Tetraethoxysilane과 Chlorotrimethylsilane으로부터 PMMA 기재 위에 발수성 코팅 도막 제조

박종호; 이병화; 송기창; Jong Ho Park; Byung Wha Lee; Ki Chang Song

Korean Chemical Engineering Research, Vol.57, No.1, 124-132, February, 2019

DOI10.9713/kcer.2019.57.1.124 Export Citation

Tetraethoxysilane과 Chlorotrimethylsilane으로부터 PMMA 기재 위에 발수성 코팅 도막 제조

Preparation of Water-Repellent Coating Films from Tetraethoxysilane and Chlorotrimethylsilane on PMMA Substrates

박종호, 이병화¹, 송기창^†

건양대학교 의료신소재학과, 35365 대전광역시 서구 관저동로 158
¹대흥화학공업(주) 기술연구소, 17746 경기도 평택시 산단로 64번길 68

Jong Ho Park, Byung Wha Lee¹, and Ki Chang Song^†

Department of Biomedical Materials, Konyang University, 158 Gwanjeodong-ro, Seog-u, Daejeon, 35365, Korea
¹Research Institute of Daeheung Chemical Industry Co., 68, Sandan-ro 64beon-gil, Pyeongtaek-si, Gyeonggi-do, 17746, Korea

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초록

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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[1] Bakhshi M, Ozeiri M, Sharif A, Aalaie J, Korean J. Chem. Eng., 34(3), 903 (2017)

[2] Kim DG, Lee BW, Song KC, Korean J. Chem. Eng., 56(3), 327 (2018)

[3] Kim TK, Kang HJ, Park JH, Textile Coloration and Finishing, 29(2), 55 (2017)

[4] Jeevajothi K, Subasri R, Raju KRCS, Ceram. Int., 39, 2111 (2013)

[5] Yang H, Pi PH, Cai ZQ, Wen XF, Wang XB, Cheng J, Yang ZR, Appl. Surf. Sci., 256(13), 4095 (2010)

[6] Kuo CFJ, Chen JB, Shih CY, Huang CY, J. Appl. Polym. Sci., 131(1), 40317 (2014)

[7] ASTM D 3359, “Standard Test Methods for Measuring Adhesion by Tape Test,” ASTM International, 927-929(1997).