Plastomer-modified asphalt binders meeting MSCR specifications, asphalt paving materials with such asphalt binders, and methods for fabricating such asphalt binders
View Patent ↗Plastomer-modified asphalt binders meeting MSCR specifications, asphalt paving materials with such asphalt binders, and methods for fabricating such asphalt binders are provided. The asphalt binder contains a base asphalt and a plastomer. If the plastomer has a drop point no greater than about 139° C., the asphalt binder further contains sulfur; sulfur-containing compounds, such as hydrocarbyl polysulfides and thiuram disulfides; phenolic resins; metal oxides; or a combination thereof. The asphalt binder is substantially free of elastomer.
1. An asphalt binder comprising:
a base asphalt; and
a plastomer comprising;
a maleated polypropylene,
a polypropylene homopolymer, or
a combination thereof; and
an additive selected from the group of sulfur, sulfur-containing compounds, phenolic resins, or combinations thereof;
wherein the asphalt binder is substantially free of elastomer; and
wherein the plastomer has a drop point no greater than 139° C.
2. The asphalt binder of claim 1 , wherein the additive comprises sulfur.
3. The asphalt binder of claim 1 , wherein the additive comprises sulfur-containing compounds.
4. The asphalt binder of claim 3 , wherein the sulfur-containing compounds comprise hydrocarbyl polysulfides.
5. The asphalt binder of claim 3 , wherein the sulfur-containing compounds comprise thiuram disulfides.
6. The asphalt binder of claim 1 , wherein the additive comprises phenolic resins.
7. The asphalt binder of claim 1 , wherein the plastomer is present in the asphalt binder in an amount no greater than about 10 wt. % based on a total weight of the asphalt binder.
8. The asphalt binder of claim 1 , wherein the additive is present in the asphalt binder in an amount no greater than about 1 wt. % based on a total weight of the asphalt binder.
9. The asphalt binder of claim 1 , wherein the base asphalt is utilized for paving applications, coating applications, sealant applications, roofing material applications, or adhesive applications.
10. An asphalt paving material comprising:
an asphalt binder comprising:
a base asphalt; and
a plastomer comprising;
a maleated polypropylene,
a polypropylene homopolymer, or
a combination thereof; and
an additive selected from the group of sulfur, sulfur-containing compounds, phenolic resins, or combinations thereof;
wherein the asphalt binder is substantially free of elastomer, and
wherein the plastomer has a drop point no greater than 139° C.; and
an aggregate.
11. The asphalt paving material of claim 10 , wherein the additive comprises sulfur.
12. The asphalt paving material of claim 10 , wherein the additive comprises sulfur-containing compounds.
13. The asphalt paving material of claim 12 , wherein the sulfur-containing compounds comprise hydrocarbyl polysulfides.
14. The asphalt paving material of claim 12 , wherein the sulfur-containing compounds comprise thiuram disulfides.
15. The asphalt paving material of claim 10 , wherein the additive comprises phenolic resins.
16. The asphalt paving material of claim 10 , wherein the additive is present in the asphalt binder in an amount no greater than about 1 wt. % based on a total weight of the asphalt binder.
17. The asphalt paving material of claim 10 , wherein the plastomer is present in the asphalt binder in an amount no greater than about 10 wt. % based on a total weight of the asphalt binder.
18. A method for fabricating an asphalt binder, the method comprising the steps of:
heating a base asphalt to a sufficiently liquid state;
adding an additive selected from the group of sulfur, sulfur-containing compounds, phenolic resins, or combinations thereof to the base asphalt; and
combining the base asphalt, the additive, and a plastomer, the plastomer comprising a maleated polypropylene, a polypropylene homopolymer, or a combination thereof;
wherein the asphalt binder is substantially free of elastomer; and
wherein the plastomer has a drop point no greater than 139° C.