CN108047735B - Low rolling resistance modified asphalt and preparation method thereof - Google Patents
Low rolling resistance modified asphalt and preparation method thereof Download PDFInfo
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Abstract
The invention relates to a low rolling resistance modified asphalt and a preparation method thereof; the modified asphalt comprises a binder, an elastomer blend, a multi-walled carbon nanotube, a high polymer material internal lubricant, a rubber cross-linking agent and a stannous chloride vulcanization aid. The preparation method comprises the following steps: 1) firstly, crushing solution polymerized styrene-butadiene rubber into coarse particles, mixing the coarse particles with a thermoplastic elastomer in equal proportion, uniformly stirring, and crushing the uniform mixture to obtain a subdivided polymer elastomer; 2) mixing the finely-divided polymer elastomer, the hydroxyl multi-walled carbon nanotube and the macromolecular lubricant in the step 1) in proportion, and then uniformly stirring at a high speed to obtain the low-loss factor asphalt modifier; 3) heating the binder to a certain temperature, adding the low-loss factor asphalt modifier obtained in the step 2), grinding until no particles exist, adding the cross-linking agent and the vulcanization aid in equal proportion, and stirring to obtain the modified asphalt. The invention greatly improves the low rolling resistance of the asphalt under the condition of ensuring high complex modulus.
Description
Technical Field
The invention relates to the technical field of building energy-saving materials, in particular to low rolling resistance modified asphalt and a preparation method thereof.
Background
With the development of high-grade highway construction, the total mileage of the expressway in China reaches 13.5 kilometers by the end of 2016 and is the top of the world. Various polymer modified asphalts are generally applied, the road performance of asphalt pavements is greatly improved, but the researches on the asphalt pavements which are energy-saving, emission-reducing, green and long-life in operation are few. According to the national traffic development strategy of energy conservation, environmental protection, low carbon and environmental protection and the improvement of people's consciousness on energy conservation and environmental protection, more functional requirements are put forward on new road surface materials, such as the expectations of the problems of fuel consumption of running vehicles, the pollution problem of automobile tail gas, the running noise of vehicles, the durability of asphalt pavements and the like are higher and higher.
In addition, the running of the last two decades shows that rutting becomes a main disease of the expressway, accounts for more than 70% of the disease, is very related to the molecular structure of the modified asphalt besides the pavement structure, and under the action of repeated load, the interior of the modified asphalt generates heat dynamically, so that the elastic modulus of the asphalt material is reduced, the loss modulus is increased, the asphalt is changed from elasticity to viscosity, the flowing deformation is easy to generate, aggregate particles are displaced, the permanent deformation is formed, and the rutting disease is generated on the asphalt pavement.
Based on the problems, the low rolling resistance modified asphalt material with low loss factors can be prepared by modifying the asphalt material, and the asphalt pavement with energy conservation, emission reduction, low carbon, green performance and long service life and anti-rutting performance is a major subject in front of traffic managers and construction maintainers.
The rolling resistance of the automobile tire, also called the rolling loss of the tire, is proved by professional tests that when the automobile runs at a constant speed of 100Km/h, the resistance mainly comprises air resistance, mechanical friction resistance of internal components and rolling resistance of the tire, the proportion of the air resistance, the mechanical friction resistance of the internal components and the rolling resistance of the tire is 60%, 15% and 25%, and one fourth of the oil consumption of the automobile is used for overcoming the rolling resistance. The data show that 3.4-6.6% of fuel consumption of a car or a light truck is used for overcoming rolling resistance in the driving process of the car, 12.4-14.5% of fuel consumption of the heavy truck is used for overcoming rolling resistance, the rolling resistance of the car is reduced by 10%, the light car saves 1.2-1.5% of fuel, and the heavy truck saves 4.0-5.0% of fuel. If a 4-kilometre low rolling resistance highway is paved by the modified asphalt with the low loss factor in an economically developed area, the daily average traffic flow is calculated according to 3-kilometre vehicle times, the oil consumption is calculated according to 10 kilograms/100 kilometres, the highway operation is calculated according to 300 days/year, and the fuel oil is saved by 4%, about 180-kiloton gasoline and diesel oil can be saved each year, which is equivalent to the crude oil yield of a 500-kiloton oil field, and about 430-kiloton emission of greenhouse gas carbon dioxide can be reduced, so that the method is a very effective energy-saving and emission-reduction measure, and the green operation of the highway is realized.
