Metal surface high-performance coating agent and preparation method thereof

Abstract

The invention discloses a metal surface high-performance coating agent and a preparation method thereof. The metal surface high-performance coating agent comprises the following components in percentage by mass: 20-30wt% of ceramic particles; 5-10 wt% of a nano reinforcing agent; 40 to 50 wt% of a high-molecular polymer; 5 to 10 wt% of a surfactant; and 10%-20% by weight of a solvent. Dynamic modification of the metal surface is achieved through the specific inorganic nonmetal composite material, a repairing layer with the ultralow friction coefficient, high strength, high temperature resistance and corrosion resistance is formed, and therefore the operation efficiency and durability of mechanical equipment are improved, and the preparation method is simple.

Description

Technical Field

[0001] The invention relates to the technical field of metal surface treatment, and in particular to a high-performance coating agent for metal surface and a preparation method thereof. Background Art

[0002] Traditional metal surface treatment technologies, such as spraying and electroplating, can improve the performance of metal surfaces to a certain extent, but they have problems such as complex processes, high costs, and severe environmental pollution. In particular, key components such as engines often suffer from performance degradation during operation due to friction and wear, which in turn affects fuel efficiency and mechanical life. Although high-performance coatings for metal surfaces in the prior art have certain effects, they often have shortcomings such as low repair efficiency, poor durability, and a significant impact on the lubrication performance of the original engine oil. Summary of the invention

[0003] The purpose of the present invention is to provide a high-performance coating for metal surface and a preparation method thereof, which realizes dynamic modification of the metal surface through a specific inorganic non-metallic composite material to form a repair layer with ultra-low friction coefficient, high strength, high temperature resistance and corrosion resistance, thereby improving the operating efficiency and durability of mechanical equipment, and is particularly suitable for surface treatment of key mechanical parts such as engines.

[0004] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0005] In one aspect, the present invention provides a high-performance coating for metal surfaces, comprising the following components in a mass ratio:

[0006] Ceramic particles: 20-30wt%;

[0007] Nano-enhancer: 5-10 wt%;

[0008] High molecular weight polymer: 40-50wt%;

[0009] Surfactant: 5-10wt%;

[0010] Solvent: 10%~20wt%.

[0011] Further, the following components are included in mass ratio:

[0012] Ceramic particles: 25wt%;

[0013] Nano-enhancement agent: 8wt%;

[0014] High molecular weight polymer: 42wt%;

[0015] Surfactant: 10wt%;

[0016] Solvent: 15wt%.

[0017] The ceramic particles, as the main component of the repair agent, can provide excellent hardness, wear resistance and high temperature resistance. The particle size of the ceramic particles is usually in the range of nanometer to micrometer to ensure that they can be evenly dispersed in the repair agent and effectively form a repair layer.

[0018] Furthermore, the ceramic particles are one or more of aluminum oxide particles, zirconium oxide particles, zirconium oxide particles, silicon carbide particles, silicon nitride particles, boron nitride particles and silicon dioxide particles.

[0019] The nano-enhancer is used to enhance the strength, toughness and wear resistance of the repair layer, while improving its bonding force with the metal surface.

[0020] Furthermore, the nano-enhancer is one or more of nano-silicon dioxide, nano-aluminum oxide, nano-silicon carbide, nano-silicon nitride, nano-graphene, nano-carbon nanotubes, and nano-metal particles.

[0021] The high molecular polymer, as the base material of the repair agent, has excellent adhesion and wear resistance. It can form a tight bonding layer with the metal surface to ensure that the repair layer will not fall off during the operation of the mechanical equipment.

[0022] Furthermore, the high molecular polymer is one or more of polyacrylate polymers, polyurethane polymers, epoxy resin polymers, polyimide polymers, polyolefin polymers, polysiloxane polymers or high molecular polymers with repairing function.

[0023] The surfactant is used to improve the wettability and dispersibility of the repair agent on the metal surface, ensuring that the ceramic particles and nano-enhancers can be evenly distributed on the metal surface. At the same time, it can also improve the bonding force between the repair agent and the metal surface, further enhancing the stability and durability of the repair layer.

