CN104710134A - Storage-stable and ageing-resistant composite SBS particle modified asphalt concrete and preparation method thereof - Google Patents
Storage-stable and ageing-resistant composite SBS particle modified asphalt concrete and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a storage-stable and ageing-resistant composite SBS particle modified asphalt concrete and a preparation method thereof. The composite SBS particles comprise 15%-38% of SBS, 56%-82% of deep activation rubber powder, and 3%-6% of an interface compatibilizer, wherein the deep activation rubber powder consists of rubber powder, softening oil and an activating agent. According to the storage-stable and ageing-resistant composite SBS particle modified asphalt concrete and the preparation method thereof, waste rubber power is processed through a double-screw extruder under the high-temperature and high shearing condition to obtain the deep activation rubber powder; and besides, the blending effect of screw rods is utilized to fully mix SBS particles with the deep activation rubber powder to prepare the composite SBS particles through granulation, and the composite SBS particles are utilized to prepare modified asphalt concrete; Compared with a common SBS modifying agent, the composite SBS particle modified asphalt concrete is better in ageing resistance, and has no heat storage evolution; junked tires can be excessively consumed, the black pollution is reduced, city noise pollution is reduced, and the surface drainage is facilitated, water splattering is alleviated, and the traffic safety performance is improved through the pavement surface microscopic structure.
Description
Technical field
The present invention relates to a kind of material of construction for engineering field, particularly relate to a kind of storage-stable, the particle modified bituminous concrete of ageing-resistant composite S BS and preparation method thereof.
Background technology
At present, add polymkeric substance improve the performance of matrix pitch and then obtain modified asphalt concrete for extensively to approve in the industry.Styrene butadiene block copolymer (SBS) is a kind of polymer modified asphalt properties-correcting agent of maturation, and its consumption accounts for the over half of properties-correcting agent total amount.Thermoplastic elastomer SBS is owing to having the feature of rubber and plastics two-phase concurrently, and modifying asphalt prepared therefrom has good high temperature performance, possesses good modification restorability simultaneously, is a kind of excellent properties-correcting agent.But its fancy price, higher modified asphalt material cost limit the widespread use of SBS.Therefore, people are finding a kind of more economical, more excellent asphalt modifier of performance, in order to alternative SBS.Have at present about mixing a small amount of rubber powder in SBS modifying asphalt with the report of composite modified asphalt.The ripe rubber powder mode of production is ambient ground grinding method.
China has a large amount of waste olds to produce every year, utilize rubber powder Some substitute SBS composite modified asphalt, effectively can save rubber sources, also the recycling of waste old can be impelled, do not cause " secondary pollution ", its cheap price also can reduce modifying asphalt material cost to a certain extent simultaneously.Patent CN102601975A reports a kind of method utilizing twin screw extruder to extrude liquid regeneration glue continuously, and introduce liquid reclaimed rubber substitutes example and the performance of matrix pitch, the DeGrain though performance makes moderate progress.Patent CN102977621A reports a kind of method of rubber powder and SBS composite modified asphalt.Its SBS incorporation is 0.5-6%, and rubber powder incorporation is 0.5-12%, and mineral powder loading level is 0.5-8%.This method can improve the ageing resistance of modifying asphalt to a certain extent, and high-temperature behavior also has certain improvement simultaneously.But mixing of the rubber powder of crosslinking condition, causes SBS modifying asphalt network stabilization to decline, reduces the low-temperature performance of modifying asphalt.Meanwhile, the rubber powder of crosslinking condition mixes the swelling viscosity of modifying asphalt that makes of absorption light constituent and obviously rises, and adds the difficulty of construction.The rubber powder incorporation of this method is lower, and SBS volume is relatively high, limited to the reduction contribution rate of modifying asphalt cost.
