Synthesis of UV-curing waterborne polyurethane-acrylate coating

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Recently scientists synthesised UV-curing waterborne polyurethane-acrylate coating and its photopolymerisation kinetics by using FT-IR and photo-DSC methods.

Environmentally friendly waterborne polyurethane-acrylate (WPUA) oligomers and ultraviolet curing WPUA films (UV-WPUA) were prepared. The thermal stability, solvent-resistance and mechanical properties of the films were investigated. FT-IR and photo-DSC methods were used to investigate the photopolymerisation kinetics of the UV-WPUA films.

Providing a theoretical guidance

The results showed that UV-curing films offered the optimum combination of properties when the polyether polyol (NJ-330), isophorone diisocyanate (IPDI), hydroxyethyl methyl acrylate (HEMA) and dimethylolbutanoic acid (DMBA) were used as the raw materials and the mass ratio of oligomer: monomer butyl acrylate (BA): photoinitiator was fixed at 66:30:4. Reaction kinetics of different photoinitiators systems were calculated by Kissinger equation and Crane equation, thus providing a theoretical guidance for the optimisation of diluent and photoinitiator in UV-curing coating industry.

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