β Scribed by Visay Viengkhou; Loo-Teck Ng; John L. Garnett
No coin nor oath required. For personal study only.
An epoxy resin-coating formulation was prepared from diacrylated epoxy bispheno1-Aepichlorohydrin and a reactive monomer, tripropyleneglycol diacrylate. The additives, silane and fluorochemicals, were included in the formulation to evaluate their effects on the UV curing of the epoxy resin onto timber. Thin films coated on wood substrates were cured under UV radiation in the presence of the photoinitiator, benzoin ethyl ether. Adhesion of the cured films onto wood substrates was evaluated using the cross-cut and the pull-off tests. Film hardness was evaluated using the pencil hardness and the pendulum hardness tests. Water repellency of the films were measured from contact angles using a telegoniometer. Scanning electron microscopy (SEM) was used to investigate the interface between the films and the wood substrates. These studies showed that silane only enhanced the adhesion of the film onto the wood substrates but had no effect on the hardness of the films. The additives improved the water repellency of the films with the fluorochemicals, exhibiting dramatic improvement. SEM revealed that only the fluorochemical aided the penetration of the resin into the wood.
π SIMILAR VOLUMES
UV-curable waterborne unsaturated polyesters for wood coatings were prepared. The effects of different polyols and acids on the properties of the UV-curable waterborne unsaturated polyesters were investigated. Several different unsaturated polyester prepolymers were prepared from three different pol