Preparation method of environment-friendly cutting fluid with physical and chemical dual cooling functions

Abstract

The invention belongs to the technical field of preparation of cutting fluids for low-temperature cooling processing, and particularly relates to a preparation method of a physical and chemical dual-cooling environment-friendly cutting fluid. The cutting fluid comprises the following raw materials: 2-3 parts of base oil, 2-3 parts of a freezing point reducing mixing agent, 1-2 parts of a mixed amine absorbent, 1.5-2 parts of an antirust agent, 1.5-2 parts of an extreme pressure agent, 0.05-0.1 part of a preservative, 0.1-0.2 part of a defoaming agent, 1.3-2 parts of a nano reinforced phase, 1.3-2 parts of a dispersing agent and 122-185 parts of water. By adding the mixing agent for reducing the freezing point, the cutting fluid can still keep good flowability and permeability when used in a low-temperature environment. By adding the nano reinforced phase, the compression resistance and lubricating property of the cutting fluid are improved, the friction coefficient between cutters and chips is reduced, and the service life of the cutters is prolonged. Compared with the existing cutting fluid, the cutting fluid has excellent lubricating, cooling and cleaning effects, is outstanding in lubricating performance and cooling performance, and is suitable for being used in various cutting processing technologies.

Description

Technical Field

[0001] The invention belongs to the technical field of preparation of cutting fluid for low-temperature cooling processing, and specifically relates to a preparation method of a physical and chemical dual-cooling green and environmentally friendly cutting fluid. Technical Background

[0002] Cutting fluid is an indispensable cooling and lubricating medium in the field of processing and manufacturing, which mainly plays the role of cooling, lubrication, cleaning and rust prevention. In the process of metal cutting, complex thermal coupling occurs between the tool and the workpiece. The use of suitable cutting fluid can greatly reduce the cutting temperature and cutting force, improve the tool life and achieve higher dimensional accuracy and surface accuracy. Existing cutting fluids can be divided into two categories: oil-based cutting fluids and water-based cutting fluids. Although oil-based cutting fluids have excellent lubrication properties, they are difficult to fully penetrate into the tool-chip contact area due to poor fluidity, thus limiting the performance of their excellent lubrication effect. Compared with oil-based cutting fluids, water-based cutting fluids have excellent cooling performance and higher permeability between the tool-chip contact area, which can effectively reduce the temperature during the cutting process. However, water-based cutting fluids are easy to condense in low temperature environments, which greatly reduces their applicability under low temperature conditions and makes them unable to meet the needs of low temperature operations. Therefore, it is necessary to develop a new type of cutting fluid that combines high cooling efficiency and high lubrication properties, so that it can still maintain excellent fluidity and permeability in low temperature environments, thereby achieving high-quality and high-precision cutting. Summary of the invention

[0003] The invention provides a preparation method of a physical and chemical dual cooling green environmentally friendly cutting fluid, which comprises the following raw materials: 2-3 parts of base oil, 2-3 parts of a freezing point lowering mixture, 1-2 parts of a mixed amine absorbent, 1.5-2 parts of a rust inhibitor, 1.5-2 parts of an extreme pressure agent, 0.05-0.1 parts of a preservative, 0.1-0.2 parts of a defoaming agent, 1.3-2 parts of a nano-enhanced phase, 1.3-2 parts of a dispersant and 81.5-123 parts of water.

[0004] The base oil is a mixture of any one or more of No. 7 industrial white oil, No. 10 industrial white oil, No. 15 industrial white oil, No. 26 industrial white oil, No. 32 industrial white oil, soybean oil, rapeseed oil, and castor oil.

[0005] The freezing point lowering agent is a mixture of ethylene glycol and glycerol, wherein the mass ratio of ethylene glycol to glycerol is 5:1.

[0006] Furthermore, the freezing point lowering mixture is added to the cutting fluid to lower the freezing point of the cutting fluid and prevent the cutting fluid from condensing when used in a low temperature environment.

[0007] The mixed amine absorbent consists of a main absorbent and an activator.

[0008] Furthermore, the main absorbent is a mixture of any one or more of monoethanolamine (MEA), diethanolamine (DEA), N-methyldiethanolamine (MDEA), sterically hindered amine (AMP), N-methylcyclohexylamine (MCA), hydroxyethylethylenediamine (AEEA), diethylenetriamine (DETA), and triethylenetetramine (TETA).

