CN113388256B - Anti-ultraviolet asphalt and preparation method and application thereof - Google Patents
Anti-ultraviolet asphalt and preparation method and application thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L95/00—Compositions of bituminous materials, e.g. asphalt, tar, pitch
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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- C08K2003/2296—Oxides; Hydroxides of metals of zinc
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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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- C08K2201/011—Nanostructured additives
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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Abstract
The invention discloses an anti-ultraviolet asphalt and a preparation method and application thereof, wherein the anti-ultraviolet asphalt is mainly prepared from the following components in parts by weight: 75-85 parts of asphalt, 3-5 parts of modifier, 3-5 parts of light shielding agent with a sandwich structure, 3-5 parts of auxiliary light shielding agent, 1-3 parts of antioxidant, 1-3 parts of anti-aging agent, 1.5-1.7 parts of ultraviolet absorbent, 1-3 parts of free radical scavenger and 0.3-0.5 part of light stabilizer. The modified material added in the anti-ultraviolet asphalt has good compatibility with asphalt, is uniformly dispersed into a continuous phase protective layer, can reflect and scatter ultraviolet rays through a double-layer inorganic light covering layer, reduces the damage of the ultraviolet rays to a road surface, has small absorption to infrared rays, can convert the absorbed ultraviolet rays into heat energy, enables the road surface to have an energy storage function, greatly improves the anti-ultraviolet capability of the asphalt road surface, and prolongs the service life of the road surface.
Description
Technical Field
The invention relates to the technical field of highway asphalt, in particular to ultraviolet-resistant asphalt and a preparation method and application thereof.
Background
The aging of asphalt is generally classified into heat aging caused by high temperature and ultraviolet aging caused by ultraviolet irradiation contained in sunlight. Photo-oxidative aging is the main cause of long-term aging of asphalt roads. Ultraviolet energy exceeds C-C and C-H bond breaking energy, weaker chemical bonds in asphalt molecules are broken to generate chemical reaction, and thus, the molecular structure is changed, and the performance is reduced. A large amount of condensed ring compounds, SBS modifiers and the like in the asphalt have strong ultraviolet absorption capacity, and undergo photolysis reaction to cause aging, thus influencing the service performance and the service life of roads. The asphalt mixture is a black material, and the ultraviolet-resistant absorbents commonly used in rubber and plastic products, such as cerium dioxide, titanium dioxide, zinc dioxide, carbon black and the like, have no obvious effect. In western regions such as Xinjiang, Tibet and the like in China, the altitude is high, the air is thin, the ultraviolet absorption radiation is particularly strong, the ultraviolet aging phenomenon can cause the temperature crack resistance and the fatigue failure resistance of the asphalt pavement to be reduced, the pavement is easy to generate diseases such as cracks, pits and the like, and the service life of the asphalt pavement is shortened.
Thus, the existing asphalt is in need of further improvement.
Disclosure of Invention
Aiming at the problems that the existing asphalt has weak ultraviolet resistance and is easy to generate ultraviolet aging, and the temperature crack resistance and fatigue failure resistance of the asphalt pavement are reduced, so that the service life of the asphalt pavement is shortened, the embodiment of the invention provides novel ultraviolet-resistant asphalt and a preparation method and application thereof. The scheme of the invention is as follows:
in a first aspect, the invention provides an anti-ultraviolet asphalt, which is prepared from the following components in parts by weight: 75-85 parts of asphalt, 3-5 parts of modifier, 3-5 parts of light shielding agent with a sandwich structure, 3-5 parts of auxiliary light shielding agent, 1-3 parts of antioxidant, 1-3 parts of anti-aging agent, 1.5-1.7 parts of ultraviolet absorbent, 1-3 parts of free radical scavenger and 0.3-0.5 part of light stabilizer.
