show preview | 2016 Two years ago, in collaboration with the Wood
Competence Center in Linz, Austria, Wacker began developing new processing aids for wood-polymer materials. These materials are 50-75% refi ned wood fi bres and 25-50% polymer such as PE, PP or PVC. The plastics look similar to wood and have a similar feel. To enable the separate components to bond
effectively during extrusion – and to keep resistance in the process as low as possible – the additives are incorporated as lubricants. They contain a thermoplas- tic silicone elastomer. In comparison with conventional silicones – which cure irreversibly following vulcaniza- tion – thermoplastic silicones behave thermoplastically within a certain temperature range. Genioplast additives for wood plastic composites
Wacker’s Genioplast silicone additives raise the manufac- turing effi cien- cy of wood plastic compos- ites (WPCs), while boosting product quality
tures – and pressures up to 103MPa; deep water capability, down to 3,000m; light weight, for ease of installation and reduced pipe stress; and, resistance to a number of aggressive fl uids. “In oil and gas exploration the need to extend scope
and effi ciency motivates us to develop reliable solu- tions,” said Tom Swanson, energy director at Victrex.
www.victrex.com
Wacker has developed a new range of thermoplastic silicone additives that raise the manufacturing effi cien- cy of wood plastic composites (WPCs). Its Genioplast WPC additives improve processing
when extruding plastic blends that contain wood, to make the manufacturing process more cost effective and less energy intensive. The additives also enhance the mechanical properties and water-repellency of the materials, says the company.
primarily act as lubricants. They reduce the coeffi cient of friction of the plastic, and the internal and external friction during extrusion. This enables the processes to run more stably and effi ciently and save more energy. Tests show that 1% of the additive can increase throughput by 15-25% – depending on the plastic blend and extruder used. This leads to lower unit costs in production. In comparison, says Wacker, conventional lubricants require WPC manufacturers to use 2-6% of additive to achieve the same effect during extrusion. Genioplast WPC additives can be blended easily as the thermoplastic silicone elastomer is already premixed with the corresponding plastic. At present, formulations with PP (PP 20A08) and PE (HDPE 20A03) are available. Wacker says that the additives lead to end products with higher impact strength and fl exural toughness, as well as reduced water absorption.
www.wacker.com
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