A method of painting a transition solid paint

Abstract

The present application belongs to the field of transition solid color paint coating technology of passenger cars, and provides a transition solid color paint coating method, which comprises: preparing multi-stage transition color paint, each stage of color paint being mixed from base dark paint and base light paint, wherein, from the first stage of color paint to the penultimate stage of color paint, the proportion of base light paint is increased in gradient; the base dark paint accounts for 50%-55% in the last stage of color paint; spraying is performed in segments from top to bottom along the vertical direction of the vehicle body in the order from deep to shallow color; the spraying coverage of each stage of color paint is set to a height, and wet-on-wet process is used for continuous spraying of multiple passes; transparent varnish is sprayed on the surface of the entire gradient color paint layer, and 4%-8% base dark paint is added to the varnish, and the transition solid color paint is obtained. The passenger car coated by the method of the present application has soft color transition and good overall coordination, and can meet the requirements of appearance indexes such as paint film gloss and orange peel degree.

Description

Technical Field

[0001] This invention belongs to the field of transitional solid color paint coating technology for passenger vehicles, and relates to a coating method for transitional solid color paint. Background Technology

[0002] The information disclosed in this background section is intended only to enhance understanding of the overall background of the invention and is not necessarily to be construed as an admission or in any way implying that such information constitutes prior art known to those skilled in the art.

[0003] In the process of painting the topcoat of buses, it is very difficult to use solid color paint that transitions from dark to light from top to bottom, so as to achieve the purpose of transition color, make the transition interface invisible to the naked eye, and at the same time maintain other painting indicators (gloss, orange peel, paint film thickness, etc.).

[0004] For example, a study disclosed a method for creating a gradient coating, in which n different colored paints with varying color concentrations are sprayed sequentially onto the area to be coated in order of increasing or decreasing color concentration. However, this method results in a large color difference.

[0005] Therefore, there is an urgent need for a transitional solid color paint spraying solution that can both achieve the purpose of transitional color and ensure coating quality. Summary of the Invention

[0006] To address the aforementioned problems, this invention provides a method for applying transitional solid color paint. After research and analysis, and by testing large-scale sample trials with various process schemes, the method described above was found to produce the best coating effect.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: A first aspect of the present invention provides a method for applying a transitional solid color paint, comprising: A multi-stage transitional paint was prepared, with each stage consisting of a mixture of a base dark paint and a base light paint. The proportion of the base light paint gradually increased from the first stage to the penultimate stage. In the final stage, the base dark paint comprised 50%-55% of the total paint. Spray paint in sections from top to bottom along the vertical direction of the car body, following the order of color from dark to light. Each level of paint has a set coverage height and is applied in multiple coats using a wet-on-wet process. A clear varnish is sprayed onto the entire surface of the gradient paint layer, and 4%-8% of a base dark paint is added to the varnish to obtain the final product.

[0008] In a second aspect, the present invention provides a passenger vehicle painted using the method described above.

[0009] A third aspect of the present invention provides the application of the above-described method in the coating of vehicles, machinery, and electronic products.

[0010] Beneficial effects of the present invention (1) The bus painted using the method of the present invention uses a solid color paint that transitions from dark to light from top to bottom, which achieves the purpose of transition color and makes the transition interface invisible to the naked eye, while maintaining other painting indicators that should be achieved (gloss, orange peel, paint film thickness, etc.).

[0011] (2) By spraying a medium proportion of "light green + 50%-55% dark green" paint at the end of the gradient transition paint, the present invention effectively reduces the color difference of the product; at the same time, the present invention adds a small amount of base dark paint to the clear varnish to utilize the micro-adjustment effect of the clear varnish layer, further enhancing the softness of the color transition and the overall coordination, while meeting the appearance indicators such as gloss and orange peel of the paint film.

