JP7348707B2 - Roof decoration painting method - Google Patents

Description

The present invention relates to a method for decoratively painting a roof surface using a coating composition.

A roof is usually located at the top of a building, etc., and plays the role of maintaining a predetermined environment in a living space under the roof from rainwater and direct sunlight. For this reason, roofs are directly affected by the harsh natural environment and are therefore exposed to the worst conditions compared to other internal and external walls of buildings, and are prone to deterioration over time, resulting in poor appearance.
For these reasons, the purpose of painting roof surfaces is to improve functions such as heat insulation and durability, and at present little consideration has been given to the exterior appearance.

By the way, in Japanese houses, colors with low saturation and brightness such as black, gray, and brown are preferred as roof colors.

For example, Patent Document 1 proposes a black paint composition including a black pigment composition containing a phthalocyanine blue pigment, a phthalocyanine green pigment, and other chromatic pigments. The coating composition described in Patent Document 1 is capable of forming a coating film having heat-shielding properties while having a blackish appearance, which is popular as a roof color.
Further, Patent Document 2 and Patent Document 3 disclose a roof painting method that gives a matte appearance to the roof surface by painting a colored paint on the roof and then applying a matte clear paint. .

As described above, the roof surface coatings described in Patent Documents 1 to 3 have a simple, calm atmosphere such as a monotonous black color or a matte finish, and cannot be said to be unique.

In recent years, with the diversification of user tastes, there has been a demand for roofs to have an original appearance. For this reason, there is a need to develop a method for decorating roofs with a unique appearance while creating a dignified atmosphere.

Patent No. 6496293 JP2013-208513A JP2016-203146A

An object of the present invention is to provide a decorative coating method for a roof that uses a paint composition to create a unique appearance with a profound feeling.

The inventors of the present invention have conducted intensive studies on coating compositions and coating equipment for coating roof surfaces. As a result, it was discovered that by applying a coating composition containing colored paint particles obtained by granulating a colored paint and a binder resin under specific coating conditions, a roof appearance that leaves an impression on viewers can be obtained.

That is, the present invention is defined in Item 1.
A method for decoratively painting a roof using a paint composition, the method comprising:
The paint composition is a paint (X) containing colored paint particles containing colored paint particles obtained by granulating a colored paint, a binder resin, and water, and the nonvolatile content of the colored paint particles is less than the nonvolatile content of the paint (X). is within the range of 5 to 65% by mass,
The paint (X) is applied at a discharge pressure of 0.0 using an airless spray coating device equipped with an air jet mechanism near the nozzle. Paint within the range of 10 to 1.0 MPa,
Roof decoration painting method,
Section 2
The decorative painting method according to item 1, wherein the roof material is a material treated with stone grains.
Section 3
Item 2. The decorative coating method according to item 1 or 2, wherein the average particle diameter of the colored paint particles is within the range of 0.1 to 10 mm.
Section 4
The decorative coating method according to any one of items 1 to 3, wherein the paint (X) containing colored paint particles has a viscosity in the range of 50 to 150 KU;
Item 5
The decorative coating method according to any one of Items 1 to 4, wherein an undercoat colored paint composition is applied before applying the colored paint particle-containing paint (X);
Regarding.

According to the decorative coating method of the present invention, the paint containing colored paint particles is appropriately atomized, so that the pattern formed by the particles is appropriately scattered but fused, and a roof with a unique appearance that has a profound feeling can be obtained. Furthermore, the method of the present invention has the advantage of good painting workability and less paint scattering to the surrounding area.

<Object to be coated>
The object to be coated to which the decorative coating method of the present invention is applied is a roof. The roof may be a new roof installed on an outdoor building, an existing outdoor roof that has been installed for some time, or a roof base material that has not been shaped before installation. The materials for these roofs are not particularly limited, and examples thereof include metal materials, slate materials, cement materials, clay materials, and the like.

