CN113773656B - Compression-resistant noise-reducing asphalt cement and preparation method thereof - Google Patents
Compression-resistant noise-reducing asphalt cement and preparation method thereof Download PDFInfo
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L95/00—Compositions of bituminous materials, e.g. asphalt, tar, pitch
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
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- C08K3/32—Phosphorus-containing compounds
- C08K2003/329—Phosphorus containing acids
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- C—CHEMISTRY; METALLURGY
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
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Abstract
The invention discloses a compression-resistant noise-reducing asphalt cement and a preparation method thereof, and relates to the field of road asphalt modification. When the compression-resistant noise-reduction asphalt cement is prepared, modified polycarbonate, polyphosphoric acid and petroleum asphalt are blended to prepare the compression-resistant noise-reduction asphalt cement; the modified polycarbonate is prepared by blending carboxylated carbon nanotubes, modified glass fiber and polycarbonate, wherein the modified glass fiber is prepared by grafting epoxy groups on the surface of glass fiber and then grafting polyethyleneimine; the compression-resistant noise-reducing asphalt cement prepared by the invention not only has the performance of sound absorption and noise reduction, but also is more compression-resistant, simultaneously improves the low-temperature performance of the asphalt cement, improves the viscosity and toughness of asphalt, and delays the aging of the product.
Description
Technical Field
The invention relates to the field of road asphalt modification, in particular to a compression-resistant noise-reducing asphalt cement and a preparation method thereof.
Background
The existing hard asphalt cement and asphalt mixture generally have the following defects: the common hard asphalt cement has large low-temperature brittleness and insufficient bending and tensile resistance, is easy to generate temperature shrinkage cracks when being applied to common asphalt mixtures, and is difficult to popularize and apply in northern cold and severe cold areas; the common hard asphalt cement has less soft components, and the fatigue resistance when being applied to high-modulus asphalt mixture can be greatly reduced, so that the durability of the asphalt cement is obviously reduced.
How to improve the adaptability of the hard asphalt cement in northern cold regions, improve the fatigue resistance and the durability of the hard asphalt cement, and especially how to improve the low-temperature brittleness and the bending and pulling resistance of the hard asphalt cement while ensuring the excellent anti-rutting performance of the hard asphalt cement under the conditions of high temperature and heavy load is a technical problem which is difficult to solve for a long time by technical personnel in the field. The research of the invention prepares the compression-resistant noise-reducing asphalt cement, which not only has the performance of sound absorption and noise reduction, but also is more compression-resistant, improves the low-temperature performance of the asphalt cement, improves the viscosity and toughness of asphalt, and delays the aging of the product
Disclosure of Invention
The invention aims to provide a compression-resistant noise-reduction asphalt cement and a preparation method thereof, so as to solve the problems in the background technology.
The compression-resistant noise-reducing asphalt cement is characterized by mainly comprising the following raw material components in parts by weight: 100 to 200 parts of petroleum asphalt, 3 to 10 parts of polyphosphoric acid and 3 to 10 parts of modified polycarbonate.
Preferably, the petroleum asphalt is petroleum asphalt with the asphaltene content of 60-70%.
Preferably, the modified polycarbonate is prepared by blending carboxylated carbon nanotubes, modified glass fibers and polycarbonate.
Preferably, the modified glass fiber is prepared by grafting epoxy groups on the surface of the glass fiber and then grafting polyethyleneimine.
Preferably, the preparation method of the compression-resistant noise-reduction asphalt cement comprises the following steps: the preparation method comprises the steps of modified glass fiber preparation, carboxylated carbon nano tube preparation, modified polycarbonate preparation and compression-resistant noise-reduction asphalt cement preparation.
