Asphalt additive, and asphalt composition and preparation method therefor

Abstract

The present invention relates to the technical field of road asphalts, and disclosed are an asphalt additive, and an asphalt composition and a preparation method therefor. The asphalt additive contains a first microcapsule, a second microcapsule, and a third microcapsule, wherein the first microcapsule, the second microcapsule, and the third microcapsule each comprise a capsule core and a capsule wall, the capsule core is wrapped in the capsule wall, the capsule core contains an active component, the capsule wall thickness of the first microcapsule is 0.5-2 μm, the capsule wall thickness of the second microcapsule is greater than 2 μm and less than or equal to 3 μm, and the capsule wall thickness of the third microcapsule is greater than 3 μm and less than or equal to 5 μm. The asphalt composition of the present invention has a long storage and service life, and can effectively reduce the emission of asphalt fumes during construction, thereby reducing pollution to the environment.

Description

Asphalt additive and asphalt composition and preparation method thereof

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims the benefit of Chinese patent application No. 202311125688.1 filed on September 1, 2023, the contents of which are incorporated herein by reference. Technical Field

[0003] The present invention belongs to the technical field of road asphalt, and specifically relates to an asphalt additive and an asphalt composition and a preparation method thereof, and more specifically relates to a clean asphalt additive and a clean asphalt composition and a preparation method thereof. Background Art

[0004] As the main type of highway, asphalt pavement still uses the traditional hot-mix and hot-paving process in its pavement construction. During the construction process, the asphalt will come into contact with oxygen in the air and react: on the one hand, condensation reaction will occur to produce polycyclic aromatic hydrocarbons with larger molecular weight, which will further condense into gum and asphalt; on the other hand, asphalt molecules will undergo cracking under heat conditions to produce compounds with smaller molecular weight. These small molecular compounds will evaporate to form asphalt smoke, which will seriously disrupt the ecological balance, pollute the surrounding environment and harm human health.

[0005] Given that asphalt pavement releases volatile organic compounds (VOCs) in an unorganized manner during paving, it is difficult to collect and control the entire process. Exploring how to reduce asphalt fume release at the source, achieve clean asphalt pavement construction, and ensure the harmonious development of the transportation industry and the social economy is an urgent issue that needs to be addressed.

[0006] Chinese patent application CN101842426A reduces the odor of asphalt-like substances by adding an active agent and a diluent. However, the active agent has poor reactivity and a limited action time, and cannot function for a long time.

[0007] Chinese patent application CN109749466A reduces asphalt fume emissions through metal organic framework compounds, inorganic adsorption materials, reactive odor inhibitors, free radical scavengers, etc. However, its inorganic adsorption materials have poor compatibility with asphalt, affecting the performance of asphalt. There is also the problem of a short action time of the active components.

[0008] Chinese patent application CN103242496A discloses a room-temperature self-healing thermoplastic polymer material based on multi-layer microcapsules and a preparation method thereof. The fourth layer of the multi-layer microcapsule wall is paraffin or chlorinated paraffin, which is soluble in asphalt. The third layer of the capsule wall is silicon dioxide or titanium dioxide, which has poor compatibility with asphalt and will affect the performance of asphalt. Therefore, although it can be used to repair thermoplastic polymer materials, it is not suitable for asphalt materials.

[0009] In summary, the existing technology simply adds inorganic fillers or active components to asphalt, which may cause the inorganic fillers and asphalt to separate and stratify, and the active components have a limited action time and cannot function for a long time.

[0010] Summary of the Invention

[0011] The present invention aims to overcome the environmental pollution problem caused by the emission of asphalt fumes (including volatile organic compounds) from existing asphalt pavements. The present invention provides an asphalt additive and an asphalt composition, as well as methods for preparing the same. The asphalt composition incorporating the asphalt additive has a long shelf life and can effectively reduce asphalt fume emissions and environmental pollution during construction.

[0012] In order to achieve the above-mentioned objectives, the present invention provides an asphalt additive on the one hand, which contains a first microcapsule, a second microcapsule and a third microcapsule, wherein the first microcapsule, the second microcapsule and the third microcapsule each include a capsule core and a capsule wall, the capsule core is wrapped in the capsule wall, and the capsule core contains an active component, the capsule wall thickness of the first microcapsule is 0.5-2μm, the capsule wall thickness of the second microcapsule is greater than 2μm and less than or equal to 3μm, and the capsule wall thickness of the third microcapsule is greater than 3μm and less than or equal to 5μm.

[0013] Preferably, the mass ratio of the first microcapsule, the second microcapsule and the third microcapsule is 1:(0.25-4):(0.25-4).

[0014] Preferably, in the first microcapsule, the second microcapsule and the third microcapsule, the capsule wall includes an inner wall layer and an outer wall layer, the inner wall layer is a resin, and the outer wall layer is a rubber material.

[0015] Preferably, the mass ratio of the inner wall layer to the outer wall layer is 2.4-5:1.

[0016] Preferably, the resin is at least one of melamine resin, urea-formaldehyde resin and polymethyl methacrylate, preferably melamine resin.

[0017] Preferably, the rubber material is at least one of chlorinated rubber, styrene-butadiene rubber and chloroprene rubber.

[0018] Preferably, in the first microcapsule, the second microcapsule and the third microcapsule, the elastic modulus of the microcapsule and the thickness of the capsule wall satisfy the following formula: Y = 0.42X 2 -0.92X+T

[0019] Wherein, Y is the elastic modulus of the microcapsule, in GPa; X is the thickness of the capsule wall, in μm; T is 1±0.1;

[0020] The elastic modulus of the microcapsule is obtained by testing the mechanical properties of the microcapsule using a nanoindenter, and the thickness of the capsule wall is obtained by testing the frozen sections of the microcapsule using a scanning electron microscope.

[0021] Preferably, in the first microcapsule, the mass ratio of the capsule core to the capsule wall is 1:0.9-1.5; in the second microcapsule, the mass ratio of the capsule core to the capsule wall is 1:1.5-2.2; in the third microcapsule, the mass ratio of the capsule core to the capsule wall is 1:2.2-3.

[0022] Preferably, the active component is an inhibitor for inhibiting the release of asphalt fume, preferably at least one of aldehyde compounds, ketone compounds, alcohol compounds, phenol compounds and ester compounds.

[0023] Preferably, the aldehyde compound is selected from aliphatic aldehydes having carbon atoms greater than or equal to 7 and aromatic aldehydes having carbon atoms greater than or equal to 6, more preferably at least one of p-methylbenzaldehyde, decanal, o-carboxybenzaldehyde, p-isopropylbenzaldehyde, cinnamaldehyde, p-hydroxybenzaldehyde, p-methoxybenzaldehyde, 2-methyl-3-(3,4-methylene-dioxyphenyl)propionaldehyde, 3,4-methylenedioxybenzaldehyde, 3-(4-isopropylphenyl)-2-methylpropionaldehyde, ethyl vanillin, phenylacetaldehyde, anisaldehyde, nonadiene-2,6-aldehyde, 2,6-dimethyl-2,6-octadienal, vanillin, citronellal, neral, hydroxymethylpentylcyclohexene acetal, p-diethylaminobenzaldehyde and undecenal.

[0024] Preferably, the ketone compound is selected from aliphatic ketones having carbon atoms greater than or equal to 8 and aromatic ketones having carbon atoms greater than or equal to 8, more preferably at least one of 6-methyl-3,5-heptadien-2-one, 2-undecanone, acetophenone, ionone, irone, methylionone, damascone and dihydrodamascone.

[0025] Preferably, the alcohol compound is an alcohol having more than 6 carbon atoms, more preferably at least one of cinnamyl alcohol, menthol, cis-3,7-dimethyl-2,6-octadienol, citronellol, geraniol, myrcenol, 2,6,10-trimethyl-2,6,10-dodecatrien-12-ol, lavandulol, benzyl alcohol, 2-phenylethanol, dihydromyrcenol, tetrahydrogeraniol and nerolidol.

[0026] Preferably, the phenolic compound is a phenol having 6 or more carbon atoms, more preferably at least one of thymol, ethyl maltol, methyl maltol, 3-propenyl-6-ethoxyphenol and isoeugenol.

[0027] Preferably, the ester compound is an ester having more than 7 carbon atoms, more preferably at least one of methyl salicylate, methyl cinnamate, ethyl cinnamate, ethyl phenylacetate, methyl phenylacetate, geranyl phenylacetate, phenylethyl phenylacetate, isoamyl phenylacetate, benzyl salicylate, p-methylbenzyl acetate, benzyl acetate, isobutyl benzoate, isoamyl salicylate, benzyl cinnamate, phenylethyl cinnamate, linalyl formate, linalyl acetate, linalyl isobutyrate, menthyl acetate, terpineol acetate, and bornyl acetate.

[0028] Preferably, the active component in the first microcapsule is selected from aldehyde compounds and ketone compounds, the active component in the second microcapsule is selected from alcohol compounds and phenol compounds, and the active component in the third microcapsule is selected from ester compounds.

[0029] A second aspect of the present invention provides an asphalt composition, which contains asphalt and the asphalt additive described above.

[0030] Preferably, the content of the asphalt additive is 0.1-2 parts by weight, preferably 0.15-0.6 parts by weight, relative to 100 parts by weight of the asphalt.

[0031] Preferably, the asphalt composition further contains an antioxidant, and the content of the antioxidant is 0.01-0.1 parts by weight relative to 100 parts by weight of the asphalt.

