Environmentally friendly and degradable cutting fluid and preparation method thereof

Abstract

The present application relates to the field of cutting fluids, and in particular to an environmentally friendly and degradable cutting fluid and its preparation method. An environmentally friendly and degradable cutting fluid comprises the following substances in parts by weight: 25 to 40 parts of vegetable oil; 10 to 30 parts of emulsifier; 12 to 20 parts of lubricant; 15 to 25 parts of rust inhibitor; 0.1 to 1.0 parts of defoamer; 10 to 40 parts of water; the lubricant is nanoporous carbon / molybdenum composite particles. The present application selects nanoporous carbon / molybdenum composite particles as the main lubricating particles, because nanoporous carbon / molybdenum composite particles can effectively improve the bonding performance between carbon and molybdenum, and improve the phenomenon of the two agglomerating after simple addition of traditional additives; on this basis, because the composite particles can enter the contact area of the friction pair and form a lubricating film, friction and wear are reduced. At the same time, the friction-active nanoparticles have a high shear strength, which is conducive to improving the load-bearing capacity of the lubricating film.

Description

Technical Field

[0001] The present application relates to the field of cutting fluids, and in particular to an environmentally friendly and degradable cutting fluid and a preparation method thereof. Background Art

[0002] Metal cutting is the process of removing (or grinding) excess metal from a workpiece using a cutting tool (or grinding tool) powered by a machine tool, thereby obtaining a workpiece that meets the required surface quality, machining accuracy, and shape. Metal cutting fluids are used to cool, lubricate, clean, and prevent rust during the metal cutting process. Cutting fluids can be divided into two categories based on their composition: oil-based cutting fluids and water-based cutting fluids. Oil-based cutting fluids include animal and vegetable oils, mineral oils, extreme pressure cutting fluids, and conventional composite cutting fluids; water-based cutting fluids include emulsified cutting fluids, semi-synthetic cutting fluids, and fully synthetic cutting fluids.

[0003] Currently, most cutting fluids contain difficult-to-degrade mineral oils and carcinogenic nitrite additives, polluting the environment and harming human health. They also have a pungent odor, are prone to spoilage, and have a short service life. Therefore, environmentally friendly water-based cutting fluids are now the most common cutting fluid products.

[0004] In view of the above-mentioned related technologies, the inventors found that although the existing environmentally friendly water-based cutting fluid has good cooling and cleaning performance, its anti-rust and lubrication properties are poor, which reduces the cutting effect of the environmentally friendly water-based cutting fluid. Summary of the Invention

[0005] In order to improve the defects of existing environmentally friendly water-based cutting fluids in terms of poor rust prevention and lubrication performance, the present application provides an environmentally friendly and degradable cutting fluid and a preparation method thereof.

[0006] This application provides an environmentally friendly and biodegradable cutting fluid, which adopts the following technical solutions:

[0007] An environmentally friendly and biodegradable cutting fluid comprises the following substances in parts by weight:

[0008]

[0009] The lubricant is nanoporous carbon / molybdenum composite particles.

[0010] Through the above technical solution, this application uses nanoporous carbon / molybdenum composite particles as the primary lubricating particles. This nanoporous carbon / molybdenum composite particle effectively improves the bonding between carbon and molybdenum, reversing the agglomeration of the two after simple addition of traditional additives. Furthermore, the composite particles can enter the contact area of the friction pair and form a lubricating film, thereby reducing friction and wear. Furthermore, the triboactive nanoparticles possess high shear strength, which helps improve the load-bearing capacity of the lubricating film.

[0011] Preferably, the nanoporous carbon / molybdenum composite particles are prepared by the following scheme:

[0012] Add polyvinyl alcohol to DMF, stir and mix, add ferric acetylacetonate and phosphoric acid solution, stir and mix, and collect the mixture;

[0013] The mixed liquid is spray-dried, and the dried particles are collected and placed in a tube furnace. The temperature is first raised to 250-280°C and kept warm, and then carbonized to obtain intermediate particles.

