CN106589986B - Modified pitch and its preparation method and application - Google Patents
Modified pitch and its preparation method and application Download PDFInfo
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- CN106589986B CN106589986B CN201611022260.4A CN201611022260A CN106589986B CN 106589986 B CN106589986 B CN 106589986B CN 201611022260 A CN201611022260 A CN 201611022260A CN 106589986 B CN106589986 B CN 106589986B
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- 238000002360 preparation method Methods 0.000 title claims abstract description 22
- 239000010426 asphalt Substances 0.000 claims abstract description 76
- 239000003381 stabilizer Substances 0.000 claims abstract description 22
- 239000003607 modifier Substances 0.000 claims abstract description 11
- SIXWIUJQBBANGK-UHFFFAOYSA-N 4-(4-fluorophenyl)-1h-pyrazol-5-amine Chemical compound N1N=CC(C=2C=CC(F)=CC=2)=C1N SIXWIUJQBBANGK-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000005062 Polybutadiene Substances 0.000 claims description 60
- 229920002857 polybutadiene Polymers 0.000 claims description 60
- 239000000203 mixture Substances 0.000 claims description 37
- 238000003756 stirring Methods 0.000 claims description 16
- 238000010008 shearing Methods 0.000 claims description 12
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical group [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 10
- 239000004793 Polystyrene Substances 0.000 claims description 9
- 238000002156 mixing Methods 0.000 claims description 9
- 229920002223 polystyrene Polymers 0.000 claims description 8
- 229920006395 saturated elastomer Polymers 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 5
- 229910052717 sulfur Inorganic materials 0.000 claims description 2
- 239000011593 sulfur Substances 0.000 claims description 2
- 125000003118 aryl group Chemical group 0.000 claims 3
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims 2
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims 1
- 230000032683 aging Effects 0.000 abstract description 28
- 230000002929 anti-fatigue Effects 0.000 abstract description 8
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 230000003712 anti-aging effect Effects 0.000 abstract description 2
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000010924 continuous production Methods 0.000 abstract description 2
- 239000003795 chemical substances by application Substances 0.000 description 28
- 238000002474 experimental method Methods 0.000 description 18
- 238000012360 testing method Methods 0.000 description 17
- 230000035515 penetration Effects 0.000 description 10
- 229920000642 polymer Polymers 0.000 description 10
- 239000000126 substance Substances 0.000 description 10
- 239000005864 Sulphur Substances 0.000 description 7
- 125000002915 carbonyl group Chemical group [*:2]C([*:1])=O 0.000 description 7
- 239000003205 fragrance Substances 0.000 description 6
- 230000003647 oxidation Effects 0.000 description 6
- 238000007254 oxidation reaction Methods 0.000 description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 5
- 239000000470 constituent Substances 0.000 description 5
- 229910052816 inorganic phosphate Inorganic materials 0.000 description 5
- 230000001590 oxidative effect Effects 0.000 description 5
- 229910052760 oxygen Inorganic materials 0.000 description 5
- 239000001301 oxygen Substances 0.000 description 5
- 150000001336 alkenes Chemical class 0.000 description 4
- 230000033228 biological regulation Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- XNGIFLGASWRNHJ-UHFFFAOYSA-N phthalic acid Chemical compound OC(=O)C1=CC=CC=C1C(O)=O XNGIFLGASWRNHJ-UHFFFAOYSA-N 0.000 description 4
- 239000011347 resin Substances 0.000 description 4
- 229920005989 resin Polymers 0.000 description 4
- KAKZBPTYRLMSJV-UHFFFAOYSA-N Butadiene Chemical compound C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 description 3
- 239000011203 carbon fibre reinforced carbon Substances 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 230000018109 developmental process Effects 0.000 description 3
- 239000006185 dispersion Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000002904 solvent Substances 0.000 description 3
- 238000004073 vulcanization Methods 0.000 description 3
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
- 230000003679 aging effect Effects 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229920001971 elastomer Polymers 0.000 description 2
- 150000002148 esters Chemical class 0.000 description 2
- 230000009477 glass transition Effects 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 description 2