On one hand, the ultraviolet resistant asphalt has the reflection and scattering effects of an upper inorganic light shielding layer and a lower inorganic light shielding layer formed by a light shielding agent with a sandwich structure and an auxiliary light shielding agent on ultraviolet rays, so that most of the radiated ultraviolet rays are difficult to penetrate into the material to play a light shielding effect;
on the other hand, when the ultraviolet-resistant asphalt is applied to a high-altitude area with high ultraviolet intensity, a small part of ultraviolet rays still pass through the light shielding layer and enter the ultraviolet-resistant asphalt layer, and other components in the ultraviolet-resistant asphalt act synergistically at the moment, specifically: firstly, hydroxyl, phenolic hydroxyl, quinonyl and lactone existing on the surface of the light covering layer can absorb penetrating free radicals; secondly, the organic cyclic nitrogen-containing cyclic structure and the amino structure existing in the intercalation can transfer the absorbed free radical electrons; thirdly, the light trapping agent dispersed in the material has a three-dimensional effect, can trap transmitted free radicals and decompose peroxides; fourthly, the antioxidant eliminates newly generated free radicals or promotes the decomposition of hydroperoxide; and fifthly, the ultraviolet absorbent molecules absorb UV light energy, intramolecular hydrogen bonds are broken, chelate rings are destroyed to form a metastable state ion structure, the ion structure is decomposed, intramolecular hydrogen bonds are formed after energy is released to form a circulation reaction, the effect of absorbing ultraviolet rays is continuously exerted, the energy level of the ultraviolet absorbent molecules is shifted to reach an excited state, and when the ultraviolet absorbent molecules return to the initial state, part of energy is released in the form of light energy and heat energy, so that the heat storage effect can be also realized.
Through the synergistic cooperation of the light trapping agent, the antioxidant and the ultraviolet absorbent, free radicals entering the asphalt material can be trapped and eliminated, the oxidation reaction inside the material is effectively avoided, the damage of the absorbed UV light energy to the asphalt material is reduced, and the ultraviolet aging process of the asphalt material is delayed to the greatest extent possible. On the basis, the added modified material has good compatibility with asphalt, is uniformly dispersed into a continuous phase protective layer, has small absorption to infrared rays, and converts the ultraviolet ray absorbed part into heat energy, so that the pavement has an energy storage function.
Preferably, the light shielding agent with the sandwich structure is self-made by the inventor and is prepared from the following components in parts by mass:
85-95 parts of layered inorganic substance, 1-3 parts of titanate coupling agent, 1-3 parts of cyanuric chloride, 1-3 parts of melamine, 1-3 parts of trioctylamine and 1-3 parts of polyethylene wax.
Specifically, the layered inorganic substance is one or more of montmorillonite, kaolin, hydrotalcite, artificial hectorite, dolomite, rectorite and sheet aluminum sulfate.
The preparation method of the light shielding agent with the sandwich structure comprises the following steps:
(1) stirring and grinding 85-95 parts by mass of layered inorganic substance, 1-3 parts by mass of titanate coupling agent and 1-3 parts by mass of cyanuric chloride at a high speed of 3000rpm for 15 minutes for intercalation;
(2) then adding 1-3 parts by mass of melamine and 1-3 parts by mass of trioctylamine, stirring and grinding at a high speed of 3000rpm for 15 minutes for layer expanding treatment to obtain composite powder;
(3) and finally, adding 1-3 parts by mass of polyethylene wax to coat the composite powder, and drying, ball-milling and sieving to obtain the light shielding agent with a sandwich structure.
Preferably, the light-shielding agent of the "sandwich" structure is used in 5000 mesh.
The action principle of the light shielding agent with the sandwich structure is as follows: the molecular space of the layered inorganic substance has larger gaps, the layered inorganic substance is composed of silica polyhedrons and other ion-doped silica polyhedrons, the particles are finer, the specific surface area is larger, and simultaneously, because the interlayer acting force is weaker, the layered inorganic substance can be stripped, expanded and separated into thinner single chips under the action of the intercalation agent. By utilizing the performance of exchangeable ions of intercalation materials (layered inorganic substances, titanate coupling agent and cyanuric chloride), organic amino ions and multi-nitrogen heterocyclic structures can be inserted to form stable intercalation and larger interlayer spacing, so that separated single chips are stably and continuously arranged in two dimensions, and a better light shielding effect is achieved. Meanwhile, partial molecules such as the UV absorbent, the light stabilizer, the light trapping agent and the like are adsorbed in the intercalation under the van der Waals force action of amino, an electron-rich structure and the like to play a role; when part of ultraviolet rays which are not shielded by the light shielding layer enter the ultraviolet-proof asphalt layer, the ultraviolet absorbent plays a role in absorbing ultraviolet rays, the generation energy level goes beyond and reaches an excited state, and when the ultraviolet-proof asphalt layer returns to the initial state, part of energy is released in the form of light energy and heat energy.
