CN1609165A - Waste rubber powder modified asphalt and its prepn process - Google Patents
Waste rubber powder modified asphalt and its prepn process Download PDFInfo
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- CN1609165A CN1609165A CN 200310104905 CN200310104905A CN1609165A CN 1609165 A CN1609165 A CN 1609165A CN 200310104905 CN200310104905 CN 200310104905 CN 200310104905 A CN200310104905 A CN 200310104905A CN 1609165 A CN1609165 A CN 1609165A
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- 239000010426 asphalt Substances 0.000 title claims abstract description 67
- 229920001971 elastomer Polymers 0.000 title claims abstract description 64
- 239000005060 rubber Substances 0.000 title claims abstract description 64
- 239000002699 waste material Substances 0.000 title claims abstract description 44
- 239000000843 powder Substances 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims description 15
- 230000008569 process Effects 0.000 title claims description 7
- 239000010920 waste tyre Substances 0.000 claims abstract description 31
- 239000000203 mixture Substances 0.000 claims abstract description 11
- 238000002360 preparation method Methods 0.000 claims abstract description 9
- 229920002209 Crumb rubber Polymers 0.000 claims description 30
- 239000000126 substance Substances 0.000 claims description 13
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical group [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 12
- 230000035515 penetration Effects 0.000 claims description 11
- 239000002245 particle Substances 0.000 claims description 7
- 239000011787 zinc oxide Substances 0.000 claims description 6
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- VUBOQPNQIMKEKI-UHFFFAOYSA-N 3,8-dithiatricyclo[5.1.0.02,4]oct-5-en-4-ol Chemical compound C12SC2C=CC2(O)C1S2 VUBOQPNQIMKEKI-UHFFFAOYSA-N 0.000 claims description 2
- 239000005864 Sulphur Substances 0.000 claims description 2
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 claims description 2
- 239000004615 ingredient Substances 0.000 claims 1
- 238000003860 storage Methods 0.000 abstract description 15
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 238000010008 shearing Methods 0.000 abstract description 3
- 239000000084 colloidal system Substances 0.000 abstract 1
- 238000009776 industrial production Methods 0.000 abstract 1
- 239000003381 stabilizer Substances 0.000 abstract 1
- 229920002725 thermoplastic elastomer Polymers 0.000 abstract 1
- 239000011295 pitch Substances 0.000 description 23
- 229920000468 styrene butadiene styrene block copolymer Polymers 0.000 description 12
- 238000002955 isolation Methods 0.000 description 6
- 239000006185 dispersion Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 239000003795 chemical substances by application Substances 0.000 description 4
- 229920000642 polymer Polymers 0.000 description 4
- 229920003048 styrene butadiene rubber Polymers 0.000 description 4
- 239000002174 Styrene-butadiene Substances 0.000 description 3
- 239000004566 building material Substances 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 239000008187 granular material Substances 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 239000003607 modifier Substances 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 230000008961 swelling Effects 0.000 description 2
- 239000004322 Butylated hydroxytoluene Substances 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 229940095259 butylated hydroxytoluene Drugs 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 238000005119 centrifugation Methods 0.000 description 1
- 238000005354 coacervation Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000005338 heat storage Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000001000 micrograph Methods 0.000 description 1
- 239000013502 plastic waste Substances 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 150000003254 radicals Chemical class 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 238000005987 sulfurization reaction Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
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- Road Paving Structures (AREA)
Abstract
The present invention provides one kind of waste rubber powder modified asphalt and its preparation process. In the temperature of 150-200 deg.c, waste tyre rubber powder of different grain size within 60 mesh, thermoplastic rubber and stabilizer in certain proportion are added into asphalt; and the mixture is processed in high shearing apparatus or colloid mill to prepare the asphalt product with high storage stability and excellent high and low temperature performance. The simple production process is suitable for industrial production.
Description
Technical field
The present invention relates to rubber modified asphalt and preparation method thereof, relate in particular to Crumber rubber modified asphalt of a kind of storage-stability and preparation method thereof.
Background of invention
Constantly perfect along with the road traffic system, social economy and rapid development of automobile industry, the junked tire amount that various vehicles produce increases year by year, except that rubber industry and other industry can partly be utilized, also has suitable surplus.
At present, handle and utilize the method for waste tire rubber mainly contain cracking, as additives for building materials or weighting agent, as several modes such as additive of road bitumen.Cracking process exists complex process, operational difficulty, poor product quality, easily produces deficiencies such as environmental pollution.Can only be as material of construction as linkrusta, glue watt, rubber sheet etc., but the consumption of these building material products is limited.The levigate waste Crumb rubber that becomes of junked tire is used for the build of asphalt roads road surface, help eliminating environmental pollution, and demand is bigger, waste tire rubber can be made full use of.And can also improve the performance of bituminous pavement.This pitch can be used for the making construction on noise reduction road surface, will make the Urban traffic noise obtain more effectively suppressing, and helps environment protection, and the technical progress to the road bitumen material simultaneously has certain promoter action.In addition, can improve heat-resisting, the winter hardiness on road surface, strengthen the distance of anti-skid and then shortening drag, improve safety coefficient with the bituminous pavement of waste rubber powder asphalt paving.