Examples of the metal material include steel, stainless steel, aluminum, zinc, copper, titanium, and alloys of combinations thereof. Examples of the slate material include decorative slate and natural slate. Examples of the cement material include pressed cement tiles and Moniel tiles. Examples of the clay material include Japanese roof tiles. In the present invention, roofing materials include materials coated with paint or resin, materials to which stone grains such as natural stone are attached, and materials treated in combinations thereof.

In the present invention, from the viewpoint of the texture of the roof, it is suitable that the material of the roof is a material to which stone particles are attached. The materials to which the stone particles are attached include materials called "steel plate roofs finished with natural stone particles," "roofs with natural stone particles," "stone chip steel plates," "asphalt shingles," and the like. By using these materials, the appearance and graininess of the materials are combined with the pattern created by the colored paint particles, which will be described later, and the texture of the roof is further improved.

The object to be coated may be previously treated with a sealer, a primer, etc. in order to improve the adhesion between the coating film and the surface of the object to be coated.

<Coating composition>
The paint containing colored paint particles (X) used in the present invention is a composition containing colored paint particles, a binder resin, and water. The coating material (X) used in the method of the present invention will be explained below.

The colored paint particles in the present invention are particles obtained by granulating a colored paint.
Examples of the colored paint include conventionally known liquid colored paints containing a colorant, an aqueous resin, water, and, if necessary, additives.

Examples of the colorant include color pigments and glitter pigments. Among these, colored pigments include, for example, white pigments such as titanium dioxide; black pigments such as carbon black, acetylene black, lamp black, bone black, graphite, iron black, and aniline black; yellow iron oxide, titanium yellow, and monoazo yellow. , condensed azo yellow, azomethine yellow, bismuth vanadate, benzimidazolone, isoindolinone, isoindoline, quinophthalone, benzidine yellow, permanent yellow, and other yellow pigments; permanent orange and other orange pigments; red iron oxide, naphthol AS-based azo red , anthurone, anthraquinonyl red, perylene maroon, quinacridone red pigments, diketopyrrolopyrrole, watching red, permanent red, and other red pigments; cobalt purple, quinacridone violet, dioxazine violet, and other purple pigments; cobalt blue, phthalocyanine Examples include blue pigments such as blue and blue, and green pigments such as phthalocyanine green. Examples of bright pigments include metallic pigments such as aluminum powder, bronze powder, copper powder, tin powder, iron phosphide, and zinc powder. ; Examples include pearlescent pigments such as mica, metal oxide-coated mica powder, and mica-like iron oxide. These can be used alone or in combination of two or more.

The type and amount of the colorant to be used is adjusted as appropriate, and is generally within the range of 0.01 to 500% by mass, preferably within the range of 0.05 to 400% by mass, based on the nonvolatile content of the aqueous resin. can be found in

In this specification, the term "non-volatile matter" refers to a residue from which volatile components such as water and organic solvents have been removed, and is a component that will form a coating film. Examples of drying conditions for the sample when measuring the nonvolatile mass include heating 1 gram of the sample in a dryer at 110° C. for 1 hour.

Moreover, in the above-mentioned colored paint, an extender pigment can also be used together with the colorant. Extender pigments include barita powder, precipitated barium sulfate, barium carbonate, calcium carbonate, gypsum, clay, white carbon, diatomaceous earth, talc, magnesium carbonate, alumina white, gloss white, silica sand, quartz powder, etc. Alternatively, two or more types can be used in combination.

As the aqueous resin as a raw material for producing the colored paint particles, a resin that can be dissolved or dispersed in water is used. There is no particular limitation on the type of resin, and specific examples include acrylic resins, polyolefin resins, silicone resins, polyurethane resins, epoxy resins, phenolic resins, polyester resins, alkyd resins, and polycarbonate resins. Examples include resins and the like. These resins can be used alone or in combination of two or more, and two or more of these resins may be modified or graft-polymerized. Further, when the aqueous resin is in the form of dispersed particles, it may be in the form of a single layer or a multilayer such as a core-shell type.

