Special cutting fluid for aluminum alloy and preparation method thereof

Abstract

The invention relates to the technical field of metal working fluids, in particular to a special cutting fluid for aluminum alloy and a preparation method thereof. The special cutting fluid for the aluminum alloy comprises the following components in parts by weight: 10-20 parts of a synthetic ester lubricant, 3-8 parts of a composite corrosion inhibitor, 5-12 parts of a surfactant, 2-5 parts of a coupling agent, 1-3 parts of a metal deactivator, 3-8 parts of a pH regulator, 0.5-2 parts of a preservative, 0.1-0.5 part of a defoaming agent and 50-80 parts of deionized water. The prepared cutting fluid can form a compact molecular protective film on the surface of the aluminum alloy, and pitting corrosion and discoloration phenomena caused by moisture, oxygen and machining stress are effectively prevented.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of metal processing fluid, in particular to a cutting fluid special for aluminum alloy and a preparation method thereof. BACKGROUND

[0002] Aluminum alloy is widely used in the fields of aerospace, automobile manufacturing, electronics and electrical appliances due to its excellent strength-to-weight ratio, good thermal conductivity and mechanical processing performance. However, there are some special problems in the mechanical processing of aluminum alloy materials, such as easy corrosion, easy scratches on the processed surface, and easy generation of built-up edge at high cutting temperature, which will affect the precision and surface quality of the processed workpiece.

[0003] The aluminum alloy cutting fluids on the market mainly have the following technical defects: (1) contradiction between corrosion resistance and environmental protection: traditional cutting fluids use sodium nitrite as a rust inhibitor, which has good rust prevention effect, but sodium nitrite is a recognized carcinogen, which is harmful to the health of operators and the environment. The rust prevention effect of environmentally friendly rust inhibitors on sensitive aluminum alloys is often not ideal. (2) poor lubricity and material compatibility: aluminum alloy materials are relatively soft, and excellent lubricity is needed to prevent built-up edge. However, traditional sulfur and chlorine extreme pressure additives can easily cause corrosion and stress corrosion cracking of aluminum alloy. (3) system compatibility problems: including poor aluminum chip separation, insufficient hard water adaptability, etc. Fine aluminum chips are easily suspended in the cutting fluid and are difficult to settle, and calcium and magnesium ions in high hardness water can easily react with cutting fluid components to form soap scum, blocking the pipeline.

[0004] In summary, the prior art cannot meet the demand for efficient processing while considering environmental protection and long-term stability, and there is an urgent need to develop a new type of cutting fluid special for aluminum alloy that can simultaneously solve the above technical problems. SUMMARY

[0005] In view of the problems in the prior art, the purpose of the present application is to provide a cutting fluid special for aluminum alloy and a preparation method thereof.

[0006] The purpose of the present application is achieved by adopting the following technical solutions: In a first aspect, the present application provides a cutting fluid special for aluminum alloy, which comprises the following components in terms of weight fraction: 10-20 parts of synthetic ester lubricant, 3-8 parts of composite corrosion inhibitor, 5-12 parts of surfactant, 2-5 parts of coupling agent, 1-3 parts of metal passivator, 3-8 parts of pH adjuster, 0.5-2 parts of preservative, 0.1-0.5 parts of defoamer and 50-80 parts of deionized water.

[0007] Preferably, the synthetic ester lubricant is at least one of pentaerythritol ester, trimethylolpropane ester, and neopentyl polyol ester.

[0008] Preferably, the composite corrosion inhibitor is a mixture of modified corrosion inhibitor and metal chelating agent, and the weight ratio of modified corrosion inhibitor to metal chelating agent is 3-5:1.

[0009] Preferably, the metal chelating agent is at least one of amino trimethylene phosphonic acid, hydroxyethylidene diphosphonic acid, diethylene triamine penta methylene phosphonic acid.

