A bio-based stabilizer material and its preparation method, a flame-retardant, odor-neutralizing, environmentally friendly, multifunctional modified asphalt and its applications

Abstract

This invention provides a bio-based stabilizer material and its preparation method, a flame-retardant, odor-neutralizing, environmentally friendly, multifunctional modified asphalt, and its applications, relating to the field of road engineering technology. The bio-based stabilizer material provided by this invention comprises biomass matrix material, vulcanization accelerator, and insoluble sulfur as raw materials; the mass ratio of the biomass matrix material, vulcanization accelerator, and insoluble sulfur is 5-30:10-20:50-100. The flame-retardant, odor-neutralizing, environmentally friendly, multifunctional modified asphalt provided by this invention, by mass fraction, comprises 70-94% petroleum asphalt, 3-10% waste plastics and waste rubber, 0.8-2.9% bio-based stabilizer material, 0.2-4.5% flame retardant, and 0.3-3.8% odor neutralizer. Using the bio-based stabilizer material provided by this invention as raw material to prepare modified asphalt not only enhances the performance of the modified asphalt but also reduces the irritating odor emitted during the production process.

Description

Technical Field

[0001] This invention relates to the field of road engineering technology, specifically to a bio-based stabilizer material and its preparation method, a flame-retardant, odor-neutralizing, environmentally friendly, multifunctional modified asphalt, and its applications. Background Technology

[0002] Due to its advantages such as short construction period, simple maintenance, and comfortable driving experience, asphalt pavement is currently the most common type of highway in my country. Hot-mix asphalt mixtures are widely used in the construction, reconstruction, expansion, and maintenance of highways due to their excellent performance.

[0003] However, hot-mix asphalt mixtures still have the following problems: To ensure good workability during construction, the asphalt mixture needs to be heated to high temperatures during hot mixing and paving. This not only results in significant energy consumption and accelerated asphalt aging, but also generates large amounts of asphalt fumes (hydrogen sulfide, benzene, toluene, xylene, and benzo[a]pyrene). Asphalt fumes not only impact the environment but also seriously threaten the health of construction workers. Large amounts of fumes dilute the oxygen in the air, causing mechanical equipment malfunctions and affecting construction progress. Summary of the Invention

[0004] The purpose of this invention is to provide a bio-based stabilizer material and its preparation method, a flame-retardant, odor-neutralizing, environmentally friendly, multifunctional modified asphalt, and its application. Using the bio-based stabilizer material provided by this invention as a raw material to prepare modified asphalt not only enhances the performance of the modified asphalt, but also inhibits the generation of hydrogen sulfide gas from the source, thereby reducing the emission of irritating odors during the production of modified asphalt, reducing environmental pollution, and ensuring worker safety.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solution:

[0006] This invention provides a bio-based stabilizer material, the raw materials for which include biomass matrix material, vulcanization accelerator and insoluble sulfur; the mass ratio of the biomass matrix material, vulcanization accelerator and insoluble sulfur is 5-30:10-20:50-100.

[0007] This invention provides a method for preparing the bio-based stabilizer material described in the above technical solution, comprising the following steps:

[0008] A biomass-based material, a vulcanization accelerator, and insoluble sulfur are mixed to obtain a bio-based stabilizer material; the mixing temperature is 180–190°C.

[0009] This invention provides a flame-retardant, odor-neutralizing, environmentally friendly, multifunctional modified asphalt. By mass fraction, the raw materials include 70-94% petroleum asphalt, 3-10% waste plastics and waste rubber, 0.8-2.9% bio-based stabilizer material as described in the above technical solution or bio-based stabilizer material prepared by the above technical solution preparation method, 0.2-4.5% flame retardant, and 0.3-3.8% odor neutralizer.

[0010] Preferably, the mass ratio of the waste plastic to the waste rubber is 2-3:1-2.

[0011] Preferably, the flame retardant is a layered halogen-free organosilicon synergistic flame retardant.

[0012] Preferably, the flame retardant is a mixture of ternary layered bimetallic hydroxide, nano-aluminum hydroxide, and silicon dioxide; the mass ratio of the ternary layered bimetallic hydroxide, nano-aluminum hydroxide, and silicon dioxide is 1-2:0.1-0.5:1-3.

[0013] Preferably, the deodorizing agent comprises biochar material and surfactant; the mass ratio of the biochar material to the surfactant is 0.5-1.9:0.2-0.6.

[0014] Preferably, the biochar material includes one of grapefruit peel biochar material, orange peel biochar material, and walnut shell biochar material.

