Cyanoethylated cycloaliphatic diamive adducts with acrylonitriles - used as hardeners for epoxide resins

摘要

Use of cyanethylated cycloaliphatic diamines having 1 or 2 rings, and in which one amino gp. can be replaced if necessary by a H2N-CRR gp. with R = H or Me. Prepd. from an adduct of 0.75-1.5 mol. acrylonitrile or Me acrylonitrile with 1 mol. of diamine. Used if necessary in combination with other hardeners or accelerators to harden epoxide resins. As starting matls. can be used 1,4-diamino-cyclohexane, 4,41-diamino-dicyclohexane, 2,2-bis-(4-aminocyclohexyl)-propane. Also amines such as 3-aminomethyl-3,5,5-trimethylcyclohexylamine (Isophorondiamine), 2-aminomthylcyclopentylamine and Menthandiamine. Adducts prepd. esp. with mol. ratio 1:1, result in hardened liq. epoxide resins of low stress, and low susceptibility to shrinkage and cracks. Martens values of 90-100 degrees C and low water absorption attainable. A considerable redn. in peak temp. at hardening is obtd. when compared with use of prior art adducts.