[0032] Preferably, the antioxidant is bis(3,5-tri-tert-butyl-4-hydroxyphenyl) sulfide, p-tert-butylcatechol, 3,5-di-tert-butyl-4-hydroxybenzyl diethylphosphonate, β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate, β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate, 4,4'-thiobis(6-tert-butyl-3-methylphenol), pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate], 1,3,5- At least one of trimethyl-2,4,6-tris(3,5-di-tert-butyl-4-hydroxybenzyl)benzene, 2,6-di-tert-butyl-p-methylphenol, 3,5-di-tert-butyl-4-hydroxybenzoic acid, 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid, 3-(3,5-di-tert-butyl-4-hydroxyphenyl)acrylic acid, 3-(3,5-dimethyl-4-hydroxyphenyl)acrylic acid, 3-(3,5-dimethoxy-4-hydroxyphenyl)acrylic acid, and 3-(3-methoxy-4-hydroxyphenyl)acrylic acid.

[0033] Preferably, the asphalt is at least one of straight-run asphalt, polymer-modified asphalt and natural asphalt.

[0034] Preferably, the needle penetration of the asphalt is 30-210 1 / 10mm.

[0035] A third aspect of the present invention provides a method for preparing the above-mentioned asphalt composition, the method comprising:

[0036] (1) Prepare the first microcapsule, the second microcapsule and the third microcapsule respectively, and the preparation process is as follows:

[0037] S1, mixing the active ingredient, emulsifier and water to form an oil-in-water emulsion;

[0038] S2, reacting the oil-in-water emulsion with a resin prepolymer, and then filtering, washing, and drying to obtain a pre-coated material;

[0039] S3. In the presence of a volatile solvent, mixing the rubber material with the pre-coated material, then mixing the obtained mixture with water, and heating until the volatile solvent evaporates to obtain microcapsules;

[0040] (2) Mixing molten asphalt, the first microcapsules, the second microcapsules, the third microcapsules, and an optional antioxidant.

[0041] Preferably, in step S1, the mass ratio of the active component, the emulsifier and water is 1:(0.05-0.09):(6-9).

[0042] Preferably, in step S2, before the oil-in-water emulsion reacts with the resin prepolymer, the pH value of the oil-in-water emulsion is adjusted to below 5, preferably 2-4.

[0043] Preferably, in step S2, the resin prepolymer is a melamine resin prepolymer.

[0044] Preferably, the preparation method of the melamine resin prepolymer comprises: mixing and dissolving melamine and formaldehyde solution with water, adjusting the pH value to 7.5-9.5, and then placing the mixture in a constant temperature water bath at 60-90° C. and reacting for 0.5-3.5 hours under stirring.

[0045] Preferably, the concentration of the formaldehyde solution is 30-40 wt.%.

[0046] Preferably, the mass ratio of the melamine, the formaldehyde solution and water is 1:(2-3):(8-10).

[0047] Preferably, in step S3, the mass ratio of the rubber material, the volatile solvent and water is 1:(10-20):(50-150).

[0048] Preferably, the emulsifier is selected from at least one of sodium stearate, sodium lauryl sulfate, sodium dodecylbenzenesulfonate, cetyltrimethylammonium chloride, cetyltrimethylammonium bromide, cetyldimethylhydroxyethylammonium chloride, nonylphenol polyoxyethylene ether, octylphenol polyoxyethylene ether and hexadecane polyoxyethylene ether.

[0049] Preferably, the volatile solvent is selected from at least one of carbon tetrachloride, dichloromethane and trichloroethylene.

[0050] The asphalt additive described herein combines three microcapsules with different sustained-release rates, enabling the release of different active components at varying rates, thereby extending the duration of the active components' action. This asphalt additive, when used in asphalt compositions, extends the storage and service life of the asphalt composition, effectively reducing asphalt fume emissions and environmental pollution during construction.

[0051] In a preferred embodiment, the active ingredient in the microcapsule core is an inhibitor for suppressing asphalt fume release, and the capsule wall comprises an inner layer made of resin and an outer layer made of rubber. The outer layer's rubber material is wrapped around the inner layer in the form of a uniform, dense membrane, ensuring both strength and effective integration with asphalt, resulting in excellent compatibility. DETAILED DESCRIPTION

[0052] The following is a detailed description of the specific embodiments of the present invention. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention and are not intended to limit the present invention.

[0053] The endpoints of the ranges and any values ​​disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoints of each range, the endpoints of each range and individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered to be specifically disclosed herein.

[0054] The asphalt additive described in the present invention contains a first microcapsule, a second microcapsule and a third microcapsule, wherein the first microcapsule, the second microcapsule and the third microcapsule each include a capsule core and a capsule wall, the capsule core is wrapped in the capsule wall, and the capsule core contains active components. The capsule wall thickness of the first microcapsule is 0.5-2μm, the capsule wall thickness of the second microcapsule is greater than 2μm and less than or equal to 3μm, and the capsule wall thickness of the third microcapsule is greater than 3μm and less than or equal to 5μm.

[0055] In the first microcapsule, the second microcapsule and the third microcapsule, the elastic modulus of the microcapsule and the thickness of the capsule wall satisfy the following formula: Y=0.42X 2 -0.92X+T

[0056] Wherein, Y is the elastic modulus of the microcapsule, in GPa; X is the thickness of the capsule wall, in μm; T is 1±0.1;

[0057] The elastic modulus of the microcapsule is obtained by testing the mechanical properties of the microcapsule using a nanoindenter, and the thickness of the capsule wall is obtained by testing the frozen sections of the microcapsule using a scanning electron microscope.

[0058] In the asphalt additive described in the present invention, in the first microcapsule, the mass ratio of the capsule core to the capsule wall is 1:0.9-1.5; in the second microcapsule, the mass ratio of the capsule core to the capsule wall is 1:1.5-2.2; in the third microcapsule, the mass ratio of the capsule core to the capsule wall is 1:2.2-3.

[0059] In the microcapsule, the thickness of the capsule wall can be 0.5-5 μm, specifically, for example, 0.5 μm, 0.6 μm, 0.7 μm, 0.8 μm, 0.9 μm, 1 μm, 1.1 μm, 1.2 μm, 1.3 μm, 1.4 μm, 1.5 μm, 1.6 μm, 1.7 μm, 1.8 μm, 1.9 μm, 2 μm, 2.1 μm, 2.2 μm, 2.3 μm, 2.4 μm , 2.5μm, 2.6μm, 2.7μm, 2.8μm, 2.9μm, 3μm, 3.1μm, 3.2μm, 3.3μm, 3.4μm, 3.5μm, 3.6μm, 3.7μm m, 3.8μm, 3.9μm, 4μm, 4.1μm, 4.2μm, 4.3μm, 4.4μm, 4.5μm, 4.6μm, 4.7μm, 4.8μm, 4.9μm or 5μm.

[0060] In the microcapsule, the size of the microcapsule may be 50 μm or less, preferably 20 μm or less, and more preferably 3-15 μm.

[0061] In the microcapsules, the capsule wall preferably comprises an inner layer and an outer layer, wherein the inner layer is a resin and the outer layer is a rubber material. In this preferred embodiment, the microcapsules possess a certain strength, meeting the requirements for road use. Furthermore, the rubber material of the outer layer effectively blends with asphalt and has excellent adhesion, forming a strong bond with the resin (particularly melamine resin) of the inner layer.

[0062] Further preferably, the mass ratio of the inner wall layer to the outer wall layer is 2.4-5:1, specifically, for example, it can be 2.4:1, 2.5:1, 2.6:1, 2.7:1, 2.8:1, 2.9:1, 3:1, 3.1:1, 3.2:1, 3.3:1, 3.4:1, 3.5:1, 3.6:1, 3.7:1, 3.8:1, 3.9:1, 4:1, 4.1:1, 4.2:1, 4.3:1, 4.4:1, 4.5:1, 4.6:1, 4.7:1, 4.8:1, 4.9:1 or 4:1.

[0063] When the capsule wall of the microcapsule includes an inner wall layer and an outer wall layer, in the first microcapsule, the mass ratio of the capsule core, the inner wall layer and the outer wall layer is 1:(0.7-1):(0.2-0.3); in the second microcapsule, the mass ratio of the capsule core, the inner wall layer and the outer wall layer is 1:(1.2-1.5):(0.4-0.5); in the third microcapsule, the mass ratio of the capsule core, the inner wall layer and the outer wall layer is 1:(1.7-2):(0.6-0.7).

[0064] In the present invention, the content of the capsule core, the content of the capsule wall, and the mass of the inner layer and the outer layer of the capsule wall of the microcapsule are detected by the following method: the microcapsules are added to a volatile solvent (the volatile solvent can be selected from one or more of carbon tetrachloride, dichloromethane and trichloroethylene), fully dissolved and filtered, and the obtained first solid powder is fully dried, and the difference between the mass of the obtained first solid powder and the mass of the initial microcapsule is the mass of the capsule wall outer layer; the obtained first solid powder is further fully ground, added to toluene, fully dissolved and filtered, and the obtained second solid powder is fully dried, and the difference between the mass of the obtained second solid powder and the mass of the first solid powder is the mass of the capsule core; the mass of the capsule wall inner layer is the mass of the microcapsule minus the mass of the capsule wall outer layer and the mass of the capsule core.

