Bituminous composition solid at ambient temperature
A bituminous composition comprising at least one bitumen base, at least one compound of general formula (I): Ar1-R 1 —Ar 2 (I), and at least one compound of general formula (II): R 2 —(NH) n CONH—X—(NHCO) p (NH) n —R′ 2 (II). The invention also concerns a process for the preparation of said bituminous composition.
1. A bituminous composition comprising at least:
a) a bitumen base,
b) 2′,3-bis[(3-[3,5-di(tert-butyl)-4-hydroxyphenyl]propionyl)]propionohydrazide, and
c) N,N′-ethylenedi(stearamide) of formula C 17 H 35 —CONH—CH 2 —CH 2 —NHCO—C 17 H 35 .
2. The bituminous composition as claimed in claim 1 , comprising from 0.1 to 10% by weight of 2′,3-bis[(3-[3,5-di(tert-butyl)-4-hydroxyphenyl]propionyl)]propionohydrazide with respect to the total weight of the bituminous composition.
3. The bituminous composition as claimed in claim 1 , comprising from 0.1% to 10% by weight of N,N′-ethylenedi(stearamide) of formula C 17 H 35 —CONH—CH 2 —CH 2 —NHCO—C 17 H 35 by weight, with respect to the total weight of the bituminous composition.
4. The bituminous composition as claimed in claim 1 , comprising from 80 to 99.8% by weight of one or several bitumen bases, with respect to the total weight of the bituminous composition.
5. The bituminous composition as claimed in claim 1 , comprising:
a) from 80 to 99.8% by weight of one or several bitumen bases,
b) from 0.1 to 10% by weight of 2′,3-bis[(3-[3,5-di(tert-butyl)-4-hydroxyphenyl]propionyl)]propionohydrazide, and
c) from 0.1 to 10% by weight of N,N′-ethylenedi(stearamide) of formula C 17 H 35 —CONH—CH 2 —CH 2 —NHCO—C 17 H 35 ,
with respect to the total weight of the bituminous composition.
6. The bituminous composition as claimed in claim 1 , wherein the bitumen base has a penetrability at 25° C., measured according to standard EN 1426, lower than or equal to 200 1/10 mm.
7. The bituminous composition as claimed in claim 1 , having a penetrability at 25° C., measured according to standard EN 1426, lower than or equal to 40 1/10 mm.
8. The bituminous composition as claimed in claim 1 , having a ring-and-ball softening point, measured according to standard EN 1427, of from 80 to 120° C.
9. The bituminous composition as claimed in claim 1 , having a deformability at 65° C. lower than or equal to 50%.
10. The bituminous composition as claimed in claim 1 , having a viscosity at 160° C., V160, measured according to standard EN 13702, lower than or equal to 500 mPa·s.
11. A process for the preparation of a bituminous composition according to claim 1 , said process comprising contacting, at a temperature ranging from 70° C. to 220° C., the bitumen base with 2′,3-bis[(3-[3,5-di(tert-butyl)-4-hydroxyphenyl]propionyl)]propionohydrazide and N,N′-ethylenedi(stearamide) of formula C 17 H 35 —CONH—CH 2 —CH 2 —NHCO—C 17 H 35 .
12. The process according to claim 11 , which comprises the following steps:
a) the introduction of the bitumen base in a reactor equipped with mixing means and its heating at a temperature ranging from 70° C. to 220° C.,
b) the simultaneous or successive additions of 2′,3-bis[(3-[3,5-di(tert-butyl)-4-hydroxyphenyl]propionyl)]propionohydrazide and N,N′-ethylenedi(stearamide) of formula C 17 H 35 —CONH—CH 2 —CH 2 —NHCO—C 17 H 35 , and
c) the mixture of the bituminous composition at a temperature ranging from 70° C. to 220° C., until obtaining a homogenous composition.