CN112011091A - Compound modifier, compound modified ultraviolet aging resistant asphalt and preparation method thereof - Google Patents
Compound modifier, compound modified ultraviolet aging resistant asphalt and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a compound modifier, compound modified ultraviolet aging resistant asphalt and a preparation method thereof, wherein the compound modifier is prepared by compounding a hindered amine light stabilizer and organic bentonite, and the addition mass ratio of the hindered amine light stabilizer to the organic bentonite is 1: (4-17), the compound modified ultraviolet aging resistant asphalt is prepared by carrying out compound modification on asphalt by adopting the compound modifier. The invention adopts hindered amine light stabilizer and organic bentonite to carry out compound modification on asphalt: the hindered amine light stabilizer has good ultraviolet light absorption effect; the organic bentonite has a certain shielding effect on ultraviolet light, and the lamellar structure subjected to organic treatment has strong adhesion to asphalt, so that the agglomeration problem of modifier powder in the asphalt is effectively solved; therefore, the ultraviolet aging resistance of the asphalt is improved, the rheological property of the modifier to the asphalt is improved, the service life of the asphalt pavement is prolonged, and the asphalt pavement has wide application prospects.
Description
Technical Field
The invention relates to the technical field of road engineering materials, in particular to a compound modifier, compound modified ultraviolet aging resistant asphalt and a preparation method thereof.
Background
Asphalt pavement is widely used due to its excellent road performance, comfortable driving, and easy maintenance. However, asphalt, which is an organic substance composed of hydrocarbons and derivatives thereof, is susceptible to aging caused by natural factors such as heat, oxygen, and light, especially under the ultraviolet radiation condition. Because of the high energy of ultraviolet light and light wave, a large number of weak bonds with lower bond energy in the asphalt are easy to break by light radiation, so that the asphalt is aged, hardened and brittle, and the low-temperature anti-cracking performance and the anti-fatigue performance are greatly reduced, thereby the asphalt pavement is easier to generate diseases such as cracks, pits, whitening and the like, and the service life is greatly shortened.
The modification of the asphalt by the modifier is an effective way for improving the ultraviolet aging resistance of the asphalt. The Chinese invention patent No. 201110068790.3 'magnesium aluminum base layered double hydroxide anti-aging road asphalt and a preparation method thereof' discloses that magnesium aluminum base layered double hydroxide is used as an ultraviolet shielding agent to modify asphalt so as to improve the anti-ultraviolet aging performance of the asphalt. However, the modifier is inorganic powder, easy to agglomerate and poor in compatibility with asphalt, so that the ultraviolet protection effect of the modifier on the asphalt is influenced. The Chinese invention patent No. 201710096163.8 'lignin grafted magnalium-based layered double hydroxide modifier, ultraviolet aging resistant asphalt and a preparation method thereof' adopts the grafting of lignin and magnalium-based layered double hydroxide to improve the compatibility of the modifier and the asphalt. However, the modifier needs to be chemically modified while modifying the asphalt, so that the modification process of the asphalt is increased, and the method is not beneficial to large-scale popularization in the field of engineering materials.
In conclusion, the method of modifying asphalt by simply adopting an ultraviolet shielding agent is inevitably limited by the compatibility of the modifying agent and the asphalt to influence the ultraviolet protection effect, and the modification process is obviously increased by chemically modifying the modifying agent on the basis of the former method.
Disclosure of Invention
The invention aims to provide a compound modifier, compound modified ultraviolet aging resistant asphalt and a preparation method thereof, which can improve the ultraviolet aging resistance of the asphalt.
In order to achieve the purpose, the compound modifier designed by the invention is prepared by compounding a hindered amine light stabilizer and organic bentonite, wherein the adding mass ratio of the hindered amine light stabilizer to the organic bentonite is 1: (4-17).
In order to achieve the purpose, the compound modified ultraviolet aging resistant asphalt designed by the invention is prepared by carrying out compound modification on asphalt by adopting the compound modifier.
Preferably, the asphalt is styrene-butadiene-styrene triblock copolymer modified asphalt.
Preferably, the adding proportion of the hindered amine light stabilizer is 0.3-0.6% of the mass ratio of the asphalt.
Preferably, the organic bentonite is added in a proportion of 2.5 to 5% by mass of the asphalt.
