Rubber De-vulcanization Technologies

Rubber De-vulcanization Technologies

Rubber (post-consumer and post-industrial) scrap is a sizeable component of the total solid waste. The majority of such scrap derives from the transportation industry (tires of automobiles, trucks, off-road vehicles, and motorcycles); but other sources of rubber waste include clothing, footwear, gaskets, and furniture.

In 2020, the United States generated 9.7 million metric tons (mmt) of rubber waste, out of which 5.5 mmt were landfilled (55%), 2.9 mmt were combusted for energy recovery (27%), and only 2.1 mmt were recycled (17%). Recycling rubber waste is challenging, and efforts in improving related policies and technologies continue to evolve to increase sustainability and the circularity of the rubber industry.

As most rubber is used in tires, all of the research on de-vulcanization targets waste tires made of natural and styrene-butadiene rubbers (NR and SBR), with the most common being sulfur vulcanized. Considering the importance of adopting a circular economy, rubber de-vulcanizate applications concentrate on how de-vulcanized rubber can be compounded with different polymeric matrices to develop eco-sustainable polymer blends with suitable physical properties.