In order to match with the light shielding agent with the sandwich structure and improve the light shielding effect, the ultraviolet resistant asphalt is added with an auxiliary light shielding agent, and the auxiliary light shielding agent adopts one or more of carbon black, nano zinc oxide, nano titanium oxide, nano aluminum oxide and nano silicon dioxide. The auxiliary light shielding agent has the function of strongly reflecting ultraviolet light or absorbing ultraviolet light, and is cooperated with the light shielding agent with a sandwich structure to form an upper and lower double-layer inorganic light shielding layer, so that the ultraviolet resistance of the asphalt is further improved.
Preferably, in the above-mentioned uv-resistant asphalt, the modifier is SBS (styrene-based thermoplastic elastomer), SIS (styrene-isoprene-styrene), SEBS (linear triblock copolymer with polystyrene as a terminal segment and ethylene-butylene copolymer obtained by hydrogenation of polybutadiene as an intermediate elastic block), SBR (styrene-butadiene rubber) or PE (polyethylene).
Preferably, the asphalt is 110 asphalt, 90 asphalt or 70 asphalt. Because the ultraviolet-resistant asphalt is mainly applied to plateaus and high-altitude regions, the temperature of the application environment is lower, the requirement on the high-temperature performance of the asphalt is not high, and the low-temperature performance is emphasized. The three kinds of asphalt, especially No. 110 and No. 90, are excellent in low temperature performance in asphalt product with relatively great use amount and are more suitable for the uvioresistant asphalt of the present invention.
Preferably, in the anti-ultraviolet asphalt, the antioxidant is one or a mixture of several of antioxidant 1010, antioxidant 1076, antioxidant BHT, antioxidant CA, antioxidant 164, antioxidant DLTP, antioxidant TNP, antioxidant TPP and antioxidant MB.
Preferably, in the above ultraviolet-resistant asphalt, the antioxidant is one of antioxidant CPPD, antioxidant IPPD, antioxidant DPPD, 4' -bis (2, 2-dimethylbenzyl) diphenylamine, and antioxidant AW.
Preferably, in the ultraviolet resistant asphalt, the ultraviolet absorbent is one of phenyl ortho-hydroxybenzoate, ultraviolet absorbent UV-O, ultraviolet absorbent UV-9, ultraviolet absorbent UV-531, ultraviolet absorbent UV-327 and ultraviolet absorbent RMB.
Preferably, the radical scavenger is one of 2, 2-diphenyl-1-trinitrophenylhydrazine (DPPH), p-benzoquinone, tetramethylbenzoquinone, 2-methyl-2-nitrosomethane, and phenyl-N-tert-butylnitrone.
Preferably, in the above-mentioned ultraviolet-resistant asphalt, the light stabilizer is one of light stabilizer AM-101(2, 2 '-thiobis (4-tert-octylphenoloxy) nickel), light stabilizer GW-540 (tris (1, 2, 2, 6, 6-pentamethylpiperidinyl) phosphite), light stabilizer 744 (4-benzoyloxy-2, 2, 6, 6-tetramethylpiperidine), 2, 4, 6-tris (2' n-butoxyphenyl) -1, 3, 5-triazine, and light stabilizer HPT (hexamethylphosphoric triamide).
In a second aspect, the invention provides a preparation method of the ultraviolet-resistant asphalt, which comprises the following steps:
step one, putting a modifier, a light shielding agent with a sandwich structure and an auxiliary light shielding agent in corresponding parts by weight into a stirrer, and stirring for 30-60min at normal temperature to obtain a mixture 1;
and step two, preheating the matrix asphalt with the corresponding weight part to 190 ℃ at 180-.
In a third aspect, the invention also provides the use of the ultraviolet resistant asphalt in asphalt pavements.
The ultraviolet-resistant asphalt provided by the invention has the following beneficial effects:
1. the ultraviolet-resistant asphalt forms a double-layer inorganic light shielding layer on the surface of the asphalt through the matching of a light shielding agent with a sandwich structure and an auxiliary light shielding agent; the double-layer inorganic light shielding layer can reflect and scatter ultraviolet rays, so that most of the ultraviolet rays received by the surface of the asphalt are difficult to penetrate into the asphalt, and the light shielding effect is achieved.
