CN103102498A - Production method for butadiene styrene rubber modified asphalt - Google Patents
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Abstract
The invention discloses a production method for butadiene styrene rubber modified asphalt. The production method comprises the following steps: (1) chopping butadiene styrene rubber, then mixing the chopped butadiene styrene rubber with a solvent and carrying out dissolving and dispersing so as to obtain butadiene styrene rubber mother liquor; (2) subjecting the butadiene styrene rubber mother liquor obtained in step (1) and a matrix asphalt raw material to primary blending, wherein the matrix asphalt raw material in the step is 5 to 60% of the mass of the total matrix asphalt raw material; and (3) subjecting a product of primary blending obtained in step (2) and residual matrix asphalt to secondary blending so as to obtain final butadiene styrene rubber modified asphalt. Compared with a conventional method, the production method provided by the invention overcomes the problem in large scale industrial production of block butadiene styrene rubber modified asphalt packed in bags, enables the butadiene styrene rubber modified asphalt with thermal storage stability to be produced normally without addition of a stabilizing agent and has the advantages of a small installation scale and low energy consumption in production.
Description
Technical field
The present invention relates to a kind of production method of polymer modified asphalt, particularly relate to a kind of production method of universal styrene butadiene rubber modified asphalt, be particularly suitable for producing the road styrene butadiene rubber modified asphalt.
Background technology
Styrene-butadiene rubber(SBR) (SBR) is the excellent polymkeric substance that improves the pitch low-temperature performance, is acknowledged as the most effective macromolecular material that improves the pitch low-temperature ductility, generally adds a small amount of SBR just can increase substantially the low-temperature ductility of pitch in pitch.For example, Gagle etc. (US4130506,1978) add 1% SBR to make more than its ductility brings up to 150cm in the pitch that 4 ℃ of ductilities are 7cm, and 1% SBS only brings up to 15cm.(US6136899,2000) such as Schulz etc. (US5002987,1991) and Lewandowski with a small amount of low temperature polymerization SBR latex, makes more than 4 ℃ of ductilities of pitch bring up to 150cm.These are all the less slight modified bitumen product of styrene-butadiene rubber(SBR) add-on, and its purpose is mainly to improve ductility, the especially low-temperature ductility of pitch.
Although SBR has unique effect aspect the road bitumen low-temperature ductility improving, no matter latex or the universal SBR of bulk is difficult to add in pitch namely is difficult to produce the SBR modifying asphalt.
At present, polymer modified asphalt adopts " wet method " more.So-called " wet method " refers to that granulated polymer directly joins in heated bitumen, jointly by colloidal mill or shears, obtains the polymer modified asphalt product, and wherein most typical is the SBS modifying asphalt.The main deficiency of this method is that the stable dispersion degree in matrix pitch of (1) properties-correcting agent is formed by residual oil to be affected, and relatively is suitable for the matrix pitch modification that high fragrance divides, hangs down asphalt content.(2) when grinding or shearing a small amount of properties-correcting agent (general 3%-5%), all matrix pitches also in company with properties-correcting agent together by shear at high temperature for several times.Like this, not only reduce dispersing apparatus treatment capacity, increase its energy consumption, the quality that also can make matrix pitch descends because of high temperature grinding repeatedly.
On the other hand; styrene-butadiene rubber(SBR) is obviously different from the shape of product of particulate state SBS; universal commodity styrene-butadiene rubber(SBR) is packed block (the styrene-butadiene rubber(SBR) commodity packaging generally is about 35 kilograms/piece), can't directly add in pitch and to adopt dispersing apparatus to carry out grinding distribution.
Namely allow to obtain particulate state styrene-butadiene rubber(SBR), but because himself is very easy to adhesion each other, places under the self gravitation effect and will stick into one soon, also become and to use.Simultaneously, with respect to SBS, the toughness of styrene-butadiene rubber(SBR) and distortion, elongation ability on stress direction are all very strong.So, in shearing the process of disperseing, directly enter in its modifying asphalt by shearing device without pulverizing after some particle deformation.Subsequently, shearing stress and the tensile stress suffered due to deformed shaped particles disappear, and particle is very fast returns to again original shape, thereby affect even, the stable dispersion of styrene-butadiene rubber(SBR) in modifying asphalt.Therefore, this class styrene-butadiene rubber(SBR) is difficult to directly adopt above-mentioned " wet method " to produce modifying asphalt.
