Bayer MaterialScience brings innovative polymer coating solutions to the automotive market, proposes a new key technology for “back coatingâ€, and recently developed a successful double-cure coating, which is expected to greatly save investment in coating lines. cost. Leverkusen, Germany, Bayer MaterialScience brings innovative polymer coating solutions to the automotive market, proposes a new key technology for “back coatingâ€, and recently developed a successful double-cure coating. Significant savings in investment costs in coating lines. It is reported that such coatings are directly made of soft film technology, and the body part adopts a hard coating that can withstand harsh weather and washing during the life of the vehicle. First, a partially cured primer and varnish is applied to the film to give the film sufficient flexibility in subsequent thermoforming, while the primer remains smooth and free of cracks; then the coating is cured by UV radiation. This important innovation is called “back coatingâ€. The thermoformed film can be reinforced by thermoplastic injection molding or polyurethane reactive injection molding (RIM), which is more economical, faster and less likely to be flawed. In addition, the “in-mold coating†project is also in the development stage. This innovative “two-step†technology can bring high-quality primers that traditional coating methods cannot provide: first, plastic parts are produced by RIM or injection molding, the second step The reaction two-component polyurethane is injected into the closed mold to be rapidly solidified therein. This allows mold parts to quickly coat functional coatings or decorative primers, replacing relatively complex spray applications.