Masterbatches silicone

For example, the scratch resistance of talc-filled TPOs modified with 2-3% silicone from masterbatches is significantly improved and visible whitening is suppressed under conditions that damage the same TPO without silicone. Paintability must be verified but a low silicone level (2.5% for example) does not affect paintability, and weathering resistance increases showing less change in aspect than the control without silicone. 

Kaneko, M. L. Q. A. Romero, R. B. Do Carmo Goncalves, M., High Molar Mass Silicone Rubber Reinforced with Montmorillonite Clay Masterbatches Morphology and Mechanical Properties. Eur. Polym. J. 2010, 46, 881-890. 

Milled below 10 pm uncoated/coated with stearic acid high gloss, toughne ss/rigidity in thermoplastics for uPVC extrusions, plasticized PVC cables and extrusions, polypropylene mouldings, masterbatch, and silicone sealants. 

The tube is extruded to high tolerances with continuous laser monitoring. The addition of liquid silicone at the hopper would make it difficult to keep within tolerances, whilst silicone masterbatch would be expensive and may also give dimensional problems. 

By direct injection into a CTM added to the extruder, the required level of silicone is incorporated into the HOPE with no dimensional tolerance compromises and economic savings are made by purchasing the silicone in 25 kg drums instead of using a masterbatch. 

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