JPH052514B2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a method for manufacturing a three-dimensional multicolored pattern coated plate using a screen printing method, and in particular, the entire surface of the substrate including uneven portions is porous or has fine unevenness. The present invention relates to a method that can form a coated plate with a suitable three-dimensional multicolored pattern when applied to a substrate.

<Prior art> It has been widely used to apply multicolored patterns to substrates for construction materials having uneven surfaces, and these methods include printing directly on the substrate using gravure printing, offset printing, offset gravure printing, etc. ) Alternatively, a method (b) is known in which a raised print is applied to the substrate by screen printing and then printed on it by a printing means such as gravure, offset, or offset gravure.

<Problems to be solved by the invention> However, method (a) requires that the substrate surface be smooth and
It is suitable for substrates that do not absorb paint, but if the substrate surface is porous or has minute irregularities, uneven suction or paint concentration may occur, making it impossible to print uniformly. There was a problem in that the surface had to be made smooth and free of paint absorption by performing complicated surface treatment such as sealing, polishing, and base coat application in advance.

In addition, method (b) can be applied to substrates whose surfaces are porous or have minute irregularities up to the printing process by screen printing, but the height of the resulting screen printed coating film may vary depending on the substrate surface condition. If you print on the coating film in such a state by gravure, offset, offset gravure, etc., uneven paint transfer and uneven paint density will occur due to the difference in printing pressure. There was a problem in that it had to be smooth and free of paint absorption.

As a result of intensive studies in view of the current situation, the inventors of the present invention have found that, by a method using a combination of appropriate screen printing methods, the base material can be coated even when the surface of the base material has a porous surface or a base material with fine irregularities. The present invention has been achieved by discovering a method for producing a uniform three-dimensional multi-patterned painted plate without uneven paint transfer or uneven paint density even without performing any treatment, or even without accurate base treatment even if it is performed. .

<Means for solving the problems> That is, the present invention has a porous or finely uneven surface,
After applying a base color coating as necessary on the substrate having a patterned uneven surface, apply a screen plate having a mesh number of 100 meshes or less to all or part of the convex portions of the patterned uneven surface. , screen-print a colored ultraviolet curable paint containing transparent glass beads to form a first screen-printed coating;
A three-dimensional multi-pattern coated plate characterized in that a second screen-printed coating film is formed by partially screen-printing a paint of a different color from the ultraviolet curable paint using a screen plate having a mesh number greater than or equal to the number of meshes. The present invention relates to a manufacturing method.

The present invention will be explained in detail below.

Substrates used in the present invention include porous substrates, such as inorganic boards such as concrete, slate, and stone; wood boards such as particle boards and hard boats; and various inorganic boards, wood boards, and metal boards with fine irregularities. Typical examples include plastic boards, etc., and these boards have a pattern-like uneven surface due to embossing, molding, engraving, etc., and the protrusions have approximately the same height. be.

It goes without saying that a smooth substrate with a porous surface or without fine irregularities can also be used in the present invention.

In addition, for porous substrates and substrates with fine irregularities, fill the porous parts and fine concave parts as necessary.
Polishing treatment and base coat coating treatment may be applied, but it is not necessary to completely smooth the surface or completely prevent paint from being sucked in as in conventional methods.

In addition, when it is desired to apply the desired coloring to the concave or convex portions of the base material having a patterned uneven surface that are not pattern elements of the first screen printing plate, that is, the exposed surface where the first screen printing coating is not applied, the substrate A base color coating may be applied in advance to the substrate, and if the fabric of the substrate itself is to be used as a part of the pattern element, it is not necessary to apply the base color coating.

A multicolored pattern is applied to the entire or part of the convex portion of the substrate having such a patterned uneven surface by a screen printing method.

In addition, the screen printing method uses a squeegee to move the paint over a screen plate with a suitable number of meshes, which hides areas other than the necessary pattern areas with resin, etc., and prints out the mesh of the gauze in the pattern areas that are not hidden. This is a method in which a raised pattern coating film is formed by pouring paint into the surface and then raising the screen plate.

