JP2828648B2 - Repair paint for pearl coating and its repair method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to repair of pearl paint applied to, for example, painting of an automobile body, and facilitates repair of paint defects.

(Prior Art) In recent years, in the coating of automobile bodies, diversification of coating colors is required along with improvement of rust prevention performance, and this is one of the important factors that contribute to the development of the automobile industry.
For example, multicolor painting (so-called two-tone painting etc.)
Such is the pearl coating according to the present invention.

Conventionally known pearl coating has a coating film configuration as shown in FIG. That is, the steel plate 9 constituting the vehicle outer plate
After applying an electrodeposition coating 10 as an undercoat on the top, an intermediate coating 11 is applied. The electrodeposition coating 10 is a coating applied for the purpose of improving the rust prevention of the steel sheet 9. The electrodeposition coating 10 is usually a degreasing step for removing oil, dust, etc. adhering to the surface of the steel sheet. After performing a chemical conversion treatment step of forming an oxide film on the surface of the steel sheet in order to maintain the steel sheet, the steel sheet is coated by a so-called dipping coating method for completely immersing the vehicle body and dried. On the other hand, the intermediate coating 11 is intended to improve the rust prevention of the steel sheet 9 in the same manner as the electrodeposition coating 10, maintain the adhesion with the top coating, and improve the smoothness of the surface of the top coating. Is usually applied with an electrostatic coating gun,
Particularly in recent years, in order to improve the coating efficiency, the coating liquid is mainly applied to the outer panel of the vehicle body by a rotary atomizing type electrostatic coating gun and then dried.

In this way, in a state where the undercoat 10 and the intermediate coat 11 have been applied, while removing foreign substances on the surface of the intermediate coat,
Sanding for smoothing the surface is performed. This sanding is generally known as a so-called water laboratory, which is a method using water, and a dry sanding, which is a method without water, and these two methods are based on process conditions, production models, and the like. Is appropriately selected according to

As shown in FIG. 7, in the first overcoating step, the color base paint 12 is applied to the work on which the intermediate coating film is formed (color base application step 1) and dried (color base drying step 2). Then, in the second overcoating step, a mica base paint 13 (mica base coating step 6) and a clear paint 14 (clear coating step 7) are applied on the color base coating film without interposing a drying step (hereinafter, wet-on-wet). After that, the two paints 13 and 14 are dried at the same time (mica base and clear drying step 8) to complete the pearl coating.

The color base paint 12 is a paint composed of a pigment and a resin, and is a coating film having a color that is felt when the pearl paint is visually observed. The mica-based paint 13 is a paint that does not contain a pigment but is composed of mica pieces and a resin, and constitutes a coating film that irregularly reflects light incident on the pearl coating film by the mica pieces. The mica pieces cause a unique diffuse reflection different from the aluminum pieces contained in the conventional so-called metallic paint, thereby producing an aesthetic appearance of the automobile body. Further, the clear paint 14 is a paint comprising only a resin, which prevents deterioration of a coating film due to ultraviolet rays or the like and provides a gloss of pearl coating. Such a color base paint 12, a mica base paint 13, and a clear paint 14 are usually applied by an electrostatic coating gun.Similarly to the intermediate coating paint, in recent years, in order to improve coating efficiency, rotary atomization is performed. A coating method using a type electrostatic gun is frequently used.

(Problems to be Solved by the Invention) However, in the above-described conventional pearl coating, when a coating defect such as adhesion of a foreign substance is found on the color base coating film 12, the foreign substance at the defective portion is removed. Later, it is necessary to apply a color base paint again and dry it by a heating means such as a simple light bulb, so-called spot repair.
And even if there is only one defective part, the spot repair is performed at about 140 ° C. in the same manner as in a normal drying process.
Since a drying process for 0 minutes is required, the drying cannot be performed in the production line, and the vehicle is held off-line as shown in FIG. 7 (out-of-line repairing process 15). Further, in the process condition where the space outside the line for holding the vehicle body cannot be secured, as shown in FIG. 7, after the foreign matter on the color base coating film 12 is removed (the defect portion polishing step 3), Once again put into the regular overcoating process,
Was re-painted from the top coat process.

