JP2000297254A - Coating composition for forming patterned coating film, method for forming patterned coating film and coated plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a coating composition which can improve the collapse of the outline of a transferred pattern portion, when a patterned coating film is formed on a wall material, or the like, related to inorganic (ceramic) system.metal siding, by controlling the coating time residual viscosity and yield value of the coating material to specific ranges, respectively. SOLUTION: This coating composition for forming patterned coating films has a coating time residual viscosity of 0.1 to 5 Pas (25 deg.C) of the coating material and a yield value of 5 to 30 Pa (25 deg.C). The coating composition preferably has a coating liquid surface tension of 25 to 45 dyn/cm. The composition comprises a resin such as an acrylic resin emulsion and a pigment such as titanium dioxide, and preferably further contains a viscosity-adjusting agent such as a modified polyacrylsulfonic acid salt-based viscosity-adjusting agent and a surfactant such as an N-alkylpyrrolidone-based surfactant in order to adjust the coating time residual viscosity, yield value and surface tension to the above ranges, respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating composition for forming a patterned coating film in which the physical properties and viscosity of the coating film are controlled.
In addition, a pattern coating on the base coat, which reduces the displacement of the inside of the transfer pattern layer by the coating composition for forming a pattern coating by using the relief coating transfer roll to form a pattern film, thereby enabling uniform control of the thickness of the design pattern portion. The present invention relates to a forming method and a painted plate.

[0002]

2. Description of the Related Art Inorganic (ceramic) and metal siding-related wall materials, exterior building materials, interior building materials, metal building materials (hereinafter referred to as "substrates to be coated") include roll coaters, flow coaters, and sprays. The paint is applied by utilizing the method.

[0003] In the case of using a roll coater, if the surface of the transfer roll is made smooth, it becomes possible to apply a uniform coating over the entire substrate to be coated, as in the case of spray coating.

In addition, if a convex portion for providing a design pattern is formed on the surface portion of the transfer roll, it is possible to form a design coating film capable of forming a pattern according to the convex portion on the surface portion of the transfer roll. Becomes possible. By using a roll coater having such a roll (hereinafter, referred to as a “letter transfer roll”), it is possible to continuously apply a coating film having a design property.

Japanese Patent Application Laid-Open No. 9-99261 discloses a roll coater capable of always maintaining a stable coating film thickness without causing an increase in viscosity and curing of the coating material supplied to the surface even when the transfer roll is stopped. And a coating method using the same.

[0006]

When a delicate design pattern is to be transferred using the above-mentioned coating method,
The coating composition for forming a pattern coating film applied on the base coat by the letterpress transfer roll, from the convex portion of the letterpress transfer roll,
The contour of the transfer pattern may be collapsed due to the collapse of the contour protruding in the lateral direction. Further, such a collapse of the contour of the transfer pattern causes a roping phenomenon in which the thickness of the transfer pattern becomes uneven, and as a result, the transferred pattern becomes unclear. In addition, design residue may be deteriorated due to unpainted portions and uneven coating. In order to stably form a good coating film, it is necessary to consider the coating composition for forming a patterned coating film.

[0007]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies in view of the above-mentioned problems, and as a result, it has been found that the contour of the transferred pattern portion due to the coating composition for forming a pattern coating film formed by the letterpress transfer roll is distorted. The present invention has been found to be able to be improved by controlling the viscosity and interfacial properties of the coating composition for forming a coating film, in particular, by controlling the viscosity of the coating composition for forming a patterned coating film.

[0008] 1. Residual viscosity at the time of application of paint is 0.1-5P
as (25 ° C.), a coating composition for forming a patterned coating film having a yield value of 5 to 30 Pa (25 ° C.).

[0009] 2. The above-mentioned paint composition for forming a patterned coating film, wherein the coating composition has a surface tension of 25 to 45 dyn / cm.

[0010] 3. A method for forming a pattern coating film on a substrate to be coated on which a base coat has been formed, using the above-described coating composition for forming a pattern coating film by a letterpress transfer roll.

4. The above-mentioned method for forming a patterned coating film, wherein after the formation of the patterned coating film, a paint for forming a clear coating film is further formed as an overcoating film.

5. The above method for forming a patterned coating film, wherein the substrate to be coated has irregularities.

6. The above method for forming a patterned coating film, wherein an undercoating film is formed on the substrate to be coated.

7. A coated plate on which a coating film is formed by the above-mentioned pattern coating film forming method.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the present invention will be described below in detail.

The coating composition for forming a patterned coating film The coating composition for forming a patterned coating film of the present invention is applied on a base coat for forming a patterned coating film, and is applied by a roll coater having a relief transfer roller described later. In the pattern formation, when a letterpress roll is used, a partial pattern corresponding to the convex portion of the roll is formed, but when a transfer roll having a smooth surface is used, a coating film is formed on the entire surface. You. The coating composition for forming a pattern coating film of the present invention is particularly suitable for partial pattern formation using a letterpress transfer roll. The coating composition for forming a patterned coating film has a residual viscosity of 0.1 to 5 Pas when applied,
The yield value is between 5 and 30 Pa.

