Polydimethylsiloxanes with VinyL Ether End-Groups as Folymerisable Surface Active Additives for UV-Cured Coatings

摘要

Telechelic polydimethylsiloxanes (PDMS) were modified by divinyl ethers to yield reactiv surfactants that can be polymerised together with conventional monomers by cationic photopolymerisation. A series of these tailor-made functional polymers was incorporated into epoxide/vinyl ether formulations. PDMS additives effectively improved the wetting properties o these formulations coated onto various substrates. Contact angle measurements showed a significant reduction of the surface energy for cured coatings containing the silicone additive. The presence o the reactive PDMS (0.25 ― 5 wt-%) was also shown to impart stain-resistance properties. Long-term anti-graffiti effects were studied in comparison with reference formulations. An ESCA study revealed the high silicone density in the top layer of the coaling.