CN104016612A - Method for preparing asphalt concrete anti-cracking agent by blending, grafting and modifying - Google Patents
Method for preparing asphalt concrete anti-cracking agent by blending, grafting and modifying Download PDFInfo
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Abstract
The invention relates to a method for preparing asphalt concrete anti-cracking agent by blending, grafting and modifying. Specific steps are as follows: (1), sufficiently mixing 100 parts by weight of polymer, 0.1-5 parts by weight of acid anhydride and 0.1-2 parts by weight of initiator in a high-speed mixer, extruding and pelletizing by a double screw to obtain modified polymer; (2), sufficiently mixing 50-80 parts by weight of modified polymer, 10-30 parts by weight of filler, 10-50 parts by weight of flexibilizer, 0.5-10 parts by weight of tackifier and 0.1-5 parts by weight of antioxidant in a high-speed mixer, then, adding into a double-screw extruder for melting and blending, controlling the temperature at 160-200 DEG C, controlling the rotation speed of the screw at 20-40r/min, extruding and pelletizing to obtain the anti-cracking agent. Compared with the prior art, the method disclosed by the invention is simple in process, low in cost and suitable for industrial production, can be used for omitting an asphalt modifying process link, and is remarkable in economic benefits; the obtained anti-cracking agent can be used for remarkably improving the high-temperature anti-cracking performance and low-temperature anti-cracking performance of the asphalt concrete.
Description
Technical field
The invention belongs to asphalt concrete modifying agent preparing technical field, specifically, relate to a kind of blend graft modification and prepare the method that the anti-rut of bituminous concrete splits agent.
Background technology
Along with the fast development of national economy and transportation, traffic great Liu Liang ﹑ vehicle great Xingization ﹑ heavy duty overload and canalized traffic etc. become distinguishing feature and the inexorable trend of Modern Traffic gradually.The continuing of simultaneous global climate warmed, and it is day by day harsh that road occupation condition becomes.At present, high temperature rut, the cold cracking that road investigator produces asphalt pavement of highway has understanding and mental preparation relatively fully, for this reason, aspect the combination of bituminous texture layer and Bitumen Concrete Mixture Ratio Design, taking a series of measure.But; emphasize simply to improve the anti-rut performance of bituminous pavement; and the cold cracking that may occur for asphalt pavement of highway and water stability not enough (main manifestations is hole groove, loose phenomenon); but be not contemplated to; especially low in average temperature of the whole year, the motorway of long and rainy humid area of sunshine duration, road surface often there will be cracking, pitted skin, loose, fall grain and even cheat cracking and the Moisture Damages such as groove; this noticeable earlier period damage is that people are quite unexpected.The generation of rut disease, cold cracking and Moisture Damage can cause bituminous pavement shortening in work-ing life as can be seen here; make road surface enter in advance maintenance and alteration stage; no matter be heavily to spread cover or enter in advance reconstruction by milling all can cause the huge wasting of resources and investment loss; the former ground surface material that milling is got off also can become huge source of pollution, is unfavorable for environment protection.
For solving the various diseases of bituminous pavement, road investigator constantly, in research prevention and solution, mainly contains two aspects to the improvement of bituminous concrete both at home and abroad.The one, pitch is carried out to modification, by add various polymkeric substance or other inorganic materials in pitch, improve the pavement performance of pitch; The 2nd, to bituminous concrete modification, in the production process of bituminous concrete, mix the anti-rut effect that certain anti-rut agent, fiber improve bituminous concrete.Centered by asphalt modification technical study, most study be physically modified agent, as a series of with polymer modification in SBS ﹑ SBR and SIS etc.; Part company also develops chemical modifier, and modified effect is good, as the ring oxygen of Shell Co. Ltd gathers the He Wu ﹑ Elvaloy of E.I.Du Pont Company product etc.With the research of bituminous concrete modification technology, attach most importance to, developed the various outer special-purpose additives such as properties-correcting agent, Xiang Jiao ﹑ Xian Wei ﹑ Fei old Su Liao ﹑ diatomite as old in Fei and anti-rut agent of mixing.
On market, anti-rut agent product mainly contains DUROFLEX, the SEAM of shell pitch company of German Ba Saier group and PRIPLAST of French PR I company etc.These products are remarkable, easy to use to improving the anti-rut impact of performance of bituminous concrete, but to improving bituminous concrete crack resistance at low-temperature DeGrain, selling price is expensive simultaneously, promotes the use of and is restricted.
