A kind of micro-emulsified water-based cutting fluid for aluminum alloy and preparation method thereof

Abstract

The present invention belongs to the technical field of metalworking fluids, and specifically relates to a microemulsified water-based cutting fluid for aluminum alloys and a preparation method thereof. The microemulsified water-based cutting fluid for aluminum alloys described in the present invention is prepared from the following raw materials in parts by mass: 9 to 11.5 parts of synthetic ester, 3 to 4.5 parts of anti-wear agent, 2.5 to 4.5 parts of lubricant, 7 to 9 parts of rust inhibitor, 50 to 55 parts of emulsifier, 2 to 4 parts of pH regulator, 0.09 to 0.11 parts of bactericide, 0.4 to 0.5 parts of defoamer, and 30 to 35 parts of water. The present invention uses synthetic ester as the base oil, compounding zinc dialkyl dithiophosphate and triethanolamine borate with excellent lubrication properties, and the prepared microemulsified water-based cutting fluid has good lubrication properties and very high load-bearing capacity. According to the tribological performance evaluation, the maximum no-seizure load P B The value can reach 1020 N. The microemulsified water-based cutting fluid prepared by the present invention has excellent processing performance during the cutting of aluminum alloy workpieces, and is suitable for processing high-hardness aviation aluminum alloy workpieces.

Description

Technical Field

[0001] The invention belongs to the technical field of metalworking fluids, and in particular relates to a micro-emulsified water-based cutting fluid for aluminum alloy and a preparation method thereof. Background Art

[0002] Cutting is the most important processing method in mechanical manufacturing. During the cutting process, it is necessary to add an appropriate amount of cutting fluid between the tool and the workpiece to play the role of cooling, lubricating, rust prevention, cleaning, etc. In particular, the cooling and lubricating properties of the cutting fluid used in metal cutting determine the service life of the tool and the cutting effect of the workpiece surface.

[0003] Due to the high hardness of aviation aluminum alloy, a higher lubrication load capacity is required during processing, so the cutting fluid used is required to meet the heavy-load processing of aluminum alloy materials. At present, the cutting fluid for processing aviation aluminum alloy is still monopolized by the foreign market. There is a big gap between the existing domestic aluminum alloy cutting fluid and similar foreign products. The main problem is insufficient lubrication performance. In addition, there are also problems with poor corrosion resistance and defoaming properties for aluminum parts. These problems restrict the promotion and application of existing domestic aluminum alloy cutting fluids.

[0004] In response to market demand, the technological blockade of my country by major foreign oil companies, and the high prices of foreign heavy-load cutting fluid products, it is necessary to develop a domestic aviation aluminum alloy special cutting fluid with high load-bearing capacity and good lubrication performance to overcome the shortcomings of traditional aluminum alloy cutting fluids, such as insufficient lubricity and poor anti-corrosion performance for aluminum parts, thereby enhancing the advantages of domestic products.

[0005] Microemulsion is a new type of cutting fluid between emulsion and synthetic fluid. It is a metalworking fluid that has both the lubricity of emulsion and the excellent cleaning performance of full synthetic metalworking fluid. It has low cost and good lubrication and anti-rust properties. It is the main development direction of metalworking fluid in the future.

[0006] In the prior art, there are also many microemulsified cutting fluids for metal processing. For example, the Chinese patent with publication number CN113652292A discloses a method for preparing a microemulsified cutting fluid for machining aluminum alloys of aircraft engines. Sulfonated graphene is compounded with molybdenum disulfide, and the sulfonated graphene is coated on the surface of molybdenum disulfide, so that it has good lubricity and cooling performance. For another example, the Chinese patent with publication number CN112342075A discloses a microemulsified cutting fluid, which can improve the rust prevention, lubrication and corrosion inhibition performance during aluminum alloy machining by adding rust inhibitors, corrosion inhibitors and other ingredients. Although the metal cutting fluids in the prior art have good stability, lubricity and other characteristics, their tribological properties are poor and cannot cope with the machining of high-hardness aviation aluminum alloy workpieces.

