High-stability antirust emulsified cutting fluid and preparation method thereof

Abstract

The invention discloses a high-stability antirust emulsified cutting fluid, which is composed of the following components by mass: 0.2-1% of a copper corrosion inhibitor, 5-10% of organic amine, 3-10% of an organic acid, 5-10% of an emulsifier, 35-45% of base oil, 1-3% of a preservative, 0.1-1% of an acidic corrosion inhibitor, 10-20% of a lubricating additive, 1-3% of a coupling agent, 0.5-2% of an antifoaming agent, and the balance of water. The emulsifier is composed of a nonionic surfactant and an anionic surfactant, and the acidic corrosion inhibitor is an imidazole compound. Compared with the existing emulsified cutting fluid, the emulsified cutting fluid has high stability in high-temperature, low-temperature, high-hardness water and slightly acidic systems, has good antirust, lubricating, cooling and cleaning performances, can effectively improve the processing efficiency, prolong the service life of equipment and improve the quality of workpieces, and is especially suitable for cutting of ferrous metals.

Description

Field of the Invention

[0001] The present invention belongs to the field of metal processing, and particularly relates to a high-stability rust-proof emulsified cutting fluid and a preparation method thereof. Background Art

[0002] With the rapid development of modern industry, especially in the field of metal processing, the requirements for cutting fluids are becoming increasingly stringent. Cutting fluids not only need to play a cooling role, but also need to have multiple functions such as lubrication, rust prevention, and cleaning to ensure the smooth progress of the processing process and the quality of the workpiece surface. Therefore, the research and development of high-performance cutting fluids has become a key direction for the development of the industry.

[0003] In practical applications, cutting fluids often need to work stably for a long time under extreme environmental conditions (such as high-temperature environments, low-temperature environments, acidic environments, and the use of hard water). However, in high-temperature environments, the viscosity, lubricity, and cooling performance of cutting fluids are easily affected; in low-temperature environments, the cutting fluid may solidify or its performance may decline; the presence of hard water may affect the emulsification effect of the cutting fluid, form scale, and further affect the stability and effect of the cutting fluid; and in a slightly acidic environment, the corrosiveness and rust prevention performance of the cutting fluid are also one of the challenges. In these extreme environments, the emulsified cutting fluids on the current market generally have many problems such as poor rust prevention performance, poor stability, and poor lubricity.

[0004] Therefore, there is an urgent need to develop a rust-proof emulsified cutting fluid that can maintain long-term stability under high and low temperatures, hard water, and slightly acidic conditions, and has excellent rust prevention, lubrication, cooling, and cleaning performance to meet the high-performance requirements of modern machining for cutting fluids. Summary of the Invention

[0005] The purpose of the present invention is to solve the problems such as poor rust prevention performance, poor stability, and poor lubricity commonly existing in existing emulsified cutting fluids, and to provide a high-stability rust-proof emulsified cutting fluid and a preparation method thereof. This cutting fluid can maintain long-term stability in high and low temperatures, high-hard water, and slightly acidic systems, and has excellent rust prevention, lubrication, cooling, and cleaning performance.

[0006] To achieve the above technical objectives, the present invention adopts the following technical solutions:

[0007] A high-stability rust-proof emulsified cutting fluid, calculated based on its total mass being 100%, is composed of the following components in mass percentages: 0.2 - 1% of copper corrosion inhibitor, 5 - 10% of organic amine, 3 - 10% of organic acid, 5 - 10% of emulsifier, 35 - 45% of base oil, 1 - 3% of preservative, 0.1 - 1% of acidic corrosion inhibitor, 10 - 20% of lubricating additive, 1 - 3% of coupling agent, 0.5 - 2% of defoamer, and the balance is water.

[0008] The emulsifier is composed of a non-ionic surfactant and an anionic surfactant. The non-ionic surfactant is selected from fatty alcohol polyoxyethylene ether, isomeric tridecanol polyoxyethylene ether, polyoxyethylene sorbitan fatty acid ester or nonylphenol polyoxyethylene ether. Among them, fatty alcohol polyoxyethylene ether includes AEO-5, AEO-10, AEO-15, etc.; isomeric tridecanol polyoxyethylene ether includes TO-5, TO-10, TO-12, etc.; polyoxyethylene sorbitan fatty acid ester includes Tween20, Tween60, Tween80, etc.; nonylphenol polyoxyethylene ether includes NP-5, NP-9, NP-10, etc. The anionic surfactant is selected from any one or a composition of two or more of sodium dodecylbenzenesulfonate, sodium dodecylsulfonate, sodium tetradecylsulfate, sodium hexadecylsulfate, sodium octadecylsulfate or sodium oleate in any proportion.

