Novel spraying process for coating heat conduction

Abstract

According to the novel coating heat conduction spraying process, in the step S2, a high-temperature heating curing oven is preheated firstly, then heat of the high-temperature heating curing oven is used for conducting heat transfer on an electrostatic powder spraying gun, the electrostatic powder spraying gun is preheated, and the charged performance of powder particles can be affected by temperature changes; proper air temperature is beneficial for improving the electrification performance of the powder, so that powder particles are more uniformly attached to the surface of a sprayed object, then the temperature in a heat preservation chamber is controlled to be 20 DEG C, temperature evaporation is carried out in an evaporation water tank at the lower end, and water vapor improves the coating performance and helps a curing agent to generate a cross-linking reaction; the triglycidyl isocyanurate (TGIC) curing agent reacts with water vapor at a high temperature to form a cross-linked network, so that the hardness and durability of the coating are enhanced.

Description

Technical Field

[0001] The invention relates to the technical field of aluminum alloy coating spraying, in particular to a new type of coating heat conduction spraying process. Background Art

[0002] Powder coating is fed into the spray gun by the powder supply system with the help of compressed air. A high voltage electrostatic generator is applied to the front end of the spray gun to generate high voltage. Due to corona discharge, dense electric charges are generated near it. When the powder is sprayed from the nozzle, charged coating particles are formed. Under the action of electrostatic force, they are attracted to the aluminum profile with the opposite polarity. As the amount of powder sprayed increases, the charge accumulates more. When it reaches a certain thickness, it stops adsorbing due to the electrostatic repulsion, so that the entire aluminum profile obtains a certain thickness of powder coating. Then, the powder coating is melted, leveled, and solidified through heating, forming a hard coating film on the surface of the profile.

[0003] Patent No. CN201310733693.0 is a method for spraying a titanium coating on a substrate, which includes a substrate pretreatment step for removing grease and dust from the substrate surface; one or more spraying steps to prepare a titanium coating on the substrate surface; and a coating post-processing step. The present invention uses supersonic plasma to spray a pure titanium coating, which can spray a titanium layer on a substrate such as steel, aluminum, or aluminum alloy. By adopting titanium coating technology, the original titanium equipment can be made of steel, aluminum, or aluminum alloy, and then sprayed with a titanium coating. This can also give the equipment the excellent corrosion resistance of titanium equipment while reducing the manufacturing cost of the equipment. However, this method has the following problems: first, it cannot utilize the heat during heating and curing. Second, it cannot control the temperature during the spraying process, and it cannot use heat to generate water vapor to improve the coating quality. Summary of the Invention

[0004] The purpose of the present invention is to address the shortcomings of the existing technology. In step S2, the high-temperature heating and curing furnace is first preheated, and then the heat of the high-temperature heating and curing furnace is used to transfer heat to the electrostatic powder spray gun to preheat the electrostatic powder spray gun. The temperature change will affect the charging properties of the powder particles, thereby affecting the flight trajectory and adhesion of the powder. The appropriate temperature helps to improve the charging properties of the powder, so that the powder particles are more evenly attached to the surface of the sprayed object. Then, the temperature in the heat preservation chamber is controlled at 20°C, and the evaporation pool at the lower end is used for temperature evaporation. The water vapor improves the coating performance, which solves the problem that the spraying process in the existing technology cannot control the temperature during the spraying process and cannot use heat to generate water vapor to improve the coating quality.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A novel coating heat conduction spraying process includes step S1: pre-treatment, degreasing, pickling and rust removal, and pre-passivation treatment of aluminum profiles.

[0007] Step S2: turn on the high-temperature heating and curing furnace, the temperature inside the high-temperature heating and curing furnace rises, and the temperature outside the high-temperature heating and curing furnace dissipates, an insulation chamber is set on the outside of the high-temperature heating and curing furnace, an evaporation pool is set at the lower end of the insulation chamber, and an electrostatic powder spraying gun and a workpiece are placed in the insulation chamber. The high-temperature heating and curing furnace transfers heat to the insulation chamber when it works, pure water is placed in the evaporation pool, the outer wall of the high-temperature heating and curing furnace contacts the wall of the evaporation pool, and water vapor circulation holes are evenly set at the upper end of the evaporation pool. A heat transfer element is connected to the electrostatic powder spraying gun, and the heat transfer element is movably connected to the high-temperature heating and curing furnace. The workpiece is set on the other side of the electrostatic powder spraying gun. The high-temperature heating and curing furnace is first turned on to increase the temperature inside the high-temperature heating and curing furnace, and the insulation cotton on one side of the high-temperature heating and curing furnace and the insulation chamber is reduced, so that the temperature inside the high-temperature heating and curing furnace is transferred to the outer wall, thereby raising the temperature inside the insulation chamber, and then the insulation cotton is not set at the connection position between the evaporation pool and the outer wall of the high-temperature heating and curing furnace.