Preferably, the preparation method of the compression-resistant and noise-reducing asphalt cement comprises the following specific steps:
(1) Dissolving epoxy chloropropane in 1.5mol/L sodium hydroxide solution which is 5-8 times of the mass of epoxy chloropropane, uniformly mixing, adding glass fiber which is 1-3 times of the mass of epoxy chloropropane, reacting for 12h at 25 ℃, and washing for 3-5 times by using deionized water after reaction to prepare pre-modified glass fiber;
(2) Dissolving polyethyleneimine into anhydrous ethanol with the mass of 10 times that of the polyethyleneimine, uniformly mixing, adding pre-glass fiber with the mass of 1-2 times that of the polyethyleneimine, reacting for 24 hours at 80 ℃, performing oscillation washing with 95% ethanol at 30 ℃, then placing into a blast drying oven, and drying for 5-8 hours at 40 ℃ to obtain modified glass fiber;
(3) Mixing a multi-walled carbon nanotube, sodium nitrate and 30% hydrogen peroxide by mass ratio, heating to 60 ℃ in a water bath, carrying out reflux reaction for 30min, cooling to room temperature, washing for 2-3 times by using a 5% hydrochloric acid solution by mass ratio, centrifuging, washing by using deionized water until the washing solution is neutral, and drying at 70 ℃ until the weight is constant to obtain a carboxylated carbon nanotube;
(4) Heating polycarbonate to 240 ℃, preserving heat for 30min, adding modified glass fiber with the mass 1.2-1.3 times of that of the polycarbonate, carrying out magnetic stirring, and stirring at the rotating speed of 1000rpm for 10min to prepare pre-modified polycarbonate; grinding the carboxylated carbon nano tubes to 50-100 meshes, continuously adding the carboxylated carbon nano tubes with the mass 1.2-1.3 times that of the polycarbonate into the pre-modified polycarbonate, carrying out magnetic stirring, stirring at the rotating speed of 1000rpm for 10min to prepare modified polycarbonate, and keeping the temperature for later use;
(5) Heating the petroleum asphalt to 240 ℃, adding polyphosphoric acid, stirring for 3-5 h at 400-800 rpm, adding modified polycarbonate, and stirring and developing for 1-2 h at 400-800 rpm to prepare the compression-resistant noise-reduction asphalt cement.
Preferably, in the step (1): the diameter of the glass fiber is 10-50 μm.
Preferably, in the step (3): the mass ratio of the multi-wall carbon nano tube to the sodium nitrate to the 30% hydrogen peroxide is 1:1:20.
preferably, in the step (5): the mass ratio of the petroleum asphalt to the polyphosphoric acid to the modified polycarbonate is 100:3:3 to 100:5:5.
compared with the prior art, the invention has the following beneficial effects:
when the compression-resistant noise-reduction asphalt cement is prepared, modified polycarbonate, polyphosphoric acid and petroleum asphalt are blended to prepare the compression-resistant noise-reduction asphalt cement; the modified polycarbonate is prepared by blending carboxylated carbon nanotubes, modified glass fibers and polycarbonate;
performing carboxylation modification on the carbon nano tube by using hydrogen peroxide, and introducing oxygen-containing functional groups of carboxyl, hydroxyl and carbonyl into the tail end defect of the carbon nano tube; the modified glass fiber is prepared by grafting epoxy on the surface of glass fiber and then grafting polyethyleneimine, the heat resistance of the modified glass fiber is improved, and simultaneously, a large amount of amino exists on the surface, polycarbonate and the modified glass fiber are blended, so that the modified glass fiber with the amino reacts with terminal carboxyl of the polycarbonate to form long-chain molecules, and simultaneously, terminal hydroxyl on the polycarbonate reacts with oxygen-containing functional group carboxyl, hydroxyl and carbonyl on a carbon nano tube which can be carboxylated by the modified fiber with the amino to form a modified polycarbonate with a ring structure and irregularly and mutually surrounding, the structure not only enhances the impact strength of the polycarbonate, but also after the modified glass fiber is blended with petroleum asphalt, pores in the modified polycarbonate are sealed by the petroleum asphalt to form a fine closed space, so that the product has the performance of sound absorption and noise reduction, and can be used as a supporting point in asphalt cement, so that the product is more pressure-resistant when being used for producing asphalt pavement;
polyphosphoric acid reacts with active sites in petroleum asphalt molecules to break asphaltene clusters and enhance the dispersion degree of asphaltenes, modified polycarbonate is added into the petroleum asphalt in which the asphaltenes are uniformly dispersed, the other end of the polyphosphoric acid is grafted on the modified polycarbonate to gradually change the discrete modified polycarbonate into a long cross-linked chain with a circular ring, so that a flocculent polymer network is formed on a microcosmic side and a stable space network is formed in the petroleum asphalt, the space network structure coats a closed space to prevent collapse under the condition of overlarge pressure and further cause the cracking of a pavement made of the asphalt cement from the inside, meanwhile, the polyphosphoric acid is used as a bridge to tightly combine the petroleum asphalt with the modified polycarbonate, and the brittleness of the petroleum asphalt is reduced and the low-temperature performance of the asphalt cement is improved by virtue of the flocculent soft modified polycarbonate; carbonyl, sulfonyl and other groups can be generated in the asphalt aging process, and the polyphosphoric acid reacts with active sites in petroleum asphalt molecules, and asphalt matrixes are uniformly dispersed, so that the generation of the carbonyl, sulfonyl and other groups is slowed down, and the aging of the product is delayed.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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.
