Water-based fully-synthetic cutting fluid as well as preparation method and application thereof

Abstract

The invention relates to the technical field of metal working fluids, in particular to a water-based fully-synthetic cutting fluid as well as a preparation method and application thereof. The water-based total synthesis cutting fluid is prepared from the following raw materials in percentage by weight: 52.5 to 83.48 percent of water, 3.0 to 10.0 percent of an extreme pressure anti-wear agent, 10.0 to 25.0 percent of alcohol amine, 2.5 to 7.0 percent of an anti-rust agent, 1.0 to 5.0 percent of a cosolvent, 0.01 to 0.3 percent of a metal deactivator and 0.01 to 0.2 percent of an anti-foaming agent. The triethanolamine bis (2-ethylhexyl) phosphate ionic liquid, the polymer-based ionic water-based lubricating additive and the trans-block polyether are used as the anti-wear reagent at extreme pressure, and all the components have a good positive synergistic effect, so that the lubricating oil has very excellent anti-wear property at extreme pressure under the condition of a small addition amount; the problem of insufficient lubricating property of the water-based working fluid is solved, the smoothness and precision of a workpiece can be improved, and the service life of a cutter or a machine tool is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of metalworking fluids, and in particular to a water-based fully synthetic cutting fluid and a preparation method and application thereof. Background Art

[0002] Metalworking fluid is a key lubricating material in the high-end bearing manufacturing process. It has many functions such as lubrication, cooling, rust prevention, and cleaning. Its performance has an important impact on the overall quality of metal processing parts. It can improve processing quality and efficiency and reduce energy consumption of processing equipment in mechanical processing. According to the material composition of the product, it can be divided into oil-based metalworking fluid and water-based metalworking fluid. At present, although the existing traditional mineral oil-based metalworking fluid has excellent rust prevention and lubricity, its use is subject to certain restrictions because it may cause a variety of health hazards, such as skin infections, allergies, acute respiratory disorders, etc., and there is a potential risk of fire.

[0003] Water-based metalworking fluids have developed rapidly due to their excellent cooling and cleaning properties, as well as their economic and safety advantages. They are widely used in metal processing fields such as cutting, grinding, rolling, stamping, and tapping. However, the basic component of water-based metalworking fluids is water. Due to the inherent low viscosity and low viscosity-pressure coefficient of water, it is difficult for water-based lubricants to form an efficient lubricating film on the contact area of ​​the friction pair. The friction pair is often in direct contact, so its lubrication performance is far inferior to that of mineral oil. The addition of water-based lubricant additives can significantly improve its physical and chemical properties, film-forming ability, and water-based lubrication performance. Although a variety of water-based lubricant additives (such as anti-wear agents, corrosion inhibitors, and friction modifiers) have been used, water-based lubrication is still difficult to use in harsh working conditions such as high loads and high pressures. Summary of the invention

[0004] In view of this, the purpose of the present invention is to provide a water-based fully synthetic cutting fluid and its preparation method and application. The water-based fully synthetic cutting fluid provided by the present invention has good lubrication performance and extreme pressure and anti-wear performance, and can meet the use requirements of high-load and high-pressure working conditions.

[0005] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0006] The present invention provides a water-based fully synthetic cutting fluid. The raw materials for preparation include, by weight percentage, 52.5-83.48% of water, 3.0-10.0% of extreme pressure anti-wear agent, 10.0-25.0% of alcohol amine, 2.5-7.0% of rust inhibitor, 1.0-5.0% of cosolvent, 0.01-0.3% of metal passivator, and 0.01-0.2% of anti-foaming agent.

[0007] The extreme pressure anti-wear agent comprises triethanolamine di(2-ethylhexyl) phosphate ionic liquid, polymer-based ionic water-based lubricating additive and trans-block polyether;

[0008] The structural formula of the triethanolamine di(2-ethylhexyl) phosphate ionic liquid is shown in Formula 1, and the structural formula of the polymer-based ionic water-based lubricating additive is shown in Formula 2;

[0009]

[0010] In formula 2, m:n=1:(1.5~2).

[0011] Preferably, the mass ratio of the triethanolamine di(2-ethylhexyl) phosphate ionic liquid, the polymer-based ionic water-based lubricating additive and the trans-block polyether is (0.5-1.5):(0.5-1.5):(2-7).

