Aviation aluminum alloy cutting fluid and preparation method thereof

Abstract

The invention provides an aviation aluminum alloy cutting fluid. The cutting fluid comprises the following components in parts by weight: 40-50 parts of base oil, 5-15 parts of an emulsifier, 5-15 parts of an oiliness agent, 2-8 parts of an antirust agent, 20-30 parts of distilled water, 2-8 parts of a base number retention agent, 1-5 parts of a hard water resistant agent, 0.5-2 parts of a corrosion inhibitor, 2-5 parts of a bactericide, 0.1-1 part of a coupling agent and 0.05-0.2 part of a defoaming agent, wherein the hard water resistant agent comprises alcohol ether carboxylic acid. The invention further provides a preparation method of the aviation aluminum alloy cutting fluid. The aviation aluminum alloy cutting fluid prepared from the components meets the machining requirements of cutting, milling, cutting and the like, the aluminum corrosion inhibition performance and the emulsion stability are good, and meanwhile the cutting fluid is good in biological stability and long in service life.

Description

Technical Field

[0001] The invention belongs to the technical field of lubricating oils, and in particular relates to an aviation aluminum alloy cutting fluid and a preparation method thereof. Background Art

[0002] Aviation aluminum alloy is the most widely used type of nonferrous metal structural material in industry. It has been widely used in aviation, aerospace, automobile, machinery manufacturing, shipbuilding and chemical industries due to its high specific strength, high specific stiffness, easy cutting and low density. Aluminum alloy has strong chemical activity, soft texture and strong viscosity. There are many problems in production and processing. The most common problems are cutting oil sticking to the tool and the workpiece oxidation and discoloration during cutting fluid processing to produce black spots. The use of metal cutting fluid can extend the life of the tool, improve the surface accuracy of the workpiece, reduce tool wear, and reduce the temperature of the cutting zone, thereby improving the efficiency of processing.

[0003] The common high-oil emulsions on the market have problems such as short service life, poor visibility during processing, easy corruption and odor, and difficult waste treatment. Fully synthetic cutting fluids have problems such as insufficient lubricity. The lubrication, cleaning and cooling properties of microemulsion cutting fluids are between those of emulsions and synthetic cutting fluids. It combines the advantages of emulsions and synthetic fluids, makes up for their shortcomings, and has excellent performance and strong versatility.

[0004] If the water used for liquid preparation has a high hardness and the concentration of calcium and magnesium ions in the water is high, the rust inhibitors and corrosion inhibitors in the cutting fluid will react with the calcium and magnesium ions in the hard water, resulting in precipitation, coagulation and precipitation, which will reduce the lubrication, rust prevention and corrosion resistance of the cutting fluid. At the same time, during the aluminum alloy processing process, the aluminum ions of the workpiece and the calcium ions in the water will complex with the anionic surfactants in the cutting fluid to form saponified products, which will also affect the normal use of the cutting fluid. Therefore, it is urgent to develop a semi-synthetic aluminum alloy cutting fluid with excellent aluminum corrosion resistance and emulsification stability in a hard water environment. Summary of the invention

[0005] In order to solve the above problems in the prior art, the present invention proposes an aviation aluminum alloy cutting fluid and a preparation method thereof, which has excellent aluminum corrosion resistance and emulsification stability not only in a hard water environment, but also in a more demanding aluminum sulfate solution environment.

[0006] To this end, in a first aspect, the present invention provides an aviation aluminum alloy cutting fluid, which comprises the following components, by weight: 40 to 50 parts of base oil, 5 to 15 parts of emulsifier, 5 to 15 parts of oiliness agent, 2 to 8 parts of rust inhibitor, 20 to 30 parts of distilled water, 2 to 8 parts of base value retainer, 1 to 5 parts of anti-hard water agent, 0.5 to 2 parts of corrosion inhibitor, 2 to 5 parts of bactericide, 0.1 to 1 parts of coupling agent and 0.05 to 0.2 parts of defoamer;

[0007] Wherein, the anti-hard water agent includes alcohol ether carboxylic acid.