[0065] In the microcapsules, the resin may be at least one of melamine resin, urea-formaldehyde resin and polymethyl methacrylate, and is most preferably melamine resin.

[0066] In the microcapsules, the rubber material may be at least one of chlorinated rubber, styrene-butadiene rubber and chloroprene rubber.

[0067] In the microcapsules, the active component is preferably an inhibitor for suppressing the release of asphalt fumes. When the active component in the microcapsules is an inhibitor for suppressing the release of asphalt fumes, the structure of the microcapsules can prolong the active component's duration of action, thereby extending the storage and service life of the asphalt composition. This can effectively reduce asphalt fume emissions and environmental pollution during asphalt construction.

[0068] In the present invention, the inhibitor for suppressing the release of asphalt fume is preferably at least one of aldehyde compounds, ketone compounds, alcohol compounds, phenol compounds and ester compounds.

[0069] In the present invention, the aldehyde compound may be at least one of an aliphatic aldehyde having 7 or more carbon atoms and an aromatic aldehyde having 6 or more carbon atoms. In a preferred embodiment, the aldehyde compound is at least one of a C7-C13 aliphatic aldehyde and a C6-C13 aromatic aldehyde. Specifically, the aldehyde compound is selected from at least one of p-methylbenzaldehyde, decanal, o-carboxybenzaldehyde, p-isopropylbenzaldehyde, cinnamaldehyde, p-hydroxybenzaldehyde, p-methoxybenzaldehyde, 2-methyl-3-(3,4-methylenedioxyphenyl)propanal, 3,4-methylenedioxybenzaldehyde, 3-(4-isopropylphenyl)-2-methylpropanal, ethyl vanillin, phenylacetaldehyde, nonadiene-2,6-aldehyde, 2,6-dimethyl-2,6-octadienal, vanillin, citronellal, neral, hydroxymethylpentylcyclohexene acetal, p-diethylaminobenzaldehyde and undecenal.

[0070] In the present invention, the ketone compound may be at least one of an aliphatic ketone having 8 or more carbon atoms and an aromatic ketone having 8 or more carbon atoms. Preferably, the ketone compound is at least one of a C8-C11 aliphatic ketone and a C8-C14 aromatic ketone. Specifically, the ketone compound is selected from at least one of 6-methyl-3,5-heptadien-2-one, 2-undecanone, acetophenone, ionone, irone, methylionone, damascone, and dihydrodamascone.

[0071] In the present invention, the alcohol compound is an alcohol having more than 6 carbon atoms, preferably a C7-C15 alcohol. Specifically, the alcohol compound is at least one of cinnamyl alcohol, menthol, cis-3,7-dimethyl-2,6-octadienol, citronellol, geraniol, myrcenol, 2,6,10-trimethyl-2,6,10-dodecatrien-12-ol, lavandulol, benzyl alcohol, 2-phenylethanol, dihydromyrcenol, tetrahydrogeraniol, and nerolidol.

[0072] In the present invention, the phenolic compound is a phenol having 6 or more carbon atoms, preferably a C6-C15 phenol. Specifically, the phenolic compound is at least one of thymol, ethyl maltol, methyl maltol, 3-propenyl-6-ethoxyphenol and isoeugenol.

[0073] In the present invention, the ester compound is an ester having more than 7 carbon atoms, preferably a C8-C17 ester. Specifically, the ester compound is at least one of methyl salicylate, methyl cinnamate, ethyl cinnamate, ethyl phenylacetate, methyl phenylacetate, geranyl phenylacetate, phenylethyl phenylacetate, isoamyl phenylacetate, benzyl salicylate, p-methylbenzyl acetate, benzyl acetate, isobutyl benzoate, isoamyl salicylate, benzyl cinnamate, phenylethyl cinnamate, linalyl formate, linalyl acetate, linalyl isobutyrate, menthyl acetate, terpineol acetate, and bornyl acetate.

[0074] In the asphalt additive described herein, preferably, the active component in the first microcapsules is selected from aldehydes and ketones, the active component in the second microcapsules is selected from alcohols and phenols, and the active component in the third microcapsules is selected from esters. This configuration of the active components in the various microcapsules allows for different sustained-release rates, significantly improving the suppression of asphalt fume emissions.

[0075] In the asphalt additive of the present invention, preferably, the mass ratio of the first microcapsule, the second microcapsule and the third microcapsule is 1:(0.25-4):(0.25-4).

[0076] The asphalt composition of the present invention comprises asphalt and the asphalt additive described above. The addition of the asphalt additive to the asphalt composition of the present invention provides it with a longer storage and service life, effectively reducing asphalt fume emissions and environmental pollution during construction.

[0077] In the asphalt composition of the present invention, the content of the microcapsules may be 0.1-2 parts by weight, preferably 0.15-0.6 parts by weight, relative to 100 parts by weight of the asphalt.

[0078] In the present invention, the asphalt composition may further contain an antioxidant. The content of the antioxidant may be selected conventionally in the art. Specifically, the content of the antioxidant may be 0.01-0.1 parts by weight, preferably 0.02-0.08 parts by weight, relative to 100 parts by weight of the asphalt.

[0079] In the asphalt composition of the present invention, the asphalt may be at least one of straight-run asphalt, polymer-modified asphalt, and natural asphalt. Preferably, the asphalt has a needle penetration of 30-210 1 / 10 mm.

[0080] In the asphalt composition of the present invention, the antioxidant can be a conventional choice in the art. Preferably, the antioxidant is bis(3,5-tri-tert-butyl-4-hydroxyphenyl) sulfide, p-tert-butylcatechol, 3,5-di-tert-butyl-4-hydroxybenzyl diethylphosphonate, β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate, β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate, 4,4'-thiobis(6-tert-butyl-3-methylphenol), pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate], 1,3,5 -At least one of trimethyl-2,4,6-tris(3,5-di-tert-butyl-4-hydroxybenzyl)benzene, 2,6-di-tert-butyl-p-methylphenol, 3,5-di-tert-butyl-4-hydroxybenzoic acid, 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid, 3-(3,5-di-tert-butyl-4-hydroxyphenyl)acrylic acid, 3-(3,5-dimethyl-4-hydroxyphenyl)acrylic acid, 3-(3,5-dimethoxy-4-hydroxyphenyl)acrylic acid and 3-(3-methoxy-4-hydroxyphenyl)acrylic acid.

[0081] The preparation method of the above-mentioned asphalt composition may include:

[0082] (1) Prepare the first microcapsule, the second microcapsule and the third microcapsule respectively, and the preparation process is as follows:

[0083] S1, mixing the active ingredient, emulsifier and water to form an oil-in-water emulsion;

[0084] S2, reacting the oil-in-water emulsion with a resin prepolymer, and then filtering, washing, and drying to obtain a pre-coated material;

[0085] S3. In the presence of a volatile solvent, mixing the rubber material with the pre-coated material, then mixing the obtained mixture with water, and heating until the volatile solvent evaporates to obtain microcapsules;

[0086] (2) Mixing molten asphalt, the first microcapsules, the second microcapsules, the third microcapsules, and an optional antioxidant.

[0087] In step S1, the mixing process may be performed in a shearing machine, and the operating conditions may include: a rotation speed of 2000-4000 r / min and a time of 20-30 min.

[0088] In step S1, the mass ratio of the active component, the emulsifier and water can be 1: (0.05-0.09): (6-9).

[0089] In some embodiments, the operation process of step S1 is: dissolving the active ingredient in water, then adding the emulsifier, and then performing high-speed shear emulsification at a rotation speed of 2000-4000 r / min.

[0090] In step S2, before the oil-in-water emulsion reacts with the resin prepolymer, the pH value of the oil-in-water emulsion is adjusted to below 5, preferably 2 to 4. The reagent used to adjust the pH value can be a conventional inorganic acid solution, such as dilute hydrochloric acid.

[0091] In step S2, the reaction of the oil-in-water emulsion and the resin prepolymer is carried out under stirring. The stirring speed may be 400-800 r / min, the reaction temperature may be 60-90° C., and the reaction time may be 1-5 h.

[0092] In step S2, the filtration process may be suction filtration.

[0093] In step S2, the washing process may include washing with water and ethanol twice or more respectively.

[0094] In step S2, the drying process can be carried out in an oven, the drying temperature can be 60-90°C, and the drying time can be 5-10 hours.

[0095] In step S2, the resin prepolymer may be one or more of a melamine resin prepolymer, a urea-formaldehyde resin prepolymer, and a polymethyl methacrylate prepolymer. Preferably, the resin prepolymer is a melamine resin prepolymer. The method for preparing the melamine resin prepolymer may include: mixing and dissolving melamine and formaldehyde solution with water, adjusting the pH value to 7.5-9.5, and then placing the mixture in a constant temperature water bath at 60-90°C and stirring for a reaction of 0.5-3.5 hours. During the preparation of the melamine resin prepolymer, the concentration of the formaldehyde solution may be 30-40 wt.%. The mass ratio of the melamine, formaldehyde solution, and water may be 1:(2-3):(8-10).

[0096] In step S3, the mass ratio of the rubber material, the volatile solvent and water may be 1:(10-20):(50-150).

[0097] In the method of the present invention, the active component can be selected from one or any combination of at least two of aldehyde compounds, ketone compounds, alcohol compounds, phenolic compounds, and ester compounds. Specifically, the aldehyde compound, ketone compound, alcohol compound, phenolic compound, and ester compound are selected from the same materials as described above.