- 238000013001 point bending Methods 0.000 description 2
- 229920001021 polysulfide Polymers 0.000 description 2
- 239000005077 polysulfide Substances 0.000 description 2
- 150000008117 polysulfides Polymers 0.000 description 2
- 239000005060 rubber Substances 0.000 description 2
- DYLIWHYUXAJDOJ-OWOJBTEDSA-N (e)-4-(6-aminopurin-9-yl)but-2-en-1-ol Chemical compound NC1=NC=NC2=C1N=CN2C\C=C\CO DYLIWHYUXAJDOJ-OWOJBTEDSA-N 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- -1 butadiene Alkene Chemical class 0.000 description 1
- CREMABGTGYGIQB-UHFFFAOYSA-N carbon carbon Chemical compound C.C CREMABGTGYGIQB-UHFFFAOYSA-N 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000007697 cis-trans-isomerization reaction Methods 0.000 description 1
- 238000003181 co-melting Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009661 fatigue test Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 229920005621 immiscible polymer blend Polymers 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 238000006213 oxygenation reaction Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000002304 perfume Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 238000005381 potential energy Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 150000003254 radicals Chemical class 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 235000013599 spices Nutrition 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 229920003048 styrene butadiene rubber Polymers 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 229920002725 thermoplastic elastomer Polymers 0.000 description 1
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
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C7/00—Coherent pavings made in situ
- E01C7/08—Coherent pavings made in situ made of road-metal and binders
- E01C7/18—Coherent pavings made in situ made of road-metal and binders of road-metal and bituminous binders
- E01C7/26—Coherent pavings made in situ made of road-metal and binders of road-metal and bituminous binders mixed with other materials, e.g. cement, rubber, leather, fibre
- E01C7/265—Coherent pavings made in situ made of road-metal and binders of road-metal and bituminous binders mixed with other materials, e.g. cement, rubber, leather, fibre with rubber or synthetic resin, e.g. with rubber aggregate, with synthetic resin binder
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Architecture (AREA)
- Materials Engineering (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
本发明提供了一种改性沥青及其制备方法和应用，其包括以下重量份：沥青100份、线型SBS改性剂3.5‐6.5份、稳定剂0.15‐0.3份、辅助稳定剂0.1‐0.15份和邻苯二甲酸二异辛酯1‐2份。本发明制备的改性沥青相比普通改性沥青来说具有显著的稳定性、耐老化性能、优异的抗热氧老化性能、抗车辙性能和抗疲劳性能等特点。在实际应用时，本发明的制备工序有利于工业上进行连续生产，从而提高生产效率。The present invention provides a modified asphalt and a preparation method and application thereof, comprising the following parts by weight: 100 parts of asphalt, 3.5-6.5 parts of linear SBS modifier, 0.15-0.3 parts of stabilizer, and 0.1-0.15 parts of auxiliary stabilizer parts and 1-2 parts of diisooctyl phthalate. Compared with ordinary modified asphalt, the modified asphalt prepared by the invention has the characteristics of remarkable stability, anti-aging performance, excellent anti-thermal-oxidative aging performance, anti-rutting performance and anti-fatigue performance. In practical application, the preparation process of the present invention is beneficial to industrial continuous production, thereby improving production efficiency.
Description
Technical field
The invention belongs to pitch manufacturing technology fields, and in particular to a kind of modified pitch and its preparation method and application.
Background technique
Since traditional asphalt has been difficult to reach the requirement of Modern Traffic road pavement quality, occurs various aspects of performance in recent years
Better than the modified pitch of traditional asphalt.It is modified according to " highway Construction of Modified Asphalt Pavement technical specification " (JTJO36-98) standard
Pitch refers to that " rubber, resin, high molecular polymer, levigate rubber powder or other fillers etc. are outer to be mixed by adding into pitch
Measures such as " processing to pitch mild oxidation " are taken in agent (modifying agent) ", " change the performance of pitch or asphalt
It is kind " and manufactured asphalt binder.Wherein, thermoplastic elastomer class modified pitch, especially one styrene of styrene-butadiene
Block copolymer (SBS) modified pitch, is most widely used, accounts for the 40% of modified pitch total amount.