[0024] Furthermore, the surfactant is one or more of a fluorine surfactant, a silicon surfactant, a metal surfactant, and a boron surfactant.

[0025] The surfactant may also be other special surfactants, such as phosphates, sulfonates, carboxylates, etc., which can improve the dispersibility and stability of the repair agent on the metal surface and improve the uniformity and density of the repair layer.

[0026] The solvent is used to dissolve the high molecular weight polymer and adjust the viscosity of the repair agent, and affects the wettability and dispersibility of the repair agent on the metal surface.

[0027] Furthermore, the solvent is any one or more of acetone, ethanol, toluene, xylene, ethyl acetate, and butanone.

[0028] The solvent may also be other solvents, such as cyclohexanone, ethylene glycol ethyl ether, etc. These solvents also have different solubility and volatility characteristics.

[0029] On the other hand, the present invention also provides a method for preparing a high-performance coating for a metal surface, comprising the following steps:

[0030] S1. Weigh the ceramic particles, nano-enhancer, polymer, surfactant and solvent of different masses and mix them evenly to obtain a mixture;

[0031] S2. The mixture is subjected to a curing reaction at room temperature to 100° C. or 150 to 200° C. and normal pressure, and after the reaction is completed, the mixture is cooled to room temperature or below room temperature to obtain the repair agent.

[0032] When the high molecular polymer is a thermoplastic resin or a polymer thereof, such as a polyacrylate polymer, a polyolefin polymer, etc., the curing reaction is carried out at 150 to 200°C; when the high molecular polymer is a thermosetting resin or a polymer thereof, such as a polyurethane polymer, an epoxy resin polymer, a polyimide polymer, a polysiloxane polymer, etc., the curing reaction is carried out at room temperature to 100°C. Through the above reaction and cooling, the repair agent is cured and has good wettability and adhesion, wear resistance and corrosion resistance.

[0033] The application of the repair agent of the present invention generally includes:

[0034] Direct addition: Add the repair agent directly to the lubricating oil of the mechanical equipment, and transport the repair agent to the contact area of ​​the metal friction pair through the circulation of the lubricating oil.

[0035] Surface coating: Use coating equipment to evenly apply the repair agent on the metal surface to form a tightly adhered repair layer.

[0036] Dipping treatment: Immerse the metal parts in the repair agent so that the repair agent can fully penetrate into the metal surface and tiny cracks to form a repair layer.

[0037] Compared with the prior art, the present invention has the following beneficial effects:

[0038] During the operation of mechanical equipment, when the metal friction pair contacts and produces wear, a thin layer of metal oxide may be formed on the metal surface under the action of friction heat. The ceramic particles in the repair agent usually carry hydroxyl groups or other active functional groups to form metal-oxygen-ceramic bonds (MOC bonds), which enhance the bonding force between the repair layer and the metal matrix; under the action of friction and friction heat, the nano-enhancer can penetrate into the tiny cracks or pores on the metal surface, and tightly bond with the metal surface through physical adsorption and chemical cross-linking, enhancing its repair ability; some other organic compounds in the repair agent will undergo pyrolysis at high temperatures to produce free radicals or active functional groups, which will react chemically with the metal surface to form new chemical bonds, enhancing the bonding force between the repair layer and the metal matrix. The present invention does not require additional processing steps, is easy to operate, non-toxic and harmless, and is environmentally friendly. The repair layer has the characteristics of ultra-low friction coefficient, high strength, high temperature resistance and corrosion resistance, and can effectively reduce friction and wear, improve the operating efficiency of mechanical equipment, and reduce fuel consumption and emissions. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical scheme and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0040] Example 1

[0041] As a preferred embodiment of the present invention, the components of the high-performance coating for metal surface disclosed in this embodiment are shown in Table 1.

[0042] Table 1

[0043] Components Mass ratio / wt% Ceramic particles 20 Nano-enhancement agents 10 High molecular weight polymer 50 Surfactants 10 Solvents 10

[0044] In this embodiment, the ceramic particles are aluminum oxide (Al 2 O 3 ) particles, alumina particles have the characteristics of high hardness, high wear resistance, high melting point and good chemical stability. In the repair agent, they can provide excellent wear resistance and corrosion resistance.

