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Bituminous composition with thermoreversible properties

a technology of composition and bitumen, applied in the field of bitumens, can solve the problems of blown bitumen being more susceptible to ageing than the original bitumen, not always sufficiently efficient in the technique, and not always completely free of light fractions

Inactive Publication Date: 2010-08-05
TOTAL RAFFINAGE MARKETING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0034]The invention finally relates to a method for obtaining a bituminous composition which is hard at the temperatures of use without increasing its viscosity when hot, during which the organogelator can equally well be introduced at a temperature between 140 and 180° C. into the bitumen alone, or during manufacture, into the polymer bitumen, in the bitumen in the form of bituminous binder or into the bitumen when the latter is in the form of an anhydrous binder, in the form of a coated material or a surface dressing. The advantage of the present invention is obtaining bituminous compositions suitable for each envisaged use regardless of the hardness of the bitumen used. Thus the production of a hard bituminous composition depends neither on the nature of the crude oil used, nor on the quantity of light fractions contained in the bitumens used.

Problems solved by technology

This technique is not always sufficiently efficient and the heavy fractions are never completely free of light fractions.
Firstly, blown bitumens are more susceptible to ageing than the original bitumens.
One of the major drawbacks of blown bitumens is their viscosity at a given temperature which is greater than that of the original bitumen.
Another drawback linked to this high viscosity is the need to heat the blown bitumen to an application temperature greater than that of a non-blown bitumen of the same type, which increases energy expenditure and requires the use of additional protection for the operators.
However when hot the addition of polymers to the bituminous composition generally leads to an increase in the viscosity of the bituminous composition.

Method used

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  • Bituminous composition with thermoreversible properties
  • Bituminous composition with thermoreversible properties
  • Bituminous composition with thermoreversible properties

Examples

Experimental program
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Effect test

example 1

Preparation of a Bitumen / Organogelator Composition of Formula (I)

[0095]This first example relates to bitumen+organogelator compositions of general formula (I) according to the invention. Five types of organogelling molecules have been used in this example, at different concentrations. Their chemical structures are as follows:

C5H11—CONH—NHCO—C5H11  (1)

C9H19—CONH—NHCO—C9H19  (2)

C11H23—CONH—NHCO—C11H23  (3)

C17H35—CONH—CH2—CH2—NHCO—C17H35  (4)

C12H25—NHCONH—C6H4—CH2—C6H4—NHCONH—C12H25  (5)

[0096]The preparations are produced at 160-170° C., in a reactor with stirring. The control bitumen C1 is introduced into the reactor first. Then, the organogelator is added. The mixtures are stirred for approximately 60 minutes. Their final appearance is homogeneous. The mixtures are cooled down to ambient temperature. The control bitumen C1 is a direct distillation bitumen of grade 70-100 the characteristics of which correspond to the standard NF EN 12591.

TABLE 2Nature of theOrganogelatorCompositionso...

example 2

Preparation of a Bitumen / Organogelator Composition with Organogelling Molecules of a Different Nature (VII)

[0113]The compositions are prepared in the same way as in example 1. The organogelator concentration is 3%. The organogelator (for example C13 or C14) is constituted by a first type T1 of organogelling molecules (A1) and by a second type T2 of organogelling molecules (B1 or B2). The molar ratio of the two types T1 and T2 is 1 to 1.

[0114]Aminopyrimidine+barbituric acid

[0115]The composition C13 comprises an aminopyrimidine derivative A1, 5-octyl-2,4,6-triaminopyrimidine and a barbituric acid derivative B1, 5,5-dioctylbarbituric acid. The C14 composition comprises an aminopyrimidine derivative A1, 5-octyl-2,4,6-triaminopyrimidine and barbituric acid B2.

TABLE 4Ringand ballsofteningCom-PenetrabilitypointPfeifferViscosityViscositypositionsP25(RBSP)index PIat 140° C.at 160° C.C17647.5−0.8267165C135952.0−0.31276168C146152.5−0.11311186

[0116]Phenol+sulphosuccinate

[0117]The C15 compositio...

example 3

Preparation of a Bitumen / Organogelator Composition with a Sorbitol Derivative (III) 1,3:2,4-Di-O-benzylidene-D-sorbitol (DBS) As Organogelator

[0118]The compositions are prepared in the same way as in example 1. The organogelator is used at different concentrations.

TABLE 6OrganogelatorCompositionsconcentrationC1 (control)0%C193%C201%C210.66%  C220.33%  C230.1%  

[0119]The results obtained are recorded in Table 7 below:

TABLE 7Ringand ballsofteningCom-PenetrabilitypointPfeifferViscosityViscositypositionsP25(RBSP)index PIat 140° C.at 160° C.C1 (control)7646.6−1.0267165C193616110310125C2039143.59.31314118C2146131.58.95298115C2255946.28257113C237447.8−0.82253111

[0120]It is noted that the addition of DBS makes it possible to significantly increase the ring and ball temperature of the compositions even at low DBS concentrations (see for example C22). The penetrability also reduces with the addition of DBS. The viscosities at 140° C. and 160° C. of the compositions with additives are equivale...

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Abstract

The invention relates to a bituminous composition that comprises a major portion of at least one bitumen and a minor portion of at least one chemical additive, said additive being an organogelling agent that generates a network of hydrogen bonds between the organogelling molecules constituting the same, and trapping the bitumen phase up to a maximum temperature TR of between 40 and 120° C. The invention also relates to the use of these bitumen compositions in the field of road applications, particularly in the production of road binders, as well as in industrial applications. The invention also relates to a method for preparing these bituminous compositions.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is a National Phase Entry of International Application No. PCT / FR2008 / 000066, filed on Jan. 18, 2008, which claims priority to French Patent Application No. 07 05225, filed on Jul. 19, 2007 and French Patent Application No. 07 00441, filed on Jan. 23, 2007, all of which are incorporated by reference herein.TECHNICAL FIELD[0002]The present invention belongs to the field of the bitumens. More specifically, it relates to bituminous compositions comprising an organogelator type additive, the bituminous compositions having thermoreversible viscosity and hardness characteristics. The invention also relates to the use of these bituminous compositions in the fields of highway applications, in particular in the manufacture of road binders, and in the fields of industrial applications. The invention also relates to the method for preparing these bituminous compositions.TECHNICAL CONTEXT[0003]The use of bitumen in the manufacture of...

Claims

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Application Information

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IPC IPC(8): C08L95/00
CPCC08K5/0008C08L95/00C09D195/00C08L2666/66C08K5/092
Inventor LAPALU, LAURENCEVINCENT, REGISBOUTEILLE, LAURENTISARE, BENJAMIN
Owner TOTAL RAFFINAGE MARKETING
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