SBS modified pitch generally faces the bad problem of storage property in use, needs to add stabilizer to enhance
Thermal stability.A large number of studies show that SBS modifier does not chemically react with pitch, but uniformly it is scattered in pitch
In, only in physical significance coexist it is co-melting.Therefore SBS modifier physical dispersion state is substantially in pitch, i.e., with
Fine particle is distributed in pitch.Since SBS modifier and pitch have difference in molecular weight, chemical structure, they
Belong to thermodynamics Immiscible Polymer Blends.This system is not sufficiently stable, and is easy to appear the problem of SBS modifier is precipitated from pitch.For
This problem is avoided, heat-staple gather industrially often is prepared by adding the stabilizer that can be chemically crosslinked with polymer
Object and then modified pitch are closed, wherein elemental sulfur is the stabilizer most generally used.
However, studies have shown that the incorporation of sulphur will lead to influence of the modified pitch more easily by photo-thermal and load, occur
The phenomenon that aging is denaturalized, influences its Long Service Life.This is mainly due to the sulfur molecules in sulphur to be easier under heat condition
Free radical is generated, and chemical crosslink reaction can occur with the carbon-carbon double bond of butadiene in SBS modifier molecule, is with polysulfide key
Connection chain is between polymer molecule and intramolecular is crosslinked, and forms the polymer network shape structure of crosslinking.However polysulfide key
Bond distance it is very long, bond energy is lower, thermo-oxidative ageing effect under than common carbon-carbon double bond be easier be broken, so as to cause institute
The polymer network shape structure of generation is degraded；The degradation and decomposition of polymer also can dramatically weaken the road of modified pitch
With performance, uncontrollable pavement damage result is caused.
Summary of the invention
In view of the deficiencies of the prior art, primary and foremost purpose is to provide a kind of modified pitch to the present invention.
Second object of the present invention is to provide a kind of preparation method and application of modified pitch.
In order to achieve the above objectives, solution of the invention is:
A kind of modified pitch comprising following parts by weight:
Preferably, pitch is straight asphalt.
Preferably, pitch contains saturation point, fragrance point, resin and asphalt, wherein saturation divides content to be 8-16%, virtue
Perfume (or spice) divides content to be 35-45%, gum level 25-30%, asphalt content 12-20%.
Preferably, it is saturated point content in pitch and fragrance divides the summation of content to be 45-55%.
Preferably, type SBS modifying agent is made of polybutadiene segments and polystyrene chain segment.
Preferably, the block ratio of polystyrene and polybutadiene is 3:7-4:6 in type SBS modifying agent.
Preferably, polybutadiene segments are made of cis polybutadiene, trans polybutadiene and end polybutadiene.
Preferably, cis polybutadiene is 10-20wt% in the content of polybutadiene segments.
Preferably, trans polybutadiene is 75-85wt% in the content of polybutadiene segments.
Preferably, end polybutadiene is 2-10wt% in the content of polybutadiene segments.
Preferably, stabilizer is sulphur.
Preferably, auxiliary stabilizer is inorganic phosphate.
A kind of preparation method of modified pitch comprising following steps:
(1), pitch is mixed with type SBS modifying agent, shears, obtains the first mixture；
(2), stabilizer is added in the first mixture and auxiliary stabilizer mixes and stirs, obtain the second mixture；
(3), after the modified solvent swell development of type SBS, diisooctyl phthalate is added in the second mixture, stirs
Modified pitch is obtained after mixing.
Preferably, in step (1), the temperature of shearing is 200-220 DEG C, and the speed of shearing is 1500-1800 revs/min,
The time of shearing is 3-5h.
