METHOD TO PREPARE RUBBER MODIFIED BITUMEN Russian patent published in 2012 - IPC C08L95/00 C08L17/00 C08J3/20 

FIELD: construction.

SUBSTANCE: method includes preparation of a mixture of bitumen, rubber granules and a plasticiser. The mixture composition additionally includes a maleic anhydride. The plasticiser is vegetable oil. Components in the composition are used at the following ratio, wt %: rubber granules - 12.0-15.0; plasticiser - 5.0-20.0; maleic anhydride - 0.3-0.5; bitumen - balance. In process of composition preparation the vegetable oil is placed into a mixer's reservoir and heated up to the temperature of 120°C. Then bitumen is added to it, preferably, in a melted state. After their mixing, rubber granules are added into the mixer. While mixing, the produced mix is heated up to the temperature of 170°C, which is maintained until the end of the composition preparation. The operation of mixture mixing with rubber granules is carried out for at least an hour. Then maleic anhydride is added to the mixture, and operation of produced mix mixing is carried out for another half an hour at least.

EFFECT: method provides for the possibility to produce a rubber modified bitumen with higher values of elasticity maintained under severe climatic conditions under increased mechanical loads.

4 cl, 1 tbl, 7 ex