Environment-friendly bacteriostatic water-soluble coolant and preparation method thereof

Abstract

The present application relates to a kind of environment-friendly bacteriostatic water-soluble coolant and its preparation method, belong to the technical field of coolant.It includes the following raw materials, by weight percentage, environment-friendly composite oil 30%~50%, dicyclohexylamine 6%~8%, surfactant 4%~5%, modified graphene nanofluid 3%~5%, ethylene glycol butyl ether 2.5%~3.5%, pH adjusting stabilizer 1%~2%, alcohol ether carboxylic acid 0.8%~1.2%, dodecanedioic acid 0.4%~0.6%, benzene triazole 0.2%~0.4%, silicone defoaming agent 0.1%~0.3%, deionized water balance.The formula and preparation process of the coolant of the present application have the characteristics of green environmental protection, and the prepared coolant has good bacteriostatic property.

Description

Technical Field

[0001] This invention belongs to the field of coolant technology and relates to an environmentally friendly antibacterial water-soluble coolant and its preparation method. Background Technology

[0002] Coolant plays a crucial role in metal cutting processes. It not only cools the cutting tool and the workpiece, reducing cutting heat, but also provides necessary lubrication, reducing cutting forces and friction, thereby extending metal life and improving surface finish. However, traditional coolants often contain harmful components such as boron and chlorine, which can pollute the environment and harm the health of operators. Furthermore, some coolants are prone to bacterial growth during use, leading to deterioration and foul odors, which not only affect machining results but may also corrode equipment and workpieces. Therefore, developing a cutting fluid that is both environmentally friendly and has antibacterial properties is of paramount importance. Summary of the Invention

[0003] The purpose of this invention is to provide an environmentally friendly antibacterial water-soluble coolant and its preparation method, which has the characteristics of being green and environmentally friendly and having good antibacterial properties.

[0004] The objective of this invention can be achieved through the following technical solutions:

[0005] An environmentally friendly, antibacterial, water-soluble coolant is formulated as follows (by weight percentage): 30%–50% environmentally friendly composite oil, 6%–8% dicyclohexylamine, 4%–5% surfactant, 3%–5% modified graphene nanofluid, 2.5%–3.5% ethylene glycol butyl ether, 1%–2% pH adjuster and stabilizer, 0.8%–1.2% alcohol ether carboxylic acid, 0.4%–0.6% dodecanoic acid, 0.2%–0.4% benzotriazole, 0.1%–0.3% organosilicon defoamer, and the balance being deionized water.

[0006] The preparation method of the environmentally friendly compound oil is as follows:

[0007] S1-1: Place a mixture of 20-30 parts by weight of castor oil and tall oil at 40-50°C and stir at 600-700 r / min for 30 min. Add 30 parts by weight of naphthenic base oil, increase the stirring speed to 800-900 r / min and continue stirring at 40-50°C for 30 min to obtain the mixed oil.

[0008] S1-2: Add 3-5 parts by weight of vanillin to 50-60 parts by weight of anhydrous ethanol, sonicate for 30 min, add 0.5 parts by weight of emulsifier, continue sonicating for 10 min, then add mixed oil, and stir at 750-850 r / min at 60℃ for 1 h to obtain the environmentally friendly composite oil.

[0009] As a preferred embodiment of the present invention, the preparation method of the modified graphene nanofluid is as follows:

[0010] S2-1: Place graphene oxide in a ball mill and ball mill for 1.5 h. The ball milling is carried out under the protection of high-purity nitrogen. Then, add 10-15 parts by weight of the ball-milled graphene oxide to 100 parts by weight of anhydrous ethanol and sonicate at 60-70℃ for 2-3 h with an ultrasonic power of 8-10 kW. Then, centrifuge in a high-speed centrifuge for 10-20 min to obtain solution A.

[0011] S2-2: Add 5-10 parts by weight of polyethylene glycol to solution A, stir at 650-750 r / min at 45-55℃ for 1-2 h, then add phosphate ester, raise the temperature to 80℃ and stir at 600-700 r / min for 1.5 h to obtain the modified graphene nanofluid.

[0012] As a preferred embodiment of the present invention, the pH adjusting stabilizer is a mixture of triethanolamine and AMP95 teramine in a mass ratio of 1:(1-2).

[0013] As a preferred embodiment of the present invention, the surfactant is one or both of fatty alcohol polyoxyethylene ether and sodium fatty alcohol polyoxyethylene ether sulfate.