[0010] Preferably, the surfactant is compounded by non-ionic surfactant and anionic surfactant, and the weight ratio of non-ionic surfactant to anionic surfactant is 1-3:1.

[0011] Preferably, the non-ionic surfactant is fatty alcohol polyoxyethylene ether or alkyl glucoside, and the anionic surfactant is sodium petroleum sulfonate or fatty acid methyl ester sulfonate.

[0012] More preferably, the fatty alcohol polyoxyethylene ether is at least one of AEO-9, AEO-10, AEO-15, AEO-20.

[0013] More preferably, the alkyl glucoside is at least one of APG-0810, APG-0814, APG-1214, APG-0816, APG-1216.

[0014] More preferably, the molecular weight of the sodium petroleum sulfonate (T702) is 550.

[0015] More preferably, the fatty acid methyl ester sulfonate is at least one of MES-90, MES-86, MES-80, MES-70, MES-35.

[0016] Preferably, the coupling agent is an alcohol ether compound, including at least one of propylene glycol methyl ether, dipropylene glycol methyl ether or tripropylene glycol methyl ether.

[0017] Preferably, the metal passivator is at least one of sodium molybdate, sodium tungstate, sodium phytate.

[0018] Preferably, the pH regulator is triethanolamine.

[0019] Preferably, the preservative is isothiazolinone.

[0020] Preferably, the defoaming agent is an organic silicon defoaming agent, specifically at least one of AFE-1247, AFE-1267, AF-8014, AFE-3168.

[0021] Preferably, the preparation method of the modified corrosion inhibitor comprises: S1, weigh 4,4'-diaminodiphenyl sulfone and N,N-dimethylformamide, mix under the protection of nitrogen, set the temperature to 55-65℃, stir until dissolved, then cool to 40℃, add phthalic anhydride, then remove the oil bath, continue to stir at room temperature for 10-15h, after the reaction is completed, aftertreatment is carried out, the amide acid intermediate is obtained; S2, weigh the amide acid intermediate and N,N-dimethylformamide into a three-necked flask, stir and heat to 35-45℃ until completely dissolved, add 2-aminobenzimidazole, stir uniformly, then add EDC·HCl and DMAP, maintain the reaction temperature at 25-40℃ under the protection of nitrogen, stir for 6-8h, after the reaction is completed, aftertreatment is carried out, the modified corrosion inhibitor is obtained.

[0022] Preferably, the mass ratio of 4,4'-diaminodiphenyl sulfone and phthalic anhydride is 2.48:2.96-3.7.

[0023] Preferably, the mass ratio of the amide acid intermediate and 2-aminobenzimidazole is 1:2.54-2.75.

[0024] Preferably, the mass ratio of EDC·HCl (1-ethyl-(3-dimethylaminopropyl) carbodiimide hydrochloride), DMAP (4-dimethylaminopyridine) and 2-aminobenzimidazole is 4.13-4.32:0.35-0.58:2.54-2.75.

[0025] In a second aspect, the application provides a preparation method of a special cutting fluid for aluminum alloy, comprising the following steps: Step 1, add deionized water into a container, stir at a speed of 300-500 rpm, add metal passivator and metal chelating agent in sequence, heat to 40-50℃, stir until completely dissolved, to obtain an aqueous phase; Step 2, in another container, add synthetic ester lubricant, modified corrosion inhibitor and surfactant, heat to 50-60℃, stir to fully mix the components, to obtain an oil phase; Step 3, slowly add the oil phase of step 2 into the aqueous phase of step 1, control the adding speed to fully emulsify the system, adjust the stirring speed to 500-2500 rpm, stir for 30-45min, to form a uniform emulsion; Step 4, cool the emulsion to 35-45℃, add coupling agent and preservative in sequence, after uniform dispersion, reduce the temperature to below 30℃, add pH regulator and defoaming agent, continue to stir for 30min, to obtain the special cutting fluid for aluminum alloy.

