JP2017225967A - Coating method for multicolor pattern - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a multicolor pattern coating method capable of making non-prominent the uneven feeling of a multicolor pattern in which uncoated portions are partially left.SOLUTION: After an under-layer coating is applied to the whole of a coating face, a top coat paint of a color different from that of said under-layer coating is so partially recoated that coating left portions may scatter thereby to form a laminated multi-pattern. In the multicolor pattern coating method, moreover, a clear paint containing a flat coloring material of an average particle size of 0.1 to 2.0 mm by 0.05 to 2.0 weight parts with respect to 100 weight parts of a paint is additionally applied to the surface of a multicolor pattern.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a method for painting a multicolor pattern, in which after applying the base paint to the entire painted surface, a multicolor pattern is formed by partially recoating the overcoat paint in a color different from that of the base paint so that the unpainted portions are scattered. About.

  In recent years, ceramic siding materials with high design and texture have been frequently used on the outer walls of detached houses, etc., and recently there are more and more variations in uneven design shapes and various color schemes, and the types of designs are Compared to that, it has increased dramatically.

  However, as a choice for performing repainting due to deterioration over time, repainting with a single color has been the mainstream. This impairs the appearance of the advanced design when newly installed. In addition, a multicolored paint containing fine colored particles or gel can be applied, but it is not possible to achieve a large and versatile finish as in the case of new installation. In addition, it can be repainted with clear paint to inherit the appearance when newly installed, but it cannot be changed to a large variety of finishes different from when newly installed, and it restores the appearance that has faded due to coating deterioration. It is difficult. For this reason, the development of a repainting method that can inherit the appearance of large and diverse colors like the newly established ceramic siding material has been awaited.

  Here, in the repainting of ceramic siding materials with large unevenness and jointed designs, two-color coating is conventionally used, in which the entire painted surface is colored with a base paint and then only the convex portions are overlaid with different colors. Has been implemented since. However, this method cannot be carried out unless the substrate (siding material) has an uneven shape, and multicolor finishing of three or more colors is difficult in principle.

  On the other hand, Patent Document 1 describes a coating method that can easily achieve a large and diverse color scheme even at the site of repainting. This can be applied to the recoating of ceramic siding material, and it is not only applied to the concave portion and the convex portion separately, but it is also possible to apply 2 to the convex portion itself by coating the convex portions so that the unpainted portions are scattered. Various patterns more than color can be formed.

  On the other hand, the mainstream designs of ceramic siding materials, such as stone-tone, brick-like, and tile-like, are textured by finishing with a paint containing colored aggregates in addition to the uneven design shape and various color schemes. There are many things that have been granted. As described above, there are many known coating methods for producing a natural stone-like variety with a paint containing colored aggregates.

  For example, Patent Document 2 describes an aqueous grain-like paint containing 20% by weight or more of flake colored mica having a particle size of 1 to 5 mm.

  Patent Document 3 describes a coating film formed by applying and curing a coating composition containing a colored aggregate on a projection plane on the surface of a substrate to be coated having irregularities.

  Patent Document 4 discloses an aqueous stone-like multicolored pattern coating composition comprising colored particles in a paint at a ratio of 20 to 60% by weight and colored flakes in a ratio of 0.1 to 20% by weight in the paint. Have been described.

  Patent Document 5 discloses a decorative board in which a base coating layer, a picture layer, and a transparent protective layer are sequentially provided on a base material, on at least one layer selected from the base material, the base coating layer, the picture layer, and the transparent protective layer. Furthermore, there is described a decorative board in which aggregate is dispersed or sprayed with aggregate paint, or aggregate is dispersed in at least one layer selected from a base paint layer, a picture layer and a transparent protective layer.

  In Patent Document 6, coloring is applied to the surface of a base material (an object to be coated) having a concavo-convex surface with a height difference of 0.5 to 15 mm so that the convex portion has a color tone different from other portions. And a coating film structure having a concavo-convex surface, which is formed by laminating a coating film formed by coating a clear paint or a color clear paint and a colored aggregate having a particle size of 10 to 150 μm thereon. Has been.

