Prior art
Matrix pitch is a kind of pitch of preparing to produce with properties-correcting agent modifying asphalt, modifying asphalt is exactly the SBS modifying asphalt, and high aromatic oil is to extract out oily through the frivolous oil that subtracts four lines extraction oil, catalytic slurry extraction oil and propane deasphalting device that furfural extraction unit is handled.It is the requirement of modern road traffic to bituminous pavement that pitch is carried out modification, the highroad particularly characteristics of high-grade highway is that the volume of traffic is big, and weight-carrying capacity is big and the speed of a motor vehicle is fast, and this just proposes more and more higher requirement to pitch, general pitch is difficult to reach requirement, therefore just must carry out modification to pitch.Modifying asphalt is made up of properties-correcting agent and matrix pitch, and properties-correcting agent commonly used has SBS (styrene-butadiene-styrene thermoplastic elastomer), SBR (styrene-butadiene rubber(SBR)), PE (polyethylene) and other kind properties-correcting agent.Because SBS can improve the bituminous high temperature performance, when it joins in the pitch, can improve the pavement performance of road bitumen, and the use properties of energy road improvement pitch under high/low temperature condition, therefore SBS is rising a kind of properties-correcting agent, generally adopts SBS to produce modifying asphalt as properties-correcting agent at present both at home and abroad.
In recent years, very many to the research of SBS modifying asphalt both at home and abroad, but the patent of this respect is few, and especially Chinese patent is few.Domestic patent generally adopts solvent method to produce modifying asphalt, as what report among patent CN1048867 and the CN1069989 all is with solvent (toluene or dimethylbenzene) masterbatch to be made in the SBS dissolving earlier, allocate with a large amount of heated bitumens during on-the-spot the use, reclaim solvent again and produce modified asphalt material.Need use solvent when the shortcoming of this technology is the masterbatch manufacturing, reclaim in the product of back and still contain a small amount of solvent, and the solvent recuperation cost be higher, has increased production cost, simultaneously, these solvents are volatile, and HUMAN HEALTH and environment are worked the mischief.External research concentrates on, according to asphaltic nature, select suitable SBS to react the production modifying asphalt, just utilize SBS and bituminous sulfonation, neutral technology to develop the SBS modifying asphalt as US5393811, this technology causes the production process complexity owing to have sulfonation and N-process.
Summary of the invention
The present invention proposes with high aromatic oil as a kind of method for preparing modifying asphalt, it has improved the composition of matrix pitch, the intermiscibility of pitch and SBS is improved, production technique of the present invention is, a kind of pitch little with high aromatic oil and penetration degree reconciles into matrix pitch, add SBS again, adopt the shearing explained hereafter to go out modifying asphalt.The present invention reduces production cost owing to do not use solvent.
The object of the present invention is to provide modified asphalt preparation method, a kind of raw materials for production, as the component of blending matrix pitch, the matrix pitch of blending can directly use as heavy traffic paving asphalt.
Modified asphalt preparation method provided by the present invention, the compatibleness of increase pitch and SBS.It is dispersed in pitch mainly to solve SBS, forms stable mixed phase system, produces qualified SBS modified bitumen product.
The present invention is achieved in that
Furfural treatment with Kelamayi petro-chemical corporation (or manufacturer of other refining of petroleum) is the petroleum products furfural extract oil that process means obtains, as a kind of raw material of producing modifying asphalt.The raw material of furfural extract oil is the frivolous oil and the catalytic slurry of each section cut of comprising viscous crude decompression side line (subtract three-way, subtract four lines), propane deasphalting device, these extract the component that oil all can be used as the blending matrix pitch out, outward appearance is Vandyke brown, and character is different and different according to producing the feedstock property of extracting oil out.Specific nature is shown in Table 1.
Table 1 petro-chemical corporation furfural extract oil character
| Catalytic slurry is extracted oil out | Subtract four lines and extract oil out | The frivolous oil of propane deasphalting is extracted oil out |
20 ℃ of density, g/m
3 | ??1049 | ????992 | ????981 |
Open flash point, ℃ | ??252 | ????262 | ????242 |
100 ℃ of viscosity, mm
2/s
| ??53.25 | ????75.81 | ????83.34 |
Form % | Saturated part | ??12.88 | ????26.64 | ????28.44 |
Fragrance part | ??79.45 | ????54.24 | ????54.56 |
Colloid | ??7.57 | ????19.12 | ????17.00 |
Sulphur content, % | ??0.202 | ????0.236 | ????0.182 |
Nitrogen content, % | ??0.37 | ????0.53 | ????0.504 |
High aromatic oil can be concocted matrix pitch with propane deasphalting, oxidized bitumen respectively as the component of blending matrix pitch, produces the SBS modifying asphalt then.Concoct by following method.
Method with high aromatic oil and third diasphaltene blending matrix pitch.The high aromatic oil ratio is that 10~25%, the third diasphaltene ratio is 65~85%, and the vacuum residuum ratio is 5~10%.Under 100~160 ℃, through static mixer or stir 20~80min, can obtain producing the matrix pitch of modifying asphalt, it can satisfy the technical requirements of 110# or 90# heavy traffic paving asphalt.
Method with high aromatic oil and oxidized bitumen (oxidized bitumen is the pitch of 10# building asphalt or vacuum residuum direct oxidation) blending matrix pitch, the high aromatic oil ratio is 10~40%, 10# building asphalt ratio is 30~45%, and the vacuum residuum ratio is 30~45%.Under 100~160 ℃, through static mixer or stir 20~80min, can obtain matrix pitch, it can satisfy the technical requirements of 110# or 90# heavy traffic paving asphalt equally.
The method for preparing modifying asphalt with the matrix pitch of above-mentioned blending is, the matrix pitch ratio is 92~97%, and the ratio of SBS is 3~8%, at 170~240 ℃ of down cuts, velocity of shear is 2500~6000 rev/mins, and shear time is 20~150min, promptly obtains modified bitumen product.
The high aromatic oil that the present invention proposes is as the component of modifying asphalt, and the technology of blending matrix pitch is simple, can not produce the three wastes, environmentally safe, and simple with its method of producing modifying asphalt, the index of its low-temperature ductility and softening temperature is more superior than plain asphalt.
The effect of 6 inventions
Modifying asphalt component convenient sources of the present invention, refinery with furfural treatment treatment unit can the by-product high aromatic oil, respectively with third diasphaltene, half oxidized bitumen, 10# building asphalt and vacuum residuum blending matrix pitch, its mixing process is simple, adopt existing processes equipment just can finish mixing process, etching apparatus can not produce the three wastes, environmentally safe, and the matrix pitch of blending can be used as heavy traffic paving asphalt and directly uses.
From compositional analysis, good with the compatibleness of SBS, direct shear just can be produced modifying asphalt, must reclaim solvent when having overcome solvent method production modifying asphalt by the matrix pitch of high aromatic oil blending.Therefore invention has reduced production cost, and can not pollute environment owing to do not use solvent.Modifying asphalt according to the present invention's production, estimate by analysis, its low-temperature ductility (10 ℃) reaches 50cm, softening temperature reaches 60 ℃, be higher than 45 ℃ of general bituminous softening temperatures, 25 ℃ recovery of elasticity also reaches 80%, meets " polymer modified asphalt technical indicator " that the Ministry of Communications issues fully (JTJ036-1998).