| 摘要 |
The present invention provides a polyurethane compound comprising hydrogenated elastomer with hydroxyl functional groups, elastomer based polyurethane prepolyiner, filler material, and at least one additive selected from the group consisting of antioxidants, rheological modifiers, oils, and carbon black. In an alternate embodiment, the polyurethane compound includes a catalyst. The catalyst may comprise an amine or tin compound. In more specific aspects, this comprises triethanolamin, lauryl dimethyl amine oxide, or tin dibutyl dilaurate. In a more specific aspect, the catalyst typically comprises no greater than about 1% of the compound total weight, and more typically no greater than about 0.5% of the compound total weight. In another embodiment, the hydrogenated elastomer is a telechelic hydrogenated elastomer. In specific embodiments, the hydrogenated elastomer typically comprises from about 20% to about 60% of the compound total weight and, more typically, from about 22% to about 40% of the compound total weight. In another embodiment, the polyurethane prepolymer is polybutadiene-bascd with methylene diphenyl diisocyanate, which confer its elastomeric character. In a specific aspect, the elastomer-based prepolymer includes from about 8.0% by weight to about 14.0% by weight of iso cynanate groups. In a specific embodiment, the polybutadiene-based elastomeric polyurethane prepolymer comprises from about 10% to about 20% of the compound total weight. In yet another embodiment, the filler comprises at least one of sand, talc and/or calcium carbonate. The filler typically has an average particle size of no greater than about 1700 microns, and more typically, no greater than about 500 microns. In a more specific embodiment, the filler comprises a mixture of sand and talc and/or calcium carbonate in a weight ratio of about 0.5 to about 2 of sand to talc and/or calcium carbonate. In an even more specific embodiments, the filler typically comprises from about 40% to about 70% of the compound total weight and, more typically, from about 50% to about 60% of the compound total weight. In another aspect of the invention, the additive typically comprises no greater than about 0.5 weight percent antioxidant, no greater than about 0.2 weight percent carbon black, no greater than about 1.5 weight percent rheological modifier, and/or no greater than about 6 weight percent aliphatic oil. The present invention provides a versatile spreadable polyu rethane compound that may be used, for example, as crack filler, as a coating or covering, for soil retention purposes, or for other geological and/or architectural purposes. Advantages of certain embodiments of the invention include the compound's durability, the ease with which it can be applied, its ability to be modified so its working time and drying/curing time can be adjusted depending on the particular intended end use application, its high resistance to hydrolysis, and its chemical resistance.
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