CN110903667A - Modified asphalt based on carbon nano material and preparation method thereof - Google Patents
Modified asphalt based on carbon nano material and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a modified asphalt based on a carbon nano material and a preparation method thereof, wherein the modified asphalt comprises components such as matrix asphalt, carbon fibers, an ultraviolet blocking agent, SBS rubber, an accelerant, a compatilizer and the like, wherein the ultraviolet blocking agent comprises components such as magnesium aluminum layered double hydroxide, graphene oxide, N-dimethylformamide, didodecyldimethylammonium bromide, ascorbic acid, carbon nano tubes and the like, wherein the magnesium aluminum layered double hydroxide is an inorganic non-metallic material with a multilayer layered structure, and the multilayer layered structure of the magnesium aluminum layered double hydroxide can play a physical and chemical blocking role on ultraviolet light, can be used for aging-resistant modification of asphalt and improves the aging resistance of the asphalt; the invention discloses a modified asphalt based on a carbon nano material and a preparation method thereof, the process design is reasonable, the ultraviolet resistance and the ageing resistance of the modified asphalt are effectively improved, the dispersibility of each component in the asphalt is improved, and the modified asphalt has excellent mechanical properties and higher practicability.
Description
Technical Field
The invention relates to the technical field of asphalt processing, in particular to modified asphalt based on a carbon nano material and a preparation method thereof.
Background
The asphalt is a black-brown complex mixture composed of hydrocarbons with different molecular weights and nonmetal derivatives thereof, is one of high-viscosity organic liquids, is in a liquid state, has a black surface, and is soluble in carbon disulfide. Asphalt is a waterproof, moistureproof and anticorrosive organic cementing material. The asphalt can be mainly divided into coal tar asphalt, petroleum asphalt and natural asphalt: among them, coal tar pitch is a by-product of coking. Petroleum pitch is the residue of crude oil distillation. Natural bitumen is stored underground, and some forms a mineral layer or is accumulated on the surface of the crust. The asphalt is mainly used in the industries of paint, plastics, rubber and the like and pavement and the like.
At present, asphalt pavement is a daily visible article, but in the use process of asphalt, ultraviolet light can cause great damage to the asphalt pavement, and the asphalt pavement can be subjected to thermal-oxidative aging and photo-oxidative aging after being exposed to ultraviolet light for a long time, so that the pavement is cracked and peeled off, the service life of the asphalt pavement is shortened, and inconvenience is brought to people.
In view of the situation, a modified asphalt based on a carbon nano material and a preparation method thereof are designed, which is one of the problems to be solved urgently.
Disclosure of Invention
The invention aims to provide modified asphalt based on a carbon nano material and a preparation method thereof, and aims to solve the problems in the prior art.
In order to achieve the purpose, the invention provides the following technical scheme:
the modified asphalt based on the carbon nano material comprises, by weight, 50-90 parts of matrix asphalt, 10-20 parts of carbon fibers, 20-40 parts of an ultraviolet blocking agent, 30-50 parts of SBS rubber, 5-10 parts of an accelerator, 5-8 parts of a compatilizer, 2-4 parts of an anti-aging agent and 15-20 parts of a cross-linking agent.
According to an optimized scheme, the ultraviolet blocking agent comprises, by weight, 20-30 parts of magnesium-aluminum layered double hydroxide, 20-40 parts of graphene oxide, 25-50 parts of N, N-dimethylformamide, 10-18 parts of didodecyldimethylammonium bromide, 8-14 parts of ascorbic acid and 10-16 parts of carbon nanotubes.
According to an optimized scheme, the magnesium-aluminum layered double hydroxide is prepared by a coprecipitation method of sodium carbonate, sodium hydroxide, magnesium nitrate and aluminum nitrate.
In a more optimized scheme, the compatilizer is carbon disulfide, and the accelerator is any one of 2-mercaptobenzothiazole and dibenzothiazyl disulfide.
According to an optimized scheme, the anti-aging agent is an anti-aging agent RD; the crosslinking agent is triallyl isocyanurate.
