An Improvement of Cationic UV Curing
Rong Bao, Tronly New Electronic Materials Cooperation
Abstract:Cationic UV curing has a lot of advantage over free radical UV curing in many industry applications, such as coating on metal, glass, plastics UV adhesive and 3D UV printing. However, increasing cation UV curing speed and conversion has been a great challenge for many UV formulators and chemists. In our work, we used oxetane monomer(MOX104) to copolymerizing with different kinds of epoxy monomers in cationic photopolymerization to increase the conversion and the rate of photopolymerization of epoxy monomers, especially the diglycidylether of bisphenol A epoxy resin (DGEBA). In order to adjust the properties of the polymer, different initiator concentrations, co-monomers were applied. The result showed that the conversion of MOX104 was improved significantly by adding a certain amount of 3,4-epoxycyclohexane carboxylate or diglycidylether of bisphenol A epoxy resin. Moreover, the glass transition temperature, decomposition temperature and Young`s modulus of poly (MOX104) were improved by adding different amount of diglycidylether of bisphenol A epoxy resin. Our results can increase cationic UV curing speed 2-3 times, which will speed up 3D curing process. A summary table of physical property difference from different ratio of Oxtane and Oxriane will be presented. Conversion of Oxtane and Oxriane will be compared.