[0008] Since the anti-hard water agent is greatly affected by the cutting fluid formula during use, the universality of the anti-hard water agent is poor. However, the present invention unexpectedly found that by controlling the content of each component of the cutting fluid within the above range and using an anti-hard water agent including alcohol ether carboxylic acid, the obtained cutting fluid has good aluminum corrosion inhibition performance and emulsion stability. In particular, the aviation aluminum alloy cutting fluid provided by the present invention not only has excellent aluminum corrosion resistance and emulsion stability in a hard water environment, but also has excellent aluminum corrosion inhibition performance and emulsion stability in a more demanding aluminum sulfate solution environment.

[0009] As a specific embodiment of the present invention, preferably, the base oil is selected from cycloalkyl oil, and more preferably, the kinematic viscosity of the cycloalkyl oil at 40° C. is 20 to 25 mm 2 ·s -1 .

[0010] As a specific embodiment of the present invention, preferably, the emulsifier is selected from at least one of alkylphenol polyoxyethylene ether, fatty alcohol polyoxyethylene ether, sorbitan monooleate, and sodium petroleum sulfonate.

[0011] As a specific embodiment of the present invention, preferably, the oiliness agent is at least one of tall oil and oleic acid. Preferably, the acid value of the oiliness agent is 100-300 mgKOH / g, more preferably 180-200 mgKOH / g.

[0012] As a specific embodiment of the present invention, preferably, the rust inhibitor is selected from at least two of boric acid, dodecanedioic acid, sebacic acid, and boric acid esters.

[0013] As a specific embodiment of the present invention, preferably, the defoaming agent is organosiloxane.

[0014] As a specific embodiment of the present invention, preferably, the base value retaining agent is selected from at least one of triethanolamine, monoethanolamine and dicyclohexylamine.

[0015] As a specific embodiment of the present invention, preferably, the amount of the alcohol ether carboxylic acid added is 1.5-4 parts by weight, and / or the anti-hard water agent further includes an ethylenediaminetetraacetic acid complexing agent and / or sodium tripolyphosphate.

[0016] As a specific embodiment of the present invention, preferably, the corrosion inhibitor is selected from at least one of phosphate ester, phosphonate ester and benzotriazole.

[0017] As a specific embodiment of the present invention, preferably, the fungicide is selected from at least one of N,N'-methylenedimorpholine, benzisothiazolinone and n-butylbenzisothiazolinone.

[0018] As a specific embodiment of the present invention, preferably, the coupling agent is C 14 -C 15 Alcohol (commercially available product).

[0019] To this end, in a second aspect, the present invention provides a method for preparing the above-mentioned aviation aluminum alloy cutting fluid, comprising the following steps:

[0020] S1: Mix water, alcohol amine, rust inhibitor and anti-hard water agent to obtain mixture A;

[0021] S2: Mixing the mixture A obtained in step S1 with a base oil, an oiliness agent, an emulsifier, a corrosion inhibitor, and a defoaming agent to obtain a mixture B;

[0022] S3: Mix the mixture B obtained in step S2 with a bactericide and a coupling agent to obtain the aviation aluminum alloy cutting fluid.

[0023] As a specific embodiment of the present invention, preferably, in step S1, the mixing conditions include: the mixing method is stirring, the stirring rate is 300-500rmp, the stirring time is 60-90min, and / or the mixing temperature is 40-45°C;

[0024] And / or, in step S2, the mixing conditions include: the mixing method is stirring, the stirring rate is 300-500 rpm, the stirring time is 60-120 min, and / or the mixing temperature is 40-45° C.;

[0025] And / or, in step S3, the mixing conditions include: the mixing method is stirring, the stirring rate is 300-500 rpm, the stirring time is 30-60 min, and / or the mixing temperature is 30-40°C.