For this reason, a lot of people have carried out a lot of significant work to this, and wherein most study is " masterbatch (grain) method ".Wang Shifeng etc. (rubber industry, 2002, Vol. 49: 210-214; CN1523050A, 2004; ) adopt the equipment of Rubber processing, SBR and high amount of inorganic filler, the mixing rear screw extrusion press granulation of using of a certain amount of pitch, then directly add in heated bitumen and stir; (CN1793235A, 2006 such as Liu Xin; CN1837292A, 2006) by Process Technology of Polymer equipment, styrene-butadiene rubber(SBR), silicate inorganic stablizer etc. are wrapped roller, then pulverize or granulation, adopt high shear mixing in pitch this master batch at last; Xu Jianbo etc. (CN1300801,2001) are mixed rubber, pitch and stopping composition etc., and then granulation on twin screw extruder is added to this high density master batch in heated bitumen and stirs.The weak point of this method is: (1) in the high density masterbatch that this method is produced, the styrene-butadiene rubber(SBR) granularity is very large and disperse inequality in master batch, affects the performance of its modifying asphalt; (2) too high in the lower masterbatch viscosity of mixing temperature (generally at 140-160 ℃), if only adopt simple whipping device, the homogeneity of modified bitumen product and stability problem; (3) mineral filler and bitumen compatibility are very poor, easily emanate out during thermmal storage.In addition, mineral filler or stablizer also affect the solubleness of modifying asphalt.
Early stage styrene butadiene rubber modified asphalt adopts solvent method production, is mainly used in water-proof material.In the 1980's, Chongqing Highway Science Inst. Ministry of Communications has just carried out the research of rubber modified asphalt, and has proposed the method that a whole set of solvent method is produced styrene butadiene rubber modified asphalt.So-called solvent method is to use monoblock or through the bulk styrene-butadiene rubber(SBR) of cutting to be immersed in low boiling point solvent, sometimes also stirs, and it is dissolved in solvent, then mixes with pitch and steams solvent.Consider that the problem that solvent brings is as poisonous in solvent and volatile, solvent consumption and safe retrieving, environmental pollution and fire hazard etc., this method is eliminated.Afterwards, there was the people that solvent used is improved.For example, Liu Shuchang etc. (CN1053438A, 1991) adopt high fragrant dissolution with solvents bulk styrene-butadiene rubber(SBR), then add polyolefine and sulphur, are mixed with modifying asphalt for roofing with pitch; He Zonghua etc. (CN1105371A, 1995) are pulverized by styrene-butadiene rubber(SBR) and water is cooked separant, put in high fragrant solvent and dissolve, and this mother liquor is used for water-proof material as styrene-butadiene rubber(SBR) properties-correcting agent.The weak point of aforesaid method is, (1) dissolution rate of block styrene-butadiene rubber(SBR) in solvent oil is very slow, experiment shows, granularity 1cm left and right 10%(weight) styrene-butadiene rubber(SBR) in above-mentioned 140 ℃ of solvents fully dissolving need time a couple of days, can not satisfy the needs of scale operation; (2) solvent temperature of above-mentioned patent up to 220 ℃, not only wastes energy, and more seriously, so high temperature will cause the degraded of styrene-butadiene rubber(SBR), and then have a strong impact on the effect of its modifying asphalt.
Summary of the invention
For overcoming weak point of the prior art, the object of the present invention is to provide a kind of suitable styrene butadiene rubber modified asphalt method; The inventive method has advantages of " wet method " and " solvent method " simultaneously, and overcomes their deficiency and shortcoming, can carry out the suitability for industrialized production styrene butadiene rubber modified asphalt.
The production method of styrene butadiene rubber modified asphalt of the present invention comprises following process:
(1) with the styrene-butadiene rubber(SBR) chopping, then with solvent, and dissolve dispersion, obtain the styrene-butadiene rubber(SBR) mother liquor;
(2) the styrene-butadiene rubber(SBR) mother liquor that obtains of step (1) and matrix pitch raw material carry out just subharmonic, and this step mesostroma asphalt stock is 5% ~ 60% of total matrix pitch raw materials quality, and preferred 10% ~ 40%;
(3) the first subharmonic product that obtains of step (2) carries out two subharmonics with the residue matrix pitch, obtains final styrene butadiene rubber modified asphalt.
