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

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.

Improving the flame retardancy and mechanical properties of epoxy composites using flame retardants with red mud waste

“…Moreover, in these tests flame retardant properties of RM are also is obvious as reported in some studies. Zhang et al 51 verified by combustion test that polyurethane/RM composite had better fire‐resistant performance than neat polyurethane. In another study, the heat release rate of ethylene vinyl acetate copolymer decreased by 72.9% due to addition 50 wt% of RM 52 .…”

Sustainable and greener coatings produced from accelerator‐ and sulfur‐free polyurethane dispersion/carboxylated nitrile butadiene latex blends

“…This denoted that as the content of the XNBR in the blending ratio increased, the C O bond would gradually decrease due to the reduction of the content of PU in the blending formulation. 45 The existence of the urethane functional group in all samples was best 45,46,57,58 Furthermore, except for pure PUD, PUD/XNBR blends have peaks at $2236-2237 cm À1 and 968-971 cm À1 . These respective bands are found to be becoming sharper as more XNBR is blended into the compound.…”

The Influence of Fly Ash on the Foaming Behavior and Flame Retardancy of Polyurethane Grouting Materials

“…Inorganic filler modification is an important strategy to improve performance and reduce the cost of PU grouting materials. Inorganic substances such as nano-silicon, water glass, red mud, and cement are often used to prepare PU-based organic-inorganic composites [ 8 , 12 , 13 , 14 ].…”