Patent CN101812234A reports the method for a kind of waste rubber powder/waste plastics material/SBS composite modified asphalt.Volume 5-15% in its shoddy, plastic waste 1-5%, SBS1-3%.The method first drops into matrix pitch plastic waste, stirring and dissolving at 120-150 DEG C, is warming up to 180-200 DEG C subsequently, drops into shoddy and SBS, stirs and prepare modifying asphalt in 0.5-3 hour.The plastic waste incorporation of this method is higher, although the high-temperature behavior of modifying asphalt can be better to improve, but the feature due to the low temperature brittleness of plastics can cause the remarkable loss of the low-temperature performance of modifying asphalt, simultaneously, this even, the refinement only adopting the mode of dispersed with stirring to be difficult to ensure SBS, the modifying asphalt network structure formed is unstable, can not get good modifying asphalt effect.Meanwhile, owing to adding more crisp plastics, low-temperature performance and the anti-fatigue performance of its ground surface material have greater loss.
Patent CN103146206A reports a kind of preparation method of composite modified asphalt of stable storing.First SBS and rubber powder powder are dropped into twin screw extruder by the method in proportion, rubber powder/SBS particle is prepared through high temperature (more than 190 DEG C) blending extrusion, the SBS adding 0-5% subsequently in the matrix pitch of 130-170 DEG C shears and disperses and add the SBS/ rubber powder particle of 1-20% and the furfural extract oil of about 5%, stirs to grow and prepares composite modified asphalt in 3-5 hour.The method prepares particle SBS and rubber powder through blended under the condition of high temperature, high-shear, and this high temperature, high-shear can cause SBS to degrade, and then weaken its modified effect; Meanwhile, under not having external assistant activator auxiliary, only by hot shearing, rubber powder can not reach overactive state, retain the crosslinking structure of considerable part, a large amount of admixtures of the rubber powder particle of this crosslinking structure can promote modifying asphalt system viscosity, increase difficulty of construction.And this method is mixed with the higher furfural extract oil of price, this there is no benefit to the reduction of modifying asphalt cost.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, a kind of novel stable storing, the particle modified bituminous concrete of ageing-resistant composite S BS and preparation method thereof are proposed, a difficult problem for waste rubber cycling and reutilization can be solved, the SBS addition content in modified asphalt concrete can be reduced again, and significantly improve hot storage stability and the ageing-resistant performance of the particle modified bituminous concrete of SBS.
Technical scheme of the present invention:
A kind of stable storing, the particle modified bituminous concrete of ageing-resistant composite S BS, it is characterized in that by gather materials and the particle modified pitch of composite S BS mixes, by mass ratio, wherein said modifying asphalt is that the pitch of 100:2-30:0.1-3, composite S BS particle and stablizer mix obtained; Described composite S BS particle comprises SBS, deep activation rubber powder, interfacial compatibilizer, its mass percent is 15-38:56-82:3-6, wherein said deep activation rubber powder by mass ratio be the waste Crumb rubber of 100:3-20:0.3-4, softening oil and activator extrude obtained by stirring.
Described waste Crumb rubber is preferably obtained by one or more in damaged tire, useless hand cart tyre, useless conveying belt, scrap rubber footwear, and particle size range is 0.1-10mm; Describedly gathering materials and the bitumen aggregate ratio of the particle modified pitch of composite S BS is preferably 5.0-5.2, is AC-13 grating.
Described softening oil is preferably the mixture of one or more in Stockholm tar, naphthenic oil, Yatall MA, aromatic hydrocarbon oil, rosin.
Described activator is preferably one or several the mixture in phenyl disulfide, thiophenol, polyalkylbenzene phenol disulphide, octadecylamine.
The preferred sol content of described deep activation rubber powder is greater than 80%, and mooney viscosity is less than 1, and Sol molecular weight is greater than 10,000.
Described SBS is preferably the linear structure that hub-and-spoke configuration that molecular weight is 15-50 ten thousand and/or molecular weight are 5-25 ten thousand.
Described interfacial compatibilizer is preferably the mixture of one or more in Research of Grafting Malaic Anhydride Onto Polyethylene, ethylene-vinyl acetate copolymer, polyethylene, polypropylene, polyoxyethylene.