In the inventive method, the chopping of step (1) styrene-butadiene rubber(SBR) is to the particle of 2 ~ 20mm.Solvent is high aromaticity content, high boiling petroleum fractions, and general requirement aromatic hydrocarbons mass content is more than 30%, is generally 30%～90%, and boiling point is generally 300～650 ℃ more than 300 ℃.Concrete as lubex, comprise that vacuum 1st side cut extracts oil, second line of distillation out and extract oil out, subtract three lines and extract oil out, subtract that four lines are extracted oil out and residue is extracted oil and composition thereof out, it is main also comprising extracting out oil, with the mixture of other organic solvent or oil product such as vacuum gas oil (VGO), catalytically cracked oil, coal tar.The present invention preferably subtracts three lines, subtracts four lines extraction oil and composition thereof.
In the inventive method, the mixing temperature in step (1) is 135 ~ 180 ℃, preferred 140 ~ 160 ℃, adopt circulation shear equipment, and as shears or colloidal mill, styrene-butadiene rubber(SBR) is fully dissolved and be dispersed in solvent, generally carry out circulation shear 3 ~ 10 times.In the styrene-butadiene rubber(SBR) mother liquor, the mass content of styrene-butadiene rubber(SBR) is generally 5% ~ 30%, and preferred 10% ~ 20%.
In the inventive method, whipping device or shearing device are adopted in the described just subharmonic of step (2), and the temperature that is in harmonious proportion is 135 ~ 180 ℃, preferred 140 ~ 160 ℃.
In the inventive method, static mixer, mixing tank or its combination are adopted in described two subharmonics of step (3), and the temperature of two subharmonics is 130 ~ 170 ℃, preferred 140 ~ 160 ℃.
In the inventive method, the mass content of styrene-butadiene rubber(SBR) in modifying asphalt is general 0.2% ~ 7%, can according to requirements specifically determine.
In road bitumen, the consumption of polymkeric substance is smaller in polymer modification, and generally below 5%, sometimes even below 3%, the consumption of additive is generally below 1%, some additive amount still less, as the consumption of stablizer sometimes in 1 ‰ left and right.The less material of these consumptions is difficult to be uniformly dispersed in matrix pitch.Technique of the present invention is repeatedly mixed, disperses and dilute by different units, solves the few material of add-on and is difficult to even distribution problem, has guaranteed the dispersing uniformity of different material in residual oil, and then guaranteed the quality of modified bitumen product on technique.
The present invention adopts " wet method " polymer modified asphalt production technique and equipment, use high aromaticity content, high boiling petroleum fractions to make the solvent of styrene-butadiene rubber(SBR), and in this solvent, styrene-butadiene rubber(SBR) is carried out Forced Dispersion and dissolving by high-shear, lapping mode, it is formed under short period of time, lesser temps be easy to the defeated styrene-butadiene rubber(SBR) mother liquor of pump, and then this mother liquor is mixed step by step with matrix pitch, be conducive to improve the dispersion effect of styrene-butadiene rubber(SBR), obtain the better styrene butadiene rubber modified asphalt of performance.
The present invention is in preparation styrene-butadiene rubber(SBR) mother liquor process, both overcome the matrix pitch drawback that multiple high temp is sheared together with properties-correcting agent of " wet method " polymer modified asphalt, more introduced the useful high aromatic component of raising asphalt performance, and do not had the problem of solvent contamination and recovery.Simultaneously, because styrene-butadiene rubber(SBR) is dissolved by high aromatic component at the mother liquor preparatory phase, therefore styrene butadiene rubber modified asphalt technique of the present invention has solved the problem of the modification difficulty of high bituminous matter, low fragrance minute matrix pitch.Technique of the present invention has been avoided the degradation problem of styrene-butadiene rubber(SBR) under high temperature, long-time condition.
The present invention selects high boiling point, high aromaticity content petroleum fractions to dissolve fast styrene-butadiene rubber(SBR) under shear conditions, substep mixes with matrix pitch again, both solved styrene-butadiene rubber(SBR) in matrix pitch evenly and the problem of rapid dispersion, reduce again the processing load of shears, reduced facility investment and production cost.Simultaneously can obtain stable styrene butadiene rubber modified asphalt product.
Embodiment
Styrene butadiene rubber modified asphalt production method of the present invention is comprised of four units in series, is respectively styrene-butadiene rubber(SBR) by the charging order and pulverizes unit, styrene-butadiene rubber(SBR) mother liquor and prepare subharmonic unit at the beginning of unit, styrene-butadiene rubber(SBR) mother liquor and matrix pitch, two subharmonic unit.
