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ETHERIFIED MELAMINE-FORMALDEHYDE CONDENSATES WITH A HIGH SOLIDS CONTENT AND LOW VISCOSITY

机译:高固含量,低粘度的三聚氰胺-甲醛缩合物

摘要

Process for the preparation of etherified melamine/formaldehyde condensates, in which first a methylolation of melamine with a formaldehyde component in the molar ratio of from 1:6 to 1:15, preferably at a pH of 7, is carried out. This is followed by an etherification of the resulting hydroxymethylation intermediate in the presence of a C1-C20-alkyl, preferably of a C1-C6-alcohol, particularly preferably of a C1-C4-alcohol, at a pH of 4.5, and subsequently by at least one distillation step in order to remove in particular methanol from the system, the pH of 9.5 being established before, during and/or after the distillation. According to the invention, a plurality of hydroxymethylation, etherification and distillation steps follow in order to achieve an etherified melamine/formaldehyde condensate which is distinguished by a high degree of hydroxymethylation, a high solids content and a low viscosity.
机译:制备醚化三聚氰胺/甲醛缩合物的方法,其中首先进行三聚氰胺与甲醛组分的摩尔比为1:6至1:15,优选在> 7的羟甲基化。然后在pH <4.5的C1-C20烷基,优选C1-C6-醇,特别优选C1-C4-醇存在下,将所得的羟甲基化中间体醚化,随后通过至少一个蒸馏步骤以从系统中除去特别是甲醇,在蒸馏之前,期间和/或之后建立> 9.5的pH。根据本发明,随后进行多个羟甲基化,醚化和蒸馏步骤以实现醚化的三聚氰胺/甲醛缩合物,其特征在于高度的羟甲基化,高的固体含量和低的粘度。

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