Modified asphalt compositions containing dialkyl polysulfides
Modified asphalt compositions and methods of making same. The modified asphalt compositions include asphalt, a crosslinkable polymer, and a dialkyl polysulfide. The methods of making the compositions include blending a mixture of asphalt, a crosslinking polymer, and a dialkyl polysulfide, such as at a temperature of about 100-300° C.
1. A modified asphalt composition comprising:
asphalt;
a crosslinkable polymer; and
a dialkyl polysulfide, wherein the dialkyl polysulfide comprises a dialkyl octasulfide.
2. The composition of claim 1 , wherein the asphalt is included in the modified asphalt composition in an amount of about 5-85 wt. % of the modified asphalt composition.
3. The composition of claim 1 , wherein the crosslinkable polymer comprises an alkene monomer.
4. The composition of claim 3 , wherein the alkene monomer comprises at least two alkene groups.
5. The composition of claim 1 , wherein the crosslinkable polymer comprises a styrene monomer.
6. The composition of claim 1 , wherein the crosslinkable polymer comprises an alkene monomer and a styrene monomer.
7. The composition of claim 1 , wherein the crosslinkable polymer is included in the modified asphalt composition in an amount of about 0.5-20 wt. % of the asphalt.
8. The composition of claim 1 , wherein the dialkyl polysulfide is included in the modified asphalt composition in an amount of about 0.01-2.0 wt. % of the modified asphalt composition.
9. The composition of claim 1 , wherein the dialkyl polysulfide is an additive that is not originally present in the asphalt itself.
10. The composition of claim 1 , wherein:
the asphalt is included in the modified asphalt composition in an amount of about 5-85 wt. % of the modified asphalt composition;
the crosslinkable polymer is included in the modified asphalt composition in an amount of about 0.5-20 wt. % of the asphalt;
the dialkyl polysulfide is included in the modified asphalt composition in an amount of about 0.01-2.0 wt. % of the modified asphalt composition; and
the dialkyl polysulfide is an additive that is not originally present in the asphalt itself.
11. The composition of claim 10 , wherein the crosslinkable polymer comprises an alkene monomer.
12. The composition of claim 11 , wherein the crosslinkable polymer further comprises a styrene monomer.
13. The composition of claim 1 , wherein the composition further comprises a fluxing agent.
14. The composition of claim 13 , wherein the composition comprises the fluxing agent in an amount of about 0-80 wt. % of the modified asphalt composition.
15. A method of making a modified asphalt composition as recited in claim 1 , the method comprising blending a mixture of asphalt, a crosslinkable polymer, and a dialkyl polysulfide.
16. The method of claim 15 , wherein the mixture is blended at a temperature of about 100-300° C.
17. The method of claim 15 , wherein:
the asphalt is included in the modified asphalt composition in an amount of about 5-85 wt. % of the modified asphalt composition;
the crosslinkable polymer is included in the modified asphalt composition in an amount of about 0.5-20 wt. % of the asphalt;
the dialkyl polysulfide is included in the modified asphalt composition in an amount of about 0.01-2.0 wt. % of the modified asphalt composition;
the dialkyl polysulfide is an additive that is not originally present in the asphalt itself; and
the blending comprises adding the dialkyl polysulfide in a solution form to a pre-mixture of the asphalt and the crosslinkable polymer.
18. The method of claim 15 , wherein the blending comprises adding the dialkyl polysulfide in a solution form to a pre-mixture of the asphalt and the crosslinkable polymer.
19. The method of claim 15 , wherein:
the crosslinkable polymer comprises an alkene monomer; and
the crosslinkable polymer further comprises a styrene monomer.