[0098] In the method of the present invention, the rubber material may be at least one of chlorinated rubber, styrene-butadiene rubber and chloroprene rubber.

[0099] In the method of the present invention, the emulsifier can be selected from at least one of sodium stearate, sodium lauryl sulfate, sodium dodecylbenzenesulfonate, cetyltrimethylammonium chloride, cetyltrimethylammonium bromide, cetyldimethylhydroxyethylammonium chloride, nonylphenol polyoxyethylene ether, octylphenol polyoxyethylene ether and hexadecane polyoxyethylene ether.

[0100] In the method of the present invention, the volatile solvent can be selected from at least one of carbon tetrachloride, dichloromethane and trichloroethylene.

[0101] The asphalt additive and asphalt composition and their preparation methods of the present invention are further illustrated by the following examples. The examples are implemented based on the technical solution of the present invention and provide detailed implementation methods and specific operating processes, but the scope of protection of the present invention is not limited to the following examples.

[0102] The experimental methods in the following examples, unless otherwise specified, are all conventional methods in the art. The experimental materials used in the following examples, unless otherwise specified, are all commercially available.

[0103] Example 1

[0104] (1) 1 part by weight of 3,4-methylenedioxybenzaldehyde was added to 9 parts by weight of water at 60°C, and 0.05 parts by weight of hexadecyltrimethylammonium bromide was added. The mixture was sheared and emulsified at 2000 r / min for 30 minutes to form an oil-in-water emulsion L-A1 in the aqueous phase.

[0105] 1 part by weight of myrcenol was added to 9 parts by weight of water at 60° C., and 0.05 parts by weight of cetyltrimethylammonium bromide was added. The mixture was sheared and emulsified at 2000 r / min for 30 minutes to form an oil-in-water emulsion L-A2 in the aqueous phase.

[0106] 1 part by weight of ethyl cinnamate was added to 9 parts by weight of water at 60°C, and 0.05 parts by weight of hexadecyltrimethylammonium bromide was added. The mixture was emulsified at a shearing speed of 2000 r / min for 30 minutes to form an oil-in-water emulsion L-A3 in the aqueous phase.

[0107] (2) 1 part by weight of melamine, 2 parts by weight of a 37 wt.% formaldehyde solution, and 8 parts by weight of deionized water were fully dissolved in a three-necked flask, and the pH value was adjusted to 8.5. The flask was then placed in a constant temperature water bath at 60° C. and stirred at 800 rpm for 0.5 h to obtain a melamine resin prepolymer.

[0108] Dilute hydrochloric acid was added dropwise to 1 part by weight of the oil-in-water emulsion L-A1 to adjust the pH value to 2. 0.10 parts by weight of the prepared melamine resin prepolymer was slowly added dropwise to the oil-in-water emulsion, stirred at 700 r / min, and reacted at 75°C for 2 hours. After the reaction, the obtained mixed solution was filtered, washed twice with water and ethanol respectively, and placed in an oven to dry at 60°C for 10 hours to obtain the pre-coated material Y-A1.

[0109] Dilute hydrochloric acid was added dropwise to 1 part by weight of the oil-in-water emulsion L-A2 to adjust the pH value to 2. 0.12 parts by weight of the prepared melamine resin prepolymer was slowly added dropwise to the oil-in-water emulsion, stirred at 700 r / min, and reacted at 75°C for 2 hours. After the reaction, the obtained mixed solution was filtered, washed twice with water and ethanol respectively, and placed in an oven to dry at 60°C for 10 hours to obtain the pre-coated material Y-A2.

[0110] Dilute hydrochloric acid was added dropwise to 1 part by weight of the oil-in-water emulsion L-A3 to adjust the pH value to 2. 0.17 parts by weight of the prepared melamine resin prepolymer was slowly added dropwise to the oil-in-water emulsion, stirred at 700 r / min, and reacted at 75°C for 2 hours. After the reaction, the obtained mixed solution was filtered, washed twice with water and ethanol respectively, and placed in an oven at 60°C for 10 hours to obtain the pre-coated material Y-A3.

[0111] (3) 0.1 parts by weight of chlorinated rubber was dissolved in 1 part by weight of dichloromethane, and 1.00 parts by weight of the pre-coated material Y-A1 was added and stirred thoroughly. The resulting mixture was added to 5 parts by weight of water, stirred at 500 r / min, and the temperature was increased until the solvent evaporated to obtain microcapsules W-A1, which had a size of 3-5 μm, an elastic modulus of 0.5 GPa, and a capsule wall thickness of 1.2 μm, which met the calculation formula Y = 0.42X 2 -0.92X+T. According to the test, the content of the capsule core in the microcapsule is 45 wt.%, the content of the capsule wall is 55 wt.%, and the mass ratio of the inner layer to the outer layer in the capsule wall is 5:1.

[0112] 0.1 parts by weight of chlorinated rubber was dissolved in 1 part by weight of dichloromethane, and 0.55 parts by weight of the pre-coated material Y-A2 was added and thoroughly stirred. The resulting mixture was added to 5 parts by weight of water and stirred at 500 rpm. The temperature was raised until the solvent evaporated to obtain microcapsules W-A2, which had a size of 5-7 μm, an elastic modulus of 0.9 GPa, and a capsule wall thickness of 2.1 μm, which met the calculation formula Y = 0.42X 2 -0.92X+T. According to the test, the content of the capsule core in the microcapsule is 38 wt.%, the content of the capsule wall is 62 wt.%, and the mass ratio of the inner layer to the outer layer in the capsule wall is 3:1.

[0113] 0.1 parts by weight of chlorinated rubber was dissolved in 1 part by weight of dichloromethane, and 0.43 parts by weight of the pre-coated material Y-A3 was added and thoroughly stirred. The resulting mixture was added to 5 parts by weight of water and stirred at 500 rpm. The temperature was raised until the solvent evaporated to obtain microcapsules W-A3, which had a size of 7-9 μm, an elastic modulus of 2.2 GPa, and a capsule wall thickness of 3.1 μm, which met the calculation formula Y = 0.42X 2 -0.92X+T. According to the test, the content of the capsule core in the microcapsule is 30 wt.%, the content of the capsule wall is 70 wt.%, and the mass ratio of the inner layer to the outer layer in the capsule wall is 2.7:1.

[0114] (4) 0.2 parts by weight of the prepared microcapsules W-A1, 0.05 parts by weight of the microcapsules W-A2, 0.1 parts by weight of the microcapsules W-A3, and 0.1 parts by weight of 3-(3,5-dimethyl-4-hydroxyphenyl)acrylic acid were added to 100 parts by weight of straight-run asphalt (penetration 70 1 / 10 mm), and the mixture was heated at 150°C and stirred at 800 r / min for 3 hours to obtain an asphalt composition P1.

[0115] Example 2

[0116] (1) 1 part by weight of ionone was added to 7 parts by weight of water at 60°C, and 0.06 parts by weight of nonylphenol polyoxyethylene ether was added. The mixture was sheared and emulsified at 2500 r / min for 25 minutes to form an oil-in-water emulsion L-B1 in the aqueous phase.

[0117] 1 part by weight of myrcenol was added to 7 parts by weight of water at 60° C., and 0.06 parts by weight of nonylphenol polyoxyethylene ether was added. The mixture was sheared and emulsified at 2500 r / min for 25 minutes to form an oil-in-water emulsion L-B2 in the aqueous phase.

[0118] 1 part by weight of phenylethyl cinnamate was added to 7 parts by weight of water at 60°C, and 0.06 parts by weight of nonylphenol polyoxyethylene ether was added. The mixture was emulsified at a shearing speed of 2500 r / min for 25 minutes to form an oil-in-water emulsion L-B3 in the aqueous phase.

[0119] (2) 1 part by weight of melamine, 3 parts by weight of a 37 wt.% formaldehyde solution, and 10 parts by weight of deionized water were fully dissolved in a three-necked flask, and the pH value was adjusted to 7.5. The flask was then placed in a constant temperature water bath at 80°C and stirred at 600 r / min for 1 hour to obtain a melamine resin prepolymer.

[0120] Dilute hydrochloric acid was added dropwise to 1 part by weight of the oil-in-water emulsion L-B1 to adjust the pH value to 4. 0.12 parts by weight of the prepared melamine resin prepolymer was slowly added dropwise to the oil-in-water emulsion, stirred at 600 r / min, and reacted at 70°C for 3 hours. After the reaction, the obtained mixed solution was filtered, washed twice with water and ethanol respectively, and placed in an oven to dry at 70°C for 8 hours to obtain the pre-coated material Y-B1.

[0121] Dilute hydrochloric acid was added dropwise to 1 part by weight of the oil-in-water emulsion L-B2 to adjust the pH value to 4. 0.17 parts by weight of the prepared melamine resin prepolymer was slowly added dropwise to the oil-in-water emulsion, stirred at 600 r / min, and reacted at 70°C for 3 hours. After the reaction, the obtained mixed solution was filtered, washed twice with water and ethanol respectively, and placed in an oven to dry at 70°C for 8 hours to obtain the pre-coated material Y-B2.