[0015] Preferably, the surfactant includes one of amino acid surfactants, sulfonate surfactants, and betaine surfactants.

[0016] This invention provides the application of the flame-retardant, odor-neutralizing, environmentally friendly, multifunctional modified asphalt described above in asphalt concrete.

[0017] This invention provides a bio-based stabilizer material, the raw materials of which include a biomass matrix material, a vulcanization accelerator, and insoluble sulfur; the mass ratio of the biomass matrix material, vulcanization accelerator, and insoluble sulfur is 5-30:10-20:50-100. In this invention, the vulcanization accelerator enables the sulfur in the insoluble sulfur to crosslink with the modified asphalt. The insoluble sulfur and the biomass matrix material exert a synergistic effect, promoting the formation of a crosslinked network between waste plastics and waste rubber and petroleum asphalt. This not only enhances the performance of the modified asphalt but also inhibits the generation of hydrogen sulfide gas at the source, thereby reducing the emission of irritating odors during the production of modified asphalt, reducing environmental pollution, and ensuring worker safety.

[0018] This invention also provides a flame-retardant, odor-neutralizing, and environmentally friendly multifunctional modified asphalt. By mass fraction, the raw materials include 70-94% petroleum asphalt, 3-10% waste plastics and waste rubber, 0.8-2.9% bio-based stabilizer, 0.2-4.5% flame retardant, and 0.3-3.8% odor neutralizer. This invention reduces the emission of irritating odors through the odor neutralizer and, through the synergistic effect of the bio-based stabilizer and flame retardant, inhibits the generation of hydrogen sulfide gas at its source, achieving the effect of neutralizing the asphalt's odor. Simultaneously, the flame retardant can shield ultraviolet rays and block oxygen, significantly improving the flame-retardant properties of the modified asphalt. Furthermore, this invention uses safe and inexpensive waste plastics and waste rubber as modifiers, meeting green environmental protection requirements, offering good environmental benefits, and demonstrating good scalability and economic benefits. Attached Figure Description

[0019] Figure 1 Images showing the addition of a 2.5cm asphalt layer to Highway A;

[0020] Figure 2 Images of a 2.0cm asphalt overlay being laid on Highway B;

[0021] Figure 3 Images of a 2.0cm asphalt overlay being laid on the C Expressway;

[0022] Figure 4 Image showing the addition of a 2.5cm asphalt overlay to the D Expressway tunnel. Detailed Implementation

[0023] This invention provides a bio-based stabilizer material, the raw materials for which include biomass matrix material, vulcanization accelerator and insoluble sulfur; the mass ratio of the biomass matrix material, vulcanization accelerator and insoluble sulfur is 5-30:10-20:50-100.

[0024] In this invention, the preferred mass ratio of the biomass matrix material, the vulcanization accelerator, and the insoluble sulfur is 5-10:12-15:60-80.

[0025] In this invention, the biomass matrix material preferably comprises bio-based formaldehyde resin or bio-based dithiocarbamate. In this invention, the bio-based dithiocarbamate is preferably bio-based zinc dithiocarbamate.

[0026] In this invention, the vulcanization accelerator preferably includes one or more of the following: zinc n-butyl xanthate, tetramethyl thiuram monosulfide, tetramethyl thiuram disulfide, N-oxodi-2-benzothiazole sulfenamide, 2-(4-morpholinylthio)benzothiazole, zinc dialkyl dithiocarbamate, amine compounds, iodine, copper salts, copper oxides, cobalt salts, cobalt oxides, iron oxides, and iron salts.

[0027] In this invention, the raw materials for preparing the insoluble sulfur preferably include sulfur, terpenoid compounds, and organometallic salts. In this invention, the mass ratio of sulfur, terpenoid compounds, and organometallic salts is preferably 10–30:1–4:5–20. In this invention, the terpenoid compounds preferably include α-pinene from turpentine oil, limonene from citrus fruits, or semi-terpenes from poplar. In this invention, the organometallic salts preferably include one or more of the organometallic ions Pb, Ba, Li, Zn, and Al.

[0028] In this invention, the preferred method for preparing the insoluble sulfur includes: sequentially polymerizing sulfur, terpenoid compounds, and organometallic salts, followed by rapid cooling, extraction, and oil extrusion to obtain a thermoplastic linear polymer. In a specific embodiment of this invention, the insoluble sulfur was prepared according to the reference (Du Mengcheng, Wang Weimin, Sun Qinggang. Current Status of Insoluble Sulfur Production Technology [J]. Rubber Technology, 2013, 11(06):13-17.). In this invention, the insoluble sulfur is stable, does not easily undergo chemical migration, has good dispersibility, and exhibits excellent effects.

