Phosphorus-free and silicon-free environment-friendly aluminum alloy semi-synthetic cutting fluid as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of cutting processing, and discloses a phosphorus-free and silicon-free environment-friendly aluminum alloy semi-synthetic cutting fluid as well as a preparation method and application thereof. The phosphorus-free and silicon-free environment-friendly aluminum alloy semi-synthetic cutting fluid comprises the following components in parts by weight: 30-50 parts of base oil, 8-15 parts of an alkali storage agent, 2-5 parts of an aluminum alloy corrosion inhibitor, 5-10 parts of an antirust agent, 0.8-5 parts of a coupling agent, 5-10 parts of a lubricant, 3.5-10 parts of a surfactant, 1-4 parts of a bactericide and 0.05-0.2 part of a defoaming agent. The surfactant comprises oleyl alcohol polyether-12 carboxylic acid, polypropylene glycol diamine and epoxidized vegetable oleic acid in a mass ratio of 1: (1-4): (1.5-5). The phosphorus-free and silicon-free environment-friendly aluminum alloy semi-synthetic cutting fluid disclosed by the invention has excellent stability, lubricating property, corrosion resistance and defoaming property, can be applied to a cutting process of metal materials such as aluminum alloy and the like, and does not contain phosphorus and silicon elements; and the treatment cost of the cutting fluid waste liquid and potential hazards to water bodies, soil and ecological systems can be effectively reduced.

Description

Technical Field

[0001] The invention relates to the technical field of cutting processing, and discloses a phosphorus-free, silicon-free, environmentally friendly aluminum alloy semi-synthetic cutting fluid, a preparation method and application thereof. Background Art

[0002] Aluminum alloy has the characteristics of low density, high specific strength, good thermal conductivity, and good electromagnetic shielding performance. It is widely used in aerospace, national defense, biomedicine, electronics and other fields, and can meet the requirements of lightweight devices, energy saving, vibration reduction and noise reduction in the above fields. Due to the strong chemical activity of aluminum, it is easily corroded by acidic or alkaline solutions during processing. At the same time, aluminum alloy has some properties different from other metals. It is easy to produce built-up edge and strip cracks during cutting, which affects the processing accuracy and metal surface quality, reduces the strength and toughness of the workpiece, and affects the service life of the workpiece. In order to prevent the occurrence of the above problems, aluminum alloy cutting fluid must have excellent lubrication performance and stability.

[0003] At present, the existing aluminum alloy cutting fluid mainly uses phosphate corrosion inhibitors or organosiloxane corrosion inhibitors as the main corrosion inhibitors to improve the processing performance of the cutting fluid. However, the phosphate slow-release agent in the aluminum alloy cutting fluid is easy to breed bacteria, causing the cutting fluid to spoil and deteriorate; on the other hand, it will produce a large amount of phosphorus-nutrient industrial wastewater, which is easy to cause eutrophication pollution of water bodies, thereby increasing the treatment cost of cutting fluid waste and potential harm to water bodies, soil and ecosystems. At the same time, the organosiloxane corrosion inhibitor in the aluminum alloy cutting fluid has poor compatibility with the phosphate corrosion inhibitor. It is difficult to form a stable system in the cutting fluid and is easy to decompose and fail, thereby losing its corrosion inhibition performance. After use, it is easy to adhere to the surface of the aluminum alloy workpiece, hindering the formation and growth of the oxide film in the subsequent anodizing process of the aluminum alloy, reducing the anodizing efficiency of the aluminum alloy, and cannot provide effective protection for the long-term processing of the aluminum alloy in the aluminum alloy cutting fluid, thereby affecting the quality and service life of the aluminum alloy workpiece.

[0004] Therefore, it is urgent to develop an environmentally friendly and efficient new type of aluminum alloy semi-synthetic cutting fluid with excellent stability, lubrication, corrosion resistance and defoaming performance and whose waste liquid will not pollute the water environment. Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a phosphorus-free, silicon-free, environmentally friendly aluminum alloy semi-synthetic cutting fluid and a preparation method and application thereof.

[0006] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0007] In a first aspect, the present invention provides a phosphorus-free, silicon-free environmentally friendly aluminum alloy semi-synthetic cutting fluid, comprising the following components in parts by weight: 30-50 parts of base oil, 8-15 parts of alkali reserve agent, 2-5 parts of aluminum alloy corrosion inhibitor, 5-10 parts of rust inhibitor, 0.8-5 parts of coupling agent, 5-10 parts of lubricant, 3.5-10 parts of surfactant, 1-4 parts of bactericide and 0.05-0.2 parts of defoaming agent; the surfactant comprises oleyl alcohol polyether-12 carboxylic acid, polypropylene glycol diamine and epoxidized vegetable oil acid in a mass ratio of 1:(1-4):(1.5-5).