[0122] Dilute hydrochloric acid was added dropwise to 1 part by weight of the oil-in-water emulsion L-B3 to adjust the pH value to 4. 0.22 parts by weight of the prepared melamine resin prepolymer was slowly added dropwise to the oil-in-water emulsion, stirred at 600 r / min, and reacted at 70°C for 3 hours. After the reaction, the obtained mixed solution was filtered, washed twice with water and ethanol respectively, and placed in an oven to dry at 70°C for 8 hours to obtain the pre-coated material Y-B3.

[0123] (3) 0.15 parts by weight of chloroprene rubber was dissolved in 3 parts by weight of carbon tetrachloride, and 1.40 parts by weight of the pre-coated material Y-B1 was added and thoroughly stirred. The resulting mixture was added to 10 parts by weight of water, stirred at 600 r / min, and the temperature was raised until the solvent evaporated to obtain microcapsules W-B1, which had a size of 2-4 μm, an elastic modulus of 0.6 GPa, and a capsule wall thickness of 0.7 μm, which met the calculation formula Y = 0.42X 2 -0.92X+T. According to the test, the content of the capsule core in the microcapsule is 46 wt.%, the content of the capsule wall is 54 wt.%, and the mass ratio of the inner layer to the outer layer in the capsule wall is 4.6:1.

[0124] 0.15 parts by weight of chloroprene rubber was dissolved in 3 parts by weight of carbon tetrachloride, and 0.80 parts by weight of the pre-coated material Y-B2 was added and thoroughly stirred. The resulting mixture was added to 10 parts by weight of water and stirred at 600 rpm. The temperature was raised until the solvent evaporated to obtain microcapsules W-B2, which had a size of 5-7 μm, an elastic modulus of 0.9 GPa, and a capsule wall thickness of 2.1 μm, which met the calculation formula Y = 0.42X 2 -0.92X+T. According to the test, the content of the capsule core in the microcapsule is 36 wt.%, the content of the capsule wall is 64 wt.%, and the mass ratio of the inner layer to the outer layer in the capsule wall is 3.1:1.

[0125] 0.15 parts by weight of chloroprene rubber was dissolved in 3 parts by weight of carbon tetrachloride, and 0.70 parts by weight of the pre-coated material Y-B3 was added and thoroughly stirred. The resulting mixture was added to 10 parts by weight of water and stirred at 600 rpm. The temperature was raised until the solvent evaporated to obtain microcapsules W-B3, which had a size of 7-9 μm, an elastic modulus of 2.4 GPa, and a capsule wall thickness of 3.2 μm, which met the calculation formula Y = 0.42X 2 -0.92X+T. According to the test, the content of the capsule core in the microcapsule is 30 wt.%, the content of the capsule wall is 70 wt.%, and the mass ratio of the inner layer to the outer layer in the capsule wall is 3.0:1.

[0126] (4) 0.05 parts by weight of the prepared microcapsules W-B1, 0.2 parts by weight of the microcapsules W-B2, 0.1 parts by weight of the microcapsules W-B3, and 0.05 parts by weight of 3,5-di-tert-butyl-4-hydroxybenzyl diethylphosphonate were added to 100 parts by weight of straight-run asphalt (penetration 70 1 / 10 mm), and the mixture was heated at 140°C and stirred at 900 r / min for 3 hours to obtain an asphalt composition P2.

[0127] Example 3

[0128] (1) 0.5 parts by weight of 2,6-dimethyl-2,6-octadienal and 0.5 parts by weight of neral were added to 6 parts by weight of water at 60°C, and 0.09 parts by weight of octylphenol polyoxyethylene ether were added. The mixture was emulsified at a shearing speed of 3000 r / min for 20 minutes to form an oil-in-water emulsion L-C1 in the aqueous phase.

[0129] 1 part by weight of dihydromyrcenol was added to 6 parts by weight of water at 60° C., and 0.09 parts by weight of octylphenol polyoxyethylene ether was added. The mixture was sheared and emulsified at 3000 r / min for 20 minutes to form an oil-in-water emulsion L-C2 in the aqueous phase.

[0130] 1 part by weight of linalyl formate was added to 6 parts by weight of water at 60° C., and 0.09 parts by weight of octylphenol polyoxyethylene ether was added. The mixture was sheared and emulsified at 3000 r / min for 20 minutes to form an oil-in-water emulsion L-C3 in the aqueous phase.

[0131] (2) 1 part by weight of melamine, 2 parts by weight of a 37 wt.% formaldehyde solution, and 9 parts by weight of deionized water were fully dissolved in a three-necked flask, and the pH value was adjusted to 8. The flask was then placed in a constant temperature water bath at 70°C and stirred at 500 rpm for 2 hours to obtain a melamine resin prepolymer.

[0132] Dilute hydrochloric acid was added dropwise to 1 part by weight of the oil-in-water emulsion L-C1 to adjust the pH value to 3. 0.14 parts by weight of the prepared melamine resin prepolymer was slowly added dropwise to the oil-in-water emulsion, stirred at 500 r / min, and reacted at 65°C for 3 hours. After the reaction, the obtained mixed solution was filtered, washed twice with water and ethanol respectively, and placed in an oven at 90°C for 6 hours to obtain the pre-coated material Y-C1.

[0133] Dilute hydrochloric acid was added dropwise to 1 part by weight of the oil-in-water emulsion L-C2 to adjust the pH value to 3. 0.18 parts by weight of the prepared melamine resin prepolymer was slowly added dropwise to the oil-in-water emulsion, stirred at 500 r / min, and reacted at 65°C for 3 hours. After the reaction, the obtained mixed solution was filtered, washed twice with water and ethanol respectively, and placed in an oven to dry at 90°C for 6 hours to obtain the pre-coated material Y-C2.

[0134] Dilute hydrochloric acid was added dropwise to 1 part by weight of the oil-in-water emulsion L-C3 to adjust the pH value to 3. 0.28 parts by weight of the prepared melamine resin prepolymer was slowly added dropwise to the oil-in-water emulsion, stirred at 500 r / min, and reacted at 65°C for 3 hours. After the reaction, the obtained mixed solution was filtered, washed twice with water and ethanol respectively, and placed in an oven at 90°C for 6 hours to obtain the pre-coated material Y-C3.

[0135] (3) 0.2 parts by weight of styrene-butadiene rubber was dissolved in 3 parts by weight of dichloromethane, and 1.34 parts by weight of the pre-coated material Y-C1 was added and stirred thoroughly. The resulting mixture was added to 25 parts by weight of water, stirred at 700 r / min, and the temperature was raised until the solvent evaporated to obtain microcapsules W-C1, which had a size of 3-5 μm, an elastic modulus of 0.6 GPa, and a capsule wall thickness of 1.3 μm, which met the calculation formula Y = 0.42X 2 -0.92X+T. According to the test, the content of the capsule core in the microcapsule is 44 wt.%, the content of the capsule wall is 56 wt.%, and the mass ratio of the inner layer to the outer layer in the capsule wall is 3.3:1.

[0136] 0.2 parts by weight of styrene-butadiene rubber was dissolved in 3 parts by weight of dichloromethane, and 0.90 parts by weight of the pre-coated material Y-C2 was added and thoroughly stirred. The resulting mixture was added to 25 parts by weight of water and stirred at 700 rpm. The temperature was raised until the solvent evaporated to obtain microcapsules W-C2, which had a size of 5-7 μm, an elastic modulus of 1.1 GPa, and a capsule wall thickness of 2.3 μm, which met the calculation formula Y = 0.42X 2 -0.92X+T. According to the test, the content of the capsule core in the microcapsule is 36 wt.%, the content of the capsule wall is 64 wt.%, and the mass ratio of the inner layer to the outer layer in the capsule wall is 2.5:1.

[0137] 0.2 parts by weight of styrene-butadiene rubber was dissolved in 3 parts by weight of dichloromethane, and 0.85 parts by weight of the pre-coated material Y-C3 was added and thoroughly stirred. The resulting mixture was added to 25 parts by weight of water and stirred at 700 rpm. The temperature was raised until the solvent evaporated to obtain microcapsules W-C3, which had a size of 7-9 μm, an elastic modulus of 2.7 GPa, and a capsule wall thickness of 3.4 μm, which met the calculation formula Y = 0.42X 2 -0.92X+T. According to the test, the content of the capsule core in the microcapsule is 27 wt.%, the content of the capsule wall is 73 wt.%, and the mass ratio of the inner layer to the outer layer in the capsule wall is 2.8:1.

[0138] (4) 0.1 parts by weight of the prepared microcapsules W-C1, 0.1 parts by weight of the microcapsules W-C2, 0.2 parts by weight of the microcapsules W-C3, 0.05 parts by weight of 2,6-di-tert-butyl-p-methylphenol, and 0.05 parts by weight of bis(3,5-tri-tert-butyl-4-hydroxyphenyl) sulfide were added to 100 parts by weight of SBS modified asphalt (penetration 60 1 / 10 mm), and the mixture was heated at 170°C and stirred at 500 r / min for 1 hour to obtain an asphalt composition P3.

[0139] Example 4

[0140] (1) 1 part by weight of p-anisaldehyde was added to 8 parts by weight of water at 60° C., and 0.06 parts by weight of sodium dodecylbenzenesulfonate was added. The mixture was emulsified at a shearing speed of 4000 r / min for 20 minutes to form an oil-in-water emulsion L-D1 in the aqueous phase.

[0141] 1 part by weight of thymol was added to 8 parts by weight of water at 60° C., and 0.06 parts by weight of sodium dodecylbenzenesulfonate was added. The mixture was sheared and emulsified at 4000 r / min for 20 minutes to form an oil-in-water emulsion L-D2 in the aqueous phase.

