An isocyanate group-containing hot melt urethane prepolymer, a morpholine ether-based crosslinking catalyst, and at least one sulfur atom-containing organic acid selected from the group consisting of sulfonic acids and sulfinic acids are used as essential components. The urethane prepolymer is a compound having an isocyanate group capable of reacting with moisture in the air or a substrate to be coated to form a crosslinked structure in the molecule. The morpholine ether-based crosslinking catalyst contributes to the moisture-crosslinking reactivity at room temperature. The sulfur atom-containing organic acid contributes to an improvement in thermal stability during melting.
一种含
异氰酸酯基的热熔聚
氨酯预聚物、一种吗啉醚基交联催化剂和至少一种从
磺酸和
亚硫酸组成的组中选出的含
硫原子的有机酸被用作基本成分。聚
氨酯预聚物是一种具有
异氰酸酯基团的化合物,能与空气中的
水分或待涂覆的基材发生反应,在分子中形成交联结构。以吗啉醚为基础的交联催化剂有助于在室温下进行湿气交联反应。含
硫原子的有机酸有助于提高熔化过程中的热稳定性。