JP3640901B2 - Coating film creation method - Google Patents
Coating film creation method Download PDFInfo
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- JP3640901B2 JP3640901B2 JP2001122576A JP2001122576A JP3640901B2 JP 3640901 B2 JP3640901 B2 JP 3640901B2 JP 2001122576 A JP2001122576 A JP 2001122576A JP 2001122576 A JP2001122576 A JP 2001122576A JP 3640901 B2 JP3640901 B2 JP 3640901B2
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- photocatalyst
- coating film
- water
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- sprayed
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- 238000000576 coating method Methods 0.000 title claims description 78
- 239000011248 coating agent Substances 0.000 title claims description 74
- 238000000034 method Methods 0.000 title claims description 35
- 239000011941 photocatalyst Substances 0.000 claims description 124
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 48
- 239000007788 liquid Substances 0.000 claims description 29
- 239000000758 substrate Substances 0.000 claims description 28
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 claims description 23
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 19
- 239000007921 spray Substances 0.000 claims description 18
- 238000005507 spraying Methods 0.000 claims description 14
- 239000000463 material Substances 0.000 claims description 13
- 239000002994 raw material Substances 0.000 claims description 8
- 239000005357 flat glass Substances 0.000 claims description 4
- 239000000243 solution Substances 0.000 description 21
- 229910010413 TiO 2 Inorganic materials 0.000 description 9
- 230000001699 photocatalysis Effects 0.000 description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 238000001704 evaporation Methods 0.000 description 4
- SOQBVABWOPYFQZ-UHFFFAOYSA-N oxygen(2-);titanium(4+) Chemical class [O-2].[O-2].[Ti+4] SOQBVABWOPYFQZ-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000008020 evaporation Effects 0.000 description 3
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- 239000003599 detergent Substances 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000002243 precursor Substances 0.000 description 2
