Classifications

• • 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
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
  • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
  • C08L23/04—Homopolymers or copolymers of ethene
  • C08L23/08—Copolymers of ethene
  • C08L23/0846—Copolymers of ethene with unsaturated hydrocarbons containing atoms other than carbon or hydrogen
  • C08L23/0869—Copolymers of ethene with unsaturated hydrocarbons containing atoms other than carbon or hydrogen with unsaturated acids, e.g. [meth]acrylic acid; with unsaturated esters, e.g. [meth]acrylic acid esters
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
  • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
  • C08L23/04—Homopolymers or copolymers of ethene
  • C08L23/08—Copolymers of ethene
  • C08L23/0846—Copolymers of ethene with unsaturated hydrocarbons containing atoms other than carbon or hydrogen
  • C08L23/0869—Copolymers of ethene with unsaturated hydrocarbons containing atoms other than carbon or hydrogen with unsaturated acids, e.g. [meth]acrylic acid; with unsaturated esters, e.g. [meth]acrylic acid esters
  • C08L23/0884—Epoxide-containing esters
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L2205/00—Polymer mixtures characterised by other features
  • C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L2205/00—Polymer mixtures characterised by other features
  • C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L2555/00—Characteristics of bituminous mixtures
  • C08L2555/40—Mixtures based upon bitumen or asphalt containing functional additives
  • C08L2555/80—Macromolecular constituents
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L2555/00—Characteristics of bituminous mixtures
  • C08L2555/40—Mixtures based upon bitumen or asphalt containing functional additives
  • C08L2555/80—Macromolecular constituents
  • C08L2555/86—Polymers containing aliphatic hydrocarbons only, e.g. polyethylene, polypropylene or ethylene-propylene-diene copolymers

Definitions

• the invention belongs to the field of bituminous mixes and more specifically to the technologies relating to functional additives added to the mixture of bitumen and aggregates in order to confer on it particular physico-chemical and mechanical properties. More specifically, the invention relates to a premix composition directly usable to be dispersed in the mixture of bitumen and aggregates to give it the desired properties.
• the invention also relates to a bituminous mix comprising a specific proportion (concentration range in the bitumen mixture and aggregates, relative weight) of the aforesaid premix and the use of this premix for obtaining an asphalt mix.
• bitumen is the main hydrocarbon binder used in the field of road construction or civil engineering.
• Bitumen or asphalt is the heaviest portion in the process of oil distillation. Due to the different origins and processes of distillation of such oils, the resulting bitumen can have a wide range of properties and characteristics.
• bitumen refers not only to the direct distillation petroleum product or to the distillation of petroleum at reduced pressures, but also to products derived from the extraction of tar and tar sands, oxidation products and and / or fluxing with carbon solvents comprising paraffins and waxes of such bituminous materials, as well as blown or semi-blown bitumens, synthetic bitumens (such as those described for example in FR-A-2853647), tars, petroleum resins or indene-coumarone resins mixed with aromatic and / or paraffinic hydrocarbons and mixtures thereof, mixtures of such bituminous materials with acids, and the like.
• bitumen in bituminous mixes, in which the bitumen is mixed with aggregates which may be different sizes, shapes and chemical natures. These bituminous mixes are used in particular for the construction, repair and maintenance of sidewalks, roads, highways, parking lots or airport runways and service roads and any other running surface.
• the aggregates include, but are not limited to, mineral aggregates which are the product of quarries as well as aggregates recovered from previous mixes ("Reclaimed Asphalt Pavement", RAP), as described for example in the standard AFNOR XP P98-135, December 2001, Asphalt Handbook, MS-4 7 th edition, published by the Asphalt Institute, USA), produced from the demolition of buildings and their mixtures as well as organic fibers and inorganic materials, such as glass, metal or carbon fibers, as well as cellulose, cotton, polypropylene, polyester, polyvinyl alcohol and polyamide fibers.
