METHOD OF REGENERATION OF CURED RUBBER WASTE Russian patent published in 1997 - IPC

FIELD: rubber industry and waste disposal. SUBSTANCE: non-disintegrated rubber waste is passed through minimum opening of rolls 1500 660/660, treated to devulcanization rate 4-7 conditional units (ring module), 0.9-2.5 weight parts (per 100 weight parts of waste) of lignosulfonates is added, mixture is rolled for further 10-20 min, 1-3 weight parts of sulfur is added and pressed into standard plate at 170 C for 10 min. Characteristics of regenerate: apparent strength 3.61-6.0 MPa, relative elongation 150-258%, residual elongation 4%. EFFECT: improved performance characteristics. 2 tbl