CN103408953B - A kind of bituminous grouting rubber grain properties-correcting agent and preparation method - Google Patents
A kind of bituminous grouting rubber grain properties-correcting agent and preparation method Download PDFInfo
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Abstract
The invention discloses a kind of bituminous grouting rubber grain properties-correcting agent and preparation method, its composition and parts by weight are: 20-30 part petroleum pitch, 10-15 part rock asphalt, 40-60 part waste tire rubber powder, 2-5 part softening agent, 3-6 part polyethylene.The present invention take hard petroleum asphalt as the excessive medium of liquid, the crumb rubber after softening of degrading is filled with rock asphalt, high temperature degradation shoddy is realized in dual-screw-stem machine, and soften shoddy with softening agent, make rubber powder molecular structure relative loose, recharge rock asphalt, obtained properties-correcting agent has the advantage improving pitch high temperature performance concurrently, its modifying asphalt is made to reach PG88-28, performance is much better than other polymer modified asphalts, and modified bitumen product is not emanated, is not precipitated, can long-term cold and hot storage.The present invention and bitumen compatibility excellence, the routine techniques index of pitch is better than traditional rubber asphalt, can significantly simplify rubber modified asphalt production technique and modified device, improves modifying asphalt production efficiency, reduces production cost.
Description
Technical field
The invention belongs to field of road, particularly relate to a kind of bituminous grouting rubber grain properties-correcting agent and preparation method.
Background technology
According to statistics, China has the damaged tire of 74% to become solid pollutant every year, and the junked tire of China in 2011 has reached 200,000,000, and waste rubber reaches 5,200,000 tons.Because the environmental problem that junked tire is stacked, burning causes seriously perplexs environmentalist.In field of road, become effective method using waste old as properties-correcting agent, rubber asphalt technology also receives much concern with the pavement performance of its excellence and significant environment protection significance.Practice at home and abroad proves: rubber asphalt technology is to improve in road surface antifatigue, weather resistance, anti-low-temperature cracking, prevention progress of fracture, noise reduction etc. effect remarkable, but road pavement high temperature anti-rut behavior improves poor.
Rubber asphalt technology main at present has two large classes: dry method and wet method.Dry method rubber powder is rendered to batching plant together with pitch, mineral aggregate and additive, direct production rubber-asphalt mixture.Wet method is the rubber asphalt that first manufactures a finished product, regenerative ratio asphalt.And the latter produce performance of asphalt mixture and stability all better, be therefore widely used.But conventional finished product rubber asphalt is produced and in use procedure, because rubber powder is dispersed undesirable in matrix pitch, usually need the high-speed mixing equipments such as colloidal mill; The rubber asphalt of situ production, need special production unit, storage time is shorter, and no longer than 3 days, and need continuously stirring, temperature remains on 145-155 DEG C.On the one hand, the rubber powder pitch (17%, massfraction) when rubber powder volume is large of this technology, asphalt can only adopt gap gradation, and can not be applied to common dense bitumen compound, and cost is high, and utilization ratio is lower.The problems such as on the other hand, this rubber asphalt is faced with high temperature storage and easily emanates, and long-time long distance transportation product segregation is serious.And guarantee that rubber asphalt has preferably high temperature anti-rut behavior, usually require that rubber powder volume (is mixed at 17-30% outward, massfraction) between, the Ministry of Communications JTT 798-2011 " highway engineering waste rubber tyre powder rubber asphalt " regulation rubber asphalt 180 DEG C of rotary viscosities are not less than 1.5Pa.s, 5 DEG C of ductilities are minimum is not less than 5cm (hot-zone), namely require that rubber powder volume is large, viscosity is high, and low temperature flexibility is good.Technician adopts the composite modified or composite modified situation realizing this multi-win of rubber powder/rock asphalt of rubber powder/SBS, patent 201210512058.5 relates to a kind of radiactive and branching block copolymer and preparation method thereof, by the petroleum pitch of the rubber powder of 1-10 part, 1-10 part softening agent and 80-98 part or rock asphalt by means of only simple high-speed shearing machine blended realize composite modified, improve rubber powder plasticity by the softening agent of large dosage, increase the compatible of itself and pitch.But the method provided in this patent using rock asphalt or petroleum pitch as dispersion medium, using rubber as disperse phase, it is a kind of traditional rubber modified asphalt method, because its rubber powder volume is little, still need to adopt high-speed shearing machine to grind 80 minutes (180 DEG C), production efficiency is lower, and complete processing is complicated.In addition, the consistency of shoddy and pitch is poor, and existing technical staff reduces the volume of rubber powder usually as far as possible, even if large dosage is also no more than 25%.And the in-situ processing of rubber powder normally adds the thin rubber powder of 80-100 object or desulfurization rubber powder, this tooling cost increased undoubtedly.It is short for on-the-spot storage time that the problems referred to above cause existing technical staff cannot solve rubber powder modified asphalt, factorial praluction efficiency is low, need the problems such as colloidal mill, therefore developing large, instant, that hot storage stability the is excellent rubber modified asphalt of rubber powder volume is the beneficial direction expanding shoddy efficiency utilization.