The reason for drying the color base paint 12, which is the correction paint, is as follows, after temporarily applying the color base paint,
When the mica base paint 13 is applied by wet-on-wet coating without drying the paint, the boundary portions between the color base paint layer and the mica base paint layer are mixed with each other, and the sharpness after completion of the pearl coating is reduced. This is because such a problem occurs.

Therefore, the conventional pearl coating method has a disadvantage that when a coating defect occurs in the color base coating film, the productivity is significantly reduced. In addition, the above-mentioned spot repair requires skilled skills in order to ensure the color matching and the coating appearance quality of the boundary portion at a predetermined value or more, and there is a problem that the degree of freedom of the operator is small.

The present invention has been made in view of the above-mentioned drawbacks and problems associated with the conventional technology, and has as its object to easily repair a pearl paint color base without impairing productivity.

(Means for Solving the Problems) A first invention for achieving the above object is to apply a color base paint having a predetermined color pigment on a surface of an object to be coated,
In pearl coating obtained by applying a mica base paint having a diffuse reflection material such as mica pieces and applying a clear paint, at least the color pigment contained in the color base paint and the resin contained in the mica base paint Repair paint for pearl coating

Further, a second invention for achieving the above object is to apply a color base paint having a predetermined coloring pigment on a surface of an object to be coated, apply a mica base paint having a diffuse reflection material such as mica pieces, and apply a clear paint. In the pearl coating to be applied, it is a pearl coating repair coating having at least the coloring pigment contained in the color base coating and a resin of the same system as the resin contained in the mica base coating.

Further, a third invention for achieving the above object is to apply a color base paint having a predetermined coloring pigment on a surface of an object to be coated, apply a mica base paint having a diffuse reflection material such as mica pieces, and apply a clear paint. A repair paint for pearl coating, which comprises at least one resin of the same system as the resin contained in the mica base paint.

A fourth aspect of the present invention for achieving the above object is to apply a color base paint on the surface of the object to be coated and to dry the same.
A defect site polishing step of removing foreign matter on the surface of the color base coating film, and a step of applying a repair paint according to any one of the first to third inventions to a part where the foreign matter has been removed. And a method for repairing a pearl coating by applying a mica base paint containing mica pieces on the color base coating film, applying a clear paint, and then simultaneously drying the mica base paint and the clear paint.

(Effect) In the present invention thus configured, after removing foreign matter on the color base coating film, (1) a repair having a coloring pigment contained in the color base coating material and a resin contained in the mica base coating material. A color base paint, (2) a repair color base paint having the same type of resin as the color pigment contained in the color base paint and the resin contained in the mica base paint, and (3) a resin same as the resin contained in the mica base paint. Apply any one of the color base paint for repair having resin, and in this state, apply the mica base paint and the clear paint wet-on-wet,
dry. This makes it possible to easily match the colors of the pearl coating film, and to obtain a pearl coating film with good sharpness without mixing the repairing color base paint and the mica base paint with each other.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a process diagram of a topcoating process showing a method of repairing a pearl coating according to one embodiment of the present invention, and FIGS. 2 to 6 show repair of pearl coating by a repairing method according to one embodiment of the present invention. FIG. 2 is a cross-sectional view showing a change in the coating composition at the time, FIG. 2 is a cross-sectional view showing the coating composition after the color base drying step of FIG. 1 has been completed, and FIG. FIG. 4 is a cross-sectional view showing a coating film structure after completion of the repair color base coating process, and FIG. 5 is a cross-sectional view showing a coating film structure also having completed the mica base coating process. FIG. 6 is a cross-sectional view showing the coating film structure after the completion of the pearl coating of FIG.

In this specification, the term “paint” refers to a state before baking and drying, and refers to a state before being sprayed from a coating gun onto an object and adhered thereto. The term “coating film” is used to mean a state in which the paint is discharged from a paint gun, adheres to an object to be coated, forms a film, and is baked, dried, and cured.

The pearl coating in the present embodiment is applied to the coating of an outer panel of a general automobile body, and the undercoating and the intermediate coating as described above are performed. Is being done. However, it is needless to say that the present invention is not limited to the vehicle body outer panel coating as shown in the present embodiment, but can be applied to parts coating, bumper coating and the like.