The invention discloses modified asphalt based on a carbon nano material, which comprises matrix asphalt, carbon fibers, an ultraviolet blocking agent, SBS rubber, an accelerant, a compatilizer and the like, wherein the ultraviolet blocking agent comprises magnesium aluminum layered double hydroxide, graphene oxide, N-dimethylformamide, didodecyldimethylammonium bromide, ascorbic acid, carbon nano tubes and the like, wherein the magnesium aluminum layered double hydroxide is a multilayer layered mechanism inorganic non-metallic material, and a multilayer layered structure of the magnesium aluminum layered double hydroxide can play a physical and chemical blocking role on ultraviolet light, can be used for aging-resistant modification of asphalt and improves the aging resistance of the asphalt, but as the compatibility between the magnesium aluminum layered double hydroxide and the asphalt is different, magnesium aluminum layered double hydroxide particles are easy to agglomerate and have poor dispersibility; meanwhile, in the process of modifying the asphalt, carbon nano tubes are added into the asphalt, but the compatibility of the carbon nano tubes and the asphalt is very poor, in order to solve the compatibility between the matrix asphalt and each component, the functional modification is firstly carried out through graphene oxide, so that the graphene oxide can be uniformly dispersed in an organic solvent and can also be uniformly dispersed in the asphalt, and then the hybrid compounding of the functional graphene and the carbon nano tubes is carried out, so that the dispersibility of the carbon nano tubes in the asphalt can be improved, and the completeness of conjugated pi structures on the tube walls of the carbon nano tubes can be ensured to the greatest extent, so that the performances of the carbon nano tubes in the aspects of mechanics, heat conduction and the like are ensured, and the modification performance of the carbon nano tubes on the asphalt is ensured.
According to the invention, functionalized graphene and carbon nano tubes are hybridized and compounded to obtain hybrid particles, and magnesium-aluminum layered double hydroxide is generated on the surface of the hybrid particles by a coprecipitation method, so that the magnesium-aluminum layered double hydroxide can be uniformly attached to the surface of the hybrid particles.
Meanwhile, the SBS rubber is added, the SBS rubber can modify the matrix asphalt, the SBS rubber can absorb light components in the asphalt to swell, the swelled particles are mutually glued to form a semi-fixed continuous structure, the asphalt is restrained in the semi-fixed continuous structure, the mechanical property of the asphalt can be improved, meanwhile, when the asphalt and the SBS rubber are in high-temperature mechanical operation, the double bonds of the SBS and aromatic substances in the asphalt inevitably have a certain pi-pi adsorption effect, and the mechanical property and the comprehensive property of the asphalt are effectively improved; meanwhile, the carbon nanotube-functionalized graphene hybrid particles are prepared, when the carbon nanotube-functionalized graphene hybrid particles are blended with SBS rubber, the carbon nanotube-functionalized graphene hybrid particles can coordinate with the SBS rubber, the carbon nanotube has a large specific surface area, so that the absorption and swelling of the SBS rubber on asphalt light components can be effectively promoted, meanwhile, the pi electronic structure of the carbon nanotube can be used as a bridge, the interaction among the carbon nanotube-functionalized graphene hybrid particles, the asphalt components and the SBS rubber is enhanced, and the comprehensive performance of the asphalt is further improved.
A preparation method of modified asphalt based on carbon nano-materials comprises the following steps:
1) preparing materials:
2) preparing an ultraviolet blocking agent;
3) blending an ultraviolet blocking agent, SBS rubber, an accelerant and a compatilizer to obtain a material A;
4) adding the material A, the carbon fiber, the anti-aging agent and the crosslinking agent into the matrix asphalt prepared in the step 1) to prepare the modified asphalt.
The optimized scheme comprises the following steps:
1) preparing materials:
2) preparing an ultraviolet blocking agent:
a) mixing the graphene oxide prepared in the step 1) and N, N-dimethylformamide, performing ultrasonic dispersion for 40-50min to obtain a graphene oxide suspension, adding didodecyldimethylammonium bromide, stirring and reacting under the protection of nitrogen, continuously heating, adding ascorbic acid, reacting for 4-5h, washing dichloromethane and N, N-dimethylformamide, and performing freeze drying to obtain functionalized graphene;
b) dissolving and dispersing the functionalized graphene and N, N-dimethylformamide, adding the carbon nano tube, performing ultrasonic dispersion for 3-4 times, centrifuging, washing and drying to obtain a material B;
c) taking the sodium carbonate, the sodium hydroxide, the magnesium nitrate and the aluminum nitrate prepared in the step 1), dissolving by using deionized water respectively to form a single solution, and obtaining a sodium carbonate solution, a sodium hydroxide solution, a magnesium nitrate solution and an aluminum nitrate solution;
d) dissolving the material B in deionized water, performing ultrasonic dispersion, slowly adding a sodium carbonate solution, a sodium hydroxide solution, a magnesium nitrate solution and an aluminum nitrate solution, heating to 110 ℃, reacting for 16-17h, cooling, performing suction filtration, washing, and drying at the temperature of 80-85 ℃ to obtain an ultraviolet blocking agent;
3) putting the SBS rubber prepared in the step 1), the ultraviolet blocking agent, the accelerant and the compatilizer into a high-speed mixer for blending at the temperature of 60-100 ℃ for 10-20min to obtain a material A;
4) heating the matrix asphalt prepared in the step 1) to 150-160 ℃, adding the material A obtained in the step 3), the carbon fiber prepared in the step 1), the anti-aging agent and the crosslinking agent, and stirring and grinding to obtain the modified asphalt.
