JPS63236570A - Manufacturing of 3-dimensional multicolor coated board - Google Patents

Abstract

PURPOSE:To form non-irregular and even 3-dimensional multicolor patterns by using screen plates with respectively specific mesh counts on a base having embossing pattern, starting with the screen plate with the largest mesh count and applying paints for silk screen printing. CONSTITUTION:A base 1 used are such as porous plates of concrete, hardboard, inorganic plates with the embossment and wooden plates. These plates have embossing patterns on the surface. A primary coat is applied where pattern elements are not provided on the first screen printing plate if necessary, then paints are applied by screen plates with a mesh count of 100 or less on the projected part of the base 1 using silk screen printing technique, thus forming the first screen-printed coating 2. After drying the coating 2, paints are applied with the screen plates with a mesh count of 150 or more on the first silk screen- printed coating 2 using the same technique to form the second silk screen-printed coating 3.

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. 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 direct gravure, offset, or offset gravure printing on the substrate (a). Alternatively, a method (b) is known in which a raised print is applied to the substrate by screen printing, and then the printed surface is printed using a stamp means such as gravure, offset, or offset gravure.

<Problems to be Solved by the Invention> However, method (A) is suitable for substrates with smooth substrate surfaces and no paint absorption, but when the substrate surface is porous or has minute irregularities, On substrates that contain paint, there may be uneven suction or uneven paint concentration, making it impossible to print uniformly.In this case, complicated surface treatments such as sealing, polishing, and base coat application are performed on the substrate surface in advance to make it smooth and coatable. There was a problem in that it had to be in a state where there was no suction of water.

Furthermore, 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 paint film in such a state by gravure, offset, offset gravure, etc., the difference in printing pressure will cause uneven paint transfer,
This method also has the problem that the surface of the substrate must be smooth and free from suction of paint.

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-pattern coated plate without uneven paint transfer or uneven paint density even without treatment or without accurate base treatment even if treatment is carried out. .

Means for Solving the Problems〉 That is, the present invention provides the following steps: After applying a base color coating as necessary on a substrate having a patterned uneven surface, a coating film of 10
A first screen printed coating film is formed by screen printing the paint using a screen plate having a mesh number of 0 meshes or less, and then the paint is screen printed onto the coating film using a screen plate having a mesh number of 150 meshes or more. The present invention relates to a method for producing a three-dimensional multicolored pattern coated plate, which comprises printing to form a second screen-printed coating film.

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 having fine irregularities. A typical example is a plastic board, 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.

Furthermore, for porous substrates and substrates with fine irregularities, the porous portions and fine concave portions may be sealed, polished, or coated with a base coat as necessary, but they may not be completely smoothed as in the conventional method. Or, it is not necessary to completely prevent paint from being absorbed.

In addition, if you want to apply desired coloring to the four parts or convex parts 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 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 an appropriate number of meshes, which hides areas other than the necessary pattern with resin, etc. This is a method in which a raised pattern coating film is formed by rubbing the 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 sand, a uniform coating level can be maintained by scraping with a squeegee. Note that the above effect will not be achieved no matter what kind of gauze is used, but 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.

In the present invention, 10
A first screen-printed coating film is formed by screen-printing the paint using a screen plate having a mesh J of 0 mesh or less, that is, a screen plate with large openings. 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. There is no particular limit to the lower limit of the number of meshes, but if the number is too small, it will not be possible to express a delicately patterned coating film, so a number of up to about 30 meshes is appropriate.

If the number of meshes exceeds 100 meshes, one squeegeeing operation will cause printing defects or skipping, and the surface of the coating film will not be smooth, which is not preferable.

The paint used can be a paint with a viscosity of about 100 to 400 poise, which has been conventionally used for screen printing. In other words, 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, but paints with low solid content dilute when dried. Water-based paints are not suitable because the agent evaporates and the surface of the paint film tends to become uneven, and water-based paints have poor leveling. In particular, in the present invention, active energy ray-curable paints are preferred, as they allow quick handling to the next process after screen printing and have a high solids content, and UV-curable paints are particularly preferred, as they are relatively easy to apply in terms of equipment. It is.

An ultraviolet curable paint has an ultraviolet polymerizable compound, a photopolymerization initiator, and a colored pigment as essential components, and further contains extender pigments, solvents, additives, etc. as necessary.

