Finish machining medium for aerospace and preparation method thereof

Abstract

The invention relates to the technical field of metal working fluids, in particular to a finish machining medium for aerospace and a preparation method thereof, and the finish machining medium for aerospace comprises the following raw materials in parts by weight: 25-40 parts of natural fatty acid ester base oil, 5-12 parts of an oiliness agent, 8-15 parts of a compound surfactant, 1.2-5 parts of a corrosion inhibitor and soft water. The purpose of the invention is to not only avoid corrosion and discoloration when an alloy material for aerospace is processed for a long time, but also reduce the wear of a cutter, reduce the processing cost, reduce the influence on the body health of operators, and be biodegradable and green and environment-friendly.

Description

Technical Field

[0001] The present invention relates to the technical field of metalworking fluids, and in particular to a finishing medium for aerospace applications and a preparation method thereof. Background Art

[0002] There are many materials used in aerospace, which can generally be divided into two categories: alloy materials and polymer composite materials. Alloy materials mainly include aluminum alloys, magnesium alloys, titanium alloys, high-strength steels, nickel-molybdenum-tungsten alloys, etc. Among them, aluminum alloy materials account for about 50%-70% of the aircraft materials, magnesium alloy materials account for about 5%-10% of the aircraft materials, and in modern aircraft, the proportion of titanium alloy usage is increasing. In the manufacturing and use process of aircraft parts, corrosion and anti-corrosion are important issues.

[0003] In the processing of parts, metalworking fluids are used. The processing of some non-ferrous metals such as aluminum alloy 7075, 7050-T7451, etc. takes about 20 days. During such a long processing time, there are some problems of corrosion and discoloration. In the processing of titanium alloy parts, due to the characteristics of titanium alloy such as high hardness and high chemical activity, the cutting force is large and the temperature is high during the cutting process. Since the thermal conductivity of titanium alloy is small, about 1 / 3 of that of iron, the heat generated during machining is difficult to be released through the workpiece, resulting in a rapid rise in local temperature, which is likely to cause the tool temperature to be very high, leading to rapid wear of the tool tip and reduced service life. Moreover, the processing time of titanium alloy parts is generally more than 20 days. During the long processing process, it is easy to chemically react with the components in the metalworking fluid to generate some oxides and other compounds. These reaction products are easily attached to the surface of the titanium alloy, affecting the processing quality and tool life. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a finishing medium for aerospace applications and a preparation method thereof, which can not only prevent corrosion and discoloration during the long-term processing of alloy materials used in aerospace, but also reduce tool wear, reduce processing costs, and not only reduce the impact on the physical health of operators, but also be biodegradable and environmentally friendly.

[0005] The present invention solves the above technical problems through the following technical means: A finishing medium for aerospace applications comprises the following raw materials in parts by weight: 25-40 parts of natural fatty acid ester-based base oil, 5-12 parts of oiliness agent, 8-15 parts of compound surfactant, 1.2-5 parts of corrosion inhibitor, and soft water.

[0006] According to the above technical means, by selecting natural fatty acid ester-based base oils, their unique bipolar molecular structure has a strong affinity for metals. Compared with general mineral oils, the lubricating ability is significantly improved, and the tool consumption can be saved by about 30%. It is safe to use, and the biodegradation rate can reach more than 95%. When combined with an oiliness agent, it can reduce the friction and wear between the tool and the alloy material, improve the lubrication effect, and can also form an adsorption film. The formed adsorption film, combined with a corrosion inhibitor, forms a denser protective film, which can avoid the corrosion and discoloration of the alloy material during long-term processing. By further adopting a compound surfactant, it can play roles such as emulsification, cleaning, wetting, and penetration. It also has properties such as being stable to acids, alkalis, and chlorine, having good hard water resistance, being mild to the skin and eyes, and being easily biodegradable. This makes the finishing medium not only able to play a good protective role for the alloy material, but also be biodegradable, environmentally friendly, reduce the impact on the physical health of operators, and reduce the difficulty of subsequent wastewater treatment.

[0007] Preferably, the natural fatty acid ester-based base oil is an ester intermediate derived from natural oils and fats, including but not limited to one or more combinations of stearate, glycerol stearate, oleate, pentaerythritol oleate, butyl palmitate, and cetyl palmitate.

