A method for preparing hexagonal boron nitride high-temperature lubricant for aircraft manufacturing

Abstract

The invention relates to the field of dry film lubricants, and discloses a preparation method of a hexagonal boron nitride high-temperature lubricant for aircraft manufacturing. The method comprises the following steps: grinding a powder in a ball mill, putting an organic solvent and a dispersant into a pull cylinder according to a formula, dispersing the powder in a high-speed disperser, adding modified hexagonal boron nitride, modified nano molybdenum disulfide and a functional filler, continuing to disperse the powder, grinding the powder in a high-speed disperser, sampling and testing the coating fineness until it reaches a requirement, stopping the dispersion, adding an adhesive, a defoamer and other auxiliary agents, and continuing to disperse and then filling the powder. The high-temperature lubricant comprises the following components in parts by weight: 18 to 20 parts of modified hexagonal boron nitride, 8 to 12 parts of modified nano molybdenum disulfide, 70 to 75 parts of an organic solvent, 5 to 7 parts of a functional filler, 5 to 10 parts of an adhesive, 1 to 2 parts of a dispersant and 0.3 to 0.5 parts of a defoamer. The invention utilizes the modified hexagonal boron nitride and the modified nano molybdenum disulfide to compound the modified hexagonal boron nitride so that the modified hexagonal boron nitride has good lubrication performance, and also has excellent anti-wear performance and antibacterial performance.

Description

Technical Field

[0001] The invention belongs to the technical field of dry film lubricants, and in particular relates to a method for preparing a hexagonal boron nitride high-temperature lubricant used in aircraft manufacturing. Background Art

[0002] Lubricants are widely used on the friction surfaces of molds and mechanical parts to reduce friction and wear of materials. Compared with conventional grease lubrication, dry film lubricants can be effectively used under high temperature, high load, high vacuum and other environmental conditions. Dry film lubricants are a liquid special lubricant that contains solid lubricants and special solvents evenly dispersed in non-flammable solvents. After coating, a thin layer of lipid-like white translucent lubricating film is formed. Dry film lubrication does not require a lubrication supply system, greatly simplifies the processing technology, avoids lubricant dripping, and reduces wear between parts.

[0003] In the prior art, dry film lubricants are usually made of molybdenum disulfide, graphite powder, etc. dispersed in organic or inorganic binders, coated on the friction surface of molds and mechanical parts, and dried to obtain dry film lubricant coatings. However, after being stored for a period of time, the internal solid lubricant components are prone to precipitation, and the spraying is uneven, which affects the service life and lubrication effect of the lubricant and parts; in addition, during storage, it faces erosion or attack from microorganisms in the environment. Microorganisms can enter the cutting fluid through media such as mixing water and air, and may also cause the growth of microorganisms due to factors such as operators, machine tools and workshop hygiene conditions, causing the lubricant to easily deteriorate and corrode the product. Summary of the invention

[0004] In order to solve the deficiencies mentioned in the above background technology, the purpose of the present invention is to provide a method for preparing a hexagonal boron nitride high-temperature lubricant for aircraft manufacturing, which utilizes hexagonal boron nitride and nano-molybdenum disulfide to compound so that it has good lubrication properties. At the same time, the surface of hexagonal boron nitride is modified with dopamine and then grafted with nano-silicon dioxide to give the high-temperature lubricant excellent anti-wear properties, and the nano-molybdenum disulfide grafted with an antibacterial modifier can give the material good antibacterial properties.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] A method for preparing a hexagonal boron nitride high-temperature lubricant for aircraft manufacturing comprises the following steps:

[0007] The powder is ball-milled to 3~5μm in a ball mill. The organic solvent and dispersant are added into the pull cylinder according to the formula. The powder is dispersed in a high-speed disperser for 20~30min. Modified hexagonal boron nitride, modified nano molybdenum disulfide and functional filler are added. The dispersion is continued for 1.5~2h. After the dispersion is completed, the powder is ground in a high-speed disperser for 4~6h. During this period, samples are continuously taken to detect the fineness of the coating. When the fineness reaches below 500 nanometers, the dispersion is stopped, and the adhesive and defoamer are added. The powder is dispersed for about 1h before filling.