Preferably, the hindered amine light stabilizer is added in a proportion of 0.6% by mass of the asphalt, and the organobentonite is added in a proportion of 5% by mass of the asphalt.
Preferably, the hindered amine light stabilizer is added in an amount of 0.3% by mass of the asphalt, and the organobentonite is added in an amount of 2.5% by mass of the asphalt.
Preferably, the hindered amine light stabilizer is added in an amount of 0.3% by mass of the asphalt, and the organobentonite is added in an amount of 5% by mass of the asphalt.
In order to achieve the purpose, the preparation method of the compound modified ultraviolet aging resistant asphalt comprises the following steps: (1) preparing styrene-butadiene-styrene triblock copolymer modified asphalt, hindered amine light stabilizer and organic bentonite according to a predetermined proportion; (2) heating SBS pitch to a molten state and then preserving heat; (3) pouring SBS pitch into the pre-shearing device; (4) and (2) adding the organobentonite and the hindered amine light stabilizer in the step (1) in sequence, and shearing for a preset time.
Preferably, in the step (1), the proportion of the hindered amine light stabilizer is 0.3 to 0.6% of the mass ratio of the asphalt, and the proportion of the organobentonite is 2.5 to 5% of the mass ratio of the asphalt.
Preferably, in the step (2), the styrene-butadiene-styrene triblock copolymer modified asphalt is heated to 135 ℃ +/-5 ℃ and the holding time is 2 hours.
Preferably, in the step (3), the pre-shearing rate is 4000rpm to 5000rpm, the pre-shearing time is 30min, and the temperature is maintained at 160 ℃ ± 5 ℃ while the pre-shearing is performed.
Preferably, in the step (4), the organic bentonite is added while maintaining the shear rate at 4000 rpm-5000 rpm, and the mixture is added and then sheared for 30 min; when the hindered amine light stabilizer is added, the shearing rate is reduced to 1000 rpm-2000 rpm, and the hindered amine light stabilizer is added and then sheared for 15 min.
The invention has the beneficial effects that: the invention relates to a compound modifier, compound modified ultraviolet aging resistant asphalt and a preparation method thereof, wherein hindered amine light stabilizer and organic bentonite are adopted to compound and modify asphalt: the hindered amine light stabilizer is an ultraviolet light absorber and has good ultraviolet light absorption effect; the organic bentonite has certain shielding effect on ultraviolet light as organic powder with a lamellar structure, and in addition, the organic bentonite has strong adhesion to asphalt due to the lamellar structure of organic treatment, so that the problem of agglomeration of modifier powder in the asphalt is effectively solved. Therefore, the organic bentonite and the hindered amine light stabilizer are used for carrying out compound modification on SBS asphalt, the ultraviolet aging resistance of the asphalt is improved, meanwhile, the rheological property of the modifier in the asphalt is improved, the service life of the asphalt pavement is prolonged, and the application prospect is wide.
Drawings
FIG. 1 shows the ultraviolet-visible spectra (wherein, the absorbance is A, and the Wavelength is wavelet) of the hindered amine light stabilizer, the organic bentonite and the compound modifier.
Fig. 2 shows the uv-vis spectra (wherein, the reflectance is represented by R and the Wavelength is represented by Wavelength) of the hindered amine light stabilizer, the organobentonite and the compound modifier.
FIG. 3 is an aging index-Frequency curve (wherein, the aging index is AI and the Frequency is Frequency) of the hindered amine light stabilizer, the organic bentonite and the compound modified asphalt.
FIG. 4 is a graph showing the composite dynamic modulus and phase angle of the compounded modified asphalt and the unmodified asphalt at 60 ℃.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments.
According to research, the ultraviolet protection mechanism of the modifier is physically ultraviolet absorption and ultraviolet shielding by analyzing the ultraviolet protection mechanism of the modifier to the asphalt. Although researches show that multiple mechanism effects including the ultraviolet aging resistance mechanism and the ultraviolet aging resistance mechanism exist in the modified asphalt, the single use of one modifier is necessarily limited by the upper limit of the effect of the single modification mechanism, the modification of the single modifier is only improved in the effect of the single modification mechanism, and the modification mechanism cannot be fundamentally broken through.
