Effect of Surface Treatment on the Adhesion Forces between PVC Adhesives and PVC (Pipe - Fitting)

Abstract

This paper aims to improvement adhesion forces between (USA PVC adhesive ,Commercial PVC adhesive and USA CPVC adhesive) and (PVC pipe – PVC fitting)by using surface treatment (mechanical and chemical treatment) for external surface ofpipes and internal surface of fitting with depth (25 mm) . Before pipe adhesion test thesamples put under some environmental conditions such as (at room temperature , at (80oC) for (4 hr) , at (- 2.5 oC) for (4 hr) , at ( tap water) for (48 hr) , at ( 3.5 % NaOH) for(48 hr) and at ( 3.5 % NaCl) for (48 hr) ) .Appearance of results of pipe adhesion testing for (PVC pipe – PVC fitting) withPVC adhesive, without surface treatment only (cleaning), under environmentalconditions , the failure (pulling) happened in adhesion zone (adhesive adhesion failure). As appearance of results of pipe adhesion testing for (PVC pipe – PVC fitting) withPVC adhesive by using surface treatment (surface roughness with abrasive paper andchemical treatment with alcohol), under environmental conditions, the failurehappened in PVC pipe (pipe cohesion failure).