[0008] Step S3: The electrostatic powder spraying gun starts working, and mist spraying is first performed using the electrostatic powder spraying gun;

[0009] Step S4: Primer spraying, after mist spraying is completed, primer spraying is performed;

[0010] Step S5: topcoat spraying, first fix the color, repeat spraying once, and then perform correction spraying;

[0011] Step S6: After spraying, enter the high-temperature heating curing furnace for curing at a temperature of 200°C for 30 minutes;

[0012] Step S7: Cooling: cooling the aluminum profile to room temperature.

[0013] As a preferred embodiment, in step S2, the high-temperature heating and curing furnace works to transfer heat to the heat preservation chamber, pure water is placed in the evaporation pool, the outer wall of the high-temperature heating and curing furnace is in contact with the wall of the evaporation pool, and water vapor circulation holes are evenly arranged at the upper end of the evaporation pool, the electrostatic powder spraying gun is connected to a heat transfer element, the heat transfer element is movably connected to the high-temperature heating and curing furnace, and the workpiece is arranged on the other side of the electrostatic powder spraying gun.

[0014] As a preferred embodiment, in step S3, the temperature in the insulation chamber is controlled at 20°C, and the workpiece is sprayed with a thin and scattered mist. The coating pressure is controlled at 4.0-5.0 Pa, the spraying amount is controlled at 50%, and the electrostatic powder spray gun is 25-30 cm away from the workpiece.

[0015] As a preferred embodiment, after spraying once, check whether there are any shrinkage holes. If there are any, increase the coating pressure to 6.5 Pa for that part and spray to fill the shrinkage holes.

[0016] As a preferred embodiment, in step S4, the primer spraying time is 14-16s, the temperature in the insulation chamber is controlled at 20°C, and the coating pressure is 4.0 Pa.

[0017] As a preferred embodiment, when spraying the topcoat to fix the color in step S5, first spray lightly for 14-16 seconds, then repeat the spraying once, with the same time control of 14-16 seconds. During the correction process, the spraying time is 11-13 seconds, and the temperature in the insulation chamber is 20°C at this time.

[0018] As a preference, in step S6, the film thickness is measured after heating and curing, and the film thickness is not less than 40 μm, and the average film thickness is 60-120 μm. If qualified, the film enters cooling.

[0019] As a preferred embodiment, the temperature in the high-temperature heating and curing furnace in step S2 is controlled at 200°C, an interlayer is provided in the heat preservation chamber, a cooling water circulation pipe is provided in the interlayer, one end of the cooling water circulation pipe is connected to the water inlet, and the other end is connected to the evaporation pool, and a drain outlet is provided at the lower end of the evaporation pool.

[0020] As another preferred embodiment, in step S2, a workpiece is provided on the opposite side of the electrostatic powder spraying gun, and a rotating track is provided on the upper end of the workpiece.

[0021] Beneficial effects of the present invention:

[0022] (1) In the present invention, an evaporation pool is set up, and the heat preheated by the high-temperature heating and curing furnace is used to heat the pure water in the evaporation pool. Because the temperature in the high-temperature heating and curing furnace can reach 200°C, water vapor will be generated in the evaporation pool and dissipated in the heat-insulating chamber. During the powder coating spraying process, water vapor plays an important role in the curing process. Water vapor can help the curing agent to undergo a cross-linking reaction to form a hard coating. Among them, the triglycidyl isocyanurate (TGIC) curing agent reacts with water vapor at high temperature to form a cross-linking network, thereby enhancing the hardness and durability of the coating. An appropriate amount of water vapor can help the coating better adhere to the aluminum alloy surface to form a uniform and smooth coating. The presence of water vapor helps to reduce defects on the coating surface and improve the overall quality of the coating.