The optimized scheme comprises the following steps:
1) preparing materials:
a) preparing graphene oxide, N-dimethylformamide, didodecyldimethylammonium bromide, ascorbic acid and carbon nanotubes in proportion for later use;
b) preparing sodium carbonate, sodium hydroxide, magnesium nitrate, aluminum nitrate, SBS rubber, an accelerator, a compatilizer, matrix asphalt, carbon fibers, an anti-aging agent and a crosslinking agent according to a proportion for later use; preparing materials in the step 1);
2) preparing an ultraviolet blocking agent:
a) mixing the graphene oxide prepared in the step 1) and N, N-dimethylformamide, performing ultrasonic dispersion for 40-50min to obtain a graphene oxide suspension, adding didodecyldimethylammonium bromide, stirring and reacting for 24h under the protection of nitrogen, continuously heating to 90-94 ℃, adding ascorbic acid, continuously reacting for 4-5h, washing with dichloromethane and N, N-dimethylformamide for 4-5 times, and performing freeze drying to obtain functionalized graphene; in the step 2), the graphene oxide is modified to obtain functionalized graphene, so that the functionalized graphene can be uniformly dispersed in asphalt, and a foundation is provided for the subsequent preparation of carbon nanotube-functionalized graphene hybrid particles;
b) dissolving and dispersing the functionalized graphene and N, N-dimethylformamide, adding the carbon nano tube, performing ultrasonic dispersion for 3-4 times, centrifuging for 5-7min at 8000r/min for 30-40min each time, and washing and drying to obtain a material B; adding carbon nano tubes into the functionalized graphene in the step B) to generate a material B, namely carbon nano tube-functionalized graphene hybrid particles;
c) taking the sodium carbonate, the sodium hydroxide, the magnesium nitrate and the aluminum nitrate prepared in the step 1), dissolving by using deionized water respectively to form a single solution, and obtaining a sodium carbonate solution, a sodium hydroxide solution, a magnesium nitrate solution and an aluminum nitrate solution;
d) dissolving the material B in deionized water, performing ultrasonic dispersion for 3-4h, slowly adding a sodium carbonate solution, a sodium hydroxide solution, a magnesium nitrate solution and an aluminum nitrate solution, heating to 100-110 ℃, reacting for 16-17h, cooling, performing suction filtration, washing, and drying at 80-85 ℃ for 12-14h to obtain an ultraviolet blocking agent; preparing magnesium-aluminum layered double hydroxide on the surface of the carbon nano tube-functionalized graphene hybrid particle by using a coprecipitation method in the step d), so that the magnesium-aluminum layered double hydroxide is uniformly attached to the surface of the hybrid particle, and the ultraviolet blocking agent can be uniformly dispersed in matrix asphalt during subsequent asphalt modification;
3) putting the SBS rubber prepared in the step 1), the ultraviolet blocking agent, the accelerant and the compatilizer into a high-speed mixer for blending at the temperature of 60-100 ℃ for 10-20min to obtain a material A; in the step 3), the SBS rubber, the ultraviolet blocking agent, the accelerant and the compatilizer are mixed, and the ultraviolet blocking agent is connected with the SBS rubber;
4) heating the matrix asphalt prepared in the step 1) to 150-160 ℃, adding the material A obtained in the step 3), the carbon fiber prepared in the step 1), the anti-aging agent and the crosslinking agent, stirring for 10-15min, and grinding for 30-60min to obtain the modified asphalt. And 4) adding carbon fibers, an anti-aging agent, a cross-linking agent and the material A into the matrix asphalt, wherein the carbon nano tubes can be used as bridges to cross-link the matrix asphalt, the SBS rubber and other components, so that the mechanical property of the asphalt is further improved.