[0026] As a specific embodiment of the present invention, preferably, the preparation method of the aviation aluminum alloy cutting fluid comprises the following steps:

[0027] Add water, alcohol amine, rust inhibitor and anti-hard water agent into the reaction kettle, stir thoroughly for 1 hour at 40-45°C until the solution is stable, uniform and transparent as a whole, then add base oil, oiliness agent, emulsifier, corrosion inhibitor and defoaming agent in sequence, stir thoroughly for 1-2 hours at 40-45°C, then confirm that the temperature is below 40°C, add bactericide, stir for 30 minutes until it is completely dissolved, and finally add coupling agent to obtain the cutting fluid composition.

[0028] The advantages of the present invention are:

[0029] The aviation aluminum alloy cutting fluid provided by the present invention can meet the processing requirements of cutting, milling, cutting, etc., and has good aluminum corrosion inhibition performance and emulsion stability. At the same time, the cutting fluid has good biological stability and a long service life. In particular, the aviation aluminum alloy cutting fluid provided by the present invention not only has excellent aluminum corrosion resistance and emulsion stability in a hard water environment, but also has excellent aluminum corrosion inhibition and emulsion stability in a more demanding aluminum sulfate solution environment. DETAILED DESCRIPTION

[0030] The embodiments of the present invention will be described in detail below in conjunction with the examples, but those skilled in the art will appreciate that the following examples are only used to illustrate the present invention and should not be considered to limit the scope of the present invention. If no specific conditions are specified in the examples, they are carried out according to normal conditions or the conditions recommended by the manufacturer. If the manufacturer is not specified for the reagents or instruments used, they are all conventional products that can be obtained commercially.

[0031] 1. Raw materials

[0032] The kinematic viscosity of naphthenic oil at 40°C is 22.1 mm 2 ·s -1 ;

[0033] The structural formula of alkylphenol polyoxyethylene ether is CH3(CH2)7C6H4(OC2H4) 10 OH;

[0034] The molecular formula of fatty alcohol polyoxyethylene ether is C 30 H 62 O 10 ;

[0035] The molecular formula of sorbitan monooleate is C 24 H 44 O6;

[0036] The structural formula of alcohol ether carboxylic acid is CH3(CH2) 12 O(CH2CH2O) 10 CH2COOH;

[0037] Tall oil, acid value is 189.8mgKOH / g;

[0038] Oleic acid, acid value is 198.7mgKOH / g;

[0039] Phosphate ester, acid value is 151mgKOH / g.

[0040] (II) Test methods

[0041] Aluminum sheet corrosion test:

[0042] The corrosion test of aluminum sheets is carried out in accordance with GB / T 6144. Among them, Grade A - no rust, shiny as new; Grade B - slightly darkened; Grade C - moderately darkened; Grade D - severely darkened.

[0043] Aluminum alloy cutting fluid emulsion stability test:

[0044] The emulsion stability test was conducted in accordance with SH / T 0579, where 40-grade hard water was prepared according to MT / T 76-2011 and the dilution concentration was 5wt%. The pure oil layer is the amount of pure oil layer precipitated from the dilution, the pure soap layer is the amount of pure soap layer precipitated from the dilution, and the emulsification state "E" represents the emulsion.

[0045] Example 1

[0046] (I) Prepare the following components by weight:

[0047] Base oil: 42 parts of naphthenic oil,

[0048] Emulsifier: 3 parts of sorbitan monooleate, 3.5 parts of alkylphenol polyoxyethylene ether,

[0049] Oiliness agent: 6 parts of tall oil,

[0050] Rust inhibitor: 3 parts of boric acid ester, 3 parts of sebacic acid,

[0051] Base value retaining agent: 2.5 parts of monoethanolamine, 1 part of dicyclohexylamine,

[0052] Corrosion inhibitor: 0.5 parts of benzotriazole,

[0053] Anti-hard water agent: 3 parts of alcohol ether carboxylic acid,

[0054] Defoaming agent: 0.05 parts of organic siloxane,

[0055] Bactericide: 3 parts of N,N'-methylenedimorpholine,

[0056] Couplant: C 14 -C 15 0.5 parts of alcohol,

[0057] Deionized water: balance, make up to 100 parts.