Aiming at the ultraviolet rays which pass through the light covering layer and enter the ultraviolet-proof asphalt layer at a small part, other components in the ultraviolet-proof asphalt act synergistically: hydroxyl, phenolic hydroxyl, quinonyl and lactone existing on the surface of the light covering layer can absorb penetrating free radicals, an organic cyclic nitrogen-containing cyclic structure and an amino structure existing in the intercalation can transfer absorbed free radical electrons, a light trapping agent dispersed in the material has a stereoscopic effect, can trap transferred free radicals, decompose peroxides, and an antioxidant eliminates newly generated free radicals or promotes the decomposition of hydroperoxides; the ultraviolet absorbent plays a role in absorbing ultraviolet rays, the generation energy level of molecules is more shifted to reach an excited state, and when the molecules are restored to the initial state, part of energy is released in the form of light energy and heat energy, so that the heat storage function can be also played.
Through the synergistic cooperation of the light trapping agent, the antioxidant and the ultraviolet absorbent, free radicals entering the asphalt material can be trapped and eliminated, the oxidation reaction inside the material is effectively avoided, the damage of the absorbed UV light energy to the asphalt material is reduced, and the ultraviolet aging process of the asphalt material is delayed to the greatest extent possible.
2. The modified material in the ultraviolet-resistant asphalt has good compatibility with asphalt, is uniformly dispersed into a continuous phase protective layer, has small absorption to infrared rays, and converts the ultraviolet-absorbing part into heat energy, so that the pavement has an energy storage function.
3. The anti-ultraviolet asphalt has a simple formula, is easy to prepare, can be widely applied to asphalt pavements in various regions, is particularly suitable for high-altitude regions with high ultraviolet intensity, can greatly prolong the creak ageing of the pavements, improve the temperature crack resistance and fatigue failure resistance of the asphalt pavements, reduce the occurrence of pavement diseases and prolong the service life of the pavements.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the following 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.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items. The experimental procedures used in the following examples are all conventional procedures unless otherwise specified. Materials, reagents and the like used in the following examples are commercially available unless otherwise specified.
Example 1
1. The embodiment provides ultraviolet-resistant asphalt which is prepared from the following components in parts by weight:
11075 parts of asphalt, 5 parts of modifier, 5 parts of light shielding agent with a sandwich structure, 5 parts of auxiliary light shielding agent, 3 parts of antioxidant, 3 parts of anti-aging agent, 1.7 parts of ultraviolet absorber, 2 parts of free radical scavenger and 0.3 part of light stabilizer.
Wherein the modifier is SBS, the auxiliary light shielding agent is carbon black, the antioxidant is antioxidant 1010, the anti-aging agent is anti-aging agent CPPD, the ultraviolet absorbent is ultraviolet absorbent UV-531, the free radical scavenger is DPPH, and the light stabilizer is light stabilizer GW-540.
The preparation method of the light shielding agent with the sandwich structure comprises the following steps:
(1) 95 parts of layered inorganic substance, 1 part of titanate coupling agent and 1 part of cyanuric chloride are stirred and ground at a high speed of 3000rpm for 15 minutes for intercalation;
(2) then adding 1 part by mass of melamine and 1 part by mass of trioctylamine, stirring and grinding at a high speed of 3000rpm for 15 minutes for layer expanding treatment to obtain composite powder;
(3) and finally, adding 1 part by mass of polyethylene wax to coat the composite powder, and drying, ball-milling and sieving to obtain the light shielding agent with a sandwich structure.
2. The preparation method of the anti-ultraviolet asphalt comprises the following steps:
step one, putting 5 parts of modifier, 5 parts of light shielding agent with a sandwich structure and 5 parts of auxiliary light shielding agent into a stirrer, and stirring for 30min at normal temperature to obtain a mixture 1;
secondly, preheating the corresponding weight part of the matrix asphalt to 185 ℃, adding 3 parts of antioxidant, 3 parts of anti-aging agent, 1.7 parts of ultraviolet absorbent, 2 parts of radical scavenger and 0.3 part of light stabilizer into a proportioning tank, adding the mixture 1 in a continuous shearing state, and fully shearing for 3 hours at 3000rpm to obtain the ultraviolet resistant asphalt.
Example 2
1. The embodiment provides ultraviolet-resistant asphalt which is prepared from the following components in parts by weight:
9085 parts of asphalt, 3 parts of modifier, 4 parts of light-shielding agent with a sandwich structure, 3 parts of auxiliary light-shielding agent, 1 part of antioxidant, 1 part of anti-aging agent, 1.5 parts of ultraviolet absorber, 1 part of free radical scavenger and 0.5 part of light stabilizer.