[0007] Based on this, the present invention aims at the requirements of existing aviation aluminum alloy processing technology for water-based cutting fluid, and develops a special aluminum alloy water-based cutting fluid with high load-bearing and high lubrication performance, in order to improve the lubrication performance, corrosion resistance and friction performance of the cutting fluid. Summary of the invention

[0008] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a micro-emulsified water-based cutting fluid for aluminum alloys suitable for higher load processing, which has excellent lubrication, corrosion resistance and friction properties by optimizing and adjusting the raw materials and preparation process.

[0009] The invention also provides a method for preparing the micro-emulsified water-based cutting fluid for aluminum alloy.

[0010] In order to achieve the above technical objectives, the present invention adopts the following technical solutions:

[0011] A micro-emulsified water-based cutting fluid for aluminum alloy is prepared from the following raw materials in parts by weight: 9-11.5 parts of synthetic ester, 3-4.5 parts of anti-wear agent, 2.5-4.5 parts of lubricant, 7-9 parts of rust inhibitor, 50-55 parts of emulsifier, 2-4 parts of pH regulator, 0.09-0.11 parts of bactericide, 0.4-0.5 parts of defoaming agent and 30-35 parts of water.

[0012] Specifically, the synthetic ester is one or more of tetrapolyricinoleate, pentaerythritol oleate, trimethylolpropane oleate, trimethylolpropane coconut oleate, diisooctyl sebacate, neopentyl glycol oleate, and isooctyl stearate; the present invention improves the lubricity of the microemulsified cutting fluid by using the synthetic ester to replace the base oil in the conventional cutting fluid.

[0013] Specifically, the anti-wear agent is zinc dialkyl dithiophosphate.

[0014] Specifically, the lubricant includes oleic acid and triethanolamine borate, and the mass ratio of oleic acid to triethanolamine borate is 1:1-1:3, preferably 1:1-1:2.5; dialkyl zinc dithiophosphate (antiwear agent) has good lubrication and load-bearing capacity, and triethanolamine borate (lubricant) has good lubricity. The lubrication performance of the microemulsified water-based cutting fluid is improved by compounding the antiwear agent and the lubricant with synthetic ester, and at the same time, it has a high anti-wear extreme pressure synergistic effect.

[0015] Specifically, the rust inhibitor is sodium petroleum sulfonate, which is also used as an anionic surfactant.

[0016] Specifically, the emulsifier is a nonionic surfactant, including butyl ether compounds, octylphenol polyoxyethylene ether and Span.

[0017] Specifically, the butyl ether compound is one or more of diethylene glycol butyl ether, ethylene glycol butyl ether, and dipropylene glycol butyl ether, preferably diethylene glycol butyl ether.

[0018] Specifically, the Span is one or more of Span 20, Span 40, Span 60, and Span 80; preferably, Span 80.

[0019] Preferably, in the microemulsified water-based cutting fluid for aluminum alloy, the butyl ether compound is 14 to 15 parts, the octylphenol polyoxyethylene ether is 3 to 5 parts, and the Span is 36 to 38 parts.

[0020] The present invention compounds nonionic surfactant diethylene glycol butyl ether, octylphenol polyoxyethylene ether and Span 80 to achieve good emulsification and stabilization, so that each component is evenly and stably dispersed in water, and sedimentation, stratification, agglomeration and flocculation of effective ingredients are prevented, thereby improving the storage stability of the micro-emulsified water-based cutting fluid.

[0021] Specifically, the pH regulator is an organic alcohol amine, specifically one or more of diglycolamine, ethanolamine, diethanolamine, and triethanolamine; preferably ethanolamine; the present invention can further improve the pH stability of the cutting fluid by adding a pH regulator to the cutting fluid.

[0022] Specifically, the fungicide is 1,2-benzisothiazol-3-one.

[0023] Specifically, the defoaming agent is modified silicone oil, and the brand name is Mengqingxin MS575.

[0024] Specifically, the pH value of the cutting fluid is 8.0-10.0, preferably 8.5-9.5.