[0014] Sodium molybdate and thiourea are mixed and placed in deionized water, intermediate particles are added and placed in a reaction device, heat-treated at 175-200° C., etched with nitric acid, washed and dried, ground and sieved to prepare the nanoporous carbon / molybdenum composite particles.

[0015] Through the above technical solution, the present application compounds porous carbon and molybdenum, which can expand its application range in the field of lubrication and give full play to the excellent performance of the composite nanoparticles.

[0016] Finally, since the molybdenum-containing particles have a two-dimensional layered structure, their molecules have weak interlayer van der Waals forces and strong intralayer covalent bonds, and have strong lubrication ability. While effectively improving its lubrication performance, it is loaded into the interior of the porous carbon material to form a stable dispersed structure, further improving the stability of the environmentally friendly and degradable cutting fluid.

[0017] Preferably, the rust inhibitor comprises the following substances in parts by weight:

[0018] 35-50 parts of sodium silicate;

[0019] 6-12 parts of triethanolamine;

[0020] 3 to 5 parts of boric acid.

[0021] Through the above technical solution, the present application optimizes the components of the corrosion inhibitor and selects the polar group carboxyl in the water-soluble rust inhibitor molecule to be easily adsorbed on the metal surface, while the hydrophobic hydrocarbon group forms a protective film on the metal surface to prevent moisture from corroding the metal surface, thereby achieving an anti-rust effect.

[0022] Preferably, the rust inhibitor further comprises 3 to 10 parts by weight of graphene-tall oil fatty acid ester.

[0023] Through the above technical solution, the present application further optimizes the rust inhibitor material components. By selecting fatty acid esters as rust inhibitors, on the one hand, tall oil fatty acid esters are environmentally friendly and the addition amount is moderate, which meets the requirements of environmentally friendly cutting fluid components; on the other hand, tall oil fatty acid esters are combined with graphene to improve the lubrication properties of low-sulfur diesel, reduce the wear scar diameter and friction coefficient, and form a good coating layer structure on the metal surface, thereby increasing the contact area between the metal and the air after cutting, thereby further improving its rust prevention and lubrication properties.

[0024] Preferably, the graphene is alkylated modified graphene.

[0025] Through the above technical solution, the present application improves the stability and dispersibility of the graphene material after mixing with tall oil fatty acid ester by alkylation, so that after adding it to the cutting fluid, it has good cutting stability performance.

[0026] In a second aspect, the present application provides a method for preparing an environmentally friendly and biodegradable cutting fluid, comprising the following preparation steps:

[0027] First, mix the vegetable oil, lubricant and rust inhibitor and collect the first mixed liquid;

[0028] Then, deionized water and defoaming agent were added and stirred to obtain a second mixed solution;

[0029] The environmentally friendly and degradable cutting fluid is prepared by mixing the first mixed liquid and the second mixed liquid, adding an emulsifier, stirring and mixing, and then subjecting the mixture to ultrasonic oscillation.

[0030] Through the above technical solution, the present application distinguishes the oil phase and the water phase and mixes them separately, thereby improving the stability of the emulsion formed by the prepared cutting fluid, thereby further improving the rust prevention and lubrication properties of the environmentally friendly water-based cutting fluid.

[0031] In summary, this application has the following beneficial effects:

[0032] First, this application uses nanoporous carbon / molybdenum composite particles as the primary lubricating particles. This is because the nanoporous carbon / molybdenum composite particles effectively improve the bonding between carbon and molybdenum, reducing the agglomeration of the two after simple addition of traditional additives. Furthermore, the composite particles can penetrate the contact area of the friction pair and form a lubricating film, thereby reducing friction and wear. Furthermore, the triboactive nanoparticles possess high shear strength, which helps improve the load-bearing capacity of the lubricating film.

[0033] Second, the present application compounds porous carbon and molybdenum, which can expand its application range in the field of lubrication and give full play to the excellent performance of the composite nanoparticles.

[0034] Finally, since the molybdenum-containing particles have a two-dimensional layered structure, their molecules have weak interlayer van der Waals forces and strong intralayer covalent bonds, and have strong lubrication ability. While effectively improving its lubrication performance, it is loaded into the interior of the porous carbon material to form a stable dispersed structure, further improving the stability of the environmentally friendly and degradable cutting fluid.