The residual viscosity at the time of coating and the yield value are determined based on the collapse of the contour due to the stress applied from the transfer roll when the paint composition for forming a patterned coating film is transferred by the transfer roll, particularly the contour in the lateral direction. It shows the resistance of the coating composition for forming a patterned coating film to collapse. When the residual viscosity is less than 0.1 Pas, there are problems such as paint scattering, sagging, and foaming at the time of pattern transfer,
If it exceeds 5 Pas, there are problems such as poor leveling and roping. Preferably, 0.1 to
1 Pas.

When the yield value is less than 5 Pa, there is a problem that the paint is scattered or sagged at the time of pattern transfer, and when it exceeds 30 Pa, there is a problem that roping occurs. Preferably, it is 5 to 20 Pa. The residual viscosity at the time of coating and the yield value were 25 ° C.
It was measured under the following conditions. The residual viscosity at the time of coating and the yield value can be determined by a cone plate type rotational viscometer.

The above-mentioned coating composition for forming a patterned coating film can have a residual viscosity at the time of coating and a yield value within the above-mentioned ranges by containing a viscosity modifier. Specific examples of the viscosity modifier include a cellulose derivative such as hydroxyethyl cellulose, a polyacrylic acid such as a modified polyacrylsulfonic acid salt, a polyether such as a modified polyether urethane, and an organic bentonite. it can.

The surface tension of the coating composition for forming a patterned coating film is preferably 25 to 45 dyn / cm. If the surface tension is less than 25 dyn / cm, bleeding occurs and the pattern becomes unclear.
If it exceeds 5 dyn / cm, there are problems such as unpainted portions and uneven coating, resulting in poor design. Preferably, it is 30 to 40 dyn / cm.

On the other hand, the surface tension of a dry coating film (pattern coating film) obtained from the above-mentioned coating composition for forming a pattern coating film is 30 to 5
It is preferably 0 dyn / cm. When the surface tension of the dried coating film is less than 30 dyn / cm, there is a problem such as repelling of the clear coating film, and when the surface tension exceeds 50 dyn / cm, there is a problem that the adhesion to the base coat is reduced. is there. More preferably, 30 to 40 dyn
/ Cm.

It is preferable that the relationship between the surface tension of each of the composite films to be formed satisfies the following conditions (A) and (B). Condition (A): the value of (the surface tension of the dried coating film of the coating material for forming the base coat)-(the surface tension of the coating liquid of the coating composition for forming the patterned coating film) is 0 to 10 dyn / cm, more preferably
0 to 5 dyn / cm. Condition (B): the value of (the surface tension of the dried coating film of the coating composition for forming a patterned coating film) − (the surface tension of the coating liquid of the coating film for forming a clear coating film) is 0 to 10 dyn / cm, more preferably
0 to 5 dyn / cm.

The effect of the present invention is exhibited when the surface tension of the coating composition for forming a patterned coating film satisfies the above conditions. The larger the difference between the surface tensions in the above conditions (A) and (B), the less the contour of the transfer pattern portion collapses. However, if the difference is too large, the adhesion between the coating films is affected. If the difference in the surface tension exceeds each value, the adhesion between the two coating films will be inhibited. The coating composition for forming a patterned coating film can have a surface tension within the above range by containing a surfactant. As specific examples of the surfactant, a sulfonate, an anionic surfactant such as a fluorocarbon group-containing,
Examples thereof include cationic surfactants such as long-chain polyamines and PEO-added long-chain quaternary ammonium salts, and nonionic surfactants such as N-alkylpyrrolidone and polyoxyethylene-added silicon. Preferably, HLB
Nonionic surfactants such as 5 to 15 N-alkylpyrrolidone and polyoxyethylene-added silicon.

The coating composition for forming a patterned coating film contains a resin and a pigment. The resin used in the coating composition for forming a patterned coating film is dissolved or dispersed in a medium containing an organic solvent and / or water. Specific resins include, for example, an organic solvent type such as an acrylic resin, a silicon-modified acrylic resin, an alkoxysilane resin, a polyester resin, an alkyd resin, an epoxy resin, a fluororesin, a urethane resin, or a water-soluble, water-dispersible (emulsion) type aqueous resin. Types include, acrylic resin, silicone-modified acrylic resin, polyester resin is more preferable, particularly,
An acrylic resin or an emulsion resin of a silicon-modified acrylic resin is preferably used. These can also be used by mixing with a crosslinking agent such as an amino resin, a (block) polyisocyanate compound, or an amine. Further, a moisture-curable urethane resin or the like can be used. Further, these resins are not limited to one kind, and may be used in combination of two or more kinds.