[0012] (3) The coating method of the present invention is simple, practical and easy to promote. Attached Figure Description

[0013] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. Exemplary embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0014] Figure 1 Image of a color chart; Figure 2 This is a diagram illustrating the coating process of the present invention; Figure 3 This is a photograph of the product after spraying in Example 1 of the present invention; Figure 4 This is a photograph of the product after spraying in Comparative Example 1 of the present invention; Figure 5 This is a photograph of the product after spraying, as shown in Comparative Example 2 of the present invention. Detailed Implementation

[0015] It should be noted that the following detailed descriptions are exemplary and intended to provide further illustration of the invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0016] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of skill in the art. The reagents and raw materials used in this invention are readily available through conventional means, and unless otherwise specified, they are used in accordance with conventional methods in the art or product instructions. Similarly, unless otherwise specified, the test methods of this invention are performed in accordance with conventional methods in the art or industry-standard methods or practices. Furthermore, any methods and materials similar to or equivalent to those described herein may be applied to the methods of this invention. The preferred embodiments and materials described herein are for illustrative purposes only.

[0017] This invention mainly proposes a method for applying transitional solid color paint, including: A multi-stage transitional paint was prepared, with each stage consisting of a mixture of a base dark paint and a base light paint. The proportion of the base light paint gradually increased from the first stage to the penultimate stage. In the final stage, the base dark paint comprised 50%-55% of the total paint. Spray paint in sections from top to bottom along the vertical direction of the car body, following the order of color from dark to light. Each level of paint has a set coverage height and is applied in multiple coats using a wet-on-wet process. A clear varnish is sprayed onto the entire surface of the gradient paint layer, and 4%-8% of a base dark paint is added to the varnish to obtain the final product.

[0018] The gradient variation range and proportion of the transition paint affect the coating effect of the gradient paint layer. Therefore, this invention studies the proportion of multi-stage transition paint. Preferably, the multi-stage transition paint has nine stages, and the proportions are as follows, by volume: ①Dark green; ②Dark green + 5%-6% light green; ③Dark green + 10%-12% light green; ④ Dark green + 20%-24% light green; ⑤ Dark green + 30%-36% light green; ⑥ Dark green + 45%-50% light green; ⑦ Dark green + 65%-70% light green; ⑧ Dark green + 95%-96% light green; ⑨ Use light green + 50%-55% dark green to achieve a better coating effect.

[0019] Light green is an abbreviation for a base light-colored paint, and dark green is an abbreviation for a base dark-colored paint.

[0020] The spraying height of each color paint is a key parameter affecting the naturalness and uniformity of color transition. Therefore, this invention has studied the setting height. Preferably, the setting height is 40-60 cm to obtain better color transition naturalness and overall harmony.

[0021] In gradient color spray painting, partial overlap of the spraying areas of two adjacent color paints is the core technical means to achieve a natural color transition. Its impact is mainly reflected in the smoothness of the transition effect and the visual quality. Therefore, this invention studies the width of the overlapping area. Preferably, the spraying areas of two adjacent color paints partially overlap, and the width of the overlapping area is 20-30 cm, in order to obtain a better transition effect and visual quality.

[0022] The wet-on-wet process is a construction method in which subsequent spraying is carried out before the sprayed paint film is completely dry. This invention studies the specific steps of the wet-on-wet process. Preferably, the wet-on-wet process is used to spray two coats continuously. The first coat is a solid spray to ensure color saturation and coverage. When spraying the second coat, the distance of the spray gun is increased and the angle of the spray gun is adjusted to create an upward paint mist blurring effect.

[0023] The spraying process affects the quality and gloss effect of the coating. Therefore, this invention studies the conditions of the spraying process. Preferably, for the first coat, the spray gun distance is 200-210mm, the overlap of the spray pattern is 2 / 3, the spray gun angle is perpendicular to the vehicle body, and the coating thickness is 40-45μm. Preferably, for the second coat, the spray gun distance is 300-320mm, the spray gun angle is 15°-20°, the vertical line of the vehicle body is used as a reference, the overlap of the spray pattern is 1 / 2, and the coating thickness is 20-25μm, to obtain a better coating effect.

[0024] Adding a small amount of base dark paint to the clear varnish utilizes the fine-tuning effect of the clear varnish layer to further enhance the smoothness of color transition and overall harmony, while simultaneously meeting appearance indicators such as gloss and orange peel texture. Therefore, this invention studies the amount of base dark paint added and the spraying process. Preferably, 5%-6% base dark paint is added to the clear varnish, and the spraying process involves a spray gun distance of 200-250mm, a fan-shaped overlap of 2 / 3, a spray gun angle perpendicular to the vehicle body, and a spray thickness of 20-25μm to achieve the desired coating effect.

