JP3213239B2 - Repair paint method of red paint color - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for repairing a red paint.

[0002]

2. Description of the Related Art In general, a coating film applied to an outer panel of an automobile or the like is usually a multi-layer coating film composed of an undercoating film, an intermediate coating film, and a topcoating film. The method of repairing the damage generated in the above-mentioned method is usually to sand the center of the damaged portion to the periphery thereof, perform so-called “feather edge setting”, attach a putty for repair to the sanded portion, and apply a primer surface. -Sur coating is performed, and further overcoating is performed including the normal coating portion around the sanding portion.

[0003] When the top coat color of the above-mentioned automobile outer panel is a red-based coat color, the coat color is poorly concealable. Therefore, these top coat colors are usually affected by the middle coat color. It has a dark (cloudy) finish color.

[0004] Therefore, in the repair of this red-based paint color, in order to similarly produce the color affected by the intermediate paint color of the normal coating film, the concealing property has been conventionally improved before the red overcoat is applied. An undercoat (co-color) having good and lightness adjustable was previously applied, and the color of the normal coat portion was matched with the combination of the co-color and the red top coat.

In general, a gray color obtained by mixing white and black primary colors for concealment and lightness adjustment has been used for this co-color, but has the following problems.

[0006] When performing the overcoating of the red paint color including the normal coating portion around the sanding portion, as shown in FIG. 1, the film thickness of the overcoat is gradually increased over the normal coating portion around the sanding portion. When the blurring repair is performed to reduce the thickness, the overcoat is skewed at the portion indicated by the arrow 1 and the presence or absence of the undercolor, which is the undercolor, becomes conspicuous.

If the film thickness of the overcoat on the consonant area indicated by the arrow 1 is set to the normal film thickness, the normal film overcoat also overlaps the surrounding normal coating film. As for the coating color, the concealment of the red color is improved, and a difference easily occurs between the coating color and the tint of the adjacent unrepaired normal coating film portion.

[0008] The red overcoat color tends to change depending on the number of coatings (film thickness) of the red-based overcoat applied on the common color.

In the case of gray-color coating, if the mist adheres to a gap in a door or the like where masking is difficult, the mist becomes conspicuous and it takes time to remove the mist.

[0010] The gray-color is an achromatic color and has no color. Therefore, a red overcoat color applied thereon has a Nigor tendency.

[0011]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to solve the above-mentioned problems, and as a result, as a co-color of a red-based overcoat, a concealment with a paint color close to the overcoat color in terms of lightness and color. By using an undercoating (co-color) paint having good properties, even in the case of an overcoat having poor concealing property in the repair of a blur, the co-color is inconspicuous, and the coating color is hardly affected by the film thickness of the overcoat. Have been found, and the present invention has been achieved.

That is, according to the present invention, after a damaged portion of the solid red coating film surface is sanded to a slightly larger area than the damaged portion, a putty for repair is attached to the sanded portion as necessary, and a primer surfacer is provided. -A repair coating method of performing painting, and further performing undercoating and solid red topcoating including a normal coating portion around the sanding portion, wherein the coating by the undercoating is from a perpendicular to the coating surface. Under a colorimetric condition of illuminating from an angle of 30 ° and receiving light at an angle of 25 ° to the illumination light source side from the regular reflection direction of this illumination angle, the absolute value of the ΔL value with respect to the coating color of the normal coating portion is 5.
0 or less, and a method for repairing a red paint color characterized by having a paint color in which the absolute value of the Δa value is in the range of 6.0 or less, and a method for repairing a damaged red paint film surface. After sanding to a slightly larger area than the damaged part, repairing putty is applied to the sanding part as necessary, primer surfacer painting is performed, and even the normal coating part around the sanding part is included. A repair coating method for performing undercoating and bright red topcoating, wherein a coating film of the undercoating is illuminated from an angle of 30 ° from a perpendicular to the coating film surface, and an illumination light source is obtained from a regular reflection direction at the illumination angle. 95 ° to the side
In the colorimetric condition of receiving light at an angle of?, The absolute value of the ΔL value with respect to the coating color of the normal coating film portion is 5.0 or less, and the absolute value of the Δa value is within the range of 6.0 or less. It is intended to provide a method for repair coating of a red paint color characterized by the following.

Hereinafter, the present invention will be described.