[0008] More preferably, the ester intermediate derived from natural oils and fats is a mixture of stearate and pentaerythritol oleate.

[0009] More preferably, the stearate is sucrose stearate, and the mass ratio of sucrose stearate to pentaerythritol oleate is 2:(1 - 3).

[0010] According to the above technical means, sucrose stearate has good lubricity and stability, and can reduce friction and heat during metal processing; pentaerythritol oleate has good lubricity, emulsifying property, thermal stability, oxidation stability, and compatibility, and can improve the wettability, fluidity, and cooling property of metal working fluids, thereby reducing the influence of thermal deformation and stress on parts during the processing of alloy materials, and can be applicable to the processing of alloy materials with different performance differences such as aluminum alloys and titanium alloys.

[0011] Moreover, both sucrose stearate and pentaerythritol oleate have good biodegradability and are mild to the skin, etc., with high safety. By controlling the addition ratio of the two, better biodegradation effects, lubrication effects, etc. can be achieved.

[0012] Preferably, the oiliness agent is one or more combinations of triethanolamine oleate, diethanolamide oleate, sulfurized oleic acid, tall oil diethanolamide, ricinoleic acid, coconut fatty acid, whale oil fatty acid, palm oil fatty acid, and neodecanoic acid.

[0013] Further preferably, the oiliness agent is tall oil diethanolamide.

[0014] According to the above technical means, since tall oil diethanolamide is soluble in the oil phase and easily dispersed in the water phase system, it can make the base oil and water miscible well. Moreover, tall oil diethanolamide has lubricity, emulsifying property, resistance to hard water, corrosion resistance and rust prevention performance, and can form an adsorption film on the alloy material to be processed, improving the lubrication effect and preventing the synthetic material from being prone to corrosion and discoloration during long-term processing.

[0015] Preferably, the compound surfactant is at least two of α-sulfo fatty acid methyl ester, alkyl polyglycoside, glucose amide, alcohol ether carboxylate, monoalkyl phosphate, alkyl glucose amide, SP-20, SP-40, SP-80, T-20, T-40, T-80.

[0016] Further preferably, the compound surfactant is a mixture of glucose amide and sodium fatty acid methyl ester sulfonate.

[0017] Further preferably, the glucose amide is glucose laurate.

[0018] Further preferably, the mass ratio of glucose laurate to sodium fatty acid methyl ester sulfonate is 3:(1 - 2).

[0019] According to the above technical means, since glucose laurate is a non-ionic starch-based amphoteric surfactant, in metalworking fluids, it can not only improve the lubrication performance and cooling performance, but also play roles such as emulsifying, cleaning, wetting, and penetrating; fatty acid methyl ester sulfonic acid, as an anionic surfactant, can play excellent roles such as wetting, emulsifying, cooling, dispersing, cleaning, resistance to hard water, and stability to acids, alkalis, and chlorine in metalworking fluids, and can also play a synergistic improvement effect during the compounding process with other components such as rust inhibitors, corrosion inhibitors, and extreme pressure agents. Moreover, both glucose laurate and sodium fatty acid methyl ester sulfonate have good biodegradability, are mild to skin and eyes, are green and environmentally friendly, reducing the impact on the physical health of operators and the difficulty of subsequent wastewater treatment.

[0020] Preferably, the corrosion inhibitor is one or a combination of alkynol corrosion inhibitors, organic corrosion inhibitors, amine corrosion inhibitors, sulfonate corrosion inhibitors, pyridine corrosion inhibitors.

[0021] Further preferably, the corrosion inhibitor is a mixture of sulfonate corrosion inhibitor and organic corrosion inhibitor.

[0022] Further preferably, the sulfonate corrosion inhibitor is sodium dodecyl sulfonate.

[0023] Further preferably, the organic corrosion inhibitor is dodecyl trimethyl ammonium chloride.

[0024] More preferably, the mass ratio of sodium hexadecyl sulfonate to dodecyl trimethyl ammonium chloride is 2:1.

