CN115895178A - Bio-based stabilizer material, preparation method thereof, flame-retardant, odor-free and environment-friendly multifunctional modified asphalt and application thereof - Google Patents

Abstract

The invention provides a bio-based stabilizer material and a preparation method thereof, a flame-retardant, odor-free and environment-friendly multifunctional modified asphalt and its application, and relates to the technical field of road engineering. The bio-based stabilizer material provided by the invention, the raw materials for preparation 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. The flame-retardant, clean-odor and environment-friendly multifunctional modified asphalt provided by the present invention comprises 70-94% of petroleum asphalt, 3-10% of waste plastics and waste rubber, and 0.8-94% of the bio-based stabilizer material in terms of mass fraction. 2.9%, flame retardant 0.2-4.5%, deodorant 0.3-3.8%. Using the bio-based stabilizer material provided by the invention as a 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 of the modified asphalt.

Description

A bio-based stabilizer material and its preparation method, flame-retardant, odor-free and environment-friendly multifunctional modified asphalt and its application

technical field

The invention relates to the technical field of road engineering, in particular to a bio-based stabilizer material and a preparation method thereof, a flame-retardant, odor-free and environment-friendly multifunctional modified asphalt and its application.

Background technique

Because asphalt pavement has the advantages of short construction period, easy maintenance and comfortable driving, most of the highways in my country are currently paved with asphalt. Due to its excellent performance, hot mix asphalt is widely used in the construction, reconstruction and expansion of highways and maintenance.

However, the hot mix asphalt mixture still has the following problems: In order to ensure that the asphalt mixture has better construction workability during the construction process, it needs to be heated to a higher temperature during hot mixing and paving, etc. This not only causes a large amount of energy consumption, accelerated aging of asphalt, but also produces a large amount of asphalt smoke (hydrogen sulfide, benzene, toluene, xylene and benzopyrene). Asphalt smoke not only affects the environment, but also seriously threatens the health of construction workers. A large amount of smoke dilutes the oxygen in the air, which will cause mechanical equipment to stop malfunctioning and affect the construction progress.

Contents of the invention

The purpose of the present invention is to provide a bio-based stabilizer material and its preparation method, flame-retardant, odor-free and environment-friendly multi-functional modified asphalt and its application. The bio-based stabilizer material provided by the present invention is used as raw material to prepare modified asphalt, not only It enhances the performance of modified asphalt, and can also suppress the generation of hydrogen sulfide gas from the source, thereby reducing the irritating odor emitted during the production of modified asphalt, reducing environmental pollution, and ensuring worker safety.

In order to achieve the above-mentioned purpose of the invention, the present invention provides the following technical solutions:

The invention provides a bio-based stabilizer material. The raw materials for preparation 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.

The present invention provides a preparation method of the bio-based stabilizer material described in the above technical solution, comprising the following steps:

The biomass base material, the vulcanization accelerator and the insoluble sulfur are mixed to obtain the bio-based stabilizer material; the mixing temperature is 180-190°C.

The invention provides a flame-retardant, clean-odor and environment-friendly multifunctional modified asphalt. In terms of mass fraction, the raw materials for preparation include 70-94% of petroleum asphalt, 3-10% of waste plastics and waste rubber, and the bio-based 0.8-2.9% of the stabilizer material or the bio-based stabilizer material prepared by the preparation method described in the above-mentioned technical solution, 0.2-4.5% of the flame retardant, and 0.3-3.8% of the deodorant.

Preferably, the mass ratio of waste plastics to waste rubber is 2-3:1-2.

Preferably, the flame retardant is a layered halogen-free silicone synergistic flame retardant.

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

Preferably, the deodorant includes biochar materials and surfactants; the mass ratio of biochar materials to surfactants is 0.5-1.9:0.2-0.6.

Preferably, the biochar material includes one of pomelo peel biochar material, orange peel biochar material and walnut shell biochar material.

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

The present invention provides the application of flame-retardant, clean-odor and environment-friendly multifunctional modified asphalt in asphalt concrete described in the above technical proposal.

