Wear-resistant durable fastener and processing technology thereof

Abstract

The invention discloses a wear-resistant durable fastener and a processing technology thereof, and relates to the technical field of fasteners, and a preparation method of the wear-resistant durable fastener comprises the following steps: adding loaded modified boron nitride nanosheets into absolute ethyl alcohol, adding an absolute ethyl alcohol solution of a corrosion inhibitor, stirring at room temperature, heating for reflux reaction, centrifuging after cooling, collecting precipitates, and freeze-drying to obtain the wear-resistant durable fastener. The functional filler is obtained; the functionalized filler is added into absolute ethyl alcohol, ultrasonic dispersion is carried out, 2, 2 '-diaminodiphenyl disulfide is added, heating and stirring are carried out, E51 epoxy resin, polypropylene glycol diglycidyl ether and an anti-aging repairing auxiliary agent are added, heating reaction is carried out, and the wear-resistant and durable coating is obtained; and the surface of the fastener is subjected to micro-arc oxidation treatment, the surface of the fastener is spin-coated with the wear-resistant and durable coating, heating and curing are conducted, and the wear-resistant and durable fastener is obtained.

Description

Technical Field

[0001] The present invention relates to the technical field of fasteners, and particularly to an anti-wear and durable fastener and its processing technology. Background Art

[0002] Fasteners, as key components for mechanical connections, are widely used in fields such as aerospace, automotive manufacturing, and ocean engineering. Their performance directly affects the safety and service life of equipment. Traditional fasteners often improve surface performance through processes such as galvanizing, phosphating, or coating with ordinary epoxy resins. However, these methods have significant limitations. For example, the galvanized layer has low hardness and is prone to wear failure under frequent friction; the phosphating treatment has insufficient corrosion resistance and is prone to pitting corrosion especially in humid or salt spray environments; although the ordinary epoxy resin coating has a certain protective effect, it lacks self-healing ability and is prone to generating microcracks under long-term exposure to ultraviolet rays or mechanical stress, resulting in a decline in protective performance.

[0003] In recent years, the technology of nano-material modified coatings has provided new ideas for improving the performance of fasteners. Boron nitride nanosheets are used to enhance the wear resistance of coatings due to their layered structure and high thermal conductivity. However, problems such as poor dispersion in the resin matrix and weak interfacial bonding limit their practical applications. In addition, existing coating technologies mostly focus on optimizing single performance and it is difficult to achieve the coordinated improvement of anti-wear, corrosion resistance, and anti-aging. For example, some studies use micro-arc oxidation to generate ceramic films on the metal surface to improve hardness, but do not combine the self-lubricating characteristics of nano-fillers; other studies introduce corrosion inhibitors to improve corrosion resistance, but do not solve the problems of easy loss of corrosion inhibitors or coating aging caused by ultraviolet rays.

[0004] Therefore, it is of great significance to invent an anti-wear and durable fastener. Summary of the Invention

[0005] The purpose of the present invention is to provide an anti-wear and durable fastener and its processing technology to solve the problems raised in the prior art.

[0006] To achieve the above purpose, the present invention provides the following technical solutions:

[0007] A processing technology for an anti-wear and durable fastener includes the following steps: S1: Add load-modified boron nitride nanosheets into absolute ethanol, add an absolute ethanol solution of a corrosion inhibitor, stir at room temperature for 1 - 1.5 h, heat to 60 - 65 °C for reflux reaction for 4 - 4.5 h, centrifuge after cooling, collect the precipitate, and freeze-dry to obtain a functionalized filler;

[0008] S2: Add the functionalized filler into absolute ethanol, disperse it by ultrasonic wave, add 2,2'-diaminodiphenyl disulfide, heat to 75 - 80 °C and stir for 30 - 45 min, add E51 epoxy resin, polypropylene glycol diglycidyl ether, and anti-aging repair additive, heat to 80 - 85 °C and react for 40 - 45 min to obtain the anti-wear and durable coating;

[0009] S3: Perform micro-arc oxidation treatment on the surface of the fastener, spin-coat the anti-wear and durable coating on the surface of the fastener, heat to 120 - 125 °C and cure for 5 - 5.5 h to obtain the anti-wear and durable fastener.

