Ceramic coating for handrail and preparation process of ceramic coating

Abstract

The invention discloses a ceramic coating for an armrest and a preparation process thereof, and relates to the technical field of armrest coating preparation, the coating material comprises the following components: 45-56% of resin, 25-34% of a curing agent, and 6-10% of a filler; the resin comprises 25-35% of epoxy resin, 5-10% of polyester resin, 1-3% of acrylic acid and 1-3% of polyurethane, and the curing agent comprises 25-34% of hydroxyalkylamide; the filler comprises 0.5-1% of a pigment, 3-8% of an auxiliary agent and 0.5-1% of talcum powder; the preparation process comprises the following steps: preparing and proportioning raw materials; pretreating and dispersing the raw materials; mixing and grinding the raw materials; filtering and adjusting; adding and stirring a curing agent; spraying and curing; processing and detecting; the ceramic coating for the handrail prepared by the preparation process provided by the invention ensures the properties of high corrosion resistance, high wear resistance, high hardness, high temperature resistance, aging resistance and the like of the handrail, and meanwhile, the preparation process is simple, easy to operate and suitable for large-scale industrial production.

Description

Technical Field

[0001] The invention relates to the technical field of handrail coating preparation, and in particular to a ceramic coating for a handrail and a preparation process thereof. Background Art

[0002] The existing handrails for common transportation such as buses and subways are generally made of 304 stainless steel wire drawing, carbon steel pipe PVC spraying, carbon steel pipe plastic coating, etc. The price of stainless steel pipe is high, and the surface corrosion resistance, wear resistance, and scratch resistance of carbon steel pipe PVC spraying and carbon steel pipe plastic coating are poor, and they are easily damaged, corroded, and rusted; in addition, in the existing technology, when processing handrails, most of them are processed by cutting, milling, drilling, welding, and grinding of steel pipes to produce handrails that meet the requirements of public transportation carriages. After a period of use, the handrails processed in this way are prone to scratches, rust, and other defects on the surface, resulting in a short life of the handrails.

[0003] Some handrails in the prior art also use spray coatings to improve the performance of the handrails. However, after long-term use, the coatings in the prior art are easily peeled off due to sweat stains, oxidation, aging and other factors, and have a short service life. Summary of the invention

[0004] In response to the above technical problems, the present invention provides a ceramic coating for handrails and a preparation process thereof, wherein the coating material components are: resin 45-56%, curing agent 25-34%, and filler 6-10%; the resin includes epoxy resin 25-35%, polyester resin 5-10%, acrylic acid 1-3%, and polyurethane 1-3%; the curing agent includes hydroxyalkyl amide 25-34%; the filler includes pigment 0.5-1%, additive 3-8%, and talc 0.5-1%; the additive is composed of: polysilazane 3-8%.

[0005] Furthermore, the thickness of the ceramic coating is 30-300 μm.

[0006] The present invention also provides a preparation process for ceramic coating, which includes the following process: S1. Raw material preparation and proportion: weigh the raw materials according to the proportion of epoxy resin 25-35%, polyester resin 5-10%, acrylic acid 1-3%, polyurethane 1-3%, hydroxyalkylamide 34%, pigment 0.5-1%, talc 0.5-1%, polysilazane 3-8%; by proportioning various raw materials, a ceramic coating for handrails with excellent performance is prepared.

[0007] S2. Pretreatment and dispersion of raw materials: Through the pretreatment and dispersion of raw materials, each raw material is evenly distributed to avoid agglomeration and precipitation, so as to significantly improve the dispersion efficiency and uniformity of raw materials, make the coating more delicate and smooth, and thus improve the overall performance of the coating.

[0008] S3. Mixing and grinding of raw materials: Inject various raw materials into the high-pressure homogenizer and mix them evenly. Use the high pressure homogenizer to provide high pressure and shear force to fully disperse and refine the raw materials during the mixing process. Through mixing and grinding with the high pressure homogenizer, a uniform and delicate coating can be prepared to improve the adhesion and coverage of the coating.

[0009] S4. Filtration and adjustment: Remove impurities and particles from the paint by filtering to ensure the purity and smoothness of the coating; adjust the viscosity of the paint to make it easier to spray and form a uniform coating; filter and adjust the viscosity through a multi-stage filtration system to ensure the stability and firmness of the paint.

