JP2003066027A - Performance evaluation method of photocatalytic functional film and performance evaluation light source of photocatalytic functional film - Google Patents
Performance evaluation method of photocatalytic functional film and performance evaluation light source of photocatalytic functional filmInfo
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- JP2003066027A JP2003066027A JP2001257513A JP2001257513A JP2003066027A JP 2003066027 A JP2003066027 A JP 2003066027A JP 2001257513 A JP2001257513 A JP 2001257513A JP 2001257513 A JP2001257513 A JP 2001257513A JP 2003066027 A JP2003066027 A JP 2003066027A
- Authority
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- Japan
- Prior art keywords
- functional film
- lamp
- photocatalytic functional
- photocatalytic
- wavelength
- Prior art date
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、紫外線の照射によ
って触媒作用をなす光触媒機能膜の性能評価方法及びこ
の評価方法に適した光触媒機能膜の性能評価用光源に関
するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for evaluating the performance of a photocatalytic functional film that acts as a catalyst by irradiation with ultraviolet rays, and a light source for evaluating the performance of a photocatalytic functional film suitable for this evaluation method.
【０００２】[0002]
【従来の技術】光触媒は、空気の存在下で紫外線を照射
すると、空気中の酸素分子の吸着あるいは脱着を誘起さ
せ、汚れ成分や悪臭成分等の有機化合物の酸化分解を促
進する特性を有する。このような光触媒活性を有する光
触媒を塗料に混合し、建築物の壁材や床材などの建材の
表面に塗装し、光触媒機能膜を形成することによって、
表面に汚れが付着することを防ぐ作用や臭いを分解する
作用を付与することが従来から行われている。2. Description of the Related Art Photocatalysts have the property of irradiating ultraviolet rays in the presence of air to induce adsorption or desorption of oxygen molecules in the air and accelerate the oxidative decomposition of organic compounds such as dirt and malodorous components. By mixing a photocatalyst having such a photocatalytic activity with a coating material and coating it on the surface of a building material such as a building wall material or floor material, by forming a photocatalytic functional film,
It has been conventionally performed to impart an effect of preventing dirt from adhering to the surface and an effect of decomposing odor.
【０００３】そして、このような光触媒を含有する光触
媒機能膜の性能評価方法としては、一般には、まず、そ
の光触媒機能膜に汚れとしての有機物を付着させた後、
その光触媒機能膜に紫外線を照射し、その汚れとしての
有機物がどのように分解されるかを種々の方法で測定す
ることが行われている。As a method for evaluating the performance of a photocatalyst functional film containing such a photocatalyst, generally, an organic substance as a stain is first attached to the photocatalyst functional film, and then,
The photocatalytic functional film is irradiated with ultraviolet rays, and how the organic matter as the stain is decomposed is measured by various methods.
【０００４】例えば、光触媒機能膜にアンモニアやメチ
ルメルカプタン等のガスを付着させた後、その光触媒機
能膜にブラックライトランプの紫外線を照射し、そのガ
スがどのように分解されるかをガスクロマトグラフで測
定する方法や、光触媒機能膜にメチレンブルー等の有色
色素を付着させた後、その光触媒機能膜にブラックライ
トランプの紫外線を照射し、吸光光度計や色差計等によ
って光度又は色差を測定する方法（特開２０００−１６
２１２９号公報等）が提案されている。For example, after a gas such as ammonia or methyl mercaptan is attached to the photocatalyst functional film, the photocatalyst functional film is irradiated with ultraviolet rays of a black light lamp to determine how the gas is decomposed by a gas chromatograph. Method of measuring, or after attaching a colored dye such as methylene blue to the photocatalytic functional film, irradiating the photocatalytic functional film with ultraviolet light of a black light lamp, and measuring the luminous intensity or color difference with an absorptiometer or color difference meter ( JP 2000-16
2129 gazette) is proposed.
【０００５】また、特開２００１−１８３３５９号公報
に開示されている方法では、光触媒を含む光触媒機能膜
上に低級アルコールを有する有機層を形成し、その光触
媒機能膜にブラックライトランプの紫外線を照射した
後、水の接触角により光触媒機能膜の性能を評価する方
法が提案されている。Further, in the method disclosed in Japanese Patent Laid-Open No. 2001-183359, an organic layer having a lower alcohol is formed on a photocatalytic functional film containing a photocatalyst, and the photocatalytic functional film is irradiated with ultraviolet rays of a black light lamp. After that, a method of evaluating the performance of the photocatalytic functional film by the contact angle of water has been proposed.
【０００６】ここで、従来の評価方法における紫外線を
発する光源としては、一般には、ブラックライトランプ
を用いられることが多いが、その他、キセノンランプ、
ナトリウムランプ、水銀灯、殺菌灯等の紫外線ランプか
ら選ばれた１種のランプのみが使用されていた。Here, a black light lamp is generally used as a light source for emitting an ultraviolet ray in the conventional evaluation method, but in addition to this, a xenon lamp,
Only one type of lamp selected from ultraviolet lamps such as sodium lamps, mercury lamps and germicidal lamps was used.
【０００７】ところが、１種のランプのみからなる光源
を用いて、異なる種類の光触媒機能膜の性能を評価した
場合、光触媒機能膜間の相対的な性能の評価結果が、太
陽光を用いて評価した結果と十分な相関性が得られない
傾向にあるという問題があり、その改善が望まれてい
る。However, when the performance of different types of photocatalytic functional films is evaluated using a light source consisting of only one type of lamp, the relative performance evaluation results between the photocatalytic functional films are evaluated using sunlight. There is a problem that a sufficient correlation with the result cannot be obtained, and its improvement is desired.
【０００８】[0008]
【発明が解決しようとする課題】本発明は、上記の点に
鑑みてなされたものであり、異なる種類の光触媒機能膜
の性能を評価した場合、光触媒機能膜間の相対的な性能
の評価結果が、太陽光を用いて評価した結果と十分な相
関性が得ることのできる光触媒機能膜の性能評価方法を
提供すること、また、この評価方法に適する光触媒機能
膜の性能評価用光源を提供することを課題とする。SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and when the performances of different types of photocatalytic functional films are evaluated, the evaluation results of relative performance between the photocatalytic functional films are obtained. Provide a performance evaluation method of a photocatalytic functional film capable of obtaining a sufficient correlation with the result evaluated using sunlight, and a light source for performance evaluation of a photocatalytic functional film suitable for this evaluation method. This is an issue.
