JP6717475B1 - Heat shield paint - Google Patents
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- JP6717475B1 JP6717475B1 JP2019075587A JP2019075587A JP6717475B1 JP 6717475 B1 JP6717475 B1 JP 6717475B1 JP 2019075587 A JP2019075587 A JP 2019075587A JP 2019075587 A JP2019075587 A JP 2019075587A JP 6717475 B1 JP6717475 B1 JP 6717475B1
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D201/00—Coating compositions based on unspecified macromolecular compounds
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/41—Organic pigments; Organic dyes
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
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Abstract
【課題】１層の塗膜で、Ｌ＊ａ＊ｂ＊の色空間におけるＬ＊値が７０以下であっても近赤外線領域の高い反射率を有する遮熱塗料を提供する。【解決手段】遮熱塗料を塗装した後の乾燥塗膜の色彩の設定値が、Ｌ＊ａ＊ｂ＊の色空間においてａ＊が０以上であり、かつ、ｂ＊が０以上の場合に使用する前記遮熱塗料であって、Ｌ＊ａ＊ｂ＊の色空間におけるａ＊値が１９以上のクロムチタンイエロー顔料と、前記クロムチタンイエロー顔料とは異なる他の顔料と、を含み、前記クロムチタンイエロー顔料の含有量は全顔料成分に対して５０質量％以上であり、前記他の顔料のうち、複合酸化物顔料及び酸化チタン顔料を除く顔料の含有量は、前記クロムチタンイエロー顔料の含有量の半分以下である、遮熱塗料。【選択図】図１PROBLEM TO BE SOLVED: To provide a heat-shielding coating having a high reflectance in the near-infrared region even if the L* value in the L*a*b* color space is 70 or less in a single-layer coating film. SOLUTION: When the set value of the color of the dry coating film after applying the heat-shielding paint is a* is 0 or more and b* is 0 or more in the color space of L*a*b*. The heat-shielding paint used, comprising a chrome titanium yellow pigment having an a* value of 19 or more in the L*a*b* color space, and another pigment different from the chrome titanium yellow pigment, The content of the chrome titanium yellow pigment is 50% by mass or more with respect to all pigment components, and the content of the pigments other than the complex oxide pigment and the titanium oxide pigment among the other pigments is the same as that of the chrome titanium yellow pigment. A thermal barrier paint that is less than half the content. [Selection diagram] Figure 1
Description
本発明は、遮熱塗料に関する。 The present invention relates to a thermal barrier coating.
近年、省エネルギー化及びヒートアイランド対策の重要性から、太陽光の近赤外線領域の反射性を高めた遮熱塗料に関する技術開発が進められている。 In recent years, due to the importance of energy saving and measures against heat islands, technological development of heat-shielding paints having improved reflectivity in the near infrared region of sunlight has been advanced.
近赤外線の反射は、塗料を塗装した後の乾燥塗膜（以後、単に塗膜と呼ぶ）中の顔料による散乱現象によるもので、例えば、ルチル型二酸化チタン（以後、酸化チタンと呼ぶ）は、可視光線領域から近赤外線領域での吸収が低く、光の散乱性が高い点で白顔料として代表的に使用されている。 The reflection of near infrared rays is due to the scattering phenomenon by the pigment in the dry coating film (hereinafter, simply referred to as a coating film) after the paint is applied. For example, rutile titanium dioxide (hereinafter, referred to as titanium oxide) is It is typically used as a white pigment because of its low absorption in the visible light region to the near infrared region and high light scattering properties.
一方、酸化チタンは、色彩を白くし明度をあげるため、塗膜がＣＩＥ（国際照明委員会）の策定するＬ＊ａ＊ｂ＊の色空間におけるＬ＊値が７０程度以下の中〜低明度の場合、他の顔料に対する酸化チタンの配合比を減らす必要がある。そのため、近赤外線領域の散乱性が低下し、遮熱性が十分ではなくなるという問題点があった。 On the other hand, titanium oxide has a medium to low brightness with an L* value of about 70 or less in the L*a*b* color space defined by the CIE (International Commission on Illumination) in order to whiten the color and increase the brightness. In this case, it is necessary to reduce the compounding ratio of titanium oxide to other pigments. Therefore, there is a problem that the scattering property in the near infrared region is lowered and the heat shielding property is not sufficient.
この問題点を解決する方法として、例えば特許文献１には、赤外線の透過性が高い色顔料を用いた塗料による塗膜を、酸化チタンを用いた塗膜上に施す手法が開示されている。 As a method for solving this problem, for example, Patent Document 1 discloses a method of applying a coating film of a coating material using a color pigment having a high infrared transmittance to a coating film of titanium oxide.