[0026] The application has the following beneficial effects: 1. The cutting fluid prepared by the present application can form a dense molecular protective film on the surface of aluminum alloy, effectively preventing pitting and discoloration caused by moisture, oxygen and machining stress. Among them, synthetic esters such as pentaerythritol ester and trimethylolpropane ester are selected as base lubricants, and metal passivators such as sodium molybdate and sodium tungstate are used, and a modified corrosion inhibitor and a metal chelating agent are compounded to obtain a composite corrosion inhibitor, and through the reasonable compounding of alcohol ether coupling agent and APG, AEO series non-ionic surfactant, excellent protection performance is provided for aluminum alloy.

[0027] 2. The modified corrosion inhibitor molecule in the present application takes diphenyl sulfone as the core skeleton, and connects phthalimide and benzimidazole ring system on both sides through amide bond to form an expanded conjugated system. The aromatic ring is connected through amide bond to maintain moderate molecular flexibility, so that the corrosion inhibitor molecule can adapt to the microtopography of the surface of aluminum alloy, and the space steric hindrance effect of the large molecular structure and aromatic ring can effectively block the penetration of corrosive medium and enhance the density of the protective film.

[0028] 3. The preparation process of the modified corrosion inhibitor is: first, the anhydride bond of phthalic anhydride is subjected to nucleophilic attack by the primary amine group of 4,4'-diaminodiphenyl sulfone to generate a linear amic acid intermediate with a carboxyl group at the end. Then under the catalysis of EDC·HCl and DMAP, the carboxyl group of the amic acid intermediate and the primary amine group of 2-aminobenzimidazole undergo dehydration condensation to form a stable amide bond, thereby introducing a benzimidazole group.

[0029] 4. The composite corrosion inhibitor in the present application builds a comprehensive metal protection system through the functional complementation and synergistic effect of the modified corrosion inhibitor and the metal chelating agent. Among them, the modified corrosion inhibitor serves as the main framework of the protection system, and is adsorbed on the high-energy active points on the metal surface through a physical-chemical dual adsorption mechanism, ensuring the stability and durability of the protective film; the metal chelating agent can form stable complexes with calcium, magnesium, iron and other metal ions in water, preventing these ions from depositing on the surface of aluminum alloy to form micro-batteries and accelerate corrosion, and the phosphoric acid group can also interact with the aluminum surface oxide film to enhance its density. DETAILED DESCRIPTION

[0030] The technical solutions of the present application are described below through specific examples. It should be understood that the one or more method steps mentioned in the present application do not exclude other method steps before and after the combination steps or other method steps inserted between the explicitly mentioned steps; it should also be understood that these examples are only used to illustrate the present application and do not limit the scope of the present application. Moreover, unless otherwise stated, the numbering of each method step is only a convenient tool to identify each method step, and is not a limitation on the arrangement order of each method step or a limitation on the scope of the present application that can be implemented. The change or adjustment of the relative relationship without substantial change of the technical content is also regarded as the scope of the present application that can be implemented.

[0031] For a better understanding of the above technical solutions, the exemplary embodiments of the present application are described in more detail below. Although exemplary embodiments of the present application are shown, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present application can be more thoroughly and completely conveyed to those skilled in the art, and the scope of the present application can be fully conveyed to those skilled in the art.

[0032] The present application is further described below in conjunction with the following examples.

[0033] Example 1 A cutting fluid special for aluminum alloy, comprising the following components in parts by weight: 15 parts of synthetic ester lubricant, 5 parts of composite corrosion inhibitor, 8 parts of surfactant, 3 parts of coupling agent, 2 parts of metal passivator, 5 parts of pH regulator, 1.5 parts of preservative, 0.3 parts of defoamer and 60 parts of deionized water.

[0034] The synthetic ester lubricant is pentaerythritol tetraoleate (PETO).

