Efficient surface treatment method for plastic gasket

Abstract

The invention provides an efficient surface treatment method for plastic gaskets, which comprises the following steps: S1, pretreatment: putting a plurality of groups of plastic gaskets into a tool basket, and sequentially carrying out ultrasonic degreasing by an ultrasonic cleaning machine, deionized water spraying washing by a spraying cleaning machine and vacuum drying by a vacuum drying oven; s2, plasma activation is conducted, specifically, the gasket is placed on a rotary carrying table of rotary plasma treatment equipment along with the tool basket, a plasma treatment cavity is vacuumized to 5-15 Pa, then treatment gas is introduced, a plasma generator is started, and the rotary carrying table drives the gasket to rotate at a constant speed during treatment; s3, functional coating coating is conducted, specifically, the activated gaskets are taken out and arranged to an ultrasonic atomization and electrostatic spraying all-in-one machine, and modified coating is coated; and S4, composite curing: pre-curing the coated gasket through an infrared pre-curing oven, and then transferring the gasket into an ultraviolet pre-curing oven for ultraviolet curing to obtain a finished product. According to the method, the treatment efficiency and uniformity are improved, and the coating adhesive force and the gasket performance are enhanced.

Description

Technical Field

[0001] This invention relates to the field of plastic gasket processing technology, and more specifically, to a high-efficiency surface treatment method for plastic gaskets. Background Technology

[0002] Plastic gaskets are widely used in industrial fields such as mechanical seals, electronic insulation, and pipe connections due to their advantages of lightweight, chemical corrosion resistance, and low cost. However, to ensure the sealing reliability, surface coating adhesion, wear resistance, and compatibility with contact surfaces of plastic gaskets, and to avoid problems such as sealing failure and coating peeling caused by surface oil, mold release agent residue, or low surface energy, surface treatment of plastic gaskets is necessary. However, traditional plastic gasket surface treatment methods often adopt a step-by-step operation mode of "single solvent immersion degreasing - natural drying - atmospheric pressure plasma activation - manual brush coating - oven curing". This results in the reliance on static immersion degreasing in the pretreatment stage, which is incomplete and time-consuming in removing contaminants such as oil and mold release agents. The subsequent natural drying is prone to secondary contamination. At the same time, plasma activation is mostly a fixed treatment, which can easily cause uneven activation of the gasket surface, requiring multiple batches of operation. Furthermore, the coating is applied manually or by simple spraying, resulting in low paint utilization and poor coating thickness consistency. Summary of the Invention

[0003] In view of the aforementioned problems, and in conjunction with the first aspect of the present invention, embodiments of the present invention provide a high-efficiency surface treatment method for plastic gaskets, the method comprising: A high-efficiency surface treatment method for plastic gaskets includes the following steps: S1: Pre-treat the plastic gaskets by placing multiple sets of plastic gaskets into a tooling basket, and then passing the tooling basket through an ultrasonic cleaner, a spray cleaner, and a vacuum drying oven in sequence for ultrasonic degreasing, deionized water spray rinsing, and vacuum drying. S2: The pretreated plastic gasket is subjected to plasma activation treatment. The pretreated plastic gasket is placed on the rotating platform inside the rotary plasma treatment equipment along with the tooling basket. The rotary plasma treatment equipment is equipped with a plasma treatment chamber, and the tooling basket is located inside the plasma treatment chamber. First, the plasma treatment chamber is evacuated to 5Pa-15Pa, and then treatment gas is introduced into the plasma treatment chamber. The plasma generator inside the rotary plasma treatment equipment is started. During the treatment process, the gasket is rotated at a constant speed by the rotating platform. S3: The plastic gasket after plasma activation treatment is coated with a functional coating. The plastic gasket is taken out from the tooling basket and arranged in an ultrasonic atomizing electrostatic spraying machine. The modified coating is applied to the surface of the activated plastic gasket through the ultrasonic atomizing electrostatic spraying machine. S4: Perform a composite curing operation on the coated plastic gasket. Place the coated plastic gasket in an infrared pre-curing oven for pre-curing, and then transfer it to an ultraviolet pre-curing oven for curing by ultraviolet light. After curing, the plastic gasket with the final surface treatment is obtained.