[0023] (2) In the present invention, a high-temperature heating and curing furnace is provided and slidingly connected to the electrostatic powder spraying gun through a heat transfer element, so that the heat transfer element transfers the heat dissipated from the outer wall of the high-temperature heating and curing furnace to the electrostatic powder spraying gun. The transferred heat is controlled at 25°C, which is slightly higher than the temperature of the heat preservation chamber. Such an appropriate temperature helps to improve the charging performance of the powder and make the powder particles adhere more evenly to the surface of the sprayed object.

[0024] (3) In the present invention, a cooling water circulation pipe is provided to control the temperature of the entire insulation chamber, and the temperature in the entire insulation chamber is controlled at 20°C, which facilitates the adhesion of electrostatically sprayed powder and ensures that the powder adhesion is more uniform. Then, the insulation chamber covers the entire spraying space to reduce the amount of sprayed powder entering the air and being absorbed by workers, thereby reducing the occurrence of safety hazards.

[0025] In summary, this method utilizes the temperature dissipation of the outer wall of the high-temperature heating and curing furnace to control the temperature and humidity of the insulation chamber, and can also limit the position and control the temperature of the electrostatic powder spraying gun, ensuring the overall good heat conduction effect, high utilization rate, more uniform coating spraying, higher coating hardness, and better durability. It is especially suitable for the field of aluminum alloy coating spraying technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1 It is a schematic diagram of the overall process structure of the present invention.

[0028] Figure 2 This is a schematic diagram of the connection structure of the high-temperature heating and curing furnace in the present invention.

[0029] Figure 3 It is a schematic diagram of the heat conduction flow of the high-temperature heating and curing furnace in the present invention. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the accompanying drawings.

[0031] Example 1

[0032] like Figures 1 to 3 As shown, the present invention provides a new type of coating heat conduction spraying process, including step S1: pre-treatment, degreasing, pickling and rust removal of aluminum profiles, and pre-passivation treatment.

[0033] Step S2: turn on the high-temperature heating and curing furnace, the temperature inside the high-temperature heating and curing furnace rises, and the temperature outside the high-temperature heating and curing furnace dissipates, an insulation chamber is set on the outside of the high-temperature heating and curing furnace, an evaporation pool is set at the lower end of the insulation chamber, and an electrostatic powder spraying gun and a workpiece are placed in the insulation chamber. The high-temperature heating and curing furnace transfers heat to the insulation chamber when it works, pure water is placed in the evaporation pool, the outer wall of the high-temperature heating and curing furnace contacts the wall of the evaporation pool, and water vapor circulation holes are evenly set at the upper end of the evaporation pool. A heat transfer element is connected to the electrostatic powder spraying gun, and the heat transfer element is movably connected to the high-temperature heating and curing furnace. The workpiece is set on the other side of the electrostatic powder spraying gun. The high-temperature heating and curing furnace is first turned on to increase the temperature inside the high-temperature heating and curing furnace, and the insulation cotton on one side of the high-temperature heating and curing furnace and the insulation chamber is reduced, so that the temperature inside the high-temperature heating and curing furnace is transferred to the outer wall, thereby raising the temperature inside the insulation chamber, and then the insulation cotton is not set at the connection position between the evaporation pool and the outer wall of the high-temperature heating and curing furnace.

[0034] Step S3: The electrostatic powder spraying gun starts working, and mist spraying is first performed using the electrostatic powder spraying gun;

[0035] Step S4: Primer spraying, after mist spraying is completed, primer spraying is performed;

[0036] Step S5: topcoat spraying, first fix the color, repeat spraying once, and then perform correction spraying;

[0037] Step S6: After spraying, enter the high-temperature heating curing furnace for curing at a temperature of 200°C for 30 minutes;

[0038] Step S7: Cooling: cooling the aluminum profile to room temperature.