[0009] Furthermore, the activator is piperazine (PZ), N-methylpiperazine (N-MPP), aminoethylpiperazine (AEP), and the molar ratio of the main absorbent to the activator is 3:1.

[0010] The mixed amine absorbent is sprayed toward the cutting area from the nozzle after the cutting fluid and the low-temperature carbon dioxide gas are mixed in the mixing chamber cavity. The cutting fluid is gradually heated up by the cutting heat, and the organic amine in the cutting fluid and the low-temperature carbon dioxide gas undergo an absorption reaction accompanied by chemical heat absorption, thereby reducing the cutting temperature.

[0011] Furthermore, the flow rate of the cutting fluid is regulated by a flow valve so that the flow rate of the cutting fluid passing through the flow valve is maintained at 15-25 L / min.

[0012] The carbon dioxide is provided by a liquid carbon dioxide tank. After the low-temperature micro-throttle valve is opened, the liquid carbon dioxide is gasified to form a low-temperature gas-liquid mixture due to the pressure difference. The low-temperature gas-liquid mixture is merged with the cutting fluid containing the mixed amine absorbent in the mixing chamber cavity, so that the temperature of the cutting fluid is greatly reduced, thereby improving the cooling efficiency of the cutting fluid.

[0013] Furthermore, the cryogenic micro-throttle valve is responsible for regulating the mass flow rate of liquid carbon dioxide so that the mass flow rate of liquid carbon dioxide passing through the cryogenic flow throttle valve is maintained at 20-50 g / min.

[0014] The rust preventive is oleic acid diethanolamide borate, 84.7g of oleic acid is heated to 80°, 10.5g of diethanolamine is added, toluene is used as a water-carrying agent, and when the free acid content is lower than 15%, 21g of diethanolamine is added again, and oleic acid diethanolamide is obtained after heat preservation reaction for 4-6 hours. Then 88.6g of oleic acid diethanolamide, 12.4g of boric acid, and 80ml of n-butanol are placed in a reactor with magnetic stirring, heated to 120°-180°, reacted for 4-6 hours until no water is generated, and oleic acid diethanolamide borate is obtained after cooling.

[0015] The extreme pressure agent is a mixture of any one or more of butyl stearate, methyl stearate, neopentyl polyol ester, trimethylolpropane oleate, and ethylene glycol dimer.

[0016] The preservative is any one of kason, sodium benzoate or benzotriazole.

[0017] The nano-reinforced phase is a mixture of any one or more of graphite, multi-walled carbon nanotubes, diamond nanoparticles, Fe3O4 nanoparticles, TiO2 nanoparticles, CuO nanoparticles, SiO2 nanoparticles, SiC nanoparticles, and Al2O3 nanoparticles.

[0018] Furthermore, the nano-enhanced phase enters the tool-chip contact area through the cutting fluid, converting the contact sliding friction between the tool and the chip into the rolling friction of the nano-enhanced phase, thereby reducing the friction coefficient between the tool and the chip and improving the lubrication and compression resistance of the cutting fluid.

[0019] The dispersant is a mixture of any one or more of oleic acid, sodium dodecylbenzene sulfonate, sodium dodecyl sulfate, span-80, Tween-20, and hexadecyltrimethylammonium bromide, and the ratio of the dispersant to the nano-enhanced phase is 1:1.

[0020] The present invention also provides a method for preparing a physical and chemical dual cooling green environmentally friendly cutting fluid, the specific steps of which are as follows:

[0021] S1: 20-30wt.% base oil, 20-30wt.% freezing point lowering agent, 10-20wt.% mixed amine absorbent, 15-20wt.% extrusion agent, 15-20wt.% rust inhibitor, 0.5-1wt.% preservative, 1-2wt.% defoamer. Add the above raw materials into a beaker with a stirrer in order and stir for 30 minutes to obtain a cutting fluid stock solution;

[0022] S2: diluting the cutting fluid stock solution prepared in step S1 with water at a ratio of 1:10 to obtain a diluted working fluid;

[0023] S3: adding the nano-reinforced phase into the working solution at a mass fraction of 1-3wt.%;