- 239000005871 repellent Substances 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 125000000962 organic group Chemical group 0.000 description 1
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000012643 polycondensation polymerization Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 229920002050 silicone resin Polymers 0.000 description 1
- CMPGARWFYBADJI-UHFFFAOYSA-L tungstic acid Chemical compound O[W](O)(=O)=O CMPGARWFYBADJI-UHFFFAOYSA-L 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 229910001928 zirconium oxide Inorganic materials 0.000 description 1
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- Application Of Or Painting With Fluid Materials (AREA)
Description
【0001】
【発明の属する技術分野】
本発明は、基材上に未塗布箇所ができずに完全で均一な光触媒コーティング膜や親水性コーティング膜を作成することができる方法に関するものである。
【0002】
【従来の技術】
光触媒コーティング膜や親水性コーティング膜を作成する方法としては、従来から、基材にスプレーして乾燥させる方法、刷毛塗り法、ディップ法等が知られており、既存のものへのコーティングでは、スプレーして乾燥させる方法及び刷毛塗り法が主に用いられている。
【0003】
また、光触媒のコーティングに関する従来技術としては、例えば、特開平10−95635号公報に、基材表面に有機チタネートを塗布した後、有機チタネートを加水分解及び脱水縮重合させ、ついで、コロナ放電又はプラズマ放電により残留有機基を除去し、その後、タングステン酸含有水溶液を塗布して焼成を行うという方法が開示されている。
また、特開2000−95969号公報には、光触媒粒子と、シリカ微粒子、シリコーン樹脂皮膜前駆体及びシリカ皮膜前駆体の少なくとも1種を含有する組成物を自動車車体に既存の方法で塗布するという技術が開示されている。
【0004】
【発明が解決しようとする課題】
上述した既存のコーティング法では、いずれも専用の機具や塗布者の熟練度がなければ、光彩が出るなど、純粋に透明な光触媒コーティング膜を作成することは困難であった。すなわち、従来のコーティング法では、基材上に光触媒液が厚く塗布された箇所や逆に全く塗布されていない箇所が生じてしまい、光触媒未塗布箇所を残すことなく、均一な光触媒コーティング膜を作成することは困難であった。
【0005】
本発明は上記の諸点に鑑みなされたもので、本発明の目的は、特に専用機具や熟練度を要することなく、容易に、未塗布箇所のない完全で均一な光触媒コーティング膜や親水性コーティング膜を作成することができるコーティング膜作成方法を提供することにある。
【0006】
【課題を解決するための手段】
上記の目的を達成するために、本発明のコーティング膜作成方法は、光触媒コーティング膜を基材上に作成するに際し、光触媒の原料である酸化チタンを含む液をスプレー状で基材上に噴霧して光触媒液を基材上に塗布し、その直後に塗布面に水をかけることによって光触媒液の厚塗り箇所から厚塗りとなっている光触媒液のみを取り除き、均一な光触媒コーティング膜を作成するように構成されている(図1、図2、図3参照)。
【0007】
また、本発明の方法は、光触媒コーティング膜を基材上に作成するに際し、光触媒の原料である酸化チタンを含む液を基材上に噴霧し、光触媒を基材上に塗布した後に水を噴霧することにより、光触媒特有の親水性の性質を利用して光触媒が塗布されていない箇所を判別し、該箇所に光触媒液を噴霧して光触媒未塗布箇所のない光触媒コーティング膜を作成することを特徴としている(図4参照)。
この場合、光触媒液の噴霧と水の噴霧を繰り返して基材上に光触媒を塗布していく過程で、光触媒特有の親水性の性質を利用し、光触媒未塗布箇所のない光触媒コーティング膜を形成させることが好ましい。
【0008】