Summary of the invention
In order to solve the problems of the technologies described above, to the invention provides a kind of blend graft modification and prepare the method that the anti-rut of bituminous concrete splits agent.The method technique is simple, and cost is lower, be applicable to suitability for industrialized production, and prepared anti-rut splits anti-rut performance and crack resistance at low-temperature that agent can significantly improve bituminous concrete.
The method that the anti-rut of bituminous concrete splits agent is prepared in a kind of blend graft modification, described method concrete steps are: 1) by polymkeric substance 100 mass parts, acid anhydrides 0.1～5 mass parts, initiator 0.1～2 mass parts, in high-speed mixer, fully mix, with double-screw extruding pelletizing, make polymer-modified; 2) by polymer-modified 50～80 mass parts, filler 10～30 mass parts, toughner 10～50 mass parts, tackifier 0.5～10 mass parts, antioxidant 0.1～5 mass parts, in high-speed mixer, fully mix, join again and in twin screw extruder, carry out melt blending, control 160 ℃～200 ℃ of temperature, screw speed 20～40r/min, extruding pelletization, obtains anti-rut and splits agent.
Described step 1) polymkeric substance in is that regenerated polythene class is or/and regenerating polypropylene class.
Described step 1) acid anhydrides in is the carboxylic acid anhydride containing 2-8 carbon atom.
Described step 1) initiator in is one or more in di-isopropyl peroxydicarbonate, dibenzoyl peroxide, dicumyl peroxide, ditertiary butyl peroxide, tert-butyl peroxide, Potassium Persulphate.
Described step 1) in, the processing parameter of twin screw is 140 ℃～180 ℃ of processing temperatures, screw speed 30～50r/min.
Described step 2) filler in is calcium sulfate crystal whiskers, and toughner is one or more in liquid polysulfide rubber, SBS, EVA.
Described step 2) tackifier in are Gum Rosin or petroleum resin.
Described step 2) antioxidant in is water chestnut phenol.
Described step 2) antioxidant in is phenols or phosphorous acid esters.
Adopt above technical scheme, the anti-rut of high-performance bituminous concrete of the present invention splits agent and has following characteristics:
(1) it is controlled that anti-rut splits agent performance.The properties-correcting agent antagonism rut of different addition quantity splits agent system and carries out graft modification, and different formulas forms gives pavement performance and the processing performance that anti-rut splits agent excellence.Initiator gives mixture suitable activity, is convenient to it by graft modification; Toughner is given the toughness that anti-rut splits agent excellence, improves its shock resistance and resistance to cleavage; Tackifier strengthen the bonding force between pitch and concrete, improve the weather resistance of bituminous concrete.
(2) adopt calcium sulfate crystal whiskers as inorganic fibre strongthener, this material be shape be similar to staple fibre and size much smaller than staple fibre must shape single crystal, its diameter is minimum, length-to-diameter ratio is very big, the atomic arrangement structure with high-sequential, almost there is no the defect in common macrocrystal, there is extremely good physicochemical property and excellent mechanical property.Compare with the organic short fiber of common application, the consistency of calcium sulfate crystal whiskers and various mineral fillers is better, dispersed better, substantially there is not dispersed problem, substantially do not affect the serviceability that anti-rut splits agent, in anti-rut splits agent, form a kind of state of even random distribution, structural stress is disperseed, produce secondary stiffening effect, thereby effectively improve anti-resistance to spalling ﹑ ultimate compression strength and the folding strength of bituminous concrete.
(3) there is physical/chemical effect.Anti-rut splits agent and is dissolved in after pitch, between its high molecular polymer main chain, between mutual winding and active group, produce reactive force, form 3 D cross-linked reticulated structure, this 3 D cross-linked reticulated structure wraps on free pitch, limited on the one hand flowing of free pitch, by the active group in active modification group and pitch, produced reactive force on the other hand, thereby form a kind of high-intensity viscoelastic material, the force of cohesion and the viscosity that have improved pitch, reduced its temperature sensitivity.Anti-rut splits in properties-correcting agent active modification group and aggregate surface and is easy to produce and pretends firmly simultaneously, improved the adhesive power of pitch and aggregate, not only between pitch and mineral aggregate, forming polymkeric substance puts up a bridge, and split and between agent, produce physical/chemical effect at pitch and anti-rut, and then significantly strengthen the ability that asphalt is resisted external force deformation, improve the anti-rut performance of compound high temperature and crack resistance at low-temperature.