[0008] The hexagonal boron nitride high-temperature lubricant used in aircraft manufacturing comprises the following components in parts by weight: 18-20 parts of modified hexagonal boron nitride, 8-12 parts of modified nano molybdenum disulfide, 70-75 parts of organic solvent, 5-7 parts of functional filler, 5-10 parts of binder, 1-2 parts of dispersant and 0.3-0.5 parts of defoamer; the modified hexagonal boron nitride is prepared by surface-modifying hexagonal boron nitride with dopamine and then grafting nano silicon dioxide; the modified nano molybdenum disulfide is an antibacterial modifier grafted onto nano molybdenum disulfide; the antibacterial modifier molecule comprises an isothiazolinone structure and a siloxane structure.

[0009] Further preferably, the preparation method of modified hexagonal boron nitride comprises the following steps:

[0010] S1. Dissolve tris(hydroxymethyl)aminomethane in deionized water, add 0.1 mol / L hydrochloric acid to adjust the pH to 8-9, then add dopamine hydrochloride to the above solution and stir to mix evenly, then add hexagonal boron nitride powder, stir to mix, then ultrasonically treat for 2-4 hours, and react at 60°C for 24 hours, centrifuge, wash, filter and dry the product to obtain polydopamine-modified hexagonal boron nitride;

[0011] S2, adding nano-silica powder to a mixture of anhydrous ethanol and deionized water in a volume ratio of 10:1, stirring evenly and then ultrasonically dispersing for 1-2 hours to obtain a nano-silica dispersion, then adding 3-aminopropyltrimethoxysilane to the dispersion, stirring and heating to 80° C. for reaction for 3-5 hours, centrifugally washing, filtering and drying to obtain silane-modified nano-silica;

[0012] S3. Add the polydopamine-modified hexagonal boron nitride to N,N-dimethylformamide and ultrasonically treat it for 20 to 40 minutes to form a uniform suspension, then add the silane-modified nano-silica obtained in step S2 to the above suspension, ultrasonically treat it again for 20 to 40 minutes, then heat it to 100 to 110° C., stir and react for 4 to 6 hours, centrifuge, wash, filter and dry the product to obtain the modified hexagonal boron nitride.

[0013] More preferably, in step S1, the molar ratio of dopamine hydrochloride to hexagonal boron nitride is 1:14-16.

[0014] Further preferably, in step S2, the mass ratio of the nano-silica powder to 3-aminopropyltrimethoxysilane is 12-15:1.

[0015] Further preferably, in step S3, the mass ratio of the polydopamine-modified hexagonal boron nitride to the silane-modified nano-silicon dioxide is 3-5:1.

[0016] Further preferably, the preparation method of modified nano molybdenum disulfide comprises the following steps:

[0017] (1) 1,2-benzisothiazol-3-one, potassium carbonate and N,N-dimethylformamide are mixed, and then tribromoneopentyl alcohol is slowly added at room temperature, and the mixture is heated to 70°C and stirred for 10-12 hours. After the reaction is completed, deionized water is added to dissolve the product, and then the mixed solution is extracted with ethyl acetate. Anhydrous magnesium sulfate is added to the extract to dehydrate it, and then filtered. The filtrate is evaporated to remove the ethyl acetate, and finally purified by a chromatographic column to obtain an isothiazolinyl derivative;

[0018] (2) adding the isothiazolinone derivative obtained in step (1) to tetrahydrofuran and triethylamine, stirring to dissolve the isothiazolinone derivative, then uniformly adding 3-glycidyloxypropyltriethoxysilane dropwise, heating to 50-70° C. to react for 4-6 hours, then cooling, distilling under reduced pressure, and filtering to remove triethylamine hydrochloride and tetrahydrofuran, to obtain an antibacterial modifier;

[0019] (3) Add nano-molybdenum disulfide to a mixture of anhydrous ethanol and deionized water in a volume ratio of 10:1, ultrasonically disperse for 10-15 minutes, adjust the solution pH to 4 with aqueous hydrochloric acid, then slowly add the antibacterial modifier to the nano-molybdenum disulfide dispersion, ultrasonically disperse for 5-10 minutes, heat to 80-90°C and keep warm for 3-5 hours, filter after cooling, wash, and dry to obtain modified nano-molybdenum disulfide.