[0029] This invention provides a method for preparing the bio-based stabilizer material described in the above technical solution, comprising the following steps:

[0030] A biomass-based material, a vulcanization accelerator, and insoluble sulfur are mixed to obtain a bio-based stabilizer material; the mixing temperature is 180–190°C. In this invention, the mixing is preferably carried out under high-speed rotation conditions; the preferred high-speed rotation rate is 3000–6000 r / min. In this invention, the mixing time is preferably 1–2 hours.

[0031] This invention provides a flame-retardant, odor-neutralizing, environmentally friendly, multifunctional modified asphalt. By mass fraction, the raw materials include 70-94% petroleum asphalt, 3-10% waste plastics and waste rubber, 0.8-2.9% bio-based stabilizer, 0.2-4.5% flame retardant, and 0.3-3.8% odor neutralizer.

[0032] By mass fraction, the raw materials for preparing the flame-retardant, odor-neutralizing, environmentally friendly, multifunctional modified asphalt provided by this invention comprise 70-94% petroleum asphalt, preferably 89.4-91.2%. In this invention, the petroleum asphalt preferably includes one of 50# petroleum asphalt, 70# petroleum asphalt, 90# petroleum asphalt, and 110# petroleum asphalt.

[0033] The raw materials for preparing the flame-retardant, odor-neutralizing, environmentally friendly, multifunctional modified asphalt provided by this invention, by mass fraction, include 3-10% waste plastics and waste rubber, preferably 4%. In this invention, the mass ratio of waste plastics to waste rubber is preferably 2-3:1-2. In this invention, the waste plastics and waste rubber are preferably in granular form; the particle size of the granular waste plastics and waste rubber is preferably 20-80 mesh; the preparation method of the granular waste plastics and waste rubber preferably includes: sequentially crushing and granulating the waste plastics and waste rubber. In this invention, the total number-average molecular weight of the waste plastics and waste rubber is preferably 100,000-300,000; the number-average molecular weight of the waste plastics is preferably 100,000; the number-average molecular weight of the waste rubber is preferably 100,000. This invention uses safe and inexpensive waste plastics and waste rubber as modifiers, which have good high-temperature resistance and aging resistance, and are effective in improving the high-temperature performance of asphalt. Furthermore, it meets the requirements of green environmental protection, has good environmental benefits, and has good scalability and economic benefits.

[0034] By mass fraction, the raw materials for preparing the flame-retardant, odor-neutralizing, environmentally friendly, multifunctional modified asphalt provided by the present invention include 0.8-2.9% of the bio-based stabilizer material described in the above technical solution, preferably 1.0-1.5%.

[0035] The raw materials for preparing the flame-retardant, odor-neutralizing, environmentally friendly, multifunctional modified asphalt provided by this invention, by mass fraction, include 0.2-4.5% flame retardant, preferably 2.0-3.0%. In this invention, the flame retardant is preferably a layered halogen-free organosilicon synergistic flame retardant, more preferably a mixture of ternary layered bimetallic hydroxide, nano-aluminum hydroxide, and silica. In this invention, the mass ratio of the ternary layered bimetallic hydroxide, nano-aluminum hydroxide, and silica is preferably 1-2:0.1-0.5:1-3, more preferably 1.4:0.3:0.9. In this invention, the ternary layered bimetallic hydroxide is preferably MgAlZn-LDHs; the molar ratio of magnesium, aluminum, and zinc in the MgAlZn-LDHs is preferably 2:1:1. In this invention, the particle size of the nano-aluminum hydroxide is preferably 15-25 nm.

[0036] In this invention, the MgAlZn-LDHs are preferably prepared by a co-precipitation method; the preparation method of the MgAlZn-LDHs preferably includes: adding a mixed solution of magnesium nitrate, aluminum nitrate, and zinc nitrate dropwise to a sodium hydroxide solution to carry out a crystallization reaction, thereby obtaining MgAlZn-LDHs. In this invention, the molar ratio of magnesium, aluminum, and zinc in the mixed solution of magnesium nitrate, aluminum nitrate, and zinc nitrate is preferably 2:1:1; the total concentration of the mixed solution of magnesium nitrate, aluminum nitrate, and zinc nitrate is preferably 2 mol / L. In this invention, the concentration of the sodium hydroxide solution is preferably 2 mol / L. In this invention, the volume ratio of the mixed solution of magnesium nitrate, aluminum nitrate, and zinc nitrate to the sodium hydroxide solution is preferably 3:7. In this invention, the dropwise addition is preferably done dropwise. In this invention, the temperature of the sodium hydroxide solution during the dropwise addition is preferably 40°C; stirring is performed while adding the solution. In this invention, the temperature of the crystallization reaction is preferably 90°C; the time of the crystallization reaction is preferably 3 hours. Preferably, after the crystallization reaction, the obtained product is subjected to centrifugation, washing, and drying sequentially to obtain MgAlZn-LDHs. In this invention, the drying temperature is preferably 100°C, and the drying time is preferably 24 hours.