In order to illustrate the method provided by the present invention more clearly, the following examples are used to illustrate the method for testing each index of the compression and noise reduction asphalt cement prepared in the following examples as follows:
noise reduction performance: preparing the compression-resistant noise-reduction asphalt cements prepared in the examples 1 and 2 and the comparative examples 1, 2 and 3 into the same experimental pavement, and carrying out noise reduction test by using a decibel meter;
and (3) low temperature: the compression-resistant and noise-reduction asphalt cement prepared in the embodiments 1 and 2 and the comparative examples 1, 2 and 3 is subjected to ductility test by using a ductility tester under the same environment of 5 ℃, and the higher the ductility is, the better the low-temperature performance is;
aging property: carrying out penetration test on the compression-resistant and noise-reduction asphalt cement prepared in the examples 1 and 2 and the comparative examples 1, 2 and 3 by adopting JTG/T0604-2011, and then calculating a penetration index PI according to the specification;
high temperature: the compression-resistant and noise-reduction asphalt cements prepared in the examples 1 and 2 and the comparative examples 1, 2 and 3 are subjected to a softening point test by JTG/T0606-2011.
Example 1
The compression-resistant noise-reducing asphalt cement mainly comprises the following components in parts by weight:
100 parts of petroleum asphalt, 3 parts of polyphosphoric acid and 3 parts of modified polycarbonate.
A preparation method of a compression-resistant noise-reducing asphalt cement comprises the following steps:
(1) Dissolving epoxy chloropropane in 1.5mol/L sodium hydroxide solution with the mass 5 times that of the epoxy chloropropane, uniformly mixing, adding glass fiber with the mass 1 time that of the epoxy chloropropane and the diameter of 10 mu m, reacting for 12h at 25 ℃, washing for 3 times by using deionized water after reaction, and preparing pre-modified glass fiber;
(2) Dissolving polyethyleneimine in anhydrous ethanol with the mass of 10 times that of the polyethyleneimine, uniformly mixing, adding pre-glass fiber with the mass of 1 time that of the polyethyleneimine, reacting for 24 hours at 80 ℃, performing oscillation washing with 95% ethanol at 30 ℃, then placing in a blast drying oven, and drying for 5 hours at 40 ℃ to obtain modified glass fiber;
(3) Mixing a multi-wall carbon nano tube, sodium nitrate and 30% hydrogen peroxide in a mass ratio of 1:1:20, mixing, heating to 60 ℃ in a water bath, carrying out reflux reaction for 30min, cooling to room temperature, washing for 2 times by using a hydrochloric acid solution with the mass fraction of 5%, centrifuging, washing by using deionized water until the washing solution is neutral, and drying at 70 ℃ to constant weight to obtain a carboxylated carbon nanotube;
(4) Heating polycarbonate to 240 ℃, preserving heat for 30min, adding modified glass fiber with the mass 1.2 times that of the polycarbonate, carrying out magnetic stirring, and stirring at the rotating speed of 1000rpm for 10min to prepare pre-modified polycarbonate; grinding the carboxylated carbon nanotubes to 50 meshes, continuously adding the carboxylated carbon nanotubes with the mass 1.2 times that of the polycarbonate into the pre-modified polycarbonate, carrying out magnetic stirring, stirring at the rotating speed of 1000rpm for 10min to prepare modified polycarbonate, and keeping the temperature for later use;
(5) Heating petroleum asphalt to 240 ℃, adding polyphosphoric acid, stirring at 400rpm for 3 hours, adding modified polycarbonate, stirring and developing at 400rpm for 1 hour, wherein the mass ratio of the petroleum asphalt to the polyphosphoric acid to the modified polycarbonate is 100:3:3, preparing the compression-resistant noise-reducing asphalt cement.
Example 2
The compression-resistant noise-reducing asphalt cement mainly comprises the following components in parts by weight:
200 parts of petroleum asphalt, 10 parts of polyphosphoric acid and 10 parts of modified polycarbonate.
