of mercaptobenzothiazole, benzotriazole, methylbenzotriazole, and sodium methylbenzotriazole, preferably benzotriazole and / or methylbenzotriazole. Preferred corrosion inhibitors have stronger oil solubility and can exist more stably in cutting oils.

[0034] Anti-oil mist agent

[0035] Anti-fogging agents are additives that reduce the surface tension of a liquid, making it more difficult for it to form droplets or oil mist. They can also disperse particles or tiny droplets in a liquid, maintaining its stability. Since cutting oils need to be used repeatedly over long periods, the addition of anti-fogging agents helps reduce the formation of oil mist during machining, thus reducing oil mist pollution. Therefore, the cutting oil in this invention preferably also contains an anti-fogging agent.

[0036] In some embodiments of the present invention, the mass percentage of the anti-oil mist agent is 1-2%; for example, it may be 1%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, or 2%, etc.

[0037] In some embodiments of the present invention, the anti-oil mist agent is selected from one or more of polyisobutylene, polyacrylate and ethylene propylene copolymer.

[0038] Coupling agent

[0039] A coupling agent is an additive that promotes a reaction by linking two or more oily agents or base oil molecules, thereby creating bonds between the reactants. Since cutting oils need to be stored or used for extended periods, adding a small amount of coupling agent can make the cutting oil more stable and less prone to oil separation and stratification. Therefore, the cutting oil in this invention preferably also contains a coupling agent.

[0040] In some embodiments of the present invention, the mass percentage of the coupling agent is 1-2%; for example, it may be 1%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, or 2%, etc.

[0041] In some embodiments of the present invention, the coupling agent is selected from one or more of C16 Guerbert alcohol, diethylene glycol monobutyl ether, a mixture of C14 and C15 monobranched alcohols, lauryl alcohol, and ethylene glycol, preferably one or more of C16 Guerbert alcohol, diethylene glycol monobutyl ether, and a mixture of C14 and C15 monobranched alcohols.

[0042] emulsifier

[0043] An emulsifier is an additive that enables a mixture of multiple immiscible components to form a stable emulsion. Emulsifiers reduce the interfacial tension of the components in the mixture, making it easier for the cutting oil to combine with water and form an emulsion during the removal of the cutting oil, thus achieving good oil removal capabilities. Therefore, the cutting oil in this invention preferably also contains an emulsifier.

[0044] In some embodiments of the present invention, the mass percentage of the emulsifier is 3-5%; for example, it may be 3%, 3.2%, 3.5%, 3.8%, 4%, 4.2%, 4.5%, 4.8%, or 5%, etc.

[0045] In some embodiments of the present invention, the emulsifier is selected from one or more of alkoxylated fatty alcohols, polysorbates, sorbitol monooleate, alcohol ether carboxylic acids, and fatty alcohol polyoxyethylene ethers, preferably one or more of alkoxylated fatty alcohols, polysorbates, and sorbitol monooleate. Preferred emulsifiers enhance hydrophilicity, making the cutting oil easier to wash away with water.

[0046] In some embodiments of the present invention, the base oil is paraffin oil, preferably white oil.

[0047] In some embodiments of the present invention, the metal cutting oil comprises the following components by mass percentage:

[0048] Oiliness agent 10-15%, extreme pressure agent 3-5%, antioxidant 0.2-1%, corrosion inhibitor 0.3-0.5%, anti-oil mist agent 1-2%, coupling agent 1-2%, emulsifier 3-5%, and the balance base oil.

[0049] In a second aspect, the present invention provides a method for preparing metal cutting oil as described in the first aspect, the method comprising the following steps:

[0050] The components are mixed in the specified proportions until the mixture is clear and transparent to obtain the metal cutting oil.

[0051] In some embodiments of the present invention, the preparation method includes the following steps:

[0052] (1) Mix the base oil, oiliness agent and extreme pressure agent, and stir at 55-60℃ until the solution is clear and transparent;

[0053] (2) Add an antioxidant, optionally a corrosion inhibitor, and optionally an anti-oil mist agent to the mixed solution obtained in step (1), and stir until the solution is clear and transparent;

[0054] (3) Add optional coupling agent and optional emulsifier to the mixed solution obtained in step (2), and stir until the solution is clear and transparent to obtain the metal cutting oil.

[0055] It should be noted that "optionally" in steps (2) and (3) above means adding or not adding, and whether or not to add depends on whether the metal cutting oil described in the first aspect contains the component.

[0056] Thirdly, the present invention provides an application of the metal cutting oil as described in the first aspect, wherein the metal cutting oil is used for metal cutting, preferably for aluminum alloy cutting.