[0025] Furthermore, the present invention also provides a method for preparing a micro-emulsified water-based cutting fluid for aluminum alloy, comprising the following steps:

[0026] S1. Place the synthetic ester and the anti-wear agent in a reaction vessel, heat to 40-50° C., and stir evenly for 20-30 minutes to obtain emulsion A;

[0027] S2, add water to another reaction container, raise the temperature to 40-50°C; then add lubricant, maintain the temperature at 40-50°C, stir evenly for 10-20 minutes, then add defoamer, octylphenol polyoxyethylene ether, rust inhibitor in sequence, maintain the temperature at 40-50°C, stir evenly for 20-30 minutes, and obtain emulsion B;

[0028] S3. Add emulsion A to emulsion B, and then add butyl ether compound, Span, bactericide and pH adjuster in sequence, and adjust the pH to 8.0-9.5, maintain the temperature at 40-50°C, stir evenly for 20-30 minutes, and obtain a light yellow transparent solution, which is the cutting fluid.

[0029] Preferably, the mass ratio of the synthetic ester to the anti-wear agent in step S1 is (2-4):1.

[0030] Preferably, in step S2, the mass ratio of water to lubricant is (6-14):1; the mass ratio of defoamer, octylphenol polyoxyethylene ether, and rust inhibitor is 1:(6-12.5):(14-22.5); and the mass ratio of water to defoamer is (60-87.5):1.

[0031] Preferably, in step S3, the mass ratio of emulsion A to emulsion B is 1:(2-4).

[0032] Preferably, in step S3, the mass ratio of emulsion A, butyl ether compound and Span is 1:1:(2-3); the mass ratio of bactericide and pH regulator is 1:(20-45); the mass ratio of butyl ether compound and bactericide is (127-167):1.

[0033] Specifically, the synthetic ester in step S1 is one or more of tetrapolyricinoleate, pentaerythritol oleate, trimethylolpropane oleate, trimethylolpropane coconut oleate, diisooctyl sebacate, neopentyl glycol oleate, and isooctyl stearate; preferably, trimethylolpropane oleate or pentaerythritol oleate.

[0034] Specifically, the anti-wear agent in step S1 is zinc dialkyl dithiophosphate.

[0035] Specifically, in step S2, the lubricants used are oleic acid and triethanolamine borate, and the mass ratio of oleic acid to triethanolamine borate is 1:1 to 1:3, preferably 1:1 to 1:2.5.

[0036] Specifically, the defoaming agent in step S2 is modified silicone oil, and the brand is Mengqingxin MS575.

[0037] Specifically, the rust inhibitor in step S2 is sodium petroleum sulfonate.

[0038] Specifically, the butyl ether compound in step S3 is one or more of diethylene glycol butyl ether, ethylene glycol butyl ether, and dipropylene glycol butyl ether, preferably diethylene glycol butyl ether.

[0039] Specifically, the fungicide in step S3 is 1,2-benzisothiazol-3-one.

[0040] Specifically, the Span in step S3 is one or more of Span 20, Span 40, Span 60, and Span 80; preferably, it is Span 80.

[0041] Specifically, the pH adjuster in step S3 is an organic alcohol amine, which is one or more of diglycolamine, ethanolamine, diethanolamine, and triethanolamine; preferably ethanolamine.

[0042] Preferably, the micro-emulsified water-based cutting fluid for aluminum alloy can be diluted with water to form a working fluid for use.

[0043] Specifically, during dilution, the cutting fluid is diluted with water to a concentration of 5-20 wt % as a working fluid, preferably 5 wt %, 10 wt % or 20 wt %.

[0044] Furthermore, the present invention also provides the use of the micro-emulsified water-based cutting fluid for aluminum alloy in the process of metal cutting or grinding.

[0045] Specifically, the cutting object is one or more of aluminum alloy, steel, magnesium aluminum alloy, and zinc aluminum alloy; aluminum alloy is preferred.

[0046] Compared with the prior art, the advantages of the present invention are:

[0047] 1. The present invention uses synthetic ester as base oil, compounded with zinc dialkyl dithiophosphate and triethanolamine borate with excellent lubrication performance, and the prepared microemulsified water-based cutting fluid has good lubrication performance and high load-bearing capacity. The tribological performance evaluation shows that after the microemulsified water-based cutting fluid is prepared into a 5wt% dilution, the maximum no-seizure load P B The value can reach 1020N; the friction coefficient is below 0.1 under a load of 510N. When the dilution concentration of the cutting fluid is increased to 10wt%, the maximum no-seizure load P B The value can reach 1236N.