To explain in more detail, the above-mentioned "ultraviolet polymerizable compound"
As the compound, a compound having an unsaturated double bond capable of radical polymerization in the molecule is used. Specifically, relatively low molecular weight polyester resins, 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, N-vinylpyrrolidone, triethylene glycol di(meth)acrylate, trimethylolpropane tri( Representative examples include reactive monomers such as meth)acrylate and dipentaerythritol hexa(meth)acrylate, either alone 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 a "photopolymerization initiator", carbonyl compounds such as benzoin, benzophenone or their esters, benzoyl peroxide, azobisisobutyronitrile, diphenyl disulfide,
N-methyljetanolamine, 2,5-jetoxy-
Representative examples include 4-(p-tolylthio)benzenediazonium hexafluorophosphite. Coloring pigments include titanium oxide, carbon black, zinc white, iron oxide, Bengara, ultramarine, and phthalocyanine blue. Extending pigments include silica sand, silicates, talc, kaolin, barium sulfate, calcium carbonate, powder, and fiber. Representative examples include resin powders such as glass, polyurethane, polyester, polyethylene, and polystyrene. Furthermore, typical examples of the "solvent" include doluol, quidylol, acetone, methyl ethyl ketone, ethyl acetate, and the like.

In particular, in the present invention, it is preferable that the paint contains 20 to 70% by weight (based on the solid content of the paint) of transparent glass beads having a particle size of 30 to 60 μm. 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 cured sufficiently even when the film is thick, and the abrasion resistance of the coating film is further improved. is obtained.

After drying the first screen printed coating, a
The paint is screen-printed using a screen plate having a mesh number of 50 or more to form a second screen-printed film.

By using sand with a mesh number within the above range, even if the surface of the first screen printing coating has a somewhat uneven surface, a uniform, smooth, 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 it is too large, that is, if the meshes are too small, the paint will not be able to be rubbed in sufficiently, so a value up to about 350 meshes is appropriate. It should be noted that if it is less than 150 mm, it becomes difficult to form fine patterns, which is not preferable.

Note that if you print on the first screen printing coating by means such as gravure, offset, or offset gravure, there will always be uneven thickness on the substrate, and differences in the amount of ink transferred due to differences in printing pressure will cause color unevenness. The use of this method results in high cost, and is therefore not suitable for the present invention.

The paint for forming the second screen-printed coating may be the same as the paint for forming the first screen-printed coating, but in a different color.

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.
This is a screen-marked ti11 coating.

The three-dimensional multicolored pattern coated plate of the present invention is manufactured as described above,
Furthermore, if necessary, it is possible to overpaint (color) clear over the entire surface or part of the surface.

<Effects of the Invention> With the method of the present invention, even if the substrate surface is porous and absorbs paint, or has minute irregularities, it can be coated without any surface treatment. It is possible to produce a three-dimensional multi-pattern coated plate with a sharp and excellent design, which is completely smooth even after surface treatment as in the conventional method, and has no printing defects without preventing paint from being sucked in.

Furthermore, compared to methods such as gravure, offset, and offset gravure, it is less expensive 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 was applied to the surface of a calcium silicate plate whose surface had a tile-like uneven surface with grooves of 2 mm depth and 2 mm width at 100 mm angle, the entire surface was porous, and the bulk specific gravity was 0.8. Solvent-based enamel paint (PWC55%, Ipoly-
Color) was spray-painted at 80 g/m' and a base color coating was applied. Note that the base color coating film had fine irregularities all over.

Next, on the tile-like convex portion, a screen plate with a 100 mm square tile pattern photoengraved on a screen covered with 60 mesh hand-woven sand made of polyester was used to apply an ultraviolet curable paint consisting of the following paint formulation 1 [viscosity: 250 Boise (Lyon Viscometer)] was scraped off with a 55 degree hardness urethane rubber squeegee and screen printed.