[0057] Compared with the prior art, the present invention has the following beneficial effects:

[0058] (1) Good lubricity: The extreme pressure agent and oiliness agent in the cutting oil provided by the present invention can be uniformly dispersed in the cutting oil. When used, they can form a uniform and continuous lubricating film on the metal surface, thus having high lubricity. When used for cutting aluminum alloys, it can prevent phenomena such as tool sticking and welding during the cutting process, and effectively reduce the wear of tools and workpieces during the cutting process.

[0059] (2) Safety and environmental protection: This invention does not contain harmful substances such as sulfur, chlorine, and nitrite, is safe to store, does not irritate the skin and respiratory tract during use, is easily degradable, and is environmentally friendly;

[0060] (3) Good corrosion inhibition and rust prevention performance: The cutting oil provided by this invention does not contain additives with high alkalinity and high acidity, while phosphate ester and ammonium phosphate salt extreme pressure agent can more effectively inhibit the corrosion of aluminum alloy under high temperature conditions.

[0061] (4) Good cleaning performance: By further adding emulsifier to the cutting oil, the resulting cutting oil can be dissolved in water. After the workpiece is processed, the oil residue on the metal surface can be removed simply by rinsing with water. No additional cleaning agent is required, which further reduces the emission of chemical substances. Detailed Implementation

[0062] The technical solution of the present invention will be further illustrated below through specific embodiments. Those skilled in the art should understand that the specific embodiments described are merely illustrative of the invention and should not be construed as limiting the invention.

[0063] The sources of the raw materials used in the embodiments of the present invention are as follows:

[0064] 5#, 7#, and 10# white oil: Junyan New Material Technology (Shanghai) Co., Ltd.;

[0065] Tall oil: Tianjin Haoruisen, viscosity 30-50 mm 2 / s;

[0066] Tetrameric castor oil: ML-4 from Shanghai Milin Chemical Co., Ltd., viscosity 350-450 mm. 2 / s;

[0067] Isopropyl palmitate: Malaysian KLK, viscosity 5-10 mm 2 / s;

[0068] Oxidized rapeseed oil: Zhejiang Kebang Litte Oil Co., Ltd., viscosity 210-226 mm 2 / s;

[0069] Hydrogenated palm oil: Suzhou Fuzhiyuan Biotechnology Co., Ltd., viscosity 35-55 mm 2 / s;

[0070] Diisotridecyl adipic acid: Solvay, viscosity 10-15 mm 2 / s;

[0071] Di(2-ethylhexyl) sebacic acid: Solvay, viscosity 10-15 mm 2 / s;

[0072] 2-Ethylhexyl oleate: Solvay, viscosity 8-13 mm 2 / s;

[0073] Ammonium phosphate salt: Hongze Chemical, EP160H;

[0074] Phosphate ester: Lubrizol, USA IC9AW31;

[0075] Fatty phosphate esters: Lubrizol, USA, ADDCO TM 360-P;

[0076] Benzotriazole: Zhenjiang Bohan Chemical Technology Co., Ltd.;

[0077] Sodium methylbenzotriazole: Yangying Group GmbH, Germany;

[0078] The reaction product of N-phenylaniline and 2,4,4-trimethylpentene (antioxidant 5057): Panhua Chemical (Shanghai) Co., Ltd.;

[0079] N-Phenylan-α-Naphthylamine: Shanghai Maclean Biochemical Technology Co., Ltd.;

[0080] 2,6-Di-tert-butylamino-p-cresol: Shanghai Maclean Biochemical Technology Co., Ltd.;

[0081] Polyisobutylene: Daelim, South Korea, PB-400;

[0082] Polyacrylate: Sigma-Aldrich;

[0083] Ethylene-propylene copolymer: Sigma-Aldrich;

[0084] C14-C15 monobranched alcohol mixture: Sasol, Germany, ISALCHEM 145;

[0085] C16 Gelbert alcohol: Sasol, Germany;

[0086] Diethylene glycol monobutyl ether: Dow Chemical, USA;

[0087] Fatty alcohol polyoxyethylene ether: Sasol, Germany, AEO-3;

[0088] Sorbitol monooleate: Croda, UK, Span-80;

[0089] Alkoxylated fatty alcohols: Sasol (Germany), RT-42.

[0090] In this embodiment of the invention, the test method for the performance of metal cutting oil is as follows:

[0091] (1) Kinematic viscosity (40℃, mm) 2 / s)(GB / T 265), Flash point (open cup, ℃))(GB / T3536), Pour point (℃))(GB / T 3535), Copper strip corrosion (grade))(GB / T 5096), Saponification value (mgKOH / g))(GB / T 5530), Aluminum strip corrosion (ADC12))(GB / T 6144), Cast iron strip corrosion (HT300))(GB / T 6144.

[0092] (2) Extreme pressure performance test method: According to GB / T12583-1998, the maximum non-seize load P is tested. B sintering load P D Tester model: Xiamen Tianji MS-10A.

