CN109880386A - A kind of high-performance composite modified asphalt and preparation method thereof - Google Patents
A kind of high-performance composite modified asphalt and preparation method thereof Download PDFInfo
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Abstract
The invention belongs to road engineering material and environmental protection technical field, it is related to a kind of high-performance composite modified asphalt and preparation method thereof.The composite modified asphalt is by 80~95 parts of component As and 5~20 parts of B components of parts by weight, and wherein by 79.8~94.8 parts of matrix pitch of parts by weight, 0.2~2.5 part of polyphosphoric acid forms component A；B component is by 1~10 part of parts by weight regenerated polythene wax, and 0~8 part of rock asphalt, 0.1~5 part of filler, 0.5~8 part of rubber, 0~5 part of extraction oil forms.The method of the present invention prepares component A and B component respectively, is then added to B component in the component A for completing chemical modification, is sufficiently stirred to obtain the high-performance composite modified asphalt.Processing technology of the present invention is simple, processing temperature is low, process time is short, can produce in any mixing station, the index that high-temperature behavior meets or exceeds addition anti-rut agent simultaneously, and cryogenic property reaches even better than SBS modified pitch.
Description
Technical field
The invention belongs to road engineering material and environmental protection technical field, be related to a kind of high-performance composite modified asphalt and
Preparation method.
Background technique
Asphalt is widely used in each field such as transportation, construction industry, industry, and asphalt has such as high temperature
Easily softening, therefore, adds modifying agent to improve pitch at fragile under low temperature to split, the defects of performances such as ageing-resistant, antifatigue are not satisfactory
Performance is highly effective approach.
Currently, common asphalt modifier is SBS, but the volume of SBS will reach certain degree and just have preferably
Modified effect leads to SBS modified pitch higher cost so that the additive amount needed is big.Secondly SBS is to equipment and modified technique
More demanding, the patented technology of core equipment colloid mill is monopolized by external producer, leads to not only equipment price height, Er Qieshe
Standby later maintenance cost is also expensive.Again, processing temperature height, the long processing time of SBS modified pitch, a large amount of energy consumption are also led
Cause the modification cost of SBS modified pitch high.Meanwhile because SBS modified pitch belongs to physical modification, it is easy to happen isolation
Phenomenon causes the storage stability of SBS modified pitch poor, in addition the limitation of equipment and processing technology, many asphalts
Manufacturing enterprise cannot voluntarily produce, and need to buy in specific SBS manufacturing enterprise, and construction enterprises and SBS manufacturing enterprise
Apart from too far, it will lead to final SBS modified pitch performance after long-distance transport and substantially decay.
The research of the modified amount of polyphosphoric acid at home is more, and polyphosphoric acid modified pitch has good storage stability and high temperature
Stability, but a large number of studies show that, polyphosphoric acid modified pitch can make pitch premature aging, can reduce pitch to a certain extent
Cryogenic property, especially low-temperature ductility.
How while improving modified pitch high-temperature behavior, the cryogenic property for maintaining or improving modified pitch is always to grind
The hot issue studied carefully.It is such as that polyphosphoric acid addition SBS modified pitch architectural study is relatively more, replace part with cheap polyphosphoric acid
SBS, it is appropriate to reduce modified cost, but in the prior art without fundamentally changing SBS modified pitch to equipment and processing work
The limitation of skill, properties of product also do not change significantly, and cost reduces very limited.Therefore not by the approval of client, still
So rest on conceptual phase.
In order to improve the Pavement Performance of bituminous pavement, in Process of Pitch Mixture Production, Chang Tianjia various additives are such as
Anti-rut agent etc. is mixed and stirred by the machinery between gathering materials, and partial melting carries out pre- modification in surface of aggregate, to gathering materials, thus
The caking property gathered materials is improved, improves the softening point of pitch, viscosity increases, temperature sensitivity reduces.But from the angle of modified pitch
Degree, these additives are difficult to be uniformly dispersed in pitch, are easy conglomeration, and will appear modification in the process with storage in transit
The laminated segregation of agent and pitch causes the performance of modified pitch to decay rapidly, makes the three norms and cryogenic property of modified pitch
It is not able to satisfy road technical requirements.