[0024] S4: adding a dispersant to the working solution prepared in step S3 and stirring for 30 minutes, wherein the mass ratio of the dispersant to the nano-enhanced phase is 1:1;

[0025] S5: Continue to vibrate for 60 minutes by ultrasonic vibration to disperse the nano-enhanced phase in the working solution prepared in step S4;

[0026] S6: let the working solution after ultrasonic vibration in step S5 stand for one week;

[0027] S7: Use a visible light protractor to test within a characteristic wavelength range of 500nm-1000nm, and detect that the minimum transmittance I is less than 5%;

[0028] S8: Place the working fluid in a low-temperature constant-temperature reaction bath, set the reaction bath temperature to -25°C, and observe that the cutting fluid has no freezing within 30 minutes, indicating that the cutting fluid preparation is complete.

[0029] Compared with the prior art, the advantages of the physical and chemical dual cooling green environmentally friendly cutting fluid provided by the present invention are as follows:

[0030] 1. By adding a certain ratio of freezing point lowering mixture, the freezing point of the cutting fluid is lowered, so that the cutting fluid can still maintain good fluidity and permeability in a low temperature environment.

[0031] 2. By adding mixed amine absorbent compounds, the organic amine molecules in the working fluid react with the low-temperature carbon dioxide gas under the cutting heat, and absorb the low-temperature carbon dioxide gas while undergoing a chemical endothermic reaction to cool the cutting area. At the same time, it prevents the low-temperature carbon dioxide gas from being directly discharged into the atmosphere, achieving low-carbon and environmentally friendly manufacturing.

[0032] 3. By adding nano-enhanced phases to the cutting fluid, the contact sliding friction between the tool and the chips is converted into rolling friction with the nano-enhanced phases, reducing the friction coefficient between the tool and the chips, thereby improving the lubrication performance of the cutting fluid. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a flow chart for preparing a physical and chemical dual cooling green environmentally friendly cutting fluid in the present invention;

[0034] Figure 2 It is a schematic diagram of the use method of a physical and chemical dual cooling green environmentally friendly cutting fluid in the present invention.

[0035] The numbers in the figure are as follows:

[0036] 1-1. Liquid carbon dioxide tank; 1-2. Cutting fluid tank; 1-3. Cutting fluid pump; 1-4. Flow valve; 1-5. Pressure reducing valve; 1-6. Low-temperature micro-throttle valve; 1-7. Mixing chamber; 1-8. Nozzle; 1-9. Cutting area. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only embodiments of a part of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] like Figure 1 As shown, this embodiment provides a preparation process of a physical and chemical dual cooling green environmentally friendly cutting fluid, comprising the following steps:

[0039] S1: Add seven kinds of raw materials, including base oil, freezing point lowering agent, mixed amine absorbent, extrusion agent, rust inhibitor, preservative and defoaming agent, into a beaker with a stirrer and mix and stir to obtain a cutting fluid stock solution;

[0040] S2: diluting the cutting fluid stock solution prepared in step S1 with water to obtain a diluted working fluid;

[0041] S3: adding the nano-reinforced phase into the working solution;

[0042] S4: adding the dispersant to the working solution prepared in step S3 for mixing and stirring;

[0043] S5: Physically dispersing the nano-enhanced phase by ultrasonic vibration to disperse the nano-enhanced phase in the working solution prepared in step S4;

[0044] S6: let the working solution after ultrasonic vibration in step S5 stand for one week;

[0045] S7: Use a visible light spectrometer to test the working fluid that has been stationary in step S6;

[0046] S8: Place the working fluid in a low-temperature constant-temperature reaction bath and detect that there is no freezing of the working fluid in an environment of -25°C, indicating that the cutting fluid preparation is complete.

[0047] like Figure 2 As shown, this embodiment provides a method for using a green and environmentally friendly cutting fluid with physical and chemical dual cooling. The cutting fluid is stored in a cutting fluid tank 1-2, and the cutting fluid is delivered to a mixing chamber 1-7 by a cutting fluid pump 1-3. Carbon dioxide is stored in a liquid carbon dioxide tank 1-1 in a liquid state. When the low-temperature micro-throttle valve 1-6 is opened, a huge pressure difference is generated, and the liquid carbon dioxide is gasified to form a low-temperature gas-liquid mixture. The low-temperature gas-liquid mixture is fully integrated with the cutting fluid containing a mixed amine absorbent in the cavity of the mixing chamber 1-7, so that the temperature of the cutting fluid is greatly reduced, so as to improve the cooling efficiency of the cutting fluid.