[0035] The composite corrosion inhibitor is a mixture of modified corrosion inhibitor and amino trimethylene phosphonic acid, and the weight ratio of modified corrosion inhibitor to metal chelating agent is 4:1.

[0036] The surfactant is compounded by non-ionic surfactant AEO-9 and anionic surfactant MES-90, and the weight ratio of non-ionic surfactant to anionic surfactant is 2:1.

[0037] The coupling agent is propylene glycol methyl ether; the metal passivator is sodium molybdate; the pH regulator is triethanolamine; the preservative is isothiazolinone; and the defoamer is an organic silicon defoamer, specifically AFE-1247.

[0038] The preparation method of the modified corrosion inhibitor comprises: S1, take 2.48g 4,4'-diamino diphenyl sulfone and 20mL N,N-dimethylformamide (DMF) into a three-necked flask, and then put the three-necked flask into an oil bath, set the temperature to 60℃ under the protection of nitrogen, stir until the diamine is completely dissolved, then cool to 40℃, gradually add 3.16g phthalic anhydride in multiple times within 2h, control the system temperature ≤50℃, after the addition is completed, remove the oil bath, continue to stir at room temperature for 12h, the reaction system will gradually thicken, and a large amount of white solid will be generated, slowly pour the reaction liquid into a beaker containing 30mL ice water mixture and 2mL concentrated hydrochloric acid, stir vigorously until no more white precipitate is generated, filter, wash the filter cake with deionized water until the washing liquid is neutral, transfer the wet filter cake to a watch glass, and dry in a 60℃ vacuum drying oven for 12h to obtain a white powder, which is an amide acid intermediate; S2, take 1g amide acid intermediate and 20mL N,N-dimethylformamide (DMF) into a three-necked flask, stir and heat to 40℃ until completely dissolved, add 2.67g 2-aminobenzimidazole, stir uniformly, then add 4.24g EDC·HCl (1-ethyl-(3-dimethylaminopropyl) carbodiimide hydrochloride) and 0.43g DMAP (4-dimethylaminopyridine), maintain the reaction temperature at 35℃ under the protection of nitrogen, stir for 7h, after the reaction is completed, pour the reaction mixture into cold water, stir for 1h, and then a light yellow precipitate is generated, filter, wash with deionized water 4 times, then wash with methanol 2 times, dry the solid product in a 50℃ vacuum drying oven for 18h to obtain a modified corrosion inhibitor.

[0039] The preparation method of the cutting fluid special for aluminum alloy includes the following steps: Step 1, add deionized water to a container, stir at a speed of 400 rpm, add metal passivator and metal chelating agent in sequence, heat to 45℃, and stir until completely dissolved to obtain an aqueous phase; Step 2, in another container, add synthetic ester lubricant, modified corrosion inhibitor and surfactant, heat to 55℃, and stir to fully mix the components to obtain an oil phase; Step 3, slowly add the oil phase of step 2 to the aqueous phase of step 1, control the addition speed to fully emulsify the system, adjust the stirring speed to 2000 rpm, and stir for 35min to form a uniform emulsion; Step 4, cool the emulsion to 40℃, add coupling agent and preservative in sequence, disperse uniformly, then reduce the temperature to below 30℃, add pH regulator and defoaming agent, and continue to stir for 30min to obtain the cutting fluid special for aluminum alloy.

[0040] Example 2 A cutting fluid special for aluminum alloy, according to weight fraction, includes the following components: 10 parts of synthetic ester lubricant, 3 parts of composite corrosion inhibitor, 5 parts of surfactant, 2 parts of coupling agent, 1 part of metal passivator, 3 parts of pH regulator, 0.5 parts of preservative, 0.1 parts of defoamer and 50 parts of deionized water.

[0041] The synthetic ester lubricant is trimethylolpropane trioleate (TMPTO).