Summary of the invention
In order to solve the problems in the existing technology, the invention proposes a kind of high-performance composite modified asphalt and its systems
Preparation Method, processing technology is simple, processing temperature is low, process time is short, can produce in any mixing station, high-temperature behavior reaches simultaneously
The index of anti-rut agent is even more than added, cryogenic property reaches even better than SBS modified pitch.
In order to solve the above-mentioned technical problem, the present invention adopts the following technical scheme that.
A kind of high-performance composite modified asphalt, it is grouped as by the group of following weight ratio: 80~95 parts of component A, B component 5
~20 parts, wherein component A is grouped as by the group of following parts by weight: 79.8~94.8 parts of matrix pitch, 0.2~2.5 part of polyphosphoric acid；
B component is grouped as by the group of following parts by weight: 1~10 part of regenerated polythene wax, 0~8 part of rock asphalt, and 0.1~5 part of filler, rubber
0.5~8 part of glue, 0~5 part of extraction oil.
Further, phosphorus acid content >=95% in the polyphosphoric acid.
Further, the regenerated polythene wax is the mixed of the one or two of high density polyethylene (HDPE), low density polyethylene (LDPE)
Product after closing object cracking, fusing point are 100~160 DEG C.
Further, the rock asphalt is natural rock asphalt.
Further, the filler is the mixture of one or both of carbon black, calcium carbonate.
Further, the rubber is in the waste rubber powder of natural rubber, butadiene-styrene rubber, neoprene or 40 mesh or more
One or more mixtures.
On the other hand, the preparation method of a kind of high-performance composite modified asphalt of the invention, the preparation method each component are pressed
It stocks up according to by parts by weight above-mentioned, prepares component A and B component respectively, then B component is added to the A group for completing chemical modification
In point, 1~4h is sufficiently stirred, obtains the high-performance composite modified asphalt；The component A the preparation method comprises the following steps: by matrix
Pitch heats fusing at a temperature of 130~165 DEG C, and polyphosphoric acid is added under agitation and carries out 10~60min of chemical reaction；Institute
The preparation method for stating B component is that after matching regenerated polythene wax, rock asphalt, filler, rubber, extraction oil while twin-screw is added
Extruder is prepared into composite modifier particle by screw extruder mixing, heating, shearing, molding, pelletizing process.
Further, mixing speed when polyphosphoric acid being added in component A is 200~300r/min.
Further, by B component be added to complete chemical modification component A in be sufficiently stirred mix speed be 200~
300r/min。
Modified pitch prepared by the present invention can use immediately, can also cool down long term storage, when use need to be heated to 130 DEG C with
On, it uses after mixing evenly.The present invention is by the separate machined of component A and B component, chemical modification, physical modification and special
The control of fabrication process condition makes pitch modification technique become simple and easy, and processing cost significantly reduces, the high temperature of modified pitch
Performance significantly improves, and effectively improves the service performance and endurance quality of pavement material.
In the present invention, when preparing component A, chemical modification can be carried out to pitch with polyphosphoric acid in a short time, be formed and stablized
Sol-gel structures, be unlikely to lead to the overaging of pitch.B component reaches to the equal of polymer material rubber additive
Even dispersion and pre- modification eliminate polymer material segregation phenomenon generally existing in pitch, avoid polymer modified asphalt
Required shear at high temperature and long-time swelling process.The present invention passes through the chemical modification, physical modification and processing technology item
The control of part, 70 DEG C of the softening point > of the high-performance composite modified asphalt of acquisition, 25 DEG C of needle penetrations are 40~60/0.1mm, 10 DEG C
Ductility > 50cm, modified asphalt mixture dynamic stability 8000 times/mm of >, low-temperature bending strain > 2500u ε.The method of the present invention
Simple process does not need colloid mill, and processing temperature is low, process time is short, can produce in any mixing station, makes full use of each
The advantage of component significantly reduces the modification cost of road asphalt.