【０００９】[0009]
【課題を解決するための手段】本発明者等は、上記目的
を達成するために鋭意研究を重ねた結果、異なる種類の
光触媒機能膜間の相対的な性能を評価する場合におい
て、３１０ｎｍ乃至４００ｎｍの第１の波長領域に最大
の相対強度の波長を有する第１のランプと２２０ｎｍ乃
至３００ｎｍの第２の波長領域に最大の相対強度の波長
を有する第２のランプの２種類のランプを組み合わせて
構成した光源を用いることで、太陽光を用いて評価した
結果と、良好な相関性を有する結果が得られる傾向にあ
ることを見出して、本発明の完成に至ったのもである。Means for Solving the Problems As a result of intensive studies for achieving the above-mentioned object, the present inventors have found that when evaluating relative performance between different types of photocatalytic functional films, the film thickness is 310 nm to 400 nm. Combining two types of lamps, a first lamp having a maximum relative intensity wavelength in a first wavelength region of the above and a second lamp having a maximum relative intensity wavelength in a second wavelength region of 220 nm to 300 nm The inventors of the present invention have completed the present invention by finding that by using the constructed light source, a result having a good correlation with a result evaluated using sunlight tends to be obtained.
【００１０】太陽光の波長特性は、紫外領域にブロード
に広がる波長特性を有しているが、３１０ｎｍ乃至４０
０ｎｍの第１の波長領域に最大の相対強度の波長を有す
る第１のランプと２２０ｎｍ乃至３００ｎｍの第２の波
長領域に最大の相対強度の波長を有する第２のランプの
２種類のランプを組み合わせて構成した光源を用いるこ
とで、１種のランプのみからなる光源に比べ、より広範
な紫外領域の紫外線を発する光源とすることができるの
で、より太陽光に近い紫外領域の波長特性を有する光源
が達成できるものと考えられる。その結果、上記２種の
ランプを組み合わせて構成した光源を用いることで、太
陽光を用いて評価した異なる種類の光触媒機能膜間の相
対的な性能の評価結果と良好な相関性を有する結果が得
られる傾向にあるものと考えられる。The wavelength characteristic of sunlight has a wavelength characteristic that broadly spreads in the ultraviolet region, and is 310 nm to 40 nm.
A combination of two types of lamps, a first lamp having a maximum relative intensity wavelength in a first wavelength region of 0 nm and a second lamp having a maximum relative intensity wavelength in a second wavelength region of 220 nm to 300 nm. By using a light source configured as described above, a light source that emits ultraviolet rays in a wider ultraviolet region can be obtained as compared with a light source that includes only one type of lamp, so a light source that has wavelength characteristics in the ultraviolet region that is closer to sunlight Can be achieved. As a result, by using a light source configured by combining the above two types of lamps, there is a good correlation with the relative performance evaluation results between different types of photocatalytic functional films evaluated using sunlight. It is considered that there is a tendency to be obtained.
【００１１】本発明の請求項１に係る発明の光触媒機能
膜の評価方法は、基材上に形成した、紫外線の照射によ
って光触媒作用をなす光触媒機能膜の表面に、紫外線を
発する光源からの紫外線を照射して、光触媒機能膜の性
能を評価する光触媒機能膜の性能評価方法において、前
記紫外線を発する光源が、３１０ｎｍ乃至４００ｎｍの
第１の波長領域に最大の相対強度の波長を有する第１の
ランプと２２０ｎｍ乃至３００ｎｍの第２の波長領域に
最大の相対強度の波長を有する第２のランプを組み合わ
せて構成した光源であることを特徴としている。The method for evaluating a photocatalytic functional film according to claim 1 of the present invention is a method for evaluating a photocatalytic functional film formed on a substrate, which has a photocatalytic function upon irradiation with ultraviolet light, and which has an ultraviolet ray from a light source which emits an ultraviolet ray. In the method for evaluating the performance of a photocatalytic functional film, the light source that emits ultraviolet rays has a maximum relative intensity wavelength in a first wavelength region of 310 nm to 400 nm. The light source is characterized by being configured by combining a lamp and a second lamp having a wavelength of maximum relative intensity in a second wavelength region of 220 nm to 300 nm.
【００１２】本発明の請求項２に係る発明の光触媒機能
膜の評価方法は、請求項１記載の光触媒機能膜の評価方
法において、上記第１のランプがブラックライトランプ
であり、上記第２のランプが殺菌灯であることを特徴と
している。A method for evaluating a photocatalytic functional film according to a second aspect of the present invention is the method for evaluating a photocatalytic functional film according to the first aspect, wherein the first lamp is a black light lamp and the second lamp is the second lamp. The feature is that the lamp is a germicidal lamp.
【００１３】本発明の請求項３に係る発明の光触媒機能
膜の評価方法は、請求項２記載の光触媒機能膜の評価方
法において、上記光触媒機能膜がシリコン樹脂を含む塗
料で形成された被膜であり、上記基体が無機質基体であ
ることを特徴としている。A method for evaluating a photocatalytic functional film according to a third aspect of the present invention is the method for evaluating a photocatalytic functional film according to the second aspect, wherein the photocatalytic functional film is a film formed of a paint containing a silicone resin. It is characterized in that the substrate is an inorganic substrate.
【００１４】本発明の請求項４に係る発明の光触媒機能
膜の評価方法は、請求項３記載の光触媒機能膜の評価方
法において、上記光触媒機能膜が上記基材上に有機質プ
ライマー層を介して形成されたことを特徴としている。A method for evaluating a photocatalytic functional film according to a fourth aspect of the present invention is the method for evaluating a photocatalytic functional film according to the third aspect, wherein the photocatalytic functional film is formed on the substrate through an organic primer layer. It is characterized by being formed.
【００１５】本発明の請求項５に係る発明の光触媒機能
膜の評価方法は、請求項１乃至請求項４のいずれかに記
載の光触媒機能膜の評価方法において、上記第１のラン
プ及び上記第２のランプの紫外線を同時に照射すること
を特徴としている。According to a fifth aspect of the present invention, there is provided a method for evaluating a photocatalytic functional film according to any one of the first to fourth aspects, wherein the first lamp and the first lamp are the same. The feature is that the ultraviolet rays of the two lamps are simultaneously irradiated.