[0012] Preferably, the average molecular weight of the trans-block polyether is 2000-3000 g / mol.

[0013] Preferably, the alcohol amine includes monoethanolamine and triethanolamine; the mass ratio of monoethanolamine to triethanolamine is (5-10):(5-15).

[0014] Preferably, the content of calcium carbonate in the water is no more than 150 mg / L.

[0015] Preferably, the rust inhibitor comprises sebacic acid, dodecanedioic acid and triazine triaminocaproic acid; the mass ratio of sebacic acid, dodecanedioic acid and triazine triaminocaproic acid is (1-2): (1-3): (0.5-2).

[0016] Preferably, the co-solvent is isononanoic acid or isooctanoic acid.

[0017] Preferably, the metal deactivator is benzotriazole or a benzotriazole derivative.

[0018] The present invention provides a method for preparing the water-based fully synthetic cutting fluid described in the above scheme, comprising the following steps: mixing water, alcohol amine, rust inhibitor, extreme pressure anti-wear agent, co-solvent, metal passivator and anti-foaming agent to obtain the water-based fully synthetic cutting fluid.

[0019] The present invention provides the use of the water-based fully synthetic cutting fluid described in the above scheme or the water-based fully synthetic cutting fluid prepared by the preparation method described in the above scheme in ferrous metal cutting or grinding.

[0020] The invention provides a water-based fully synthetic cutting fluid. The preparation raw materials include, by weight percentage, 52.5-83.48% of water, 3.0-10.0% of extreme pressure anti-wear agent, 10.0-25.0% of alcohol amine, 2.5-7.0% of rust inhibitor, 1.0-5.0% of cosolvent, 0.01-0.3% of metal passivator and 0.01-0.2% of anti-foaming agent. The extreme pressure anti-wear agent includes triethanolamine di(2-ethylhexyl) phosphate ionic liquid, polymer-based ionic water-based lubricating additive and trans-block polyether. The present invention adopts triethanolamine di (2-ethylhexyl) phosphate ionic liquid, polymer-based ionic water-based lubricating additive and trans-block polyether as extreme pressure anti-wear agents, and each component has good positive synergistic effect with each other. Compared with the common extreme pressure anti-wear agents (such as phosphate esters and chlorinated paraffin) in traditional fully synthetic cutting fluids, the present invention has very excellent extreme pressure anti-wear performance under a smaller additive dosage, solves the problem of insufficient lubrication performance of water-based machining fluids, can improve the finish and precision of machined parts, and prolong the service life of cutting tools or machine tools. The present invention introduces multiple functional additives such as extreme pressure anti-wear agents, alcohol amines, rust inhibitors, cosolvents, metal passivators and anti-foaming agents, and there are extremely complex interactions between different additives. The present invention controls the type and addition amount of each additive, so that the cutting fluid has excellent extreme pressure anti-wear performance (maximum no-seizure load is greater than 600N), friction reduction performance (friction coefficient is less than 0.13) and rust prevention performance, and has good storage stability, cleaning performance and anti-foaming performance.

[0021] Furthermore, the present invention simultaneously uses monoethanolamine and triethanolamine as the alcohol amine components, which can not only increase the pH value of the cutting fluid, but also provide sufficient reserve alkali to prevent the pH value of the cutting fluid from decreasing too quickly and becoming ineffective.

[0022] The fully synthetic cutting fluid provided by the invention does not contain chlorine, formaldehyde, heavy metals, boron, sodium nitrite, secondary amines, phenol, etc., is green and environmentally friendly, can be used for lubrication in the process of ferrous metal cutting or grinding, has reasonable raw material compatibility, simple preparation method, and wide application range. DETAILED DESCRIPTION

[0023] The present invention provides a water-based fully synthetic cutting fluid. The raw materials for preparation include, by weight percentage, 52.5-83.48% of water, 3.0-10.0% of extreme pressure anti-wear agent, 10.0-25.0% of alcohol amine, 2.5-7.0% of rust inhibitor, 1.0-5.0% of cosolvent, 0.01-0.3% of metal passivator, and 0.01-0.2% of anti-foaming agent.

[0024] The extreme pressure anti-wear agent comprises triethanolamine di(2-ethylhexyl) phosphate ionic liquid, polymer-based ionic water-based lubricating additive and trans-block polyether;

[0025] The structural formula of the triethanolamine di(2-ethylhexyl) phosphate ionic liquid is shown in Formula 1, and the structural formula of the polymer-based ionic water-based lubricating additive is shown in Formula 2;

[0026]

[0027] In formula 2, m:n=1:(1.5~2).

