JPH0150468B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention provides a material having a large shading difference between convex portions and concave portions, which is suitable for use in manufacturing internal and external wall boards of buildings, decorative boards, etc.
This article relates to a method for producing a multi-layered patterned surface that is both profound and aesthetically pleasing.

[Background of the invention]

BACKGROUND ART Conventionally, in order to improve the aesthetic appearance of the interior and exterior walls of buildings, it has been customary to apply a multi-layer pattern of unevenness, such as a stucco pattern, to the surfaces thereof. To form such a multi-layered patterned surface, a worker at a construction site or the like directly applies cement-based binding material,
Or, spraying materials in which aggregates, pigments, additives, inorganic powders, etc. are mixed with a binding material such as synthetic resin emulsion,
Methods include spray painting in scattered dots and drying, or pressing down the top of the spray material with a trowel or the like to make it flat once the spray material is semi-hardened. However, when manufacturing at a construction site, there are differences in shading due to the uneven multilayer pattern, but since workers do it manually, it is difficult to make it uniform, and it is especially difficult to flatten it, which makes it difficult to achieve aesthetically pleasing results. It was difficult to obtain things. Furthermore, if the shadow difference becomes too large, only the convex portions will stand out and the image will lack a sense of solidity.

On the other hand, methods for manufacturing multilayer pattern surfaces in a factory have been proposed in Japanese Patent Application Laid-open Nos. 53-16740 and 1984-84666, but in the case of factory manufacturing,
In order to speed up the production, it is carried out continuously using a conveyor, etc., but it takes time for the spray material and paint to dry, making it impossible to deepen the unevenness of the multilayer pattern, and furthermore, it is difficult to produce it continuously. Decorative boards with multi-layer pattern surfaces are stored in layers, so if the spray material is not sufficiently dried,
Since the thickness of the convex portion is reduced by the weight, the unevenness becomes even shallower. Therefore, when a decorative board or the like having a multilayer pattern surface is manufactured in a factory, there is no difference in unevenness, and it is not possible to obtain a decorative board with a large unevenness and a large difference in shading as in the case of on-site construction.

[Purpose of the invention]

The present invention aims to improve the above-mentioned conventional drawbacks and provide a method for producing a multilayer pattern surface that has a large shading difference, a three-dimensional effect, and is profound and aesthetically pleasing.
As a result of intensive research, we applied a primer paint on the base material,
On top of that, a specific amount of aggregate with a specific particle size is sprinkled to form an uneven area with many shadows, and on top of that, spraying material is sprayed in scattered dots, and the sprayed material is applied in scattered dots to the top of the aggregate. By pushing it out to the position to form a smooth and uniform flat part of the convex part, and applying a topcoat over it, the difference in brightness between the flat part of the convex part and the uneven surface of the concave part is emphasized, thereby creating shadows. The difference is large;
We succeeded in producing a multi-layered patterned surface that has a solid feel and an excellent appearance.

[Prior art]

Conventionally, powder or aggregate is scattered on the undercoat paint, and spraying material is applied over it in a scattered manner, as disclosed in JP-A-53-16740 and JP-A-56-84666.
However, since JP-A No. 53-16740 is a method for dispersing powder particles with the main purpose of improving the adhesion strength between the spraying material and the base material, the diameter of the powder particles is is small, and the number of scattered pieces is too large, and the unevenness is small and fine, so the shading of the concave part is small and the difference in shading of the entire pattern is small.
Publication No. 84666 spreads aggregate with the main purpose of flattening the top of the sprayed material, so if the particle size of the aggregate is too small or the amount of aggregate spread is too small, unevenness may occur. The pattern is small and has little or no shading, there is not much shading in the uneven parts, and the difference in shading across the entire pattern is small.
It had a less profound feel. In addition, both of the above publications also describe a method of mixing and spreading the undercoat and powder or aggregate, but with this method, the unevenness of the powder or aggregate is not affected by the undercoat. It is wrapped up and reduced, resulting in very small difference in shading, and it lacks a sense of solidity.