[0008] The aluminum alloy semi-synthetic cutting fluid obtained by compounding base oil, alkali reserve agent, aluminum alloy corrosion inhibitor, rust inhibitor, coupling agent, lubricant, surfactant, bactericide and defoamer has stability, lubrication, corrosion resistance and defoaming performance. Among them, oleyl alcohol polyether-12 carboxylic acid, polypropylene glycol diamine and epoxidized vegetable oil acid are compounded as surfactants to cooperate with other components to give the cutting fluid good stability, lubrication and corrosion resistance, so that it can still maintain stable lubrication and rust prevention effects under high or low temperature conditions; at the same time, the compounded aluminum alloy semi-synthetic cutting fluid can form a stable system, prevent the cutting fluid from settling or stratification, and ensure that the cutting fluid always maintains a uniform dispersion state during use. In addition, the cutting fluid compounded by the various components of the present invention not only meets the mechanical processing requirements of the material, but also significantly reduces the friction coefficient between the tool and the workpiece during the cutting process, reduces the cutting force and cutting heat, improves the cutting efficiency and tool life, and forms a uniform protective film in the cutting area, reduces the direct contact between the tool and the workpiece, and further reduces oxidation or corrosion; and the cutting fluid does not contain phosphorus and silicon elements, which can effectively reduce the treatment cost of cutting fluid waste and the potential harm to water bodies, soil and ecosystems.

[0009] As a preferred embodiment of the phosphorus-free, silicon-free environmentally friendly aluminum alloy semi-synthetic cutting fluid described in the present invention, it includes the following components in parts by weight: 35 parts of base oil, 10 parts of alkali reserve agent, 3 parts of aluminum alloy corrosion inhibitor, 8 parts of rust inhibitor, 2 parts of coupling agent, 8 parts of lubricant, 8 parts of surfactant, 2 parts of bactericide and 0.1 parts of defoaming agent.

[0010] As a preferred embodiment of the phosphorus-free, silicon-free environmentally friendly aluminum alloy semi-synthetic cutting fluid of the present invention, the mass ratio of oleyl alcohol polyether-12 carboxylic acid, polypropylene glycol diamine and epoxidized vegetable oil acid is 1:(2.5-3):(3-4).

[0011] The inventors studied the content ratio of each component in the aluminum alloy semi-synthetic cutting fluid and found that the content ratio of each component has a significant effect on the performance of the aluminum alloy semi-synthetic cutting fluid. When the mass ratio of oleyl alcohol polyether-12 carboxylic acid, polypropylene glycol diamine and epoxidized vegetable oil acid is 1:(2.5-3):(3-4), the obtained aluminum alloy semi-synthetic cutting fluid has better corrosion inhibition, lubrication, anti-foaming and stability.

[0012] As a preferred embodiment of the phosphorus-free, silicon-free environmentally friendly aluminum alloy semi-synthetic cutting fluid of the present invention, the epoxidized vegetable oleic acid includes epoxidized erucic acid, epoxidized ricinoleic acid and epoxidized coconut oleic acid; the mass ratio of the epoxidized erucic acid, epoxidized ricinoleic acid and epoxidized coconut oleic acid is 1:(4-8):(0.8-3).

[0013] As a preferred embodiment of the phosphorus-free, silicon-free environmentally friendly aluminum alloy semi-synthetic cutting fluid described in the present invention, the preparation method of the aluminum alloy corrosion inhibitor is: maleic anhydride, Z-9-octadecenoic acid-2-amino-2-methylpropanol and alkyl imidazoline are mixed and stirred to obtain the aluminum alloy corrosion inhibitor; the mass ratio of the maleic anhydride, Z-9-octadecenoic acid-2-amino-2-methylpropanol and alkyl imidazoline is (2-4):(5-7):1.

[0014] The aluminum alloy corrosion inhibitor selected by the present invention is a phosphorus-free and silicon-free corrosion inhibitor. Compared with traditional phosphate and silicone corrosion inhibitors, it is more environmentally friendly and has better corrosion inhibition performance; and it cooperates with other components to give the cutting fluid better stability, lubrication and corrosion resistance.