[0045] In this embodiment, the nano-enhancer is nano-alumina (Al 2 O 3 ), nano-alumina has a high specific surface area and activity, which can significantly improve the strength and toughness of the repair layer, while enhancing its adhesion to the metal surface.

[0046] In this embodiment, the high molecular polymer is a polysiloxane polymer, which has excellent weather resistance, water resistance and chemical corrosion resistance. In the repair agent, polysiloxane can be used as the main matrix material to enhance the chemical corrosion resistance.

[0047] In this embodiment, the surfactant is a silicon surfactant. The silicon surfactant has a silicon atom as its core and is endowed with specific surface activity by changing the functional groups around it. It can improve the wear resistance and corrosion resistance of the repair layer in the repair agent, while improving its bonding with the metal surface.

[0048] In this embodiment, the solvent is ethyl acetate, which is an ester solvent with good solubility and volatility. In the repair agent, ethyl acetate can be used as a solvent to help dissolve the high molecular polymer and improve the wettability and dispersibility of the repair agent.

[0049] Weigh the ceramic particles, nano-enhancer, high molecular polymer, surfactant, and solvent of various weights shown in Table 1 and mix them evenly to obtain a mixture;

[0050] The mixture is subjected to a curing reaction at room temperature to 100° C. or 150 to 200° C. and normal pressure, and after the reaction is completed, the mixture is cooled to room temperature or below room temperature to obtain the repair agent of this embodiment.

[0051] Example 2

[0052] As a preferred embodiment of the present invention, the components of the high-performance coating for metal surface disclosed in this embodiment are shown in Table 2.

[0053] Table 2

[0054] Components Mass ratio % Ceramic particles 30 Nano-enhancement agents 5 High molecular weight polymer 40 Surfactants 5 Solvents 20

[0055] In this embodiment, the ceramic particles are zirconium oxide (ZrO 2 ) particles, zirconium oxide particles have the characteristics of high strength, high hardness, high corrosion resistance, good high temperature stability, good chemical stability and excellent mechanical properties. In the repair agent, they can improve the hardness and high temperature resistance of the repair layer.

[0056] In this embodiment, the nano-reinforcement agent is nano-silicon carbide (SiC). Nano-silicon carbide has extremely high hardness and wear resistance. Adding nano-silicon carbide to the repair agent can significantly improve the wear resistance and impact resistance of the repair layer.

[0057] In this embodiment, the high molecular polymer is a polyacrylate polymer, which has good adhesion and wear resistance. In the repair agent, the polyacrylate polymer can be used as a matrix material to form a repair layer together with ceramic particles and nano-enhancers.

[0058] In this embodiment, the surfactant is a boron surfactant, which is synthesized from boric acid and alcohols. The boron atom and oxygen atom in the molecule form a semi-polar bond and have special surface activity. The boron surfactant in the repair agent can enhance the hardness and wear resistance of the repair layer, and improve its stability in a high temperature environment.

[0059] In this embodiment, the solvent is acetone, which has good solubility and volatility. In the repair agent, acetone can dissolve high molecular polymers and help adjust the viscosity of the repair agent.

[0060] Weigh the ceramic particles, nano-enhancer, high molecular polymer, surfactant, and solvent of various weights shown in Table 2 and mix them evenly to obtain a mixture;

[0061] The mixture is subjected to a curing reaction at room temperature to 100° C. or 150 to 200° C. and normal pressure, and after the reaction is completed, the mixture is cooled to room temperature or below room temperature to obtain the repair agent of this embodiment.

[0062] Example 3

[0063] As a preferred embodiment of the present invention, the components of the high-performance coating for metal surface disclosed in this embodiment are shown in Table 3.