[0025] The present invention will be further described in detail below with reference to specific embodiments. It should be noted that the specific embodiments are explanations of the present invention and not limitations thereof.

[0026] In the following examples and comparative examples, the color chart numbers are as follows:

[0027] The varnish was a commercially available product, purchased from Donglai Coatings Technology (Shanghai) Co., Ltd.

[0028] Example 1 (1) Design and application of multi-level gradient color system To achieve the desired gradient effect (from dark to light from top to bottom), nine levels of transition paint are pre-designed and mixed. Each level of paint is created by mixing a base dark color paint with a base light color paint in a specific volume ratio, forming a smooth color density gradient.

[0029] The transition paint, designed to range from dark green to light green, uses nine color formulas: ①Dark green; ②Dark green + 5% light green; ③Dark green + 10% light green; ④ Dark green + 20% light green; ⑤ Dark green + 30% light green; ⑥ Dark green + 45% light green; ⑦ Dark green + 65% light green; ⑧ Dark green + 95% light green; ⑨ Light green + 50% dark green.

[0030] (2) Segmented wet-on-wet overlay spraying method The paint is applied in sections from top to bottom along the vertical direction of the car body, following the order of color from darkest to lightest.

[0031] Each color paint layer is sprayed to a set height (40 cm) and two coats are applied continuously using a wet-on-wet process.

[0032] The spraying areas of two adjacent color paints partially overlap, with the width of the overlap area controlled within a specific range (20 cm) to achieve a natural blending of colors.

[0033] (3) Spray gun trajectory and atomization control technology When spraying each level of paint, the first coat is applied using a solid spray, with a spray gun distance of 200mm, a fan-shaped overlap of 2 / 3, and the spray gun angle perpendicular to the car body. The coating thickness is 40μm to ensure color saturation and coverage.

[0034] During the second coat, the distance between the spray guns was increased (300mm) and the angle of the spray guns was adjusted (the nozzle was slightly tilted upwards by 15°). The overlap of the fan-shaped areas was 1 / 2, creating an upward blurring effect of the paint mist. The coating thickness was 20μm to enhance the smoothness of the transition between adjacent color areas.

[0035] (4) Color matching and varnishing process of transparent varnish A clear varnish is sprayed onto the entire gradient paint layer. This clear varnish is obtained by mixing 5% of a base dark paint into the varnish. The spraying process is as follows: spray gun distance 200mm, fan-shaped overlap 2 / 3, spray gun angle perpendicular to the vehicle body, and spray thickness 20μm. Utilizing the fine-tuning effect of the clear varnish layer further enhances the smoothness of the color transition and overall harmony, while simultaneously meeting appearance indicators such as paint film gloss and orange peel texture.

[0036] The spraying process is as follows Figure 2 As shown in the photo, the product after spraying is as follows: Figure 3 As shown, by Figure 3 It is evident that the bus painted using the method of this invention achieves the purpose of transitional color while making the transition interface invisible to the naked eye, and at the same time maintains other painting indicators that should be met (gloss, orange peel, paint film thickness, etc.). Color difference meter testing shows that the color difference value of the same part of the product is 0.4, which meets the requirement that the color difference of solid color paint should be ≤1.0.

[0037] Example 2 (1) Design and application of multi-level gradient color system To achieve the desired gradient effect (from dark to light from top to bottom), nine levels of transition paint are pre-designed and mixed. Each level of paint is created by mixing a base dark color paint with a base light color paint in a specific volume ratio, forming a smooth color density gradient.

[0038] The transition paint, designed to range from dark green to light green, uses nine color formulas: ①Dark green; ②Dark green + 5% light green; ③Dark green + 10% light green; ④ Dark green + 20% light green; ⑤ Dark green + 30% light green; ⑥ Dark green + 45% light green; ⑦ Dark green + 65% light green; ⑧ Dark green + 95% light green; ⑨ Light green + 50% dark green.