Compared with the prior art, the invention has the beneficial effects that:
firstly, functionally modifying graphene oxide to obtain functionalized graphene, then adding carbon nano tubes into the functionalized graphene to prepare carbon nano tube-functionalized graphene hybrid particles, so that the carbon nano tubes can be uniformly dispersed in matrix asphalt when the carbon nano tubes are subsequently acted with the matrix asphalt, then preparing magnesium-aluminum layered double hydroxide on the surface of the hybrid particles by using a coprecipitation method, and improving the ultraviolet resistance of the modified asphalt by using the blocking effect of the magnesium-aluminum layered double hydroxide on ultraviolet light; and finally, blending the prepared composite material with SBS rubber, and further improving the mechanical property of the modified asphalt under the synergistic effect.
The invention discloses a modified asphalt based on a carbon nano material and a preparation method thereof, the process design is reasonable, the operation is simple, the ultraviolet resistance and the anti-aging performance of the modified asphalt are effectively improved, the dispersibility of each component in the asphalt is improved, and the modified asphalt has excellent mechanical properties and higher practicability.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
s1: preparing materials:
preparing graphene oxide, N-dimethylformamide, didodecyldimethylammonium bromide, ascorbic acid and carbon nanotubes in proportion; preparing sodium carbonate, sodium hydroxide, magnesium nitrate, aluminum nitrate, SBS rubber, an accelerator, a compatilizer, matrix asphalt, carbon fibers, an anti-aging agent and a crosslinking agent according to a proportion for later use;
s2: preparing an ultraviolet blocking agent:
s21: mixing graphene oxide and N, N-dimethylformamide, performing ultrasonic dispersion for 40min to obtain a graphene oxide suspension, adding didodecyldimethylammonium bromide, stirring and reacting for 24h under the protection of nitrogen, continuously heating to 90 ℃, adding ascorbic acid, continuously reacting for 4h, washing with dichloromethane and N, N-dimethylformamide for 4 times, and performing freeze drying to obtain functionalized graphene;
s22: dissolving and dispersing the functionalized graphene and N, N-dimethylformamide, adding the carbon nano tube, performing ultrasonic dispersion for 3 times, centrifuging for 5min at 8000r/min for 30min each time, and washing and drying to obtain a material B;
s23: taking prepared sodium carbonate, sodium hydroxide, magnesium nitrate and aluminum nitrate, dissolving by using deionized water respectively to form a single solution, and obtaining a sodium carbonate solution, a sodium hydroxide solution, a magnesium nitrate solution and an aluminum nitrate solution;
s24: dissolving the material B in deionized water, performing ultrasonic dispersion for 3 hours, slowly adding a sodium carbonate solution, a sodium hydroxide solution, a magnesium nitrate solution and an aluminum nitrate solution, heating to 100 ℃, reacting for 16 hours, cooling, performing suction filtration, washing, and drying at 80 ℃ for 12 hours to obtain an ultraviolet blocking agent;
s3: putting SBS rubber, ultraviolet blocking agent, accelerant and compatilizer into a high-speed mixer for blending at the temperature of 60 ℃ for 10min to obtain material A;
s4: taking prepared matrix asphalt, heating to 150 ℃, adding the material A, the carbon fiber, the anti-aging agent and the crosslinking agent, stirring for 10min, and grinding for 30min to obtain the modified asphalt.
In the embodiment, the raw materials of each component of the modified asphalt comprise, by weight, 50 parts of matrix asphalt, 10 parts of carbon fibers, 20 parts of an ultraviolet blocking agent, 30 parts of SBS rubber, 5 parts of an accelerator, 5 parts of a compatilizer, 2 parts of an anti-aging agent and 15 parts of a cross-linking agent.
The ultraviolet blocking agent comprises the following raw materials, by weight, 20 parts of magnesium-aluminum layered double hydroxide, 20 parts of graphene oxide, 25 parts of N, N-dimethylformamide, 10 parts of didodecyldimethylammonium bromide, 8 parts of ascorbic acid and 10 parts of carbon nanotubes.
The compatilizer is carbon disulfide, and the accelerator is any one of 2-mercaptobenzothiazole and dibenzothiazyl disulfide; the anti-aging agent is an anti-aging agent RD; the crosslinking agent is triallyl isocyanurate.
