Filled polyurethane composites and methods of making same

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.

主权项

1. A rigid composite material comprising:
a polyurethane formed by the reaction of an isocyanate selected from the group consisting of diisocyanates, polyisocyanates and mixtures thereof, and at least two polyols, the at least two polyols comprising: a high hydroxyl number polyol selected from the group consisting of polyether polyols and polyester polyols, the high hydroxyl number polyol having a hydroxyl number greater than 250 and having 75% or greater primary hydroxyl groups, wherein the high hydroxyl number polyol includes an aromatic polyester polyol and wherein the high hydroxyl number polyol comprises from about 1% to about 25% by weight of the total polyol content used to form the polyurethane, and a low hydroxyl number polyol selected from the group consisting of polyether polyols and polyester polyols, the low hydroxyl number polyol having a hydroxyl number of 250 or lower; and from about 40% to about 90% by weight coal ash, wherein the composite material has a density of 5 lb/ft3 or greater.