[0014] As a preferred embodiment of the present invention, in the mixture of castor oil and tall oil in S1-1, the mass ratio of castor oil to tall oil is (1-3):1.

[0015] In a preferred embodiment of the present invention, the emulsifier in S1-2 is OP-10.

[0016] As a preferred embodiment of the present invention, the ball milling speed in S2-1 is 200-300 r / min.

[0017] As a preferred embodiment of the present invention, the speed of the high-speed centrifuge in S2-1 is set to 8000-10000 r / min.

[0018] As a preferred embodiment of the present invention, the amount of phosphate ester added in S2-2 is 3% to 5% of the mass of solution A.

[0019] A method for preparing an environmentally friendly, antibacterial, water-soluble coolant, the specific steps of which are as follows:

[0020] According to the formula ratio, the environmentally friendly composite oil, dicyclohexylamine, surfactant, modified graphene nanofluid, ethylene glycol butyl ether, pH adjusting stabilizer, alcohol ether carboxylic acid, dodecanoic acid, benzotriazole, organosilicon defoamer and deionized water are mixed, homogenized at 40-50℃ for 1-2 hours, and then left to stand at room temperature for 8-12 hours to obtain the environmentally friendly antibacterial water-soluble coolant.

[0021] Castor oil, a non-edible vegetable oil that is not easily oxidized or acidified in air, has fewer unsaturated bonds in its molecules, thus exhibiting excellent antioxidant properties. This allows it to resist the corrosive effects of oxygen in the air, resulting in good storage stability and extending the service life of the coolant. Castor oil also possesses excellent lubricity and fluidity, making it an ideal lubricant and protective oil. Furthermore, the ricinoleic acid in castor oil has antibacterial properties, effectively inhibiting bacterial growth and preventing coolant contamination during use. The natural acidic components in tall oil can form a protective film inside the cooling system, effectively preventing corrosion and rust of metal components. Naphthenic base oils, with their good thermal and chemical stability, provide protection for the coolant under high-temperature and oxidizing environments, further ensuring the coolant's durability and reliability. In addition, the addition of vanillin not only adds aroma to the coolant but also works synergistically with castor oil to enhance its antibacterial properties. Anhydrous ethanol, as a solvent, not only promotes the uniform mixing and dispersion of the components, but also, due to its good volatility, helps to improve the cooling effect of the coolant; in addition, ethanol can also play a certain role in inhibiting bacteria in the coolant. Emulsifier OP-10, through its unique emulsifying effect, ensures the stable combination of the oil phase and the water phase, so that the coolant maintains good water solubility and stability.

[0022] This environmentally friendly compound oil boasts excellent lubrication properties. The lubricity of castor oil and tall oil, combined with the stability of the naphthenic base oil, ensures that the coolant effectively reduces friction and wear during circulation, protecting all components of the cooling system. The antibacterial and antioxidant properties of vanillin and castor oil, along with the stability of the environmentally friendly compound oil system, help inhibit the growth of bacteria and other microorganisms, preventing the coolant from becoming contaminated and deteriorating during use. The combined action of emulsifier OP-10 and the naphthenic base oil ensures the stability of the coolant under prolonged high-temperature and high-pressure environments, enabling it to continuously and effectively perform its cooling and lubrication functions. Castor oil, tall oil, and anhydrous ethanol all exhibit good biodegradability, reducing environmental pollution. Furthermore, the entire coolant formulation complies with environmental protection requirements, helping to reduce the pressure on industrial wastewater treatment.

[0023] Graphene nanofluids possess high thermal conductivity and thermal diffusivity, enabling them to more effectively absorb heat and release it into the environment. This contributes to improving the heat conversion efficiency of coolants, thus their excellent thermal conductivity allows them to more effectively lower temperatures when used as a coolant component. Compared to traditional coolants, graphene nanofluids also offer advantages in terms of environmental friendliness and sustainability, having a lower environmental impact and aligning with the principles of green chemistry. Furthermore, graphene itself possesses excellent antibacterial properties. Its nanoscale structure and unique physicochemical properties effectively inhibit bacterial growth and reproduction, enhancing the antibacterial effect of the coolant. To further optimize the performance of graphene nanofluids in coolants, polyethylene glycol (PEG) is added as a dispersant. PEG significantly improves the dispersibility of graphene oxide in solution, ensuring uniform distribution of the graphene nanofluids in the coolant and thereby improving its thermal conductivity. Furthermore, the addition of phosphate esters further enhances the stability of graphene nanofluids. Phosphate esters are adsorbed onto the surface or interior of graphene oxide through physical or chemical processes, acting as surfactants or stabilizers to effectively prevent the aggregation of modified graphene nanofluids. Simultaneously, phosphate esters also possess rust-preventing and corrosion-inhibiting effects, providing additional protection for metal materials in water-soluble coolants and extending the service life of equipment.