[0048] 2. Compared with well-known domestic and foreign brands on the market, the tapping torque values ​​of the micro-emulsified water-based cutting fluid prepared by the present invention for aluminum alloy are all smaller than those of Los (BRAR208), Fuchs (600), and Frank (AN81). This indicates that the micro-emulsified water-based cutting fluid prepared by the present invention has excellent processing performance during the cutting of aluminum alloy workpieces, and is suitable for the cutting of high-precision, high-hardness aviation aluminum alloy workpieces.

[0049] The preparation method of the invention is simple to operate, low in cost, does not require expensive experimental instruments and equipment, is easy to realize large-scale batch production, and has important application potential. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1This is a tapping torque diagram of the microemulsified cutting fluid of Examples 1 to 4 and Comparative Examples 1 to 3 of the present invention on an aluminum alloy workpiece;

[0051] Figure 2 The maximum non-seizure load P of the micro-emulsified cutting fluid of Examples 1 to 4, Example 6, Example 8 and Comparative Examples 1 to 3 on the aluminum alloy workpiece B Value test results;

[0052] Figure 3 The friction coefficient curves of Examples 1 to 4, Example 6, Example 8, Comparative Example 2 (Foshan (600)) and Comparative Example 1 (Lowe (BRAR 208)) are shown. DETAILED DESCRIPTION

[0053] The technical solutions in the embodiments of the present application are described clearly and completely below. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application. The number of parts in the following embodiments refers to the number of parts by weight, that is, the number of parts in the following embodiments corresponds to the number of grams.

[0054] Example 1

[0055] Example 1 provides a microemulsified water-based cutting fluid for aluminum alloy, which is prepared by the following steps:

[0056] S1. Add 10 parts of trimethylolpropane oleate and 4.5 parts of zinc dialkyl dithiophosphate into a flask, heat to 50°C, and stir evenly for 30 minutes to obtain emulsion A.

[0057] S2, add 30 parts of deionized water to another flask, heat to 50 ℃, then add 1 part of oleic acid and 2.5 parts of triethanolamine borate in sequence, keep the temperature at 50 ℃, stir evenly for 10 minutes, then add 0.5 part of defoamer (modified silicone oil, brand MS575 of Mengqingxin), 3.5 parts of octylphenol polyoxyethylene ether and 7 parts of sodium petroleum sulfonate in sequence, keep the temperature at 50 ℃, continue stirring for 30 minutes, and obtain Emulsion B;

[0058] S3. Pour emulsion A into emulsion B, and then add 14.2 parts of diethylene glycol butyl ether, 38 parts of Span 80, 0.1 parts of fungicide (1,2-benzisothiazol-3-one) and 2 parts of pH adjuster (ethanolamine) in sequence to obtain a mixed solution, adjust the pH of the mixed solution to 8.0, maintain the temperature at 50°C, continue stirring for 30 minutes, and obtain a light yellow, clear and transparent micro-emulsified water-based cutting fluid.

[0059] Water was added to the above micro-emulsified water-based cutting fluid to prepare a 5 wt % dilution for performance testing.

[0060] Performance test of the microemulsified cutting fluid prepared in Example 1:

[0061] 1. The tribological properties of the prepared cutting fluid were tested using a four-ball friction tester (MS-10A).

[0062] The steel ball used in the test is GCr15 bearing steel balls. The test conditions are room temperature, load 510N, speed 1450r / min, friction coefficient (COF) after 30min of long wear and maximum no-seizure load (P B value).

[0063] The wear spot diameter on the steel ball surface was tested using an XDS-0745D optical microscope and a MicroXAM 3D non-contact surface tester.

[0064] 2. Use the tapping torque test system to test the tapping torque value during the cutting or deformation process of metal processing.

[0065] The test workpiece is a 6082# aluminum alloy nut with an inner diameter of 3.7mm and a high-precision yellow titanium-plated extrusion tap with model number TTT_M4F-TINT. The test conditions are: speed 1200r / min.