[0009] In the present invention, a non-ionic surfactant and an anionic surfactant are used in combination. Among them, the selected non-ionic surfactant has strong temperature adaptability, and the anionic surfactant enhances the emulsifying effect and stability of the emulsion, enabling it to maintain good performance even under extreme temperature conditions. In addition, the anionic surfactant can form a stable complex with metal ions in hard water, avoiding the influence of metal ions on the emulsion stability. The non-ionic emulsifier can maintain the emulsifying effect under weak acidic conditions because it does not rely on ionic groups. Through the mutual complementation of their different emulsification mechanisms, a stable emulsion is formed.

[0010] Furthermore, the copper corrosion inhibitor is selected from any one or a composition of two or more of benzotriazole, sodium mercaptobenzothiazole or methylbenzotriazole in any proportion.

[0011] Furthermore, the organic amine is selected from any one or a composition of two or more of monoethanolamine, diethanolamine, triethanolamine, 2-amino-2-methyl-1-propanol, diethylene glycol amine or isopropanolamine in any proportion.

[0012] Furthermore, the organic acid is selected from any one or a composition of two or more of alcohol ether carboxylic acid, ether carboxylic acid, pelargonic acid, neodecanoic acid, azelaic acid, sebacic acid, undecanedicarboxylic acid or dodecanedicarboxylic acid in any proportion.

[0013] Furthermore, the base oil is paraffinic oil or naphthenic oil. The paraffinic oil can be 10# paraffinic oil, 32# paraffinic oil or paraffinic oil, etc.; the naphthenic oil includes K26, K30, etc.

[0014] Further, the preservative is selected from any one of 1,2-benzisothiazol-3-one, 1,3,5-tris(hydroxyethyl)-s-triazine, butyl iodopropargylcarbamate, 4-(2-nitrobutyl)morpholine, or 4,4'-(2-ethyl-2-nitrotrimethylene)bismorpholine, or a composition of any two or more of them in any proportion.

[0015] Further, the acidic corrosion inhibitor is selected from any one of imidazole, methylimidazole, ethylimidazole, or benzimidazole, or a composition of any two or more of them in any proportion.

[0016] The acidic corrosion inhibitor of the present invention is an imidazole compound. The nitrogen atom in the imidazole molecule has a strong affinity and can chemically adsorb on the metal surface to form a stable coordination compound. This adsorption can form a protective film on the metal surface, preventing direct contact between the acidic medium and the metal, thereby slowing down the rate of the corrosion reaction. Under acidic conditions, they can better release nitrogen groups with anti-corrosion functions, enhancing the anti-corrosion ability.

[0017] Further, the lubricating additive is selected from any one of triolein, pentaerythritol tetraoleate, dioctyl adipate, neopentyl glycol dioleate, tricresyl phosphate, triethyl phosphate, organophosphate esters, chlorinated paraffin, or chlorinated fatty acid esters, or a composition of any two or more of them in any proportion.

[0018] Further, the coupling agent is selected from any one of ethylene glycol, propylene glycol, diethylene glycol butyl ether, propylene glycol methyl ether, or Guerbet alcohol, or a composition of any two or more of them in any proportion.

[0019] Further, the defoaming agent is a silicone defoaming agent (such as commercially available Dow defoaming agents AFE1267, AFE1247, AFE3168, etc.) or a polyether defoaming agent (such as commercially available Dow defoaming agents DF104, DF101, etc.).

[0020] The preparation method of the above-mentioned high-stability rust-proof emulsified cutting fluid includes the following steps:

[0021] (1) Add the copper corrosion inhibitor, organic acid, and organic amine to water, heat to 30 - 60 °C, and stir and mix evenly to obtain a first mixed solution;

[0022] (2) Add the base oil, coupling agent, emulsifier, acidic corrosion inhibitor, and lubricating additive to the first mixed solution, stir and mix evenly to obtain a second mixed solution;

[0023] (3) Add the preservative and defoaming agent to the second mixed solution, stir and mix evenly to obtain the rust-proof emulsified cutting fluid.

[0024] In steps (1), (2) and (3), the stirring speed is 1000 - 1500 rpm and the time is 30 - 60 min.