[0028] In the present invention, unless otherwise specified, the raw materials used are commercially available products well known in the art.

[0029] In terms of weight percentage, the raw materials for preparing the water-based fully synthetic cutting fluid provided by the present invention include 52.5-83.48% water, and in specific embodiments, it can be 52.5%, 55%, 60%, 65%, 70%, 75%, 80% or 83.48%. In the present invention, the water is preferably softened water, wherein the content of calcium carbonate is preferably not more than 150 mg / L, more preferably not more than 100 mg / L, and further preferably not more than 50 mg / L. The use of softened water in the present invention is conducive to improving the stability and rust resistance of the water-based fully synthetic cutting fluid.

[0030] In terms of weight percentage, the raw materials for preparing the water-based fully synthetic cutting fluid provided by the present invention include 3.0-10.0% of extreme pressure anti-wear agent, and in specific embodiments, it can be 3.0%, 4.0%, 5.0%, 6.0%, 7.0%, 8.0%, 9.0% or 10.0%. In the present invention, the extreme pressure anti-wear agent includes triethanolamine di (2-ethylhexyl) phosphate ionic liquid, polymer-based ionic water-based lubricating additive and trans-block polyether; the mass ratio of the triethanolamine di (2-ethylhexyl) phosphate ionic liquid, polymer-based ionic water-based lubricating additive and trans-block polyether is preferably (0.5-1.5): (0.5-1.5): (2-7), more preferably 1:1: (3-5), and in specific embodiments, it can be 0.5:0.5:2, 1.5:1.5:7 or 1:1:3.5.

[0031] In the present invention, the triethanolamine di (2-ethylhexyl) phosphate ionic liquid is preferably prepared by a method well known to those skilled in the art. In a specific embodiment, it is prepared by referring to the method of Example 1 of "CN201910485664.4 A triethanolamine di (2-ethylhexyl) phosphate ionic liquid and its preparation method and application as a water-based lubricant additive". The present invention does not specifically limit the source of the polymer-based ionic water-based lubricant additive, and it can be prepared by a method well known to those skilled in the art. In a specific embodiment, it is prepared by referring to the method of Example 1 in "CN202210559540.8 A polymer-based ionic water-based lubricant additive and its preparation method and application". In the present invention, the average molecular weight of the trans-block polyether is preferably 2000-3000 g / mol, and in a specific embodiment, it can be 2000 g / mol, 2300 g / mol, 2500 g / mol, 2700 g / mol or 3000 g / mol. In an embodiment of the present invention, the trans-block polyether is preferably GENAPOL RPF 1720 from Clariant, with a molecular weight of about 2200 g / mol.

[0032] The invention adopts triethanolamine di(2-ethylhexyl) phosphate ionic liquid, polymer-based ionic water-based lubricating additive and trans-block polyether as extreme pressure anti-wear agents, and the components have good positive synergistic effect with each other. Compared with the extreme pressure anti-wear agents commonly used in traditional fully synthetic cutting fluids, the invention has very excellent extreme pressure anti-wear performance under a smaller additive dosage, solves the problem of insufficient lubrication performance of water-based machining fluids, can improve the finish and precision of machined parts, and prolong the service life of cutting tools or machine tools.

[0033] In terms of weight percentage, the raw materials for preparing the water-based fully synthetic cutting fluid provided by the present invention include 10.0-25.0% of alcohol amine, and in specific embodiments, it can be 10.0%, 12.0%, 14.0%, 16.0%, 18.0%, 20.0%, 22.0% or 25.0%. In the present invention, the alcohol amine preferably includes monoethanolamine and triethanolamine, and the mass ratio of the monoethanolamine and triethanolamine is preferably (5-10): (5-15), more preferably 5: (5-8), and in specific embodiments, it can be 5: 5, 10: 15 or 7.5: 8.5. In the present invention, the monoethanolamine is preferably MEA of Dow; the triethanolamine is preferably TEA of Dow. The present invention uses monoethanolamine and triethanolamine as alcohol amine components, which can not only increase the pH value of the cutting fluid, but also provide sufficient reserve alkali to prevent the pH value of the cutting fluid from decreasing too quickly and becoming ineffective.

