Study on releasing properties and surface group migration of UV-curable silicone modified polyurethane releasing agent

UV-cured releasing agent is a new type of anti-fouling coatings, which must meet needs of the development in the pressure-sensitive adhesive industry, but also in line with modern environmentally friendly demands. With a step-by-step method, a multi-functional photosensitive silicone modified polyurethane releasing agent was synthesized using a hydroxyalkylsiloxane, toluene diisocyanate, and pentaerythritol triacrylate, carrying out by UV initiating technique to prepare the releasing films. The infrared spectrum and the nuclear magnetic resonance spectrum were used to analyze a molecular structure of the releasing agent. Peel strength tests and morphological tests were used to characterize the application capabilities of the releasing films. X-ray photoelectron spectroscopy and other techniques were simulated the migration of the surface group of the releasing films during the pressure sensitive adhesive adherence. The results showed that the excessive soft segment silicone chain reduced crosslink density, thereby reducing the residual performance, while the excessive polar group density would simultaneously reduce the releasing performance and residual performance. This conclusion reveals the releasing mechanism of the UV-cured releasing agent, and provides an important guiding significance for the molecular design and product development of the new type of releasing agent.