The red coating film to which the method of the present invention is applied is a conventionally known multi-layer coating film comprising an undercoating film including an electrodeposition layer, a further intermediate coating film, and a red-based overcoating film.
Alternatively, it may be any of a red paint color such as a pearl type or a metallic glitter type. It is appropriate that the damaged portion formed on the surface of the coating film is sanded to a slightly larger area than the damaged portion to perform so-called "feather edge". The sanding portion is appropriately degreased and washed, and then, if necessary, a repair putty is attached to the portion, and a primer surface is applied.
Surface coating is performed, the surface of each is adjusted to be smooth by polishing, etc., and the damaged portion is filled.

Next, an undercoating (co-color coating) is performed including the normal coating film surrounding the sanding portion.

According to the method of the present invention, when the coating color of the coating film is a solid coating color as the co-color coating, the coating film is illuminated from an angle of 30 ° from a perpendicular to the coating film surface, and the illumination angle is positive. Under a colorimetric condition of receiving light at an angle of 25 ° from the reflection direction to the illumination light source side, the absolute value of the ΔL value with respect to the coating color of the normal coating portion is 5.0 or less, preferably 3.5 or less, and the absolute value of the Δa value Is used in the range of 6.0 or less, preferably 4.0 or less. On the other hand, when the top coating color is a glitter type such as pearl or metallic, a glitter pigment is used. Because of the flip-flop property, the color tone fluctuates greatly depending on the light receiving conditions at the time of colorimetry, and from the viewpoint of consistency between the colorimetric value and visual observation, illumination is performed at an angle of 30 ° from a perpendicular to the coating film surface. 95 ° from the specular reflection direction to the illumination light source side
The absolute value of the ΔL value with respect to the coating color of the normal coating portion is 5.0 or less, preferably 3.5 or less, and the absolute value of the Δa value is 6.0 or less, preferably 4 An undercoat paint (co-color paint) which is within the range of 0.0 or less is used.

Here, the colorimetry is performed by a two-way colorimeter “CR35”.
3 "(manufactured by Minolta Co., Ltd.), the L and a values (according to Hunter's color difference formula) of the normal coating portion and the co-color coating film were measured under the above conditions, and the difference was determined. is there. 2 above
The 5 ° direction is commonly referred to as highlight (front view),
The direction is an angle commonly called a shade (watermark or undertone). The L and a values of this co-color coating film are measured values when the co-color coating film has a film thickness that hides the base.

If the absolute values of the ΔL and Δa values exceed the above ranges, a difference is likely to occur between the coating color and the tint of the unrepaired normal coating portion adjacent to the repaired portion, and the color consistency deteriorates. Not preferred.

In the toning of the paint used for the co-color coating, from the viewpoint of concealment, the primary primary color coating solution of red to orange having a pigment concentration of 5 to 24% by weight, preferably 10 to 24% by weight, based on the coating solution. It is desirable to use In particular, when the a-value of the co-color coating film is about 40 or more (colorimetric conditions of 25 ° irradiation and front light reception), the concealment is apt to be reduced, so that the pigment concentration of the main primary color coating solution is 15 to 24. It is desirable to be as high as% by weight.

The coating amount of the above-mentioned concolor coating film is usually about 15 to 30 μm in terms of dry film thickness.

A reddish topcoat is applied on the above-mentioned concolor coating film, including the normal coating portion around the concolor coating film portion. The red-based overcoat paint used here is a paint that is toned from the paint color of a normal coating film portion other than the damaged portion. In the case of such a top coat, in the case of a solid system, usually, a solid top coat is applied in a dry film thickness of about 20 to 60 μm. 6
After coating about 0 μm, a clear paint is further applied in a dry film thickness of about 40 to 80 μm, and a softening repair coating is performed to gradually reduce the thickness of the overcoat from the color matching portion to the normal coating portion. it can. In the present invention, since the color matching is good due to the above-mentioned co-color, even if the co-color is not concealed by the overcoat film (even if the concealing film thickness is not applied).
Good.

[0022]

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to examples.

Preparation of test plate / Test plate P1: An intermediate coating ("Amirac TP65", manufactured by Kansai Paint Co., Ltd., gray color) is applied to a 300.times.450.times.0.8 mm electrodeposited steel plate to a dry film thickness of 30 .mu.m. After painting and baking, finish coat ("Magiclon / Toyota 35
8 ", manufactured by Kansai Paint Co., Ltd., Pale color)
m, and a clear paint ("Magiclon Clear", manufactured by Kansai Paint Co., Ltd.) was applied on a wet-on-wet basis to a dry film thickness of 40 [mu] m and baked to obtain a test plate P1. L of the top coating film surface of this test plate P1,
The a values were 6.7 and 11.3 (shade colorimetric conditions), respectively.

