Carbon black | additives
delivers very graphitic carbon blacks, with a lower number of oxygenated groups on their surface than furnace blacks with the same surface area. This makes them much more hydrophobic, Van Bellingen claims. “The low moisture content and low moisture pick-up of a carbon black is crucial to ensure excellent system stability. This is obvious for the water sensitive poly- mers but also for many other polymers.” She adds that a large part of any moisture in a carbon black will remain in the compound even after drying.
Super-conductive blacks At AkzoNobel, technical development manager Elisa Conte highlights the company’s Ketjenblack EC300J and EC600JD grades of high purity “super-conductive” carbon blacks. “Their high surface area, together with the highly branched micro-structure, constitutes the perfect environment for conducting electricity,” she says. “This allows up to five times lower concentrations in polymer compounds compared to competitive materi- als, to reach the same resistivity.” According to Conte, nitrogen adsorption tests reveal surface areas of 800 and 1,400 m2
/g for Ketjenblack
Left: Post reactor technologies can reduce PAH content in carbon black, says Omsk Carbon Group
EC300J and EC600JD respectively. “High pore volume as revealed by dibutyl phthalate adsorption tests allows very low addition of Ketjenblaks to the compound, leading to materials inherently more resilient to mechanical stress,” she says. “High loadings of blacks can hamper the dispersion process during compound- ing and compromise key physical properties such as elongation at break.” Conte also highlights the very low metals content in Ketjenblack products, at generally lower than 1 ppm.
Polymers
ENSACO TIMCAL Carbon Black
• electrical conductivity • easy-dispersion • high purity
For electronic packaging, fuel hoses, fl ooring, power cables and accessories, conveying belts, ATEX applications.
®
TIMREX TIMCAL Graphite
• thermal conductivity • electrical conductivity • lubrication
For seals, water-meters, heat sinks, geothermal pipes, LED light sockets, primers for electrostatic painting, gas barrier properties.
®
imerys-graphite-and-carbon.com
CONDUCTIVE CARBON BLACK
GRAPHITE AND EXPANDED GRAPHITE
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