[0004] According to a preferred embodiment, the tooling basket includes a main frame and multiple sets of placement plates. The multiple sets of placement plates are arranged longitudinally and locked within the main frame. Multiple sets of support legs are provided at the bottom of each placement plate. Multiple sets of mounting sleeves are provided within both the placement plates and the main frame. The support legs on the placement plates are locked within the mounting sleeves on adjacent placement plates, and a placement space is formed between the placement plates and adjacent placement plates. The support legs on one set of placement plates are locked within the mounting sleeves on the main frame.

[0005] According to a preferred embodiment, the top of the placement plate is provided with multiple sets of first partitions and multiple sets of second partitions, the first partitions and the second partitions intersecting perpendicularly to form multiple placement grids, and plastic pads are placed in the placement grids.

[0006] According to a preferred embodiment, the ultrasonic cleaner is filled with a cleaning fluid, and the plastic gasket is immersed in the cleaning fluid. The cleaning fluid is a mixed solvent of ethanol and isopropanol, with a mixing volume ratio of 2:1 to 3:1.

[0007] According to a preferred embodiment, after ultrasonic degreasing, the plastic gasket is subjected to an alkaline washing operation. The plastic gasket is immersed in a sodium carbonate solution and soaked at 40℃-50℃ for 5min-8min. After the alkaline washing operation, it enters the spray cleaning machine for deionized water spray rinsing.

[0008] According to a preferred embodiment, the total flow rate of the processing gas is 20 sccm-40 sccm, and the processing gas is a mixture of argon, oxygen and carbon dioxide, with a flow ratio of 4:1:0.5 to 5:1:1; the rotary plasma processing equipment is equipped with a detachable multi-directional nozzle, which is located inside the plasma processing chamber.

[0009] According to a preferred embodiment, the modified coating is composed of a base material, nano-reinforcing particles, and a dispersant. The spraying distance between the nozzle and the plastic pad inside the ultrasonic atomizing electrostatic spraying machine is 18cm-22cm; the spraying pressure is 0.3MPa-0.4MPa; and the ultrasonic atomization frequency is 1.5MHz-2MHz.

[0010] According to a preferred embodiment, the base material is a compound system of epoxy resin and polyamide, wherein the mass ratio of epoxy resin to polyamide is 3:1 to 4:1; the nano-reinforcing particles are compound particles of silicon carbide and titanium dioxide, and their mass percentage is 8%-15% of the total mass of the coating; the dispersant is modified polycarboxylate, and its mass percentage is 1.5%-3% of the total mass of the coating.

[0011] According to a preferred embodiment, the plastic gasket after composite curing is placed in a forced-air drying oven and kept at 60℃-70℃ for 1 hour, followed by surface polishing to obtain the final surface-treated plastic gasket.

[0012] Compared with the prior art, the present invention has the following beneficial effects: 1. This method constructs a highly efficient processing system through process optimization and equipment collaboration. In the pretreatment stage, ultrasonic degreasing replaces static soaking, leveraging the ultrasonic cavitation effect to enhance contaminant removal. Combined with subsequent spray rinsing and vacuum drying, this significantly shortens degreasing and drying time, and the vacuum environment avoids secondary contamination caused by natural air drying. Plasma activation employs a combination of a rotating stage and multi-directional nozzles. The gaskets rotate at a constant speed with the stage, ensuring full contact with the plasma and achieving omnidirectional, uniform activation. This eliminates the need for multiple batches and significantly increases the throughput per batch. Coating is applied using an integrated ultrasonic atomization electrostatic spraying machine. After atomization, the coating adheres precisely to the gasket surface via electrostatic adsorption. Compared to manual brushing or simple spraying, this not only reduces paint waste but also enables automated continuous coating. Simultaneously, the modular design of the tooling basket allows for centralized transfer and simultaneous processing of multiple gaskets, reducing material transfer time between processes. The overall processing flow is highly consistent and automated, making it highly adaptable to industrial mass production scenarios.

[0013] 2. The combined process of ultrasonic degreasing and alkaline washing in the pretreatment can thoroughly remove stubborn contaminants such as oil and release agents from the gasket surface, laying a clean base for subsequent treatment; plasma activation introduces a multi-component mixed gas in a vacuum environment, which can introduce more active functional groups on the gasket surface, significantly improving surface wettability and activity, providing a good foundation for coating adhesion, and the use of a rotating stage ensures uniform activation and avoids the problem of insufficient local coating adhesion.