[0058] (ii) According to the weight proportions of the components in step (1), an aviation aluminum alloy cutting fluid is prepared, the steps being as follows:

[0059] (1) First, water, alcohol amine, rust inhibitor, and anti-hard water agent are added to a reaction kettle and stirred at 45° C. for 1 hour until the solution is stable, uniform, and transparent;

[0060] (2) Add base oil, oiliness agent, emulsifier, corrosion inhibitor, and defoamer in sequence, and stir thoroughly at 45°C for 1-2 hours;

[0061] (3) After confirming that the temperature is below 40°C, add the fungicide and stir for 30 minutes until it is completely dissolved;

[0062] (4) Finally, a coupling agent is added to obtain a stable and uniform liquid, which is the aluminum alloy cutting fluid.

[0063] The results of the aluminum sheet corrosion test and emulsion stability test of the obtained aluminum alloy cutting fluid are as follows:

[0064] Table 1

[0065]

[0066] Table 2

[0067]

[0068] It can be seen from Table 1 and Table 2 that the cutting fluid synthesized in Example 1 has good aluminum corrosion inhibition performance and emulsification stability in 40 grade hard water and in aluminum sulfate solution which has more stringent requirements on the hard water resistance of the cutting fluid.

[0069] Example 2

[0070] (I) Prepare the following components by weight:

[0071] Base oil: 42 parts of naphthenic oil,

[0072] Emulsifier: 4.2 parts of sorbitan monooleate, 5 parts of fatty alcohol polyoxyethylene ether,

[0073] Oiliness agent: 6 parts of oleic acid,

[0074] Rust inhibitor: 3 parts of borate, 4 parts of dodecanedioic acid,

[0075] Base value maintaining agent: 2.5 parts of triethanolamine,

[0076] Corrosion inhibitor: 0.5 parts of phosphate ester,

[0077] Anti-hard water agent: 2 parts of alcohol ether carboxylic acid, 0.5 parts of sodium tripolyphosphate,

[0078] Defoaming agent: 0.08 parts of organic siloxane,

[0079] Bactericide: 3 parts of benzisothiazolinone,

[0080] Couplant: C 14 -C 15 Alcohol 0.8 parts,

[0081] Deionized water: balance, make up to 100 parts.

[0082] (ii) Aviation aluminum alloy cutting fluid was prepared in the same manner as in Example 1. The results of the aluminum sheet corrosion test and emulsion stability test of the obtained aluminum alloy cutting fluid are as follows:

[0083] Table 3

[0084]

[0085] Table 4

[0086]

[0087]

[0088] It can be seen from Table 3 and Table 4 that the cutting fluid synthesized in Example 2 has good aluminum corrosion inhibition performance and emulsification stability both in 40-grade hard water and in aluminum sulfate solution that has more stringent requirements on the hard water resistance of the cutting fluid.

[0089] Example 3

[0090] (1) Prepare the following components in parts by weight:

[0091] Base oil: 44 parts of naphthenic oil,

[0092] Emulsifier: 4 parts of alkylphenol polyoxyethylene ether, 5 parts of fatty alcohol polyoxyethylene ether,

[0093] Oiliness agent: 6 parts of tall oil,

[0094] Rust inhibitor: 5 parts of boric acid, 4 parts of sebacic acid,

[0095] Base value retaining agent: 2.5 parts of monoethanolamine,

[0096] Corrosion inhibitor: 1.2 parts of phosphonate,

[0097] Anti-hard water agent: 2.5 parts of alcohol ether carboxylic acid, 0.5 parts of tetrasodium ethylenediaminetetraacetic acid,

[0098] Defoaming agent: 0.08 parts of organic siloxane,

[0099] Bactericide: 3 parts of n-butylbenzisothiazolinone,

[0100] Couplant: C 14 -C15 0.5 parts of alcohol,

[0101] Deionized water: balance, make up to 100 parts.