Wherein the modifier is SEBS, the auxiliary light shielding agent is nano silicon dioxide, the antioxidant is antioxidant 1076, the antioxidant is antioxidant IPPD, the ultraviolet absorber is ultraviolet absorber UV-0, the free radical scavenger is p-benzoquinone, and the light stabilizer is light stabilizer 744. The light-shielding agent of the above-mentioned "sandwich" structure was prepared in the same manner as in example 1.
2. The specific preparation method of the anti-ultraviolet asphalt comprises the following steps:
step one, putting 3 parts of modifier, 4 parts of light shielding agent with a sandwich structure and 3 parts of auxiliary light shielding agent into a stirrer, and stirring for 60min at normal temperature to obtain a mixture 1;
secondly, preheating matrix asphalt with the corresponding weight parts to 180 ℃, adding 1 part of antioxidant, 1 part of anti-aging agent, 1.5 parts of ultraviolet absorbent, 1 part of radical scavenger and 0.5 part of light stabilizer with the corresponding weight parts into a batching tank, adding the mixture 1 in a continuous shearing state, and fully shearing for 2.5 hours under the condition of 3500rpm to obtain the anti-ultraviolet asphalt.
Example 3
1. The embodiment provides ultraviolet-resistant asphalt which is prepared from the following components in parts by weight:
7080 parts of asphalt, 4 parts of modifier, 3 parts of light shielding agent with a sandwich structure, 4 parts of auxiliary light shielding agent, 2 parts of antioxidant, 2 parts of anti-aging agent, 1.6 parts of ultraviolet absorber, 3 parts of free radical scavenger and 0.4 part of light stabilizer.
Wherein the modifier is SBR, the auxiliary light shielding agent is nano zinc oxide, the antioxidant is antioxidant BHT, the anti-aging agent is anti-aging agent DPPD, the ultraviolet absorbent is ultraviolet absorbent UV-9, the free radical scavenger is tetramethyl benzoquinone, and the light stabilizer is light stabilizer AM-101. The light-shielding agent of the above-mentioned "sandwich" structure was prepared in the same manner as in example 1.
2. The specific preparation method of the anti-ultraviolet asphalt comprises the following steps:
step one, putting 4 parts of modifier, 3 parts of light shielding agent with a sandwich structure and 4 parts of auxiliary light shielding agent into a stirrer, and stirring for 45min at normal temperature to obtain a mixture 1;
secondly, preheating the matrix asphalt to 190 ℃ in corresponding parts by weight, adding 2 parts of antioxidant, 2 parts of anti-aging agent, 1.6 parts of ultraviolet absorbent, 3 parts of radical scavenger and 0.4 part of light stabilizer in corresponding parts by weight into a batching tank, adding the mixture 1 in a continuous shearing state, and fully shearing for 2 hours under the condition of 4000rpm to obtain the ultraviolet resistant asphalt.
Example 4
The formulation and preparation method of the anti-ultraviolet asphalt provided in this example are the same as those of example 1, except that a different light-shielding agent of a "sandwich" structure is used, and the preparation method of the light-shielding agent of this example is as follows:
(1) stirring and grinding 85 parts by mass of layered inorganic substance, 2 parts by mass of titanate coupling agent and 2 parts by mass of cyanuric chloride at a high speed of 3000rpm for 15 minutes for intercalation;
(2) then adding 2 parts by mass of melamine and 2 parts by mass of trioctylamine, stirring and grinding at a high speed of 3000rpm for 15 minutes for layer expanding treatment to obtain composite powder;
(3) and finally, adding 2 parts by mass of polyethylene wax to coat the composite powder, and drying, ball-milling and sieving to obtain the light shielding agent with a sandwich structure.
The performance of the anti-ultraviolet asphalt prepared in this example is similar to the performance index of the anti-ultraviolet asphalt prepared in example 1, and is not described in the subsequent performance test examples.
Comparative example 1
The asphalt with the ultraviolet resistance function provided by the comparative example is the ultraviolet resistance asphalt of the example 1, the light shielding agent with a sandwich structure is omitted, other components are the same as the example 1, and the preparation method is also referred to the example 1.
