Recovered carbon black; material characterization and in-rubber performance: Sustainable future of tire manufacturing

Project progress (in years): 1 10 100 100 200 300 G' / K P a

Shear strain amplitude/ %

Ref PCT500 PCT550 Filler-filler interaction Filler-polymer interaction 0 300 600 900 0 4 8 12 S tr ess/ MP a Strain/ % Ref PCT500 PCT550 0 10 20 30 40 Ha rdnes s/ Sho re A Non-volatiles

Recovered carbon black; material characterization and

in-rubber performance

Cluster 06: Composites, project T16005a

University of Twente Department of Elastomer Technology and Engineering,

7522LW Enschede, The Netherlands.

06.09

Sustainable future of tire manufacturing

A. Anjum, H. Gojzewski, W. Dierkes, A. Blume

University of Twente, Enschede, The Netherlands

Contact: a.anjum@utwente.nl

In

troduction

• RCB exhibits relatively dense structure with minimal polymer chain anchoring possibilities.

• RCB contains impurities, both volatiles and non-volatiles, deposited on the surface.

• Deposited impurities result in reduced surface activity as well as surface smoothness.

• Initial trails show improvement in in-rubber performance with increasing temperature. • Study will be continued with varying pyrolysis process parameters.

Ma

teria

l pr

operties

In

-rubber perf

orm

ance

Morphology Surface roughness

PCT500 Ref 0 50 100 150 200 -4 0 4 8 H ei ght / nm Section length/ nm N660_200nm 0 50 100 150 200 -4 0 4 8 Section length/ nm PCT500_200nm 0 50 100 150 200 -4 0 4 8 Section length/nm PCT550_200nm Ref PCT500 PCT550

Rubber chain anchoring

Higher filler-polymer

interactions Impurity depositionsLower surface area

for filler-polymer interactions Better physical polymer-filler Higher roughness adhesion

Smooth surface

Conclus

ion

Carbon black is widely used as a reinforcing filler in tire industry. This project aims to recover high quality carbon black from used tires using a novel pyrolysis process. The influence of process temperature on the recovered carbon black(RCB) properties was studied. Pyrolysis was carried out using passenger car tire (PCT) feedstock at temperatures of 500°C (PCT500) and 550°C (PCT550). Material properties and in-rubber performance were compared to a reference carbon black commonly used in tires.

Carbon Silicon Oxygen Zinc sulfur Elemental analysis Volatiles Hardness Ref PCT500 PCT550