また、特許文献２には、一般の酸化チタンよりも粒径の大きい顔料を用いて得られる塗膜の白さを抑制することで、明度の低い色彩でも酸化チタン濃度を相対的に高くし、結果として１層の塗膜で近赤外線反射性を向上させる技術が開示されている。 Further, in Patent Document 2, by suppressing the whiteness of a coating film obtained by using a pigment having a larger particle size than general titanium oxide, the titanium oxide concentration is relatively increased even in a color with low lightness, As a result, a technique for improving near infrared reflectance with a single-layer coating film is disclosed.
しかしながら、特許文献１に開示されている手法は、塗膜を２層必要とするため工程が増える上にコストも高くなる。また、塗膜の劣化や外傷等により上層が薄くなった場合、下層が透けて見えるようになり、さらに下層が一部でも露出した場合、２層の色彩の差異により外観が悪化する。 However, the method disclosed in Patent Document 1 requires two layers of coating films, which increases the number of steps and also increases the cost. Further, when the upper layer becomes thin due to deterioration of the coating film or external damage, the lower layer becomes transparent, and when even a part of the lower layer is exposed, the appearance is deteriorated due to the difference in color between the two layers.
また、特許文献２に開示されている手法では、粒子径差による酸化チタンの濃度差は大きくはなく、十分な効果が期待できない。
本発明は、上記の点に鑑み提案されたものであり、その目的として、一つの側面では、１層の塗膜で、Ｌ＊ａ＊ｂ＊の色空間におけるＬ＊値が７０以下であっても近赤外線領域の高い反射率を有する遮熱塗料を提供することにある。
Further, in the method disclosed in Patent Document 2, the difference in concentration of titanium oxide due to the difference in particle diameter is not large, and a sufficient effect cannot be expected.
The present invention has been proposed in view of the above points, and an object thereof is, in one aspect, a single-layer coating film having an L* value of 70 or less in the L*a*b* color space. It is still another object of the present invention to provide a heat shield coating having a high reflectance in the near infrared region.
本発明の一態様に係る遮熱塗料は、当該遮熱塗料を塗装した後の乾燥塗膜の色彩の設定値が、Ｌ＊ａ＊ｂ＊の色空間においてａ＊が０以上であり、かつ、ｂ＊が０以上の場合に使用する前記遮熱塗料であって、Ｌ＊ａ＊ｂ＊の色空間におけるａ＊値が１９以上のクロムチタンイエロー顔料と、前記クロムチタンイエロー顔料とは異なる他の顔料と、を含み、前記クロムチタンイエロー顔料の含有量は全顔料成分に対して５０質量％以上であり、前記他の顔料のうち、複合酸化物顔料及び酸化チタン顔料を除く顔料の含有量は、前記クロムチタンイエロー顔料の含有量の半分以下である。 The thermal barrier coating material according to one aspect of the present invention has a color set value of a dry coating film after coating the thermal barrier coating material in which a* is 0 or more in a color space of L*a*b*, and , B* is 0 or more, the thermal barrier coating is different from the chromium titanium yellow pigment and the chromium titanium yellow pigment having an a* value of 19 or more in the L*a*b* color space. Other pigments, the content of the chromium titanium yellow pigment is 50% by mass or more based on all pigment components, and the content of pigments other than the complex oxide pigment and the titanium oxide pigment among the other pigments. The amount is not more than half the content of the chromium titanium yellow pigment.
本発明の実施形態によれば、一つの側面では、１層の塗膜で、Ｌ＊ａ＊ｂ＊の色空間におけるＬ＊値が７０以下であっても近赤外線領域の高い反射率を有する遮熱塗料を提供することができる。 According to an embodiment of the present invention, in one aspect, a single-layer coating film has a high reflectance in the near infrared region even if the L* value in the L*a*b* color space is 70 or less. A heat shield paint can be provided.
以下、本発明の遮熱塗料の実施の形態について説明する。 Hereinafter, embodiments of the heat-shielding coating material of the present invention will be described.
前述のように、酸化チタンは、色彩を白くし明度をあげるため、塗膜がＣＩＥの策定するＬ＊ａ＊ｂ＊の色空間におけるＬ＊値が７０以下の中〜低明度の場合、他の顔料に対する酸化チタンの配合比を減らす必要がある。 As mentioned above, since titanium oxide whitens the color and increases the lightness, when the L* value in the L*a*b* color space defined by CIE is 70 or less for medium to low lightness, It is necessary to reduce the compounding ratio of titanium oxide to the pigment.
