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Polymers 2018, 10(8), 906; https://doi.org/10.3390/polym10080906

Polyurethane/Red Mud Composites with Flexibility, Stretchability, and Flame Retardancy for Grouting

1
Institute of Materials Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China
2
School of Energy and Engineering, Henan Polytechnic University, Jiaozuo 454000, China
*
Authors to whom correspondence should be addressed.
Received: 8 July 2018 / Revised: 8 August 2018 / Accepted: 9 August 2018 / Published: 12 August 2018
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Abstract

Flexibility, stretchability, and flame retardancy are of ever increasing importance in constructing grouting materials. Herein, a simple and effective strategy to make organic-inorganic composite grouting material in a “flexible, stretchable, and flame retardant” way was based on the excellent synergistic interactions among polyurethane prepolymer, red mud, polyethylene glycol, and trimethylolpropane. The resultant polyurethane/red mud composite grouting material with three-dimensional network structure presented a favorable flexibility, desirable compressive strength of 29.2 MPa at 50% compression state, and a good elongation at 15.1%. The grouting material was mainly composed of amorphous polyurethane and crystalline red mud, and its probable formation mechanism was reaction of prepolymer with H2O, polyethylene glycol and trimethylolpropane under vigorous stirring in the presence of catalyst. Furthermore, the grouting material possessed favorable thermal stability, flame retardancy and repairment performance for roadway cracks. This work may open a simple and convenient avenue for the massive engineering application of red mud and preparation of flexible organic-inorganic hybrid grouting material. View Full-Text
Keywords: grouting material; polyurethane; red mud; flexibility; stretchability grouting material; polyurethane; red mud; flexibility; stretchability
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Zhang, C.; Shuai, B.; Zhang, X.; Hu, X.; Zhang, H.; Jia, Y.; Yang, Z.; Guan, X. Polyurethane/Red Mud Composites with Flexibility, Stretchability, and Flame Retardancy for Grouting. Polymers 2018, 10, 906.

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