A preparation method of a compression-resistant noise-reducing asphalt cement comprises the following steps:
(1) Dissolving epoxy chloropropane in 1.5mol/L sodium hydroxide solution with the mass 8 times that of the epoxy chloropropane, adding glass fiber with the diameter of 50 mu m and the mass 3 times that of the epoxy chloropropane after uniform mixing, reacting for 12h at 25 ℃, washing for 5 times by using deionized water after reaction, and preparing pre-modified glass fiber;
(2) Dissolving polyethyleneimine in anhydrous ethanol with the mass of 10 times that of the polyethyleneimine, uniformly mixing, adding pre-glass fiber with the mass of 2 times that of the polyethyleneimine, reacting for 24 hours at 80 ℃, performing oscillation washing with 95% ethanol at 30 ℃, then placing in a blast drying oven, and drying for 8 hours at 40 ℃ to obtain modified glass fiber;
(3) Mixing a multi-wall carbon nano tube, sodium nitrate and 30% hydrogen peroxide in a mass ratio of 1:1:20, mixing, heating to 60 ℃ in a water bath, carrying out reflux reaction for 30min, cooling to room temperature, washing for 3 times by using a hydrochloric acid solution with the mass fraction of 5%, centrifuging, washing by using deionized water until the washing solution is neutral, and drying at 70 ℃ to constant weight to obtain a carboxylated carbon nanotube;
(4) Heating polycarbonate to 240 ℃, preserving heat for 30min, adding modified glass fiber with the mass 1.3 times that of the polycarbonate, carrying out magnetic stirring, and stirring at the rotating speed of 1000rpm for 10min to prepare pre-modified polycarbonate; grinding the carboxylated carbon nano tubes to 100 meshes, continuously adding the carboxylated carbon nano tubes with the mass 1.3 times that of the polycarbonate into the pre-modified polycarbonate, carrying out magnetic stirring, stirring for 10min at the rotating speed of 1000rpm, preparing the modified polycarbonate, and keeping the temperature for later use;
(5) Heating petroleum asphalt to 240 ℃, adding polyphosphoric acid, stirring for 5h at 800rpm, adding modified polycarbonate, stirring and developing for 2h at 800rpm, wherein the mass ratio of the petroleum asphalt to the polyphosphoric acid to the modified polycarbonate is 100:5: and 5, preparing the compression-resistant noise-reduction asphalt cement.
Comparative example 1
The compression-resistant noise-reducing asphalt cement mainly comprises the following components in parts by weight:
100 parts of petroleum asphalt, 3 parts of polyphosphoric acid and 3 parts of modified polycarbonate.
A preparation method of the compression-resistant noise-reduction asphalt cement comprises the following steps:
(1) Mixing a multi-wall carbon nano tube, sodium nitrate and 30% hydrogen peroxide in a mass ratio of 1:1:20, mixing, heating to 60 ℃ in a water bath, carrying out reflux reaction for 30min, cooling to room temperature, washing for 2 times by using a hydrochloric acid solution with the mass fraction of 5%, centrifuging, washing by using deionized water until the washing solution is neutral, and drying at 70 ℃ to constant weight to obtain a carboxylated carbon nanotube;
(2) Heating polycarbonate to 240 ℃, preserving heat for 30min, adding glass fiber with the mass 1.2 times that of the polycarbonate, carrying out magnetic stirring, and stirring at the rotating speed of 1000rpm for 10min to prepare pre-modified polycarbonate; grinding the carboxylated carbon nanotubes to 50 meshes, continuously adding the carboxylated carbon nanotubes with the mass 1.2 times that of the polycarbonate into the pre-modified polycarbonate, carrying out magnetic stirring, stirring at the rotating speed of 1000rpm for 10min to prepare modified polycarbonate, and keeping the temperature for later use;
(3) Heating petroleum asphalt to 240 ℃, adding polyphosphoric acid, stirring at 400rpm for 3 hours, adding modified polycarbonate, stirring and developing at 400rpm for 1 hour, wherein the mass ratio of the petroleum asphalt to the polyphosphoric acid to the modified polycarbonate is 100:3:3, preparing the compression-resistant noise-reducing asphalt cement.
Comparative example 2
The compression-resistant noise-reducing asphalt cement mainly comprises the following components in parts by weight:
100 parts of petroleum asphalt, 3 parts of polyphosphoric acid and 3 parts of modified polycarbonate.
