METHOD OF PRODUCING BITUMEN-POLYMER COMPOSITIONS Russian patent published in 2012 - IPC C08L95/00 C08J3/20 C08J11/00 

FIELD: chemistry.

SUBSTANCE: bitumen-polymer composition is prepared from polymer crumbs - butadiene styrene thermoplastic elastomer DST-30 and wastes from production of synthetic rubber and latex with Defo hardness of 2700, butimen, mineral filler - chalk, resin 101 K and industrial oil wastes. First, the polymers are crushed to particle size d_eq≤0.018 m and molten BNK 90/30 bitumen is prepared. The crushed polymers, molten, chalk, resin 101 K and industrial oil wastes are fed to rollers which are preheated to temperature 50-80°C. The mixing process is carried out until achieving complete homogenisation. The specific time of mixing is 3.5-5.5 minutes. The composition is prepared with the following ratio of components in wt %: bitumen BNK 90/30 41.0, butadiene styrene thermoplastic elastomer DST-30 - 24.0, and wastes from production of synthetic rubber and latex with Defo hardness of 2700 - 23.0, mineral filler - chalk - 9.0, resin 101 K - 1.0, industrial oil wastes -2.0.

EFFECT: reduced time energy and time spent on producing the composition; the obtained composition has improved physical and mechanical properties.

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