[0064] Table 3

[0065] Components Mass ratio % Ceramic particles 25 Nano-enhancement agents 8 High molecular weight polymer 42 Surfactants 10 Solvents 15

[0066] In this embodiment, the ceramic particles are silicon carbide (SiC) particles. Silicon carbide particles have the characteristics of high hardness, high strength, high wear resistance, good high temperature stability, good chemical stability, and excellent mechanical properties. In the repair agent, they can significantly improve the wear resistance and high temperature resistance of the repair layer.

[0067] In this embodiment, the nano-enhancer is nano-silicon dioxide (SiO 2 ), nano-silicon dioxide has high hardness, high wear resistance and high chemical stability, which can enhance the hardness and wear resistance of the repair layer and improve its bonding force with the metal surface.

[0068] In this embodiment, the high molecular polymer is an epoxy resin polymer, which has high strength, high hardness and good adhesion. In the repair agent, the epoxy resin can be used as a binder to firmly adhere the ceramic particles and the nano-reinforcement agent to the metal surface.

[0069] In this embodiment, the surfactant is a fluorine surfactant, which has a special fluorine-carbon chain structure and can significantly reduce the surface tension of the metal surface and improve the wettability and permeability of the repair agent. The fluorine surfactant also has good chemical stability and high temperature resistance.

[0070] In this embodiment, the solvent is toluene, which is an aromatic hydrocarbon solvent with strong dissolving power. In the repair agent, toluene can be used as a solvent to help dissolve high molecular polymers and other additives.

[0071] Weigh the ceramic particles, nano-enhancer, high molecular polymer, surfactant, and solvent of various weights shown in Table 3 and mix them evenly to obtain a mixture;

[0072] The mixture is subjected to a curing reaction at room temperature to 100° C. or 150 to 200° C. and normal pressure, and after the reaction is completed, the mixture is cooled to room temperature or below room temperature to obtain the repair agent of this embodiment.

[0073] Example 4

[0074] As a preferred embodiment of the present invention, the components of the high-performance coating for metal surface disclosed in this embodiment are shown in Table 4.

[0075] Table 4

[0076]

[0077]

[0078] In this embodiment, the ceramic particles are silicon nitride (Si 3 N 4 ) particles, silicon nitride particles have the characteristics of high hardness, high strength, high wear resistance, good high temperature stability, good chemical stability and excellent mechanical properties. In the repair agent, they can significantly improve the wear resistance and high temperature resistance of the repair layer.

[0079] In this embodiment, the nano-enhancer is carbon nanotubes (CNTs). Carbon nanotubes have extremely high aspect ratio and mechanical strength, and can enhance the toughness and fatigue resistance of the repair layer, while improving its electrical conductivity and thermal conductivity.

[0080] In this embodiment, the high molecular polymer is a polyolefin polymer, specifically polypropylene, which has good chemical corrosion resistance and processing performance. In the repair agent, the polyolefin polymer can be used as an auxiliary matrix material to provide additional chemical corrosion resistance.

[0081] In this embodiment, the surfactant is a metal surfactant, specifically an alkyl imidazoline. The metal surfactant contains metal elements or metal ions, and can form chemical bonds or coordination bonds with the metal surface, thereby improving the binding force and adhesion between the repair agent and the metal surface. The metal surfactant also has good corrosion inhibition and rust prevention properties, which helps to protect the metal surface from corrosion and oxidation.

[0082] In this embodiment, the solvent is ethanol, which has low toxicity and flammability. In the repair agent, ethanol can be used as a solvent and diluent to improve the fluidity and wettability of the repair agent.

[0083] Weigh the ceramic particles, nano-enhancer, high molecular polymer, surfactant, and solvent of various weights shown in Table 4 and mix them evenly to obtain a mixture;

[0084] The mixture is subjected to a curing reaction at room temperature to 100° C. or 150 to 200° C. and normal pressure, and after the reaction is completed, the mixture is cooled to room temperature or below room temperature to obtain the repair agent of this embodiment.

[0085] Comparative Example 1

[0086] The repairing agent of this comparative example is the same as that of Example 1 except that no nano-reinforcement agent is added and the mass ratio of the ceramic particles is adjusted to 30wt%.