As shown in FIG. 1, the top coat coating process of this embodiment is a regular process consisting of five steps of a color base coating step 1, a color base drying step 2, a mica base coating step 6, a clear coating step 7, a mica base and a clear drying step 8. Process, defective portion polishing process 3, repair color base coating process 4
And a repair process consisting of two processes.

Color Base Coating Step 1 The color base coating step 1 is performed in a coating booth maintained at a predetermined wind speed and temperature and humidity, and the vehicle body conveyed by the coating conveyor conveys a plurality of automatic rotating atomizing statics arranged in the booth. Most of the vehicle body outer panel is painted by an electric painting gun (so-called bell painting gun), and the remaining portion is sprayed by an operation previously taught by a painting robot, for example. The color base paint 12 is usually applied with a film thickness of about 20 μm. Here color base paint
As a method of preventing surface flow defects (so-called sagging) of the paint while coating 12 when coating 12, the electrostatic coating gun is arranged in multiple stages and the film thickness is gradually increased in each stage. There is a way to make it happen. According to such a coating method, the solvent contained in the color base paint evaporates to some extent between the stages, thereby preventing a surface flow.

Color Base Drying Step 2 The vehicle body that has completed the color base coating step 1 is guided into the drying device at a predetermined interval. This drying device is a hot-air drying device using butane gas or the like as a fuel, and is usually divided into a dark red zone on the inlet side, an outlet side, and a convection zone. The dark red zone is a zone in which a shielding plate is provided between the hot air heated by butane gas and the vehicle body, and the vehicle body is heated by radiant heat from the shielding plate, and the hot air is not directly blown onto the vehicle body. Further, it is possible to prevent dust from adhering to the coated surface before drying. The coating film surface of the vehicle body that has passed through the dark red zone is hardened to some extent, and the hot air is further hardened by a crosslinking reaction in the convection zone circulating in the drying device. The convection zone has a better drying efficiency than the dark red zone, and is a suitable drying zone for a painted surface on which there is no possibility that dust or the like adheres.

After completing the color base application step 1 and the color base drying step 2 as described above, the vehicle body is carried into an inspection step (not shown) by a coating conveyor. In the inspection step, a coating defect of the color base coating film 12 that has been dried is inspected, and a rejected portion is checked.

Defect portion polishing step 3 and repair color base coating step 4 In this embodiment, the repair step is performed on a conveyor between this inspection step and a mica base coating step 6 described later.
3, 4 are provided. In the repairing steps 3 and 4, first, the foreign matter 16 which is the coating defect is removed with a knife or the like (see FIG. 2), and the surface of the repaired portion is polished with a paper file or the like to make it as flat as possible (FIG. 3). reference). This defect site polishing step 3
Is a step of correcting only the defective part checked in the inspection step. It is preferable to use a fine paper file of # 400 or more.

The repaired color base paint 17 is applied to the smoothed portion after polishing of the defective portion is completed (see FIG. 4).

The repair color base paint 17 is (1) composed of a main component resin of the same material as the main resin of the mica base paint 13 described later, and contains the same color pigment as the color pigment contained in the color base paint 12. (2)
It is composed of the same type of resin as the main component resin of the mica base paint 13 described later and contains the same color pigment as the color pigment contained in the color base paint 12, or (3) the mica base paint described later It may be any one of the same type of resin as the thirteen main component resins. In other words, the mica base for automotive painting is
If the mica base paint 13 used in the mica base application step 6 of the present embodiment is an acrylic-melamine resin, the repair color base paint 17 is also of the same system as that of the acrylic-melamine resin or polyester resin. When the mica base paint 13 is made of a polyester resin, the mica base paint 13 is preferably made of an acrylic melamine resin (preferably of the same system and the same material).
17 is also made of the same type of polyester resin (preferably, the same type of polyester resin of the same material).

