| 摘要 |
The present invention provides novel prepolymers comprising a blend of a toluene diisocyanate prepolymer, formed from a toluene diisocyanate and a polyol, and a diphenylmethane diisocyanate or a diphenylmethane diisocyanate quasi-prepolymer. The present invention also provides polyurea elastomers comprising the novel prepolymer blends reacted with an amine-terminated chain extender or cross-linker to form the polyurea elastomer. The present invention further provides methods for preparing the novel prepolymers and the polyurea elastomers. The novel polyurea elastomers have improved modulus, tensile properties, adhesion, and surface characteristics and may be applied by spraying, troweling, casting, or caulking.
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