The additives include specific gravity adjusting materials such as balloon particles, antifoaming agents, curing agents, curing catalysts, pigment dispersants, fragrances, deodorizing agents, antibacterial agents, neutralizing agents, surfactants, aqueous water repellents, Examples include dispersants, preservatives, antifungal agents, antifreeze agents, ultraviolet absorbers, light stabilizers, film forming aids, plasticizers, zinc whiskers, formaldehyde adsorbents, flame retardants, and the like.

The size of the colored paint particles is generally in the range of 0.1 to 10 mm, preferably 0.2 to 5 mm.

By having the colored paint particles have the above-mentioned size, it is possible to create a roof appearance that has both an impact and a profound feeling.

In this specification, the size of colored paint particles is determined by randomly selecting 30 colored paint particles contained in paint (X), observing them with an optical microscope, and calculating the average value.

The method for producing the colored paint particles is not particularly limited, but includes, for example, a method in which a composition containing the colored paint and a water-soluble polysaccharide is brought into contact with an aqueous medium containing a metal compound and stirred.

The water-soluble polysaccharide is a polysaccharide that has the ability to change into a water-insoluble or poorly soluble gel when it comes into contact with a monovalent or polyvalent metal ion in an aqueous medium, and specifically, for example, Examples include alginic acid or an alkali metal salt thereof, gellan gum, carrageenan, etc., and each of these can be used alone or in combination of two or more.

The above metal compound is a compound that can generate monovalent or polyvalent metal ions that can form a water-insoluble or poorly soluble salt with a water-soluble polysaccharide in an aqueous medium, and the metal species in the metal compound include: Group 2 elements of the periodic table such as magnesium, calcium, strontium, barium; Group 6 elements of the periodic table such as chromium and molybdenum; Group 7 elements of the periodic table such as manganese; Group 8 elements of the periodic table such as iron and ruthenium; cobalt, rhodium, etc. Group 9 elements of the periodic table; elements of group 10 of the periodic table such as nickel and palladium; elements of group 11 of the periodic table such as copper and silver; elements of group 12 of the periodic table such as zinc and cadmium; elements of group 13 of the periodic table such as aluminum; cerium Among them, elements of Group 2 of the periodic table, particularly calcium, are preferable.

The above metal compound is not particularly limited as long as it is a compound having the above metal species, such as formic acid, acetic acid, propionic acid, butyric acid, lactic acid, oxalic acid, fumaric acid, succinic acid, phosphoric acid, citric acid, gluconic acid, etc. metal salts of organic acids; hydroxides, metal oxides; metal carbonates, etc., and these can be used alone or in combination of two or more.

An aqueous medium containing metal ions can be prepared by dissolving at least a portion of the above metal compound in an aqueous medium such as water. At this time, the metal compound does not need to be completely dissolved in the aqueous medium, and may be partially dissolved.

The stirring speed when bringing the composition containing the colored paint and the water-soluble polysaccharide into contact with the aqueous medium containing the metal compound is suitably within the range of, for example, 500 to 4000 rpm, preferably 700 to 3000 rpm.

The paint (X) used in the decorative painting method of the present invention has a pattern of colored paint particles dispersed in an appropriate amount, and from the viewpoint of protecting the roof, which is the object to be painted, the paint (X) is a paint film-forming component in addition to the colored paint particles. Contains a binder resin. The binder resin is preferably an aqueous resin from the viewpoints of affinity with colored paint particles and storage stability as a paint composition.

As the aqueous resin as the binder resin, those commonly used in the field of water-based paints can be used. For example, the aqueous resins described above for producing colored paint particles may be appropriately selected and used. Can be done.

In the present invention, from the viewpoint of painting workability, roof texture, etc., the nonvolatile content of the colored paint particles is within the range of 5 to 65% by mass in the nonvolatile matter of paint (X), and 10 to 45% by mass. It is preferably within the range.

