JPS6193872A - Pearl mica two-tone painting method - Google Patents

Abstract

PURPOSE:To enhance outward appearance, by applying the two-tone painting of a color base paint to an article to be painted at first after the completion of a series of processes such as under coating and subsequently applying a mica base paint and a clear paint to the entire surface of the base paint film in succession. CONSTITUTION:At first, an electrodeposition paint film 2 as an under coat paint film and an intermediate paint film 3 are applied to the steel panel 1 constituting a car body. Next, a color base paint film 3 having the A-color of two-tone B/A colors is formed to the selected region on the paint film 3 and a color base paint film 6 having the B-color among the two-tone B/A colors is further formed in the same way. At last, a mica base paint film 7 used in the B/A colors in common and a clear paint film 8 are successively formed to the entire surfaces of the color base paint films 4, 6 to complete pearl mica two-tone painting.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a coating method.More specifically, the present invention relates to a coating method in which pearl mica is applied to an outer panel of an automobile body in order to improve its appearance. - Concerning the method of performing two-tone painting.

[Conventional technology]

It is well known that pearl mica two-tone paint, which is a combination of burl mica paint and two-tone paint, is used to enhance the beauty and appearance of automobile bodies. Burl mica painting is a painting method in which a base layer, which is the basis of the color, and a finishing layer that creates a glossy window are used to form the paint color, and the base layer is a colored solid paint. The color base is a color base, and the finishing layer is a mica-based paint film (a mica powder-dispersed low-hidden paint film containing dispersed burr mica pigment consisting of natural mica as a core and a coating of titanium dioxide covering it). and clear coating are used, respectively. In addition, two-tone painting usually means finishing the lower layer paint color (first paint color) on the two-tone boundary cross section, and applying masking tape after that is completed.

This refers to a painting method that is completed by performing parting and masking with masking paper 1, etc., then finishing the upper layer (second coating color), and finally peeling off the masking tape and masking paper 2.In short, pearl mica・Two-tone painting attempts to obtain the characteristics of Burl Mica painting and two-tone painting at the same time.

As a conventional pearl mica two-tone painting method, the following methods are generally known: 1. Undercoat process An undercoat paint is applied to the entire car body, and then dried.

2. Intermediate coating process Using intermediate coating paint, apply it to the outer panel of the vehicle body. At this time, the interior panels of the car body may also be painted in color and dried.

3. First color base painting step A color base paint (first paint color) of the two-tone B/A colors, that is, a colored solid paint, is applied and dried.

4. Mica-based painting process Apply mica-based paint.

5. Clear paint process: Apply a clear paint to the mica base paint film that is formed first, and then dry.

6. Masking process Masking tape and masking paper for color A area.

Masking is performed using a masking means such as the above to prevent the B color paint from adhering to the A color area in the subsequent second color base painting process.

7. Second color base painting step Apply the color base paint of color B (second paint color) of the two-tone B/A colors f:li and dry.

8. Mica-based painting process Said step 4. Same as .

9. Clear painting process Said step 5. Same as .

10. A series of masking means peeling steps! ! ! Once the coating process is complete, the spent masking means is stripped off to obtain the desired coating system.

However, in this conventional pearl mica two-tone painting method, as can be understood from the above, the color base + mica base + clear painting process is repeated twice, which increases the amount of paint used and requires a large amount of drying energy. It becomes necessary. Furthermore, this method
Since there is a significant difference in film thickness at the two-tone boundary, the appearance is not good, and peeling and chipping of 1151 occurs from the step. Also, with this method, clear 1!1
If the adhesion between Color Base Coating No. 1 and the second color base coating is not good, delamination may occur between these coatings.

[Problem that the invention seeks to solve]

As mentioned above, the conventional pearl mica two-tone painting method requires a large amount of paint, a large amount of drying energy is required to dry the paint film, and a noticeable step is formed at the two-tone boundary, which is exposed. Between the eyebrows #1
There are problems to be solved, such as separation.The present invention attempts to solve these problems.

[Means for solving problems]

According to the present invention, the above-mentioned problems can be solved by first applying a two-tone color base paint to the object to be painted, especially an automobile body, which has undergone a series of preceding painting processes, such as undercoating and intermediate coating, and then applying this two-tone coating. This problem can be solved by the pearl mica two-tone coating method, which is characterized by sequentially applying mica-based paint and clear paint to the entire surface of the paint film.