The preparation method of above-mentioned a kind of stable storing, the particle modified bituminous concrete of ageing-resistant composite S BS, is characterized in that comprising the following steps:
To join in the first screw extrusion press after described rubber powder, softening oil, activator mix, stirring, control temperature be 100-380 DEG C, extrudes continuously, obtain deep activation rubber powder after shearing, reacting;
Join in the second screw extrusion press by described deep activation rubber powder and SBS and interfacial compatibilizer, control temperature, at 80-200 DEG C, is extruded after mixing, granulation is obtained composite S BS particle;
By asphalt heating to 160-180 DEG C, stir and add composite S BS particle heat-insulating premix 5-100 minute, shear 1-100 minute with velocity of shear 1000-10000 rev/min subsequently, in process, add stablizer;
Grow 60-300 minute with 100-500 rev/min of rapid stirring insulation, prepare modifying asphalt;
Modifying asphalt is joined obtained modified asphalt concrete in gathering materials.
Preferably described first screw extrusion press is twin screw extruder, and material pressure is 2-20MPa, and screw speed is 10rpm-300rpm, and the reaction times is 5-20min; Described second screw extrusion press is single screw extrusion machine, and screw speed is 10-200rpm, barrel pressure 2-20MPa; .
Preferred described mixing, stirring are with 50-100 DEG C of pre-treatment 10-30 minute in homogenizer.
Advantageous Effects of the present invention:
(1) utilize twin screw to prepare deep activation rubber powder, with low cost, effectively can control the waste water, waste gas etc. " secondary pollution " that produce in traditional waste rubber regenerative process, the waste rubber environment-friendly type regeneration belonged to truly utilizes;
(2) the deep activation rubber powder of high desulfurization degree, linear molecule content high (higher than 80%), molecular weight is large, molecular structure and SBS similar, with SBS through mixing, miscible granulation, can Some substitute SBS, mix through shearing homogenizing with pitch, form the stabilizing network structure of pitch-SBS-deep activation rubber powder type, still obtain the particle modified pitch of the good composite S BS of effect when SBS consumption is lower;
(3) the deep activation rubber powder of high desulfurization degree, the active site of backbone molecule disappears substantially, ageing-resistant performance is more excellent, with SBS through mixing, miscible granulation, effectively can delay the aging attenuation problem of SBS modifying asphalt, obtain the particle modified pitch of composite S BS of high-temperature storage excellent in stability.
(4) the mixing of deep activation rubber powder of high desulfurization degree, add modifying asphalt with gather materials wrap up in attached ability, the interface binding power enhancing pitch Yu gather materials, then improve the water stabilizing of asphalt; Meanwhile, mixing of a large amount of elastomeric material, improves low temperature flexibility and the elasticity of bituminous material, then improves the fatigue performance of asphalt.
Accompanying drawing explanation
Fig. 1 is the preparation flow figure of a kind of storage-stable of the present invention, the particle modified bituminous concrete of ageing-resistant composite S BS.
Embodiment
In order to be expressly understood content of the present invention, will be illustrated in greater detail by specific embodiments and the drawings.
Below by the comparative example 3 by only using the comparative example 1,2 of SBS modification and SBS and common waste Crumb rubber mixed and modified, contrast with the embodiment 1-6 carrying out modification according to schema shown in Fig. 1, the performance difference of the bituminous concrete using composite S BS particle of the present invention and prior art modification to obtain is shown.
In following comparative example and embodiment, waste Crumb rubber is the full tire meridian glue rubber powder of 1mm; Softening oil is Stockholm tar; Activator is rubber activator 420; Interfacial compatibilizer is Research of Grafting Malaic Anhydride Onto Polyethylene; Stablizer adopts the one package stabilizer of SULPHUR POWDER, zinc oxide, stearic acid, TMTD, and its mass ratio is: SULPHUR POWDER 80wt%, zinc oxide 5wt%, stearic acid 10wt%, TMTD5wt%; Matrix pitch is one or more in petroleum pitch, rock asphalt, coal-tar pitch; Gather materials and refer to that being applied to the particle diameter of bituminous concrete also namely in asphalt is greater than the rubble of more than 2.36mm, crushing gravel, graded gravel and slag etc.