Compared with prior art, it is had the beneficial effect that caused by the present invention.
(1) present invention carries out chemical modification to pitch first with polyphosphoric acid, passes through polyphosphoric acid and pitch in component A
In active function groups between react and generate new chemical bond or chemical group, change activity, the strand form of pitch
And molecular weight of pitch etc., to fundamentally change the technical performance of pitch.The time chemically reacted by strict control,
Chemical modification is carried out to pitch with polyphosphoric acid in short time, forms stable sol-gel structures, while being unlikely to anti-for a long time
It should lead to the overaging of pitch.The heat resistance, chemical resistance and the wearability that make full use of polyethylene wax excellent in B component,
Excellent external lubricity and the effect of stronger internal lubrication, so as to improve the dispersibility of other polymeric additives and filler.
Pre- modification is carried out to rock asphalt, filler, rubber etc. by polyethylene wax, be stabilized composite modifier can in pitch, no
Segregation phenomenon can occur.
(2) in the pre- modifying process of B component, shearing point is carried out to a small amount of rubber-like material using double screw extruder
It dissipates, is cooled and shaped, processing capacity significantly reduces, process time substantially shortens.During avoiding traditional SBS modified pitch, need
The a large amount of asphalt systems that joined SBS modifier were developed by colloid mill shearing and prolonged swelling at high temperature
Journey not only reduces energy consumption, energy saving, while substantially shortening the process-cycle of modified pitch.
(3) present invention makes pitch modification technique by A early period, the separate machined of B component, the processing technology of later period mixing
Become simple, the processing of two components, which can separate, to be carried out.The processing of component A is easier, and the simultaneous processing time is very short, general
It just can be carried out on logical asphalt storage；B component processing capacity is few, product storage can be made, on-demand, modified technique is very clever
It is living.Meanwhile component A and B component hybrid technique are simple, it is only necessary to which circulation is it is achieved that common in normal agitation or system
Asphalt mixture mixing station is with regard to implementable, and operation temperature is suitable with matrix pitch, to avoid polymer modified asphalt raw
It produces and needs the investment such as a large amount of capital construction, equipment, heat source, use scope substantially expands.
(4) in modified pitch preparation process of the present invention, processing temperature only has 130-165 DEG C, with matrix pitch
It is suitable using temperature, far below 180-200 DEG C of conventional polymer modified asphalt, it can substantially save energy consumption, be one
The environmental-friendly modification technology of kind.
(5) high-performance composite modified asphalt that the present invention obtains has met or exceeded the modified drip of SBS from pitch index
Green base values, 70 DEG C of softening point >, 25 DEG C of needle penetrations are 40~60/0.1mm, 10 DEG C of ductility > 50cm；From modified pitch
It is seen in the index of mixture, has met or exceeded the pavement performance index of addition anti-rut agent etc., dynamic stability > 8000 times/
Mm, low-temperature bending strain > 2500u ε, obtain polymer modified asphalt and the dual of anti-rut agent modified asphalt mixture changes
The purpose of property.
The present invention make full use of each component Wuli-Shili-Renli system approach and special control process condition, give full play to
The advantage of each component, at the same avoid when each component is used alone there are the problem of, obtain that high temperature performance is excellent changes
Property pitch.This method simple production process, temperature is low for production, energy consumption and production cost are remarkably decreased, and it is big to be very suitable to non-batch
The highway engineering of scale.
Specific embodiment
The present invention provides a kind of high-performance composite modified asphalts and preparation method thereof, in order to make the purpose of the present invention, skill
Art scheme and advantage become apparent from, are clear, and below with reference to specific embodiment, the present invention is described in more detail, but unlimited
In embodiment.