The present inventors have discovered that by using a screen printing method using gauze with a specific number of meshes, even if the substrate surface is porous and has minute irregularities, it can be filled with paint without applying a large load. It was discovered that since it is on the surface of the gauze, a uniform coating level can be maintained by scraping with a squeegee. Note that the above effect cannot be obtained no matter what kind of gauze is used; the amount of coating required to fill the pores on the surface of the substrate is required, and the amount of coating depends on the thickness of the threads that make up the gauze. It's decided by then.

In the present invention, a first screen-printed coating film is formed by screen-printing a paint onto the convex portions of a substrate having a patterned uneven surface using a screen plate having a mesh count of 100 or less, that is, a screen plate having large meshes. By using a gauze having a mesh number within the above range, a smooth coating film can be formed even on a porous or finely uneven substrate without applying an excessive load. The lower limit of the number of meshes is not particularly limited, but if it is too small, it will not be possible to express a delicate pattern coating, so a number of up to about 30 meshes is appropriate.

In addition, if the number of meshes exceeds 100 meshes, 1
Squeezing twice is undesirable because it causes printing to be missing or flying, and the surface of the coating film does not become smooth.

The paint used is an ultraviolet curable paint with a viscosity of about 100 to 400 poise, which can be quickly handled after screen printing, and has a high solids content.

Ultraviolet curable paints contain ultraviolet polymerizable compounds, photopolymerization initiators, colored pigments, and transparent glass beads as essential components, and further include extender pigments, solvents, additives, etc. as necessary.

To explain in more detail, as the "ultraviolet polymerizable compound", a compound having an unsaturated double bond capable of radical polymerization in the molecule is used. Specifically, relatively low molecular weight polyester resin,
Alkyd resins, polyether resins, acrylic resins, epoxy resins, urethane resins, silicone resins, polybutadiene resins, acrylic oligomers or prepolymers, and 2-ethylhexyl (meth)acrylate, 2-hydroxyethyl (meth)acrylate, tetrahydrofurfuryl ( meth)acrylate, dipropylene glycol mono(meth)acrylate, (meth)acrylamide,
Representative examples include reactive monomers such as N-vinylipyrrolidone, triethylene glycol di(meth)acrylate, trimethylolpropane tri(meth)acrylate, and diventaerythritol hexa(meth)acrylate, either singly or in mixtures. Further, as ultraviolet polymerizable compounds, cationic ring-opening polymerizable vinyl-2-ethylhexyl ether, vinyldecyl ether, 1,2-epoxycyclohexane, dicyclopentadiene dioxide, sorbitol polyglycidyl ether, etc. can be used. In addition, as the "photopolymerization initiator", carbonyl compounds such as benzoin, benzophenone or their esters, benzoyl peroxide, azobisisobutyronitrile, diphenyl disulfide, N-methyldiethanolamine,
Representative examples include 2,5-diethoxy-4-(p-tolylthio)benzenediazonium hexafluorophosphite. Coloring pigments include titanium oxide, carbon black, zinc white,
Iron oxide, Bengara, ultramarine, phthalocyanine blue, extender pigments include silica sand, silicates, talc, kaolin, barium sulfate, calcium carbonate, powdered and fibrous glass, polyurethane, and resins such as polyester, polyethylene, and polystyrene. A typical example is powder. Furthermore, typical examples of the "solvent" include toluene, xylol, acetone, methyl ethyl ketone, ethyl acetate, and the like. In particular, in the present invention, transparent glass beads are contained in the paint. The suitable average particle diameter of the transparent glass beads is 30 to 60 μm, and the appropriate amount of the transparent glass beads is 20 to 70% by weight (based on the solid content of the paint). In other words, by including glass beads, the propagation of light energy into the interior of the coating film is carried out smoothly, and therefore the coating film can be sufficiently cured even when the film is thick, and the abrasion resistance of the coating film is further improved. is obtained.

The first screen printed coating film is irradiated with ultraviolet rays using the same method as for drying ordinary ultraviolet curable paint coatings, and after drying, a screen plate having a mesh number of 150 meshes or more on the coating film is applied. A second screen-printed coating film is formed by screen printing a paint of a different color from the ultraviolet curable paint.