Compared with prior art, blend graft modification of the present invention is prepared the method that the anti-rut of bituminous concrete splits agent and is had the following advantages: can significantly improve the anti-rut performance of high temperature and the crack resistance at low-temperature of bituminous concrete, extend the work-ing life of bituminous pavement; Take regenerated polymer as main raw material, realized the recycle of resource, improved its use value, environmental benefit is remarkable; Present method technique is simple, and cost is low, is applicable to suitability for industrialized production, has saved the process procedure of asphalt modification, remarkable in economical benefits.
Embodiment
Below in conjunction with specific embodiment, blend graft modification of the present invention is prepared to the method that the anti-rut of bituminous concrete splits agent and be described further, but protection scope of the present invention is not limited to this.
Embodiment 1
(1) take regeneration PE90 mass parts, regeneration PP10 mass parts, MAH1 mass parts, di-tololyl peroxide 0.5 mass parts, in high-speed mixer, fully mix, compound joins in twin screw extruder, at 140 ℃ of barrel temperatures, under the rotating speed of 30r/min, carry out fusion-grafting mixing, extruding pelletization makes polymer-modified.
(2) take polymer-modified 70 mass parts, calcium sulfate crystal whiskers 10 mass parts, SBS10 mass parts, EVA10 mass parts, Gum Rosin 1 mass parts, 2,6-di-t-butyl-4 (dimethyl aminomethyl) phenol 0.5 mass parts, at twin screw, carry out melting mixing, under 160 ℃ of melt blending temperature, screw speed 30r/min, prepare anti-rut and split agent.
Embodiment 2
(1) take regeneration PE80 mass parts, regeneration LDPE20 mass parts, MAH0.5 mass parts, ditertiary butyl peroxide 0.25 mass parts, in high-speed mixer, fully mix, compound joins in twin screw extruder, at 180 ℃ of barrel temperatures, under the rotating speed of 50r/min, carry out fusion-grafting mixing, extruding pelletization makes polymer-modified.
(2) take polymer-modified 50 mass parts, calcium sulfate crystal whiskers 10 mass parts, SBS20 mass parts, EVA20 mass parts, petroleum resin 0.5 mass parts, Tert. Butyl Hydroquinone 1 mass parts, at twin screw, carry out melting mixing, under 200 ℃ of melt blending temperature, screw speed 40r/min, prepare anti-rut and split agent.
Embodiment 3
(1) take regeneration PE70 mass parts, regeneration PP10 mass parts, MAH1.5 mass parts, Tetra hydro Phthalic anhydride 0.5 mass parts, dioxide diisopropylbenzene(DIPB) 1 mass parts, in high-speed mixer, fully mix, compound joins in twin screw extruder, at 160 ℃ of barrel temperatures, under the rotating speed of 40r/min, carry out fusion-grafting mixing, extruding pelletization makes polymer-modified.
(2) take polymer-modified 65 mass parts, calcium sulfate crystal whiskers 10 mass parts, SBS10 mass parts, EVA5 mass parts, liquid polysulfide rubber 10 mass parts, Gum Rosin 0.5 mass parts, petroleum resin 0.5 mass parts, tricresyl phosphite (2,4-di-tert-butyl-phenyl) ester 1 mass parts, at twin screw, carry out melting mixing, under 180 ℃ of melt blending temperature, screw speed 30r/min, prepare anti-rut and split agent.
Embodiment 4
(1) take regeneration PE70 mass parts, regeneration HDPE10 mass parts, regeneration LDPE10 mass parts, regeneration PP10 mass parts, MAH1 mass parts, tert-butyl peroxide 0.5 mass parts, in high-speed mixer, fully mix, compound joins in twin screw extruder, at 140 ℃ of barrel temperatures, under the rotating speed of 40r/min, carry out fusion-grafting mixing, extruding pelletization makes polymer-modified.
(2) take polymer-modified 80 mass parts, calcium sulfate crystal whiskers 5 mass parts, EVA10 mass parts, liquid polysulfide rubber 5 mass parts, Gum Rosin 1 mass parts, distearyl pentaerythritol bis-phosphite 1 mass parts, at twin screw, carry out melting mixing, under 160 ℃ of melt blending temperature, screw speed 30r/min, prepare anti-rut and split agent.