Based on the research results, the compound modified ultraviolet aging resistant asphalt and the preparation method thereof seek to adopt two modifiers for compounding, and the two modifiers are considered in the modification mechanism by adjusting different compounding proportions, so that the synergistic effect of the two modifiers is exerted to a greater extent. The invention relates to a compound modified ultraviolet aging resistant asphalt and a preparation method thereof, wherein modifiers are respectively hindered amine light stabilizer and organic bentonite, wherein: the hindered amine light stabilizer has hindered amine functional groups, the functional groups absorb light energy to be converted into nitroxide free radicals (NO.), the nitroxide free radicals can capture alkyl active free radicals generated in the photooxidative degradation of asphalt molecules, so that the hindered amine light stabilizer has the functions of light stabilization, ultraviolet absorption and oxidation resistance, and the light stability effect is 2-4 times that of the traditional light stabilizer; the organic bentonite has an anti-ultraviolet aging effect due to the laminated structure capable of effectively shielding ultraviolet radiation, and in addition, the characteristic of easy blending with polymer enhances the asphalt force extensibility. The two modifiers have obvious effects on physical ultraviolet absorption and ultraviolet shielding, so the compound modifier, the compound modified ultraviolet aging resistant asphalt and the preparation method thereof select the two modifiers for compound modification.
Example 1:
from the analysis of the ultraviolet protection mechanism of the modifier to the asphalt, the ultraviolet protection mechanism of the modifier has two physical ultraviolet absorption mechanisms and ultraviolet shielding mechanisms. The addition mass ratio of the hindered amine light stabilizer to the organic bentonite is 1: (4-17), the compound modifier has better ultraviolet absorption and ultraviolet shielding effects. In order to better illustrate the ultraviolet protection effect of the hindered amine light stabilizer, the organic bentonite and the compound modifier, ultraviolet-visible spectrum tests are carried out on the hindered amine light stabilizer, the organic bentonite and the compound modifier, and the test results are shown in fig. 1 and fig. 2. Wherein the mass ratio of the hindered amine light stabilizer to the organic bentonite adopted by the compound modifier is 1: 17. because the light band of the ultraviolet light which has obvious aging effect on the asphalt is within the range of 200nm-400nm, the ultraviolet band (200nm-400nm) is analyzed according to the spectrogram.
FIG. 1 is a graph of absorbance vs. wavelength spectrum with two modifiers having higher absorbance values primarily in the ultraviolet (200nm-400nm) band. The hindered amine light stabilizer has high absorbance for stronger short-wave ultraviolet light (200nm-230nm), which shows that the hindered amine light stabilizer has strong absorption capacity for the short-wave ultraviolet light, and the organic bentonite has high absorption capacity for the ultraviolet light in a wave band of 230nm-400 nm. After the two modifiers are compounded, the compounded modifier has the absorbance value higher than that of the two modifiers within the wave band range of 200-400nm, so that the synergistic effect after compounding is achieved.
FIG. 2 is a spectrum of reflectance versus wavelength, with higher reflectance indicating greater physical shielding of the modifier from UV light. Compared with hindered amine light stabilizers, the organic bentonite has higher reflectivity in a wave band of 250nm-400nm, and the ultraviolet shielding effect is better. After the two modifiers are compounded, the compounded modifier has reflectance values higher than those of the two modifiers within the wave band range of 200-400nm, so that the synergistic effect after compounding is achieved.
Example 2:
the compound modified ultraviolet aging resistant asphalt of the embodiment adopts hindered amine light stabilizer with the compound proportion (accounting for the mass ratio of the asphalt) of 0.6 percent and organic bentonite with the compound proportion (accounting for the mass ratio of the asphalt) of 5 percent, and the preparation method comprises the following steps:
(1) styrene-butadiene-styrene triblock copolymer modified asphalt (SBS asphalt, the same applies below), hindered amine light stabilizer and organic bentonite are prepared according to a predetermined proportion. The adding proportion of the hindered amine light stabilizer is 0.6 percent of the mass ratio of the asphalt, and the adding proportion of the organic bentonite is 5 percent of the mass ratio of the asphalt.
(2) And heating SBS pitch to a molten state and then preserving heat. SBS pitch is heated to 135 + -5 deg.C for 2 hr.
(3) Pouring SBS pitch into a shearing barrel for pre-shearing. Starting a high-speed shearing instrument to pre-shear for 30min at the shearing rate of 4000-5000 rpm, and simultaneously keeping the temperature stable at 160 +/-5 ℃.