[0039] Furthermore, in step S2, the high-temperature heating and curing furnace works to transfer heat to the heat preservation chamber, pure water is placed in the evaporation pool, the outer wall of the high-temperature heating and curing furnace is in contact with the wall of the evaporation pool, and water vapor flow holes are evenly arranged on the upper end of the evaporation pool. The electrostatic powder spraying gun is connected to the heat transfer element, and the heat transfer element is moved to connect to the high-temperature heating and curing furnace. The workpiece is set on the other side of the electrostatic powder spraying gun. The high-temperature heating and curing furnace is first turned on to increase the internal temperature of the high-temperature heating and curing furnace, and the heat insulation cotton on one side of the high-temperature heating and curing furnace and the heat preservation chamber is reduced, so that the high-temperature heating and curing furnace is heated. The local temperature is transferred to the outer wall to increase the temperature in the insulation chamber. Then, no insulation cotton is set at the connection position between the evaporation pool and the outer wall of the high-temperature heating and curing furnace. While reducing the overall cost, the temperature of the high-temperature heating and curing furnace can be used to heat the evaporation pool, so that the pure water in the evaporation pool is evaporated. There is water vapor in the insulation chamber. The water vapor helps the curing agent to undergo a cross-linking reaction to form a hard coating. The triglycidyl isocyanurate (TGIC) curing agent reacts with water vapor at high temperature to form a cross-linking network, thereby enhancing the hardness and durability of the coating.

[0040] Furthermore, in step S3, the mist spraying process is performed by controlling the temperature in the heat preservation chamber at 20°C, spraying the workpiece with a thin, diffuse mist. The coating pressure is controlled at 4.0-5.0 Pa, the spray volume is controlled at 50%, and the electrostatic powder spray gun is held 25-30 cm away from the workpiece. The purpose of mist spraying is to ensure that the mist spraying, by atomizing the paint into tiny particles, can more evenly cover the surface of the coated object, forming a smooth, delicate coating. This not only improves the product's appearance quality, but also enhances the coating's adhesion and durability.

[0041] The temperature in the insulation chamber is controlled at 20°C because too high or too low a temperature will affect the fluidity and drying speed of the paint.

[0042] Furthermore, after spraying the mist once, confirm whether there are any shrinkage cavities. If so, increase the coating pressure to 6.5 Pa for that area and spray to fill the shrinkage cavities. The paint itself is uneven or contains impurities, which may cause shrinkage cavities; if there is grease, dust or other pollutants on the sprayed surface, it may cause shrinkage cavities; if there are impurities such as dust and oil mist in the spraying environment, they may fall on the wet paint film and cause shrinkage cavities; if the spraying equipment is not thoroughly cleaned, impurities may be brought into the paint, causing shrinkage cavities; the compressed air used contains water or oil, which may be brought into the paint during the spraying process, causing shrinkage cavities; improper settings of parameters such as spraying pressure, distance, and angle may cause uneven distribution of the paint, and then cause shrinkage cavities. Therefore, in order to reduce the impact of shrinkage cavities, it is necessary to increase the coating pressure and spray again. The method is simple and the effect is obvious.

[0043] Furthermore, in step S4, the primer spraying time is 14-16s, the temperature in the insulation chamber is controlled at 20°C, and the coating pressure is 4.0pa. The primer can effectively penetrate the surface of the substrate to form a smooth base layer, thereby enhancing the bonding strength between the topcoat and the substrate. The primer can prevent rust on the metal surface caused by moisture or oxidation, and requires higher control accuracy during the coating process. By spraying the primer, process defects and flaws can be eliminated in advance, thereby reducing the probability of errors in the coating process. The primer can add a thin film to the surface of the substrate, change the color and texture of the substrate surface, and improve the quality and aesthetics of the coating. The thin film formed by the primer on the substrate has good sealing properties, which can effectively seal the pores and tiny cracks of the substrate and prevent the intrusion of moisture and air in the coating. This sealing performance is extremely important, especially when the external environment is humid or changes greatly. Since the primer can improve the adhesion of the topcoat and ensure its uniform coating, the actual consumption of the topcoat is reduced. In some cases, after using primer, the coverage of the topcoat can be increased by 20%-30% or even more, which reduces the cost of the painting project while maintaining the same coverage. The use of primer can enhance the durability of the coating and resist erosion by external environmental factors such as ultraviolet rays, acids and alkalis, thereby extending the service life of the coating.

[0044] Furthermore, in step S5, when spraying the topcoat to set the color, a light spraying time of 14-16 seconds is first applied, followed by a repeat spraying time of the same 14-16 seconds. During the correction process, the spraying time is 11-13 seconds, and the temperature in the insulation chamber is 20°C. The topcoat has better hiding and filling properties, can better cover the pores and burrs of the underlying layer, making the coating surface smoother and flatter, and providing a more perfect coating effect. The topcoat can firmly adhere to the primer surface and combine with the topcoat layer above to ensure the stability and integrity of the paint film. This adhesion helps to improve the vividness and fullness of the entire coating. The topcoat plays a major decorative and protective role in the entire coating, determining the durability and appearance of the coating. By spraying the topcoat, the overall performance and service life of the coating can be significantly improved.

