A curable aqueous polyurethane dispersion substantially comprises
a) at least one compound having two free isocyanate groups, at least one allophanate group and at least one C═C double bond capable of free radical polymerization, a carbonyl group or an oxygen atom in the form of an ether function being bonded directly to the double bond,
b) at least one compound having at least one group reactive toward isocyanate groups and having a C═C double bond capable of free-radical polymerization,
c) if required, at least one compound having at least two groups reactive towards isocyanate groups and selected from hydroxyl, mercapto, primary and/or secondary amino groups,
d) at least one compound having at least one group reactive towards isocyanate groups and having at least one acid group,
e) at least one basic compound for neutralizing or partially neutralizing the acid groups of the compounds d),
and a thermal initiator and is used for coating substrates.
一种可固化的
水性聚
氨酯分散体主要包括
a) 至少一种化合物,该化合物具有两个游离
异氰酸酯基团、至少一个
异氰酸酯基团和至少一个能进行自由基聚合的 C═C 双键,一个羰基或一个醚官能团形式的
氧原子直接键合到双键上、
b) 至少一种化合物,其至少一个基团对
异氰酸酯基团有反应性,并具有一个能进行自由基聚合的 C═C 双键、
c) 至少一种化合物,其至少有两个基团对
异氰酸酯基团有反应性,且选自羟基、巯基、 伯
氨基和/或仲
氨基、
d) 至少一种化合物,其至少一个基团对
异氰酸酯基团起反应,并具有至少一个酸基、
e) 至少一种碱性化合物,用于中和或部分中和 d) 化合物的酸性基团、
和一种热
引发剂,用于涂覆基材。