【００１６】本発明の請求項６に係る発明の光触媒機能
膜の評価方法は、請求項５に記載の光触媒機能膜の評価
方法において、上記第１のランプ及び上記第２のランプ
を同時に照射する場合に、上記第１の波長領域及び上記
第２の波長領域で計測される照度比が１０：８乃至１
０：５であることを特徴としている。A photocatalyst functional film evaluation method according to a sixth aspect of the present invention is the photocatalyst functional film evaluation method according to the fifth aspect, wherein the first lamp and the second lamp are simultaneously irradiated. In this case, the illuminance ratio measured in the first wavelength region and the second wavelength region is 10: 8 to 1
It is characterized by being 0: 5.
【００１７】本発明の請求項７に係る発明の光触媒機能
膜の評価方法は、請求項１乃至請求項６のいずれかに記
載の光触媒機能膜の評価方法において、上記光触媒機能
膜に含有する光触媒が酸化チタンであることを特徴とし
ている。The photocatalyst functional film evaluation method according to claim 7 of the present invention is the photocatalyst functional film evaluation method according to any one of claims 1 to 6, wherein the photocatalyst functional film contains the photocatalyst. Is titanium oxide.
【００１８】本発明の請求項８に係る発明の光触媒機能
膜の性能評価用光源は、３１０ｎｍ乃至４００ｎｍの第
１の波長領域に最大の相対強度の波長を有する第１のラ
ンプと２２０ｎｍ乃至３００ｎｍの第２の波長領域に最
大の相対強度の波長を有する第２ランプを組み合わせて
構成したことを特徴としている。The light source for performance evaluation of the photocatalytic functional film of the invention according to claim 8 of the present invention is a first lamp having a wavelength of maximum relative intensity in a first wavelength region of 310 nm to 400 nm and 220 nm to 300 nm. It is characterized in that it is configured by combining a second lamp having a wavelength of maximum relative intensity in the second wavelength region.
【００１９】[0019]
【発明の実施の形態】以下、本発明の実施形態を説明す
る。BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below.
【００２０】本発明は、３１０ｎｍ乃至４００ｎｍの第
１の波長領域に最大の相対強度の波長を有する第１のラ
ンプと２２０ｎｍ乃至３００ｎｍの第２の波長領域に最
大の相対強度の波長を有する第２のランプを組み合わせ
て構成した光源を用いて、光触媒機能膜の性能を評価す
るものである。The present invention provides a first lamp having a maximum relative intensity wavelength in a first wavelength region of 310 nm to 400 nm and a second lamp having a maximum relative intensity wavelength in a second wavelength region of 220 nm to 300 nm. The performance of the photocatalytic functional film is evaluated using a light source configured by combining the above lamps.
【００２１】３１０ｎｍ乃至４００ｎｍの第１の波長領
域に最大の相対強度の波長を有する第１のランプとして
は、特に限定するわけではないが、ブラックライトラン
プ、キセノンランプ、ナトリウムランプ等が使用でき
る。これらのうち、ブラックライトランプは、安価であ
り、点灯時の発熱量が小さいため、評価するサンプルに
熱的な影響を与え難いので好ましい。また、２２０ｎｍ
乃至３００ｎｍの第２の波長領域に最大の相対強度の波
長を有する第２のランプとしては、特に限定するわけで
はないが、殺菌灯、水銀灯等が使用できる。これらのう
ち、殺菌灯は、安価であり、点灯時の発熱量が小さいた
め、評価するサンプルに熱的な影響を与え難いので好ま
しい。The first lamp having a wavelength of maximum relative intensity in the first wavelength region of 310 nm to 400 nm is not particularly limited, but a black light lamp, a xenon lamp, a sodium lamp or the like can be used. Of these, black light lamps are preferable because they are inexpensive and generate a small amount of heat when turned on, and are unlikely to exert a thermal influence on the sample to be evaluated. 220 nm
The second lamp having the maximum relative intensity wavelength in the second wavelength region of 300 nm to 300 nm is not particularly limited, but a germicidal lamp, a mercury lamp, or the like can be used. Of these, germicidal lamps are preferable because they are inexpensive and generate a small amount of heat when turned on, and are unlikely to affect the sample to be evaluated thermally.
【００２２】上記第１のランプと上記第２のランプの点
灯方法としては、
（１）第１のランプのみを点灯させた後第２のランプの
みを点灯させる方法
（２）第１のランプと第２のランプを交互に点灯させる
方法
（３）第１のランプと第２ランプを同時に点灯させる方
法等を用いることができるが、同時に点灯させる方法
が、評価する時間が短くて済み、太陽光の条件に近いの
で好ましい。The method of lighting the first lamp and the second lamp includes (1) a method of lighting only the first lamp and then a second lamp (2) a first lamp A method of alternately lighting the second lamp (3) A method of simultaneously lighting the first lamp and the second lamp can be used, but the method of simultaneously lighting requires a short evaluation time, It is preferable because it is close to the condition of.
【００２３】上記第１のランプと上記第２のランプを同
時に点灯させる場合に、上記第１の波長領域及び第２の
波長領域で計測される照度比が、１０：５乃至１０：７
となるように調製して用いるのが、太陽光の条件に近い
ので好ましい。ここで、照度比は、それぞれ、３１０ｎ
ｍ〜４００ｎｍの第１の波長領域を測定波長域とする検
知器１、及び２２０ｎｍ〜３００ｎｍの第２の波長領域
を測定波長域とする検知器２を有する照度計で計測され
る照度の比である。When the first lamp and the second lamp are simultaneously turned on, the illuminance ratio measured in the first wavelength region and the second wavelength region is 10: 5 to 10: 7.
It is preferable to prepare and use so as to be close to the conditions of sunlight. Here, the illuminance ratio is 310 n, respectively.
The ratio of illuminance measured by an illuminometer having a detector 1 having a first wavelength range of m to 400 nm as a measurement wavelength range and a detector 2 having a second wavelength range of 220 nm to 300 nm as a measurement wavelength range. is there.