Example 2:
s1: preparing materials:
preparing graphene oxide, N-dimethylformamide, didodecyldimethylammonium bromide, ascorbic acid and carbon nanotubes in proportion; preparing sodium carbonate, sodium hydroxide, magnesium nitrate, aluminum nitrate, SBS rubber, an accelerator, a compatilizer, matrix asphalt, carbon fibers, an anti-aging agent and a crosslinking agent according to a proportion for later use;
s2: preparing an ultraviolet blocking agent:
s21: mixing graphene oxide and N, N-dimethylformamide, performing ultrasonic dispersion for 44min to obtain a graphene oxide suspension, adding didodecyldimethylammonium bromide, stirring and reacting for 24h under the protection of nitrogen, continuously heating to 92 ℃, adding ascorbic acid, continuously reacting for 4.5h, washing with dichloromethane and N, N-dimethylformamide for 4 times, and performing freeze drying to obtain functionalized graphene;
s22: dissolving and dispersing the functionalized graphene and N, N-dimethylformamide, adding the carbon nano tube, performing ultrasonic dispersion for 3 times, centrifuging for 6min at 8000r/min for 32min each time, and washing and drying to obtain a material B;
s23: taking prepared sodium carbonate, sodium hydroxide, magnesium nitrate and aluminum nitrate, dissolving by using deionized water respectively to form a single solution, and obtaining a sodium carbonate solution, a sodium hydroxide solution, a magnesium nitrate solution and an aluminum nitrate solution;
s24: dissolving the material B in deionized water, performing ultrasonic dispersion for 3.5h, slowly adding a sodium carbonate solution, a sodium hydroxide solution, a magnesium nitrate solution and an aluminum nitrate solution, heating to 105 ℃, reacting for 16.5h, cooling, performing suction filtration, washing, and drying at 82 ℃ for 12-14h to obtain an ultraviolet blocking agent;
s3: putting SBS rubber, ultraviolet blocking agent, accelerant and compatilizer into a high-speed mixer for blending at the temperature of 75 ℃ for 15min to obtain material A;
s4: taking prepared matrix asphalt, heating to 154 ℃, adding the material A, the carbon fiber, the anti-aging agent and the crosslinking agent, stirring for 12min, and grinding for 45min to obtain the modified asphalt.
In the embodiment, the raw materials of each component of the modified asphalt comprise, by weight, 55 parts of matrix asphalt, 12 parts of carbon fibers, 25 parts of an ultraviolet blocking agent, 35 parts of SBS rubber, 6 parts of an accelerator, 6 parts of a compatilizer, 3 parts of an anti-aging agent and 17 parts of a cross-linking agent.
The ultraviolet blocking agent comprises the following raw materials, by weight, 25 parts of magnesium-aluminum layered double hydroxide, 30 parts of graphene oxide, 35 parts of N, N-dimethylformamide, 14 parts of didodecyldimethylammonium bromide, 10 parts of ascorbic acid and 15 parts of carbon nano tubes.
The compatilizer is carbon disulfide, and the accelerator is any one of 2-mercaptobenzothiazole and dibenzothiazyl disulfide; the anti-aging agent is an anti-aging agent RD; the crosslinking agent is triallyl isocyanurate.
Example 3:
s1: preparing materials:
preparing graphene oxide, N-dimethylformamide, didodecyldimethylammonium bromide, ascorbic acid and carbon nanotubes in proportion; preparing sodium carbonate, sodium hydroxide, magnesium nitrate, aluminum nitrate, SBS rubber, an accelerator, a compatilizer, matrix asphalt, carbon fibers, an anti-aging agent and a crosslinking agent according to a proportion for later use;
s2: preparing an ultraviolet blocking agent:
s21: mixing graphene oxide and N, N-dimethylformamide, performing ultrasonic dispersion for 48min to obtain a graphene oxide suspension, adding didodecyldimethylammonium bromide, stirring and reacting for 24h under the protection of nitrogen, continuously heating to 93 ℃, adding ascorbic acid, continuously reacting for 4.8h, washing with dichloromethane and N, N-dimethylformamide for 5 times, and performing freeze drying to obtain functionalized graphene;
s22: dissolving and dispersing the functionalized graphene and N, N-dimethylformamide, adding the carbon nano tube, performing ultrasonic dispersion for 4 times, centrifuging for 6min at 8000r/min for 38min each time, and washing and drying to obtain a material B;
s23: taking prepared sodium carbonate, sodium hydroxide, magnesium nitrate and aluminum nitrate, dissolving by using deionized water respectively to form a single solution, and obtaining a sodium carbonate solution, a sodium hydroxide solution, a magnesium nitrate solution and an aluminum nitrate solution;
s24: dissolving the material B in deionized water, performing ultrasonic dispersion for 3.8h, slowly adding a sodium carbonate solution, a sodium hydroxide solution, a magnesium nitrate solution and an aluminum nitrate solution, heating to 108 ℃, reacting for 16.6h, cooling, performing suction filtration, washing, and drying at 84 ℃ for 13h to obtain an ultraviolet blocking agent;
s3: putting SBS rubber, ultraviolet blocking agent, accelerant and compatilizer into a high-speed mixer for blending at the temperature of 85 ℃ for 18min to obtain a material A;
s4: taking prepared matrix asphalt, heating to 156 ℃, adding the material A, the carbon fiber, the anti-aging agent and the crosslinking agent, stirring for 14min, and grinding for 44min to obtain the modified asphalt.