Preferably, in step (2), the temperature mixed and stirred is 180-220 DEG C, and the time mixed and stirred is 1-2h.
Preferably, in step (3), the time of stirring is 1-2h.
A kind of modified pitch prepared by the preparation method is applied in road surface.
By adopting the above scheme, the beneficial effects of the present invention are:
The first, the present invention is respectively defined the chemical constituent of modifying agent and pitch, is guaranteeing and traditional type SBS
When the consistent pavement performance of modified pitch, modified pitch prepared by the present invention shows significant stability and resistance to ag(e)ing
Energy.
The second, modified pitch prepared by the present invention is after it experienced indoor simulation heat ageing and ultraviolet ageing environment, property
The performance that ratio is significantly lower than modified asphalt can be reduced；Modified pitch prepared by the present invention is being tested and is being resisted by Rut resistance
After fatigue test, dynamic stability growth degree and fatigue life reduce degree and are significantly lower than the dynamic of modified asphalt mixture
Steady growth degree and fatigue life reduce degree, and therefore, modified pitch prepared by the present invention has excellent thermo oxidative aging
Performance, anti-rut behavior and anti-fatigue performance.
The preparation section of third, the preparation section of modified pitch of the invention and modified asphalt is not much different, in reality
Border is in application, preparation section of the invention is conducive to industrially carry out continuous production, to improve production efficiency.
In short, stabilizer and auxiliary stabilizer are added in preparation process of the invention, so that modification prepared by the present invention
Pitch compared to have excellent stability for modified asphalt, ageing-resistant performance, thermo oxidative aging performance, anti-rut behavior
And the features such as anti-fatigue performance；It, the case where being less prone to isolation, can in addition, the stay in grade of modified pitch prepared by the present invention
Phenomena such as to effectively reduce the fatigue cracking occurred after road surface is runed for a long time, so that construction be made to become easy.
Specific embodiment
The present invention provides a kind of modified pitch and its preparation method and application.
<modified pitch>
A kind of modified pitch comprising following parts by weight:
Wherein, pitch can be straight asphalt, and preferably No. 70 asphalt, softening point is 46.3 DEG C, 25 DEG C of needle
In-degree is 68.
Pitch contains saturation point, fragrance point, resin and asphalt, wherein saturation divides content to be 8-16%, and fragrance divides content
For 35-45%, gum level 25-30%, asphalt content 12-20%.
It is saturated point content in pitch and fragrance divides the summation of content that can be 45-55%, wherein saturation divides content small
In 14%, preferably smaller than 9%.
Since cis-form olefin has more outstanding crimp property and bitumen compatibility compared to trans olefins, in type SBS
During the mixing and stirring of modifying agent and pitch, more likely there is polymer segregation point in the higher type SBS modifying agent of trans ratios
The problem of layer.Compatibility in order to guarantee type SBS modifying agent and pitch is good, and the saturation point content in pitch should be less than 14%,
Saturation divides content higher, more influences the compatibility of type SBS modifying agent and pitch entirety, the content therefore, in pitch being saturated point
Preferably smaller than 9%, and then the mixing uniformity and stability of type SBS modifying agent and pitch can be significantly improved.
Type SBS modifying agent is made of polybutadiene (PB) segment and polystyrene (PS) segment.
PS segment is hard section, and the main physical strength for providing polymer simultaneously guarantees its high-temperature behavior, glass transition temperature 80-
It 100 DEG C, is embedded in pitch macromolecular structure inside, chemical property is stablized, and the influence of external environment is not easily susceptible to.
PB segment is soft segment, the main function of realizing the bending deformation in pitch of type SBS modifying agent, glass transition temperature
It is -106 DEG C；The property of type SBS modifying agent, which changes, mainly to be caused by the variation of PB segment, PB segment richness carbon-carbon double
Key is easy to aging under oxygen attack and the phenomenon that fracture is decomposed occurs, type SBS modifying agent is caused to lose modified effect.