[0025] According to the above technical means, both sodium hexadecyl sulfonate and dodecyl trimethyl ammonium chloride can form an adsorption film on the processed surface of the alloy material. In combination with the oiliness agent, a denser protective film is formed, which has a good corrosion inhibition effect on non-ferrous metals, titanium alloys, steel, etc., and can also play good emulsifying, softening and lubricating roles. Moreover, both sodium dodecyl sulfonate and dodecyl trimethyl ammonium chloride are biodegradable and environmentally friendly.

[0026] Preferably, it further includes a rust inhibitor, and the rust inhibitor is one or a combination of more of organic carboxylic acid alkanolamine salts rust inhibitors, polyol esters rust inhibitors, and organic carboxylic acid derivatives.

[0027] More preferably, the rust inhibitor is an organic carboxylic acid alkanolamine salt rust inhibitor.

[0028] More preferably, the organic carboxylic acid alkanolamine salt rust inhibitor is sorbitan monooleate.

[0029] According to the above technical means, by selecting sorbitan monooleate as the rust inhibitor, it not only has good rust prevention performance, but also can form a dense protective film on the working surface of the alloy material to be processed. In combination with the dense protective film formed by the oiliness agent and the corrosion inhibitor, the protection time of the protective film is longer, it can better adapt to the long processing process, effectively avoid the problem of corrosion and discoloration, and it can also be biodegradable, reducing the difficulty of subsequent treatment.

[0030] Preferably, it further includes a silicon-free defoamer and an environmentally friendly bacteriostatic agent.

[0031] More preferably, the silicon-free defoamer is one or a combination of more of glycerol polyoxyethylene ether, polyvinyl alcohol, higher alcohols, and polyether modified derivatives.

[0032] More preferably, the silicon-free defoamer is glycerol polyoxyethylene ether.

[0033] According to the above technical means, glycerol polyoxyethylene ether not only has good foam suppression and defoaming performance, but also can be biodegradable and is friendly to the environment.

[0034] More preferably, the environmentally friendly bacteriostatic agent is one or a combination of more of allicin, tea tree oil, matrine, 1,2-benzisothiazolin-3-one, N,N-dimethyl-N-tetradecyl benzyl ammonium chloride, and octadecyl dimethyl benzyl ammonium chloride.

[0035] More preferably, the environmentally friendly bacteriostatic agent is octadecyl dimethyl benzyl ammonium chloride.

[0036] According to the above technical means, octadecyl dimethyl benzyl ammonium chloride has excellent antistatic, bactericidal, antibacterial, anticorrosive, corrosion inhibition, solubilization, emulsification, dispersion, wetting and other properties, and also has biodegradability, being green and environmentally friendly.

[0037] This application also discloses a preparation method of a finishing medium for aerospace, comprising the following steps: S1. Add natural fatty acid ester-based base oil, oiliness agent, corrosion inhibitor and rust inhibitor into soft water, and stir for 30 - 60 min to obtain a preliminary mixture; S2. Add compound surfactant, silicon-free defoamer and environmentally friendly bacteriostatic agent into the preliminary mixture, and under the condition of 30 - 40 °C, perform ultrasonic treatment for 20 - 40 min, and then let it stand for 10 - 20 min; S3. Cool the solution treated in step S2 to room temperature to obtain a finishing medium for aerospace.

[0038] This application adopting the above scheme has the following beneficial effects: 1. By selecting the combination of natural fatty acid ester-based base oil, oiliness agent, compound surfactant and corrosion inhibitor, it can not only reduce the friction and wear between the tool and the alloy material, saving about 30% of the tool, but also form a denser protective film, avoiding the corrosion and discoloration of the alloy material during long-term processing, and being biodegradable, green and environmentally friendly, reducing the impact on the physical health of operators and the difficulty of subsequent wastewater treatment; 2. By adding rust inhibitor, the anticorrosion and discoloration performance of the whole formulation is stronger, which is more conducive to the long-term processing of workpieces such as aluminum alloy, titanium alloy and steel; 3. The formulation of this application has strong lubrication performance and cooling performance, which can reduce the wear of the tool and the influence of heat during processing on the alloy material and the tool; 4. All components of the formulation of this application are biodegradable, green and environmentally friendly, mild to the skin of operators, low in volatility, harmless to the respiratory system, and environmentally friendly. Specific Embodiments

