| 摘要 |
A method for preparing a polyurea is provided. According to an embodiment of the process, a non-aromatic polyfunctional amine having a plurality of primary amino groups is provided. At least one of the primary amino groups is reacted with a non-aromatic reaction rate modifier to provide a secondary amino group having a hydroxyl-containing moiety and the second reactive hydrogen atom appended to the amino nitrogen. The non-aromatic polyfunctional amine having the secondary amino moiety is combined with an aliphatic polyisocyanate into a sprayable composition. Isocyanate groups of the polyisocyanate are reacted with the primary and secondary amino groups to prepare the polyurea. Preferred examples of the reaction rate modifier include alkylene oxides and alkylene carbonates.
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