JP5128084B2 - 光触媒部材 - Google Patents
光触媒部材 Download PDFInfo
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- JP5128084B2 JP5128084B2 JP2006123588A JP2006123588A JP5128084B2 JP 5128084 B2 JP5128084 B2 JP 5128084B2 JP 2006123588 A JP2006123588 A JP 2006123588A JP 2006123588 A JP2006123588 A JP 2006123588A JP 5128084 B2 JP5128084 B2 JP 5128084B2
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- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
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Description
基材が、繊維と熱硬化性樹脂と無機材とよりなる芯材層と、その上に積層一体化された樹脂含浸化粧層とよりなる化粧板であり、
硬化性樹脂層が、熱硬化性メラミン樹脂を用いて形成された厚さ20〜200nmの層であって、ブラックライトブルーランプを用いて1mW/cm2の強度の光を168時間照射した硬化性樹脂層の表面の水との接触角が35〜90°であり、且つ、硬化性樹脂層の表面におけるメチレンブルーの分解活性指数Rが3.8〜4.7[nmol/l/min]であり、
光触媒層の厚さが5〜300nmであり、
基材と光触媒層との間に保護層が形成されている、ことを特徴とするものである。
特に、硬化性樹脂層の表面におけるメチレンブルーの分解活性指数Rが3.8〜4.7[nmol/l/min]であると、硬化性樹脂層の表面における悪臭成分や低分子量有機物の分解作用、及び、抗菌・防黴作用を十分発揮することができる。
さらに、接着性樹脂塗料、保護層用塗料、光触媒層用塗料、液状硬化性樹脂をこの順で塗布、乾燥、硬化させた転写フィルムを作製して基材に転写する方法を用いてもよい。
さらに、接着性樹脂塗料、保護層用塗料、光触媒層用塗料、液状硬化性樹脂をこの順で塗布、乾燥、硬化させたラミネートフィルムを作製してホットプレスにより一体化して光触媒部材Cを製造してもよい。
基材として、ガラス繊維に熱硬化性メラミン樹脂を含浸させると共に無機材としての水酸化アルミニウム、炭酸カルシウムとを含有させた芯材層と、酸化チタンを含有する化粧紙に熱硬化性メラミン樹脂を含浸させた樹脂含浸化粧層とをホットプレスによって積層一体化してなる化粧板を準備した。
光触媒部材を60mm角の大きさに切断して3個の試験片を作製し、各試験片の上に円筒形のセルをシリコーングリースで液密的に取付けて、各セルにメチレンブルー吸着液(メチレンブルー三水和物を精製水に0.02mmol/l濃度となるように溶解させた液)を35mlを注入し、カバーガラスで蓋をして、吸着飽和状態になるまでメチレンブルーを吸着させる。そして、セル中のメチレンブルー吸着液を新しいメチレンブルー試験液0.01mmolに交換して、真上から各試験片に1±0.05mW/cm2の紫外線を20分照射し、照射後直ちにメチレンブルー試験液の600〜700nmの波長域での吸光スペクトルを分光光度計で測定し、測定に使用した液をすみやかにセルに戻して再び紫外線を照射する。このような手順で紫外線を20分照射して吸光スペクトルを測定する作業を、照射時間の合計が3時間になるまで9回繰り返す。そして、次の手順で分解活性示数を求める。
即ち、紫外線t分照射後の吸光スペクトルのピークトップにおける吸光度Abs(t)を読み取る(t=20,40,60,80,100,120,140,160,180)と共に、初期吸光スペクトルのピークトップにおける吸光度を読み取ってこれをAbs(0)とする。そして、Abs(0)を用いて、下記の式(1)より、吸光度を濃度に換算するための換算係数Kを求め、この換算係数Kを用いて、下記の式(2)より、吸光度Abs(t)を、t分後のメチレンブルー試験液濃度C(t)[μmol/l]に換算し、図4に示すように、縦軸にC(t)[μmol/l]を、横軸に紫外線照射時間(分)をとって、3個の試験片のそれぞれについてデータをプロットする。そして、各試験片について求めた傾き(最も傾きが大きくなる4点を選んで最小二乗法で直線近似した傾き)をan(n=1,2,3)とし、下記の式(3)により分解活性示数Rを求める。
K=10[μmol/l]/Abs(0) …式(1)
C(t)=K×Abs(t)[μmol/l] …式(2)
R=|(a1+a2+a3)/3|×103[nmol/l/] …式(3)
染色堅牢度試験用摩擦試験機(JIS L 0823)を平板用に改良し、この試験機に錘(200g)と摩擦用白綿布かなきん3号(JIS L 0862)を取付け、試験片を500回、及び3000回払拭する。そして、各試験片を0.1Nの硝酸銀溶液に浸漬し、ブラックライトブルーランプにて1±0.05mW/cm2の紫外線を5時間照射し、各試験片の表面における銀の析出の有無(硝酸銀の呈色反応の有無)によって、試験片の光触媒層の有無を判断する。
基材として、ガラス繊維に熱硬化性メラミン樹脂を含浸させると共に無機材としての水酸化アルミニウム、炭酸カルシウムを含有させた芯材層用シートと、酸化チタンを含有する化粧紙に熱硬化性メラミン樹脂を含浸させた樹脂含浸化粧層用シートとを準備した。
基材として、実施例1と同じ化粧板を準備した。
実施例1で作製した転写フィルムに代えて、剥離フィルムの表面に厚さ100nmの光触媒層と厚さ3.0μmの保護層と厚さ5.0μmの接着剤層を積層した転写フィルムを作製した以外は実施例1と同様にして、化粧板の表面に保護層と光触媒層を積層一体化した比較例1の光触媒部材(表面に硬化性樹脂層のないもの)を作製した。
1a 芯材層
1b 樹脂含浸化粧層
2 保護層
3 光触媒層
4 硬化性樹脂層
5 接着剤層
A,B,C 光触媒部材
Claims (2)
- 基材の表面に光触媒層を積層すると共に、光触媒層の表面に硬化性樹脂層を積層した光触媒部材であって、
基材が、繊維と熱硬化性樹脂と無機材とよりなる芯材層と、その上に積層一体化された樹脂含浸化粧層とよりなる化粧板であり、
硬化性樹脂層が、熱硬化性メラミン樹脂を用いて形成された厚さ20〜200nmの層であって、ブラックライトブルーランプを用いて1mW/cm2の強度の光を168時間照射した硬化性樹脂層の表面の水との接触角が35〜90°であり、且つ、硬化性樹脂層の表面におけるメチレンブルーの分解活性指数Rが3.8〜4.7[nmol/l/min]であり、
光触媒層の厚さが5〜300nmであり、
基材と光触媒層との間に保護層が形成されている、
ことを特徴とする光触媒部材。 - 基材と保護層との間に接着剤層が形成されている請求項1に記載の光触媒部材。
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