[0020] More preferably, in step (1), the molar ratio of 1,2-benzisothiazol-3-one to tribromoneopentyl alcohol is 3-4:1.

[0021] More preferably, in step (2), the molar ratio of the thiazoline derivative to 3-glycidyloxypropyltriethoxysilane is 1:1-2.

[0022] Further preferably, in step (3), nano-molybdenum disulfide is added to a mixture of anhydrous ethanol and deionized water at a solid-liquid ratio of 1:5-8, and the mass ratio of nano-molybdenum disulfide to the antibacterial modifier is 8-10:1.

[0023] Further preferably, the organic solvent includes at least one of ethanol, acetone, and isopropanol, the functional filler includes at least one of aluminum oxide, magnesium oxide, and fumed silica, the binder includes at least one of water-based polyamide-imide, inorganic phosphate, and silicate, the dispersant is at least one of a cationic surfactant, a nonionic surfactant, and an amphoteric surfactant, and the defoamer is C7-9 alcohol or polydimethylsiloxane.

[0024] Beneficial effects of the present invention:

[0025] The hexagonal boron nitride high temperature lubricant for aircraft manufacturing of the present invention is compounded with hexagonal boron nitride and nano molybdenum disulfide to have good lubrication performance. At the same time, the hexagonal boron nitride surface is modified with dopamine and then grafted with nano silicon dioxide, which can give the high temperature lubricant excellent anti-wear performance. The nano molybdenum disulfide grafted with an antibacterial modifier can give the material good antibacterial properties. Among them, the modified hexagonal boron nitride first forms a polydopamine coating through self-polymerization of the hexagonal boron nitride surface by dopamine, and the functional groups given to the surface of the hexagonal boron nitride are conducive to further modification reactions, and the structure and performance of the hexagonal boron nitride can be maintained. Then, the composite nano silicon dioxide on the surface of the polydopamine layer can effectively improve the stability, corrosion resistance and wear resistance of the nano composite material. Modified nano-molybdenum disulfide is prepared by the reaction of 1,2-benzisothiazol-3-one and tribromoneopentyl alcohol to obtain an isothiazolinone derivative containing an alcoholic hydroxyl group and three benzisothiazolone units, which is then reacted with a terminal epoxy silane coupling agent to obtain an antibacterial modifier, which is finally grafted onto the surface of nano-molybdenum disulfide. On the one hand, it can improve the dispersibility of nano-molybdenum disulfide in the matrix, so that it can better play a lubricating role together with hexagonal boron nitride. On the other hand, the benzisothiazolone structure rich on its surface can make the high-temperature lubricant have good antibacterial properties, thereby ensuring that it will not deteriorate during long-term storage. DETAILED DESCRIPTION

[0026] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] Example 1 A method for preparing modified hexagonal boron nitride comprises the following steps:

[0028] S1. Dissolve 12.1g tris(hydroxymethyl)aminomethane in 80ml deionized water, add 0.1mol / L hydrochloric acid to adjust the pH to 8-9, then add deionized water to make up to 100ml, then add 4.8g dopamine hydrochloride to the above solution and stir to mix evenly, then add 9.3g hexagonal boron nitride powder, stir to mix, then ultrasonically treat for 3h, and react at 60℃ for 24h, centrifuge, wash, filter and dry the product to obtain polydopamine-modified hexagonal boron nitride;

[0029] S2, adding 7.5g of nano-silica powder to a mixture of 50ml of anhydrous ethanol and deionized water in a volume ratio of 10:1, stirring evenly and ultrasonically dispersing for 1.5h to obtain a nano-silica dispersion, then adding 0.5g of 3-aminopropyltrimethoxysilane to the dispersion, stirring and heating to 80°C for 4h, centrifugally washing, filtering and drying to obtain silane-modified nano-silica;

[0030] S3. Add 4.7 g of polydopamine-modified hexagonal boron nitride to 50 ml of N,N-dimethylformamide and ultrasonically treat for 30 minutes to form a uniform suspension. Then add 1.2 g of silane-modified nano-silica obtained in step S2 to the above suspension, ultrasonically treat again for 30 minutes, and then heat to 105°C and stir to react for 5 hours. The product is centrifuged, washed, filtered and dried to obtain the modified hexagonal boron nitride.