[0024] The beneficial effects of this invention are:

[0025] (1) Castor oil, tall oil, and naphthenic base oil are used as the main components of the environmentally friendly composite oil. Castor oil has good antioxidant, lubricating, and antibacterial properties, effectively extending the service life of the coolant and preventing contamination during use. The protective film formed by tall oil and the stability of naphthenic base oil further ensure that the metal parts of the cooling system are protected from corrosion and rust, while improving the durability and reliability of the coolant. The addition of vanillin further promotes the antibacterial properties of castor oil. Emulsifier OP-10 ensures the stable combination of the oil and water phases, promoting the storage stability of the coolant.

[0026] (2) The high thermal conductivity and thermal diffusivity of graphene nanofluids significantly improve the heat conversion efficiency of the coolant, achieving rapid cooling. Compared with traditional coolants, graphene nanofluids are more environmentally friendly and sustainable, conforming to the concept of green chemistry. Simultaneously, the antibacterial properties of graphene effectively inhibit bacterial growth, enhancing the antibacterial effect. The addition of polyethylene glycol as a dispersant ensures uniform distribution of the graphene nanofluids, further improving heat transfer efficiency. The addition of phosphate esters enhances stability, prevents graphene nanofluid aggregation, and also promotes the rust-preventing and corrosion-inhibiting functions of the coolant.

[0027] (3) A water-soluble coolant is prepared by mixing environmentally friendly composite oil, modified graphene nanofluid, and other additives in a certain proportion. Compared with traditional coolants, the formulation and material modification process of this invention uses a large number of green and environmentally friendly materials, ensuring the eco-friendliness of the entire production and use cycle. The resulting water-soluble coolant exhibits basic properties of high-efficiency cooling and lubrication, while also having good antibacterial effects. Detailed Implementation

[0028] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with embodiments, is provided below.

[0029] In the embodiments and comparative examples of this invention:

[0030] Castor oil: purchased from Changsha West Chemical Co., Ltd.;

[0031] Tall oil: purchased from Shanghai Baoyang Baoxin Biotechnology Co., Ltd.;

[0032] Naphthenic base oil: purchased from Shanghai Baoyang Baoxin Biotechnology Co., Ltd.;

[0033] Vanillin: Purchased from Sigma-Aldrich (Shanghai) Trading Co., Ltd.;

[0034] Emulsifier OP-10: Purchased from Pande (Shanghai) International Trading Co., Ltd.;

[0035] Graphene oxide: purchased from Anhui Kerun Nanotechnology Co., Ltd.

[0036] Polyethylene glycol: purchased from Shanghai Aladdin Biochemical Technology Co., Ltd.;

[0037] Phosphate ester: purchased from Guangdong Wengjiang Chemical Reagent Co., Ltd.;

[0038] Dicyclohexylamine: purchased from Huansheng Meisen Pharmaceutical Technology (Shandong) Co., Ltd.;

[0039] Fatty alcohol polyoxyethylene ether: purchased from Shandong Xinheng Chemical Co., Ltd.;

[0040] Ethylene glycol butyl ether: purchased from Jinan Chuangshi Chemical Co., Ltd.;

[0041] Triethanolamine: purchased from Shandong Bangde Chemical Co., Ltd.;

[0042] Alcohols, ethers, and carboxylic acids: purchased from Shanghai Jiadeer Chemical Technology Co., Ltd.;

[0043] Dodecanoic acid: purchased from Hangzhou Stean Chemical Co., Ltd.;

[0044] Benztriazole: Purchased from Nantong Botao Chemical Co., Ltd.;

[0045] Organosilicon defoamer: purchased from Jinan Longcheng Organosilicon Co., Ltd.