本発明者らは、非白色の色を有する顔料（以後、色顔料と称する）において、近赤外線領域での散乱性が酸化チタンと同等レベルの色顔料が存在するのであれば、当該色顔料をベース顔料として使用して、他の顔料で調色することで、Ｌ＊値が７０以下の中〜低明度の場合であっても当該色顔料の配合量を多くすることができるのではないかと考えた。なお、「当該色顔料をベース顔料として使用して、他の顔料で調色する」とは、クロムチタンイエロー顔料のみで構成された塗料による塗膜の色彩を基本として、他の顔料を付加することで、目的とする塗膜の色彩になるように調色することを意味する。一般的な遮熱塗料においては、酸化チタンをなるべく多く使用したいために、酸化チタンをベース顔料として使用して調色を行うが、酸化チタンは無彩色で明度が高いため、低明度の色彩に調色する場合はその量を大きく減じる必要がある。一方、色顔料をベース顔料として使用する場合は、目的とする塗膜の色彩が当該色顔料のみの塗料塗膜より明度が高い場合は、酸化チタンを配合すればよく、反対に明度が低い場合は、当該顔料およびその色の補色を呈する顔料を配合すればいいので、かなり明度の低い場合でも当該顔料の配合量を多くすることができる。 In the pigment having a non-white color (hereinafter, referred to as a color pigment), if the color pigment having a scattering property in the near infrared region at the same level as titanium oxide exists, the color pigment is By using as a base pigment and toning with another pigment, it may be possible to increase the blending amount of the color pigment even when the L* value is 70 or less in the medium to low brightness. Thought. It should be noted that "using the color pigment as a base pigment and adjusting the color with another pigment" means adding another pigment based on the color of the coating film made of the paint composed of only the chromium titanium yellow pigment This means that the color is adjusted to obtain the desired color of the coating film. In general thermal barrier paints, we want to use as much titanium oxide as possible, so we use titanium oxide as a base pigment for toning, but since titanium oxide is achromatic and has high brightness, it has low brightness. When toning, it is necessary to greatly reduce the amount. On the other hand, when using a color pigment as a base pigment, if the color of the coating film of interest has a higher lightness than the paint coating of the color pigment alone, it is sufficient to add titanium oxide, on the contrary, if the lightness is low. Since it suffices to mix the pigment and a pigment exhibiting a complementary color to the color, the compounding amount of the pigment can be increased even when the brightness is considerably low.
近赤外線領域での散乱性が高い色顔料としては、複合酸化物顔料が挙げられる。複合酸化物顔料の中でも、酸化チタンのルチル構造の中に発色成分となる遷移金属をドーピングさせたＴｉ−Ｃｒ−Ｓｂ系の複合酸化物顔料でオレンジ色を呈するクロムチタンイエロー（Ｃ．Ｉ． Ｐｉｇｍｅｎｔ Ｂｒｏｗｎ ２４）と、Ｔｉ−Ｎｉ−Ｓｂ系の複合酸化物顔料でレモンイエロー色を呈するニッケルチタンイエロー（Ｃ．Ｉ． Ｐｉｇｍｅｎｔ Ｙｅｌｌｏｗ ５３）が優れていると言われている（例えば、文献「Ｓｏｌａｒ Ｅｎｅｒｇｙ Ｍａｔｅｒｉａｌｓ ＆ Ｓｏｌａｒ Ｃｅｌｌｓ ８９ （２００５） ｐ３５１–３８９ ｐｕｂｌｉｓｈｅｄ ｂｙ Ｅｌｓｅｖｉｅｒ」参照）。 As a color pigment having a high scattering property in the near infrared region, a complex oxide pigment can be mentioned. Among the composite oxide pigments, a Ti-Cr-Sb-based composite oxide pigment obtained by doping a rutile structure of titanium oxide with a transition metal serving as a color-developing component gives an orange chrome titanium yellow (CI Pigment). Brown 24) and nickel-titanium yellow (CI Pigment Yellow 53), which exhibits a lemon yellow color with a Ti-Ni-Sb-based complex oxide pigment, are said to be excellent (for example, the literature "Solar Energy"). Materials & Solar Cells 89 (2005) p351–389 published by Elsevier").