By using gauze with a mesh number within the above range, even if the surface of the first screen printing coating film has a somewhat uneven surface, a uniform, sharp, and finely designed multicolored pattern can be formed. It becomes possible to do so.

There is no particular upper limit to the number of meshes, but if they are too large, that is, if the mesh is too small, the paint will not be able to be rubbed in sufficiently, so up to about 350 meshes is appropriate. It should be noted that if it is less than 150 meshes, it becomes difficult to form fine patterns, which is not preferable.

In addition, gravure,
When printing by means such as offset or offset gravure, there is always unevenness in the thickness of the substrate, differences in the amount of ink transfer due to differences in printing pressure, etc., resulting in uneven coloring, etc. Moreover, the use of cylinders increases costs, and therefore it is difficult to print. It is not appropriate for inventions.

The paint forming the second screen printing coating has a viscosity of approximately
Paints of 100 to 400 poise can be used. That is,
Unsaturated polyester-based, acrylic-based, and epoxy-based solvent-free paints; acrylic urethane-based, aminoalkyd-based, urethane-based, and epoxy-based solvent-based paints can be used; however, paints with a low solids content lose diluent when dry. It volatilizes and the surface of the paint film tends to become uneven.
Furthermore, water-based paints have poor leveling and are therefore not suitable. Also suitable are active energy ray-curable paints, such as ultraviolet-curable paints.

FIG. 1 shows an example of a coated plate with a three-dimensional multicolored pattern obtained by the method of the present invention. In the drawings, 1 is a substrate, 2 is a first screen-printed coating, and 3 is a second screen-printed coating.

The three-dimensional multi-pattern coated plate of the present invention is produced as described above, but if necessary, the entire surface or part of the plate can be overcoated with (color) clear.

<Effects of the Invention> With the method of the present invention, even if the surface of the substrate is porous and absorbs paint, or even if the substrate has minute irregularities, it is possible to remove the substrate without any surface treatment or even if the surface of the substrate is porous and can absorb paint. Even after treatment, it is possible to produce a three-dimensional multi-pattern coated plate that is sharp and has excellent design, without the need to completely smooth it and prevent paint from being sucked in as in the conventional method. Furthermore, compared to means such as gravure, offset, and offset gravure, it is cheaper and easier to change colors and make changes.

Hereinafter, the present invention will be explained in more detail with reference to Examples. In the examples, "parts" are expressed on a weight basis.

Example 1 Acrylic urethane resin solvent-based enamel was applied to the surface of a calcium silicate plate having a 100 mm square surface with grooves of 2 mm depth and 2 mm width, the entire surface was porous, and the bulk specific gravity was 0.8. Paint (PWC55
%, ivory color) was spray-painted at 80g/ ^m2 ,
A base color coating was applied. Note that the base color coating film had fine irregularities all over.

Next, a screen with a 60-mesh plain-woven polyester gauze stretched over the tile-like convex portion was placed.
Using a screen plate with a 100 mm square title pattern photoengraved, measure the hardness of an ultraviolet curable paint [viscosity 250 poise (Lyon viscometer)] consisting of the following paint formulation 1.
Scrape and screen print using a 55 degree urethane rubber squeegee.

Next, ultraviolet rays were irradiated for 2 seconds from a distance of 100 mm using a 120 W/cm metal halide lamp (containing Fe and Sn) to form a first screen-printed coating film with an average thickness of 200 μm. Next, on the first screen printing coating film, a urethane acrylate based film was applied using a photolithographic screen plate with a floral pattern that matched the 100 mm square title pattern on a screen covered with 200 mesh plain weave gauze made of polyester. Ultraviolet curing blue paint "A-1 Cure" (trade name, manufactured by Nagase Screen Institute) was scraped off with a urethane rubber squeegee having a hardness of 82 degrees, and screen printing was performed. Next, UV irradiation was performed for 4 seconds under the above conditions to determine the average film thickness.
A second screen printed coating of 10μ was applied.

Next, 80 g/m ² of acrylic urethane resin-based solvent-based clear paint was sprayed on the entire surface to produce a three-dimensional multi-pattern coated plate.

