JP2013189488A - Coating composition and coating substrate - Google Patents

Coating composition and coating substrate Download PDF

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JP2013189488A
JP2013189488A JP2012054418A JP2012054418A JP2013189488A JP 2013189488 A JP2013189488 A JP 2013189488A JP 2012054418 A JP2012054418 A JP 2012054418A JP 2012054418 A JP2012054418 A JP 2012054418A JP 2013189488 A JP2013189488 A JP 2013189488A
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coating
pigment
coating film
film
coating composition
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JP6055192B2 (en
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Yasuhiro Tsutsumi
靖浩 堤
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KMEW Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide: a coating composition that can form a coating film excellent in design and weatherability by coating of one coat; and a coating substrate.SOLUTION: A coating composition 1 includes a transparent pigment, a light-reflecting pigment, and a resin component. The transparent pigment is used in which a light transmittance is 60-80% when a film thickness of a coating film 2 formed with the coating composition 1 is 10 μm, and the light transmittance is 25-40% when the film thickness of the coating film 2 is 20 μm.

Description

本発明は、塗料組成物及び塗装基材に関するものである。   The present invention relates to a coating composition and a coated substrate.

従来、メタリック塗膜として、特定明度のグレー色、ソリッドカラー色、シルバー色又はカラーメタリック色の下地塗膜上に、光線透過率が特定の範囲に設定された透け色のメタリック塗料を積層したものが知られている（例えば、特許文献１参照）。   Conventionally, as a metallic paint film, a transparent metallic paint with a light transmittance set to a specific range is laminated on a gray, solid color, silver or colored metallic base coat with a specific brightness. Is known (see, for example, Patent Document 1).

そして、このメタリック塗膜によれば、膜厚のバラツキによる色差が生じない、中明度〜高明度で優れた彩度、光輝感、色調を付与することができるというものである。   And according to this metallic coating film, it is possible to give excellent chroma, brightness, and color tone at medium to high brightness without causing a color difference due to variations in film thickness.

特開平１０−２８９２６号公報Japanese Patent Laid-Open No. 10-28926

しかし、上記のような従来の塗膜は２コート以上の塗装で意匠性を高めようとするものである。例えば、特許文献１に記載のメタリック塗膜は、下地塗料、メタリック塗料、クリヤー塗料の３コートの塗装で形成されている。このように、従来の塗膜は１コートの塗装で意匠性のみならず耐候性までも高めようとするものではない。   However, the conventional coating film as described above is intended to enhance the designability by painting two or more coats. For example, the metallic coating described in Patent Document 1 is formed by applying three coats of a base coating, a metallic coating, and a clear coating. Thus, the conventional coating film is not intended to enhance not only the design property but also the weather resistance by coating one coat.

本発明は上記の点に鑑みてなされたものであり、１コートの塗装で意匠性及び耐候性に優れた塗膜を形成することができる塗料組成物及び塗装基材を提供することを目的とするものである。   This invention is made | formed in view of said point, It aims at providing the coating composition and coating base material which can form the coating film excellent in the designability and the weather resistance by one-coat coating. To do.

本発明に係る塗料組成物は、透明顔料、高輝性顔料、樹脂成分を含有する塗料組成物であって、前記透明顔料として、前記塗料組成物で形成された塗膜の膜厚が１０μｍである場合の光透過率が６０〜８０％であり、かつ、前記塗膜の膜厚が２０μｍである場合の光透過率が２５〜４０％であるものが用いられていることを特徴とするものである。   The coating composition according to the present invention is a coating composition containing a transparent pigment, a high-brightness pigment, and a resin component, and the coating film formed from the coating composition as the transparent pigment has a thickness of 10 μm. The light transmittance in the case is 60 to 80%, and the light transmittance when the film thickness of the coating film is 20 μm is 25 to 40%. is there.