The invention provides a bio-based stabilizer material. The raw materials for preparation 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. In the present invention, the vulcanization accelerator can make the sulfur in the insoluble sulfur cross-link with the modified asphalt, and the insoluble sulfur and the biomass matrix material play a synergistic effect to promote the formation of a cross-linked network between waste plastics, waste rubber and petroleum asphalt , not only enhances the performance of modified asphalt, but also suppresses the generation of hydrogen sulfide gas from the source, thereby reducing the irritating odor emitted during the production of modified asphalt, reducing environmental pollution, and ensuring worker safety.

The present invention also provides a flame-retardant, clean-odor and environment-friendly multifunctional modified asphalt. The raw materials for preparation include 70-94% of petroleum asphalt, 3-10% of waste plastics and waste rubber, and the biological Base stabilizer material 0.8-2.9%, flame retardant 0.2-4.5%, deodorant 0.3-3.8%. The invention reduces the emission of irritating odor through the deodorizer, utilizes the synergistic effect of the bio-based stabilizer material and the flame retardant, suppresses the generation of hydrogen sulfide gas from the source, and achieves the effect of asphalt deodorization. At the same time, the flame retardant can shield ultraviolet rays, block oxygen, and significantly improve the flame retardancy of modified asphalt. In addition, the present invention uses safe and cheap waste plastics and waste rubber as modifiers, meets the requirements of green environmental protection, has good environmental benefits, and has good scalability and economic benefits.

Description of drawings

Figure 1 is a picture of the 2.5cm asphalt surface layer on A highway;

Fig. 2 is a picture of overlaying 2.0cm asphalt thin layer overlay on expressway B;

Figure 3 is a picture of the 2.0cm asphalt thin layer overlay on the C expressway;

Figure 4 is a picture of a 2.5cm asphalt thin layer overlay on the D high-speed tunnel.

Detailed ways

The invention provides a bio-based stabilizer material. The raw materials for preparation 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.

In the present invention, the mass ratio of the biomass matrix material, vulcanization accelerator and insoluble sulfur is preferably 5-10:12-15:60-80.

In the present invention, the biomass matrix material preferably includes bio-based formaldehyde resin or bio-based dithioformate. In the present invention, the bio-based dithiocarbamate is preferably zinc bio-based dithiocarbamate.

In the present invention, the vulcanization accelerator preferably includes zinc n-butylxanthate, tetramethylthiuram monosulfide, tetramethylthiuram disulfide, N-oxydiethylene-2-benzothiazole Sulphenamide, 2-(4-morpholinothio)benzothiazole, dialkylzinc dithiocarbamate, amine compounds, iodine, copper salt, copper oxide, cobalt salt, cobalt oxide , one or more of iron oxides and iron salts.

In the present invention, the raw materials for the preparation of the insoluble sulfur preferably include sulfur, terpene compounds and organic metal salts. In the present invention, the mass ratio of the sulfur, terpene compound and organic metal salt is preferably 10-30:1-4:5-20. In the present invention, the terpene compounds preferably include a-pinene in turpentine oil, limonene in citrus or semiterpene in poplar. In the present invention, the organic metal salt preferably includes one or more of organic salts containing metal ions Pb, Ba, Li, Zn, and Al.

In the present invention, the preparation method of the insoluble sulfur preferably comprises: sequentially polymerizing sulfur, terpene compounds and organic metal salts, quenching, extracting and oil-extending to obtain a thermoplastic linear polymer. In a specific embodiment of the present invention, the insoluble sulfur reference (Du Mengcheng, Wang Weimin, Sun Qinggang. Current status of insoluble sulfur production technology [J]. Rubber Science and Technology, 2013, 11 (06): 13-17.) was prepared. In the present invention, the property of the insoluble sulfur is stable, chemical migration is not easy to occur, the dispersibility is good, and the action effect is excellent.