Embodiment 5
(1) take regeneration PE60 mass parts, regeneration HDPE30 mass parts, regeneration LLDPE10 mass parts, MAH0.8 mass parts, Potassium Persulphate 0.4 mass parts, in high-speed mixer, fully mix, compound joins in twin screw extruder, at 180 ℃ of barrel temperatures, under the rotating speed of 50r/min, carry out fusion-grafting mixing, extruding pelletization makes polymer-modified.
(2) take polymer-modified 70 mass parts, calcium sulfate crystal whiskers 10 mass parts, EVA5 mass parts, SBS5 mass parts, liquid polysulfide rubber 10 mass parts, petroleum resin 1 mass parts, tricresyl phosphite (2,4-di-tert-butyl-phenyl) ester 0.5 mass parts, at twin screw, carry out melting mixing, under 200 ℃ of melt blending temperature, screw speed 20r/min, prepare anti-rut and split agent.
Embodiment 6
(1) take regeneration PE50 mass parts, regeneration PP10 mass parts, regeneration HDPE20 mass parts, regeneration LDPE20 mass parts, Tetra hydro Phthalic anhydride 1 mass parts, di-isopropyl peroxydicarbonate 0.5 mass parts, in high-speed mixer, fully mix, compound joins in twin screw extruder, at 140 ℃ of barrel temperatures, under the rotating speed of 30r/min, carry out fusion-grafting mixing, extruding pelletization makes polymer-modified.
(2) take polymer-modified 70 mass parts, calcium sulfate crystal whiskers 5 mass parts, liquid polysulfide rubber 5 mass parts, SBS20 mass parts, Gum Rosin 0.5 mass parts, distearyl pentaerythritol bis-phosphite 0.5 mass parts, tricresyl phosphite (2,4-di-tert-butyl-phenyl) ester 0.5 mass parts, at twin screw, carry out melting mixing, under 200 ℃ of melt blending temperature, screw speed 40r/min, prepare anti-rut and split agent.
Embodiment 7
(1) take regeneration PE50 mass parts, regeneration PP10 mass parts, regeneration HDPE20 mass parts, regeneration LDPE20 mass parts, Tetra hydro Phthalic anhydride 1 mass parts, di-isopropyl peroxydicarbonate 0.5 mass parts, in high-speed mixer, fully mix, compound joins in twin screw extruder, at 140 ℃ of barrel temperatures, under the rotating speed of 30r/min, carry out fusion-grafting mixing, extruding pelletization makes polymer-modified.
(2) take polymer-modified 70 mass parts, calcium sulfate crystal whiskers 5 mass parts, liquid polysulfide rubber 5 mass parts, SBS20 mass parts, Gum Rosin 0.5 mass parts, water chestnut phenol 1 mass parts, at twin screw, carry out melting mixing, under 200 ℃ of melt blending temperature, screw speed 40r/min, prepare anti-rut and split agent.
By China < < highway engineering pitch and Asphalt Mixture Experiment rules > > (JTJ052-2000) standard, volume is that the of the present invention anti-rut of asphalt concrete quality 3 ‰ splits after agent, and the high temperature performance of prepared bituminous concrete test specimen improves obviously.The anti-rut that embodiment 1-7 prepares splits agent test result in Table 1.
Table 1: bituminous concrete dynamic stability, flexural-tensile strain test result
As shown in Table 1, the anti-rut that the method for the invention prepares splits the anti-rut performance of high temperature and the crack resistance at low-temperature that agent all can improve bituminous concrete.Especially, after adopting water chestnut phenol as antioxidant, the indexs such as the dynamic stability of bituminous concrete and flexural-tensile strain all significantly promote.Research is found, water chestnut phenol can react with polymer-modified when melting, produce viscosity very large and there is the polymkeric substance of certain molecule gap, thereby make bituminous concrete enter molecule gap, be difficult for temperature influence, finally improve the anti-rut performance of high temperature and the crack resistance at low-temperature of bituminous concrete.Compared with prior art, road bitumen agent on crack resistance of concrete rut of the present invention splits agent preparation method and has the following advantages: can significantly improve the anti-rut performance of high temperature and the crack resistance at low-temperature of bituminous concrete, extend the work-ing life of bituminous pavement; Take regenerated polymer as main raw material, realized the recycle of resource, improved its use value, environmental benefit is remarkable; Present method technique is simple, and cost is low, is applicable to suitability for industrialized production, has saved the process procedure of asphalt modification, remarkable in economical benefits.