前記塗料組成物において、前記塗膜の膜厚が１０μｍである場合の光透過率と、前記塗膜の膜厚が２０μｍである場合の光透過率との差が３０％以上であることが好ましい。   In the coating composition, the difference between the light transmittance when the film thickness of the coating film is 10 μm and the light transmittance when the film thickness of the coating film is 20 μm is preferably 30% or more. .

本発明に係る塗装基材は、前記塗料組成物が基材に塗装されていることを特徴とするものである。   The coated substrate according to the present invention is characterized in that the coating composition is coated on the substrate.

前記塗装基材において、前記基材に凹凸が形成されていることが好ましい。   In the coated substrate, it is preferable that irregularities are formed on the substrate.

本発明によれば、１コートの塗装で意匠性及び耐候性に優れた塗膜を形成することができるものである。   According to this invention, the coating film excellent in the designability and the weather resistance can be formed by coating of 1 coat.

本発明に係る塗装基材の一例を示すものであり、（ａ）は概略断面図、（ｂ）は（ａ）の一部を拡大した概略断面図である。An example of the coating base material which concerns on this invention is shown, (a) is a schematic sectional drawing, (b) is the schematic sectional drawing which expanded a part of (a). 本発明に係る塗装基材の他の一例を示すものであり、（ａ）は概略断面図、（ｂ）は（ａ）の一部を拡大した概略断面図である。The other example of the coating base material which concerns on this invention is shown, (a) is a schematic sectional drawing, (b) is the schematic sectional drawing which expanded a part of (a).

以下、本発明の実施の形態を説明する。   Embodiments of the present invention will be described below.

本発明に係る塗料組成物１は、次のような透明顔料、高輝性顔料、樹脂成分を含有するものである。   The coating composition 1 according to the present invention contains the following transparent pigment, high-brightness pigment, and resin component.

すなわち、透明顔料としては、上記の塗料組成物１で形成された塗膜２の膜厚が１０μｍである場合の光透過率が６０〜８０％であり、かつ、上記の塗膜２の膜厚が２０μｍである場合の光透過率が２５〜４０％であるものを用いる。これにより、塗膜２の明るい部分と暗い部分との明度差（コントラスト）が大きくなり、意匠性を高めることができるものである。なお、光透過率は、波長３６０〜８３０ｎｍ程度の可視光線の透過率を意味する。   That is, as the transparent pigment, the light transmittance is 60 to 80% when the film thickness of the coating film 2 formed with the coating composition 1 is 10 μm, and the film thickness of the coating film 2 is as described above. Is used, the light transmittance is 25 to 40%. Thereby, the brightness difference (contrast) of the bright part and dark part of the coating film 2 becomes large, and the design property can be improved. The light transmittance means the transmittance of visible light having a wavelength of about 360 to 830 nm.

特に塗膜２の膜厚が１０μｍである場合の光透過率と、塗膜２の膜厚が２０μｍである場合の光透過率との差が３０％以上であることが好ましい。これにより、塗膜２の意匠性をさらに高めることができるものである。   In particular, the difference between the light transmittance when the film thickness of the coating film 2 is 10 μm and the light transmittance when the film thickness of the coating film 2 is 20 μm is preferably 30% or more. Thereby, the design property of the coating film 2 can further be improved.

上記の塗膜２の膜厚が１０μｍである場合の光透過率が６０％未満であるとき及び８０％を超えるときはいずれも塗膜２の意匠性を高めることができない。また、上記の塗膜２の膜厚が２０μｍである場合の光透過率が２５％未満であるとき及び４０％を超えるときも同様にいずれも塗膜２の意匠性を高めることができない。   When the light transmittance when the film thickness of the coating film 2 is 10 μm is less than 60% and exceeds 80%, the design of the coating film 2 cannot be improved. In addition, when the film thickness of the coating film 2 is 20 μm, the design properties of the coating film 2 cannot be improved either when the light transmittance is less than 25% or more than 40%.

透明顔料の具体例としては、ブルー、グリーン、イエロー、ブラウン等の有色のものを挙げることができる。   Specific examples of the transparent pigment include colored ones such as blue, green, yellow and brown.

