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Surface modification of nanosilica with 3-mercaptopropyl trimethoxysilane and investigation of its effect on the properties of UV curable coatings

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Abstract

This paper describes surface modification of commercial nanosilica with 3-mercaptopropyl trimethoxysilane (MPTMS) and its effect on the properties of UV curable coatings. The mercapto groups were grafted onto nanosilica surface by a condensation of the surface Si–OH with the hydrolysized Si–OH of MPTMS. Fourier transform infrared spectroscopy, thermal gravimetric analysis, and particle size distribution were employed to characterize nanosilica and modified nanosilica. It was demonstrated that the mercapto groups were successfully grafted onto the nanosilica surface with the grafting ratio of 16.8% and the mercapto groups content of 0.9 mmol/g. The dispersion and self-aggregation of nanosilica in UV curable coatings were improved significantly. The photopolymerization kinetics of UV curable coatings, containing various amounts of nanosilica and modified nanosilica, were evaluated by the photo differential scanning calorimetry technique. This indicated that nanosilica both before and after modification decreased UV curing speed and ultimate percentage conversion; however, in comparison with the coatings containing unmodified nanosilica, the coatings containing modified nanosilica exhibited higher curing speeds and conversion ratios. It can be ascribed that the mercapto groups on the nanosilica surface reduced oxygen inhibition during the UV curing process via the thiol–ene click reaction. The mechanical properties of UV curable coatings were also compared.

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Acknowledgments

This study was supported by the Youth Natural Science Foundation of Shanxi Province of China (No. 2010021013-2), Important Specialized Science and Technology Item of Shanxi Province of China (No. 20111101059), and the National Younger Natural Science Foundation of China (No. 21103120), which are gratefully acknowledged.

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Authors and Affiliations

  1. Key Laboratory of Coal Science and Technology, Ministry of Education and Shanxi Province, Taiyuan University of Technology, Taiyuan, 030024, China

    Jianbing Wu & Baojun Wang

  2. College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan, 030024, China

    Junbao Xie

  3. Shanxi Research Institute of Applied Chemistry, Taiyuan, 030027, China

    Jianbing Wu & Guozhang Ma

  4. Research Institute of Special Chemicals, Taiyuan University of Technology, Taiyuan, 030024, China

    Lixia Ling

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  1. Jianbing Wu
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Correspondence to Baojun Wang.

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Wu, J., Xie, J., Ling, L. et al. Surface modification of nanosilica with 3-mercaptopropyl trimethoxysilane and investigation of its effect on the properties of UV curable coatings. J Coat Technol Res 10, 849–857 (2013). https://doi.org/10.1007/s11998-013-9525-z

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