[0034] In terms of weight percentage, the raw materials for preparing the water-based fully synthetic cutting fluid provided by the present invention include 2.5-7.0% of rust inhibitor, and in specific embodiments, it can be 2.5%, 3.0%, 4.0%, 5.0%, 6.0% or 7.0%. In the present invention, the rust inhibitor preferably includes sebacic acid, dodecane dibasic acid and triazine triaminocaproic acid, and the mass ratio of sebacic acid, dodecane dibasic acid and triazine triaminocaproic acid is preferably (1-2): (1-3): (0.5-2), more preferably 1: (1-2): (0.5-1), and in specific embodiments, it can be 1:1:0.5, 2:3:2, 1:2:1. In the present invention, the sebacic acid is preferably the sebacic acid of Tianjin Zuanquan Technology Development Co., Ltd., the dodecane dibasic acid is preferably the dodecane dibasic acid of Tianjin Zuanquan Technology Development Co., Ltd., and the triazine triaminocaproic acid is preferably IRGACOR L190 PLUS of BASF. The present invention adopts sebacic acid, dodecanedioic acid and triazine triaminocaproic acid as rust inhibitors. Different components work synergistically to make the cutting fluid have excellent rust and corrosion resistance and auxiliary foam suppression and sterilization performance.

[0035] In terms of weight percentage, the raw materials for preparing the water-based fully synthetic cutting fluid provided by the present invention include 1.0-5.0% of a cosolvent, which can be 1.0%, 2.0%, 3.0%, 4.0% or 5.0% in a specific embodiment. In the present invention, the cosolvent is preferably isononanoic acid or isooctanoic acid. In the present invention, the isononanoic acid is preferably Isononanoic Acid from OQ Company of Germany. The present invention preferably uses isononanoic acid or isooctanoic acid as a cosolvent, which can solubilize various additives, improve the high and low temperature stability of the cutting fluid, and has good compatibility with other additives.

[0036] In terms of weight percentage, the raw materials for preparing the water-based fully synthetic cutting fluid provided by the present invention include 0.01-0.3% of a metal passivator, and in specific embodiments, it can be 0.01%, 0.05%, 0.1%, 0.15%, 0.2%, 0.25% or 0.3%. In the present invention, the metal passivator is preferably benzotriazole or a benzotriazole derivative. In the present invention, the benzotriazole derivative is preferably IRGAMET 42 of BASF. The present invention preferably uses a benzotriazole derivative or benzotriazole as a metal passivator, which can provide anti-corrosion protection for non-ferrous metals, and at the same time has certain lubricating properties, and has good compatibility with other additives.

[0037] In terms of weight percentage, the raw materials for preparing the water-based fully synthetic cutting fluid provided by the present invention include 0.01-0.2% antifoaming agent, which can be 0.01%, 0.05%, 0.1%, 0.15% or 0.2% in specific embodiments. In the present invention, the antifoaming agent is preferably a composite antifoaming agent. In the present invention, the composite antifoaming agent is preferably DF30 of Sinopec. The present invention limits the amount of the antifoaming agent to the above range, which can maintain certain foam properties. Eliminating the foam in the cutting fluid can improve the working effect of the cutting fluid, reduce vibration and noise during the cutting process, and extend the service life of the tool. However, if the antifoaming agent is used too much, it may cause the performance of the cutting fluid to decline, and even have a negative impact on mechanical processing.

[0038] In the present invention, the pH value of the 5% dilution of the water-based fully synthetic cutting fluid is preferably 8.0 to 10.0, and more preferably 8.5 to 9.7. In the present invention, the 5% dilution refers to diluting the water-based fully synthetic cutting fluid with water (in the specific performance test, the water-based fully synthetic cutting fluid is diluted with softened water), and the mass proportion of the water-based fully synthetic cutting fluid in the dilution is 5%.

[0039] The present invention provides a method for preparing the water-based fully synthetic cutting fluid described in the above scheme, comprising the following steps: mixing water, alcohol amine, rust inhibitor, extreme pressure anti-wear agent, co-solvent, metal passivator and anti-foaming agent to obtain the water-based fully synthetic cutting fluid.

