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A new approach to metal- and polymer-recovery from metallized plastic waste using mechanical treatment and subcritical solvents

submitted, in review
 
: Knappich, Fabian; Schlummer, Martin; Mäurer, Andreas; Prestel, Harald

:

Journal of material cycles and waste management 20 (2018), No.3, pp.1541-1552
ISSN: 1438-4957
ISSN: 1611-8227
English
Journal Article
Fraunhofer IVV ()

Abstract
Galvanized or “chromium-plated” plastics are well known to the consumer from the automotive sector and sanitary area. Polymers such as acrylonitrile butadiene styrene (ABS) are typically coated with a layer system of chromium, nickel and copper to obtain the characteristic optical surface and resistance properties. Due to the complex manufacturing process and high quality requirements, the production of these plastic metal composites generates 10–30% of rejects. We, therefore, developed an innovative process cascade for the recovery of both components (metal and polymer) applying established technologies (mechanical pre-treatment, classification, melt filtration, CreaSolv® Process) and were able to obtain ABS regranulate having excellent properties regarding the characteristic values for strength but slight compromises in impact characteristics. Blends with different amounts of virgin ABS, virgin PC and recycled ABS material as well as the pure cases were successfully re-metallized, all of them passing adhesion test, thermal shock resistance and CASS test. The high purity of the recovered materials led to increased redemption prices for metal and polymer by a factor of 6 and 2.5, respectively. Thus, the value added of metallized plastic waste is maximized, revealing a highly positive economic prognosis of a commercial implementation of the developed process—even at moderate scale.

: http://publica.fraunhofer.de/documents/N-490454.html