[0010] Further, the loaded modified boron nitride nanosheets are prepared by loading metal-organic framework-coated benzotriazole particles on the surface of amino-functionalized boron nitride nanosheets.

[0011] Further, in the preparation process of the functionalized filler, the mass ratio of the loaded modified boron nitride nanosheets to the corrosion inhibitor is (0.1 - 0.2):(0.2 - 0.4).

[0012] Further, in the preparation process of the anti-wear and durable coating, the mass ratio of E51 epoxy resin: 2,2'-diaminodiphenyl disulfide: polypropylene glycol diglycidyl ether is 8:5:8; the addition amount of the functionalized filler is 2.5 - 4 wt% of the mass of E51 epoxy resin; the addition amount of the anti-aging repair additive is 0.2 - 0.4 wt% of the mass of E51 epoxy resin.

[0013] Further, the preparation method of the loaded modified boron nitride nanosheets includes the following steps: Add amino-functionalized boron nitride nanosheets and zinc nitrate hexahydrate into methanol, add methanol solutions of 2-methylimidazole and 1-methylimidazole, stir and react for 30 - 36 h, dry at 30 - 32 °C for 4 - 4.5 h, and dry the suspension at 50 - 55 °C to obtain the loaded modified boron nitride nanosheets;

[0014] Further, in the preparation process of the loaded modified boron nitride nanosheets, the mass ratio of amino-functionalized boron nitride nanosheets: zinc nitrate hexahydrate: 2-methylimidazole: 1-methylimidazole is 1.5:7.34:8.21:11.64.

[0015] Further, the preparation method of the amino-functionalized boron nitride nanosheets includes the following steps: Add 2,5-diaminobenzenesulfonic acid into deionized water, stir evenly, add hydroxylated boron nitride nanosheets, perform ultrasonic treatment at room temperature for 30 - 45 min, stir for 1 - 1.5 h, centrifuge after cooling, collect the precipitate, and freeze-dry to obtain the amino-functionalized boron nitride nanosheets;

[0016] Further, in the preparation process of the aminated boron nitride nanosheets, the mass ratio of 2,5-diaminobenzenesulfonic acid to hydroxylated boron nitride nanosheets is (0.1-0.2):(0.2-0.4).

[0017] Further, the preparation method of the corrosion inhibitor includes the following steps:

[0018] Add 1-(3-aminopropyl)imidazole into acetonitrile, stir evenly, add the acetonitrile solution of n-butyl isocyanate, stir evenly, add bromohexadecane, stir and reflux for 4-4.5 h, add the product into ethyl acetate for precipitation, filter, and dry in vacuum to obtain the corrosion inhibitor.

[0019] Further, in the preparation process of the corrosion inhibitor, the molar ratio of 1-(3-aminopropyl)imidazole to n-butyl isocyanate to bromohexadecane is 0.1:0.12:0.15.

[0020] Further, the preparation method of the anti-aging repair aid includes the following steps:

[0021] Under a nitrogen atmosphere, add n-butyl mercaptan into a reaction vessel, add sodium hydride under stirring, react for 1-1.5 h, add N-methylpyrrolidone and UV327 ultraviolet absorber, heat to 186-187 °C and reflux for 18-20 h, cool to room temperature, add deionized water and concentrated hydrochloric acid under stirring, cool in an ice bath, filter, collect the precipitate, wash the precipitate with petroleum ether, and dry in vacuum to obtain the anti-aging repair aid.

[0022] Further, in the preparation process of the anti-aging repair aid, the molar ratio of n-butyl mercaptan to sodium hydride to UV327 ultraviolet absorber is 0.08:0.096:0.02.