本発明者らは、上記クロムチタンイエロー及びニッケルチタンイエローの市販品を各々複数種類入手して、各々を単独で顔料として使用した塗膜は、いずれも優れた近赤外線反射性能を有することを確認した。これは、上記顔料の近赤外線領域の光の吸収が少ないことに加え、屈折率が高く光の散乱性が優れているためと考えられる。実際に、上記の複合酸化物中の二酸化チタンのモル比は９０％以上であるため、上記の複合酸化物の屈折率は酸化チタンの屈折率２．７より若干低い値であると推定される。 The present inventors obtained a plurality of commercially available products of the above-mentioned chromium titanium yellow and nickel titanium yellow, and confirmed that the coating films using each of them individually as a pigment have excellent near-infrared reflection performance. did. It is considered that this is because the pigment has low absorption of light in the near infrared region, and also has a high refractive index and excellent light scattering properties. Actually, since the molar ratio of titanium dioxide in the above composite oxide is 90% or more, the refractive index of the above composite oxide is estimated to be slightly lower than the refractive index 2.7 of titanium oxide. ..
また、近赤外線領域での分光反射率に関して、クロムチタンイエローは、ニッケルチタンイエローと比較して、可視光線に近い即ち短波長側の近赤外線領域の反射性が優れていることを確認した。太陽からの近赤外線は、波長が短いほどエネルギーが大きくなる分布を有するため、遮熱顔料のベース顔料としては、ニッケルチタンイエローと比較してクロムチタンイエローが優れた特性を有する。さらに、クロムチタンイエローの明度は、ニッケルチタンイエローと比較して低いため、この点においても、Ｌ＊ａ＊ｂ＊の色空間におけるＬ＊値が７０以下の色彩の遮熱顔料のベース顔料として、クロムチタンイエローは優れていると考えられる。 Regarding the spectral reflectance in the near infrared region, it was confirmed that chrome titanium yellow is superior in reflectance in the near infrared region near visible light, that is, on the short wavelength side, as compared with nickel titanium yellow. Since near infrared rays from the sun have a distribution in which the energy increases as the wavelength decreases, chrome titanium yellow is superior as the base pigment of the heat shield pigment in comparison with nickel titanium yellow. Further, since the brightness of chrome titanium yellow is lower than that of nickel titanium yellow, in this respect also, as a base pigment of a heat shield pigment of a color having an L* value of 70 or less in the L*a*b* color space. , Chromium Titanium Yellow is considered excellent.
本発明者らは更に、クロムチタンイエローをベース顔料として使用して他の顔料と混合して塗料化する場合、クロムチタンイエロー顔料のＬ＊ａ＊ｂ＊の色空間におけるａ＊値と、塗膜の近赤外線の反射性との間に相関性があることを見出した。具体的には、同一の色彩となるように塗料化した場合、ａ＊値が大きい（より赤味を有する）クロムチタンイエロー顔料を配合した塗膜が、近赤外線に対するより高い反射率を有することを見出した。 When the present inventors further use chrome titanium yellow as a base pigment and mix it with other pigments to form a coating, the a* value in the L*a*b* color space of the chrome titanium yellow pigment and the coating It was found that there is a correlation with the near infrared reflectance of the film. Specifically, when it is made into a paint so as to have the same color, a coating film containing a chromium titanium yellow pigment having a large a* value (having a redder color) has a higher reflectance to near infrared rays. Found.
即ち、本実施形態に係る遮熱塗料は、
当該遮熱塗料を塗装した後の乾燥塗膜の色彩の設定値が、Ｌ＊ａ＊ｂ＊の色空間においてａ＊が０以上であり、かつ、ｂ＊が０以上の場合に使用する前記遮熱塗料であって、Ｌ＊ａ＊ｂ＊の色空間におけるａ＊値が１９以上のクロムチタンイエロー顔料と、前記クロムチタンイエロー顔料とは異なる他の顔料と、を含み、前記クロムチタンイエロー顔料の含有量は全顔料成分に対して５０質量％以上であり、前記他の顔料のうち、複合酸化物顔料及び酸化チタン顔料を除く顔料の含有量は、前記クロムチタンイエロー顔料の含有量の半分以下である。
That is, the heat-shielding paint according to the present embodiment,
When the setting value of the color of the dry coating film after applying the heat-shielding paint is a* of 0 or more and b* of 0 or more in the color space of L*a*b* A heat-shielding paint, comprising a chrome titanium yellow pigment having an a* value of 19 or more in the L*a*b* color space and another pigment different from the chrome titanium yellow pigment. The content of the pigment is 50% by mass or more with respect to all the pigment components, and the content of the pigments other than the complex oxide pigment and the titanium oxide pigment is the same as the content of the chromium titanium yellow pigment. Less than half.