The rolling friction resistance of a running vehicle is the work consumed by the moment generated by the deformation of tires and the deformation of the road surface. The modified asphalt with low loss factor can effectively reduce the rolling friction resistance of the asphalt pavement and pave the low rolling resistance asphalt pavement to realize the purposes of energy conservation and emission reduction of running vehicles, and meanwhile, the loss factor of the modified asphalt is small, the dynamic heat generation of the asphalt pavement is reduced, the pavement has better high-temperature stability and durability, and the purpose of prolonging the service life is achieved. Therefore, the low rolling resistance asphalt pavement material with low loss factors is researched and developed for highway pavements, and the low rolling resistance asphalt pavement material has very important practical significance for reducing automobile fuel consumption and tail gas emission, reducing track diseases and prolonging the service life of roads.
At present, in the rubber tire industry in developed countries in Europe and America, the research on manufacturing materials and manufacturing technology of low rolling resistance tires are mature based on viscoelastic mechanics, and the tire manufacturing method and manufacturing technology are provided with perfect evaluation methods and manufacturing technologies, and as early as 20 years of the last century, some tire manufacturers in Europe and America begin to research and manufacture green and environment-friendly low rolling resistance tires, such as Michelin company, Prostiong company, LG chemical company, Japan synthetic rubber company, Sumitomo and other companies respectively modify SSBR (styrene butadiene rubber) by different processes, so that the hysteresis of the rubber is mostly changed or reduced, and the rubber with low dynamic heat generation is obtained, so that the low rolling resistance tires are manufactured. A multifunctional initiator for anionic polymer is developed by Yaoming of Beijing chemical university, and is used for adjusting the SSBR functionality of solution polymerized styrene-butadiene rubber and reducing the hysteresis of the rubber to prepare the low rolling resistance tire. The tin-coupled multi-lithium initiator disclosed by Zhang Xingying and the like modifies star SSBR, reduces the loss factor of rubber, reduces the dynamic heat generation of the rubber, and is used for producing low rolling resistance tires.
Various modified asphalts adopted by the existing expressway, such as SBS modified asphalt, SBR modified asphalt, high modulus PE modified asphalt, rubber tire powder modified asphalt and other materials, are researched and counted by related research detection mechanisms such as China Petroleum university (east China) heavy oil institute, Shandong building university road engineering laboratory and the like aiming at about thirty thousand groups of data of the SHRP test of the rheological property of the modified asphalt, and the result table A shows that:
table A asphalt and modified asphalt SHRP test data statistics
As can be seen from Table A, although the complex modulus of each of the modified asphalts is higher than that of the base asphalt, the phase angle of these modified asphalts does not vary much, and is between 60 and 80 degrees. Even though the complex modulus of the high-modulus modified asphalt is greatly improved and has good anti-rutting capability, the phase angle is still between 60 and 80 degrees, which shows that the ratio of the viscous modulus to the elastic modulus is large, the loss factor is large, the dynamic heat generation is high, the energy consumption of running vehicles is high according to the law of energy conservation, in addition, the dynamic heat generation of the modified asphalt is high, under the action of repeated load, the temperature rise in the asphalt pavement is easy to generate flow deformation, and aggregate particles are displaced to form permanent deformation to generate rutting diseases.
In summary, the conventional modified asphalt still has many problems and needs to be further improved, and therefore, it is necessary to search, research and develop a new modified asphalt.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a low rolling resistance modified asphalt and a preparation method thereof. The complex modulus G of the low rolling resistance modified asphalt prepared by optimizing the modifier and the auxiliary agent and adopting a chemical means*The phase angle delta is reduced from 60-80 degrees to 40-48 degrees, the loss factor (tan delta) is reduced by 50 percent, and the low rolling resistance of the asphalt is greatly improved under the condition of ensuring high complex modulus.
One of the purposes of the invention is to provide a low rolling resistance modified asphalt.
The invention also aims to provide a preparation method of the low rolling resistance modified asphalt.
The invention also aims to provide the low rolling resistance modified asphalt and the application of the preparation method thereof.
In order to realize the purpose, the invention discloses the following technical scheme:
the invention discloses low rolling resistance modified asphalt, which comprises the following components in parts by weight: 80-90 parts of binder, 3.92-10.34 parts of elastomer blend, 0.16-1.32 parts of multi-walled carbon nano tube, 3.92-10.34 parts of high polymer material internal lubricant, 1.0-3.0 parts of rubber cross-linking agent and 1.0-3.0 parts of stannous chloride vulcanization aid.