[0037] In this invention, the ternary layered bimetallic hydroxide possesses advantages such as environmental friendliness and smoke suppression. When mixed with nano-aluminum hydroxide and silica, the synergistic effect of the three is fully utilized. Through its nano-layered structure, it shields ultraviolet rays and blocks oxygen, effectively reducing the asphalt's combustion intensity and significantly improving the flame-retardant properties of the modified asphalt. Furthermore, the alkaline composite metal oxides produced during decomposition promote the formation of a surface barrier layer, greatly reducing smoke generation, minimizing environmental pollution, and protecting workers' health. This invention utilizes the synergistic effect of bio-based stabilizer materials and the flame retardant to inhibit the generation of hydrogen sulfide gas at its source, achieving a deodorizing effect on asphalt.

[0038] The raw materials for preparing the flame-retardant, odor-neutralizing, environmentally friendly, multifunctional modified asphalt provided by this invention, by mass fraction, include 0.3-3.8% odor neutralizer, preferably 1.5-2.8%. In this invention, the odor neutralizer preferably includes biochar material and surfactant. In this invention, the mass ratio of the biochar material to the surfactant is preferably 0.5-1.9:0.2-0.6, more preferably 1:0.4. In this invention, the biochar material preferably includes one of grapefruit peel biochar material, orange peel biochar material, and walnut shell biochar material. In this invention, the preparation method of the biochar material preferably includes: first grinding biomass to obtain biomass powder; carbonizing the biomass powder in a muffle furnace to obtain carbonized material; second grinding the carbonized material to obtain carbonized powder; soaking the carbonized powder in water, drying it, and obtaining the biochar material. In this invention, the biomass preferably includes grapefruit peel, orange peel, or walnut shell. In this invention, the particle size of the biomass powder is preferably 30 mesh. In this invention, the carbonization temperature is preferably 500°C; the carbonization time is preferably 3 hours. In this invention, the particle size of the carbonized powder is preferably 80 mesh. In this invention, the soaking time of the carbonized powder in water is preferably 24 hours; the water is preferably deionized water. This invention removes impurities by soaking the carbonized powder in water. In this invention, the drying temperature is preferably 100°C.

[0039] In this invention, the surfactant preferably includes one of amino acid-based surfactants, sulfonate surfactants, and betaine-based surfactants. In this invention, the odor neutralizer utilizes physical adsorption to adsorb the odor of asphalt, effectively reducing the generation and volatilization of asphalt fumes such as hydrogen sulfide and sulfur dioxide, thus mitigating the harm caused by asphalt fumes.

[0040] This invention provides a method for preparing a flame-retardant, odor-neutralizing, environmentally friendly, multifunctional modified asphalt suitable for laboratory use, preferably comprising the following steps:

[0041] Petroleum asphalt is heated to obtain molten petroleum asphalt;

[0042] The molten petroleum asphalt is mixed with waste plastics and waste rubber to obtain the first modified asphalt;

[0043] The first modified asphalt is mixed with flame retardant, bio-based stabilizer material and deodorizing agent to obtain the second modified asphalt;

[0044] The second modified asphalt was further developed to obtain a flame-retardant, odor-neutralizing, environmentally friendly, multifunctional modified asphalt.

[0045] In this invention, petroleum asphalt is preferably heated to obtain molten petroleum asphalt. In this invention, the heating temperature is preferably 165–175°C; the heating time is preferably 5–20 minutes.

[0046] After obtaining molten petroleum asphalt, the present invention preferably mixes the molten petroleum asphalt with waste plastics and waste rubber to obtain a first modified asphalt. In the present invention, the mixing is preferably carried out under stirring conditions; the stirring rate is preferably 2000-4000 r / min; and the stirring time is preferably 1.5-2.5 h.

