RUBBER MIX FOR PRODUCTION OF RAIL AND SLEEPER PADS FOR DAMPING RAIL BRACES Russian patent published in 2008 - IPC C08L9/00 C08L9/06 C08K13/02 C08K3/04 C08K3/06 C08K3/22 C08K3/36 C08K5/01 C08K5/09 C08K5/18 C08K5/40 C08K5/46 

FIELD: chemistry.

SUBSTANCE: rubber mix consists of (mass part): styrol-butadiene rubber containing 22-25 mass % of styrol - 60-70, synthetic cis-1,4-polyisoprene rubber - 5-10, divinyl rubber containing 87 to 95% of cis-1.4 units - 5-10, styrol-butadiene rubber containing 58-68% of bound styrol and alpha-methylstyrol - 15-30, vulcanising group (sulfur - 0.5-1.0, tetramethylthiuramdisulfide - 0.5-1.0, N,N'-dithiodimorpholine - 1-2, stearic acid - 0.9-1.5, zinc oxide - 4-5), N-phenyl-N'-isopropyl-n-phenylenediamine - 1-2, polymerised 2,2,4-trimethyl-1,2-dihydrochinoline - 1-2, oil asphalt - 4-5, kaoline - 20-40, carbon black with specific geometrical surface of 20-26 m²/g - 30-50, and fine settled silicon dioxide - 20-25.

EFFECT: higher rigidity and friction rate and longer working life.

3 tbl