MATERIALS | NATURAL FIBRES AND FILLERS
Right: PLA reinforced with 30% lignin increases flexural and tensile
modulus by approximately 30% compared to uncom- pounded PLA, says Krauss Maffei
ment for carbon black, where it provides the same dark black colour and UV-resistance, with no differences in processing of the compound, says Gibbs. In other applications that need higher thermal resistance, such as a battery housing, a different type of DamaBlack carbon is used at a higher loading (up to 40%). The company is collaborating with European electric vehicle maker Polestar on a long-term project that intends to produce a completely carbon-neutral vehicle by
IMAGE: KRAUSSMAFFEI
2030. DamaBlack is being evaluated in tyres, weatherstripping, and in a UV-coating layer on injection-moulded interior trim parts. In addition to durable automotive components, the company is working with producers of single- use plastics, such as packaging or compostable cutlery. The filler is also being tested for 3D-print- ing filaments. Gibbs says that a wide range of polymers, including polyolefins and bioplastics, such as PLA and PHA, have shown good results. “We are currently making 6,500 [US] tons/yr and planning for a second location,” says Gibbs. “We are collecting biomass within 150 miles of our facility to keep their carbon footprint low.” New Polymer Systems (NPS), based in Delaware,
US, developed its NeroPlast bio-renewable lignocel- lulosic biochar as a weight-saving filler for thermo- plastics. NeroPlast is available as a highly concen- trated masterbatch, and it is sufficiently temperature stable for processing with all thermoplastic resins, says Joe Roesler, cofounder of NPS. The deeply pyrolysed biochar is hydrophobic, which makes it more compatible with polymers and longer-lasting than hydrophilic natural fillers, says Roesler. NPS recently entered into a manufacturing and
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