The block ratio of polystyrene and polybutadiene can be 3:7-4:6, preferably 3:7 in type SBS modifying agent.
Polybutadiene segments are made of cis polybutadiene, trans polybutadiene and end polybutadiene.
Cis polybutadiene, trans polybutadiene and end polybutadiene configuration formula are as follows:
Cis polybutadiene:
Trans polybutadiene:
End polybutadiene:
Wherein, the sum of content of cis polybutadiene, trans polybutadiene and end polybutadiene is 100wt%.
Cis polybutadiene can be 10-20wt% in the content of polybutadiene segments.
Trans polybutadiene can be 75-85wt% in the content of polybutadiene segments.
End polybutadiene can be 2-10wt% in the content of polybutadiene segments.
Polymer be easy to occur under the extreme conditions such as hot oxygen or vulcanization cis-structure converted to transconfiguration it is suitable
Trans isomerism phenomenon.In general, transisomer can be higher than in syn-isomerism body, poor thermal stability is shown, in foot
It is enough it is high at a temperature of, after supplementing enough energy, just will appear cis-trans isomerization phenomenon.Under vulcanization or hot oxygen environment, gather
It is possible that variation, it is lower, more stable trans- that part cis-form olefin can be converted into potential energy for Cis-trans structures in butadiene
Alkene, and then the chemical structure of polymer is caused to change.
The higher polybutadiene segments of trans ratios show better stabilization under the conditions of thermo-oxidative ageing and ultraviolet ageing
Property, while its ratio that aging rice seed occurs under sulphur effect is also lower, when the content of trans polybutadiene is more than 70%,
The anti-aging property of modified pitch is significantly improved, and therefore, the ratio of cis-trans isomerism structure is dripping modifying agent in PB segment
Compatibility and oxidation resistance in blueness have larger impact.
Stabilizer can be sulphur.
Auxiliary stabilizer can be inorganic phosphate, because salt of the addition including inorganic phosphate can accelerate line style
The dispersion of SBS modifier prevents its agglomerate and isolation to a certain extent.
Diisooctyl phthalate is commonly used for plasticizer use in plastic cement, Resin Industry.Phthalic acid two is different
The addition of monooctyl ester can increase substantially the compatibility of transconfiguration advantage type SBS modifying agent and pitch, so that as dispersion
The type SBS modifying agent of phase be distributed in pitch it is more uniform, thus reduce vulcanization stabilizer dosage, reduce asphalt viscosity,
Improve the easy degree of construction.
Diisooctyl phthalate structural formula is as follows:
<preparation method of modified pitch>
A kind of preparation method of modified pitch comprising following steps:
(1), pitch is mixed with type SBS modifying agent, shears, obtains the first mixture；
(2), stabilizer is added in the first mixture and auxiliary stabilizer mixes and stirs, obtain the second mixture；
(3), after the modified solvent swell development of type SBS, diisooctyl phthalate is added in the second mixture, stirs
Modified pitch is obtained after mixing.
Wherein, in step (1), the temperature of shearing can be 200-220 DEG C, and preferably 210 DEG C, the speed of shearing can be with
It is 1500-1800 revs/min, preferably 1800 revs/min, the time of shearing can be 3-5h, preferably 4h.
In step (2), the temperature mixed and stirred can be 180-220 DEG C, and preferably 180 DEG C, the time mixed and stirred can be 1-
2h, preferably 2h.
In step (3), the time of stirring can be 1-2h, preferably 2h.
<application of modified pitch>
A kind of modified pitch prepared by the preparation method can be applied in road surface.
Below in conjunction with illustrated embodiment and comparative example, the present invention is further illustrated.
