CN104830076A - Method for preparing rubber waste cracking converted modified asphalt - Google Patents
Method for preparing rubber waste cracking converted modified asphalt Download PDFInfo
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- CN104830076A CN104830076A CN201510179870.4A CN201510179870A CN104830076A CN 104830076 A CN104830076 A CN 104830076A CN 201510179870 A CN201510179870 A CN 201510179870A CN 104830076 A CN104830076 A CN 104830076A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/62—Plastics recycling; Rubber recycling
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Abstract
The invention relates to a method for preparing rubber waste cracking converted modified asphalt. The method mainly comprises the following steps: allowing rubber waste powder to go through a normal pressure double helix device, carrying out high temperature processing at 260-360DEG C for 10-30min to realize cracking conversion of the rubber waste in order to form a viscous asphalt material, adding the viscous asphalt material to heavy duty asphalt, stirring to obtain a rubber waste cracking converted asphalt mother liquor, adding 1-6wt% of SBS, and carrying out shearing dispersion to obtain the high performance modified asphalt. An apparatus for preparing cracking converted rubber has the characteristics of low cost, high conversion efficiency, environmental protection and safety, and the modified asphalt obtained through cracking converted rubber and heavy duty asphalt mixing and SBS modification has the characteristics of stable heat storage, excellent high and low temperature performances and excellent ultraviolet resistance, and makes the rubber waste have good economic and environmentally-friendly benefits.
Description
Technical field
The present invention relates to modifying road asphalt field, especially relate to the preparation method that a kind of waste rubber cracking transforms modifying asphalt.
Background technology
Pitch, as a kind of agglutinate, has waterproof, insulation, the advantage such as corrosion-resistant, and has good cohesive action with stone ore material, be extensively used as pavement construction material for a long time.In recent years, along with the increase of the volume of traffic and traffic load, people propose harsher requirement to urban road laying bituminous material, but plain asphalt high temperature easily produces rut, and low temperature is easy to crack, easily aging, the life-span is short, can not meet actual needs completely.Usually being added by polymkeric substance is distributed in pitch, prepares polymer modified asphalt, effectively can improve the high temperature performance of pitch.
In the polymkeric substance that modifying asphalt is used, that the most frequently used is styrene-butadiene-styrene (SBS).But SBS price is higher, and due to the unsaturated easy generation of molecular backbone chain structure aging, be necessary to select the higher material of cost performance.In addition, China's junked tire amount increases year by year, the solid waste that annual generation is a large amount of.If waste-tyre rubber-powder is used for modifying asphalt, the process problem of solid waste can be solved; Can part SBS be replaced and there is economic benefit and environmental benefit.But shoddy is crosslinking structure at present, be difficult to be distributed in pitch, the hot storage stability of the SBS/ shoddy composite modified asphalt of preparation is not enough, in storage and transportation process, easily produce segregation demixing phenomenon, there is floating rubber powder and sink in SBS, affects the performance of modifying asphalt.
SBS/ rubber powder composite modified asphalt stable is a difficult problem in the industry always.Chinese patent CN103146206A is by improving stability by SBS and rubber powder by the method for Screw Extrusion, but the method tooling cost is higher, and practice shows, still having a large amount of rubber powder granule to exist in pitch can precipitate.
For improving the dispersiveness of rubber powder in pitch, CN102601975A mono-kind adopts the method for screw extrusion press continuous production liquid regeneration glue, this invention adopts the method for screw extrusion press continuous production liquid regeneration glue, the method utilizes screw extrusion press, adopt the method for physical chemistry interlock, by pretreated shoddy, in extruding built-in temperature, pressure, shear, under the comprehensive action of sweetening agent, the three-dimensional crosslinked network of broken waste rubber, obtain the reclaimed rubber of liquid, the liquid regeneration glue obtained can with pitch and with or replacing asphalt for paving the way, with pure glue and with making water-proof and anti-corrosive material etc.Though this method technical process is simple, have that desulphurization, disaggregation degree is high, energy-saving and environmental protection, continuous print advantage, but exist yield poorly, tooling cost is high, screw rod has pressure, easily makes the shortcoming that screw rod weares and teares.This liquid regeneration glue is added in pitch, also there is the shortcoming of high-temperature behavior deficiency.
