Preparation method of polyhexamethyleneguanidine hydrochloride

• Main Authors: Zhang Yuyi, Xie Weiyue, Ren Liya, Zeng Ping, Jiang Jian, Xu Yun, Wei Panzhong, Yang Yaling
• Format: Patent
• Language: Chinese; English
• Published: 03.08.2016
• Subjects: CHEMISTRY; COMPOSITIONS BASED THEREON; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP

The invention discloses a preparation method of polyhexamethyleneguanidine hydrochloride. The method comprises the following steps: (1) polycondensation reaction: adding raw materials guanidine hydrochloride and 1,6-hexamethylenediamine into a reactor, stirring and heating to react in two stages, wherein the reaction is carried out for 2-10 hours after the material temperature is raised to 130-150 DEG C in the first stage, and the reaction is carried out for 1-5 hours after the material temperature is raised to 185-195 DEG C in the second stage; (2) saponification reaction: lowering the material temperature to 140-160 DEG C, adding a sodium hydroxide solution to regulate the pH value to 12 or above, and after finishing adding the sodium hydroxide solution, keeping the temperature at 90-120 DEG C for 1 hour or above; (3) skimming and washing: separating out the lower water layer of the reaction solution, and washing the upper layer with water to obtain water-insoluble polyhexamethyleneguanidine; (4) salificati