Examples of the acrylic resin include those obtained by copolymerizing an acrylic monomer and, if necessary, another ethylenically unsaturated monomer. Acrylic monomers include acrylic acid or methacrylic acid methyl, ethyl, propyl, n-butyl, i-butyl, t-
-Butyl, 2-ethylhexyl, lauryl, phenyl,
Benzyl, 2-hydroxyethyl, 2-hydroxypropyl ester, Plaxel FM-1 (methacrylic acid 2-
Adduct of hydroxyethyl and polycaprolactone, manufactured by Daicel Chemical Industries, Ltd.), acrylamide, and N
-Methylol acrylamide, acrylonitrile and the like. Examples of the other ethylenically unsaturated monomers include styrene, α-methylstyrene, itaconic acid, maleic acid, and vinyl acetate.
In addition, it may contain, for example, divinylbenzene, (meth) acrylate of polyhydric alcohol, and the like.

As the silicon-modified acrylic resin,
In addition to those obtained by grafting an organopolysiloxane to the acrylic resin, and those obtained by copolymerizing an alkoxysilane monomer having an ethylenically unsaturated group and an ethylenically unsaturated monomer, in the presence of alkoxysilane or a hydrolyzed condensate thereof And those obtained by polymerizing an acrylic monomer having a functional group that reacts with an alkoxysilyl group with an ethylenically unsaturated monomer. Examples of the alkoxysilane monomer having an ethylenically unsaturated group include 3-methacryloxypropyltrimethoxysilane, 3-methacryloxypropyltriethoxysilane,
Examples thereof include 3-acryloxypropyltrimethoxysilane, 3-acryloxypropyltriethoxysilane, and 3-methacryloxybutyltrimethoxysilane.

The above alkoxysilane resin includes tetraalkoxysilane, alkyltrialkoxysilane,
Resins composed of condensates such as dialkyldialkoxysilanes can be mentioned.

Examples of the polyester resin include a saturated polyester resin and an unsaturated polyester resin. These can be obtained, for example, by heat-condensing a polybasic acid and a polyhydric alcohol. Examples of the polybasic acid include saturated polybasic acids such as phthalic anhydride, terephthalic acid and succinic acid, and unsaturated polybasic acids such as maleic acid, maleic anhydride and fumaric acid. Examples of the polyhydric alcohol include dihydric alcohols such as ethylene glycol and diethylene glycol, and trihydric alcohols such as glycerin and trimethylolpropane. An alkyd obtained by reacting the above polybasic acid and polyhydric alcohol with a denaturant such as fats and oils and fatty acids (soybean oil, linseed oil, stearic acid, etc.) and natural resins (rosin, succinic acid, etc.). Resin can be used.

As the epoxy resin, for example, a resin obtained by a reaction between bisphenol and epichlorohydrin can be used. Examples of the bisphenol include bisphenol A and bisphenol F. Specific examples of the bisphenol epoxy resin include Epicoat 828, Epicoat 1001, Epicoat 1004, Epicoat 1007, Epicoat 100
9 (all manufactured by Shell Chemical Co., Ltd.).
Among these bisphenol type epoxy resins, when used as an aqueous type resin, Epicoat 1001 and Epicoat 1004 (both manufactured by Shell Chemical Co., Ltd.) are preferable from the viewpoint of excellent water dispersibility and drying property. Epoxy resins are used alone or in combination of two or more, and the epoxy equivalent of these epoxy resins is not particularly limited.

The fluororesin is any one of vinylidene fluoride resin and ethylene tetrafluoride resin or a mixture thereof, a fluoroolefin and a hydroxyl group-containing polymerizable compound, and other copolymerizable vinyl compounds. Examples include those composed of various fluorine-based copolymers obtained by copolymerizing monomers.

Examples of the urethane resin include those having a urethane bond selected from various polyol components and a polyisocyanate compound. Examples of the polyisocyanate compound include 2,4-tolylene diisocyanate (2,4-TDI), 2,6-tolylene diisocyanate (2,6-TDI), and a mixture thereof (TDI), diphenylmethane-4,4′- Diisocyanate (4,4'-MDI), diphenylmethane-2,
4′-diisocyanate (2,4′-MDI), and a mixture thereof (MDI), naphthalene-1,5-diisocyanate (NDI), 3,3′-dimethyl-4,4′-
Use of biphenylene diisocyanate (TODI), xylylene diisocyanate (XDI), dicyclohexylmethane diisocyanate (hydrogenated HDI), isophorone diisocyanate (IPDI), hexamethylene diisocyanate (HDI), hydrogenated xylylene diisocyanate (HXDI), etc. Can be.

In the case of synthesizing the above-mentioned acrylic resin, silicone-modified acrylic resin and fluororesin, they are synthesized by copolymerization and emulsion polymerization, but usually an initiator is used. Examples are inorganic peroxide initiators such as hydrogen peroxide, ammonium persulfate, potassium persulfate, t-butyl hydroperoxide,
mention may be made of organic peroxide initiators such as t-amyl hydroperoxide, cumene hydroperoxide, tetralin hydroperoxide, diisopropyl hydroperoxide and azo-based initiators such as 4,4'-azobis (4-cyanovaleric acid) Can be. Further, as the surfactant used for the emulsion copolymerization, a conventional nonionic or anionic surfactant can be used.