Further, from the viewpoint of durability of the roof surface after painting, it is desirable that the colored paint particles and the binder resin each contain functional groups that can react with each other.
The combination of reactive functional groups contained in the colored paint particles and the binder component is not particularly limited as long as they can react with each other under drying conditions of the coating film, and specifically, for example, Hydroxyl group and isocyanate group, hydroxyl group and alkyl ether group, hydroxyl group and imino group, carboxyl group and epoxy group, amino group and epoxy group, amide group and epoxy group, carbonyl group and hydrazine group, carbonyl group and hydrazide group, carbonyl group and semicarbazide Examples include combinations of carbonyl groups and bisacetyl dihydrazone groups, self-condensation of hydrolyzable silyl groups, and oxidative curing with unsaturated fatty acid groups.

The paint (X) may contain extender pigments, glitter pigments, transparent paint particles, and paint additives, if necessary.

The paint additives include neutralizing agents, viscosity modifiers, antisettling agents, antistatic agents, softeners, antibacterial agents, fragrances, curing catalysts, pH adjusters, humidifiers, dispersants, antifoaming agents, Examples include flame retardants such as preservatives, antifungal agents, antifreeze agents, ultraviolet absorbers, light stabilizers, film forming aids, plasticizers, aldehyde adsorbents, and waxes.

The coating material (X) obtained as described above preferably has a nonvolatile content concentration of 15 to 45% by mass, particularly 20 to 40% by mass, from the viewpoint of roof texture and painting workability.

<Device>
The viscosity of the paint (X) is adjusted as necessary and applied to the roof using an airless spray coating device. An airless spray coating device is composed of a pressure pump for force-feeding a coating composition, a pressure-resistant hose, and a coating gun equipped with a nozzle, and the nozzle portion of the coating gun is equipped with a nozzle tip. The nozzle tip is usually replaceable depending on the amount and pattern of paint sprayed. Airless spray painting is a process in which the paint composition itself is pressurized by a pump, connected to a paint gun with a pressure hose, and the paint composition is sprayed from a nozzle using hydraulic pressure to atomize it into atomized particles, thereby applying the paint to the object being coated. This is a painting method that allows you to wear it.

Further, in the decorative coating method of the present invention, the discharge pressure during painting in this airless spray coating is within the range of 0.01 to 1.0 MPa, preferably 0.1 to 0.5 MPa, preferably 0.1 to 0.5 MPa. It is preferable that the pressure is within the range of 3 MPa. Here, "discharge pressure" is the pressure at which the paint composition is jetted out at the discharge part (nozzle part) where the paint composition is jetted out in the form of mist in airless spray painting, and is usually installed in an airless spray painting device. This is the value indicated by the pressure gauge. Since the discharge pressure during airless spray painting is within the range of 0.01 to 1.0 MPa, the amount of scattering to the surroundings is small, but the atomization of paint (X) progresses moderately, and the pattern due to colored paint particles is By scattering them appropriately on the roof, it is possible to create a roof appearance that leaves an impression on the viewer and has a solid feel and texture.

In the present invention, the airless spray coating device includes an air jetting mechanism near the nozzle portion. The air ejected in the direction of the object to be coated by the above mechanism forms an air current around the outer circumference of the spray paint that is ejected toward the object from the tip of the nozzle, suppressing the scattering of the spray paint generated during painting to the surrounding area. At the same time, it has the effect of improving the solid appearance and texture of the roof. The state of the airflow formed by this air jetting mechanism is not particularly limited, but may be, for example, curtain-like, spiral-like, or the like.

<Painting>
In the decorative coating method of the present invention, the paint (X) preferably has a viscosity during coating of 50 to 150 KU, preferably 80 to 130 KU. When the viscosity of the coating composition is within the above range during coating, there is an advantage that a solid and impressive roof appearance can be obtained while ensuring good coating workability. The viscosity of the coating composition shall be measured according to JIS K 5600-2-2 Stormer viscometer method.

The amount of paint (X) to be applied can vary depending on the composition of the paint composition used, the type of roof, etc., but it is 10 to 500 g/m ² , preferably 20 to 300 g/m in terms of nonvolatile content. A value within the range of ² is preferable. The coating composition may be applied multiple times so that the amount of application falls within the above range.

