The course of Mg(OH)2 modified polyethylene extrusion process
Polimery 2000, No 1, 50
SummaryMedium-density PE (MFI, 0.712 g/10 min) was modified with Mg(OH)2, FR-20 grade, particle size 2.5 μm. Antiblocking and lubricating agents, 020–04, 020–15 and Lifoslip 220 PE were added as PE concetrates. Experimental extrusions in a Brabender Plastic-Corder (PLV 151 type), were carried out at screw speed 0.75 s-1, three-heating-zones temperatures 160°C, 170°C and 170°C, extruder head temperature 170°C, and extrusion velocity 1.72 mm/s. The pressure in the extruder head, the turning moment measured on the extruder screw, and the flow rate rose as the Mg(OH)2 content was increased (Figs. 1–3). With the Lifoslip agent, the pressure and the turning moment attained the lowest values. At high Mg(OH)2 contents, 57.5 and 60%, the pressure and the turning moment had values close to those attained with other auxiliary agents.