In the low rolling resistance modified asphalt, the binder is 70# petroleum asphalt. It should be noted that the binder of the present invention can only be replaced by petroleum pitch, but not coal pitch, because coal pitch is inferior at low temperature and has poor temperature sensitivity. In addition, the petroleum asphalt is a main material in the preparation process of the low rolling resistance modified asphalt, the dosage of the petroleum asphalt is not easy to be excessive, too much influences the reduction range of the low loss factor tan delta, too little influences the bonding property and the road performance of the modified asphalt, and can cause the preparation cost of the modified asphalt to be overhigh.
In the low rolling resistance modified asphalt, the elastomer blend is as follows: styrene-butadiene polymer-based elastomers. Because the elastomer blend is the main component for improving the pavement performance of the modified asphalt, the high-temperature performance, the water damage resistance and the low-temperature performance of the modified asphalt mixture can be improved. However, the loss factor tan δ is not easily excessive, but can be reduced to a small extent if the loss factor tan δ is too much, the viscosity of the modified asphalt is increased, the workability of construction is poor, the cost is increased, the modulus of the modified asphalt is insufficient if the loss factor tan δ is too little, the anti-rutting performance is reduced, and the road performance of the modified asphalt is affected.
Preferably, the elastomer blend comprises: any two of solution polymerized styrene butadiene rubber (SSBR), butyl rubber (IIR), thermoplastic elastomers, and the like.
More preferably, the elastomer blend is a mixture of solution polymerized styrene-butadiene rubber and a star-shaped SBS thermoplastic elastomer. The star-shaped SBS thermoplastic elastomer has better mechanical property than a linear SBS thermoplastic elastomer, has more branches, is easy to reinforce, limits free swing of molecules, and reduces dynamic heat generation and energy consumption.
In the low rolling resistance modified asphalt, the multiwall carbon nanotube is preferably a hydroxyl multiwall carbon nanotube, because the hydroxyl has larger polarity, the multiwall carbon nanotube is more easily attached to a thermoplastic rubber molecular chain, the free swing of the molecular chain is limited or fixed, the heat generated by the molecular swing is reduced, the dynamic heat generation of the modified asphalt is reduced, and the loss factor of the modified asphalt material is reduced.
Preferably, the multi-walled carbon nanotubes have a length of no more than 50nm, and the larger the aspect ratio the better.
Preferably, the aspect ratio of the multi-walled carbon nanotubes is up to 50, due to production technology limitations, which currently can only be in this range.
In the low rolling resistance modified asphalt, the high polymer material internal lubricant comprises fatty acid amide substances. The internal lubricant of the high polymer material mainly plays a role in dispersion and lubrication, and mainly plays a role in: (1) the hydroxyl multi-walled carbon nanotubes can be uniformly dispersed and attached to the molecular chain of the high polymer rubber as much as possible, and the hydroxyl multi-walled carbon nanotubes are prevented from being agglomerated to influence the dispersion efficiency; (2) the molecular sliding of the thermoplastic rubber can be lubricated, and the molecular sliding friction resistance is reduced, so that the heat generated by the sliding friction in rubber molecules is reduced, and the low-dynamic heat generation modified asphalt is obtained; (3) the low-temperature viscosity of the asphalt can be increased, the modulus of the asphalt mixture is improved, and the anti-rutting capability is improved.
Preferably, the polymer material internal lubricant is: one or two of stearic acid amide (SR) and Ethylene Bis Stearamide (EBS).
In the low rolling resistance modified asphalt, a rubber cross-linking agent is environment-friendly sulfur-free tert-butyl phenol aldehyde vulcanized resin. It should be noted that: the rubber cross-linking agent and the stannous chloride vulcanizing aid are mixed in equal proportion to form the rubber vulcanizing agent, so that the effects of easing vulcanization and avoiding gelation can be achieved, and the prepared modified asphalt has the excellent performances of small deformation, good heat resistance, high tensile strength, small elongation and the like, and has a good promotion effect on reducing loss factors of the modified asphalt.
Secondly, the invention discloses a preparation method of the low rolling resistance modified asphalt; specifically, the preparation method comprises the following steps:
1) firstly, crushing solution polymerized styrene butadiene rubber into coarse particles, mixing the coarse particles with a thermoplastic elastomer according to the same weight part, uniformly stirring, and then crushing the uniform mixture to obtain the subdivided polymer elastomer.
2) Mixing the finely-divided polymer elastomer, the hydroxyl multi-walled carbon nanotube and the macromolecular lubricant in the step 1) in proportion, and then uniformly stirring at a high speed to obtain the low-loss factor asphalt modifier.
