additives feature | Carbon black
such as CCT have only recently developed the necessary quality and processing standards to bring commercialization of the product to the next level. “Our stringent feedstock specifications allow for a
Aemerge’s carbon black masterbatch containing equal propor- tions of N762 and Organic Black for injection- moulded products
resources and C02 emissions, but it can be offered at an
attractive price point,” he claims. “For every tonne of feedstock, we prevent the consumption of one tonne of oil, avoid emissions of 1.4 tonnes of CO2
, and convert
post-consumer rubber into a purposeful resource in the circular economy.” Many variations of rCB have been produced in recent
years, most marketed at the rubber industry and closed-loop tyre production. Although targeting the tyre rubber market will be essential in the future, CCT says that the long project lead times in this industry have led some rCB manufacturers to put more focus on plastics applications instead. CCT has a production plant in Stegelitz, 100 km west
of Potsdam, which it says is the first of its kind to operate at an industrial scale in Europe. It has been in production since 2012, and has a capacity of around 4,500 tonnes/year. It is currently in the engineering phase of planning a second plant (expected to be completed by the end of 2016), which will bring total capacity up to 14,500 tonnes/yr. The company has developed a line of products called
Recycled tyres are being used as source of
‘green’ carbon black
TintX, developed specifically for plastics applications. The company claims that they provide “excellent” mixing efficiency, ease of dispersion and low conductiv- ity versus traditional carbon black. “The high quality of the TintX line is due to optimal feedstock and com- mercial-grade post processing”, Theden says. “In addition, CCT is the only rCB producer where all grades are compliant with EU Regulation 10/2011 for food contact.” CCT uses technology developed in-
house.”For parties interested in our technology, we are open to joint ventures and to partner- ships,” it says. The core technology in the production of rCB is
thermolysis, a chemical decomposition of the feedstock at high temperature and pressure. This process has been around for decades, but companies
38 COMPOUNDING WORLD | November 2014
www.compoundingworld.com
high level of quality control; with each new grade of rCB coming from the same type of feedstock,” says Theden. “Most important, though, for a successful product is post-processing. Our state-of-the-art drying and pelletizing process delivers customers a commercial grade alternative to carbon black that can be easily integrated into their production process.” Aemerge in Indiana, USA, started producing a carbon black pigment called OrganicBlack from a rather unusual source, recycled wooden pallets, in July of this year. Aemerge also transforms other forms of organic waste, such as biomass, used tyres and plastics, into various other carbon-based products including activated carbon and a soil improver known as biochar. Aemerge obtains its feedstock from a sister company that renders the pallets. Adam Seger, head of sales and marketing at Aemerge, says yield is around 28%. Current production capacity for OrganicBlack is
around 3,200 tonnes/year. The company is currently supplying customers in North America. Aemerge says OrganicBlack can be used as an
extender to supplement the use of traditional carbon black. Third-party laboratory tests have compared a masterbatch containing equal proportions of Organ- icBlack and a conventional N762 carbon black pigment with a masterbatch containing just the conventional black. They found that tensile properties remain un- changed after a 500 hour UV-light weathering test. Higher amounts of OrganicBlack can cause a slight shift from blue to brown undertones as the percentage is increased. Aemerge offers carbon black masterbatch made
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