[0023] Further, the preparation method of the hydroxylated boron nitride nanosheets includes the following steps: Add hexagonal boron nitride powder and 2M sodium hydroxide aqueous solution into a ball mill, ball mill, collect the ball mill product, wash with hydrochloric acid solution and deionized water, dry in vacuum, disperse in 0.5 mg / mL isopropanol aqueous solution, ultrasonically treat for 1-1.5 h, and centrifuge to obtain the hydroxylated boron nitride nanosheets.

[0024] Further, in the preparation process of the hydroxylated boron nitride nanosheets, the mass ratio of hexagonal boron nitride powder to 2M sodium hydroxide aqueous solution is 50:1.

[0025] Further, the spin coating thickness of the anti-wear and durable coating is 10-300 μm.

[0026] Compared with the prior art, the beneficial effects of the present invention are:

[0027] 1. The present invention forms a uniform microporous ceramic film on the surface of fasteners through micro-arc oxidation treatment, endowing the fasteners with high hardness and low friction coefficient properties, and improving the wear resistance of the fasteners. On this basis, boron nitride nanosheets are further introduced. Through a series of modification treatments on the boron nitride nanosheets, the boron nitride nanosheets modified by 2,5-diaminobenzenesulfonic acid and corrosion inhibitor have good dispersion performance in epoxy resin, which can improve the distribution of shear stress during friction, reduce stress concentration, reduce the depth of wear marks, and form a self-lubricating layer during friction by using its layered structure, reducing the direct contact between the metal on the fastener surface and external force, and further improving the wear resistance of the fasteners.

[0028] 2. The surface of the fasteners of the present invention has a microporous structure obtained by micro-arc oxidation treatment, which can fill the corrosion inhibitor component of epoxy resin therein, having a certain slow-release effect. Cooperating with the metal-organic framework-coated benzopyrazole loaded on the surface of boron nitride nanosheets achieves dual slow-release and dual protection effects. The corrosion inhibitor continuously releases on the metal surface, synergistically with benzotriazole released by the metal-organic framework through pH response, greatly extending the corrosion resistance and service life of the fasteners. At the same time, the maze effect of nano-fillers prolongs the diffusion path of corrosive media, further improving the corrosion resistance of the fasteners.

[0029] 3. The present invention introduces a corrosion inhibitor containing a disulfide bond structure and an ultraviolet absorber (aging-resistant repair additive) containing a disulfide bond structure into epoxy resin, endowing the coating with excellent self-repairing ability. The introduction of the aging-resistant repair additive can not only absorb ultraviolet light and delay the breakage of resin segments in the coating structure, but also the disulfide bond in its structure can be recombined under thermal or mechanical stimulation to repair the microcracks caused by ultraviolet light and maintain the coating denseness, greatly improving the adhesion and aging resistance of the coating, and further improving the durability of the fasteners. Detailed implementation manners

[0030] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of 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.

[0031] In the following examples, all raw materials are commercially available.

[0032] The preparation method of hydroxylated boron nitride nanosheets includes the following steps: Add 5 g of hexagonal boron nitride powder and 0.1 mL of 2 M sodium hydroxide aqueous solution into a ball mill, ball mill, collect the ball mill product, wash it with hydrochloric acid solution and deionized water, vacuum dry, disperse it in an isopropanol aqueous solution of 0.5 mg / mL, ultrasonically treat for 1 h, and centrifuge to obtain hydroxylated boron nitride nanosheets.

[0033] Preparation method of load-modified boron nitride nanosheets, comprising the following steps: adding 150 mg of amino-functionalized boron nitride nanosheets and 734 mg of zinc nitrate hexahydrate into methanol, adding a methanol solution containing 821 mg of 2-methylimidazole and 1164 mg of 1-methylimidazole, stirring and reacting for 30 - 36 h, drying at 30 - 32 °C for 4 - 4.5 h, drying the suspension at 50 - 55 °C to obtain load-modified boron nitride nanosheets.

