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Preparation method of dicyandiamide-formaldehyde polymer and its modified product (1)

 Last Update: 2021-11-05
 Source: Internet
 Author: User

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Dicyandiamide-formaldehyde polymer and its modified products

[Preparation method] Dicyandiamide-formaldehyde polymer is a polycondensation of dicyandiamide and formaldehyde in the presence of strong acid or salt, and is a cationic polycondensate

(1) Reaction history of dicyandiamide, formaldehyde and ammonium chloride

Friedrich Wlof published an article in "Melliand Textilberichte" in 1967.

During the reaction, ammonium chloride is added and the hydroxymethyl dicyandiamide reacts as follows:

Further react with formaldehyde to form

The hydroxymethyl group on the above intermediate product reacts with the amino group on another molecule to form a methylene bond to form a polymer with the following structure:

Related links: Guanidine-epichlorohydrin polymer and dicyandiamide-epichlorohydrin polymer

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