ブルーの透明顔料としては、例えば、金属成分がＣｏ−Ｚｎ−Ｓｉ、Ｃｏ−Ａｌ、Ｃｏ−Ａｌ−Ｃｒ等の組成からなる複合酸化物系顔料を用いることができる。   As the blue transparent pigment, for example, a composite oxide pigment whose metal component is composed of Co—Zn—Si, Co—Al, Co—Al—Cr, or the like can be used.

グリーンの透明顔料としては、例えば、金属成分がＣｏ−Ａｌ−Ｃｒ−Ｚｎ、Ｃｏ−Ｃｒ−Ｚｎ−Ｔｉ、Ｃｏ−Ｎｉ−Ｚｎ−Ｔｉ等の組成からなる複合酸化物系顔料を用いることができる。   As the green transparent pigment, for example, a composite oxide pigment having a metal component composed of Co—Al—Cr—Zn, Co—Cr—Zn—Ti, Co—Ni—Zn—Ti, or the like can be used. .

イエローの透明顔料としては、例えば、金属成分がＦｅ、Ｎｉ−Ｔｉ−Ｓｂ、Ｔｉ−Ｃｒ−Ｓｂ等の組成からなる複合酸化物系顔料を用いることができる。   As the yellow transparent pigment, for example, a complex oxide pigment having a metal component composed of Fe, Ni—Ti—Sb, Ti—Cr—Sb, or the like can be used.

ブラウンの透明顔料としては、例えば、金属成分がＴｉ−Ｆｅ−Ｚｎ、Ｆｅ−Ｚｎ等の組成からなる複合酸化物系顔料を用いることができる。   As the brown transparent pigment, for example, a composite oxide pigment having a metal component composed of Ti—Fe—Zn, Fe—Zn, or the like can be used.

透明顔料の粒度は、０．０１〜０．５μｍであることが好ましい。なお、粒度は、レーザー回折・散乱法によって求めた粒度分布における積算値５０％での平均粒径を意味する。   The particle size of the transparent pigment is preferably 0.01 to 0.5 μm. The particle size means an average particle size at an integrated value of 50% in the particle size distribution obtained by the laser diffraction / scattering method.

また高輝性顔料としては、例えば、マイカ（雲母）粒子の表面を二酸化チタンで被覆して形成されたチタンコートマイカや、金属フレーク（アルミニウム、鉄、ステンレス等）等を用いることができる。   Examples of the highly bright pigment include titanium-coated mica formed by coating the surface of mica (mica) particles with titanium dioxide, metal flakes (aluminum, iron, stainless steel, etc.), and the like.

高輝性顔料の粒度は、２０〜４０μｍであることが好ましい。なお、この粒度も上記と同様の意味である。   The particle size of the high luster pigment is preferably 20 to 40 μm. This particle size also has the same meaning as described above.

また樹脂成分としては、無色透明又は有色透明なものであれば特に限定されるものではないが、例えば、アクリル樹脂、ポリエステル樹脂、アクリルシリコン樹脂、珪素アルコキシド樹脂、フッ素樹脂等を用いることができる。   The resin component is not particularly limited as long as it is colorless and transparent or colored and transparent. For example, an acrylic resin, a polyester resin, an acrylic silicon resin, a silicon alkoxide resin, a fluorine resin, or the like can be used.

そして、本発明に係る塗料組成物１は、上記の樹脂成分に上記の透明顔料及び高輝性顔料を添加して配合することによって調製することができる。このときの透明顔料の添加量は顔料重量濃度（ＰＷＣ：Pigment Weight Concentration）で１０〜２０％であることが好ましく、高輝性顔料の添加量は顔料重量濃度で１〜２０％であることが好ましい。なお、塗料組成物１は適当な溶媒で希釈して塗装に適した粘度に調整してもよい。   And the coating composition 1 which concerns on this invention can be prepared by adding and mix | blending said transparent pigment and high luster pigment with said resin component. At this time, the addition amount of the transparent pigment is preferably 10 to 20% in terms of pigment weight concentration (PWC), and the addition amount of the bright pigment is preferably 1 to 20% in terms of pigment weight concentration. . The coating composition 1 may be diluted with a suitable solvent to adjust the viscosity to be suitable for coating.