Examples of the pigments include inorganic coloring pigments such as titanium dioxide, iron oxide, iron hydroxide, carbon black, and graphite, azo lake pigments, phthalocyanine pigments, indico pigments, perylene pigments, quinophthalones. -Based pigments, organic pigments such as dioxazine-based pigments, quinacridone-based pigments, isoindolinone-based pigments, aluminum flake pigments, mica pigments, graphite pigments, alumina flake pigments, metal titanium flakes, stainless flakes, plate-like iron oxide, phthalocyanine flakes Alternatively, a brilliant pigment such as a metal plating resin flake or the like, an extender pigment or the like may be used. These can be used in combination of two or more.

The weight ratio of the solid content of the resin and the pigment in the coating composition for forming a patterned coating film is from 1/10 to 1000/1.
It is preferably 0. If the ratio is less than 1/10, there is a problem such as a decrease in adhesion to the clear coating film.
If it exceeds 00/10, there is a problem that the pattern becomes unclear. More preferably, it is 5/10 to 100/10.

The coating composition for forming a pattern coating film comprises a resin,
It can be obtained by dissolving and dispersing a pigment, a surfactant and, if necessary, other additives in a solvent such as an organic solvent or water.

[0036] be coated substrates used in the decorative paint film forming method decorative paint film forming method of the present invention is not particularly limited, inorganic (ceramic) type, metal siding associated wall materials, exterior building materials, building materials for interior , Can be preferably applied to those used as metal building materials,
In particular, inorganic building materials such as a scallop board are preferable. In order to improve the design property, a substrate to be coated having unevenness can be used.

An undercoating film is generally formed on the surface of the substrate to be coated in order to improve durability and design, but the undercoating film may be omitted depending on the application. The undercoating film is formed by performing a putty repair on the substrate to be coated, if necessary, applying an undercoating material, and drying the coating under predetermined conditions. The application of the undercoat is performed by a roll coater,
It can be performed using a flow coater, a spray or the like. The dry coating amount of the undercoat paint is 30 to 30 times at a time.
0 g / m ² is preferred. More preferably, three at a time
0 to 100 g / m ² . As the undercoat paint,
Although not particularly limited, it is preferable to use one containing the resin and the solvent contained in the coating composition for forming a patterned coating film. In addition, as the undercoat paint, the paint for forming a base coat can be used as it is or with a different hue.

A base coat is formed on the substrate on which the undercoat film has been formed as required. The base coat forming paint used for forming the base coat preferably has a floor slip resistance coefficient of 0.1 to 1, and 0.2 to 1
0.4 is more preferred. When the floor slip resistance coefficient is less than 0.1, there are problems such as collapse of the contour of the transfer pattern and occurrence of roping, and when it exceeds 1, the problem such as wear of the pattern of the relief transfer roll. There is. The floor sliding resistance coefficient referred to here is JIS A140
7 Determined based on “Slip test method for floor (pendulum type)”. Specifically, first, a test piece is prepared using the paint for forming a base coat. Next, a coating composition for forming a pattern coating film described later is applied to the test piece contacting portion of the slide piece. Then, a floor slip resistance coefficient is obtained using the test piece and the slip piece. The preparation of the test piece and the slip piece and the determination of the floor slip resistance coefficient were performed according to JIS A
This is performed based on 1407.

The base coat-forming coating composition can contain the matting agent having an average particle size of 1 to 500 μm, so that the floor sliding resistance coefficient can be set in the above range. Specific examples of the matting agent include calcium carbonate, barium sulfate, aluminum stearate, finely divided silica, alumina, fine polyethylene particles, silica sand and the like. Preferred are calcium carbonate, finely divided silica, and polyethylene fine particles having an average particle size of 10 to 100 μm.

In the base coat forming paint, it is preferable that the surface tension of the dried coating film obtained therefrom is not smaller than the surface tension of the coating liquid for the pattern forming paint as described above. Specifically, (Surface tension of the dried coating film)
-The value of (the surface tension of the coating liquid of the pattern forming coating) is 0.
-10 dyn / cm, preferably 0-5 dy / cm
n / cm is more preferred.

The above-mentioned base coat-forming paint uses the surfactant described in the above-mentioned pattern paint-forming paint composition and controls the surface tension by selecting the kind and amount thereof. Can be.

The base coat forming paint contains a resin and a pigment. As the resin and the pigment, those described in the above-mentioned coating composition for forming a pattern coating film are applied. Preferred as the resin are an acrylic resin, a silicon-modified acrylic resin, and a polyester resin.

As the pigment and the solvent used as the base coat forming paint, those used in the pattern paint forming composition can be used. The formation of the base coat is performed by using a roll coater, a flow coater, a spray or the like as in the case of the undercoat paint, and is performed by drying under predetermined conditions. The dry coating amount of the base coat forming paint is preferably from 10 to 100 g / m ² each time. More preferably, the amount is 10 to 50 g / m ² at a time.

On the base coat thus formed, a pattern coat of a predetermined design is formed by a roll coater. In the pattern formation, when a letterpress roll is used, a partial pattern corresponding to the convex portion of the roll is formed, but when a transfer roll having a smooth surface is used, a coating film is formed on the entire surface. You. The coating composition used to form the pattern coating is the above-described coating composition for forming a pattern coating.

