Protect mobile phones: UV-curable hyperbranched urethane acrylate hard coat

In order to effectively protect the plastic housing of 5G mobile phones, a new overspending polyurethane acrylate-based hard coating (HBPUA) with a highly rigid overspending core has been prepared and used as a protective film.
to study the structural and property relationships, two other overspending nuclei (Hyper-6OH) and corresponding HBPUA lymers were synthesized. The structures of Hyper-6OH and HBPUA are indicated by proton MRI and the molecular weight of HBPUA is determined by gel permeation chromatography

. In order to further enhance crosslinking and reduce internal stress, the introduction of triethylol IV (3--based propyl acrylic) (PETMP) into the thin film system. The curing behavior of the prepared HBBPA coating is determined by Fourier Transform Infrared Spectroscopy.
results show that the two-bond transformation is related to the rigidity andof the superspending nuclei. The performance of HBPUA-based films is indicated by testing gel content, solubility and water absorption rates, as well as dynamic mechanical, mechanical, thermal and surface properties.
application of
on protective plastic covers shows that the pencil hardness of the prepared coating reaches 5H, higher than that of the commercially available resin PUA-6, making it possible to apply in the protective plastic housing. The rigidity of the overspending nuclei and the introduction of PETMP significantly affect the Tg value of the film, and the addition of thiol-based increases gel content, solubility, toughness and coating adhesion, but reduces water absorption and stretch strength. In addition, all coatings exhibit good thermal properties.
the study was published in July 2020 in volume 144 of Organic Coatings Progress.
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