(4) And after the pre-shearing is finished, sequentially adding organic bentonite and hindered amine light stabilizer in a predetermined ratio, and shearing for a certain time to obtain the ultraviolet aging resistant asphalt. When the organic bentonite is added, the shearing rate is kept at 4000 rpm-5000 rpm, and the mixture is sheared for 30min after the organic bentonite is added; when the hindered amine light stabilizer is added, the shearing rate is reduced to 1000 rpm-2000 rpm, and the mixture is sheared for 15min after being added.
The reason why the organobentonite is added first and then the hindered amine light stabilizer is added in the step (4) is that: because the hindered amine light stabilizer is an organic matter, the hindered amine light stabilizer is more prone to aging under high temperature conditions, and the performance of the hindered amine light stabilizer is affected, so that the time of the hindered amine light stabilizer added later under the high temperature conditions can be shortened, the hindered amine light stabilizer is prevented from aging under the high temperature conditions for a long time, and the performance of the hindered amine light stabilizer is finally ensured.
To prove that the compound modification effect of the compound modified ultraviolet aging resistant asphalt of the embodiment is superior to the single modification effect and the unmodified effect, three groups of comparison samples are set, which are respectively: SBS asphalt modified by hindered amine light stabilizer and other dosage; SBS asphalt modified by organic bentonite with equal dosage; unmodified SBS pitch. The ultraviolet aging-resistant asphalt and the control sample were subjected to an ultraviolet accelerated aging test (ultraviolet intensity of 26W/m2, temperature of 60 ℃ and aging time of 10 days, the same applies below).
Meanwhile, in order to evaluate the ultraviolet aging resistance of the compound modified ultraviolet aging resistant asphalt of the embodiment, penetration (25 ℃), ductility (5 ℃) and Brookfield viscosity (135 ℃) are selected as evaluation indexes, and the hardness and consistency, low-temperature crack resistance and rheological property of the asphalt can be reflected; the test results of the evaluation indexes are shown in Table 1.
TABLE 1 Performance Change before and after UV aging of Compound modified asphalt samples and control samples
A is hindered amine light stabilizer, B is organic bentonite
As can be seen from Table 1, after ultraviolet aging, the residual penetration ratio and the residual ductility ratio of the two single modified asphalt comparison samples are both greater than the comparison sample value of the unmodified asphalt, and the residual penetration ratio and the residual ductility ratio of the compound modified asphalt are both greater than the comparison sample value of the two single modified asphalt; the viscosity aging indexes of the two single modified asphalt comparison samples are smaller than the comparison sample value of the unmodified asphalt, and the viscosity aging indexes of the compounded modified asphalt are both smaller than the comparison sample value of the two single modified asphalt; the single modification has a certain ultraviolet aging resistant effect on the asphalt, and after the single modification and the asphalt are compounded, the ultraviolet aging resistant effect is effectively improved, and a synergistic effect is achieved.
Example 3:
the compounding proportion of the hindered amine light stabilizer adopted in the compound modified ultraviolet aging resistant asphalt of the embodiment is (in terms of asphalt mass ratio) 0.3%, and the compounding proportion of the organic bentonite is (in terms of asphalt mass ratio) 2.5%. The preparation method comprises the following steps:
(1) SBS asphalt, hindered amine light stabilizer and organic bentonite are prepared according to a preset proportion. The adding proportion of the hindered amine light stabilizer is 0.3 percent of the mass ratio of the asphalt, and the adding proportion of the organic bentonite is 2.5 percent of the mass ratio of the asphalt.
(2) And heating SBS pitch to a molten state and then preserving heat. SBS pitch is heated to 135 +/-5 ℃ and the heat preservation time is 2 hours.
(3) Pouring SBS pitch into a shearing barrel for pre-shearing. Starting a high-speed shearing instrument and pre-shearing for 30min at the shearing rate of 4000-5000 rpm, and simultaneously keeping the temperature stable at 160 +/-5 ℃.
(4) After the pre-shearing is finished, adding organic bentonite and hindered amine light stabilizer in a specified proportion in sequence and shearing for a certain time to obtain the ultraviolet aging resistant asphalt. When the organic bentonite is added, the shearing rate is kept at 4000 rpm-5000 rpm, and the mixture is sheared for 30min after the organic bentonite is added; when the hindered amine light stabilizer is added, the shearing rate is reduced to 1000 rpm-2000 rpm, and the mixture is sheared for 15min after being added.
