Lubricating wear-resistant coating for railway switch sliding plate and preparation process of lubricating wear-resistant coating

Abstract

The invention belongs to the technical field of solid lubrication, and discloses a lubricating wear-resistant coating for a railway switch sliding plate and a preparation process of the lubricating wear-resistant coating. The lubricating and wear-resistant coating for the railway switch sliding plate is prepared from the following raw materials in parts by weight: 20-30 parts of a polymer adhesive, 10-20 parts of a lubricant, 8-21 parts of a wear-resistant agent, 0.2-0.5 part of a hardening agent, 0.5-0.8 part of an auxiliary agent and 40-50 parts of an organic solvent. By adopting the coating formula, the wear-resistant lubricating coating is obtained by stirring, dispersing, grinding and filtering the raw materials. The lubricating wear-resistant coating disclosed by the invention can obviously reduce the friction force between the sliding plates of the switch, increases the wear resistance between the sliding plates, not only solves the cleaning problem of the sliding plates and reduces the labor intensity, but also solves the rust-proof and corrosion-proof problems of the sliding plates.

Description

Technical Field

[0001] The invention belongs to the technical field of solid lubrication, and relates to a lubricant specially used for railway switch slides, in particular to a lubricating and wear-resistant coating for railway switch slides and a preparation process thereof. Background Art

[0002] Railways are a major form of transportation, serving as a vital national infrastructure and a popular means of transportation. There are 5,594 railway stations in China, including 50 special-class stations, 236 first-class stations, 353 second-class stations, 939 third-class stations, and 3,966 other types. The average number of switch assemblies per station is 100, 80, 60, 50, and 10, respectively. Each set requires 16 to 32 slides, meaning 3 to 5 million slides are currently in use daily. Taking into account inventory and turnover, this represents a significant number.

[0003] Currently, almost all railway switch slides are lubricated using traditional methods, such as adding lubricating oil or applying grease. Auxiliary switch slides have an automatic detection system. If the reading falls below the specified value, maintenance workers are required to apply grease on the track. This requires frequent re-applying grease, which is highly unsafe and labor-intensive. Furthermore, grease easily absorbs dust and sand during use, forming sludge over time, reducing lubrication performance and even increasing the coefficient of friction, hindering the normal operation of the slide.

[0004] In addition, the public document "Preparation and Friction Performance Research of MoS2 Coating on 15-5PH Stainless Steel Surface, Zhang Xiangfeng, China Dissertation Database, 2022" is based on a certain type of helicopter bushing material (15-5PH stainless steel), using molybdenum disulfide (MoS2) as the main component of the self-lubricating layer, and applying the spraying method to prepare the coating.

[0005] The public document "Study on the Tribological Properties of Molybdenum Disulfide Composite Solid Lubricating Coating on Spherical Joint Bearings, Li Zhengguo, Qiu Ming, etc., China Academic Conference Paper Database, 2013" adopts the bonding solid lubricating coating method, with molybdenum disulfide and graphite as solid lubricants and inorganic phosphate as adhesive, and uses spraying to prepare a bonding solid lubricating coating on the outer surface of the inner ring of the spherical joint bearing.

[0006] The open document "Structural, surface and mechanical characterization of spray-deposited molybdenum disulfide thin films, AU: AbinayaA, Jeyaprakash BG SO: Materials Science in Semiconductor Processing, 2015, 31: 582-587" uses spray pyrolysis technology to deposit molybdenum disulfide (MoS2) with precursor salts of ammonium molybdate tetrahydrate and thiourea on a glass substrate at different precursor solution volumes (10-50 mL).

[0007] Public patent CN202111492186.3 provides a carbon / molybdenum disulfide composite lubricant and its preparation method and application. The invention uses a one-step method to synthesize a two-component lubricant, which is simple, reliable and highly operational. The resulting composite coating has a low friction coefficient and high wear resistance, and effectively extends the service life of the metal substrate and saves energy.

[0008] Public patent CN202010333790.0 relates to a high-load-resistant molybdenum disulfide dry film lubricant for bushings, which is made of the following raw materials in parts by weight: 88-90 parts of phenolic epoxy resin, 28-31 parts of polyamideimide resin, 25-28 parts of molybdenum disulfide, 4-6 parts of tributyl citrate, 7-9 parts of amino carbon nanotubes, 5-7 parts of antimony oxide, 2.5-3.5 parts of tantalum powder, 0.8-1.0 parts of vinyltriethoxysilane and 60-62 parts of a mixed solvent, wherein the mixed solvent is a mixture of ethylene glycol ethyl ether, xylene and acetone in a mass percentage of 1:5:4.

[0009] Patent publication CN201710710667.4 relates to a self-lubricating, wear-resistant molybdenum disulfide composite coating and its preparation method. The coating comprises molybdenum disulfide (MoS2) and doping materials such as antimony (Sb) and yttrium (Y). The molar content of the Y element in the composite coating is 0.1-2%, and the molar content of the Sb element is 0.5-5%. The coating has a uniform and dense structure, significantly improving the friction and wear life of the coating while reducing the corrosiveness of reaction byproducts to equipment.

[0010] Patent publication JP2004227685 discloses powder spraying of molybdenum disulfide as a lubricant and a method for using the same, wherein a MoS layer is formed on a sliding surface by high-pressure spraying of MoS powder.

[0011] While the aforementioned existing literature discloses that using molybdenum disulfide as a lubricant can meet basic requirements, these existing lubricating coatings generally suffer from poor adhesion and wear resistance when used as coatings for railway switch slides. This makes them unable to meet the requirements of heavy loads, high-frequency impacts, and high-friction operation of railway switch slides. Therefore, the adhesion and wear resistance of lubricating coatings used for railway switch slides need to be further improved. Summary of the Invention

[0012] In order to solve the above problems existing in the existing switch slide grease lubrication method, the present invention proposes a railway switch slide lubricating and wear-resistant coating and its preparation process, which can effectively reduce the friction of the switch slide and increase the wear resistance of the slide.

