| 摘要 |
Composite materials and methods for their preparation are described herein. The composite materials include a polyurethane made from the reaction of an isocyanate and a mixture of polyols, and coal ash (e.g., fly ash). The mixture of polyols comprises at least two polyols including a high hydroxyl number polyol having a hydroxyl number greater than 250 and comprising from about 1% to about 25% by weight of the total polyol content used to form the polyurethane, and a low hydroxyl number polyol having a hydroxyl number of 250 or lower. The coal ash is present in amounts from about 40% to about 90% by weight of the composite material. Also described is a method of preparing a composite material, including mixing an isocyanate, a mixture of at least two polyols, coal ash (e.g., fly ash), and a catalyst.
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