JPH09314042A - Multicolor pattern coating method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method capable of easily forming spots from large size to small size and suitable for finishing a multicolor pattern of a precoated building material mass-produced at a factory especially in the method in which the multicolor pattern is finished by applying plural liq. coating materials different in color in spot-like respectively. SOLUTION: In the method in which the multicolor pattern is finished by applying plural liq. coating materials different in color in spot-like respectively by using plural air mixing coating guns, a coating is executed under the condition in which an inner diameter of a nozzle tip part of the air mixing coating gun is 1-4mmϕ, a coating pressure is 0.5-10kg/cm<2> , an air mixing air pressure is 0.1-4kg/cm<2> , an air effluent amount is 40-100l/min and a distance between a gun tip and a surface to be coated is 300-1,500mm.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of applying a plurality of liquid paints having different colors to each other in a spotted manner to form a multicolored pattern. Large or small spots can be easily formed, and particularly mass production in a factory. Suitable for multicolor pattern finishing of pre-coated building materials.

[0002]

[Problems to be Solved by the Related Art] In order to enhance the design of building material panels used for the interior and exterior walls of buildings, a plurality of liquid paints of different colors are applied in spots to form a multicolored pattern. Is done a lot.

Conventionally, as a method of finishing a multicolored pattern in spots, a liquid paint in which a paint of another color is mixed into a base color paint so as to form a granule has a large nozzle aperture,
Known methods include coating with an air spray gun such as a Zoracoat gun or an air spray gun (method 1), and a method in which base color paint and other color paints are applied separately at the same time with an air spray multi-head gun (method 2). Has been.

However, although the method 1 allows site construction on a building, in line coating, particles of other color paint dispersed in the base color paint are liable to collapse during agitation and circulation, There is a problem that it is difficult to obtain a stable spot pattern. In Method 2, since the coating method is an air spray method, there is a large amount of air for atomizing the coating material, and therefore the size of the spots is small and most of them are circular, so that there is a problem that the design is monotonous and scarcely changes. There are some points, and it is difficult to finish a multicolor pattern of three or more colors.

[0005]

SUMMARY OF THE INVENTION The present invention relates to a multicolor pattern finishing method which solves the above problems, and uses an air mix painting gun having a particular nozzle inner diameter, and a particular paint pressure, air mix air pressure, and air outflow rate. The present invention has been completed by finding that the object can be achieved by applying spot-shaped coating at a distance between the gun tip and the surface to be coated.

That is, the present invention is a method for applying a plurality of liquid paints of different colors to each other by using a plurality of air mix painting guns to finish a multicolor pattern, and the nozzles of the air mix painting guns. Inner diameter of the tip is 1 to 4 m
In mm in diameter, the paint pressure is 0.5 to 10 / cm ^2, Eamikusuea pressure 0.1~4kg / cm ^2, the distance between the air outflow 40 to 100 l / min, gun tip and the coating surface 30 The present invention relates to a multicolor pattern coating method which is characterized by coating spots under a condition of 150 cm.

The multicolor pattern coating method according to the present invention will be specifically described below.

The air mix coating gun used in the present invention is included in an airless coating machine.

That is, the airless coating machine resembles a water gun and sprays paint from a nozzle at high speed to collide with air to atomize the paint. Usually, the inner diameter (also called equivalent diameter) of the tip of the nozzle is 0. 3 ~ 0.5mmφ, paint pressure is 8
The coating is performed under the conditions of 0 to 150 kg / cm ² and the distance between the gun tip and the surface to be coated of 20 to 30 cm, and air is not used in principle. Since the air mix coating gun is designed to discharge air from around the nozzle of the airless coating machine, the coating pressure is 40 to
Even if the pressure is lowered by 80 kg / cm ^2, atomization and uniformity of the spray pattern can be maintained, nozzle clogging can be prevented, and nozzle wear resistance is excellent. The air discharge rate of the air mix coating gun is 40 to 100 liters / minute, and the air pressure is 0.1 to 4 kg / cm ² .

