Method for preparing an improved bitumen by addition of...

C - Chemistry – Metallurgy – 08 – L

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C08L 95/00 (2006.01) C08J 3/20 (2006.01) C08J 3/24 (2006.01) C08K 3/32 (2006.01) C08L 23/00 (2006.01) C08L 45/00 (2006.01) C08L 47/00 (2006.01)

Patent

CA 2653629

Methods are provided for preparing a bitumen product having improved properties for use in asphalt road paving. In a preferred embodiment, polyphosphoric acid is added to heated bitumen and stirred for a period of time. After addition of the polyphosphoric acid, one or more sulfur-crosslinkable elastomers and one or more sulfur donor coupling agents is added to the heated bitumen and mixed. The polyphosphoric acid, sulfur-crosslinkable elastomers and sulfur donor coupling agents may also be added to separate quantities of bitumen, and the bitumens may be combined prior to use to obtain a final bitumen product having the desired characteristics.

La présente invention concerne des méthodes d'élaboration d'un bitume dont les propriétés sont améliorées pour application au pavage de routes en asphalte. Dans un mode d'application préféré, de l'acide polyphosphorique est ajouté à du bitume chaud et agité pendant une durée déterminée. Après ajout de l'acide polyphosphorique, un ou plusieurs élastomères sulfurés réticulables et un ou plusieurs agents de couplage donneurs de soufre sont ajoutés au bitume chauffé, avant que le tout ne soit mélangé. L'acide polyphosphorique, les élastomères sulfurés réticulables et les agents de couplage donneurs de soufre peuvent également être ajoutés à des fractions séparées du bitume, et lesdites fractions peuvent être combinées avant utilisation pour obtenir un bitume final présentant les caractéristiques recherchées.

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