Claims (9)
1. the method that the anti-rut of bituminous concrete splits agent is prepared in a blend graft modification, it is characterized in that, described method concrete steps are: 1) by polymkeric substance 100 mass parts, acid anhydrides 0.1～5 mass parts, initiator 0.1～2 mass parts, in high-speed mixer, fully mix, with double-screw extruding pelletizing, make polymer-modified; 2) by polymer-modified 50～80 mass parts, filler 10～30 mass parts, toughner 10～50 mass parts, tackifier 0.5～10 mass parts, antioxidant 0.1～5 mass parts, in high-speed mixer, fully mix, join again and in twin screw extruder, carry out melt blending, control 160 ℃～200 ℃ of temperature, screw speed 20～40r/min, extruding pelletization, obtains anti-rut and splits agent.
2. method according to claim 1, is characterized in that, described step 1) in polymkeric substance be that regenerated polythene class is or/and regenerating polypropylene class.
3. method according to claim 1, is characterized in that, described step 1) in acid anhydrides for containing the carboxylic acid anhydride of 2-8 carbon atom.
4. method according to claim 1, it is characterized in that described step 1) in initiator be one or more in di-isopropyl peroxydicarbonate, dibenzoyl peroxide, dicumyl peroxide, ditertiary butyl peroxide, tert-butyl peroxide, Potassium Persulphate.
5. method according to claim 1, is characterized in that, described step 1) in the processing parameter of double-screw extruding pelletizing be 140 ℃～180 ℃ of processing temperatures, screw speed 30～50r/min.
6. method according to claim 1, is characterized in that, described step 2) in filler be calcium sulfate crystal whiskers; Toughner is one or more in liquid polysulfide rubber, SBS, EVA.
7. method according to claim 1, is characterized in that, described step 2) in tackifier be Gum Rosin or petroleum resin.
8. method according to claim 1, is characterized in that, described step 2) in antioxidant be phenols or phosphorous acid esters.
9. method according to claim 1, is characterized in that, described step 2) in antioxidant be water chestnut phenol.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104559257A (en) * | 2015-01-07 | 2015-04-29 | 山西省交通科学研究院 | High-modulus asphalt particle for road building and preparation method thereof |
| CN105130256A (en) * | 2015-08-14 | 2015-12-09 | 山西省交通科学研究院 | Energy saving and consumption reduction asphalt concrete modifier and preparation method thereof |
| CN106565132A (en) * | 2016-10-23 | 2017-04-19 | 徐旭辉 | High-temperature resistance concrete annexing agent containing microcrystalline wax |
| JP2019501249A (en) * | 2015-12-08 | 2019-01-17 | アクゾ ノーベル ケミカルズ インターナショナル ベスローテン フエンノートシャップＡｋｚｏ Ｎｏｂｅｌ Ｃｈｅｍｉｃａｌｓ Ｉｎｔｅｒｎａｔｉｏｎａｌ Ｂ．Ｖ． | Method for reducing fogging from high melt strength polypropylene |
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| CN103788667A (en) * | 2013-12-25 | 2014-05-14 | 上海浦东路桥建设股份有限公司 | Multicomponent system for improving modulus of asphalt mixture, and application method and modified asphalt thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104559257A (en) * | 2015-01-07 | 2015-04-29 | 山西省交通科学研究院 | High-modulus asphalt particle for road building and preparation method thereof |
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| JP2019501249A (en) * | 2015-12-08 | 2019-01-17 | アクゾ ノーベル ケミカルズ インターナショナル ベスローテン フエンノートシャップＡｋｚｏ Ｎｏｂｅｌ Ｃｈｅｍｉｃａｌｓ Ｉｎｔｅｒｎａｔｉｏｎａｌ Ｂ．Ｖ． | Method for reducing fogging from high melt strength polypropylene |
| CN106565132A (en) * | 2016-10-23 | 2017-04-19 | 徐旭辉 | High-temperature resistance concrete annexing agent containing microcrystalline wax |
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| CN104016612B (en) | 2016-06-29 |
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