[0039] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in combination with the specific embodiments in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention: A finishing medium for aerospace in an embodiment of this application adopts the following raw materials: [[ID= Oiliness agent: tall oil diethanolamide; Compound surfactant: lauric acid glucamide and sodium fatty acid methyl ester sulfonate, with a mass ratio of 3:(1 - 2); Corrosion inhibitor: sodium hexadecyl sulfonate and dodecyl trimethyl ammonium chloride, with a mass ratio of 2:1; Rust inhibitor: sorbitan monooleate; Silicone-free defoamer: glycerol polyoxyethylene ether; Environmentally friendly bacteriostatic agent: octadecyl dimethyl benzyl ammonium chloride; the balance is soft water.

[0040] Example 1, Preparation of finishing medium for aerospace - I S1. Add 20 parts by mass of sucrose stearate, 10 parts by mass of pentaerythritol oleate, 5 parts by mass of tall oil diethanolamide, 0.8 part by mass of sodium hexadecyl sulfonate, 0.4 part by mass of dodecyl trimethyl ammonium chloride, and 2.8 parts by mass of sorbitan monooleate to 100 parts by mass of soft water, and stir for 30 min to obtain a preliminary mixture; S2. Add 6 parts by mass of lauric acid glucamide, 2 parts by mass of sodium fatty acid methyl ester sulfonate, 1.8 parts by mass of glycerol polyoxyethylene ether, and 1.2 parts by mass of octadecyl dimethyl benzyl ammonium chloride to the preliminary mixture, and under the condition of 35 ± 2 °C and at a power of 2000 W, perform ultrasonic treatment for 25 min, and then stand still for 10 min under the condition of 35 ± 2 °C; S3. Cool the solution treated in step S2 to room temperature to obtain the finishing medium for aerospace.

[0041] Example 2, Preparation of finishing medium for aerospace - II S1. Add 20 parts by mass of sucrose stearate, 10 parts by mass of pentaerythritol oleate, 8 parts by mass of tall oil diethanolamide, 1 part by mass of sodium hexadecyl sulfonate, 0.5 part by mass of dodecyl trimethyl ammonium chloride, and 2.5 parts by mass of sorbitan monooleate to 100 parts by mass of soft water, and stir for 30 min to obtain a preliminary mixture; S2. Add 7.2 parts by mass of lauric acid glucamide, 4.8 parts by mass of sodium fatty acid methyl ester sulfonate, 2.5 parts by mass of glycerol polyoxyethylene ether, and 1.5 parts by mass of octadecyl dimethyl benzyl ammonium chloride to the preliminary mixture, and under the condition of 35 ± 2 °C and at a power of 2000 W, perform ultrasonic treatment for 25 min, and then stand still for 10 min under the condition of 35 ± 2 °C; S3. Cool the solution treated in step S2 to room temperature to obtain the finishing medium for aerospace.

[0042] Example 3, Preparation of finishing medium for aerospace - III S1. Add 20 parts by mass of sucrose stearate, 20 parts by mass of pentaerythritol oleate, 8 parts by mass of tall oil diethanolamide, 1 part by mass of sodium cetylsulfonate, 0.5 part by mass of dodecyltrimethylammonium chloride, and 2.5 parts by mass of sorbitan monooleate to 100 parts by mass of soft water, and stir for 30 min to obtain a preliminary mixture; S2. Add 7.5 parts by mass of lauroyl glucose amide, 2.5 parts by mass of fatty acid methyl ester sulfonate, 2.5 parts by mass of glycerol polyoxyethylene ether, and 1.5 parts by mass of octadecyl dimethyl benzyl ammonium chloride to the preliminary mixture, and under the condition of 35 ± 2 °C, at a power of 2000 W, perform ultrasonic treatment for 25 min, and then let it stand for 10 min under the condition of 35 ± 2 °C; S3. Cool the solution treated in step S2 to room temperature to obtain a finishing medium for aerospace use.

