MBS AND CPE IN RIGID PVC PIPE FORMULATIONS

摘要

The impact behavior of poly(vinyl chloride) (PVC) pipe formulations containing either: chlorinated polyethylenes (CPEs), impact-grade methyl methacrylate butadiene styrene (MBS) , MBS/CPE mixture or an acrylic core-shell impact modifier were evaluated using an instrumented impact tester. The lubricants were adjusted for each modifier to yield similar fusion times. Compounds were extruded on a laboratory-scale twin screw extruder and impact tested at low temperature [-10℃] conditions. Fusion bowl stability testing was also performed on each blend. The results showed a 50-50% MBS/CPE blend had improved thermal stability and lower extrusion pressures than pure MBS, while retaining good output and comparable impact performance to pure MBS, CPE or acrylic formulations.