Here, the case where the mica base paint 13 is composed of an acrylic-melamine resin will be described in further detail. In the mica base paint having a mixing ratio (weight ratio) of acrylic resin / melamine resin of 7/3, The repair color base paint 17 is composed of an acryl-miraamine resin having a mixing ratio of acrylic resin / melamine resin of 9/1 to 5/5, preferably an acrylic-melamine resin having a mixing ratio of 8/2 to 6/4. Similarly, when the mica base paint 13 has an acrylic resin / melamine resin composition ratio of 6/4, the repair color base paint 17 has an acrylic resin / melamine resin mixture ratio of 9/9.
1-5 / 5 acrylic-melamine resin, preferably 7 / 3-5 / 5
Of acryl-melamine resin. However, as described above, the optimum compounding ratio is the same as the resin component constituting the mica base coating material 13, and it is most preferable that the repairing color base coating material 17 be formed with this mixing ratio.

The color pigment to be mixed into the repair color base paint 17 is the same material as the color base paint 12 as described above, but the compounding ratio is basically such that the color of the intermediate coating film 11 is concealed. A small amount is acceptable. That is, when the color base coating film 12 is polished when the foreign substance 16 is polished with a paper file in the above-described defective portion polishing step 3, the intermediate coating film 11 is exposed, and the mica base coating This is because even when the paint 13 and the clear paint 14 are applied, the color (normal gray color) of the intermediate coating film 11 may not be concealed. However, when the sharpened portion of such an intermediate coating film 11 has an extremely small area, the color of the intermediate coating film appears slightly for that portion, but when compared with the color around the site, The difference between these colors is
Since it is often inconspicuous, the mixing ratio of the coloring pigment mixed into the repair color base paint 17 is small enough as described above.

The repair processes 3 and 4 are all performed on a painting conveyor, that is, in a production line, and can be performed in a short time without providing a specially large space. Since the repair work can be sprayed in the same manner as the ordinary color base paint 12, any skilled person who can even perform the color base coating work can easily perform the repair work.

Mica base coating step 6 and clear coating step 7 A car body having a coating defect on the color base coating film 12 goes through the above-mentioned repairing steps 3 and 4. , 4 are transported or bypassed and carried into a mica base coating step 6 and a clear coating step 7, which are second overcoating steps. In both of the coating steps 6 and 7, the coating booth that has performed the color base coating step 1 may be used again, or a different coating booth may be used. Just do it. In other words, if the space in the paint shop is small and equipment costs are low, 1
One coating booth and a drying apparatus may be used for the first overcoating step of the color base coating step 1 and the mica base and clear coating steps 6 and 7, which are the second overcoating step.

The mica base coating step 6 and the clear coating step 7 are performed by so-called wet-on-wet coating, and the mica base coating 13 is applied by an automatic electrostatic coating gun of a first stage installed in a coating booth, and a predetermined The clear paint 14 is applied at intervals by the second stage automatic electrostatic coating gun. The automatic electrostatic coating guns installed on these first and second stages are devices for applying most of the vehicle body outer panel, and parts that are not painted by the automatic electrostatic painting gun are subjected to, for example, repair painting by a painting robot. Is to be done. In this regard,
Since the same as the above-described color base coating, if an automatic color changing device for changing the spray paint for each vehicle body is added to the automatic electrostatic coating gun, the process can be performed by one coating booth as described above. .

Mica Base / Clear Drying Step 8 The mica base coating film 13 and the clear coating film 14 thus coated by wet-on-wet coating are dried by a drying device similar to the color base drying device. The vehicle body that has been completely subjected to the final coating is transported to a final inspection step (not shown), where the final coating defect is inspected.

 Next, the operation of the present embodiment will be described.

After the color base coating process 1 of the regular process is completed, the vehicle body in which a coating defect is found in the inspection process is transported to the repair processes 3 and 4, where the foreign substances 16 on the surface of the color base coating film 12 are removed by shaving and then removed. Is applied. In this state, at predetermined intervals (hereinafter referred to as setting time), the mica base paint 13 and the clear paint 14
With wet-on-wet coating. In this manner, the repair color base coating film 17 and the mica base coating film 13 form a pearl coating film without being mixed with each other.