[0034] Preparation method of amino-functionalized boron nitride nanosheets, comprising the following steps: adding 0.2 g of 2,5-diaminobenzenesulfonic acid into deionized water, stirring evenly, adding 0.4 g of hydroxylated boron nitride nanosheets, performing ultrasonic treatment at room temperature for 30 min, stirring for 1 h, centrifuging after cooling, collecting the precipitate, and freeze-drying to obtain amino-functionalized boron nitride nanosheets.

[0035] Preparation method of corrosion inhibitor, comprising the following steps:

[0036] Adding 0.1 mol of 1-(3-aminopropyl)imidazole into acetonitrile, stirring evenly, adding an acetonitrile solution containing 0.12 mol of n-butyl isocyanate, stirring evenly, adding 0.15 mol of hexadecyl bromide, stirring and refluxing for 4 h, adding the product into ethyl acetate for precipitation, filtering, and vacuum drying to obtain the corrosion inhibitor.

[0037] The preparation method of the anti-aging repair aid comprises the following steps:

[0038] Under a nitrogen atmosphere, adding 0.08 mol of n-butyl mercaptan into a reaction vessel, adding 0.096 mol of sodium hydride under stirring, reacting for 1 h, adding N-methylpyrrolidone and 0.02 mol of UV327 ultraviolet absorber, heating to 186 °C and refluxing for 18 h, cooling to room temperature, adding deionized water and concentrated hydrochloric acid under stirring, cooling in an ice bath, filtering, collecting the precipitate, washing the precipitate with petroleum ether, and vacuum drying to obtain the anti-aging repair aid.

[0039] Example 1: A processing technology of anti-wear and durable fasteners, comprising the following steps: S1: Adding 0.2 g of load-modified boron nitride nanosheets into absolute ethanol, adding an absolute ethanol solution of 0.4 g of corrosion inhibitor, stirring at room temperature for 1 h, heating to 60 °C and refluxing for 4 h, centrifuging after cooling, collecting the precipitate, and freeze-drying to obtain functionalized filler;

[0040] S2: Adding 2 g of functionalized filler into absolute ethanol, ultrasonically dispersing, adding 50 g of 2,2'-diaminodiphenyl disulfide, heating to 75 °C and stirring for 30 min, adding 80 g of E51 epoxy resin, 80 g of polypropylene glycol diglycidyl ether, and 0.16 g of anti-aging repair aid, heating to 80 °C and reacting for 40 - 45 min to obtain anti-wear and durable coating;

[0041] S3: Micro-arc oxidation treatment is carried out on the surface of the fastener, and the anti-wear and durable coating is spin-coated on the surface of the fastener and heated to 120 °C for 5 h of curing to obtain the anti-wear and durable fastener.

[0042] Example 2: A processing technology for an anti-wear and durable fastener, comprising the following steps: S1: 0.2 g of load-modified boron nitride nanosheets are added to absolute ethanol, and an absolute ethanol solution of 0.4 g of corrosion inhibitor is added. Stir at room temperature for 1 h, heat to 60 °C for reflux reaction for 4 h, centrifuge after cooling, collect the precipitate, and freeze-dry to obtain the functionalized filler;

[0043] S2: 2.6 g of the functionalized filler is added to absolute ethanol, ultrasonically dispersed, 50 g of 2,2'-diaminodiphenyl disulfide is added, stirred at 75 °C for 30 min, 80 g of E51 epoxy resin, 80 g of polypropylene glycol diglycidyl ether, and 0.16 g of anti-aging repair aid are added, and the reaction is carried out at 80 °C for 40 - 45 min to obtain the anti-wear and durable coating;

[0044] S3: Micro-arc oxidation treatment is carried out on the surface of the fastener, and the anti-wear and durable coating is spin-coated on the surface of the fastener and heated to 120 °C for 5 h of curing to obtain the anti-wear and durable fastener.