Pulverizing unit generally is comprised of bale splitter and pulverizer.Bale splitter cuts into the styrene-butadiene rubber(SBR) of bulk and is fit to the stripe shape piece that pulverizer is pulverized, and generally the styrene-butadiene rubber(SBR) transverse cutting of bulk is become 2 ~ 5, then by travelling belt or manual mode, it is put in pulverizer, is ground into the particle of certain particle size.Particle is by the general 2 ~ 20mm in aperture of sieve board of grinder, preferred 8 ~ 12mm.
The styrene-butadiene rubber(SBR) mother liquor prepares the unit and is comprised of mother liquor tank, agitator, shearing device and pump.Install in advance high aromaticity content petroleum fractions in tank, and start agitator.Come from the styrene-butadiene rubber(SBR) particle of pulverizer without stacking (avoiding adhesion to carry together), directly by wind give, travelling belt or artificial mode of throwing in join in mother liquor tank, mix with high aromaticity content petroleum fractions by agitator, start simultaneously circulation shear equipment, preparation styrene-butadiene rubber(SBR) mother liquor.Shearing device can be colloidal mill, can be also shears, preferred shears.If produce continuously styrene butadiene rubber modified asphalt, can several mother liquor tanks in parallel.
The circulation shear temperature of styrene-butadiene rubber(SBR) particle in mother liquor tank is 30 ~ 180 ℃, preferred 145 ~ 165 ℃.The circulation shear time depends primarily on the ratio of mother liquor tank charge amount and shears effective unit time treatment capacity, i.e. the time of the average circulation 1 time of mother liquor, the average circulation shear gets final product more than 3 times, is to save the energy, improve treatment capacity, preferred 3 ~ 10 times.In the styrene-butadiene rubber(SBR) mother liquor, the mass content of styrene-butadiene rubber(SBR) is generally 5% ~ 30%, and preferred 10% ~ 20%.
Just subharmonic unit is blend tank.One road material by being pumped into blend tank, also can adopt pump to connect with shearing device (as colloidal mill or shears) from the styrene-butadiene rubber(SBR) mother liquor of mother liquor tank, and preferred shears is sent into blend tank.Another road material is matrix pitch.On blend tank, also can add other additive commonly used, as stablizer, antiaging agent etc., to improve performance of modified bitumen.If produce continuously styrene butadiene rubber modified asphalt, can several blend tanks in parallel.
The temperature of introducing the blend tank matrix pitch is 130 ~ 170 ℃, preferred 140 ~ 160 ℃; The temperature of mother liquor is 135 ~ 180 ℃, preferred 140 ~ 160 ℃.The matrix pitch that just subharmonic is used accounts for 5% ~ 60% of matrix pitch total amount, and preferred 10% ~ 40%(by weight).
Two subharmonic unit are static mixer, mixing tank or its combination.Be consecutive production and the saving energy of technique of the present invention, preferred static mixer.First mixed material from just mixed tank mixes with residue matrix pitch/residual oil secondary, produces styrene butadiene rubber modified asphalt.
The matrix pitch temperature that enters two subharmonic unit is 130 ~ 170 ℃, preferred 140 ~ 160 ℃.In the styrene butadiene rubber modified asphalt of mediation unit production, the content of styrene-butadiene rubber(SBR) is by the ratio control of mother liquor and matrix pitch.Concrete content also depends on styrene-butadiene rubber(SBR) modification purpose.If only improve the ductility of road bitumen, as previously mentioned, slight modification gets final product, and is general 0.2% ~ 1.5%, preferred 0.5% ~ 1.0%(weight); If produce normal styrene butadiene rubber modified asphalt, general 2% ~ 7%, preferred 3% ~ 5%(weight).
Styrene-butadiene rubber(SBR) of the present invention is the universal styrene-butadiene rubber(SBR) of solid, comprises emulsion polymerized styrene butadiene rubber (ESBR) and solution polymerized butadiene styrene rubber (SSBR), preferred emulsion polymerized styrene butadiene rubber.The emulsion polymerized styrene butadiene rubber commodity comprise coventional type 1500 series, fill carbon black type 1600 series, oil-filled type Series 1700, oil-filled carbon black type 1800 series of filling, preferred coventional type 1500 series.The solution polymerized butadiene styrene rubber commodity comprise non-oil-filled T2003, oil-filled T1534, oil-filled T2530.
In the present invention, matrix pitch used is road bitumen, can be ordinary road pitch, A level road bitumen, B level road bitumen, C level road bitumen and heavy-duty road asphalt etc., also can the suitable residual oil of character of use.The penetration degree of matrix pitch depends on the trade mark of prepared sample and extracts the consumption of oil out.