[0048] Furthermore, the flow valve 1-4 is responsible for regulating the flow of the cutting fluid, and the flow of the cutting fluid is maintained between 15-25 L / min. The cryogenic micro-throttle valve 1-6 is responsible for regulating the mass flow of the liquid carbon dioxide, and the flow of the liquid carbon dioxide is maintained at 20-50 g / min.

[0049] Furthermore, the mixed amine absorbent in the cutting fluid is mixed with the low-temperature carbon dioxide gas in the cavity of the mixing chamber 1-7 and then sprayed toward the cutting area 1-9 through the nozzle 1-8. The cutting fluid is gradually heated up by the cutting heat, and the organic amine in the cutting fluid reacts with the low-temperature carbon dioxide gas to generate carbamate or bicarbonate soluble in water. The process in which the organic amine molecules chemically react with the carbon dioxide gas to generate carbamate or bicarbonate is accompanied by heat absorption, which further reduces the cutting temperature.

[0050] Specific embodiment 1: Take 25wt.% (125g) No. 7 industrial white oil, 12.5wt.% (104.2g) ethylene glycol, 12.5wt.% (20.8g) propylene glycol, 9.6wt.% (48g) monoethanolamine (MEA), 6.4wt.% (32g) piperazine PZ, 16wt.% (80g) oleic acid diethanolamide borate, 16wt.% (80g) butyl stearate, 0.6wt.% (3g) Kathon, 1.4wt.% (7g) defoamer, mix and stir the above raw materials for 30 minutes to obtain 500g cutting fluid stock solution.

[0051] The cutting fluid stock solution was diluted with 5000 g of water to obtain a working fluid, and then 80 g of graphite was added to the working fluid for stirring. At the same time, 80 g of oleic acid was added. After continuous stirring for 30 minutes, ultrasonic vibration was used for physical dispersion and vibration was continued for 60 minutes to obtain 5160 g of working fluid.

[0052] 5160g of the working fluid was sampled, 200ml of the working fluid was taken and left to stand for a week, and then the visible light test and low temperature freezing point test were performed respectively. If the test passed, a physical and chemical dual cooling green environmentally friendly cutting fluid was obtained.

[0053] Specific embodiment 2: Take 25wt.% (125g) No. 10 industrial white oil, 12.5wt.% (104.2g) ethylene glycol, 12.5wt.% (20.8g) propylene glycol, 9.6wt.% (48g) diethanolamine (DEA), 6.4wt.% (32g) piperazine PZ, 16wt.% (80g) oleic acid diethanolamide borate, 16wt.% (80g) methyl stearate, 0.6wt.% (3g) kason, 1.4wt.% (7g) defoamer, mix and stir the above raw materials for 30 minutes to obtain 500g cutting fluid stock solution.

[0054] The cutting fluid stock solution was diluted with 5000g of water to obtain a working solution, and then 80g of multi-walled carbon nanotubes were added to the working solution and stirred. At the same time, 80g of sodium dodecylbenzene sulfonate was added. After continuous stirring for 30 minutes, ultrasonic vibration was used for physical dispersion and continued to vibrate for 60 minutes to obtain 5160g of working solution.

[0055] 5160g of the working fluid was sampled, 200ml of the working fluid was taken and left to stand for a week, and then the visible light test and low temperature freezing point test were performed respectively. If the test passed, a physical and chemical dual cooling green environmentally friendly cutting fluid was obtained.

[0056] Specific embodiment three: Take 25wt.% (125g) No. 15 industrial white oil, 12.5wt.% (104.2g) ethylene glycol, 12.5wt.% (20.8g) propylene glycol, 9.6wt.% (48g) N-methyldiethanolamine (MDEA), 6.4wt.% (32g) piperazine PZ, 16wt.% (80g) oleic acid diethanolamide borate, 16wt.% (80g) neopentyl polyol ester, 0.6wt.% (3g) kason, 1.4wt.% (7g) defoamer, mix and stir the above raw materials for 30 minutes to obtain 500g cutting fluid stock solution.