To prove that the compound modification effect of the compound modified ultraviolet aging resistant asphalt of the embodiment is superior to the single modification effect and the unmodified effect, three groups of comparison samples are set, which are respectively: SBS asphalt modified by hindered amine light stabilizer and other dosage; SBS asphalt modified by organic bentonite with equal dosage; unmodified SBS pitch. The ultraviolet aging resistant asphalt and the comparative sample were subjected to an ultraviolet accelerated aging test, and then the penetration (25 ℃), the ductility (5 ℃) and the Brookfield viscosity (135 ℃) were respectively tested, and the test results are shown in Table 2.
TABLE 2 Performance Change before and after UV aging of the compounded modified asphalt sample and the control sample
A is hindered amine light stabilizer, B is organic bentonite
As can be seen from Table 2, after the ultraviolet aging, the residual penetration ratio and the residual ductility ratio of the two single modified asphalt comparison samples are both greater than the comparison sample value of the unmodified asphalt, and the residual penetration ratio and the residual ductility ratio of the compound modified asphalt are both greater than the comparison sample value of the two single modified asphalt; the viscosity aging indexes of the two single modified asphalt comparison samples are smaller than the comparison sample value of the unmodified asphalt, and the viscosity aging indexes of the compounded modified asphalt are both smaller than the comparison sample value of the two single modified asphalt; the single modification has a certain ultraviolet aging resistant effect on the asphalt, and after the single modification and the asphalt are compounded, the ultraviolet aging resistant effect is effectively improved, and a synergistic effect is achieved.
Example 4:
the compounding proportion of the hindered amine light stabilizer adopted in the compound modified ultraviolet aging resistant asphalt of the embodiment is (in terms of asphalt mass ratio) 0.3%, and the compounding proportion of the organic bentonite is (in terms of asphalt mass ratio) 5%. The preparation method comprises the following steps:
(1) SBS asphalt, hindered amine light stabilizer and organic bentonite are prepared according to a preset proportion. The adding proportion of the hindered amine light stabilizer is 0.3 percent of the mass ratio of the asphalt, and the adding proportion of the organic bentonite is 5 percent of the mass ratio of the asphalt.
(2) And heating SBS pitch to a molten state and then preserving heat. SBS pitch is heated to 135 + -5 deg.C for 2 hr.
(3) Pouring SBS pitch into a shearing barrel for pre-shearing. Starting a high-speed shearing instrument and pre-shearing for 30min at the shearing rate of 4000-5000 rpm, and simultaneously keeping the temperature stable at 160 +/-5 ℃.
(4) After the pre-shearing is finished, adding organic bentonite and hindered amine light stabilizer in a specified proportion in sequence and shearing for a certain time to obtain the ultraviolet aging resistant asphalt. When the organic bentonite is added, the shearing rate is kept at 4000 rpm-5000 rpm, and the mixture is sheared for 30min after the organic bentonite is added; when the hindered amine light stabilizer is added, the shearing rate is reduced to 1000 rpm-2000 rpm, and the mixture is sheared for 15min after being added.
To prove that the compound modification effect of the compound modified ultraviolet aging resistant asphalt of the embodiment is superior to the single modification effect and the unmodified effect, three groups of comparison samples are set, which are respectively: SBS asphalt modified by hindered amine light stabilizer and other dosage; SBS asphalt modified by organic bentonite with equal dosage; unmodified SBS pitch. The ultraviolet aging resistant asphalt and the comparative sample were subjected to an ultraviolet accelerated aging test, and then the penetration (25 ℃), the ductility (5 ℃) and the Brookfield viscosity (135 ℃) were respectively tested, and the test results are shown in Table 3.
TABLE 3 Performance Change before and after UV aging of Compound modified asphalt samples and control samples
A is hindered amine light stabilizer, B is organic bentonite
As can be seen from Table 3, after the ultraviolet aging, the residual penetration ratio and the residual ductility ratio of the two single modified asphalt comparison samples are both greater than the comparison sample value of the unmodified asphalt, and the residual penetration ratio and the residual ductility ratio of the compound modified asphalt are both greater than the comparison sample value of the two single modified asphalt; the viscosity aging indexes of the two single modified asphalt comparison samples are smaller than the comparison sample value of the unmodified asphalt, and the viscosity aging indexes of the compounded modified asphalt are both smaller than the comparison sample value of the two single modified asphalt; the single modification has a certain ultraviolet aging resistant effect on the asphalt, and after the single modification and the asphalt are compounded, the ultraviolet aging resistant effect is effectively improved, and a synergistic effect is achieved.
