JPH0470954B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for forming a coating film with a multicolored relief pattern having deep irregularities.

[Industrial application field]

Relief pattern coatings are widely used in various fields, including architectural exterior and interior applications.

[Conventional technology]

Traditionally, typical methods for forming relief patterns include (1) printing, (2) silk screen process, (3) etching, and (4)
Methods such as embossing and (5) spraying a multi-layer pattern spraying material with a spray gun are known.

Although method (1) has the feature that patterns and colors can be freely selected, it is difficult to obtain a three-dimensional pattern with sufficient thickness, and the resulting coating film is generally It had a flat finish.

In addition, method (2) leaves a mesh on the pattern surface, and if the coating is thick, it is difficult to express delicate lines, complex, and fine patterns, and the screen may become clogged and the surrounding areas may smear, resulting in the pattern being distorted. It looked inferior and was not suitable for high-grade finishing.

Furthermore, method (3) is limited to materials that can be etched with a corrosive solution, and handling of the corrosive solution is also troublesome.

Furthermore, although method (4) is suitable for mass production in factories, it is not suitable for applying different patterns to individual products.

Although method (5) is optimal for forming a random uneven pattern, it has the disadvantage that it cannot form specific patterns such as designs and letters.

As mentioned above, each of the conventional methods has its advantages and disadvantages.

Therefore, in recent years, as an alternative to these conventional methods, a method has been proposed in which a coating film with a clear, non-random, arbitrary (non-uniform) embossed pattern is formed on an arbitrary base material.

That is, the method involves applying a photocurable coating composition to a thickness of about 30 to 50 microns on a substrate, masking a part of the coated surface with a light-opaque substance, or masking it with a light-transparent pattern. It consists of closely adhering a light-opaque sheet, then irradiating it with ultraviolet rays to cure the coating in the exposed areas, and then removing the coating in the uncured areas to form a relief pattern coating. .

However, this method does not allow for thick coating (e.g., several hundred microns or more) due to the properties of the photocurable coating composition or from a cost perspective. It had the disadvantage that it could not be made deep and could not form a multicolored uneven pattern.

[Problem that the invention seeks to solve]

In view of the current state of the art in the field of embossed pattern coatings as described above, the present inventors have discovered the characteristics of a method for forming embossed pattern coatings using the photocurable coating composition (clear and random coatings on any substrate). The present invention was developed as a result of intensive research into a method for forming a multicolored embossed pattern coating film that has deep unevenness while also being able to form a coating film with an arbitrary embossed pattern that is not a pattern.

[Means for solving problems]

That is, the present invention comprises: () a step of overcoating a plurality of water-based putties of different colors on a base material to form a plurality of putty layers of different colors with a dry film thickness of about 0.5 to 20 mm; () on the putty layer; A process of overcoating a light (ultraviolet) curable coating composition, () A sheet with a pattern formed of a light-transmitting part and a light-impermeable part is brought into close contact with or in close proximity to the coating film, and ultraviolet rays are applied from above. irradiate,
a step of curing the paint film in the exposed area; () After removing the sheet, use water or a cleaning liquid mainly composed of water to cure the uncured part of the paint film and a portion of the exposed putty layer underneath; Or, it relates to a method for forming a multi-colored embossed pattern coating film having deep unevenness, which is a step of removing all of the putty layer and forming recesses of uneven depth by adjusting the degree of removal of the putty layer. be.

In the method of the present invention, the photocurable coating composition that has been irradiated with ultraviolet rays forms a pattern consisting of cured areas and uncured areas in accordance with the pattern of the sheet consisting of light-transmitting areas and non-light-transmitting areas. Form. That is, only the part of the coating film exposed to ultraviolet light under the light-transmitting part is cured, and the part of the coating film under the light-opaque part not exposed to ultraviolet light is not cured.

In the present invention, in the subsequent removal step, not only the uncured coating film but also the underlying (exposed) putty layer is removed. On the other hand, the putty layer below the cured coating is protected by the cured coating and is therefore not removed. Therefore, it has the advantage of being able to form an embossed pattern coating film that has a sharp shape according to the pattern of the sheet and has deeper unevenness than that of a coating film alone.

