WO2011047032A2 - Crumb rubber modified asphalt with improved stability - Google Patents

Crumb rubber modified asphalt with improved stability Download PDF

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Publication number
WO2011047032A2
WO2011047032A2 PCT/US2010/052485 US2010052485W WO2011047032A2 WO 2011047032 A2 WO2011047032 A2 WO 2011047032A2 US 2010052485 W US2010052485 W US 2010052485W WO 2011047032 A2 WO2011047032 A2 WO 2011047032A2
Authority
WO
WIPO (PCT)
Prior art keywords
asphalt
crumb rubber
mineral acid
gtr
modified asphalt
Prior art date
Application number
PCT/US2010/052485
Other languages
French (fr)
Other versions
WO2011047032A3 (en
Inventor
Jean-Valery Martin
Original Assignee
Innophos, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Innophos, Inc. filed Critical Innophos, Inc.
Priority to BR112012008819A priority Critical patent/BR112012008819A2/en
Priority to EP10824011.0A priority patent/EP2488587B1/en
Priority to DK10824011T priority patent/DK2488587T3/en
Priority to ES10824011.0T priority patent/ES2532431T3/en
Priority to PL10824011T priority patent/PL2488587T3/en
Priority to CA2780744A priority patent/CA2780744C/en
Priority to MX2012004427A priority patent/MX337658B/en
Publication of WO2011047032A2 publication Critical patent/WO2011047032A2/en
Publication of WO2011047032A3 publication Critical patent/WO2011047032A3/en

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L19/00—Compositions of rubbers not provided for in groups C08L7/00 - C08L17/00
    • C08L19/003—Precrosslinked rubber; Scrap rubber; Used vulcanised rubber
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L95/00—Compositions of bituminous materials, e.g. asphalt, tar, pitch
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/32—Phosphorus-containing compounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/49—Phosphorus-containing compounds
    • C08K5/51—Phosphorus bound to oxygen

Definitions

  • Asphalt is used for a variety of purposes, including especially use in asphalt road paving systems and in roofing materials.
  • the availability of asphalt materials has been reduced in recent years, while the cost of these materials has been increasing. For these and other reasons, there is great interest in finding ways to extend the useful life of asphalt containing products.
  • asphalt road pavement and roofing materials may be exposed to a wide variety of weather conditions, including temperatures from below freezing to 100°F or more. At colder temperatures, asphalt can become brittle and crack, while at higher temperatures, asphalt can permanently deform, for example by rutting in road pavements. Therefore, modifications that extend or improve the properties of asphalt in cold or hot conditions are also desirable.
  • GTR ground tire rubber
  • the mixing of GTR in asphalt or bitumen typically can lead to a heterogeneous blend with a liquid part and a solid material.
  • the solid material settles when agitation of the GTR/asphalt mixture is stopped.
  • the solid material is primarily carbon black, which has a significant negative impact on the workability of the GTR modified asphalt.
  • the solid material mainly affects the viscosity and storage stability of the GTR modified asphalt.
  • the use of GTR in asphalt has been limited to some specific processes requiring special equipment. This can significantly increase the cost of pavement produced using the GTR modified asphalt.
  • the present invention relates to a method for producing a crumb rubber modified asphalt comprising the steps of: a) heating a pre-selected quantity of asphalt to a temperature of between about 325°F to 550°F; b) adding crumb rubber and a mineral acid to the heated asphalt with stirring; and c) blowing air through the asphalt, crumb rubber and mineral acid mixture.
  • the present invention is directed to an improved process for producing GTR modified asphalt.
  • a mineral acid preferably polyphosphoric acid
  • the process is able to produce a more stable GTR modified asphalt at lower process temperatures and at a high production rate.
  • the air flow rates used in the process are typical of those used to produce air blown asphalt. Accordingly, any facility having a blowing still can produce GTR modified asphalt using the process described below.
  • the GTR modified asphalt is suitable for paving, coatings or industrial applications.
  • Any asphalt or asphalt blend can be used in the process.
  • the asphalt is heated to a temperature between about 325°F to about 550°F.
  • the GTR and the mineral acid are added to the heated asphalt and mixed with stirring.
  • the GTR may be as large as 10 mesh or may be 200 mesh or smaller.
  • GTR is added to achieve a level of from about 0.5% to about 25% by weight GTR of the weight of the GTR/asphalt/acid mixture.
  • any mineral acid may be used in the process.
  • the acid is any mineral acid.
  • the acid is any mineral acid.
  • the acid is any mineral acid.
  • the acid is any mineral acid.
  • polyphosphoric acid The acid is added to achieve an acid level of between about 0.05% to 5% of the weight of the GTR/asphalt/acid mixture. Air is blown through the mixture at a rate of about 0.5 cfm to 2.0 cfm, preferablyl .1 cfm.
  • the GTR, asphalt and mineral acid combination is preferably mixed for a period of between about 1 hour to 24 hours while air is blown through the mixture.
  • the following non limiting examples illustrate the practice and utility of the present invention:

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Civil Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Engineering & Computer Science (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Processes Of Treating Macromolecular Substances (AREA)
  • Road Paving Structures (AREA)

Abstract

The present invention relates to a method for producing a crumb rubber modified asphalt comprising the steps of: a) heating a pre-selected quantity of asphalt to a temperature of between about 325°F to 55O°F; b) adding crumb rubber and a mineral acid to the heated asphalt with stirring; and c) blowing air through the asphalt, crumb rubber and mineral acid mixture.

Description

Crumb Rubber Modified Asphalt With Improved Stability
Cross Reference to Related Applications
The present application claims priority from US Provisional Application/251 ,163 filed October 13, 2009, the entire contents of which is hereby incorporated reference.
Background of the Invention
A. Field of the Invention
Asphalt is used for a variety of purposes, including especially use in asphalt road paving systems and in roofing materials. The availability of asphalt materials has been reduced in recent years, while the cost of these materials has been increasing. For these and other reasons, there is great interest in finding ways to extend the useful life of asphalt containing products. In addition, asphalt road pavement and roofing materials may be exposed to a wide variety of weather conditions, including temperatures from below freezing to 100°F or more. At colder temperatures, asphalt can become brittle and crack, while at higher temperatures, asphalt can permanently deform, for example by rutting in road pavements. Therefore, modifications that extend or improve the properties of asphalt in cold or hot conditions are also desirable.
Crumb rubber has been used is asphalt for decades to modify the properties of the asphalt. Crumb rubber may be obtained from grinding waste rubber products, such as for example rubber shoe soles. One of the most common sources of crumb rubber is ground tire rubber (GTR). It will be understood that references to GTR in the following description of the invention includes any source of rubber crumb that is suitable for addition to asphalt. The mixing of GTR in asphalt or bitumen typically can lead to a heterogeneous blend with a liquid part and a solid material. The solid material settles when agitation of the GTR/asphalt mixture is stopped. The solid material is primarily carbon black, which has a significant negative impact on the workability of the GTR modified asphalt. The solid material mainly affects the viscosity and storage stability of the GTR modified asphalt. As a result of these drawbacks, the use of GTR in asphalt has been limited to some specific processes requiring special equipment. This can significantly increase the cost of pavement produced using the GTR modified asphalt.
B. Description of the Related Art
One prior process for producing GTR modified asphalt is described in
International Patent Publication No. WO 95/20623. In the processes described in WO 95/20623, the GTR/asphalt mixture is heated and bombarded with air at a temperature of 350° and 470°F. The air is supplied at about 2200 cfm and 10 psi. The hot air dehydrogenates the GTR and homogenizes the GTR/asphalt mixture.
It would be desirable to have a process for producing GTR modified asphalt that allows use of conventional air blowing equipment in a more efficient way.
Summary of the Invention
The present invention relates to a method for producing a crumb rubber modified asphalt comprising the steps of: a) heating a pre-selected quantity of asphalt to a temperature of between about 325°F to 550°F; b) adding crumb rubber and a mineral acid to the heated asphalt with stirring; and c) blowing air through the asphalt, crumb rubber and mineral acid mixture.
Detailed Description of Invention
The present invention is directed to an improved process for producing GTR modified asphalt. A mineral acid, preferably polyphosphoric acid, is added to a GTR/asphalt mixture under conditions similar to those used when making a roofing grade asphalt. The process is able to produce a more stable GTR modified asphalt at lower process temperatures and at a high production rate. In addition, the air flow rates used in the process are typical of those used to produce air blown asphalt. Accordingly, any facility having a blowing still can produce GTR modified asphalt using the process described below. The GTR modified asphalt is suitable for paving, coatings or industrial applications.
Any asphalt or asphalt blend can be used in the process. The asphalt is heated to a temperature between about 325°F to about 550°F. The GTR and the mineral acid are added to the heated asphalt and mixed with stirring. The GTR may be as large as 10 mesh or may be 200 mesh or smaller. GTR is added to achieve a level of from about 0.5% to about 25% by weight GTR of the weight of the GTR/asphalt/acid mixture.
Any mineral acid may be used in the process. Preferably, the acid is
polyphosphoric acid. The acid is added to achieve an acid level of between about 0.05% to 5% of the weight of the GTR/asphalt/acid mixture. Air is blown through the mixture at a rate of about 0.5 cfm to 2.0 cfm, preferablyl .1 cfm.
The GTR, asphalt and mineral acid combination is preferably mixed for a period of between about 1 hour to 24 hours while air is blown through the mixture. The following non limiting examples illustrate the practice and utility of the present invention:
Figure imgf000005_0001
Figure imgf000005_0002
The abbreviations used in the preceding examples are defined accordingly:
SP is softening point
Pen is penetration
PG is performance grading
ER is elastic recovery
The combination of PPA and crumb rubber compared to a crumb rubber modified asphalt leads to an increase in the softening point (SP) while improving the storage stability and Performance grade (PG) of the asphalt.

