Formulierung, Aufbereitung und Charakterisierung innovativer thermoplastischer Vulkanisate
183 pages, year of publication: 2010
price: 36.00 €
Innovative thermoplastic vulcanizates (TPV) with high oil resistance have be developed, consisting of thermoplastic polyurethanes (TPU) as matrix material and a dynamically crosslinked synthetic rubber phase. For the latter one ethylene-vinyl acetate copolymers (EVA) und and ethylene octene copolymer (EO) are used. The vulcanization step is realized by means of an organosilane crosslinking concept, wherein the crosslinking reaction of the rubber phase is carried out during the mixing step of the thermoplastic blend in a twin-screw extruder in the course of a two-stage process. For catalysis- and condensation reaction, new catalyst (Brønsted acid) and water carrier are added in rubber phase (EVA or EO) as an efficiency of the crosslinking agent to accelerate hydrolysis and condensation reaction during dynamic vulcanization of EVA und EO phase. It is also found that the MHA grafting copolymer is a suitable compatibilizer in this system. The selected compatibilizer exhibited significant improvement on the compatibility between the two phases. The generated thermoplastic valcanizates show outstanding property profiles. Due to the tailor-made property profiles of such TPVs a wide range of applications can be identified under economic aspects.