[0035] Third, the present application further optimizes the rust inhibitor material components by selecting fatty acid esters as rust inhibitors. On the one hand, tall oil fatty acid esters are environmentally friendly and the addition amount is moderate, which meets the requirements of environmentally friendly cutting fluid components. On the other hand, tall oil fatty acid esters are combined with graphene to improve the lubrication properties of low-sulfur diesel, reduce the wear scar diameter and friction coefficient, and form a good coating layer structure on the metal surface, thereby increasing the contact area between the metal and the air after cutting, thereby further improving its rust prevention and lubrication properties. DETAILED DESCRIPTION

[0036] In order to further understand the present invention, preferred embodiments of the present invention are described below in conjunction with examples. However, it should be understood that these descriptions are only for further illustrating the features and advantages of the present invention, rather than for limiting the claims of the invention.

[0037] All raw materials of the present invention are not particularly limited in their sources and can be purchased from the market or prepared according to conventional methods well known to those skilled in the art.

[0038] All raw materials of the present invention, their brands and abbreviations are conventional brands and abbreviations in the field. Each brand and abbreviation is clear and unambiguous in the field of its relevant use. Those skilled in the art can purchase them from the market or prepare them by conventional methods based on the brand, abbreviation and corresponding use.

[0039] The abbreviations of all processes of the present invention are conventional abbreviations in the field. Each abbreviation is clear and unambiguous in the field of its relevant use. Those skilled in the art can understand its conventional process steps based on the abbreviations.

[0040] Preparation Example

[0041] Preparation Example 1: Nanoporous carbon / molybdenum composite particles 1

[0042] 1000 g of polyvinyl alcohol was added to 10 L of DMF, stirred and mixed, and 700 g of ferric acetylacetonate and 2000 mL of 10% phosphoric acid solution were added, stirred and mixed, and the mixture was collected;

[0043] The mixed liquid is spray-dried, and the dried particles are collected and placed in a tube furnace. The temperature is first raised to 250°C for insulation treatment, and then raised to 650°C for carbonization treatment to obtain intermediate particles.

[0044] 750 g of sodium molybdate and 900 g of thiourea were mixed and placed in 5 L of deionized water, 800 g of the intermediate particles were added and placed in a reaction device, and after heat treatment at 175° C., the mixture was etched with 45% nitric acid by mass, washed with deionized water, dried at 45° C., ground and sieved to obtain the nanoporous carbon / molybdenum composite particles.

[0045] Preparation Example 2: Nanoporous Carbon / Molybdenum Composite Particles 2

[0046] 1150 g of polyvinyl alcohol was added to 12 L of DMF, stirred and mixed, and 850 g of ferric acetylacetonate and 2250 mL of 10% by mass phosphoric acid solution were added, stirred and mixed, and the mixture was collected;

[0047] The mixed liquid is spray-dried, and the dried particles are collected and placed in a tube furnace. The temperature is first raised to 265°C for insulation treatment, and then raised to 675°C for carbonization treatment to obtain intermediate particles.

[0048] 775 g of sodium molybdate and 950 g of thiourea were mixed and placed in 5.5 L of deionized water, 900 g of the intermediate particles were added and placed in a reaction device, and after heat treatment at 190° C., the mixture was etched with 45% nitric acid by mass, washed with deionized water, dried at 52° C., ground and sieved to obtain the nanoporous carbon / molybdenum composite particles.

[0049] Preparation Example 3: Nanoporous Carbon / Molybdenum Composite Particles 3

[0050] 1250 g of polyvinyl alcohol was added to 15 L of DMF, and the mixture was stirred and mixed. 1000 g of ferric acetylacetonate and 2500 mL of 10% phosphoric acid solution were added, and the mixture was stirred and mixed.

[0051] The mixed liquid is spray-dried, and the dried particles are collected and placed in a tube furnace. The temperature is first raised to 280°C and then kept warm. The temperature is then raised to 700°C and carbonized to obtain intermediate particles.