[0042] The composite corrosion inhibitor is a mixture of modified corrosion inhibitor (prepared according to the same method as in Example 1) and hydroxyethylidene diphosphonic acid, and the weight ratio of the modified corrosion inhibitor to the metal chelating agent is 3:1.

[0043] The surfactant is obtained by compounding non-ionic surfactant APG-1214 and anionic surfactant MES-86, and the weight ratio of the non-ionic surfactant to the anionic surfactant is 1:1.

[0044] The coupling agent is dipropylene glycol methyl ether; the metal passivator is sodium tungstate; the pH regulator is triethanolamine; the preservative is isothiazolinone; and the defoamer is an organic silicon defoamer, specifically AFE-1267.

[0045] The preparation method of the above-mentioned special cutting fluid for aluminum alloy includes the following steps: Step 1: Add deionized water in a container, stir at a speed of 300 rpm, and then add a metal passivator and a metal chelating agent in sequence, heat to 40℃, and stir until completely dissolved to obtain an aqueous phase; Step 2: In another container, add a synthetic ester lubricant, a modified corrosion inhibitor and a surfactant, heat to 50℃, and stir to fully mix the components to obtain an oil phase; Step 3: Slowly add the oil phase of Step 2 into the aqueous phase of Step 1, control the adding speed to fully emulsify the system, adjust the stirring speed to 1500 rpm, and stir for 30 min to form a uniform emulsion; Step 4: Cool the emulsion to 35℃, add a coupling agent and a preservative in sequence, disperse uniformly, then reduce the temperature to below 30℃, add a pH regulator and a defoamer, and continuously stir for 30 min to obtain a special cutting fluid for aluminum alloy.

[0046] Example 3 A special cutting fluid for aluminum alloy, according to weight parts, includes the following ingredients: 20 parts of synthetic ester lubricant, 8 parts of composite corrosion inhibitor, 12 parts of surfactant, 5 parts of coupling agent, 3 parts of metal passivator, 8 parts of pH regulator, 2 parts of preservative, 0.5 parts of defoamer and 80 parts of deionized water.

[0047] The synthetic ester lubricant is neopentyl glycol diheptanoate.

[0048] The complex corrosion inhibitor is a mixture of modified corrosion inhibitor (prepared according to the same method as in Example 1) and diethylene triamine penta methylene phosphonic acid, and the weight ratio of the modified corrosion inhibitor to the metal chelating agent is 5:1.

[0049] The surfactant is a mixture of non-ionic surfactant AEO-15 and anionic surfactant sodium petroleum sulfonate (T702), and the weight ratio of the non-ionic surfactant to the anionic surfactant is 1-3:1.

[0050] The coupling agent is tripropylene glycol methyl ether; the metal deactivator is sodium phytate; the pH regulator is triethanolamine; the preservative is isothiazolinone; and the defoaming agent is an organic silicon defoaming agent, specifically AFE-3168.

[0051] The preparation method of the aluminum alloy special cutting fluid comprises the following steps: Step 1: Add deionized water to a container, stir at a speed of 500 rpm, and then add a metal deactivator and a metal chelating agent, heat to 50°C, and stir until completely dissolved to obtain an aqueous phase; Step 2: In another container, add synthetic ester lubricant, modified corrosion inhibitor, and surfactant, heat to 60°C, and stir to fully mix the components to obtain an oil phase; Step 3: Slowly add the oil phase of Step 2 to the aqueous phase of Step 1, control the addition speed to fully emulsify the system, adjust the stirring speed to 2500 rpm, and stir for 45 min to form a uniform emulsion; Step 4: Cool the emulsion to 45°C, add a coupling agent and a preservative, disperse uniformly, then reduce the temperature to below 30°C, add a pH regulator and a defoaming agent, and continue stirring for 30 min to obtain an aluminum alloy special cutting fluid.

[0052] Example 4 An aluminum alloy special cutting fluid, which is different from Example 1 only in the preparation method of the modified corrosion inhibitor.