[0045] Example 3: A processing technology for an anti-wear and durable fastener, comprising the following steps: S1: 0.2 g of load-modified boron nitride nanosheets are added to absolute ethanol, and an absolute ethanol solution of 0.4 g of corrosion inhibitor is added. Stir at room temperature for 1 h, heat to 60 °C for reflux reaction for 4 h, centrifuge after cooling, collect the precipitate, and freeze-dry to obtain the functionalized filler;

[0046] S2: 3.2 g of the functionalized filler is added to absolute ethanol, ultrasonically dispersed, 50 g of 2,2'-diaminodiphenyl disulfide is added, stirred at 75 °C for 30 min, 80 g of E51 epoxy resin, 80 g of polypropylene glycol diglycidyl ether, and 0.16 g of anti-aging repair aid are added, and the reaction is carried out at 80 °C for 40 - 45 min to obtain the anti-wear and durable coating;

[0047] S3: Micro-arc oxidation treatment is carried out on the surface of the fastener, and the anti-wear and durable coating is spin-coated on the surface of the fastener and heated to 120 °C for 5 h of curing to obtain the anti-wear and durable fastener.

[0048] Example 4: A processing technology for an anti-wear and durable fastener, comprising the following steps: S1: 0.2 g of load-modified boron nitride nanosheets are added to absolute ethanol, and an absolute ethanol solution of 0.4 g of corrosion inhibitor is added. Stir at room temperature for 1 h, heat to 60 °C for reflux reaction for 4 h, centrifuge after cooling, collect the precipitate, and freeze-dry to obtain the functionalized filler;

[0049] S2: Add 3.2 g of functionalized filler to absolute ethanol, disperse it by ultrasonic wave, add 50 g of 2,2'-diaminodiphenyl disulfide, heat to 75 °C and stir for 30 min, add 80 g of E51 epoxy resin, 80 g of polypropylene glycol diglycidyl ether, and 0.24 g of anti-aging repair additive, heat to 80 °C and react for 40 - 45 min to obtain an anti-wear and durable coating;

[0050] S3: Perform micro-arc oxidation treatment on the surface of the fastener, spin-coat the anti-wear and durable coating on the surface of the fastener, heat to 120 °C and cure for 5 h to obtain an anti-wear and durable fastener.

[0051] Example 5: A processing technology for an anti-wear and durable fastener, including the following steps: S1: Add 0.2 g of load-modified boron nitride nanosheets to absolute ethanol, add an absolute ethanol solution of 0.4 g of corrosion inhibitor, stir at room temperature for 1 h, heat to 60 °C and reflux for 4 h, centrifuge after cooling, collect the precipitate, and freeze-dry to obtain a functionalized filler;

[0052] S2: Add 3.2 g of functionalized filler to absolute ethanol, disperse it by ultrasonic wave, add 50 g of 2,2'-diaminodiphenyl disulfide, heat to 75 °C and stir for 30 min, add 80 g of E51 epoxy resin, 80 g of polypropylene glycol diglycidyl ether, and 0.32 g of anti-aging repair additive, heat to 80 °C and react for 40 - 45 min to obtain an anti-wear and durable coating;

[0053] S3: Perform micro-arc oxidation treatment on the surface of the fastener, spin-coat the anti-wear and durable coating on the surface of the fastener, heat to 120 °C and cure for 5 h to obtain an anti-wear and durable fastener.