[0010] S5. Addition and stirring of curing agent: Inject the curing agent and coating into the dynamic mixing equipment, and use the dynamic mixing equipment to provide a uniform stirring effect to ensure that the curing agent is completely dispersed in the coating; through the stirring of the dynamic mixing equipment, ensure that the curing agent is evenly distributed in the coating, thereby improving the curing effect and stability of the coating.

[0011] S7. Spraying and curing: The paint is sprayed on the treated handrail surface by electrostatic spraying process, and the robot electrostatic spraying technology and intelligent temperature-controlled oven are used to ensure the uniformity and stability of the handrail coating; improve the spraying efficiency and quality of the coating, and reduce the errors and uncertainties of manual operation; the intelligent temperature-controlled oven can ensure the consistency of the curing temperature and curing time of the coating, and improve the overall performance and stability of the coating.

[0012] S7. Processing and testing: The coating is trimmed and optimized to ensure that the quality of the coating meets the requirements. The coating performance is tested and evaluated to ensure that the coating meets the requirements. Processing and testing can be used to promptly identify problems with the coating and repair and optimize them to ensure the quality and reliability of the coating.

[0013] Furthermore, the pretreatment and dispersion of the raw materials in S2 comprises the following steps: S21, mixing the weighed epoxy resin, polyester resin, acrylic acid, polyurethane, hydroxyalkylamide, pigment, talc and polysilazane evenly; S22, dispersing by ultrasonic dispersing equipment, the ultrasonic frequency is 40kHz, and the dispersing time is 30 minutes; S23. After the dispersion is completed, the mixture is taken out and dried until it is completely free of moisture.

[0014] Furthermore, the mixing and grinding of the raw materials in S3 comprises the following steps: S31, adding the raw material powder mixture dried in S23 into a high-pressure homogenizer; S32, start the high-pressure homogenizer for mixing and grinding, set the pressure to 50MPa, and grind until the coating fineness reaches 30-80um; S33, after grinding, take samples for testing to ensure that the fineness meets the requirements. If it does not meet the requirements, continue grinding until the paint fineness reaches 30-80um; S34. Gradually add ethanol dispersant during the grinding process to ensure that the powder is completely dispersed in the resin.

[0015] Furthermore, the filtering and adjusting in S4 includes the following steps: S41. Filter the coating using a multi-stage filtration system to remove impurities and particles; S42. Adjust the viscosity of the paint as needed to ensure good fluidity and uniformity during spraying.

[0016] Furthermore, the adding and stirring of the curing agent in S5 comprises the following steps: S51, adding the weighed hydroxyalkylamide to the coating; S52. Use a dynamic mixing device for stirring, set the speed to 800 rpm, and the stirring time to 15 minutes to ensure that the hydroxyalkylamide is completely dispersed in the coating.

[0017] Furthermore, the coating construction in S6 comprises the following steps: S61. Use robot spraying technology to evenly spray the paint on the surface of the object to be coated; before spraying, treat the surface of the handrail to ensure that the surface of the handrail is clean, dry and free of oil stains; S62. After spraying, the handrail is placed in an intelligent temperature-controlled oven for curing; the oven temperature is set to 200 degrees Celsius, and the curing time is 10-30 minutes. During the high-temperature curing process, silicon dioxide nano-ceramics and silicon carbide nitride are generated; S63. During the curing process, the temperature and humidity in the oven are monitored in real time through the intelligent temperature control system to ensure the consistency and stability of the curing process.

[0018] Further, the processing and detection in S7 includes the following steps: S71. After curing, take out the handrail and inspect its appearance to ensure that the coating is smooth, without missing coating or bubble defects; S72. Test the performance of the handrail coating, including hardness, wear resistance, high temperature resistance and adhesion; S73. Determine whether the coating meets the requirements based on the test results to ensure that the handrail has the properties of corrosion resistance, wear resistance, high hardness, high temperature resistance and aging resistance.