Embodiment:
The preparation method of the modified pitch of the present embodiment comprising following steps:
(1), 100 parts of No. 70 asphalt are mixed with 4 parts of type SBS modifying agent, is sheared, temperature is 210 DEG C, and speed is
1800 revs/min, time 4h obtains the first mixture；
(2), 0.15 part of sulphur is added in the first mixture and 0.15 part of inorganic phosphate mixes and stirs, temperature is 180 DEG C, the time
For 2h, the second mixture is obtained；
(3), after the modified solvent swell development of type SBS, it is different pungent that 1 part of phthalic acid two is added in the second mixture
Ester obtains modified pitch after stirring 2h.
Wherein, pitch is No. 70 asphalt, and saturation divides content to be 8%, and fragrance divides content to be 42%, and softening point is
46.3 DEG C, 25 DEG C of needle penetration is 68.
The molecular weight of type SBS modifying agent is 60,000, and polystyrene and polybutadiene block ratio are 3:7, cis- polybutadiene
The ratio of alkene, trans polybutadiene and end polybutadiene is 14:77:9.
In fact, the parts by weight of type SBS modifying agent, within 3.5-6.5 parts, the parts by weight of stabilizer are in 0.15-0.3
Within part, the parts by weight of auxiliary stabilizer are within 0.1-0.15 parts, and the parts by weight of diisooctyl phthalate are in 1-2 part
It inside can be with.
The block ratio of polystyrene and polybutadiene is possible within 3:7-4:6 in type SBS modifying agent.
In step (1), the temperature of shearing within 200-220 DEG C, the speed of shearing 1500-1800 revs/min it
Interior, the time of shearing can be within 3-5h.
In step (2), within 180-220 DEG C, the time mixed and stirred is possible the temperature mixed and stirred within 1-2h.
In step (3), the time of stirring is also possible within 1-2h.
Comparative example:
The preparation method of the modified asphalt of this comparative example comprising following steps:
(1), 100 parts of No. 70 asphalt are mixed with 4 parts of type SBS modifying agent, is sheared, temperature is 210 DEG C, and speed is
1800 revs/min, time 4h obtains the first mixture；
(2), 0.15 part of sulphur is added in the first mixture and 0.15 part of inorganic phosphate mixes and stirs, temperature is 180 DEG C, the time
For 2h, modified asphalt is obtained.
Wherein, the ratio of cis polybutadiene, trans polybutadiene and end polybutadiene is in type SBS modifying agent
35:42:33。
According to " People's Republic of China's professional standard (JTG 40-2004): highway engineering pitch and Asphalt Mixture Experiment
Regulation " standard, modified pitch and modified asphalt are tested for the property, test result is as shown in table 1:
Table 1: the viscosity of modified pitch and modified asphalt, needle penetration, the test result of softening point and ductility
| Project | Technical indicator | Modified pitch | Modified asphalt |
| Rotary viscosity (135 DEG C)/PaS | <3 | 2.31 | 2.25 |
| Needle penetration (25 DEG C)/0.1mm | 30‐60 | 54.00 | 53.00 |
| Softening point/DEG C | >60 | 74.90 | 72.20 |
| Ductility (5 DEG C) | >20 | 38.00 | 42.00 |
As can be seen from Table 1, the rotary viscosity of modified pitch and modified asphalt, needle penetration, soft before senile experiment
It is close with ductility to change point, and can meet the requirement of technical indicator.
<experiment>
The modified asphalt that the modified pitch and comparative example obtained using embodiment obtains carries out following real respectively as product
It tests.
<experiment 1>
The purpose of this experiment is to study ultraviolet ageing performance to chemical constituent in modified pitch and modified asphalt
It influences.
In order to which simulated roadway is in long-term use by the ultraviolet ageing environment caused by direct sunlight, researcher will be obtained
Modified pitch and modified asphalt placed 5 days in 60 DEG C of ultraviolet ageing case.Since the content of carbonyl in substance can be with
For characterizing the degree of oxidation of material, i.e., contained carbonyl is more, and carbonyl index is higher, shows that absorbed oxygen is more, in turn
The deterioration by oxidation phenomenon of generation is also more serious.Therefore, after experiment, researcher is using Fourier infrared spectrograph to modification
Carbonyl content in pitch and modified asphalt is tested.Test result is as shown in table 2:
Table 2: the test result of carbonyl in modified pitch and modified asphalt
As can be seen from Table 2, for the amount of oxygen absorbed in ageing process, modified pitch far fewer than modified asphalt,
That is influence of the ultraviolet ageing performance for chemical constituent in modified pitch is significantly less than to chemical constituent in modified asphalt
Influence degree, therefore, the ageing-resistant performance of modified pitch prepared by the present invention are good.