On the other hand, in the air mix coating gun used in the present invention, the inner diameter of the nozzle tip is made larger than the above (0.3
(From 0.5 mmφ to 1 to 4 mmφ), and the coating pressure is low (40 to 80 k) among the above-mentioned conditions during coating.
By changing from g / cm ² to 0.5 to 10 kg / cm ² ), the atomized particles have an arbitrary size (0.1 to 50 mm in diameter) from large particles to small particles.

An air spray type coating machine is also known, which imparts a large shearing force to the paint jetted from the paint nozzle by the subsonic air flow jetted at ² kg / cm ² or more at the tip of the gun to atomize the paint. Usually, the nozzle tip inner diameter is 0.8 to 1.5 mmφ, the paint pressure is 1 to 5 kg / cm ² , and the air outflow rate is 150 to 500.
The coating is performed in the range of liter / minute and the air pressure in the range of ^{2 to 4} kg / cm ² . Comparing this with the coating conditions of the air mix coating gun used in the present invention, in the present invention, the air outflow rate is 40 to 100 liters / minute, which is small, and the inner diameter of the nozzle is also large, 1 to 4 mmφ. When coating under the conditions of the above air spray type coating machine, the size of the spots is small and most of them are circular because the amount of air for atomizing the paint is large, and the object of the present invention is monotonous in design and poor in change. Can not be achieved.

Regarding the air mix coating gun used in the method of the present invention, as described above, the inner diameter of the nozzle tip portion is 1 to 4 mmφ, preferably 1.5 to 2.5 mm.
φ, paint pressure is 0.5 to 10k during painting
g / cm ² , preferably 1 to 3 kg / cm ² , and the air-mix air pressure is 0.1 to 4 kg / cm ² , preferably 0.
The air flow rate is 3 to ² kg / cm ² , and the air outflow rate is 40 to 100 liters / minute, preferably 40 to 60 liters / minute. Moreover, the distance between the tip of the gun and the surface to be coated is 30 to 150 cm, preferably 50 to 100 cm. If the inner diameter of the nozzle tip is smaller than 1 mmφ, large-sized spots cannot be obtained, and if it is larger than 4 mmφ, the spot pattern tends to sag, which is not preferable. In addition, the paint pressure is 0.5 kg / c
If it is smaller than m ² , the amount of paint discharged is small and it is difficult to form a spot pattern. If it is larger than 10 kg / cm ² , the spot pattern tends to sag, and the air-mix air pressure is 0.1 kg.
If it is less than / cm ^2, it is difficult to form a spot pattern and it is 4k.
If it is more than g / cm ² , large spots cannot be obtained. If the air outflow rate is less than 40 liters / minute, it becomes difficult to form a spot pattern, and if it exceeds 100 liters / minute, large spots cannot be obtained. Is also not preferable.

The multicolor pattern coating method according to the present invention can be accomplished by applying a plurality of colored liquid coating materials having different colors in spots using the air-mixing coating gun under the above conditions.

The colored liquid coating composition contains a vehicle component and a coloring pigment as main components, and these are mixed with an organic solvent and / or
It is obtained by mixing and dispersing in water.

The vehicle component consists of a base resin and a curing agent. As the base resin, an acrylic resin, an alkyd resin, a polyester resin, a urethane resin and a fluororesin having two or more cross-linkable functional groups selected from a hydroxyl group, an epoxy group, a carboxyl group and an isocyanate group in one molecule. As a curing agent, a melamine resin capable of reacting with these functional groups, (block)
A compound selected from a polyisocyanate compound, an epoxy group-containing compound and a carboxyl group-containing compound can be used. These combinations can be arbitrarily selected by the combination of the base resin and the functional group depending on the purpose. The ratio of the base resin and the curing agent is, for example, 50 to 90%, especially 65 to 85% for the base resin and 50 to 1 for the curing agent, based on the total weight of the two.
0%, especially 35 to 15% is preferable.