[0066] Example 2

[0067] Example 2 provides a microemulsified water-based cutting fluid for aluminum alloy, which is prepared by the following steps:

[0068] S1. Add 11.5 parts of trimethylolpropane oleate and 5 parts of zinc dialkyl dithiophosphate into a flask, raise the temperature to 45°C, and stir evenly for 30 minutes to obtain emulsion A;

[0069] S2, add 30 parts of deionized water to another flask, heat to 45 ℃, then add 0.7 parts of oleic acid and 1.8 parts of triethanolamine borate in sequence, keep the temperature at 45 ℃, stir evenly for 10 minutes, then add 0.4 parts of defoamer (modified silicone oil, brand is MS575 of Mengqingxin), 3.7 parts of octylphenol polyoxyethylene ether and 7.5 parts of sodium petroleum sulfonate in sequence, keep the temperature at 45 ℃, continue stirring for 30 minutes, and obtain emulsion B;

[0070] S3. Pour emulsion A into emulsion B, and then add 14.5 parts of diethylene glycol butyl ether, 39 parts of Span 80, 0.1 parts of fungicide (1,2-benzisothiazol-3-one) and 3 parts of pH adjuster (ethanolamine) in sequence to obtain a mixed solution, adjust the pH of the mixed solution to 8.5, maintain the temperature at 45°C, continue stirring for 30 minutes, and obtain a light yellow, clear and transparent micro-emulsified water-based cutting fluid.

[0071] Water was added to the above microemulsified water-based cutting fluid to prepare a 5 wt % dilution for performance testing. The testing method and conditions were the same as those in Example 1.

[0072] Example 3

[0073] Example 3 provides a microemulsified water-based cutting fluid for aluminum alloy, which is prepared by the following steps:

[0074] S1. Add 9.5 parts of trimethylolpropane oleate and 3 parts of zinc dialkyl dithiophosphate into a flask, heat to 40°C, and stir evenly for 30 minutes to obtain emulsion A.

[0075] S2, add 30 parts of deionized water to another flask, heat to 40 ℃, then add 1.2 parts of oleic acid and 3 parts of triethanolamine borate in sequence, keep the temperature at 40 ℃, stir evenly for 10 minutes, then add 0.5 parts of defoamer (modified silicone oil, brand is MS575 of Mengqingxin), 4.2 parts of octylphenol polyoxyethylene ether and 8.4 parts of sodium petroleum sulfonate in sequence, keep the temperature at 40 ℃, continue stirring for 30 minutes, and obtain emulsion B;

[0076] S3. Pour emulsion A into emulsion B, and then add 14.5 parts of diethylene glycol butyl ether, 36 parts of Span 80, 0.1 parts of fungicide (1,2-benzisothiazol-3-one) and 4 parts of pH adjuster (ethanolamine) in sequence to obtain a mixed solution, adjust the pH of the mixed solution to 9.0, maintain the temperature at 40°C, continue stirring for 30 minutes, and obtain a light yellow, clear and transparent micro-emulsified water-based cutting fluid.

[0077] Water was added to the above microemulsified water-based cutting fluid to prepare a 5 wt % dilution for performance testing. The testing method and conditions were the same as those in Example 1.

[0078] Example 4

[0079] Example 4 provides a microemulsified water-based cutting fluid for aluminum alloy, which is prepared by the following steps:

[0080] S1. Add 10 parts of pentaerythritol oleate and 4.5 parts of zinc dialkyl dithiophosphate into a flask, raise the temperature to 50° C., and stir evenly for 30 minutes to obtain emulsion A;

[0081] S2, add 30 parts of deionized water to another flask, heat to 50 ℃, then add 1 part of oleic acid and 2.5 parts of triethanolamine borate in sequence, keep the temperature at 50 ℃, stir evenly for 10 minutes, then add 0.5 part of defoamer (modified silicone oil, brand MS575 of Mengqingxin), 3.5 parts of octylphenol polyoxyethylene ether and 7 parts of sodium petroleum sulfonate in sequence, keep the temperature at 50 ℃, continue stirring for 30 minutes, and obtain Emulsion B;

[0082] S3. Pour emulsion A into emulsion B, and then add 14.2 parts of diethylene glycol butyl ether, 38 parts of Span 80, 0.1 parts of fungicide (1,2-benzisothiazol-3-one) and 3 parts of pH adjuster (ethanolamine) in sequence to obtain a mixed solution, adjust the pH of the mixed solution to 9.5, maintain the temperature at 50°C, continue stirring for 30 minutes, and obtain a light yellow, clear and transparent micro-emulsified water-based cutting fluid.