Test plate P2: Test plate P2 was prepared in the same manner as test plate P1, except that "Magiclon / Honda R72P" (top paint of Kansai Paint Co., Ltd., pearl color) was used as the top coat. Obtained. This test plate P2
L and a values of the overcoated film surface are 9.0, 22.
5 (shade colorimetric condition).

Test plate P3: Test plate P1 except that "Magiclon Nissan AH3" (Kansai Paint Co., Ltd., top coat, pearl color) is used as the top coat in test board P1.
In the same manner as in the above, a test plate P3 was obtained. The L and a values of the overcoated surface of this test plate P3 were 19.0 and 30.2, respectively.
(Shade colorimetric conditions).

Test plate S1: 300 × 450 × 0.8 m
m on an electrodeposited steel sheet with an intermediate coating (“Amirac TP6
5 ", manufactured by Kansai Paint Co., Ltd., gray color)
m, and after baking, finish coat ("Magiclon / Toyota 3H7", Kansai Paint Co., solid color)
Was painted and baked so as to have a dry film thickness of 40 μm to obtain a test plate S1. The L and a values of the overcoated surface of this test plate S1 were 28.3 and 43.0 (highlight colorimetric conditions), respectively.

Test plate S2: A test plate S2 was obtained in the same manner as the test plate S1, except that “Magiclon / Mazda SQ” (top paint, manufactured by Kansai Paint Co., Ltd., solid color) was used as the top coat. . The L and a values of the overcoated surface of this test plate S2 were 31.7 and 56.
4 (highlight colorimetric condition).

(Note 1) The L and a values of the coating film surface were illuminated at an angle of 30 ° from a perpendicular to the coating film surface using a two-way colorimeter “CR353” (manufactured by Minolta). A colorimetric condition (shade colorimetric condition) in which the light is received at an angle of 95 ° from the specular reflection direction of the illumination angle toward the illumination light source side, and illumination is performed from an angle of 30 ° from a perpendicular to the coating film surface to be measured. The measurement was performed under colorimetric conditions (highlight colorimetric conditions) in which light was received at an angle of 25 ° from the specular reflection direction toward the illumination light source.

Preparation of Undercoat (Co-Color) Paints Each of the undercoat (co-color) base paints A to F was prepared by using the following primary color paints in the composition shown in Table 1.

Primary color paint: Watching manganese red pigment used, solid content 51% by weight, (pigment / resin) weight ratio 1.31, pigment concentration 24% by weight Primary color paint: Perylene red pigment used, solid content 37 Weight%, (pigment / resin) weight ratio 0.29, pigment concentration in paint 7.3% by weight Primary color paint: quinacridone red pigment used, solid content 26
% By weight, (pigment / resin) weight ratio 0.18, pigment concentration in paint 6.2% by weight Primary color paint: using ferric oxide red pigment, solid content 41% by weight, (pigment / resin) weight ratio 0 37, pigment concentration 11% by weight in paint Primary color paint: Benzimidazolone yellow pigment used, solid content 41% by weight, (pigment / resin) weight ratio 0.55, pigment concentration in paint 15% by weight Primary color paint: Titanium white-based white pigment used, solid content: 51% by weight, (pigment / resin) weight ratio: 1.26, pigment concentration in paint: 28% by weight Primary color paint: Use of azo yellow pigment, solid content: 36% by weight,
(Pigment / resin) weight ratio 0.17, pigment concentration in paint 6.
0% by weight Primary color paint: Carbon black pigment used, solid content 34% by weight, (pigment / resin) weight ratio 0.05, pigment concentration in paint 1.8% by weight

[0031]

[Table 1]

Repair Coating Example 1 The center of the test plate P1 was scratched to reach the electrodeposition coating film, sanded to a slightly larger area than the scratched area with water-resistant abrasive paper, washed with water, and degreased and washed. Thoroughly dried.
Next, the part was put on with a polyester putty "SU putty" (manufactured by Kansai Paint Co., Ltd.), dried and polished, and then a primer surfacer "KAR Plasafgre-"
(Manufactured by Kansai Paint Co., Ltd.), dried, polished and adjusted to be smooth.

Then, a curing agent is added to the above-obtained co-color base coating material A in a portion including the normal coating film portion around this portion, and a co-color coating material obtained by appropriately diluting this to a coating viscosity is obtained. Was spray-painted. The number of coatings required for concealment was two, and the dry film thickness was 16 μm. The L and a values (shade colorimetry conditions) of the surface of the co-color coating film were measured, and the absolute values of ΔL and Δa with respect to the normal coating film were both 2.0.

