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Polyurethane latent catalysts obtained by emulsion solvent evaporation

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Abstract

Many efforts have been made to develop catalysts for polyurethanes (PUs) due to their significant roles in the manufacturing process. However, it is still a long-standing technical issue to manipulate the catalytic activity and enhance the storage stability of PU precursors by using suitable catalyst. In this work, a new microcapsule thermolatent catalyst was prepared by emulsion solvent evaporation (ESE) method with a dibutyltin dilaurate (DBTDL) core and a polymeric shell. The glass transition temperature (Tg) of polymeric shell was utilized as threshold temperature. By changing the composition of acrylate copolymers, the glass transition temperature of polymeric shell could be controlled, which further moderated the latency and catalytic activity of ESE microcapsule catalysts. Compared to DBTDL, all ESE microcapsule catalysts showed certain latency at 30 °C. The catalytic activity of ESE microcapsules was rapidly increased at 70 °C. In the ESE microcapsule catalysts, ESE1 sample exhibited excellent performance due to the suitable Tg and uniform morphology. Compared to phenyl mercury neodecanoate and DBU, which are traditional thermolatent catalysts, ESE1 sample showed more excellent latency and catalytic activity.

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Acknowledgements

This research work was supported by the Dow Chemical Co. funding. Thanks to Yang Gao, Gang Wang and Mengyu Chen for their kind support to this work.

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Authors and Affiliations

  1. State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, Fudan University, Shanghai, 200433, China

    Licheng Liu, Haijun Dong & Yingfeng Yu

  2. Dow Chemical Company, No. 936, Zhangheng Road, Pudong New Area, Shanghai, 201203, China

    Zhengming Tang, Chenyan Bai, Yanli Feng & Hongyu Chen

  3. The Dow Chemical Company, Bachtobelstrasse 3, Horgen, 8810, Zurich, Switzerland

    Thorsten Schmidt

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  1. Licheng Liu
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Liu, L., Dong, H., Yu, Y. et al. Polyurethane latent catalysts obtained by emulsion solvent evaporation. Polym. Bull. 80, 3377–3393 (2023). https://doi.org/10.1007/s00289-022-04225-y

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