| 摘要 |
The present invention describes a one-part moisture-curing liquid-applied waterproofing membrane including a polyurethane polymer and both an aldimine and an oxazolidine as blocked amine hardeners in a specific ratio range. The membrane has a low odor, a long shelf life stability, a low viscosity at low solvent content, a sufficiently long open time to allow hand application and cures fast to a solid elastic material. The liquid-applied waterproofing membrane can be suitable for roofing applications, possessing high strength, high elongation and good durability under outdoor weathering conditions in a broad temperature range. |
| 主权项 |
1. A one-part moisture-curing liquid-applied waterproofing membrane comprising:
at least one isocyanate-functional polyurethane polymer; at least one aldimine of the formula (I), whereinA is an n-valent hydrocarbyl moiety of molecular weight in the range of 28 to 5000 g/mol optionally containing ether or urethane groups,R1 and R2 are the same or different C1 to C12 linear or branched alkyls, or are joined together to form a divalent linear or branched C4 to C12 hydrocarbyl moiety which is part of a 5- to 8-membered carbocyclic ring,R3 is hydrogen or a linear or branched C1 to C12 alkyl or arylalkyl or alkoxycarbonyl,R4 is a monovalent C6 to C20 hydrocarbyl moiety optionally containing ether, carbonyl or ester groups, andn is from 2 to 6; at least one oxazolidine of the formula (II), whereinB is a m-valent hydrocarbyl moiety of molecular weight in the range of 28 to 2000 g/mol optionally containing ether, ester, amide, carbonate, urethane or urea groups,R5 and R6 are independently selected from hydrogen or C1 to C12 linear or branched alkyl, andm is 2 or 3;whereby the ratio between the number of aldimino groups and the number of oxazolidino groups is in the range of 80/20 to 20/80. |