[0014] 3. The coating uses a modified coating with a specific ratio. The composite system of the base material and nano-reinforcing particles enhances the mechanical properties and corrosion resistance of the coating. Combined with the fine coating particles formed by ultrasonic atomization, a uniform and dense coating can be formed on the gasket surface. Subsequent composite curing, through the synergistic effect of infrared pre-curing and ultraviolet curing, promotes the full cross-linking and molding of the coating. After heat preservation stabilization and wool wheel polishing, internal stress in the coating is further eliminated and surface smoothness is improved. Ultimately, the plastic gasket has excellent sealing reliability, wear resistance, and coating adhesion, significantly enhancing its performance and service life in various application scenarios. Attached Figure Description

[0015] Figure 1 This is a flowchart of an apparatus for a high-efficiency surface treatment method for plastic gaskets; Figure 2 This is a flowchart illustrating the steps of an efficient surface treatment method for plastic gaskets. Figure 3 This is a structural diagram of the work basket; Figure 4 This is a structural diagram of the disassembled work basket; Figure 5 yes Figure 4 A magnified view of a portion of region a.

[0016] In the diagram, the correspondence between component names and their corresponding reference numerals is as follows: 11. Ultrasonic cleaning machine; 12. Spray cleaning machine; 13. Vacuum drying oven; 14. Rotary plasma treatment equipment; 15. Ultrasonic atomization electrostatic spraying integrated machine; 16. Infrared pre-curing oven; 17. Ultraviolet pre-curing oven; 18. Blower-air drying oven; 21. Main frame; 22. Placement plate; 23. Support leg; 24. Mounting sleeve; 25. First partition; 26. Second partition. Detailed Implementation

[0017] The present invention will now be described in detail with reference to the accompanying drawings; like Figures 1 to 5 As shown, the present invention provides a high-efficiency surface treatment method for plastic gaskets, comprising the following steps: S1: Pre-treat the plastic gaskets by placing multiple sets of plastic gaskets into a tooling basket. The tooling basket allows for centralized storage and transportation of multiple sets of gaskets, reducing the tediousness of handling individual gaskets. The tooling basket is then sequentially passed through an ultrasonic cleaner 11, a spray cleaner 12, and a vacuum drying oven 13 for ultrasonic degreasing, deionized water spray rinsing, and vacuum drying, respectively. The ultrasonic cleaner 11 uses ultrasonic vibration to enhance the removal effect of the cleaning solution on oil and mold release agent on the gasket surface; the spray cleaner 12 uses high-pressure water jets to remove residual cleaning solution and impurities from the gasket surface; and the vacuum drying oven 13 accelerates moisture evaporation by reducing the internal air pressure, quickly drying the gasket surface.

[0018] S2: The pretreated plastic gasket is subjected to plasma activation treatment. The pretreated plastic gasket, along with the tooling basket, is placed on the rotating platform inside the rotary plasma treatment equipment 14. The rotating platform drives the tooling basket and the internal gasket to rotate at a uniform speed, ensuring that all surfaces of the gasket can contact the plasma. The rotary plasma treatment equipment 14 is equipped with a plasma treatment chamber, and the tooling basket is located inside the plasma treatment chamber. The plasma treatment chamber provides a closed space for the activation process, facilitating the control of gas pressure and gas environment. First, the plasma treatment chamber is evacuated to 5Pa-15Pa to create a low-pressure environment to enhance plasma activity; then, treatment gas is introduced into the plasma treatment chamber to provide a medium for the plasma reaction; the plasma generator inside the rotary plasma treatment equipment 14 is started, and the plasma generated by the plasma generator can bombard the surface of the gasket, introducing active functional groups; during the treatment process, the rotating platform keeps the gasket rotating at a uniform speed to ensure uniform activation.

[0019] S3: The plasma-activated plastic gaskets are coated with a functional coating. The plastic gaskets are removed from the tooling basket and arranged in an orderly manner within the ultrasonic atomizing electrostatic spraying machine 15 to avoid obstruction during spraying. The modified coating is applied to the surface of the activated plastic gaskets using the ultrasonic atomizing electrostatic spraying machine 15. This equipment combines coating atomization and electrostatic adsorption, improving coating adhesion. Before coating, the modified coating is ultrasonically dispersed at a frequency of 20kHz-30kHz for 20-30 minutes to break up the agglomeration of the nano-reinforced particles. During spraying, ultrasonic stirring is maintained in the coating tank at a frequency of 5kHz-10kHz to maintain the uniformity of the coating system and prevent particle sedimentation.