The formed coating film can be dried at room temperature depending on the composition of the coating composition used, but if necessary, forced drying or heating drying may be performed.

<Undercoat painting process>
In the decorative coating method of the present invention, an undercoat colored paint may be applied before applying the paint (X).

The undercoat colored paint is not particularly limited and can be selected as appropriate depending on the type and condition of the surface to be coated or the desired roof appearance.Also, the paint normally used as the top coat may be applied as the undercoat colored paint. It is also possible to do so.

As the above-mentioned undercoat coloring paint, conventionally known ones can be used without limitation, but it can be selected as appropriate depending on the type and condition of the surface to be coated. For example, acrylic resin, acrylic silicone resin, polyolefin resin, The resin binder is water-based or solvent-based resin such as silicone resin, polyurethane resin, epoxy resin, phenol resin, polyester resin, alkyd resin, biodegradable resin, etc., and paint containing pigment is used as the resin binder. can be mentioned. In particular, it is preferable to use a paint containing a water-based resin.

Pigments included in the undercoat colored paint include conventionally known pigments such as coloring pigments, extender pigments, glitter pigments, and antirust pigments, and should be selected as appropriate depending on the desired appearance and texture of the roof. Can be done.

The undercoat colored paint can be applied using a coating method known per se. Although the coating amount can be adjusted as appropriate, it is preferable that the coating thickness be less than the complete concealment coating thickness. This is because the roof has a unique appearance in which the underlying roof material, the paint film made of the undercoat colored paint, and the pattern made of the colored paint particles are fused together.

The formed undercoat film can be dried by heating, forced drying, or room temperature drying, depending on the type of undercoat colored paint.

The method of the present invention may optionally include a step of applying a top coat clear paint after coating and drying the coating composition containing colored paint particles.

The texture, depth, and durability of the roof can be improved by applying a clear top coat.

Examples of such top coat clear paints include acrylic resins, acrylic silicone resins, polyolefin resins, silicone resins, polyurethane resins, epoxy resins, phenolic resins, polyester resins, alkyd resins, and Examples include water-based or solvent-based paints containing a water-based or solvent-based resin as a resin binder, such as a degradable resin, and it is preferable to use a water-based paint containing a water-based resin.

The top coat clear paint can be applied using a known coating method. The formed clear coating film can be dried by heating drying, forced drying, or normal temperature drying, depending on the type of clear coating used.

EXAMPLES Hereinafter, the present invention will be explained in more detail with reference to Examples, but the present invention is not limited only to these Examples. In addition, "parts" and "%" in the following examples mean "parts by mass" and "% by mass", respectively.

<Production of emulsion for colored paint particles>
Manufacturing example 1
285 parts of deionized water and 1 part of "Nukol 707SF" (Note 1) were added to a 2-liter four-necked flask, and after purging with nitrogen, the flask was kept at 85°C. 3% of a pre-emulsion prepared by emulsifying the ingredients with the following composition and 41 parts of 123 parts of an initiator aqueous solution prepared by dissolving 3 parts of ammonium persulfate in 120 parts of deionized water were added to the solution. From 20 minutes after completion, the remaining pre-emulsion and ammonium persulfate aqueous solution were dripped into the flask over 4 hours.
Deionized water 368 parts Styrene 150 parts Methyl methacrylate 410 parts n-butyl acrylate 240 parts 2-ethylhexyl acrylate 150 parts Diacetone acrylamide 20 parts 2-hydroxyethyl acrylate 25 parts Acrylic acid 5 parts "Nucor 707SF" (Note 1) 66 After the completion of partial dropping, this was held at 85°C for another 2 hours, and then the temperature was lowered. When the temperature reached 40 to 60°C, the pH was adjusted with aqueous ammonia to obtain an emulsion (a1) with a solid content of 55%. . The average particle diameter of emulsion (a1) was 175 nm, and the pH was 8.3.
(Note 1) "Nukol 707SF": Trade name, manufactured by Nippon Nyukazai Co., Ltd., anionic surfactant having a polyoxyethylene chain, non-volatile content 30%.