[0043] Example 4, Preparation of Finishing Medium for Aerospace Use IV S1. Add 20 parts by mass of sucrose stearate, 20 parts by mass of pentaerythritol oleate, 8.4 parts by mass of tall oil diethanolamide, 1.2 parts by mass of sodium cetylsulfonate, 0.6 part by mass of dodecyltrimethylammonium chloride, and 3.2 parts by mass of sorbitan monooleate to 100 parts by mass of soft water, and stir for 30 min to obtain a preliminary mixture; S2. Add 9 parts by mass of lauroyl glucose amide, 6 parts by mass of fatty acid methyl ester sulfonate, 3.6 parts by mass of glycerol polyoxyethylene ether, and 1.8 parts by mass of octadecyl dimethyl benzyl ammonium chloride to the preliminary mixture, and under the condition of 35 ± 2 °C, at a power of 2000 W, perform ultrasonic treatment for 25 min, and then let it stand for 10 min under the condition of 35 ± 2 °C; S3. Cool the solution treated in step S2 to room temperature to obtain a finishing medium for aerospace use.

[0044] Example 5, Preparation of Finishing Medium for Aerospace Use V S1. Add 20 parts by mass of sucrose stearate, 30 parts by mass of pentaerythritol oleate, 9.5 parts by mass of tall oil diethanolamide, 1.4 parts by mass of sodium cetylsulfonate, 0.7 part by mass of dodecyltrimethylammonium chloride, and 3.5 parts by mass of sorbitan monooleate to 100 parts by mass of soft water, and stir for 30 min to obtain a preliminary mixture; S2. Add 10.5 parts by mass of lauroyl glucose amide, 3.5 parts by mass of fatty acid methyl ester sulfonate, 3.8 parts by mass of glycerol polyoxyethylene ether, and 1.6 parts by mass of octadecyl dimethyl benzyl ammonium chloride to the preliminary mixture, and under the condition of 35 ± 2 °C, at a power of 2000 W, perform ultrasonic treatment for 25 min, and then let it stand for 10 min under the condition of 35 ± 2 °C; S3. Cool the solution processed in step S2 to room temperature to obtain a finishing medium for aerospace applications.

[0045] Example 6, Preparation of a Finishing Medium for Aerospace Applications VI S1. Add 20 parts by mass of sucrose stearate, 30 parts by mass of pentaerythritol oleate, 9.5 parts by mass of tall oil diethanolamide, 1.4 parts by mass of sodium cetylsulfonate, 0.7 parts by mass of dodecyltrimethylammonium chloride, and 3.5 parts by mass of sorbitan monooleate to 100 parts by mass of soft water, and stir for 30 min to obtain a preliminary mixture. S2. Add 7.8 parts by mass of lauroyl glucamide, 5.2 parts by mass of fatty acid methyl ester sulfonate, 2.7 parts by mass of glycerol polyoxyethylene ether, and 1.3 parts by mass of octadecyl dimethyl benzyl ammonium chloride to the preliminary mixture, and perform ultrasonic treatment at 35 ± 2 °C and a power of 2000 W for 25 min, and then let it stand for 10 min at 35 ± 2 °C. S3. Cool the solution processed in step S2 to room temperature to obtain a finishing medium for aerospace applications.

[0046] Example 7 (Comparative Example 1), Preparation of a Finishing Medium for Aerospace Applications VII In this example, the base oil only uses sucrose stearate.

[0047] S1. Add 20 parts by mass of sucrose stearate, 5 parts by mass of tall oil diethanolamide, 0.5 parts by mass of sodium cetylsulfonate, 0.25 parts by mass of dodecyltrimethylammonium chloride, and 2.8 parts by mass of sorbitan monooleate to 100 parts by mass of soft water, and stir for 30 min to obtain a preliminary mixture. S2. Add 6 parts by mass of lauroyl glucamide, 2 parts by mass of fatty acid methyl ester sulfonate, 1.8 parts by mass of glycerol polyoxyethylene ether, and 1.2 parts by mass of octadecyl dimethyl benzyl ammonium chloride to the preliminary mixture, and perform ultrasonic treatment at 35 ± 2 °C and a power of 2000 W for 25 min, and then let it stand for 10 min at 35 ± 2 °C. S3. Cool the solution processed in step S2 to room temperature to obtain a finishing medium for aerospace applications.

[0048] Example 8 (Comparative Example 2), Preparation of a Finishing Medium for Aerospace Applications VIII In this example, the base oil only uses pentaerythritol oleate.