3) Preparing low-loss factor modified asphalt: heating the adhesive to a certain temperature in a reaction kettle, adding the low-loss factor asphalt modifier obtained in the step 2), grinding until no particles exist, adding the cross-linking agent and the vulcanization aid in equal proportion, and stirring to obtain the low rolling resistance modified asphalt.
In the step 1), the diameter of the coarse particles is 3-5 mm.
In step 1), the size of the finely divided polymeric elastomer is 50 to 100 mesh.
In the step 2), the weight parts of the subdivided polymer elastomer, the hydroxyl multi-walled carbon nanotube and the macromolecular lubricant are (47-49): (2-6): (47-49).
In the step 2), the stirring time is 3-5 minutes, and the stirring speed is as follows: 3000 to 4000 r/min.
In the step 3), the content of the binder is 80-90 parts by weight.
In the step 3), the heating temperature is as follows: 180 ℃ and 185 ℃.
In the step 3), the content of the low-loss-factor asphalt modifier is 8-12 parts by weight.
In the step 3), the content of the cross-linking agent and the vulcanizing assistant is 1-3 parts by weight.
In the step 3), the grinding refers to grinding for 20-40 min by using a colloid mill or a shearing machine.
Preferably, the milling is carried out for 30min with a colloid mill or a shearing machine.
In the step 3), the stirring time is 0.5-1.5 h.
Preferably, the stirring time is 1 h.
Finally, the invention discloses a preparation method of the low rolling resistance modified asphalt and application of the preparation method, wherein the application comprises the application in high-grade highway construction, airport runway construction, parking lot construction, bridge construction and asphalt modification.
It should be noted that: at present, the research on the low rolling resistance modified asphalt in the prior art at home and abroad is not researched, and the concept of introducing the low rolling resistance into the modified asphalt is not reported; the concept of low rolling resistance is introduced into the design of asphalt pavement materials and pavement structures for the first time, the loss factor tan delta is used as a basis for judging the change of the rolling resistance of the modified asphalt material, and the low rolling resistance of the conventional modified asphalt is reduced by 50 percent at most by redesigning and optimizing the modifier, the auxiliary agent and other components, so that the method has very important significance for reducing the energy consumption of running vehicles, reducing the tail gas emission, improving the driving environment of tunnels, reducing the rutting diseases of the pavement and prolonging the service life of the pavement.
In addition, the low rolling resistance asphalt has the measurement standard of low loss factor (tan delta), namely, the phase angle delta is relatively small under the condition of high complex modulus, and the asphalt has the performance by adopting a physical and chemical method to carry out molecular isomerization on the asphalt, namely, the low rolling resistance asphalt is obtained.
Compared with the prior art, the invention has the following beneficial effects:
(1) the invention prepares the low rolling resistance modified asphalt by optimizing the modified material and the processing technique and adopting the combined action of chemical means, the modified asphalt keeps higher complex modulus and viscoelasticity performance, and the phase angle is from 60-80 degrees to 40-48 degrees, the maximum reduction amplitude reaches 50 percent, and the low rolling resistance performance of the existing asphalt is greatly improved.
(2) The low rolling resistance modified asphalt can be used for paving low rolling resistance asphalt pavements, the fuel consumption of running automobiles is reduced, dynamic heat generation in the modified asphalt can be reduced under the action of repeated load, the influence factors of track diseases on the asphalt pavements are reduced, and the service life of roads is prolonged.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The invention uses DSR dynamic rheometer to detect the phase angle delta of the low rolling resistance modified asphalt.
As mentioned in the background art, the existing modified asphalt still has many problems in the aspects of performance and the like, so the invention provides a low rolling resistance modified asphalt and a preparation method thereof, and the invention is further described with reference to specific embodiments.
Example 1:
a preparation method of low rolling resistance modified asphalt comprises the following steps:
1) firstly, crushing solution polymerized styrene-butadiene rubber into coarse particles with the particle size of 5mm by a rubber crusher, mixing the coarse particles with the star-shaped SBS thermoplastic elastomer according to the proportion of 50 parts by weight, stirring the mixture evenly, and then crushing the even mixture to 80 meshes by a crusher to obtain the subdivided polymer elastomer.
2) Mixing the finely-divided polymer elastomer in the step 1), the hydroxyl multi-walled carbon nanotube (with the length of 50nm and the length-diameter ratio of 50) and the stearamide according to the proportion of 47 parts, 6 parts and 47 parts, and stirring for 4 minutes in a high-acceleration stirrer with the stirring speed of 3500r/min to obtain the low-loss factor asphalt modifier.
