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June 08, 2022 12:20 PM

Ford, Rice University turn end-of-life auto plastic waste into new parts

Sarah Houlton
Urethanes Technologies International
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    graphene flash joule rice uni 800.jpg

    The amount of plastic used in vehicles is increasing as manufacturers chase weight reduction and improved fuel economy, but this is posing greater problems for the manufacturers in the light of end-of-life regulations for vehicles. The program between Rice University and Ford can convert the mixed plastics into enhanced polyurethane foam.

    Ford Motor Co. is working with Houston-based Rice University to reclaim plastic waste from automotive shredder residue and use it in enhanced auto foam programs.

    A team led by James Tour at Rice developed a flash Joule heating process to turn plastic parts from end-of-life vehicles into graphene.

    Ford then used the graphene for its graphene-infused polyurethane foam for use in new cars. This enhanced foam has been used in Ford vehicles since 2018 because of its noise reduction and heat resistance properties.

    The amount of plastic used in vehicles is increasing as manufacturers chase weight reduction and improved fuel economy, but this is posing greater problems for the manufacturers in the light of end-of-life regulations for vehicles.

    "In Europe, cars come back to the manufacturer, which is allowed to landfill only 5 percent of a vehicle," Tour said. "That means they must recycle 95 percent, and it’s just overwhelming to them."

    Much of the mixed plastic waste will be incinerated, according to Deborah Mielewski, a technical fellow at Dearborn, Mich.-based Ford and an author on a paper about the program. With the U.S. shredding more than 10 million vehicles a year, this makes for a large amount of waste.

    "We have hundreds of different combinations of plastic resin, filler and reinforcements on vehicles that make the materials impossible to separate," she said.

    Mixed untreated plastic waste from Ford F-150s

    And this is why Ford approached the Rice team, having become aware of its plastic-to-graphene process. Essentially, mixed ground plastic is blasted with a high voltage, and the sudden, intense heat of more than 2,500°C vaporizes the other elements, leaving behind turbostratic graphene. No solvents are required, and the energy requirements are not significant.

    Ford sent the Rice team about 5 kilograms of muddy and wet mixed plastic waste from a vehicle shredding facility to test the process.

    "We flashed it, we sent the graphene back to Ford, they put it into new foam composites and it did everything it was supposed to do," Tour said. "Then they sent us the new composites and we flashed those and turned them back into graphene. It’s a great example of circular recycling."

    To test its effectiveness on end-of-life mixed plastic, a mixture of shredded plastic bumpers, gaskets, carpets, mats, seating and door casings from end-of-life F-150 trucks was ground into a fine powder, with no washing or pre-sorting. It was first flashed for 10–16 seconds under low current to make a highly carbonized plastic, accounting for about 30 percent of the initial mass; the rest was out-gassed or recovered as hydrocarbon-rich waxes and oils.

    The carbonized plastic was then flashed under a higher current, with 85 percent converted to graphene and the remainder outgassed as hydrogen, oxygen, chlorine, silicon and trace metal impurities. A lifecycle analysis showed a substantial reduction in energy, greenhouse gas emissions and water use compared to other methods for making graphene.

    The work has been published in the journal Communications Engineering.

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