Therefore, the color of the repaired part and its surroundings can be easily matched without lowering the sharpness, and the repair can be performed in the production line, thereby improving the productivity of pearl coating. Becomes

In addition, since this repair work is an extremely easy work that can be performed by any worker having the skill of spraying the color base paint, the degree of freedom of the worker selection is increased. To play.

(Effects of the Invention) As described above, according to the present invention, the color base paint is applied to the surface of the object to be coated, and after the color base paint is dried and repaired, the foreign matter on the color base paint surface is removed. A step of polishing a defective portion to be removed;
Applying the repair paint according to any one of the above to a defective portion, and applying a mica base paint and a clear paint on the color base paint film. A pearl coating film is formed without mixing with the coating film.
Therefore, the color of the repaired part and its surroundings can be easily matched without lowering the sharpness, and the repair can be performed in the production line, thereby improving the productivity of pearl coating. There is a great effect in practical use.

(Examples) Next, the present invention will be described in more detail with reference to the present invention, but the present invention is not limited to these examples unless it exceeds the gist thereof.

Examples 1 to 16, 18 to 19, 21 to 22 and Experimental Examples 17, 20
Is for confirming the composition of the color base paint for repair according to the present invention and the compounding ratio thereof, and the like, and repairing the pearl coating by the repair method according to the present invention using the color base paint for repair, The repair was performed by comparing the appearance of the coated film with a normal uncoated pearl coating film. The evaluation results are shown in Tables 1 to 4 described below as “で” when the repair is good and “X” when the repair is bad.

Mica base paint A The mica base paint A used in the present example is an acrylic resin composed of 40 parts by weight of methyl methacrylate, 39 parts by weight of butyl methacrylate, 20 parts by weight of 2-hydroxymethyl methacrylate, and 1 part by weight of acrylic acid. This is a mica-based paint composed of 65 parts by weight, 28 parts by weight of melamine resin, and 7 parts by weight of pearl pigment, and has a mixing ratio of acrylic resin / melamine resin of 7/3.

Mica-based paint B Mica-based paint B used in this example was methyl methacrylate 40 parts by weight, butyl methacrylate
A mica-based paint composed of 56 parts by weight of an acrylic resin comprising 39 parts by weight, 20 parts by weight of 2-hydroxyethyl methacrylate and 1 part by weight of acrylic acid, 37 parts by weight of a melamine resin, and 7 parts by weight of a pearl pigment. Thus, this is a paint having a mixing ratio of acrylic resin / melamine resin of 6/4.

Mica base paint C The mica base paint C used in this example is styrene
20 parts by weight, 40 parts by weight of metal methacrylate, 19 parts by weight of butyl methacrylate, 20 parts by weight of 2-hydroxyethyl methacrylate, 65 parts by weight of acrylic resin composed of 1 part by weight of acrylic acid, 28 parts by weight of melamine resin, and pearl This is a mica-based paint composed of 7 parts by weight of a pigment and having a mixing ratio of acrylic resin / melamine resin of 7/3.

Mica-based paint D Mica-based paint D used in this example was 45.5 parts by weight of a polyester resin composed of 35 parts by weight of isophthalic acid, 10 parts by weight of adipic acid, 40 parts by weight of neopentyl glycol, and 15 parts by weight of trimethylolpropane. And 28 parts by weight of CAB resin, 19.5 parts by weight of melamine resin, and 7 parts by weight of pearl pigment.

Color base paint E The color base paint E used in this example was 35 parts by weight of a polyester resin comprising 35 parts by weight of isophthalic acid, 10 parts by weight of adipic acid, 40 parts by weight of neopentyl glycol, and 15 parts by weight of trimethylolpropane; It is composed of 15 parts by weight of resin and 50 parts by weight of titanium dioxide (pigment).

First, in Examples 1 to 10, when the mixing ratio of acrylic resin / melamine resin in the mica base paint was 7/3 and 6/4, the repair color base paint of the present invention was established as a repair paint for pearl coating. The possible mixing ratio of acrylic resin / melamine resin was confirmed.