[0047] After obtaining the first modified asphalt, the present invention preferably mixes the first modified asphalt with a flame retardant, a bio-based stabilizer, and a neutralizing agent to obtain a second modified asphalt. In the present invention, the preferred mixing order is: adding the flame retardant, the bio-based stabilizer, and the neutralizing agent sequentially to the first modified asphalt. In the present invention, the mixing is preferably carried out under stirring conditions; the stirring rate is preferably 2000–4000 r / min; and the stirring time is preferably 1–1.5 h.

[0048] After obtaining the second modified asphalt, the present invention preferably further develops the second modified asphalt to obtain a flame-retardant, odor-neutralizing, environmentally friendly, multifunctional modified asphalt. In the present invention, the development temperature is preferably 163°C; the development time is preferably 0.5 hours.

[0049] This invention provides a method for preparing flame-retardant, odor-neutralizing, environmentally friendly, multifunctional modified asphalt suitable for factories, preferably comprising the following steps:

[0050] Half of the petroleum asphalt is heated, and waste plastics and waste rubber are added to the molten petroleum asphalt and mixed to obtain asphalt mixture A.

[0051] The other half of the petroleum asphalt is heated, and flame retardants, bio-based stabilizers and deodorizers are added to the molten petroleum asphalt and mixed to obtain asphalt mixture B.

[0052] The asphalt mixture A and asphalt mixture B are mixed to obtain flame-retardant, odor-neutralizing, environmentally friendly, multifunctional modified asphalt.

[0053] In this invention, half of the petroleum asphalt is heated, and waste plastics and waste rubber are added to the molten petroleum asphalt and mixed to obtain asphalt mixture A. In this invention, the heating temperature is preferably 170–180°C. In this invention, the mixing is preferably performed using a multi-layer propeller mixer or a colloid mill. In this invention, when using a multi-layer propeller mixer, the rotation speed is preferably 2000–3000 r / min, and the mixing time is 1–2 h.

[0054] In this invention, the other half of the petroleum asphalt is heated, and a flame retardant, a bio-based stabilizer, and a neutralizing agent are added to the molten petroleum asphalt and mixed to obtain asphalt mixture B. In this invention, the heating temperature is preferably 170–180°C. In this invention, the preferred order of adding the flame retardant, bio-based stabilizer, and neutralizing agent is: first add the flame retardant, then add the bio-based stabilizer, and finally add the neutralizing agent. In this invention, the mixing is preferably carried out under stirring conditions; the stirring rate is preferably 500–1000 r / min; and the stirring time is preferably 0.5–1.5 h.

[0055] After obtaining asphalt mixture A and asphalt mixture B, the present invention preferably mixes asphalt mixture A and asphalt mixture B to obtain flame-retardant, odor-neutralizing, environmentally friendly, multifunctional modified asphalt. In the present invention, the mixing temperature is preferably 170-180℃; the mixing is preferably carried out under stirring conditions; the stirring rate is preferably 500-1000 r / min; and the stirring time is preferably 2-3 h.

[0056] In this invention, a small-scale mixing device is used in the laboratory to add ingredients sequentially and mix for a sufficient time to obtain flame-retardant, odor-neutralizing, environmentally friendly, multifunctional modified asphalt. Factory production involves batch production with more equipment, and can be divided into asphalt mixture A and asphalt mixture B for separate production, saving time and improving efficiency.

[0057] This invention provides the application of the flame-retardant, odor-neutralizing, environmentally friendly, multifunctional modified asphalt described in the above-mentioned technical solution in asphalt concrete. In this invention, the preferred method of application includes: mixing the flame-retardant, odor-neutralizing, environmentally friendly, multifunctional modified asphalt, aggregates, mineral powder, and lignin fiber, followed by mixing and molding to obtain asphalt concrete. In this invention, the preferred mass ratio of the flame-retardant, odor-neutralizing, environmentally friendly, multifunctional modified asphalt, aggregates, mineral powder, and lignin fiber is 100:1800–2200:62–120:4. In this invention, the preferred aggregates are diabase crushed stone with a particle size of 5–10 mm, diabase crushed stone with a particle size of 3–5 mm, and diabase manufactured sand with a particle size of 0–3 mm. In this invention, the above-mentioned aggregates serve as both a skeleton and a filler in the pavement material. In this invention, the preferred mineral powder is limestone mineral powder, and a skeleton-reinforced gradation is selected.

[0058] In this invention, the preferred method of mixing the flame-retardant, odor-neutralizing, environmentally friendly multifunctional modified asphalt, aggregates, mineral powder, and lignin fibers includes: adding lignin fibers to aggregates preheated to 180-200°C for mixing, then adding mineral powder for stirring, and finally adding the flame-retardant, odor-neutralizing, environmentally friendly multifunctional modified asphalt preheated to 170-180°C to the aggregates that have been mixed evenly.

