METHOD FOR PREPARING A BITUMINOUS BASIS, A BITUMINOUS BASIS AND ITS APPLICATION

摘要

1. A method of preparing a bitumen base, characterized in that it includes the following main stages:! a) bitumen is introduced into a tank equipped with a mixing device and bitumen is heated to a temperature of 120 to 300 ° C,! b) at least one chemical blowing agent is introduced into the tank and the resulting mixture is mixed, said chemical blowing additive having the following general formula! ! where Ar1 and Ar2, independently of one another, are a benzene ring or a system of fused aromatic rings having from 6 to 20 carbon atoms substituted with at least one hydroxyl group, and R is optionally substituted with respect to the hydroxyl group (or groups) Ar1 and / or Ar2 is a divalent radical, the main chain of which contains from 6 to 20 carbon atoms and at least one amide and / or ester group. ! 2. The method according to claim 1, characterized in that Ar1 and Ar2 are substituted by at least one alkyl group with 1-10 carbon atoms, preferably in one or more ortho-position (s) with respect to the hydroxyl group (or groups) of Ar1 and / or Ar2. ! 3. The method according to any one of claims 1 and 2, characterized in that -R- is in the para position with respect to the hydroxyl group Ar1 and / or Ar2. ! 4. The method according to any one of claims 1 and 2, characterized in that Ar1 and Ar2 are 3,5-dialkyl-4-hydroxyphenyl groups, preferably 3,5-di tert-butyl-4-hydroxyphenyl groups. ! 5. The method according to claim 1, characterized in that 2 ', 3-bis [[3- [3,5-di-tert-butyl-4-hydroxyphenyl] propionyl]] propionohydrazide. ! 6. The method according to any one of claims 1 and 2, characterized in that the purge additive is from 0.1 to 5.0% by weight of bitumen. ! 7. The method according to any one of claims 1 and 2, characterized