The relief transfer roll used here has a well-known structure in which a transfer layer is formed on the outermost layer of a shaft formed of aluminum or the like, and a surface portion of the transfer layer is formed with a concavo-convex shape for imparting designability. Transfer roll can be used. The surface of the transfer layer is a polymer of a polymerizable monomer or chloroprene rubber, ethylene-chloroprene rubber, butyl rubber,
It is formed of silicone rubber, fluorine rubber, acrylic rubber, polysulfide rubber, natural rubber, butadiene rubber, isoprene rubber, or a sponge (foam) of these rubbers or a reaction product of these rubber components and a photopolymerizable monomer. . If a polymer of a polymerizable monomer or a rubber, a rubber sponge or a reaction product of a rubber component and a photopolymerizable monomer is used as a transfer layer of a transfer roll, the surface of the rubber transfer roll has an uneven shape that imparts a design property. , And can be easily formed by ultraviolet rays or laser beams, and have excellent durability. In particular, a transfer layer composed of a rubber component and a photopolymerizable monomer is suitable for forming a concavo-convex shape that imparts a design property to the transfer layer by photopolymerization by ultraviolet irradiation. The transfer layer provided with the concavo-convex shape imparting this design may have the transfer layer wound in advance on a transfer roll, and in the case of a transfer roll having a long circumference, the transfer layer is easily formed on the transfer roll. A polymer of such a polymerizable monomer or a reaction product of a rubber, a foam of rubber or a rubber component and a photopolymerizable monomer can be mounted or affixed, and is suitable for use as a transfer layer of a transfer roll. When the transfer layer is a rubber sponge (foam), a sponge having a bubble diameter of 0.01 to 0.6 mm is preferable. By forming a plurality of grooves having an uneven shape of 0.01 to 0.5 mm in a mesh shape on the surface of the convex portion of the roll transfer layer, the paint supplied from the paint tank can be easily maintained at a predetermined film thickness. Becomes As the roll, a known material other than the above materials can be used. A well-known roll coater can also be used for the roll coater provided with the letterpress transfer roll.

As described above, the coating composition for forming a pattern coating is applied by a roll coater and dried under predetermined conditions to form a pattern coating of a predetermined design. The coating conditions are preferably set so that the dry film thickness of the pattern coating film is 10 to 30 μm.

On the pattern paint film thus obtained,
Further, a clear coating film is formed. The surface tension of the clear coating film forming paint is preferably 25 to 45 dyn / cm. The surface tension of the clear coating film-forming paint can be controlled by selecting the type and amount of the surfactant contained therein as in the case of the base coat-forming paint. As such a surfactant, the same ones as described for the base coat forming paint can be used.

Further, the above-mentioned clear coating film forming paint is obtained when the dry coating film obtained therefrom has a thickness of 10 μm.
UV transmittance at a wavelength of 300 to 320 nm is 0 to 5
0%, preferably 0 to 20%. If the ultraviolet transmittance exceeds 50%, there is a problem that the base coat and the pattern coating film are discolored and discolored by ultraviolet rays.

The above-mentioned clear coating film-forming paint contains the benzotriazole-based, benzophenone-based, phenyl salicylate-based, oxazoline-based ultraviolet absorbers, and the hindered amine-based light stabilizers, so that the ultraviolet transmittance can be increased. Range.

The clear coating film forming paint contains a resin. As the resin, those described for the base coat forming paint are applied. Considering weather resistance, acrylic resin, silicone-modified acrylic resin,
Alkoxysilane resins, urethane resins, and fluororesins are preferred.

The above-mentioned clear coating film forming paint may contain a matting agent or an aggregate in order to enhance the design. As the above-mentioned matting agent, a matting agent contained in a paint for forming a base coat can be used. By including the matting agent, the form of the pattern can be increased as a matte clear coating film.

On the other hand, the above-mentioned aggregate is not particularly limited, and may be a usual natural material such as fluorite, quartz sand, quartz or the like.
Examples include ground ceramic particles, calcium carbonate particles, mica pieces, resin beads, resin flakes, and the like. In addition, an aggregate obtained by coloring an aggregate with a resin-containing coloring agent or a colored resin can also be used as beads and flakes. Such colorants have good adhesion to aggregates, alkali resistance,
A reaction-curable resin paint having good weather resistance is preferable, and examples thereof include a paint made of an acrylic silicone resin, an acrylic urethane resin, a fluororesin, or the like. The aggregate is based on 100 parts by weight of the solid content of the paint for forming the clear coating.
It is preferable to contain 0.1 to 50 parts by weight. If the amount is less than 0.1 part by weight, the pattern forming effect is insufficient, and if it exceeds 50 parts by weight, the durability of the coating film may be reduced. By including the aggregate, the pattern formability of the entire coating film is improved.

The paint for forming a clear coating film can be obtained by dissolving and dispersing a resin, a surfactant, and if necessary, a matting agent and other additives in a solvent such as an organic solvent or water.