In the embodiment, the raw materials of each component of the modified asphalt comprise, by weight, 85 parts of matrix asphalt, 18 parts of carbon fibers, 35 parts of an ultraviolet blocking agent, 45 parts of SBS rubber, 9 parts of an accelerator, 7 parts of a compatilizer, 3 parts of an anti-aging agent and 17 parts of a cross-linking agent.
The ultraviolet blocking agent comprises the following raw materials, by weight, 28 parts of magnesium-aluminum layered double hydroxide, 35 parts of graphene oxide, 37 parts of N, N-dimethylformamide, 16 parts of didodecyldimethylammonium bromide, 12 parts of ascorbic acid and 15 parts of carbon nano tubes.
The compatilizer is carbon disulfide, and the accelerator is any one of 2-mercaptobenzothiazole and dibenzothiazyl disulfide; the anti-aging agent is an anti-aging agent RD; the crosslinking agent is triallyl isocyanurate.
Example 4:
s1: preparing materials:
preparing graphene oxide, N-dimethylformamide, didodecyldimethylammonium bromide, ascorbic acid and carbon nanotubes in proportion; preparing sodium carbonate, sodium hydroxide, magnesium nitrate, aluminum nitrate, SBS rubber, an accelerator, a compatilizer, matrix asphalt, carbon fibers, an anti-aging agent and a crosslinking agent according to a proportion for later use;
s2: preparing an ultraviolet blocking agent:
s21: mixing graphene oxide and N, N-dimethylformamide, performing ultrasonic dispersion for 50min to obtain a graphene oxide suspension, adding didodecyldimethylammonium bromide, stirring and reacting for 24h under the protection of nitrogen, continuously heating to 94 ℃, adding ascorbic acid, continuously reacting for 5h, washing with dichloromethane and N, N-dimethylformamide for 5 times, and performing freeze drying to obtain functionalized graphene;
s22: dissolving and dispersing the functionalized graphene and N, N-dimethylformamide, adding the carbon nano tube, performing ultrasonic dispersion for 4 times, centrifuging for 7min at 8000r/min for 40min each time, and washing and drying to obtain a material B;
s23: taking prepared sodium carbonate, sodium hydroxide, magnesium nitrate and aluminum nitrate, dissolving by using deionized water respectively to form a single solution, and obtaining a sodium carbonate solution, a sodium hydroxide solution, a magnesium nitrate solution and an aluminum nitrate solution;
s24: dissolving the material B in deionized water, performing ultrasonic dispersion for 4 hours, slowly adding a sodium carbonate solution, a sodium hydroxide solution, a magnesium nitrate solution and an aluminum nitrate solution, heating to 110 ℃, reacting for 17 hours, cooling, performing suction filtration, washing, and drying at 85 ℃ for 14 hours to obtain an ultraviolet blocking agent;
s3: putting SBS rubber, ultraviolet blocking agent, accelerant and compatilizer into a high-speed mixer for blending at the temperature of 100 ℃ for 20min to obtain material A;
s4: taking prepared matrix asphalt, heating to 160 ℃, adding the material A, the carbon fiber, the anti-aging agent and the crosslinking agent, stirring for 15min, and grinding for 60min to obtain the modified asphalt.
In the embodiment, the raw materials of each component of the modified asphalt comprise, by weight, 90 parts of matrix asphalt, 20 parts of carbon fibers, 40 parts of an ultraviolet blocking agent, 50 parts of SBS rubber, 10 parts of an accelerator, 8 parts of a compatilizer, 4 parts of an anti-aging agent and 20 parts of a cross-linking agent.