Example 5:
the compounding proportion of the hindered amine light stabilizer adopted in the compound modified ultraviolet aging resistant asphalt of the embodiment is (in terms of asphalt mass ratio) 0.6%, and the compounding proportion of the organic bentonite is (in terms of asphalt mass ratio) 5%. The preparation method comprises the following steps:
(1) SBS asphalt, hindered amine light stabilizer and organic bentonite are prepared according to a preset proportion. The adding proportion of the hindered amine light stabilizer is 0.6 percent of the mass ratio of the asphalt, and the adding proportion of the organic bentonite is 5 percent of the mass ratio of the asphalt.
(2) And heating SBS pitch to a molten state and then preserving heat. SBS pitch is heated to 135 + -5 deg.C for 2 hr.
(3) Pouring SBS pitch into a shearing barrel for pre-shearing. Starting a high-speed shearing instrument and pre-shearing for 30min at the shearing rate of 4000-5000 rpm, and simultaneously keeping the temperature stable at 160 +/-5 ℃.
(4) After the pre-shearing is finished, adding organic bentonite and hindered amine light stabilizer in a specified proportion in sequence and shearing for a certain time to obtain the ultraviolet aging resistant asphalt. When the organic bentonite is added, the shearing rate is kept at 4000 rpm-5000 rpm, and the mixture is sheared for 30min after the organic bentonite is added; when the hindered amine light stabilizer is added, the shearing rate is reduced to 1000 rpm-2000 rpm, and the mixture is sheared for 15min after being added.
To prove the synergistic effect of the compound modifier of the compound modified ultraviolet aging resistant asphalt of the embodiment on the rheological property of SBS asphalt, the SBS asphalt modified by the single modifier is set as a comparison sample, the preparation conditions are the same as that of the SBS asphalt, and the rheological property test is carried out on the compound modified SBS asphalt and the comparison sample. The test method comprises the following steps: frequency scanning tests are carried out on two kinds of single modified SBS asphalt before and after 10 days of ultraviolet aging and three kinds of asphalt of the compound modified ultraviolet aging resistant asphalt of the embodiment by adopting a dynamic shear rheometer, wherein the test mode is a constant strain loading mode, the constant strain is 0.1%, the frequency scanning range is 0.1 Hz-100 Hz, and the temperature points are set to be 20 ℃, 30 ℃, 40 ℃, 50 ℃ and 60 ℃. And processing the final data to obtain a main rheological property curve, wherein the reference temperature of the main rheological property curve is 20 ℃.
As the main curve of the rheological property of the asphalt integrates the rheological property data of different temperature points, the rheological property of the asphalt can be reflected in a wider frequency domain, and the final influence of the aging of the asphalt also acts on the rheological property of the asphalt, the main curve of the asphalt is analyzed, and the anti-aging property of the asphalt can be evaluated from the rheological angle.
In order to express the change condition of the main curve data before and after asphalt aging more intuitively, the embodiment defines an Aging Index (AI), which is defined in the formula (r):
in the formula:
AI-aging index;
The modulus of the asphalt after aging is obviously increased, and the aging index can well reflect the change condition of the composite modulus in the main curve. As can be seen from the definition of the formula I, the higher the aging degree of the asphalt is, the higher the index is, and similarly, the lower the aging index is, the better the aging resistance of the asphalt is. The aging index-frequency curve obtained after the above data processing is shown in fig. 3.
From the curve analysis of fig. 3, it can be seen that the compound modified ultraviolet aging resistant asphalt of the present embodiment has the lowest aging index in the full frequency domain, and the aging resistance is superior to that of asphalt modified by two single modifiers. In addition, the data of two kinds of single modifier modified asphalt are compared, so that the organic bentonite has lower aging index in a low frequency domain, and the rheological property of the organic bentonite in the low frequency domain is more stable. According to the time-temperature equivalence principle: the low frequency domain data corresponds to high temperature performance, so the high temperature rheological properties of the organobentonite are more stable. Similarly, the hindered amine light stabilizer has a low aging index in a high frequency domain and stable low-temperature performance. The compound modified ultraviolet aging resistant asphalt provided by the invention integrates the advantages of two single modifiers in different frequency domains, and exerts the synergistic effect which the single modifier does not have.
