MATERIALS | HIGH TEMPERATURE PLASTICS
tions and power module parts like IGBTs and bobbins.”
With the acquisition last November of the engineering plastics division of DuPont, Celanese expanded its range of solutions to include more materials for applications requiring high tempera- ture stability. “If you consider the classic plastics pyramid, we now offer solutions from the very top of the temperature range, LCP and PPS, for example, through all manner of polyamide, to engineering grades of LFTs based on a PP matrix,” says Richard Chang, Celanese Market Manager E&E.
Chang and his colleagues recently collaborated
Right: A cooling water valve manufactured with EMS- Grivory high performance PA material
with VMAX New Energy, a Tier One supplier to one of China’s largest wireless charging infrastructure providers, on an 11KW wireless EV charging system now being introduced commercially. The system consists of two pads; a receiver that attaches to the car’s chassis and a transmitter mounted on the ground and connected to a power source. A non-halogen flame retardant Zytel HTN is used for the housing of the transmission plate. It protects the inner wireless charging system and prevents damage caused by drops, wheel compression, chemicals, oils, and UV. Cela- nese developed this particular Zytel HTN grade not only for performance, but also for high gloss and durability. Several other components in the charging system, including the vehicle-side coil housing and ground-side coil holder, are made using Zytel PA and Zytel HTN. Celanese says the wireless EV charger is a good
example of an application where high-temperature PPA and PA materials are required. However, for projects with even more severe temperature demands, it offer its Vectra and Zenite LCP materi- als. In a recent webinar, Young Kim, Senior Principal Engineer at the company, explained how the company’s LCP solutions are playing an important role in 5G data transmission infrastructure. The jump from 4G (15 MB/sec) to 5G (1-10 GB/
sec) wireless data networks requires robust materials to ensure reliable connectivity. Critical technical requirements include low moisture absorption, high dimensional stability, and consist- ent Dk/Df (dialectric constant/dissipation factor). LCP materials deliver all of those along with a HDT
40 COMPOUNDING WORLD | August 2023
(Heat Deflection Temperature) enabling them to 340°C to withstand lead-free soldering at 260°C for up to four minutes.
Competitive options Italian compounder Lati has introduced a range of performance grades — Laramid T — based on PA9T, which the company says offer very good thermal performance and a competitive price/performance ratio. Laramid PA9T compounds offer reliable mechanical performance up to a continuous use temperature of 150°C, which it says is a critical threshold for many fields, allowing them to compete with other PPAs and PPS in parts used in automotive, appliance, energy management, electronic and electrical devices. “Thanks to the glass transition temperature of the base resin, which is close to 130°C, Laramid T can immediately be counted among the resins suitable for use in applications where heat accumu- lation is a real problem,” according to the com- pany. “The polymer melts at between 290 and 310°C, meaning that its transition window is similar to those of other PPAs and of PPSs.” The Laramid T
portfolio is described as a fully developed group of compounds including glass and carbon fibre reinforced grades for
structural applications, as well as thermally and electrically conduc-
tive and self-lubricating compounds. Halogen and red phosphorous-free flame retardants are avail- able in both reinforced and unreinforced versions with UL approval said to be forthcoming. The materials provide the high flow rates required to fill suitable for complex thin-wall geometries with very narrow dimensional tolerances. Swiss resin producer EMS-Grivory says that,
compared to conventional PPA, its Grivory HT6 grade offers a 20°C higher glass transition temperature so provides a significantly increased load-bearing capacity at high temperatures. It says the heat deflection temperature (HDT/C) has been increased by 50°C to 250°C, which it says is 20°C more than a typical PPEK. According to the company, Grivory HT6 offers very good creep resistance, making it particularly suitable for components operating at high working temperatures, but also for production of parts requiring high dimensional stability and long
www.compoundingworld.com
IMAGE: EMS-GRIVORY
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