[0025] Advantages of the present invention:

[0026] 1) The emulsifier of the present invention is composed of a non - ionic surfactant and an anionic surfactant. The present invention utilizes the strong temperature adaptability of the non - ionic surfactant and the stable distribution of its hydrophilic and lipophilic groups at different temperatures to ensure that the emulsion can still maintain good emulsifying effect under extreme temperatures. The negative charge characteristic in the anionic surfactant combines with metal ions to form a stable complex, preventing metal ions from destroying the structure of the emulsion and maintaining the long - term stability of the emulsion. In addition, the non - ionic emulsifier does not rely on ionic groups and can still maintain the emulsifying effect under weak acidic conditions. The hydrophobic part in its molecule and the lipophilic group work together to optimize the lubricating performance of the emulsion.

[0027] 2) The present invention uses imidazole compounds as acid corrosion inhibitors and adds them to the emulsified cutting fluid. In an acidic environment, through adsorption, complexation, shielding and other means, it prevents the metal surface from being corroded by acid. It effectively realizes the high stability of the emulsion under high and low temperatures, hard water and slightly acidic water quality conditions, provides excellent anti - rust, lubricating and cleaning performances, effectively extends the service life of the cutting fluid and enhances its adaptability in harsh environments.

[0028] 3) The cutting fluid of the present invention still has high stability under extreme environments (high and low temperatures, high hard water, slightly acidic system), and has excellent anti - rust, lubricating, cooling and cleaning performances. It can meet the high - performance requirements of modern machining for cutting fluid, effectively improve the machining efficiency, extend the service life of the equipment and improve the workpiece quality, and is especially suitable for the cutting of ferrous metals. Specific embodiments

[0029] The technical solutions of the present invention will be clearly and completely described below with reference to specific embodiments.

[0030] Example 1

[0031] A high - stability anti - rust emulsified cutting fluid, which is composed of the following components: 0.5 g of copper corrosion inhibitor (benzotriazole), 7 g of organic amine (diethanolamine), 7 g of organic acid (sebacic acid), 5 g of emulsifier (composed of 2 g of AEO - 10 and 3 g of sodium lauryl sulfate), 40 g of base oil (K26 naphthenic oil), 2 g of preservative (1,3,5 - tris(hydroxyethyl) - s - triazine), 1 g of acid corrosion inhibitor (ethyl imidazole), 15 g of lubricating additive (triglyceride oleate), 1 g of coupling agent (diethylene glycol monobutyl ether), 1 g of silicone defoamer AFE1267, 20.5 g of water.

[0032] The above method for preparing a rust-preventive emulsified cutting fluid:

[0033] (1) Add benzotriazole, sebacic acid and diethanolamine to water, heat to 45 °C, and stir at a speed of 1000 rpm for 30 min to obtain a first mixed solution;

[0034] (2) Add K26 naphthenic oil, diethylene glycol butyl ether, AEO-10, sodium tetradecyl sulfate, ethyl imidazole and glyceryl trioleate to the first mixed solution, and stir at a speed of 1200 rpm for 30 min to obtain a second mixed solution;

[0035] (3) Add 1,3,5-tris(hydroxyethyl)-s-triazine and silicone defoamer AFE1267 to the second mixed solution, and stir at a speed of 1500 rpm for 30 min to obtain a rust-preventive emulsified cutting fluid.

[0036] Example 2

[0037] A highly stable rust-preventive emulsified cutting fluid, which is composed of the following components: 0.8 g of copper corrosion inhibitor (sodium mercaptobenzothiazole), 5 g of organic amine (2-amino-2-methyl-1-propanol), 4 g of organic acid (composed of 3 g of undecanedicarboxylic acid and 1 g of ether carboxylic acid), 10 g of emulsifier (composed of 6 g of TO-12 and 4 g of sodium dodecylbenzenesulfonate), 44 g of base oil (K30 naphthenic oil), 1 g of preservative (4-(2-nitrobutyl)morpholine), 0.2 g of acid corrosion inhibitor (benzimidazole), 12 g of lubricating additive (triethyl phosphate), 1.4 g of coupling agent (ethylene glycol), 0.5 g of polyether defoamer DF104, 21.1 g of water.

