FIELD: chemistry.
SUBSTANCE: asphalt-rubber composition contains asphalt, rubber crumbs and a devulcanising agent. The devulcanising agent used is nanosized silica sol. Components are in the following ratio (pts.wt): asphalt 100, rubber crumbs 15-20, nanosized silica sol 0.05-0.15. The asphalt-rubber composition is obtained by mixing starting components in a sealed reactor at temperature 180-230°C for 80-120 minutes. The method enables to obtain an asphalt-rubber composition with rubber crumbs maximally dissolved in asphalt with minimum destruction of the rubber backbone chain, which improves operating characteristics. The method of preparing the composition is simple, safe, cheap and highly efficient.
EFFECT: composition has a system of improved properties, particularly elasticity.
2 cl, 1 tbl, 4 ex
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