Constant-pressure and high-temperature duplex desulfurization equipment is dangerous for overcoming conventional high-tension dynamic devulcanizer high pressure, the problems such as exhaust gas emission is unordered, difficult control and the environmental protection sweetener of with no pressure, non-exhaust emission that grows up, the feature such as have automatic control and output is large.But this device is generally for as described in CN200810238546.5, reclaimed rubber (sol content about 30%) is prepared in 200-280 DEG C of work range, replace rubber for the manufacture of rubber item to be used as part, if reason is processing rubber under higher temperature, rubber meeting colloidal sol amount higher (being greater than 60%) extruded, cause its mechanical strength lower, during goods straight for rubber, intensity is low, therefore this device one is used at 200-280 DEG C of work range processing rubber.Use it for cracking at higher temperature asphaltogenic for doing again of deep regenerative rubber, have not been reported.
CN103194072A, CN103980723A and CN102181163A etc. use the way of SBS and activated rubber powder or the rubber powder long-time composite modified asphalt sheared in pitch, and then prepare the composite modified asphalt of steady heat storage.This processes process single is longer, and cost is higher, and pollute large, and be subject to the restriction of mixing temperature, the addition of rubber powder is also restricted.
Summary of the invention
The present invention in order to overcome above-mentioned deficiency of the prior art, provide a kind of technological process succinctly easy, a large amount of waste rubber can be added ageing-resistant waste rubber cracking transform the preparation method of modifying asphalt.
People is for achieving the above object in invention, in conjunction with problem to be solved by this invention, through studying for a long period of time, find that waste rubber is higher than 260 DEG C, particularly about 300 DEG C easily there is the violent fracture of molecular chain, now easily obtain liquid rubber, this rubber is different from a large amount of reclaimed rubber used on market, its sol content high (being greater than 60%), but just because of this point, make its mechanical strength lower, low for rubber item intensity, so be not taken seriously.Because its viscosity is low and have cohesiveness, therefore there is the feature of class bituminous material.Again due to constant-pressure and high-temperature duplex desulfurization equipment discharge with endless screw function, be applicable to preparation class bituminous material, such bituminous material is not only easily distributed in pitch, and addition content in pitch is large, transform pitch, thus solve rubber powder difficult dispersion and settlement issues in pitch.Therefore contriver determines the Pintsch process performance of constant-pressure and high-temperature duplex desulfurization equipment and waste rubber to combine, and coordinates other rational method, reaches the technique effect that the present invention wants to reach simultaneously.
The technical solution used in the present invention is:
Waste rubber cracking transforms a preparation method for modifying asphalt, it is characterized in that, comprises following steps:
(1) waste rubber cracking conversion is obtained cracking and transform rubber;
(2) by weight ratio be 60/40 ~ 95/5 heavy traffic paving asphalt/cracking transform rubber when temperature is 150 ~ 180 DEG C, mix, obtain waste rubber and transform asphalt mother liquid;
(3) by mass ratio be above-mentioned waste rubber transform asphalt mother liquid 1 ~ 6% SBS join in the conversion asphalt mother liquid of 170 ~ 190 DEG C, utilize high shearing mixing emulsor or colloidal mill, temperature remains on 170 ~ 190 DEG C, shear dispersion, then stir on high speed dispersor and grow, and between this stirring growth period, drop into co-crosslinker, finally prepare high performance waste rubber cracking and transform modifying asphalt.
In described step (1), waste rubber cracking being transformed the detailed process obtaining cracking conversion rubber is: by waste Crumb rubber by normal pressure duplex cracker, 10-30min is processed at 260-360 DEG C of temperature, make waste rubber cracking be converted into thick class bituminous material, namely cracking transforms rubber;
As preferably, in step (3), be that described waste rubber transforms 0.1 ~ 1% of asphalt mother liquid total mass stirring the co-crosslinker quality dropped between the growth period.
