Anti-ageing additives for bitumen
The invention relates to an additive composition comprising primary anti-oxidants and a secondary anti-oxidant, wherein the primary anti-oxidants are a phenyl phosphite and 3,3′-thiodipropionic acid dioctadecylester, and wherein the secondary anti-oxidant is epoxidized soybean oil. The invention additionally relates a bituminous composition comprising primary anti-oxidants and a secondary anti-oxidant, wherein the primary anti-oxidants are a phenyl phosphite and 3,3′-thiodipropionic acid dioctadecylester; and wherein the secondary anti-oxidant is epoxidized soybean oil. The invention also relates to an asphalt composition comprising the bituminous composition with resistance to short-term and long-term chemical ageing. The invention further relates to the use of an additive composition to reduce short-term and long-term chemical ageing of a bituminous composition.
1 . A bituminous composition comprising primary anti-oxidants and a secondary anti-oxidant, wherein the primary anti-oxidants are a phenyl phosphite and 3,3′-thiodipropionic acid dioctadecylester; and wherein the secondary anti-oxidant is epoxidized soybean oil; and wherein each of the primary anti-oxidants and the secondary anti-oxidant is present at range of from 0.05% w/w to 2% w/w with respect to the bituminous composition.
2 . The bituminous composition according to claim 1 , wherein the phenyl phosphite is selected from tris (2,4-ditert butyl) phenyl phosphite and tris phenyl phosphite.
3 . The bituminous composition according to claim 1 , wherein each of the primary anti-oxidants and the secondary anti-oxidant is present at range of from 0.15% w/w to 1.75% w/w with respect to the bituminous composition.
4 . An asphalt composition comprising the bituminous composition of claim 1 .