additives | Carbon black
This, together with very low levels of other contaminants, makes them particularly suitable for high-end applications where, she says, alternative products such as carbon
nanotubes cannot be employed due to their high levels of
Above: Wire and cable is a typical application sector for Orion Engineered Carbons
Right:
Electronic packaging is a
key market for conductive
carbon blacks, according to Cabot
metallic impurities. “Other commercial products in the market with comparable purity need to be added at much higher levels, introducing a higher level of impurity in the final compound,” she adds. A recent introduction is Ketjenblack EC600JD
Powder ( the current regular Ketjenblack EC600JD is supplied in soft pellet form). Conte says the new product form targets the battery industry and specific polymer compounding applications. Orion Engineered Carbons highlights specialty
Below: Batch production of carbon black by pyrolysis of used car tyres at Pyrolyx in the Netherlands
conductive furnace blacks intended for compounds for premium applications. Two high-purity grades are ideal for medium and high-voltage cable applications, says technical market manager Bhuvanesh Yerigeri. He describes XPB 565 as a non-treated furnace black with very high purity and excellent dispersion properties. It is designed for medium and high-voltage cable applications such as semi-conductive or conduc- tive jacketing compounds, and where electrostatic dissipation (ESD) is desired (high-end electronic packaging applications, for example). He says the grade’s low levels of ions and sulphur make it a particularly good choice for sensitive, strippable cable applications in semi-conductive compounds. “Due to high physical cleanliness and smooth pellet quality, an excellent dispersion results in a high surface smoothness that reduces electrical stresses, which can promote the growth of water trees and hence reduced service life in extruded semi-conductive sheets,” Yerigeri claims. A second grade, Arosperse 5-183A, is a soft-beaded
furnace black with low levels of impurities for use in semi-conductive shields for medium-voltage power transmission cables. It is said to be optimal for strippable compounds. Yerigeri adds that it is excellent for electronic packaging, which requires clean, smooth conductive surfaces. Cabot is continuing to invest in production of Vulcan
XCmax 22 conductive carbon black, George Haines says (see CW Nov 2014). This is being qualified in a range of applications, including automotive, in both polyolefin and engineering resins. Cabot continues to invest in innovations elsewhere
too, Haines also says, most recently in the synthetic fibre area where it is in the process of introducing a new higher jetness carbon black that can be used in polyester synthetic fibre. He says the product is being
tested by leading fibre producers in Asia. Results show it gives higher jetness than the company’s existing Black Pearls 5560 carbon black without significant downgrade in filter pack life. Typically, there is a trade-off between filter pack life and jetness,” Haines says. “With this new product, we are moving off that curve.”
Carbon blacks from recyclate Development work continues on production of carbon black from waste products. Pyrolyx cites its pyrolysis technology for treating used tyres, which yields not only carbon black but also gases “with natural gas-like qual- ity.” These can be sold as a valuable raw material, processed further, or used as energy carriers in the manufacture of additional carbon blacks (see CW Nov 2014). Pyrolyx has a test plant in the Netherlands, where it says it has been able to consistently improve test results. “Traditional carbon black production requires approximately 1.8 tonnes of oil as feedstock, producing 1.0 tonnes CB, but also producing about 3.0 tonnes of CO2
emissions,” the company says. “2.5 tonnes end-of- life-tyre granulate as feedstock results in 1.0 tonnes CB
34 COMPOUNDING WORLD | November 2015
www.compoundingworld.com
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