In addition, in the present invention, by appropriately controlling the thickness of the putty layer and the degree of removal,
It has the advantage of being able to freely form embossed pattern coatings with unevenness of desired depth, not only those with shallow unevenness, but also those with deep unevenness. In addition, since multiple putty layers with different colors are formed, when removing the putty layer, by adjusting the degree of removal at each location, that is, the depth of the recess, it is possible to create multi-colored changes depending on the depth. It has the advantage of being able to freely form an embossed pattern coating with multicolored unevenness. Furthermore, the method of the present invention has the advantage that since most of the coating film forming the embossed pattern consists of a putty layer, it is possible to form a embossed pattern coating film with deep unevenness at a very low cost. has.

Hereinafter, the method for forming a relief pattern coating film having unevenness according to the present invention will be explained in more detail.

First, any known base material can be used as the base material used in the present invention. Examples include metals such as iron, aluminum, and stainless steel, glass, tiles, ceramics, concrete, bricks, stones, wood, leather, and plastics. The surface does not necessarily have to be flat,
For example, it may be a curved surface. These base materials can also be subjected to surface treatment, coloring treatment, etc., if necessary.

A water-based putty is applied onto these base materials and dried. As the water-based putty used in the present invention, water-based putty that has been conventionally available on the market can be used as is.
Specifically, for example, 3 to 20 parts of vinyl acetate resin emulsion, acrylic resin emulsion, vinyl chloride resin emulsion, calcium carbonate,
Consists of 30 to 80 parts of pigments consisting of extender pigments such as talc, silica, barium sulfate, kaolin, clay, diatomaceous earth, mica, etc., and various coloring pigments as necessary, as well as thickeners, antifoaming agents, preservatives, wetting agents, etc. It is a composition consisting of 0.1 to 10 parts of various additives and an appropriate amount of water.
It is also possible to add an appropriate amount of cement or the like to appropriately increase the water resistance and hardness of the water-based putty. In the present invention, such aqueous putty is applied to a dry film thickness of 0.5 to 20 mm using a trowel, a spatula, or the like, and then force-dried at room temperature or 50 to 80°C. Even if it is not completely dry, it is sufficient as long as it does not deform when pressed strongly with your fingers.

The water-based putty layer is formed by applying water-based putties of different colors multiple times. By forming a plurality of water-based putty layers with different colors in this way, the degree of removal at each location when removing the water-based putty layer underlying the uncured photocurable coating composition coating film can be improved in the removal process described below. In other words, by adjusting the depth of the recessed portions, it is possible to form a multicolored embossed pattern coating film with unevenness that changes in multiple colors depending on the depth.

In the present invention, a water-based sealer may be applied to the surface of the water-based putty layer formed as described above, if necessary. The water-based sealer is particularly effective in preventing loss of the applied photocurable coating composition due to absorption in the water-based putty layer, which has strong liquid absorption properties. As the water-based sealer, for example, a composition in which the resin content of the water-based putty is increased can be used.

In the present invention, the photocurable coating composition is applied by means such as spraying, brushing, roll coater, flow coater, etc. to a dry film thickness of about 20 to 50 microns.

As the photocurable coating composition used in the present invention, those commonly used in the past can be used as they are. Specifically, for example, polymers such as unsaturated polyester resin, acrylic resin, polyester-acrylic prepolymer, epoxy-acrylic prepolymer, acrylic oligomer, polyurethane resin, styrene, methacrylic ester, acrylic ester, acrylonitrile, etc. A composition comprising a photopolymerizable monomer, a photosensitizer such as benzoin, 2-methylanthoraquinone, diacetyl, benzophenone, methyl phenylglyoxylate, and, if necessary, a solvent, additives, etc. It is. When the composition contains volatile components such as a solvent, it is preferable to proceed to the next step after removing the volatile components.

In the method of the present invention, a sheet having a pattern formed of light-transmitting portions and light-impermeable portions is placed in close contact with or in close proximity to the photocurable coating composition.