[0013] The present invention sets technical specifications and designs a component formula based on the operating requirements of the switch slide. Through repeated testing and data optimization, the coating formula is determined. The raw materials are then stirred, dispersed, ground, and filtered to produce a wear-resistant, lubricating coating ready for use.

[0014] To achieve the above object, the present invention adopts the following technical solutions:

[0015] The first aspect of the present invention is to provide a lubricating and wear-resistant coating for a railway switch slide, which is prepared from the following raw materials in parts by weight: 45-55 parts of a polymer adhesive, 15-25 parts of a lubricant, 8-21 parts of a wear-resistant agent, 0.2-0.5 parts of a hardener, 0.5-0.8 parts of an additive, and 10-25 parts of an organic solvent;

[0016] Wherein, the polymer adhesive is selected from one or both of epoxy-modified polyamide resin and epoxy-modified polyimide resin;

[0017] The lubricant is selected from one or more of molybdenum disulfide, tungsten disulfide, graphite, Teflon, and iron oxide.

[0018] Preferably, the polymer adhesive contains 15 to 20 parts of epoxy-modified polyamide resin and 30 to 35 parts of epoxy-modified polyimide resin.

[0019] Preferably, the lubricant contains 8 to 12 parts of molybdenum disulfide, 4 to 6 parts of tungsten disulfide, 0.5 to 1.5 parts of graphite, 2 to 4 parts of Teflon, and 0.5 to 1.5 parts of iron oxide.

[0020] Preferably, the wear-resistant agent is selected from one or more of silicon nitride, silicon carbide and silicon dioxide.

[0021] More preferably, the wear-resistant agent contains 5 to 12 parts of silicon nitride, 2 to 6 parts of silicon carbide, and 1 to 3 parts of silicon dioxide.

[0022] Preferably, the hardener is graphene powder with an average particle size of 7 to 12 μm.

[0023] Preferably, the auxiliary agent is one or more of a dispersant, a film-forming agent, an anti-skinning agent, a rheological agent, and a leveling agent.

[0024] More preferably, the additives include 0.3 to 0.5 parts of BYK 2013 dispersant, 0.1 to 0.15 parts of BYK 331 leveling agent, and 0.1 to 0.15 parts of BYK-420 rheological agent.

[0025] Preferably, the organic solvent is selected from one or more of xylene, cyclohexanone, ethanol, ethyl ester, and NN-dimethylacetamide.

[0026] More preferably, the organic solvent contains 5 to 12 parts of xylene, 2 to 6 parts of cyclohexanone, and 3 to 10 parts of NN-dimethylacetamide.

[0027] The second aspect of the present invention is to provide a preparation process of the lubricating and wear-resistant coating for the railway switch slide, comprising the following steps:

[0028] (1) Organic solvent mixing: Add xylene, cyclohexanone and NN-dimethylacetamide into the dispersion tank in proportion, with an interval of 3 minutes between each addition. Stir for 15 minutes after adding the materials at a speed of 50 rpm;

[0029] (2) Adding additives: Add BYK 2013 dispersant, BYK 331 leveling agent and BYK-420 rheological agent to the dispersion tank in proportion, with an interval of 5 minutes between each addition. Stir for 20 minutes after adding the materials at a speed of 80 rpm;

[0030] (3) Adding polymer adhesive: Add epoxy modified polyamide resin in proportion, stir at 60 rpm for 30 minutes, then add epoxy modified polyimide resin in corresponding proportion, stir at 60 rpm for 30 minutes;

[0031] (4) Adding powder: Add lubricant, anti-wear agent and hardener to the dispersion tank in proportion and stir and disperse them. The interval between two additions is 5 minutes, and the speed is 60 rpm;

[0032] (5) Coating grinding: Add the above-obtained liquid into a horizontal grinder and grind it 2 to 5 times at a grinding speed of 3000 rpm and a liquid temperature of less than 40°C;

[0033] (6) Paint filtration: The ground material liquid is filtered by high-speed rotating centrifugal filter. The paint viscosity is tested to be 40±5S (Zai En No. 2 cup), and the average fineness of the paint is tested to be 10±2 microns.

[0034] The present invention prepares a molybdenum disulfide lubricating and wear-resistant coating by physically mixing, stirring, dispersing and grinding molybdenum disulfide powder, silicon carbide powder, an auxiliary agent, a solvent and a polymer modified epoxy resin. The obtained molybdenum disulfide lubricating and wear-resistant coating is sprayed onto the surface of a railway switch slide, and a firm, dense lubricating and wear-resistant coating is formed on the surface by heat curing, which plays a role of self-lubrication and wear resistance, replacing the traditional grease method. After a period of use, the coating will be worn or damaged, and can be repaired by spraying a molybdenum disulfide lubricating spray. The sprayed molybdenum disulfide lubricating spray can be prepared by diluting the railway switch slide lubricating and wear-resistant coating, filling it and adding a propellant, or by using a special molybdenum disulfide lubricating repair spray.

[0035] The present invention adopts the above technical solution, which has the following technical effects compared with the prior art:

[0036] (1) Improve the coefficient between the slides: Applying a layer of molybdenum disulfide lubricating and wear-resistant coating on the surface of the slide can effectively solve the friction or jitter problem between the slides, greatly reducing the friction coefficient, reducing noise, and increasing smoothness and anti-jamming properties;

[0037] (2) Increased wear resistance between the slides: By adding wear-resistant additives to the coating, the surface hardness of the coating is increased, thereby enhancing the wear resistance between the slides, and as a result, extending the service life of the switch assembly;

[0038] (3) Solve the cleaning problem of the slide: the traditional lubrication method of the switch slide is semi-fluid or fluid lubrication, that is, lubricating oil or grease is applied. When used in the field, it is easy to absorb dust and sand to form sludge, which not only loses the lubricating properties but also increases the friction coefficient. It is also untidy and unsightly. The application of dry film lubrication will not cause the above problems.

