Switch panel spraying process for improving skin feeling, water resistance, damp heat resistance and weather resistance

Abstract

The invention discloses a switch panel spraying process for improving skin feeling, water resistance, damp heat resistance and weather resistance. The switch panel spraying process comprises the following steps that S1, surface cleaning is conducted on a plastic switch panel; s2, spraying the front surface of the cleaned switch panel for multiple times; s3, performing laser etching treatment on the front surface of the switch panel to obtain corresponding characters; s4, spraying the UV matte varnish on the front surface of the switch panel again; wherein in the step S2, curing is carried out after each time of spraying, and then the next time of spraying is carried out. By spraying the switch panel for multiple times, the spraying thickness on the switch panel can meet the corresponding requirement, and curing treatment is carried out after each time of spraying, so that the oil accumulation phenomenon during spraying is avoided, and the uniformity and smoothness of a spraying layer are greatly improved; the water resistance, the heat and humidity resistance, the weather resistance and the heat and humidity resistance of the surface of the switch panel are greatly improved, the application scene of the switch panel is increased, and the service life of the switch panel is prolonged.

Description

Technical Field

[0001] This invention belongs to the field of plastic panel spraying technology, and in particular relates to a spraying process for switch panels that improves skin feel and resistance to water, damp heat and weathering. Background Technology

[0002] After injection molding, the switch panel is coated with white ink and then laser-engraved with text to obtain the switch panel. However, existing switch panels are prone to issues with excessive or insufficient coating thickness during the coating process. When the coating thickness is too thin, it fails to meet requirements, resulting in a substandard product. Conversely, excessive coating can lead to oil accumulation and uneven surface finish. Furthermore, the lettering on many existing switch panels is susceptible to coating peeling in humid or moisture-containing environments, such as factories, affecting their lifespan. Summary of the Invention

[0003] The purpose of this invention is to provide a switch panel spraying process that can solve at least one of the above problems and improve skin feel, water resistance, damp heat resistance and weather resistance.

[0004] According to one aspect of the present invention, a coating process for switch panels that improves skin feel and resistance to water, damp heat, and weathering is provided, comprising the following steps: S1. Clean the surface of the plastic switch panel; S2. Apply multiple coats of paint to the front of the cleaned switch panel; S3. Laser engrave the front of the switch panel to obtain the corresponding text; S4. Apply UV matte paint to the front of the switch panel again; In step S2, each spraying is cured before the next spraying is performed.

[0005] In some implementations, multiple spraying processes are performed in step S2, as detailed below: S201. Spray an insulating gray ink and cure it. S202, then spray the second layer of insulating gray ink, and then cure it; S203, spray white ink and cure; S204, apply white ink twice and cure; S205, apply three coats of white ink and cure; S206, apply four coats of white ink and then cure.

[0006] In some embodiments, 10% of the corresponding ink weight of curing agent is added to each sprayed ink in step S2.

[0007] In some implementations, the cleaning in step S1 is performed using plasma cleaning, and after cleaning, the dyne value of the front of the switch panel is ≥50.

[0008] In some embodiments, the curing temperature in steps S201 to S205 is 48 to 55°C and the curing time is 20 to 25 minutes, and the curing temperature in step S206 is 48 to 55°C and the curing time is 38 to 45 minutes.

[0009] In some embodiments, after spraying the UV matte varnish in step S4, the ink is heated at an energy range of 800~900mJ / cm. 2 Cured under ultraviolet light.

[0010] In some embodiments, the UV matte oil in step S4 comprises the following components in parts by weight: 30-45 parts acrylic resin, 20-35 parts polyurethane acrylic resin, 2-5 parts initiator, 1-2 parts leveling agent, 1-2 parts additives, 20-25 parts butyl acetate, and 5-8 parts silica.

[0011] The beneficial effects of this invention are: 1. By spraying the switch panel multiple times, the coating thickness on the switch panel can meet the corresponding requirements. Moreover, a curing treatment is performed after each spraying to avoid oil accumulation during spraying, which greatly improves the uniformity and smoothness of the coating layer. 2. Multiple coats of insulating gray ink and white ink improve adhesion to the switch panel. 3. Through multiple spraying and curing processes in step S2, the water resistance, damp heat resistance, weather resistance, and damp heat resistance of the switch panel surface are greatly improved, which helps to increase the applicable scenarios of the switch panel and improve its service life. 4. The switch panel obtained by this spraying process has a significantly improved surface flatness, achieving a skin-like effect, and a surface roughness Ra≤1.2μm; 5. Perform plasma cleaning on the switch panel before spraying to improve the adhesion of ink during subsequent spraying. 6. Through the various components of UV matte oil, the switch panel can have a better skin feel after spraying, and it also provides excellent protection for the entire coating. Detailed Implementation

[0013] The present invention will now be described in further detail.