Example 1 45 parts by weight of an acrylic resin of the same material as the mica base A, comprising 40 parts by weight of methyl methacrylate, 39 parts by weight of butyl methacrylate, 20 parts by weight of 2-hydroxyethyl methacrylate, and 1 part by weight of acrylic acid; A repair color base paint composed of 5 parts by weight of resin and 50 parts by weight of titanium dioxide (acrylic resin / melamine resin mixture ratio = 9/1), and the mica base paint A (acrylic resin / melamine resin mixture ratio = 7) / 3) and the color base paint E, and repaired in the overcoating step shown in FIG.

The dry film thickness of the repair color base paint at this time was 10
μm, 15μm, 20μm 3 levels (setting time is 60 seconds), and the setting time after applying the repair color base paint is 0.5 minutes, 1 minute, 3 minutes, 4 levels (dry film thickness is (The level of the film thickness and the setting time of this repair color base coating film is the same in Examples 1 to 16, 18 to 19, 21 and Examples 17 and 20 below). Table 1 shows the results.

Example 2 A repair color base composed of 40 parts by weight of an acrylic resin, the same material as in Example 1, 10 parts by weight of melamine resin, and 50 parts by weight of titanium dioxide (acrylic resin / melamine resin mixture ratio = 8/2). Paint, and the mica-based paint A,
The color base paint E was used for repair in the overcoating step shown in FIG. Table 1 shows the results.

Example 3 A repair color base composed of 35 parts by weight of an acrylic resin of the same material as in Example 1, 15 parts by weight of a melamine resin, and 50 parts by weight of titanium dioxide (acrylic resin / melamine resin mixture ratio = 7/3). Paint, and the mica-based paint A,
The color base paint E was used for repair in the overcoating step shown in FIG. Table 1 shows the results.

Example 4 A repair color base composed of 30 parts by weight of acrylic resin, 20 parts by weight of melamine resin, and 50 parts by weight of titanium dioxide (acrylic resin / melamine resin mixture ratio = 6/4) of the same material as in Example 1 Paint, and the mica-based paint A,
The color base paint E was used for repair in the overcoating step shown in FIG. Table 1 shows the results.

Example 5 A repair color base composed of 25 parts by weight of acrylic resin, 25 parts by weight of melamine resin, and 50 parts by weight of titanium dioxide (acrylic resin / melamine resin mixture ratio = 5/5) of the same material as in Example 1 Paint, and the mica-based paint A,
The color base paint E was used for repair in the overcoating step shown in FIG. Table 1 shows the results.

Example 6 The same color base paint for repair as in Example 1 and the mica base paint B (acrylic resin / melamine resin compounding ratio =
6/4) and the color base paint E, and repaired in the overcoating step shown in FIG. Table 1 shows the results.

Example 7 Using the same color base paint for repair as in Example 2, the mica base paint B and the color base paint E, repair was carried out in the overcoating step shown in FIG. Table 1 shows the results.

Example 8 Using the same repair color base paint as in Example 3, the mica base paint B and the color base paint E, repair was carried out in the overcoating step shown in FIG. Table 1 shows the results.

Example 9 Using the same color base paint for repair as in Example 4, the mica base paint B and the color base paint E, repair was carried out in the overcoating step shown in FIG. Table 1 shows the results.

Example 10 Using the same color base paint for repair as in Example 5, the mica base paint B and the color base paint E, repair was carried out in the overcoating step shown in FIG. Table 1 shows the results.

As is clear from the results, when the mixing ratio of acrylic resin / melamine resin of the mica base paint is 7/3 (Examples 1 to 5), the mixing ratio of acrylic resin / melamine resin of the color base paint for repair is 9%. / 1 to 5/5, preferably 8/2 to 6/4. In the case where the acrylic resin / melamine resin mixture ratio of the mica base paint is 6/4 (Examples 6 to 10), the acrylic resin / melamine resin mixture ratio of the repair color base paint is 9/1 to 5 /.
5, preferably in the range of 7/3 to 5/5.

Next, a repair color base paint using the acrylic resin constituting the myr base paint and a different material acrylic resin (Examples 11 to 13), and a repair color base paint using the same acrylic resin (Examples 14 to 14) 16) and the difference was confirmed.