[0083] Water was added to the above microemulsified water-based cutting fluid to prepare a 5 wt % dilution for performance testing. The testing method and conditions were the same as those in Example 1.

[0084] Example 5

[0085] Example 5 provides a micro-emulsified water-based cutting fluid for aluminum alloy, and the preparation method of the cutting lubricant is the same as that of Example 1. The difference between Example 5 and Example 1 is that when the cutting fluid of Example 5 is subjected to performance testing, the load of 510N in the test conditions is reduced to 392N, and other conditions remain unchanged.

[0086] Example 6

[0087] Example 6 provides a micro-emulsified water-based cutting fluid for aluminum alloys. The preparation method of the cutting lubricant is the same as that of Example 1. The difference between Example 6 and Example 1 is that water is added to the micro-emulsified cutting fluid to prepare a 10wt% dilution for performance testing. The test method and conditions are the same as those of Example 5.

[0088] Example 7

[0089] Example 7 provides a micro-emulsified water-based cutting fluid for aluminum alloy, and the preparation method of the cutting lubricant is the same as that of Example 1. The difference between Example 7 and Example 1 is that water is added to the micro-emulsified cutting fluid to prepare a 20wt% dilution for tribological performance testing. When the cutting fluid of Example 7 is tested for performance, the load of 510N in the test conditions is increased to 696N, and other conditions remain unchanged.

[0090] Example 8

[0091] Example 8 provides a micro-emulsified water-based cutting fluid for aluminum alloys. The preparation method of the cutting lubricant is the same as that of Example 4. The difference between Example 8 and Example 4 is that water is added to the micro-emulsified cutting fluid to prepare a 10wt% dilution for performance testing. The test method and conditions are the same as those of Example 1.

[0092] Comparative Example 1

[0093] Comparative Example 1 is a commercially available microemulsified cutting fluid Los (BRAR 208), which was diluted with water to a concentration of 5 wt % for performance testing. The testing method and conditions were the same as those in Example 1.

[0094] Comparative Example 2

[0095] Comparative Example 2 is a commercially available cutting fluid Fuchs (600), which was diluted with water to a concentration of 5 wt % for performance testing. The testing method and conditions are the same as those in Example 1.

[0096] Comparative Example 3

[0097] Comparative Example 3 is a commercially available cutting fluid Frank (AN81), which was diluted with water to a concentration of 5 wt % for performance testing. The testing method and conditions were the same as those in Example 1.

[0098] Performance Test Results

[0099] (I) The dilutions prepared by adding water to the microemulsified water-based cutting fluids prepared in Example 1, Example 2, Example 3, and Example 4, as well as Comparative Examples 1, 2, and 3 were tested for various indicators such as physical and chemical properties, rust prevention, and corrosion resistance. The test results are shown in Table 1.

[0100] Table 1

[0101]

[0102] As can be seen from Table 1, the anti-rust and anti-corrosion properties of the microemulsified water-based cutting fluids of Examples 1 to 4 and Comparative Examples 1 to 3 reach Class A, and have good comprehensive properties. The maximum no-seizure loads of Examples 1 to 4 are all greater than those of Comparative Examples 1 to 3, indicating that the cutting fluids prepared by the present invention have excellent lubrication load-bearing capacity.

[0103] (II) Friction performance test results:

[0104] 1. Figure 2 is the maximum no-seizure load P of the aluminum alloy workpiece in Examples 1 to 4, Example 6, Example 8 and Comparative Examples 1 to 3 B The test results show that the maximum no-seizure load P of each embodiment of the present invention is B The values ​​are all greater than those of the comparative example, indicating that the microemulsified water-based cutting fluid prepared by the present invention has a high lubrication load-bearing capacity.