As preferably, in step (3), between the stirring growth period, control mixing speed is 300 ~ 1000r/min, stirring reaction 60 ~ 150min.
As preferably, the waste rubber in described step (1) is the rubber powder ground after junked tire fragmentation, and order number is 15-60 order.
As preferably, described step (2) first cracking is transformed rubber to add in heating asphalt tank, reacts mix with pitch at 150 ~ 180 DEG C, prepares waste rubber and transform asphalt mother liquid.
As preferably, the heavy traffic paving asphalt described in described step (2) meets the Ministry of Communications JTGF40-2004 requirement.
As preferably, described SBS is line style styrene-butadiene-styrene, and wherein the mass ratio of vinylbenzene and divinyl is 3/7, and molecular weight is 60,000 ~ 300,000.
As preferably, the cracking obtained in described step (1) transforms rubbery collosol content and is greater than 60%, and mooney viscosity is lower than 40.
As preferably, in step (3), described in the linking agent that adds be sulphur.
The waste rubber cracking that the preparation method that present invention also offers a kind of above-mentioned waste rubber cracking conversion modifying asphalt obtains transforms modifying asphalt.
The present invention adopts the method for normal pressure duplex Pintsch process, and the fume emission that the course of processing produces is orderly, collects by cooling duct.Because degradation temperature is up to about 300 DEG C, the main chain of cross-linked rubber and crosslinking sidechain are easy to that chemical bond occurs and destroy, and the crosslinking structure of rubber is disintegrated, makes waste rubber be cracked into liquid type asphaltic substances, because cross-link bond ruptures in a large number, molecular weight rubber is less than 10,000 g/mol, and now sol content is sharply raised to, and is greater than 60%, there is high workability and adhesive property, become class sapropelitic, thus reduce the lamination tendency of waste rubber in matrix pitch, thus in pitch, reach uniform and stable dispersion.In the preparation process of modifying asphalt, add the SBS prepared, under the intensive shear of high shearing mixing emulsor and the effect of high temperature, the rubber of SBS and cracking is under linking agent effect, the interaction of further generation, improve the consistency between SBS/ waste rubber pitch, thus improve the hot storage stability of modifying asphalt, SBS also considerably improves the performance that waste rubber transforms pitch.
Compared with prior art, the SBS modification waste rubber cracking that the present invention obtains transforms pitch, and isolation test performs according to GB/T0661-2011 standard, and result shows that its hot storage stability is excellent.135 DEG C of viscosity perform according to GB/T0625-2011 standard, and result shows that it has good construction workability.The test of the penetration degree of modifying asphalt, ductility, softening temperature performs according to GB/T0604-2011, GB/T0605-2011, GB/T0606-2011 standard respectively, result shows that the high temperature performance of modifying asphalt is excellent, physical properties meets the bitumen for road use performance index that China specifies, be applicable to producing employing on a large scale, and achieve significant technique effect:
1. by the method for duplex Pintsch process, make waste rubber become class asphaltic substances, significantly improve its dispersiveness in pitch.
2. use SBS to be properties-correcting agent, sulphur is as linking agent.Like this, make the rubber of cracking that crosslinked combination occur, collaborative SBS further increases the performance of modifying asphalt.
3., because waste rubber cracking rubber powder disperses fine in pitch, have a large amount of carbon black release, therefore it is conducive to the aging of protection SBS.Solve a puzzlement difficult problem for a long time in the industry, expand the weather resistance of modifying asphalt.
4. the waste rubber after Pintsch process and pitch combine by the present invention's innovation dexterously, and then in conjunction with SBS, technique is simple, and successful, environmental protection is easy to control, and cost performance is high, is worthy to be popularized.
Embodiment
Below in conjunction with specific embodiment, the present invention is described in detail.
Embodiment 1
Step 1: in massfraction, adds the SBS of 4 parts in the 70#SK pitch of 96 parts, high speed shear 45min under 170 ~ 190 DEG C of conditions, and shearing rotating speed is 3000r/min.
Step 2: transferred to by the SBS modifying asphalt sheared on high speed dispersor and stir growth 150min, mixing speed is 800 ~ 900r/min, adds the sulphur amounting to 0.15 part in process several times, obtained modifying asphalt.