A preparation method of a compression-resistant noise-reducing asphalt cement comprises the following steps:
(1) Dissolving epoxy chloropropane in 1.5mol/L sodium hydroxide solution with the mass 5 times that of the epoxy chloropropane, uniformly mixing, adding glass fiber with the mass 1 time that of the epoxy chloropropane and the diameter of 10 mu m, reacting for 12h at 25 ℃, washing for 3 times by using deionized water after the reaction, and preparing pre-modified glass fiber;
(2) Dissolving polyethyleneimine in anhydrous ethanol with the mass of 10 times that of the polyethyleneimine, uniformly mixing, adding pre-glass fiber with the mass of 1 time that of the polyethyleneimine, reacting for 24 hours at 80 ℃, performing oscillation washing with 95% ethanol at 30 ℃, then placing in a blast drying oven, and drying for 5 hours at 40 ℃ to obtain modified glass fiber;
(3) Heating polycarbonate to 240 ℃, preserving heat for 30min, adding modified glass fiber with the mass 1.2 times that of the polycarbonate, carrying out magnetic stirring, and stirring at the rotating speed of 1000rpm for 10min to obtain pre-modified polycarbonate; grinding the multi-walled carbon nanotubes to 50 meshes, continuously adding the multi-walled carbon nanotubes with the mass 1.2 times that of the polycarbonate into the pre-modified polycarbonate, carrying out magnetic stirring, stirring at the rotating speed of 1000rpm for 10min to prepare modified polycarbonate, and keeping the temperature for later use;
(4) Heating petroleum asphalt to 240 ℃, adding polyphosphoric acid, stirring for 3h at 400rpm, adding modified polycarbonate, stirring and developing for 1h at 400rpm, wherein the mass ratio of the petroleum asphalt to the polyphosphoric acid to the modified polycarbonate is 100:3:3, preparing the compression-resistant noise-reducing asphalt cement.
Comparative example 3
The compression-resistant noise-reducing asphalt cement mainly comprises the following components in parts by weight:
100 parts of petroleum asphalt, 3 parts of polyphosphoric acid and 3 parts of modified polycarbonate.
A preparation method of the compression-resistant noise-reduction asphalt cement comprises the following steps:
(1) Heating petroleum asphalt to 240 ℃, adding polyphosphoric acid, stirring for 3h at 400rpm, adding polycarbonate, stirring and developing for 1h at 400rpm, wherein the mass ratio of the petroleum asphalt to the polyphosphoric acid to the polycarbonate is 100:0.5:3, preparing the compression-resistant noise-reducing asphalt cement.
Examples of effects
Table 1 below gives the results of the analysis of the performance of the compression and noise reduction asphalt binders according to examples 1 and 2 and comparative examples 1, 2 and 3.
TABLE 1
| Noise (dB) | Degree of spread (°) | Softening Point (. Degree. C.) | PI | |
| Example 1 | 70.3 | 16.4 | 93 | 21.6 |
| Example 2 | 69.9 | 16.6 | 95 | 20.4 |
| Comparative example 1 | 77.1 | 4.4 | 77 | 15.4 |
| Comparative example 2 | 78.4 | 5.8 | 69 | 11.6 |
| Comparative example 3 | 80 | 0 | 70 | 5.9 |
Compared with the experimental data of comparative examples 1, 2 and 3 in table 1, it can be obviously found that the compression-resistant and noise-reduction asphalt cement prepared in examples 1 and 2 has strong noise reduction performance, high softening point temperature and PI index greater than 0, which proves that the product has slow aging performance and better high temperature performance, and the modified polycarbonate prepared in the examples forms modified polycarbonate with a ring structure and irregularly and mutually surrounding, the structure not only enhances the impact strength of the polycarbonate, and after the modified polycarbonate is blended with petroleum asphalt, pores in the modified polycarbonate are sealed by the petroleum asphalt to form a fine closed space, so that the product has sound absorption and noise reduction performance, and simultaneously improves the high temperature performance, and because the active sites in the polyphosphoric acid petroleum asphalt molecules react, and the asphalt matrix is uniformly dispersed, the generation of groups such as carbonyl and sulfonyl groups is slowed down, and the like, thereby delaying the aging of the product; the high degree of extension at 5 ℃ proves that the product has good low temperature, which shows that polyphosphoric acid reacts with active sites in petroleum asphalt molecules to break up asphaltene clusters and enhance the dispersion degree of asphaltenes, modified polycarbonate is added into the petroleum asphalt with uniformly dispersed asphaltenes, and the other end of polyphosphoric acid is grafted on the modified polycarbonate to gradually change the discrete modified polycarbonate into a long cross-linked chain, thereby forming a flocculent polymer network on a microcosmic, forming a stable space network in the petroleum asphalt, enabling the petroleum asphalt and the modified polycarbonate to be tightly combined, and reducing the brittleness of the petroleum asphalt and improving the low-temperature performance of the asphalt cement by virtue of the flocculent soft modified polycarbonate.