As the color pigment, either a solid color pigment or a metallic pigment or a mixture of both can be used. Examples of solid color pigments include titanium white, zinc white, lithopone, carbon black, cadmium red, black iron oxide, cadmium red, red iron oxide, yellow lead, cadmium yellow, chromium oxide, cobalt green, ultramarine blue, Prussian blue, cobalt. Blue, manganese violet, azo pigments, phthalocyanine pigments, quinacridone pigments, isoindoline pigments, perylene pigments, thioindigo pigments, etc.Metallic pigments include aluminum powder, bronze powder, zinc dust, mica, metal oxide coated mica , Micaceous iron oxide and the like. The blending amount of the color pigment can be arbitrarily selected according to the purpose, but 0.5 to 200 parts by weight, particularly 1 to 100 parts by weight is suitable per 100 parts by weight of the base resin and the curing agent.

The colored liquid coating material can be obtained by mixing and dispersing the above-mentioned vehicle component and coloring pigment in an organic solvent and / or water. If necessary, an extender pigment (for example, calcium carbonate, aluminum silicate, silicic acid). Magnesium, etc.), anti-settling agent, UV absorber,
An anti-sagging agent or the like can be added.

The method of the present invention is carried out by applying a colored paint of two or more kinds using these components in spots with an air-mixing gun adjusted to the above conditions. The viscosity of each colored liquid paint at the time of painting is 0.
It is preferably 5 to 300 poise / 20 ° C. (preferably 1 to 10 poise / 20 ° C.) and the solid content is 10 to 70% by weight, particularly 30 to 60% by weight. A combination of two or more kinds of color tones can be arbitrarily selected according to the purpose, and the combination may be such that the color tones are visually different. In the method of the present invention, the object to be coated to form the pattern coating film is not limited, but a plate-shaped pre-coated building material that is mass-produced in a factory and constructed at a construction site (for example, inner and outer walls, floor material, ceiling material, etc.) is suitable. The materials include metals, woods, plastics, and inorganic materials, and composite materials of these are also possible.

Although it is possible to form the patterned coating film by directly coating the above-mentioned liquid colored coating composition on these objects to be coated, it is preferable to apply an undercoating composition or an intermediate coating composition in advance prior to that. It is also possible to apply a base coloring paint having a color tone different from or the same as that of the liquid coloring paint, and then perform the pattern painting. Known paints can be used as these undercoat paint, intermediate paint and base coloring paint,
Room temperature dry or heat curable organic solvent-based or water-based paints can be applied.

In the method of the present invention, two or more air-mixing coating guns, preferably 2 to 5 are attached to, for example, an automatic coating machine or the like, and arbitrary liquid paints having different color tones are respectively pumped by a pump and a pumping tank. It is carried out by pressure-feeding to the above-mentioned object and continuously coating them in spots at the same time or with a time difference. Simultaneous coating is the spraying of each liquid pigmented coating at about the same time. Also,
Stagger coating is the application of each colored paint individually with a time interval and at different times.If the next colored paint is applied while the spotted film that has already been applied is wet, a three-dimensional effect and A pattern with a good sense of depth can be obtained, but it does not matter if the next colored paint is applied after drying. The method for drying the patterned coating film depends on the vehicle contained in the coating material, but it is left at room temperature, heated to 100 ° C. or lower and forcedly dried.
Examples of the pattern coating method of the liquid colored coating material, which includes heat curing at a temperature of 00 ° C. or higher, include the following steps, but are not limited thereto.

1.1C1B method: Pattern coating is performed directly or on an object to which an undercoat paint or an intermediate paint is applied.

2.2C1B method: A base color paint is applied to an object to be coated, a pattern is applied while the coating film is wet, and then both coating films are simultaneously cured.

3.2C2B method: A base coloring paint is applied to an object to be coated, and the pattern is applied after forced drying.