[0039] (4) Easy maintenance and reduced labor intensity: After the railway switch is lubricated with dry film, the film layer will exist between the slides for a long time. Once it is worn in the later stage, it can be repaired by spraying molybdenum disulfide lubricant spray, and the wear resistance and self-lubricating properties are not affected. It is convenient for the maintenance of the switch equipment, and there is no need to work as frequently as applying grease, which greatly reduces the labor intensity of maintenance workers.

[0040] (5) Solve the problem of rust and corrosion prevention of skateboards: Molybdenum disulfide lubricating coating forms a dense and firm lubricating film on the surface of the skateboard with a thickness of about 25 microns; the film layer isolates the contact between the metal substrate and the air, making it difficult for the substrate to rust, and achieving better rust and corrosion prevention effects.

[0041] (6) Long service life: The lubricating and wear-resistant coating of the railway switch slide is used as the switch slide coating. Compared with other processes, in addition to the commonalities, it mainly solves the adverse factors of overload, high-frequency collision and multiple friction during the operation of the switch, greatly improving the service life of the switch slide and reducing the equipment maintenance cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 The following is a product sample photo of a tinplate plate product on which the lubricating and wear-resistant coating according to Example 1 of the present invention is sprayed and cured.

[0043] Figure 2 The following are inspection photos of a switch buckle product that has been sprayed and cured with the lubricating and wear-resistant coating of Example 6 of the present invention. DETAILED DESCRIPTION

[0044] The present invention will be described in detail and specifically below through specific examples to provide a better understanding of the present invention, but the following examples do not limit the scope of the present invention.

[0045] Example 1

[0046] A lubricating and wear-resistant coating for railway switch slides is prepared from six components: a polymer adhesive, a lubricant, a wear-resistant agent, a hardening agent, an additive, and an organic solvent. The raw material selection and dosage of each component are shown in Table 1 below.

[0047] Table 1 Selection and dosage of raw materials in Example 1

[0048]

[0049]

[0050] According to the component formula in Table 1 above, the preparation process of the lubricating and wear-resistant coating for railway switch slide includes the following steps:

[0051] (1) Organic solvent mixing: Add 10 kg of xylene, 3 kg of cyclohexanone and 3 kg of NN-dimethylacetamide into the dispersion barrel in sequence, with an interval of 3 minutes between each addition. Stir for 15 minutes after adding the materials at a speed of 50 rpm. The stirring and dispersion barrel and the stirrer must be grounded to prevent static sparks.

[0052] (2) Adding additives: Add 0.35 kg of BYK 2013 dispersant, 0.1 kg of BYK 331 leveling agent and 0.12 kg of BYK-420 rheological agent to the dispersion tank in sequence, with an interval of 5 minutes between each addition. Stir for 20 minutes after adding the materials at a speed of 80 rpm.

[0053] (3) Adding polymer adhesive: First, add 15 kg of epoxy modified polyamide resin to the above dispersion barrel, disperse and stir at 60 rpm for 30 minutes, then add 35 kg of epoxy modified polyimide resin, disperse and stir at 60 rpm for 30 minutes.

[0054] (4) Adding powder: Add lubricant, anti-wear agent and hardening agent to the dispersion barrel in proportion and stir and disperse them. The interval between two additions is 5 minutes, and the rotation speed is 60 rpm; the lubricant is pre-mixed with 10 kg of molybdenum disulfide, 4 kg of tungsten disulfide, 1 kg of graphite, 2 kg of Teflon and 1 kg of iron oxide; the anti-wear agent is pre-mixed with 6 kg of silicon nitride, 2 kg of silicon carbide and 2 kg of silicon dioxide; the hardening agent is 0.2 kg of graphene powder.

[0055] (5) Coating grinding: Add the above-obtained liquid into a horizontal grinder and grind for 2 to 5 times at a grinding speed of 3000 rpm and a liquid temperature of less than 40°C.

[0056] (6) Paint Filtration: The ground material liquid is filtered through a high-speed centrifugal filter to obtain a gray liquid. The paint viscosity is tested to be 40±5S (Zai En No. 2 cup) and the average paint fineness is tested to be 10±2 microns, which means the paint is qualified. If the paint viscosity is high, add diluent to dilute it and retest the viscosity and fineness.

[0057] (7) Product packaging: The qualified coatings are packed into 1kg or 5kg packaging bottles for use or sale.

[0058] Example 2

[0059] A lubricating and wear-resistant coating for railway switch slides is prepared from six components: a polymer adhesive, a lubricant, a wear-resistant agent, a hardening agent, an additive, and an organic solvent. The raw material selection and dosage of each component are shown in Table 2 below.

[0060] Table 2 Raw material selection and dosage of Example 2

[0061]

[0062] According to the component formula in Table 2 above, the preparation process of the lubricating and wear-resistant coating for railway switch slide includes the following steps:

[0063] (1) Organic solvent mixing: Add 10 kg of xylene, 3 kg of cyclohexanone and 3 kg of NN-dimethylacetamide into the dispersion barrel in sequence, with an interval of 3 minutes between each addition. Stir for 15 minutes after adding the materials at a speed of 50 rpm. The stirring and dispersion barrel and the stirrer must be grounded to prevent static sparks.

[0064] (2) Adding additives: Add 0.35 kg of BYK 2013 dispersant, 0.1 kg of BYK 331 leveling agent and 0.12 kg of BYK-420 rheological agent to the dispersion tank in sequence, with an interval of 5 minutes between each addition. Stir for 20 minutes after adding the materials at a speed of 80 rpm.