The resulting painted board consists of ivory-colored concave joints and a smooth convex surface shaped like a 100 mm square tile pattern on a white background.Furthermore, a clear and fine floral pattern is printed in blue on the tile pattern, similar to tiles. It was a coated plate with a highly designed finish.

Paint formulation 1 Acrylic urethane oligomer 22 parts N-vinylpyrrolidone 6 parts Acetophenone photopolymerization initiator 2 parts Transparent soda glass beads (average particle size 30μ) 62 parts Zinc sulfide pigment 8 parts Example 2 PVC steel plate with beige matte surface The paint was embossed on the surface of a circular convex part with an unevenness difference of 1.5 mm, and an abstract pattern with a petal motif was photoengraved on a screen made of 100 mesh plain weave polyester gauze. UV-curable paint with 0.2 part of Shinka Sheared pigment added to Formulation 1 [viscosity 250 poise (Lyon viscometer)]
was scraped off using a urethane rubber squeegee with a hardness of 55 degrees and screen printed. Next, UV irradiation was performed for 3 seconds under the same conditions as in Example 1 to form a first film with an average film thickness of 100μ.
A screen printed coating was formed.

Next, on the first screen-printed coating, a 300-mesh plain-woven gauze made of polyester was covered with a pattern in which gradations were created by changing the density of the halftone dots of several petals that matched the above-mentioned petal pattern. Using a photoengraved screen plate, the air-drying vinyl resin-based red paint ``Vinate'' (trade name, manufactured by Nagase Screen Institute) was screen-printed using a urethane rubber squeegee with a hardness of 82 degrees, dried at room temperature, and an average film A second screen printed coating with a thickness of 5 microns was formed.

The resulting painted board had a beige pear surface with a smooth, raised pink petal pattern with a soft gradation of red petals, giving it a highly decorative design.

Comparative Example 1 A coated plate was produced in the same manner as in Example 1, except that a 150-mesh plain-woven gauze was used as the screen plate for forming the first screen-printed coating.

On the obtained coated plate, the first screen-printed coating film was left uncoated in the minute depressions of the tile-like convex parts, and moth-eaten marks appeared, and furthermore, the second screen-printed coating was left on top of it.
A screen coating film could not be formed and the design was significantly degraded.

Comparative Example 2 A base color coating film and a first screen printing coating film were formed in the same manner as in Example 1.

Next, direct gravure printing was performed on the first screen-printed coating using a cylinder made with a plate having a maximum plate-making depth of 30 μm and a floral pattern similar to that of Example 1. In the obtained coated plate, the printing pressure changed due to the uneven thickness of the calcium silicate plate, which not only caused printing unevenness but also made it difficult to synchronize, resulting in pattern misalignment.
Furthermore, the printed surface did not have the sharpness of screen printing, the color density was low, and there was no three-dimensional appearance.

Comparative Example 3 A coated plate was produced in the same manner as in Example 2, except that a 100-mesh plain-woven gauze was used as the screen plate for forming the second screen-printed coating.

The resulting painted board was unable to express fine patterns due to the large mesh of the gauze, resulting in a pattern in which 100% of the petals were missing, resulting in a plain appearance with two colors of pink and red, and a poor design quality. It was hot because of the painted board.

[Brief explanation of the drawing]

FIG. 1 shows an example of the three-dimensional multi-pattern coated plate of the present invention. 1: Substrate, 2: First screen printing coating film, 3:
Second screen printed coating.

Claims (1)

[Claims] 1. After applying a base color coating as necessary on a substrate having a porous or finely uneven surface and a patterned uneven surface, the entire surface or a part of the convex portion of the patterned uneven surface is applied. Then, a colored ultraviolet curable paint containing transparent glass beads is screen printed using a screen plate having a mesh number of 100 meshes or less to form a first screen printed coating, and then the first screen printed coating is on the membrane,
A three-dimensional multi-pattern coated plate characterized in that a second screen-printed coating film is formed by partially screen-printing a paint of a different color from the ultraviolet curable paint using a screen plate having a mesh number of 150 or more meshes. manufacturing method.