[0019] Compared with the prior art, the present invention has the following beneficial effects: (1) The ceramic coating for handrails prepared by the present invention ensures the high corrosion resistance, high wear resistance, high hardness, high temperature resistance, aging resistance and other properties of the handrails. At the same time, the preparation process of the present invention is simple and easy to operate, and is suitable for large-scale industrial production; (2) The present invention can cure a variety of raw materials on the handrails at high temperature using an electrostatic spraying process. During the spraying process, the existing spraying production line equipment can be used for spraying, and production can be carried out without adding new equipment to the factory, thereby lowering the promotion threshold for mass production; (3) The ceramic coating prepared by the present invention improves the comprehensive performance of the coating by selecting a variety of resin powders, curing agents and corresponding fillers; (4) The preparation process provided by the present invention adopts high-speed stirring, grinding and filtering, electrostatic spraying, high-temperature curing and other process steps to ensure the uniformity and stability of the coating. At the same time, the present invention can detect the fineness of the raw material grinding during the grinding process, further providing a uniform mixing of the raw materials, and can comprehensively detect the performance of the coating after the spraying and curing is completed, thereby ensuring that the coating meets the high performance requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the preparation process of the present invention. DETAILED DESCRIPTION

[0021] The present invention will be further described below in conjunction with specific embodiments. The illustrative embodiments and descriptions of the present invention are used to explain the present invention but are not intended to limit the present invention.

[0022] Example: Figure 1 A ceramic coating for handrails and a preparation process thereof are shown, wherein the coating material composition is: resin 45-56%, curing agent 25-34%, filler 6-10%; the resin includes epoxy resin 25-35%, polyester resin 5-10%, acrylic acid 1-3%, polyurethane 1-3%, the curing agent includes hydroxyalkyl amide 25-34%; the filler includes pigment 0.5-1%, additive 3-8%, talcum powder 0.5-1%; the additive composition is: polysilazane 3-8%.

[0023] Furthermore, the thickness of the ceramic coating is 30-300 μm.

[0024] The present invention also provides a preparation process for ceramic coating, which includes the following process: S1. Raw material preparation and proportion: weigh the raw materials according to the proportion of epoxy resin 25-35%, polyester resin 5-10%, acrylic acid 1-3%, polyurethane 1-3%, hydroxyalkylamide 34%, pigment 0.5-1%, talc 0.5-1%, polysilazane 3-8%; by proportioning various raw materials, a ceramic coating for handrails with excellent performance is prepared.

[0025] S2. Pretreatment and dispersion of raw materials: Through the pretreatment and dispersion of raw materials, each raw material is evenly distributed to avoid agglomeration and precipitation, so as to significantly improve the dispersion efficiency and uniformity of raw materials, make the coating more delicate and smooth, and thus improve the overall performance of the coating.

[0026] S3. Mixing and grinding of raw materials: Inject various raw materials into the high-pressure homogenizer and mix them evenly. Use the high pressure homogenizer to provide high pressure and shear force to fully disperse and refine the raw materials during the mixing process. Through mixing and grinding with the high pressure homogenizer, a uniform and delicate coating can be prepared to improve the adhesion and coverage of the coating.

[0027] S4. Filtration and adjustment: Remove impurities and particles from the paint by filtering to ensure the purity and smoothness of the coating; adjust the viscosity of the paint to make it easier to spray and form a uniform coating; filter and adjust the viscosity through a multi-stage filtration system to ensure the stability and firmness of the paint.

[0028] S5. Addition and stirring of curing agent: Inject the curing agent and coating into the dynamic mixing equipment, and use the dynamic mixing equipment to provide a uniform stirring effect to ensure that the curing agent is completely dispersed in the coating; through the stirring of the dynamic mixing equipment, ensure that the curing agent is evenly distributed in the coating, thereby improving the curing effect and stability of the coating.

[0029] S7. Spraying and curing: The paint is sprayed on the treated handrail surface by electrostatic spraying process, and the robot electrostatic spraying technology and intelligent temperature-controlled oven are used to ensure the uniformity and stability of the handrail coating; improve the spraying efficiency and quality of the coating, and reduce the errors and uncertainties of manual operation; the intelligent temperature-controlled oven can ensure the consistency of the curing temperature and curing time of the coating, and improve the overall performance and stability of the coating.

[0030] S7. Processing and testing: The coating is trimmed and optimized to ensure that the quality of the coating meets the requirements. The coating performance is tested and evaluated to ensure that the coating meets the requirements. Processing and testing can be used to promptly identify problems with the coating and repair and optimize them to ensure the quality and reliability of the coating.

[0031] Furthermore, the pretreatment and dispersion of the raw materials in S2 comprises the following steps: S21, mixing the weighed epoxy resin, polyester resin, acrylic acid, polyurethane, hydroxyalkylamide, pigment, talc and polysilazane evenly; S22, dispersing by ultrasonic dispersing equipment, the ultrasonic frequency is 40kHz, and the dispersing time is 30 minutes; S23. After the dispersion is completed, the mixture is taken out and dried until it is completely free of moisture.