Example 6:
the compounding proportion of the hindered amine light stabilizer adopted in the compound modified ultraviolet aging resistant asphalt of the embodiment is (in terms of asphalt mass ratio) 0.3%, and the compounding proportion of the organic bentonite is (in terms of asphalt mass ratio) 2.5%. The preparation method comprises the following steps:
(1) SBS asphalt, hindered amine light stabilizer and organic bentonite are prepared according to a preset proportion. The adding proportion of the hindered amine light stabilizer is 0.3 percent of the mass ratio of the asphalt, and the adding proportion of the organic bentonite is 2.5 percent of the mass ratio of the asphalt.
(2) And heating SBS pitch to a melting temperature and then preserving heat. SBS pitch is heated to 135 + -5 deg.C for 2 hr.
(3) Pouring SBS pitch into a shearing barrel for pre-shearing. Starting a high-speed shearing instrument and pre-shearing for 30min at the shearing rate of 4000-5000 rpm, and simultaneously keeping the temperature stable at 160 +/-5 ℃.
(4) After the pre-shearing is finished, adding organic bentonite and hindered amine light stabilizer in a specified proportion in sequence and shearing for a certain time to obtain the ultraviolet aging resistant asphalt. When the organic bentonite is added, the shearing rate is kept at 4000 rpm-5000 rpm, and the mixture is sheared for 30min after the organic bentonite is added; when the hindered amine light stabilizer is added, the shearing rate is reduced to 1000 rpm-2000 rpm, and the mixture is sheared for 15min after being added.
In order to prove the improvement effect of the compound modifier of the compound modified ultraviolet aging resistant asphalt on the rheological property of SBS asphalt, an unmodified SBS asphalt comparison sample is arranged, and the preparation conditions are the same as that of SBS asphalt. The rheological property test (the test temperature is 60 ℃) is carried out on the compound modified ultraviolet aging resistant asphalt and the comparison sample, and the test result is shown in fig. 4.
Compared with the two phases, the compound modified ultraviolet aging resistant asphalt of the embodiment has higher composite dynamic modulus at 60 ℃ and lower phase angle, and the high-temperature anti-rutting performance of the asphalt is more excellent, which shows that the addition of the modifier can improve the rheological property of the asphalt.
In conclusion, the compound modifier, the compound modified ultraviolet aging resistant asphalt and the preparation method thereof adopt the organic bentonite and the hindered amine light stabilizer to carry out compound modification on the SBS asphalt: the hindered amine light stabilizer is an ultraviolet light absorber and has good ultraviolet light absorption effect; the organic bentonite has certain shielding effect on ultraviolet light as organic powder with a lamellar structure, and in addition, the organic bentonite has strong adhesion to asphalt due to the lamellar structure of organic treatment, so that the problem of agglomeration of modifier powder in the asphalt is effectively solved. Therefore, the organic bentonite and the hindered amine light stabilizer are used for carrying out compound modification on the SBS asphalt, and the rheological property of the modifier in the asphalt is improved while the ultraviolet aging resistance of the asphalt is improved.
Compared with the prior art, the compound modified ultraviolet aging resistant asphalt and the preparation method thereof have the following advantages:
(1) the compound modified ultraviolet aging resistant asphalt adopts the hindered amine light stabilizer and the organic bentonite to carry out compound modification on SBS asphalt, the hindered amine light stabilizer is used as an ultraviolet light absorbent, has good ultraviolet light absorption effect, and can play a good protection role on the asphalt after modification; as organic powder with a lamellar structure, the organic bentonite has good adsorption effect on asphalt micromolecules among layers, good adhesion with asphalt and certain shielding effect on ultraviolet light due to the lamellar structure. The two modifiers are used for carrying out compound modification on SBS asphalt, and can also play a role in synergy between the two modifiers, so that the ultraviolet aging resistance of the asphalt is enhanced, and the ultraviolet aging resistance of the asphalt is obviously superior to that of the modification of a single modifier.
