Processes for coating substrates and substrates formed therefrom

摘要

Processes for coating substrates and the related substrates are disclosed herein. A one-component base coating composition is applied onto a substrate and a one-component top coating composition is applied wet-on-wet onto the applied base coating composition. The coating compositions are based on aqueous acrylate/polyurethane dispersions. The top coating composition is applied after the applied base coating composition develops a pendulum hardness of at least 50% of the pendulum hardness that would be exhibited by the base coating composition after UV cure. The applied coatings exposed to UV radiation to simultaneously cure both the base coating composition and the top coating composition.

主权项

1. A process for coating a substrate, comprising:
applying a one-component waterborne base coating composition onto a substrate, the base coating composition comprising a first aqueous epoxy acrylate/polyurethane dispersion; applying a one-component waterborne top coating composition wet-on-wet onto the applied base coating composition after the applied base coating composition develops a pendulum hardness of at least 50% of a pendulum hardness that would be exhibited by the base coating composition after UV cure, the top coating composition comprising a mixture of a second aqueous epoxy acrylate/polyurethane dispersion and an aqueous polyester acrylate/polyurethane dispersion; and exposing the applied coating compositions to UV radiation to simultaneously cure both the base coating composition and the top coating composition; wherein the first aqueous epoxy aqueous acrylate/polyurethane dispersion may be the same or different than the second aqueous epoxy acrylate/polyurethane dispersion.