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Korean Chemical Engineering Research,
Vol.49, No.5, 535-540, 2011
Vol.49, No.5, 535-540, 2011
Colloidal Silica가 Sol-Gel 하드 코팅 막의 광 변색 특성에 미치는 영향
Effect of Colloidal Silica on the Photochromic Properties of Hard Coating Films Prepared by Sol-Gel Method
금속염인 lanthanum nitrate를 증류수에 용해시킨 후 실란커플링제인 γ-glycidyloxypropyl trimethoxysilane과 금속산 화물인 colloidal silica를 이 용액에 첨가하여 sol-gel법에 의해 유-무기 혼성 용액을 제조하였다. 또한 spiropyran계 광변색 염료를 용매인 tetrahydrofuran에 용해시킨 후 앞서 제조한 혼성 용액과 혼합하여 광 변색 코팅 용액을 제조하였다. 그 후 기재인 polycarbonate 시트에 코팅시키고 열 경화시켜 광 변색성을 갖는 하드 코팅 막을 제조하였다. 이 과정 중 colloidal silica의 첨가량이 코팅 막의 광변색 특성에 미치는 영향을 조사하였다. Colloidal silica의 첨가량이 증가할수록 코팅 막의 소색속도가 빨라졌으며 연필경도가 증가하였다.
Organic-inorganic hybrid coating solutions were prepared starting from colloidal silica, lanthanum nitrate and γ-glycidoxypropyl trimethoxysilane by the sol-gel method. Also, spiropyran-doped hard coating solutions were prepared by mixing the spiropyran solution, obtained after dissolving spiropyran dye into tetrahydrofuran solvent, with the organic-inorgnic hybrid coating solutions. The spiropyran-doped hard coating solutions were applied as a thin layer to polycarbonate sheets, and their photochromic properties were investigated. The effect of amount of colloidal silica added into the coating solutions was investigated on the photochromic properties of coating films. Both decoloration rate and pencil hardness of the coating films were increased with increasing the amounts of colloidal silica.
Keywords:
Photochromic; Sol-Gel; Organic-Inorganic Hybrid; Spiropyran; Colloidal Silica; Hard Coating Films
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