3) Preparing low-loss factor modified asphalt: heating 80 parts of No. 70 petroleum asphalt to 185 ℃ in a reaction kettle, adding 12 parts of the low-loss factor asphalt modifier in the step 2), grinding for 20 minutes by a colloid mill until no particles exist, adding 3.0 parts of tert-butyl phenolic sulfide resin and 3.0 parts of stannous chloride, and stirring for 1 hour to obtain the low rolling resistance modified asphalt.
The low rolling resistance modified asphalt prepared by the embodiment comprises the following components in parts by weight: 80 parts of No. 70 petroleum asphalt, 5.64 parts of elastomer blend (solution polymerized styrene-butadiene rubber SSBR and star SBS thermoplastic elastomer), 0.72 part of multi-wall carbon nano tube, 5.64 parts of stearic acid amide, 3.0 parts of tert-butyl phenol aldehyde vulcanized resin and 3.0 parts of stannous chloride vulcanization aid.
The technical indexes of the low rolling resistance modified asphalt obtained in the example are tested, and the results are shown in table 1.
TABLE 1 technical indices of modified asphalts with low loss factors
As can be seen from Table 1, all the specifications of the modified asphalt prepared in this example meet the specification, wherein the complex modulus G*The increase amplitude is large, 12410Pa is achieved, the phase angle delta reaches the design target, and the loss factor tan delta is reduced by 27-45% compared with the conventional modified asphalt (the phase angle is 60-80 degrees), which shows that the modified asphalt prepared by the embodiment has good low rolling resistance.
Example 2:
a preparation method of low rolling resistance modified asphalt comprises the following steps:
1) firstly, crushing solution polymerized styrene-butadiene rubber into coarse particles with the particle size of 3mm by a rubber crusher, mixing the coarse particles with the star-shaped SBS thermoplastic elastomer according to the proportion of 50 parts by weight, stirring the mixture evenly, and then crushing the even mixture to 50 meshes by a crusher to obtain the subdivided polymer elastomer.
2) The preparation method comprises the following steps of (1) mixing the finely-divided polymer elastomer, hydroxyl multi-walled carbon nanotubes (with the length of 30nm and the length-diameter ratio of 30) and ethylene bis stearamide in percentage by mass: 4 parts of: mixing 48 parts of the components in proportion, and stirring the mixture in a high-acceleration stirrer with the stirring speed of 3000r/min for 5 minutes to obtain the low-loss factor asphalt modifier.
3) Preparing low-loss factor modified asphalt: heating 85 parts of No. 70 petroleum asphalt to 180 ℃ in a reaction kettle, adding 11 parts by weight of the low-loss factor asphalt modifier in the step 2), grinding for 25 minutes by a colloid mill until no particles exist, adding 2.0 parts of tert-butylphenol aldehyde vulcanized resin and 2.0 parts of stannous chloride, and stirring for 0.5 hour to obtain the low rolling resistance modified asphalt.
The low rolling resistance modified asphalt prepared by the embodiment comprises the following components in parts by weight: 85 parts of No. 70 petroleum asphalt, 5.28 parts of elastomer blend (solution polymerized styrene-butadiene rubber SSBR and star SBS thermoplastic elastomer), 0.44 part of multi-wall carbon nano tube, 5.28 parts of ethylene bis stearamide, 2.0 parts of tert-butyl phenolic vulcanized resin and 2.0 parts of stannous chloride vulcanization aid.
The technical indexes of the low rolling resistance modified asphalt obtained in the example are tested, and the results are shown in table 2.
TABLE 2 technical indices of modified asphalt with low loss factor
As can be seen from Table 2, all the specifications of the modified asphalt prepared in this example meet the specification, wherein the complex modulus G*The pressure-sensitive adhesive achieves 10220Pa, the phase angle delta is 40 degrees, and the loss factor tan delta is reduced by 33.3-50 percent compared with the conventional modified asphalt (the phase angle is 60-80 degrees), which shows that the modified asphalt prepared by the embodiment has good low rolling resistance.
Example 3:
a preparation method of low rolling resistance modified asphalt comprises the following steps:
1) firstly, crushing the SSBR into coarse particles with the particle size of 4mm by a rubber crusher, mixing the coarse particles with the SBS thermoplastic elastomer in a proportion of 60 parts by weight, stirring the mixture uniformly, and then crushing the uniform mixture to 100 meshes by a crusher to obtain the subdivided polymer elastomer.