[0142] 1 part by weight of methyl phenylacetate was added to 8 parts by weight of water at 60° C., and 0.06 parts by weight of sodium dodecylbenzenesulfonate was added. The mixture was sheared and emulsified at 4000 r / min for 20 minutes to form an oil-in-water emulsion L-D3 in the aqueous phase.

[0143] (2) 1 part by weight of melamine, 3 parts by weight of a 37 wt.% formaldehyde solution, and 9 parts by weight of deionized water were fully dissolved in a three-necked flask, and the pH value was adjusted to 7.5. The flask was then placed in a constant temperature water bath at 60° C. and stirred at 700 rpm for 2 h to obtain a melamine resin prepolymer.

[0144] Dilute hydrochloric acid was added dropwise to 1 part by weight of the oil-in-water emulsion L-D1 to adjust the pH value to 3. 0.11 parts by weight of the prepared melamine resin prepolymer was slowly added dropwise to the oil-in-water emulsion, stirred at 500 r / min, and reacted at 60°C for 5 hours. After the reaction, the obtained mixed solution was filtered, washed twice with water and ethanol respectively, and placed in an oven at 90°C for 6 hours to obtain the pre-coated material Y-D1.

[0145] Dilute hydrochloric acid was added dropwise to 1 part by weight of the oil-in-water emulsion L-D2 to adjust the pH value to 3. 0.15 parts by weight of the prepared melamine resin prepolymer was slowly added dropwise to the oil-in-water emulsion, stirred at 500 r / min, and reacted at 60°C for 5 hours. After the reaction, the obtained mixed solution was filtered, washed twice with water and ethanol respectively, and placed in an oven at 90°C for 6 hours to obtain the pre-coated material Y-D2.

[0146] Dilute hydrochloric acid was added dropwise to 1 part by weight of the oil-in-water emulsion L-D3 to adjust the pH value to 3. 0.21 parts by weight of the prepared melamine resin prepolymer was slowly added dropwise to the oil-in-water emulsion, stirred at 500 r / min, and reacted at 60°C for 5 hours. After the reaction, the obtained mixed solution was filtered, washed twice with water and ethanol respectively, and placed in an oven at 90°C for 6 hours to obtain the pre-coated material Y-D3.

[0147] (3) 0.17 parts by weight of chlorinated rubber was dissolved in 1.7 parts by weight of dichloromethane, and 1.69 parts by weight of the pre-coated material Y-D1 was added and thoroughly stirred. The resulting mixture was added to 18 parts by weight of water, stirred at 800 r / min, and the temperature was increased until the solvent evaporated to obtain microcapsules W-D1, which had a size of 3-5 μm, an elastic modulus of 0.5 GPa, and a capsule wall thickness of 1.2 μm, which met the calculation formula Y = 0.42X 2 -0.92X+T. According to the test, the content of the capsule core in the microcapsule is 46 wt.%, the content of the capsule wall is 54 wt.%, and the mass ratio of the inner layer to the outer layer in the capsule wall is 4.9:1.

[0148] 0.17 parts by weight of chlorinated rubber was dissolved in 1.7 parts by weight of dichloromethane, and 0.80 parts by weight of the pre-coated material Y-D2 was added and thoroughly stirred. The resulting mixture was added to 18 parts by weight of water and stirred at 800 rpm. The temperature was raised until the solvent evaporated to obtain microcapsules W-D2, which had a size of 5-7 μm, an elastic modulus of 1.2 GPa, and a capsule wall thickness of 2.4 μm, which met the calculation formula Y = 0.42X 2 -0.92X+T. According to the test, the content of the capsule core in the microcapsule is 35 wt.%, the content of the capsule wall is 65 wt.%, and the mass ratio of the inner layer to the outer layer in the capsule wall is 2.7:1.

[0149] 0.17 parts by weight of chlorinated rubber was dissolved in 1.7 parts by weight of dichloromethane, and 0.70 parts by weight of the pre-coating material Y-D3 was added and thoroughly stirred. The resulting mixture was added to 18 parts by weight of water and stirred at 800 rpm. The temperature was increased until the solvent evaporated, resulting in microcapsules W-D3 with a size of 7-9 μm, an elastic modulus of 2.5 GPa, and a capsule wall thickness of 3.3 μm, which conformed to the calculation formula Y = 0.42X 2 -0.92X+T. According to the test, the content of the capsule core in the microcapsule is 28 wt.%, the content of the capsule wall is 72 wt.%, and the mass ratio of the inner layer to the outer layer in the capsule wall is 2.7:1.

[0150] (4) 0.1 parts by weight of the prepared microcapsules W-D1, 0.2 parts by weight of the microcapsules W-D2, 0.2 parts by weight of the microcapsules W-D3, 0.05 parts by weight of 3,5-di-tert-butyl-4-hydroxybenzyl diethylphosphonate, and 0.05 parts by weight of p-tert-butylcatechol were added to 100 parts by weight of natural asphalt (penetration 50 1 / 10 mm) and straight-run asphalt (penetration 70 1 / 10 mm), and the mixture was heated at 160°C and stirred at 800 r / min for 2 h to obtain an asphalt composition P4.

[0151] Example 5

[0152] (1) 1 part by weight of methyl ionone was added to 7 parts by weight of water at 60°C, and 0.08 parts by weight of hexadecyltrimethylammonium chloride was added. The mixture was sheared and emulsified at 3000 r / min for 30 minutes to form an oil-in-water emulsion L-E1 in the aqueous phase.

[0153] 1 part by weight of 3-propenyl-6-ethoxyphenol was added to 7 parts by weight of water at 60°C, and 0.08 parts by weight of hexadecyltrimethylammonium chloride was added. The mixture was emulsified at a shearing speed of 3000 r / min for 30 minutes to form an oil-in-water emulsion L-E2 in the aqueous phase.

[0154] 1 part by weight of pine acetate was added to 7 parts by weight of water at 60°C, and 0.08 parts by weight of hexadecyltrimethylammonium chloride was added. The mixture was emulsified at a shearing speed of 3000 r / min for 30 minutes to form an oil-in-water emulsion L-E3 in the aqueous phase.

[0155] (2) 1 part by weight of melamine, 2 parts by weight of a 37% formaldehyde solution, and 9 parts by weight of deionized water were fully dissolved in a three-necked flask, and the pH value was adjusted to 8. The flask was then placed in a constant temperature water bath at 90°C and stirred at 400 r / min for 3.5 hours to obtain a melamine resin prepolymer.

[0156] Dilute hydrochloric acid was added dropwise to 1 part by weight of the oil-in-water emulsion L-E1 to adjust the pH value to 2. 0.10 parts by weight of the prepared melamine resin prepolymer was slowly added dropwise to the oil-in-water emulsion, stirred at 800 r / min, and reacted at 90°C for 1 hour. After the reaction, the obtained mixed solution was filtered, washed twice with water and ethanol respectively, and placed in an oven to dry at 60°C for 9 hours to obtain the pre-coated material Y-E1.

[0157] Dilute hydrochloric acid was added dropwise to 1 part by weight of the oil-in-water emulsion L-E2 to adjust the pH value to 2. 0.15 parts by weight of the prepared melamine resin prepolymer was slowly added dropwise to the oil-in-water emulsion, stirred at 800 r / min, and reacted at 90°C for 1 hour. After the reaction, the obtained mixed solution was filtered, washed twice with water and ethanol respectively, and placed in an oven to dry at 60°C for 9 hours to obtain the pre-coated material Y-E2.

[0158] Dilute hydrochloric acid was added dropwise to 1 part by weight of the oil-in-water emulsion L-E3 to adjust the pH value to 2. 0.22 parts by weight of the prepared melamine resin prepolymer was slowly added dropwise to the oil-in-water emulsion, stirred at 800 r / min, and reacted at 90°C for 1 hour. After the reaction, the obtained mixed solution was filtered, washed twice with water and ethanol respectively, and placed in an oven to dry at 60°C for 9 hours to obtain the pre-coated material Y-E3.

[0159] (3) Dissolve 0.25 parts by weight of chlorinated rubber in 5 parts by weight of dichloromethane, add 1.48 parts by weight of the pre-coated material Y-E1, and stir thoroughly. Add the resulting mixture to 30 parts by weight of water, stir at 700 r / min, and increase the temperature until the solvent evaporates to obtain microcapsules W-E1, which have a size of 3-5 μm, an elastic modulus of 0.6 GPa, and a capsule wall thickness of 0.8 μm, which conforms to the calculation formula Y=0.42X2-0.92X+T. Detection revealed that the capsule core content in the microcapsule was 48 wt.%, the capsule wall content was 52 wt.%, and the mass ratio of the inner layer to the outer layer in the capsule wall was 2.6:1.

[0160] 0.25 parts by weight of chlorinated rubber was dissolved in 5 parts by weight of dichloromethane, and 1.37 parts by weight of the pre-coated material Y-E2 was added and thoroughly stirred. The resulting mixture was added to 30 parts by weight of water, stirred at 700 r / min, and the temperature was increased until the solvent evaporated to obtain microcapsules W-E2, which had a size of 5-7 μm, an elastic modulus of 1.0 GPa, and a capsule wall thickness of 2.2 μm, which conformed to the calculation formula Y = 0.42X2-0.92X+T. Through testing, it was found that the content of the capsule core in the microcapsule was 37 wt.%, the content of the capsule wall was 63 wt.%, and the mass ratio of the inner layer to the outer layer in the capsule wall was 2.6:1.