[0105] Figure 3 The friction coefficient curves of Examples 1 to 4, Example 6, Example 8, Comparative Example 2 (Fuss (600)) and Comparative Example 1 (Loss (BRAR 208)) are shown. It can be seen that the friction coefficients of the various embodiments of the present invention are all lower than 0.09, and the friction coefficient of Comparative Example 1 (Loss (BRAR 208)) is comparable to that of the various embodiments of the present invention, and is also below 0.09. The friction coefficient of Comparative Example 2 (Fuss (600)) under the same test conditions is significantly higher than that of the various embodiments of the present invention, indicating that the microemulsified water-based cutting fluid prepared by the present invention has better lubrication performance.

[0106] 2. From Figure 1 From the test results of the tapping torque values, it can be seen that for aluminum alloy, the tapping torque values ​​of the microemulsified water-based cutting fluids prepared in Examples 1 to 4 are all lower than those in Comparative Examples 1 to 3, indicating that the processing performance of the cutting fluid prepared by the present invention on aluminum alloy is better than that of well-known domestic and foreign brands such as Los, Foss, and Frank.

[0107] 3. As shown in Table 2, the diameter of the wear spot is less than 0.6 mm in Examples 1 to 4, and the surface of the wear spot is smooth and flat, indicating that the prepared microemulsified water-based cutting fluid has excellent anti-wear performance. It can be seen from Examples 5 to 7 that increasing the concentration of the diluent or reducing the load will reduce the wear spot diameter to a certain extent.

[0108] Table 2

[0109] Example Example 1 Example 2 Example 3 Example 4 Friction spot diameter (mm) 0.560 0.510 0.576 0.541 Example Example 5 Example 6 Example 7 Example 8 Friction spot diameter (mm) 0.553 0.508 0.510 0.520

[0110] In summary, the present invention uses synthetic ester as the base oil, compounded with zinc dialkyl dithiophosphate and triethanolamine borate with excellent lubrication performance, and optimizes and adjusts the raw materials and the preparation process, so that the prepared microemulsified water-based cutting fluid has good lubrication performance and high load-bearing capacity.

[0111] Compared with well-known domestic and foreign brands on the market, the tapping torque values ​​of the micro-emulsified water-based cutting fluid prepared by the present invention for aluminum alloy are all smaller than those of Los (BRAR208), Fuchs (600), and Frank (AN81). This shows that the micro-emulsified water-based cutting fluid prepared by the present invention has excellent processing performance during the cutting of aluminum alloy workpieces, which indicates that the comprehensive performance of the micro-emulsified water-based cutting fluid of the present invention is significantly improved, and it is suitable for the processing of high-hardness aviation aluminum alloy workpieces, and has good application prospects.

[0112] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A microemulsified water-based cutting fluid for aluminum alloy, characterized in that: Prepared by the following steps: S1. Add 10 parts by mass of trimethylolpropane oleate and 4.5 parts by mass of zinc dialkyl dithiophosphate into a flask, raise the temperature to 50° C., and stir evenly for 30 minutes to obtain emulsion A; S2, add 30 parts by mass of deionized water to another flask, heat to 50 ° C, then add 1 part by mass of oleic acid and 2.5 parts by mass of triethanolamine borate in sequence, keep the temperature at 50 ° C, stir evenly for 10 minutes, then add 0.5 parts by mass of modified silicone oil defoamer with the brand of MS575 of Mengqingxin, 3.5 parts by mass of octylphenol polyoxyethylene ether and 7 parts by mass of sodium petroleum sulfonate in sequence, keep the temperature at 50 ° C, continue stirring for 30 minutes, and obtain Emulsion B; S3. Pour emulsion A into emulsion B, and then add 14.2 parts by mass of diethylene glycol butyl ether, 38 parts by mass of Span 80, 0.1 parts by mass of 1, 2-benzisothiazol-3-one fungicide and 2 parts by mass of ethanolamine pH regulator in sequence to obtain a mixed solution, adjust the pH of the mixed solution to 8.0, maintain the temperature at 50°C, and continue stirring for 30 minutes to obtain a light yellow, clear and transparent micro-emulsified water-based cutting fluid.