• mineral aggregates which are the product of quarries as well as aggregates recovered from previous mixes ("Reclaimed Asphalt Pavement", RAP), as described for example in the standard AFNOR XP P98-135, December 2001, Asphalt Handbook, MS-4 7 th edition, published by the Asphalt Institute, USA), produced from the demolition of buildings and their mixtures as well as organic fibers and inorganic materials, such as glass, metal or carbon fibers, as well as cellulose, cotton, polypropylene, polyester,
• bitumen is the main hydrocarbon binder (to bind the aggregates between them) used in the field of road construction or civil engineering.
• bitumen To be used as a binder in these different applications, the bitumen must have certain physicochemical properties.
• One of the most important properties is the hardness of the bitumen; this must be at sufficiently high temperatures to avoid rutting caused by traffic.
• Another very important characteristic is the viscosity of the bitumen; the bitumen must be sufficiently fluid at the lowest possible application temperatures.
• bitumens are manufactured in a blowing unit, passing a flow of air and / or oxygen through a starting bitumen.
• This thermal oxidation operation may be conducted in the presence of an oxidation catalyst, for example phosphoric acid.
• the blowing is carried out at high temperatures, of the order of 200 to 300 ° C, for relatively long periods of time typically between 30 minutes and 2 hours, continuously or batch. This blowing process has a number of disadvantages which make this technique very often unacceptable.
• Another way to harden a bitumen, or to modify its mechanical properties is to add polymers to it.
• These polymers make it possible in particular to improve the cohesion of the binder, to improve the elastic properties of the binder, to increase the plasticity range of the bitumen, to increase the resistance to deformation and also to increase the bitumen hardness by decreasing its penetrability and thermal susceptibility, as well as improving its rheological properties. At operating temperatures, these characteristics are therefore significantly improved, which will reduce or even eliminate the risk of cracking and rutting, which results in very low maintenance and maintenance costs.
• this polymer modification it is possible to implement much finer road ribbons with unmodified bitumen, while having superior mechanical performance.
• the current technology for introducing these polymeric additives follows the following steps. Firstly, in a first step, the polymeric additives are added to all the necessary bitumen, or almost, to make the bituminous mix (final), which constitutes a mixture identified as "modified bitumen” or "Binder”, then in a second step, the aggregates, with possibly additional bitumen, are added to this modified bitumen to form the bituminous mix.
• bituminous a completely different technique in its process of preparation of bituminous mix. It aims at overcoming the disadvantages of the aforementioned preparation technique by allowing a one-step preparation of the bituminous mix, which is moreover in situ, that is to say on the site of coating of the aggregates by the binder.
• This technique for preparing the bituminous mix consists in producing a premix combining bitumen with a quantity of one or more polymers. This pre-mix is supplied to the operators who, according to the particularities of their needs in the field, realize the bituminous mix by adding this premix to bitumen and aggregates.
• this premix since the levels of polymers present in this premix are greater than 35%, the use of this premix is economically viable for the preparation of bituminous mixes in a single step.
• the present invention thus relates to a premix composition for bituminous mix, comprising: from 35% to 65%, by weight of the composition, of bitumen,
• a first copolymer (A) of an alpha olefin and an unsaturated carboxylic acid ester characterized in that it further comprises % to 65% by weight of a second copolymer (B) of an alpha olefin, an unsaturated epoxide and an unsaturated carboxylic acid ester and in that the aforesaid first copolymer (A) and the aforesaid second copolymer (B) represent between 35% and 65% by weight of said composition.
• the premix composition will consist solely of the three elements referred to above, namely the bitumen and the first and second copolymers.