Comparative example 1:
Take 4.5%SBS (linearly) by matrix pitch weight ratio to join in matrix pitch and to shear 5min, stirring subsequently adds the stablizer of 0.4% and breed 4 hours at 170-175 DEG C, obtained conventional SBS modified asphalt, numbering 1#, and test its performance.
Comparative example 2:
Take 4.0%SBS (linearly) by matrix pitch weight ratio to join in matrix pitch and to shear 5min, stirring subsequently adds the stablizer of 0.4% and breed 4 hours at 170-175 DEG C, obtained conventional SBS modified modifying asphalt, numbering 2#, and test its performance.
Comparative example 3:
Take 4.0%SBS (linearly) by matrix pitch weight ratio, 5% waste Crumb rubber (40 order) to join in matrix pitch and to shear 5min, stirring subsequently adds the stablizer of 0.4% and breed 4 hours at 170-175 DEG C, obtained conventional SBS modified asphalt, numbering 3#, and test its performance.
Embodiment 1:
By rubber powder, softening oil, activator according to weight ratio 100:5:2 in homogenizer at 70 DEG C of pre-treatment 15min, be metered into the first screw extrusion press, control the different zone temperatures of twin screw at 100-380 DEG C.Wherein, first paragraph: 150-200 DEG C, second segment: 250-300 DEG C; 3rd section: 300-350 DEG C; 4th section: 300-350 DEG C; 5th section: 150-200 DEG C, make material pressure at about 10Mpa by adjusting suitable, left-hand thread element mixing pressurization, the rotating speed controlling screw rod at about 100rpm, through shearing, after reaction about 10min from die extrusion deep activation rubber powder.Subsequently, deep activation rubber powder is metered into the second screw extrusion press by junctor, adjust hopper feed speed is that 15:82:3 adds SBS and interfacial compatibilizer according to SBS, deep activation rubber powder, interfacial compatibilizer weight ratio simultaneously, control singe screw barrel zone temperature at about 120 DEG C, screw speed 100rpm, about barrel pressure 10Mpa, Homogeneous phase mixing, extrudes, through water-cooled preparation stable storing, ageing-resistant composite S BS particle.10% stable storing, ageing-resistant composite S BS particle is taken by matrix pitch weight ratio, to join in matrix pitch and to shear 5min, stirring subsequently adds the stablizer of 0.4% and breed 4 hours at 170-175 DEG C, the obtained particle modified pitch of composite S BS, numbering 4#.
Embodiment 2:
By rubber powder, softening oil, activator according to weight ratio 100:10:1 in homogenizer at 70 DEG C of pre-treatment 15min, be metered into the first screw extrusion press, through shear, reaction after from die extrusion deep activation rubber powder.Subsequently, deep activation rubber powder is metered into the second screw extrusion press by junctor, adjust hopper feed speed simultaneously and add SBS and interfacial compatibilizer according to SBS, deep activation rubber powder, interfacial compatibilizer weight ratio 20:75:5, Homogeneous phase mixing, to extrude, through water-cooled preparation stable storing, ageing-resistant composite S BS particle.Each process parameter is substantially with embodiment 1.10% stable storing, ageing-resistant composite S BS particle is taken by matrix pitch weight ratio, to join in matrix pitch and to shear 5min, stirring subsequently adds the stablizer of 0.4% and breed 4 hours at 170-175 DEG C, the obtained particle modified pitch of composite S BS, numbering 5#.
Embodiment 3:
By rubber powder, softening oil, activator according to weight ratio 100:15:3 in homogenizer at 70 DEG C of pre-treatment 15min, be metered into the first screw extrusion press, through shear, reaction after from die extrusion deep activation rubber powder.Subsequently, deep activation rubber powder is metered into the second screw extrusion press by junctor, adjust hopper feed speed simultaneously and add SBS and interfacial compatibilizer according to SBS, deep activation rubber powder, interfacial compatibilizer weight ratio 28:68:4, Homogeneous phase mixing, to extrude, through water-cooled preparation stable storing, ageing-resistant composite S BS particle.Each process parameter is substantially with embodiment 1.12% stable storing, ageing-resistant composite S BS particle is taken by matrix pitch weight ratio, to join in matrix pitch and to shear 5min, stirring subsequently adds the stablizer of 0.4% and breed 4 hours at 170-175 DEG C, the obtained particle modified pitch of composite S BS, numbering 6#.