  Patent Document 7 discloses a coating method for an exterior clear finish coating board in which a sealer layer, a base enamel layer, and a layer made of a clear paint containing 1 to 30 parts by mass of colored mica are laminated in this order on a base material. Have been described.

  In Patent Document 8 and Patent Document 9, a multi-color paint containing two or more kinds of colored particles having different hues is applied to a base having a decorative part and a joint part so that the colored particles are spotted. Is described.

Japanese Patent No. 5905632 Japanese Patent Laid-Open No. 7-18217 JP-A-10-230220 JP 2000-86942 A JP 2000-127329 A Japanese Patent No. 4021604 JP 2004-149776 A Japanese Patent No. 5215023 Japanese Patent No. 5215021

  By the way, when coating is performed by rubbing the paint using a roller, a brush, or the like, a coating mark composed of fine streaks is formed. Also, in the case of spray painting by spraying, paint marks with poor smoothness, commonly called “Yuzu skin” or “mandarin skin” due to misregistration of paint viscosity, booth temperature, or air flow, or defective spray gun, etc. May be formed. Such uneven coating marks hinder the appearance of a natural texture.

  In addition, after applying the base paint to the entire painted surface, when forming a multicolored pattern in which the overcoat paint of a color different from that of the base paint is partially applied so that the unpainted areas are scattered, If the boundary line with the overlapped portion is clear, the natural feeling of various textures on the same surface is impaired.

  On the other hand, in the coating method of Patent Document 1, since the boundary line between the unpainted portion and the coating overlap portion becomes clear when viewed from any angle, the natural texture of the same surface is lost.

  An aqueous stone-tone coating material containing 20% by weight or more of flake colored mica having a particle diameter of 1 to 5 mm as in Patent Document 2, and 20 to 60% by weight of colored particles in the paint as in Patent Document 4. In the coating method of laminating a clear paint layer containing 1 to 30 parts by mass of colored mica as in Patent Document 7, the particle size of the colored aggregate is large or contained Since the amount is large, it interferes with the design of the multicolored pattern as the groundwork.

  The method for forming a coating film of Patent Document 3 is to apply a coating composition containing aggregate on the convex surface of the surface of the substrate to be coated having an uneven surface, and also to the concave portion. Not what you want.

  Patent Document 5 is a makeup method in which a transparent protective layer containing aggregate is laminated on a pattern layer formed by a gravure offset printing method, an ink jet printing method, a transfer printing method, or the like. Can only be implemented with advanced and precise factory coating. In addition, the pattern layer is formed as a single layer and does not form a pattern color by partially stacking different colors.

  The coating film structure of Patent Document 6 is obtained by laminating a clear paint or a color clear paint containing a colored aggregate on a ground surface in which convex portions and concave portions having different heights are colored with different colors. The multicolored base is not considered. Moreover, the uneven | corrugated surface whose height difference is 0.5-15 mm is made into a to-be-coated object, and it does not aim at making the boundary level | step difference inconspicuous.

  The painting method of patent document 8 and patent document 9 is a base material having a makeup part and a joint part having a difference in brightness, and a multi-pattern paint containing two or more kinds of colored particles having lightness close to one of them and different hues. By applying the colored particles so as to be spotted, for example, the colored particles become inconspicuous only at the joints. This makes the boundary step of the multicolored pattern inconspicuous, and is completely different from the purpose of painting to make the paint mark of the multicolored pattern inconspicuous.

  The present invention aims to make the presence of paint marks inconspicuous when painting a paint, and while making the most of the colorful pattern in which the unpainted part is scattered, the boundary step of the colorful pattern is also inconspicuous, The object is to provide a method for painting a variety of patterns that can express a variety of patterns with a flat and natural texture (appearance).

  As a means for this, the multi-pattern coating method of the present invention is such that after the base paint is applied to the entire coating surface, the overcoat paint of a color different from that of the base paint is partially applied so that the unpainted residue is scattered. , Forming multi-layered patterns. In addition, a clear paint containing 0.05 to 2.0 parts by weight of a flat colored product having an average particle size of 0.1 to 2.0 mm with respect to 100 parts by weight of the paint before blending the flat colored product. The coating surface is overcoated on the surface of the multicolored pattern.

