of PVC blends and of the blend-extruded pipes
The processing properties of PVC blends and the service properties of sewage pipes extruded from those blends were studied in relation to the proportion of a stabilizing-lubricating agent added to the blend. PVC blends containing Baropan, a multicomponent stabilizing-lubricating agent used in amounts of 1.5-2.7 weight parts per 100 weight parts blend, were prepared and their bulk density, thermal stability (Congo Red test), and gelation parameters (Brabender plastograph) were measured. Sewage pipes (160 x 4 mm) were extruded and examined for standardized service properties, Brinell hardness, and Charpy impact strength. As the Baropan proportion was increased, blend's bulk density and thermal stability rose, gelation time became longer but slightly and the torque in the plastograph fell. Each blend was extrudable, provided the extrusion parameters were suitably modified. The pipes extruded met the standardized requirements. Mechanical property differences were all insignificant. Tests have shown the agent can be reduced in the blend without sacrificing extrusion yield and property values. Weighing spread as high as +30% oft met with in industrial practice, is tolerable, provided extrusion parameters are suitably adjusted.
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