The present invention provides a preparation method of the bio-based stabilizer material described in the above technical solution, comprising the following steps:

The biomass base material, the vulcanization accelerator and the insoluble sulfur are mixed to obtain the bio-based stabilizer material; the mixing temperature is 180-190°C. In the present invention, the mixing is preferably carried out under the condition of high-speed rotation; the speed of the high-speed rotation is preferably 3000-6000 r/min. In the present invention, the mixing time is preferably 1-2 hours.

The invention provides a flame-retardant, clean-odor and environment-friendly multifunctional modified asphalt. In terms of mass fraction, the raw materials for preparation include 70-94% of petroleum asphalt, 3-10% of waste plastics and waste rubber, and the bio-based The stabilizer material is 0.8-2.9%, the flame retardant is 0.2-4.5%, and the deodorant is 0.3-3.8%.

In terms of mass fraction, the raw materials for the preparation of the flame-retardant, odor-free and environment-friendly multifunctional modified asphalt provided by the invention include 70-94% of petroleum asphalt, preferably 89.4-91.2%. In the present invention, the petroleum asphalt preferably includes one of 50# petroleum asphalt, 70# petroleum asphalt, 90# petroleum asphalt and 110# petroleum asphalt.

In terms of mass fraction, the raw materials for the preparation of the flame-retardant, odor-free and environment-friendly multifunctional modified asphalt provided by the invention include 3-10% of waste plastics and waste rubber, preferably 4%. In the present invention, the mass ratio of waste plastics to waste rubber is preferably 2-3:1-2. In the present invention, the waste plastic and waste rubber are preferably granular; the particle diameter of the granular waste plastic and waste rubber is preferably 20 to 80 mesh; the preparation method of the granular waste plastic and waste rubber preferably includes : The waste plastics and waste rubber are crushed and granulated sequentially. In the present invention, the total average molecular weight of the waste plastic and waste rubber is preferably 100,000 to 300,000; the number average molecular weight of the waste plastic is preferably 100,000; the number average molecular weight of the waste rubber is preferably 100,000. The invention uses safe and cheap waste plastics and waste rubber as modifiers, which have good high temperature resistance and aging resistance, and have obvious effects in improving the high temperature performance of asphalt, and meet the requirements of green environmental protection, and have good environmental benefits. It has good scalability and economic benefits.

In terms of mass fraction, the raw materials for the preparation of the flame-retardant, odor-free and environment-friendly multifunctional modified asphalt provided by the present invention include 0.8-2.9% of the bio-based stabilizer material described in the technical solution, preferably 1.0-1.5%.

In terms of mass fraction, the raw materials for the preparation of the flame-retardant, odor-free and environment-friendly multifunctional modified asphalt provided by the invention include 0.2-4.5% of flame retardant, preferably 2.0-3.0%. In the present invention, the flame retardant is preferably a layered halogen-free silicone synergistic flame retardant, more preferably a mixture of ternary layered double metal hydroxide, nanometer aluminum hydroxide and silicon dioxide. In the present invention, the mass ratio of the ternary layered double hydroxide, nano aluminum hydroxide and silicon dioxide is preferably 1-2:0.1-0.5:1-3, more preferably 1.4:0.3:0.9 . In the present invention, the ternary layered double hydroxide is preferably MgAlZn-LDHs; the molar ratio of magnesium, aluminum and zinc in the MgAlZn-LDHs is preferably 2:1:1. In the present invention, the particle size of the nano aluminum hydroxide is preferably 15-25 nm.

In the present invention, the MgAlZn-LDHs is 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 the sodium hydroxide solution, The crystallization reaction was carried out to obtain MgAlZn-LDHs. In the present 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 concentration is preferably 2 mol/L. In the present invention, the concentration of the sodium hydroxide solution is preferably 2 mol/L. In the present 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 the present invention, the dropwise addition is preferably dropwise addition. In the present invention, during the dropping process, the temperature of the sodium hydroxide solution is preferably 40° C.; stirring while dropping. In the present invention, the temperature of the crystallization reaction is preferably 90° C.; the time of the crystallization reaction is preferably 3 hours. In the present invention, it is preferred that after the crystallization reaction, the obtained product is successively centrifuged, washed and dried to obtain MgAlZn-LDHs. In the present invention, the drying temperature is preferably 100° C.; the drying time is preferably 24 hours.