[0065] (3) Adding polymer adhesive: First, add 18 kg of epoxy modified polyamide resin to the above dispersion barrel, disperse and stir at 60 rpm for 30 minutes, then add 32 kg of epoxy modified polyimide resin, disperse and stir at 60 rpm for 30 minutes.

[0066] (4) Adding powder: Add lubricant, anti-wear agent and hardening agent to the dispersion barrel in proportion and stir and disperse them. The interval between two additions is 5 minutes, and the rotation speed is 60 rpm; the lubricant is pre-mixed with 8 kg of molybdenum disulfide, 6 kg of tungsten disulfide, 1 kg of graphite, 2 kg of Teflon and 1 kg of iron oxide; the anti-wear agent is pre-mixed with 10 kg of silicon nitride, 3 kg of silicon carbide and 3 kg of silicon dioxide; the hardening agent is 0.4 kg of graphene powder.

[0067] (5) Coating grinding: Add the above-obtained liquid into a horizontal grinder and grind for 2 to 5 times at a grinding speed of 3000 rpm and a liquid temperature of less than 40°C.

[0068] (6) Paint Filtration: The ground material liquid is filtered through a high-speed centrifugal filter to obtain a gray liquid. The paint viscosity is tested to be 40±5S (Zai En No. 2 cup) and the average paint fineness is tested to be 10±2 microns, which means the paint is qualified. If the paint viscosity is high, add diluent to dilute it and retest the viscosity and fineness.

[0069] (7) Product packaging: The qualified coatings are packed into 1kg or 5kg packaging bottles for use or sale.

[0070] Example 3

[0071] A lubricating and wear-resistant coating for railway switch slides is prepared from six components: a polymer adhesive, a lubricant, a wear-resistant agent, a hardening agent, an additive, and an organic solvent. The raw material selection and dosage of each component are shown in Table 3 below.

[0072] Table 3 Raw material selection and dosage of Example 3

[0073]

[0074]

[0075] According to the component formula in Table 3 above, the preparation process of the lubricating and wear-resistant coating for railway switch slide includes the following steps:

[0076] (1) Organic solvent mixing: Add 10 kg of xylene, 3 kg of cyclohexanone and 3 kg of NN-dimethylacetamide into the dispersion barrel in sequence, with an interval of 3 minutes between each addition. Stir for 15 minutes after adding the materials at a speed of 50 rpm. The stirring and dispersion barrel and the stirrer must be grounded to prevent static sparks.

[0077] (2) Adding additives: Add 0.35 kg of BYK 2013 dispersant, 0.1 kg of BYK 331 leveling agent and 0.12 kg of BYK-420 rheological agent to the dispersion tank in sequence, with an interval of 5 minutes between each addition. Stir for 20 minutes after adding the materials at a speed of 80 rpm.

[0078] (3) Adding polymer adhesive: First, add 15 kg of epoxy modified polyamide resin to the above dispersion barrel, disperse and stir at 60 rpm for 30 minutes, then add 30 kg of epoxy modified polyimide resin, disperse and stir at 60 rpm for 30 minutes.

[0079] (4) Adding powder: Add lubricant, anti-wear agent and hardening agent to the dispersion barrel in proportion and stir and disperse them. The interval between two additions is 5 minutes, and the rotation speed is 60 rpm; the lubricant is pre-mixed with 9 kg of molybdenum disulfide, 5 kg of tungsten disulfide, 1 kg of graphite, 3 kg of Teflon and 1 kg of iron oxide; the anti-wear agent is pre-mixed with 6 kg of silicon nitride, 5 kg of silicon carbide and 2 kg of silicon dioxide; the hardening agent is 0.4 kg of graphene powder.

[0080] (5) Coating grinding: Add the above-obtained liquid into a horizontal grinder and grind for 2 to 5 times at a grinding speed of 3000 rpm and a liquid temperature of less than 40°C.

[0081] (6) Paint Filtration: The ground material liquid is filtered through a high-speed centrifugal filter to obtain a gray liquid. The paint viscosity is tested to be 40±5S (Zai En No. 2 cup) and the average paint fineness is tested to be 10±2 microns, which means the paint is qualified. If the paint viscosity is high, add diluent to dilute it and retest the viscosity and fineness.

[0082] (7) Product packaging: The qualified coatings are packed into 1kg or 5kg packaging bottles for use or sale.

[0083] Example 4

[0084] A lubricating and wear-resistant coating for railway switch slides is prepared from six components: a polymer adhesive, a lubricant, a wear-resistant agent, a hardening agent, an additive, and an organic solvent. The raw material selection and dosage of each component are shown in Table 4 below.

[0085] Table 4 Example 4 Raw material selection and dosage

[0086]

[0087] According to the component formula in Table 4 above, the preparation process of the railway switch slide plate lubricating and wear-resistant coating includes the following steps:

[0088] (1) Organic solvent mixing: Add 10 kg of xylene, 3 kg of cyclohexanone and 3 kg of NN-dimethylacetamide into the dispersion barrel in sequence, with an interval of 3 minutes between each addition. Stir for 15 minutes after adding the materials at a speed of 50 rpm. The stirring and dispersion barrel and the stirrer must be grounded to prevent static sparks.

[0089] (2) Adding additives: Add 0.35 kg of BYK 2013 dispersant, 0.1 kg of BYK 331 leveling agent and 0.12 kg of BYK-420 rheological agent to the dispersion tank in sequence, with an interval of 5 minutes between each addition. Stir for 20 minutes after adding the materials at a speed of 80 rpm.

[0090] (3) Adding polymer adhesive: First, add 20 kg of epoxy modified polyamide resin to the above dispersion barrel, disperse and stir at 60 rpm for 30 minutes, then add 35 kg of epoxy modified polyimide resin, disperse and stir at 60 rpm for 30 minutes.