[Structure of the invention]

That is, the gist of the present invention is to apply an undercoat on a base material, sprinkle 25 to 200 pieces/ ^cm2 of aggregate with a particle size of 35 to 14 mesh on the undercoat, and form uneven parts. Spraying material is applied in scattered dots on top of the aggregate, and the sprayed material is pushed out to the upper end of the aggregate to form a flat convex part, and the flat part of the convex part and the unevenness of the remaining concave parts are formed. The present invention resides in a method for manufacturing a multilayer pattern surface, characterized in that a top coat is applied to the surface of the convex portion and the uneven surface of the concave portion to emphasize the difference in shading between the flat portion of the convex portion and the uneven surface of the concave portion.

Substrates used in the present invention include those with a smooth surface, such as plywood, particle board, hardboard, concrete board, asbestos slate board, gypsum board, wood cement board, steel board, galvanized steel board, aluminum board, etc. An example of this is construction board materials. It goes without saying that the surface of this base material may be subjected to appropriate treatment, such as painting.

The undercoat used in the present invention may be a water-based paint, a high solids type paint, a non-solvent type paint, or an organic solvent diluted type paint, and may be a water-based paint, a water-soluble acrylic melamine type paint, an acrylic emulsion type, or a vinyl acetate-acrylic copolymer type paint. Water-based paints such as emulsion, organic solvent-diluted paints such as acrylic, acrylic urethane, vinyl chloride resin, and epoxy, high-solids paints such as melamine, acrylic, and epoxy, and non-solvent epoxy paints. I can give an example.

The aggregate used in the present invention has a particle size of 35 to 14 mesh, preferably 35 to 20 mesh. i.e. on 35 mesh sieves, 14
It is under the mesh sieve. If the particle size of the aggregate is too small, the shading of the uneven parts will be small and the shading difference of the entire multilayer pattern will not be visible. As the number of particles decreases, the difference in shading in the multilayer pattern as a whole becomes small.Also, as the particle size increases, the amount of spray material applied increases, which slows down drying and reduces productivity.It is also uneconomical and labor intensive. The adhesion strength of the material also decreases. As for the type of aggregate, silica sand, cold water sand, quartz grains, glass beads, plastic beads, etc. are preferably used, but silica sand is particularly easy to obtain and is stable in terms of performance such as weather resistance, heat resistance, and solvent resistance. This is preferable. Note that the above particle size range falls under No. 4 silica sand and No. 3 silica sand, but if the grains are elongated, those with a longer diameter larger than the sieve mesh will pass through, so if these are roughly sieved and removed, It is more preferable because the particle size is uniform.

Examples of the spraying material used in the present invention include multilayer pattern spraying material E (using synthetic resin emulsion-based binder), C
Examples include RE (using a cement-based binder), RE (using a reaction-curable synthetic resin solution-based binder), and a mixed composition of two or more of the above E, C, and RE.

As with the undercoat, the top coat used in the present invention includes water-based paints such as known water-soluble acrylic melamine, acrylic emulsion, vinyl acetate-acrylic copolymer emulsion, acrylic, acrylic urethane, acrylic melamine, etc. Examples include organic solvent diluted paints and high solids paints such as melamine and acrylic paints. In view of its functionality, the top coat is preferably weather resistant.

Next, a method for manufacturing a multilayer pattern surface according to the present invention will be explained with reference to the drawings.

Apply an undercoat 2 on the base material 1, and apply the undercoat 2 on the base material 1.
25 to 200 pieces/cm ² of aggregate 3 are scattered on top to form an uneven part where many shadows occur, and spraying material 4 is applied on top in a dotted manner, and the sprayed material 4 in the shape of dots is applied as described above. The aggregate 3 is pushed to the upper end position to form a smooth and uniform convex flat portion 5, and a top coat 6 is applied to the convex flat portion 5 and the remaining concave portions of the concave portion to form a convex flat surface. 7 and the uneven surface 8 of the recessed portion is emphasized.

As a method for applying the undercoat paint 2, methods such as spray coating, flow coating, and roll coating can be used. The amount of primer paint applied depends on the dry film thickness.
30~100μ, in the case of water-based paints, the application amount is 600~
Approximately 2000 g/m ² is preferable. If the coating amount is too small, the retention of the aggregate 3 will be poor, and if it is too large, the aggregate 3 will be buried in the undercoat paint and the unevenness of the uneven portions will become small, which is not preferable.

