Rejuvenating compounds in high performance asphalt compositions with high recycled content

Patent metadata

Field	Value
Publication number	US-2021284574-A1
Application number	US-201816604780-A
Country	US
Kind code	A1
Filing date	Apr 12, 2018
Priority date	Apr 12, 2017
Publication date	Sep 16, 2021
Grant date	—

Abstract

Described herein is a rejuvenated asphalt and a method of rejuvenating asphalt comprising mixing a rejuvenator, bitumen, and aggregate to obtain an asphalt mixture, wherein the rejuvenator is present in an amount ranging from about 0.1-40 wt % by weight of the bitumen, and wherein at least 35 wt % of the bitumen is derived from recycled asphalt content. The rejuvenated asphalt provides desirable performance.

First claim

1 .- 5 . (canceled)

6 . A method, comprising:
mixing a rejuvenator, bitumen, and aggregate to obtain an asphalt mixture, wherein the rejuvenator comprises 0.1-40 wt % by weight of the bitumen, wherein at least 35 wt % of the bitumen is derived from recycled asphalt content; and wherein the asphalt mixture achieves a mixture Tg of 0° C. or lower, more preferably −5° C. or lower, more preferably −10° C. or lower, more preferably −15° C. or lower, more preferably −20° C. or lower, and more preferably −25° C. or lower.

7 . The method of claim 6 wherein the rejuvenator is a polymerized oil.

8 . The method of claim 7 , wherein the polymerized oil is derived from a biorenewable oil source.

9 . The method of claim 7 , wherein the polymerized oil is polymerized using a sulfurization technique.

10 .- 11 . (canceled)

12 . The method of claim 6 , wherein the recycled asphalt content has been recycled more than once.

13 .- 19 . (canceled)

20 . The method of claim 6 , wherein 100 wt % of bitumen is derived from recycled asphalt content.

21 . The method of claim 6 , wherein the recycled asphalt content is either recycled asphalt pavement or recycled asphalt shingles or asphalt resulting from a solvent de-asphalting process.

22 .- 24 . (canceled)

25 . The method of claim 6 , wherein the recycled asphalt content comes from pavement treated with warm mix, antistrip, emulsifier, and/or wax additives.

26 .- 28 . (canceled)

29 . Use of the asphalt mixture made in accordance with claim 6 for roofing applications.

30 . A rejuvenated asphalt, comprising:
a rejuvenator, bitumen, and aggregate, wherein the rejuvenator is present in an amount ranging from about 0.1-40 wt % by weight of the bitumen, wherein at least 35 wt % of the bitumen is derived from recycled asphalt content.

31 . The asphalt of claim 30 , wherein the rejuvenator is a polymerized oil.

32 .- 42 . (canceled)

43 . The asphalt of claim 30 , wherein 100 wt % of bitumen is derived from recycled asphalt content.

44 .- 46 . (canceled)

47 . The asphalt of claim 30 , wherein the rejuvenator has an increase in 60° C. viscosity increase of 300% or less after aging at 100° C. in the Pressure Aging Vassal for 20 hrs at 2.1 MPa air pressure, compared to the unaged rejuvenator.

48 . The asphalt of claim 30 , wherein the rejuvenator replenishes the resin fraction and has an oxidation induction time of 15 minutes or longer at 130° C.

49 . The asphalt of claim 30 , wherein the rejuvenator replenishes the resin fraction and has an increase in 60° C. viscosity increase of 300% or less after aging at 100° C. in the Pressure Aging Vassal for 20 hrs at 2.1 MPa air pressure, compared to the unaged rejuvenator.

50 . The asphalt of claim 30 , wherein the rejuvenator has a Hildebrandt solubility parameter of about 6 to about 12 and has an oxidation induction time of 15 minutes or longer at 130° C.

51 . The asphalt of claim 30 , wherein the rejuvenator has a Hildebrandt solubility parameter of about 6 to about 12 and has an increase in 60° C. viscosity increase of 300% or less after aging at 100° C. in the Pressure Aging Vassal for 20 hrs at 2.1 MPa air pressure, compared to the unaged rejuvenator.

52 . The asphalt of claim 30 , wherein the rejuvenator consists of a polymerized oil and replenishes the resin fraction and has an oxidation induction time of 15 minutes or longer at 130° C.

53 . The asphalt of claim 30 , wherein the rejuvenator consists of a polymerized oil and replenishes the resin fraction and has an increase in 60° C. viscosity increase of 300% or less after aging at 100° C. in the Pressure Aging Vassal for 20 hrs at 2.1 MPa air pressure, compared to the unaged rejuvenator.

54 . The asphalt of claim 30 , wherein the rejuvenator consists of a polymerized oil and has a Hildebrandt solubility parameter of about 6 to about 12 and has an oxidation induction time of 15 minutes or longer at 130° C.

55 . The asphalt of claim 30 , wherein the rejuvenator consists of a polymerized oil and has a Hildebrandt solubility parameter of about 6 to about 12 and has an increase in 60° C. viscosity increase of 300% or less after aging at 100° C. in the Pressure Aging Vassal for 20 hrs at 2.1 MPa air pressure, compared to the unaged rejuvenator.

Assignees

• Cargill Inc

Inventors

• Kurth Todd
• Nivens Scott
• Stevermer Christopher
• Sylvester Anthony Joseph
• Tabatabaee Hassan

Classifications

• C08L2555/34

  Recycled or waste materials, e.g. reclaimed bitumen, asphalt, roads or pathways, recycled roof coverings or shingles, recycled aggregate, recycled tires, crumb rubber, glass or cullet, fly or fuel ash, or slag · CPC title

• C08L2555/22

  Asphalt produced above 140°C, e.g. hot melt asphalt · CPC title

• C08L95/00

  Compositions of bituminous materials, e.g. asphalt, tar, pitch · CPC title

• C08L91/00

  Compositions of oils, fats or waxes; Compositions of derivatives thereof · CPC title

• C04B26/26 Primary

  Bituminous materials, e.g. tar, pitch {(C08L95/00 takes precedence)} · CPC title