Embodiment 4:
By rubber powder, softening oil, activator according to weight ratio 100:18:0.5 in homogenizer at 70 DEG C of pre-treatment 15min, be metered into the first screw extrusion press, through shear, reaction after from die extrusion deep activation rubber powder.Subsequently, deep activation rubber powder is metered into the second screw extrusion press by junctor, adjust hopper feed speed simultaneously and add SBS and interfacial compatibilizer according to SBS, deep activation rubber powder, interfacial compatibilizer weight ratio 32:63:5, Homogeneous phase mixing, to extrude, through water-cooled preparation stable storing, ageing-resistant composite S BS particle.Each process parameter is substantially with embodiment 1.15% stable storing, ageing-resistant composite S BS particle is taken by matrix pitch weight ratio, to join in matrix pitch and to shear 5min, stirring subsequently adds the stablizer of 0.4% and breed 4 hours at 170-175 DEG C, the obtained particle modified pitch of composite S BS, numbering 7#.
Embodiment 5:
By rubber powder, softening oil, activator according to weight ratio 100:3:4 in homogenizer at 70 DEG C of pre-treatment 15min, be metered into the first screw extrusion press, through shear, reaction after from die extrusion deep activation rubber powder.Subsequently, liquid regeneration glue is metered into the second screw extrusion press by junctor, adjust hopper feed speed simultaneously and add SBS and interfacial compatibilizer according to SBS, deep activation rubber powder, interfacial compatibilizer weight ratio: 34:61:5, Homogeneous phase mixing, to extrude, through water-cooled preparation stable storing, ageing-resistant composite S BS particle.Each process parameter is substantially with embodiment 1.20% stable storing, ageing-resistant composite S BS particle is taken by matrix pitch weight ratio, to join in matrix pitch and to shear 5min, stirring subsequently adds the stablizer of 0.4% and breed 4 hours at 170-175 DEG C, the obtained particle modified pitch of composite S BS, numbering 8#.
Embodiment 6:
By rubber powder, softening oil, activator according to weight ratio 100:20:0.3 in homogenizer at 70 DEG C of pre-treatment 15min, be metered into the first screw extrusion press, through shear, reaction after from die extrusion deep activation rubber powder.Subsequently, deep activation rubber powder is metered into the second screw extrusion press by junctor, adjust hopper feed speed simultaneously and add SBS and interfacial compatibilizer according to SBS, deep activation rubber powder, interfacial compatibilizer weight ratio 38:56:6, Homogeneous phase mixing, to extrude, through water-cooled preparation stable storing, ageing-resistant composite S BS particle.Each process parameter is substantially with embodiment 1.25% stable storing, ageing-resistant composite S BS particle is taken by matrix pitch weight ratio, to join in matrix pitch and to shear 5min, stirring subsequently adds the stablizer of 0.4% and breed 4 hours at 170-175 DEG C, the obtained particle modified pitch of composite S BS, numbering 9#.
By the modified asphalt material prepared above respectively with the modified asphalt concrete mixing obtained AC-13 grating that gathers materials, by Marshall experiment, high-temperature stability experiment, water stability experiment, crack resistance at low-temperature experiment and four-point bending fatigue test, experimental result is as follows:
Table 1 modified asphalt concrete performance
The four-point bending fatigue test results of table 2 modified asphalt concrete
As can be seen from table 2 and table 3, the bitumen aggregate ratio of the particle modified pitch of 4#, 5#, 6#, 7#, 8#, 9# composite S BS in embodiment 1-6 does not have change substantially compared with 1#, 2#, the 3# in comparative example 1,2,3.But the water stability of the particle modified bituminous concrete of 4#, 5#, 6#, 7#, 8#, 9# composite S BS has larger improvement.Comparatively 1# conventional SBS modified asphalt concrete fatigue performance is more excellent for the particle modified bituminous concrete of 7#, 9# composite S BS simultaneously.Therefore, the Pavement Performance of the particle modified bituminous concrete of composite S BS of the present invention is better.