[0052] 800 g of sodium molybdate and 1000 g of thiourea were mixed and placed in 6 L of deionized water, 1000 g of the intermediate particles were added and placed in a reaction device, and after heat treatment at 200° C., the mixture was etched with 45% nitric acid by mass, washed with deionized water, dried at 60° C., ground and sieved to obtain the nanoporous carbon / molybdenum composite particles.

[0053] Preparation Example 4: Rust Inhibitor 1

[0054] 35 kg of sodium silicate, 6 kg of triethanolamine and 3 kg of boric acid were mixed and stirred to prepare a rust inhibitor 1.

[0055] Preparation Example 5: Rust Inhibitor 2

[0056] 42 kg of sodium silicate, 9 kg of triethanolamine and 4 kg of boric acid were mixed and stirred to prepare a rust inhibitor 2.

[0057] Preparation Example 6: Rust Inhibitor 3

[0058] 50 kg of sodium silicate, 12 kg of triethanolamine and 5 kg of boric acid were mixed and stirred to prepare a rust inhibitor 3.

[0059] Preparation Example 7: Rust Inhibitor 4

[0060] 50 kg of sodium silicate, 12 kg of triethanolamine, 5 kg of boric acid and 3 kg of graphene-tall oil fatty acid ester were stirred and mixed to prepare a rust inhibitor 4.

[0061] Preparation Example 8: Rust Inhibitor 5

[0062] 50 kg of sodium silicate, 12 kg of triethanolamine, 5 kg of boric acid and 6 kg of graphene-tall oil fatty acid ester were mixed and stirred to prepare a rust inhibitor 5.

[0063] Preparation Example 9: Rust Inhibitor 6

[0064] 50 kg of sodium silicate, 12 kg of triethanolamine, 5 kg of boric acid and 10 kg of alkylated modified graphene-tall oil fatty acid ester were stirred and mixed to prepare a rust inhibitor 6.

[0065] Example

[0066] Example 1

[0067] An environmentally friendly and biodegradable cutting fluid comprises the following substances: 25 kg of vegetable oil, 10 kg of emulsifier nonylphenol polyoxyethylene ether, 12 kg of lubricant nanoporous carbon / molybdenum composite particles 1, 15 kg of rust inhibitor 1, 0.1 kg of defoaming agent and 10 kg of water.

[0068] A method for preparing an environmentally friendly and biodegradable cutting fluid comprises the following steps:

[0069] First, mix the vegetable oil, lubricant and rust inhibitor and collect the first mixed liquid;

[0070] Then, deionized water and defoaming agent were added and stirred to obtain a second mixed solution;

[0071] The environmentally friendly and degradable cutting fluid is prepared by mixing the first mixed liquid and the second mixed liquid, adding an emulsifier, stirring and mixing, and then subjecting the mixture to ultrasonic oscillation at 300W.

[0072] Example 2

[0073] An environmentally friendly and biodegradable cutting fluid comprises the following substances: 32 kg of vegetable oil, 20 kg of emulsifier nonylphenol polyoxyethylene ether, 16 kg of lubricant nanoporous carbon / molybdenum composite particles 1, 20 kg of rust inhibitor 1, 0.5 kg of defoaming agent and 35 kg of water.

[0074] A method for preparing an environmentally friendly and biodegradable cutting fluid comprises the following steps:

[0075] First, mix the vegetable oil, lubricant and rust inhibitor and collect the first mixed liquid;

[0076] Then, deionized water and defoaming agent were added and stirred to obtain a second mixed solution;

[0077] The environmentally friendly and degradable cutting fluid is prepared by mixing the first mixed liquid and the second mixed liquid, adding an emulsifier, stirring and mixing, and then subjecting the mixture to ultrasonic oscillation at 300W.

[0078] Example 3

[0079] An environmentally friendly and biodegradable cutting fluid comprises the following substances: 40 kg of vegetable oil, 30 kg of emulsifier nonylphenol polyoxyethylene ether, 20 kg of lubricant nanoporous carbon / molybdenum composite particles 1, 25 kg of rust inhibitor 1, 1.0 kg of defoaming agent and 40 kg of water.