As a method of dispersing the aggregate 3, a method of dispersing with an automatic dispersing device such as a drop method, a method of dispersing through a sieve, etc. can be used. The amount of aggregate 3 to be spread is 25 to 200.
pieces/cm ² , preferably 50 to 150 pieces/cm ² . If the number of aggregates 3 is too small, the number of shading by the aggregates 3 will be small, and the difference in shading of the entire multilayer pattern will be small. If the number of aggregates 3 is too large, the aggregates 3 will stick together. Only a small number of concave and convex portions are formed, and therefore the shadow becomes small, and the difference in shadow of the entire multilayer pattern becomes small. That is, when actually spreading the aggregate 3, it is sufficient to spread the aggregate at a rate of approximately 250 to 700 cm ³ /m ² , for example, in the case of silica sand, approximately 350 to 1000 g/m ² .

After the aggregate is spread, it is preferable to dry the undercoat 2 and fix the aggregate 3.

The spraying material 4 may be applied in a dotted manner using a spraying machine such as a spraying gun. The viscosity of the spray material 4 is preferably 100 to 600 poise. If the viscosity is too low, it will be difficult to form convex portions, and if the viscosity is too high, it will be difficult to spray and it will be difficult to obtain a multilayer pattern with clear edges. The amount of spray material 4 applied varies depending on the multilayer pattern to be obtained, but is usually 200 to 3000 g/ ^m2.
degree is preferred.

The method of pushing out the sprayed material 4 is to use a method that can uniformly push out the material by warping or twisting the base material 1, for example, by using a pressing roller with a large number of narrow roller elements arranged in parallel. It is preferable to use a pushing device or the like that pushes out the material through an endless synthetic resin sheet.

In the present invention, the above-mentioned spray material 4 is pushed out to the upper end of the aggregate 3 therein, that is, to the highest point of the aggregate 3, and the convex flat part 5 is pushed out. It forms. That is, if you apply pressure with the above-mentioned pushing device and push it out,
The aggregate 3 is naturally pushed down to the height of the upper end, and a smooth convex flat part 5 with a uniform height is easily formed.

It is preferable to dry the flattened spray material 4. The drying method may be carried out using a hot air dryer or the like while conveying the coated substrate using a conveyor or the like.

The top coat 6 may be applied by conventional methods such as spray coating, flow coating, and roll coating, but airless reciprocating spray coating is preferred in order to coat the uneven parts of the recesses with as uniform a thickness as possible. The coating amount of the top coat 6 is preferably 10 to 100 μm in dry film thickness, and in the case of a water-based coating, the coating amount is preferably about 200 to 2000 g/m ² . If the amount applied is too small, it will be difficult to uniformly paint uneven parts, and the retention of the aggregate 3 will be poor; if it is too large,
The concave parts of the uneven parts are filled with the top coat 6,
The uneven parts will have small shadows. When the top coat 6 is applied, the flat surface of the convex portion 5 is coated thickly because the surface is flat, and the uneven portion is coated thinly because the surface area is large, further emphasizing the difference in unevenness between the flat surface 7 and the concave and convex surface 8 of the convex portion. It becomes what is given. The flat surface 7 of the convex portion is smooth and bright with ridges,
Since the uneven surface 8 of the recessed portion has unevenness due to a large number of aggregates 3, it becomes dark with shadows, and the multilayer pattern as a whole has a large difference in shading.

In manufacturing, it is extremely difficult to maintain a constant shade difference between the flat surface 7 and the uneven surface 8 of the convex portion. That is, the difference in shading of the resulting multilayer pattern changes even with small changes in the type of paint, viscosity, amount of coating, drying conditions, type of aggregate, particle size, amount of spraying, etc. When managing this difference in shading with the naked eye,
It varies due to individual differences among observers and cannot be controlled in a fixed manner. Therefore, as a simple method for managing this shade difference, it is preferable to use a color difference meter to manage it numerically. The color difference between the convex flat surface 7 and the uneven surface 8 of the multilayer pattern surface obtained by the method of the present invention is L,
When measured with a color difference meter with a and b display, it is approximately 7 to 15. It goes without saying that the above-mentioned color difference value management can be performed even at the stage of dispersing the aggregate 3 on the undercoat paint 2, and more accurate management is possible if it is managed at each stage.