The paint for forming the clear coating film is an undercoat
As with paints and base coats,
Can be performed using a coater, flow coater, spray, etc.
it can. In addition, the clear coating film forming paint contains aggregates.
Improve paint transfer efficiency and allow paint recycling.
As a coating method, the coating liquid pressure at the tip of the coating gun
0kgf / cm^TwoAirless shower coat
Painting can also be used. Clear coating film
The dry coating amount is 10 to 100 g / m each time. ^TwoIs preferred
New More preferably, 10 to 30 g / m each time^Two
It is. After applying the clear coating film forming paint, under specified conditions
By drying, a clear coating film is formed and
A coated plate with a composite coating formed on a substrate can be obtained
You.

The case where the pattern coating film forming method of the present invention is applied to a substrate to be coated having irregularities will be described below.
For example, when coating a substrate to be coated having an uneven surface similar to a wall surface on which bricks are stacked, a brick equivalent portion (convex portion)
In order to paint joints (concave portions), which are seams, the undercoat paint is sprayed over the entire surface of the substrate to be coated by spraying or the like, and then 50 to 150 using a conveyor-type drying furnace or the like.
Dry at 1C for 1-60 minutes. Subsequently, using a roll coater having a transfer roll having a smooth cylindrical surface, the base coat forming paint is applied over the surface of the brick equivalent portion. In the case where unevenness is formed on the surface of a brick-equivalent portion, a letterpress transfer roll described later may be used instead of a transfer roll having a smooth cylindrical surface. Drying of the base coat forming paint is performed in the same manner as in the case of the undercoat paint.

In order to further enhance the design, a transfer pattern is partially formed on the surface of a brick-equivalent portion with a coating composition for forming a pattern coating film having a different hue using a roll coater having a letterpress transfer roll. . After the transfer pattern is formed, drying is performed using a conveyor-type drying furnace or the like. Further, using a coating for forming a clear coating film, the entire surface of the coating film formed above is spray-painted with a spray or the like to form a clear coating film and then dried. In this way, a patterned coating film can be formed on the substrate on which the irregularities have been formed.

Coated plate The coated plate of the present invention is obtained by the above-mentioned method for forming a patterned coating film. The coating composition for forming a pattern coating film formed on an inorganic (ceramic) or metal siding-related wall material, exterior building material, interior building material, metal building material, or the like having a base coat formed thereon by a relief transfer roll as the coating plate. And a composite coating consisting of a clear coating having good weather resistance. Therefore, it is possible to provide a weather-resistant coated plate having a fine transfer pattern with improved contour collapse.

[0058]

Next, the present invention will be described in more detail with reference to examples and comparative examples, but the present invention is not limited to these examples.

Examples 1 to 7 and Comparative Examples 1 to 3 Preparation of Coated Substrate Coated substrate A: thickness: 12 mm, width: 460 mm, length;
900mm ceramic siding system exterior building material panel surface, surface width: 10mm, bottom width: 7mm, depth: 3m
m groove in the width direction (direction perpendicular to the loading direction) 65 mm
Each time, the substrate was carved every 300 mm in the length direction (the same direction as the carry-in direction), and a substrate having fine irregularities on the convex surface other than the groove was used as the substrate to be coated A. Coating base material B: surface width; 10 mm, bottom width;
Depth: 2 mm grooves in width direction every 65 mm, 3 in length direction
The thickness consisting of the front side color steel sheet, the urethane foam layer and the back side steel sheet embossed every 00 mm;
A metal siding-based exterior building material having a width of 400 mm and a length of 900 mm was used as a base material B to be coated.

Preparation of Basecoat Forming Coating Basecoat Forming Coating A: A resin / pigment solid content weight ratio of 15/10, and a surface tension of a dried coating film of 38 dyn / cm by an N-alkylpyrrolidone-based surfactant. The coefficient of floor sliding resistance of the dried coating film is 0.2
Then, the prepared acrylic resin emulsion paint was used as base coat forming paint A. Base coat forming paint B: The solid content weight ratio of the resin to the pigment is 13/10, the surface tension of the dried coating film is 35 dyn / cm by an N-alkylpyrrolidone-based surfactant, and the floor sliding resistance coefficient of the dried coating film is 0.3 by finely divided silica
The thus prepared silicone-modified acrylic resin emulsion paint was used as base coat forming paint B. Base coat forming paint C: Base coat forming paint A
A coating material in which the surface tension of the dried coating film was adjusted to 32 dyn / cm with a polyoxyethylene-added silicone-based surfactant was used as base coat forming coating material C. Base coat forming paint D: Base coat forming paint B
The coating material in which the coefficient of floor sliding resistance was adjusted to 0.4 with calcium carbonate was used as coating material D for forming a base coat.