[0049] S1. Add 20 parts by mass of pentaerythritol oleate, 5 parts by mass of tall oil diethanolamide, 0.5 part by mass of sodium cetylsulfonate, 0.25 part by mass of dodecyltrimethylammonium chloride, and 2.8 parts by mass of sorbitan monooleate to 100 parts by mass of soft water, and stir for 30 min to obtain a preliminary mixture; S2. Add 6 parts by mass of glucose laurate, 2 parts by mass of fatty acid methyl ester sulfonate, 1.8 parts by mass of glycerol polyoxyethylene ether, and 1.2 parts by mass of octadecyl dimethyl benzyl ammonium chloride to the preliminary mixture. Under the condition of 35 ± 2 °C and at a power of 2000 W, perform ultrasonic treatment for 25 min, and then let it stand for 10 min under the condition of 35 ± 2 °C; S3. Cool the solution treated in step S2 to room temperature to obtain a finishing medium for aerospace use.

[0050] Example 9 (Comparative Example 3), Preparation of Finishing Medium for Aerospace IX In this example, only glucose laurate is used as the surfactant.

[0051] S1. Add 20 parts by mass of sucrose stearate, 20 parts by mass of pentaerythritol oleate, 5 parts by mass of tall oil diethanolamide, 0.5 part by mass of sodium cetylsulfonate, 0.25 part by mass of dodecyltrimethylammonium chloride, and 2.8 parts by mass of sorbitan monooleate to 100 parts by mass of soft water, and stir for 30 min to obtain a preliminary mixture; S2. Add 6 parts by mass of glucose laurate, 1.8 parts by mass of glycerol polyoxyethylene ether, and 1.2 parts by mass of octadecyl dimethyl benzyl ammonium chloride to the preliminary mixture. Under the condition of 35 ± 2 °C and at a power of 2000 W, perform ultrasonic treatment for 25 min, and then let it stand for 10 min under the condition of 35 ± 2 °C; S3. Cool the solution treated in step S2 to room temperature to obtain a finishing medium for aerospace use.

[0052] Example 10 (Comparative Example 4), Preparation of Finishing Medium for Aerospace X In this example, only fatty acid methyl ester sulfonate is used as the surfactant.

[0053] S1. Add 20 parts by mass of sucrose stearate, 20 parts by mass of pentaerythritol oleate, 5 parts by mass of tall oil diethanolamide, 0.5 part by mass of sodium cetylsulfonate, 0.25 part by mass of dodecyltrimethylammonium chloride, and 2.8 parts by mass of sorbitan monooleate to 100 parts by mass of soft water, and stir for 30 min to obtain a preliminary mixture; S2. Add 6 parts by mass of sodium methyl ester sulfonate, 1.8 parts by mass of glycerol polyoxyethylene ether, and 1.2 parts by mass of octadecyl dimethyl benzyl ammonium chloride to the premixed solution. Under the condition of 35±2 °C and at a power of 2000 W, perform ultrasonic treatment for 25 min, and then let it stand for 10 min under the condition of 35±2 °C; S3. Cool the solution treated in step S2 to room temperature to obtain a finishing medium for aerospace use.

[0054] Example 11 (Comparative Example 5), Preparation of Finishing Medium for Aerospace Use XI In this example, the corrosion inhibitor is sodium cetyl sulfonate.

[0055] S1. Add 20 parts by mass of sucrose stearate, 20 parts by mass of pentaerythritol oleate, 5 parts by mass of tall oil diethanolamide, 0.5 part by mass of sodium cetyl sulfonate, and 2.8 parts by mass of sorbitan monooleate to 100 parts by mass of soft water, and stir for 30 min to obtain a premixed solution; S2. Add 6 parts by mass of lauroyl glucamide, 2 parts by mass of sodium methyl ester sulfonate, 1.8 parts by mass of glycerol polyoxyethylene ether, and 1.2 parts by mass of octadecyl dimethyl benzyl ammonium chloride to the premixed solution. Under the condition of 35±2 °C and at a power of 2000 W, perform ultrasonic treatment for 25 min, and then let it stand for 10 min under the condition of 35±2 °C; S3. Cool the solution treated in step S2 to room temperature to obtain a finishing medium for aerospace use.