[0015] Preferably, the alkyl imidazoline is at least one of 2-methyl imidazoline, 2-ethyl imidazoline and 2-isopropyl imidazoline.

[0016] Preferably, the mass ratio of maleic anhydride, Z-9-octadecenoic acid-2-amino-2-methylpropanol and alkyl imidazoline is (2-4):6:1.

[0017] Preferably, the stirring temperature is 40°C-50°C.

[0018] As a preferred embodiment of the phosphorus-free, silicon-free environmentally friendly aluminum alloy semi-synthetic cutting fluid of the present invention, the coupling agent is at least one of ethylene glycol phenyl ether, propylene glycol phenyl ether, and dipropylene glycol butyl ether.

[0019] As a preferred embodiment of the phosphorus-free, silicon-free environmentally friendly aluminum alloy semi-synthetic cutting fluid of the present invention, the lubricant is at least one of polyglycerol-oleate, polyglycerol-polyricinoleate, polyglycerol-stearate, polyglycerol-palmitate and polyglycerol-caprylate.

[0020] As a preferred embodiment of the phosphorus-free, silicon-free environmentally friendly aluminum alloy semi-synthetic cutting fluid of the present invention, the alkali reserve agent is at least one of 1-(bis(3-(dimethylamino)propyl)amino)-2-propanol, 3-butoxypropylamine, and 3-amino-4-octanol.

[0021] As a preferred embodiment of the phosphorus-free, silicon-free environmentally friendly aluminum alloy semi-synthetic cutting fluid of the present invention, the rust inhibitor is N,N-di(2-ethylhexyl)-1H-methylbenzotriazole-1-methylamine and / or dialkyl-2,5-dimercapto-1,3,4-thiadiazole.

[0022] As a preferred embodiment of the phosphorus-free and silicon-free environmentally friendly aluminum alloy semi-synthetic cutting fluid of the present invention, the bactericide is at least one of N-octyl-4-isothiazoline-3-one, methylisothiazolinone, 4,5-dichloro-N-octyl-4-isothiazoline-3-one

[0023] In the second aspect, the present invention provides a method for preparing the phosphorus-free, silicon-free environmentally friendly aluminum alloy semi-synthetic cutting fluid, comprising the following steps: mixing the alkali reserve agent, rust inhibitor, and base oil and stirring evenly; adding the aluminum alloy corrosion inhibitor, coupling agent, lubricant, surfactant, and bactericide and stirring evenly; adding the defoaming agent and stirring to obtain the product.

[0024] In a third aspect, the present invention provides the use of the phosphorus-free, silicon-free environmentally friendly aluminum alloy semi-synthetic cutting fluid in the cutting processing of mechanical parts, medical equipment, and electronic equipment.

[0025] The aluminum alloy semi-synthetic cutting fluid of the present invention fully demonstrates its remarkable advantages in improving processing efficiency, protecting tools and workpieces, maintaining a clean processing environment, and extending the service life of the cutting fluid due to its excellent lubrication, rust prevention, stability, and environmental protection. It can effectively extend the service life of the tool during the cutting process of aluminum alloys and other materials, and protect the processing quality and subsequent use performance of the workpiece, and then be used to prepare mechanical parts, medical equipment, and electronic equipment.

[0026] Compared with the prior art, the beneficial effects of the present invention are as follows: first, the aluminum alloy semi-synthetic cutting fluid of the present invention has excellent stability, lubrication, corrosion resistance and defoaming performance, can effectively prevent the oxidation and corrosion of the workpiece during the processing, and ensure the processing quality and subsequent use performance of the workpiece; significantly reduce the cutting force and friction coefficient, reduce tool wear, improve processing efficiency and its surface finish; can quickly eliminate foam, keep the cutting fluid clean and effective; secondly, the aluminum alloy semi-synthetic cutting fluid of the present invention does not contain phosphorus and silicon elements, can effectively reduce the processing cost of cutting fluid waste and the potential harm to water bodies, soil and ecosystems; at the same time, the aluminum alloy semi-synthetic cutting fluid of the present invention does not need to be matched with other solvents, can be used directly after dilution and can meet the requirements of environmentally friendly phosphorus-free and silicon-free aluminum alloy semi-synthetic cutting fluid, and its storage stability is good and the service life is long. In addition, the preparation method of the aluminum alloy semi-synthetic cutting fluid of the present invention does not require special processes and equipment, is easy to operate, can realize industrial production, and meet large-scale processing needs. DETAILED DESCRIPTION

[0027] To better illustrate the purpose, technical solutions and advantages of the present invention, the present invention will be further described below in conjunction with specific embodiments. It should be understood by those skilled in the art that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0028] The following is an elaboration in conjunction with specific embodiments to illustrate the practical effects of the solutions of the present invention.