The ultraviolet blocking agent comprises the following raw materials, by weight, 30 parts of magnesium-aluminum layered double hydroxide, 40 parts of graphene oxide, 50 parts of N, N-dimethylformamide, 18 parts of didodecyldimethylammonium bromide, 14 parts of ascorbic acid and 16 parts of carbon nanotubes.
The compatilizer is carbon disulfide, and the accelerator is any one of 2-mercaptobenzothiazole and dibenzothiazyl disulfide; the anti-aging agent is an anti-aging agent RD; the crosslinking agent is triallyl isocyanurate.
Experiment 1:
the modified asphalts prepared in examples 1-4 were each subjected to a separation degree test to obtain the data shown in the following table:
| upper softening point/. degree.C | Lower softening point/. degree.C | Difference/. degree.C | |
| Example 1 | 62.4 | 63.4 | 1.0 |
| Example 2 | 62.5 | 63.6 | 1.1 |
| Example 3 | 62.3 | 63.4 | 1.1 |
| Example 4 | 63.4 | 64.6 | 1.2 |
As can be seen from the above table, the maximum difference in examples 1-4 can reach 1.2, and the minimum difference is 1.0, which indicates that the phases of the asphalt prepared in examples 1-4 are not easy to separate and have high stability.
Experiment 2:
taking the modified asphalt prepared in the examples 1 to 4, respectively carrying out an indoor strong ultraviolet aging test and an outdoor natural aging test for 3 months on a sample, wherein the outdoor test is carried out in 6 to 9 months in summer (the test method is the aging test method described in patent CN 201310088376.8), spreading the prepared modified asphalt on a glass plate, placing the glass plate at the outdoor sunlight irradiation strong place, and the spreading thickness of the asphalt is consistent with that of the indoor test, so as to obtain the following data:
wherein the penetration and ductility ratio after the indoor strong ultraviolet aging is the ratio of the value after the indoor aging to the value after the heat aging; the penetration and ductility ratio after outdoor aging is the ratio of the value after outdoor aging to the value after heat aging.
And (4) conclusion: the invention discloses a modified asphalt based on a carbon nano material and a preparation method thereof, the process design is reasonable, the operation is simple, the ultraviolet resistance and the anti-aging performance of the modified asphalt are effectively improved, the dispersibility of each component in the asphalt is improved, and the modified asphalt has excellent mechanical properties and higher practicability.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (8)
1. A modified asphalt based on carbon nano-materials is characterized in that: the modified asphalt comprises, by weight, 50-90 parts of matrix asphalt, 10-20 parts of carbon fibers, 20-40 parts of ultraviolet blocking agent, 30-50 parts of SBS rubber, 5-10 parts of accelerator, 5-8 parts of compatilizer, 2-4 parts of anti-aging agent and 15-20 parts of cross-linking agent.
2. The modified asphalt based on carbon nanomaterial as defined in claim 1, wherein: the ultraviolet blocking agent comprises, by weight, 20-30 parts of magnesium-aluminum layered double hydroxide, 20-40 parts of graphene oxide, 25-50 parts of N, N-dimethylformamide, 10-18 parts of didodecyldimethylammonium bromide, 8-14 parts of ascorbic acid and 10-16 parts of carbon nanotubes.
3. The modified asphalt based on carbon nanomaterial as defined in claim 2, wherein: the magnesium-aluminum layered double hydroxide is prepared by a coprecipitation method of sodium carbonate, sodium hydroxide, magnesium nitrate and aluminum nitrate.
4. The modified asphalt based on carbon nanomaterial as defined in claim 1, wherein: the compatilizer is carbon disulfide, and the accelerator is any one of 2-mercaptobenzothiazole and dibenzothiazyl disulfide.
5. The modified asphalt based on carbon nanomaterial as defined in claim 1, wherein: the anti-aging agent is an anti-aging agent RD; the crosslinking agent is triallyl isocyanurate.
6. A preparation method of modified asphalt based on carbon nano materials is characterized by comprising the following steps: the method comprises the following steps:
1) preparing materials:
2) preparing an ultraviolet blocking agent;
3) blending an ultraviolet blocking agent, SBS rubber, an accelerant and a compatilizer to obtain a material A;
4) adding the material A, the carbon fiber, the anti-aging agent and the crosslinking agent into the matrix asphalt prepared in the step 1) to prepare the modified asphalt.