上記のように、光触媒の原料である酸化チタンを含む液をスプレー状で基材上に噴霧し、基材上で液中の揮発分を蒸発させることで基材と光触媒を密着させる過程において、光触媒液の噴霧直後に水を噴霧させることで、基材上の光触媒液が厚く塗布された箇所を薄くのばし、余分な光触媒液が取り除かれる。一般に、均一な光触媒コーティング膜の作成には、専用の機材や塗布者の熟練度を要するが、本発明の方法を用いれば、そのような専用の機材や熟練度を要することなく、容易に基材上へ均一な光触媒コーティング膜を作成することが可能となる。また、通常、透明の光触媒コーティング膜の作成では、光触媒塗布箇所と光触媒未塗布箇所の区別が非常につきにくいところが問題となっていたが、本発明の方法を用いれば、光触媒液を塗布した後に水をかけながら塗布するため、基材表面の親水性をすぐにチェックすることが可能となり、光触媒の塗布時点で親水箇所と非親水箇所の区別が容易にでき、光触媒未塗布箇所を残すことなく、均一な光触媒コーティング膜を作成することが可能となる。
【0009】
また、本発明の方法は、親水性コーティング膜を基材上に作成するに際し、コーティング膜の原料である親水性液をスプレー状で基材上に噴霧して親水性液を基材上に塗布し、その直後に塗布面に水をかけることによって親水性液の厚塗り箇所から厚塗りとなっている親水性液のみを取り除き、均一な親水性コーティング膜を作成することを特徴としている。
【0010】
また、本発明の方法は、親水性コーティング膜を基材上に作成するに際し、コーティング膜の原料である親水性液を基材上に噴霧して塗布した後に水を噴霧することにより、塗布面の親水化性質を利用して親水性コーティングがなされていない箇所を判別し、該箇所に親水性液を噴霧して未塗布箇所のない親水性コーティング膜を作成することを特徴としている。
この場合、親水性液の噴霧と水の噴霧を繰り返して基材上に親水性コーティングを行う過程で、親水化性質を利用し、未塗布箇所のない親水性コーティング膜を形成させることが好ましい。
【0011】
なお、親水性コーティング膜としては、酸化チタン等を含む光触媒の他に、例えば、酸化ジルコニウムなどの金属酸化物等が挙げられる。
【0012】
【発明の実施の形態】
以下、本発明の実施の形態について説明するが、本発明は下記の実施の形態に何ら限定されるものではなく、適宜変更して実施することが可能なものである。
まず、図面を参照しながら、本発明のコーティング膜作成方法について詳細に説明する。
(1)光触媒液噴霧
図1に示すように、基材10の表面に光触媒液をスプレー状に塗布した段階では、酸化チタン(TiO2を含有する液滴)12が不均一に基材10上に塗布され、不均一なTiO2膜(光触媒層)が形成される。14は光触媒スプレー缶である。図2に示すように、光触媒液の塗布直後は、基材表面に酸化チタンが強固に付着しているのに対し、厚塗り箇所の酸化チタン同士は弱い結合力で付着している。
【0013】
(2)水噴霧
光触媒液を基材上に塗布した直後に水をかけると、光触媒の親水性効果により水分子とTiO2分子が物理吸着又は化学結合する。このときの結合力の大小は以下のように考えられる。
TiO2−TiO2<TiO2−H2O<TiO2−M(基材)
このように、酸化チタンと水の結合力は、酸化チタン同士の結合力よりは強いが、酸化チタンと基材の結合力よりは弱いので、図3に示すように、水16が流れ落ちる際には、厚塗り箇所となっている酸化チタン12同士の結合は切れて水16とともに流れ落ち、基材10と酸化チタン12の結合は残ることになる。したがって、光触媒塗布直後で(具体的には、揮発分が完全に蒸発しておらず)酸化チタン同士の結合が不安定な状態のうちに水をかけることによって、厚塗りとなっている酸化チタンのみを取り除くことができ、均一な光触媒(TiO2)コーティング膜を容易に作成することが可能となる。
【0014】
つぎに、基材上に厚塗り箇所のない均一な光触媒コーティング膜を形成させた後に水を噴霧して光触媒未塗布箇所を判別する手法について説明する(図4参照)。
(1)水噴霧
光触媒未塗布部分のある基材10に水を噴霧する。
【0015】
(2)光触媒未塗布箇所の判別
光触媒(酸化チタン)未塗布箇所が撥水性の場合は、酸化チタンの未塗布部分に水がかかっても水をはじき、水膜の中に空隙が生じるので、その箇所が光触媒未塗布箇所18と判定できる。したがって、その箇所を重点的に光触媒塗布を再度行うことにより、光触媒未塗布箇所のない完全で均一な光触媒コーティング膜を形成させることができる。
光触媒(酸化チタン)未塗布箇所が撥水性でない場合は、酸化チタンの塗布部分、未塗布部分の全面に水膜が形成されるが、水膜が流れ落ちる段階で、酸化チタン未塗布箇所の窪みに落ち込んだ水滴16が残存するので、その箇所が光触媒未塗布箇所20と判定できる。したがって、その箇所を重点的に光触媒塗布を再度行うことにより、光触媒未塗布箇所のない完全で均一な光触媒コーティング膜を形成させることができる。
このように、本手法では光触媒塗布時に水をかけながら塗布を行うため、光触媒の塗り損ねの非常に少ない塗布方法となる。
【0016】
本発明の実施の一形態として、自動車の車体に光触媒コーティング膜を作成する方法について記述する。
(1) 光触媒コーティング膜を施す自動車の車体を十分に洗浄する。このとき通常の洗剤でとれない水あか汚れがある場合は、水あか分解用の洗剤等を用いて十分に塗布面を洗浄する。なお、車体にワックス分が付着している場合は、付着したワックス分も十分に取り除いておく。