[0029] Unless otherwise specified, the experimental methods used in the examples are all conventional methods; the materials, reagents, equipment, etc. used, unless otherwise specified, can be obtained from commercial sources.

[0030] The raw materials used in the following examples and comparative examples are described as follows, but are not limited to these materials:

[0031] Table 1: Raw materials and manufacturers

[0032] raw material model factory Naphthenic Oil 1004 Panjin Mingyu Petrochemical Co., Ltd. Oleth-12 Carboxylic Acid AKYPO RCO15 KAO CHEMICALS EUROPE Polypropylene glycol diamine D400 HUNTSMAN Epoxidized erucic acid Crodamide ER-CH POWDER CRODA Epoxidized ricinoleic acid M06225 Shanghai Myril Biochemical Technology Co., Ltd. Epoxidized Coconut Oleic Acid PALMERA B1210 PAUMEL Polyether and polyacrylate 9928P Yangzhou Sixin New Materials Technology Co., Ltd. Silicone oxygen sustained release agent XP40 BASF Phosphate Ester Corrosion Inhibitor Vanlube 704S Vanderbilt Corporation

[0033] In the following embodiments and comparative examples, the preparation method of the aluminum alloy corrosion inhibitor involved is:

[0034] GYA aluminum alloy corrosion inhibitor: maleic anhydride, Z-9-octadecenoic acid-2-amino-2-methylpropanol and 2-ethylimidazoline are mixed and stirred at 50°C until there are no particles, and stirring is continued for 30 minutes to obtain; the mass ratio of maleic anhydride, Z-9-octadecenoic acid-2-amino-2-methylpropanol and 2-ethylimidazoline is 3:6:1.

[0035] GYB aluminum alloy corrosion inhibitor is obtained by mixing maleic anhydride, Z-9-octadecenoic acid-2-amino-2-methylpropanol and 2-methylimidazoline at 40° C. and stirring evenly until there are no particles, and continuing stirring for 30 minutes; the mass ratio of maleic anhydride, Z-9-octadecenoic acid-2-amino-2-methylpropanol and 2-methylimidazoline is 3:6:1.

[0036] The GYC aluminum alloy corrosion inhibitor is prepared by mixing maleic anhydride, Z-9-octadecenoic acid-2-amino-2-methylpropanol and 2-isopropylimidazoline at 40° C. and stirring evenly until there are no particles, and continuing stirring for 30 minutes; the mass ratio of the maleic anhydride, Z-9-octadecenoic acid-2-amino-2-methylpropanol and 2-isopropylimidazoline is 3:6:1.

[0037] In the following embodiments and comparative examples, the preparation method of the phosphorus-free, silicon-free environmentally friendly aluminum alloy semi-synthetic cutting fluid involved is: add the base oil into the reactor and mix it with the alkali reserve agent and the rust inhibitor and stir it evenly; add the aluminum alloy corrosion inhibitor, coupling agent, lubricant, and surfactant and stir them evenly; then add the bactericide and deionized water and stir for 30 minutes, and finally add the defoaming agent and stir for 1 hour.

[0038] The raw materials (by weight) of the phosphorus-free, silicon-free and environmentally friendly aluminum alloy semi-synthetic cutting fluids of the following embodiments and comparative examples are shown in Tables 1 and 2.

[0039] Table 2: Raw material ratios (parts by weight) of phosphorus-free, silicon-free environmentally friendly aluminum alloy semi-synthetic cutting fluid according to the present invention

[0040]

[0041]

[0042] Table 3: Raw material ratios (parts by weight) of the comparative example of the present invention, phosphorus-free, silicon-free environmentally friendly aluminum alloy semi-synthetic cutting fluid

[0043]

[0044]

[0045] Test example: Performance test of semi-synthetic cutting fluid for aluminum alloy

[0046] After the phosphorus-free and silicon-free environmentally friendly aluminum alloy semi-synthetic cutting fluids prepared in the examples and comparative examples were diluted with deionized water to a dilution with a mass fraction of 5%, their performance was tested.