[0020] S4: Perform a composite curing operation on the coated plastic gasket. Place the coated plastic gasket in an infrared pre-curing oven 16 for pre-curing. The infrared pre-curing oven 16 heats the gasket with infrared radiation to promote the initial shaping of the coating and reduce defects during subsequent curing. Then transfer it to an ultraviolet pre-curing oven 17 for curing with ultraviolet light. Ultraviolet light can stimulate the coating components to undergo a cross-linking reaction, enhancing the adhesion between the coating and the gasket. After curing, a plastic gasket with preliminary surface treatment is obtained.

[0021] like Figures 3 to 5 As shown, the tooling basket includes a main frame 21 and multiple sets of placement plates 22. The main frame 21 provides support for the entire tooling basket, ensuring structural stability. The multiple sets of placement plates 22 are arranged longitudinally and secured within the main frame 21, and are used to support plastic gaskets. Multiple sets of support legs 23 are provided at the bottom of the placement plates 22, allowing gaps to form between adjacent placement plates 22. Multiple sets of mounting sleeves 24 are provided within both the placement plates 22 and the main frame 21, providing positioning and fixing positions for the support legs 23. The support legs 23 on the placement plates 22 are secured within the mounting sleeves 24 on adjacent placement plates 22. Through the cooperation of the support legs 23 and the mounting sleeves 24, the multiple sets of placement plates 22 are stacked longitudinally. A placement space is formed between the placement plates 22 and adjacent placement plates 22 to accommodate the plastic gaskets and prevent them from contacting each other. One of the support legs 23 on the placement plate 22 is locked in the mounting sleeve 24 on the main frame 21, so that the bottom placement plate 22 is stably connected to the main frame 21.

[0022] like Figure 1 , Figure 2 As shown, the top of the placement plate 22 is provided with multiple sets of first partitions 25 and multiple sets of second partitions 26. The first partitions 25 and second partitions 26 can divide the surface of the placement plate 22 into areas. The first partitions 25 and second partitions 26 intersect perpendicularly to form multiple placement grids. The placement grids can limit the position of a single plastic pad to prevent the pad from shifting or colliding during transportation and processing. The plastic pad is placed in the placement grid to ensure that the pad maintains a relatively fixed position in each process.

[0023] The ultrasonic cleaner 11 is filled with a cleaning solution that dissolves and removes oil, mold release agents, and other contaminants from the surface of the plastic gasket. The plastic gasket is immersed in the cleaning solution, ensuring full contact between the gasket surface and the solution, thus improving the degreasing effect. The cleaning solution is a mixed solvent of ethanol and isopropanol in a volume ratio of 2:1 to 3:1. This mixed solvent has good dissolving power for common oil stains and mold release agents, and its moderate volatility facilitates subsequent cleaning and removal.

[0024] After ultrasonic degreasing, the plastic gaskets undergo alkaline washing to further remove stubborn oil stains, especially grease-based contaminants, remaining after ultrasonic degreasing. The gaskets are then immersed in a sodium carbonate solution, which, being alkaline, reacts with the oil stains through saponification, enhancing the cleaning effect. Immersion at 40℃-50℃ for 5-8 minutes provides a suitable balance between cleaning efficiency and gasket material protection. Following alkaline washing, the gaskets are rinsed with deionized water in a spray cleaning machine 12 to remove residual sodium carbonate solution and reaction products from the surface, preventing chemical residues from affecting subsequent treatments.

[0025] The total flow rate of the processing gas is 20 sccm-40 sccm. This flow rate range ensures a stable gas environment within the plasma processing chamber, providing sufficient medium for the plasma reaction. The processing gas is a mixture of argon, oxygen, and carbon dioxide, with a flow ratio of 4:1:0.5 to 5:1:1. Argon enhances the bombardment effect of the plasma, oxygen introduces oxygen-containing functional groups, and carbon dioxide regulates plasma activity. The three work synergistically to improve the surface activation effect of the gasket. The rotary plasma processing device 14 is equipped with a detachable multi-directional nozzle located within the plasma processing chamber. The multi-directional nozzle can evenly deliver the processing gas to all areas of the plasma processing chamber. Combined with the rotating stage, this further improves the uniformity of gas distribution, and the detachable design facilitates cleaning and maintenance of the nozzle.