また、本実施形態に係る他の遮熱塗料は
当該遮熱塗料を塗装した後の乾燥塗膜の色彩の設定値が、Ｌ＊ａ＊ｂ＊の色空間においてａ＊が０以上であり、かつ、ｂ＊が０未満の場合、並びに、ａ＊が０未満の場合に使用する前記遮熱塗料であって、
Ｌ＊ａ＊ｂ＊の色空間におけるａ＊値が１９以上のクロムチタンイエロー顔料と、
前記クロムチタンイエロー顔料とは異なる他の顔料と、
を含み、
前記クロムチタンイエロー顔料の含有量は全顔料成分に対して３０質量％以上であり、
前記他の顔料のうち、複合酸化物顔料及び酸化チタン顔料を除く顔料の含有量は、前記クロムチタンイエロー顔料の含有量の半分以下である。
Further, in the other thermal barrier paint according to the present embodiment, a* is 0 or more in the color space of L*a*b* when the color setting value of the dry coating film after applying the thermal barrier paint is 0 or more, And the above-mentioned thermal barrier paint used when b* is less than 0 and when a* is less than 0,
A chrome titanium yellow pigment having an a* value of 19 or more in the L*a*b* color space,
With another pigment different from the chrome titanium yellow pigment,
Including,
The content of the chrome titanium yellow pigment is 30% by mass or more based on all pigment components,
Among the other pigments, the content of the pigments other than the composite oxide pigment and the titanium oxide pigment is half or less than the content of the chromium titanium yellow pigment.
なお、本実施形態において、クロムチタンイエロー顔料の色彩は、粉体用アタッチメントからの測定が可能な分光型の測色計ＳＥ６０００（日本電色工業株式会社製）を用い、下記条件で測定した。
測定方式：反射
ＣＩＥ標準光源：Ｄ６５
視野：１０°
とした。
In the present embodiment, the color of the chrome titanium yellow pigment was measured under the following conditions using a spectroscopic colorimeter SE6000 (manufactured by Nippon Denshoku Industries Co., Ltd.) capable of measuring from a powder attachment.
Measurement method: Reflective CIE Standard light source: D65
Field of view: 10°
And
なお、クロムチタンイエロー顔料の発色は、遷移金属Ｃｒのｄ−ｄ遷移に伴う特定の波長の吸収にて生じるものである。クロムチタンイエロー顔料がａ＊値が大きい（即ち、より赤味を有している）ということは、結晶構造等に起因して遷移エネルギーが（より）大きく、吸収波長が（より）エネルギーの大きい短波長側へ移行して、それにより可視光線の中で長波長側の光が（より）散乱されたと考えられる。その結果、可視光線に近い近赤外線の吸収も減り、近赤外線の反射性が向上したと考えられる。 The color development of the chrome titanium yellow pigment is caused by absorption of a specific wavelength associated with the d-d transition of the transition metal Cr. Chromium titanium yellow pigment having a large a* value (that is, having a reddish color) means that the transition energy is (more) large and the absorption wavelength is (more) energy due to the crystal structure and the like. It is considered that the light on the long wavelength side was (more) scattered in the visible light by shifting to the short wavelength side. As a result, it is considered that the absorption of near-infrared rays, which is close to visible light, was reduced, and the near-infrared ray reflectivity was improved.
また、クロムチタンイエローは固溶体であるため、クロム又はアンチモン等が抽出されることはない。また、クロムを含む黄色顔料の多くは、クロムが６価であるのに対して、クロムチタンイエローはクロムが３価であるため、ベース顔料として使用した場合であっても比較的低毒性の顔料となる。 Moreover, since chromium titanium yellow is a solid solution, chromium, antimony, etc. are not extracted. In addition, most of the yellow pigments containing chromium have hexavalent chromium, whereas chromium titanium yellow has trivalent chromium, so even when used as a base pigment, it has relatively low toxicity. Becomes
また、白顔料の酸化チタンは、強い光触媒活性を有するために、酸化チタン粒子表面に表面処理を施すことで、塗膜の劣化を防止している。一方、クロムチタンイエローは、酸化チタンと同じルチル型結晶構造であるにも関わらず、光触媒活性は極端に低い。そのため、表面処理を施さない場合であっても、高耐候性グレードの表面処理を施した酸化チタンと同程度の耐候性を有する。 Further, since the white pigment titanium oxide has a strong photocatalytic activity, the surface of the titanium oxide particles is subjected to a surface treatment to prevent deterioration of the coating film. On the other hand, chrome titanium yellow has extremely low photocatalytic activity, despite having the same rutile crystal structure as titanium oxide. Therefore, even if the surface treatment is not performed, it has weather resistance comparable to that of the surface-treated titanium oxide of the high weather resistance grade.
他の顔料としては、特に制限はないが、得られる塗膜の遮熱性及び耐候性の観点から、例えば下記に挙げる顔料を使用することが好ましい。
白系：酸化チタン
青系：フタロシアニンブルー
緑系：フタロシアニングリーン
赤系：キナクリドンレッド、赤色酸化鉄
紫系；キナクリドンバイオレット
黄系：黄色酸化鉄、ベンズイミダゾロン
などが挙げられる。
Other pigments are not particularly limited, but it is preferable to use the pigments listed below, for example, from the viewpoint of heat shielding properties and weather resistance of the resulting coating film.