[0091] (4) Adding powder: Add lubricant, anti-wear agent and hardening agent to the dispersion barrel in proportion and stir and disperse them. The interval between two additions is 5 minutes, and the rotation speed is 60 rpm; the lubricant is pre-mixed with 8 kg of molybdenum disulfide, 6 kg of tungsten disulfide, 1.5 kg of graphite, 3 kg of Teflon and 1.5 kg of iron oxide; the anti-wear agent is pre-mixed with 10 kg of silicon nitride, 4 kg of silicon carbide and 2 kg of silicon dioxide; the hardening agent is 0.4 kg of graphene powder.

[0092] (5) Coating grinding: Add the above-obtained liquid into a horizontal grinder and grind for 2 to 5 times at a grinding speed of 3000 rpm and a liquid temperature of less than 40°C.

[0093] (6) Paint Filtration: The ground material liquid is filtered through a high-speed centrifugal filter to obtain a gray liquid. The paint viscosity is tested to be 40±5S (Zai En No. 2 cup) and the average paint fineness is tested to be 10±2 microns, which means the paint is qualified. If the paint viscosity is high, add diluent to dilute it and retest the viscosity and fineness.

[0094] (7) Product packaging: The qualified coatings are packed into 1kg or 5kg packaging bottles for use or sale.

[0095] Example 5

[0096] A lubricating and wear-resistant coating for railway switch slides is prepared from six components: a polymer adhesive, a lubricant, a wear-resistant agent, a hardening agent, an additive, and an organic solvent. The raw material selection and dosage of each component are shown in Table 5 below.

[0097] Table 5 Raw material selection and dosage of Example 5

[0098]

[0099] According to the component formula in Table 5 above, the preparation process of the lubricating and wear-resistant coating for railway switch slide includes the following steps:

[0100] (1) Organic solvent mixing: Add 10 kg of xylene, 3 kg of cyclohexanone and 3 kg of NN-dimethylacetamide into the dispersion barrel in sequence, with an interval of 3 minutes between each addition. Stir for 15 minutes after adding the materials at a speed of 50 rpm. The stirring and dispersion barrel and the stirrer must be grounded to prevent static sparks.

[0101] (2) Adding additives: Add 0.35 kg of BYK 2013 dispersant, 0.1 kg of BYK 331 leveling agent and 0.12 kg of BYK-420 rheological agent to the dispersion tank in sequence, with an interval of 5 minutes between each addition. Stir for 20 minutes after adding the materials at a speed of 80 rpm.

[0102] (3) Adding polymer adhesive: First, add 15 kg of epoxy modified polyamide resin to the above dispersion barrel, disperse and stir at 60 rpm for 30 minutes, then add 35 kg of epoxy modified polyimide resin, disperse and stir at 60 rpm for 30 minutes.

[0103] (4) Adding powder: Add lubricant, anti-wear agent and hardening agent to the dispersion barrel in proportion and stir and disperse them. The interval between two additions is 5 minutes, and the rotation speed is 60 rpm; the lubricant is pre-mixed with 12 kg of molybdenum disulfide, 4 kg of tungsten disulfide, 0.5 kg of graphite, 3 kg of Teflon and 1 kg of iron oxide; the anti-wear agent is pre-mixed with 10 kg of silicon nitride, 4 kg of silicon carbide and 3 kg of silicon dioxide; the hardening agent is 0.2 kg of graphene powder.

[0104] (5) Coating grinding: Add the above-obtained liquid into a horizontal grinder and grind for 2 to 5 times at a grinding speed of 3000 rpm and a liquid temperature of less than 40°C.

[0105] (6) Paint Filtration: The ground material liquid is filtered through a high-speed centrifugal filter to obtain a gray liquid. The paint viscosity is tested to be 40±5S (Zai En No. 2 cup) and the average paint fineness is tested to be 10±2 microns, which means the paint is qualified. If the paint viscosity is high, add diluent to dilute it and retest the viscosity and fineness.

[0106] (7) Product packaging: The qualified coatings are packed into 1kg or 5kg packaging bottles for use or sale.

[0107] Example 6

[0108] A lubricating and wear-resistant coating for railway switch slides is prepared from six components: a polymer adhesive, a lubricant, a wear-resistant agent, a hardening agent, an additive, and an organic solvent. The raw material selection and dosage of each component are shown in Table 6 below.

[0109] Table 6 Raw material selection and dosage of Example 6

[0110]

[0111]

[0112] According to the component formula in Table 6 above, the preparation process of the lubricating and wear-resistant coating for railway switch slide includes the following steps:

[0113] (1) Organic solvent mixing: Add 10 kg of xylene, 3 kg of cyclohexanone and 3 kg of NN-dimethylacetamide into the dispersion barrel in sequence, with an interval of 3 minutes between each addition. Stir for 15 minutes after adding the materials at a speed of 50 rpm. The stirring and dispersion barrel and the stirrer must be grounded to prevent static sparks.

[0114] (2) Adding additives: Add 0.35 kg of BYK 2013 dispersant, 0.1 kg of BYK 331 leveling agent and 0.12 kg of BYK-420 rheological agent to the dispersion tank in sequence, with an interval of 5 minutes between each addition. Stir for 20 minutes after adding the materials at a speed of 80 rpm.

[0115] (3) Adding polymer adhesive: First, add 15 kg of epoxy modified polyamide resin to the above dispersion barrel, disperse and stir at 60 rpm for 30 minutes, then add 30 kg of epoxy modified polyimide resin, disperse and stir at 60 rpm for 30 minutes.

[0116] (4) Adding powder: Add lubricant, anti-wear agent and hardening agent to the dispersion barrel in proportion and stir and disperse them. The interval between two additions is 5 minutes, and the rotation speed is 60 rpm; the lubricant is pre-mixed with 12 kg of molybdenum disulfide, 4 kg of tungsten disulfide, 0.5 kg of graphite, 3 kg of Teflon and 1 kg of iron oxide; the anti-wear agent is pre-mixed with 10 kg of silicon nitride, 4 kg of silicon carbide and 3 kg of silicon dioxide; the hardening agent is 0.2 kg of graphene powder.