[0161] 0.25 parts by weight of chlorinated rubber was dissolved in 5 parts by weight of dichloromethane, and 0.98 parts by weight of the pre-coated material Y-E3 was added and thoroughly stirred. The resulting mixture was added to 30 parts by weight of water, stirred at 700 r / min, and the temperature was increased until the solvent evaporated to obtain microcapsules W-E3, which had a size of 7-9 μm, an elastic modulus of 2.4 GPa, and a capsule wall thickness of 3.2 μm, which conformed to the calculation formula Y = 0.42X2-0.92X+T. Through testing, it was found that the content of the capsule core in the microcapsule was 29 wt.%, the content of the capsule wall was 71 wt.%, and the mass ratio of the inner layer to the outer layer in the capsule wall was 2.5:1.

[0162] (4) 0.2 parts by weight of the prepared microcapsules W-E1, 0.2 parts by weight of the microcapsules W-E2, 0.2 parts by weight of the microcapsules W-E3, 0.05 parts by weight of 3-(3,5-di-tert-butyl-4-hydroxyphenyl)acrylic acid, and 0.05 parts by weight of 3-(3,5-dimethyl-4-hydroxyphenyl)acrylic acid were added to 100 parts by weight of straight-run asphalt (penetration 70 1 / 10 mm), and the mixture was heated at 140°C and stirred at 1000 r / min for 3 hours to obtain an asphalt composition P5.

[0163] Comparative Example 1

[0164] An asphalt composition was prepared according to the method of Example 5, except that the microcapsules W-E2 and W-E3 in step (4) were replaced by the microcapsules W-E1 of the same weight to obtain asphalt composition D1.

[0165] Comparative Example 2

[0166] An asphalt composition was prepared according to the method of Example 5, except that the microcapsules W-E1 and W-E3 in step (4) were replaced by the microcapsules W-E2 of the same weight to obtain asphalt composition D2.

[0167] Comparative Example 3

[0168] An asphalt composition was prepared according to the method of Example 5, except that the microcapsules W-E1 and W-E2 in step (4) were replaced by the microcapsules W-E3 of the same weight to prepare asphalt composition D3.

[0169] Comparative Example 4

[0170] (Compare this comparative example with Example 1)

[0171] 0.09 parts by weight of 3,4-methylenedioxybenzaldehyde, 0.02 parts by weight of myrcenol, 0.03 parts by weight of ethyl cinnamate, and 0.1 parts by weight of 3-(3,5-dimethyl-4-hydroxyphenyl)acrylic acid were added to 100 parts by weight of straight-run asphalt (penetration 70 1 / 10 mm), and the mixture was heated at 150°C and stirred at 800 r / min for 3 hours to obtain asphalt composition D4.

[0172] Comparative Example 5

[0173] (Compare this comparative example with Example 1)

[0174] (1) 1 part by weight of 3,4-methylenedioxybenzaldehyde was added to 9 parts by weight of water at 60°C, and 0.05 parts by weight of hexadecyltrimethylammonium bromide was added. The mixture was sheared and emulsified at 2000 r / min for 30 minutes to form an oil-in-water emulsion L-A1 in the aqueous phase.

[0175] 1 part by weight of myrcenol was added to 9 parts by weight of water at 60° C., and 0.05 parts by weight of cetyltrimethylammonium bromide was added. The mixture was sheared and emulsified at 2000 r / min for 30 minutes to form an oil-in-water emulsion L-A2 in the aqueous phase.

[0176] 1 part by weight of ethyl cinnamate was added to 9 parts by weight of water at 60°C, and 0.05 parts by weight of hexadecyltrimethylammonium bromide was added. The mixture was emulsified at a shearing speed of 2000 r / min for 30 minutes to form an oil-in-water emulsion L-A3 in the aqueous phase.

[0177] (2) 1 part by weight of melamine, 2 parts by weight of a 37 wt.% formaldehyde solution, and 8 parts by weight of deionized water were fully dissolved in a three-necked flask, and the pH value was adjusted to 8.5. The flask was then placed in a constant temperature water bath at 60° C. and stirred at 800 rpm for 0.5 h to obtain a melamine resin prepolymer.

[0178] Dilute hydrochloric acid was added dropwise to 1 part by weight of the oil-in-water emulsion L-A1 to adjust the pH value to 2. 0.10 parts by weight of the prepared melamine resin prepolymer was slowly added dropwise to the oil-in-water emulsion, stirred at 700 r / min, and reacted at 75°C for 2 hours. After the reaction, the obtained mixed solution was filtered, washed twice with water and ethanol respectively, and placed in an oven to dry at 60°C for 10 hours to obtain the pre-coated material Y-A1.

[0179] Dilute hydrochloric acid was added dropwise to 1 part by weight of the oil-in-water emulsion L-A2 to adjust the pH value to 2. 0.12 parts by weight of the prepared melamine resin prepolymer was slowly added dropwise to the oil-in-water emulsion, stirred at 700 r / min, and reacted at 75°C for 2 hours. After the reaction, the obtained mixed solution was filtered, washed twice with water and ethanol respectively, and placed in an oven to dry at 60°C for 10 hours to obtain the pre-coated material Y-A2.

[0180] Dilute hydrochloric acid was added dropwise to 1 part by weight of the oil-in-water emulsion L-A3 to adjust the pH value to 2. 0.17 parts by weight of the prepared melamine resin prepolymer was slowly added dropwise to the oil-in-water emulsion, stirred at 700 r / min, and reacted at 75°C for 2 hours. After the reaction, the obtained mixed solution was filtered, washed twice with water and ethanol respectively, and placed in an oven at 60°C for 10 hours to obtain the pre-coated material Y-A3.

[0181] (3) 0.2 parts by weight of the prepared pre-coated material Y-A1, 0.05 parts by weight of the pre-coated material Y-A2, 0.1 parts by weight of the pre-coated material Y-A3, and 0.1 parts by weight of 3-(3,5-dimethyl-4-hydroxyphenyl)acrylic acid were added to 100 parts by weight of straight-run asphalt (penetration 70 1 / 10 mm), and the mixture was heated at 150°C and stirred at 800 r / min for 3 hours to obtain an asphalt composition D5.

[0182] Comparative Example 6

[0183] (Compare this comparative example with Example 1)

[0184] (1) 1 part by weight of 3,4-methylenedioxybenzaldehyde was added to 9 parts by weight of water at 60°C, and 0.05 parts by weight of hexadecyltrimethylammonium bromide was added. The mixture was sheared and emulsified at 2000 r / min for 30 minutes to form an oil-in-water emulsion L-A1 in the aqueous phase.

[0185] 1 part by weight of myrcenol was added to 9 parts by weight of water at 60° C., and 0.05 parts by weight of cetyltrimethylammonium bromide was added. The mixture was sheared and emulsified at 2000 r / min for 30 minutes to form an oil-in-water emulsion L-A2 in the aqueous phase.

[0186] 1 part by weight of ethyl cinnamate was added to 9 parts by weight of water at 60°C, and 0.05 parts by weight of hexadecyltrimethylammonium bromide was added. The mixture was emulsified at a shearing speed of 2000 r / min for 30 minutes to form an oil-in-water emulsion L-A3 in the aqueous phase.

[0187] (2) 1 part by weight of melamine, 2 parts by weight of a 37 wt.% formaldehyde solution, and 8 parts by weight of deionized water were fully dissolved in a three-necked flask, and the pH value was adjusted to 8.5. The flask was then placed in a constant temperature water bath at 60° C. and stirred at 800 rpm for 0.5 h to obtain a melamine resin prepolymer.

[0188] Dilute hydrochloric acid was added dropwise to 1 part by weight of the oil-in-water emulsion L-A1 to adjust the pH value to 2. 0.10 parts by weight of the prepared melamine resin prepolymer was slowly added dropwise to the oil-in-water emulsion, stirred at 700 r / min, and reacted at 75°C for 2 hours. After the reaction, the obtained mixed solution was filtered, washed twice with water and ethanol respectively, and placed in an oven to dry at 60°C for 10 hours to obtain the pre-coated material Y-A1.

[0189] Dilute hydrochloric acid was added dropwise to 1 part by weight of the oil-in-water emulsion L-A2 to adjust the pH value to 2. 0.12 parts by weight of the prepared melamine resin prepolymer was slowly added dropwise to the oil-in-water emulsion, stirred at 700 r / min, and reacted at 75°C for 2 hours. After the reaction, the obtained mixed solution was filtered, washed twice with water and ethanol respectively, and placed in an oven to dry at 60°C for 10 hours to obtain the pre-coated material Y-A2.

[0190] Dilute hydrochloric acid was added dropwise to 1 part by weight of the oil-in-water emulsion L-A3 to adjust the pH value to 2. 0.17 parts by weight of the prepared melamine resin prepolymer was slowly added dropwise to the oil-in-water emulsion, stirred at 700 r / min, and reacted at 75°C for 2 hours. After the reaction, the obtained mixed solution was filtered, washed twice with water and ethanol respectively, and placed in an oven at 60°C for 10 hours to obtain the pre-coated material Y-A3.