[0040] The present invention preferably adds alcohol amine to water at 30-50°C and under stirring conditions, then adds rust inhibitor, after acid-base reaction for 1-3 hours, cools to room temperature, then adds extreme pressure anti-wear agent, cosolvent, metal passivator and anti-foaming agent, stirs for 1-3 hours until the obtained mixture is uniform and transparent, and obtains the water-based fully synthetic cutting fluid after cooling. In an embodiment of the present invention, the mixing is preferably carried out in a stainless steel blending kettle with a stirrer.

[0041] The present invention provides the use of the water-based fully synthetic cutting fluid described in the above scheme or the water-based fully synthetic cutting fluid prepared by the preparation method described in the above scheme in ferrous metal cutting or grinding.

[0042] The water-based fully synthetic cutting fluid provided by the present invention, its preparation method and application are described in detail below in conjunction with the embodiments, but they should not be construed as limiting the scope of protection of the present invention.

[0043] Some of the raw materials involved in the following examples and comparative examples include:

[0044] Monoethanolamine is MEA from Dow;

[0045] Triethanolamine was TEA from Dow;

[0046] Sebacic acid was obtained from Tianjin Zuanquan Technology Development Co., Ltd.

[0047] Dodecanedioic acid is the dodecanedioic acid from Tianjin Zuanquan Technology Development Co., Ltd.;

[0048] Triazine triaminocaproic acid is IRGACOR L190 PLUS from BASF;

[0049] Isononanoic acid was obtained from OQ, Germany;

[0050] The benzotriazole derivative was IRGAMET 42 from BASF;

[0051] The composite antifoaming agent is DF30 produced by Sinopec.

[0052] Example 1

[0053] Weigh 83.48g of softened water (the content of calcium carbonate is not more than 50mg / L), stir, add 5.0g of monoethanolamine and 5.0g of triethanolamine, stir to fully dissolve, then add 1.0g of sebacic acid, 1.0g of dodecanedioic acid, 0.5g of triazine triaminocaproic acid, stir at 35±5℃ for 1.5h, cool to room temperature, add 0.5g of triethanolamine di(2-ethylhexyl) phosphate ionic liquid, 0.5g of polymer-based ionic water-based lubricating additive, 2.0g of trans-block polyether, 1.0g of isononanoic acid, 0.01g of benzotriazole derivative, 0.01g of composite antifoaming agent, stir for 2h to fully mix until the mixture is uniform and transparent, and obtain a water-based fully synthetic cutting fluid after cooling.

[0054] Example 2

[0055] Weigh 52.5g of softened water (the content of calcium carbonate is not more than 50mg / L), stir, add 10.0g of monoethanolamine and 15.0g of triethanolamine, stir to fully dissolve, then add 2.0g of sebacic acid, 3.0g of dodecanedioic acid, 2.0g of triazine triaminocaproic acid, stir at 35±5℃ for 1.5h, cool to room temperature, add 1.5g of triethanolamine di(2-ethylhexyl) phosphate ionic liquid, 1.5g of polymer-based ionic water-based lubricating additive, 7.0g of trans-block polyether, 5.0g of isononanoic acid, 0.3g of benzotriazole derivative, 0.2g of composite antifoaming agent, stir for 2h to fully mix until the mixture is uniform and transparent, and obtain a water-based fully synthetic cutting fluid after cooling.

[0056] Example 3

[0057] Weigh 71.2g of softened water (the content of calcium carbonate is not more than 50mg / L), stir, add 7.5g of monoethanolamine and 8.5g of triethanolamine, stir to fully dissolve, then add 1.0g of sebacic acid, 2.0g of dodecanedioic acid, 1.0g of triazine triaminocaproic acid, stir at 35±5℃ for 1.5h, cool to room temperature, add 1.0g of triethanolamine di(2-ethylhexyl) phosphate ionic liquid, 1.0g of polymer-based ionic water-based lubricating additive, 3.5g of trans-block polyether, 3.0g of isononanoic acid, 0.2g of benzotriazole derivative, 0.1g of composite antifoaming agent, stir for 2h to fully mix until the mixture is uniform and transparent, and obtain a water-based fully synthetic cutting fluid after cooling.

[0058] Comparative Example 1

[0059] A fully synthetic cutting fluid was prepared according to Example 3, except that 1.0 g of triethanolamine di(2-ethylhexyl) phosphate ionic liquid, 1.0 g of polymer-based ionic water-based lubricating additive and 3.5 g of trans-block polyether were replaced with 1.5 g of polymer-based ionic water-based lubricating additive and 4.0 g of trans-block polyether.