[0056] Example 12 (Comparative Example 6), Preparation of Finishing Medium for Aerospace Use XII In this example, the corrosion inhibitor is dodecyl trimethyl ammonium chloride.

[0057] S1. Add 20 parts by mass of sucrose stearate, 20 parts by mass of pentaerythritol oleate, 5 parts by mass of tall oil diethanolamide, 0.25 part by mass of dodecyl trimethyl ammonium chloride, and 2.8 parts by mass of sorbitan monooleate to 100 parts by mass of soft water, and stir for 30 min to obtain a premixed solution; S2. Add 6 parts by mass of lauroyl glucamide, 2 parts by mass of sodium methyl ester sulfonate, 1.8 parts by mass of glycerol polyoxyethylene ether, and 1.2 parts by mass of octadecyl dimethyl benzyl ammonium chloride to the premixed solution. Under the condition of 35±2 °C and at a power of 2000 W, perform ultrasonic treatment for 25 min, and then let it stand for 10 min under the condition of 35±2 °C; S3. Cool the solution treated in step S2 to room temperature to obtain a finishing medium for aerospace use.

[0058] The prepared finishing media of Examples 1-6 were tested for hard water adaptability, maximum seizure load, biodegradability, PB value, PD value, and friction coefficient. Among them, the PB value represents the oil film strength, and the PD value represents the seizure load. The test results are shown in Table 1 below: Project Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Test Method Hard Water Adaptability / mg / L 986 980 992 990 988 984 JB4322 PB Value / N 834 834 883 883 834 834 Four-Ball Tester PD Value / N 1570 1570 1570 1570 1962 1962 Four-Ball Tester Friction Coefficient 0.056 0.063 0.055 0.058 0.052 0.053 Four-Ball Tester Biodegradability % 96.5 96.4 96.7 96.1 95.8 95.9 GB / T22047 According to the above data, it can be seen that the finishing media prepared in Examples 1-6 of this application have good hard water resistance, good oil film strength, larger seizure load, and smaller friction coefficient, indicating that the finishing media prepared in the examples of this application can maintain good lubricity when processing aluminum alloy materials, titanium alloys, and steel, reducing the wear of the tool; and also have excellent biodegradability, which can reduce the impact on the environment.

[0059] Then, the prepared finishing media of Comparative Examples 1-6 were tested for hard water adaptability, maximum seizure load, biodegradability, PB value, PD value, and friction coefficient. The test conditions were the same as those of Examples 1-6, and the test results are shown in Table 2 below: Project Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Comparative Example 6 Hard Water Adaptability / mg / L 923 946 955 934 937 941 PB Value / N 755 785 883 834 755 755 PD Value / N 1236 1236 1570 1236 981 981 Friction Coefficient 0.061 0.058 0.058 0.066 0.074 0.076 Biodegradability % 98.1 97.8 96.3 95.1 96.6 96.3 According to the above data, by comparing the data of Examples 1-2 and Comparative Examples 1-2, it can be seen that when only one base oil is used, the hard water adaptability, PB value, PD value, and friction coefficient of the finishing media are all reduced, indicating that adding sucrose stearate and pentaerythritol oleate can play a synergistic role and synergistically improve the hard water adaptability, PB value, PD value, and friction coefficient; however, the biodegradability of the finishing media is reduced, indicating that using two base oils together will lead to a reduction in biodegradability, but generally speaking, the biodegradability is still relatively high.

[0060] According to the above data, by comparing the data of Examples 3-4 and Comparative Examples 3-4, it can be seen that when only lauryl glucamide is used as the surfactant, the PB value and PD value do not change significantly, but compared with only using sodium fatty acid methyl ester sulfonate, the PB value and PD value are higher, while in terms of hard water resistance, friction coefficient, and biodegradability, they are all reduced, indicating that using sodium fatty acid methyl ester sulfonate as an auxiliary surfactant can complement lauryl glucamide in terms of hard water resistance, wear coefficient, and biodegradability, thus playing a synergistic role.

[0061] According to the above data, by comparing the data of Examples 5-6 and Comparative Examples 5-6, it can be seen that when only one corrosion inhibitor is used, the hard water adaptability, PB value, PD value, and friction coefficient are all reduced, while the biodegradability does not change significantly, indicating that using sodium hexadecyl sulfonate and dodecyl trimethyl ammonium chloride can synergistically increase the PB value and PD value, especially the PD value, further indicating that the two can form a denser protective film.