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. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (7)
1. The compression-resistant noise-reducing asphalt cement is characterized by mainly comprising the following raw material components in parts by weight: 100-200 parts of petroleum asphalt, 3-10 parts of polyphosphoric acid and 3-10 parts of modified polycarbonate; the modified polycarbonate is prepared by blending carboxylated carbon nanotubes, modified glass fibers and polycarbonate; the modified glass fiber is prepared by grafting epoxy groups on the surface of the glass fiber and then grafting polyethyleneimine.
2. The compression-resistant noise-reducing asphalt cement as claimed in claim 1, wherein the petroleum asphalt is petroleum asphalt with an asphaltene content of 60-70%.
3. The preparation method of the compression-resistant noise-reducing asphalt cement as claimed in claim 1, wherein the preparation method of the compression-resistant noise-reducing asphalt cement comprises the following steps: preparing modified glass fiber, preparing carboxylated carbon nano tube, preparing modified polycarbonate, and preparing the compression-resistant noise-reducing asphalt cement.
4. The preparation method of the compression-resistant noise-reduction asphalt cement as claimed in claim 3, characterized by comprising the following specific steps:
(1) Dissolving epoxy chloropropane in 1.5mol/L sodium hydroxide solution which is 5-8 times of the mass of epoxy chloropropane, uniformly mixing, adding glass fiber which is 1-3 times of the mass of epoxy chloropropane, reacting for 12h at 25 ℃, and washing for 3-5 times by using deionized water after reaction to prepare pre-modified glass fiber;
(2) Dissolving polyethyleneimine into absolute ethyl alcohol with the mass being 10 times that of the polyethyleneimine, uniformly mixing, adding pre-glass fiber with the mass being 1-2 times that of the polyethyleneimine, reacting at 80 ℃ for 24 hours, oscillating and washing with 95% ethanol at 30 ℃, then placing into a blast drying oven, and drying at 40 ℃ for 5-8 hours to obtain modified glass fiber;
(3) Mixing a multi-walled carbon nanotube, sodium nitrate and 30% hydrogen peroxide by mass ratio, heating in a water bath to 60 ℃, carrying out reflux reaction for 30min, cooling to room temperature, washing for 2-3 times by using a 5% hydrochloric acid solution by mass fraction, centrifuging, washing by using deionized water until the washing solution is neutral, and drying at 70 ℃ to constant weight to obtain a carboxylated carbon nanotube;
(4) Heating polycarbonate to 240 ℃, preserving heat for 30min, adding modified glass fiber with the mass 1.2-1.3 times of that of the polycarbonate, carrying out magnetic stirring, and stirring at the rotating speed of 1000rpm for 10min to prepare pre-modified polycarbonate; grinding the carboxylated carbon nano tubes to 50-100 meshes, continuously adding the carboxylated carbon nano tubes with the mass 1.2-1.3 times that of the polycarbonate into the pre-modified polycarbonate, carrying out magnetic stirring, stirring at the rotating speed of 1000rpm for 10min to prepare modified polycarbonate, and keeping the temperature for later use;
(5) Heating the petroleum asphalt to 240 ℃, adding polyphosphoric acid, stirring for 3-5 h at 400-800 rpm, adding modified polycarbonate, and stirring and developing for 1-2 h at 400-800 rpm to prepare the compression-resistant noise-reduction asphalt cement.
5. The method for preparing asphalt cement with compression and noise reduction functions according to claim 4, wherein in the step (1): the diameter of the glass fiber is 10-50 μm.
6. The method for preparing asphalt cement with compression and noise reduction functions according to claim 4, wherein in the step (3): the mass ratio of the multi-wall carbon nano tube, the sodium nitrate and the 30% hydrogen peroxide is 1:1:20.
7. the method for preparing asphalt cement with compression and noise reduction functions according to claim 4, wherein in the step (5): the mass ratio of the petroleum asphalt to the polyphosphoric acid to the modified polycarbonate is 100:3:3 to 100:5:5.
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