<Production of emulsion for coating film-forming components>
Manufacturing example 2
285 parts of deionized water and 1 part of "Nukol 707SF" (Note 1) were added to a 2-liter four-necked flask, and after purging with nitrogen, the flask was kept at 85°C. 3% of a pre-emulsion prepared by emulsifying the ingredients with the following composition and 41 parts of 123 parts of an initiator aqueous solution prepared by dissolving 3 parts of ammonium persulfate in 120 parts of deionized water were added to the solution. From 20 minutes after completion, the remaining pre-emulsion and ammonium persulfate aqueous solution were dripped into the flask over 4 hours.
Deionized water 368 parts Styrene 150 parts Methyl methacrylate 400 parts n-butyl acrylate 360 parts 2-ethylhexyl acrylate 67 parts Diacetone acrylamide 10 parts 2-hydroxyethyl acrylate 10 parts Acrylic acid 3 parts "Nucor 707SF" (Note 1) 66 After the completion of the addition, the mixture was maintained at 85°C for another 2 hours, and then the temperature was lowered to 40 to 60°C. Next, the pH was adjusted with aqueous ammonia to obtain an emulsion (a2) with a solid content of 55%. The emulsion (a2) had an average particle diameter of 180 nm and a pH of 8.0.

<Manufacture of enamel clear for colored paint particles>
Manufacturing example 3
An enamel clear (b1) for colored paint particles was obtained by charging the following components into a 1 liter stainless steel container and stirring and mixing them using a stirrer for 30 minutes.
55% emulsion (a1) obtained in Production Example 1 450 parts "TEXANOL" (Note 2) 30 parts "DISPER BYK-190" (Note 3) 7 parts "BYK-028" (Note 4) 3 parts "ADEKA NOL UH-"420'' (Note 5) 3 parts (Note 2) ``TEXANOL'': trade name, manufactured by Eastman Chemical Company, 2,2,4-trimethylpentanediol monoisobutyrate, film-forming aid,
(Note 3) "DISPER BYK-190": Product name, manufactured by BYK Chemie, pigment dispersant, (Note 4) "BYK-028": Product name, manufactured by BYK Chemie, antifoaming agent,
(Note 5) "Adekanol UH-420": Trade name, manufactured by Adeka Corporation, urethane-modified thickener.

<Production of white paint for colored paint particles>
Production example 4
In a 1 liter stainless steel container, 500 parts of the enamel clear (b1) obtained in Production Example 3 above was added, and 125 parts of titanium dioxide was added thereto.The mixture was stirred and mixed for 30 minutes using a stirrer to prepare a material for colored paint particles. A white paint (b2) was obtained.

<Manufacture of colored paint particles>
Manufacturing example 5
In a 1-liter stainless steel container, enamel clear (b1) obtained in Production Example 3 above, white paint (b2) obtained in Production Example 4 above, and color paste for water-based paints manufactured by Yokohama Kasei Co., Ltd. (trade name, Unilant) 88) to the 2009 E edition standard paint color EN-85 published by the Japan Paint Manufacturers Association, and then add 300 parts of a 2% sodium alginate aqueous solution to make it uniform. By stirring and mixing for 10 minutes, an aqueous coating composition for colored coating particles was obtained.
Prepare another 4 liter stainless steel container and add 1 part of a calcium ion-containing aqueous medium (an aqueous medium obtained by stirring 2000 parts of deionized water, 3 parts of calcium propionate, and 3 parts of calcium hydroxide until homogeneous). , 650 parts of the water-based paint composition for colored paint particles were gradually dropped into the container while stirring at a rotation speed of 1000 rpm using a stirring blade having a diameter of 75 mm, to form pale gray colored paint particles. generated. Next, the liquid in the container was stirred for another 5 minutes at the same rotational speed, and then filtered using a 200-mesh wire mesh to obtain a colored paint particle liquid (A-1). The obtained colored paint particle liquid (A-1) had a gray color when visually observed, an average particle diameter of 3 mm, and a solid content of 20%.