[0080] A method for preparing an environmentally friendly and biodegradable cutting fluid comprises the following steps:

[0081] First, mix the vegetable oil, lubricant and rust inhibitor and collect the first mixed liquid;

[0082] Then, deionized water and defoaming agent were added and stirred to obtain a second mixed solution;

[0083] The environmentally friendly and degradable cutting fluid is prepared by mixing the first mixed liquid and the second mixed liquid, adding an emulsifier, stirring and mixing, and then subjecting the mixture to ultrasonic oscillation at 300W.

[0084] Example 4

[0085] An environmentally friendly and biodegradable cutting fluid comprises the following substances: 25 kg of vegetable oil, 10 kg of emulsifier nonylphenol polyoxyethylene ether, 12 kg of lubricant nanoporous carbon / molybdenum composite particles 2, 15 kg of rust inhibitor 1, 0.1 kg of defoaming agent and 10 kg of water.

[0086] A method for preparing an environmentally friendly and biodegradable cutting fluid comprises the following steps:

[0087] First, mix the vegetable oil, lubricant and rust inhibitor and collect the first mixed liquid;

[0088] Then, deionized water and defoaming agent were added and stirred to obtain a second mixed solution;

[0089] The environmentally friendly and degradable cutting fluid is prepared by mixing the first mixed liquid and the second mixed liquid, adding an emulsifier, stirring and mixing, and then subjecting the mixture to ultrasonic oscillation at 300W.

[0090] Example 5

[0091] An environmentally friendly and biodegradable cutting fluid comprises the following substances: 25 kg of vegetable oil, 10 kg of emulsifier nonylphenol polyoxyethylene ether, 12 kg of lubricant nanoporous carbon / molybdenum composite particles 3, 15 kg of rust inhibitor 1, 0.1 kg of defoaming agent and 10 kg of water.

[0092] A method for preparing an environmentally friendly and biodegradable cutting fluid comprises the following steps:

[0093] First, mix the vegetable oil, lubricant and rust inhibitor and collect the first mixed liquid;

[0094] Then, deionized water and defoaming agent were added and stirred to obtain a second mixed solution;

[0095] The environmentally friendly and degradable cutting fluid is prepared by mixing the first mixed liquid and the second mixed liquid, adding an emulsifier, stirring and mixing, and then subjecting the mixture to ultrasonic oscillation at 300W.

[0096] Example 6

[0097] An environmentally friendly and biodegradable cutting fluid comprises the following substances: 25 kg of vegetable oil, 10 kg of emulsifier nonylphenol polyoxyethylene ether, 12 kg of lubricant nanoporous carbon / molybdenum composite particles 1, 15 kg of rust inhibitor 2, 0.1 kg of defoaming agent and 10 kg of water.

[0098] A method for preparing an environmentally friendly and biodegradable cutting fluid comprises the following steps:

[0099] First, mix the vegetable oil, lubricant and rust inhibitor and collect the first mixed liquid;

[0100] Then, deionized water and defoaming agent were added and stirred to obtain a second mixed solution;

[0101] The environmentally friendly and degradable cutting fluid is prepared by mixing the first mixed liquid and the second mixed liquid, adding an emulsifier, stirring and mixing, and then subjecting the mixture to ultrasonic oscillation at 300W.

[0102] Example 7

[0103] An environmentally friendly and biodegradable cutting fluid comprises the following substances: 25 kg of vegetable oil, 10 kg of emulsifier nonylphenol polyoxyethylene ether, 12 kg of lubricant nanoporous carbon / molybdenum composite particles 1, 15 kg of rust inhibitor 3, 0.1 kg of defoaming agent and 10 kg of water.

[0104] A method for preparing an environmentally friendly and biodegradable cutting fluid comprises the following steps:

[0105] First, mix the vegetable oil, lubricant and rust inhibitor and collect the first mixed liquid;

[0106] Then, deionized water and defoaming agent were added and stirred to obtain a second mixed solution;

[0107] The environmentally friendly and degradable cutting fluid is prepared by mixing the first mixed liquid and the second mixed liquid, adding an emulsifier, stirring and mixing, and then subjecting the mixture to ultrasonic oscillation at 300W.