[0053] The preparation method of the modified corrosion inhibitor comprises: S1, 2.48 g of 4,4'-diaminodiphenyl sulfone and 20 mL of N,N-dimethylformamide (DMF) were weighed into a three-necked flask, which was then placed in an oil bath, and the temperature was set to 65°C under the protection of nitrogen. The diamine was stirred until it was completely dissolved, and then the temperature was lowered to 40°C. 3.7 g of phthalic anhydride was gradually added in multiple portions within 2 h, and the temperature of the system was controlled to be ≤50°C. After the addition was completed, the oil bath was removed, and the reaction was continued to be stirred at room temperature for 15 h. The reaction system gradually became thick, and a large amount of white solid was generated. The reaction liquid was slowly poured into a beaker containing 30 mL of an ice water mixture and 2 mL of concentrated hydrochloric acid, and was stirred vigorously until no more white precipitate was generated. Filtration was performed, the filter cake was washed with deionized water until the washing liquid was neutral, the wet filter cake was transferred to a surface dish, and was dried in a vacuum drying oven at 70°C for 12 h to obtain a white powder, which was an amide acid intermediate; S2, 1 g of the amide acid intermediate and 20 mL of N,N-dimethylformamide (DMF) were weighed into a three-necked flask, which was stirred and heated to 40°C until it was completely dissolved. 2.75 g of 2-amino benzimidazole was added, and after being uniformly stirred, 4.32 g of EDC·HCl (1-ethyl-(3-dimethylaminopropyl) carbodiimide hydrochloride) and 0.58 g of DMAP (4-dimethylamino pyridine) were added. The reaction temperature was maintained at 40°C under the protection of nitrogen, and the reaction was stirred for 8 h. After the reaction was completed, the reaction mixture was poured into cold water, and was stirred for 1 h. A light yellow precipitate was generated, and was filtered. The solid product was dried in a vacuum drying oven at 50°C for 24 h to obtain a modified corrosion inhibitor.

[0054] Example 5 A cutting fluid special for aluminum alloy, which is different from example 1 only in the preparation method of the modified corrosion inhibitor.

[0055] The preparation method of the modified corrosion inhibitor comprises: S1, 2.48 g of 4,4'-diaminodiphenyl sulfone and 20 mL of N,N-dimethylformamide (DMF) were weighed into a three-necked flask, which was then placed in an oil bath, and the temperature was set to 65°C under the protection of nitrogen. The diamine was stirred until it was completely dissolved, and then the temperature was lowered to 40°C. 3.7 g of phthalic anhydride was gradually added in multiple portions within 2 h, and the temperature of the system was controlled to be ≤50°C. After the addition was completed, the oil bath was removed, and the reaction was continued to be stirred at room temperature for 15 h. The reaction system gradually became thick, and a large amount of white solid was generated. The reaction liquid was slowly poured into a beaker containing 30 mL of an ice water mixture and 2 mL of concentrated hydrochloric acid, and was stirred vigorously until no more white precipitate was generated. Filtration was performed, the filter cake was washed with deionized water until the washing liquid was neutral, the wet filter cake was transferred to a surface dish, and was dried in a vacuum drying oven at 70°C for 12 h to obtain a white powder, which was an amide acid intermediate; S2, 1 g of amide acid intermediate and 20 mL of N, N-dimethylformamide (DMF) were weighed into a three-necked flask, stirred and heated to 40°C until completely dissolved, 2.54 g of 2-amino benzimidazole was added, after stirring evenly, 4.13 g of EDC-HCl (1-ethyl-(3-dimethylaminopropyl) carbodiimide hydrochloride) and 0.35 g of DMAP (4-dimethylaminopyridine) were added, the reaction temperature was maintained at 25°C under nitrogen protection, and the reaction was stirred for 6 h. After the reaction was completed, the reaction mixture was poured into cold water and stirred for 1 h. A light yellow precipitate was separated out, suction filtered, washed with deionized water 4 times, and then washed with methanol 2 times. The solid product was dried in a vacuum drying oven at 50°C for 12 h to obtain the modified corrosion inhibitor.