[0059] The technical solutions of this invention will be clearly and completely described below with reference to the embodiments thereof. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0060] Example 1

[0061] Bio-based formaldehyde resin, tetramethylthiuram disulfide, and insoluble sulfur were mixed at high speed in a reactor at 185°C with a rotation speed of 4500 r / min for 1.2 h to obtain a bio-based stabilizer material; the mass ratio of the bio-based formaldehyde resin, tetramethylthiuram disulfide, and insoluble sulfur was 1:2:5.

[0062] Application Example 1

[0063] In this application example, the raw materials for preparing the flame-retardant, odor-neutralizing, environmentally friendly, multifunctional modified asphalt, by mass fraction, are: 89.4% 70# petroleum asphalt, 4% granular waste plastics and waste rubber, 1.5% bio-based stabilizer material prepared in Example 1, 2.3% layered halogen-free organosilicon synergistic flame retardant, and 2.8% odor neutralizer; the layered halogen-free organosilicon synergistic flame retardant is composed of ternary layered bimetallic hydroxide MgAlZn-LDHs, nano-aluminum hydroxide, and silica; the mass ratio of the ternary layered bimetallic hydroxide MgAlZn-LDHs, nano-aluminum hydroxide, and silica is 1.4:0.3:0.9; the odor neutralizer is composed of grapefruit peel biochar material and betaine-type surfactant; the mass ratio of the grapefruit peel biochar material to the surfactant is 1:0.4.

[0064] S1: Heat the petroleum asphalt in the mixer to 170℃. After heating for 8 minutes, add granular waste plastic and waste rubber into the petroleum asphalt and continue stirring at 3500r / min for 2 hours using multi-layer propeller mixing blades.

[0065] S2: Add the layered halogen-free organosilicon synergistic flame retardant, bio-based stabilizer material and deodorizing agent in sequence, and stir continuously at 3000 r / min for 1 hour;

[0066] S3: Place the modified asphalt prepared in step S2 in an oven at 163℃ for 0.5h to obtain flame-retardant, odor-neutralizing, environmentally friendly, multifunctional modified asphalt.

[0067] By weight, 4 parts of lignin fiber were added to 2000 parts of aggregate preheated to 180℃ and mixed for 12 seconds, followed by 62 parts of mineral powder and mixing for 85 seconds. Finally, 100 parts of the flame-retardant, odor-neutralizing, environmentally friendly, multifunctional modified asphalt preheated to 175℃ were added to the uniformly mixed aggregate. After molding, a flame-retardant, odor-neutralizing, environmentally friendly, multifunctional modified asphalt concrete was obtained. The aggregate consisted of diabase crushed stone with a particle size of 5-10 mm, diabase crushed stone with a particle size of 3-5 mm, and diabase manufactured sand with a particle size of 0-3 mm; the mineral powder was limestone mineral powder with a particle size below 0.075 mm.

[0068] Application Example 2

[0069] The preparation method is basically the same as that in Application Example 1, except that in this application example, the raw materials for preparing the flame-retardant, odor-neutralizing, environmentally friendly, multifunctional modified asphalt, by mass fraction, are: 89.5% of 70# petroleum asphalt, 4% of granular waste plastics and waste rubber, 1.5% of the bio-based stabilizer material prepared in Example 1, 3.0% of the layered halogen-free organosilicon synergistic flame retardant, and 1.5% of the odor neutralizer; the layered halogen-free organosilicon synergistic flame retardant is composed of ternary layered bimetallic hydroxide MgAlZn-LDHs, nano-aluminum hydroxide, and silica; the mass ratio of the ternary layered bimetallic hydroxide MgAlZn-LDHs, nano-aluminum hydroxide, and silica is 1.4:0.3:0.9; the odor neutralizer is composed of grapefruit peel biochar material and betaine-type surfactant; the mass ratio of the grapefruit peel biochar material to the surfactant is 1:0.4.

