METHOD FOR PREPARING DISINFECTING AGENT Russian patent published in 2005 - IPC

FIELD: chemical technology.

SUBSTANCE: invention relates to a method for preparing disinfecting agent as derivative of polyhexamethylene guanidine. Method involves thermal polycondensation reaction of hexamethylenediamine and guanidine hydrochloride for two stages. At the first stage hexamethylenediamine is added to guanidine hydrochloride melt up to the molar ratio = 1:1 and mixture is subjected for control thermostatically up to ceasing ammonia evolving. At the second stage hexamethylenediamine excess is added to formed melt of polyhexamethylene guanidine chloride that is taken as measured its molar ratio with guanidine hydrochloride = 2:n wherein n means degree of polymerization that is calculated based on molecular mass of terminal groups of polyhexamethylene guanidine derivative obtained at the first stage by the following formula: n = [%Cl]*Mk/(35.45-[%Cl]*177.678) wherein %Cl means the relative content of chlorine by mass in derivative of polyhexamethylene guanidine; Mk means molecular mass of terminal groups of polyhexamethylene guanidine derivative and at Mk = 17.034 the relative content of Cl is determined in reaction mixture before addition of hexamethylenediamine excess, and at Mk = 215.382 the relative content of Cl is calculated in the composite of polyhexamethylene guanidine derivative formed at the second stage. Then the reaction mixture is subjected for control thermostatically at temperature 165-200°C up to ceasing ammonia evolving. The end product is prepared as polymer-analog of polyhexamethylene guanidine chloride. Invention provides reducing yield of the end product in water-insoluble fraction and to enhance bactericidal activity of disinfecting agent. Invention can be used in medicine and veterinary science, in treatment of natural and sewage waters, in processes for leather and fur tanning and in industrial and domestic conditions wherein bactericidal preparations are required.

EFFECT: improved preparing method.

1 tbl, 2 ex