[0045] Furthermore, in step S6, the film thickness is measured after heating and curing. The film thickness is not less than 40 μm, and the average film thickness is 60-120 μm. If qualified, the film enters cooling to ensure that the film thickness of the profile surface after heating and curing meets the national standard.

[0046] Furthermore, in step S2, the temperature in the high-temperature heating and curing furnace is controlled at 200°C, an interlayer is provided in the insulation chamber, a cooling water circulation pipe is provided in the interlayer, one end of the cooling water circulation pipe is connected to the water inlet, and the other end is connected to the evaporation pool, and a drain outlet is provided at the lower end of the evaporation pool. The interlayer in the insulation chamber is just placed on the cooling water circulation pipe, so that the cooling water circulation pipe can be used to control the temperature in the entire insulation chamber, and the evaporation pool can be continuously filled with water to ensure the humidity in the insulation chamber, thereby achieving the effect of controlling the temperature and humidity in the insulation chamber and improving the uniformity and overall quality of adhesion during the powder spraying process.

[0047] Furthermore, in the step S2, a workpiece is provided on the opposite side of the electrostatic powder spraying gun, and a rotating track is provided on the upper end of the workpiece. The setting of the rotating track can not only ensure that the workpiece is more convenient and quick to rotate into the insulation chamber, but also utilize the space where the workpiece enters the insulation chamber to distribute and control the temperature and humidity in the insulation chamber, thereby preventing the temperature and humidity in the insulation chamber from being too high, which is not conducive to powder coating.

[0048] Working process: First, pre-treat the profiles that need to be sprayed. Pre-treatment can remove pollutants such as grease, dirt, oxide film on the surface of the profile to ensure that the coating can firmly adhere to the surface of the profile. Pre-treatment can enhance the bonding force between the coating and the profile surface, improve the adhesion and durability of the coating, and excellent pre-treatment can ensure the uniformity and integrity of the coating, thereby improving the quality and durability of the coating. Pre-treatment can also eliminate surface defects, increase surface flatness, and further improve the effect of the coating. Then enter the electrostatic spraying. First, heat the high-temperature heating and curing furnace to increase the internal temperature of the high-temperature heating and curing furnace. Then the temperature of the high-temperature heating and curing furnace is transmitted to the electrostatic powder spraying gun, the evaporation water pool, and the insulation chamber. The temperature and humidity in the insulation chamber are controlled by the temperature of the high-temperature heating and curing furnace. Then a cooling water circulation pipe is set in the insulation chamber to effectively prevent the temperature in the insulation chamber from being too high and affecting the coating effect of the paint. Then electrostatic spraying is carried out. The high voltage generated by the high-voltage electrostatic generator is applied to the end. Due to corona discharge, dense charges are generated near it. When the powder is sprayed from the nozzle, charged coating particles are formed. Under the action of electrostatic force, it is attracted to the aluminum profile with the opposite polarity. As the amount of powder sprayed increases, the charge accumulates more. When a certain thickness is reached, the electrostatic repulsion effect is generated and the side stops adsorbing, so that the entire aluminum profile obtains a certain thickness of powder coating. Then, the powder coating is melted, leveled, and solidified by heating, that is, a hard coating is formed on the surface of the profile. The workpiece is then placed in a high-temperature heating and curing furnace for heating and curing. It is cured at a temperature of 200°C for 30 minutes. After the coating is cured, it is placed at room temperature for cooling. The entire process uses the heat of the high-temperature curing furnace for conduction to control the temperature and humidity inside the insulation chamber. Then, the evaporation pool is filled with water through the cooling water circulation pipe that controls the temperature of the insulation chamber to ensure good overall linkage, effective heat transfer, resource saving, and cost saving.

[0049] In the description of the present invention, it should be understood that the terms "front and back", "left and right", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the equipment or components referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the invention.

