METHOD OF PRODUCING HARDENER FOR LOW-MOLECULAR WEIGHT EPOXY RESINS Russian patent published in 2012 - IPC C07F7/10 C08G59/40 C08G77/26 

FIELD: chemistry.

SUBSTANCE: disclosed is a method of producing a hardener by reacting, while heating to temperature 80-100°C, aminoalkyl alkoxysilane or siloxane of general formula [RSi(OR')aO_(3-a)/2]n (I), where R is 3-aminopropyl or N-(2-aminoethyl)-3-aminopropyl, R' is methyl or ethyl; a=1.0-3.0, n=1-9, with methyl phenyl cyclosiloxane, methyl phenyl dialkoxy-silane or methyl phenyl alkoxysiloxane of general formula [(CH₃)(C₆H₅)Si(OR')bO_(2-b)/2]n (II), where R' is methyl or ethyl; b=0-2.0, n=1-5, with molar ratio of components I:II=1:(1-2.5) and total content of alkoxy groups in the starting components of 1-1.5 with respect to the number of silicon atoms. Synthesis is carried out in the presence of alkaline catalysts.

EFFECT: simple method of producing organosilicon hardeners which are stable during storage, use in compositions with low-molecular weight epoxy resins of which enables to obtain paint coats with good adhesion to different substrates and improved physical and mechanical properties.

1 cl, 3 tbl, 15 ex