[0102] (ii) Aviation aluminum alloy cutting fluid was prepared in the same manner as in Example 1. The results of the aluminum sheet corrosion test and emulsion stability test of the obtained aluminum alloy cutting fluid are as follows:

[0103] Table 5

[0104]

[0105] Table 6

[0106]

[0107] It can be seen from Tables 5 and 6 that the cutting fluid synthesized in Example 3 has good aluminum corrosion inhibition performance and emulsification stability both in 40-grade hard water and in an aluminum sulfate solution that has more stringent requirements on the hard water resistance of the cutting fluid.

[0108] Example 4

[0109] (1) Prepare the following components in parts by weight:

[0110] Base oil: 46 parts of naphthenic oil,

[0111] Emulsifier: 5 parts of alkylphenol polyoxyethylene ether, 3 parts of sodium petroleum sulfonate,

[0112] Oiliness agent: oleic acid 5 parts,

[0113] Rust inhibitor: 3.5 parts of boric acid, 4 parts of dodecanedioic acid,

[0114] Base value maintaining agent: 2.5 parts of triethanolamine,

[0115] Corrosion inhibitor: 0.5 parts of benzotriazole,

[0116] Anti-hard water agent: 2 parts of alcohol ether carboxylic acid, 1 part of tetrasodium ethylenediaminetetraacetic acid,

[0117] Defoaming agent: 0.08 parts of organic siloxane,

[0118] Bactericide: 3 parts of N,N'-methylenedimorpholine,

[0119] Couplant: C 14 -C 15 Alcohol 0.8 parts,

[0120] Deionized water: balance, make up to 100 parts.

[0121] (ii) Aviation aluminum alloy cutting fluid was prepared in the same manner as in Example 1. The results of the aluminum sheet corrosion test and emulsion stability test of the obtained aluminum alloy cutting fluid are as follows:

[0122] Table 7

[0123]

[0124] Table 8

[0125]

[0126] It can be seen from Tables 7 and 8 that the cutting fluid synthesized in Example 4 has good aluminum corrosion inhibition performance and emulsification stability both in 40-grade hard water and in an aluminum sulfate solution that has more stringent requirements on the hard water resistance of the cutting fluid.

[0127] Example 5

[0128] (I) Prepare the following components by weight:

[0129] Base oil: 48 parts of naphthenic oil,

[0130] Emulsifier: 4 parts of sorbitan monooleate, 5 parts of sodium petroleum sulfonate,

[0131] Oiliness agent: 5 parts of tall oil,

[0132] Rust inhibitor: 3.5 parts of boric acid ester, 4 parts of sebacic acid,

[0133] Base value maintaining agent: 2.5 parts of triethanolamine,

[0134] Corrosion inhibitor: 0.5 parts of benzotriazole,

[0135] Anti-hard water agent: 1.5 parts of alcohol ether carboxylic acid, 0.8 parts of sodium tripolyphosphate,

[0136] Defoaming agent: 0.08 parts of organic siloxane,

[0137] Bactericide: 3 parts of benzisothiazolinone,

[0138] Couplant: C 14 -C 15 Alcohol 0.8 parts,

[0139] Deionized water: balance, make up to 100 parts.

[0140] (ii) Aviation aluminum alloy cutting fluid was prepared in the same manner as in Example 1. The results of the aluminum sheet corrosion test and emulsion stability test of the obtained aluminum alloy cutting fluid are as follows:

[0141] Table 9

[0142]

[0143] Table 10

[0144]

[0145] It can be seen from Tables 9 and 10 that the cutting fluid synthesized in Example 5 has good aluminum corrosion inhibition performance and emulsification stability both in 40-grade hard water and in aluminum sulfate solution that has more stringent requirements on the hard water resistance of the cutting fluid.

