Study on high-solid content Si/PU polyurethane dispersion with PES/PPG composite soft segment

Authors

  • Faxing Zhang,

    1. Department of Chemical Engineering and Environment, North University of China, Taiyuan 030051, People's Republic of China
    2. Department of Material and Chemical Engineering, Sichuan Institute of Technology, Zigong Sichuan 643000, People's Republic of China
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  • Xiaoli Wei,

    Corresponding author
    1. Department of Material and Chemical Engineering, Sichuan Institute of Technology, Zigong Sichuan 643000, People's Republic of China
    • Department of Material and Chemical Engineering, Sichuan Institute of Technology, Zigong Sichuan 643000, People's Republic of China
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  • Zhongliang Xiao

    1. Department of Chemical Engineering and Environment, North University of China, Taiyuan 030051, People's Republic of China
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Abstract

A polyol consists of silicone chains and epoxy acrylate structures, referred to as silicon polyether (PES), was used to prepare crosslinked Si/PU dispersions. Both PES and propylene oxide glycol (PPG) were mixed as soft segments. The effects weight ratios of PES to PPG on properties of the resultant polyurethane dispersions were studied. Morphology and properties of the Si/PU dispersions were characterized by particle size, transmission electron microscopy (TEM), and viscometer. It is shown that the Si/PU dispersions possessed wider particle size distribution and higher average particles diameter because of the use of PES, which contains crosslinked silicone side chains. The Si/PU dispersions have higher solid content as compared to the conventional water-based polyurethane, because of the volume fraction ratio of bigger particle to small particle from the Si/PU dispersions. As increasing weight ratio of PES to PPG, the solid content of the Si/PU dispersions increased firstly, and then decreased. When the ratio ranges from 4 : 10 to 5 : 10, solid content of the Si/PU dispersions is up to 55%. It was also noticed that apparent viscosity of the Si/PU dispersions decreased with increasing PES to PPG ratio. In the Si/PU dispersions, solid content was increased and viscosity was decreased by the use of PES. Therefore, PES is a potential compound for the application of PU dispersions. In addition, stability of the crosslinked Si/PU dispersions decreases slightly at high- and low-temperature; however, which can meet the basical requirements. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013

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