【００２４】また、上記第１のランプ及び上記第２のラ
ンプから照射される光の照度は、光触媒機能膜の光触媒
活性が測定できる照度であれば用いることができるが、
照度が弱過ぎると評価に時間がかかる傾向にあり、強過
ぎると測定精度が悪くなる傾向にある。特に限定するわ
けではないが、１乃至８ｍＷ／ｃｍ2であるのが、太陽
光の条件により近いので、好ましい。The illuminance of the light emitted from the first lamp and the second lamp may be any illuminance that can measure the photocatalytic activity of the photocatalytic functional film.
If the illuminance is too weak, the evaluation tends to take time, and if it is too strong, the measurement accuracy tends to deteriorate. Although not particularly limited, 1 to 8 mW / cm 2 is preferable because it is closer to the conditions of sunlight.
【００２５】光触媒機能膜の光触媒活性を測定する方法
としては、特に限定するわけではないが、比較的簡便の
方法として、形成した光触媒機能膜中に含まれる可塑剤
や界面活性剤等の残留有機物が、光触媒機能膜に紫外線
を照射することで分解される度合いを光触媒機能膜の親
水性、すなわち、水の接触角の変化で測定する方法を用
いることができる。具体的には、光触媒機能膜に紫外線
を照射して、光触媒機能膜上面の水の接触角が１０°以
下になるまでの時間を測定する。この時間は短い程、親
水性になる時間が早いこと、すなわち、残留有機物の光
触媒による分解速度が早く、光触媒の活性が高いことを
示している。また、分解速度は、この時間の逆数に比例
することとなる。The method of measuring the photocatalytic activity of the photocatalytic functional film is not particularly limited, but as a relatively simple method, residual organic substances such as plasticizers and surfactants contained in the formed photocatalytic functional film are used. However, it is possible to use a method of measuring the degree of decomposition of the photocatalytic functional film by irradiating it with ultraviolet rays, by measuring the hydrophilicity of the photocatalytic functional film, that is, the change in the contact angle of water. Specifically, the photocatalytic functional film is irradiated with ultraviolet rays, and the time until the contact angle of water on the upper surface of the photocatalytic functional film becomes 10 ° or less is measured. The shorter this time, the faster the time to become hydrophilic, that is, the faster the rate of decomposition of residual organic matter by the photocatalyst, and the higher the activity of the photocatalyst. The decomposition rate will be proportional to the reciprocal of this time.
【００２６】その他、例えば、アンモニアやメチルメル
カプタン等のガスを付着させ、そのガスがどのように分
解されるかをガスクロマトグラフで測定する方法、光触
媒機能膜にメチレンブルー等の有色色素を付着させた
後、吸光光度計や色差計等によって光度又は色差を測定
する方法又は光触媒機能膜上に低級アルコールを有する
有機層を形成し、水の接触角により評価する方法等、従
来使用されている、一般的な方法を用いることもでき
る。In addition, for example, a method of attaching a gas such as ammonia or methyl mercaptan and measuring how the gas is decomposed by a gas chromatograph, after attaching a colored dye such as methylene blue to the photocatalytic functional film , A method of measuring the light intensity or color difference by an absorptiometer or a color difference meter or a method of forming an organic layer having a lower alcohol on the photocatalytic functional film and evaluating the contact angle of water, etc. Any method can be used.
【００２７】光触媒機能膜としては、紫外線の照射によ
って光触媒機能を発現する光触媒を含有する膜であれ
ば、適応することができる。光触媒としては、特に限定
するわけではないが、酸化チタン、酸化亜鉛、酸化ス
ズ、酸化ジルコニウム、硫化亜鉛、ルテニウム錯体等が
用いられる。これらのうち、酸化チタンは、安価で無害
であるので、好ましい。As the photocatalyst functional film, any film containing a photocatalyst which exhibits a photocatalytic function by irradiation of ultraviolet rays can be applied. The photocatalyst is not particularly limited, but titanium oxide, zinc oxide, tin oxide, zirconium oxide, zinc sulfide, ruthenium complex and the like are used. Of these, titanium oxide is preferable because it is inexpensive and harmless.
【００２８】光触媒を含有させる膜としては、無機系被
膜又は有機系被膜を用いることができる。無機系被膜と
しては、例えばシリコン樹脂を含有する塗料の被膜等
が、また、有機系被膜としては、例えば、アクリル樹
脂、ポリエステル樹脂、エポキシ樹脂、ウレタン樹脂、
フェノール樹脂、メラミン系樹脂を含有する塗料の被膜
等が挙げられるが、無機系被膜を用いる方が、光触媒を
含んだ場合の耐候性がより優れる傾向にあるので、好ま
しい。また、光触媒機能膜は、光触媒を含有させる被膜
の下面に、膜厚を厚くするための光触媒を含有させない
被膜を設けた構造の被膜を用いても良い。膜厚を厚くす
る方が、着色性や防食性が向上する傾向にあるので、好
ましい。As the film containing the photocatalyst, an inorganic coating or an organic coating can be used. The inorganic coating is, for example, a coating of a paint containing a silicone resin, and the organic coating is, for example, an acrylic resin, a polyester resin, an epoxy resin, a urethane resin,
Examples thereof include coating films of paints containing a phenol resin and a melamine resin, but it is preferable to use an inorganic coating because the weather resistance when a photocatalyst is included tends to be more excellent. As the photocatalyst functional film, a film having a structure in which a photocatalyst-free film for increasing the film thickness is provided on the lower surface of the photocatalyst-containing film may be used. A thicker film tends to improve the coloring property and anticorrosion property, and is therefore preferable.
【００２９】光触媒機能膜を形成する基材としては、無
機質基材又は有機質基材等の各種基材を用いることがで
る。無機質基材としては、例えば、ガラス基材、金属基
材、ホーロー基材、無機質硬化体の無機質建材、セラミ
ック等が挙げられる。有機質基材としては、プラスチッ
ク基材、木材、紙等が挙げられる。As the base material for forming the photocatalytic functional film, various base materials such as an inorganic base material or an organic base material can be used. Examples of the inorganic base material include a glass base material, a metal base material, an enamel base material, an inorganic hardened inorganic building material, and ceramics. Examples of the organic base material include plastic base materials, wood, paper and the like.
【００３０】また、上記基材に、光触媒機能膜を形成す
る場合には、基材と光触媒機能膜との中間に、密着強度
を上げるための有機質プライマー層を介在させても良
い。有機質プライマー層としては、例えば、エポキシ樹
脂、アクリル樹脂、ウレタン樹脂等のプライマー層が挙
げられる。When a photocatalyst functional film is formed on the base material, an organic primer layer for increasing the adhesion strength may be interposed between the base material and the photocatalyst functional film. Examples of the organic primer layer include primer layers of epoxy resin, acrylic resin, urethane resin, and the like.
