A Study of Coating Adhesion on an Oxidized Wax Containing Polypropylene

Polypropylene has experienced wide commercial surface pretreatment techniques to attain good coating adhesion. In this study, the influence of polar surface modifier; Oxidized Polypropylene Wax (OPPW) was investigated mainly on the surface properties of its blends with polypropylene. Pull off adhesion test was employed to evaluate the adhesion strength of an acrylic based coating. The incorporation of polar wax caused almost linear increase in both surface energy and coating adhesion of the blends. A maximum surface energy of about 37 mJ/m2 was obtained for the compound containing 10 wt% OPPW. The adhesion promotion approach is believed to work via good molecular contact, specific interfacial interactions between polar components of both coating layer and the outermost OPPW chains at the surface. Prior to coating application, a heat treatment stage (60 ºC for 100 hours) on substrates increased the coating adhesion substantially. ATR spectroscopy was useful technique in characterizing polar groups in the surface region of blends

A Study of Coating Adhesion on an Oxidized Wax Containing Polypropylene Keywords:

Adhesion , Coatings , Wax , PP