Obtained modifying asphalt is numbered 1, and performance is in table 1.
Embodiment 2
Step 1: by the full rubber powder of 20 object junked tire, join in constant-pressure and high-temperature duplex desulfurization equipment, at 300 DEG C, be class bituminous material by waste rubber Pintsch process after 20min, in mass fraction, by the waste rubber Pintsch process class bituminous material of 30 parts, the SK heavy traffic paving asphalt of 70 parts, in asphalt tank, be mixed with waste rubber cracking transform asphalt mother liquid, mixing temperature is 160 DEG C, and rotating speed is 50r/min, and the time is 10min.
Step 2: above-mentioned mother liquor is added the sulphur of 0.2%, 170 ~ 190
dEG Chigh speed shear 60min under condition, shearing rotating speed is 4000r/min.Transferred to by the modifying asphalt sheared on high speed dispersor and stir growth 120min, mixing speed is 800 ~ 900r/min, and obtained 40% waste rubber cracking transforms pitch.
Obtained modifying asphalt is numbered 2, and performance is in table 1.
Embodiment 3
Step 1: by the full rubber powder of 20 object junked tire, joining in constant-pressure and high-temperature duplex cracking equipment, at 300 DEG C, is class bituminous material by waste rubber Pintsch process after 20min.In mass fraction, by the waste rubber high-temperature split product of 30 parts, the heavy traffic paving asphalt of 70 parts, in asphalt tank, be mixed with waste rubber cracking transform asphalt mother liquid, mixing temperature is 160 DEG C, and rotating speed is 50r/min, and the time is 10min.
Step 2: in mass percentage, adds the sulphur of 0.2% by above-mentioned mother liquor, add the SBS of 4%, high speed shear 60min under 170 ~ 190 DEG C of conditions, and shearing rotating speed is 4000r/min.Transferred to by the modifying asphalt sheared on high speed dispersor and stir growth 120min, mixing speed is 800 ~ 900r/min, and obtained SBS modification waste rubber cracking transforms pitch.
Obtained modifying asphalt is numbered 3, and performance is in table 1.
Embodiment 4
Step 1: by the full rubber powder of 20 object junked tire, joining in constant-pressure and high-temperature duplex cracking equipment, at 300 DEG C, is class bituminous material by waste rubber Pintsch process after 20min.In mass fraction, by the waste rubber high-temperature split product of 30 parts, the heavy traffic paving asphalt of 70 parts, in asphalt tank, be mixed with waste rubber cracking transform asphalt mother liquid, mixing temperature is 160 DEG C, and rotating speed is 50r/min, and the time is 10min.
Step 2: in mass percentage, adds the sulphur of 0.2% by above-mentioned mother liquor, add the SBS of 2%, high speed shear 60min under 170 ~ 190 DEG C of conditions, and shearing rotating speed is 4000r/min.Transferred to by the modifying asphalt sheared on high speed dispersor and stir growth 120min, mixing speed is 800 ~ 900r/min, and obtained SBS modification waste rubber cracking transforms pitch.
Obtained modifying asphalt is numbered 4, and performance is in table 1.
Embodiment 5
Step 1: by the full rubber powder of 20 object junked tire, joining in constant-pressure and high-temperature duplex cracking equipment, at 300 DEG C, is class bituminous material by waste rubber Pintsch process after 20min.In mass fraction, by the waste rubber high-temperature split product of 20 parts, the heavy traffic paving asphalt of 80 parts, in asphalt tank, be mixed with waste rubber cracking transform asphalt mother liquid, mixing temperature is 160 DEG C, and rotating speed is 50r/min, and the time is 10min.
Step 2: in mass percentage, adds the sulphur of 0.2% by above-mentioned mother liquor, add the SBS of 4%, high speed shear 60min under 170 ~ 190 DEG C of conditions, and shearing rotating speed is 4000r/min.Transferred to by the modifying asphalt sheared on high speed dispersor and stir growth 120min, mixing speed is 800 ~ 900r/min, and obtained SBS modification waste rubber cracking transforms pitch.