Rock asphalt is that a kind of composition is close with petroleum pitch, and asphalt content is comparatively large, is rich in the rock asphalt of certain mineral substance ash content.Its modifying asphalt receives much concern with advantages such as easy construction, economical rationality, high temperature Rut resistance Be very effective.Patent 201110249447.9 provides a kind of processes of rock asphalt modified asphalt and preparation method thereof, this technology with import rock asphalt for raw material, directly by the rock asphalt doped matrix pitch of 5-10 part, but the ductility of pitch 15 DEG C decays to 28.5cm when the volume of rock asphalt reaches 10 parts, do not met No. 50 C level pitch 15 DEG C of ductilities in F40-2004 " standard specification for construction and acceptance of highway asphalt pavement " and be greater than the requirement of 30cm, namely its low-temperature cracking-resistance is badly damaged.Most research points out the volume of rock asphalt not easily more than 15% (massfraction), and the impact of the volume too high low temperature flexibility on pitch is comparatively large, increases the risk of Asphalt Mixture at Low Temperature cracking.This is mainly because the ash content usually containing 15-35% in rock asphalt, and the sedimentation of ash content causes the segregation of modifying asphalt.In addition, this patent is pointed out to realize rock asphalt modification by simply stirring without the need to specific equipments such as colloidal mills, but the rock asphalt place of production is different, softening temperature differs greatly, the rock asphalt that softening temperature is lower just can directly be distributed in pitch without the need to colloidal mill, and softening temperature is higher than the superhard rock asphalt quite difficulty of 150 DEG C, the softening point range of rock asphalt is not described in patent, the dispersion of the difficult superhard rock asphalt of simple blending technology in pitch, melting problem.If be filled into by levigate rock asphalt in rubber powder network, to rubber powder modified, then can improve the utilization ratio of rock asphalt, alleviate its problem because of consumption too high loss pitch low-temperature performance, strengthen rubber powder simultaneously and effect is improved to high temperature performance of asphalt.
Above-mentioned restriction broken through exactly by bituminous grouting rubber grain properties-correcting agent, realizes the pre-treatment of instant shoddy with wide, cheap starting material of originating.With the rock asphalt of high softening-point, gilsonite filled rubber, under the effect of the mechanical shear stress of dual-screw-stem machine, rock asphalt and hard pitch are filled in the rubbery system of pre-desulfurization jointly.When not damaging the feature of rubber own, improving rubber powder and effect is improved to high temperature performance of asphalt; Simultaneously because rock asphalt itself and pitch form close, when these components are filled in rubber powder, make the solubility parameter of rubber powder and pitch closer to, thus make properties-correcting agent and pitch blended time obtain preferably blended effect, consistency is better than independent waste Crumb rubber and high softening-point rock asphalt, and realizes instant effect.To sum up, bituminous grouting rubber grain properties-correcting agent and pitch have good consistency, just fully can mix with pitch at 170--180 DEG C, without the need to shearing device, only stir and properties-correcting agent just can be made fully to disperse in pitch, make its situ production become possibility.In addition, this technology can increase the adhesivity of modifying asphalt, and stability of asphalt mixture increases, and can be adapted to continuous dense bitumen compound, thus increases the utilization ratio of rubber powder further.
Summary of the invention
The present invention is directed to existing rubber asphalt to high temperature performance of asphalt improve not obvious and and bitumen compatibility poor, rock asphalt modification damages pitch low-temperature performance, the problem such as ash content free settling in rock asphalt, the bituminous grouting rubber grain properties-correcting agent that exploitation rock asphalt small molecules and rubber polymer are filled.This product combines the performance of hard pitch and rubber, and with it for rubber modified bitumen prepared by additive has good high-temperature behavior and low-temperature performance, and production technique is simple, and investment of production equipment is little, and production cost is low, steady quality.