[0038] The above method for preparing a rust-preventive emulsified cutting fluid:

[0039] (1) Add sodium mercaptobenzothiazole, undecanedicarboxylic acid, ether carboxylic acid and 2-amino-2-methyl-1-propanol to water, heat to 40 °C, and stir at a speed of 1500 rpm for 60 min to obtain a first mixed solution;

[0040] (2) Add K30 naphthenic oil, ethylene glycol, AEO-10, TO-12, sodium dodecylbenzenesulfonate, benzimidazole and triethyl phosphate to the first mixed solution, and stir at a speed of 1100 rpm for 48 min to obtain a second mixed solution;

[0041] (3) Add 4-(2-nitrobutyl)morpholine and polyether defoamer DF104 to the second mixed solution, and stir at a speed of 1500 rpm for 60 min to obtain a rust-preventive emulsified cutting fluid.

[0042] Example 3

[0043] A highly stable rust-proof emulsified cutting fluid, which is composed of the following components: 0.9 g of copper corrosion inhibitor (methylbenzotriazole), 10 g of organic amine (diethylene glycol amine), 10 g of organic acid (neodecanoic acid), 8 g of emulsifier (composed of 5 g of Tween20 and 3 g of sodium oleate), 35 g of base oil (10# paraffin-based oil), 3 g of preservative (4,4'-(2-ethyl-2-nitrotrimethylene)bismorpholine), 0.5 g of acid corrosion inhibitor (imidazole), 20 g of lubricating additive (chlorinated paraffin), 3 g of coupling agent (propylene glycol methyl ether), 2 g of polyether defoamer DF104, and 7.6 g of water.

[0044] The preparation method of the above rust-proof emulsified cutting fluid:

[0045] (1) Add methylbenzotriazole, neodecanoic acid and diethylene glycol amine into water, heat to 55 °C, and stir at a speed of 1000 rpm for 30 min to obtain the first mixed solution;

[0046] (2) Add 10# paraffin-based oil, propylene glycol methyl ether, Tween20, sodium oleate, imidazole and chlorinated paraffin to the first mixed solution, and stir at a speed of 1300 rpm for 60 min to obtain the second mixed solution;

[0047] (3) Add 4,4'-(2-ethyl-2-nitrotrimethylene)bismorpholine and polyether defoamer DF104 to the second mixed solution, and stir at a speed of 1000 rpm for 48 min to obtain the rust-proof emulsified cutting fluid.

[0048] Comparative Example 1

[0049] Replace sebacic acid in Example 1 with n-octanoic acid, and keep the other components, dosages and preparation steps the same as in Example 1 to prepare a rust-proof emulsified cutting fluid.

[0050] Comparative Example 2

[0051] Replace 3 g of sodium lauryl sulfate in Example 1 with 3 g of AEO-10, and keep the other components, dosages and preparation steps the same as in Example 1 to prepare a rust-proof emulsified cutting fluid.

[0052] Comparative Example 3

[0053] Replace 2 g of AEO-10 in Example 1 with 2 g of sodium lauryl sulfate, and keep the other components, dosages and preparation steps the same as in Example 1 to prepare a rust-proof emulsified cutting fluid.

[0054] Comparative Example 4

[0055] Replace 1 g of ethyl imidazole in Example 1 with 1 g of K26 naphthenic oil as the acid corrosion inhibitor, and keep the other components, dosages and preparation steps the same as in Example 1 to prepare a rust-proof emulsified cutting fluid.

[0056] Performance test:

[0057] Perform stability test, rust prevention performance test and lubrication performance test on the rust preventive emulsified cutting fluids prepared in Examples 1-3 and Comparative Examples 1-4:

[0058] 1. Stability test

[0059] The high-temperature stability test method refers to JB / T 7453-2013 A.2.1 High-temperature test. Specifically: Place 100 mL of the rust preventive emulsified cutting fluid in a sample bottle, cover it, and put it into an oven at 50°C ± 2°C. Observe whether the sample changes color or stratifies every 4 h.

[0060] The low-temperature stability test method refers to JB / T 7453-2013 A.2.2 Low-temperature test. Specifically: Place 100 mL of the rust preventive emulsified cutting fluid in a sample bottle, cover it, and put it into a refrigerator at -18°C ± 3°C. Take it out after 2 h and observe whether the sample is uniform. Then place it at room temperature and let it stand for 1 h, and observe whether the sample changes color or stratifies.

[0061] Hard water stability test: Dilute the rust preventive emulsified cutting fluid with hard water with different calcium and magnesium ion concentrations (2000 ppm, 3000 ppm, 4000 ppm) respectively to prepare 100 mL of a rust preventive emulsified cutting fluid dilution with a mass concentration of 5%. After mixing, let it stand at room temperature for 4 h, and observe whether there is precipitation on the surface.