[0146] Comparative Example 1

[0147] (I) Prepare the following components by weight:

[0148] Base oil: 42 parts of naphthenic oil,

[0149] Emulsifier: 3 parts of sorbitan monooleate, 3.5 parts of alkylphenol polyoxyethylene ether,

[0150] Oiliness agent: 6 parts of tall oil,

[0151] Rust inhibitor: 3 parts of boric acid ester, 3 parts of sebacic acid,

[0152] Base value retaining agent: 2.5 parts of monoethanolamine, 1 part of dicyclohexylamine,

[0153] Corrosion inhibitor: 0.2 parts of benzotriazole,

[0154] Anti-hard water agent: 3 parts of alcohol ether carboxylic acid,

[0155] Defoaming agent: 0.05 parts of organic siloxane,

[0156] Bactericide: 3 parts of N,N'-methylenedimorpholine,

[0157] Couplant: C 14 -C 15 0.5 parts of alcohol,

[0158] Deionized water: balance, make up to 100 parts.

[0159] (ii) Aviation aluminum alloy cutting fluid was prepared in the same manner as in Example 1. The results of the aluminum sheet corrosion test and emulsion stability test of the obtained aluminum alloy cutting fluid are as follows:

[0160] Table 11

[0161]

[0162] Table 12

[0163]

[0164] It can be seen from Tables 11 and 12 that the amount of corrosion inhibitor used is too small, and the aluminum corrosion inhibition performance of the cutting fluid synthesized in Comparative Example 1 is poor.

[0165] Comparative Example 2

[0166] (I) Prepare the following components by weight:

[0167] Base oil: 42 parts of naphthenic oil,

[0168] Emulsifier: 3 parts of sorbitan monooleate, 3.5 parts of alkylphenol polyoxyethylene ether,

[0169] Oiliness agent: 6 parts of tall oil,

[0170] Rust inhibitor: 3 parts of boric acid ester, 3 parts of sebacic acid,

[0171] Base value retaining agent: 2.5 parts of monoethanolamine, 1 part of dicyclohexylamine,

[0172] Corrosion inhibitor: 0.5 parts of benzotriazole,

[0173] Defoaming agent: 0.05 parts of organic siloxane,

[0174] Bactericide: 3 parts of N,N'-methylenedimorpholine,

[0175] Couplant: C 14 -C 15 0.5 parts of alcohol,

[0176] Deionized water: balance, make up to 100 parts.

[0177] (ii) Aviation aluminum alloy cutting fluid was prepared in the same manner as in Example 1. The results of the aluminum sheet corrosion test and emulsion stability test of the obtained aluminum alloy cutting fluid are as follows:

[0178] Table 13

[0179]

[0180] Table 14

[0181]

[0182]

[0183] It can be seen from Tables 13 and 14 that the cutting fluid synthesized without adding anti-hard water agent has poor emulsification stability in 40 grade hard water and aluminum sulfate solution.

[0184] Comparative Example 3

[0185] (I) Prepare the following components by weight:

[0186] Base oil: 42 parts of naphthenic oil,

[0187] Emulsifier: 3 parts of sorbitan monooleate, 3.5 parts of alkylphenol polyoxyethylene ether,

[0188] Oiliness agent: 6 parts of tall oil,

[0189] Rust inhibitor: 3 parts of boric acid ester, 3 parts of sebacic acid,

[0190] Base value retaining agent: 2.5 parts of monoethanolamine, 1 part of dicyclohexylamine,

[0191] Corrosion inhibitor: 0.5 parts of benzotriazole,

[0192] Anti-hard water agent: 1.5 parts of sodium tripolyphosphate, 1.5 parts of tetrasodium ethylenediaminetetraacetic acid,

[0193] Defoaming agent: 0.05 parts of organic siloxane,

[0194] Bactericide: 3 parts of N,N'-methylenedimorpholine,

[0195] Couplant: C 14 -C 15 0.5 parts of alcohol,

[0196] Deionized water: balance, make up to 100 parts.

[0197] (ii) Aviation aluminum alloy cutting fluid was prepared in the same manner as in Example 1. The results of the aluminum sheet corrosion test and emulsion stability test of the obtained aluminum alloy cutting fluid are as follows:

[0198] Table 15

[0199]

[0200] Table 16

[0201]

[0202]

[0203] It can be seen from Tables 15 and 16 that without adding alcohol ether carboxylic acid and selecting other conventional anti-hard water agents (such as sodium tripolyphosphate and tetrasodium ethylenediaminetetraacetic acid), the synthetic cutting fluid has poor emulsification stability in aluminum sulfate solution.