In addition, for existing polymer modified asphalt with the production technique of the high speed shear dispersing apparatus such as colloidal mill, production efficiency is low, investment of production equipment is large, and production cost is high, and environmental pollution is serious, the problems such as unstable product quality, propose bituminous grouting rubber modifier, can adopt that common whipping device can manufacture a finished product, stable rubber modified asphalt, situ production or factorial praluction all can.
To achieve these goals, the present invention adopts following technical scheme.
A kind of bituminous grouting rubber grain properties-correcting agent, the composition of this properties-correcting agent and parts by weight thereof are: 20-30 part petroleum pitch, 10-15 part rock asphalt, 40-60 part waste tire rubber powder, 2-5 part softening agent, 3-6 part polyethylene.
The modified effect of above-mentioned raw materials on properties-correcting agent has different impacts.Petroleum pitch is 10# building asphalt, the low grade pitch that a kind of vacuum residuum obtains through pitch oxidation, as liquid phase medium environment in properties-correcting agent preparation process, it is the carrier in rubber powder, rock asphalt powder filling process, and play swelling rubber powder, gluing powder, be easy to the effect of granulation, improve the consistency of properties-correcting agent and pitch simultaneously.Its consumption is not easily too much, and too much affect effective constituent effect and play, cannot provide good media environment again very little, the consistency of properties-correcting agent and pitch is deteriorated thereupon.In addition, the softening temperature of this pitch should control between 90-110 DEG C, and softening temperature is not easily too low, too low not easily granulation in properties-correcting agent preparation process; Too high, the swelling action of liquid phase medium to rubber powder is poor, and properties-correcting agent low-temperature performance is not good.
Rock asphalt is the weighting agent of rubber powder, is the key ingredient that high temperature performance of asphalt improves.Its consumption is more, better to the filling effect of rubber molecule, the modifying asphalt high-temperature behavior obtained is better, but consumption is too much, exceed the consumption of rubber powder, then phase transition can occur, cause pitch to wrap up rubber powder, cause properties-correcting agent rubber property difficulty to play, the low-temperature performance of modifying asphalt may be damaged further.Its consumption also should not very little, and incomplete to the filling of rubber powder very little, high-temperature behavior improves not obvious.The softening temperature of rock asphalt is at 150--180 DEG C, and softening temperature characterizes the soft or hard degree of pitch, is the characteristic index of evt, softening temperature is not easily too high, the too high instant effect affecting properties-correcting agent, the too low high temperature modified effect to its modifying asphalt improves not obvious, therefore should control in OK range.
Waste tire rubber powder improving pitch low temperature flexibility, improve in pitch fatigue resistance there is excellent effect, the carbon black in rubber powder and a small amount of magnesium oxide, ferric oxide make it have good anti-aging and wear resistance; But the contribution of its high-temperature stability to pitch is less, is used alone and can not gives pitch obvious intensity, cause pitch to be easy under the high temperature conditions soften, trickle.The order number of rubber powder is larger, and rubber powder is thinner, and processing charges is higher.Rubber powder in the present invention should be not meticulous, is advisable with 30--40 order.Due in properties-correcting agent preparation process, processing temperature is higher, and rubber powder is meticulous, degraded serious, and have impact on the character of rubber itself in high temperature process.
Softening agent is phthalate mainly, and its effect is softening rubber powder.Plasticizer consumption very little time, can not play the effect of softening rubber powder, certain limit internal plasticizer is more, and rubber powder is more soft, more easily processes; Too many cost is too high, and sexual valence ratio, does not have application and popularization value.
Polyethylene is low density polyethylene.Poly effect is the degree of crystallinity increasing properties-correcting agent, makes blend be easy to granulation.Polyethylene is also often used to asphalt modification, but the consistency of itself and pitch is poor, and larger to the low-temperature performance damage of pitch.Therefore poly consumption is too much unsuitable, too much will make properties-correcting agent deteriorated flexibility; But consumption very little, and during granulation, modifier blends is clamminess, store easy conglomeration.