2) The method comprises the following steps of (1) preparing 49 parts of a finely-divided polymer elastomer, hydroxyl multi-walled carbon nanotubes (with the length of 50nm and the length-diameter ratio of 50) and a high-molecular lubricant (a mixture of stearic acid amide and ethylene bis-stearamide): 2 parts of: 49 parts of the asphalt modifier are mixed and stirred for 5 minutes in a high-acceleration stirrer with the stirring speed of 4000r/min to obtain the low-loss factor asphalt modifier.
3) Preparing low-loss factor modified asphalt: heating 90 parts of No. 70 petroleum asphalt to 183 ℃ in a reaction kettle, adding 8 parts by weight of the low-loss factor asphalt modifier in the step 2), grinding for 30 minutes by a colloid mill until no particles exist, adding 1.0 part of tert-butylphenol aldehyde vulcanized resin and 1.0 part of stannous chloride, and stirring for 1.5 hours to obtain the low rolling resistance modified asphalt.
The low rolling resistance modified asphalt prepared by the embodiment comprises the following components in parts by weight: 90 parts of No. 70 petroleum asphalt, 3.92 parts of elastomer blend (solution polymerized styrene-butadiene rubber SSBR and star SBS thermoplastic elastomer), 0.16 part of multi-wall carbon nano tube, 3.92 parts of high molecular lubricant (a mixture of stearic acid amide and ethylene bis stearamide), 1.0 part of tert-butyl phenol aldehyde vulcanized resin and 1.0 part of stannous chloride vulcanization aid.
The technical indexes of the low rolling resistance modified asphalt obtained in the example are tested, and the results are shown in table 3.
TABLE 3 modified asphalt technical index with low loss factor
As can be seen from Table 3, all the specifications of the modified asphalt prepared in this example meet the specification, wherein the complex modulus G*The pressure reaches 8350Pa, the phase angle delta is 48 degrees, and the loss factor tan delta is reduced by 20-40 percent compared with the conventional modified asphalt (the phase angle is 60-80 degrees), which shows that the modified asphalt prepared by the embodiment has good low rolling resistance.
Example 4:
a preparation method of low rolling resistance modified asphalt comprises the following steps:
1) firstly, crushing SSBR (styrene butadiene rubber) into 5mm coarse particles by a rubber crusher, mixing the SSBR with 50 parts by weight of butyl rubber, uniformly stirring, and crushing the uniform mixture to 80 meshes by a crusher to obtain the finely-divided polymer elastomer.
2) The method comprises the following steps of 1), mixing 47 parts by weight of a finely-divided polymer elastomer, a hydroxyl multi-walled carbon nanotube (with the length of 50nm and the length-diameter ratio of 20) and a macromolecular lubricant in the step 1): 6 parts of: 47 parts of the asphalt modifier are mixed and stirred for 4 minutes in a high-acceleration stirrer with the stirring speed of 3800r/min to obtain the low-loss factor asphalt modifier.
3) Preparing low-loss factor modified asphalt: heating 80 parts of No. 70 petroleum asphalt to 185 ℃ in a reaction kettle, adding 22 parts by weight of the low-loss factor asphalt modifier in the step 2), grinding for 20 minutes by a colloid mill until no particles exist, adding 3.0 parts of tert-butylphenol aldehyde vulcanized resin and 3.0 parts of stannous chloride, and stirring for 1 hour to obtain the low rolling resistance modified asphalt.
The low rolling resistance modified asphalt prepared by the embodiment comprises the following components in parts by weight: 85 parts of No. 70 petroleum asphalt, 10.34 parts of elastomer blend (solution polymerized styrene-butadiene rubber SSBR and star SBS thermoplastic elastomer), 1.32 parts of multi-wall carbon nano tube, 510.34 parts of ethylene bis stearamide, 2.0 parts of tert-butyl phenol aldehyde vulcanized resin and 2.0 parts of stannous chloride vulcanization aid.
Example 5:
a preparation method of low rolling resistance modified asphalt comprises the following steps:
1) firstly, crushing the SSBR into coarse particles of 3mm by a rubber crusher, mixing the coarse particles with the SBS thermoplastic elastomer in a ratio of 40 parts by weight, uniformly stirring, and then crushing the uniform mixture to 50 meshes by a crusher to obtain the subdivided polymer elastomer.
2) The method comprises the following steps of (1) mixing the finely-divided polymer elastomer, hydroxyl multi-walled carbon nanotubes (with the length of 30nm and the length-diameter ratio of 30) and ethylene bis stearamide in parts by weight: 4 parts of: mixing 48 parts of the components in proportion, and stirring the mixture in a high-acceleration stirrer with the stirring speed of 3000r/min for 5 minutes to obtain the low-loss factor asphalt modifier.
