The Effect of Acid Phosphate Compounds on Adhesion Properties of Acrylic Adhesives

Abstract

Effects of an acid phosphate compound having an acrylic group on various metal surface were studied with respect to adhesive properties of acrylic adhesive. Results had shown that substrates treated with the primer which contains acid phosphate compounds were superior to untreated substrate.XPS spectra revealed the formation of strong ionic interactions between phosphate groups and metal surfaces. These formation could be achieved even if a metal oxide layer existed on a metal surface. Angular dependence of XPS spectra revealed that acrylic groups of acid phosphate compounds faced toward outsaide surface. It was supposed that acid phosphate compounds containing acrylic groups were expected to react to metals with the phosphate groups to make ionic interactions and react to adhesives with acrylic groups which face outside surface, to be involved polymerzation; as a result bond strength increased and failure mode was improved.