Example 11 20 parts by weight of styrene, 40 parts by weight of methyl methacrylate, 19 parts by weight of butyl methacrylate, 20 parts by weight of 2-hydroxyethyl methacrylate, 40 parts by weight of an acrylic resin composed of 1 part by weight of acrylic acid, and 10 parts by weight of a melamine resin FIG. 1 shows a color base paint for repair consisting of a mica-based paint A and a color-based paint E, which are composed of a part and a titanium dioxide of 50 parts by weight (acrylic resin / melamine resin mixture ratio = 8/2). It was corrected in the overcoating process.
Table 2 shows the results.

Example 12 A repair color base composed of 35 parts by weight of acrylic resin, 15 parts by weight of melamine resin, and 50 parts by weight of titanium dioxide (acrylic resin / melamine resin mixture ratio = 7/3) of the same material as in Example 11 Paint, and the mica-based paint A,
The color base paint E was used for repair in the overcoating step shown in FIG. Table 2 shows the results.

Example 13 A repair color base composed of 30 parts by weight of an acrylic resin, the same material as in Example 11, 20 parts by weight of a melamine resin, and 50 parts by weight of titanium dioxide (acrylic resin / melamine resin mixture ratio = 6/4) Paint, and the mica-based paint A,
The color base paint E was used for repair in the overcoating step shown in FIG. Table 2 shows the results.

Example 14 A repair color base composed of 40 parts by weight of an acrylic resin, the same material as in Example 11, 10 parts by weight of melamine resin, and 50 parts by weight of titanium dioxide (acrylic resin / melamine resin mixture ratio = 8/2) Using the paint, the above-mentioned my base paint C and the color base paint E, repair was carried out in the overcoating step shown in FIG. Table 2 shows the results.

Example 15 A repair color base composed of 35 parts by weight of acrylic resin, the same material as in Example 11, 15 parts by weight of melamine resin, and 50 parts by weight of titanium dioxide (acrylic resin / melamine resin mixture ratio = 7/3) Paint, and the mica-based paint C,
The color base paint E was used for repair in the overcoating step shown in FIG. Table 2 shows the results.

Example 16 A repair color base composed of 30 parts by weight of an acrylic resin, the same material as in Example 11, 20 parts by weight of a melamine resin, and 50 parts by weight of titanium dioxide (acrylic resin / melamine resin mixing ratio = 6/4) Paint, and the mica-based paint C,
The color base paint E was used for repair in the overcoating step shown in FIG. Table 2 shows the results.

As is clear from these results, the case where the acrylic resin was made of a different material (Examples 14 to 16) was used when the resin was made of the same material as the mica base paint (Examples 14 to 16).
Repair workability of pearl coating is better than that of ~ 13).

Next, in Examples 18 to 19 and Experimental Examples 17 and 20, compatibility between the material of the mica base paint and the material of the repair color base paint according to the present invention was confirmed.

Experimental Example 17 35 parts by weight of isophthalic acid, 10 parts by weight of adipic acid, 40 parts by weight of neopentyl glycol, trimethylolpropane 15
Using a repair color base paint composed of 35 parts by weight of a polyester resin consisting of parts by weight, 15 parts by weight of a melamine resin, and 50 parts by weight of titanium dioxide, and the mica base paint A and the color base paint E, FIG. Was repaired in the overcoating process shown in the above. Table 3 shows the results.

Example 18 Using the same repair color base paint as in Example 17, the mica base paint D, and the color base paint E, the first
It was repaired in the overcoating process shown in the figure. Table 3 shows the results.

Example 19 24.5 parts by weight of the same polyester resin as in Example 17, CAB
Using a repair color base paint composed of 15 parts by weight of a resin, 10.5 parts by weight of a melamine resin, and 50 parts by weight of titanium dioxide, the mica base paint D and the color base paint E, the overcoating step shown in FIG. Repaired. Table 3 shows the results.

