As the widely used commercial insulation products, the crosslinked acrylonitrile-butadiene rubber (NBR)/poly (vinyl chloride) (PVC) blends could serve various walks of life. However, due to the crosslinked nature, the wasted NBR/PVC composites cannot be reproduced and are usually directly landfill or incineration in the environment, which causes severe air and soil pollution as well as colossal energy waste. Herein, we reported a cost-efficient and effective method to recycle the waste NBR/PVC via solid-state shear milling (S3M) technology to prepare the secondary masterbatch and a reproduced WNPP/NBR composite with acceptable mechanical properties. Evidenced by the decreased gel fraction from 68.25% to 53.10%, it was demonstrated that the S3M technology could selectively destroy the crosslinking C–S bonds in waste NBR/PVC insulation materials powder (WNPP), and the as-prepared partially decrosslinked WNPP could form a sound interface with raw NBR. Accordingly, the elongation at break and tensile strength of the final samples increased from 53.83% to 84.49% and 3.5 to 4.0 MPa, respectively. Moreover, since the C–C backbone was not destroyed, the excellent thermal property of NBR was retained to realize the reproduction procedure. Aiming at solving the severe environmental pollution and energy waste of WNPP, this research not only put forward an eco-friendly strategy for the reuse of WNPP, but also expanded the mechanochemical application scope in recycling solid wastes.
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