The “clear paint” in the present invention is a concept including not only a colorless and transparent clear paint but also a colored clear paint. The “average particle size” means the volume average particle size (MV) of the primary particles and indicates the d ₅₀ value of the particle size distribution. The average particle size can be generally determined by a laser diffraction type particle size distribution measuring apparatus. In the present invention, “XX to XX” indicating a numerical range means “XX or more and XX or less” unless otherwise specified.

  In the coating method of the present invention, the surface of the multicolored pattern is obtained by blending a flat colored material into the clear paint to be overcoated on the multicolored pattern having unevenness due to the coating mark and having a boundary step. A spotted pattern is given to the whole. However, since the flat colored product has an appropriate size (average particle size) and content, it does not hinder the design of the multicolored pattern that is the original pattern. On the other hand, by spotting the spotted pattern unconsciously, the visual effect makes the unevenness caused by the paint marks and the boundary step of the overpainting inconspicuous, and a colorful pattern with a flat and natural texture (look) It can be expressed.

2 is a comparative photograph of Example 1 and Comparative Example 1. FIG. 2 is a comparative photograph of Example 2 and Comparative Example 1. FIG. 2 is a comparative photograph of Example 3 and Comparative Example 1. FIG. 2 is a comparative photograph of Example 4 and Comparative Example 1. FIG. 2 is a comparative photograph of Example 5 and Comparative Example 1. FIG. 2 is a comparative photograph of Example 6 and Comparative Example 1. FIG. 2 is a comparative photograph of Example 7 and Comparative Example 1. FIG. 6 is a comparative photograph of Example 8 and Comparative Example 2. 10 is a comparative photograph of Example 9 and Comparative Example 3. 3 is a comparative photograph between Comparative Example 4 and Comparative Example 1. 6 is a comparative photograph of Comparative Example 5 and Comparative Example 1. 6 is a comparative photograph between Comparative Example 6 and Comparative Example 1.

  Hereinafter, specific embodiments of the present invention will be described. The coating method of the present invention is a multi-colored pattern in which a base paint is applied to the entire painted surface, and then a top coat paint of a color different from that of the base paint is partially applied so that unpainted portions (non-painted portions) are scattered. In order to make the unevenness attributed to the coating marks and the boundary step at that time inconspicuous, a clear paint containing a predetermined flat colored material is applied repeatedly.

  The base material to be painted is not particularly limited, and can be applied to concrete, mortar, PC panel, ALC panel, slate, siding board, and the like. Among them, a ceramic siding material having a design with large unevenness and a jointed design is preferable. This is because it is possible to finish the design utilizing the design appearance. However, in the present invention, the relatively large unevenness originally formed on the substrate is not made inconspicuous, but the relatively small unevenness in the coating film is made inconspicuous. Therefore, a base material having a flat surface is also the object to be coated, and even when the base material itself originally has irregularities, the top coat may be applied partially regardless of the original irregularities of the base material. In other words, in the present invention, even when the substrate itself originally has irregularities, the top coat paint is applied including the recesses. In addition, before applying a base coating material, the preliminary coating material suitable for a base material can also be applied as needed.

(Undercoating)
The base coating material for the base coating can be used without particular limitation as long as it is a common coating material conventionally used when coating the outer wall of a detached house. Specifically, a water-based paint or a solvent-based paint may be used, and its basic composition and color are not questioned. The base paint is generally applied so that the dry film thickness is 0.01 to 0.5 mm. As the coating method, a conventionally known coating method can be used without any particular limitation. For example, the coating may be performed using a roller, a brush, a spatula, a sponge, or the like, or spray coating may be performed. Among them, it is preferable that the viscosity is adjusted so that coating with a commonly used wool roller is facilitated, and the dry film thickness is 0.02 to 0.2 mm. In addition, when the base layer formed by drying the base coating has surface irregularities due to the coating marks, the dry coating thickness of the base coating means the average thickness of the coating film. The base paint is applied to the entire painted surface of the base material to be applied.