2. A microemulsified water-based cutting fluid for aluminum alloy, characterized in that: Prepared by the following steps: S1. Add 11.5 parts by mass of trimethylolpropane oleate and 5 parts by mass of zinc dialkyl dithiophosphate into a flask, raise the temperature to 45° C., and stir evenly for 30 minutes to obtain emulsion A; S2, add 30 parts by mass of deionized water to another flask, heat to 45 ° C, then add 0.7 parts by mass of oleic acid and 1.8 parts by mass of triethanolamine borate in sequence, keep the temperature at 45 ° C, stir evenly for 10 minutes, then add 0.4 parts by mass of modified silicone oil defoamer with the brand of MS575 of Mengqingxin, 3.7 parts by mass of octylphenol polyoxyethylene ether and 7.5 parts by mass of sodium petroleum sulfonate in sequence, keep the temperature at 45 ° C, continue stirring for 30 minutes, and obtain Emulsion B; S3. Pour emulsion A into emulsion B, and then add 14.5 parts by mass of diethylene glycol butyl ether, 39 parts by mass of Span 80, 0.1 parts by mass of 1, 2-benzisothiazol-3-one fungicide and 3 parts by mass of ethanolamine pH regulator in sequence to obtain a mixed solution, adjust the pH of the mixed solution to 8.5, maintain the temperature at 45°C, continue stirring for 30 minutes, and obtain a light yellow, clear and transparent micro-emulsified water-based cutting fluid.

3. A microemulsified water-based cutting fluid for aluminum alloy, characterized in that: Prepared by the following steps: S1. Add 9.5 parts by mass of trimethylolpropane oleate and 3 parts by mass of zinc dialkyl dithiophosphate into a flask, raise the temperature to 40° C., and stir evenly for 30 minutes to obtain emulsion A; S2, add 30 parts by mass of deionized water to another flask, heat to 40 ° C, then add 1.2 parts by mass of oleic acid and 3 parts by mass of triethanolamine borate in sequence, keep the temperature at 40 ° C, stir evenly for 10 minutes, then add 0.5 parts by mass of modified silicone oil defoamer with the brand of MS575 of Mengqingxin, 4.2 parts by mass of octylphenol polyoxyethylene ether and 8.4 parts by mass of sodium petroleum sulfonate in sequence, keep the temperature at 40 ° C, continue stirring for 30 minutes, and obtain Emulsion B; S3. Pour emulsion A into emulsion B, and then add 14.5 parts by mass of diethylene glycol butyl ether, 36 parts by mass of Span 80, 0.1 parts by mass of 1, 2-benzisothiazol-3-one fungicide and 4 parts by mass of ethanolamine pH regulator in sequence to obtain a mixed solution, adjust the pH of the mixed solution to 9.0, maintain the temperature at 40°C, and continue stirring for 30 minutes to obtain a light yellow, clear and transparent micro-emulsified water-based cutting fluid.

4. A microemulsified water-based cutting fluid for aluminum alloy, characterized in that: Prepared by the following steps: S1. Add 10 parts by mass of pentaerythritol oleate and 4.5 parts by mass of zinc dialkyl dithiophosphate into a flask, raise the temperature to 50° C., and stir evenly for 30 minutes to obtain emulsion A; S2, add 30 parts by mass of deionized water to another flask, heat to 50 ° C, then add 1 part by mass of oleic acid and 2.5 parts by mass of triethanolamine borate in sequence, keep the temperature at 50 ° C, stir evenly for 10 minutes, then add 0.5 parts by mass of modified silicone oil defoamer with the brand of MS575 of Mengqingxin, 3.5 parts by mass of octylphenol polyoxyethylene ether and 7 parts by mass of sodium petroleum sulfonate in sequence, keep the temperature at 50 ° C, continue stirring for 30 minutes, and obtain Emulsion B; S3. Pour emulsion A into emulsion B, and then add 14.2 parts by mass of diethylene glycol butyl ether, 38 parts by mass of Span 80, 0.1 parts by mass of 1, 2-benzisothiazol-3-one fungicide and 3 parts by mass of ethanolamine pH regulator in sequence to obtain a mixed solution, adjust the pH of the mixed solution to 9.5, maintain the temperature at 50°C, and continue stirring for 30 minutes to obtain a light yellow, clear and transparent micro-emulsified water-based cutting fluid.

5. Use of the micro-emulsified water-based cutting fluid for aluminum alloy according to any one of claims 1 to 4 in a metal cutting or grinding process.

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