METHOD FOR PREPARING POLYAMIDE Russian patent published in 2005 - IPC

FIELD: organic chemistry, chemical technology.

SUBSTANCE: invention relates to a method for preparing polyamide that can be used as a structural material. Polyamide is prepared by co-polymerization reaction of ε-caprolactam and 1,6-hexamethylenediisocyanate taken among the group of di-isocyanates or urethane prepolymer SKU-PFL-100 in the mass ratio = (95-90):(5-10) in the presence of catalyst and activating agent. As a catalyst method involves using ε-caprolactam Na-salts and 2,4-toluylenedi-isocyanate as an activating agent. The process is carried out at temperature (180 ± 5)°C up to depletion of lactam cycles followed by heating the reaction mass for 2 h. Invention provides preparing polyamides with enhanced values of destroying stress (breaking point) and to expand assortment of methods providing preparing polyamides with different physical-mechanical properties.

EFFECT: improved preparing method.

2 tbl, 10 ex