[0026] Modified coatings consist of a base material, nano-reinforcing particles, and a dispersant. The base material provides the basic structure and adhesion of the coating, while the nano-reinforcing particles improve the mechanical properties and corrosion resistance of the coating. The dispersant prevents the nanoparticles from agglomerating, ensuring the uniformity of the coating. The ultrasonic atomizing electrostatic spraying machine 15 has a spraying distance of 18cm-22cm between the nozzle and the plastic gasket, which balances the atomization effect and adhesion efficiency of the coating. The spraying pressure is 0.3MPa-0.4MPa, which ensures stable delivery of the coating and forms a uniform spray. The ultrasonic atomization frequency is 1.5MHz-2MHz, which atomizes the coating into fine particles, facilitating the formation of a uniform coating.

[0027] The base material is a blend of epoxy resin and polyamide resin. Epoxy resin exhibits excellent adhesion and chemical resistance, while polyamide resin enhances the coating's flexibility. This blend balances both adhesion and toughness. The mass ratio of epoxy resin to polyamide resin is 3:1 to 4:1, allowing both resins to perform optimally. The nano-reinforcing particles are a blend of silicon carbide and titanium dioxide. Silicon carbide enhances the coating's abrasion resistance, while titanium dioxide improves its weather resistance and antibacterial properties. This nano-reinforcing particle accounts for 8%-15% of the total coating mass, a proportion that enhances coating performance while preventing excessive particles from negatively impacting flowability and adhesion. The dispersant is a modified polycarboxylate, accounting for 1.5%-3% of the total coating mass. The modified polycarboxylate disperses the nanoparticles through electrostatic repulsion, preventing agglomeration and ensuring the stability of the coating system.

[0028] The composite-cured plastic gasket is placed in a forced-air drying oven 18, which achieves uniform temperature distribution through hot air circulation. Holding at 60℃-70℃ for 1 hour slowly releases internal stress in the coating, reducing the risk of cracking. Subsequently, surface polishing is performed to remove minor imperfections and protrusions on the coating surface, resulting in the final surface-treated plastic gasket. During the composite curing process, infrared pre-curing employs a segmented heating mode: first, the temperature is increased to 80℃ at a rate of 5℃ / min and held for 10 minutes to allow the coating to slowly heat and initially set; then, the temperature is increased to the target temperature at a rate of 3℃ / min to avoid sudden temperature increases that could cause bubbles or cracking. During UV curing, a conveyor belt transports the gasket, moving it at a uniform speed through the UV irradiation area. The conveyor speed is matched to the curing time, ensuring that all parts of the gasket surface receive sufficient UV irradiation for uniform curing.

[0029] The polishing process uses a wool wheel, which is soft and can remove surface imperfections while avoiding scratches on the coating. The speed is 800r / min-1000r / min, which balances polishing efficiency and surface protection. The polishing time is 1min-2min, which can improve the surface smoothness while avoiding over-polishing and damaging the coating.

[0030] The plastic gaskets are made of one of the following materials: nylon 66, polytetrafluoroethylene (PTFE), or polyphenylene sulfide (PPS). Different materials have different surface characteristics, requiring targeted adjustments to the activation parameters. Before plasma activation, gas flow ratios are set for different gasket materials. For PTFE, the flow ratio of argon, oxygen, and carbon dioxide is 5:1:1, as a higher proportion of argon enhances the plasma's bombardment effect on the inert PTFE surface. For nylon 66, the flow ratio is 4:1:0.5, tailored to its surface characteristics to introduce suitable active functional groups.

[0031] The method has a processing efficiency of 300-500 plastic gaskets per hour, demonstrating its advantage in batch processing and meeting the needs of industrial production. After treatment, the water contact angle on the gasket surface is ≤30°, indicating good surface wettability, which is beneficial for coating adhesion. The coating adhesion reaches Grade 1 as specified in GB / T9286-1998, indicating a strong bond between the coating and the gasket surface. After 1000 friction cycles, the coating's abrasion resistance shows a weight loss of ≤0.5mg, demonstrating good abrasion resistance and the ability to extend the service life of the plastic gaskets.

[0032] It should be noted that, in order to simplify the description of the present invention and thus help to understand one or more embodiments of the invention, multiple features may sometimes be grouped into one embodiment, drawing or description thereof in the foregoing description of the embodiments of the present invention.