[0014] The present invention provides a switch panel spraying process that improves skin feel and resistance to water, damp heat, and weathering, comprising the following steps: S1. Clean the surface of the plastic switch panel; S2. Apply multiple coats of paint to the front of the cleaned switch panel; S3. Laser engraving is performed on the front of the switch panel to obtain the corresponding text; through laser engraving, the text on the front of the switch panel is engraved to obtain translucent fonts, so that light can pass through the fonts to meet the corresponding usage requirements. S4. Apply UV matte paint to the front of the switch panel again; the UV matte paint used is UV5510-37 from Zhejiang Youqian Special Materials Co., Ltd., which can protect the surface of the switch panel and improve the feel.

[0015] In step S2, each spraying is cured before the next spraying is performed.

[0016] After the switch panel is injection molded, it is transferred to the cleaning process. The front of the switch panel is plasma cleaned by placing the switch panel at the atmospheric cyclone plasma machine. The height distance between the ion gun and the front of the switch panel is 8~12mm. After cleaning, the dyne value of the front of the switch panel is ≥50, which facilitates the improvement of the adhesion of subsequent ink spraying.

[0017] Step S2 involves multiple spraying processes, with the specific steps as follows: S201. Spray an insulating gray ink and cure it. S202, then spray the second layer of insulating gray ink, and then cure it; S203, spray white ink and cure; S204, apply white ink twice and cure; S205, apply three coats of white ink and cure; S206, apply four coats of white ink and then cure.

[0018] In steps S201 and S202, the insulating gray ink used is BF-21780 insulating gray ink from Hetianbao Chemical Co., Ltd. The insulating gray ink is sprayed in two coats to ensure the thickness of the entire insulating gray coating, significantly reducing the light transmittance of the switch panel. Simultaneously, spraying the insulating gray ink separately prevents excessive thickness of a single layer, avoids ink accumulation, improves the smoothness of the entire coating layer, and ensures the overall thickness of the insulating gray coating.

[0019] In steps S203-S206, the white ink used is BF-14946 white ink from Hetianbao Chemical Co., Ltd. The white ink is applied in four coats, each a thin layer, to prevent excessive ink buildup and improve the uniformity of the coating. Each coat is cured after application before the next coat is applied, thus improving the adhesion between the inks.

[0020] In step S2, 10% of the corresponding ink weight of curing agent is added to each sprayed ink. Therefore, by adding curing agent, the curing time of each ink can be accelerated.

[0021] During each step of the spraying process, the back of the switch panel is masked, so there is no need to spray the back.

[0022] In steps S201 to S205, the curing temperature is 48 to 55°C and the curing time is 20 to 25 minutes. In step S206, the curing temperature is 48 to 55°C and the curing time is 38 to 45 minutes.

[0023] The base color values ​​of the front side of the switch panel obtained by the spraying process of this invention are: L: 94.00 (±0.3), a: -1.07 (±0.2), b: +0.48 (±0.2), △E≤0.6, and the color of the entire front side of the switch panel is uniform.

[0024] In step S2 of this invention, multiple spraying and curing processes are performed separately, which maximizes the smoothness of the coating and improves the adhesion between the coating layers, resulting in stable performance of the entire switch panel front side, as shown in the table below: Test Project index Test methods Pencil hardness ≥ ≥1H Conducted in accordance with GB / T 6739-2006 Roughness ≤ Ra1.2μm Roughness tester Adhesion (cross-cut test) No higher than level 1 According to GB / T 9286 Resistant to wiping with 99.5% alcohol. 0.5KG force, 50 repetitions without end Fine cotton cloth + weights Resistant to wiping with neutral detergents (such as High-Fuli and White Cat household detergents). 0.5KG force, 50 repetitions without end Fine cotton cloth + weights 24h resistance to neutral detergent No bubbling, no peeling, slight discoloration is permissible. 5% concentration soaking Water resistance 120h No bubbling, no peeling, no slight discoloration In accordance with GB / T1733 Moist heat resistance for 120 hours Free from defects such as whitening, bubbling, wrinkles, obvious loss of gloss and fading, and softening of the paint film. Conducted in accordance with GB / T 1740 Thermal shock No bubbling, no peeling, slight discoloration is permissible. (-20℃*2h, 60℃*2h)*10 times Abrasion resistance (RCA abrasion test) No bottoming out after 30 or more attempts (or 100 attempts with 1KG force). Fine cotton cloth + weights Weather resistance 96h No obvious chalking, and no defects such as breakage, blistering, peeling, or wrinkles. Color difference requirement: 96-hour weathering test, color change ΔE ≤ 6.0. A fluorescent ultraviolet-B lamp with a wavelength of 313 nm was used for 8 hours of UV exposure at a blackboard temperature of 60℃±3℃, followed by 4 hours of condensation at a temperature of 50℃±3℃. One cycle consisted of 12 hours. After spraying the UV matte varnish in step S4, the ink is heated to an energy range of 800~900mJ / cm. 2 Cured under ultraviolet light.