As the patterned sheet, for example, a sheet formed on a light-transmitting sheet by electrophotography, diazophotography, thermophotography, etc. can be used. Further, it is also possible to use a material in which a pattern such as a design, a picture, a character, etc. is formed by pasting a light-opaque material such as paper, cloth, or plastic.

Next, ultraviolet rays with a wavelength of about 150 to 400 nm are irradiated through the patterned sheet using a high-pressure mercury lamp, a low-pressure mercury lamp, a chemical lamp, or in some cases sunlight, etc., to coat the photocurable coating composition under the light-transmitting part of the sheet. Cure the film. In the present invention, it is particularly preferable to use a low-pressure mercury lamp that does not generate high heat. Use of the low-pressure mercury lamp, which does not generate high heat, prevents the coating film in unexposed areas from undergoing a curing reaction due to heat. Therefore, the boundary between exposed and unexposed parts of the coating film is not blurred, and a sharp uneven pattern corresponding to the pattern formed on the sheet can be obtained.

In the present invention, the sheet is removed, followed by removal of a portion or all of the uncured photocurable coating composition coating and the underlying putty layer.

The removal method is to use a cleaning solution consisting of water or water as a main component and to which other solvents, surfactants, etc. are blended as necessary, and to scrub with a rotating brush, or to spray the cleaning solution at high pressure. methods etc. can be adopted.

In this way, a multicolored embossed coating film with deep irregularities is obtained. In the present invention, it is also possible to add color and adjust the glossiness, if necessary. Furthermore, in order to impart weather resistance, water resistance, chemical resistance, etc., a coating film such as clear or color clear can be applied to the entire surface or the concave portions (or convex portions).

As described above, by the method of the present invention, it is possible to easily and inexpensively obtain a coating film with various embossed patterns having deep irregularities of any depth. Furthermore, by varying the pattern formed on the sheet, a desired uneven pattern can be easily obtained.

Hereinafter, the present invention will be explained in more detail with reference to Examples.

In the examples, "parts" and "%" are based on weight.

Example 1 10 parts of vinyl acetate emulsion (NV60%), 19 parts of cellulose thickener (NV40%), silica sand (200 mesh pass) were placed on an asbestos slate board (900 x 1800 x 10 mm) coated with acrylic emulsion sealer. ) 50 parts, talc (330 mesh pass) 10 parts, antifoaming agent 0.2 parts, dispersing agent 0.2 parts, preservative 0.02 parts and water 10 parts
A water-based putty consisting of 50% of the total weight was applied with a trowel and dried at 60°C for 30 minutes to form a 3mm thick putty layer. Then, in the same manner, vinyl acetate emulsion (NV60%) 10
19 parts of cellulose thickener (NV40%), 43 parts of silica sand (200 mesh pass), 43 parts of talc (330 mesh pass), 7 parts of Oriental Red, additives
A water-based putty (red) consisting of 0.5 parts and 10 parts of water was applied with a trowel, dried, and a red putty layer with a thickness of 1.5 mm was laminated.

After lightly sanding the resulting putty layer with #120 paper,
Furthermore, the water-based putty was thinly spread over the entire surface with a spatula and dried at 60° C. for 16 minutes.

Furthermore, 60 parts of epoxy acrylate prepolymer, 20 parts of polyester acrylate, 2-
A photocurable coating composition consisting of 18 parts of ethylhexyl acrylate and 10 parts of a 20% xylene solution of benzyl dimethyl ketal was applied by spray (200 g/m ² ) and allowed to stand at room temperature for 10 minutes.

Next, a sheet (a 50 μm thick transparent polyester film with a light-impermeable pattern drawn on it) was lightly pressed with a roll onto the photocurable coating composition coating to bring it into close contact.

Next, using a low-pressure mercury lamp from 250 mm above, ultraviolet light [wavelength 230 to 350 nm (peak 255 nm) was applied.
m); Lamp output 1W/cm; Energy 18mw/
cm ² ] for 20 seconds.

After irradiation, the sheet was removed and the surface of the coating was brushed with a circular brush (φ100 mm) consisting of bundles of nylon (diameter 0.6 mm) rotating (250 rpm) at a rate of 10 minutes/ ^m2 while pouring water (30/min). ) to remove the uncured paint film and a portion of the putty layer underneath, drain and dry.