(Top coating)
After applying the base coating, a multicolor pattern is formed by partially overcoating the top coating on the base coating (surface). The top coat can also be used without particular limitation as long as it is a general paint conventionally used for painting the outer wall of a detached house, and may be a water-based paint or a solvent-based paint.

  The color of the top coat is different from that of the base paint. This is because if the top coating is the same color as the base coating, there is no point in overcoating and a multicolor pattern cannot be formed. Note that a colored clear paint colored with a pigment, a dye, or the like can also be used as the top coat. In general (non-clear) top coating, the base color is obscured by overcoating. However, if a colored clear coating is used as the top coating, the base color is not completely hidden. It can be finished in a color (texture) that overlaps the top coat color.

  The top coat is also applied over the base coating over the entire painted surface, but is applied so that the unpainted areas are partially scattered. As the coating method, it can be applied using a roller, brush, spatula, sponge, etc. as with the base coating, or it can be spray-coated, but the unpainted part is partially scattered by darely applying it. By partially masking, the unpainted portion can be scattered. In addition, if you use a roller with multiple island-shaped paint parts (paint adhesion parts) protruding and scattered, the unpainted part will be formed by simply painting in the same way as a general roller. To preferred.

  The top coating material preferably has a dry film thickness as small as possible within a range in which a variety of patterns can be expressed. This is because if the dry film thickness is too large, the boundary step between the coated portion and the unpainted portion becomes large, and the unevenness is greatly conspicuous. Specifically, the dry film thickness of the top coating is preferably less than 500 μm, more preferably 450 μm or less, and still more preferably 400 μm or less. In addition, when the topcoat layer formed by drying the topcoat has surface irregularities due to the coating marks, the dry film thickness of the topcoat means the average film thickness of the topcoat, and the dry film thickness of this topcoat Is defined as a step (height difference) between the overpainted portion and the unpainted portion. On the other hand, the lower limit of the dry film thickness of the top coating material is not particularly limited because it is desired that the step difference between the coated portion and the unpainted portion is as small as possible. If it is a general coating method, the dry film thickness of the top coat is 10 μm or more.

  The difference in height of the surface irregularities (the difference between the maximum height and the minimum height) in each of the undercoat layer and the topcoat layer, and the difference in level between the overlying part and the unpainted part are ideally zero. As a result, even a slight surface irregularity due to the coating mark is formed, and as long as overcoating is performed, a step between the overcoating portion and the unpainted portion inevitably occurs. In the present invention, since the object is to make the unevenness caused by such coating marks and overcoating as inconspicuous as much as possible, the surface unevenness in each of the undercoat layer and the overcoat layer and the step difference between both layers should be as small as possible. preferable. Specifically, the height difference of the surface irregularities caused by the coating marks in each of the undercoat layer and the topcoat layer is preferably 600 μm or less, more preferably 400 μm or less, and even more preferably 200 μm or less. Also, the step between the coating overlap portion and the unpainted portion is preferably less than 500 μm, more preferably 450 μm or less, and even more preferably 400 μm or less.

(Clear paint)
After forming a multicolored pattern by partially overcoating the topcoat on the base coating, a clear paint containing a predetermined flat colored product is applied over the entire multicolored pattern (surface). The clear coating material (before blending the flat colored material) that is the base of this coating material is not particularly limited as long as it is a clear coating material that has been conventionally used in this kind of field. It may be a transparent clear paint or a colored clear paint.

  The main components (base materials) of clear paint are acrylic resin, acrylic styrene resin, acrylic silicon resin, silicone resin, urethane resin, fluororesin, chlorinated vinyl resin, vinyl acetate resin, epoxy resin, melamine resin, alkyd resin, polyester It is a synthetic resin such as a resin or a modified product thereof. These base materials may be used alone or in combination of two or more. In addition, those obtained by dissolving these base materials in an organic solvent, or those obtained as an aqueous dispersion as an emulsion obtained by emulsion polymerization in water are used. Among these, acrylic resin-based or acrylic silicon resin-based synthetic resin emulsions are preferable from the viewpoint of ease of handling, safety, coating film performance, cost, and the like.