White system: Titanium oxide Blue system: Phthalocyanine blue Green system: Phthalocyanine green Red system: Quinacridone red, red iron oxide purple system; Quinacridone violet yellow system: Yellow iron oxide, benzimidazolone and the like.
遮熱塗料は一般的に、顔料を合成樹脂中に分散して使用される。使用される合成樹脂としては特に制限はなく、塗料が使用される用途や要求品質等に応じて適宜選択することができる。一例としては、アクリル樹脂、スチレン樹脂、ウレタン樹脂、シリコーン樹脂、フッ素樹脂、エポキシ樹脂、メラミン樹脂、アルキッド樹脂、塩化ビニル樹脂、酢酸ビニル樹脂、ポリエステル樹脂等が挙げられる。これらの樹脂は、混合して使用してもよいし、樹脂を変性又は共重合したものを使用しても良い。また、水などの分散媒に上記合成樹脂を分散させたエマルション系の樹脂や、有機溶剤などの溶媒中に上記合成樹脂を溶解させた溶剤系の樹脂を使用しても良い。 Thermal barrier paints are generally used by dispersing a pigment in a synthetic resin. The synthetic resin used is not particularly limited and can be appropriately selected depending on the application for which the coating material is used and the required quality. Examples include acrylic resins, styrene resins, urethane resins, silicone resins, fluororesins, epoxy resins, melamine resins, alkyd resins, vinyl chloride resins, vinyl acetate resins, polyester resins and the like. These resins may be used as a mixture, or a resin modified or copolymerized may be used. Further, an emulsion type resin in which the above synthetic resin is dispersed in a dispersion medium such as water, or a solvent type resin in which the above synthetic resin is dissolved in a solvent such as an organic solvent may be used.
また、他の顔料として、複合酸化物顔料及び酸化チタン顔料以外の顔料を使用する場合、その含有量は、クロムチタンイエロー顔料の含有量の半分以下とする。 When a pigment other than the complex oxide pigment and the titanium oxide pigment is used as the other pigment, the content thereof is half or less of the content of the chromium titanium yellow pigment.
合成樹脂の含有量としては、特に制限はないが、質量比率で、合成樹脂：全顔料=１：０．５〜１：１．５の範囲内とすることが好ましい。 The content of the synthetic resin is not particularly limited, but it is preferable that the content of the synthetic resin is within the range of synthetic resin:total pigment=1:0.5 to 1:1.5.
なお、本実施形態に係る遮熱塗料は、必要に応じて顔料及び合成樹脂以外の成分を含んでいてもよく、例えば、各種添加剤、造膜助剤、調整剤、体質顔料、骨材等を含んでいても良い。 The heat-shielding coating material according to the present embodiment may contain components other than pigments and synthetic resins as necessary, and examples thereof include various additives, film-forming aids, regulators, extender pigments, aggregates, and the like. May be included.
（実施例）
以下、実施例を参照することにより本実施形態に係る遮熱塗料についてより詳細に説明するが、本発明はこの点において限定されない。
(Example)
Hereinafter, the thermal barrier coating material according to the present embodiment will be described in more detail with reference to examples, but the present invention is not limited in this respect.
（顔料）
ベース顔料として、実施例で使用したクロムチタンイエロー顔料について、表１に示す。
(Pigment)
Table 1 shows the chrome titanium yellow pigment used in the examples as the base pigment.
上記の各顔料のうち、記号Ｃ２、Ｃ４、Ｃ６、Ｃ７の顔料は水中に分散された分散体である。一方でその他の顔料は粉体であるため、水を分散媒とした顔料分散体を作成した。なお、記号Ｃ３、Ｃ５の顔料については、顔料濃度を３０質量％とし、それ以外の顔料については、顔料濃度を５５質量％とした。
Among the above pigments, the pigments with the symbols C2, C4, C6 and C7 are dispersions dispersed in water. On the other hand, since the other pigments are powders, a pigment dispersion using water as a dispersion medium was prepared. The pigments of the symbols C3 and C5 had a pigment concentration of 30% by mass, and the other pigments had a pigment concentration of 55% by mass.