[0031] Example 2 A method for preparing modified nano-molybdenum disulfide comprises the following steps:

[0032] (1) 5.3 g of 1,2-benzisothiazol-3-one, 0.5 g of potassium carbonate and 30 ml of N,N-dimethylformamide were mixed, and then 3.2 g of tribromoneopentyl alcohol was slowly added at room temperature, and the mixture was heated to 70°C and stirred for 12 h. After the reaction, deionized water was added to dissolve the product, and the mixed solution was extracted with ethyl acetate. Anhydrous magnesium sulfate was added to the extract to dehydrate it, and then it was filtered. The filtrate was evaporated to remove the ethyl acetate, and finally purified by a chromatographic column to obtain an isothiazolinyl derivative;

[0033] (2) 5.3 g of the isothiazolinone derivative obtained in step (1) was added to tetrahydrofuran and triethylamine, and the isothiazolinone derivative was dissolved by stirring, and then 4.2 g of 3-glycidyloxypropyltriethoxysilane was added dropwise at a uniform rate, and the temperature was raised to 60° C. to react for 5 h, and then the mixture was cooled, and triethylamine hydrochloride and tetrahydrofuran were removed by vacuum distillation and suction filtration to obtain an antibacterial modifier;

[0034] (3) Add 9.8 g of nano-molybdenum disulfide into a mixture of 80 ml of anhydrous ethanol and deionized water in a volume ratio of 10:1, and ultrasonically disperse for 10-15 min. Adjust the pH of the solution to 4 with aqueous hydrochloric acid. Then slowly add 1.2 g of the antibacterial modifier into the nano-molybdenum disulfide dispersion, and ultrasonically disperse for 8 min. Heat to 85 °C and keep the reaction for 4 h. After cooling, filter, wash, and dry to obtain modified nano-molybdenum disulfide.

[0035] Example 3 A hexagonal boron nitride high-temperature lubricant for aircraft manufacturing, comprising the following components in parts by weight: 18 parts of modified hexagonal boron nitride, 12 parts of modified nano molybdenum disulfide, 70 parts of ethanol, 7 parts of magnesium oxide, 5 parts of water-based polyamide-imide, 2 parts of amphoteric surfactant, and 0.3 parts of C7-9 alcohol; the modified hexagonal boron nitride is prepared in Example 1, and the modified nano molybdenum disulfide is prepared in Example 2;

[0036] The preparation method of the above-mentioned hexagonal boron nitride high-temperature lubricant comprises the following steps:

[0037] The powder is ball-milled to 5μm in a ball mill. Ethanol and amphoteric surfactant are added into a pull cylinder according to the formula and dispersed in a high-speed disperser for 30 minutes. Modified hexagonal boron nitride, modified nano molybdenum disulfide and magnesium oxide are added and the dispersion is continued for 1.5 hours. After the dispersion is completed, it is ground in a high-speed disperser for 6 hours. During this period, samples are continuously taken to detect the fineness of the coating until it reaches 2μm. The dispersion is stopped, and water-based polyamide-imide and C7-9 alcohol are added. The dispersion is continued for about 1 hour before filling.

[0038] Example 4 A hexagonal boron nitride high-temperature lubricant for aircraft manufacturing, comprising the following components in parts by weight: 20 parts of modified hexagonal boron nitride, 8 parts of modified nano molybdenum disulfide, 75 parts of acetone, 5 parts of aluminum oxide, 10 parts of inorganic phosphate, 1 part of cationic surfactant, and 0.5 parts of polydimethylsiloxane; the modified hexagonal boron nitride is prepared in Example 1, and the modified nano molybdenum disulfide is prepared in Example 2;

[0039] The preparation method of the above-mentioned hexagonal boron nitride high-temperature lubricant comprises the following steps:

[0040] The powder is ball-milled to 3μm in a ball mill. Acetone and cationic surfactant are put into a pull cylinder according to the formula and dispersed in a high-speed disperser for 20 minutes. Modified hexagonal boron nitride, modified nano molybdenum disulfide and alumina are added and the dispersion is continued for 2 hours. After the dispersion is completed, it is ground in a high-speed disperser for 4 hours. During this period, samples are continuously taken to detect the fineness of the coating until it reaches 1μm. The dispersion is stopped, and additives such as inorganic phosphates and polydimethylsiloxane are added. The dispersion is continued for about 1 hour before filling.