Next, ultraviolet rays were irradiated for 2 seconds from a distance of 100 mm using a 120 W/ca+ metal halide lamp (containing Fe-3n) to form a first screen-printed coating film with an average thickness of 200 μm. Then on the first screen printed coating,
A urethane acrylate ultraviolet curable blue paint "A-1 Cure" was prepared using a screen plate with a photoengraved floral pattern that matched the 100 mm square tile pattern on a screen covered with 200 mesh plain weave polyester gauze. '' (trade name, manufactured by Nagase Screen Institute) with a urethane rubber squeegee having a hardness of 82 degrees, and a screen stamp was applied. Next, ultraviolet rays were irradiated for 4 seconds under the above conditions to avoid forming a second screen-printed coating film with an average thickness of 10 μm.

Next, an acrylic urethane resin-based solvent-type clear paint was spray-coated at 80 g/m' over the entire surface to produce a three-dimensional multi-pattern coated plate.

The obtained painted board has eye poly-colored recessed joints and white background l.
Consists of a smooth convex surface with a 00 mm square tile pattern,
Furthermore, a clear and fine floral pattern was printed in blue on top of the tile pattern, giving it a highly decorative coating with a finish similar to that of tiles.

Paint formulation 1 Acrylic urethane oligomer 22 parts N-vinylpyrrolidone 6 parts Acetophenone photopolymerization initiator 2. Kei transparent soda glass beads
62 parts (average particle size 30 μ) Zinc sulfide pigment 8 parts Example 2 A PVC steel plate with a beige satin-like surface was embossed, and a 100-mesh hand-woven gauze made of polyester was applied to the surface of the circular convex part with a difference of 15 mm. Using a photoengraved screen plate with an abstract flower petal motif pattern on a stretched screen, an ultraviolet curable paint (viscosity 250 poise (Lyon viscometer) was prepared by adding 0.2 parts of Shinkasha Red pigment to the above paint formulation l). )] was scraped off with a 55 degree hardness urethane rubber squeegee and screen printed. Next, ultraviolet rays were irradiated for 3 seconds under the same conditions as in Example 1 to form a first screen-printed coating film with an average thickness of 4100 μm.

Next, on the first screen-printed coating film, a pattern was created by applying gradation by changing the density of the halftone dots by placing several petals that matched the above-mentioned hole pattern on a screen covered with 300-mesh plain weave sand made of polyester. Using a photolithographic screen plate, screen print the air-dry vinyl resin red paint "Vinate" (trade name, manufactured by Nagase Screen Institute) with a urethane rubber squeegee with a hardness of 82 degrees, dry at room temperature,
A second screen printed coating was formed with an average thickness of 5 microns.

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

Comparative Example 1 A coated plate was produced in the same manner as in Example 1 except that 150 mesh plain weave sand was used as the screen plate for forming the first screen printed coating.

The obtained coated plate has the first
Uncoated areas of the screen-printed coating occurred, moth-eaten marks appeared, and furthermore, the second screen coating could not be formed on top of these, resulting in a marked deterioration in design.

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.

Then, on the first screen printed coating, a plate making depth of up to 3
Direct gravure printing was carried out using a cylinder with a printing plate of 0μ 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 slope, and not only uneven printing occurred, but also the same thickness and pattern deviation occurred.

Furthermore, the printed surface was not as sharp as 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 weave gauze was used as the screen plate for forming the second screen-printed coating.

The resulting painted board was unable to express a fine pattern due to the large grains of the sand, so the pattern had 100% of the petals missing.
It was a painted board with a plain appearance and poor design, printed in two colors of pink and red.

[Brief explanation of drawings]

FIG. 1 shows an example of the three-dimensional multi-pattern coated plate of the present invention. 1: Substrate, 2: First screen printed coating film, 3: Second screen printed coating film. 1st "4"

Claims (3)

[Claims] (1) After applying a base color coating as necessary on a substrate having a patterned uneven surface, paint is applied to the entire surface or part of the convex portion using a screen plate having a mesh number of 100 mesh or less. Screen printing to form a first screen printed coating film, and then screen printing a paint onto the coating film using a screen plate having a mesh number of 150 mesh or more to form a second screen printed coating film. A method for producing a three-dimensional multi-patterned painted plate characterized by: (2) The method for manufacturing a three-dimensional multi-pattern coated plate according to claim (1), wherein the entire surface of the substrate including the surface of the uneven portion is porous or has fine unevenness. . (3) The method for manufacturing a three-dimensional multicolored pattern coated plate according to claim (1), wherein the paint forming the first screen-printed coating is an ultraviolet curable paint.