4.3C1B method: A base color paint is applied to an object to be coated, and while the paint film is wet, a pattern paint is applied using two or more liquid color paints, and two or more other colors are applied. After pattern painting with the liquid coloring paint of
The three layer coating is cured simultaneously.

Of these methods, the 2C1B method and the 3C1B method are preferable. The reason for this is that the mottled spot-shaped coating film previously applied partially penetrates the spot-shaped coating film of the next different color to obtain a coating film having an excellent depth feeling.

Further, it is preferable that the coating amount of the colored coating material by the air-mixing coating gun is in the range of 80 to 300 g / m ² in total for each color.

[0027]

【The invention's effect】

1. According to the method of the present invention, the particle size of the spotted pattern formed by the liquid coloring paint is large (longitudinal direction or diameter is about 1).
From 0 to 50 mm) to small particles (longitudinal direction or diameter of about 0.1 to 10 mm) can be easily formed.

2. Since it is used with an air mix painting gun, it is suitable for multicolor pattern finishing of pre-coated building materials that are mass-produced in factories.

3. Since the particles are atomized during coating, there is no problem that the speckled pattern is destroyed by stirring and circulation of the coating.

4. Since the air mix painting gun is used under specific conditions, it can be easily formed from large particles to small particles.
Moreover, since the shape is not limited to the circular shape, it is easy to finish a multicolor pattern of 5.3 colors or more, which is remarkably improved in designability.

Next, examples of the present invention will be described.

Example 1 Asbestos cement calcium silicate board (JIS A 5418)
1.0-CK) with an undercoat paint (Kansai Paint Co., Ltd., trade name “EP Sealer Transparent”) with a cured coating film to a thickness of 15 μm, and dried at room temperature, and then the entire coated surface The base coloring paint (Note 1) was evenly applied (Note 2) with an automatic air-mixing gun.

Then, while the coating film is wet, 3
Liquid colored paints of different colors A (green), B (brown) and C (black) (Note 3) are applied simultaneously in spots with an air-mixing gun (Note 4), heated to 80 ° C and forcedly dried. Both coatings were then cured simultaneously. The coating amounts of the liquid color coating materials A, B and C are almost equal, and the total amount thereof is 100 to 150 g / m ² .

Observing the obtained pattern coating film, the size of the particles of the spot pattern formed by the liquid coloring coating materials A, B and C was distributed within the range of 0.5 to 4 mm, and the shapes other than the circular shape were also observed. Many were seen, and the depth and design were excellent.

Note 1: Base coloring paint manufactured by Kansai Paint Co., Ltd. under the trade name "Ares Aqua Gloss" (acrylic resin type room temperature drying aqueous emulsion type paint). Cream. Viscosity is 1.0 poise / 20 ° C.

Note 2: Base colored paint coating conditions Using an automatic air-mixing coating gun (Alloy Koki, trade name "Mini Auto Gun", nozzle 500CC / min), paint pump pressure ratio 30: 1, spraying pressure 80Kg / cm. ² , air mix pressure 0.5Kg / cm ² , reciprocating speed 60m
/ Min, a conveyor speed of 5 m / min, and a coating amount of 100 g / m ² were applied.

Note 3: Liquid colored paints A, B and C, manufactured by Kansai Paint Co., Ltd. under the trade name of "Ares Aqua Gloss" (acrylic resin type room temperature drying aqueous emulsion type paint). In each case, the viscosity is 1.0 poise / 20 ° C. and the solid content is 45% by weight.

Note 4: Conditions for spot-like coating: An automatic air-mixing coating gun (manufactured by Alloy Koki, trade name "Mini Auto Gun") equipped with three nozzles was used. The inner diameter of the nozzle tip of the gun is 1.5mmφ, and there are 3 paint tanks of 2 liters.
1.5kg / cm ² , air mix pressure 0.5Kg / cm
^{2. The} coating was performed under the conditions that the air outflow rate was 50 liters / minute and the distance between the tip of the gun and the surface to be coated was 1000 mm.