[0054] Comparative Example 1: A processing technology for an anti-wear and durable fastener, including the following steps: S1: Add 0.2 g of load-modified boron nitride nanosheets to absolute ethanol, add an absolute ethanol solution of 0.4 g of corrosion inhibitor, stir at room temperature for 1 h, heat to 60 °C and reflux for 4 h, centrifuge after cooling, collect the precipitate, and freeze-dry to obtain a functionalized filler;

[0055] S2: Add 2 g of functionalized filler to absolute ethanol, disperse it by ultrasonic wave, add 50 g of 2,2'-diaminodiphenyl disulfide, heat to 75 °C and stir for 30 min, add 80 g of E51 epoxy resin, 80 g of polypropylene glycol diglycidyl ether, and 0.16 g of anti-aging repair additive, heat to 80 °C and react for 40 - 45 min to obtain an anti-wear and durable coating;

[0056] S3: Spin-coat the anti-wear and durable coating on the surface of the fastener, heat to 120 °C and cure for 5 h to obtain an anti-wear and durable fastener.

[0057] Comparative Example 2: A processing technology for wear-resistant and durable fasteners, comprising the following steps: S1: Add 0.2 g of boron nitride nanosheets to absolute ethanol, add an absolute ethanol solution of 0.4 g of corrosion inhibitor, stir at room temperature for 1 h, heat to 60 °C and reflux for 4 h, centrifuge after cooling, collect the precipitate, and freeze-dry to obtain functionalized filler;

[0058] S2: Add 2 g of functionalized filler to absolute ethanol, ultrasonically disperse, add 50 g of 2,2'-diaminodiphenyl disulfide, heat to 75 °C and stir for 30 min, add 80 g of E51 epoxy resin, 80 g of polypropylene glycol diglycidyl ether, and 0.16 g of anti-aging repair additive, heat to 80 °C and react for 40 - 45 min to obtain wear-resistant and durable coating;

[0059] S3: Perform micro-arc oxidation treatment on the surface of the fastener, spin-coat the wear-resistant and durable coating on the surface of the fastener, heat to 120 °C and cure for 5 h to obtain wear-resistant and durable fastener.

[0060] Comparative Example 3: A processing technology for wear-resistant and durable fasteners, comprising the following steps: S1: Add 2 g of load-modified boron nitride nanosheets to absolute ethanol, ultrasonically disperse, add 50 g of 2,2'-diaminodiphenyl disulfide, heat to 75 °C and stir for 30 min, add 80 g of E51 epoxy resin, 80 g of polypropylene glycol diglycidyl ether, and 0.16 g of anti-aging repair additive, heat to 80 °C and react for 40 - 45 min to obtain wear-resistant and durable coating;

[0061] S2: Perform micro-arc oxidation treatment on the surface of the fastener, spin-coat the wear-resistant and durable coating on the surface of the fastener, heat to 120 °C and cure for 5 h to obtain wear-resistant and durable fastener.

[0062] Comparative Example 4: A processing technology for wear-resistant and durable fasteners, comprising the following steps: S1: Add 0.2 g of load-modified boron nitride nanosheets to absolute ethanol, add an absolute ethanol solution of 0.4 g of corrosion inhibitor, stir at room temperature for 1 h, heat to 60 °C and reflux for 4 h, centrifuge after cooling, collect the precipitate, and freeze-dry to obtain functionalized filler;

[0063] S2: Add 2 g of functionalized filler to absolute ethanol, ultrasonically disperse, add 50 g of 2,2'-diaminodiphenyl disulfide, heat to 75 °C and stir for 30 min, add 80 g of E51 epoxy resin, 80 g of polypropylene glycol diglycidyl ether, heat to 80 °C and react for 40 - 45 min to obtain wear-resistant and durable coating;

[0064] S3: Perform micro-arc oxidation treatment on the surface of the fastener, spin-coat the wear-resistant and durable coating on the surface of the fastener, heat to 120 °C and cure for 5 h to obtain wear-resistant and durable fastener.

[0065] Experiment: Anti-wear performance test: Use ball-disc friction tester, load 10N, frequency 2Hz, calculate the wear volume by three-dimensional profiler, according to formula W r =V / (F·L) Calculate wear rate (mm 3 / N·m).