[0056] Comparative Example 1 A cutting fluid special for aluminum alloy, which is only different from Example 1 in that the modified corrosion inhibitor is not added, and the composite corrosion inhibitor is completely replaced by aminotri (methylene) phosphonic acid.

[0057] Comparative Example 2 A cutting fluid special for aluminum alloy, which is only different from Example 1 in that the modified corrosion inhibitor is replaced by an amide acid intermediate (prepared in the same way as S1 in Example 1).

[0058] Comparative Example 3 A cutting fluid special for aluminum alloy, which is only different from Example 1 in that the enhanced corrosion inhibitor is replaced by 2-amino benzimidazole.

[0059] Experimental detection The performances of the cutting fluids special for aluminum alloy prepared in Example 1 and Comparative Examples 1-3 were detected and compared, including corrosion resistance, lubricity and stability. The corrosion resistance includes aluminum alloy liquid phase semi-immersion corrosion and cast iron rust resistance, and the detection standard refers to GB / T 6144-2010. The lubricity includes maximum non-galling load and aluminum alloy machining surface roughness, and the detection standard refers to GB / T 3142-2019. The stability is hard water stability, and the detection standard refers to GB / T 6144-2010.

[0060] Table 1 Performance of different cutting fluids

[0061] As shown in the detection results in Table 1, the cutting fluid of Example 1 exhibits excellent rust prevention effect, lubricating performance and stability, indicating that the rigid skeleton and multiple polarity groups of the modified corrosion inhibitor used therein can effectively protect the aluminum alloy material. In Comparative Example 1, the composite corrosion inhibitor is replaced by aminotri (methylene) phosphonic acid, but the aminotri (methylene) phosphonic acid only has good complexing property and weak corrosion resistance, resulting in the worst performance in the end; in Comparative Example 2, the modified corrosion inhibitor is replaced by an amide acid intermediate, and the performance is better than that of Comparative Example 1, but still significantly worse than that of Example 1; in Comparative Example 3, the modified corrosion inhibitor is replaced by a 2-aminobenzimidazole small molecule, which has certain corrosion inhibition, and the effect is better than that of Comparative Example 1 but worse than that of Comparative Example 2. In summary, it can be seen that the cutting fluid formula of Example 1 not only solves the traditional contradiction between corrosion resistance and environmental protection, lubricity and material compatibility, but also significantly improves the system compatibility of the cutting fluid in actual use, and exhibits overall and balanced excellent performance.

[0062] In the description of the present specification, the description referring to the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms should not be understood as necessarily referring to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and integrate different embodiments or examples described in the present specification.

[0063] Although the embodiments of the present application have been shown and described above, it should be understood that the above-described embodiments are exemplary and should not be construed as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above-described embodiments within the scope of the present application.

Claims

1. An aluminum alloy special cutting fluid, characterized by, The following ingredients are included according to the weight parts: 10-20 parts of synthetic ester lubricant, 3-8 parts of composite corrosion inhibitor, 5-12 parts of surfactant, 2-5 parts of coupling agent, 1-3 parts of metal passivator, 3-8 parts of pH regulator, 0.5-2 parts of preservative, 0.1-0.5 parts of defoaming agent and 50-80 parts of deionized water; The surfactant is obtained by compounding non-ionic surfactant and anionic surfactant; the composite corrosion inhibitor is a mixture of modified corrosion inhibitor and metal chelating agent, and the weight ratio of the modified corrosion inhibitor to the metal chelating agent is 3-5:

1.

2. The cutting fluid for aluminum alloy according to claim 1, characterized by The synthetic ester lubricant is at least one of pentaerythritol ester, trimethylolpropane ester and neopentyl polyol ester.

