Starting formulations for UV-cured automotive coatings

- The addition of triallyl isocyanurate can improve mechanical (e.g. scratch resistance) and adhesion properties, as well as chemical stabilities of UV-curing coatings, by increasing the double bond conversion and by modifying the network of the crosslinked matrix. - With increasing UV-protection, the double bond conversion drops. For durable UV-curing coatings an urgent need for crosslinking improving components, which reduce the negative influence of the UV-absorber, exists. - The used UV-protection components and PI additionally affect the constitution of the polymer network, which influences the properties of the resulting UV-cured coatings. - Optimized UV-cured coating formulations were developed, which contain UV-protection components and triallyl isocyanurate crosslinking agent. - If the UV-curing of the clear coat is performed under air atmosphere, triallyl isocyanurate has positive effects on the double bond conversion, the scratch resistance and gloss, but the acid and alkali resistances dropped.