Properties of elastomeric composition filled with ground vulcanizate

Recycling rubber waste and improving of the efficiency of the secondary elastomeric materials use is an important technical and economic challenge. Vulcanized rubber waste is the most difficult to recycle. One of the promising ways of recycling waste vulcanized rubber is their grinding and subsequent use of the obtained powder as a filler in elastomeric compositions. The influence of the nature of ground vulcanizate (GV) on the properties of elastomeric compositions based on nitrile-butadiene rubber is studied in the paper. GV of two types are used for the investigation. The first type is tire based on non-polar rubbers of general purpose. The second type is obtained from wastes of production of industrial rubber article (IRA) based on polar nitrile-butadiene rubber. Particle size of GV’s fraction used in study is 0.63–1.00 mm. GV was input in unfilled model composition based on nitrile-butadiene rubber in dosages 50, 100, 150 and 200 phr. It is found that Mooney viscosity of the elastomeric compositions filled with GV of IRA wastes increases more than using the tire GV. The rate of stress relaxation in the uncured compositions are not depend on the nature of GV. The cure optimum of the composition containing GV-based on polar rubber smaller than GV based on general purpose rubbers is used. The influence of the ground rubber type and dosage on the cure network structure are investigated. the density of cross-linking of the vulcanizates decreases with increasing dosage GV. Vulcanizates filled with GV derived from IRA have higher cross-linking density than those containing tire GV.