Comparative example 2
The comparative example adopts the prior common SBR modified asphalt, wherein the mixing amount of the anti-aging agent is 5 percent.
Performance test examples of ultraviolet-resistant asphalt
1. The test method comprises the following steps: the performance of the ultraviolet-resistant asphalt of each embodiment and each comparative example is specifically tested by referring to a method in JTG E20-2011 road engineering asphalt and asphalt mixture test specification, wherein TFOT residue is detected by adopting a film oven test, and the specific test method is as follows:
respectively injecting asphalt samples into sample containers with the inner diameter of 140mm +/-1 mm, the wall thickness of 0.7-1.0mm and the depth of 9.5-10mm and the thickness of 50 +/-0.5 g to form films with uniform thickness, keeping a film heating oven at 163 +/-0.5 ℃, putting the sample containers on a turntable in the oven, turning on a rotary switch to enable the turntable to rotate at the speed of 5.5r/min, keeping for 5 hours in the environment to finish a film oven test, and measuring and calculating the changes of the TFOT residues, the needle penetration and the like of the asphalt samples before and after the test. The results of the assay are shown in Table 1 below.
TABLE 1 Performance testing of the UV resistant asphalts of the examples
From the experimental results of Table 1 above, it is understood that the overall performance of the asphalt samples of examples 1-3 is improved as compared with that of comparative examples 1-2; the results of the thin film oven test, however, show that the pitch samples of examples 1-3 have reduced changes in the quality of the TFOT residue, significantly improved penetration ratios, and relatively stable ductility and softening points, relative to comparative examples 1-2, i.e.: the overall performance of the asphalt samples of examples 1-3 was more stable before and after the experiment. The above results illustrate that: the ultraviolet-resistant asphalt provided by the invention has the advantages that the comprehensive performance is improved, and the high-temperature aging resistance is also obviously improved.
2. Ultraviolet aging test
The UV resistant asphalts and stones of examples 1-3 and comparative examples 1-2 were prepared into Marshall test pieces having an oilstone ratio of 5% by tapping method using Marshall test method at intervals of 0.5%, and the test pieces were cut in a size of 25.0 cm. times.3.0 cm. times.3.5 cm. In order to simulate outdoor ultraviolet aging of asphalt pavements, a self-made ultraviolet aging test box is adopted for simulation in the test, a 400W high-pressure mercury lamp is adopted as an aging lamp, an aluminum reflecting lampshade is additionally arranged, and more than 90% of ultraviolet rays can be reflected on a test piece. In addition, because ultraviolet irradiation can produce a large amount of heat on the test piece, prevent to produce the interference to the test result, consequently, adopt 100W's air-blower to blow people's cold air to the test case, through controlling the wind speed indirect control test case internal temperature and stablizing at 30 ℃ +/-2 ℃. Then, the Marshall test pieces of examples 1-3 and comparative examples 1-2 were placed in an ultraviolet aging test chamber to perform an ultraviolet aging test, and the irradiation time of a high-pressure mercury lamp was 72 hours.
Then, the three-point bending test is carried out on the marshall test pieces of each group according to the bending test procedure of the T0715-2011 asphalt mixture in the test specification of road engineering asphalt and asphalt mixture (JTG E20-2011), and the test results are shown in the following table 2:
TABLE 2 ultraviolet aging test results for various asphalt mixtures
From the results in table 2 above, it can be seen that the maximum bending strain and bending strength after the uv aging test of the asphalt mixture prepared by the asphalt of comparative examples 1 and 2 are greatly reduced, and the bending stiffness modulus is significantly improved, which reflects that the asphalt of comparative examples 1 and 2 has poor uv aging resistance and greatly reduced bending tensile strength. Compared with comparative examples 1-2, the anti-ultraviolet asphalt of examples 1-3 has stable performance after aging test, the bending tensile strength value is reduced by less than 10%, the bending tensile strength value of comparative example 1 is reduced by only 35%, and the bending tensile strength value of comparative example 2 is reduced by nearly 52%. Obviously, the ultraviolet aging resistance of the ultraviolet resistant asphalt is greatly improved, and the light shielding agent with a sandwich structure is an indispensable key component in the formula of the ultraviolet resistant asphalt.
It should be understood that the technical solutions and concepts of the present invention may be equally replaced or changed by those skilled in the art, and all such changes or substitutions should fall within the protection scope of the appended claims.
