1993 Volume 79 Issue 11 Pages 1278-1283
Poly (vinyl chloride) (PVC) paints containing electron beam (EB) sensitive monomers were coated on steel sheets and baked and cross-linked by EB subsequently. Increase of film hardness for the EB cross-linked PVC coated steel sheets was investigated by the use of various monomers. As the amounts of monomer in film increased, the film hardness increased. In case of smaller equivalent of double bonds of monomer, higher film hardness value was obtained with smaller portions of monomer. Property balance between the film hardness and the bend formability depended upon kinds of monomers, and as the difference of solubility parameter for monomer from that of plasticizer decreased, the property balance improved. EB cross-linked PVC coated steel sheet containing 50phr trimethyol propane trimethacrylate (TMPTMA) had pencil hardness F and OT bend formability. From dynamic viscoelasticity of EB cross-linked PVC film, it is assumed that plasticized PVC and TMPTMA were in miscibility, and rigidity of film was obtained by the dense bridging PVC by TMPTMA.