Embodiment 1
It is weighed according to following weight raw materials used: 82 parts of matrix pitch, 1.5 parts of polyphosphoric acid, 3 parts of regenerated polythene wax, rock
2 parts of pitch, 1.5 parts of calcium carbonate, 8 parts of powder styrene butadiene rubber, 2 parts of extraction oil.
Modified pitch is prepared using following steps: 1) preparation method of component A: matrix pitch being heated at 160 DEG C molten
Change, polyphosphoric acid is added and stirs 30min under the conditions of 250r/min, completes chemical modification.2) it the preparation method of B component: will regenerate
Double screw extruder is added according to certain formula in polyethylene wax, rock asphalt, filler, rubber, extraction oil etc., by Screw Extrusion
Machine mixing, heating, shearing, molding, pelletizing process are prepared into composite modifier particle.3) A being added to B component at 160 DEG C
In component, 4h is stirred under the conditions of 250r/min, obtains the high-performance composite modified asphalt.
The technical indicator for the modified pitch being prepared is shown in Table 1.
Embodiment 2
Weighed according to following weight raw materials used: 86.5 parts of matrix pitch, 0.5 part of polyphosphoric acid, 3 parts of regenerated polythene wax,
3 parts of rock asphalt, 2 parts of carbon black, 1 part of natural rubber, 4 parts of extraction oil.
Modified pitch is prepared using following steps: 1) preparation method of component A: matrix pitch being heated at 130 DEG C molten
Change, polyphosphoric acid is added and stirs 1h under the conditions of 200r/min, completes chemical modification.2) poly- second will the preparation method of B component: be regenerated
Double screw extruder is added according to certain formula in alkene wax, rock asphalt, filler, rubber, extraction oil etc., mixed by screw extruder
It closes, heating, shearing, form, pelletizing process is prepared into composite modifier particle.3) component A being added to B component at 130 DEG C
In, 2h is stirred under the conditions of 200r/min, obtains the high-performance composite modified asphalt.
The technical indicator for the modified pitch being prepared is shown in Table 1.
Embodiment 3
It is weighed according to following weight raw materials used: 80 parts of matrix pitch, 1.5 parts of polyphosphoric acid, 10 parts of regenerated polythene wax, rock
1 part of pitch, 4 parts of carbon black, 2 parts of neoprene, 1.5 parts of extraction oil.
Modified pitch is prepared using following steps: 1) preparation method of component A: matrix pitch being heated at 165 DEG C molten
Change, polyphosphoric acid is added and stirs 20min under the conditions of 250r/min, completes chemical modification.2) it the preparation method of B component: will regenerate
Double screw extruder is added according to certain formula in polyethylene wax, rock asphalt, filler, rubber, extraction oil etc., by Screw Extrusion
Machine mixing, heating, shearing, molding, pelletizing process are prepared into composite modifier particle.3) A being added to B component at 165 DEG C
In component, 3h is stirred under the conditions of 250r/min, obtains the high-performance composite modified asphalt.
The technical indicator for the modified pitch being prepared is shown in Table 1.
Embodiment 4
It is weighed according to following weight raw materials used: 82.9 parts of matrix pitch, 2 parts of polyphosphoric acid, 1 part of regenerated polythene wax, rock
8 parts of pitch, 0.1 part of calcium carbonate, 1 part of powder styrene butadiene rubber, 5 parts of extraction oil.
Modified pitch is prepared using following steps: 1) preparation method of component A: matrix pitch being heated at 140 DEG C molten
Change, polyphosphoric acid is added and stirs 40min under the conditions of 300r/min, completes chemical modification.2) it the preparation method of B component: will regenerate
Double screw extruder is added according to certain formula in polyethylene wax, rock asphalt, filler, rubber, extraction oil etc., by Screw Extrusion
Machine mixing, heating, shearing, molding, pelletizing process are prepared into composite modifier particle.3) A being added to B component at 140 DEG C
In component, 1h is stirred under the conditions of 300r/min, obtains the high-performance composite modified asphalt.