また本発明に係る塗装基材４は、上記のようにして得られた塗料組成物１を図１（ａ）のように基材３の表面に塗装し、焼き付けて乾燥させることによって製造することができる。すなわち、この塗装は１コート１ベーク方式で行うことができる。   The coated substrate 4 according to the present invention is manufactured by coating the coating composition 1 obtained as described above on the surface of the substrate 3 as shown in FIG. Can do. That is, this coating can be performed by a 1-coat 1-bake method.

ここで、基材３としては、特に限定されるものではないが、例えば、窯業系基材等を用いることができる。窯業系基材は、例えば、セメント、シリカ、補強繊維等を主成分とするセメント系の水性スラリーを抄造法や注型法等で成形した後に養生硬化させることによって得ることができる。このような窯業系基材を用いて得られた塗装基材４は、例えば外壁材等に利用することができる。   Here, the base material 3 is not particularly limited, and for example, a ceramic base material or the like can be used. The ceramic base material can be obtained, for example, by curing and curing a cement-based aqueous slurry mainly composed of cement, silica, reinforcing fibers and the like by a papermaking method or a casting method. The coated base material 4 obtained by using such a ceramic base material can be used for an outer wall material, for example.

基材３の表面に塗料組成物１で形成された塗膜２の膜厚は、特に限定されるものではないが、例えば１〜２０μｍである。図１（ｂ）に示すように、Ａ方向やＢ方向のように塗膜２を見る角度が異なると、塗膜２中を透過する光線の光学的距離（光路長）が異なり、さらには光線が透明顔料及び高輝性顔料で散乱されることによって、塗膜２の同じ付近でも異なる色に見える。このように、１コートの塗装で意匠性に優れた塗膜２を形成することができるものである。しかも塗膜２の膜厚が厚くなるほど光透過率を低くしているので、１コートの塗装で耐候性にも優れた塗膜２を形成することができるものである。   Although the film thickness of the coating film 2 formed with the coating composition 1 on the surface of the base material 3 is not specifically limited, For example, it is 1-20 micrometers. As shown in FIG. 1 (b), when the viewing angle of the coating film 2 is different as in the A direction or the B direction, the optical distance (optical path length) of the light beam passing through the coating film 2 is different. Is scattered by the transparent pigment and the highly bright pigment, so that different colors appear in the same vicinity of the coating film 2. Thus, the coating film 2 excellent in the design property can be formed by coating one coat. And since the light transmittance is made low, so that the film thickness of the coating film 2 becomes thick, the coating film 2 excellent also in the weather resistance can be formed by one-coat coating.

なお、所望の透明顔料が用いられているか否かの確認は、次のようにして行うことができる。すなわち、基材３として無色透明のガラス板やプラスチックフィルムを用い、この基材３の表面に膜厚が１０μｍ及び２０μｍである塗膜２を形成し、この塗膜２の光透過率を分光光度計を用いて測定することによって上記の確認を行うことができる。   Whether or not a desired transparent pigment is used can be confirmed as follows. That is, a colorless and transparent glass plate or plastic film is used as the base material 3, and a coating film 2 having a film thickness of 10 μm and 20 μm is formed on the surface of the base material 3. Said confirmation can be performed by measuring using a meter.