【００３１】基材が有機質基材の場合又は、有機質プラ
イマー層を有する場合は、ランプ点灯時の発熱が大きい
と、その熱で有機質基材又は有機質プライマー層がダメ
ージを受ける可能性が生じる。従って、このような場合
は、第１のランプとしては、発熱量の少ないブラックラ
イトランプを、また、第２のランプとしては、発熱量の
少ない殺菌灯を用いるのが好ましい。When the substrate is an organic substrate or has an organic primer layer, if the heat generated when the lamp is turned on is large, the heat may damage the organic substrate or the organic primer layer. Therefore, in such a case, it is preferable to use a black light lamp having a small amount of heat generation as the first lamp and a germicidal lamp having a small amount of heat generation as the second lamp.
【００３２】次に、本発明に係る光触媒機能膜の性能評
価用光源について説明する。Next, the light source for evaluating the performance of the photocatalytic functional film according to the present invention will be described.
【００３３】本発明に係る光触媒機能膜の性能評価用光
源は、３１０ｎｍ乃至４００ｎｍの第１の波長領域に最
大の相対強度の波長を有する第１のランプと２２０ｎｍ
乃至３００ｎｍの第２の波長領域に最大の相対強度の波
長を有する第２のランプを組み合わせて構成した光源で
ある。The light source for evaluating the performance of the photocatalytic functional film according to the present invention comprises a first lamp having a wavelength of maximum relative intensity in a first wavelength region of 310 nm to 400 nm and 220 nm.
It is a light source configured by combining a second lamp having a wavelength of maximum relative intensity in the second wavelength region of 300 nm to 300 nm.
【００３４】太陽光の波長特性は、紫外領域にブロード
に広がる波長特性を有しているが、前記第１のランプと
前記第２のランプの２種類のランプを組み合わせて構成
した光源は、ただ、１種のランプのみからなる光源に比
べ、より広範な紫外領域の紫外線を発する光源とするこ
とができるので、より太陽光に近い紫外領域の波長特性
を有する光源が達成できるものと考えられる。その結
果、前記２種のランプを組み合わせて構成した光源を用
いることで、太陽光を用いて評価した異なる種類の光触
媒機能膜間の相対的な性能評価の結果と良好な相関性を
有する結果が得られるものと考えられる。The wavelength characteristic of sunlight has a wavelength characteristic that broadly spreads in the ultraviolet region, but a light source constructed by combining two types of lamps, the first lamp and the second lamp, is only It is considered that a light source that emits ultraviolet rays in a wider ultraviolet range can be achieved as compared with a light source including only one type of lamp, so that a light source having a wavelength characteristic in an ultraviolet range closer to sunlight can be achieved. As a result, by using a light source configured by combining the two types of lamps described above, there is a good correlation with the result of relative performance evaluation between different types of photocatalytic functional films evaluated using sunlight. It is thought to be obtained.
【００３５】[0035]
【実施例】次に、本発明を実施例によって具体的に説明
する。EXAMPLES Next, the present invention will be specifically described with reference to examples.
【００３６】（実施例１）縦５ｃｍ×横５ｃｍ×厚さ２
ｍｍのアルカリガラスを洗浄・乾燥し、この表面に酸化
チタン含有したシリコン樹脂を含む塗料である松下電工
（株）製「フレッセラ水性Ｐ」（「フレッセラ」は登録
商標、以下同じ）をバーコーターにて塗布し、これを室
温で３日間乾燥させて、膜厚が０．１μｍの光触媒機能
膜を設けたサンプル１を作製した。Example 1 Length 5 cm x Width 5 cm x Thickness 2
mm frass glass was washed and dried, and the surface of this surface was a paint containing a silicon resin containing titanium oxide, "Fresselera aqueous P"("Fresselera" is a registered trademark, the same applies below) manufactured by Matsushita Electric Works, Ltd. was used as a bar coater. Was applied and dried at room temperature for 3 days to prepare Sample 1 provided with a photocatalytic functional film having a film thickness of 0.1 μm.
【００３７】次に、縦５ｃｍ×横５ｃｍ×厚さ２ｍｍの
アルカリガラスを洗浄・乾燥し、この表面に酸化チタン
含有したシリコン樹脂を含む塗料である松下電工（株）
製「フレッセラＰＳ１０００」をバーコーターにて塗布
し、これを室温で３日間乾燥させて、膜厚が０．１μｍ
の光触媒機能膜を設けたサンプル２を作製した。Next, an alkali glass measuring 5 cm in length × 5 cm in width × 2 mm in thickness was washed and dried, and a paint containing a silicon resin containing titanium oxide was applied to the surface of the glass. Matsushita Electric Works Co., Ltd.
"Fressela PS1000" manufactured by Bar Coater was applied and dried at room temperature for 3 days to give a film thickness of 0.1 μm.
A sample 2 provided with the photocatalytic functional film of was prepared.
【００３８】作製した１組のサンプル１とサンプル２の
光触媒機能膜に、ブラックライトランプ［松下電器産業
（株）製「ＦＬ１０ＢＬ−Ｂ」（最大の相対強度の波長
３５２ｎｍ／カタログ値）］と殺菌灯［松下電器産業
（株）製「ＧＬ−１０」（最大の相対強度の波長２５
３．７ｎｍ／カタログ値）］を兼ね備えた光源から、第
１の波長領域の照度：第２の波長領域の照度が５ｍＷ／
ｃｍ2：３．５ｍＷ／ｃｍ2（照度比が１０：７）となる
よう調製した紫外線を照射して、各サンプルの光触媒機
能膜中の残留有機物が分解される分解速度の度合いを、
光触媒機能膜上面の水の接触角が１０°以下になるまで
の時間を測定することで求めた。A pair of the prepared photocatalytic functional film of Sample 1 and Sample 2 was sterilized with a black light lamp [Matsushita Electric Industrial Co., Ltd. "FL10BL-B" (wavelength of maximum relative intensity 352 nm / catalog value)]. Light ["GL-10" manufactured by Matsushita Electric Industrial Co., Ltd. (wavelength of maximum relative intensity 25
3.7 nm / catalog value)], the illuminance in the first wavelength region: the illuminance in the second wavelength region is 5 mW /
cm 2 : 3.5 mW / cm 2 (irradiation ratio 10: 7) was irradiated with ultraviolet rays, and the degree of decomposition rate of the residual organic matter in the photocatalytic functional film of each sample was decomposed,
It was determined by measuring the time until the contact angle of water on the upper surface of the photocatalytic functional film became 10 ° or less.