In short, the result of study of this experiment confirms under ultraviolet ageing environment, the carbonyl index increment rate of modified pitch
(385.71%) it is much smaller than the carbonyl index increment rate (1100.00%) of modified asphalt, thus illustrates preparation of the present invention
Modified pitch have excellent ageing-resistant performance.
<experiment 2>
The purpose of this experiment is to study influence of the thermo oxidative aging performance to modified pitch and modified asphalt.
Modified pitch and modified asphalt are placed in pressure ageing oven (PAV) and carry out aging reality by researcher
It tests, the time is 20 hours, and temperature is 100 DEG C, pressure 2.1MPa.After experiment, according to " highway engineering pitch and pitch
Test mixture regulation " method detection modified pitch and modified asphalt in (JTG E20-2011) 135 DEG C of viscosity, soft
Change point and needle penetration.Test result is as shown in table 3:
Table 3: the test result of the viscosity of modified pitch and modified asphalt, softening point and needle penetration
As can be seen from Table 3, after thermal oxidation, the viscosity build rate (19.91%) of modified pitch, which is less than, commonly to be changed
Property pitch viscosity build rate (28.44%), the softening point growth rate (4.80%) of modified pitch is less than modified asphalt
Softening point growth rate (17.45%), the needle penetration growth rate (14.81%) of modified pitch are less than the needle penetration of modified asphalt
Growth rate (26.42%), the i.e. viscosity, needle penetration of modified pitch and the increasing degree of softening point are significantly less than modified asphalt
Viscosity, the increasing degree of needle penetration and softening point, therefore, the thermo oxidative aging performance of modified pitch prepared by the present invention is good.
In short, the result of study of this experiment demonstrates under thermal oxidation, modified pitch prepared by the present invention is compared to general
Logical modified pitch has excellent thermo oxidative aging performance.
<experiment 3>
The purpose of this experiment is to study anti-rut behavior and anti-fatigue performance to modified pitch and modified asphalt
It influences.
Loose pitch is made after mixing and stirring modified pitch and modified asphalt with basalt aggregate respectively in researcher
Mixture, mixing and stirring temperature is 160 DEG C；Wherein, pitch addition content is 4.5%, is limited in the AC13 gradation of aggregate grading code requirement.
After experiment, researcher will add the mixing of the mixture and addition modified asphalt of modified pitch immediately
Material, which is placed in constant temperature (85 DEG C) baking oven, divulges information aging 5 days.It is anti-after aging can be evaluated due to wheel tracking test dynamic stability number
Track performance.Therefore, after senile experiment, researcher will add the mixture and addition modified asphalt of modified pitch
Mixture make molding track plate test specimen respectively and carry out wheel tracking test, forming temperature is 145 DEG C；The molding of asphalt
Method and wheel tracking test method are according to Chinese transportation ministerial standard " highway engineering pitch and Asphalt Mixture Experiment regulation "
(JTJ052-2000) regulation carries out.Anti-rut behavior test result is as shown in table 4.
Simultaneously as fatigue life can evaluate the anti-fatigue performance after aging.Therefore, addition is modified drip by researcher
The mixture that long 380mm, width 63mm and high 50mm is respectively prepared in the mixture of green mixture and addition modified asphalt is small
Beam, to carry out four-point bending fatigue life test.Researcher uses referring to U.S. AASHTO T321-03 Experimental Procedures
The four-point bending fatigue tester of IPCGloble company adjusts 1500 microstrains, and the bending that strain controlling is carried out at 15 DEG C is tired
Labor test, drops to the judgment criteria of 50% as fatigue life of initial stiffness using test specimen stiffness.Anti-fatigue performance test knot
Fruit is as shown in table 4.