  The resin solid content in the clear coating is preferably 20 to 60% by weight, more preferably 25 to 55% by weight, and more preferably 30 to 50% by weight. If the resin solid content in the clear coating is too small, it may be difficult to ensure a certain dry film thickness, and it may be difficult to obtain an effect of making the unevenness in the multicolored pattern inconspicuous. On the other hand, if the resin solid content in the clear paint is too large, the paint viscosity becomes too high, making it difficult to paint, or reducing the stability of the paint.

  In addition, for clear coatings, viscosity modifiers, dispersants, antifoaming agents, antiseptics, fungicides, UV absorbers, light stabilizers, gloss adjustments are necessary as long as the effects of the present invention are not impaired. An agent or the like can also be blended.

  In addition, this clear paint is blended with a flat colored material to make the unevenness of the multicolored pattern inconspicuous. A colored product that is not flat is not preferred because it protrudes from the surface of the coating film during formation of the coating film and may impair the smooth texture of the surface. The flat colored material is dispersed almost parallel to the plane direction in the clear coating film. As the flat colored product, silica sand, glass or ceramic pulverized product, colored product such as mica powder, plastic material color chips, colored gel particles, or the like can be used. Among these, colored mica is particularly preferable because it is excellent in flatness and can be easily formulated into a coating composition.

The average particle size of the flat colored product is 0.1 to 2.0 mm, preferably 0.12 to 1.5 mm, and more preferably 0.15 to 1.0 mm. If the particle size of the flat colored product is too small, it is difficult to obtain the effect of making the unevenness in the multicolored pattern visually inconspicuous. On the other hand, if the particle size of the flat colored product is too large, the presence of the flat colored product is conspicuous, and the texture of the multicolored pattern is impaired. The bulk specific gravity of the flat colored product is preferably about 0.2 to 0.7 g / cm ³ .

  The blending amount of the flat colored product is 0.05 to 2.0 parts by weight, preferably 0.07 to 1.8 parts by weight, more preferably 100 parts by weight of the paint before blending the flat colored product. 0.1 to 1.5 parts by weight. When the amount of the flat colored material is too small, it is difficult to obtain an effect of visually conspicuous unevenness in the various patterns. On the other hand, if the amount of the flat colored material is too large, the texture of the multicolored pattern is impaired.

  The clear paint blended with a flat colored product has a dry film thickness of 10 to 200 μm, preferably 20 to 150 μm. If the film thickness (coating amount) of the clear paint is too small, it is difficult to obtain an effect of visually conspicuous unevenness in various patterns. On the other hand, if the clear coating film thickness (coating amount) is too large, the texture of the multicolored pattern is impaired.

  The clear paint blended with the flat colored material may be applied with a roller, a brush, or the like, as in the case of the base paint or top coat, and can also be spray-coated. In the case of using a colored clear paint, it is possible to further increase variations of various patterns by using a color different from that of the base paint or the top coat.

  In the present invention, by applying a clear paint containing a flat colored product on the entire surface of the multicolored pattern, the coating effect on the multicolored pattern and Unevenness due to the boundary step between the painted portion and the unpainted portion becomes inconspicuous. As a result, it is possible to express a multicolored pattern with a flat and natural texture (appearance) while taking advantage of the multicolored pattern in which the unpainted portions are scattered.

  Note that the unevenness to be made inconspicuous in the present invention is not the unevenness originally formed on the base material as a kind of design (referred to as design unevenness for the sake of explanation), but originally intended to be flat, but with the painting Unevenness that has inevitably occurred (referred to as coating unevenness for convenience of explanation). Therefore, the design irregularities that are not the subject of the present invention can be recognized from a relatively distant position, but the coating irregularities that are the subject of the present invention are present only from a relatively close position. It is difficult to recognize, and almost no unevenness can be felt when viewed from a distance. Similarly, since the flat colored product is fine and contains only a predetermined amount, its presence can be recognized from the position where the unevenness due to the coating unevenness can be felt, but it is difficult to feel the spot when viewed from a distance.