Waste Crumb rubber is different from styrene-butadiene-styrene block copolymer (hereinafter to be referred as SBS), styrene-butadiene rubber(SBR) (hereinafter to be referred as SBR), its composition is very complicated, contain the polymkeric substance of carbon black, high-molecular weight hydrocarbon polymer etc., be difficult to make the waste Crumb rubber particle can be evenly dispersed in the pitch, the consistency that is pitch and waste rubber is bad, waste tire rubber powder can not stable dispersion in heated bitumen, and when not stirring the heat storage, sedimentation will take place shoddy.Adopt the reason of situ production waste rubber powder modified asphalt in the relevant in the past construction that Here it is.
In order to promote the technical development of waste Crumb rubber modified asphalt, solve the stability in storage of waste rubber powder modified asphalt, be its key problem in technology.CN1114258A discloses a kind of waste rubber tire and has been used for round-the-clock track and field runway recycling of materials method, and waste rubber tire is whittled into fine strip shape and fine powder, mixes use with pitch etc.This method also is the on-the-spot use of situ production, do not solve the problem of package stability, and consumption seldom, can not utilize waste tire rubber on a large scale.CN1170733A discloses a kind of method of producing asphalt modifier with waste rubber, and waste rubber or waste rubber and plastic waste are heated to 200～500 ℃, by shear, make under the effect of extruding and the mechanical force that stirs the paste melts properties-correcting agent.When this asphalt modifier mixes with pitch, still do not solve storage stability, and waste tire rubber belongs to thermoset rubber, heat can not make its efficient melting, and therefore this method is not suitable for waste tire rubber." in New Building Materials calendar year 2001 the tenth first phase " application practice of the waste rubber powder modified asphalt " literary composition, the author mentioned before rubber powder joins pitch, carried out modification earlier, add so-called free radical on the surface, join in the pitch then, thereby make system stable, but this complex technical process.
Summary of the invention
At the deficiencies in the prior art, the invention provides a kind of waste-tyre rubber-powder that utilizes, and cooperate suitable materials such as SBS produce a kind of stability in storage preferably, the waste Crumb rubber pitch that has good high and low temperature performance, be fit to produce in enormous quantities, and the production method of this modifying asphalt.
Waste Crumb rubber modified asphalt of the present invention its composition by weight comprises:
Basic asphalt 8 8.5%～97.4%
Polymkeric substance 0.5%～5%
Waste tire rubber 1%～6%
Stablizer 0.1%～0.5%
Above-mentioned basic asphalt can be vacuum residuum, straight-run pitch, also can be the various pitches such as blending pitch that mixing process obtains, (25 ℃ of its basic asphalt penetration degrees, 0.1mm): 40～300, softening temperature is 33 ℃～58 ℃. used polymkeric substance can be selected rubber general in the ordinary rubber modifying asphalt for use, as SBS, SBR rubber etc., waste tire rubber powder can be selected commercially available various rubber powders for use.Stablizer comprised the sulfuration or the material or the sulfur-containing polymer of crosslinked action, as zinc oxide, sulphur, stearate, polyalkylbenzene phenol disulphide etc., also can be one or more mixture wherein.
The preparation process of using rubber powder of waste tire modifying asphalt of the present invention is as follows:
(1) at first with basic asphalt heat fused under 150 ℃～200 ℃ temperature;
(2) add 0.5%～5% the polymkeric substance account for the basic asphalt total amount in the basic asphalt said temperature down cut 30～90 minutes; High-speed shearing equipment can be selected conventional high-speed shearing equipment, as colloidal mill, high shear mixer etc.;
(3) and then add using rubber powder of waste tire, granular size is: by the waste tire rubber powder of 60 mesh sieve or thinner waste Crumb rubber, generally can select the waste Crumb rubber by 80～200 mesh sieve for use, content is to account for 1%～6% of basic asphalt total amount;
(4) add stablizer in step (3), content is to account for 0.1%～0.5% of basic asphalt, continues to shear the waste Crumb rubber modified asphalt that can make stable storing in 60～120 minutes under said temperature.
Can certainly add waste Crumb rubber earlier, adding polymkeric substance and stablizer, polymerization and waste Crumb rubber once can also be dropped into then.Preferred above-mentioned preparation scheme.