3) Preparing low-loss factor modified asphalt: heating 85 parts of No. 70 petroleum asphalt to 180 ℃ in a reaction kettle, adding 15 parts by weight of the low-loss factor asphalt modifier in the step 2), grinding for 40 minutes by a colloid mill until no particles exist, adding 2.0 parts of tert-butylphenol aldehyde vulcanized resin and 2.0 parts of stannous chloride, and stirring for 0.5 hour to obtain the low rolling resistance modified asphalt.
The low rolling resistance modified asphalt prepared by the embodiment comprises the following components in parts by weight: 85 parts of No. 70 petroleum asphalt, 7.2 parts of elastomer blend (solution polymerized styrene-butadiene rubber SSBR and star SBS thermoplastic elastomer), 0.6 part of multi-wall carbon nano tube, 7.2 parts of ethylene bis stearamide, 2.0 parts of tert-butyl phenolic vulcanized resin and 2.0 parts of stannous chloride vulcanization aid.
Example 6:
a preparation method of low rolling resistance modified asphalt comprises the following steps:
1) firstly, butyl rubber is crushed to coarse particles of 3mm by a rubber crusher, the coarse particles and star-shaped SBS thermoplastic elastomer are mixed according to the proportion of 50 parts by weight respectively, the mixture is stirred uniformly, and then the uniform mixture is crushed to 50 meshes by a crusher to obtain the subdivided polymer elastomer.
2) The method comprises the following steps of (1) mixing the finely-divided polymer elastomer, hydroxyl multi-walled carbon nanotubes (with the length of 30nm and the length-diameter ratio of 30) and ethylene bis stearamide in parts by weight: 4 parts of: and mixing 48 parts, and stirring in a high-acceleration stirrer with the stirring speed of 4000r/min for 5 minutes to obtain the low-loss factor asphalt modifier.
3) Preparing low-loss factor modified asphalt: heating 85 parts of No. 70 petroleum asphalt to 180 ℃ in a reaction kettle, adding 18 parts by weight of the low-loss factor asphalt modifier in the step 2), grinding for 25 minutes by a colloid mill until no particles exist, adding 2.0 parts of tert-butylphenol aldehyde vulcanized resin and 2.0 parts of stannous chloride, and stirring for 0.5 hour to obtain the low rolling resistance modified asphalt.
The low rolling resistance modified asphalt prepared by the embodiment comprises the following components in parts by weight: 85 parts of No. 70 petroleum asphalt, 8.64 parts of elastomer blend (solution polymerized styrene-butadiene rubber SSBR and star SBS thermoplastic elastomer), 0.72 part of multi-wall carbon nano tube, 8.64 parts of ethylene bis stearamide, 2.0 parts of tert-butyl phenolic vulcanized resin and 2.0 parts of stannous chloride vulcanization aid.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (19)
1. A low rolling resistance modified asphalt; the method is characterized in that: the low rolling resistance modified asphalt comprises the following components in parts by weight: 80-90 parts of binder, 3.92-10.34 parts of elastomer blend, 0.16-1.32 parts of multi-arm carbon nano tube, 3.92-10.34 parts of high polymer material internal lubricant, 1.0-3.0 parts of rubber cross-linking agent and 1.0-3.0 parts of stannous chloride vulcanizing aid, wherein the rubber cross-linking agent and the stannous chloride vulcanizing aid are mixed in equal proportion to form a rubber vulcanizing agent;
the binder is 70# petroleum asphalt;
the elastomer blend is a styrene-butadiene polymer elastomer;
the multi-arm carbon nanotube is a hydroxyl multi-arm carbon nanotube;
the rubber cross-linking agent is environment-friendly sulfur-free tert-butyl phenolic vulcanized resin.
2. The low rolling resistance modified asphalt of claim 1; the method is characterized in that:
the styrene-butadiene polymer-based elastomer includes: any two of solution polymerized styrene-butadiene rubber, butyl rubber and thermoplastic elastomer.
3. The low rolling resistance modified asphalt of claim 2; the method is characterized in that: the elastomer blend is a mixture of solution polymerized styrene-butadiene rubber and star SBS thermoplastic elastomer.
4. The low rolling resistance modified asphalt of claim 2; the method is characterized in that: the length of the multi-arm carbon nanotube is not more than 50 nm.