[0039] (2) Segmented wet-on-wet overlay spraying method The paint is applied in sections from top to bottom along the vertical direction of the car body, following the order of color from darkest to lightest.

[0040] Each color paint layer is sprayed to a set height (40 cm) and two coats are applied continuously using a wet-on-wet process.

[0041] The spraying areas of two adjacent color paints partially overlap, with the width of the overlap area controlled within a specific range (20 cm) to achieve a natural blending of colors.

[0042] (3) Spray gun trajectory and atomization control technology When spraying each level of paint, the first coat is applied using a solid spray, with a spray gun distance of 210mm, a fan-shaped overlap of 2 / 3, and the spray gun angle perpendicular to the car body. The coating thickness is 45μm to ensure color saturation and coverage.

[0043] During the second coat, the distance between the spray guns was increased (300mm) and the angle of the spray guns was adjusted (the nozzle was slightly tilted up by 20°). The overlap of the fan-shaped areas was 1 / 2, creating an upward blurring effect of the paint mist. The coating thickness was 20μm to enhance the smoothness of the transition between adjacent color areas.

[0044] (4) Color matching and varnishing process of transparent varnish A clear varnish is sprayed onto the entire gradient paint layer. This clear varnish is obtained by mixing 5% of a base dark paint into the varnish. The spraying process is as follows: spray gun distance 250mm, fan-shaped overlap 2 / 3, spray gun angle perpendicular to the vehicle body, and a coating thickness of 25μm. Utilizing the fine-tuning effect of the clear varnish layer further enhances the smoothness of the color transition and overall harmony, while simultaneously meeting appearance indicators such as paint film gloss and orange peel texture.

[0045] The spraying results show that the bus painted using the method of this invention achieves the purpose of transition color, and the transition interface is not visible to the naked eye. At the same time, it also maintains other coating indicators that should be achieved (gloss, orange peel, paint film thickness, etc.).

[0046] Example 3 (1) Design and application of multi-level gradient color system To achieve the desired gradient effect (from dark to light from top to bottom), nine levels of transition paint are pre-designed and mixed. Each level of paint is created by mixing a base dark color paint with a base light color paint in a specific volume ratio, forming a smooth color density gradient.

[0047] The transition paint, designed to range from dark green to light green, uses nine color formulas: ①Dark green; ②Dark green + 5% light green; ③Dark green + 10% light green; ④ Dark green + 20% light green; ⑤ Dark green + 30% light green; ⑥ Dark green + 45% light green; ⑦ Dark green + 65% light green; ⑧ Dark green + 95% light green; ⑨ Light green + 50% dark green.

[0048] (2) Segmented wet-on-wet overlay spraying method The paint is applied in sections from top to bottom along the vertical direction of the car body, following the order of color from darkest to lightest.

[0049] Each color paint layer is sprayed to a set height (40 cm) and two coats are applied continuously using a wet-on-wet process.

[0050] The spraying areas of two adjacent color paints partially overlap, with the width of the overlap area controlled within a specific range (20 cm) to achieve a natural blending of colors.

[0051] (3) Spray gun trajectory and atomization control technology When spraying each level of paint, the first coat is applied using a solid spray, with a spray gun distance of 200mm, a fan-shaped overlap of 2 / 3, and the spray gun angle perpendicular to the car body. The coating thickness is 40μm to ensure color saturation and coverage.

[0052] During the second coat, the spray gun distance was increased (320mm) and the spray gun angle was adjusted (the nozzle was slightly tilted upwards by 18°). The overlap of the fan-shaped areas was 1 / 2, creating an upward blurring effect of the paint mist. The spray thickness was 25μm to enhance the smoothness of the transition between adjacent color areas.

[0053] (4) Color matching and varnishing process of transparent varnish A clear varnish is sprayed onto the entire gradient paint layer. This clear varnish is obtained by mixing 5% of a base dark paint into the varnish. The spraying process is as follows: spray gun distance 220mm, fan-shaped overlap 2 / 3, spray gun angle perpendicular to the vehicle body, and coating thickness 22μm. Utilizing the fine-tuning effect of the clear varnish layer further enhances the smoothness of the color transition and overall harmony, while simultaneously meeting appearance indicators such as paint film gloss and orange peel texture.