[0046] Example 1

[0047] An environmentally friendly, antibacterial, water-soluble coolant, wherein the formula 1 of the water-soluble coolant is as follows (by weight percentage): environmentally friendly composite oil 40%, dicyclohexylamine 7%, fatty alcohol polyoxyethylene ether 4.5%, modified graphene nanofluid 4%, ethylene glycol butyl ether 3%, triethanolamine 0.6%, AMP95 terephthalamide 0.9%, alcohol ether carboxylic acid 1%, dodecanoic acid 0.5%, benzotriazole 0.3%, silicone defoamer 0.2%, and deionized water as the balance.

[0048] The preparation method of the environmentally friendly compound oil is as follows:

[0049] S1-1: Mix 25 parts by weight of castor oil and tall oil, with a mass ratio of castor oil to tall oil of 2:1, and stir at 650 r / min for 30 min at 45°C. Add 30 parts by weight of naphthenic base oil, increase the speed to 850 r / min and continue stirring at 45°C for 30 min to obtain the mixed oil.

[0050] S1-2: Add 4 parts by weight of vanillin to 55 parts by weight of anhydrous ethanol, sonicate for 30 min, add 0.5 parts by weight of emulsifier OP-10, continue sonicating for 10 min, then add mixed oil, and stir at 800 r / min for 1 h at 60℃ to obtain the environmentally friendly composite oil.

[0051] As a preferred embodiment of the present invention, the preparation method of the modified graphene nanofluid is as follows:

[0052] S2-1: Graphene oxide was ball-milled for 1.5 h at a speed of 250 r / min under high-purity nitrogen protection. Then, 12 parts by weight of the ball-milled graphene oxide were added to 100 parts by weight of anhydrous ethanol and sonicated at 65 °C for 2.5 h at a power of 9 kW. The mixture was then centrifuged in a high-speed centrifuge for 15 min at a speed of 9000 r / min to obtain solution A.

[0053] S2-2: Add 8 parts by weight of polyethylene glycol to solution A, stir at 700 r / min for 1.5 h at 50 °C, then add phosphate ester, the amount of phosphate ester added is 4% of the mass of solution A, raise the temperature to 80 °C and stir at 650 r / min for 1.5 h to obtain the modified graphene nanofluid.

[0054] A method for preparing an environmentally friendly, antibacterial, water-soluble coolant, the specific steps of which are as follows:

[0055] According to Formula 1, the environmentally friendly composite oil, dicyclohexylamine, fatty alcohol polyoxyethylene ether, modified graphene nanofluid, ethylene glycol butyl ether, triethanolamine, AMP95 teramine, alcohol ether carboxylic acid, dodecanoic acid, benzotriazole, organosilicon defoamer and deionized water are mixed, homogenized at 45°C for 1.5 hours, and then left to stand at room temperature for 10 hours to obtain the environmentally friendly antibacterial water-soluble coolant.

[0056] Example 1

[0057] An environmentally friendly, antibacterial, water-soluble coolant, wherein the formula 2 of the water-soluble coolant is as follows (by weight percentage): environmentally friendly composite oil 30%, dicyclohexylamine 6%, fatty alcohol polyoxyethylene ether 4%, modified graphene nanofluid 3%, ethylene glycol butyl ether 2.5%, triethanolamine 0.5%, AMP95 terephthalamide 0.5%, alcohol ether carboxylic acid 0.8%, dodecanoic acid 0.4%, benzotriazole 0.2%, organosilicon defoamer 0.1%, and deionized water as the balance.

[0058] The preparation method of the environmentally friendly compound oil is as follows:

[0059] S1-1: Mix 20 parts by weight of castor oil and tall oil, with a mass ratio of castor oil to tall oil of 1:1, and stir at 600 r / min for 30 min at 40°C. Add 30 parts by weight of naphthenic base oil, increase the stirring speed to 800 r / min and continue stirring at 40°C for 30 min to obtain the mixed oil.

[0060] S1-2: Add 3 parts by weight of vanillin to 50 parts by weight of anhydrous ethanol, sonicate for 30 min, add 0.5 parts by weight of emulsifier OP-10, continue sonicating for 10 min, then add mixed oil, and stir at 750 r / min at 60℃ for 1 h to obtain the environmentally friendly composite oil.

[0061] As a preferred embodiment of the present invention, the preparation method of the modified graphene nanofluid is as follows:

[0062] S2-1: Graphene oxide was ball-milled for 1.5 hours at a speed of 200 r / min under high-purity nitrogen protection. Then, 10 parts by weight of the ball-milled graphene oxide were added to 100 parts by weight of anhydrous ethanol and sonicated at 60°C for 2 hours at a power of 8 kW. The mixture was then centrifuged in a high-speed centrifuge for 10 minutes at a speed of 8000 r / min to obtain solution A.