5. The low rolling resistance modified asphalt of claim 1, wherein: the polymeric material internal lubricant comprises a fatty acid amide product.
6. The low rolling resistance modified asphalt of claim 2, wherein: the internal lubricant of the high polymer material is as follows: one or two of stearic acid amide and ethylene bis stearamide.
7. A process for preparing a low rolling resistance modified asphalt as defined in any one of claims 2 to 6; the method is characterized in that: the preparation method comprises the following steps:
1) firstly, crushing solution polymerized styrene-butadiene rubber into coarse particles, mixing the coarse particles with a thermoplastic elastomer according to the same weight part, uniformly stirring, and then crushing the uniform mixture to obtain a subdivided polymer elastomer;
2) mixing the finely-divided polymer elastomer, the hydroxyl multi-arm carbon nano tube and the high polymer material internal lubricant in the step 1) in proportion, and then uniformly stirring at a high speed to obtain the low rolling resistance asphalt modifier;
3) preparing low rolling resistance modified asphalt: heating the binder to a certain temperature in a reaction kettle, adding the low rolling resistance asphalt modifier obtained in the step 2), grinding until no particles exist, adding the cross-linking agent and the vulcanization aid in equal proportion, and stirring to obtain the low rolling resistance modified asphalt.
8. A process for producing the low rolling resistance modified asphalt according to claim 7; the method is characterized in that: in the step 1), the diameter of the coarse particles is 3-5 mm.
9. A process for producing the low rolling resistance modified asphalt according to claim 7; the method is characterized in that: in step 1), the size of the finely divided polymeric elastomer is 50 to 100 mesh.
10. A process for producing the low rolling resistance modified asphalt according to claim 7; the method is characterized in that: in the step 2), the weight ratio of the subdivided polymer elastomer, the hydroxyl multi-arm carbon nanotube and the macromolecular lubricant is 47-49: 2-6: 47-49; the stirring time is 3-5 minutes, and the stirring speed is as follows: 3000 to 4000 r/min.
11. A process for producing the low rolling resistance modified asphalt according to claim 7; the method is characterized in that: in the step 3), the content of the binder is 80-90 parts.
12. A process for producing the low rolling resistance modified asphalt according to claim 7; the method is characterized in that: in the step 3), the heating temperature is as follows: 180 ℃ and 185 ℃.
13. A process for producing the low rolling resistance modified asphalt according to claim 7; the method is characterized in that: in the step 3), the content of the low rolling resistance asphalt modifier is 8-22 parts by weight.
14. A process for producing the low rolling resistance modified asphalt according to claim 7; the method is characterized in that: in the step 3), the content of the cross-linking agent and the vulcanizing assistant is 1-3 parts by weight.
15. A process for producing the low rolling resistance modified asphalt according to claim 7; the method is characterized in that: in the step 3), the grinding refers to grinding for 20-40 min by using a colloid mill or a shearing machine.
16. A process for producing the low rolling resistance modified asphalt according to claim 7; the method is characterized in that: in step 3), grinding for 30min by a colloid mill or a shearing machine.
17. A process for producing the low rolling resistance modified asphalt according to claim 7; the method is characterized in that: in the step 3), the stirring time is 0.5-1.5 h.
18. A process for producing the low rolling resistance modified asphalt according to claim 7; the method is characterized in that: in the step 3), the stirring time is 1 h.
19. Use of the low rolling resistance modified asphalt of any of claims 1 to 6 in high grade highway construction, airport runway construction, parking lot construction, bridge construction, asphalt modification.
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| CN109370243A (en) * | 2018-11-14 | 2019-02-22 | 山东建筑大学 | A kind of carbon nanotube SBS composite modifier and preparation method thereof |
| CN109535749A (en) * | 2018-11-14 | 2019-03-29 | 山东建筑大学 | A kind of carbon nanotube SBS composite modified asphalt and preparation method thereof |
| CN113845780B (en) * | 2021-11-09 | 2023-05-30 | 山东高速济南绕城西线公路有限公司 | Low-dissipation energy warm-mix high-viscosity modified asphalt and preparation method and application thereof |
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Effective date of registration: 20200910 Address after: Fengming Road District of Ji'nan City, Shandong province 250000 port development Co-patentee after: Shandong high speed Group Co.,Ltd. Patentee after: Shandong University of Architecture Address before: Feng Ming Licheng District Lingang Development Zone, 250101 Ji'nan Road, Shandong province No. 1000 Co-patentee before: QILU TRANSPORTATION DEVELOPMENT GROUP Co.,Ltd. Patentee before: Shandong University of Architecture |