Obtained modifying asphalt is numbered 5, and performance is in table 1.
Embodiment 6
Step 1: by the full rubber powder of 60 object junked tire, joining in constant-pressure and high-temperature duplex cracking equipment, at 260 DEG C, is class bituminous material by waste rubber Pintsch process after 20min.In mass fraction, by the waste rubber high-temperature split product of 10 parts, the heavy traffic paving asphalt of 90 parts, in asphalt tank, be mixed with waste rubber cracking transform asphalt mother liquid, mixing temperature is 160 DEG C, and rotating speed is 50r/min, and the time is 10min.
Step 2: in mass percentage, adds the sulphur of 0.2% by above-mentioned mother liquor, add the SBS of 4%, high speed shear 60min under 170 ~ 190 DEG C of conditions, and shearing rotating speed is 4000r/min.Transferred to by the modifying asphalt sheared on high speed dispersor and stir growth 120min, mixing speed is 800 ~ 900r/min, and obtained SBS modification waste rubber cracking transforms pitch.
Obtained modifying asphalt is numbered 6, and performance is in table 1.
The performance of modified bitumen that table 1 embodiment 1 ~ 6 obtains
Embodiment 2,3 contrasts visible, and the stability that waste rubber cracking transforms pitch is better, but the performances such as softening temperature are lower, and after adding SBS, performance is significantly improved, and illustrates that modifying asphalt has good performance and thermostability; 5 DEG C of ductilities are mostly greater than 30cm, have good low-temperature performance; Isolation test softening point difference, within 2 DEG C, has good hot storage stability; 135 DEG C of bonding nearly 3Pas (the same), also have good construction workability.Contrast 1 and 5 is visible, and under equal SBS consumption, the performance that waste rubber cracking transforms pitch is better, shows to have higher cost performance.
The present invention is not limited to aforesaid embodiment.The present invention expands to any new feature of disclosing in this manual or any combination newly, and the step of the arbitrary new method disclosed or process or any combination newly.
Claims (8)
1. waste rubber cracking transforms a preparation method for modifying asphalt, it is characterized in that, comprises following steps:
(1) waste rubber cracking conversion is obtained cracking and transform rubber;
(2) by weight ratio be 60/40 ~ 95/5 heavy traffic paving asphalt/cracking transform rubber when temperature is 150 ~ 180 DEG C, mix, obtain waste rubber and transform asphalt mother liquid;
(3) by mass ratio be above-mentioned waste rubber transform asphalt mother liquid 1 ~ 6% SBS join in the conversion asphalt mother liquid of 170 ~ 190 DEG C, utilize high shearing mixing emulsor or colloidal mill, temperature remains on 170 ~ 190 DEG C, shear dispersion, then stir on high speed dispersor and grow, and between this stirring growth period, drop into co-crosslinker, finally prepare high performance waste rubber cracking and transform modifying asphalt.
2. waste rubber cracking according to claim 1 transforms the preparation method of modifying asphalt, it is characterized in that, in described step (1), waste rubber cracking being transformed the detailed process obtaining cracking conversion rubber is: by waste Crumb rubber by normal pressure duplex cracker, 10-30min is processed at 260-360 DEG C of temperature, make waste rubber cracking be converted into thick class bituminous material, namely cracking transforms rubber.
3. waste rubber cracking according to claim 1 transforms the preparation method of modifying asphalt, it is characterized in that, in step (3), between the stirring growth period, control mixing speed is 300 ~ 1000r/min, stirring reaction 60 ~ 150min.
4. waste rubber cracking according to claim 1 transforms the preparation method of modifying asphalt, and it is characterized in that, the waste rubber in described step (1) is the rubber powder ground after junked tire fragmentation, and order number is 15-60 order.
5. waste rubber cracking according to claim 1 transforms the preparation method of modifying asphalt, it is characterized in that, in step (3), described SBS is line style styrene-butadiene-styrene, wherein the mass ratio of vinylbenzene and divinyl is 3/7, and molecular weight is 60,000 ~ 300,000.