Claims

I claim
1. A method for producing a crumb rubber modified asphalt comprising the steps of: a) heating a pre-selected quantity of asphalt to a temperature of between about 325°F to 550°F; b) adding crumb rubber and a mineral acid to the heated asphalt with stirring; and c) blowing air through the asphalt, crumb rubber and mineral acid mixture.
2. The method of claim 1 , wherein the crumb rubber is ground tire rubber and is added to achieve a crumb rubber level of between about 0.5% to 25% by weight of the weight of the asphalt, crumb rubber and mineral acid mixture.
3. The method of claim 2, wherein the crumb rubber has a mesh size between about 10 mesh and about 200 mesh.
4. The method of claim 3, wherein the mineral acid is polyphosphoric acid and is added to achieve an acid level of between about 0.05% to about 5% by weight of the weight of the asphalt, crumb rubber and mineral acid mixture.
5. The method of claim 4, further comprising the step of blowing air through the asphalt, crumb rubber and mineral acid mixture while stirring.
6. The method of claim 5, wherein the asphalt, crumb rubber and mineral acid mixture is stirred for a period of between about 1 hour and about 24 hours.
PCT/US2010/052485 2009-10-13 2010-10-13 Crumb rubber modified asphalt with improved stability WO2011047032A2 (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
BR112012008819A BR112012008819A2 (en) 2009-10-13 2010-10-13 Modified fragmented rubber asphalt with improved stability
EP10824011.0A EP2488587B1 (en) 2009-10-13 2010-10-13 Crumb rubber modified asphalt with improved stability
DK10824011T DK2488587T3 (en) 2009-10-13 2010-10-13 Crumb rubber-modified asphalt having improved stability
ES10824011.0T ES2532431T3 (en) 2009-10-13 2010-10-13 Asphalt modified with granulated rubber with improved stability
PL10824011T PL2488587T3 (en) 2009-10-13 2010-10-13 Crumb rubber modified asphalt with improved stability
CA2780744A CA2780744C (en) 2009-10-13 2010-10-13 Crumb rubber modified asphalt with improved stability
MX2012004427A MX337658B (en) 2009-10-13 2010-10-13 Crumb rubber modified asphalt with improved stability.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US25116309P 2009-10-13 2009-10-13
US61/251,163 2009-10-13

Publications (2)