[0047] (1) Stability test: 50 mL of the diluted solution of the phosphorus-free, silicon-free environmentally friendly aluminum alloy semi-synthetic cutting fluid of the above embodiments and comparative examples was placed in a constant temperature drying oven (70°C ± 3°C) for 5 h, taken out and cooled to 15°C ~ 35°C, left for 3 h, and then placed in a low temperature environment (-12°C ± 3°C) for 24 h. After being taken out and returned to room temperature for 1 h, there was no stratification, phase change and gelatinous state. After the test, it was able to return to its original state, indicating that the aluminum alloy semi-synthetic cutting fluid has good stability.

[0048] (2) Corrosion, rust prevention and defoaming performance test: The dilution liquid of the phosphorus-free and silicon-free environmentally friendly aluminum alloy semi-synthetic cutting fluid of the embodiment and the comparative example was subjected to corrosion, rust prevention and defoaming test using the test method of GB / T 6144 standard.

[0049] (3) Anti-wear performance test: The anti-wear performance of the diluted solutions of the phosphorus-free, silicon-free environmentally friendly aluminum alloy semi-synthetic cutting fluids of the embodiments and comparative examples was tested using the ASTM D4172 standard test method; the smaller the wear spot diameter, the better the anti-wear performance of the aluminum alloy semi-synthetic cutting fluid, which can protect the contact surface from wear for a longer period of time.

[0050] (4) Average torque test: The Microtap teast system was used to simulate the on-site processing process (using aluminum alloy plates, at room temperature, a rotation speed of 800 rpm, a maximum torque of 400 Ncm, and a tapping of 20 mm) to measure the average torque required for the dilution of the phosphorus-free, silicon-free environmentally friendly aluminum alloy semi-synthetic cutting fluid of the above-mentioned embodiment and comparative example during the cutting or deformation process of the metal processing process. The average torque reflects the magnitude of the interaction force between the tool and the workpiece during the cutting process. A smaller average torque means that the cutting process is smoother and the tool is subject to less resistance, which is conducive to reducing the cutting heat and cutting force during the cutting process, thereby reducing the risk of tool wear and workpiece deformation.

[0051] Table 4: Performance test results of phosphorus-free and silicon-free environmentally friendly aluminum alloy semi-synthetic cutting fluid

[0052]

[0053]

[0054] It can be seen from the data in Table 4 that the phosphorus-free, silicon-free environmentally friendly aluminum alloy semi-synthetic cutting fluid prepared by the embodiment of the present invention using the components of the specific content has excellent stability, can maintain a yellow transparent state for a long time, and does not delaminate, precipitate or deteriorate at high and low temperatures, and its pH value is stable between 9.12-9.23, which meets the use requirements of the cutting fluid; at the same time, its corrosion and rust resistance meet the GB / T 6144 standard and reach AB grade, which means that the phosphorus-free, silicon-free environmentally friendly aluminum alloy semi-synthetic cutting fluid of the embodiment of the present invention can effectively prevent aluminum alloy and other metals from being corroded and rusted during the processing; and its defoaming performance is excellent, and the defoaming time is 9s-15s. In addition, through the test of ASTM D4172 standard, the titanium alloy semi-synthetic cutting fluid of the embodiment of the present invention exhibits excellent wear resistance, and its wear spot diameter is 0.478mm-0.593mm, which proves that it can effectively reduce the wear of tools and workpieces during the cutting process; and when the Microtapteast system is used to simulate the on-site processing process, the average torque of the aluminum alloy semi-synthetic cutting fluid of the embodiment of the present invention is between 107.5Ncm-123.9Ncm.

[0055] Compared with Example 1, the surfactant of the aluminum alloy semi-synthetic cutting fluid of Comparative Examples 1-8 does not adopt the compound of oleyl alcohol polyether-12 carboxylic acid, polypropylene glycol diamine and epoxidized vegetable oil acid or the mass ratio thereof is not 1:(1-4):(1.5-5), so that the cutting fluid of Comparative Examples 1-8 has poor stability, poor wear resistance, poor lubrication performance and long defoaming time; the aluminum alloy corrosion inhibitor of Comparative Examples 9 and 10 adopts ordinary organic silicon oxygen sustained-release agent or phosphate corrosion inhibitor, which on the one hand makes the prepared aluminum alloy semi-synthetic cutting fluid have poor stability, poor wear resistance and poor lubrication performance; on the other hand, it is easy to produce industrial wastewater containing phosphorus or silicon elements, which needs to undergo a complicated treatment process to meet the emission standards, which not only increases the cost of waste liquid treatment, but also causes corrosion and damage to the treatment facilities.