[0025] In one embodiment, the UV matte oil in step S4 comprises the following components in parts by weight: The composition includes 30 parts acrylic resin, 20 parts polyurethane acrylic resin, 2 parts initiator, 1 part leveling agent, 1 part additive, 20 parts butyl acetate, and 5 parts silica. The initiator is 1-hydroxycyclohexylphenyl ketone, which ensures the UV matte oil has excellent non-yellowing properties and will not yellow over long-term use. The leveling agent is polyether-modified silicone oil (CAS number 157479-55-5), which has good compatibility and slip properties, promoting flow and leveling during coating, improving coating uniformity, and enhancing skin feel. The additive is diphenyl-(2,4,6-trimethylbenzoyl)phosphorus oxide, which has a photobleaching effect during curing.

[0026] The components of the aforementioned UV matte oil give the switch panel a skin-like feel after spraying, with a surface roughness Ra≤1.2μm, better meeting the requirements for water resistance, damp heat resistance, weather resistance, and other properties of the switch panel surface.

[0027] In another embodiment, the UV matte oil in step S4 comprises the following components in parts by weight: 45 parts acrylic resin, 35 parts polyurethane acrylic resin, 5 parts initiator, 2 parts leveling agent, 2 parts additives, 25 parts butyl acetate, and 8 parts silica.

[0028] In the third embodiment, the UV matte oil in step S4 comprises the following components in parts by weight: The mixture contains 30-45 parts acrylic resin, 28 parts polyurethane acrylic resin, 3 parts initiator, 1 part leveling agent, 2 parts additives, 23 parts butyl acetate, and 7 parts silica.

[0029] The effects achieved in the above embodiments are basically the same. The weight ratio of each component of the UV matte oil can be adjusted within the above range according to the usage requirements.

[0030] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the inventive concept of the present invention, and these all fall within the protection scope of the present invention.

Claims

1. A switch panel spraying process that improves skin feel, water resistance, damp heat resistance, and weather resistance, characterized in that: Includes the following steps: S1. Clean the surface of the plastic switch panel; S2. Apply multiple coats of paint to the front of the cleaned switch panel; S3. Laser engrave the front of the switch panel to obtain the corresponding text; S4. Apply UV matte paint to the front of the switch panel again; In step S2, each spraying is cured before the next spraying is performed.

2. The switch panel spraying process for improving skin feel and resistance to water, damp heat, and weathering, as described in claim 1, is characterized in that... The multiple spraying processes in step S2 are as follows: S201. Spray an insulating gray ink and cure it. S202, then spray the second layer of insulating gray ink, and then cure it; S203, spray white ink and cure; S204, apply white ink twice and cure; S205, apply three coats of white ink and cure; S206, apply four coats of white ink and then cure.

3. The switch panel spraying process for improving skin feel and resistance to water, damp heat, and weathering, as described in claim 2, is characterized in that... In step S2, 10% of the corresponding ink weight of curing agent is added to each sprayed ink.

4. The switch panel spraying process for improving skin feel and water, damp heat, and weather resistance according to any one of claims 1 to 3, characterized in that, The cleaning in step S1 is performed using plasma cleaning. After cleaning, the dyne value on the front of the switch panel is ≥50.

5. The switch panel spraying process for improving skin feel and resistance to water, damp heat, and weathering, as described in claim 3, is characterized in that... In steps S201 to S205, the curing temperature is 48 to 55°C and the curing time is 20 to 25 minutes. In step S206, the curing temperature is 48 to 55°C and the curing time is 38 to 45 minutes.

6. The switch panel spraying process for improving skin feel and resistance to water, damp heat, and weathering, as described in claim 5, is characterized in that... In step S4, after spraying the UV matte varnish, the ink is heated to an energy range of 800~900mJ / cm. 2 Cured under ultraviolet light.

7. The switch panel spraying process for improving skin feel and resistance to water, damp heat, and weathering, as described in claim 6, is characterized in that... The UV matte oil in step S4 comprises the following components in parts by weight: 30-45 parts acrylic resin, 20-35 parts polyurethane acrylic resin, 2-5 parts initiator, 1-2 parts leveling agent, 1-2 parts additives, 20-25 parts butyl acetate, and 5-8 parts silica.