Method for preparing bitumen base

C - Chemistry – Metallurgy – 08 – L

Patent

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Details

C08L 95/00 (2006.01) C08K 5/134 (2006.01) C08K 5/20 (2006.01) C10C 3/04 (2006.01)

Patent

CA 2616684

The invention concerns a method for preparing a bitumen base, including the following essential steps: a) introducing a bitumen in a container equipped with mixing means, and bringing the bitumen to a temperature of 120°C to 300°C; b) introducing at least one chemical blowing additive into the container, and mixing, said chemical blowing additive being of general formula Ar1-R-Ar2 (I) wherein Ar1 and Ar2 independently of each other represent a benzene ring or a system of condensed aromatic rings of 6 to 20 carbon atoms, substituted by at least one hydroxyl group, and R represents an optionally substituted divalent radical, whereof the main chain comprises 6 to 20 carbon atoms and at least one amide and/or ester group. The invention also concerns a bitumen base obtained by implementing said method, as well as the use of such bitumen bases in road surfacing and industrial applications.

La présente invention concerne un procédé de préparation d'une base bitume, comprenant les étapes essentielles suivantes : a) on introduit un bitume dans un récipient équipé de moyens de mélange, et on porte le bitume à une température de 120~C à 300~C, b) on introduit au moins un additif de soufflage chimique dans le récipient, et on mélange, ledit additif de soufflage chimique possédant la formule générale suivante : Ar1-R-Ar2 (I) où Ar1 et Ar2 représentent indépendamment l'un de l'autre un noyau benzène ou un système de noyaux aromatiques condensés de 6 à 20 atomes de carbones, substitués par au moins un groupe hydroxyle, et R représente un radical divalent éventuellement substitué, dont la chaîne principale comprend de 6 à 20 atomes de carbone et au moins un groupe amide et/ou ester. L'invention concerne également une base bitume obtenue lors de la mise en AEuvre de ce procédé, ainsi que l'utilisation de telles bases-bitumes dans des applications routières et industrielles.

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