[0117] (5) Coating grinding: Add the above-obtained liquid into a horizontal grinder and grind for 2 to 5 times at a grinding speed of 3000 rpm and a liquid temperature of less than 40°C.

[0118] (6) Paint Filtration: The ground material liquid is filtered through a high-speed centrifugal filter to obtain a gray liquid. The paint viscosity is tested to be 40±5S (Zai En No. 2 cup) and the average paint fineness is tested to be 10±2 microns, which means the paint is qualified. If the paint viscosity is high, add diluent to dilute it and retest the viscosity and fineness.

[0119] (7) Product packaging: The qualified coatings are packed into 1kg or 5kg packaging bottles for use or sale.

[0120] Comparative Example 1

[0121] A lubricating and wear-resistant coating for railway switch slides is prepared from six components: a polymer adhesive, a lubricant, a wear-resistant agent, a hardening agent, an additive, and an organic solvent. The raw material selection and dosage of each component are shown in Table 7 below.

[0122] Table 7 Comparative Example 1 Raw material selection and dosage

[0123]

[0124] According to the component formula in Table 7 above, the preparation process of the lubricating and wear-resistant coating for railway switch slide includes the following steps:

[0125] (1) Organic solvent mixing: Add 10 kg of xylene, 3 kg of cyclohexanone and 3 kg of NN-dimethylacetamide into the dispersion barrel in sequence, with an interval of 3 minutes between each addition. Stir for 15 minutes after adding the materials at a speed of 50 rpm. The stirring and dispersion barrel and the stirrer must be grounded to prevent static sparks.

[0126] (2) Adding additives: Add 0.35 kg of BYK 2013 dispersant, 0.1 kg of BYK 331 leveling agent and 0.12 kg of BYK-420 rheological agent to the dispersion tank in sequence, with an interval of 5 minutes between each addition. Stir for 20 minutes after adding the materials at a speed of 80 rpm.

[0127] (3) Adding polymer adhesive: First, add 10 kg of epoxy modified polyamide resin to the above dispersion barrel, disperse and stir at 60 rpm for 30 minutes, then add 42 kg of epoxy modified polyimide resin, disperse and stir at 60 rpm for 30 minutes.

[0128] (4) Adding powder: Add lubricant, anti-wear agent and hardening agent to the dispersion barrel in proportion and stir and disperse them. The interval between two additions is 5 minutes, and the rotation speed is 60 rpm; the lubricant is pre-mixed with 6 kg of molybdenum disulfide, 8 kg of tungsten disulfide, 3 kg of graphite, 1 kg of Teflon and 2 kg of iron oxide; the anti-wear agent is pre-mixed with 6 kg of silicon nitride, 2 kg of silicon carbide and 2 kg of silicon dioxide; the hardening agent is 0.2 kg of graphene powder.

[0129] (5) Coating grinding: Add the above-obtained liquid into a horizontal grinder and grind for 2 to 5 times at a grinding speed of 3000 rpm and a liquid temperature of less than 40°C.

[0130] (6) Paint Filtration: The ground material liquid is filtered through a high-speed centrifugal filter to obtain a gray liquid. The paint viscosity is tested to be 40±5S (Zai En No. 2 cup) and the average paint fineness is tested to be 10±2 microns, which means the paint is qualified. If the paint viscosity is high, add diluent to dilute it and retest the viscosity and fineness.

[0131] (7) Product packaging: The qualified coatings are packed into 1kg or 5kg packaging bottles for use or sale.

[0132] Comparative Example 2

[0133] A lubricating and wear-resistant coating for railway switch slides is prepared from six components: a polymer adhesive, a lubricant, a wear-resistant agent, a hardening agent, an additive, and an organic solvent. The raw material selection and dosage of each component are shown in Table 8 below.

[0134] Table 8 Comparative Example 2 Raw Material Selection and Dosage

[0135]

[0136]

[0137] According to the component formula in Table 8 above, the preparation process of the lubricating and wear-resistant coating for railway switch slide includes the following steps:

[0138] (1) Organic solvent mixing: Add 10 kg of xylene, 3 kg of cyclohexanone and 3 kg of NN-dimethylacetamide into the dispersion barrel in sequence, with an interval of 3 minutes between each addition. Stir for 15 minutes after adding the materials at a speed of 50 rpm. The stirring and dispersion barrel and the stirrer must be grounded to prevent static sparks.

[0139] (2) Adding additives: Add 0.35 kg of BYK 2013 dispersant, 0.1 kg of BYK 331 leveling agent and 0.12 kg of BYK-420 rheological agent to the dispersion tank in sequence, with an interval of 5 minutes between each addition. Stir for 20 minutes after adding the materials at a speed of 80 rpm.

[0140] (3) Adding polymer adhesive: First, add 35 kg of epoxy modified polyamide resin to the above dispersion barrel, disperse and stir at 60 rpm for 30 minutes, then add 20 kg of epoxy modified polyimide resin, disperse and stir at 60 rpm for 30 minutes.

[0141] (4) Adding powder: Add lubricant, anti-wear agent and hardening agent to the dispersion barrel in proportion and stir and disperse them. The interval between two additions is 5 minutes, and the rotation speed is 60 rpm; the lubricant is pre-mixed with 6 kg of molybdenum disulfide, 8 kg of tungsten disulfide, 3 kg of graphite, 1 kg of Teflon and 2 kg of iron oxide; the anti-wear agent is pre-mixed with 6 kg of silicon nitride, 5 kg of silicon carbide and 2 kg of silicon dioxide; the hardening agent is 0.4 kg of graphene powder.

[0142] (5) Coating grinding: Add the above-obtained liquid into a horizontal grinder and grind for 2 to 5 times at a grinding speed of 3000 rpm and a liquid temperature of less than 40°C.