【００３９】また、作製した別の１組のサンプル１とサ
ンプル２を用いて、屋外で南面垂直暴露を行い、各サン
プルの光触媒機能膜に太陽光を照射して、各サンプルの
光触媒機能膜中の残留有機物が分解される分解速度の度
合いを、光触媒機能膜上面の水の接触角が１０°以下に
なるまでの時間を測定することで求めた。Further, using another set of Sample 1 and Sample 2 prepared, outdoor vertical exposure was carried out on the south surface, and the photocatalyst functional film of each sample was irradiated with sunlight so that the inside of the photocatalyst functional film of each sample was exposed. The degree of decomposition rate of the residual organic substances was determined by measuring the time until the contact angle of water on the upper surface of the photocatalytic functional film was 10 ° or less.
【００４０】（実施例２）縦５ｃｍ×横５ｃｍ×厚さ２
ｍｍのスレート板を洗浄・乾燥し、この表面にエポキシ
樹脂系の有機質プライマー塗料である松下電工（株）製
「フレッセラ水性タイププライマー」をバーコーターに
て塗布し、これを室温で２４時間乾燥させて、膜厚が１
０μｍの有機質プライマー層を形成した。次に、この表
面にシリコン樹脂を含む塗料である松下電工（株）製
「フレッセラ水性タイプ」をバーコーターにて塗布し、
室温で２４時間乾燥させて、膜厚が１０μｍの光触媒を
含有しない被膜を形成した後、酸化チタン含有のシリコ
ン樹脂を含む塗料である松下電工（株）製「フレッセラ
水性Ｐ」をバーコーターにて塗布し、これを室温で３日
間乾燥させて、膜厚が０．１μｍの光触媒を含有した被
膜を設けて光触媒機能膜としたサンプル３を作製した。(Embodiment 2) Length 5 cm × width 5 cm × thickness 2
mm slate plate is washed and dried, and an epoxy resin-based organic primer paint "Fresselera water-based primer" manufactured by Matsushita Electric Works, Ltd. is applied on the surface with a bar coater and dried at room temperature for 24 hours. And the film thickness is 1
A 0 μm organic primer layer was formed. Next, "Fresselera water-based type" manufactured by Matsushita Electric Works, Ltd., which is a coating containing silicon resin, is applied to this surface with a bar coater,
After drying at room temperature for 24 hours to form a film having a thickness of 10 μm and containing no photocatalyst, “Fresselera Aqueous P” manufactured by Matsushita Electric Works, Ltd., which is a paint containing a silicon resin containing titanium oxide, was applied with a bar coater. Sample 3 was prepared by coating and drying it at room temperature for 3 days to form a photocatalyst functional film by providing a film containing a photocatalyst having a film thickness of 0.1 μm.
【００４１】次に、縦５ｃｍ×横５ｃｍ×厚さ２ｍｍの
スレート板を洗浄・乾燥し、この表面にエポキシ樹脂系
の有機質プライマー塗料である松下電工（株）製「フレ
ッセラプライマー」をバーコーターにて塗布し、これを
室温で２４時間乾燥させて、膜厚が１０μｍの有機質プ
ライマー層を形成した。次に、この表面にシリコンを含
む塗料である松下電工（株）製「フレッセラＮＡ３０
０」をバーコーターにて塗布し、さらに室温で２４時間
乾燥させて、膜厚が１０μｍの光触媒を含有しない被膜
を形成した後、酸化チタン含有したシリコン樹脂を含む
塗料である松下電工（株）製「フラッセラＰＳ１００
０」をバーコーターにて塗布し、これを室温で３日間乾
燥させて、膜厚が０．１μｍの光触媒を含有した被膜を
設けて光触媒機能膜としたサンプル３を作製した。Next, a slate plate measuring 5 cm in length × 5 cm in width × 2 mm in thickness was washed and dried, and an epoxy resin-based organic primer paint “Fressela Primer” manufactured by Matsushita Electric Works, Ltd. was applied to the surface of the bar coater. Was applied and dried at room temperature for 24 hours to form an organic primer layer having a film thickness of 10 μm. Next, "Fresselera NA30" manufactured by Matsushita Electric Works, Ltd., which is a paint containing silicon on this surface.
"0" is applied with a bar coater and further dried at room temperature for 24 hours to form a photocatalyst-free film having a film thickness of 10 μm, which is a paint containing a silicon resin containing titanium oxide. Matsushita Electric Works, Ltd. Made "Frasera PS100
0 "was applied by a bar coater and dried at room temperature for 3 days to prepare a photocatalytic functional film sample 3 provided with a film containing a photocatalyst having a film thickness of 0.1 μm.
【００４２】作製した１組のサンプル３とサンプル４の
光触媒機能膜に、実施例１と同じ条件に調製した光源か
ら紫外線を照射して、各サンプルの光触媒機能膜中の残
留有機物が分解される分解速度の度合いを、光触媒機能
膜上面の水の接触角が１０°以下になるまでの時間を測
定することで求めた。The photocatalyst functional films of the set of Sample 3 and Sample 4 thus prepared were irradiated with ultraviolet rays from a light source prepared under the same conditions as in Example 1 to decompose the residual organic substances in the photocatalyst functional films of each sample. The degree of decomposition rate was determined by measuring the time until the contact angle of water on the upper surface of the photocatalytic functional film became 10 ° or less.
【００４３】また、作製した別の１組のサンプル３とサ
ンプル４を用いて、実施例１と同様に、屋外で南面垂直
暴露を行い、各サンプルの光触媒機能膜に太陽光を照射
して、各サンプルの光触媒機能膜中の残留有機物が分解
される分解速度の度合いを、光触媒機能膜上面の水の接
触角が１０°以下になるまでの時間を測定することで求
めた。Further, by using another set of Sample 3 and Sample 4 thus prepared, as in the case of Example 1, vertical exposure to the south surface was performed, and the photocatalytic functional film of each sample was irradiated with sunlight. The degree of decomposition rate of the residual organic substances in the photocatalytic functional film of each sample was determined by measuring the time until the contact angle of water on the upper surface of the photocatalytic functional film was 10 ° or less.