The technical indicator for the modified pitch being prepared is shown in Table 1.
Embodiment 5
It is weighed according to following weight raw materials used: 89 parts of matrix pitch, 0.5 part of polyphosphoric acid, 4 parts of regenerated polythene wax, rock
3 parts of pitch, 2 parts of calcium carbonate, 0.5 part of powder butylbenzene rubber, 1 part of extraction oil.
Modified pitch is prepared using following steps: 1) preparation method of component A: matrix pitch being heated at 140 DEG C molten
Change, polyphosphoric acid is added and stirs 10min under the conditions of 250r/min, completes chemical modification.2) it the preparation method of B component: will regenerate
Double screw extruder is added according to certain formula in polyethylene wax, rock asphalt, filler, rubber, extraction oil etc., by Screw Extrusion
Machine mixing, heating, shearing, molding, pelletizing process are prepared into composite modifier particle.3) A being added to B component at 140 DEG C
In component, 3h is stirred under the conditions of 250r/min, obtains the high-performance composite modified asphalt.
The technical indicator for the modified pitch being prepared is shown in Table 1.
Embodiment 6
It is weighed according to following weight raw materials used: 87 parts of matrix pitch, 2.5 parts of polyphosphoric acid, 1 part of regenerated polythene wax, rock
1 part of pitch, 0.5 part of carbon black, 6 parts of neoprene, 2 parts of extraction oil.
Modified pitch is prepared using following steps: 1) preparation method of component A: matrix pitch being heated at 150 DEG C molten
Change, polyphosphoric acid is added and stirs 60min under the conditions of 250r/min, completes chemical modification.2) it the preparation method of B component: will regenerate
Double screw extruder is added according to certain formula in polyethylene wax, rock asphalt, filler, rubber, extraction oil etc., by Screw Extrusion
Machine mixing, heating, shearing, molding, pelletizing process are prepared into composite modifier particle.3) A being added to B component at 150 DEG C
In component, 3.5h is stirred under the conditions of 250r/min, obtains the high-performance composite modified asphalt.
The technical indicator for the modified pitch being prepared is shown in Table 1.
Embodiment 7
It is weighed according to following weight raw materials used: 94.8 parts of matrix pitch, 0.2 part of polyphosphoric acid, regenerated polythene wax 2.5
Part, 1 part of carbon black, 1.5 parts of 40 mesh rubber powder.
Modified pitch is prepared using following steps: 1) preparation method of component A: matrix pitch being heated at 150 DEG C molten
Change, polyphosphoric acid is added and stirs 20min under the conditions of 250r/min, completes chemical modification.2) it the preparation method of B component: will regenerate
Double screw extruder is added according to certain formula in polyethylene wax, filler, rubber etc., mixes, heats, cuts by screw extruder
It cuts, form, pelletizing process is prepared into composite modifier particle.3) B component is added in the component A at 150 DEG C, in 250r/
2h is stirred under the conditions of min, obtains the high-performance composite modified asphalt.
The technical indicator for the modified pitch being prepared is shown in Table 1.
Embodiment 8
It is weighed according to following weight raw materials used: 83 parts of matrix pitch, 1 part of polyphosphoric acid, 3.5 parts of regenerated polythene wax, rock
1.5 parts of pitch, 5 parts of calcium carbonate, 2 parts of natural rubber, 4 parts of extraction oil.
Modified pitch is prepared using following steps: 1) preparation method of component A: matrix pitch being heated at 150 DEG C molten
Change, polyphosphoric acid is added and stirs 20min under the conditions of 250r/min, completes chemical modification.2) it the preparation method of B component: will regenerate
Double screw extruder is added according to certain formula in polyethylene wax, rock asphalt, filler, rubber, extraction oil etc., by Screw Extrusion
Machine mixing, heating, shearing, molding, pelletizing process are prepared into composite modifier particle.3) A being added to B component at 150 DEG C
In component, 2h is stirred under the conditions of 300r/min, obtains the high-performance composite modified asphalt.