[0062] Acidic environment stability test method: Dilute the rust preventive emulsified cutting fluid with a phosphate buffer solution with pH = 6 to prepare 100 mL of a rust preventive emulsified cutting fluid dilution with a mass concentration of 5%. Place the dilution in a sample bottle, cover it, and put it into an oven at 50°C ± 2°C. Observe whether the sample stratifies or there is oil floating on the surface after 20 min.

[0063] 2. Rust prevention performance test

[0064] The rust prevention performance test method refers to the rust prevention performance test of water-soluble metalworking fluids - cast iron drillings / filter paper method in IP287 British iron filings rust prevention test standard.

[0065] Conventional rust prevention performance test method: Use tap water to prepare 20 g of rust preventive emulsified cutting fluid dilutions with mass concentrations of 1%, 2%, 3%, 4%, and 5% respectively. Add 1 g of iron filings to each of them, mix well, pour out the dilution, evenly place the soaked iron filings in the middle of the filter paper (within a 35 mm × 35 mm square box), place the filter paper in a petri dish, seal it with plastic wrap, and put it into an oven at 35°C ± 2°C. Take it out after 2 h, wash the surface of the filter paper, dry it, and observe the corresponding concentration at which rust appears within the square box.

[0066] Acid environment rust prevention performance test method: Prepare diluted solutions of rust prevention emulsified cutting fluids with mass concentrations of 1%, 2%, 3%, 4%, and 5% respectively using a phosphate buffer solution with pH = 6. Add 1 g of iron filings to each of them and mix well. Pour out the diluted solutions, evenly place the soaked iron filings in the center of a filter paper (within a 35 mm × 35 mm square frame), place the filter paper in a petri dish, seal it with plastic wrap, and place it in an oven at 35°C ± 2°C. After 2 h, take it out, wash the surface of the filter paper, dry it, and observe the corresponding concentration at which rust appears within the square frame.

[0067] 3. Lubrication performance test

[0068] Perform lubrication performance tests on the emulsified cutting fluids prepared in Examples 1 - 3 and Comparative Examples 1 - 4.

[0069] Conventional lubrication performance test method: Use GB / T 3142 - 2019 Determination of the load - carrying capacity of lubricants - Four - ball method to test the maximum non - seizure load (PB) and welding load (PD) of a tap water diluted solution of a rust prevention emulsified cutting fluid with a mass concentration of 4%.

[0070] Acid environment lubrication performance test method: Use GB / T 3142 - 2019 Determination of the load - carrying capacity of lubricants - Four - ball method to test the PB and PD of a diluted solution of a rust prevention emulsified cutting fluid with a mass concentration of 4% in a phosphate buffer solution (pH = 6).

[0071] 4. Cleaning performance test

[0072] Perform cleaning performance tests on the rust prevention emulsified cutting fluids prepared in Examples 1 - 3 and Comparative Examples 1 - 4. The specific method is as follows: Clean the surface of a 50 × 25 × 5 mm cast iron sheet with acetone or ethanol, dry it (105°C, 1 h), cool it, and weigh it as W0; evenly sprinkle 0.10 ± 0.01 g of dry iron powder on the surface of the test piece, gently press to ensure adhesion (to avoid falling off), and weigh it as W1; suspend and immerse the contaminated test piece in a 200 mL 5% diluted solution of the rust prevention emulsified cutting fluid prepared with tap water, stir magnetically at 100 rpm for 5 minutes, take out the test piece, rinse it with deionized water, and then dry it and weigh it as W2. The cleaning rate is calculated according to the following formula:

[0073]

[0074] The results of the stability test are shown in Table 1, and the results of the rust prevention performance, lubrication performance, and cleaning performance tests are shown in Table 2:

[0075] Table 1 Results of the stability test of the rust prevention emulsified cutting fluid

[0076]

[0077]

[0078] Table 2 Rust prevention performance, lubrication performance, and cleaning performance test results of rust preventive emulsified cutting fluid

[0079]

[0080] It can be seen from the test results in Table 1 and Table 2 that compared with the rust preventive emulsified cutting fluids of Comparative Examples 1-4, the rust preventive emulsified cutting fluids of Examples 1-3 of the present invention have high stability under high and low temperature, hard water, and slightly acidic water quality conditions, and at the same time can provide excellent rust prevention, lubrication, and cleaning performances, effectively extending the service life of the cutting fluid and enhancing its adaptability in harsh environments.