[0057] The cutting fluid stock solution was diluted with 5000 g of water to obtain a working fluid, and then 80 g of diamond nanoparticles were added to the working fluid for stirring. At the same time, 80 g of sodium dodecyl sulfate was added. After continuous stirring for 30 minutes, ultrasonic vibration was used for physical dispersion and vibration was continued for 60 minutes to obtain 5160 g of working fluid.

[0058] 5160g of the working fluid was sampled, 200ml of the working fluid was taken and left to stand for a week, and then the visible light test and low temperature freezing point test were performed respectively. If the test passed, a physical and chemical dual cooling green environmentally friendly cutting fluid was obtained.

[0059] Specific embodiment 4: Take 25wt.% (125g) No. 26 industrial white oil, 12.5wt.% (104.2g) ethylene glycol, 12.5wt.% (20.8g) propylene glycol, 9.6wt.% (48g) steric hindered amine (AMP), 6.4wt.% (32g) piperazine PZ, 16wt.% (80g) oleic acid diethanolamide borate, 16wt.% (80g) trimethylolpropane oleate, 0.6wt.% (3g) kason, 1.4wt.% (7g) defoamer, mix and stir the above raw materials for 30 minutes to obtain 500g cutting fluid stock solution.

[0060] The cutting fluid stock solution was diluted with 5000 g of water to obtain a working fluid, and then 80 g of Fe3O4 nanoparticles were added to the working fluid and stirred. At the same time, 80 g of span-80 was added. After continuous stirring for 30 minutes, ultrasonic vibration was used for physical dispersion and continued to vibrate for 60 minutes to obtain 5160 g of working fluid.

[0061] 5160g of the working fluid was sampled, 200ml of the working fluid was taken and left to stand for a week, and then the visible light test and low temperature freezing point test were performed respectively. If the test passed, a physical and chemical dual cooling green environmentally friendly cutting fluid was obtained.

[0062] Specific embodiment five: Take 25wt.% (125g) No. 32 industrial white oil, 12.5wt.% (104.2g) ethylene glycol, 12.5wt.% (20.8g) propylene glycol, 9.6wt.% (48g) N-methylcyclohexylamine (MCA), 6.4wt.% (32g) piperazine PZ, 16wt.% (80g) oleic acid diethanolamide borate, 16wt.% (80g) dimerized linoleic acid glycol ester, 0.6wt.% (3g) kason, 1.4wt.% (7g) defoamer, mix and stir the above raw materials for 30 minutes to obtain 500g cutting fluid stock solution.

[0063] The cutting fluid stock solution was diluted with 5000 g of water to obtain a working fluid, and then 80 g of TiO2 nanoparticles were added to the working fluid and stirred. At the same time, 80 g of Tween-20 was added. After continuous stirring for 30 minutes, ultrasonic vibration was used for physical dispersion and vibration was continued for 60 minutes to obtain 5160 g of working fluid.

[0064] 5160g of the working fluid was sampled, 200ml of the working fluid was taken and left to stand for a week, and then the visible light test and low temperature freezing point test were performed respectively. If the test passed, a physical and chemical dual cooling green environmentally friendly cutting fluid was obtained.

[0065] Specific Example 6: Take 25wt.% (125g) soybean oil, 12.5wt.% (104.2g) ethylene glycol, 12.5wt.% (20.8g) propylene glycol, 9.6wt.% (48g) hydroxyethylethylenediamine (AEEA), 6.4wt.% (32g) piperazine PZ, 16wt.% (80g) oleic acid diethanolamide borate, 16wt.% (80g) dimerized linoleic acid glycol ester, 0.6wt.% (3g) kason, 1.4wt.% (7g) defoamer, mix and stir the above raw materials for 30 minutes to obtain 500g cutting fluid stock solution.

[0066] The cutting fluid stock solution was diluted with 5000 g of water to obtain a working fluid, and then 80 g of CuO nanoparticles were added to the working fluid and stirred. At the same time, 80 g of hexadecyltrimethylammonium bromide was added. After continuous stirring for 30 minutes, ultrasonic vibration was used for physical dispersion and continued to vibrate for 60 minutes to obtain 5160 g of the working fluid.