The above is only the preferred embodiment of the present invention, adopts aforesaid preferred processing condition, mass ratio and different additive component to carry out organizing test more, all can obtain the result of above-mentioned improvement.It should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (10)
1. a stable storing, the particle modified bituminous concrete of ageing-resistant composite S BS, it is characterized in that by gather materials and the particle modified pitch of composite S BS mixes, by mass ratio, wherein said modifying asphalt is that the pitch of 100:2-30:0.1-3, composite S BS particle and stablizer mix obtained; Described composite S BS particle comprises SBS, deep activation rubber powder, interfacial compatibilizer, its mass percent is 15-38:56-82:3-6, wherein said deep activation rubber powder by mass ratio be the waste Crumb rubber of 100:3-20:0.3-4, softening oil and activator extrude obtained by stirring.
2. modified asphalt concrete according to claim 1, it is characterized in that described waste Crumb rubber is obtained by one or more in damaged tire, useless hand cart tyre, useless conveying belt, scrap rubber footwear, particle size range is 0.1-10mm; Describedly gathering materials and the bitumen aggregate ratio of the particle modified pitch of composite S BS is 5.0-5.2, is AC-13 grating.
3. modified asphalt concrete according to claim 1, is characterized in that described softening oil is the mixture of one or more in Stockholm tar, naphthenic oil, Yatall MA, aromatic hydrocarbon oil, rosin.
4. modified asphalt concrete according to claim 1, is characterized in that described activator is one or several the mixture in phenyl disulfide, thiophenol, polyalkylbenzene phenol disulphide, octadecylamine.
5. modified asphalt concrete according to claim 1, it is characterized in that the sol content of described deep activation rubber powder is greater than 80%, mooney viscosity is less than 1, and Sol molecular weight is greater than 10,000.
6. modified asphalt concrete according to claim 1, is characterized in that described SBS to be molecular weight is that the hub-and-spoke configuration of 15-50 ten thousand and/or molecular weight are the linear structure of 5-25 ten thousand.
7. modified asphalt concrete according to claim 1, is characterized in that described interfacial compatibilizer is the mixture of one or more in Research of Grafting Malaic Anhydride Onto Polyethylene, ethylene-vinyl acetate copolymer, polyethylene, polypropylene, polyoxyethylene.
8., according to the preparation method of the arbitrary described a kind of stable storing of claim 1-7, the particle modified bituminous concrete of ageing-resistant composite S BS, it is characterized in that comprising the following steps:
To join in the first screw extrusion press after described rubber powder, softening oil, activator mix, stirring, control temperature be 100-380 DEG C, extrudes continuously, obtain deep activation rubber powder after shearing, reacting;
Join in the second screw extrusion press by described deep activation rubber powder and SBS and interfacial compatibilizer, control temperature, at 80-200 DEG C, is extruded after mixing, granulation is obtained composite S BS particle;
By asphalt heating to 160-180 DEG C, stir and add composite S BS particle heat-insulating premix 5-100 minute, shear 1-100 minute with velocity of shear 1000-10000 rev/min subsequently, in process, add stablizer;
Grow 60-300 minute with 100-500 rev/min of rapid stirring insulation, prepare modifying asphalt;
Modifying asphalt is joined obtained modified asphalt concrete in gathering materials.
9. method according to claim 8, it is characterized in that described first screw extrusion press is twin screw extruder, material pressure is 2-20MPa, and screw speed is 10rpm-300rpm, and the reaction times is 5-20min; Described second screw extrusion press is single screw extrusion machine, and screw speed is 10-200rpm, barrel pressure 2-20MPa.
10. method according to claim 8, is characterized in that described mixing, stirs to be with 50-100 DEG C of pre-treatment 10-30 minute in homogenizer.
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