Preparation of a paint composition for forming a pattern coating A coating composition A for forming a pattern coating: a liquid temperature of 25 ° C., a residual viscosity of 0.5 Pas, a yield value of 15 Pa, and a surface tension of the coating liquid of 32 dyn / cm. (Surface tension of dried coating film: 33 dyn /
cm), an acrylic resin emulsion paint adjusted with a modified polyacrylsulfonate-based viscosity modifier and an N-alkylpyrrolidone-based surfactant was used as a paint composition A for forming a patterned coating film. Coating composition B for forming a patterned coating film: the liquid temperature is 25 ° C., the residual viscosity is 0.5 Pas, the yield value is 15 Pa, and the surface tension of the coating solution is 32 dyn / cm (the surface tension of the dried coating film is 32 dyn /
cm), a silicone-modified acrylic resin emulsion paint prepared with a modified polyacrylsulfonate-based viscosity modifier and an N-alkylpyrrolidone-based surfactant was used as a paint composition B for forming a patterned coating film. Coating composition C for forming a patterned coating: liquid temperature is 25 ° C., residual viscosity is 0.3 Pas, yield value is 8 Pa, and surface tension of coating liquid is 38 dyn / cm (surface tension of dried coating is 34 dyn / c).
An acrylic resin emulsion paint prepared using a polyacrylate-based viscosity modifier and a polyoxyethylene-added silicone-based surfactant so as to satisfy m) was used as a paint composition C for forming a patterned coating film. Coating composition D for forming a patterned coating film: a liquid temperature of 25 ° C., a residual viscosity of 0.7 Pas, a yield value of 5 Pa, and a surface tension of the coating solution of 35 dyn / cm (a surface tension of the dried coating film of 33 dyn / c)
m), a silicone-modified acrylic resin emulsion paint prepared using a polyurethane-modified viscosity modifier and a polyoxyethylene-added silicone-based surfactant was used as a paint composition D for forming a patterned coating film. Coating composition E for forming a patterned coating film (for comparative example): liquid temperature of 25
Modified polyacrylsulfonate-based viscosity modifier such that the surface tension of the coating liquid is 23 dyn / cm (the surface tension of the dried coating film is 30 dyn / cm) at a residual viscosity of 0.05 Pas and a yield value of 4 Pa at 0 ° C. And an acrylic resin emulsion paint prepared with an N-alkylpyrrolidone surfactant was used as a paint composition E for forming a patterned coating film. Coating composition F for forming a patterned coating film (for comparative example): liquid temperature of 25
Modified polyacrylsulfonate-based viscosity modifier such that the surface tension of the coating liquid is 50 dyn / cm (the surface tension of the dried coating film is 42 dyn / cm) at a residual viscosity of 0.6 Pas and a yield value of 32 Pa at 0 ° C. A silicone-modified acrylic resin emulsion paint prepared with a polyoxyethylene-added silicone surfactant and a paint composition F for forming a patterned coating film
And

Preparation of clear coating film forming coating material Clear coating film forming coating material A: adjusted by using a benzotriazole-based ultraviolet absorber so that the dry film thickness is 10 μm and the ultraviolet ray transmittance at a wavelength of 300 to 320 nm is 10%. Then, so that the surface tension of the coating liquid is 31 dyn / cm,
An acrylic resin emulsion paint prepared with an N-alkylpyrrolidone-based surfactant was used as a clear coating film forming paint A. Clear coating film forming coating material B: A coating film liquid is prepared using a benzotriazole-based UV absorber and a hindered amine-based light stabilizer so that the dried film thickness is 10 μm and the UV transmittance at a wavelength of 300 to 320 nm is 10%. Surface tension of 3
A silicone-modified acrylic resin emulsion paint prepared with an N-alkylpyrrolidone-based surfactant so as to be 0 dyn / cm was used as a clear coating film forming paint B. Clear coating film forming paint C: Clear coating film forming paint A
2 parts by weight of two kinds of acrylic resin beads of black and red having an average particle diameter of 20 μm were added as an aggregate to 100 parts by weight of the solid content of the paint, respectively. The ultraviolet transmittance was 8% and the surface tension was 31 dyn /. cm of the coating material was designated as a clear coating film forming coating material C. Clear coating film forming paint D: Clear coating film forming paint A
2 parts of black and yellow colored silica sand having an average particle size of 300 μm as an aggregate were added in an amount of 4 parts by weight based on 100 parts by weight of the solid content of the paint. The ultraviolet transmittance was 6% and the surface tension was 3%.
The coating material of 1 dyn / cm was used as a clear coating film forming coating material D.

Preparation of Undercoat Paint Undercoat A: The same paint as basecoat forming paint A was used. Undercoat B: The same paint as basecoat-forming paint B was used.