[0063] S2-2: Add 5 parts by weight of polyethylene glycol to solution A, stir at 650 r / min for 1 h at 45 °C, then add phosphate ester, the amount of phosphate ester added is 3% of the mass of solution A, raise the temperature to 80 °C and stir at 600 r / min for 1.5 h to obtain the modified graphene nanofluid.

[0064] A method for preparing an environmentally friendly, antibacterial, water-soluble coolant, the specific steps of which are as follows:

[0065] According to Formula 2, the environmentally friendly composite oil, dicyclohexylamine, fatty alcohol polyoxyethylene ether, modified graphene nanofluid, ethylene glycol butyl ether, triethanolamine, AMP95 teramine, alcohol ether carboxylic acid, dodecanoic acid, benzotriazole, organosilicon defoamer and deionized water are mixed, homogenized at 40°C for 1 hour, and then left to stand at room temperature for 8 hours to obtain the environmentally friendly antibacterial water-soluble coolant.

[0066] Example 3

[0067] An environmentally friendly, antibacterial, water-soluble coolant, wherein the formula 3 of the water-soluble coolant is as follows (by weight percentage): 50% environmentally friendly composite oil, 8% dicyclohexylamine, 5% fatty alcohol polyoxyethylene ether, 5% modified graphene nanofluid, 3.5% ethylene glycol butyl ether, 1% triethanolamine, 1% AMP95 terephthalamide, 1.2% alcohol ether carboxylic acid, 0.6% dodecanoic acid, 0.4% benzotriazole, 0.3% silicone defoamer, and the balance being deionized water.

[0068] The preparation method of the environmentally friendly compound oil is as follows:

[0069] S1-1: Mix 30 parts by weight of castor oil and tall oil, with a mass ratio of castor oil to tall oil of 3:1, and stir at 700 r / min for 30 min at 50°C. Add 30 parts by weight of naphthenic base oil, increase the speed to 900 r / min and continue stirring at 50°C for 30 min to obtain the mixed oil.

[0070] S1-2: Add 5 parts by weight of vanillin to 60 parts by weight of anhydrous ethanol, sonicate for 30 min, add 0.5 parts by weight of emulsifier OP-10, continue sonicating for 10 min, then add mixed oil, and stir at 850 r / min at 60℃ for 1 h to obtain the environmentally friendly composite oil.

[0071] As a preferred embodiment of the present invention, the preparation method of the modified graphene nanofluid is as follows:

[0072] S2-1: Graphene oxide was ball-milled for 1.5 h at a speed of 300 r / min under high-purity nitrogen protection. Then, 15 parts by weight of the ball-milled graphene oxide were added to 100 parts by weight of anhydrous ethanol and sonicated at 70 °C for 3 h at a power of 10 kW. The mixture was then centrifuged in a high-speed centrifuge for 20 min at a speed of 10000 r / min to obtain solution A.

[0073] S2-2: 10 parts by weight of polyethylene glycol were added to solution A and stirred at 750 r / min for 2 h at 55 °C. Then, phosphate ester was added, with the amount of phosphate ester added being 5% of the mass of solution A. The temperature was raised to 80 °C and stirred at 700 r / min for 1.5 h to obtain the modified graphene nanofluid.

[0074] A method for preparing an environmentally friendly, antibacterial, water-soluble coolant, the specific steps of which are as follows:

[0075] According to Formula 3, the environmentally friendly composite oil, dicyclohexylamine, fatty alcohol polyoxyethylene ether, modified graphene nanofluid, ethylene glycol butyl ether, triethanolamine, AMP95 teramine, alcohol ether carboxylic acid, dodecanoic acid, benzotriazole, organosilicon defoamer and deionized water are mixed, homogenized at 50°C for 2 hours, and then left to stand at room temperature for 12 hours to obtain the environmentally friendly antibacterial water-soluble coolant.

[0076] Comparative Example 1

[0077] Castor oil is not added in the preparation of the environmentally friendly compound oil, and the remaining steps are the same as in Example 1.

[0078] Comparative Example 2

[0079] Vanillin alcohol is not added in the preparation of the environmentally friendly compound oil, and the remaining steps are the same as in Example 1.

[0080] Comparative Example 3

[0081] Without adding modified graphene nanofluid, the remaining steps are the same as in Example 1.

