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2. 发明授权

US4801631A Aqueous glue dispersions containing polyisocyanates, their preparation and use 失效
标题翻译：含有多异氰酸酯的水性胶体分散体，其制备和用途
公开(公告)号：US4801631A
公开(公告)日：1989-01-31
申请号：US11648
申请日：1987-02-06
申请人： Hanns I. Sachs , Donald R. Larimer
发明人： Hanns I. Sachs , Donald R. Larimer
IPC分类号： C08G18/64 , C08G18/70 , C08L97/02 , C09J175/00 , C08L31/04 , C08L75/00
CPC分类号： C09J175/00 , C08G18/6484 , C08G18/706 , C08L97/02
摘要： This invention relates to formaldehyde-free, aqueous glue dispersions which contain polyisocyanates. These systems are particularly suitable for gluing veneers and surface materials on wood and wood products. The systems are prepared from polyisocyanates in combination with extenders based on flours and cold water-soluble of hydrolyzed natural starch. In this process, polyisocyanates or aqueous dispersions thereof are added while stirring to aqueous solutions or mixtures of starch and flour.The extender-containing adhesive systems are aqueous glue dispersions having increased service life which in their preferred embodiment contain about 15 to 30% by weight of polyisocyanates, preferably polyphenyl-polymethylene polyisocyanate (PMDI), 10 to 15% by weight of starch which is soluble in cold water and 14 to 25% by weight of (cereal) flour and optionally, other additives and the appropriate quantity of water adding up to 100% by weight. The glue dispersions are easily applied with glue spreading machines and if applied in suitable quantities do not bleed through veneers. The implements used for applying the glues can easily be cleaned by rinsing them with water.The invention is also directed to the use of the glue dispersions for gluing, particularly for gluing veneers or other surface coating materials to wood or wood products.
摘要翻译：本发明涉及含有多异氰酸酯的无甲醛水性胶体分散体。这些系统特别适用于在木材和木制品上胶合单板和表面材料。该系统由多异氰酸酯与基于面粉和水解天然淀粉的冷水溶液的增量剂组合制备。在此过程中，将多异氰酸酯或其水分散体在搅拌下加入淀粉和面粉的水溶液或混合物中。含增量剂的粘合剂体系是具有使用寿命延长的水性胶体分散体，在其优选实施方案中含有约15至30重量％的多异氰酸酯，优选聚苯基多亚甲基多异氰酸酯（PMDI），10至15重量％的可溶解淀粉在冷水和14-25％（重量）的（谷物）面粉和任选的其他添加剂和适量的水加起来达100重量％。胶水分散体可以很容易地用胶涂布机涂抹，如果适量涂抹，则不会通过胶合板渗出。用于施加胶水的工具可以通过用水冲洗来容易地清洗。本发明还涉及胶粘剂分散体用于胶合的用途，特别是用于将胶合板或其它表面涂料材料粘合到木材或木材产品上。

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