New heat- and oil-resistant thermoplastic vulcanizate (TPV) for demanding underhood applications

摘要

Thermoplastic vulcanizates (TPVs) afford many advantages in terms of part design, processing methods, and part cost. Due to temperature- and oil-resistance limitations, current generation TPVs (including those based on ethylene-propylene rubber [EPDM] and polypropylene [PP]) and copolyester have had only limited applicability in many powertrain sealing, hot air duct, and boot applications. This paper will introduce a new class of heat- and oil- resistant TPVs. A polyacrylate (ACM)//polyamide-based TPV representative of this class will be compared to current generation TPVs and typical thermoset rubber. When tested out to 1500 hrs at 150°C, the ACM//polyamide TPV will be shown to exhibit less than 50% loss of tensile strength and ultimate elongation.