A NEW GENERATION OF REACH-Compliant Ketamine Epoxy Curing Agernts

摘要

Anew generation of ketamine epoxy hardeners are technically outperforming their analogous predecessors both during and after cure.This article examines why their unique combination of long pot-life,reduced hazard and fast thin-film cure speeds make them the ideal curing agents for the paint and coatings industry.Traditionally,ethylene amines have been used as epoxy curing agents and can cross-link epoxy resins to form an infusible mass.However,their poor compatibility with conventional aromatic epoxy,inherent toxicological properties and low active hydrogen equivalent weights with subsequent low stoichiometric loading levels negates their use in modern formulated systems.Many modification techniques are employed to enhance their performance,including reaction with carboxylic acids to generate amido-amine and polyamides,mannich bases,association salts,adduction,and for applications requiring high latency and fast thin film cure,ketamines.