MATERIALS | HIGH TEMPERATURE PLASTICS
offerings include PEK, PEKK, and poly (2,5-benzimi- dazole) (ABPBI), which can resist continuous temperatures from 250 to 300°C. G-PAEK polyetherketone (PEK) has a glass transi- tion temperature of 152°C and melting tempera- ture of 373°C, offering extended high temperature performance together with toughness, strength, and chemical resistance. It is available in unfilled as well as filled forms. GCL says it crystallises quickly, so requires less cooling time than materials with comparable performance, reducing cycle time. Typical applications include gears, seals and connectors. GAPEKK polyetherketoneketone (PEKK) com- bines high temperature stability, strength and stiffness, and ease of processing. It also has very high load bearing capacity, creep resistance, and inherent flame retardancy. GCL is the only com- pany in the world that can offer PEKK with ratios of the two ketone monomers terephthaloyl and isophthaloyl (the so-called T:I ratio) starting at 60:40, passing through 70:30 and 80:20, to 100:0, according to Jaimin Zaveri, General Manager, Marketing and Application Development. PEKK can be injection moulded from 305°C to 400°C depending on the T:I ratio.
T:I ratio 100:0 80:20 70:30 60:40
Tm 0C 390 369 335 305
Melting point of PEKK varies according to the T:I ratio. Tgs are in the range from 160°C to 173°C Source: Gharda Chemicals
Zaveri says GAPEKK has the highest compres-
sive strength of any polymer in the ketone family, while retention of mechanical and physical proper- ties up to 300°C is higher than any other engineer- ing polymer. Target applications include nozzles, powertrain components, aerospace parts, gears, and seals. GAZOLE 6000 grades are ABPBI-based blends and alloys offering high mechanical performance up to 300°C, well above the glass transition temperature of 160-170°C. ABPBI is blended with PEK to make it melt-processable. Offered as replacements for metals and sintered carbons in parts requiring very high wear resistance, they are inherently lubricious, giving parts with a very smooth surface finish and exceptional abrasion resistance. Eurostar Engineering Plastics has a unique
76 COMPOUNDING WORLD | October 2020
view on high-temperature-resistant injection- mouldable plastics, says Alexis Chopin, the company’s head of technology. “We are converting an engineering resin into a high-heat resin,” he says. “New applications are rising even for struc- tural parts linked to engines and submitted to heat and mechanical stress.” All developments are covered by NDAs. For some time now, as an alternative to high
heat plastics, Eurostar EP has been proposing speciality radiation-crosslinkable polyamide compounds with core products very well suited for demanding E&E applications such as circuit protection equipment or contactors for parts running in tough electrical arc environments. “As part of this product line, Eurostar EP is now launching a new crosslinkable polyamide product line based on very high glass fibre content that is very well suited for metal replacement,” says Chopin. These new grades (Staramide PF0012K with a glass fibre content of 60% is just one) offer extremely high rigidity (tensile modulus above 20GPa ), good impact resistance (Izod unnotched impact strength above 50KJ/m2
), outstanding
dimensional stability, and very low creep in the temperature range of -40°C up to +130°C. “They can withstand peak temperature even above the melting points of standard high-heat polyamides such as PPA. These products are well suited for structural UTH automotive applications where all these requirements are needed.” Crosslinking is carried out (normally by a specialist external service company) on moulded parts via beta or gamma irradiation (typically 50-100kGy). Eurostar EP is also developing a new concept based on thermal crosslinking.
CLICK ON THE LINKS FOR MORE INFORMATION: �
www.solvay.com �
www.dupont.com �
www.kuraray.com �
https://akro-plastic.com �
www.lehvoss.de �
www.dsm.com �
www.xeniamaterials.com �
www.basf.com �
www.lati.com �
www.polyplastics-global.com �
www.victrex.com �
www.gharda.com �
www.eurostar-ep.com �
www.evonik.com
This article was first published in Injection World, September 2020
www.compoundingworld.com
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