[0056] It can be seen that the phosphorus-free, silicon-free environmentally friendly aluminum alloy cutting fluid made with the specific content components of the present invention has excellent stability, lubrication, corrosion resistance and defoaming performance, can effectively prevent oxidation and corrosion of aluminum alloy materials during processing, and ensure the processing quality and subsequent use performance of the materials; significantly reduce the cutting force and friction coefficient during processing, reduce tool wear, and improve processing efficiency and its surface finish; can quickly eliminate foam and keep the cutting fluid clean and effective; and does not contain phosphorus and silicon elements, which can effectively reduce the treatment cost of cutting fluid waste and the harm to the environment.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. A phosphorus-free, silicon-free, environmentally friendly aluminum alloy semi-synthetic cutting fluid, characterized in that: The invention comprises the following components in parts by weight: 30-50 parts of base oil, 8-15 parts of alkali reserve agent, 2-5 parts of aluminum alloy corrosion inhibitor, 5-10 parts of rust inhibitor, 0.8-5 parts of coupling agent, 5-10 parts of lubricant, 3.5-10 parts of surfactant, 1-4 parts of bactericide and 0.05-0.2 parts of defoamer; the surfactant comprises oleyl alcohol polyether-12 carboxylic acid, polypropylene glycol diamine and epoxidized vegetable oil acid in a mass ratio of 1:(1-4):(1.5-5).

2. The phosphorus-free, silicon-free environmentally friendly aluminum alloy semi-synthetic cutting fluid according to claim 1, characterized in that: The mass ratio of the oleth-12 carboxylic acid, polypropylene glycol diamine and epoxidized vegetable oleic acid is 1:(2.5-3):(3-4).

3. The phosphorus-free, silicon-free environmentally friendly aluminum alloy semi-synthetic cutting fluid according to claim 1, characterized in that: The epoxidized vegetable oleic acid comprises epoxidized erucic acid, epoxidized ricinoleic acid and epoxidized coconut oleic acid in a mass ratio of 1:(4-8):(0.8-3).

4. The phosphorus-free, silicon-free environmentally friendly aluminum alloy semi-synthetic cutting fluid according to claim 1, characterized in that: The preparation method of the aluminum alloy corrosion inhibitor is as follows: maleic anhydride, Z-9-octadecenoic acid-2-amino-2-methylpropanol and alkyl imidazoline are mixed and stirred to obtain the aluminum alloy corrosion inhibitor; the mass ratio of the maleic anhydride, Z-9-octadecenoic acid-2-amino-2-methylpropanol and alkyl imidazoline is (2-4):(5-7):

1.

5. The phosphorus-free, silicon-free environmentally friendly aluminum alloy semi-synthetic cutting fluid according to claim 4, characterized in that: The alkyl imidazoline is at least one of 2-methyl imidazoline, 2-ethyl imidazoline and 2-isopropyl imidazoline.

6. The phosphorus-free, silicon-free environmentally friendly aluminum alloy semi-synthetic cutting fluid according to claim 4, characterized in that: The stirring temperature is 40°C-50°C.

7. The phosphorus-free, silicon-free environmentally friendly aluminum alloy semi-synthetic cutting fluid according to claim 1, characterized in that: The coupling agent is at least one of ethylene glycol phenyl ether, propylene glycol phenyl ether and dipropylene glycol butyl ether.

8. The phosphorus-free, silicon-free, environmentally friendly aluminum alloy semi-synthetic cutting fluid according to claim 1, characterized in that: The lubricant is at least one of polyglycerol-oleate, polyglycerol-polyricinoleate, polyglycerol-stearate, polyglycerol-palmitate and polyglycerol-caprylate.

9. The method for preparing the phosphorus-free and silicon-free environmentally friendly aluminum alloy semi-synthetic cutting fluid according to any one of claims 1 to 8, characterized in that: The following steps are involved: The alkali reserve agent, rust inhibitor and base oil are mixed and stirred evenly; the aluminum alloy corrosion inhibitor, coupling agent, lubricant, surfactant and bactericide are added and stirred evenly; the defoaming agent is added and stirred to prepare the product.

10. Use of the phosphorus-free and silicon-free environmentally friendly aluminum alloy semi-synthetic cutting fluid according to any one of claims 1 to 8 in the cutting processing of mechanical parts, medical equipment, and electronic equipment.

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