Manufacturing example 6
In Production Example 5 above, a colored paint particle liquid (A-2) with a visual color of maroon, an average particle diameter of 3 mm, and a solid content of 20% was carried out in the same manner as in Production Example 5 except that the standard color was changed to E0570D. ) was manufactured.

Manufacturing example 7
A colored paint particle liquid (A-3) was obtained in the same manner as in Production Example 5, except that the rotation speed of the stirring blade was 2000 rpm and the stirring time was 15 minutes. The obtained colored paint particle liquid (A-3) was visually observed as gray in color, had an average particle diameter of 1 mm, and had a solid content of 20%.

Production example 8
A colored paint particle liquid (A-4) was obtained in the same manner as in Production Example 5, except that the rotation speed of the stirring blade was 2000 rpm and the stirring time was 15 minutes. The colored paint particle liquid (A-4) obtained was visually observed to be maroon in color, had an average particle diameter of 1 mm, and had a solid content of 20%.

Production example 9
A colored paint particle liquid (A-5) was obtained in the same manner as in Production Example 5, except that the rotation speed of the stirring blade was 1000 rpm and the stirring time was 3 minutes. The obtained colored paint particle liquid (A-5) was visually observed as gray in color, had an average particle diameter of 4 mm, and had a solid content of 20%.

Production example 10
A colored paint particle liquid (A-6) was obtained in the same manner as in Production Example 6, except that the rotation speed of the stirring blade was 1000 rpm and the stirring time was 3 minutes. The resulting colored paint particle liquid (A-6) was visually observed to be maroon in color, had an average particle diameter of 4 mm, and had a solid content of 20%.

<Manufacture of water-based clear paint for film-forming components>
Production example 11
A water-based clear paint (B-1) was obtained by sequentially charging the following components into a 2-liter stainless steel container and stirring and mixing them using a stirrer for 30 minutes until uniform.
55% emulsion (a2) obtained in Production Example 2 825 parts "TEXANOL" (Note 2) 50 parts "BYK-028" (Note 4) 10 parts "Primal ASE60" (Note 6) 3 parts Calcium propionate 0.7 Part (Note 6) "Primal ASE60": Trade name, manufactured by Rohm and Haas, polyacrylic acid-based viscosity modifier.

<Manufacture of paint containing colored paint particles>
Production example 12
A paint containing colored paint particles (X-1) was produced by charging the ingredients listed below in a 500 ml stainless steel container with stirring, and then stirring until uniform.
20% colored paint particle liquid (A-1) 75 parts 20% colored paint particle liquid (A-2) 25 parts 50% aqueous clear (B-1) 200 parts 10% adipic acid dihydrazide liquid 2.5 parts "SN thickener"612" (Note 7) 0.2 parts (Note 7) "SN Thickener 612": Trade name, manufactured by San Nopco, urethane associative thickener.

Production examples 13 to 18
Colored paint particle-containing paints (X-2) to (X-7) were manufactured in the same manner as in Production Example 12, except that the formulations were as shown in Table 1 below.

<Painting test>
Example 1
Stone chip steel plate with dimensions of 600 x 900 x 3 mm ("T-Roof Classic Dark Brown": product name, manufactured by Lixil Co., Ltd., roofing material made of aluminum/zinc alloy steel plate sprayed with brown, black, and ocher natural stone chips. ) was used as a base material, and a "two-component water-based epoxy sealer" (trade name: Ares water-based epoxy sealer, manufactured by Kansai Paint Co., Ltd.) was applied with a roller to a coating amount of 100 g/m ² and dried. Furthermore, a black water-based acrylic silicone resin paint (trade name: water-based Zolacoat EX intermediate coat) was applied twice with a roller to a coating amount of 100 g/ ^m2 in non-volatile content as an undercoat coloring paint, and then dried. is the object to be coated. On the object to be coated, although a continuous layer was formed in the coating film using the undercoat colored paint, the appearance of the base material was visible and the texture of stone grains remained.

