Bituminous composition solid at ambient temperature
A bituminous composition and a process for the preparation of bituminous mixes including at least one bitumen base, at least one compound of general formula Ar1-R 1 —Ar 2 (I), and at least one compound of general formula R 2 —(NH) n CONH—X—(NHCO) p (NH) n —R′ 2 (II). The composition is used as road binder, notably for the preparation of bituminous mixes.
1. A bituminous composition which is solid at ambient temperature and in a divided form, said bituminous composition comprising at least:
a) a bitumen base,
b) a compound of general formula (I):
Ar1-R 1 —Ar 2 (I)
wherein:
Ar1 and Ar2 represent, independently of each other, an aromatic group comprising from 6 to 20 carbon atoms chosen among a benzene nucleus or a system of condensed aromatic nuclei, said aromatic group being substituted by at least one hydroxyl group and optionally by one or more C 1 -C 20 alkyl groups, and
R 1 represents an optionally substituted hydrocarbon divalent radical, the main chain of which comprises from 6 to 20 carbon atoms and at least one group chosen from the amide, ester, hydrazide, urea, carbamate and anhydride functional groups, and
c) a compound of general formula (II):
R 2 —(NH) n CONH—X—(NHCO) p (NH) n —R′ 2 (II)
wherein:
the R 2 and R′ 2 groups, which are identical or different, represent a hydrocarbon chain comprising from 1 to 22 carbon atoms which is optionally substituted and which optionally comprises one or more heteroatoms, and R 2 can be H,
the X group represents a hydrocarbon chain comprising from 1 to 22 carbon atoms which is optionally substituted and which optionally comprises one or more heteroatoms and
n and p are integers having a value of 0 or 1, independently of each other.
2. The bituminous composition according to claim 1 , which is in the form of blocks or pellets.
3. The bituminous composition as claimed in claim 1 , wherein the compound of general formula (I) is 2′,3-bis[(3-[3,5-di(tert-butyl)-4-hydroxyphenyl]propionyl)]propionohydrazide.
4. The bituminous composition as claimed in claim 1 , wherein the compound of general formula (II) is chosen from compounds of general formula (IIA):
R 2 —CONH—X—NHCO—R′ 2 (IIA)
wherein R 2 and R′ 2 , which are identical or different, represent a hydrocarbon chain comprising from 1 to 22 carbon atoms which is optionally substituted and which optionally comprises one or more heteroatoms, such as N, O or S, and R 2 can be H, and
X represents a hydrocarbon chain comprising from 1 to 22 carbon atoms which is optionally substituted and which optionally comprises one or more heteroatoms, such as N, O or S.
5. The bituminous composition as claimed in claim 4 , wherein the compound of general formula (IIA) is chosen from the compounds C 5 H 11 —CONH—NHCO—C 5 H 11 , C 9 H 19 —CONH—NHCO—C 9 H 19 , C 11 H 23 —CONH—NHCO—C 11 H 23 , C 17 H 35 —CONH—NHCO—C 17 H 35 or C 21 H 43 —CONH—NHCO—C 21 H 43 ; N,N′-ethylenedi(laurylamide) of formula C 11 H 23 —CONH—CH 2 —CH 2 —NHCO—C 11 H 23 , N,N′-ethylenedi(myristylamide) of formula C 13 H 27 —CONH—CH 2 —CH 2 —NHCO—C 13 H 27 , N,N′-ethylenedi(palmitamide) of formula C 15 H 31 —CONH—CH 2 —CH 2 —NHCO—C 15 H 31 or N,N′-ethylenedi(stearamide) of formula C 17 H 35 —CONH—CH 2 —CH 2 —NHCO—C 17 H 35 ; laurylamide of formula C 11 H 23 —CONH 2 , myristylamide of formula C 13 H 27 —CONH 2 , palmitamide of formula C 15 H 31 —CONH 2 or stearamide of formula C 17 H 35 —CONH 2 .
6. The bituminous composition as claimed in claim 5 , wherein the compound of general formula (IIA) is N,N′-ethylenedi(stearamide) of formula C 17 H 35 —CONH—CH 2 —CH 2 —NHCO—C 17 H 35 .