Measurement Method Residual viscosity, yield value: Shear stress was measured using a cone plate type rotary viscometer (“E-type viscometer” manufactured by Tokyo Keiki Co., Ltd.), and the shear stress was measured. The residual viscosity and the yield value were measured. Surface tension: (1) Dry coating film: A dry coating film of a base coat forming paint was used as a test piece in JIS K 6786 "Wetting test method for polyethylene and polypropylene films", and the surface tension was measured with a standard solution used in the above test method. did. (2) Coating liquid: The surface tension was measured using a “Dinometer” (manufactured by Big Chemie Japan). Floor slip frictional resistance coefficient: A dry coating film of a base coat forming paint is used as a test piece in JIS A 1407 "Floor slip test method (pendulum type)", and a pattern is applied to the above-mentioned test piece contact portion of the slip piece used in the above test method. The paint for forming a film was applied, and 5 seconds after the application, the coefficient of resistance to floor sliding with the paint for forming a patterned coating film was measured. Ultraviolet transmittance: The transmittance of ultraviolet light having a wavelength of 300 to 320 nm was measured for a clear coating film piece having a dry film thickness of 10 μm using a “Spectrophotometer U-3200” (manufactured by Hitachi, Ltd.).

Formation of Coating Film Each base material to be coated is coated with an undercoating material by spray coating so that the dry coating amount is 70 g / m ² ,
After drying for 0 minutes, the base coat-forming paint was applied to a convex portion other than the groove portion with a roll coater provided with a transfer roll having a smooth roll surface so that the dry coating amount was 40 g / m ² , and the coating was performed at 100 ° C. for 5 minutes. Dried. Furthermore, the diameter of the size of the handle is 5 to 20 mm on the letterpress transfer roll and 0.2 mm
The coating composition for forming a pattern coating film of the present invention was dried with a roll coater equipped with a kiln-modified sponge relief transfer roll in which grooves having a depth of 60 were formed in a mesh at a rate of 60 per inch. 10 to 30 μm (dry coating amount is 20 g / m
² ) The gap between the feed roll and the letterpress transfer roll was coated with a thickness of 10 mm so as to satisfy ² ), and the coating was performed and dried at 100 ° C. for 5 minutes. After that, the dry coating amount of the clear coating film forming paint is 30.
g / m ² and spray coating at 100 ° C.
After drying for a minute, a composite coating was formed. Table 1 shows combinations of paints in each of the examples and comparative examples. The collapse of the contour of the transfer pattern portion and the uniformity of the film thickness of the transfer pattern were evaluated, and the results are shown in Table 1.

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[Table 1]

Evaluation Method and Evaluation Criteria (1) Distorted contour of transfer pattern portion: The difference in dry coating thickness between the central portion and the end portion of the pattern portion was measured and evaluated according to the following five grades.
The smaller the difference in dry film thickness, the better. 5: Difference in dry coating thickness between the center and the end of the pattern less than 10 μm 4 ... Difference in dry coating thickness between the center and the end of the pattern 10 to 19
μm 3: Dry film thickness difference 20-29 between center and edge of pattern
μm 2... Dry film thickness difference between the center and the end of the pattern 30 to 49
μm 1: Difference in dry coating thickness between the central part and the end part of the pattern of 50 μm or more (2) Uniformity of the thickness of the transferred pattern: The distance at which the streaky thick film portion can be distinguished and the length of the thick film portion It was evaluated visually and evaluated according to the following five grades. 5: The streak-like thick film part is inconspicuous and indistinguishable in front of the eyes. 4 ... The streak-like thick film part is not determined when it is 50 cm away. The length of the portion is within 5 mm. 2... Is determined even if the streak-like thick film portion is 1 m away. The length of the thick-film portion is within 10 mm. 1. The length of the part exceeds 10 mm

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As is clear from the results shown in Table 1, according to the present invention, inorganic (ceramic) -based metal siding-related wall materials, exterior building materials, interior building materials, metal building materials, etc. are formed by letterpress transfer rolls. It was confirmed that the deformation of the contour of the transfer pattern portion due to the coating composition for forming a pattern coating film was improved.
By controlling the viscosity and the interfacial properties of the coating composition for forming a patterned coating film to form a transferred patterned coating film, the transfer pattern layer formed by the coating composition for forming a patterned coating film is formed on a substrate to be coated using a relief transfer roll. To provide a method of forming a patterned coating film and a coated plate, which can reduce the deviation of the design and control the uniformization of the film thickness of the design pattern portion.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masahiko Mutsu 4-1-1-15 Minamishinagawa, Shinagawa-ku, Tokyo Inside Japan Paint Co., Ltd.

Claims (7)

[Claims] 1. The coating composition has a residual viscosity of 0.1 to 5 Pas when applied.
(25 ° C.), a coating composition for forming a patterned coating film having a yield value of 5 to 30 Pa (25 ° C.). 2. The coating composition for forming a patterned coating film according to claim 1, wherein the coating composition has a surface tension of 25 to 45 dyn / cm. 3. The method according to claim 1, wherein the base material has a base coat formed thereon.
A method for forming a patterned coating film using a letterpress transfer roll using the coating composition for forming a patterned coating film according to claim 1. 4. The method according to claim 3, further comprising, after forming the pattern coating film, forming a clear coating film forming paint as an overcoating film. 5. The substrate to be coated has irregularities.
Or the method for forming a patterned coating film according to 4. 6. The method according to claim 3, wherein an undercoating film is formed on the substrate. 7. A coated plate coated by the method for forming a patterned coating film according to any one of claims 3 to 6.