The shape and size of the spots can be adjusted by changing the paint supply pressure and the air mix pressure.

Example 2 Asbestos cement calcium silicate board (JIS A 5418)
1.0-CK) with an undercoating paint (Kansai Paint Co., Ltd., trade name “Alesteria Sheila S”) with a cured coating film to a thickness of 15 μm and drying at room temperature. The base colored paint (Note 5) was uniformly applied (Note 6) on the entire surface by an automatic air-mixing gun.

Then, while the coating film is wet, 4
Of the different colored liquid coatings A (green), B (brown), C (black) and D (black) (Note 7), first, A and B are applied simultaneously in spots with an air-mixing gun (Note 8) and leave at room temperature for 5 minutes,
The remaining C and D were simultaneously coated in spots with an air coating gun (Note 8), left at room temperature for 3 minutes, then heated to 80 ° C. and forcedly dried to simultaneously cure the three-layer coating film. The coating amounts of the liquid color coating materials A, B, C and D are almost equal,
The total amount is 250 to 280 g / m ² .

Observing the obtained pattern coating film, the size of the particles of the spotted pattern formed by the liquid color coating materials A, B and C was distributed within the range of 0.5 to 4 mm, and the shapes other than the circular shape were also observed. Many were seen, and the depth and design were excellent.

Note 5: Base coloring paint manufactured by Kansai Paint Co., Ltd. under the trade name "Alesteria" (inorganic / organic hybrid type room temperature drying aqueous emulsion type paint). Green color. Viscosity is 10 poise / 20 ° C.

Note 6: Base coloring paint coating conditions Using an automatic air-mixing coating gun (manufactured by Alloy Koki Co., Ltd., trade name "Mini Auto Gun", nozzle 500 CC / min), paint pump pressure ratio 30: 1, spraying pressure 80 Kg / cm. ² , air mix pressure 0.5Kg / cm ² , reciprocating speed 60m
/ Min, a conveyor speed of 5 m / min, and a coating amount of 150 g / m ² were applied.

Note 7: Liquid colored paints A, B, C and D manufactured by Kansai Paint Co., Ltd. under the trade name "Aresteria" (inorganic / organic hybrid type room temperature drying aqueous emulsion type paint). In both cases, the viscosity is 8 to 10 poise / 20 ° C., and the solid content is 55% by weight.

Note 8: Conditions for spot-like coating An automatic air-mixing coating gun (made by Alloy Koki, trade name "Mini Auto Gun") equipped with four nozzles was used. The inner diameter of the nozzle tip of the gun is 1.5 mmφ, and there are four 2 liter paint tanks, and the paint supply pressure to the gun is 1 to 1
1.5kg / cm ² , air mix pressure 0.5Kg / cm
² , air outflow rate is 50 liters / minute, reciprocating speed is 40
Coating was performed under the conditions of m / min, conveyor speed of 2 m / min, and the distance between the tip of the gun and the surface to be coated being 1000 mm.

The shape and size of the spots can be adjusted by changing the paint supply pressure and the air mix pressure.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hirofumi Hatanaka 3-12-1, Minamirokugo, Ota-ku, Tokyo Kansai Paint Co., Ltd. (72) Inventor Kazuo Yamashita 3-12-1, Minamirokugo, Ota-ku, Tokyo Kansai Paint Co., Ltd.

Claims (1)

[Claims] 1. A method of applying a plurality of liquid paints of different colors to each other by using a plurality of air-mixing coating guns to finish a multicolor pattern, wherein the inner diameter of the nozzle tip portion of the air-mixing coating gun is The coating pressure is 0. 1 to 4 mmφ.
5-10 kg / cm ² , air mix air pressure is 0.1
4 kg / cm ² , air outflow rate is 40-100 liters /
The distance between the tip of the gun and the surface to be coated is 300-1500 mm
A multicolor pattern coating method characterized in that it is applied in spots under certain conditions.