Table 4: add modified pitch mixture and add modified asphalt mixture anti-rut behavior with resist it is tired
The test result of labor performance:
For anti-rut behavior, thermo-oxidative ageing makes asphalt hardening, and viscosity increases, and may improve anti-vehicle to a certain extent
Rut performance.And fatigue life is being degraded by modifying agent, after the changed influence of pitch chemical constituent, it may occur that apparent drop
It is low.
As can be seen from Table 4, the increment rate (11.06%) for adding the dynamic stability of modified asphalt mixture is general less than adding
The increment rate (20.35%) of the dynamic stability of logical modified asphalt mixture, under the fatigue life for adding modified asphalt mixture
Drop rate (40.07%) is less than the rate of descent (72.06%) of the fatigue life of addition modified asphalt mixture, therefore, addition
It is mixed that the dynamic stability growth degree of modified asphalt mixture and fatigue life reduction degree are significantly lower than addition modified asphalt
The dynamic stability growth degree and fatigue life for closing material reduce degree, i.e., long-term ageing is for adding transconfiguration advantage type SBS
The influence of the modified pitch of modifying agent is significantly less than modified asphalt.Therefore, the Rut resistance of modified pitch prepared by the present invention
Performance and anti-fatigue performance are good.
In short, the result of study of this experiment sufficiently demonstrates modified pitch prepared by the present invention compared to modified asphalt
Say that there is excellent anti-rut behavior and anti-fatigue performance.
The above-mentioned description to embodiment is that this hair can be understood and used for the ease of those skilled in the art
It is bright.Those skilled in the art obviously readily can make various modifications to these embodiments, and described herein one
As principle be applied in other embodiments, without having to go through creative labor.Therefore, the present invention is not limited to the above embodiments.
Those skilled in the art's principle according to the present invention, not departing from improvement that scope of the invention is made and modification all should be at this
Within the protection scope of invention.
Claims (9)
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| CN107421844B (en) * | 2017-08-23 | 2021-01-05 | 南京林业大学 | Short-term aging simulation method for components of asphalt based on thermal analysis-infrared combination |
| CN109735125A (en) * | 2019-01-14 | 2019-05-10 | 广西交通职业技术学院 | A kind of novel high-strength anti-rutting modified asphalt and preparation method thereof |
| CN113667313A (en) * | 2021-08-17 | 2021-11-19 | 浙江交通资源投资有限公司沥青科技分公司 | Special molecular dense maintenance asphalt and preparation method thereof |
| CN116715970B (en) * | 2023-06-29 | 2024-11-29 | 西南交通大学 | Low modulus and high elasticity modified asphalt suitable for high altitude areas and preparation method thereof |
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| CN102993757A (en) * | 2012-12-01 | 2013-03-27 | 江苏宝利沥青股份有限公司 | Preparation method of stable composite modified asphalt |
| CN104194361A (en) * | 2014-08-29 | 2014-12-10 | 成都工业学院 | SBS modified asphalt and preparation method thereof |
| CN104710804A (en) * | 2015-03-17 | 2015-06-17 | 中国海洋石油总公司 | SBS (styrene butadiene styrene) modified asphalt and preparation method thereof |
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| CN102993757A (en) * | 2012-12-01 | 2013-03-27 | 江苏宝利沥青股份有限公司 | Preparation method of stable composite modified asphalt |
| CN104194361A (en) * | 2014-08-29 | 2014-12-10 | 成都工业学院 | SBS modified asphalt and preparation method thereof |
| CN104710804A (en) * | 2015-03-17 | 2015-06-17 | 中国海洋石油总公司 | SBS (styrene butadiene styrene) modified asphalt and preparation method thereof |
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