In the present invention, the ternary layered double metal hydroxide has the advantages of environmental protection and smoke suppression. After mixing with nano-alumina hydroxide and silicon dioxide, the synergistic effect of the three is fully exerted, and the nano-layered structure shields Ultraviolet rays and oxygen barrier can effectively reduce the burning strength of asphalt and can significantly improve the flame retardant performance of modified asphalt; and the alkaline composite metal oxide produced by decomposition will promote the formation of surface barrier layer and reduce smoke to a large extent quantity, reduce environmental pollution, and protect the health of workers. The invention utilizes the synergistic effect of the bio-based stabilizer material and the flame retardant to suppress the generation of hydrogen sulfide gas from the source and achieve the effect of asphalt deodorization.

In terms of mass fraction, the raw materials for the preparation of the flame-retardant, deodorizing and environment-friendly multifunctional modified asphalt provided by the invention include 0.3-3.8%, preferably 1.5-2.8%, of deodorizing agent. In the present invention, the deodorant preferably includes biochar materials and surfactants. In the present 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 the present invention, the biochar material preferably includes one of pomelo peel biochar material, orange peel biochar material and walnut shell biochar material. In the present invention, the preparation method of the biochar material preferably includes: first grinding the biomass to obtain biomass powder; carbonizing the biomass powder in a muffle furnace to obtain a carbonized product; Carrying out the second grinding to obtain charcoal powder; soaking the charcoal powder in water and drying to obtain the biochar material. In the present invention, the biomass preferably includes pomelo peel, orange peel or walnut shell. In the present invention, the particle size of the biomass powder is preferably 30 mesh. In the present invention, the carbonization temperature is preferably 500° C.; the carbonization time is preferably 3 hours. In the present invention, the particle size of the carbide powder is preferably 80 mesh. In the present invention, the soaking time of the carbide powder in water is preferably 24 hours; the water is preferably deionized water. The present invention removes impurities by immersing the carbide powder in water. In the present invention, the drying temperature is preferably 100°C.

In the present invention, the surfactant preferably includes one of amino acid-type surfactants, sulfonate-type surfactants and betaine-type surfactants. In the present invention, the deodorizer uses physical adsorption to absorb the taste of asphalt, effectively reducing the generation and volatilization of asphalt fume such as hydrogen sulfide and sulfur dioxide in the asphalt, and reducing the harm caused by asphalt fume.

The invention provides a method for preparing flame-retardant, clean-odor and environment-friendly multifunctional modified asphalt suitable for laboratories, preferably comprising the following steps:

Heating the petroleum asphalt to obtain molten petroleum asphalt;

mixing the molten petroleum asphalt with waste plastics and waste rubber to obtain the first modified asphalt;

Mixing the first modified asphalt with a flame retardant, a bio-based stabilizer material and a deodorant to obtain a second modified asphalt;

The second modified asphalt is developed to obtain a multifunctional modified asphalt with flame retardancy, clean odor and environment protection.

In the present invention, the petroleum asphalt is preferably heated to obtain molten petroleum asphalt. In the present invention, the heating temperature is preferably 165-175° C.; the heating time is preferably 5-20 minutes.

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

After the first modified asphalt is obtained, the present invention preferably mixes the first modified asphalt with a flame retardant, a bio-based stabilizer material and a deodorant to obtain a second modified asphalt. In the present invention, the order of mixing is preferably: add the flame retardant, the bio-based stabilizer material and the deodorant to the first modified asphalt in sequence. In the present invention, the mixing is preferably carried out under stirring conditions; the stirring rate is preferably 2000-4000 r/min; the stirring time is preferably 1-1.5 h.