Experimental Example 20 An acrylic resin composed of 40 parts by weight of methyl methacrylate, 39 parts by weight of butyl methacrylate, 20 parts by weight of 2-hydroxyethyl methacrylate, and 1 part by weight of acrylic acid
35 parts by weight, melamine resin 15 parts by weight, titanium dioxide 50
Using the color base paint for repair consisting of parts by weight and the mica base paint D and the color base paint E,
It was repaired in the overcoating step shown in FIG. Table 3 shows the results.
Shown in

As is clear from these results, when the mica base paint is composed of an acrylic / melamine resin (Experimental Example 17), the repair color base paint must also be composed of the acrylic / melamine resin. When the mica base is composed of a polyester resin (Examples 18 to 19 and Experimental Example 20), the repair color base paint must also be composed of a polyester resin.

Further, in Examples 21 and 22, the amount of the coloring pigment mixed in the repair color base paint according to the present invention was confirmed.

Example 21 40 parts by weight of methyl methacrylate, 39 parts by weight of butyl methacrylate, 20 parts by weight of 2-hydroxymethacrylate, 52.5 parts by weight of an acrylic resin composed of 1 part by weight of acrylic acid, 22.5 parts by weight of a melamine resin, and 25 parts of titanium dioxide The repair was carried out in the overcoating step shown in FIG. 1 using the repair color base paint composed of parts by weight and the mica base paint A and the color base paint E. Table 4 shows the results.

Example 22 A repairing color base paint containing the same acrylic resin as in Example 21 and 30 parts by weight of a melamine resin and containing no coloring pigment, and the mica base paint A and the color base paint E were used. It was repaired in the overcoating process shown in the figure. Table 4 shows the results.

As is evident from the results, it was confirmed that the repair can be sufficiently performed depending on the coating conditions without mixing a coloring pigment into the repair color base paint according to the present invention.

[Brief description of the drawings]

FIG. 1 is a process diagram of a top coat painting process showing a method of repairing a pearl paint according to one embodiment of the present invention, FIG. 2 is a cross-sectional view showing a coating film structure after the color base drying process of FIG. 1, FIG. 3 is a cross-sectional view showing a coating film structure after completion of the defect portion polishing step, FIG. 4 is a cross-sectional view showing a coating film structure also having completed the repair color base coating step, and FIG. FIG. 6 is a cross-sectional view showing the structure of the coating film after the base coating process is completed, FIG. 6 is a cross-sectional view showing the structure of the coating film after the completion of the pearl coating shown in FIG. 1, FIG. FIG. 8 is a sectional view showing the structure of a conventional pearl coating film. 1 ... Color base coating step, 2 ... Color base drying step, 3 ... Defect portion polishing step, 4 ... Repair color base coating step, 6 ... Mica base coating step, 7 ... Clear coating step, 8 ... Mica Base / clear drying process,
9 ... steel plate, 10 ... undercoat, 11 ... intermediate coat, 12
…… Color base coating, 13 …… Mica base coating, 14…
… Clear coating, 15… Color base coating for repair (color base coating for repair).

Continued on the front page (51) Int.Cl. ⁶ Identification code FI C09D 167/00 C09D 167/00

Claims (4)

(57) [Claims] 1. A pearl coating obtained by applying a color base paint having a predetermined color pigment on a surface of an object to be coated, applying a mica base paint having a diffuse reflection material such as mica pieces, and applying a clear paint. A paint for repairing pearl coating, comprising the coloring pigment contained in the color base paint and the resin contained in the mica base paint. 2. A pearl coating obtained by applying a color base paint having a predetermined color pigment on a surface of an object to be coated, applying a mica base paint having a diffuse reflection material such as mica pieces, and applying a clear paint. A repair paint for pearl coating, comprising the coloring pigment contained in a color base paint and a resin of the same system as the resin contained in the mica base paint. 3. A pearl coating obtained by applying a color base paint having a predetermined coloring pigment to a surface of an object to be coated, applying a mica base paint having a diffuse reflection material such as mica pieces, and applying a clear paint. A pearl paint repair paint that has the same type of resin as the resin contained in the mica base paint. 4. A polishing step for removing a foreign matter on the surface of the color base coating film after applying and drying the color base coating material on the surface of the object to be coated, and a step of removing the foreign matter on the part where the foreign matter has been removed. Applying the repair paint according to any one of (1) to (3), applying a mica-based paint containing mica pieces onto the color base paint film and applying a clear paint. A method for repairing pearl paints by drying mica base paint and clear paint at the same time.