[0060] Comparative Example 2

[0061] A fully synthetic cutting fluid was prepared according to Example 3, except that 1.0 g of triethanolamine di(2-ethylhexyl) phosphate ionic liquid, 1.0 g of polymer-based ionic water-based lubricating additive and 3.5 g of trans-block polyether were replaced with 5.5 g of trans-block polyether.

[0062] The performance of the water-based fully synthetic cutting fluids prepared in the examples and comparative examples was tested, and the results are shown in Table 1.

[0063] Table 1 Performance test results of water-based fully synthetic cutting fluids prepared in Examples and Comparative Examples

[0064]

[0065] As shown in Table 1, the fully synthetic cutting fluid provided by the present invention has excellent extreme pressure anti-wear performance (maximum non-seizure load greater than 600N), friction reduction performance (friction coefficient less than 0.13) and rust prevention performance, and has good storage stability, cleaning performance and anti-foaming performance. At the same time, compared with Comparative Examples 1 and 2, the fully synthetic cutting fluid prepared in Example 3 has excellent extreme pressure anti-wear performance and friction reduction performance, indicating that the present invention uses triethanolamine di (2-ethylhexyl) phosphate ionic liquid, polymer-based ionic water-based lubricating additives and trans-block polyethers to produce a good positive synergistic effect, which is beneficial to improving the tribological properties of lubricating oil, solving the problem of insufficient lubrication performance of water-based machining fluids, and can improve the finish and precision of workpieces, and extend the service life of tools or machine tools.

[0066] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A water-based fully synthetic cutting fluid, characterized in that: The raw materials for preparation include, by weight percentage, 52.5-83.48% of water, 3.0-10.0% of extreme pressure anti-wear agent, 10.0-25.0% of alcohol amine, 2.5-7.0% of rust inhibitor, 1.0-5.0% of cosolvent, 0.01-0.3% of metal passivator, and 0.01-0.2% of anti-foaming agent; The extreme pressure anti-wear agent comprises triethanolamine di(2-ethylhexyl) phosphate ionic liquid, polymer-based ionic water-based lubricating additive and trans-block polyether; The structural formula of the triethanolamine di(2-ethylhexyl) phosphate ionic liquid is shown in Formula 1, and the structural formula of the polymer-based ionic water-based lubricating additive is shown in Formula 2; In formula 2, m:n=1:(1.5~2).

2. The water-based fully synthetic cutting fluid according to claim 1, characterized in that: The mass ratio of the triethanolamine di(2-ethylhexyl)phosphate ionic liquid, the polymer-based ionic water-based lubricating additive and the trans-block polyether is (0.5-1.5):(0.5-1.5):(2-7).

3. The water-based fully synthetic cutting fluid according to claim 1 or 2, characterized in that: The average molecular weight of the trans-block polyether is 2000-3000 g / mol.

4. The water-based fully synthetic cutting fluid according to claim 1, characterized in that: The alcohol amines include monoethanolamine and triethanolamine; the mass ratio of the monoethanolamine to the triethanolamine is (5-10):(5-15).

5. The water-based fully synthetic cutting fluid according to claim 1, characterized in that: The content of calcium carbonate in the water is not more than 150 mg / L.

6. The water-based fully synthetic cutting fluid according to claim 1, characterized in that: The rust inhibitor comprises sebacic acid, dodecanedioic acid and triazine triaminocaproic acid; the mass ratio of sebacic acid, dodecanedioic acid and triazine triaminocaproic acid is (1-2): (1-3): (0.5-2).

7. The water-based fully synthetic cutting fluid according to claim 1, characterized in that: The cosolvent is isononanoic acid or isooctanoic acid.

8. The water-based fully synthetic cutting fluid according to claim 1, characterized in that: The metal deactivator is benzotriazole or a benzotriazole derivative.

9. The method for preparing the water-based fully synthetic cutting fluid according to any one of claims 1 to 8, comprising the following steps: The water-based fully synthetic cutting fluid is obtained by mixing water, alcohol amine, rust inhibitor, extreme pressure anti-wear agent, co-solvent, metal passivator and anti-foaming agent.

10. Use of the water-based fully synthetic cutting fluid according to any one of claims 1 to 8 or the water-based fully synthetic cutting fluid prepared by the preparation method according to claim 9 in ferrous metal cutting or grinding.

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