Scrap tire rubber can not be crosslinked with pitch, its composition complexity, and also rubber powder granule is almost very difficult by the oil content swelling in the pitch, therefore is difficult to form stable dispersion system with pitch.Waste tire rubber modifying asphalt of the present invention is common properties-correcting agent with using rubber powder of waste tire and polymkeric substance, and polymkeric substance and using rubber powder of waste tire synergy when improving modifying asphalt high and low temperature performance, can also strengthen anti-skid, reduce noise.The more important thing is, after two kinds of properties-correcting agent disperse in basic asphalt, form a kind of mutual synergistic dispersion system, the stablizer that is added more helps promoting the dispersion of scrap tire rubber in pitch, and can stop waste tire rubber powder and bituminous centrifugation, improve the stability of dispersion system, make the waste tire rubber powder modified asphalt that to stablize storage have good shelf characteric, help the widespread use of waste tire rubber powder modified asphalt.The preparation process of waste tire rubber modifying asphalt of the present invention adopts specific stablizer, can obtain to be uniformly dispersed, the modified bitumen product of shelf-stable, and method is simple, and easy handling, energy consumption is lower.
Description of drawings
Fig. 1, Fig. 2 are the optical microscopic morphology of the embodiment of the invention 4 modified bitumen product after upper and lower part behind the isolation test is amplified 100 times.
Embodiment
The storage test that the present invention relates to is with reference to the polymer modified asphalt standard, concrete grammar is as follows: asphalt sample is poured in the elongated pipe, in 163 ± 5 ℃ thermostat container, place after 48 hours, vertically put into refrigerator-freezer freezing 4 hours, be divided into three sections, get upper and lower two sections and survey its softening temperatures, when upper and lower softening temperature difference during less than 2.5 ℃, just think that bituminous composition is stable, storge quality is good.This storage standard is at as polymer modified asphalts such as SBS, SBR, and the waste Crumb rubber that the present invention selects for use, its proportion is bigger, stores bottom, back softening temperature to be higher than the top softening temperature, and upper and lower softening temperature difference all be a negative value, and the part rubber powder sinks and has gathered to get off.Qualified in order to illustrate that prepared waste Crumb rubber modified asphalt stores, the regulation waste Crumb rubber modified asphalt stores the upper and lower softening temperature difference in back at-2.5 ℃～2.5 ℃ in the present invention's test, just thinks the asphaltic products. stable storing.
Embodiment 1
400 gram penetration degrees (25 ℃, 0.1mm): 89 basic asphalt, first heat fused; The SBS rubber (used SBS rubber is taken from Yueyang petrochemical industry among the embodiment) of adding 3% was sheared 60 minutes at 175 ℃; And then add the waste tire rubber powder that 2% 80 orders sieve, and add the zinc oxide of 0.5g simultaneously again, under uniform temp, continue to shear 60 minutes through high shear mixer.The main performance index of gained asphaltic products. is: (25 ℃ of penetration degrees, 0.1mm): 80, (5 ℃ of ductilities, 5cm/min, cm): 57, softening temperature (℃): 57.9, isolation test, up and down softening temperature poor (℃) be-1.6, illustrate that the waste Crumb rubber particle is uniformly dispersed in pitch, stability in storage is good.
Embodiment 2
400 gram penetration degrees (25 ℃, 0.1mm): 122 basic asphalt, first heat fused; Add 1% SBS rubber then, sheared 30 minutes at 160 ℃; And then add 5% 140 order waste tire rubber powders, and add 2.0g zinc oxide simultaneously again, sheared 120 minutes through high shear mixer at 180 ℃.The main performance index of gained asphaltic products. is: penetration degree (25 ℃, 0.1mm): 104, ductility (5 ℃, 5cm/min, cm): 11, softening temperature (℃): 48.1, isolation test, up and down softening temperature poor (℃) :-2.3, stability in storage is qualified.
Embodiment 3
Present embodiment is compared with embodiment 2, and difference is, has increased the add-on of SBS, and present embodiment adds 4% SBS rubber, and the particle diameter of rubber powder is 200 orders.The main performance index of gained asphaltic products. is: (25 ℃ of penetration degrees, 0.1mm): 94, (5 ℃ of ductilities, 5cm/min, cm): 46, softening temperature (℃): 56.6, isolation test, up and down softening temperature poor (℃) :-1.2, illustrate that the waste Crumb rubber particle is uniformly dispersed in pitch, and resulting asphaltic products. performance is also relatively good.