[0041] Example 5 A hexagonal boron nitride high-temperature lubricant for aircraft manufacturing, comprising the following components in parts by weight: 19 parts of modified hexagonal boron nitride, 10 parts of modified nano molybdenum disulfide, 73 parts of isopropanol, 6 parts of fumed silica, 8 parts of silicate, 1.5 parts of nonionic surfactant, and 0.4 parts of polydimethylsiloxane; the modified hexagonal boron nitride is prepared in Example 1, and the modified nano molybdenum disulfide is prepared in Example 2;

[0042] The preparation method of the above-mentioned hexagonal boron nitride high-temperature lubricant comprises the following steps:

[0043] The powder is ball-milled to 4μm in a ball mill. Isopropyl alcohol and non-ionic surfactant are added into a pull cylinder according to the formula. It is dispersed in a high-speed disperser for 25 minutes. Modified hexagonal boron nitride, modified nano molybdenum disulfide and fumed silica are added. The dispersion is continued for 2 hours. After the dispersion is completed, it is ground in a high-speed disperser for 5 hours. During this period, samples are continuously taken to detect the fineness of the coating. Until it reaches 1μm, the dispersion is stopped, and additives such as silicate and polydimethylsiloxane are added. The dispersion is continued for about 1 hour before filling.

[0044] Comparative Example 1 A hexagonal boron nitride high-temperature lubricant for aircraft manufacturing comprises the following components in parts by weight: 19 parts of hexagonal boron nitride, 10 parts of modified nano molybdenum disulfide, 73 parts of isopropanol, 6 parts of fumed silica, 8 parts of silicate, 1.5 parts of nonionic surfactant, and 0.4 parts of polydimethylsiloxane; the modified nano molybdenum disulfide is prepared in Example 2;

[0045] The preparation method of the above-mentioned hexagonal boron nitride high-temperature lubricant comprises the following steps:

[0046] The powder is ball-milled to 4μm in a ball mill. Isopropyl alcohol and non-ionic surfactant are added into a pull cylinder according to the formula. It is dispersed in a high-speed disperser for 25 minutes. Hexagonal boron nitride, modified nano molybdenum disulfide and fumed silica are added and the dispersion is continued for 2 hours. After the dispersion is completed, it is ground in a high-speed disperser for 5 hours. During this period, samples are continuously taken to detect the fineness of the coating. When it reaches 1μm, the dispersion is stopped, and additives such as silicate and polydimethylsiloxane are added. The dispersion is continued for about 1 hour before filling.

[0047] Comparative Example 2 A hexagonal boron nitride high-temperature lubricant for aircraft manufacturing comprises the following components in parts by weight: 19 parts of modified hexagonal boron nitride, 10 parts of nano molybdenum disulfide, 73 parts of isopropanol, 6 parts of fumed silica, 8 parts of silicate, 1.5 parts of nonionic surfactant, and 0.4 parts of polydimethylsiloxane; the modified hexagonal boron nitride is prepared in Example 1;

[0048] The preparation method of the above-mentioned hexagonal boron nitride high-temperature lubricant comprises the following steps:

[0049] The powder is ball-milled to 4μm in a ball mill. Isopropyl alcohol and non-ionic surfactant are added into a pull cylinder according to the formula. It is dispersed in a high-speed disperser for 25 minutes. Modified hexagonal boron nitride, nano molybdenum disulfide and fumed silica are added and the dispersion is continued for 2 hours. After the dispersion is completed, it is ground in a high-speed disperser for 5 hours. During this period, samples are continuously taken to detect the fineness of the coating. When it reaches 1μm, the dispersion is stopped, and auxiliary agents such as silicate and polydimethylsiloxane are added. The dispersion is continued for about 1 hour before filling.