After the second modified asphalt is obtained, the present invention preferably develops the second modified asphalt to obtain a multifunctional modified asphalt with flame retardancy, clean odor and environment protection. In the present invention, the temperature for the development is preferably 163° C.; the time for the development is preferably 0.5 h.

The invention provides a method for preparing flame-retardant, odor-free and environment-friendly multifunctional modified asphalt suitable for factories, preferably comprising the following steps:

Heating half of the petroleum asphalt, adding waste plastics and waste rubber to the molten petroleum asphalt, and mixing to obtain asphalt mixture A;

Heating the other half of the petroleum asphalt, adding a flame retardant, a bio-based stabilizer material and a deodorant to the molten petroleum asphalt, and mixing to obtain an asphalt mixture B;

The asphalt mixture A and the asphalt mixture B are mixed to obtain a multifunctional modified asphalt with flame retardancy, clean odor and environment protection.

In the present invention, half of the petroleum asphalt is preferably heated, and waste plastics and waste rubber are added to the molten petroleum asphalt for mixing to obtain the asphalt mixture A. In the present invention, the heating temperature is preferably 170-180°C. In the present invention, the mixing is preferably carried out by using a multi-layer propulsion agitator or a colloid mill. In the present invention, when a multi-layer propulsion agitator is used for mixing, the rotation speed is preferably 2000-3000 r/min, and the stirring is performed for 1-2 hours.

The present invention preferably heats the other half of the petroleum asphalt, adds a flame retardant, a bio-based stabilizer material and a deodorant to the molten petroleum asphalt, and mixes it to obtain the asphalt mixture B. In the present invention, the heating temperature is preferably 170-180°C. In the present invention, the order of adding the flame retardant, the bio-based stabilizer material and the deodorant is preferably: add the flame retardant first, then add the bio-based stabilizer material, and finally add the deodorizer. In the present invention, the mixing is preferably carried out under stirring conditions; the stirring rate is preferably 500-1000 r/min; the stirring time is preferably 0.5-1.5 h.

After the asphalt mixture A and the asphalt mixture B are obtained, the present invention preferably mixes the asphalt mixture A and the asphalt mixture B to obtain a multifunctional modified asphalt with flame retardancy, clean odor and environment protection. In the present invention, the mixing temperature is preferably 170-180°C; the mixing is preferably carried out under stirring conditions; the stirring speed is preferably 500-1000r/min; the stirring time is preferably 2-3h .

In the present invention, small-scale mixing equipment is used in the laboratory to add in order and stir for a sufficient time to obtain a flame-retardant, odor-free and environmentally-friendly multifunctional modified asphalt. The factory production is mass production with many equipments, which can be divided into asphalt mixture A and asphalt mixture B for production separately, which can save time and improve efficiency.

The present invention provides the application of flame-retardant, clean-odor and environment-friendly multifunctional modified asphalt in asphalt concrete described in the above technical proposal. In the present invention, the application method preferably includes: mixing the flame-retardant, odor-free and environment-friendly multifunctional modified asphalt, aggregates, mineral powder and lignin fiber, and performing kneading and molding to obtain asphalt concrete. In the present invention, the mass ratio of the flame-retardant, odor-free and environment-friendly multifunctional modified asphalt, aggregate, mineral powder and lignin fiber is preferably 100:1800-2200:62-120:4. In the present invention, the aggregate is preferably diabase gravel with a particle size of 5-10 mm, diabase gravel with a particle size of 3-5 mm, and diabase manufactured sand with a particle size of 0-3 mm. The present invention adopts the above-mentioned aggregates to play the role of skeleton and filling in the pavement material. In the present invention, the mineral powder is preferably limestone mineral powder, and the skeleton-enhanced gradation is selected.

In the present invention, the mixing of the flame-retardant, odor-free and environment-friendly multifunctional modified asphalt, aggregate, mineral powder and lignin fiber preferably includes: adding lignin fiber into the aggregate preheated to 180-200°C for mixing , and then add mineral powder for stirring, and finally add the flame-retardant, odor-free and environment-friendly multifunctional modified asphalt preheated to 170-180° C. into the evenly stirred aggregate.

