Korean Chemical Engineering Research

The Korean Institute of Chemical Engineers (한국화학공학회)
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Preparation of Water-Repellent Coating Solutions from Tetraethoxysilane and Methyltriethoxysilane by Sol-Gel Method

졸-겔법에 의해 Tetraethoxysilane과 Methyltrimethoxysilane으로부터 발수코팅제 제조

  • Kim, Dong Gu (Department of Biomedical Materials, Konyang University) ;
  • Lee, Byung Wha (Research Institute of Daeheung Chemical Industry Co.) ;
  • Song, Ki Chang (Department of Biomedical Materials, Konyang University)
  • 김동구 (건양대학교 의료신소재학과) ;
  • 이병화 (대흥화학공업(주) 기술연구소) ;
  • 송기창 (건양대학교 의료신소재학과)
  • Received : 2018.04.02
  • Accepted : 2018.05.01
  • Published : 2018.06.01
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Abstract

Water-repellent coating solutions were prepared by sol-gel method using tetraethoxysilane (TEOS) and methyltrimethoxysilane (MTMS) as precursors. The solutions were spin-coated on a cold-rolled steel sheet and thermally cured to prepare a non-fluorine water-repellent coating films. The effects of molar ratios of MTMS/TEOS, water concentration and ammonia concentration on the hydrophobic properties of the coating films were studied. The contact angle of water on coating films prepared by varying the molar ratio of MTMS/TEOS to 1~20 showed a maximum value of $108^{\circ}$ when the MTMS/TEOS molar ratio was 10. With increasing water content, the coating films showed the larger contact angles and the better the water repellency. As the amount of ammonia added was increased, the contact angles of coating films were increased, showing the better the water repellency. It is considered that the larger the amount of ammonia added, the larger the size of the silica particles generated, which increases the surface roughness of the silica particles, thereby increasing the water repellency.

출발물질로서 테트라에톡시실란(TEOS)과 메틸트리메톡시실란(MTMS)을 사용하여 졸-겔법에 의해 발수성 코팅용액을 제조하였다. 이 용액을 냉연강판 위에 스핀 코팅하고 열처리하여 비불소계 발수 코팅 도막을 제조 하였다. 이 과정 중 MTMS/TEOS의 몰 비, 물 농도 및 암모니아 농도가 코팅 도막의 발수성에 미치는 영향을 연구하였다. MTMS/TEOS의 몰 비를 1~20으로 변화시켜 제조 한 코팅 도막의 접촉각은 MTMS/TEOS 몰 비가 10 일 때 최대 수치인 $108^{\circ}$를 나타내었다. 반면에 물의 첨가량을 증가시킴에 따라 코팅 도막의 접촉각이 증가하여 발수성이 향상되었다. 또한 암모니아의 첨가량이 커질수록실리카입자의 크기가커져 실리카입자의표면 거칠기가증가하므로 발수성이 증가하였다.

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References

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