Further illustrate the present invention program and effect below in conjunction with embodiment.The percentage ratio of giving in the present invention is massfraction.
Embodiment of the present invention matrix pitch used is the Tahe residual oil that Sinopec Xi'an petrochemical industry branch office produces, normal heptane asphalt content 17%.Solvent is subtracting three lines and subtracting four lines extraction oil of Sinopec Jinan branch office's production.Styrene-butadiene rubber(SBR) is 1500,35 kilograms/bag of the emulsion polymerized styrene butadiene rubbers (ESBR) produced of Jilin branch office of PetroChina Company Limited..
The embodiment of the present invention adopts bale splitter that the styrene-butadiene rubber(SBR) transverse cutting is become 3, drops in the high speed Universalpulverizer (model SWP560) that Qingdao molding machine company limited produces, and the hole diameter of sieve (perforated) plate is 10mm.
Embodiment the results are shown in Table 1.
Embodiment 1
The three lines extraction oil pumps that subtract of 90 ℃ are entered the mother liquor filling, start agitator and also add the styrene-butadiene rubber(SBR) particle, extract oil and styrene-butadiene rubber(SBR) particle add-on out and be respectively 82% and 18%.Then, start shears (FLUKO company produce, model is FDX3/100), carry out circulation shear.In the circulation shear process, control the Heating temperature of mother liquor, make it remain on 160 ℃ of left and right.Every circulation shear once dips mother liquor one time with glass stick, observes the dissolving situation of styrene-butadiene rubber(SBR) in mother liquor.
Until range estimation during less than particle, mother liquor is squeezed into blend tank in stirring, carry out just subharmonic with wherein 160 ℃ of matrix pitches that account for total matrix pitch consumption 20%, time harmonic is identical with the circulation shear time once.Then, jointly pump into static mixer with other 80% matrix pitch, carry out two subharmonics, produce styrene butadiene rubber modified asphalt.In this modifying asphalt, mother liquor account for 22.22%(wherein styrene-butadiene rubber(SBR) account for 4%, extract oil out and account for 18.22%), matrix pitch account for 77.78%(wherein just subharmonic 15.56%, two subharmonics that account for modifying asphalt account for modifying asphalt 62.22%).
Embodiment 2
Specific implementation method is with embodiment 1.Extracting oil out is 110 ℃ for subtracting four lines and temperature, extracts consumption 88%, the styrene-butadiene rubber(SBR) consumption 12% of oil in mother liquor out, 140 ℃ of mother liquor shear temperature, and the matrix pitch that advances just subharmonic accounts for 35% of total matrix pitch, advances static mixer and accounts for 65%.In this modifying asphalt, mother liquor account for 6.67%(wherein styrene-butadiene rubber(SBR) account for 0.8%, extract oil out and account for 5.87%), matrix pitch account for 93.33%(wherein just subharmonic account for 32.67%, two subharmonics and account for 60.66%).
Comparative example 1
99.2% matrix pitch in embodiment 1 is heated to 150 ℃, adds 0.8% styrene-butadiene rubber(SBR) particles circulating to shear, press the method for embodiment 1 and observe the deployment conditions of styrene-butadiene rubber(SBR) in residual oil.
Comparative example 2
Method is with comparative example 1.Material consists of matrix pitch 75%, extracts oil 24% out, styrene-butadiene rubber(SBR) is 1%.
Comparative example 3
Embodiment of the method 1 just adds all matrix pitches when just subharmonic.Then, the material after being in harmonious proportion is divided into two bursts of logistics (being respectively 25% and 75%), jointly passes through static mixer.
The dispersiveness of table 1 styrene butadiene rubber modified asphalt and stable.
| Scheme | Granular size/mm for the first time | Granular size/mm for the second time | Granular size/mm for the third time | The 4th granular size/mm | 160 ℃ of static storages of the finished product 1 day |
| Embodiment 1 | 1.5～1.0 | 0.5～1 | Without particle | Without particle | Without particle, without layering |
| Embodiment 2 | 1.5～1.0 | 0.8～0.3 | Without particle | Without particle | Without particle, without layering |
| Comparative example 1 | 2～3 | 2～3 | 2～3 | 1.5～2.5 | Layering |
| Comparative example 2 | 2～3 | 1.5～2 | 1～1.5 | 1～1.5 | Layering |
| Comparative example 3 | 1.5～1.0 | 0.5～1 | Without particle | Without particle | Layering |
As can be seen from Table 1, the inventive method can obtain stable styrene butadiene rubber modified asphalt product.