[0050] Of course, in this technical solution, those skilled in the art should understand that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0051] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art based on the technical guidance of the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A new type of coating heat conduction spraying process, characterized by: include Step S1: Pre-treatment, degreasing, pickling and rust removal, and pre-passivation treatment of the aluminum profile; Step S2: turning on the high-temperature heating and curing furnace, the temperature inside the high-temperature heating and curing furnace rises, and the temperature outside the high-temperature heating and curing furnace dissipates, an insulation chamber is provided on the outside of the high-temperature heating and curing furnace, an evaporation water pool is provided at the lower end of the insulation chamber, and an electrostatic powder spraying gun and a workpiece are placed in the insulation chamber, the high-temperature heating and curing furnace transfers heat to the insulation chamber when it is working, pure water is placed in the evaporation water pool, the outer wall of the high-temperature heating and curing furnace contacts the wall of the evaporation water pool, and water vapor circulation holes are evenly provided at the upper end of the evaporation water pool, a heat transfer element is connected to the electrostatic powder spraying gun, the heat transfer element is movably connected to the high-temperature heating and curing furnace, the workpiece is arranged on the other side of the electrostatic powder spraying gun, the high-temperature heating and curing furnace is first turned on, so that the temperature inside the high-temperature heating and curing furnace rises, the heat insulation cotton on one side of the high-temperature heating and curing furnace and the insulation chamber is reduced, so that the temperature inside the high-temperature heating and curing furnace is transferred to the outer wall, thereby heating the temperature inside the insulation chamber, and then the heat insulation cotton is not provided at the connection position between the evaporation water pool and the outer wall of the high-temperature heating and curing furnace; Step S3: The electrostatic powder spraying gun starts working, and mist spraying is first performed using the electrostatic powder spraying gun; Step S4: Primer spraying: After mist spraying is completed, primer spraying is performed; Step S5: topcoat spraying, first fix the color, repeat spraying once, and then perform correction spraying; Step S6: After spraying, enter the high-temperature heating curing furnace for curing at a temperature of 200°C for 30 minutes; Step S7: Cooling: cooling the aluminum profile to room temperature.

2. A new type of coating heat conduction spraying process according to claim 1, characterized in that: In step S2, the high-temperature heating and curing furnace works to transfer heat to the heat-insulating chamber, pure water is placed in the evaporation pool, the outer wall of the high-temperature heating and curing furnace is in contact with the wall of the evaporation pool, and water vapor circulation holes are evenly arranged at the upper end of the evaporation pool. The electrostatic powder spraying gun is connected to a heat transfer element, which is movably connected to the high-temperature heating and curing furnace, and the workpiece is arranged on the other side of the electrostatic powder spraying gun.

3. A new type of coating heat conduction spraying process according to claim 1, characterized in that: In step S3, the mist spraying is to control the temperature in the heat preservation chamber at 20° C., spray the workpiece in a scattered and thin manner, control the coating pressure at 4.0-5.0 Pa, control the spraying amount at 50%, and keep the electrostatic powder spray gun 25-30 cm away from the workpiece.

4. A new type of coating heat conduction spraying process according to claim 3, characterized in that: After spraying once, check whether there are any shrinkage holes. If so, increase the coating pressure to 6.5 Pa and spray to fill the shrinkage holes.

5. A new type of coating heat conduction spraying process according to claim 1, characterized in that: In step S4, the primer spraying time is 14-16 seconds, the temperature in the heat preservation chamber is controlled at 20° C., and the coating pressure is 4.0 Pa.

6. A novel coating heat conduction spraying process according to claim 1, characterized in that: In step S5, when spraying the topcoat to fix the color, first spray lightly for 14-16 seconds, then repeat the spraying once, with the same time control of 14-16 seconds. During the correction process, the spraying time is 11-13 seconds, and the temperature in the insulation chamber is 20°C at this time.

7. A new type of coating heat conduction spraying process according to claim 1, characterized in that: In the step S6 , the film thickness is measured after heating and curing. The film thickness is not less than 40 μm, and the average film thickness is 60-120 μm. If it is qualified, the film enters cooling.

8. The spraying process of a novel coating heat conduction according to claim 1 is characterized in that: In step S2, the temperature in the high-temperature heating and curing furnace is controlled at 200° C., an interlayer is provided in the heat preservation chamber, a cooling water circulation pipe is provided in the interlayer, one end of the cooling water circulation pipe is connected to the water inlet, and the other end is connected to the evaporation pool, and a drain outlet is provided at the lower end of the evaporation pool.

9. A novel coating heat conduction spraying process according to claim 1, characterized in that: In the step S2, a workpiece is provided on the opposite side of the electrostatic powder spraying gun, and a rotating track is provided on the upper end of the workpiece.

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