[0143] (6) Paint Filtration: The ground material liquid is filtered through a high-speed centrifugal filter to obtain a gray liquid. The paint viscosity is tested to be 40±5S (Zai En No. 2 cup) and the average paint fineness is tested to be 10±2 microns, which means the paint is qualified. If the paint viscosity is high, add diluent to dilute it and retest the viscosity and fineness.

[0144] (7) Product packaging: The qualified coatings are packed into 1kg or 5kg packaging bottles for use or sale.

[0145] (5) Coating grinding: Add the above-obtained liquid into a horizontal grinder and grind it 2 to 5 times at a grinding speed of 3000 rpm and a liquid temperature of less than 40°C;

[0146] (6) Paint Filtration: The ground material liquid is filtered through a high-speed centrifugal filter to obtain a gray liquid. The paint viscosity is tested to be 40±5S (Zai En No. 2 cup) and the average paint fineness is tested to be 10±2 microns, which means the paint is qualified. If the paint viscosity is high, add diluent to dilute it and retest the viscosity and fineness.

[0147] (7) Product packaging: The qualified coatings are packed into 1kg or 5kg packaging bottles for use or sale.

[0148] Comparative Example 3

[0149] A lubricating and wear-resistant coating for railway switch slides is prepared from six components: a polymer adhesive, a lubricant, a wear-resistant agent, a hardening agent, an additive, and an organic solvent. The raw material selection and dosage of each component are shown in Table 9 below.

[0150] Table 9 Comparative Example 3 Raw material selection and dosage

[0151]

[0152] According to the component formula in Table 9 above, the preparation process of the lubricating and wear-resistant coating for railway switch slide includes the following steps:

[0153] (1) Organic solvent mixing: Add 10 kg of xylene, 3 kg of cyclohexanone and 3 kg of NN-dimethylacetamide into the dispersion barrel in sequence, with an interval of 3 minutes between each addition. Stir for 15 minutes after adding the materials at a speed of 50 rpm. The stirring and dispersion barrel and the stirrer must be grounded to prevent static sparks.

[0154] (2) Adding additives: Add 0.35 kg of BYK 2013 dispersant, 0.1 kg of BYK 331 leveling agent and 0.12 kg of BYK-420 rheological agent to the dispersion tank in sequence, with an interval of 5 minutes between each addition. Stir for 20 minutes after adding the materials at a speed of 80 rpm.

[0155] (3) Adding polymer adhesive: First, add 15 kg of epoxy modified polyamide resin to the above dispersion barrel, disperse and stir at 60 rpm for 30 minutes, then add 35 kg of epoxy modified polyimide resin, disperse and stir at 60 rpm for 30 minutes.

[0156] (4) Adding powder: Add lubricant, anti-wear agent and hardening agent to the dispersion barrel in proportion and stir and disperse them. The interval between two additions is 5 minutes, and the rotation speed is 60 rpm; the lubricant is pre-mixed with 6 kg of molybdenum disulfide, 8 kg of tungsten disulfide, 3 kg of graphite, 1 kg of Teflon and 2 kg of iron oxide; the anti-wear agent is pre-mixed with 3 kg of silicon nitride, 10 kg of silicon carbide and 5 kg of silicon dioxide; the hardening agent is 0.2 kg of graphene powder.

[0157] (5) Coating grinding: Add the above-obtained liquid into a horizontal grinder and grind for 2 to 5 times at a grinding speed of 3000 rpm and a liquid temperature of less than 40°C.

[0158] (6) Paint Filtration: The ground material liquid is filtered through a high-speed centrifugal filter to obtain a gray liquid. The paint viscosity is tested to be 40±5S (Zai En No. 2 cup) and the average paint fineness is tested to be 10±2 microns, which means the paint is qualified. If the paint viscosity is high, add diluent to dilute it and retest the viscosity and fineness.

[0159] (7) Product packaging: The qualified coatings are packed into 1kg or 5kg packaging bottles for use or sale.

[0160] Performance testing:

[0161] The wear-resistant coatings prepared in Examples 1-6 and Comparative Examples 1-3 were sprayed onto the surface of a switch slide (using tinplate as the substrate) and cured at 230°C for 30 minutes to a dry film thickness of 25 μm. Six test panels (W001-W006) and three control panels (D001-D003) were prepared and their performance was tested.

[0162] (1) Heat resistance and low temperature resistance test

[0163] Heat resistance: Place the test plate in a high-temperature furnace and heat it to 100°C and start timing. After 1 minute, turn off the high-temperature furnace and allow the test plate to cool to room temperature before taking it out for observation.

[0164] Low temperature resistance: (1) Place the test panel in a high and low temperature test chamber and cool it to -40°C. Start timing. After 1 minute, close the chamber and allow the test panel to warm to room temperature. Then remove and observe. (2) High and low temperature test chamber: Suzhou Hammerman Electronic Equipment Co., Ltd., Model: KTSB-715TBS, No.: TL-J-0573; Air flow rate: 0.2 m / s, Direction: bottom-up.

[0165] The test results are shown in Table 10 below.

[0166] Table 10 Temperature resistance test data of each test group and control group

[0167]

[0168]

[0169] Comparing the data in Table 10 above, we can see that the test group's maximum high-temperature resistance was 409°C and its minimum was 401°C, both meeting the design specifications. Its minimum low-temperature resistance was -45°C and its maximum was -40°C, both meeting the design specifications. The control group's maximum high-temperature resistance was 375°C and its minimum was 361°C. Its minimum low-temperature resistance was -36°C and its maximum was -27°C, both falling outside the design specification range.

[0170] (2) Adhesion and friction coefficient test

[0171] Adhesion and friction coefficient tests were performed on the six test panels (W001-W006) and three control panels (D001-D003). Adhesion tests were conducted using the GBT9286-1998 Metal Coating Adhesion Test Method (100-grid Test), and friction coefficient tests were conducted using the "Test Method and Evaluation Standard for Anti-Friction Performance of Coatings" (GB / T13376-2018). The test results are shown in Table 11 below.