Claims (10)
1. the production method of a styrene butadiene rubber modified asphalt is characterized in that comprising following process:
(1) with the styrene-butadiene rubber(SBR) chopping, then with solvent, and dissolve dispersion, obtain the styrene-butadiene rubber(SBR) mother liquor;
(2) the styrene-butadiene rubber(SBR) mother liquor that obtains of step (1) and matrix pitch raw material carry out just subharmonic, and this step mesostroma asphalt stock is 5% ~ 60% of total matrix pitch raw materials quality;
(3) the first subharmonic product that obtains of step (2) carries out two subharmonics with the residue matrix pitch, obtains final styrene butadiene rubber modified asphalt.
2. in accordance with the method for claim 1, it is characterized in that: in step (1), the styrene-butadiene rubber(SBR) chopping is to the particle of 2 ~ 20mm.
3. in accordance with the method for claim 1, it is characterized in that: in step (1), solvent is high aromaticity content, high boiling petroleum fractions, and the aromatic hydrocarbons mass content is 30%, and boiling point is more than 300 ℃.
4. according to the described method of claim 1 or 3, it is characterized in that: in step (1), the aromatic hydrocarbons mass content of solvent is 30%～90%, and boiling point is 300～650 ℃.
5. according to the described method of claim 1 or 3, it is characterized in that: in step (1), solvent is lubex, perhaps the mixture of lubex and vacuum gas oil, catalytically cracked oil, coal tar.
6. in accordance with the method for claim 1, it is characterized in that: in step (1), mixing temperature is 135 ~ 180 ℃, adopts circulation shear equipment, styrene-butadiene rubber(SBR) is fully dissolved be dispersed in solvent, and circulation shear carries out 3 ~ 10 times.
7. in accordance with the method for claim 1, it is characterized in that: in step (1) styrene-butadiene rubber(SBR) mother liquor, the mass content of styrene-butadiene rubber(SBR) is 5% ~ 30%, and the mass content of styrene-butadiene rubber(SBR) in modifying asphalt is 0.2% ~ 7%.
8. in accordance with the method for claim 1, it is characterized in that: in step (2), whipping device or shearing device are adopted in first subharmonic, and the temperature that is in harmonious proportion is 135 ~ 180 ℃.
9. in accordance with the method for claim 1, it is characterized in that: in step (2), first subharmonic matrix pitch raw material used is 10% ~ 40% of total matrix pitch raw materials quality.
10. in accordance with the method for claim 1, it is characterized in that: in step (3), static mixer, mixing tank or its combination are adopted in two subharmonics, and the temperature of two subharmonics is 130 ~ 170 ℃.
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Cited By (6)
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| CN104448850A (en) * | 2014-11-23 | 2015-03-25 | 黎裕发 | Preparation method of novel modified asphalt |
| CN105062535A (en) * | 2015-08-31 | 2015-11-18 | 句容宁武科技开发有限公司 | Method for continuously producing modified asphalt |
| CN107715777A (en) * | 2017-08-21 | 2018-02-23 | 宁波中金石化有限公司 | A kind of manufacturing equipment and preparation method of multifunctional modification aromatic hydrocarbons |
| CN108912704A (en) * | 2018-06-01 | 2018-11-30 | 深圳海川新材料科技股份有限公司 | A kind of reconciliation process for preparing asphalt |
| CN113969179A (en) * | 2021-10-26 | 2022-01-25 | 中国石油化工股份有限公司 | High-viscosity furfural refined extract oil and preparation method thereof |
| CN116063857A (en) * | 2021-10-29 | 2023-05-05 | 中国石油化工股份有限公司 | Polymer mother liquor and preparation method thereof, and No. 50A grade asphalt and preparation method thereof |
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| CN104448850A (en) * | 2014-11-23 | 2015-03-25 | 黎裕发 | Preparation method of novel modified asphalt |
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| CN108912704A (en) * | 2018-06-01 | 2018-11-30 | 深圳海川新材料科技股份有限公司 | A kind of reconciliation process for preparing asphalt |
| CN113969179A (en) * | 2021-10-26 | 2022-01-25 | 中国石油化工股份有限公司 | High-viscosity furfural refined extract oil and preparation method thereof |
| CN116063857A (en) * | 2021-10-29 | 2023-05-05 | 中国石油化工股份有限公司 | Polymer mother liquor and preparation method thereof, and No. 50A grade asphalt and preparation method thereof |
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