また、図１に示す基材３は塗装面が平坦なものであるが、図２（ａ）のように表面に凹凸が形成された基材３を用い、この凹凸面を塗装面として上記の塗料組成物１を塗装するようにしてもよい。この場合も、図２（ｂ）に示すように、Ａ方向やＢ方向のように塗膜２を見る角度が異なると、塗膜２中を透過する光線の光学的距離（光路長）が異なり、さらには光線が透明顔料及び高輝性顔料で散乱されることによって、塗膜２の同じ付近でも異なる色に見える。しかもこの場合には、基材３の表面の凹凸自体によって意匠性をさらに高めることができるものである。   Moreover, although the base material 3 shown in FIG. 1 has a flat coating surface, the base material 3 with the unevenness | corrugation formed on the surface like FIG. The coating composition 1 may be applied. Also in this case, as shown in FIG. 2 (b), the optical distance (optical path length) of the light beam passing through the coating film 2 is different when the viewing angle of the coating film 2 is different as in the A direction or the B direction. Furthermore, since the light rays are scattered by the transparent pigment and the highly bright pigment, different colors appear in the same vicinity of the coating film 2. In addition, in this case, the design can be further enhanced by the unevenness of the surface of the substrate 3 itself.

以下、本発明を実施例によって具体的に説明する。   Hereinafter, the present invention will be specifically described by way of examples.

（透明顔料）
微粒子複合酸化物顔料である大日精化工業（株）製「ダイピロキサイドＴＭカラー」（Ｃｏ−Ａｌ（ブルー）、Ｃｏ−Ｎｉ−Ｚｎ−Ｔｉ（グリーン）、Ｎｉ−Ｔｉ−Ｓｂ（イエロー））を用いた。また、水酸化鉄、フタロシアニンブルーを用いた。 (Transparent pigment)
"Daipyroxide TM color" (Co-Al (blue), Co-Ni-Zn-Ti (green), Ni-Ti-Sb (yellow)) manufactured by Dainichi Seika Kogyo Co., Ltd., which is a fine particle composite oxide pigment Was used. Moreover, iron hydroxide and phthalocyanine blue were used.

（高輝性顔料）
粒度の異なる２種のチタンコートマイカ（メルク社製パール顔料「イリオジン」）を用いた。 (High luster pigment)
Two types of titanium coated mica (Merck's pearl pigment “Iriodin”) having different particle sizes were used.

（樹脂成分）
アクリル樹脂を用いた。 (Resin component)
Acrylic resin was used.

（塗料組成物）
上記の樹脂成分に上記の透明顔料及び高輝性顔料を表１に示す添加量で添加して配合することによって、１０種の塗料組成物１を調製した。 (Coating composition)
Ten kinds of coating compositions 1 were prepared by adding and blending the above-mentioned transparent pigment and high-brightness pigment in the above resin components in the addition amounts shown in Table 1.

次に、基材３として、表面が平坦な無色透明のガラス板を用い、この基材３の表面に膜厚が１０μｍ及び２０μｍである塗膜２を形成し、この塗膜２の光透過率を分光光度計を用いて測定した。そして、この測定結果に基づいて１０種の塗料組成物１を表１に示すように実施例１〜７及び比較例１〜３に分けた。   Next, a colorless and transparent glass plate having a flat surface is used as the base material 3, and a coating film 2 having a film thickness of 10 μm and 20 μm is formed on the surface of the base material 3. Was measured using a spectrophotometer. And 10 types of coating compositions 1 were divided into Examples 1-7 and Comparative Examples 1-3 as shown in Table 1 based on the measurement results.

（塗装基材）
基材３として、表面に凹凸が形成された窯業系基材を用い、この基材３の表面に上記の各塗料組成物１を塗装し、焼き付けて乾燥させることによって、実施例１〜７及び比較例１〜３の塗装基材４を製造した。このように、１コート１ベーク方式の塗装で形成された各塗膜２（膜厚１５μｍ）について、次のように意匠性及び耐候性を評価した。 (Coating substrate)
Examples 1 to 7 and Example 1-7 by using the ceramic base material with irregularities formed on the surface as the base material 3, coating each of the coating compositions 1 on the surface of the base material 3, and baking and drying it. The coating base material 4 of Comparative Examples 1-3 was manufactured. Thus, about each coating film 2 (film thickness of 15 micrometers) formed by 1 coat 1 baking system coating, the designability and the weather resistance were evaluated as follows.