次に、合成樹脂としてエマルジョン系の樹脂ＰＲＩＭＡＬ ＡＣ−２６１Ｐ（ＤｏｗＣｈｅｍｉｃａｌ社製）を用いて、造膜助剤としてテキサノールを合成樹脂に対して５質量％、プロピレングリコールを３質量％添加し、さらに粘度調整剤としてＰＲＩＭＡＬ ＲＭ−２０２０ＮＰＲ（Ｄｏｗ Ｃｈｅｍｉｃａｌ社製）を１．５質量％添加し、撹拌してクリヤー剤を作成した。 Next, using an emulsion type resin PRIMAL AC-261P (manufactured by Dow Chemical Co.) as a synthetic resin, 5% by mass of texanol and 3% by mass of propylene glycol were added to the synthetic resin as a film forming aid, and the viscosity was further increased. 1.5% by mass of PRIMAL RM-2020NPR (manufactured by Dow Chemical Co.) was added as a regulator and stirred to prepare a clearing agent.
得られたクリヤ―剤に対して、各顔料の分散体を所定の色彩、具体例としてはベージュ色系、グリーン色系、ダークブラウン色系の３種類の色相、となるように混合して調合して、各実施例及び各比較例の塗料を作成した。なお、塗料の組成は、合成樹脂の固形分の質量と全顔料の質量が等しくなるように、また、塗料中の乾燥塗膜成分は５０質量％となるように調整した。 The obtained clearing agent is mixed with a dispersion of each pigment so as to have a predetermined color, for example, three kinds of hues of beige color, green color and dark brown color. Then, the coating material of each Example and each Comparative Example was created. The composition of the paint was adjusted so that the mass of the solid content of the synthetic resin was equal to the mass of all the pigments, and the dry coating film component in the paint was 50 mass %.
（ベージュ色系塗料）
ベージュ色系塗料に関して、使用した顔料と配合量について、表４に示す。
(Beige paint)
Table 4 shows the pigments used and the blending amounts of the beige-based paints.
（グリーン色系塗料）
グリーン色系塗料に関して、使用した顔料と配合量について、表５に示す。
(Green color paint)
Table 5 shows the pigments used and the blending amounts of the green color paints.
（ダークブラウン色系塗料）
ダークブラウン色系塗料に関して、使用した顔料と配合量について、表６に示す。
(Dark brown color paint)
Table 6 shows the pigments used and the blending amounts of the dark brown color paints.
（分光反射率の測定及び評価）
上記作成した各実施例及び各比較例の塗料を、バーコーター（＃５０）を使用して、ＪＩＳ Ｋ５６００−４−１の４．１．２（１９９９）に規定されている白色部及び黒色部を有する隠ぺい率試験紙上に塗布して、自然乾燥させることで試験片を作製した。
(Measurement and evaluation of spectral reflectance)
Using the bar coater (#50), the above-prepared paints of Examples and Comparative Examples were white and black parts specified in 4.1.2 (1999) of JIS K5600-4-1. A test piece was prepared by applying it on a hiding rate test paper having the above and naturally drying it.
得られた試験片の黒色部の分光反射率を、波長３００〜２５００ｎｍの範囲内で分光光度計（ＳｏｌｉｄＳｐｅｃ ３７００：島津製作所株式会社）を用いて測定した。但し、標準白色板は、ふっ素樹脂系標準白色板を用いた。 The spectral reflectance of the black part of the obtained test piece was measured using a spectrophotometer (SolidSpec 3700: Shimadzu Corporation) within a wavelength range of 300 to 2500 nm. However, as the standard white plate, a fluororesin standard white plate was used.
得られた測定結果をＪＩＳ Ｋ５６０２（２００８）に基づき、全波長域（３００〜２５００ｎｍ）、紫外線及び可視光域（３００〜７８０ｎｍ）、近赤外線領域（７８０〜２５００ｎｍ）の３つの波長範囲についての日射反射率を求めた。 Based on JIS K5602 (2008), the obtained measurement results are insolated for three wavelength ranges of the whole wavelength range (300 to 2500 nm), the ultraviolet and visible light range (300 to 780 nm), and the near infrared range (780 to 2500 nm). The reflectance was calculated.
図１に、本実施形態に係るベージュ色系塗料を用いた試験片での、各波長領域における分光反射率をプロットした図を示す。図２に、本実施形態に係るグリーン色系塗料を用いた試験片での、各波長領域における分光反射率をプロットした図を示す。図３に、本実施形態に係るダークブラウン色系塗料を用いた試験片での、各波長領域における分光反射率をプロットした図を示す。 FIG. 1 shows a plot of the spectral reflectance in each wavelength region of a test piece using the beige color paint according to the present embodiment. FIG. 2 shows a plot of the spectral reflectance in each wavelength region of the test piece using the green color paint according to this embodiment. FIG. 3 shows a plot of the spectral reflectance in each wavelength region of the test piece using the dark brown color paint according to the present embodiment.