(2) 洗浄後、水で濡れた状態のまま、光触媒の原料である酸化チタンを含む液をスプレー状に車体面に噴霧し、微細な液滴の形で車体面に光触媒液を付着させる。このとき光触媒をできるだけ均一に塗布するために、スプレーノズルの先端と車体面との距離を、一例として、約30cm程度離す。この距離が近すぎると液中のアルコール等の揮発分が車体面で多量に蒸発して光触媒が不均一なままで密着してしまい、この距離が遠すぎると光触媒液が車体面に充分に付着しないという不都合がある。ただし、この距離は、スプレーの噴霧圧により前後する。
【0017】
(3) 車体面に付着した光触媒液は、液中の揮発分が瞬時に蒸発し、その蒸発過程で光触媒の主成分である酸化チタンが車体面に接着していくため、光触媒液を噴霧した直後(例えば、約5〜20秒以内)に、光触媒塗布面全体に水をかけて洗い流す。なお、温度が高いときは揮発分の蒸発が速いので、より迅速に水噴霧を行う必要があり、逆に温度が低いときは揮発分の蒸発が遅いので、水噴霧に多少の時間的余裕ができる。
(4) 車体面に光触媒液を塗布した直後では、光触媒が車体面に強固に付着しておらず、特に厚塗りの状態で付着している光触媒液は硬い接着がなされていないため、その上に水をかけることによって、厚塗りの部分の光触媒液は車体側よりも噴霧される水と強固に物理吸着又は化学結合し、厚塗り部分の光触媒液のみが噴霧した水とともに車体から流れ落ちる。
【0018】
(5) この作用により、光触媒液が厚塗りされることなく、ほぼ均一に車体面に光触媒コーティング膜が形成される。
(6) 本手法による光触媒コーティング膜作成方法を車体面全体に適用することによって、車体面全体に薄く均一な光触媒コーティング膜を形成させることが可能となる。
【0019】
(7) また、光触媒液をスプレー状に噴霧するとともに水を噴霧しながら光触媒コーティング膜を形成させていくが、光触媒液が付着していない車体面は一般的に水をはじき、光触媒液が付着した車体面は水になじむ性質を利用して、この光触媒コーティング膜の作成時点で、上述したような手法を用いて光触媒塗布面と光触媒未塗布面を識別することが可能となる。なお、車体面の撥水性が落ちて水をあまりはじかない場合でも、噴霧した水が流れ落ちる過程で光触媒未塗布部分の窪みに水滴が残るため、同様に、光触媒塗布面と光触媒未塗布面を識別することが可能である。
(8) この光触媒特有の親水性の性質を利用し、光触媒未塗布面に対して重点的に光触媒を再塗布することによって、車体全体に光触媒未塗布箇所ができずに完全で均一な光触媒コーティング膜を作成することが可能となる。
【0020】
本実施の形態では、一例として、光触媒コーティングを自動車の車体に適用する場合について説明したが、本発明の方法の適用対象はこれに限定されるものではなく、例えば、窓ガラスや外壁等に適用することが可能である。
【0021】
【発明の効果】
本発明は上記のように構成されているので、つぎのような効果を奏する。
(1) 光触媒液又は親水性液を基材上に噴霧した直後に水をかけることにより、基材表面に薄く均一な光触媒コーティング膜又は親水性コーティング膜を形成させることができる。
(2) 光触媒液又は親水性液の噴霧と水の噴霧を繰り返してコーティング膜を形成させていく過程で、光触媒液又は親水性液の塗布面が親水性となる性質を利用して、光触媒液又は親水性液の未塗布箇所を判別することができ、この未塗布箇所に重点的に再塗布を行うことにより、基材表面に未塗布箇所ができずに光触媒コーティング膜又は親水性コーティング膜を形成させることができる。
(3) 専用機具や熟練度を要することなく、容易に、未塗布箇所のない完全で均一な光触媒コーティング膜や親水性コーティング膜を作成することができる。
【図面の簡単な説明】
【図1】本発明のコーティング膜作成方法の概念を模式的に示す概略断面説明図(光触媒液をスプレー状に噴霧した状態)である。
【図2】本発明のコーティング膜作成方法の概念を模式的に示す概略断面説明図(図1における結合力の関係)である。
【図3】本発明のコーティング膜作成方法の概念を模式的に示す概略断面説明図(水を噴霧して光触媒の厚塗り部を取り除く工程)である。
【図4】本発明のコーティング膜作成方法の概念を模式的に示す概略断面説明図(水を噴霧して光触媒未塗布箇所を判別する手法)である。
【符号の説明】
10 基材
12 酸化チタン(TiO2を含有する液滴)
14 光触媒スプレー缶
16 水(水滴)
18、20 光触媒未塗布箇所[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method capable of producing a complete and uniform photocatalytic coating film or hydrophilic coating film without forming an uncoated portion on a substrate.