6. waste rubber cracking according to claim 1 transforms the preparation method of modifying asphalt, it is characterized in that, the cracking obtained in described step (1) transforms rubbery collosol content and is greater than 60%, and mooney viscosity is lower than 40.
7. waste rubber cracking according to claim 1 transforms the preparation method of modifying asphalt, it is characterized in that, in step (3), described in the linking agent that adds be sulphur.
8. the waste rubber cracking that the preparation method that the waste rubber cracking according to claim 1 ~ 7 any one transforms modifying asphalt obtains transforms modifying asphalt.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105331330A (en) * | 2015-12-16 | 2016-02-17 | 甘肃恒达路桥工程集团有限公司中心试验室 | Ultraviolet-resistant bituminous pavement crack filling glue and preparation method thereof |
| CN105778530A (en) * | 2016-03-14 | 2016-07-20 | 中交益通（北京）科技有限公司 | SBS-rubber composite modified asphalt and preparation method thereof |
| CN106009720A (en) * | 2016-05-23 | 2016-10-12 | 江苏天诺道路材料科技有限公司 | Composite modified asphalt with stable thermal storage performance and preparation method thereof |
| CN109678399A (en) * | 2019-02-25 | 2019-04-26 | 内蒙古高等级公路建设开发有限责任公司 | A kind of Warm-Mix Bitumen Mixture and preparation method thereof |
| CN109705365A (en) * | 2018-12-29 | 2019-05-03 | 江苏宝利国际投资股份有限公司 | A kind of preparation method of environment-friendly type composite modified asphalt |
| CN111925659A (en) * | 2020-07-30 | 2020-11-13 | 江苏宝利国际投资股份有限公司 | Self-healing modified asphalt and preparation method and application thereof |
| CN114316357A (en) * | 2021-12-29 | 2022-04-12 | 江苏宝利国际投资股份有限公司 | Preparation method of reactive rubber for modified asphalt |
| CN114752108A (en) * | 2022-05-13 | 2022-07-15 | 长沙理工大学 | Method for degrading waste tire rubber into asphalt-like material |
| CN115160806A (en) * | 2022-07-18 | 2022-10-11 | 甘肃公航旅低碳科技有限公司 | Preparation method and application of low-carbon asphalt based on recycled resources |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105778530B (en) * | 2016-03-14 | 2019-01-29 | 中交益通（北京）科技有限公司 | A kind of SBS- rubber composite modified pitch and preparation method thereof |
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| CN109705365A (en) * | 2018-12-29 | 2019-05-03 | 江苏宝利国际投资股份有限公司 | A kind of preparation method of environment-friendly type composite modified asphalt |
| CN109705365B (en) * | 2018-12-29 | 2021-12-07 | 江苏宝利国际投资股份有限公司 | Preparation method of environment-friendly composite modified asphalt |
| CN109678399A (en) * | 2019-02-25 | 2019-04-26 | 内蒙古高等级公路建设开发有限责任公司 | A kind of Warm-Mix Bitumen Mixture and preparation method thereof |
| CN109678399B (en) * | 2019-02-25 | 2019-09-20 | 内蒙古高等级公路建设开发有限责任公司 | A kind of Warm-Mix Bitumen Mixture and preparation method thereof |
| CN111925659A (en) * | 2020-07-30 | 2020-11-13 | 江苏宝利国际投资股份有限公司 | Self-healing modified asphalt and preparation method and application thereof |
| CN114316357A (en) * | 2021-12-29 | 2022-04-12 | 江苏宝利国际投资股份有限公司 | Preparation method of reactive rubber for modified asphalt |
| CN114752108A (en) * | 2022-05-13 | 2022-07-15 | 长沙理工大学 | Method for degrading waste tire rubber into asphalt-like material |
| CN114752108B (en) * | 2022-05-13 | 2023-07-25 | 长沙理工大学 | Method for degrading waste tire rubber into asphalt |
| CN115160806A (en) * | 2022-07-18 | 2022-10-11 | 甘肃公航旅低碳科技有限公司 | Preparation method and application of low-carbon asphalt based on recycled resources |
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