The technical solutions in the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Apparently, the described embodiments are only some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Example 1

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

Application example 1

In this application example, in terms of mass fraction, the raw materials for the preparation of flame-retardant, odor-free and environmentally-friendly multifunctional modified asphalt are: 89.4% of 70# petroleum asphalt, 4% of granular waste plastics and waste rubber, and 1.5% of Example 1 The prepared bio-based stabilizer material, 2.3% layered halogen-free silicone synergistic flame retardant, 2.8% deodorant; MgAlZn-LDHs, nano aluminum hydroxide and silicon dioxide; the mass ratio of the ternary layered double metal hydroxide MgAlZn-LDHs, nano aluminum hydroxide and silicon dioxide is 1.4:0.3:0.9; the The deodorant is composed of pomelo peel biochar material and betaine surfactant; the mass ratio of pomelo peel biochar material to surfactant is 1:0.4.

S1: Heat the petroleum asphalt in the mixer to 170°C. After heating for 8 minutes, put granular waste plastics and waste rubber into the petroleum asphalt, and use multi-layer push-type stirring blades to continue stirring at 3500r/min for 2 hours;

S2: Add layered halogen-free silicone synergistic flame retardant, bio-based stabilizer material and deodorizer in sequence, and keep stirring at 3000r/min for 1h;

S3: The modified asphalt prepared in step S2 was placed in an oven at 163° C. for 0.5 h to develop, to obtain a multifunctional modified asphalt with flame retardancy, clean odor and environmental protection.

In parts by weight, 4 parts of lignin fibers were added to 2000 parts of aggregate preheated to 180°C and stirred for 12 seconds, then 62 parts of mineral powder were added and stirred for 85 seconds, and finally 100 parts of the Flame-retardant, clean-odor and environment-friendly multi-functional modified asphalt is added to the evenly stirred aggregate, and after forming, a kind of flame-retardant, clean-odor and environment-friendly multi-functional modified asphalt concrete is obtained. The aggregate is composed of diabase crushed stones with a particle size of 5-10mm, diabase crushed stones with a particle size of 3-5mm and machine-made diabase sand with a particle size of 0-3mm; the mineral powder is limestone powder , the particle size is below 0.075mm.

Application example 2

The preparation method is basically the same as that of Application Example 1, except that in this application example, in terms of mass fraction, the raw materials for the preparation of flame-retardant, clean-odor and environment-friendly multifunctional modified asphalt are: 89.5% of 70# petroleum asphalt, 4 % granular waste plastics and waste rubber, 1.5% bio-based stabilizer material prepared in Example 1, 3.0% layered halogen-free organosilicon synergistic flame retardant, 1.5% deodorant; the layered halogen-free The organosilicon synergistic flame retardant is composed of ternary layered double metal hydroxide MgAlZn-LDHs, nano aluminum hydroxide and silicon dioxide; the ternary layered double metal hydroxide MgAlZn-LDHs, nano aluminum hydroxide and The mass ratio of silicon dioxide is 1.4:0.3:0.9; the deodorant is made up of grapefruit peel biochar material and betaine type surfactant; the mass ratio of described grapefruit peel biochar material and surfactant is 1: 0.4.

Application example 3

The preparation method is basically the same as that of Application Example 1, except that in this application example, the raw materials for the preparation of flame-retardant, clean-odor and environment-friendly multifunctional modified asphalt are: 89.4% of 70# petroleum asphalt, 4 % granular waste plastics and waste rubber, 1.5% bio-based stabilizer material prepared in Example 1, 2.0% layered halogen-free organosilicon synergistic flame retardant, 2.8% deodorant; the layered halogen-free The organosilicon synergistic flame retardant is composed of ternary layered double metal hydroxide MgAlZn-LDHs, nano aluminum hydroxide and silicon dioxide; the ternary layered double metal hydroxide MgAlZn-LDHs, nano aluminum hydroxide and The mass ratio of silicon dioxide is 1.4:0.3:0.9; the deodorant is made up of grapefruit peel biochar material and betaine type surfactant; the mass ratio of described grapefruit peel biochar material and surfactant is 1: 0.4.