7. The method for preparing the modified asphalt based on the carbon nano-material according to claim 6, which is characterized in that: the method comprises the following steps:
1) preparing materials:
2) preparing an ultraviolet blocking agent:
a) mixing the graphene oxide prepared in the step 1) and N, N-dimethylformamide, performing ultrasonic dispersion for 40-50min to obtain a graphene oxide suspension, adding didodecyldimethylammonium bromide, stirring and reacting under the protection of nitrogen, continuously heating, adding ascorbic acid, reacting for 4-5h, washing dichloromethane and N, N-dimethylformamide, and performing freeze drying to obtain functionalized graphene;
b) dissolving and dispersing the functionalized graphene and N, N-dimethylformamide, adding the carbon nano tube, performing ultrasonic dispersion for 3-4 times, centrifuging, washing and drying to obtain a material B;
c) taking the sodium carbonate, the sodium hydroxide, the magnesium nitrate and the aluminum nitrate prepared in the step 1), dissolving by using deionized water respectively to form a single solution, and obtaining a sodium carbonate solution, a sodium hydroxide solution, a magnesium nitrate solution and an aluminum nitrate solution;
d) dissolving the material B in deionized water, performing ultrasonic dispersion, slowly adding a sodium carbonate solution, a sodium hydroxide solution, a magnesium nitrate solution and an aluminum nitrate solution, heating to 110 ℃, reacting for 16-17h, cooling, performing suction filtration, washing, and drying at the temperature of 80-85 ℃ to obtain an ultraviolet blocking agent;
3) putting the SBS rubber prepared in the step 1), the ultraviolet blocking agent, the accelerant and the compatilizer into a high-speed mixer for blending at the temperature of 60-100 ℃ for 10-20min to obtain a material A;
4) heating the matrix asphalt prepared in the step 1) to 150-160 ℃, adding the material A obtained in the step 3), the carbon fiber prepared in the step 1), the anti-aging agent and the crosslinking agent, and stirring and grinding to obtain the modified asphalt.
8. The method for preparing the modified asphalt based on the carbon nano-material according to claim 7, wherein the method comprises the following steps: the method comprises the following steps:
1) preparing materials:
a) preparing graphene oxide, N-dimethylformamide, didodecyldimethylammonium bromide, ascorbic acid and carbon nanotubes in proportion for later use;
b) preparing sodium carbonate, sodium hydroxide, magnesium nitrate, aluminum nitrate, SBS rubber, an accelerator, a compatilizer, matrix asphalt, carbon fibers, an anti-aging agent and a crosslinking agent according to a proportion for later use;
2) preparing an ultraviolet blocking agent:
a) mixing the graphene oxide prepared in the step 1) and N, N-dimethylformamide, performing ultrasonic dispersion for 40-50min to obtain a graphene oxide suspension, adding didodecyldimethylammonium bromide, stirring and reacting for 24h under the protection of nitrogen, continuously heating to 90-94 ℃, adding ascorbic acid, continuously reacting for 4-5h, washing with dichloromethane and N, N-dimethylformamide for 4-5 times, and performing freeze drying to obtain functionalized graphene;
b) dissolving and dispersing the functionalized graphene and N, N-dimethylformamide, adding the carbon nano tube, performing ultrasonic dispersion for 3-4 times, centrifuging for 5-7min at 8000r/min for 30-40min each time, and washing and drying to obtain a material B;
c) taking the sodium carbonate, the sodium hydroxide, the magnesium nitrate and the aluminum nitrate prepared in the step 1), dissolving by using deionized water respectively to form a single solution, and obtaining a sodium carbonate solution, a sodium hydroxide solution, a magnesium nitrate solution and an aluminum nitrate solution;
d) dissolving the material B in deionized water, performing ultrasonic dispersion for 3-4h, slowly adding a sodium carbonate solution, a sodium hydroxide solution, a magnesium nitrate solution and an aluminum nitrate solution, heating to 100-110 ℃, reacting for 16-17h, cooling, performing suction filtration, washing, and drying at 80-85 ℃ for 12-14h to obtain an ultraviolet blocking agent;
3) putting the SBS rubber prepared in the step 1), the ultraviolet blocking agent, the accelerant and the compatilizer into a high-speed mixer for blending at the temperature of 60-100 ℃ for 10-20min to obtain a material A;
4) heating the matrix asphalt prepared in the step 1) to 150-160 ℃, adding the material A obtained in the step 3), the carbon fiber prepared in the step 1), the anti-aging agent and the crosslinking agent, stirring for 10-15min, and grinding for 30-60min to obtain the modified asphalt.
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