[0082] Performance testing

[0083] The antibacterial properties of the water-soluble coolants prepared in the examples and comparative examples were determined according to GB 15979-2002 standard. *Escherichia coli* and *Staphylococcus aureus* were used as indicator bacteria, with an initial bacterial concentration of 1 × 10⁻⁶. 6 The cfu / mL concentration was used to culture Escherichia coli at 37°C for 16 hours, and Staphylococcus aureus at 37°C for 24 hours.

[0084] The experimental data are summarized in the table below.

[0085]

[0086] As can be seen from the examples and comparative data, the coolant prepared by the present invention has good antibacterial properties.

[0087] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. An environmentally friendly, antibacterial, water-soluble coolant, characterized in that, The water-soluble coolant has the following formulation by weight percentage: 30%–50% environmentally friendly composite oil, 6%–8% dicyclohexylamine, 4%–5% surfactant, 3%–5% modified graphene nanofluid, 2.5%–3.5% ethylene glycol butyl ether, 1%–2% pH adjuster and stabilizer, 0.8%–1.2% alcohol ether carboxylate, 0.4%–0.6% dodecanoic acid, 0.2%–0.4% benzotriazole, 0.1%–0.3% organosilicon defoamer, and the balance being deionized water. The preparation method of the environmentally friendly compound oil is as follows: S1-1: Place 20-30 parts by weight of a mixture of castor oil and tall oil at 40-50°C and stir at 600-700 r / min for 30 min. The castor oil and tall oil are mixed in a mass ratio of (1-3):

1. Add 30 parts by weight of naphthenic base oil, increase the speed to 800-900 r / min and continue stirring at 40-50°C for 30 min to obtain a mixed oil. S1-2: Add 3-5 parts by weight of vanillin to 50-60 parts by weight of anhydrous ethanol, sonicate for 30 min, add 0.5 parts by weight of emulsifier OP-10, continue sonicating for 10 min, then add mixed oil, and stir at 750-850 r / min at 60℃ for 1 h to obtain the environmentally friendly composite oil. The modified graphene nanofluid is prepared as follows. S2-1: Place graphene oxide in a ball mill and ball mill for 1.5 h. The ball milling is carried out under the protection of high-purity nitrogen. Then, add 10-15 parts by weight of the ball-milled graphene oxide to 100 parts by weight of anhydrous ethanol and sonicate at 60-70℃ for 2-3 h with an ultrasonic power of 8-10 kW. Then, centrifuge in a high-speed centrifuge for 10-20 min to obtain solution A. S2-2: Add 5-10 parts by weight of polyethylene glycol to solution A, stir at 650-750 r / min at 45-55℃ for 1-2 h, then add phosphate ester, raise the temperature to 80℃ and stir at 600-700 r / min for 1.5 h to obtain the modified graphene nanofluid.

2. The environmentally friendly antibacterial water-soluble coolant according to claim 1, characterized in that, The pH adjusting stabilizer is a mixture of triethanolamine and AMP95 teramine in a mass ratio of 1:(1-2).

3. The environmentally friendly antibacterial water-soluble coolant according to claim 1, characterized in that, The surfactant is one or both of fatty alcohol polyoxyethylene ether and sodium fatty alcohol polyoxyethylene ether sulfate.

4. The environmentally friendly antibacterial water-soluble coolant according to claim 1, characterized in that, The ball milling speed in S2-1 is 200-300 r / min.

5. The environmentally friendly antibacterial water-soluble coolant according to claim 1, characterized in that, The speed of the high-speed centrifuge in S2-1 is set to 8000-10000 r / min.

6. The environmentally friendly antibacterial water-soluble coolant according to claim 1, characterized in that, The amount of phosphate ester added in S2-2 is 3% to 5% of the mass of solution A.

7. A method for preparing an environmentally friendly antibacterial water-soluble coolant as described in any one of claims 1 to 6, characterized in that, The specific steps of the preparation method are as follows: According to the formula ratio, the environmentally friendly composite oil, dicyclohexylamine, surfactant, modified graphene nanofluid, ethylene glycol butyl ether, pH adjusting stabilizer, alcohol ether carboxylate, dodecanoic acid, benzotriazole, organosilicon defoamer and deionized water are mixed, homogenized at 40-50℃ for 1-2 hours, and then left to stand at room temperature for 8-12 hours to obtain the environmentally friendly antibacterial water-soluble coolant.

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