[0081] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0082] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A rust-proof emulsified cutting fluid with high stability, characterized in that, Based on 100% of its total mass, it is composed of components with the following mass percentages: 0.2 - 1% of copper corrosion inhibitor, 5 - 10% of organic amine, 3 - 10% of organic acid, 5 - 10% of emulsifier, 35 - 45% of base oil, 1 - 3% of preservative, 0.1 - 1% of acid corrosion inhibitor, 10 - 20% of lubricating additive, 1 - 3% of coupling agent, 0.5 - 2% of defoamer, and the balance is water; The emulsifier is composed of a non-ionic surfactant and an anionic surfactant. The non-ionic surfactant is selected from fatty alcohol polyoxyethylene ether, isomeric tridecyl alcohol polyoxyethylene ether, polyoxyethylene sorbitan fatty acid ester, or nonylphenol polyoxyethylene ether; the anionic surfactant is selected from any one or a composition of two or more in any proportion of sodium dodecylbenzenesulfonate, sodium dodecylsulfonate, sodium tetradecylsulfate, sodium hexadecylsulfate, sodium octadecylsulfate, or sodium oleate; The acid corrosion inhibitor is an imidazole compound.

2. The rust-preventive emulsified cutting fluid with high stability according to claim 1, characterized in that, The copper corrosion inhibitor is selected from any one or a composition of two or more in any proportion of benzotriazole, sodium mercaptobenzothiazole, or methylbenzotriazole.

3. The high-stability rust-preventive emulsified cutting fluid according to claim 1, characterized in that The organic amine is selected from any one or a composition of two or more in any proportion of monoethanolamine, diethanolamine, triethanolamine, 2-amino-2-methyl-1-propanol, diethylene glycol amine, or isopropanolamine.

4. The rust-proof emulsified cutting fluid with high stability according to claim 1, characterized in that, The organic acid is selected from any one or a composition of two or more in any proportion of alcohol ether carboxylic acid, ether carboxylic acid, pelargonic acid, neodecanoic acid, azelaic acid, sebacic acid, undecanedicarboxylic acid, or dodecanedicarboxylic acid.

5. The rust-preventive emulsified cutting fluid with high stability according to claim 1, wherein The base oil is paraffin-based oil or naphthenic oil.

6. The rust-preventive emulsified cutting fluid with high stability according to claim 1, characterized in that, The preservative is selected from any one or a composition of two or more in any proportion of 1,2-benzisothiazol-3-one, 1,3,5-tris(hydroxyethyl)-s-triazine, butyl iodopropargylcarbamate, 4-(2-nitrobutyl)morpholine, or 4,4'-(2-ethyl-2-nitrotrimethylene)dimorpholine.

7. The high-stability rust-preventive emulsified cutting fluid according to claim 1, characterized in that, The acid corrosion inhibitor is selected from any one or a composition of two or more in any proportion of imidazole, methylimidazole, ethylimidazole, or benzimidazole.

8. The highly stable rust-preventive emulsified cutting fluid according to claim 1, wherein The lubricating additive is selected from any one or a composition of two or more in any proportion of glyceryl trioleate, pentaerythritol tetraoleate, dioctyl adipate, neopentyl glycol dioleate, tricresyl phosphate, triethyl phosphate, organic phosphate ester, chlorinated paraffin, or chlorinated fatty acid ester.

9. The rust-proof emulsified cutting fluid with high stability according to any one of claims 1 to 8, characterized in that, The coupling agent is selected from any one or a composition of two or more in any proportion of ethylene glycol, propylene glycol, diethylene glycol butyl ether, propylene glycol methyl ether, or Guerbet alcohol.

10. The preparation method of the high-stability rust-proof emulsified cutting fluid according to any one of claims 1 to 9, characterized in that, It includes the following steps: (1) Add the copper corrosion inhibitor, organic acid, and organic amine to water, heat to 30 - 60 °C, and stir and mix evenly to obtain a first mixed solution; (2) Add the base oil, coupling agent, emulsifier, acid corrosion inhibitor, and lubricating additive to the first mixed solution, stir and mix evenly to obtain a second mixed solution; (3) Add the preservative and defoamer to the second mixed solution, stir and mix evenly to obtain a rust-preventive emulsified cutting fluid; In steps (1), (2), and (3), the stirring speed is 1000 - 1500 rpm, and the time is 30 - 60 min.

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