Present invention also offers a kind of preparation method of bituminous grouting rubber grain properties-correcting agent; first waste tire rubber powder is added in dual-screw-stem machine; be heated to 250--270 DEG C; add softening agent more successively, petroleum pitch, rock asphalt carry out melting, under the effect of the mechanical shear stress of twin screw extruder, micromolecular pitch is embedded among high molecular rubber; form graft compound; finally add polyethylene extruding pelletization, by dicing machine pelletizing, bituminous grouting rubber grain properties-correcting agent can be obtained.
Bituminous grouting rubber modified asphalt is that the parts by weight of each component are 15-25 part bituminous grouting rubber grain, 0.3-1.0 part stablizer, 75-85 part 70# or 90# petroleum pitch with above-mentioned properties-correcting agent and stablizer for raw material.The concrete preparation flow of modifying asphalt is as follows: matrix pitch is heated to flow state by (1) on suitable thermal source, take a certain amount of matrix pitch, under 170-180 DEG C of condition, add properties-correcting agent, adopt electric mixer stir about 5-10min, guarantee that properties-correcting agent melts completely; (2) keep temperature-resistant, stablizer is added in pitch, stir 20-30min, bituminous grouting rubber modified asphalt can be obtained.
Content of modifier is larger, and asphalt modification effect is more obvious, and asphalt viscosity is larger, and high temperature performance is excellent; Volume is too large, and the viscosity in pitch is excessive, causes bitumen construction workability not good; And volume is too little, the modified effect of properties-correcting agent to pitch is not obvious, can not obviously give pitch excellent pavement performance.
Aforementioned stable agent is vulcanizing agent, and consumption controls 0.3-1.0 part, as the linking agent of properties-correcting agent and pitch, rubber and pitch is made to set up stereoeffect, improving the mechanical property of modifying asphalt, and ensure the stability in storage of product, is the requisite part of modifying asphalt.
The invention has the beneficial effects as follows:
(1) properties-correcting agent is that over-all properties is better than the simple composite use of other single polymers properties-correcting agent or above two kinds of properties-correcting agent, has good consistency with road bitumen with micromolecular petroleum pitch, petroleum and rock asphalt filled high polymer rubber.
(2) ramollescence of bituminous grouting rubber grain properties-correcting agent in conjunction with softening agent and the high filling effect of hard pitch, blend and pitch is made to have good consistency, under 170--180 DEG C of condition, stir 5-20min just fully to mix with pitch, without the need to shearing device, the simple and fast that can realize rubber asphalt is produced.
(3) in conjunction with the advantage performance of hard pitch and rubber, the modifying asphalt being Additive Production with it has good high-temperature behavior and low-temperature performance, SHRP grading performance (PG classification) can reach PG88-28, is much better than SBS modifying asphalt and rubber modified asphalt.
(4) to compare other modified-high polymer agent, the fluffy adhesion of this product, easy to use, package storage and transport.
Bituminous grouting rubber grain properties-correcting agent provided by the invention directly adds matrix pitch and prepares high performance modified bitumen, is both applicable to factorial praluction, is also applicable to situ modified.Properties-correcting agent and bitumen compatibility good, can under 170-180 DEG C of condition, stir 5-20min and namely dissolve in pitch, pitch PG classification can reach PG88-28, and high temperature performance is excellent, and situ modified equipment is simple, easy handling.
Embodiment
Below in conjunction with embodiment, the invention will be further described.
Embodiment 1:
1, bituminous grouting rubber grain properties-correcting agent preparation flow is in dual-screw-stem machine, first add 50 parts of waste tire rubber powders; to 250 DEG C; adding 2 parts of softening agent successively, 20 parts of petroleum pitch, 13 parts of rock asphalt carry out melting; finally add 3 parts of polyethylene extruding pelletizations; by dicing machine pelletizing, bituminous grouting rubber grain properties-correcting agent can be obtained.
2, prepare bituminous grouting rubber modified asphalt with above-mentioned properties-correcting agent, its weight part consists of 25 parts of properties-correcting agent, stablizer 0.5 part, 75 parts of 70# petroleum pitch.The routine techniques index of pitch is in table 1, and PG classification is in table 2.
Table 1 bituminous grouting rubber modified asphalt routine techniques index
Table 2 bituminous grouting rubber modified asphalt PG classification
From table 1, the ductility of this bituminous grouting rubber modified asphalt is much larger than the rubber asphalt of routine, and softening temperature reaches 63 DEG C.And table 2 is visible, this pitch reaches PG88-28, and high temperature performance is all better than SBS modification or the rubber asphalt (PG76-28) of high-quality, and therefore this properties-correcting agent has preferably modified effect.
