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    • 3. 发明授权
    • Process for preparation of stable polycarbodiimide dispersions in water, which are free of organic solvents and may be used as crosslinking agent
    • 在水中制备稳定的聚碳二亚胺分散体的方法,其不含有机溶剂并可用作交联剂
    • US07439316B2
    • 2008-10-21
    • US11320189
    • 2005-12-28
    • Laurentius Cornelius Josephus HesselmansAndries Johannes DerksenJacob Christiaan Munneke
    • Laurentius Cornelius Josephus HesselmansAndries Johannes DerksenJacob Christiaan Munneke
    • C08G18/70C08G18/08
    • C08G18/025C08G18/283
    • A process for the preparation of stable aqueous polycarbodiimide dispersions, to be used as crosslinking agent, which are free of organic solvents is described. Sid process is characterized in: reacting a polyisocyanate in the presence of a carbodiimide catalyst to form a polycarbodiimide, terminating and/or chain extending the polycarbodiimide chain by the addition of formation dispersion of the resulting compound in water, wherein pH is adjusted to a value between 9 and 14 by the addition of a base and/or a buffer to the water used for the dispersion and/or to the obtained aqueous dispersion. According to the present process said terminating or chain extending with the compound containing a hydrophylic group and one or more amine functions may also occur during or after the dispersion of the polycarboiimide in water. The preferred pH of the polycarbodiimide dispersions is between 11 and 13. Furthermore the invention related to a coating mixture comprising the polycarbodiimide dispersions obtained by the invention as crosslinking agent and an aqueous resin containing carboxylic acid functions. Finally the invention comprises cured material obtained by applying said coating mixture to a substrate, and evaporating the water.
    • 描述了用作制备用作交联剂的稳定的聚碳化二亚胺分散体水溶液的方法,其不含有机溶剂。 Sid方法的特征在于:在碳二亚胺催化剂的存在下使多异氰酸酯反应形成聚碳二亚胺,通过将所得化合物的形成分散体加入水中终止和/或链延伸聚碳二亚胺链,其中将pH调节至一个值 通过向用于分散体的水和/或所获得的水分散体中加入碱和/或缓冲剂在9和14之间。 根据本发明方法,在含有亲水基团和一种或多种胺官能团的化合物中延伸的终止或链可以在聚碳酰亚胺在水中分散期间或之后发生。 聚碳二亚胺分散体的优选pH为11-13。此外,本发明涉及包含本发明获得的作为交联剂的聚碳二亚胺分散体和含有羧酸官能团的含水树脂的涂料混合物。 最后,本发明包括通过将所述涂料混合物施加到基材上并蒸发水而获得的固化材料。