[0108] Example 8

[0109] An environmentally friendly and biodegradable cutting fluid comprises the following substances: 25 kg of vegetable oil, 10 kg of emulsifier nonylphenol polyoxyethylene ether, 12 kg of lubricant nanoporous carbon / molybdenum composite particles 1, 15 kg of rust inhibitor 4, 0.1 kg of defoaming agent and 10 kg of water.

[0110] A method for preparing an environmentally friendly and biodegradable cutting fluid comprises the following steps:

[0111] First, mix the vegetable oil, lubricant and rust inhibitor and collect the first mixed liquid;

[0112] Then, deionized water and defoaming agent were added and stirred to obtain a second mixed solution;

[0113] The environmentally friendly and degradable cutting fluid is prepared by mixing the first mixed liquid and the second mixed liquid, adding an emulsifier, stirring and mixing, and then subjecting the mixture to ultrasonic oscillation at 300W.

[0114] Example 9

[0115] An environmentally friendly and biodegradable cutting fluid comprises the following substances: 25 kg of vegetable oil, 10 kg of emulsifier nonylphenol polyoxyethylene ether, 12 kg of lubricant nanoporous carbon / molybdenum composite particles 1, 15 kg of rust inhibitor 5, 0.1 kg of defoaming agent and 10 kg of water.

[0116] A method for preparing an environmentally friendly and biodegradable cutting fluid comprises the following steps:

[0117] First, mix the vegetable oil, lubricant and rust inhibitor and collect the first mixed liquid;

[0118] Then, deionized water and defoaming agent were added and stirred to obtain a second mixed solution;

[0119] The environmentally friendly and degradable cutting fluid is prepared by mixing the first mixed liquid and the second mixed liquid, adding an emulsifier, stirring and mixing, and then subjecting the mixture to ultrasonic oscillation at 300W.

[0120] Example 10

[0121] An environmentally friendly and biodegradable cutting fluid comprises the following substances: 25 kg of vegetable oil, 10 kg of emulsifier nonylphenol polyoxyethylene ether, 12 kg of lubricant nanoporous carbon / molybdenum composite particles 1, 15 kg of rust inhibitor 6, 0.1 kg of defoaming agent and 10 kg of water.

[0122] A method for preparing an environmentally friendly and biodegradable cutting fluid comprises the following steps:

[0123] First, mix the vegetable oil, lubricant and rust inhibitor and collect the first mixed liquid;

[0124] Then, deionized water and defoaming agent were added and stirred to obtain a second mixed solution;

[0125] The environmentally friendly and degradable cutting fluid is prepared by mixing the first mixed liquid and the second mixed liquid, adding an emulsifier, stirring and mixing, and then subjecting the mixture to ultrasonic oscillation at 300W.

[0126] Performance testing

[0127] The performance of the environmentally friendly and degradable cutting fluids prepared by the technical solutions of Examples 1 to 10 was tested, and the specific characterization scheme was based on the following standards:

[0128] Lubricity: The spindle speed of the four-ball machine for the lubricity test is set at 600 r / min, and the test time is 10 minutes. The test method is as follows: clean the oil box, steel balls, etc. used in the test with gasoline solvent, then clean them twice with petroleum ether, and blow dry them with a hair dryer; fix the steel balls and oil box, dilute 10mL of cutting fluid by 5% by mass so that the steel balls and the joints of the steel balls are completely immersed in the liquid; continue the test for 10 minutes, and measure the experimental value;

[0129] Rust resistance: Take a glass desiccator with a diameter of 250mm and add 1 / 3 of water to the bottom of the desiccator; the test piece is made of first-grade gray cast iron that meets the requirements of GB / T718, and is cylindrical with a diameter of 35mm and a height of 20.