Embodiment 4
400 gram penetration degrees (25 ℃, 0.1mm): 122 basic asphalt, first heat fused; Add 5% SBS rubber then, sheared 90 minutes at 190 ℃; And then add 3% 120 purpose waste tire rubber powders; Add simultaneously 1.0g zinc oxide and 1.0g 2 again, the mixture of 2-curing two (6-Butylated Hydroxytoluene) continues to shear 90 minutes through high shear mixer under uniform temp.The main performance index of gained asphaltic products. is: penetration degree (25 ℃, 0.1mm): 112, ductility (5 ℃ of 5cm/min, cm): 54, softening temperature (℃): 56.4, isolation test, up and down softening temperature poor (℃) :-1.4.Get the sample after the storage, with the upper and lower asphalt sample of observation by light microscope, its optical microscopic morphology is seen Fig. 1 and Fig. 2.Comparative example
400 gram penetration degrees (25 ℃, 0.1mm): 120 basic asphalt, first heat fused; And then add 5% 140 order waste tire rubber powders, and add 2.0g zinc oxide simultaneously again, sheared 120 minutes through high shear mixer at 180 ℃.The main performance index of gained asphaltic products. is: penetration degree (25 ℃, 0.1mm): 107, ductility (5 ℃, 5cm/min, cm): 10, softening temperature (℃): 45.1, isolation test, up and down softening temperature poor (℃) :-10.5, stability in storage is bad.
Waste rubber is different from polymkeric substance such as SBS, can not form crosslinked spacial framework in pitch, its composition complexity, and also rubber powder granule almost is difficult to by tar middle oil part swelling.Be negative value by softening temperature difference about the storage test discovery waste Crumb rubber pitch storage back, clearly most of rubber powder granule all sinks and has gathered to get off, and must make stable being dispersed in the pitch of waste Crumb rubber so will prepare the waste old powder-modified asphalt of stable storing.Adopt the invention process method 4 prepared modifying asphalts can solve the stability in storage of waste Crumb rubber modified asphalt, make waste Crumb rubber be dispersed in more uniformly in the pitch and layering, coacervation do not take place.By microphotograph Fig. 1, Fig. 2 after storing, the waste Crumb rubber particle can be dispersed in the pitch more uniformly as can be seen.Softening temperature is poor up and down in storage test, and its value illustrates that for-1.4 ℃ the waste Crumb rubber particle is uniformly dispersed in pitch.The bituminous softening temperature is 56.4 ℃ after the modification, and the softening temperature of asphalt stock is 44.4 ℃, modification is described after the bituminous high-temperature behavior have significant improvement.
Claims (8)
1, a kind of waste Crumb rubber modified asphalt is characterized in that its composition comprises by weight:
Basic asphalt 88.5%～97.4%,
Polymkeric substance 0.5%～5%,
Waste tire rubber 1%～6%,
Stablizer 0.1%～0.5%.
2,, it is characterized in that described basic asphalt is selected from vacuum residuum, straight-run pitch, blending pitch according to the described modifying asphalt of claim 1.
3, according to claim 1 or 2 described modifying asphalts, it is characterized in that described basic asphalt penetration degree (25 ℃, 0.1mm): 40～300, softening temperature is 33 ℃～58 ℃.
4,, it is characterized in that described polymkeric substance is selected from SBS, SBR rubber according to the described modifying asphalt of claim 1.
5, according to the described modifying asphalt of claim 1, the particle diameter that it is characterized in that described waste tire rubber powder is by the waste tire rubber powder of 60 mesh sieve or thinner waste Crumb rubber.
6, according to the described modifying asphalt of claim 1, it is characterized in that described stablizer is selected from zinc oxide, sulphur, stearate, polyalkylbenzene phenol disulphide, also can be one or more mixture wherein.
7, the described modified asphalt preparation method of the arbitrary claim of a kind of claim 1～6, adopt following process:
(1) at first with basic asphalt heat fused under 150 ℃～200 ℃ temperature;
(2) add 0.5%～5% the polymkeric substance account for the basic asphalt total amount in the basic asphalt said temperature down cut 30～90 minutes;
(3) and then add using rubber powder of waste tire, granular size is for by the waste tire rubber powder of 60 mesh sieve or thinner waste Crumb rubber, and content is to account for 1%～6% of basic asphalt total amount;
(4) add stablizer in step (3), content is to account for 0.1%～0.5% of basic asphalt, continues can make in 60～120 minutes at the said temperature down cut waste Crumb rubber modified asphalt of stable storing.
8,, it is characterized in that order of addition(of ingredients) in the preparation process of described waste Crumb rubber modified asphalt for also adding waste Crumb rubber earlier, is adding polymkeric substance and stablizer then, or polymkeric substance and waste Crumb rubber are once dropped into according to the described method of claim 7.
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| CNB2003101049055A CN1313566C (en) | 2003-10-24 | 2003-10-24 | Waste rubber powder modified asphalt and its prepn process |
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2003
- 2003-10-24 CN CNB2003101049055A patent/CN1313566C/en not_active Expired - Lifetime
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