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Preparation of hyperbranched polyurethane acrylates and their properties in UV curable nano-SiO2 composite coatings for PET optical film

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Abstract

Polyethylene terephthalate (PET) films have been widely applied in the display industry. However, there is a problem in effectively protecting and extending the service life. To address this issue, a hyperbranched polyurethane acrylate (HPUA) has been synthesized with poly (hexylene glycol) neopentyl glycol ester (PNA), isophorone diisocyanate (IPDI), hyperbranched polyol Boltorn™H2004 and pentaerythritol triacrylate (PETA). Further, a series of high-performance UV curable coatings have been prepared with HPUA, hollow nano-SiO2 and silane coupling agents, along with other reagents. The structure of HPUA has been characterized by infrared spectroscopy (FT-IR), and the curing process has been monitored kinetically by real-time infrared spectroscopy to study its double-bond conversion ratio. The properties of the cured films have been investigated by thermogravimetric analysis (TGA). The water contact angle, aging and yellowing resistance, hardness, flexibility, abrasion resistance, light transmittance, and adhesion of the cured coatings on PET film have been tested. The results have shown that the addition of hollow nano-SiO2 and silane coupling agents has not only not affect the light transmittance of the coatings but also improved the surface properties and heat resistance. When the silane coupling agent has been γ-Methacryloxypropyltrimethoxysilane (KH-570), the water contact angle of the coating has been 101.8°, excellent resistance to aging and yellowing, and the hardness, flexibility, and abrasion resistance have reached 89.4 HD, 3 mm, and 500 g/350 times, respectively. It was worth mentioning that the cured coating has shown excellent adhesion to PET film with the best overall performance. This work has offered important guidance for the protection of PET films.

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Acknowledgements

We gratefully acknowledge financial support from the Natural Science Foundation of Shanxi Province (No. 20210302123094).

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Authors and Affiliations

  1. College of Chemical Engineering and Technology, Taiyuan University of Technology, No. 79 West Yingze Street, Taiyuan, 030024, Shanxi, People’s Republic of China

    Kexin Zheng, Lixia Ling & Baojun Wang

  2. Ningbo Yongan Optical New Material Technology Co., Ltd., Ningbo, 315000, Zhejiang, People’s Republic of China

    Jianbing Wu

  3. State Key Laboratory of Clean and Efficient Coal Utilization, Taiyuan University of Technology, Taiyuan, 030024, Shanxi, People’s Republic of China

    Baojun Wang

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  1. Kexin Zheng
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  2. Lixia Ling
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Contributions

Kexin Zheng: Investigation, experiment, data curation, writing, modification. Lixia Ling: Supervision, funding acquisition, review & editing. Jianbing Wu: Supervision, funding acquisition, review & editing. Baojun Wang: Funding acquisition.

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Correspondence to Lixia Ling.

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Zheng, K., Ling, L., Wu, J. et al. Preparation of hyperbranched polyurethane acrylates and their properties in UV curable nano-SiO2 composite coatings for PET optical film. J Polym Res 31, 70 (2024). https://doi.org/10.1007/s10965-024-03922-8

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  • DOI: https://doi.org/10.1007/s10965-024-03922-8

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