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• Li, X
• Nikiforow, I
• Pohl, K
• Adams, J
• Johannsmann, D
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• Li, X
• Nikiforow, I
• Pohl, K
• Adams, J
• Johannsmann, D
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• Nikiforow, I
• Pohl, K
• Adams, J
• Johannsmann, D

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Coatings 2013, 3(1), 16-25; doi:10.3390/coatings3010016

Article

Polyurethane Coatings Reinforced by Halloysite Nanotubes

Xin Li, Irina Nikiforow, Katja Pohl, Jörg Adams and Diethelm Johannsmann*

Institute of Physical Chemistry, Clausthal University of Technology, 38678 Clausthal-Zellerfeld, Germany

* Author to whom correspondence should be addressed.

Received: 18 December 2012; in revised form: 10 January 2013 / Accepted: 15 January 2013 / Published: 18 January 2013

Download PDF Full-Text [1036 KB, uploaded 18 January 2013 08:48 CET]

Abstract: The pencil hardness of a two-component polyurethane coating was improved by adding halloysite nanotubes to the recipe at a weight fraction of less than 10%. The pencil hardness was around F for the unfilled coating and increased to around 2H upon filling. It was important to silanize the surface of the filler in order to achieve good coupling to the matrix. Sonicating the sample during drying also improved the hardness. Scanning electron micrographs suggest that the nanotubes are always well immersed into the bulk of the film. With a thickness between 10 and 20 µm, the optical clarity was good enough to clearly read letters through the film. The films can be used in applications where transparency is required.

Keywords: polyurethane coatings; halloysite nanotubes; scratch resistance

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