Application example 4

The preparation method is basically the same as that of Application Example 1, except that in this application example, in terms of mass fraction, the raw materials for the preparation of flame-retardant, clean-odor and environment-friendly multifunctional modified asphalt are: 91.2% of 70# petroleum asphalt, 4 % granular waste plastics and waste rubber, 1.0% bio-based stabilizer material prepared in Example 1, 2.3% layered halogen-free organosilicon synergistic flame retardant, 1.5% deodorant; the layered halogen-free The organosilicon synergistic flame retardant is composed of ternary layered double metal hydroxide MgAlZn-LDHs, nano aluminum hydroxide and silicon dioxide; the ternary layered double metal hydroxide MgAlZn-LDHs, nano aluminum hydroxide and The mass ratio of silicon dioxide is 1.4:0.3:0.9; the deodorant is made up of grapefruit peel biochar material and betaine type surfactant; the mass ratio of described grapefruit peel biochar material and surfactant is 1: 0.4.

Comparative example 1

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

Comparative example 2

The same as the preparation method of Application Example 1, the only difference is that, in terms of mass fraction, the raw materials for the preparation of modified asphalt are: 91.7% of 70# petroleum asphalt, 4% of granular waste plastics and waste rubber, 1.5% Bio-based stabilizer material and 2.8% deodorant.

Comparative example 3

The same as the preparation method of Application Example 1, the only difference is that, in terms of mass fraction, the raw materials for the preparation of modified asphalt are: 90.9% of 70# petroleum asphalt, 4% of granular waste plastics and waste rubber, 2.3% The layered halogen-free silicone synergistic flame retardant and 2.8% deodorant.

Comparative example 4

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

blank group

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

test case

The asphalt concrete of the above application examples 1-4, comparative examples 1-4 and blank group were cut into asphalt concrete blocks of 70mm×70mm×10mm respectively, and the asphalt concrete blocks were put into the cone calorimeter test respectively. The radiation intensity is 50kW/m ² , and the test results are shown in Table 1. See Table 2 for the properties of the modified asphalt in Application Examples 1-4, Comparative Examples 1-4 and the blank group.

Table 1 Cone calorimeter test of asphalt concrete

Table 2 Performance indicators of asphalt with different ratios

From Tables 1 to 2, it can be seen that compared with Application Examples 1 to 4 and Comparative Examples 1 to 4, the present invention has a better deodorizing effect and flame retardancy, indicating that adding bio-based stabilizer materials, ternary layered Double metal hydroxide, nano-aluminum hydroxide and silicon dioxide can give full play to the synergistic effect of each component, achieve the effect of asphalt odor purification, and significantly improve the flame retardancy of modified asphalt. The dosage can give full play to the synergistic performance of each component, so that the obtained modified asphalt has better performance.

Compared with the modified asphalt prepared from the waste plastics and waste rubber used in the present invention and the modified asphalt prepared from styrene-butadiene-styrene used in Comparative Example 4, the waste plastics and waste rubber used in the present invention are safe and cheap , excellent performance, in line with the requirements of green environmental protection, good environmental benefits, good scalability and economic benefits.

The present invention adopts the flame-retardant, clean-odour, and environment-friendly multifunctional modified asphalt formula in Application Example 1, prepares asphalt concrete according to the method of Application Example 1, and paves the new and maintenance road sections of A, B, C and D expressways in Guangdong Province build.

Figure 1 shows that a 2.5cm asphalt surface layer was paved on the A highway bridge and roadbed section. After 10 months of opening to traffic, the road surface has no ruts and no diseases. The international smoothness index is still 0.78m/km, and the average value of the lateral force coefficient is 59. , the anti-skid performance is more stable.