〔Effect of the invention〕

As described above, according to the present invention, the uneven surface is made to create an optimal shadow due to the aggregate, and the flat surface of the convex portion is formed by being pushed out to the upper end of the aggregate. It becomes smooth and uniform, and the shading of the above-mentioned uneven parts stands out, and the multi-layer pattern as a whole has a large difference in shading, has a three-dimensional effect, and has a solid and aesthetically pleasing multi-layer pattern surface.

Further, in the method of the present invention, since the spray material is pushed to the upper end of the sprayed aggregate, it is easy to form the convex and flat parts, and it is possible to manufacture uniform parts.

Furthermore, if the shading difference of the multilayer pattern is managed using color difference values, it is possible to easily produce a multilayer pattern surface of constant quality.

〔Example〕

The present invention will be explained below with reference to Examples.

Example After applying approximately 160 g/m ² (dry film thickness of 60 to 80 μm of acrylic emulsion undercoat paint) on an aluminum plate using a flow coater, immediately coated with silica sand No. 4 (35
Approximately 450 pieces of sand (~20 mesh) are collected using a falling sand spreader.
~550g/ ^m2 (approx. ^320-390cm3 / ^m2 , approx. 90-110 pieces/
cm ² ) and dried in a hot air dryer at 80 to 100°C for 6 minutes to fix the silica sand. Next, an acrylic emulsion spray material with a viscosity of 230 to 270 poise is sprayed using a spray gun in the form of approximately 1000 g/ ^m2 dots, and then a pressure roller with a large number of narrow roller elements arranged in parallel is used to apply the spray material. The top of the scattered spray material is pushed out to the upper end of the silica sand using a push-out device that pushes it out through an endless synthetic resin sheet, forming a convex flat part, and dried in a hot air dryer for 80 to 80 minutes.
It was dried at 100°C for 20 minutes. On top of that, apply an acrylic emulsion top coat using airless reciprocating spray to approximately 160g/m ² (approximately 80μ in dry film thickness on flat areas).
It was spray painted and dried in a hot air dryer at 80-100°C for 7 minutes.

The obtained multilayer pattern finished board has a height difference of about 2 mm between the flat surface of the convex part and the concave part of the uneven part, and the flat surface of the convex part is smooth and bright, and the concave part of the concave part has a large height difference due to the silica sand. The unevenness creates a dark shadow, and the difference in shading across the entire multilayer pattern appears large.The color difference between the flat surface of the convex part and the uneven surface of the concave part was measured with a color difference meter with L, a, b display, and the value was 11. It had a large color difference, had a solid feel, and had a perfect stucco-like multilayer pattern with uniform convex and flat surfaces and excellent aesthetic appearance.

Comparative Example 1 After applying approximately 120 g/m ² (dry film thickness of 50 to 60 μm of acrylic emulsion undercoat) on an aluminum plate using a flow coater, immediately coated with silica sand No. 5 (65
Approximately 120 pieces of sand (~35 tons) are mixed with a falling sand spreader.
~130g/ ^m2 (approx. ^85-93cm3 / ^m2 , approx. 200-210 pieces/
cm ² ) and dried in a hot air dryer at 80 to 100°C for 5 minutes to fix the silica sand. Next, an acrylic emulsion spray material with a viscosity of 230 to 270 poise was sprayed in a dot shape of approximately 800 g/ ^m2 using a spray gun, and then the spray material in the dot shape was applied using the same extrusion device as in the example. Push out the top of the silica sand to the top of the silica sand to form a convex flat part, and heat it in a hot air dryer at 80 to 100℃.
Let it dry for 20 minutes. Furthermore, an acrylic emulsion top coat was spray-coated on top of it using an airless reciprocating sprayer at a rate of about 100 g/m ² (dry film thickness on the flat area: about 50 μm), and dried in a hot air dryer at 80 to 100° C. for 7 minutes.