(2) The compound modified ultraviolet aging resistant asphalt adopts two modifiers of hindered amine light stabilizer and organic bentonite to compound SBS asphalt, and due to the organic lamellar structure of the organic bentonite, small molecules of the asphalt can be adsorbed to enter a layer, so that volatilization of light components in the asphalt is inhibited, and the rheological property of the asphalt is improved to a certain extent.
(3) The hindered amine light stabilizer and the organic bentonite modifier adopted by the compound modified ultraviolet aging resistant asphalt and the SBS asphalt raw material are mature in technology and can be directly purchased from the market, and complex chemical pretreatment on the modifiers is not needed. Therefore, the ultraviolet aging resistant asphalt has low preparation technical requirement, simple and convenient process and is beneficial to large-scale popularization and application.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (13)
1. A compound modifier is characterized in that: the light stabilizer is prepared by compounding a hindered amine light stabilizer and organic bentonite, wherein the addition mass ratio of the hindered amine light stabilizer to the organic bentonite is 1: (4-17).
2. A compound modified ultraviolet aging resistant asphalt is characterized in that: the asphalt is prepared by compounding and modifying asphalt by using the compound modifier according to claim 1.
3. The compound modified ultraviolet aging resistant asphalt of claim 2, which is characterized in that: the asphalt is styrene-butadiene-styrene triblock copolymer modified asphalt.
4. The compound modified ultraviolet aging resistant asphalt of claim 2, which is characterized in that: the adding proportion of the hindered amine light stabilizer is 0.3-0.6% of the mass ratio of the asphalt.
5. The compound modified ultraviolet aging resistant asphalt of claim 2, which is characterized in that: the addition proportion of the organic bentonite is 2.5-5% of the mass ratio of the asphalt.
6. The compound modified ultraviolet aging resistant asphalt of claim 2, which is characterized in that: the adding proportion of the hindered amine light stabilizer is 0.6 percent of the mass ratio of the asphalt, and the adding proportion of the organic bentonite is 5 percent of the mass ratio of the asphalt.
7. The compound modified ultraviolet aging resistant asphalt of claim 2, which is characterized in that: the adding proportion of the hindered amine light stabilizer is 0.3 percent of the mass ratio of the asphalt, and the adding proportion of the organic bentonite is 2.5 percent of the mass ratio of the asphalt.
8. The compound modified ultraviolet aging resistant asphalt of claim 2, which is characterized in that: the adding proportion of the hindered amine light stabilizer is 0.3 percent of the mass ratio of the asphalt, and the adding proportion of the organic bentonite is 5 percent of the mass ratio of the asphalt.
9. The preparation method of the compound modified ultraviolet aging resistant asphalt of claim 2, which comprises the following steps:
(1) preparing styrene-butadiene-styrene triblock copolymer modified asphalt, hindered amine light stabilizer and organic bentonite according to a predetermined proportion;
(2) heating SBS pitch to a molten state and then preserving heat;
(3) pouring SBS pitch into the pre-shearing device;
(4) and (2) adding the organobentonite and the hindered amine light stabilizer in the step (1) in sequence, and shearing for a preset time.
10. The preparation method of the compound modified ultraviolet aging resistant asphalt of claim 9, which is characterized by comprising the following steps: in the step (1), the proportion of the hindered amine light stabilizer is 0.3-0.6% of the mass ratio of the asphalt, and the proportion of the organic bentonite is 2.5-5% of the mass ratio of the asphalt.
11. The preparation method of the compound modified ultraviolet aging resistant asphalt of claim 9, which is characterized by comprising the following steps: in the step (2), the styrene-butadiene-styrene triblock copolymer modified asphalt is heated to 135 +/-5 ℃ and the heat preservation time is 2 hours.
12. The preparation method of the compound modified ultraviolet aging resistant asphalt of claim 9, which is characterized by comprising the following steps: in the step (3), the pre-shearing rate is 4000rpm to 5000rpm, the pre-shearing time is 30min, and the temperature is kept at 160 ℃ +/-5 ℃ while the pre-shearing is performed.
13. The preparation method of the compound modified ultraviolet aging resistant asphalt of claim 9, which is characterized by comprising the following steps: in the step (4), when the organic bentonite is added, the shearing rate is kept at 4000 rpm-5000 rpm, and the organic bentonite is sheared for 30min after being added; when the hindered amine light stabilizer is added, the shearing rate is reduced to 1000 rpm-2000 rpm, and the hindered amine light stabilizer is added and then sheared for 15 min.
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