[0070] Application Example 3

[0071] The preparation method is basically the same as that in Application Example 1, except that in this application example, the raw materials for preparing the flame-retardant, odor-neutralizing, environmentally friendly, multifunctional modified asphalt, by mass fraction, are: 89.4% of 70# petroleum asphalt, 4% of granular waste plastics and waste rubber, 1.5% of the bio-based stabilizer material prepared in Example 1, 2.0% of the layered halogen-free organosilicon synergistic flame retardant, and 2.8% of the odor neutralizer; the layered halogen-free organosilicon synergistic flame retardant is composed of ternary layered bimetallic hydroxide MgAlZn-LDHs, nano-aluminum hydroxide, and silica; the mass ratio of the ternary layered bimetallic hydroxide MgAlZn-LDHs, nano-aluminum hydroxide, and silica is 1.4:0.3:0.9; the odor neutralizer is composed of grapefruit peel biochar material and betaine-type surfactant; the mass ratio of the grapefruit peel biochar material to the surfactant is 1:0.4.

[0072] Application Example 4

[0073] The preparation method is basically the same as that in Application Example 1, except that in this application example, the raw materials for preparing the flame-retardant, odor-neutralizing, environmentally friendly, multifunctional modified asphalt, by mass fraction, are: 91.2% of 70# petroleum asphalt, 4% of granular waste plastics and waste rubber, 1.0% of the bio-based stabilizer material prepared in Example 1, 2.3% of layered halogen-free organosilicon synergistic flame retardant, and 1.5% odor neutralizer; the layered halogen-free organosilicon synergistic flame retardant is composed of ternary layered bimetallic hydroxide MgAlZn-LDHs, nano-aluminum hydroxide, and silica; the mass ratio of the ternary layered bimetallic hydroxide MgAlZn-LDHs, nano-aluminum hydroxide, and silica is 1.4:0.3:0.9; the odor neutralizer is composed of grapefruit peel biochar material and betaine-type surfactant; the mass ratio of the grapefruit peel biochar material to the surfactant is 1:0.4.

[0074] Comparative Example 1

[0075] The preparation method is basically the same as that in Application Example 1, except that, by mass fraction, the raw materials for preparing the modified asphalt are: 91.2% of 70# petroleum asphalt, 4% of granular waste plastics and waste rubber, 1.5% of bio-based stabilizer material and 2.3% of layered halogen-free organosilicon synergistic flame retardant.

[0076] Comparative Example 2

[0077] The preparation method is basically the same as that in Application Example 1, except that, by mass fraction, the raw materials for preparing the modified asphalt are: 91.7% of 70# petroleum asphalt, 4% of granular waste plastics and waste rubber, 1.5% of bio-based stabilizer material and 2.8% of neutralizing agent.

[0078] Comparative Example 3

[0079] The preparation method is basically the same as that in Application Example 1, except that, by mass fraction, the raw materials for preparing the modified asphalt are: 90.9% of 70# petroleum asphalt, 4% of granular waste plastics and waste rubber, 2.3% of layered halogen-free organosilicon synergistic flame retardant and 2.8% of neutralizing agent.

[0080] Comparative Example 4

[0081] The preparation method is basically the same as that in Application Example 1, except that 96 wt% of 70# petroleum asphalt and 4 wt% of styrene-butadiene-styrene are used to prepare the modified asphalt.

[0082] Blank group

[0083] The preparation method is basically the same as that in Application Example 1, except that 96 wt% of 70# petroleum asphalt and 4 wt% of granular waste plastics and waste rubber are used to prepare the modified asphalt.

[0084] Test case

[0085] The asphalt concrete from Application Examples 1-4, Comparative Examples 1-4, and the control group were cut into 70mm × 70mm × 10mm blocks. These blocks were then placed in a cone calorimeter for testing, with a thermal radiation intensity of 50kW / m². 2 The test results are shown in Table 1. The properties of the modified asphalt in Application Examples 1-4, Comparative Examples 1-4, and the blank group are shown in Table 2.

[0086] Table 1 Cone Calorimeter Test of Asphalt Concrete

[0087]

[0088] Table 2 Performance Indicators of Asphalt with Different Mixture Ratios

[0089]

[0090] As shown in Tables 1-2, compared with Comparative Examples 1-4, the present invention has better odor neutralization and flame retardant properties in Application Examples 1-4. This indicates that adding bio-based stabilizer materials, ternary layered bimetallic hydroxides, nano-aluminum hydroxide, and silica to asphalt can fully leverage the synergistic effect of each component, achieving the effect of odor neutralization in asphalt and significantly improving the flame retardant properties of modified asphalt. By strictly controlling the dosage of the above components, the synergistic effect of each component can be fully leveraged, resulting in modified asphalt with better performance.

[0091] Compared with the modified asphalt prepared by styrene-butadiene-styrene used in Comparative Example 4, the modified asphalt prepared by waste plastics and waste rubber used in this invention is safer and cheaper, has excellent performance, meets the requirements of green environmental protection, has good environmental benefits, and has good scalability and economic benefits.