• the mass ratio of (B) / [(A) + (B)] is between 0.15 and
• composition according to the invention consists of the bitumen and the first and second aforementioned copolymers
• the alpha olefin of the abovementioned first and second copolymers (A) and (B) consists of an ethylene, propylene, 1-butene, isobutene, 1-pentene and 1-hexene group, 1 decene, 4-methyl-1-butene, 4,4-dimethyl-1-pentene, vinylcyclohexane, styrene, methylstyrene, styrene substituted with alkyls, and preferably with ethylene;
• the unsaturated carboxylic acid ester of the above-mentioned first and second copolymers (A) and (B) consists of a
• alkyl (meth) acrylate the alkyl group having up to 24 carbon atoms
• the unsaturated epoxide of the copolymer (B) consists of an aliphatic glycidyl ester / ether or an alicyclic glycidyl ester / ether;
• the second copolymer (B) is an ethylene / alkyl (meth) acrylate / glycidyl (meth) acrylate copolymer, having from 0.1% to 65% by weight of alkyl (meth) acrylate of which alkyl has from 1 to 10 carbons and up to 12% by weight of glycidyl (meth) acrylate;
• the first copolymer (A) is an ethylene / alkyl (meth) acrylate copolymer whose alkyl contains from 1 to 10 carbons and up to 65% by weight of meth) acrylate.
• the invention notably has the advantages of being able to be implemented in situ, without any deterioration of the bituminous mix and for an economic gain (application time, labor, quantity of bituminous mix corresponding to the real need) .
• the present invention also relates to a bituminous mix comprising aggregates and bitumen characterized in that it comprises a premix composition as defined above.
• a premix composition as defined above.
• said premix composition is present between 1% and 15% by weight, preferably between 3% and 8%, in the bituminous mix.
• the invention relates to the use of the abovementioned composition for the preparation of a bituminous mix.
• bitumen this element may consist of any element falling within the definition or under the name of bitumen such that the person skilled in the art can apprehend it without undue effort.
• the second copolymer (B) is a copolymer of an alpha olefin comprising at least one unsaturated epoxide and at least one unsaturated carboxylic acid ester.
• the unsaturated epoxide can be chosen from: aliphatic glycidyl esters and ethers such as rallyl glycidyl ether, vinyl glycidyl ether, glycidyl maleate and itaconate, glycidyl acrylate and methacrylate, and
• alicyclic glycidyl esters and ethers such as 2-cyclohexene-1-glycidyl ether, cyclohexene-4,5-diglycidylcarboxylate, cyclohexene-4-glycidyl carboxylate, 5-norbornene-2-methyl-2-glycidyl carboxylate and endocis-bicyclo (2,2,1) -5-heptene-2,3-diglycidyl dicarboxylate.
• glycidyl (meth) acrylate is used.
• the unsaturated carboxylic acid ester may be, for example, an alkyl (meth) acrylate, the alkyl group possibly having up to 24 carbon atoms.
• alkyl acrylate (or methacrylate) which may be used are, in particular, methyl acrylate, ethyl acrylate, n-butyl acrylate, isobutyl acrylate, acrylate and the like. ethylhexyl.
• the alpha olefin may be ethylene, propylene, 1-butene, isobutene, 1-pentene, 1-hexene, 1-decene, 4-methyl-1-butene, 4,4 dimethyl-1-pentene, vinylcyclohexane, styrene, methylstyrene, styrene substituted with alkyls.
• ethylene is used.
• the unsaturated epoxide can be grafted or copolymerized with the alpha olefin and the unsaturated carboxylic acid ester.
• the copolymerization is preferred.
• (B) is an ethylene / alkyl (meth) acrylate copolymer whose alkyl has from 1 to 10 carbons / glycidyl (meth) acrylate and containing up to 65% by weight of (meth) acrylate and up to 12% by weight of epoxide.
• the first copolymer (A) is a copolymer of an alpha olefin comprising at least one unsaturated carboxylic acid ester.
• the alpha olefin and the unsaturated carboxylic acid ester may be chosen from the same products already mentioned above for the copolymer (B).
• (A) is an ethylene / alkyl (meth) acrylate copolymer whose alkyl has from 1 to 10 carbon atoms and containing up to 65% by weight of (meth) acrylate.
• the premix according to the invention is produced according to a one-step process in which the ingredients are mixed to give a homogeneous composition and perform any chemical reactions between components.
• This premix can be prepared by mixing the various constituents by the conventional means of implementation of thermoplastics such as extrusion or kneading. It is possible to use an internal mixer, a co-kneader or a co-rotating twin-screw extruder.