[0093] (3) Test method for tapping torque: tapping speed 2000 r / min, depth 20 mm, maximum torque 300 N·cm, cutting tool: TTT-M4F-TIN-T; 7075 aluminum: TTT-testbar1.0503-M4F / 3.7 20 mm. Tester model: TAPTTTSystem-G8.

[0094] (4) Cleaning performance test method: 5 grams of test sample were evenly coated on the surface of the Q-panel and weighed; then placed in a constant temperature oven at 100℃ for 1 hour; after removal, it was placed in a beaker containing 1L of water and ultrasonically cleaned for 5 minutes; after cleaning, it was placed in a constant temperature oven at 100℃ for 1 hour, removed and weighed; the weight change before and after was calculated. Residual oil rate = weight change / initial weight of sample × 100%.

[0095] In this embodiment of the invention, the preparation method of the metal cutting oil is as follows:

[0096] (1) Mix the base oil, oiliness agent and extreme pressure agent, and stir at 60°C until the solution is clear and transparent;

[0097] (2) Add antioxidant, corrosion inhibitor and anti-oil mist agent to the mixed solution obtained in step (1) and stir until the solution is clear and transparent;

[0098] (3) Add coupling agent and emulsifier to the mixed solution obtained in step (2), and stir until the solution is clear and transparent to obtain the metal cutting oil.

[0099] Example 1, Example 1', Comparative Examples 1-1 to 1-4

[0100] Example 1, Example 1', and Comparative Examples 1-1 to 1-4 each provide a metal cutting oil, the composition (wt%) of which is shown in Table 1 below.

[0101] Table 1

[0102]

[0103] The performance test results of the metal cutting oils provided in Examples 1, 1', and Comparative Examples 1-1 to 1-4 are shown in Table 2 below.

[0104] Table 2

[0105]

[0106]

[0107] As can be seen from the test results in Table 2, compared with Example 1, the ratio of high-viscosity oiling agent to low-viscosity oiling agent in Comparative Examples 1-1 to 1-4 exceeds the range described in this invention, resulting in a decrease in the P of the metal cutting oil. B and P D The decrease in viscosity, increase in tapping torque, and decrease in lubrication performance indicate that the high-viscosity oiliness agent and the low-viscosity oiliness agent in this invention, within the ratio range described in this invention, have a synergistic effect in improving the lubrication performance of metal cutting oil. Compared with Example 1, the lack of emulsifier in Example 1' resulted in poorer cleaning performance of the metal cutting oil, but no significant change in lubrication performance.

[0108] Example 2, Example 2', Comparative Examples 2-1 to 2-4

[0109] Example 2, Example 2', and Comparative Examples 2-1 to 2-4 each provide a metal cutting oil, the composition (wt%) of which is shown in Table 3 below.

[0110] Table 3

[0111]

[0112] The performance test results of the metal cutting oils provided in Examples 2, 2′, and Comparative Examples 2-1 to 2-4 are shown in Table 4 below.

[0113] Table 4

[0114]

[0115]

[0116] As can be seen from the test results in Table 4, compared with Example 2, the ratio of high-viscosity oiling agent to low-viscosity oiling agent in Comparative Examples 2-1 to 2-4 exceeds the range described in this invention, resulting in a decrease in the P of the metal cutting oil. B and P D The decrease in viscosity, increase in tapping torque, and decrease in lubrication performance indicate that the high-viscosity oiliness agent and the low-viscosity oiliness agent in this invention, within the ratio range described in this invention, have a synergistic effect in improving the lubrication performance of metal cutting oil. Compared with Example 2, the lack of emulsifier in Example 2' resulted in poorer cleaning performance of the metal cutting oil, but no significant change in lubrication performance.

[0117] Example 3, Example 3', Comparative Examples 3-1 to 3-4

[0118] Example 3, Example 3', and Comparative Examples 3-1 to 3-4 each provide a metal cutting oil, the composition (wt%) of which is shown in Table 5 below.

[0119] Table 5

[0120]

[0121] The performance test results of the metal cutting oils provided in Examples 3, 3′, and Comparative Examples 3-1 to 3-4 are shown in Table 6 below.

[0122] Table 6

[0123]

[0124]

[0125] As can be seen from the test results in Table 6, compared with Example 3, the ratio of high-viscosity oiling agent to low-viscosity oiling agent in Comparative Examples 3-1 to 3-4 exceeds the range described in this invention, resulting in a decrease in the P of the metal cutting oil. B and P D The decrease in viscosity, increase in tapping torque, and decrease in lubrication performance indicate that the high-viscosity oiliness agent and the low-viscosity oiliness agent in this invention, within the ratio range described in this invention, have a synergistic effect in improving the lubrication performance of metal cutting oil. Compared with Example 3, the lack of emulsifier in Example 3' resulted in poorer cleaning performance of the metal cutting oil, but no significant change in lubrication performance.