[0172] Table 11 Adhesion and friction coefficient test data of each test group and control group

[0173] Serial number Adhesion Friction coefficient W001 Level 0 0.078 W002 Level 1 0.080 W003 Level 0 0.078 W004 Level 0 0.076 W005 Level 1 0.076 W006 Level 0 0.074 D001 Level 0 0.085 D002 Level 0 0.089 D003 Level 0 0.089

[0174] Comparing the data in Table 11, we can see that the adhesion of the test and control groups reached the standard value of levels 0 to 1, both meeting the design specifications. However, the friction coefficient of the test group, with a maximum value of 0.08 and a minimum value of 0.074, is less than or equal to 0.08 and within the design standard. The friction coefficient of the control group, with a maximum value of 0.089 and a minimum value of 0.085, exceeds the design specifications.

[0175] The high-temperature resistance and low-temperature resistance of the lubricating and wear-resistant coating of the present invention both meet the design indicators, and are more in line with the use requirements of the railway switch slide; and can effectively reduce the friction between the switch slides, increase the wear resistance between the slides, and solve the unfavorable factors of overload, high-frequency collision, and multiple friction during the operation of the switch, while solving the cleaning problem of the slide, reducing labor intensity, and taking into account the rust and corrosion prevention of the slide.

[0176] While the specific embodiments of the present invention have been described in detail above, these are merely exemplary and the present invention is not limited thereto. For those skilled in the art, any equivalent modifications and substitutions to the present invention are also within the scope of the present invention. Therefore, any equivalent changes and modifications made without departing from the spirit and scope of the present invention are intended to be encompassed within the scope of the present invention.

Claims

1. A lubricating and wear-resistant coating for railway switch slide, characterized in that: The preparation method is prepared by using the following raw materials in parts by weight: 45-55 parts of polymer adhesive, 15-25 parts of lubricant, 8-21 parts of wear-resistant agent, 0.2-0.5 parts of hardening agent, 0.5-0.8 parts of auxiliary agent, and 10-25 parts of organic solvent; Wherein, the polymer adhesive is selected from one or both of epoxy-modified polyamide resin and epoxy-modified polyimide resin; The lubricant is selected from one or more of molybdenum disulfide, tungsten disulfide, graphite, Teflon, and iron oxide.

2. The lubricating and wear-resistant coating for railway switch slide according to claim 1 is characterized in that: The polymer adhesive contains 15 to 20 parts of epoxy-modified polyamide resin and 30 to 35 parts of epoxy-modified polyimide resin.

3. The lubricating and wear-resistant coating for railway switch slide according to claim 1, characterized in that: The lubricant contains 8 to 12 parts of molybdenum disulfide, 4 to 6 parts of tungsten disulfide, 0.5 to 1.5 parts of graphite, 2 to 4 parts of Teflon, and 0.5 to 1.5 parts of iron oxide.

4. The lubricating and wear-resistant coating for railway switch slide according to claim 1, characterized in that: The wear-resistant agent is selected from one or more of silicon nitride, silicon carbide and silicon dioxide.

5. The lubricating and wear-resistant coating for railway switch slide according to claim 1, characterized in that: The wear-resistant agent contains 5 to 12 parts of silicon nitride, 2 to 6 parts of silicon carbide and 1 to 3 parts of silicon dioxide.

6. The lubricating and wear-resistant coating for railway switch slide according to claim 1, characterized in that: The hardener is graphene powder with an average particle size of 7 to 12 μm.

7. The lubricating and wear-resistant coating for railway switch slide according to claim 1, characterized in that: The auxiliary agent is one or more of a dispersant, a film-forming agent, an anti-skinning agent, a rheological agent, and a leveling agent.

8. The lubricating and wear-resistant coating for railway switch slide according to claim 7, characterized in that: The auxiliary agents include 0.3 to 0.5 parts of BYK 2013 dispersant, 0.1 to 0.15 parts of BYK 331 leveling agent, and 0.1 to 0.15 parts of BYK-420 rheological agent.

9. The lubricating and wear-resistant coating for railway switch slide according to claim 1, characterized in that: The organic solvent is selected from one or more of xylene, cyclohexanone, ethanol, ethyl ester, and NN-dimethylacetamide.

10. A process for preparing the lubricating and wear-resistant coating for railway switch slides according to any one of claims 1 to 9, characterized in that: The steps include: (1) Organic solvent mixing: Add xylene, cyclohexanone and NN-dimethylacetamide into the dispersion tank in proportion, with an interval of 3 minutes between each addition. Stir for 15 minutes after adding the materials at a speed of 50 rpm; (2) Adding additives: Add BYK 2013 dispersant, BYK 331 leveling agent and BYK-420 rheological agent to the dispersion tank in proportion, with an interval of 5 minutes between each addition. Stir for 20 minutes after adding the materials at a speed of 80 rpm; (3) Adding polymer adhesive: Add epoxy modified polyamide resin in proportion, stir at 60 rpm for 30 minutes, then add epoxy modified polyimide resin in corresponding proportion, stir at 60 rpm for 30 minutes; (4) Adding powder: Add lubricant, anti-wear agent and hardener to the dispersion tank in proportion and stir and disperse them. The interval between two additions is 5 minutes, and the speed is 60 rpm; (5) Coating grinding: Add the above-obtained liquid into a horizontal grinder and grind it 2 to 5 times at a grinding speed of 3000 rpm and a liquid temperature of less than 40°C; (6) Paint filtration: The ground material liquid is filtered by high-speed rotating centrifugal filter. The paint viscosity is tested to be 40±5S (Zai En No. 2 cup), and the average fineness of the paint is tested to be 10±2 microns.

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