[0087] Comparative Example 2

[0088] The repairing agent of this comparative example is the same as that of Example 1 except that no surfactant is added and the mass ratio of the ceramic particles is adjusted to 30wt%.

[0089] Comparative Example 3

[0090] The repairing agent of this comparative example does not cure the mixture at room temperature to 100° C. or 150 to 200° C. and normal pressure, and the rest is the same as Example 1.

[0091] Comparative Example 4

[0092] The repair agent of this comparative example adopts a commercially available repair agent purchased from Dongguan Haoteng Adhesive Products Co., Ltd.

[0093] Test example

[0094] The repair agent of each embodiment and comparative example is directly added to the lubricating oil, and the added mass of the repair agent is 5% of the mass of the lubricating oil. The repair agent is transported to the surface of the rolling bearing through the circulation of the lubricating oil. The lubricating oil without any repair agent is used as the control group to test the operation of the rolling bearing. The test results are shown in Table 5.

[0095] Table 5

[0096]

[0097] As shown in Table 5, compared with the control group, the repair agent of the present invention can effectively reduce the friction coefficient of the bearing surface and the loss of the bearing after 100,000 revolutions, so as to reduce the wear intensity of the bearing surface and extend the service life of the bearing; It can be seen from the data of Comparative Examples 1 to 4 that the components and curing treatment of the present invention have beneficial effects on the operation of rolling bearings, reduce the loss of rolling bearings, and improve their operating efficiency and durability.

[0098] Finally, it should be noted that the above embodiments are only preferred embodiments of the present invention to illustrate the technical solutions of the present invention, rather than limiting them, and certainly not limiting the patent scope of the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention. In other words, any changes or modifications made to the main design concept and spirit of the present invention that have no substantive significance, and the technical problems they solve are still consistent with the present invention, should be included in the protection scope of the present invention. In addition, the direct or indirect application of the technical solutions of the present invention in other related technical fields is also included in the patent protection scope of the present invention.

Claims

1. A high-performance coating for metal surfaces, characterized in that: The following components are included in mass ratio: Ceramic particles: 20-30wt%; Nano-enhancer: 5-10wt%; High molecular weight polymer: 40-50wt%; Surfactant: 5-10wt%; Solvent: 10%~20wt%.

2. The high performance coating for metal surface according to claim 1, characterized in that: The following components are included in mass ratio: Ceramic particles: 25wt%; Nano-enhancement agent: 8wt%; High molecular weight polymer: 42wt%; Surfactant: 10wt%; Solvent: 15wt%.

3. The high performance coating for metal surface according to claim 1, characterized in that: The ceramic particles are one or more of aluminum oxide particles, zirconium oxide particles, zirconium oxide particles, silicon carbide particles, silicon nitride particles, boron nitride particles and silicon dioxide particles.

4. The high performance coating for metal surface according to claim 1, characterized in that: The nano-enhancer is one or more of nano-silicon dioxide, nano-aluminum oxide, nano-silicon carbide, nano-silicon nitride, nano-graphene, nano-carbon nanotubes, and nano-metal particles.

5. The high performance coating for metal surface according to claim 1, characterized in that: The high molecular polymer is one or more of polyacrylate polymers, polyurethane polymers, epoxy resin polymers, polyimide polymers, polyolefin polymers, polysiloxane polymers or high molecular polymers with repairing function.

6. The high performance coating for metal surface according to claim 1, characterized in that: The surfactant is one or more of a fluorine surfactant, a silicon surfactant, a metal surfactant, and a boron surfactant.

7. The high performance coating for metal surface according to claim 1, characterized in that: The solvent is any one or more of acetone, ethanol, toluene, xylene, ethyl acetate, and butanone.

8. The method for preparing a high-performance coating for metal surface according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1. Weigh the ceramic particles, nano-enhancer, polymer, surfactant and solvent of different masses and mix them evenly to obtain a mixture; S2. The mixture is subjected to a curing reaction at room temperature to 100° C. or 150 to 200° C. and normal pressure, and after the reaction is completed, the mixture is cooled to room temperature or below room temperature to obtain the repair agent.

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