Study of viscoelastic properties of epoxyurethane compositions for vibration protection of metal products

Abstract

The dynamic mechanical and vibration-absorbing properties of epoxyurethane coatings for vibration protection of metal products have been studied. It has been established that the chemical structure of modifying epoxy oligomers and their content in a mixture with oligester cyclo-cab oligomer affects the structural parameters of the epoxyurethane polymer matrix, which makes it possible to regulate their viscoelastic and damping roperties. As a result of dynamic mechanical studies, it was determined that with an increase in the content of epoxy oligomers (ED-20, T-111 and UP-655) in a mixture of oligester cyclo-cab oligomer L-803 from 10:90 to 30:70 wt.% observed of increase the dynamic modulus of elasticity and glass transition temperature. This is due to the fact that the epoxyurethane polymer is enriched with more rigid components: when using ED-20 and T-111, which contain aromatic fragments in their structure and chloraliphatic oligomer UP-655, which formation the matrix of strong intermolecular interactions due to strongly polar chlorine atoms. It has been established that epoxyurethane systems are characterized by one area of «devitrification», as evidenced by the onomodal peak of the maximum tgδ, and therefore it is possible to indicate the creation of a relatively homogeneous system.