AUTOMOTIVE INTERIORS AND EXTERIORS | MATERIALS
stabilisation for ASA high gloss materials, suited for automotive exterior applications. The new grade offers best-in-class UV protection for Luran S, result- ing in less graying of parts, significantly improved gloss protection after prolonged UV exposure and substantially enhanced colour depth. An improved Novodur H701 ABS grade targets interior applications like door panels, pillars and covers for crash tests, and brings an increased level of heat and impact resistance that contributes to passenger safety while allowing for greater design freedom.
Novodur Ultra 4255 is designed to address the demands of automotive interior designs including glove box doors or centre and overhead consoles. Key features of the material include low tempera- ture ductility, high impact strength, high heat resistance and low emission. It’s high flowability contributes to good processability. Lanxess’ Tepex Dynalite continuous-fibre-rein-
forced composite materials provide a lightweight solution as mechanically stable underbody paneling components for new vehicle applications in China. Chinese carmaker Li Auto, Beijing, a manufacturer of electric vehicles and said to be the leader in China of new energy vehicles, incorpo- rates the Tepex Dynalite underbody paneling components to its Li 9 and newly launched Li 8 models of six-seater, family plug-in-hybrid SUVs. The paneling component is around 1.5 m in
length, 1 m wide and 3-4 mm thick. It is manufac- tured with a 1 mm thick insert made from Tepex Dynalite 104-RG600 and an additional extruded Direct Long Fibre Thermoplastic (DLFT) mass. Both materials are heated and plasticized and then placed in a compression tool, where they are moulded together in a single step. The matrix of the Tepex insert consists of PP and is reinforced 47% by volume of continuous glass fibre rovings. The PP DFLT mass contains 40% long glass fibres by weight. The resulting underbody panel is around 30% lighter than a comparable steel design and more highly resistant to underside road surface impacts. When compared to other material concepts such as pure DLFT, the Tepex reinforcement makes the paneling component stronger and more rigid and energy absorptive. Lanxess says a development about to be completed is a matrix plastic based on PA 6 for Tepex Dynalite that is produced starting from a “green” cyclohexane, and therefore consists of well over 80% sustainable raw materials. The plastic meets the requirements Lanxess has set for its new Scopeblue range which contains a significant
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portion of recycled or bio-based raw materials or has a carbon footprint that is considerably smaller than that of conventional products. The semi-fin- ished products with a green matrix are suitable for applications in structural lightweight design that are typical for Tepex Dynalite, such as automotive front-end carriers, seat shells or battery consoles. Another product line comprises variants of
Tepex, with a proportion of recycled material of up to 80%, that yield surfaces with a forged carbon look. The high proportion of recycled material is based on carbon fibres from post-consumer and post-industrial waste used as non-woven material or as chopped fibre mats. A variety of thermoplas- tics, including recycled PA 6 and 66, PP or PC are suitable as a matrix material. The mechanical properties of the composite semi-finished product are isotropic and approximate the Tepex range of continuous glass fibre reinforced composites. The materials are suited to applications that require high-class decor and high-grade mechanical properties, such as car interiors and exteriors. PA and PBT producer Eurotec says it has many
material solutions for various interior applications. One application, a sunroof cable harness, needs high flexibility, toughness, strength and efficient processing. Tecomid NB60 NL PM PA6-I provides a solution, having 1,500 MPa tensile modulus and 85 kJ/m2
Above: Lanxess’ Tepex Dynalite is used for underbody paneling
components in Li Auto’s Li 8 SUV
izod notched impact resistance. In gear lever
applications, there is a need for long-term mechan- ical properties and stiffness. Eurotec offers solu- tions with Tecomid NG and Tecomid HT NT with different loadings of glass fibre to overcome reduction on mechanical properties due to moisture uptake. In exterior applications, one of the key param- eters is high UV stability, says Eurotec, which developed Tecodur PBT grades for this issue. Tecodur PB70 GR50 BK009 CE01 PBT GF50 is used for side mirror applications in many well-known OEMs due to a combination high mechanical
November/December 2022 | INJECTION WORLD 47
IMAGE: LI AUTO
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