【００４４】（比較例１）実施例１と同様にしてサンプ
ル１及びサンプル２を作製した。Comparative Example 1 Samples 1 and 2 were prepared in the same manner as in Example 1.
【００４５】作製した１組のサンプル１とサンプル２の
光触媒機能膜に、ブラックライトランプ［松下電器産業
（株）製「ＦＬ１０ＢＬ−Ｂ」（最大の相対強度の波長
３５２ｎｍ／カタログ値）］からなる光源から、第１の
波長領域の照度が５ｍＷ／ｃｍ2となるように調製され
た紫外線を照射して、各サンプルの光触媒機能膜中の残
留有機物が分解される分解速度の度合いを、光触媒機能
膜上面の水の接触角が１０°以下になるまでの時間を測
定することで求めた。A black light lamp [“FL10BL-B” manufactured by Matsushita Electric Industrial Co., Ltd. (wavelength of maximum relative intensity of 352 nm / catalog value)] is provided on the photocatalytic functional film of one set of sample 1 and sample 2 thus prepared. Irradiation of ultraviolet light prepared from the light source so that the illuminance in the first wavelength region is 5 mW / cm 2, and the degree of decomposition rate at which the residual organic substances in the photocatalytic function film of each sample are decomposed is determined by the photocatalytic function. It was determined by measuring the time until the contact angle of water on the upper surface of the film was 10 ° or less.
【００４６】また、作製した別の１組のサンプル１とサ
ンプル２を用いて、実施例１と同様に、屋外で南面垂直
暴露を行い、各サンプルの光触媒機能膜に太陽光を照射
して、各サンプルの光触媒機能膜中の残留有機物が分解
される分解速度の度合いを、光触媒機能膜上面の水の接
触角が１０°以下になるまでの時間を測定するこで求め
た。Further, using another set of Sample 1 and Sample 2 thus prepared, as in the case of Example 1, the vertical exposure to the south surface was carried out, and the photocatalytic functional film of each sample was irradiated with sunlight. The degree of decomposition rate of the residual organic substances in the photocatalytic functional film of each sample was determined by measuring the time until the contact angle of water on the upper surface of the photocatalytic functional film was 10 ° or less.
【００４７】（水の接触角の測定）光触媒機能膜と水と
の接触角の測定は、協和界面科学（株）製の自動接触角
測定器「ＣＡ−Ｗ１５０」を用いて、膜の表面に２．０
μｌの蒸留水を滴下した接触角を測定した。(Measurement of Contact Angle of Water) The contact angle between the photocatalytic functional film and water was measured by using an automatic contact angle measuring device “CA-W150” manufactured by Kyowa Interface Science Co., Ltd. on the surface of the film. 2.0
The contact angle at which μl of distilled water was dropped was measured.
【００４８】（照度の測定）サンプルに照射される紫外
線の照度の測定は、トプコン（株）製の紫外線強度計
「ＵＶＲ２」を用いて測定した。なお、３１０ｎｍ乃至
４００ｎｍの第１の波長領域の照度を測定する場合は、
紫外線強度計の受光部に、３１０ｎｍ乃至４００ｎｍに
測定波長域を有する受光部「ＵＤ−３６」を用い、ま
た、２２０ｎｍ乃至３００ｎｍの第２の波長領域の照度
を測定する場合は、２２０ｎｍ乃至３００ｎｍに測定波
長域を有する受光部「ＵＤ−２５」を用いて測定した。(Measurement of illuminance) The illuminance of the ultraviolet light applied to the sample was measured using an ultraviolet intensity meter "UVR2" manufactured by Topcon Corporation. When measuring the illuminance in the first wavelength region of 310 nm to 400 nm,
In the light receiving part of the ultraviolet intensity meter, the light receiving part "UD-36" having a measurement wavelength range of 310 nm to 400 nm is used, and when measuring the illuminance in the second wavelength range of 220 nm to 300 nm, it is set to 220 nm to 300 nm. It measured using the light receiving part "UD-25" which has a measurement wavelength range.
【００４９】[0049]
【表１】 [Table 1]
【００５０】（結果）評価結果を表１に示す。実施例１
と実施例２においては、いずれも、ブラックライトラン
プと殺菌灯との２種のランプを併用した光源を用いた場
合の、２種のサンプル間の分解速度比と太陽光を用いた
場合の２種のサンプル間の分解速度比との間には、良好
な相関性が認められた。(Results) Table 1 shows the evaluation results. Example 1
In both Example 2 and Example 2, when using a light source in which two types of lamps, a black light lamp and a germicidal lamp, are used in combination, the decomposition rate ratio between two types of samples and the case of using sunlight are 2 A good correlation was observed with the degradation rate ratio between samples of the species.
【００５１】一方、比較例においては、ブラックライト
ランプのみを光源に用いた場合の２種のサンプル間の分
解速度比と太陽光を用いた場合の２種のサンプル間の分
解速度比との間には、良好な相関性が認められなかっ
た。On the other hand, in the comparative example, between the decomposition rate ratio between the two samples when only the black light lamp was used as the light source and the decomposition rate ratio between the two samples when using sunlight. , No good correlation was observed.
【００５２】[0052]
【発明の効果】請求項１〜７に係る発明の光触媒機能膜
の性能評価方法は、基材上面に形成した、紫外線の照射
によって光触媒作用をなす光触媒機能膜の表面に、紫外
線を発する光源からの紫外線を照射して、光触媒機能膜
の性能を評価する光触媒機能膜の性能評価方法におい
て、前記紫外線を発する光源が、３１０ｎｍ乃至４００
ｎｍの第１の波長領域に最大の相対強度の波長を有する
第１のランプと２２０ｎｍ乃至３００ｎｍの第２の波長
領域に最大の相対強度の波長を有する第２のランプを組
み合わせて構成した光源を用いるので、太陽光を用いて
評価した異なる種類の光触媒機能膜間の相対的な性能評
価の結果と、良好な相関性を有する結果を得ることがで
きる。The method for evaluating the performance of a photocatalytic functional film according to the first to seventh aspects of the present invention comprises a light source which emits ultraviolet rays on the surface of the photocatalytic functional film formed on the upper surface of the substrate and which acts as a photocatalyst by the irradiation of ultraviolet rays. In the performance evaluation method for a photocatalytic functional film, the performance of the photocatalytic functional film is evaluated by irradiating the ultraviolet light of
a first lamp having a maximum relative intensity wavelength in a first wavelength region of nm and a second lamp having a maximum relative intensity wavelength in a second wavelength region of 220 nm to 300 nm. Since it is used, it is possible to obtain a result having a good correlation with the result of relative performance evaluation between different types of photocatalytic functional films evaluated using sunlight.