7. The bituminous composition as claimed in claim 1 , wherein the bituminous composition comprises from 0.1 to 10% by weight of one or more compounds of general formula (I), with respect to the total weight of the bituminous composition.
8. The bituminous composition as claimed in claim 1 , wherein the bituminous composition comprises from 0.1% to 10% by weight of one or more compounds of general formula (II), with respect to the total weight of the bituminous composition.
9. The bituminous composition as claimed in claim 1 , wherein it comprises from 80 to 99.8% by weight of one or more bitumen bases.
10. The bituminous composition as claimed in claim 1 , wherein it comprises from 0.05 to 15% of one or more olefinic polymer adjuvants.
11. The bituminous composition as claimed in claim 1 , wherein it comprises:
a) from 80 to 99.8% by weight of one or more bitumen bases,
b) from 0.1 to 10% by weight of one or more additives of general formula (I),
c) from 0.1 to 10% by weight of one or more additives of general formula (II), and
d) optionally, from 0.05 to 15% by weight of one or more olefinic polymer adjuvants,
with respect to the total weight of the bituminous composition.
12. The bituminous composition as claimed in claim 1 , wherein the bitumen base has a penetrability at 25° C., measured according to standard EN 1427, less than or equal to 200 1/10 mm.
13. The bituminous composition as claimed in claim 1 , wherein the bituminous composition has a ring-and-ball softening temperature, measured according to standard EN 1427, of from 80 to 120° C.
14. The bituminous composition as claimed in claim 1 , wherein the bituminous composition has a deformability at 65° C., less than or equal to 50%.
15. The bituminous composition as claimed in claim 1 , comprising 0.65 to 1 weight % of 2′,3-bis[(3-[3,5-di(tert-butyl)-4-hydroxyphenyl]propionyl)]propionohydrazide as the compound of general formula (I) and 1 to 3 weight % of N,N′-ethylenedi(stearamide) as the compound of general formula (II).
16. A bituminous mix comprising:
(i) a bituminous composition, and
(ii) aggregates, and/or inorganic fillers and/or synthetic fillers, wherein the bituminous composition comprises at least:
a) a bitumen base,
b) a compound of general formula (I):
Ar1-R 1 —Ar 2 (I)
wherein:
Ar1 and Ar2 represent, independently of each other, an aromatic group comprising from 6 to 20 carbon atoms chosen among a benzene nucleus or a system of condensed aromatic nuclei, said aromatic group being substituted by at least one hydroxyl group and optionally by one or more C 1 -C 20 alkyl groups, and
R 1 represents an optionally substituted hydrocarbon divalent radical, the main chain of which comprises from 6 to 20 carbon atoms and at least one group chosen from the amide, ester, hydrazide, urea, carbamate and anhydride functional groups,
c) a compound of general formula (II):
R 2 —(NH) n CONH—X—(NHCO) p (NH) n —R′ 2 (II)
wherein:
the R 2 and R′ 2 groups, which are identical or different, represent a hydrocarbon chain comprising from 1 to 22 carbon atoms which is optionally substituted and which optionally comprises one or more heteroatoms, and R 2 can be H,
the X group represents a hydrocarbon chain comprising from 1 to 22 carbon atoms which is optionally substituted and which optionally comprises one or more heteroatoms, and
n and p are integers having a value of 0 or 1, independently of each other.
17. The bituminous mix as claimed in claim 16 , which is a road bituminous mix, a bituminous concrete or a bituminous mastic.
18. A process for the manufacture of bituminous mixes as claimed in claim 16 , said process comprising at least the following steps:
1) heating the aggregates at a temperature ranging from 100° C. to 180° C.,
2) mixing the aggregates with the road binder in a vessel,
3) obtaining bituminous mixes.
19. The process as claimed in claim 18 , wherein at least part of the aggregates originates from recycled bituminous mixes.
20. The process as claimed in claim 18 , which does not comprise a stage of heating the road binder before it is mixed with aggregates.