また、表７に、本実施形態に係るベージュ色系塗料を用いた試験片での射反射率の算出結果を示す。表８に、本実施形態に係るグリーン色系塗料を用いた試験片での射反射率の算出結果を示す。表９に、本実施形態に係るダークブラウン色系塗料を用いた試験片での射反射率の算出結果を示す。 In addition, Table 7 shows the calculation results of the radiation reflectance of the test piece using the beige color paint according to the present embodiment. Table 8 shows the calculation results of the reflectance of the test piece using the green color paint according to the present embodiment. Table 9 shows the calculation results of the reflectance of the test pieces using the dark brown color paint according to the present embodiment.
図１と表７、図２と表８、及び、図３と表９より明らかであるように、ベージュ色系塗料、グリーン色系塗料、ダークブラウン色系塗料のいずれの塗料においても、本実施形態に係る遮熱塗料は、近赤外線領域での日射反射率が優れていることがわかった。
As is clear from FIG. 1 and Table 7, FIG. 2 and Table 8, and FIG. 3 and Table 9, the present embodiment is applied to any of the beige color paint, the green color paint, and the dark brown color paint. It was found that the heat-shielding paint according to the embodiment has an excellent solar reflectance in the near infrared region.
Claims (2)
Ｌ＊ａ＊ｂ＊の色空間におけるａ＊値が１９以上のクロムチタンイエロー顔料と、
酸化チタン顔料と、
前記クロムチタンイエロー顔料及び酸化チタン顔料とは異なる他の顔料と、
を含み、
前記クロムチタンイエロー顔料の含有量は全顔料成分に対して５０質量％以上であり、
前記他の顔料のうち、複合酸化物顔料を除く顔料の含有量は、前記クロムチタンイエロー顔料の含有量の半分以下であり、
前記他の顔料は、フタロシアニンブルー、キナクリドンレッド、赤色酸化鉄、ベンズイミダゾロン及びキナクリドンバイオレットの群から選択される１つ以上の顔料である、
遮熱塗料。 The color setting value of the dry coating after applying the heat-shielding paint is adjusted so that a* is 0 or more and b* is 0 or more in the color space of L*a*b*. The thermal barrier paint used in the case,
A chrome titanium yellow pigment having an a* value of 19 or more in the L*a*b* color space,
Titanium oxide pigment,
With another pigment different from the chrome titanium yellow pigment and the titanium oxide pigment,
Including,
The content of the chrome titanium yellow pigment is 50% by mass or more based on all pigment components,
The other of the pigment, the content of the pigment with the exception of composite oxide pigment state, and are less than half the content of the chrome titanium yellow pigment,
The other pigment is one or more pigments selected from the group of phthalocyanine blue, quinacridone red, red iron oxide, benzimidazolone and quinacridone violet.
Heat shield paint.
Ｌ＊ａ＊ｂ＊の色空間におけるａ＊値が１９以上のクロムチタンイエロー顔料と、
酸化チタン顔料と、
前記クロムチタンイエロー顔料及び酸化チタン顔料とは異なる他の顔料と、
を含み、
前記クロムチタンイエロー顔料の含有量は全顔料成分に対して３０質量％以上であり、
前記他の顔料のうち、複合酸化物顔料を除く顔料の含有量は、前記クロムチタンイエロー顔料の含有量の半分以下であり、
前記他の顔料は、フタロシアニンブルー、キナクリドンレッド、赤色酸化鉄、ベンズイミダゾロン及びキナクリドンバイオレットの群から選択される１つ以上の顔料である、
遮熱塗料。
When the setting value of the color of the dry coating film after applying the heat-shielding paint is a* of 0 or more and b* of less than 0 in the color space of L*a*b*, and a* The above-mentioned heat-shielding paint used when the color is adjusted to be less than 0,
A chrome titanium yellow pigment having an a* value of 19 or more in the L*a*b* color space,
Titanium oxide pigment,
With another pigment different from the chrome titanium yellow pigment and the titanium oxide pigment,
Including,
The content of the chrome titanium yellow pigment is 30% by mass or more based on all pigment components,
The other of the pigment, the content of the pigment with the exception of composite oxide pigment state, and are less than half the content of the chrome titanium yellow pigment,
The other pigment is one or more pigments selected from the group of phthalocyanine blue, quinacridone red, red iron oxide, benzimidazolone and quinacridone violet.
Heat shield paint.
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| JPH02185572A (en) * | 1989-01-12 | 1990-07-19 | Nippon Steel Chem Co Ltd | Solar heat shielding coating composition and structure coated therewith |
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