• the compositions are produced at a temperature of between 100 and 300 ° C.
• the premix according to the invention is used during the step of coating the aggregates, its characterization is carried out by dilution in an unmodified bitumen in order to form a binder of composition equivalent to that obtained during the step of coating the aggregates.
• the elastic return and viscosity properties are conventionally measured on the binder and not on the bituminous mix.
• the premixes were prepared using a Plastograph Brabender ® internal mixer at a temperature of 160 ° C and a rotational speed of the rotors of 60 rpm ("round per minute" or rpm).
• the polymers are first introduced to be melted and intimately mixed.
• the bitumen is then introduced into the internal mixer after being preheated to 150 ° C. Adding the bitumen should be slow enough (a few minutes) to allow good incorporation into the polymer blend.
• the mixing time after introduction of all components is ten (10) minutes.
• the binders were prepared in a reactor maintained at 160 ° C. and equipped with a mechanical stirring system by mixing 25 g of premix and 475 g of non-additive bitumen.
• the amount of premix used represents 5% of the binder thus obtained.
• the stirring speed is 400 rpm and the mixing time is 2 hours.
• the binder then undergoes a heat treatment of 24 hours (a full day) at 190 ° C. before evaluation of these elastic return and viscosity properties.
• the viscosity measurements are carried out using a viscometer of the "Brookfield viscometer” type.
• the measuring device used is a Brookfield ® DVIII viscometer.
• the principle of measurement is based on measuring the torque (proportional to the shear stress) necessary to keep constant the rotational angular velocity (proportional to the shear rate) of a mobile immersed in the modified bitumen, and deduce proportionally the viscosity of the latter.
• the measurement is performed using a SC4-21 mobile (ISO 2555 standard). Between 5 to
• the elastic return of a modified bitumen is an indicator that makes it possible to characterize the capacity of the binder to recover its original geometric characteristics following a deformation. It is determined by means of a laboratory test using apparatus similar to that of the ductility test and that of force-ductility, a device commonly referred to as a "ductilimeter". The measuring device used is a Fröwag ® type 1.723 ductilimeter.
• the measurement is carried out as described below according to Standard NF EN 13398. After thermal equilibrium of the test pieces placed in the apparatus (30 minutes in a water bath thermostatically controlled at 25 ° C.), these are drawn at 50 mm. / min (millimeter per minute) to undergo an elongation of 200 mm. Within 10 seconds after the end of the stretching, the specimens are then cut in their medium and the shrinkage length of the specimen is measured after 30 minutes. The value of the springback is the percentage of shrinkage length of the specimen reduced to its total length. An elastic return rate of 100% corresponds to a binder that completely covers its original dimensions (before stretching).
• the bitumen used is a bitumen having a penetrability, determined according to the methods of the NF EN1426 standard, in the range of 50/70.
• Lotader ® AX8900 terpolymer of ethylene, methyl acrylate (24% by weight) and glycidyl methacrylate (8% by weight) produced by ARKEMA having an MFI (190 ° C, 2.16 kg measured according to ISO 1133) of 6 g / 10 min.
• Lotryl 17BA07 ® copolymer of ethylene and butyl acrylate (17 wt%) produced by Arkema having an MFI (190 ° C, 2.16 kg measured according to ISO 1133) of 7 g / 10 min.
• the bituminous binder must have certain advantageous characteristics.
• the viscosity at 135 ° C of the bituminous binder which should ideally be less than 3000 mPa.s;

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• 2013
  • 2013-04-25 FR FR1353782A patent/FR3005058B1/fr active Active
• 2014
  • 2014-04-18 EP EP14722292.1A patent/EP2989162A1/de not_active Withdrawn
  • 2014-04-18 US US14/786,935 patent/US20160102207A1/en not_active Abandoned
  • 2014-04-18 BR BR112015026984A patent/BR112015026984A2/pt not_active IP Right Cessation
  • 2014-04-18 WO PCT/FR2014/050949 patent/WO2014174190A1/fr not_active Ceased
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