[0032] Furthermore, the mixing and grinding of the raw materials in S3 comprises the following steps: S31, adding the raw material powder mixture dried in S23 into a high-pressure homogenizer; S32, start the high-pressure homogenizer for mixing and grinding, set the pressure to 50MPa, and grind until the coating fineness reaches 30-80um; S33, after grinding, take samples for testing to ensure that the fineness meets the requirements. If it does not meet the requirements, continue grinding until the paint fineness reaches 30-80um; S34. Gradually add ethanol dispersant during the grinding process to ensure that the powder is completely dispersed in the resin.

[0033] Furthermore, the filtering and adjusting in S4 includes the following steps: S41. Filter the coating using a multi-stage filtration system to remove impurities and particles; S42. Adjust the viscosity of the paint as needed to ensure good fluidity and uniformity during spraying.

[0034] Furthermore, the adding and stirring of the curing agent in S5 comprises the following steps: S51, adding the weighed hydroxyalkylamide to the coating; S52. Use a dynamic mixing device for stirring, set the speed to 800 rpm, and the stirring time to 15 minutes to ensure that the hydroxyalkylamide is completely dispersed in the coating.

[0035] Furthermore, the coating construction in S6 comprises the following steps: S61. Use robot spraying technology to evenly spray the paint on the surface of the object to be coated; before spraying, treat the surface of the handrail to ensure that the surface of the handrail is clean, dry and free of oil stains; S62. After spraying, the handrail is placed in an intelligent temperature-controlled oven for curing; the oven temperature is set to 200 degrees Celsius, and the curing time is 10-30 minutes. During the high-temperature curing process, silicon dioxide nano-ceramics and silicon carbide nitride are generated; S63. During the curing process, the temperature and humidity in the oven are monitored in real time through the intelligent temperature control system to ensure the consistency and stability of the curing process.

[0036] Further, the processing and detection in S7 includes the following steps: S71. After curing, take out the handrail and inspect its appearance to ensure that the coating is smooth, without any missing coating, bubbles or other defects; S72. Test the performance of the handrail coating, including hardness, wear resistance, high temperature resistance and adhesion; S73. Determine whether the coating meets the requirements based on the test results to ensure that the handrail has the properties of corrosion resistance, wear resistance, high hardness, high temperature resistance and aging resistance.

[0037] The ceramic coating for handrails prepared by the preparation process provided by the present invention was tested, and the test results obtained are shown in the following table:

Claims

1. A ceramic coating for a handrail, characterized in that: The coating material comprises: 45-56% resin, 25-34% curing agent and 6-10% filler; the resin comprises 25-35% epoxy resin, 5-10% polyester resin, 1-3% acrylic acid and 1-3% polyurethane; the curing agent comprises 25-34% hydroxyalkyl amide; the filler comprises 0.5-1% pigment, 3-8% auxiliary agent and 0.5-1% talc; the auxiliary agent comprises: 3-8% polysilazane.

