| 摘要 |
1497377 Curing epoxy resins SOC CHIMIQUE DES CHARBONNAGES 15 June 1976 [20 June 1975] 24628/76 Heading C3B A hardener for epoxy resins is prepared by a reaction, in which at least one mole of water per acid equivalent is eliminated, between a mixture of (A) 90-60 parts of at least one unsalinated monobasic acid (I) having at least 12 carbon atoms and 10-40 parts of an acid (II) of M.W. <200; and (B) 20-80 parts of a polyalkylene polyamine (III) and 80-20 parts of isophorone diamine. The relative proportions of (A) and (B) are such as to provide 1-2 gram equivalents of acid per gram molecule of amine. I may be oleic acid; II may be acrylic, propionic, benzoic or adipic acid III may be tetraethylene-pentamine. Up to 70% by wt. of I may be replaced by a dimeric or polymeric fatty acid. Reaction of (A) and (B) may take place at 160-180‹ C, the water being removed from the reaction medium as formed. The curing agent may be used in the form of an organic solvent solution or as an aqueous dispersion. Uses.-Coating compositions esp. emulsion paints. |