3. The cutting fluid for aluminum alloy according to claim 1, wherein The metal chelating agent is at least one of amino-trimethylene phosphonic acid, hydroxyethylidene diphosphonic acid and diethylene triamine penta-methylene phosphonic acid.

4. The cutting fluid for aluminum alloy according to claim 1, wherein The weight ratio of the non-ionic surfactant to the anionic surfactant is 1-3:1; the non-ionic surfactant is fatty alcohol polyoxyethylene ether or alkyl glucoside, and the anionic surfactant is sodium petroleum sulfonate or fatty acid methyl ester sulfonate.

5. The cutting fluid for aluminum alloy according to claim 1, wherein The coupling agent is an alcohol ether compound, including at least one of propylene glycol methyl ether, dipropylene glycol methyl ether or tripropylene glycol methyl ether; and the metal passivator is at least one of sodium molybdate, sodium tungstate and sodium phytate.

6. The cutting fluid for aluminum alloy according to claim 1, wherein The pH regulator is triethanolamine; the preservative is isothiazolinone; and the defoaming agent is an organic silicon defoaming agent, specifically at least one of AFE-1247, AFE-1267, AF-8014 and AFE-3168.

7. The cutting fluid for aluminum alloy according to claim 1, wherein The preparation method of the modified corrosion inhibitor comprises: S1, 4,4'-diamino diphenyl sulfone and N,N-dimethyl formamide are weighed and mixed, and under the protection of nitrogen, the temperature is set to 55-65 DEG C, and then stirred until dissolved, and then cooled to 40 DEG C, and then phthalic anhydride is added, and then the oil bath is removed, and the reaction is continued to stir at room temperature for 10-15 h, and after the reaction is completed, the amide acid intermediate is obtained after post-treatment; S2, the amide acid intermediate and N,N-dimethyl formamide are weighed and added to a three-necked flask, stirred and heated to 35-45 DEG C until completely dissolved, 2-amino benzimidazole is added, stirred uniformly, and then 1-ethyl-(3-dimethyl aminopropyl) carbodiimide hydrochloride and 4-dimethyl amino pyridine are added, and the reaction temperature is maintained at 25-40 DEG C under the protection of nitrogen, and the reaction is stirred for 6-8 h, and after the reaction is completed, the modified corrosion inhibitor is obtained after post-treatment.

8. The cutting fluid for aluminum alloy according to claim 7, characterized by The mass ratio of 4,4'-diamino diphenyl sulfone to phthalic anhydride is 2.48:2.96-3.7; and the mass ratio of the amide acid intermediate to 2-amino benzimidazole is 1:2.54-2.

75.

9. The cutting fluid for aluminum alloy according to claim 7, wherein The mass ratio of 1-ethyl-(3-dimethyl aminopropyl) carbodiimide hydrochloride, 4-dimethyl amino pyridine and 2-amino benzimidazole is 4.13-4.32:0.35-0.58:2.54-2.

75.

10. A method of producing the cutting fluid for aluminum alloy special use according to claim 1, characterized by, The following steps are included: Step 1, add deionized water to the container, stir at 300-500 rpm, add metal passivator and metal chelating agent in turn, heat to 40-50℃, stir until completely dissolved, get water phase; Step 2, in another container, add synthetic ester lubricant, modified corrosion inhibitor and surfactant, heat to 50-60℃, stir to mix the components thoroughly, get oil phase; Step 3, slowly add the oil phase of step 2 to the water phase of step 1, control the adding speed to fully emulsify the system, adjust the stirring speed to 500-2500 rpm, stir for 30-45 min, form a uniform emulsion; Step 4, cool the emulsion to 35-45℃, add coupling agent and preservative in turn, disperse uniformly, then reduce the temperature to below 30℃, add pH regulator and defoaming agent, continue stirring for 30 min, get aluminum alloy special cutting fluid.

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