The resulting surface has a pattern that corresponds to the design of the sheet.
Asperities with an average depth of about 2 mm were formed.

Next, the entire surface was painted with acrylic lacquer color clear.

The surface of the coated object thus obtained had an extremely embossed relief pattern consisting of two colors.

Example 2 On plywood (600 x 400 x 10 mm) that had been treated with a two-component urethane sealer and whose surface was further coated with a two-component urethane paint (gray), a water-based putty (gray) with the following composition was applied approximately 1 mm thick. Trowel paint so that it becomes 40
It was dried at ℃ for 2 hours. Next, in the same manner, water-based putty (green), water-based putty (yellow), water-based putty (red), and water-based putty (beige color) consisting of the following compositions were prepared in order:
was troweled and dried to form a putty layer with a thickness of 5 mm consisting of five layers of gray, green, yellow, red, and beige colors.

<Water-based putty (gray)> Vinyl acetate emulsion (NV60%)...10 parts Cellulose thickener (NV40%)...19 parts Silica sand (200 mesh passes)...43 parts Talc (330 mesh passes)...10 parts Titanium oxide...6 parts Carbon black...1 part Additives...0.5 parts Water...10 parts <Water-based putty (green)> When preparing water-based putty (gray), substitute Phthalocyanine Green 7 for titanium oxide and carbon black. <Water-based putty (yellow)> In the composition of water-based putty (gray), use 7 parts of iron oxide (yellow) instead of titanium oxide and carbon black <Water-based putty (red)> Composition of water-based putty (gray) Medium, using 7 parts of Oriental Red instead of titanium oxide and carbon black <Water-based putty (beige color)> In the composition of water-based putty (gray), iron oxide (yellow) and iron oxide instead of titanium oxide and carbon black Use 7 parts of a (1:1) mixture of (rust) Next, after lightly sanding the putty layer with #240 paper,
Furthermore, the water-based putty (beige color) was thinly spread over the entire surface with a spatula and dried at 40°C for 2 hours.

Then a photocurable coating composition consisting of 80 parts of epoxy acrylate prepolymer, 18 parts of tetraethylene glycol acrylate and 10 parts of a 20% xylene solution of benzyl dimethyl ketal was applied by spraying (200 g/m ² ) thereon. It was left at room temperature for 5 minutes.

Next, a sheet (a transparent polyester film having a thickness of 38 μm with a light-impermeable pattern drawn on it) was lightly pressed onto the photocurable coating composition coating film to bring it into close contact.

Next, ultraviolet rays were irradiated under the same conditions as in Example 1.

After removing the sheet, the surface of the coating was soaked for 3 to 30 minutes while pouring hot water at 60°C (30/min).
Random time for each location at a rate of 10min/ ^m2 ,
It was rubbed with a rotating (260 rpm) circular brush similar to that used in Example 1 to remove a portion of the uncured coating film and the underlying putty layer, followed by draining and drying. Next, an acrylic lacquer clear was applied to the entire surface.

The surface obtained in this way has irregularities corresponding to the design, and the recesses have various colors such as gray, green, yellow, red, and beige depending on their depth, creating a relief with an extremely embossed feel. A pattern was obtained.

Claims (1)

[Claims] 1 () A step of layering a plurality of water-based putties of different colors on a base material to form a plurality of putty layers of different colors with a dry film thickness of about 0.5 to 20 mm, () The putty layer A step of forming a coating film by overcoating a photocurable coating composition on top of the coating film, () adhering or adjoining a sheet having a pattern consisting of a light-transmitting part and a light-impermeable part to the over-coating film; , then curing the exposed portions of the coating film by irradiating ultraviolet rays from above; () After removing the sheet, use water or a cleaning solution mainly composed of water to cure the uncured portions of the coating film and A step of removing part or all of the underlying putty layer, and forming recesses of uneven depth by adjusting the degree of removal of the putty layer. A method for forming a coating film having a multicolored relief pattern.