[0130] Single piece anti-rust test: Polish the surface of the anti-rust test piece with fine sandpaper, wipe off the oil and other dirt on the surface with absorbent cotton dipped in acetone or anhydrous ethanol, place it in an oven to dry or blow it dry with a hair dryer, and drip five drops of 5% by mass environmentally friendly biodegradable cutting fluid on the polished test piece in a plum blossom format, with each drop having a diameter of 4mm. Place the test piece on the gap between the holes of the dryer partition, cover it, and place it in a constant temperature box with a temperature of 35±2℃. Test it continuously for 24 hours, take it out, and observe it. If there is no rust at all and it is as bright as new, it is Class A. Four drops of no rust and slight discoloration are Class B. Three drops of no rust and moderate discoloration are Class C. Four or five drops of full rust and severe discoloration are Class D. Class A is qualified. The test results are shown in Table 1:

[0131] Table 1 Performance test table

[0132]

[0133]

[0134] The data in Table 1 for Examples 1-5 demonstrates that the use of nanoporous carbon / molybdenum composite particles as the primary lubricating particles effectively improves the bonding between carbon and molybdenum, mitigating the agglomeration of the two that occurs with conventional additives. Furthermore, the composite particles can penetrate the contact area of the friction pair and form a lubricating film, thereby reducing friction and wear. Furthermore, the triboactive nanoparticles possess high shear strength, which helps improve the load-bearing capacity of the lubricating film.

[0135] Comparison between Examples 6 to 10 and Examples 1 to 5 shows that the present application further optimizes the rust inhibitor material components. By selecting fatty acid esters as rust inhibitors, on the one hand, tall oil fatty acid esters are environmentally friendly and the addition amount is moderate, which meets the requirements of environmentally friendly cutting fluid components; on the other hand, tall oil fatty acid esters are combined with graphene to improve the lubrication properties of low-sulfur diesel, reduce the wear scar diameter and friction coefficient, and form a good coating layer structure on the metal surface, thereby improving the contact area between the metal and the air after cutting, thereby further improving its rust prevention and lubrication properties.

[0136] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but as long as they are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. An environmentally friendly and degradable cutting fluid, characterized in that: The composition includes the following materials in parts by weight: 25-40 parts vegetable oil; 10-30 parts of emulsifier; 12-20 parts of lubricant; 15-25 parts of rust inhibitor; 0.1-1.0 parts of defoaming agent; 10-40 parts water; The lubricant is nanoporous carbon / molybdenum composite particles; the nanoporous carbon / molybdenum composite particles are prepared using the following scheme: Add polyvinyl alcohol to DMF, stir and mix, add ferric acetylacetonate and phosphoric acid solution, stir and mix, and collect the mixture; The mixed liquid is spray-dried, and the dried particles are collected and placed in a tube furnace. The temperature is first raised to 250-280°C and kept warm, and then carbonized to obtain intermediate particles. Sodium molybdate and thiourea are mixed and placed in deionized water, intermediate particles are added and placed in a reaction device, heat-treated at 175-200° C., etched with nitric acid, washed and dried, ground and sieved to prepare the nanoporous carbon / molybdenum composite particles.

2. The environmentally friendly and degradable cutting fluid according to claim 1, characterized in that: The rust inhibitor comprises the following materials in parts by weight: 35-50 parts of sodium silicate; 6-12 parts of triethanolamine; 3 to 5 parts of boric acid.

3. The environmentally friendly and degradable cutting fluid according to claim 2, characterized in that: The rust inhibitor further comprises 3 to 10 parts by weight of graphene-tall oil fatty acid ester.

4. The environmentally friendly and degradable cutting fluid according to claim 3, characterized in that: The graphene is alkylated modified graphene.

5. The method for preparing an environmentally friendly and degradable cutting fluid according to any one of claims 1 to 4, characterized in that: The method comprises the following preparation steps: First, mix the vegetable oil, lubricant and rust inhibitor and collect the first mixed liquid; Then, deionized water and defoaming agent were added and stirred to obtain a second mixed solution; The environmentally friendly and degradable cutting fluid is prepared by mixing the first mixed liquid and the second mixed liquid, adding an emulsifier, stirring and mixing, and then subjecting the mixture to ultrasonic oscillation.

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