materials | ETPs
technology that remains inactive during processing; the material is said to mould extremely well giving parts with Class A surfaces (depending on the mould). However, elevated temperatures during use activate the technology, leading to a rapid cross-linking that boosts the mechanical properties far beyond their initial values. Solvay will launch further materials in the RED
range, all of which will feature improved heat perfor- mance, Mitchell says. Already in the line-up in fact is REDs, which is a Technyl HPS re-branded. This is a polyamide 66 for temperatures of up to around 200°C, and contains no smart molecule. BASF continues to add to its portfolio of conventional
Properties of Technyl REDx polyamides improve with rising temperatures, according to data from Solvay Engineering Plastics
and appliance parts in contact with drinking water. The two Aestus T2 grades feature 30% glass
reinforcement. Aestus T2 ERV300W is a black grade with heat deflection temperature of 282°C pitched at applications such as fuel connectors; Aestus T2 RV300HF is a natural grade offering a heat deflection temperature of 280°C and suitability for lead-free soldering. One Aestus T3 grade is available now, a 50% glass reinforced natural type. Not all the new developments in ETPs are in PPAs,
however. Technyl REDx from Solvay Engineering Plastics is described as a self-reinforcing smart molecule that allows the gap between standard polyamides and high-end thermoplastics such as PEEK, as well as metals, to be bridged. According to Solvay Engineering Plastics General Manager Peter Browning Technyl REDx is not a simple PA 66 but the result of a mixture of chemistry and formulation. “We are leverag- ing our capabilities along the 66 chain. We are making use of various synergies, it’s not just one thing,” he says. The driver for the new Technyl product is the
Right: A charge air cooler end tank injection moulded in
Technyl REDx from Solvay Engineering Plastics
72
automotive industry and the first resin in the series – Reds - will soon be used for a charge air cooler (CAC) intake. “It’s all to do with engine downsizing,” says James Mitchell, Global Automotive Market Director. “At the high temperatures we are now finding under the hood, many plastics start to degrade. The properties of Technyl REDx actually improve.” After 3,000 hours at 220°C, for example, the tensile strength of Technyl REDx increases by more than 50%, and there is no fall in elongation at break.
The property gain is the result of a self-reinforcing
COMPOUNDING WORLD | April 2017
www.compoundingworld.com
PAs as well. Ultramid B3U50G6, a flame-retardant 30% glass fibre reinforced PA 6, is described as a light-col- ourable grade that reliably meets the household appliance standard IEC 60335–1 (glow-wire test, GWIT 800°C at 1 mm) and provides a particularly high flow. It uses a new flame retardant system, which is not halogen-based and contains no antimony compounds, allowing it to achieve good values with regard to smoke density and smoke toxicity. DuPont’s Zytel XT series is the latest addition to its
high temperature PA66+PA6 family and is aimed at addressing the increasing need for cost efficiency and high temperature resistant materials for air manage- ment systems. The materials are said to offer an excellent balance of injection moulding and welding processing characteristics while retaining good mechanical properties at a continuous temperature up to 200°C, and through peaks as high as 220°C. In addition, they deliver “outstanding” fatigue resistance and stiffness at in-use temperatures in turbocharged engine environments. The first two Zytel XT grades, soon to be available, will have glass fibre contents of 35% and 50%. Ascend Performance Materials says it is currently
working on development of the next generation of high temperature polyamide 66-based materials. HT grades of Vydyne already on the market that can withstand 190°C for 3,000h; it is developing next generation products that will be able to take continuous tempera- tures of 210-220°C.
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