[0050] Performance Testing

[0051] The high temperature lubricants prepared in Examples 3 to 5 and Comparative Examples 1 to 2 were subjected to performance testing:

[0052] (1) Antibacterial performance test: Refer to ASTM D3946-92 standard for antibacterial performance test. First, add 900mL of high-temperature lubricant to the beaker, then add 100mL of cultured bacteria and nutrients required by microorganisms such as iron filings, corn starch, casein, etc. and stir evenly. Place the beaker in a 30℃ constant temperature water bath, and ventilate the sample. The cycle is 7 days, with 5 days of ventilation and 2 days of air stop in each cycle. During this process, add sterile water to make up for the loss caused by evaporation, and regularly detect the total number of bacteria and fungi in the sample. The sample deterioration index is: total bacteria count>10 7 cfu / mL, total fungal count>10 2 cfu / mL, and recorded the time required for the sample to deteriorate. The data results are shown in Table 1.

[0053] (2) Wear resistance test: The test was carried out in accordance with GB / T 3142-2019, and the data results are shown in Table 1.

[0054] Table 1 Test results of sample performance.

[0055]

[0056] It can be seen from the data in Table 1 that the cutting fluids prepared in Examples 3 to 5 of the present invention have excellent lubrication, wear resistance and antibacterial properties. The anti-wear modifier added in Comparative Example 1 is prepared by mixing nano hexagonal boron nitride and dibasic acid ionic liquid only, and the hexagonal boron nitride added in Comparative Example 1 is not modified. The maximum no-seizure load measured in Comparative Examples 1 to 2 is lower than that in Examples 3 to 5, indicating that the grafting of nano silicon dioxide after the surface modification of hexagonal boron nitride with dopamine can give high-temperature lubricants excellent anti-wear properties. In Comparative Example 2, no modified nano molybdenum disulfide is added, and the measured deterioration time is significantly reduced compared with Examples 3 to 5, indicating that the nano molybdenum disulfide grafted with the antibacterial modifier of the present invention can give the material good antibacterial properties.

[0057] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer 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.

[0058] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. A method for preparing a hexagonal boron nitride high-temperature lubricant for aircraft manufacturing, characterized in that: The following steps are involved: The powder is ball-milled to 3~5μm in a ball mill. The organic solvent and dispersant are added into the pull cylinder according to the formula. The powder is dispersed in a high-speed disperser for 20~30min. Modified hexagonal boron nitride, modified nano molybdenum disulfide and functional filler are added. The powder is dispersed for 1.5~2h. After the dispersion is completed, the powder is ground in a high-speed disperser for 4~6h. During this period, samples are continuously taken to detect the fineness of the material in the high-speed disperser. When the fineness reaches 1μm, the dispersion is stopped, and the binder and defoamer are added. The powder is dispersed for 1h and then filled. The hexagonal boron nitride high-temperature lubricant for aircraft manufacturing comprises the following components in parts by weight: 18-20 parts of modified hexagonal boron nitride, 8-12 parts of modified nano molybdenum disulfide, 70-75 parts of organic solvent, 5-7 parts of functional filler, 5-10 parts of binder, 1-2 parts of dispersant, and 0.3-0.5 parts of defoamer; the modified hexagonal boron nitride is prepared by surface-modifying hexagonal boron nitride with dopamine and then grafting nano silicon dioxide, the modified nano molybdenum disulfide is an antibacterial modifier grafted with nano molybdenum disulfide, and the antibacterial modifier comprises an isothiazolinone structure and a siloxane structure; The preparation method of the modified nano molybdenum disulfide comprises the following steps: (1) 1,2-benzisothiazol-3-one, potassium carbonate and N,N-dimethylformamide are mixed, and then tribromoneopentyl alcohol is slowly added at room temperature, and the mixture is heated to 70°C and stirred for 10-12 hours. After the reaction is completed, deionized water is added to dissolve the product, and then the mixed solution is extracted with ethyl acetate. Anhydrous magnesium sulfate is added to the extract to dehydrate it, and then filtered. The filtrate is evaporated to remove the ethyl acetate, and finally purified by a chromatographic column to obtain an isothiazolinyl derivative; (2) adding the isothiazolinone derivative obtained in step (1) to tetrahydrofuran and triethylamine, stirring to dissolve the isothiazolinone derivative, then uniformly adding 3-glycidyloxypropyltriethoxysilane dropwise, heating to 50-70° C. to react for 4-6 hours, then cooling, distilling under reduced pressure, and filtering to remove triethylamine hydrochloride and tetrahydrofuran, to obtain an antibacterial modifier; (3) Add nano-molybdenum disulfide to a mixture of anhydrous ethanol and deionized water in a volume ratio of 10:1, ultrasonically disperse for 10-15 minutes, adjust the solution pH to 4 with aqueous hydrochloric acid, then slowly add the antibacterial modifier to the nano-molybdenum disulfide dispersion, ultrasonically disperse for 5-10 minutes, heat to 80-90°C and keep warm for 3-5 hours, filter after cooling, wash, and dry to obtain modified nano-molybdenum disulfide.

