Abstract
A nano-composite coating was developed by adding nano-SiO 2 to a home-made Waterborne fluorine-containing epoxy resin. The surface hydrophlicity of the coating was investigated by the contact angle with water. As the particle sizes of SiO2 changed from 7-18nm, the water contact angle of the films changed from 62.8° to 85.6°. The surface energy of the coating was calculated out through measuring the contact angles of the coating with water and 1-bromonaphthalene. The presence of SiO2 significantly enhanced the corrosion resistance of the composite coatings, which showed two times than that of the neat waterborne fluorine-containing epoxy coatings. And the thermos dynamic stability of the composite coatings has been significantly improved. When the silica content is 2.0%, the coating has the largest contact angle. Other performance of the coating was investigated in terms of their thickness, flexibility, pencil hardness, impact resistance.
Highlights
Hydrophobic coatings create an attractive interest both in industry and academia due to their unique selfcleaning properties as a result of their water repelling character[1]
The C-F bond is a kind of the strong organic bonds[7].The introduction of fluorinated component to the coating is an effective method to improve water impermeability and reduce surface free energy on the architecture of the molecular structure, which will increase the hydrophobic properties of coatings because of their small dipole and the low polarizability of the C–F bond together with the large free volume[8,9]
The influences of the particle sizes of SiO2 on the water contact angles of coatings are illustrated in Fig 2, with the constant of 1 wt % SiO2 nanoparticles
Summary
Hydrophobic coatings create an attractive interest both in industry and academia due to their unique selfcleaning properties as a result of their water repelling character[1]. The C-F bond is a kind of the strong organic bonds[7].The introduction of fluorinated component to the coating is an effective method to improve water impermeability and reduce surface free energy on the architecture of the molecular structure, which will increase the hydrophobic properties of coatings because of their small dipole and the low polarizability of the C–F bond together with the large free volume[8,9]. Various techniques have been applied to increase the surface roughness, including plasma etching [10,11,12], electrochemical deposition[13,14], chemical vapor deposition[15,16], nanoparticles deposited[17,18], etc. The addition of nanoparticles such as nano-Ti [19], nano-SiO2[20], nano-ZnO[21,22] increase of the corrosion resistance
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