Polymeric prepolymer is an important component that determines the performance of UV varnish coating. It is the most basic component of UV ink and film-forming material. Its performance plays an important role in the curing process and the properties of cured ink film. It is generally classified according to the skeleton structure. The skeleton structure affects the hardness, friction resistance, adhesion, light resistance, chemical resistance and water resistance of the coating.
Structurally, oligomers are low molecular resins containing "C = C" unsaturated double bonds, such as acrylic acyl, methacryloyl, vinyl, allyl, etc. There are mainly epoxy acrylate resin, polyurethane acrylate resin, polyester acrylate resin, polyether acrylic resin, propyl polyacrylate, unsaturated polyester resin and other resin types. Under the same conditions, the light curing speed of acryloyl group is the fastest, so most oligomers are acrylic resin.