[0066] Corrosion resistance test: According to ASTM B117 standard, 5% NaCl solution, 35°C, calculate the corrosion area after 30 days.

[0067] Anti-aging performance test: According to GB / T 14522 standard, UVB-313 lamp irradiation (0.76W / m 2 ), and the yellowing index (ΔYI) was measured after 1000 h of circulation.

[0068] Self-repairing performance test: For the fasteners prepared in Examples 1-3, scratches were made on the surface of the wear-resistant and durable fasteners with a paper cutter, and the fasteners were placed in a 120° C. environment for 3 hours to observe the repair of the fastener surface coating.

[0069] The experimental results are shown in Table 1 below.

[0070] Table 1 Wear-resistant and durable fastener performance test data

[0071] <![CDATA[Wear rate / mm 3 / N·m]]> Corrosion area / % Yellowing index ΔYI Self-healing performance Example 1 1.2 1.8 1.3 The coating is intact and has no scratches Example 2 1.0 1.5 1.1 The coating is intact and has no scratches Example 3 0.8 1.2 1.0 The coating is intact and has no scratches Example 4 0.7 1.1 0.9 The coating is intact and has no scratches Example 5 0.7 1.0 0.8 The coating is intact and has no scratches Comparative example 1 3.5 12.5 5.2 - Comparative example 2 2.8 8.7 4.8 - Comparative example 3 2.2 6.3 3.5 - Comparative example 4 1.9 5.0 6.1 -

[0072] Conclusion: The wear-resistant and durable fasteners prepared by the present invention have excellent wear resistance, corrosion resistance and aging resistance.

[0073] In Comparative Example 1, the surface of the fastener was not subjected to micro-arc oxidation treatment, resulting in reduced wear resistance and corrosion resistance.

[0074] In Comparative Example 2, boron nitride nanosheets that have not been subjected to loading modification treatment are used, and their dispersion performance in epoxy resin is reduced, resulting in reduced wear resistance and corrosion resistance.

[0075] In Comparative Example 3, the surface of the loaded modified boron nitride nanosheets was not subjected to secondary modification treatment with a corrosion inhibitor, and its dispersibility in the epoxy resin was reduced, resulting in reduced wear resistance and corrosion resistance.

[0076] In Comparative Example 4, no anti-aging repair agent was added, resulting in reduced corrosion resistance and anti-aging performance.

[0077] It is obvious to those skilled in the art that the present invention is not limited to the details of the above-described exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, in all respects, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention.

Claims

1. A processing technology for wear-resistant and durable fasteners, characterized in that: It includes the following steps: S1: Add the load-modified boron nitride nanosheets into absolute ethanol, add the absolute ethanol solution of the corrosion inhibitor, stir at room temperature for 1 - 1.5 h, heat to 60 - 65 °C for reflux reaction for 4 - 4.5 h, centrifuge after cooling, collect the precipitate, and freeze-dry to obtain the functionalized filler; S2: Add the functionalized filler into absolute ethanol, ultrasonically disperse it, add 2,2'-diaminodiphenyl disulfide, heat to 75 - 80 °C and stir for 30 - 45 min, add E51 epoxy resin, polypropylene glycol diglycidyl ether, and anti-aging repair aid, heat to 80 - 85 °C and react for 40 - 45 min to obtain the anti-wear and durable coating; S3: Perform micro-arc oxidation treatment on the surface of the fastener, spin-coat the anti-wear and durable coating on the surface of the fastener, heat to 120 - 125 °C for curing for 5 - 5.5 h to obtain the anti-wear and durable fastener. The load-modified boron nitride nanosheets are prepared by loading metal-organic framework-coated benzotriazole particles on the surface of amino-functionalized boron nitride nanosheets.

2. The processing technology of an anti-wear and durable fastener according to claim 1, characterized in that: During the preparation process of the functionalized filler, the mass ratio of the load-modified boron nitride nanosheets to the corrosion inhibitor is (0.1 - 0.2):(0.2 - 0.4).