The obtained multilayer pattern finished board had a height difference of about 1 mm between the flat surface of the convex portion and the concave portion of the uneven surface, and the flat surface of the convex portion was smooth and bright, but the concave portion of the concave portion was uneven. It is small, has few shadings, is not very dark, and the difference in shading of the entire pattern is small.The color difference between the flat surface of the convex part and the uneven surface of the concave part was measured with a color difference meter, and it was numerically 3. It was small, thin, lacked a three-dimensional feel, and lacked a profound feeling.

Comparative Example 2 An acrylic emulsion paint was coated on an aluminum plate at about 60 g/m ² (dry film thickness: about 30 μm) using a flow coater and dried at 80 to 100°C. Next, apply acrylic emulsion primer paint/
Spray No. 3 silica sand (20 to 14 mesh) = 1:1.2 aggregate mixed primer paint with a spray gun at 500 to 600 g/m ² (approximately 8 aggregate
~10 pieces/ ^cm2 ) After painting, dry in a hot air dryer at 80~100℃.
Let dry for 15 minutes. Next, an acrylic emulsion spray material with a viscosity of 230 to 270 poise is applied using a spray gun in the form of scattered dots of approximately 1400 to 1700 g/ ^m2 , and then a push-out device is used to apply the spray material to the top of the dotted spray material. was pushed out to the top of the silica sand to form a convex flat part, and dried in a hot air dryer at 80 to 100°C for 25 minutes. Furthermore, an acrylic emulsion top coat was spray-painted using air spray at approximately 160 g/m ² (dry film thickness on the flat area was approximately 80 μm), and 80 g/m 2 was applied using a hot air dryer.
Dry at ~100°C for 7 minutes.

The obtained multilayer pattern finished board had a height difference of approximately 3 mm between the flat surface of the convex portion and the concave portion of the uneven surface, and the flat surface of the convex portion was smooth and bright, but the concave portion of the concave portion was uneven. The number is small and the shading is sparse, and there is not much difference in shading across the entire pattern.When the color difference between the flat surface of the convex part and the uneven surface of the concave part was measured with a color difference meter with L, a, b display, it was 5. The color difference was numerically small, and the product lacked a sense of solidity and beauty.

Comparative Example 3 A spray material made of an acrylic emulsion binder mixed with aggregate, pigments, additives, inorganic powder, etc. was spray-painted on the exterior wall of a building in scattered dots by on-site construction. When semi-cured, the top of the sprayed material was pressed flat with a trowel to form a stucco-like multilayer pattern.

This multilayer pattern surface had a large difference in shade, and the color difference between the flat surface of the convex portion and the concave portion was measured to be 11. However, the flat surfaces of the convex portions did not have a uniform height and were uneven, resulting in poor aesthetic appearance.

From the above examples, it is clear that the multilayer pattern surface produced by the method of the present invention has a large shade difference, has a three-dimensional effect, is profound, and has an excellent aesthetic appearance.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view illustrating a multilayer pattern finished board produced by the method of the present invention. DESCRIPTION OF SYMBOLS 1... Base material, 2... Undercoat paint, 3... Aggregate, 4... Spraying material, 5... Convex flat part, 6... Top coat, 7... Convex part flat surface, 8... Uneven part.

Claims (1)

[Scope of Claims] 1. An undercoat is applied onto the base material, and 25 to 200 pieces/ ^cm2 of aggregate with a particle size of 35 to 14 mesh are sprinkled on the undercoat to form uneven parts. The spraying material is applied in scattered dots to the aggregate, and the sprayed material is pushed out to the upper end of the aggregate to form a flat convex part, and the flat part of the convex part and the uneven part of the remaining concave part are formed. A method for producing a multilayer pattern surface, characterized in that a top coat is applied to the surface to emphasize the difference in shading between the flat surface of the convex portion and the uneven surface of the concave portion. 2. The method for producing a multilayer pattern surface according to claim 1, wherein the shade difference is managed by a color difference value.