【００５３】また、請求項８に係る発明の光触媒機能塗
膜の性能評価用光源は、３１０ｎｍ乃至４００ｎｍの第
１の波長領域に最大の相対強度の波長を有する第１のラ
ンプと２２０ｎｍ乃至３００ｎｍの第２の波長領域に最
大の相対強度の波長を有する第２ランプを組み合わせて
構成した光源であるので、太陽光を用いて評価した異な
る種類の光触媒機能膜間の相対的な性能評価の結果と、
良好な相関性を有する結果を得ることのできる性能評価
用光源となる。The light source for evaluating the performance of the photocatalytic functional coating film of the invention according to claim 8 is a first lamp having a wavelength of maximum relative intensity in a first wavelength region of 310 nm to 400 nm and 220 nm to 300 nm. Since the light source is configured by combining the second lamp having the wavelength of the maximum relative intensity in the second wavelength region, the result of relative performance evaluation between different types of photocatalytic functional films evaluated using sunlight and ,
The light source for performance evaluation can obtain a result having a good correlation.
Claims (8)
て光触媒作用をなす光触媒機能膜の表面に、紫外線を発
する光源からの紫外線を照射して、光触媒機能膜の性能
を評価する光触媒機能膜の性能評価方法において、前記
紫外線を発する光源が、３１０ｎｍ乃至４００ｎｍの第
１の波長領域に最大の相対強度の波長を有する第１のラ
ンプと２２０ｎｍ乃至３００ｎｍの第２の波長領域に最
大の相対強度の波長を有する第２ランプを組み合わせて
構成した光源であることを特徴とする光触媒機能膜の性
能評価方法。1. A photocatalytic functional film for evaluating the performance of a photocatalytic functional film by irradiating the surface of a photocatalytic functional film formed on a substrate with photocatalytic function by irradiation of ultraviolet light with ultraviolet light from a light source that emits ultraviolet light. In the performance evaluation method according to claim 1, the light source that emits ultraviolet light has a first lamp having a wavelength of maximum relative intensity in a first wavelength region of 310 nm to 400 nm and a maximum relative intensity of light in a second wavelength region of 220 nm to 300 nm. A method for evaluating the performance of a photocatalytic functional film, which is a light source configured by combining a second lamp having a wavelength of
プであり、上記第２のランプが殺菌灯であることを特徴
とする請求項１記載の光触媒機能膜の性能評価方法。2. The method for evaluating the performance of a photocatalytic functional film according to claim 1, wherein the first lamp is a black light lamp and the second lamp is a germicidal lamp.
塗料で形成した皮膜であり、上記基材が無機質基材であ
ることを特徴とする請求項２記載の光触媒機能膜の性能
評価方法。3. The method for evaluating the performance of a photocatalytic functional film according to claim 2, wherein the photocatalytic functional film is a film formed of a paint containing a silicone resin, and the base material is an inorganic base material.
プライマー層を介して形成されたことを特徴とする請求
項３記載の光触媒機能膜の性能評価方法。4. The method for evaluating the performance of a photocatalytic functional film according to claim 3, wherein the photocatalytic functional film is formed on the base material via an organic primer layer.
を同時に照射することを特徴とする請求項１乃至請求項
４のいずれかに記載の光触媒機能膜の性能評価方法。5. The photocatalytic functional film performance evaluation method according to claim 1, wherein the first lamp and the second lamp are simultaneously irradiated.
を同時に照射する場合に、上記第１の波長領域及び上記
第２の波長領域で計測される照度比が１０：８乃至１
０：５であることを特徴とする請求項５記載の光触媒機
能膜の性能評価方法。6. When irradiating the first lamp and the second lamp at the same time, the illuminance ratio measured in the first wavelength region and the second wavelength region is 10: 8 to 1
It is 0: 5, The performance evaluation method of the photocatalyst functional film of Claim 5 characterized by the above-mentioned.
化チタンであることを特徴とする請求項１乃至請求項６
のいずれかに記載の光触媒機能膜の性能評価方法。7. The photocatalyst contained in the photocatalytic functional film is titanium oxide.
A method for evaluating the performance of a photocatalytic functional film according to any one of 1.
領域に最大の相対強度の波長を有する第１のランプと２
２０ｎｍ乃至３００ｎｍの第２の波長領域に最大の相対
強度の波長を有する第２のランプを組み合わせて構成し
たことを特徴とする光触媒機能膜の性能評価用光源。8. A first lamp having a wavelength of maximum relative intensity in a first wavelength region of 310 nm to 400 nm and 2
A light source for performance evaluation of a photocatalytic functional film, which is configured by combining a second lamp having a wavelength of maximum relative intensity in a second wavelength region of 20 nm to 300 nm.
Priority Applications (1)
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|---|---|---|---|
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001257513A JP2003066027A (en) | 2001-08-28 | 2001-08-28 | Performance evaluation method of photocatalytic functional film and performance evaluation light source of photocatalytic functional film |
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| Publication Number | Publication Date |
|---|---|
| JP2003066027A true JP2003066027A (en) | 2003-03-05 |
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ID=19085155
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| Application Number | Title | Priority Date | Filing Date |
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| Country | Link |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007108350A1 (en) * | 2006-03-22 | 2007-09-27 | National University Corporation Hokkaido University | Method for testing photocatalyst function and apparatus for use in the test |
-
2001
- 2001-08-28 JP JP2001257513A patent/JP2003066027A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007108350A1 (en) * | 2006-03-22 | 2007-09-27 | National University Corporation Hokkaido University | Method for testing photocatalyst function and apparatus for use in the test |
| JP2007256010A (en) * | 2006-03-22 | 2007-10-04 | Noritake Co Ltd | Testing method of photocatalyst function, and appliance used for testing |
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