According to a preferred embodiment of the pearl mica two-tone coating method according to the present invention, the following steps are performed: Coating a color base paint of color A of two-tone B/A colors on a selected area of the object to be coated; dry, apply a color base paint of color B of the two-tone B/A colors to the remaining area of the object to be painted and a part of the selected area, and dry this, and a two-tone paint film is formed. The process consists of sequentially applying a mica-based paint and a clear paint to the entire surface and drying them.

〔Example〕

Next, a preferred embodiment of the present invention will be described with reference to the accompanying drawings.

Figure 1 shows line segment 1-1 of an automobile body after pearl mica two-tone painting according to the present invention shown in Figure 2.
FIG. From this figure, it can be seen that the undercoat film, that is, electrodeposition (E
D) Coating film 2, intermediate coating film 3, color base coating of A color (first f!!i color) of two-tone B/A color, M4, color B (second coating color) of two-tone base B/A color It will be understood that the color base coating 6, mica base coating 7, and clear coating 8 of ) are sequentially applied.

The coating system shown in FIG. 1 can advantageously be obtained through the series of steps shown in FIGS. 3a to 3g. Painted body steel plate.

As a pretreatment step, a phosphate film is formed by washing, degreasing, and chemical conversion treatment.

1. Undercoating process (Fig. 3a) The car body steel plate 1 on which a phosphate film (not shown) is to be formed is subjected to ordinary electrodeposition coating to form an undercoat film 2 with a film thickness of approximately 15 to 25 μm.
form and dry.

2. Intermediate coating process (Figure 3b) After forming the undercoat film 2, a normal intermediate coating is applied to form an intermediate coating 113 having a film thickness of about 20 to 40 μm, and then dried. In this process, not only the intermediate coating of the outer body panels, but also the inner panel color coating of the inner panels may also be performed.

3. 1st color base fJ! Painting process (Fig. 3C) Intermediate coating with color base paint of color A (11th color) of the desired two-tone B/A colors! ! ! ! A selected area on JIla is coated and dried to form an A color base coating film 4 having a film thickness of about 20 to 40 μm.

4. Masking step (Figure 3d) Masking is performed to form a parting line and to prevent the eight-color paint from adhering to the desired part of the A color base coating film 4 in the next second color base coating step. In this step, for example, masking tape is applied to the necessary areas on the four-color color base coating film 4.

This can be advantageously done by pasting a suitable masking means 5 such as masking paper.

5. Second color base V! Mounting process (Fig. 3e) Under the above masking conditions, B of the two-tone B/A color
Color (second paint color) color base paint f! ! The coating is coated and dried to form an eight-color color base coating film 6 having a film thickness of about 20 to 40 μm.

6. Masking means #I separation step (Fig. 3f) After forming the 8-color color paste 2III6, NM the used masking means 1 As shown in the figure, B on the color base
/A color two-tone paint film is completed.

7. Mica base coating process (Fig. 3g) A mica base coating film for B/A colors is applied to the entire surface of the formed two-tone coating yl to a film thickness of approximately 10 to 25 am. ! ! Get M7.

8. Clear coating process (Figure 1) A clear coating is applied to the entire surface of the mica base coating @7 that is formed first, and then dried. Formed or rear! ! ! 8
The film thickness of 1B is preferably about 20 to 40 μm.

Also, clear! ! ! ! Mounting can also be carried out after drying the mica base.

In the case of the pearl mica two-tone coating system shown in cross section in Figure 1, B
The /A color boundary line is only a step in the thickness of the 8-color color base coating 6, and the appearance quality is the same as above, and the mica base 111!7 and clear coating 8 are continuous! ! ! Since they are covered with a film, peeling between the eyebrows will not occur between the A color base coating film 4 and the 8 color color base coating film 6.

Next, for reference, the conventional pearl mica two-tone coating method described above will be explained step by step with reference to FIGS. 4a to 4j. ), intermediate coating step (FIG. 4b), and first color base coating step (FIG. 4C) are the steps 0. ~3°, so the explanation will be omitted here to avoid duplication.

4. Mica base painting process (4th cl) process 3. A mica base paint for color A (commonly used for color B described below, i.e., the same) is applied to the color base paint film 4 for color A formed in step 4 to form a mica base paint 7 having a film thickness of 10 to 25 μm. Form.