（意匠性）
グレースケールを用いて塗膜２の最も明るい部分と最も暗い部分との明度差（コントラスト）を目視観察により判定した。 (Creativity)
The brightness difference (contrast) between the brightest part and the darkest part of the coating film 2 was determined by visual observation using a gray scale.

「◎」：コントラストが最大（明度差３以上）であるもの。   “◎”: The contrast is maximum (lightness difference of 3 or more).

「○」：コントラストが大（明度差２以上３未満）であるもの。   “◯”: The contrast is large (brightness difference of 2 or more and less than 3).

「△」：コントラストが中（明度差１以上２未満）であるもの。   “Δ”: Medium contrast (brightness difference of 1 or more and less than 2).

「×」：コントラストが小（明度差１未満）であるもの。   “X”: The contrast is small (lightness difference is less than 1).

（耐候性）
サンシャインウェザーメーター（スガ試験機（株）製）による促進耐候性試験（２０００時間）の前後の塗膜２の色差（△Ｅ）をコニカミノルタ社製色彩色差計「ＣＲ−３００」を用いて測定した。 (Weatherability)
The color difference (ΔE) of the coating film 2 before and after the accelerated weather resistance test (2000 hours) using a sunshine weather meter (manufactured by Suga Test Instruments Co., Ltd.) was measured using a color difference meter “CR-300” manufactured by Konica Minolta. did.

「○」：△Ｅ＜３であるもの。   “◯”: those where ΔE <3.

「×」：３≦△Ｅ＜６であるもの。   “×”: 3 ≦ ΔE <6.

「××」：６≦△Ｅであるもの。   “XX”: 6 ≦ ΔE.

Figure 2013189488
表１から明らかなように、比較例１〜３については、１コートの塗装では意匠性及び耐候性を高めることができないのに対して、所定の透明顔料を用いた実施例１〜７については、１コートの塗装で意匠性及び耐候性を高めることができることが確認された。
Figure 2013189488
 As is clear from Table 1, for Comparative Examples 1 to 3, the design and weather resistance cannot be improved by coating one coat, whereas Examples 1 to 7 using a predetermined transparent pigment are not used. It was confirmed that the design and weather resistance can be improved by coating one coat.

１ 塗料組成物
２ 塗膜
３ 基材
４ 塗装基材 DESCRIPTION OF SYMBOLS 1 Coating composition 2 Coating film 3 Base material 4 Paint base material

Claims (4)

透明顔料、高輝性顔料、樹脂成分を含有する塗料組成物であって、前記透明顔料として、前記塗料組成物で形成された塗膜の膜厚が１０μｍである場合の光透過率が６０〜８０％であり、かつ、前記塗膜の膜厚が２０μｍである場合の光透過率が２５〜４０％であるものが用いられていることを特徴とする塗料組成物。   A coating composition containing a transparent pigment, a high-brightness pigment, and a resin component, and the light transmittance when the film thickness of the coating film formed of the coating composition as the transparent pigment is 10 μm is 60 to 80 %, And a coating composition having a light transmittance of 25 to 40% when the thickness of the coating film is 20 μm is used. 前記塗膜の膜厚が１０μｍである場合の光透過率と、前記塗膜の膜厚が２０μｍである場合の光透過率との差が３０％以上であることを特徴とする請求項１に記載の塗料組成物。   The difference between the light transmittance when the film thickness of the coating film is 10 μm and the light transmittance when the film thickness of the coating film is 20 μm is 30% or more. The coating composition as described. 請求項１又は２に記載の塗料組成物が基材に塗装されていることを特徴とする塗装基材。   A coated base material, wherein the coating composition according to claim 1 or 2 is coated on the base material. 前記基材に凹凸が形成されていることを特徴とする請求項３に記載の塗装基材。   4. The coated substrate according to claim 3, wherein unevenness is formed on the substrate.
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