The technical indicator for the modified pitch being prepared is shown in Table 1.
The modified pitch indices that 1 embodiment 1-8 of table is prepared
From table 1 it follows that the softening point for the high-performance composite modified asphalt that each embodiment is prepared is 70
DEG C or more, 8000 times/mm of dynamic stability >, low-temperature bending strains > 2500u ε, illustrates that its high temperature performance is more outstanding.
In conclusion inventive formulation is flexible and changeable, adapt to various conditions requirements, can according to use condition such as weather,
Axis carries, and the particular/special requirement of volume of traffic etc. customizes corresponding modified pitch.
The above embodiments are merely illustrative of the technical solutions of the present invention, rather than is limited；Although referring to aforementioned reality
Applying example, invention is explained in detail, for those of ordinary skill in the art, still can be to aforementioned implementation
Technical solution documented by example is modified or equivalent replacement of some of the technical features；And these are modified or replace
It changes, the spirit and scope for claimed technical solution of the invention that it does not separate the essence of the corresponding technical solution.
Claims (9)
1. a kind of high-performance composite modified asphalt, which is characterized in that it is grouped as by the group of following weight ratio: component A 80~95
Part, 5~20 parts of B component, wherein component A is grouped as by the group of following parts by weight: 79.8~94.8 parts of matrix pitch, polyphosphoric acid
0.2~2.5 part；B component is grouped as by the group of following parts by weight: 1~10 part of regenerated polythene wax, 0~8 part of rock asphalt, and filler
0.1~5 part, 0.5~8 part of rubber, 0~5 part of extraction oil.
2. a kind of high-performance composite modified asphalt according to claim 1, which is characterized in that the phosphoric acid in the polyphosphoric acid
Content >=95%.
3. a kind of high-performance composite modified asphalt according to claim 1, which is characterized in that the regenerated polythene wax is
Product after the mixtures cracking of the one or two of high density polyethylene (HDPE), low density polyethylene (LDPE), fusing point are 100~160 DEG C.
4. a kind of high-performance composite modified asphalt according to claim 1, which is characterized in that the rock asphalt is natural rock
Pitch.
5. a kind of high-performance composite modified asphalt according to claim 1, which is characterized in that the filler is carbon black, carbon
The mixture of one or both of sour calcium.
6. a kind of high-performance composite modified asphalt according to claim 1, which is characterized in that the rubber is natural rubber
One of waste rubber powder more than glue, butadiene-styrene rubber, neoprene or 40 mesh or a variety of mixtures.
7. a kind of preparation method of high-performance composite modified asphalt, which is characterized in that the preparation method each component is according to by right
It is required that 1,2,3,4,5 or 6 parts by weight are stocked up, component A and B component are prepared respectively, and B component is then added to completion chemistry and is changed
Property component A in, 1~4h is sufficiently stirred, obtains the high-performance composite modified asphalt；The component A the preparation method comprises the following steps:
Matrix pitch is heated to fusing at a temperature of 130~165 DEG C, under agitation be added polyphosphoric acid carry out chemical reaction 10~
60min；The preparation method of the B component is that will add simultaneously after regenerated polythene wax, rock asphalt, filler, rubber, extraction oil proportion
Enter double screw extruder, is prepared into composite modifier by screw extruder mixing, heating, shearing, molding, pelletizing process
Grain.
8. a kind of preparation method of high-performance composite modified asphalt according to claim 7, which is characterized in that in component A
Mixing speed when polyphosphoric acid is added is 200~300r/min.
9. a kind of preparation method of high-performance composite modified asphalt according to claim 7, which is characterized in that by B component
Being added to the speed of mixing being sufficiently stirred in the component A for completing chemical modification is 200~300r/min.
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Cited By (1)
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| CN109880386B (en) | 2022-02-18 |
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