5. Clear coating process (Figure 4e) A clear coating film 8 with a film thickness of 20 to 40 μm is formed by coating the mica base coating m*7 with a clear coating material.

6. Masking step (Fig. 4f) Masking is performed to form a parting line and to prevent the B color paint from adhering to the desired portion of the lower clear coating film 8 in the next second color base painting step. This step can be advantageously carried out by applying appropriate masking means 5, such as masking tape or masking paper, to the required portions of the clear coating film s.

7. Second color base painting process (Fig. 4g) Under the masking conditions described above, paint the color base paint of color B (second paint color) among the two-tone paint colors to achieve a film thickness of 20.
An eight-color color base coating film 6 of ~40 μm is formed.

8. Mica base coating process (Figure 4h) Process 7. A mica-based paint for color B (same as for color A) was applied to the 8-color color base paint film 6 formed in step 1 to obtain a film thickness of 1.
A mica base coating film 7' having a thickness of 0 to 25 μm is formed.

9. Clear coating process (Fig. 41) A clear coating is applied on the mica base coating 7' to form a clear coating 8' having a thickness of 20 to 40 μm.

10. Masking means peeling step (Fig. 4j) After forming the clear coating film 8', the used masking means is peeled off and removed.

Through the series of steps described above, the pearl mica two-tone coating system shown in cross section in FIG. 4j is finally obtained. However, this coating system differs from the coating system according to the method of the present invention described above with reference to FIGS. 3a to 3g, in that the B color base f! 1B, M thickness level difference between mica base 7' and clear coating film 8' occurs on the B/A color boundary line, which is unfavorable for appearance.Furthermore, due to this level difference and the properties of the paint used, the clear coating film 8 and B color base painting II! There is also a high risk of peeling between the eyebrows.

〔Effect of the invention〕

According to the present invention, it is possible to eliminate the drawbacks of the conventional pearl mica two-tone coating method that could not be solved up to now, and to provide an automobile body with better appearance. First, it is possible to eliminate the two consecutive processes of mica-based coating and clear coating, so the paint cost and baking drying energy required for these processes can be reduced. Furthermore, as a result of the reduction in the number of painting work steps, the process is simplified and the processing time is also shortened. Furthermore, since the number of passes through the baking drying oven can be reduced, it is possible to prevent or alleviate discoloration of the interior panels coated in the engine compartment and trunk room, such as yellowing due to excessive baking drying.

Furthermore, since the difference in film thickness at the B/A color boundary line can be reduced, the appearance quality is significantly improved.

Furthermore, according to the present invention, 8
A two-tone paint film is formed by directly coating the color base paint film, and this two-tone paint film (including the difference in film thickness at the BZA color boundary line) is covered with a combination of a mica base paint film plus a clear paint film. Therefore, the appearance quality of the B/A color boundary line can be further improved, and delamination between the coating films can be prevented.

[Brief explanation of drawings]

FIG. 1 shows how pearl mica is produced by the present invention shown in FIG.
Lines of a car body with two-tone paint! -! FIG. 2 is a schematic side view of an automobile body coated with pearl mica two-tone coating; FIGS. 3a to 3g are illustrations of the coating of the present invention to obtain the coating system of FIG. 1. 4a to 4j are cross-sectional views showing the conventional pearl mica two-tone coating method in order. In the diagram, 1 is the vehicle body plate, 2 is the undercoat film, 3 is the intermediate paint film, and 4 is the A color base F! ! The film 6 is an 8-color color base coating film, 7 is a mica base coating film, and 8 is a clear coating film.

Claims (1)

[Claims] 1. A method for applying pearl mica two-tone coating to an automobile body, in which a two-tone color base paint is first applied to the object to be coated after the preceding painting process has been completed, and then the entire surface of this two-tone paint film is applied. A pearl mica two-tone coating method characterized by sequentially applying a mica base paint and a clear paint to the surface. 2. Apply a color base paint of color A of the two-tone B/A colors to a selected area of the object to be painted and dry it, and apply the above paint to the remaining area of the object to be painted and a part of the selected area. Applying a color base paint of color B out of the two-tone B/A colors and drying it, and sequentially applying a mica base paint and a clear paint on the entire surface of the formed two-tone paint film and drying them.
A pearl mica two-tone coating method according to claim 1.