3, in accordance with China's " standard specification for construction and acceptance of highway asphalt pavement " F40-2004, with the bituminous grouting rubber plastics modified bitumen of above-mentioned preparation for agglutinate, with continuous dense bitumen compound AC-13 for asphalt type, the gradation composition of the marshall' mechanic characteristic value designing asphalt mixture that code requirement F40-2004 requires and asphalt content, the technological property of asphalt is in table 3.
Table 3 AC-13 asphalt technical indicator
| Project | Characteristic standard | Test-results | Test method |
| Bitumen aggregate ratio/% | 5.4 | ||
| Voidage/% | 3～5 | 4.3 | T 0706 |
| Void in mineral aggregate/% | Be not less than 13.0 | 16.0 | T 0705 |
| Pitch saturation ratio/% | 65～75 | 73 | T 0705 |
| Rut dynamic stability (60 DEG C, 0.7MPa)/(secondary/min) | Be not less than 2800 | 6047 | T 0719-2011 |
| Freeze-thaw split strength ratio/% | Be not less than 80 | 90 | T 0729-2000 |
| Low-temperature bending breaking strain (-10 DEG C, 5cm/min)/μ ε | Be not less than 2000 | 3600 | T 0715-2011 |
Rut dynamic stability (60 DEG C, 0.7MPa) 6047 times/min as can be seen from Table 3, exceedes general modified asphalt mixture (general 4000-5000 time/min); Water stability TSR 90% is better than rubber-asphalt mixture; Low-temperature bending breaking strain (-10 DEG C, 5cm/min) 3600 μ ε (rubber modified mixes 2530 μ ε, SBS rubber composite modified pitch compound 2700 μ ε), therefore the modified effect of this properties-correcting agent is better than SBS modified effect.
Embodiment 2:
1, properties-correcting agent preparation: bituminous grouting rubber grain properties-correcting agent preparation flow first adds 40 parts of waste tire rubber powders in dual-screw-stem machine; to 260 DEG C; adding 2.5 parts of softening agent successively, 25 parts of petroleum pitch, 10 parts of rock asphalt carry out melting; finally add 4.5 parts of polyethylene extruding pelletizations; by dicing machine pelletizing, bituminous grouting rubber grain properties-correcting agent can be obtained.
2, prepare bituminous grouting rubber modified asphalt with above-mentioned properties-correcting agent, its weight part consists of 20 parts of properties-correcting agent, stablizer 0.5 part, 80 parts of 70# petroleum pitch, and this modifying asphalt PG classification can reach PG82-28.
3, be agglutinate by above-mentioned obtained modifying asphalt, in accordance with China's " standard specification for construction and acceptance of highway asphalt pavement " F40-2004, with continuous dense bitumen compound AC-13 for asphalt type, wherein modifying asphalt is 5.4% of mixture total weight amount.
Embodiment 3:
1, properties-correcting agent preparation: bituminous grouting rubber grain properties-correcting agent preparation flow first adds 60 parts of waste tire rubber powders in dual-screw-stem machine; to 270 DEG C; adding 5 parts of softening agent successively, 30 parts of petroleum pitch, 15 parts of rock asphalt carry out melting; finally add 6 parts of polyethylene extruding pelletizations; by dicing machine pelletizing, bituminous grouting rubber grain properties-correcting agent can be obtained.
2, prepare bituminous grouting rubber modified asphalt with above-mentioned properties-correcting agent, its weight part consists of 25 parts of properties-correcting agent, stablizer 0.5 part, 75 parts of 70# petroleum pitch, and this modifying asphalt PG classification can reach PG82-28.
3, be agglutinate by above-mentioned obtained modifying asphalt, in accordance with China's " standard specification for construction and acceptance of highway asphalt pavement " F40-2004, with continuous dense bitumen compound AC-13 for asphalt type, wherein modifying asphalt is 5.4% of mixture total weight amount.
Although above-mentioned, the specific embodiment of the present invention is described; but not limiting the scope of the invention; one of ordinary skill in the art should be understood that; on the basis of technical scheme of the present invention, those skilled in the art do not need to pay various amendment or distortion that creative work can make still within protection scope of the present invention.
