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Issue
Korean Chemical Engineering Research,
Vol.57, No.1, 124-132, 2019
Tetraethoxysilane과 Chlorotrimethylsilane으로부터 PMMA 기재 위에 발수성 코팅 도막 제조
Preparation of Water-Repellent Coating Films from Tetraethoxysilane and Chlorotrimethylsilane on PMMA Substrates
박종호, 이병화, 송기창
출발물질로서 TEOS (tetraethoxysilane)와 CTMS (chlorotrimethylsilane)를 사용하여 물과의 가수분해 및 중축합 반응에 의해 발수 코팅 용액을 합성하였다. 또한 이 용액을 PMMA 시트 위에 도포하고 열처리하여 비불소계 발수 코팅도막을 제조하였다. 코팅 도막은 수접촉각, UV-Vis 투과율 및 미세구조 관찰에 의해 분석되었다. CTMS/TEOS의 몰비를 0.6~1.0으로 변화시켜 제조 된 코팅 도막은 CTMS/TEOS의 몰 비가 0.8일 때 107o의 최대 접촉각을 나타내었다. 또한 코팅 도막은 CTMS/TEOS의 몰 비가 0.6~0.8일 때 90%의 높은 가시광선 투과율을 보였다. 그러나 CTMS/TEOS의 몰 비가 0.9~1.0인 경우에는 거친 표면의 불균일한 형상으로 인해 코팅 도막은 70% 이하의 낮은 투과율을 보였다.
Water-repellent coating solutions were synthesized by hydrolysis and polycondensation reactions with water using tetraethoxysilane (TEOS) and chlorotrimethylsilane (CTMS) as precursors. The solutions were coated on a PMMA sheet and thermally cured to prepare non-fluorinated water-repellent coating films. Coating films were characterized by water contact angles, UV-Vis transmittance and surface morphology. The contact angle of coating films prepared by varying the molar ratio of CTMS/TEOS to 0.6~1.0 exhibited a maximum value of 107o when the CTMS/TEOS molar ratio was 0.8. The coating films showed a high transmittance over the visible range up to 90% when the CTMS/ TEOS molar ratios were 0.6~0.8. However, when the molar ratios of CTMS/TEOS were 0.9~1.0, the transmittance of coating films was lower than 70% due to an uneven shape of the rough surface.
Keywords: Water-repellent coating solutions; Tetraethoxysilane; Chlorotrimethylsilane; PMMA sheet; Non-fluorinated; Contact angles
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