[0092] This invention uses the flame-retardant, odor-neutralizing, environmentally friendly, multifunctional modified asphalt formulation from Application Example 1 to prepare asphalt concrete according to the method in Application Example 1, and it has been used for paving newly built and maintained sections of the A, B, C, and D expressways in Guangdong Province.

[0093] Figure 1 A 2.5cm asphalt surface layer was laid on the bridge and roadbed section of the A Expressway. Ten months after the road opened to traffic, there were no ruts or defects on the road surface. The international smoothness index was still 0.78m / km, the average lateral force coefficient was 59, and the anti-skid performance was relatively stable.

[0094] Figure 2The B Expressway was overlaid with a 2.0cm asphalt overlay. Nine months after it opened to traffic, the International Roughness Index (IRI) remained at 1.0m / km, the lateral force coefficient remained between 55 and 60, there were no cracks or ruts, and the high temperature stability was good.

[0095] Figure 3 The C Expressway was overlaid with a 2.0cm asphalt overlay. Six months after the road opened to traffic, the road surface smoothness was at an excellent level (≤1.9m / km), the road rut depth RD≤5mm, the average lateral force coefficient remained between 56 and 59, and all performance characteristics were stable.

[0096] Figure 4 A 2.5cm asphalt overlay was laid inside the tunnel of the D Expressway. The construction site produced virtually no smoke, achieving the performance characteristics of being odorless and environmentally friendly. Six months after the road opened to traffic, the road surface smoothness IRI inside the tunnel was ≤1.2m / km, the rutting depth RD was 2-4mm, there were no rutting defects, and the road surface showed good high-temperature stability.

[0097] Analysis of the tracking observation data of the above four newly built and maintained road sections shows that the asphalt mixture prepared by the flame-retardant, odor-neutralizing, environmentally friendly, multifunctional modified asphalt provided by the present invention has excellent road performance. This indicates that the flame-retardant, odor-neutralizing, environmentally friendly, multifunctional modified asphalt provided by the present invention not only has the advantages of flame retardancy and odor neutralization, but also has excellent high-temperature resistance.

[0098] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A flame-retardant, odor-neutralizing, environmentally friendly, multifunctional modified asphalt, comprising, by mass fraction, 70-94% petroleum asphalt, 3-10% waste plastics and waste rubber, 0.8-2.9% bio-based stabilizer material, 0.2-4.5% flame retardant, and 0.3-3.8% odor neutralizer; wherein the bio-based stabilizer material comprises biomass matrix material, vulcanization accelerator, and insoluble sulfur; and the mass ratio of the biomass matrix material, vulcanization accelerator, and insoluble sulfur is 5-30:10-20:50-100. The flame retardant is a mixture of ternary layered bimetallic hydroxide, nano-aluminum hydroxide, and silicon dioxide; the mass ratio of the ternary layered bimetallic hydroxide, nano-aluminum hydroxide, and silicon dioxide is 1-2:0.1-0.5:1-3.

2. The flame-retardant, odor-neutralizing, environmentally friendly, multifunctional modified asphalt according to claim 1, characterized in that, The mass ratio of waste plastic to waste rubber is 2-3:1-2.

3. The flame-retardant, odor-neutralizing, environmentally friendly, multifunctional modified asphalt according to claim 1, characterized in that, The deodorizing agent comprises biochar material and surfactant; the mass ratio of the biochar material to the surfactant is 0.5–1.9:0.2–0.

6.

4. The flame-retardant, odor-neutralizing, environmentally friendly, multifunctional modified asphalt according to claim 3, characterized in that, The biochar material includes one of grapefruit peel biochar, orange peel biochar, and walnut shell biochar.

5. The flame-retardant, odor-neutralizing, environmentally friendly, multifunctional modified asphalt according to claim 3, characterized in that, The surfactant includes one of the following: amino acid surfactants, sulfonate surfactants, and betaine surfactants.

6. The flame-retardant, odor-neutralizing, environmentally friendly, multifunctional modified asphalt according to claim 1, characterized in that, The preparation method of the bio-based stabilizer material includes the following steps: A biomass-based material, a vulcanization accelerator, and insoluble sulfur are mixed to obtain a bio-based stabilizer material; the mixing temperature is 180–190°C.

7. The application of the flame-retardant, odor-neutralizing, environmentally friendly, multifunctional modified asphalt according to any one of claims 1 to 6 in asphalt concrete.

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