3. The processing technology of an anti-wear and durable fastener according to claim 1, characterized in that: During the preparation process of the anti-wear and durable coating, the mass ratio of E51 epoxy resin:2,2'-diaminodiphenyl disulfide:polypropylene glycol diglycidyl ether is 8:5:8; the addition amount of the functionalized filler is 2.5 - 4 wt% of the mass of E51 epoxy resin; the addition amount of the anti-aging repair aid is 0.2 - 0.4 wt% of the mass of E51 epoxy resin.

4. The processing technology of an anti-wear and durable fastener according to claim 1, characterized in that: The preparation method of the load-modified boron nitride nanosheets includes the following steps: Add amino-functionalized boron nitride nanosheets and zinc nitrate hexahydrate into methanol, add the methanol solution of 2-methylimidazole and 1-methylimidazole, stir and react for 30 - 36 h, dry at 30 - 32 °C for 4 - 4.5 h, and dry the suspension at 50 - 55 °C to obtain the load-modified boron nitride nanosheets; During the preparation process of the load-modified boron nitride nanosheets, the mass ratio of amino-functionalized boron nitride nanosheets:zinc nitrate hexahydrate:2-methylimidazole:1-methylimidazole is 1.5:7.34:8.21:11.

64.

5. The processing technology of an anti-wear and durable fastener according to claim 4, characterized in that: The preparation method of the amino-functionalized boron nitride nanosheets includes the following steps: Add 2,5-diaminobenzenesulfonic acid into deionized water, stir evenly, add hydroxylated boron nitride nanosheets, perform ultrasonic treatment at room temperature for 30 - 45 min, stir for 1 - 1.5 h, centrifuge after cooling, collect the precipitate, and freeze-dry to obtain the amino-functionalized boron nitride nanosheets; During the preparation process of the amino-functionalized boron nitride nanosheets, the mass ratio of 2,5-diaminobenzenesulfonic acid:hydroxylated boron nitride nanosheets is (0.1 - 0.2):(0.2 - 0.4).

6. The processing technology of an anti-wear and durable fastener according to claim 1, characterized in that: The preparation method of the corrosion inhibitor includes the following steps: Add 1-(3-aminopropyl)imidazole into acetonitrile, stir evenly, add the acetonitrile solution of n-butyl isocyanate, stir evenly, add bromohexadecane, stir and reflux for 4 - 4.5 h, add the product into ethyl acetate for precipitation, filter, and vacuum-dry to obtain the corrosion inhibitor.

7. The processing technology of an anti-wear and durable fastener according to claim 6, characterized in that: During the preparation of the corrosion inhibitor, the molar ratio of 1-(3-aminopropyl)imidazole: n-butyl isocyanate: cetyl bromide is 0.1:0.12:0.

15.

8. The processing technology of an anti-wear and durable fastener according to claim 1, characterized in that: The preparation method of the anti-aging repair aid includes the following steps: Under a nitrogen atmosphere, add n-butyl mercaptan to a reaction vessel, add sodium hydride under stirring, react for 1 - 1.5 h, add N-methylpyrrolidone and UV327 ultraviolet absorber, heat to 186 - 187 °C and reflux for 18 - 20 h, cool to room temperature, add deionized water and concentrated hydrochloric acid under stirring, cool in an ice bath, filter, collect the precipitate, wash the precipitate with petroleum ether, and dry it under vacuum to obtain the anti-aging repair aid.

9. The processing technology of an anti-wear and durable fastener according to claim 8, characterized in that: During the preparation of the anti-aging repair aid, the molar ratio of n-butyl mercaptan: sodium hydride: UV327 ultraviolet absorber is 0.08:0.096:0.

02.

10. An anti-wear and durable fastener prepared by the processing technology of an anti-wear and durable fastener according to any one of claims 1 - 9.