2. A ceramic coating for a handrail, characterized in that: The thickness of the ceramic coating is 30-300 μm.

3. A process for preparing the ceramic coating as claimed in claim 2, characterized in that: The following processes are included: S1. Raw material preparation and proportion: weigh the raw materials according to the proportion of 25-35% epoxy resin, 5-10% polyester resin, 1-3% acrylic acid, 1-3% polyurethane, 34% hydroxyalkylamide, 0.5-1% pigment, 0.5-1% talc, and 3-8% polysilazane; prepare a ceramic coating for handrails with excellent performance by proportioning various raw materials; S2. Pretreatment and dispersion of raw materials: Through pretreatment and dispersion of raw materials, each raw material is evenly distributed to avoid agglomeration and precipitation, so as to significantly improve the dispersion efficiency and uniformity of raw materials, make the coating more delicate and smooth, and thus improve the overall performance of the coating; S3. Mixing and grinding of raw materials: Inject various raw materials into the high-pressure homogenizer and mix them evenly. Use the high-pressure homogenizer to provide high pressure and shear force to fully disperse and refine the raw materials during the mixing process; Through mixing and grinding by the high-pressure homogenizer, a uniform and delicate coating is prepared to improve the adhesion and coverage of the coating; S4, Filtration and adjustment: Remove impurities and particles in the paint by filtering to ensure the purity and smoothness of the coating; adjust the viscosity of the paint to make it easier to spray and form a uniform coating; filter and adjust the viscosity of the multi-stage filtration system to ensure the stability and firmness of the paint; S5. Adding and stirring the curing agent: Inject the curing agent and the coating into the dynamic mixing device, and use the dynamic mixing device to provide a uniform stirring effect to ensure that the curing agent is completely dispersed in the coating; Through the stirring of dynamic mixing equipment, the curing agent is ensured to be evenly distributed in the coating, thus improving the curing effect and stability of the coating; S7, spray curing: spray the coating on the treated handrail surface by electrostatic spraying process, using robot electrostatic spraying technology and intelligent temperature control oven to ensure the uniformity and stability of the handrail coating; Improve the spraying efficiency and quality of the coating, and reduce the errors and uncertainties of manual operation; the intelligent temperature-controlled oven can ensure the consistency of the curing temperature and curing time of the coating, and improve the overall performance and stability of the coating; S7. Processing and testing: The coating is trimmed and optimized to ensure that the quality of the coating meets the requirements. The coating performance is tested and evaluated to ensure that the coating meets the requirements. Processing and testing can be used to promptly identify problems with the coating and repair and optimize them to ensure the quality and reliability of the coating.

4. A process for preparing the ceramic coating as claimed in claim 3, characterized in that: The pretreatment and dispersion of the raw materials in S2 comprises the following steps: S21, mixing the weighed epoxy resin, polyester resin, acrylic acid, polyurethane, hydroxyalkylamide, pigment, talc and polysilazane evenly; S22, dispersing by ultrasonic dispersing equipment, the ultrasonic frequency is 40kHz, and the dispersing time is 30 minutes; S23. After the dispersion is completed, the mixture is taken out and dried until it is completely free of moisture.

5. A process for preparing the ceramic coating as claimed in claim 4, characterized in that: The mixing and grinding of the raw materials in S3 comprises the following steps: S31, adding the raw material powder mixture dried in S23 into a high-pressure homogenizer; S32, start the high-pressure homogenizer for mixing and grinding, set the pressure to 50MPa, and grind until the coating fineness reaches 30-80um; S33, after grinding, take samples for testing to ensure that the fineness meets the requirements. If it does not meet the requirements, continue grinding until the paint fineness reaches 30-80um; S34. Gradually add ethanol dispersant during the grinding process to ensure that the powder is completely dispersed in the resin.

6. A process for preparing the ceramic coating as claimed in claim 5, characterized in that: The filtering and adjustment in S4 includes the following steps: S41. Filter the coating using a multi-stage filtration system to remove impurities and particles; S42. Adjust the viscosity of the paint as needed to ensure good fluidity and uniformity during spraying.

7. A process for preparing the ceramic coating as claimed in claim 6, characterized in that: The adding and stirring of the curing agent in S5 comprises the following steps: S51, adding the weighed hydroxyalkylamide to the coating; S52. Use a dynamic mixing device for stirring, set the speed to 800 rpm, and the stirring time to 15 minutes to ensure that the hydroxyalkylamide is completely dispersed in the coating.

8. A process for preparing the ceramic coating as claimed in claim 7, characterized in that: The coating construction in S6 comprises the following steps: S61. Use robot spraying technology to evenly spray the paint on the surface of the object to be coated; before spraying, treat the surface of the handrail to ensure that the surface of the handrail is clean, dry and free of oil stains; S62. After spraying, the handrail is placed in an intelligent temperature-controlled oven for curing; the oven temperature is set to 200 degrees Celsius, and the curing time is 10-30 minutes. During the high-temperature curing process, silicon dioxide nano-ceramics and silicon carbide nitride are generated; S63. During the curing process, the temperature and humidity in the oven are monitored in real time through the intelligent temperature control system to ensure the consistency and stability of the curing process.

9. A process for preparing the ceramic coating as claimed in claim 8, characterized in that: The processing and detection in S7 includes the following steps: S71. After curing, take out the handrail and inspect its appearance to ensure that the coating is smooth, without missing coating or bubble defects; S72. Test the performance of the handrail coating, including hardness, wear resistance, high temperature resistance and adhesion; S73. Determine whether the coating meets the requirements based on the test results to ensure that the handrail has the properties of corrosion resistance, wear resistance, high hardness, high temperature resistance and aging resistance.

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