Bituminous compositions based on phosphoric derivatives

Abstract

The invention relates to a package of performance additives for bitumen or bituminous compositions including an acidic adjuvant and a H 2 S scavenger chosen from organic or inorganic copper salts. The invention also relates to the use of said H 2 S scavenger in order to reduce the H 2 S emissions of bitumen or of a bituminous composition treated with the acidic adjuvant. The invention additionally relates to a process for the preparation of a bituminous composition. The preparation process according to the invention makes it possible to obtain bitumen/crosslinked polymer compositions having better mechanical and dynamic properties in comparison with the bitumen/crosslinked polymer compositions of the prior art, while substantially reducing the releases of hydrogen sulfide (H 2 S).

1 . A package comprising:
 (1) a bituminous composition,   (2) an acidic adjuvant chosen from phosphoric acids, polyphosphoric acids and their mixtures, and   (3) from 0.05% to 5% by weight of a H 2 S scavenger comprising copper oxides, the percentages being calculated with respect to the total weight of the bituminous composition.   
     
     
         2 . The package as claimed in  claim 1 , which further comprises at least one H 2 S scavenger selected from the group consisting of copper hydroxides, copper hydrates, copper hydroxy carbonates, copper carbonates, copper carboxylates, copper nitrates and copper phosphates and their mixtures. 
     
     
         3 . The package as claimed in  claim 1 , wherein the ratio by weight of the H 2 S scavenger with respect to the acidic adjuvant is between 1:300 and 100:1. 
     
     
         4 . The package as claimed in  claim 3 , wherein the ratio by weight of the H 2 S scavenger with respect to the acidic adjuvant is between 1:10 and 10:1. 
     
     
         5 . The package as claimed in  claim 4 , wherein the ratio by weight of the H 2 S scavenger with respect to the acidic adjuvant is between 1:10 and 5:1. 
     
     
         6 . The package as claimed in  claim 1 , which further comprises one or more inert solvents. 
     
     
         7 . The package as claimed in  claim 6 , wherein the solvent is a mineral oil. 
     
     
         8 . The package as claimed in  claim 6 , wherein the amount of solvent is between 1% and 95% by weight, with respect to the total weight of the acidic adjuvant and the H 2 S scavenger. 
     
     
         9 . The package as claimed in  claim 8 , wherein the amount of solvent is between 10% and 90% by weight, with respect to the total weight of the acidic adjuvant and the H 2 S scavenger. 
     
     
         10 . The package as claimed in  claim 9 , wherein the amount of solvent is between 20% and 80% by weight, with respect to the total weight of the acidic adjuvant and the H 2 S scavenger. 
     
     
         11 . The package as claimed in  claim 10 , wherein the amount of solvent is between 40% and 60% by weight, with respect to the total weight of the acidic adjuvant and the H 2 S scavenger. 
     
     
         12 . The package as claimed in  claim 1 , wherein it consists solely of the bitumen or bituminous composition, the H 2 S scavenger and the acidic adjuvant. 
     
     
         13 . The package as claimed in  claim 1 , wherein the bituminous composition, the acidic adjuvant and the H 2 S scavenger are packed separately. 
     
     
         14 . The package as claimed in  claim 1 , comprising from 90% to 99.3% by weight of bitumen, with respect to the total weight of the bituminous composition. 
     
     
         15 . A process for preparation of a bitumen or a bituminous composition, said process comprising a stage of treatment of a bitumen or a bituminous composition with:
 from 0.05% to 5% by weight of a H 2 S scavenger selected from the group consisting of copper oxides and their mixtures with a copper compound wherein the copper compound is selected from the group consisting of copper hydroxides, copper hydrates, copper hydroxy carbonates, copper carbonates, copper carboxylates, copper nitrates, copper phosphates and their mixtures, and   an acidic adjuvant chosen from phosphoric acids, polyphosphoric acids and their mixtures,   
       the percentages being calculated with respect to the total weight of the bituminous composition. 
     
     
         16 . The process as claimed in  claim 15 , wherein the H 2 S scavenger and the acidic adjuvant are used separately. 
     
     
         17 . The process as claimed in  claim 15 , wherein the H 2 S scavenger and the acidic adjuvant are directly added to the bituminous composition in the form of a package of additives. 
     
     
         18 . A process for preparation of a bitumen/crosslinked polymer composition comprising employing a sulfur-donating coupling agent and a stage of treatment of a bitumen or a bituminous composition with:
 from 0.05% to 5% by weight of a H 2 S scavenger selected from the group consisting of copper oxides and their mixtures with a copper compound wherein the copper compound is selected from the group consisting of copper hydroxides, copper hydrates, copper hydroxy carbonates, copper carbonates, copper carboxylates, copper nitrates, copper phosphates and their mixtures, and   an acidic adjuvant chosen from phosphoric acids, polyphosphoric acids and their mixtures, the percentages being calculated with respect to the total weight of the bitumen/crosslinked polymer composition.   
     
     
         19 . The process as claimed in  claim 18 , wherein the proportion of acidic adjuvant is between 0.05% and 15% by weight, the percentages by weight being calculated with respect to the total weight of the bitumen/crosslinked polymer composition. 
     
     
         20 . The process as claimed in  claim 18 , wherein the proportion of H 2 S scavenger is between 0.1% and 1% by weight, the percentages by weight being calculated with respect to the total weight of the bitumen/crosslinked polymer composition.