[0002]
[Prior art]
Conventionally known methods for creating a photocatalyst coating film and a hydrophilic coating film include a method of spraying and drying on a substrate, a brush coating method, a dip method, and the like. The drying method and the brush coating method are mainly used.
[0003]
Further, as a conventional technique relating to photocatalyst coating, for example, in Japanese Patent Application Laid-Open No. 10-95635, an organic titanate is applied to a substrate surface, and then the organic titanate is hydrolyzed and dehydrated by condensation polymerization, followed by corona discharge or plasma. A method is disclosed in which residual organic groups are removed by discharge, and then a tungstic acid-containing aqueous solution is applied and baked.
Japanese Patent Laid-Open No. 2000-95969 discloses a technique in which a composition containing at least one of photocatalyst particles, silica fine particles, a silicone resin film precursor, and a silica film precursor is applied to an automobile body by an existing method. Is disclosed.
[0004]
[Problems to be solved by the invention]
In any of the above-described existing coating methods, it is difficult to produce a purely transparent photocatalytic coating film, such as a radiance if there is no special equipment or skill level of the applicator. That is, with the conventional coating method, a portion where the photocatalyst solution is applied thickly on the substrate or a portion where no photocatalyst is applied is generated, and a uniform photocatalyst coating film is created without leaving a portion where the photocatalyst is not applied. It was difficult to do.
[0005]
The present invention has been made in view of the above points, and the object of the present invention is to provide a complete and uniform photocatalytic coating film or hydrophilic coating film with no unapplied portions, without requiring special equipment or skill level. It is an object of the present invention to provide a method for forming a coating film capable of forming a coating film.
[0006]
[Means for Solving the Problems]
In order to achieve the above-described object, the coating film preparation method of the present invention sprays a liquid containing titanium oxide, which is a raw material for the photocatalyst, on the base material when the photocatalyst coating film is formed on the base material. Apply the photocatalyst solution on the substrate, and then immediately apply water to the coating surface to remove only the thick photocatalyst solution from the thick coating area of the photocatalyst solution and create a uniform photocatalyst coating film (See FIGS. 1, 2, and 3).
[0007]
In addition, when the photocatalyst coating film is formed on the substrate, the method of the present invention sprays a liquid containing titanium oxide as a raw material of the photocatalyst on the substrate, and sprays water after the photocatalyst is applied on the substrate. By using the hydrophilic property peculiar to the photocatalyst, a portion where the photocatalyst is not applied is discriminated, and a photocatalyst solution is sprayed on the portion to create a photocatalyst coating film having no photocatalyst uncoated portion. (See FIG. 4).
In this case, in the process of applying the photocatalyst on the substrate by repeating the spraying of the photocatalyst liquid and the water, the photocatalyst coating film without the photocatalyst uncoated portion is formed by utilizing the hydrophilic property peculiar to the photocatalyst. It is preferable.
[0008]
As described above, in the process of spraying a liquid containing titanium oxide, which is a raw material of the photocatalyst, onto the base material in a spray form, and evaporating the volatile matter in the liquid on the base material, By spraying water immediately after the photocatalyst solution is sprayed, the portion where the photocatalyst solution is thickly applied on the substrate is thinned, and the excess photocatalyst solution is removed. In general, the creation of a uniform photocatalytic coating film requires specialized equipment and skill of an applicator. However, when the method of the present invention is used, it is easily possible to use such equipment without requiring specialized equipment and skill. A uniform photocatalytic coating film can be formed on the material. In addition, normally, in the production of a transparent photocatalyst coating film, there is a problem that it is very difficult to distinguish between a photocatalyst-applied portion and a photocatalyst-uncoated portion. It is possible to immediately check the hydrophilicity of the substrate surface because it is applied while applying the photocatalyst, easily distinguish between hydrophilic and non-hydrophilic parts at the time of application of the photocatalyst, without leaving a photocatalyst uncoated part, It becomes possible to create a uniform photocatalytic coating film.
[0009]
In addition, when the hydrophilic coating film is formed on the substrate, the method of the present invention sprays the hydrophilic liquid, which is the raw material of the coating film, on the substrate in a spray form to apply the hydrophilic liquid onto the substrate. Then, immediately after that, water is applied to the coated surface to remove only the thick hydrophilic liquid from the thickly coated portion of the hydrophilic liquid, thereby creating a uniform hydrophilic coating film.