Paint containing colored paint particles (X-1) was diluted with water to a viscosity of 110 KU, the application pressure was adjusted to 0.30 MPa, and an airless machine was installed with an air curtain head (manufactured by Seiwa Sangyo Co., Ltd.). The object to be coated was coated with a coating amount of 250 g/ ^m2 in non-volatile matter using a spray coating device, and dried for 7 days at a temperature of 20°C and a relative humidity of 60% to form a decorative roofing material. Obtained.

Examples 2 to 10 and Comparative Examples 1 to 6
Painting was carried out in the same manner as in Example 1, except that the type of paint containing colored paint particles used, its viscosity, and the pressure of the airless coating device were as described in Table 1, to obtain a decorative roofing material.

Example 11
In Example 1, painting was carried out in the same manner as in Example 1, except that the base material was asphalt shingle (trade name "ALMA SA301 Black AR", manufactured by Nichiha Corporation, black, treated with adhesion of stone grains), and a decorative roof was formed. I got the material. On the object to be coated, although a continuous layer was formed in the coating film using the undercoat colored paint, the appearance of the base material was visible and the texture of stone grains remained.

Example 12
Example 1 was carried out in the same manner as in Example 1, except that the base material was a flat decorative slate board ("Color Best Grassa Black": trade name, manufactured by Keimu Co., Ltd., black, no stone grain adhesion treatment). Painting was performed to obtain decorative roofing material. On the object to be coated, although a continuous layer was formed in the coating film using the undercoat colored paint, the appearance of the base material was visible through it.

Comparative example 7
In Example 1, painting was carried out in the same manner as in Example 1, except that the air curtain head was removed from the airless painting apparatus, and a decorative roofing material was obtained.

<Evaluation results>
(*) Painting workability In the painting test, the painting workability when airless spray painting a paint containing colored paint particles was evaluated based on the following criteria.
◎: Good atomization during spray application, making painting work very easy.
○: Slightly good atomization during spray application, making painting work easier.
△: Atomization during spray application is somewhat poor, making painting work somewhat difficult.
×: Poor atomization during spray application, making painting work difficult.

(*) In the scattering coating test, the scattering properties when airless spray painting a paint containing colored paint particles were evaluated using the following criteria.
◎: Very little paint scattering outside the test coated plate.
○: There is little paint scattering outside the test coated plate.
△: There was a lot of paint scattering outside the test coated plate.
×: Extremely large amount of paint scatters to the outside of the test coated plate.

(*) Appearance The coated plate prepared for the test was visually evaluated from a place 1 m away.
◎: Has a solid feel and texture,
○: There is a profound feeling and texture.
△: Heavy feeling, lack of texture,
×: No sense of solidity or texture, and looks monotonous.

Claims (5)

A method for decoratively painting a roof using a paint composition, the method comprising:
The paint composition is a paint (X) containing colored paint particles containing colored paint particles obtained by granulating a colored paint, a binder resin, and water, and the nonvolatile content of the colored paint particles is less than the nonvolatile content of the paint (X). is within the range of 5 to 65% by mass,
The paint (X) is applied at a discharge pressure of 0.0 using an airless spray coating device equipped with an air jet mechanism near the nozzle. Paint within the range of 10 to 1.0 MPa,
How to paint a roof decoration. 2. The decorative painting method according to claim 1, wherein the roof material is a material to which stone particles have been attached. The decorative coating method according to claim 1 or 2, wherein the average particle diameter of the colored paint particles is within the range of 0.1 to 10 mm. The decorative coating method according to any one of claims 1 to 3, wherein the paint (X) containing colored paint particles has a viscosity within the range of 50 to 150 KU. The decorative coating method according to any one of claims 1 to 4, wherein an undercoat colored paint composition is applied before applying the paint (X) containing colored paint particles.