  Examples of the present invention will be described below, but the present invention is not limited to the following examples. The raw materials shown in Table 1 were sequentially added to a plastic container having a capacity of 1.5 liters in the ratio shown in Table 1 (unit: g), and stirred with a dispersion at room temperature for 10 minutes to prepare clear coating compositions 1-10.

The raw materials shown in Table 1 were as follows.
Synthetic resin emulsion: Pegar 751 (manufactured by High Pressure Gas Industry Co., Ltd., acrylic silicone resin, nonvolatile content 45% by weight)
Film forming aid: TEXANOL (2,2,4-trimethylpentane-1,3-diol monobutyrate)
Pigment dispersant: Demol EP (manufactured by Kao Corporation)
Extender pigment: MZ-30H (manufactured by Soken Chemical Co., Ltd., acrylic resin beads)
Antifoaming agent: Adecanate B556 (manufactured by ADEKA)
Viscosity imparting agent: Adecanol UH540 (manufactured by ADEKA)
Black mica A: Cerachip SC-30 black (manufactured by Hokuto Sangyo Co., Ltd., average particle size 150 μm, bulk specific gravity 0.45 to 0.55)
Black mica B: Cerachip SC-50 black (manufactured by Hokuto Sangyo Co., Ltd., average particle size 355 μm, bulk specific gravity 0.40 to 0.50)
Black mica C: Cerachip SC-200 black (manufactured by Hokuto Sangyo Co., Ltd., average particle size 1.0 mm, bulk specific gravity 0.35 to 0.45)
Black mica D: Cerachip SC-500 black (manufactured by Hokuto Sangyo Co., Ltd., average particle size 4.5 mm, bulk specific gravity 0.25 to 0.35)
Black Mica E: Cerachip SC-30 Black classified by a mesh with a mesh size of 74μm (grain size less than 74μm)
White mica: Cerachip SC-200 white (manufactured by Hokuto Sangyo Co., Ltd., average particle size 1.0 mm, bulk specific gravity 0.35 to 0.45)

SPCC-SB (cold rolled steel sheet bright finish) measuring 90mm in length x 210mm in width x 0.8mm in thickness is used as the coating substrate to measure the coating film thickness with an electromagnetic film thickness meter after painting. It was. After degreasing this, a preliminary paint (manufactured by Suzuka Fine Co., Ltd., water-based rasnon EPO) was applied to the entire surface with a wool roller middle hair so that the coating amount was 100 g / m ^2, and after drying, a base paint (Suzuka Fine ( Co., Ltd. (Burete matte beige color) diluted 5% with water was uniformly coated with wool roller middle hair so that the coating amount was 120 g / m ² .

After drying, a 30 mm wide architectural coating masking tape (manufactured by Nitto Denko Corp.) is longitudinally spaced every 30 mm (two 30 mm apart from both ends of the plate and one in the center of the plate). (3 sheets) After pasting, a 5% dilution of the top coating (made by Suzuka Fine Co., Ltd., frosted frosted cream) with water, using a wool roller middle hair, the coating amount is 270 g / m ² The coated plate was coated with a two-color pattern in the form of vertical stripes by coating the entire surface in such a manner and immediately peeling off the masking tape. As a result of measuring the film thickness after drying, the unevenness difference due to the coating mark of the top coating was 120 μm, and the step between the top coating color part (coating part) and the base color part (unpainted part) was 110 μm. This is a two-color pattern coating plate A.

  Also, in the same manner as the two-color pattern coating plate A, apply a dark brown base paint (made by Suzuka Fine Co., Ltd., au matte dark brown) and a brown top coat (made by Suzuka Fine Co., Ltd., au matte matte brown). The used coating board is produced and this is made into 2 color pattern coating board B. As a result of measuring the film thickness after drying, the unevenness difference due to the coating mark of the top coat was 120 μm, and the step difference between the repeated coating portion and the unpainted portion was 110 μm.

