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Wednesday, 18 September 2019
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Raw materials & technologies

Polyurethane clearcoats show antigraffiti properties

Thursday, 18 July 2013

Chinese researchers from Southeast University in Nanjing have prepared and characterised polyurethane clearcoats in terms of their antigraffiti properties.

Polyurethane clearcoats protect against graffiti  

Source: Fotolia

Polyurethane clearcoats protect against graffiti  

Source: Fotolia

The researchers first synthesised polymethylsiloxane grafted by fluorocarbon side chains (PSF) through hydrosilylation of polymethylhydrosiloxane with dodecafluoroheptyl acrylate. Hydroxyl fluoroacrylate resins with different hydroxyl contents were synthesised via free radical-initiated solution polymerisation and further applied to prepare polyurethane clearcoats.

Analytical characterisations

The synthesised polymers were structurally characterised by using Fourier Transform Infrared (FT-IR) and Nuclear Magnetic Resonance (H NMR). The prepared polyurethane clearcoats underwent contact angle measurement, dynamic thermal mechanical analysis, nanoscratch experiments and atomic force microscopy.

High resistance to acrylic spray paint, permanent markers and further graffiti materials

The results reveal that low surface energy, high crosslink density, low coefficient of friction and low roughness were jointly beneficial to antigraffiti properties. Antigraffiti testing was carried out on the clearcoat with 8.0 wt % PSF and 2.0 wt % active silicone fluid and this clearcoat showed high resistance towards acrylic spray paint, permanent markers and other graffiti materials.

This study appeared in: Journal of Coatings Technology and Research, 2013, DOI 10.1007/s11998-013-9507-1.

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