Next, on this co-colored coating film, including the normal coating film portion around the co-colored coating film portion, a pearl red overcoat toned from the coating color of the normal coating film portion of the test plate P1. The paint was spray-painted. Paint (dry) film thickness 30μ required for concealment
m. Further, a clear top coat was spray-coated thereon to obtain a repair coated plate. L, a, b of the repair coating surface
From the colorimetry of the value, ΔE with the normal surface is 0.8 in the highlight,
The shade was as good as 0.7.

Examples 2 to 5 and Comparative Examples 1 to 10 In Example 1, the test plate and the co-color coating were performed as shown in Table 2, and the topcoat paint was toned from the coating color of the normal coating portion of each test plate. Each repaired coated plate was obtained in the same manner as in Example 1 except that a top coat was applied by using. From the colorimetry of the L, a, and b values of each repair coating film surface, ΔE from the normal surface was as shown in Table 2. Thus, in the repair-coated plate of the example, the toe color and the top coat
The repaired part and the unrepaired normal coated part obtained very good color matching from both angles of highlight and shade, but the repaired coated sheet of the comparative example shows Even when the top coat was applied with the same film thickness, sufficient color matching could not be obtained.

The following evaluation test was performed for each repair coating. Table 2 shows the results.

(Evaluation Test) (1) Color Consistency with Overcoat When obtaining each repair coated plate, the overcoat at the time of repair was adjusted to a dry film thickness of 40 μm so that the repaired portion and the unrepaired normal paint were applied. The consistency of the color with the film was visually evaluated (（: good,
Δ: slightly different color, ×: considerably different color).

(2) Color stability according to the number of times of overcoating When obtaining the above-mentioned repaired coated plates, the topcoats at the time of repairing were prepared to have a dry film thickness of 20, 40, and 60 μm, respectively. The color stability according to the number of times of coating was visually evaluated (: stable, Δ: slightly changed in color, ×: considerably changed in color).

[0039]

According to the method of the present invention, in the repair coating of the red coating film, the color matching with the normal surface can be achieved even if the common color is not concealed by the overcoating by performing the co-color coating which is close in color and has good concealment. Because of its good properties, the presence or absence of co-color such as blurring (feather portion) becomes less noticeable even in red with poor concealment, and the influence of color on the film thickness of the overcoat is reduced. The match was improved. Further, since the consonant color is a chromatic color close to the topcoat color, even the overcoat of a high saturation color has less color stiffness, and is easy to toning and has high practicality.

[0040]

[Table 2]

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a coating film for explaining a repair coating method.

[Description of Signs] 1 Feather part (part where the thickness of the repaired top coat gradually decreases)

────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshihiko Shioda 33-1, Kanzakicho, Amagasaki-shi, Hyogo Kansai Paint Co., Ltd. Examiner, Kansai Paint Co., Ltd. Yoshinori Murayama (56) References JP-A-6-447 (JP, A JP-A-7-228807 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B05D 1/00-7/26

Claims (2)

(57) [Claims] 1. After sanding a damaged portion of a solid red coating film to a slightly larger area than the damaged portion, a repair putty is applied to the sanded portion as necessary, and a primer surfacer coating is performed. In addition, a repair coating method of performing undercoating and solid red topcoating including a normal coating portion around the sanding portion, wherein the coating by the undercoating is 30 ° from a perpendicular to the coating surface.
Under the colorimetric condition of receiving the light at an angle of 25 ° from the specular reflection direction of the illumination angle to the illumination light source side, the absolute value of the ΔL value with respect to the coating color of the normal coating portion is 5.0 or less, Δa
A repair coating method for a reddish paint color, having a paint color whose absolute value is within a range of 6.0 or less. 2. After sanding a damaged portion of the glittering red coating film to a slightly larger area than the damaged portion, a repair putty is applied to the sanded portion as necessary, and a primer surfacer coating is performed. A repair coating method for performing undercoating and a bright red topcoat including a normal coating portion surrounding the sanding portion, wherein the coating by the undercoating is 30 ° away from a perpendicular to the coating surface. Under the colorimetric condition of illuminating from an angle and receiving light at an angle of 95 ° from the specular reflection direction of the illumination angle toward the illumination light source, the absolute value of the ΔL value with respect to the coating color of the normal coating portion is 5.0 or less, and the Δa value A method for repairing a reddish paint color, wherein the method has a paint color in which the absolute value of is within the range of 6.0 or less.