Next, apply the base paint in the same way as the two-color pattern-coated board A, and apply 2% of the top coat paint (made by Suzuka Fine Co., Ltd., frosted frosted cream) to the coated board with masking tape. The diluted one is applied to the entire surface using a sand aggregate roller coarse grain so that the applied amount is 1070 g / m ^2, and the masking tape is peeled off immediately to give a two-color pattern coating in the form of vertical stripes. A plate was made. As a result of measuring the film thickness after drying, the unevenness difference due to the coating mark of the top coating was 380 μm, and the step difference between the repeated coating portion and the unpainted portion was 250 μm. This is a two-color pattern coating plate C.

Furthermore, in the same manner as the two-color pattern coating plate C, apply the top coating to the entire surface so that the coating amount is 1620 g / m ^2, and immediately remove the masking tape to apply the two-color pattern coating in the form of vertical stripes. A coated plate was prepared. As a result of measuring the film thickness after drying, the unevenness difference due to the coating mark of the top coat was 580 μm, and the step difference between the repeated coating portion and the unpainted portion was 400 μm. This is a two-color pattern coating plate D.

Subsequently, a clear paint containing a flat colored aggregate prepared according to Table 1 was applied to each two-color pattern coated plate using a wool roller middle hair so as to be 100 g / m ^2. Thus, each example and each comparative example were prepared. Examples 2 to 6 are coating plates obtained by coating the two-color pattern coating plate A with the clear coatings 1 to 6 in Table 1 and drying them. Example 7 was obtained by coating the two-color pattern coating plate B with the clear coating 7 shown in Table 1. Example 8 was obtained by applying the clear paint 6 shown in Table 1 to the two-color pattern coating plate C. Example 9 was obtained by coating the two-color pattern coating plate D with the clear coating 6 shown in Table 1.

  Finally, the two-color pattern-coated plates A, C, and D, which are not coated with the clear paint, are referred to as Comparative Examples 1, 2, and 3, respectively, and the two-color pattern-coated plate A is coated with the clear paints 8 to 10 shown in Table 1 These were made into Comparative Examples 4-6. Tables 2 and 3 list the examples and comparative examples.

<Result>
Table 4 shows the evaluation criteria for the effect of applying each clear paint of Table 1 to the reference board (Comparative Example 1) that is not coated with clear paint, and Table 5 shows the evaluation results. Are described in FIGS. In addition, the evaluation item “relaxation of unevenness of paint marks” is the degree to which the paint marks of the top coating are not visually noticeable when viewed from the position where the unevenness due to the paint marks and boundary steps is felt Means. In addition, “relaxation of the unevenness caused by the boundary step” means a linear shape due to the boundary step between the overpainted portion and the unpainted portion as seen from the position where the unevenness due to the coating mark and the boundary step is felt. This means the degree to which shading is visually inconspicuous. On the other hand, “colorful pattern hindrance” refers to the presence of flat colored objects that interfere with the original design of the multicolored pattern when viewed from a remote location where the impression of unevenness due to the paint marks and boundary steps is not felt at all. Means the degree of Further, regarding the evaluation results shown in Table 5, Comparative Examples 1 to 3 are out of evaluation because they are plates not coated with a clear paint.

  From Table 5 and each result photograph (figure), in Examples 1 to 9, the impression of unevenness was alleviated by the fact that the coating marks of the top coat became visually inconspicuous. In addition, the unevenness attributed to the boundary step between the overpainted portion and the unpainted portion became visually inconspicuous, and a flat and natural texture (appearance) was obtained.

On the other hand, when the flat colored aggregate in the paint was 3 parts by weight as in Comparative Example 4, the colorful pattern was darkened as a whole, and the original color was greatly impaired. When the average particle size of the flat colored aggregate was 4.5 mm as in Comparative Example 5, the presence of the flat colored aggregate was too conspicuous and the original design of the multicolored pattern was impaired. When the particle size of the flat colored aggregate was less than 100 μm as in Comparative Example 6, the multicolored pattern was darkened as a whole, and the original color was impaired.

Claims (1)

After applying the base paint to the entire painted surface, partially coat the top coat paint different in color from the base paint so that the unpainted area is scattered,
Further, a clear paint containing 0.05 to 2.0 parts by weight of a flat colored product having an average particle size of 0.1 to 2.0 mm based on 100 parts by weight of the paint before blending the flat colored product, A multi-pattern coating method that applies over the entire painted surface.