[0054] The spraying results show that the bus painted using the method of this invention achieves the purpose of transition color, and the transition interface is not visible to the naked eye. At the same time, it also maintains other coating indicators that should be achieved (gloss, orange peel, paint film thickness, etc.).

[0055] Comparative Example 1 The difference from Example 1 is that the application of the color paint "⑨ light green + 50% dark green" is omitted.

[0056] Spraying effect as Figure 4 As shown, the color difference is significant. According to colorimeter testing, without the application of "⑨ light green + 50% dark green" spraying, the color difference value for the same area of ​​the product is 1.6, which does not meet the production requirement that the solid color paint color difference ≤ 1.0.

[0057] Comparative Example 2 The difference from Example 1 is that ordinary clear varnish (without adding base dark paint) is sprayed.

[0058] Spraying effect as Figure 5As shown in the comparison between Example 1 and Comparative Example 2, although ordinary clear varnish has the effect of enhancing brightness, the addition of a small amount of base dark paint can utilize the color adjustment effect of the clear varnish layer to further enhance the softness of color transition and overall coordination, while meeting appearance indicators such as gloss and orange peel.

[0059] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for applying a transitional solid color paint, characterized in that, include: A multi-stage transitional paint was prepared, with each stage consisting of a mixture of a base dark paint and a base light paint. The proportion of the base light paint gradually increased from the first stage to the penultimate stage. In the final stage, the base dark paint comprised 50%-55% of the total paint. Spray paint in sections from top to bottom along the vertical direction of the car body, following the order of color from dark to light. Each level of paint has a set coverage height and is applied in multiple coats using a wet-on-wet process. A clear varnish is sprayed onto the entire surface of the gradient paint layer, and 4%-8% of a base dark paint is added to the varnish to obtain the final product.

2. The coating method for transitional solid color paint as described in claim 1, characterized in that, The multi-stage transition paint has nine stages, and the formulation is as follows, by volume: ①Dark green; ②Dark green + 5%-6% light green; ③Dark green + 10%-12% light green; ④ Dark green + 20%-24% light green; ⑤ Dark green + 30%-36% light green; ⑥ Dark green + 45%-50% light green; ⑦ Dark green + 65%-70% light green; ⑧ Dark green + 95%-96% light green; ⑨ Light green + 50%-55% dark green.

3. The coating method for transitional solid color paint as described in claim 1, characterized in that, The set height is 40-60 cm.

4. The coating method for transitional solid color paint as described in claim 1, characterized in that, The spraying areas of two adjacent color paints partially overlap, with the overlap area being 20-30 cm wide.

5. The coating method for transitional solid color paint as described in claim 1, characterized in that, The process involves two consecutive wet-on-wet spraying coats. The first coat is a solid spray to ensure color saturation and coverage. During the second coat, the distance between the spray guns is increased and the angle of the spray guns is adjusted to create an upward blurring effect.

6. The method for applying a transitional solid color paint as described in claim 5, characterized in that, For the first coat, the spray gun distance is 200-210mm, the overlap of the spray pattern is 2 / 3, the spray gun angle is perpendicular to the car body, and the coating thickness is 40-45μm.

7. The method for applying a transitional solid color paint as described in claim 5, characterized in that, For the second coat, the spray gun distance is 300-320mm, the spray gun angle is 15°-20°, the vertical line of the car body is used as the reference, the fan-shaped overlap is 1 / 2, and the spray thickness is 20-25μm.

8. The coating method for transitional solid color paint as described in claim 1, characterized in that, The clear coat contains 5%-6% of a base dark paint. The spraying process involves a spray gun distance of 200-250mm, a fan-shaped overlap of 2 / 3, a spray gun angle perpendicular to the vehicle body, and a coating thickness of 20-25μm.

9. A passenger vehicle painted according to the method described in any one of claims 1-8.

10. The application of the method according to any one of claims 1-8 in the coating of vehicles, machinery and equipment, and electronic products.

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