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 of pipes and internal surface of fitting with depth (25 mm) . Before pipe adhesion test the samples put under some environmental conditions such as (at room temperature , at (80 o C) for (4 hr) , at (-2.5 o C) 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) with PVC adhesive, without surface treatment only (cleaning), under environmental conditions , the failure (pulling) happened in adhesion zone (adhesive adhesion failure) . As appearance of results of pipe adhesion testing for (PVC pipe -PVC fitting) with PVC adhesive by using surface treatment (surface roughness with abrasive paper and chemical treatment with alcohol), under environmental conditions, the failure happened in PVC pipe (pipe cohesion failure).