Claims (7)
1. a bituminous grouting rubber grain properties-correcting agent, is characterized in that, the composition of this properties-correcting agent and parts by weight thereof are: 20-30 part 10# building asphalt, 10-15 part rock asphalt, 40-60 part waste tire rubber powder, 2-5 part softening agent, 3-6 part polyethylene.
2. bituminous grouting rubber grain properties-correcting agent as claimed in claim 1, it is characterized in that, the softening temperature of described petroleum pitch is between 90-110 DEG C.
3. bituminous grouting rubber grain properties-correcting agent as claimed in claim 1, it is characterized in that, the softening temperature of described rock asphalt is at 150--180 DEG C.
4. bituminous grouting rubber grain properties-correcting agent as claimed in claim 1, it is characterized in that, described waste tire rubber powder is 30--40 order.
5. bituminous grouting rubber grain properties-correcting agent as claimed in claim 1, it is characterized in that, described softening agent is phthalic ester plasticizer.
6. bituminous grouting rubber grain properties-correcting agent as claimed in claim 1, it is characterized in that, described polyethylene is low density polyethylene.
7. the preparation method of bituminous grouting rubber grain properties-correcting agent as claimed in claim 1; it is characterized in that; first waste tire rubber powder is added in dual-screw-stem machine; to 250--270 DEG C; add softening agent more successively, petroleum pitch, rock asphalt, waste tire rubber powder carry out melting; finally add polyethylene extruding pelletization, by dicing machine pelletizing, bituminous grouting rubber grain properties-correcting agent can be obtained.
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| CN201310344343.5A CN103408953B (en) | 2013-08-08 | 2013-08-08 | A kind of bituminous grouting rubber grain properties-correcting agent and preparation method |
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| CN103408953B true CN103408953B (en) | 2015-10-28 |
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| CN106396501B (en) * | 2015-11-27 | 2019-11-12 | 北京紫瑞天成科技有限公司 | A kind of asphalt of Rut resistance and preparation method thereof |
| CN106046813B (en) * | 2016-06-07 | 2019-01-01 | 中海沥青股份有限公司 | A kind of PG is classified the modified pitch of composite asphalt modifier and its preparation |
| CN107057382A (en) * | 2016-12-31 | 2017-08-18 | 山西省交通科学研究院 | A kind of polymer and montmorillonite modified synergic coal tar pitch and preparation method thereof |
| CN112980205B (en) * | 2021-01-27 | 2022-05-10 | 池州华远新材料有限公司 | High-performance modified asphalt and preparation method thereof |
| CN114015246B (en) * | 2021-10-25 | 2022-08-19 | 河北交规院瑞志交通技术咨询有限公司 | Modified asphalt composite particle and preparation thereof, modified asphalt and application thereof |
| CN114213855B (en) * | 2021-12-27 | 2023-04-18 | 江苏宝利路面材料技术有限公司 | Warm-mix modified rubber asphalt and preparation method thereof |
| CN114508018A (en) * | 2022-03-28 | 2022-05-17 | 河北建设集团卓诚路桥工程有限公司 | Construction method for upper surface layer by using high-mixing-amount rubber powder asphalt concrete |
| CN115057657B (en) * | 2022-06-30 | 2023-03-21 | 烟台市公路事业发展中心 | Ultrathin wearing layer paving method based on high-viscosity emulsified asphalt |
| CN115029011A (en) * | 2022-07-28 | 2022-09-09 | 浙江省交通运输科学研究院 | Epoxy asphalt steel bridge deck pavement pit repairing material and application thereof |
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Effective date of registration: 20190624 Address after: No. 78 Panlongshan Road, Jiangyin City, Wuxi City, Jiangsu Province, 214434 Patentee after: JIANGSU ZHONGHONG ENVIRONMENTAL PROTECTION TECHNOLOGY Co.,Ltd. Address before: 250101 Feng Ming Road, Lingang Development Zone, Licheng District, Ji'nan, Shandong Patentee before: SHANDONG JIANZHU University |
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Denomination of invention: A modified asphalt rubber particle and its preparation method Granted publication date: 20151028 Pledgee: Jiangyin Xinlian Financing Guarantee Co.,Ltd. Pledgor: JIANGSU ZHONGHONG ENVIRONMENTAL PROTECTION TECHNOLOGY Co.,Ltd. Registration number: Y2024980010524 |