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http://dx.doi.org/10.9713/kcer.2019.57.2.177

Preparation of Non-Fluorinated Water Repellent Coating Films Using Methyltrimethoxysilane and Trimethylethoxysilane  

Kim, Dong Gu (Department of Biomedical Materials, Konyang University,)
Lee, Byoung Hwa (Research Institute of Daeheung Chemical Industry Co.)
Song, Ki Chang (Department of Biomedical Materials, Konyang University,)
Publication Information
Korean Chemical Engineering Research / v.57, no.2, 2019 , pp. 177-184 More about this Journal
Abstract
Non-fluorinated water repellent coating solutions were obtained using methyltrimethoxysilane (MTMS) and trimethylethoxysilane (TMES) as precursors. The solutions were spin-coated on a cold-rolled steel sheet and cured thermally to prepare water repellent coating films. During this process, the effect of molar ratio of TMES/MTMS was studied for the hydrophobic properties of the coating films. Hydrophobic properties of coating films were characterized using contact angle measurement, surface morphology analysis and infrared spectroscopy. When the molar ratio of TMES/MTMS was varied from 0 to 30, the contact angle of the un-coated cold-rolled steel sheet was $30^{\circ}$, whereas when the molar ratio of TMES/MTMS was 1, the contact angle increased to $104^{\circ}$ and water repellency was significantly improved. In the case of TMES/MTMS molar ratios of 10, 15, 25 and 30, the contact angles of coating films showed $109^{\circ}$, $114^{\circ}$, $117^{\circ}$ and $144^{\circ}$, respectively. At this time, the hydrophobicity of the coating films was improved by the increase of the surface roughness and the content of the methyl component at the coating surface. In particular, when the molar ratio of TMES/MTMS was 30, the overall surface roughness was greatly increased due to the presence of surface particles as well as the water repellency due to methyl groups of TMES, resulting in super hydrophobicity of $144^{\circ}$.
Keywords
Methyltrimethoxysilane; Trimethylethoxysilane; Non-florinated; Water repellent; Coating films; Contact angle; Cold-rolled steel sheet;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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