[0204] The above description of the embodiments is to facilitate the understanding and application of the present invention by those skilled in the art. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the present invention is not limited to the embodiments herein, and improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the protection scope of the present invention.

Claims

1. An aviation aluminum alloy cutting fluid, characterized in that: The composition comprises the following components by weight: 40-50 parts of base oil, 5-15 parts of emulsifier, 5-15 parts of oiliness agent, 2-8 parts of rust inhibitor, 20-30 parts of distilled water, 2-8 parts of alkalinity retainer, 1-5 parts of anti-hard water agent, 0.5-2 parts of corrosion inhibitor, 2-5 parts of fungicide, 0.1-1 parts of coupling agent and 0.05-0.2 parts of defoamer; Wherein, the anti-hard water agent includes alcohol ether carboxylic acid.

2. The cutting fluid according to claim 1, characterized in that: The base oil is a cycloalkyl oil. Preferably, the kinematic viscosity of the cycloalkyl oil at 40° C. is 20 to 25 mm 2 ·s -1 .

3. The cutting fluid according to claim 1 or 2, characterized in that: The emulsifier is selected from at least one of alkylphenol polyoxyethylene ether, fatty alcohol polyoxyethylene ether, sorbitan monooleate, and sodium petroleum sulfonate.

4. The cutting fluid according to any one of claims 1 to 3, characterized in that: The oiliness agent is at least one of tall oil and oleic acid. Preferably, the acid value of the oiliness agent is 100-300 mgKOH / g, more preferably 180-200 mgKOH / g.

5. The cutting fluid according to any one of claims 1 to 4, characterized in that: The rust inhibitor is selected from at least two of boric acid, dodecanedioic acid, sebacic acid, and boric acid esters; and / or the defoamer is an organosiloxane; and / or the base value retainer is selected from at least one of triethanolamine, monoethanolamine, and dicyclohexylamine; and / or the corrosion inhibitor is selected from at least one of phosphate esters, phosphonates, and benzotriazole.

6. The cutting fluid according to any one of claims 1 to 5, characterized in that: The alcohol ether carboxylic acid is added in an amount of 1.5-4 parts by weight, and / or the anti-hard water agent further comprises an ethylenediaminetetraacetic acid complexing agent and / or sodium tripolyphosphate.

7. The cutting fluid according to any one of claims 1 to 6, characterized in that: The bactericide is selected from at least one of N,N'-methylenedimorpholine, benzisothiazolinone and n-butylbenzisothiazolinone.

8. The cutting fluid according to any one of claims 1 to 7, characterized in that: The coupling agent is C 14 -C 15 alcohol.

9. A method for preparing the aviation aluminum alloy cutting fluid according to any one of claims 1 to 8, characterized in that: The steps include: S1: Mix water, alcohol amine, rust inhibitor and anti-hard water agent to obtain mixture A; S2: Mixing the mixture A obtained in step S1 with a base oil, an oiliness agent, an emulsifier, a corrosion inhibitor, and a defoaming agent to obtain a mixture B; S3: Mix the mixture B obtained in step S2 with a bactericide and a coupling agent to obtain the aviation aluminum alloy cutting fluid.

10. The preparation method according to claim 9, characterized in that: In step S1, the mixing conditions include: the mixing method is stirring, the stirring rate is 300-500 rpm, the stirring time is 60-90 min, and / or the mixing temperature is 40-45° C.; And / or, in step S2, the mixing conditions include: the mixing method is stirring, the stirring rate is 300-500 rpm, the stirring time is 60-120 min, and / or the mixing temperature is 40-45° C.; And / or, in step S3, the mixing conditions include: the mixing method is stirring, the stirring rate is 300-500 rpm, the stirring time is 30-60 min, and / or the mixing temperature is 30-40°C.

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