[0067] 5160g of the working fluid was sampled, 200ml of the working fluid was taken and left to stand for a week, and then the visible light test and low temperature freezing point test were performed respectively. If the test passed, a physical and chemical dual cooling green environmentally friendly cutting fluid was obtained.

[0068] Specific embodiment seven: Take 25wt.% (125g) rapeseed oil, 12.5wt.% (104.2g) ethylene glycol, 12.5wt.% (20.8g) propylene glycol, 9.6wt.% (48g) diethylenetriamine (DETA), 6.4wt.% (32g) piperazine PZ, 16wt.% (80g) oleic acid diethanolamide borate, 16wt.% (80g) dimerized linoleic acid glycol ester, 0.6wt.% (3g) kason, 1.4wt.% (7g) defoamer, mix and stir the above raw materials for 30 minutes to obtain 500g cutting fluid stock solution.

[0069] The cutting fluid stock solution was diluted with 5000g of water to obtain a working fluid, and then 80g of SiO2 nanoparticles were added to the working fluid and stirred. At the same time, 80g of hexadecyltrimethylammonium bromide was added. After continuous stirring for 30 minutes, ultrasonic vibration was used for physical dispersion and vibration was continued for 60 minutes to obtain 5160g of working fluid.

[0070] 5160g of the working fluid was sampled, 200ml of the working fluid was taken and left to stand for a week, and then the visible light test and low temperature freezing point test were performed respectively. If the test passed, a physical and chemical dual cooling green environmentally friendly cutting fluid was obtained.

[0071] Specific embodiment eight: Take 25wt.% (125g) castor oil, 12.5wt.% (104.2g) ethylene glycol, 12.5wt.% (20.8g) propylene glycol, 9.6wt.% (48g) triethylenetetramine (TETA), 6.4wt.% (32g) piperazine PZ, 16wt.% (80g) oleic acid diethanolamide borate, 16wt.% (80g) dimerized linoleic acid glycol ester, 0.6wt.% (3g) kason, 1.4wt.% (7g) defoamer, mix and stir the above raw materials for 30 minutes to obtain 500g cutting fluid stock solution.

[0072] The cutting fluid stock solution was diluted with 5000 g of water to obtain a working fluid, and then 80 g of SiC nanoparticles were added to the working fluid and stirred. At the same time, 80 g of hexadecyltrimethylammonium bromide was added. After continuous stirring for 30 minutes, ultrasonic vibration was used for physical dispersion and vibration was continued for 60 minutes to obtain 5160 g of the working fluid.

[0073] 5160g of the working fluid was sampled, 200ml of the working fluid was taken and left to stand for a week, and then the visible light test and low temperature freezing point test were performed respectively. If the test passed, a physical and chemical dual cooling green environmentally friendly cutting fluid was obtained.

[0074] It can be seen from Table 1 that all eight groups of example samples passed the performance test, and the low-temperature freezing point measured in the low-temperature reaction bath was less than -25°C, which can meet the use requirements in a low-temperature environment. The transmittance of the eight groups of example samples after being placed for one week was less than 5%, and the nano-enhanced phase had good dispersibility in the cutting fluid, ensuring the stability and high efficiency of the cutting fluid for long-term use.

[0075] Table 1 Example sample group performance test results

[0076] Example pH color Low temperature freezing point (℃) Transmittance(%) Embodiment 1 9 black ＜-25 ＜5 Embodiment 2 9 black ＜-25 ＜5 Embodiment 3 9 black ＜-25 ＜5 Embodiment 4 9 black ＜-25 ＜5 Embodiment 5 9 black ＜-25 ＜5 Embodiment 6 9 black ＜-25 ＜5 Embodiment 7 9 black ＜-25 ＜5 Embodiment 8 9 black ＜-25 ＜5

Claims

1. A physical and chemical dual cooling green environmentally friendly cutting fluid, characterized in that: The components include, by weight: 2-3 parts of base oil, 2-3 parts of freezing point lowering agent, 1-2 parts of mixed amine absorbent, 1.5-2 parts of rust inhibitor, 1.5-2 parts of extreme pressure agent, 0.05-0.1 parts of preservative, 0.1-0.2 parts of defoaming agent, 0.9-1.35 parts of nano-enhanced phase, 0.9-1.35 parts of dispersant and 81.5-123 parts of water.