Claims

1. A high-efficiency surface treatment method for plastic gaskets, characterized in that, Includes the following steps: S1: Pre-treat the plastic gaskets, place multiple sets of plastic gaskets into the tooling basket, and then pass the tooling basket through the ultrasonic cleaner (11), the spray cleaner (12), and the vacuum drying oven (13) in sequence to perform ultrasonic degreasing, deionized water spray rinsing, and vacuum drying treatment respectively. S2: Plasma activation treatment is performed on the pretreated plastic gasket. The pretreated plastic gasket is placed on the rotating platform in the rotary plasma treatment equipment (14) along with the tooling basket. The rotary plasma treatment equipment (14) is equipped with a plasma treatment chamber, and the tooling basket is located in the plasma treatment chamber. First, the plasma treatment chamber is evacuated to 5Pa-15Pa, and then the treatment gas is introduced into the plasma treatment chamber. The plasma generator in the rotary plasma treatment equipment (14) is started. During the treatment process, the gasket is rotated at a constant speed by rotating the platform. S3: The plastic gasket after plasma activation treatment is coated with a functional coating. The plastic gasket is taken out from the tooling basket and placed in the ultrasonic atomizing electrostatic spraying machine (15). The modified coating is applied to the surface of the activated plastic gasket through the ultrasonic atomizing electrostatic spraying machine (15). S4: Perform composite curing operation on the coated plastic gasket. Place the coated plastic gasket in an infrared pre-curing oven (16) for pre-curing, and then transfer it into an ultraviolet pre-curing oven (17) for curing by ultraviolet light. After curing, the plastic gasket with the final surface treatment is obtained.

2. The high-efficiency surface treatment method for plastic gaskets according to claim 1, characterized in that: The work basket includes a main frame (21) and multiple sets of placement plates (22). The multiple sets of placement plates (22) are arranged longitudinally and locked in the main frame (21). Multiple sets of support legs (23) are provided at the bottom of the placement plates (22). Multiple sets of mounting sleeves (24) are provided in both the placement plates (22) and the main frame (21). The support legs (23) on the placement plates (22) are locked in the mounting sleeves (24) on the adjacent placement plates (22). A placement space is formed between the placement plates (22) and the adjacent placement plates (22). The support legs (23) on one set of placement plates (22) are locked in the mounting sleeves (24) on the main frame (21).

3. The high-efficiency surface treatment method for plastic gaskets according to claim 2, characterized in that: The top of the placement plate (22) is provided with multiple sets of first partitions (25) and multiple sets of second partitions (26). The first partitions (25) and the second partitions (26) intersect vertically to form multiple placement grids, and plastic pads are placed in the placement grids.

4. The high-efficiency surface treatment method for plastic gaskets according to claim 1, characterized in that: The ultrasonic cleaner (11) is filled with cleaning fluid, and the plastic gasket is immersed in the cleaning fluid. The cleaning fluid is a mixed solvent of ethanol and isopropanol with a volume ratio of 2:1 to 3:

1.

5. The high-efficiency surface treatment method for plastic gaskets according to claim 4, characterized in that: After ultrasonic degreasing, the plastic gasket is subjected to alkaline washing. The plastic gasket is immersed in sodium carbonate solution and soaked at 40℃-50℃ for 5min-8min. After the alkaline washing, it is rinsed with ionized water in the spray cleaning machine (12).

6. The efficient surface treatment method for plastic gaskets according to claim 1, characterized in that: The total flow rate of the processing gas is 20 sccm-40 sccm. The processing gas is a mixture of argon, oxygen and carbon dioxide, and the flow ratio of the three is 4:1:0.5 to 5:1:

1. The rotary plasma processing equipment (14) is equipped with a detachable multi-directional nozzle, which is located in the plasma processing chamber.

7. The efficient surface treatment method for plastic gaskets according to claim 1, characterized in that: The modified coating is composed of a base material, nano-reinforcing particles and a dispersant. The spraying distance between the nozzle and the plastic pad inside the ultrasonic atomizing electrostatic spraying machine (15) is 18cm-22cm; the spraying pressure is 0.3MPa-0.4MPa and the ultrasonic atomization frequency is 1.5MHz-2MHz.

8. The high-efficiency surface treatment method for plastic gaskets according to claim 7, characterized in that: The base material is a compound system of epoxy resin and polyamide, and the mass ratio of epoxy resin to polyamide is 3:1 to 4:1; the nano-reinforcing particles are compound particles of silicon carbide and titanium dioxide, and their mass proportion is 8%-15% of the total mass of the coating; the dispersant is modified polycarboxylate, and its mass proportion is 1.5%-3% of the total mass of the coating.

9. The efficient surface treatment method for plastic gaskets according to claim 1, characterized in that: The plastic gasket after composite curing was placed in a forced-air drying oven (18) and kept at 60℃-70℃ for 1 hour. Then, the surface was polished to obtain the final surface-treated plastic gasket.

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