[0010]
In addition, the method of the present invention can be applied to the application surface by spraying water after applying a hydrophilic liquid, which is a raw material of the coating film, on the substrate when forming the hydrophilic coating film on the substrate. It is characterized in that a portion where the hydrophilic coating is not made is discriminated by utilizing the hydrophilic property of this, and a hydrophilic coating film having no uncoated portion is prepared by spraying a hydrophilic liquid on the portion.
In this case, it is preferable to form a hydrophilic coating film having no unapplied portion by utilizing the hydrophilization property in the process of performing hydrophilic coating on the substrate by repeatedly spraying the hydrophilic liquid and spraying water.
[0011]
Examples of the hydrophilic coating film include a metal oxide such as zirconium oxide in addition to a photocatalyst including titanium oxide.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described, but the present invention is not limited to the following embodiments, and can be implemented with appropriate modifications.
First, the coating film forming method of the present invention will be described in detail with reference to the drawings.
(1) Photocatalyst spray As shown in FIG. 1, at the stage where the photocatalyst solution is applied to the surface of the
[0013]
(2) When water is applied immediately after the water spray photocatalyst solution is applied on the substrate, water molecules and TiO 2 molecules are physically adsorbed or chemically bonded due to the hydrophilic effect of the photocatalyst. The magnitude of the binding force at this time can be considered as follows.
TiO 2 —TiO 2 <TiO 2 —H 2 O <TiO 2 —M (base material)
Thus, the binding force between titanium oxide and water is stronger than the binding force between titanium oxides, but is weaker than the binding force between titanium oxide and the base material. Therefore, when
[0014]
Next, a method will be described in which a uniform photocatalyst coating film having no thick coating portion is formed on the substrate and then water is sprayed to discriminate the portion where the photocatalyst is not applied (see FIG. 4).
(1) Water is sprayed on the
[0015]
(2) Discrimination of the photocatalyst non-applied part When the photocatalyst (titanium oxide) non-applied part is water-repellent, water is repelled even if water is applied to the non-coated part of titanium oxide, and voids are generated in the water film The location can be determined as the photocatalyst-
If the photocatalyst (titanium oxide) uncoated part is not water-repellent, a water film is formed on the entire surface of the titanium oxide coated part and uncoated part. Since the dropped
Thus, in this method, since application is performed while applying water at the time of photocatalyst application, it is an application method with very little loss of application of the photocatalyst.
[0016]
As an embodiment of the present invention, a method for producing a photocatalyst coating film on a car body of an automobile will be described.
(1) Thoroughly clean the automobile body to which the photocatalyst coating film is applied. At this time, if there is a water stain that cannot be removed with a normal detergent, the surface to be coated is thoroughly cleaned with a water decomposing detergent or the like. In addition, when the wax component has adhered to the vehicle body, the adhered wax component is sufficiently removed.
(2) After washing, a liquid containing titanium oxide, which is a raw material of the photocatalyst, is sprayed on the vehicle body surface in a wet state with water, and the photocatalyst solution is adhered to the vehicle surface in the form of fine droplets. At this time, in order to apply the photocatalyst as uniformly as possible, the distance between the tip of the spray nozzle and the surface of the vehicle body is about 30 cm as an example. If this distance is too close, a large amount of volatile components such as alcohol in the liquid will evaporate on the surface of the vehicle, and the photocatalyst will adhere in a non-uniform manner. If this distance is too far, the photocatalyst will adhere sufficiently to the surface of the vehicle. There is an inconvenience of not. However, this distance varies depending on the spray pressure of the spray.
[0017]
(3) The photocatalyst liquid adhering to the surface of the vehicle is sprayed with the photocatalyst liquid because the volatile components in the liquid are instantly evaporated and titanium oxide, which is the main component of the photocatalyst, adheres to the surface of the vehicle during the evaporation process. Immediately after (for example, within about 5 to 20 seconds), the entire photocatalyst-coated surface is washed with water. When the temperature is high, the evaporation of volatile matter is fast, so it is necessary to spray the water more quickly.On the other hand, when the temperature is low, the evaporation of volatile matter is slow, so there is some time margin for water spraying. it can.