[0062] The above has introduced in detail a finishing medium for aerospace and its preparation method provided by the present invention. The description of specific embodiments is only used to help understand the method and its core idea of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

[0063] It should be particularly noted that: for those not specifying specific experimental steps or conditions in the embodiments, operations or conditions of conventional experimental steps described in the literature in this field can be followed. For reagents or instruments not indicating the manufacturer, they are all conventional reagent products that can be obtained through commercial purchase.

[0064] The above examples are for better further understanding of the present invention, and are not limited to the described optimal implementation manner, and do not constitute a limitation to the content and protection scope of the present invention. Any product identical or similar to the present invention obtained by anyone under the inspiration of the present invention or by combining the features of the present invention with those of other existing technologies falls within the protection scope of the present invention.

Claims

1. A finishing medium for aerospace applications, characterized in that, It comprises the following raw materials in parts by weight: 25 - 40 parts of natural fatty acid ester - based oil, 5 - 12 parts of oiliness agent, 8 - 15 parts of compound surfactant, 1.2 - 5 parts of corrosion inhibitor, and soft water.

2. The finishing medium for aerospace use according to claim 1, characterized in that, The natural fatty acid ester - based oil is an ester intermediate derived from natural oils, including but not limited to one or more combinations of stearate, glycerol stearate, oleate, pentaerythritol oleate, butyl palmitate, and cetyl palmitate.

3. The finishing medium for aerospace use according to claim 1, characterized in that, The oiliness agent is one or more combinations of triethanolamine oleate, diethanolamide oleate, sulfurized oleic acid, tall oil diethanolamide, ricinoleic acid, coconut fatty acid, whale oil fatty acid, palm oil fatty acid, and neodecanoic acid.

4. The finishing medium for aerospace use according to claim 1, wherein The compound surfactant is at least two of α - sulfo fatty acid methyl esters, alkyl polyglycosides, glucamides, alcohol ether carboxylates, monoalkyl phosphates, alkyl glucamides, SP - 20, SP - 40, SP - 80, T - 20, T - 40, and T - 80.

5. The finishing medium for aerospace use according to claim 1, characterized in that, The corrosion inhibitor is one or more combinations of alkynol - type corrosion inhibitors, organic corrosion inhibitors, amine - type corrosion inhibitors, sulfonate corrosion inhibitors, and pyridine - type corrosion inhibitors.

6. The finishing medium for aerospace use according to claim 1, wherein, The finishing medium for aerospace also includes a rust inhibitor, and the rust inhibitor is one or more combinations of organic carboxylic acid alkanolamine salts, polyol esters, and organic carboxylic acid derivatives.

7. The finishing medium for aerospace use according to claim 1, characterized in that, The finishing medium for aerospace also includes a silicon - free defoamer and an environmentally friendly bacteriostatic agent.

8. The finishing medium for aerospace use according to claim 7, characterized in that, The silicon - free defoamer is one or more combinations of glycerol polyoxyethylene ether, polyvinyl alcohol, higher alcohols, and polyether - modified derivatives.

9. The finishing medium for aerospace use according to claim 7, characterized in that, The environmentally friendly bacteriostatic agent is one or more combinations of allicin, tea tree oil, matrine, 1,2 - benzisothiazolin - 3 - one, N,N - dimethyl - N - tetradecylbenzylammonium chloride, and octadecyl dimethyl benzyl ammonium chloride.

10. A method for preparing a finishing medium for aerospace use according to any one of claims 1-9, characterized in that, It includes the following steps: S1. Add the natural fatty acid ester - based oil, oiliness agent, corrosion inhibitor, and rust inhibitor into soft water, and stir for 30 - 60 min to obtain a preliminary mixture. S2. Add the compound surfactant, silicon - free defoamer, and environmentally friendly bacteriostatic agent into the preliminary mixture, and under the condition of 30 - 40 °C, perform ultrasonic treatment for 20 - 40 min, and then let it stand for 10 - 20 min. S3. Cool the solution treated in step S2 to room temperature to obtain the finishing medium for aerospace.