2. The physical and chemical dual cooling green environmentally friendly cutting fluid according to claim 1, characterized in that: The base oil is a mixture of any one or more of No. 7 industrial white oil, No. 10 industrial white oil, No. 15 industrial white oil, No. 26 industrial white oil, No. 32 industrial white oil, soybean oil, rapeseed oil, and castor oil.

3. The physical and chemical dual cooling green environmentally friendly cutting fluid according to claim 1, characterized in that: The freezing point reducing mixture is a mixture of ethylene glycol and propylene glycol, wherein the mass ratio of ethylene glycol to propylene glycol is 5:

1. The freezing point reducing mixture is added to the cutting fluid to reduce the freezing point of the cutting fluid during use and prevent the cutting fluid from condensing in a low temperature environment.

4. The physical and chemical dual cooling green environmentally friendly cutting fluid according to claim 1, characterized in that: The mixed amine absorbent is composed of a main absorbent and an activator, wherein the main absorbent is a mixture of any one or more of monoethanolamine (MEA), diethanolamine (DEA), N-methyldiethanolamine (N-MDEA), sterically hindered amine (AMP), N-methylcyclohexylamine (MCA), hydroxyethylethylenediamine (AEEA), diethylenetriamine (DETA), and triethylenetetramine (TETA), and the activator is any one of piperazine (PZ), N-methylpiperazine (N-MPP), and aminoethylpiperazine (AEP), and the molar stoichiometric ratio of the main absorbent to the activator is 3:

1.

5. The physical and chemical dual cooling green environmentally friendly cutting fluid according to claim 1, characterized in that: The nano-reinforced phase is a mixture of any one or more of graphite, multi-walled carbon nanotubes, diamond nanoparticles, Fe3O4 nanoparticles, TiO2 nanoparticles, CuO nanoparticles, SiO2 nanoparticles, SiC nanoparticles, and Al2O3 nanoparticles. The nano-reinforced phase enters the tool-chip contact area through the cutting fluid, converts the contact sliding friction between the tool and the chip into rolling friction of the nano-reinforced phase, thereby reducing the friction coefficient between the tool and the chip and improving the lubrication and compression resistance of the cutting fluid.

6. The physical and chemical dual cooling green environmentally friendly cutting fluid according to claim 1, characterized in that: The dispersant is a mixture of any one or more of oleic acid, sodium dodecylbenzene sulfonate, sodium dodecyl sulfate, span-80, Tween-20, and hexadecyltrimethylammonium bromide, and the ratio of the dispersant to the nano-enhanced phase is 1:

1.

7. A method for preparing a physical and chemical dual cooling green environmentally friendly cutting fluid, characterized in that: The following steps are involved: S1: Take 2-3 parts of base oil, 2-3 parts of freezing point lowering agent, 1-2 parts of mixed amine absorbent, 1.5-2 parts of rust inhibitor, 1.5-2 parts of extreme pressure agent, 0.05-0.1 parts of preservative, 0.1-0.2 parts of defoamer, add the above raw materials into a beaker with a stirrer in order and stir for 30 minutes to obtain a cutting fluid stock solution (cutting fluid before dilution); S2: diluting the cutting fluid stock solution prepared in step S1 with water at a ratio of 1:10 to obtain a working fluid (diluted cutting fluid); S3: adding the nano-reinforced phase into the working liquid at a mass fraction of 1-3 wt.% of the working liquid; S4: adding a dispersant to the working solution prepared in step S3 and stirring for 30 minutes, wherein the mass ratio of the dispersant to the nano-enhanced phase is 1:1; S5: Using ultrasonic vibration for 60 minutes to evenly disperse the nano-enhanced phase in the working solution prepared in step S4; S6: let the working solution after ultrasonic vibration in step S5 stand for one week; S7: Use a visible light spectrometer to test within the characteristic wavelength range of 500nm-1000nm, and detect that the minimum transmittance is less than 5%; S8: Place the working fluid in a low-temperature constant-temperature reaction bath, set the reaction bath temperature to -25°C, and observe that the cutting fluid has no freezing within 30 minutes, indicating that the cutting fluid preparation is complete.

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