(4) Immediately after the photocatalyst solution is applied to the vehicle surface, the photocatalyst is not firmly attached to the vehicle surface, and the photocatalyst solution adhering particularly in a thick coating state is not hard-bonded. By applying water to the photocatalyst, the photocatalyst liquid in the thick-coated part is physically adsorbed or chemically bonded to the sprayed water from the vehicle body side, and only the photocatalyst liquid in the thick-coated part flows down from the car body together with the sprayed water.
[0018]
(5) By this action, the photocatalyst coating film is formed almost uniformly on the vehicle body surface without the photocatalyst liquid being thickly applied.
(6) By applying the photocatalyst coating film forming method according to the present method to the entire vehicle surface, it is possible to form a thin and uniform photocatalyst coating film on the entire vehicle surface.
[0019]
(7) Also, the photocatalyst solution is sprayed and the photocatalyst coating film is formed while spraying water, but the surface of the vehicle body to which the photocatalyst solution has not adhered generally repels water and the photocatalyst solution adheres. By utilizing the property that the vehicle body surface is compatible with water, the photocatalyst-coated surface and the photocatalyst-uncoated surface can be discriminated using the above-described method at the time of forming the photocatalyst coating film. Even if the water repellency of the vehicle body surface drops and water is not repelled, water droplets remain in the depressions of the uncoated photocatalyst as the sprayed water flows, so the photocatalyst coated surface and the uncoated photocatalyst surface are also distinguished. Is possible.
(8) Utilizing the hydrophilic property peculiar to this photocatalyst, by re-applying the photocatalyst to the uncoated photocatalyst surface, the photocatalyst coating is completely and uniformly applied to the entire vehicle body without any photocatalyst uncoated portion. A film can be created.
[0020]
In the present embodiment, as an example, the case where the photocatalyst coating is applied to the body of an automobile has been described. However, the application target of the method of the present invention is not limited to this, and is applied to, for example, a window glass or an outer wall. Is possible.
[0021]
【The invention's effect】
Since this invention is comprised as mentioned above, there exist the following effects.
(1) A thin and uniform photocatalyst coating film or hydrophilic coating film can be formed on the substrate surface by applying water immediately after the photocatalyst solution or hydrophilic liquid is sprayed on the substrate.
(2) A photocatalyst solution that utilizes the property that the coating surface of the photocatalyst solution or hydrophilic liquid becomes hydrophilic in the process of forming the coating film by repeating spraying of the photocatalyst liquid or hydrophilic liquid and water. Alternatively, it is possible to determine the non-applied portion of the hydrophilic liquid, and by re-applying to this non-coated portion, the photocatalyst coating film or the hydrophilic coating film can be formed without forming the non-coated portion on the substrate surface. Can be formed.
(3) A complete and uniform photocatalytic coating film or hydrophilic coating film with no unapplied portions can be easily produced without requiring special equipment or skill.
[Brief description of the drawings]
FIG. 1 is a schematic cross-sectional explanatory view (in a state where a photocatalyst solution is sprayed in a spray form) schematically showing the concept of a coating film forming method of the present invention.
FIG. 2 is a schematic cross-sectional explanatory view (relationship of bonding force in FIG. 1) schematically showing the concept of the coating film forming method of the present invention.
FIG. 3 is a schematic cross-sectional explanatory view (step of removing the thick coating portion of the photocatalyst by spraying water) schematically showing the concept of the coating film forming method of the present invention.
FIG. 4 is a schematic cross-sectional explanatory view (method for spraying water to discriminate a place where a photocatalyst is not applied) schematically showing the concept of the coating film forming method of the present invention.
[Explanation of symbols]
10
14 Photocatalyst spray can 16 Water (water droplets)
18, 20 Photocatalyst uncoated part
Claims (3)
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JP2001122576A JP3640901B2 (en) | 2001-04-20 | 2001-04-20 | Coating film creation method |
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