Claims (8)
1. The ultraviolet-resistant asphalt is characterized by comprising the following components in parts by weight:
75-85 parts of asphalt, 3-5 parts of modifier, 3-5 parts of light shielding agent with a sandwich structure, 3-5 parts of auxiliary light shielding agent, 1-3 parts of antioxidant, 1-3 parts of anti-aging agent, 1.5-1.7 parts of ultraviolet absorbent, 1-3 parts of free radical scavenger and 0.3-0.5 part of light stabilizer;
the preparation method of the light shielding agent with the sandwich structure comprises the following steps: stirring and grinding 85-95 parts by mass of layered inorganic substance, 1-3 parts by mass of titanate coupling agent and 1-3 parts by mass of cyanuric chloride at a high speed of 3000rpm for 10-20 minutes for intercalation; then adding 1-3 parts by mass of melamine and 1-3 parts by mass of trioctylamine, stirring and grinding at a high speed of 3000rpm for 10-20 minutes to carry out layer expanding treatment, thus obtaining composite powder; finally, adding 1-3 parts by mass of polyethylene wax to coat the composite powder, and drying, ball-milling and sieving to obtain a light shielding agent with a sandwich structure;
the layered inorganic substance is one or more of montmorillonite, kaolin, hydrotalcite, artificial hectorite, dolomite, rectorite and sheet aluminum sulfate.
2. The ultraviolet-resistant asphalt according to claim 1, wherein the auxiliary light-shielding agent is one of carbon black, nano zinc oxide, nano titanium oxide, nano aluminum oxide and nano silicon dioxide.
3. The anti-ultraviolet asphalt of claim 1, wherein the antioxidant is one or a mixture of several of antioxidant 1010, antioxidant 1076, antioxidant BHT, antioxidant CA, antioxidant 164, antioxidant DLTP, antioxidant TNP, antioxidant TPP and antioxidant MB.
4. The ultraviolet-resistant asphalt according to claim 1, wherein the antioxidant is one of antioxidant CPPD, antioxidant IPPD, antioxidant DPPD, 4' -bis (2, 2-dimethylbenzyl) diphenylamine and antioxidant AW.
5. The ultraviolet-resistant asphalt of claim 1, wherein the ultraviolet absorber is one of phenyl ortho-hydroxybenzoate, ultraviolet absorber UV-O, ultraviolet absorber UV-9, ultraviolet absorber UV-531, ultraviolet absorber UV-327 and ultraviolet absorber RMB.
6. The ultraviolet-resistant asphalt according to claim 1, wherein the radical scavenger is one of 2, 2-diphenyl-1-trinitrophenylhydrazine (DPPH), p-benzoquinone, tetramethylbenzoquinone, 2-methyl-2-nitrosomethane, and phenyl-N-tert-butylnitrone.
7. The preparation method of the ultraviolet-resistant asphalt as claimed in claim 1, characterized by comprising the following steps:
step one, putting a modifier, a light shielding agent with a sandwich structure and an auxiliary light shielding agent in corresponding parts by weight into a stirrer, and stirring for 30-60min at normal temperature to obtain a mixture 1;
and step two, preheating the asphalt with the corresponding weight part to 190 ℃ of 180-.
8. Use of the ultraviolet resistant asphalt of claim 1 in asphalt pavement.
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| CN114456609A (en) * | 2020-11-09 | 2022-05-10 | 南通通沙沥青科技有限公司 | High-grade highway anti-aging heavy traffic asphalt and preparation method thereof |
| CN114215217A (en) * | 2021-12-14 | 2022-03-22 | 武汉纺织大学 | Photo-thermal energy storage wall |
| CN114605844B (en) * | 2022-03-14 | 2023-10-13 | 广州大象超薄路面技术开发有限公司 | Ultraviolet aging resistant desulfurization rubber powder modified asphalt and preparation method thereof |
| CN116041973A (en) * | 2022-12-06 | 2023-05-02 | 同济大学 | Anti-aging asphalt and preparation method and application thereof |
| CN116496633B (en) * | 2023-05-24 | 2023-11-14 | 广东诚泰投资集团有限公司 | Ultraviolet-resistant asphalt material and preparation method thereof |
| CN117263572A (en) * | 2023-09-22 | 2023-12-22 | 聊城市交通发展有限公司 | High-ductility high-elasticity modified asphalt mixture and preparation method thereof |
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