2. The method for preparing the hexagonal boron nitride high temperature lubricant for aircraft manufacturing according to claim 1, characterized in that: The preparation method of the modified hexagonal boron nitride comprises the following steps: S1. Dissolve tris(hydroxymethyl)aminomethane in deionized water, add 0.1 mol / L hydrochloric acid to adjust the pH to 8-9, then add dopamine hydrochloride to the above solution and stir to mix evenly, then add hexagonal boron nitride powder, stir to mix, then ultrasonically treat for 2-4 hours, and react at 60°C for 24 hours, centrifuge, wash, filter and dry the product to obtain polydopamine-modified hexagonal boron nitride; S2, adding nano-silica powder to a mixture of anhydrous ethanol and deionized water in a volume ratio of 10:1, stirring evenly and then ultrasonically dispersing for 1-2 hours to obtain a nano-silica dispersion, then adding 3-aminopropyltrimethoxysilane to the dispersion, stirring and heating to 80° C. for reaction for 3-5 hours, centrifugally washing, filtering and drying to obtain silane-modified nano-silica; S3. Add the polydopamine-modified hexagonal boron nitride to N,N-dimethylformamide and ultrasonically treat it for 20 to 40 minutes to form a uniform suspension, then add the silane-modified nano-silica obtained in step S2 to the above suspension, ultrasonically treat it again for 20 to 40 minutes, then heat it to 100 to 110° C., stir and react for 4 to 6 hours, centrifuge, wash, filter and dry the product to obtain the modified hexagonal boron nitride.

3. The method for preparing the hexagonal boron nitride high temperature lubricant for aircraft manufacturing according to claim 2, characterized in that: In step S1, the molar ratio of dopamine hydrochloride to hexagonal boron nitride is 1:14-16.

4. The method for preparing the hexagonal boron nitride high temperature lubricant for aircraft manufacturing according to claim 2, characterized in that: In the step S2, the mass ratio of the nano-silicon dioxide powder to 3-aminopropyltrimethoxysilane is 12-15:

1.

5. The method for preparing the hexagonal boron nitride high temperature lubricant for aircraft manufacturing according to claim 2, characterized in that: In the step S3, the mass ratio of the polydopamine-modified hexagonal boron nitride to the silane-modified nano-silicon dioxide is 3-5:

1.

6. The method for preparing the hexagonal boron nitride high temperature lubricant for aircraft manufacturing according to claim 1, characterized in that: In the step (1), the molar ratio of 1,2-benzisothiazol-3-one to tribromoneopentyl alcohol is 3-4:

1.

7. The method for preparing the hexagonal boron nitride high temperature lubricant for aircraft manufacturing according to claim 1, characterized in that: In the step (2), the molar ratio of the thiazoline derivative to 3-glycidyloxypropyltriethoxysilane is 1:1-2.

8. The method for preparing the hexagonal boron nitride high temperature lubricant for aircraft manufacturing according to claim 1, characterized in that: In the step (3), the nano-molybdenum disulfide is added to a mixture of anhydrous ethanol and deionized water at a solid-liquid ratio of 1:5-8, and the mass ratio of the nano-molybdenum disulfide to the antibacterial modifier is 8-10:

1.

9. The method for preparing the hexagonal boron nitride high temperature lubricant for aircraft manufacturing according to claim 1, characterized in that: The organic solvent includes at least one of ethanol, acetone, and isopropanol; the functional filler includes at least one of aluminum oxide, magnesium oxide, and fumed silica; the binder includes at least one of water-based polyamide-imide, inorganic phosphate, and silicate; the dispersant is at least one of a cationic surfactant, a nonionic surfactant, and an amphoteric surfactant; and the defoamer is C7-9 alcohol or polydimethylsiloxane.

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