Publication Number Publication Date
WO2011047032A2 true WO2011047032A2 (en) 2011-04-21
WO2011047032A3 WO2011047032A3 (en) 2011-08-25

Family

ID=43876844

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2010/052485 WO2011047032A2 (en) 2009-10-13 2010-10-13 Crumb rubber modified asphalt with improved stability

Country Status (11)

Country Link
US (1) US8211960B2 (en)
EP (1) EP2488587B1 (en)
BR (1) BR112012008819A2 (en)
CA (1) CA2780744C (en)
CO (1) CO6531465A2 (en)
DK (1) DK2488587T3 (en)
ES (1) ES2532431T3 (en)
MX (1) MX337658B (en)
PL (1) PL2488587T3 (en)
PT (1) PT2488587E (en)
WO (1) WO2011047032A2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110272632A (en) * 2019-07-11 2019-09-24 长安大学 A kind of antifatigue modified pitch and preparation method thereof

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Publication number Priority date Publication date Assignee Title
US9617424B2 (en) * 2009-03-08 2017-04-11 Lehigh Technologies, Inc. Polyolefin asphalt modifiers, methods of modifying asphalt, asphalt compositions and methods of making
US9884965B2 (en) 2009-03-08 2018-02-06 Lehigh Tehnologies, Inc. Functional group asphalt modifiers, methods of modifying asphalt, asphalt compositions and methods of making
US8784554B2 (en) * 2009-03-08 2014-07-22 Premnathan Naidoo Asphalt modifiers, methods of modifying asphalt, asphalt compositions and methods of making
US20150105495A1 (en) * 2009-03-08 2015-04-16 Rheopave Technologies, Llc Polymeric asphalt modifiers, methods of modifying asphalt, asphalt compositions and methods of making
US9896582B2 (en) * 2009-03-08 2018-02-20 Lehigh Technologies, Inc. Micronized asphalt modifiers, methods of modifying asphalt, asphalt compositions and methods of making
CA2765965C (en) * 2009-06-19 2016-08-30 Innophos, Inc. Reclaimed asphalt pavement containing polyphosphoric acid modified binder

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US5583168A (en) * 1994-01-26 1996-12-10 Flanigan; Theodore P. One-stage abrasive absorption process for producing tire rubber modified asphalt cement systems and products thereof
FR2852018B1 (en) * 2003-03-07 2005-04-29 BITUMINOUS BINDER AND PROCESS FOR PREPARING IT.
MX2007013838A (en) * 2005-05-02 2008-01-28 Innophos Inc Modified asphalt binder material using crumb rubber and methods of manufacturing a modified asphalt binder.
DK1877492T3 (en) * 2005-05-03 2015-04-07 Innophos Inc MODIFIED ASPHALT BINDING MATERIAL USING THE CROSS-BONDED RUBBER MIGRANULATE AND PROCEDURE FOR MANUFACTURING A MODIFIED ASphalt Binder
US7901563B2 (en) * 2005-12-14 2011-03-08 Building Materials Investment Corporation Preparation of industrial asphalt
TW201002810A (en) * 2008-04-07 2010-01-16 Innophos Inc Process for producing an improved asphalt using polyphosphoric acid with air blowing

Non-Patent Citations (1)

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Title
See references of EP2488587A4 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110272632A (en) * 2019-07-11 2019-09-24 长安大学 A kind of antifatigue modified pitch and preparation method thereof

Also Published As

Publication number Publication date
EP2488587A2 (en) 2012-08-22
MX2012004427A (en) 2012-09-07
EP2488587B1 (en) 2014-12-10
CA2780744A1 (en) 2011-04-21
EP2488587A4 (en) 2013-07-31
US8211960B2 (en) 2012-07-03
WO2011047032A3 (en) 2011-08-25
PL2488587T3 (en) 2015-07-31
MX337658B (en) 2016-03-14
US20110160356A1 (en) 2011-06-30
CO6531465A2 (en) 2012-09-28
CA2780744C (en) 2017-05-02
PT2488587E (en) 2015-03-19
ES2532431T3 (en) 2015-03-26
DK2488587T3 (en) 2015-03-23
BR112012008819A2 (en) 2019-09-24

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