Figure 2 shows that a 2.0cm asphalt thin-layer overlay was added to the B Expressway. After 9 months of opening to traffic, the international roughness IRI remained at 1.0m/km, the lateral force coefficient remained between 55 and 60, and there were no cracks and no cracks. Rutting, good high temperature stability.

Figure 3 shows that a 2.0cm asphalt thin layer overlay was added to the C expressway. After 6 months of opening to traffic, the road surface smoothness is at an excellent level (≤1.9m/km), the road rut depth RD≤5mm, and the average value of the lateral force coefficient Maintained between 56 and 59, the performance is stable.

Figure 4 shows that a 2.5cm asphalt thin layer overlay is added to the tunnel of D Expressway, and the construction site is basically smoke-free, achieving the performance characteristics of clean odor and environmental protection. Six months after opening to traffic, the road surface in the tunnel has a smoothness of IRI (≤1.2m/km), a rutting depth of 2-4mm, no rutting disease, and good high-temperature stability.

Through the analysis of the follow-up observation data of the above four newly built and maintained road sections, it can be seen that the asphalt mixture prepared by using the flame-retardant, odor-free and environmentally-friendly multifunctional modified asphalt provided by the present invention has excellent road performance, indicating that the flame-retardant provided by the present invention Odor-clean and environment-friendly multi-functional modified asphalt not only has the advantages of flame retardancy and clean odor, but also has excellent high temperature resistance.

The above is only a preferred embodiment of the present invention, it should be pointed out that, for those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, and these improvements and modifications can also be made. It should be regarded as the protection scope of the present invention.

Claims (10)

1. A bio-based stabilizer material, characterized in that the preparation raw materials 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. 2. the preparation method of bio-based stabilizer material described in claim 1, comprises the following steps: The biomass base material, the vulcanization accelerator and the insoluble sulfur are mixed to obtain the bio-based stabilizer material; the mixing temperature is 180-190°C. 3. A flame-retardant, clean-odor and environment-friendly multifunctional modified asphalt, in terms of mass fraction, the preparation raw materials include 70-94% of petroleum asphalt, 3-10% of waste plastics and waste rubber, and the bio-based stabilizer according to claim 1 0.8-2.9% of the bio-based stabilizer material prepared by the material or the preparation method described in claim 2, 0.2-4.5% of the flame retardant, and 0.3-3.8% of the deodorant. 4. The flame-retardant, odor-free and environment-friendly multifunctional modified asphalt according to claim 3, characterized in that the mass ratio of waste plastics to waste rubber is 2-3:1-2. 5. The flame-retardant, odor-free and environment-friendly multifunctional modified asphalt according to claim 3, wherein the flame retardant is a layered halogen-free organosilicon synergistic flame retardant. 6. according to claim 3 or 5 described flame retardant net odor environment-friendly multifunctional modified asphalt, it is characterized in that, described flame retardant is ternary layered double metal hydroxide, nanometer aluminum hydroxide and dioxide A mixture of silicon; the mass ratio of the ternary layered double metal hydroxide, nano aluminum hydroxide and silicon dioxide is 1-2:0.1-0.5:1-3. 7. flame retardant net smell environmental protection type multifunctional modified asphalt according to claim 3, is characterized in that, described smell net agent comprises biochar material and surfactant; The mass of described biochar material and surfactant The ratio is 0.5-1.9:0.2-0.6. 8. The flame-retardant, clean-tasting and environment-friendly multifunctional modified asphalt according to claim 7, wherein said biochar material comprises pomelo peel biochar material, orange peel biochar material and walnut shell biochar material A sort of. 9. The flame-retardant, clean-odour, and environment-friendly multifunctional modified asphalt according to claim 7, wherein said surfactants include amino acid-type surfactants, sulfonate-type surfactants and betaine-type surfactants. one of the agents. 10. The application of the flame-retardant, odor-free and environment-friendly multifunctional modified asphalt in asphalt concrete according to any one of claims 3-9.

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