[0126] The above description is merely a specific embodiment of this disclosure, enabling those skilled in the art to understand or implement it. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this disclosure. Therefore, this disclosure is not to be limited to the embodiments described herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A metal cutting oil characterized in that, The metal cutting oil comprises the following components by mass percentage: Oiliness agent 10-15%, extreme pressure agent 3-5%, antioxidant 0.2-1%, corrosion inhibitor 0.3-0.5%, anti-oil mist agent 1-2%, coupling agent 1-2%, emulsifier 3-5%, and balance base oil; The oily agent is composed of high viscosity oily agent with viscosity of 30-450 mm 2 / s at 40℃ and low viscosity oily agent with viscosity of 5-15 mm 2 / s at 40℃ in a mass ratio of 5:(1-7). The high-viscosity oily agent is selected from one or more of tall oil, hydrogenated palm oil, oxidized rapeseed oil, and tetrameric castor oil; The low-viscosity oiliness agent is selected from one or more of isopropyl palmitate, diisotridecyl adipate, bis(2-ethylhexyl sebacate) and 2-ethylhexyl oleate.

2. The metal cutting oil of claim 1, wherein, The extreme pressure agent is selected from one or more of phosphate esters, ammonium phosphate salts, and phosphoramides.

3. The metal cutting oil of claim 2, wherein, The extreme pressure agent is a phosphate ester and / or an ammonium phosphate ester salt.

4. The metal cutting oil of claim 1, wherein, The antioxidant is selected from one or more of the reaction product of N-phenylaniline and 2,4,4-trimethylpentene, N-phenyl-α-naphthylamine, alkylphenthiazide, 4,4-dioctyldiphenylamine, 2,6-di-tert-butyl-p-cresol, and 2,6-di-tert-butylamino-p-cresol.

5. The metal cutting oil of claim 4, wherein, The antioxidant is the reaction product of N-phenylaniline and 2,4,4-trimethylpentene and / or N-phenyl-α-naphthylamine.

6. The metal cutting oil of claim 1, wherein, The corrosion inhibitor is selected from one or more of mercaptobenzothiazole, benzotriazole, methylbenzotriazole, and sodium methylbenzotriazole.

7. The metal cutting oil of claim 6, wherein, The corrosion inhibitor is benzotriazole and / or methylbenzotriazole.

8. The metal cutting oil of claim 1, wherein, The anti-oil mist agent is selected from one or more of polyisobutylene, polyacrylate and ethylene propylene copolymer.

9. The metal cutting oil of claim 1, wherein, The coupling agent is selected from one or more of C16 Gelbert alcohol, diethylene glycol monobutyl ether, a mixture of C14 and C15 branched alcohols, lauryl alcohol, and ethylene glycol.

10. The metal cutting oil of claim 9, wherein, The coupling agent is one or more of C16 Guerbert alcohol, diethylene glycol monobutyl ether, and a mixture of C14 and C15 monobranched alcohols.

11. The metal cutting oil of claim 1, wherein, The emulsifier is selected from one or more of alkoxylated fatty alcohols, polysorbates, monooleic sorbitol esters, and alcohol ether carboxylic acids.

12. The metal cutting oil of claim 11, wherein, The alkoxylated fatty alcohol is a fatty alcohol polyoxyethylene ether.

13. The metal cutting oil of claim 11, wherein, The emulsifier is one or more of alkoxylated fatty alcohols, polysorbates, and sorbitol monooleate.

14. The metal cutting oil according to claim 1, characterized in that, The base oil is paraffin oil.

15. The metal cutting oil according to claim 14, characterized in that, The base oil is white oil.

16. A method for preparing a metal cutting oil according to any one of claims 1-15, characterized in that, The preparation method includes the following steps: The components are mixed in the specified proportions until the mixture is clear and transparent to obtain the metal cutting oil.

17. The preparation method according to claim 16, characterized in that, The preparation method includes the following steps: (1) Mix the base oil, oiliness agent and extreme pressure agent, and stir at 55-60℃ until the solution is clear and transparent; (2) Add antioxidant, corrosion inhibitor and anti-oil mist agent to the mixed solution obtained in step (1) and stir until the solution is clear and transparent; (3) Add coupling agent and emulsifier to the mixed solution obtained in step (2), and stir until the solution is clear and transparent to obtain the metal cutting oil.

18. The application of a metal cutting oil as described in any one of claims 1-15, characterized in that, The metal cutting oil is used for metal cutting.

19. The application according to claim 18, characterized in that, The metal cutting oil is used for cutting aluminum alloys.

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