[0191] (3) 0.1 parts by weight of chlorinated rubber, 1.00 parts by weight of the pre-coating material Y-A1 and 5 parts by weight of water were mixed and stirred at 500 r / min to obtain microcapsules W-F1, wherein the chlorinated rubber in the microcapsules was not wrapped in the outermost layer of the microcapsules in the form of a membrane, the size of which was 4-6 μm, the elastic modulus was 0.8 GPa, and the thickness of the capsule wall was 2.3 μm, which did not conform to the calculation formula Y = 0.42X 2 -0.92X+T.

[0192] 0.1 parts by weight of chlorinated rubber, 0.55 parts by weight of the pre-coating material Y-A2 and 5 parts by weight of water were mixed and stirred at 500 r / min to obtain microcapsules W-F2, wherein the chlorinated rubber in the microcapsules was not wrapped in the outermost layer of the microcapsules in the form of a membrane, the size of which was 6-8 μm, the elastic modulus was 1.9 GPa, and the thickness of the capsule wall was 3.4 μm, which did not conform to the calculation formula Y=0.42X 2 -0.92X+T.

[0193] 0.1 parts by weight of chlorinated rubber, 0.43 parts by weight of the pre-coating material Y-A3 and 5 parts by weight of water were mixed and stirred at 500 r / min to obtain microcapsules W-F3, wherein the chlorinated rubber in the microcapsules was not wrapped in the outermost layer of the microcapsules in the form of a membrane, the size of which was 8-10 μm, the elastic modulus was 2.5 GPa, and the thickness of the capsule wall was 4.0 μm, which did not meet the calculation formula Y=0.42X 2 -0.92X+T.

[0194] (4) 0.2 parts by weight of the prepared microcapsules W-F1, 0.05 parts by weight of the microcapsules W-F2, 0.1 parts by weight of the microcapsules W-F3, and 0.1 parts by weight of 3-(3,5-dimethyl-4-hydroxyphenyl)acrylic acid were added to 100 parts by weight of straight-run asphalt (penetration 70 1 / 10 mm), and the mixture was heated at 150°C and stirred at 800 r / min for 3 hours to obtain an asphalt composition D6.

[0195] Comparative Example 7

[0196] (Compare this comparative example with Example 1)

[0197] Microcapsules were prepared according to the method of Example 1, except that in step (1), the amount of water was increased to 15 parts by weight, and the amount of chlorinated rubber was increased to 0.50 parts by weight.

[0198] The microcapsule W-G1 was obtained, with a size of 4-6 μm, an elastic modulus of 1.0 GPa, and a capsule wall thickness of 1.7 μm, which did not conform to the calculation formula Y = 0.42X 2 -0.92X+T.

[0199] The microcapsules W-G2 were obtained, with a size of 6-8 μm, an elastic modulus of 2.3 GPa, and a capsule wall thickness of 2.7 μm, which did not conform to the calculation formula Y = 0.42X 2 -0.92X+T.

[0200] The microcapsules W-G3 were obtained, with a size of 8-10 μm, an elastic modulus of 3.7 GPa, and a capsule wall thickness of 3.6 μm, which did not conform to the calculation formula Y = 0.42X 2 -0.92X+T.

[0201] (4) 0.2 parts by weight of the prepared microcapsules W-G1, 0.05 parts by weight of the microcapsules W-G2, 0.1 parts by weight of the microcapsules W-G3, and 0.1 parts by weight of 3-(3,5-dimethyl-4-hydroxyphenyl)acrylic acid were added to 100 parts by weight of straight-run asphalt (penetration 70 1 / 10 mm), and the mixture was heated at 150°C and stirred at 800 r / min for 3 hours to obtain an asphalt composition D7.

[0202] Test Example 1

[0203] Asphalt flue gas tests were performed using straight-run asphalt (penetration 70 1 / 10mm), natural asphalt (penetration 50 1 / 10mm), and SBS modified asphalt (penetration 60 1 / 10mm) as asphalt matrices and the asphalt compositions prepared in the above embodiments and comparative examples. Specifically, the asphalt flue gas was enriched by heating at 163°C for 6 hours, and the asphalt flue gas was tested and analyzed using a gas chromatograph and a total hydrocarbon analyzer.

[0204] Table 1: Asphalt smoke test results

[0205] It can be seen from the results in Table 1 that the asphalt additive and asphalt composition according to the present invention, by combining three microcapsules with different sustained-release rates, can achieve the release of different active components at different sustained-release rates, thereby effectively reducing the emission of asphalt fume and reducing pollution to the environment.

[0206] The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited thereto. Within the technical concept of the present invention, various simple variations of the technical solution of the present invention may be made, including combining the various technical features in any other appropriate manner. These simple variations and combinations should also be regarded as disclosed in the present invention and fall within the scope of protection of the present invention.

Claims

1. An asphalt additive, characterized in that: The asphalt additive contains a first microcapsule, a second microcapsule and a third microcapsule, wherein the first microcapsule, the second microcapsule and the third microcapsule each include a capsule core and a capsule wall, the capsule core is wrapped in the capsule wall, the capsule core contains active components, the capsule wall thickness of the first microcapsule is 0.5-2μm, the capsule wall thickness of the second microcapsule is greater than 2μm and less than or equal to 3μm, and the capsule wall thickness of the third microcapsule is greater than 3μm and less than or equal to 5μm.

2. The asphalt additive according to claim 1, characterized in that: The mass ratio of the first microcapsule, the second microcapsule and the third microcapsule is 1:(0.25-4):(0.25-4).

3. The asphalt additive according to claim 1 or 2, characterized in that: In the first microcapsule, the second microcapsule and the third microcapsule, the capsule wall comprises an inner wall layer and an outer wall layer, the inner wall layer is a resin, and the outer wall layer is a rubber material; Preferably, the mass ratio of the inner wall layer to the outer wall layer is 2.4-5:

1.

4. The asphalt additive according to claim 3, characterized in that: The resin is at least one of melamine resin, urea-formaldehyde resin and polymethyl methacrylate, preferably melamine resin.

5. The asphalt composition according to claim 3, characterized in that The rubber material is at least one of chlorinated rubber, styrene-butadiene rubber and chloroprene rubber.

6. The asphalt additive according to any one of claims 1 to 5, characterized in that: In the first microcapsule, the second microcapsule and the third microcapsule, the elastic modulus of the microcapsule and the thickness of the capsule wall satisfy the following formula: Y=0.42X 2 -0.92X+T Wherein, Y is the elastic modulus of the microcapsule, in GPa; X is the thickness of the capsule wall, in μm; T is 1±0.1; The elastic modulus of the microcapsule is obtained by testing the mechanical properties of the microcapsule using a nanoindenter, and the thickness of the capsule wall is obtained by testing the frozen sections of the microcapsule using a scanning electron microscope.

7. The asphalt additive according to any one of claims 1 to 6, characterized in that: In the first microcapsule, the mass ratio of the capsule core to the capsule wall is 1:0.9-1.5; in the second microcapsule, the mass ratio of the capsule core to the capsule wall is 1:1.5-2.2; in the third microcapsule, the mass ratio of the capsule core to the capsule wall is 1:2.2-3.

8. The asphalt additive according to any one of claims 1 to 7, characterized in that: The active component is an inhibitor for inhibiting the release of asphalt smoke, preferably at least one of aldehyde compounds, ketone compounds, alcohol compounds, phenol compounds and ester compounds; Preferably, the aldehyde compound is selected from aliphatic aldehydes having carbon atoms greater than or equal to 7 and aromatic aldehydes having carbon atoms greater than or equal to 6, more preferably at least one of p-tolualdehyde, decanal, o-carboxybenzaldehyde, p-isopropylbenzaldehyde, cinnamaldehyde, p-hydroxybenzaldehyde, p-methoxybenzaldehyde, 2-methyl-3-(3,4-methylene-dioxyphenyl)propanal, 3,4-methylenedioxybenzaldehyde, 3-(4-isopropylphenyl)-2-methylpropanal, ethyl vanillin, phenylacetaldehyde, anisaldehyde, nonadiene-2,6-aldehyde, 2,6-dimethyl-2,6-octadienal, vanillin, citronellal, neral, hydroxymethylpentylcyclohexene acetal, p-diethylaminobenzaldehyde and undecenal; Preferably, the ketone compound is selected from aliphatic ketones having carbon atoms greater than or equal to 8 and aromatic ketones having carbon atoms greater than or equal to 8, more preferably at least one of 6-methyl-3,5-heptadien-2-one, 2-undecanone, acetophenone, ionone, irone, methylionone, damascenone and dihydrodamascenone; Preferably, the alcohol compound is an alcohol having more than 6 carbon atoms, more preferably at least one of cinnamyl alcohol, menthol, cis-3,7-dimethyl-2,6-octadienol, citronellol, geraniol, myrcenol, 2,6,10-trimethyl-2,6,10-dodecatrien-12-ol, lavandulol, benzylenol, 2-phenylethanol, dihydromyrcenol, tetrahydrogeraniol and nerolidol; Preferably, the phenolic compound is a phenol having 6 or more carbon atoms, more preferably at least one of thymol, ethyl maltol, methyl maltol, 3-propenyl-6-ethoxyphenol and isoeugenol; Preferably, the ester compound is an ester having a carbon number greater than 7, more preferably at least one of methyl salicylate, methyl cinnamate, ethyl cinnamate, ethyl phenylacetate, methyl phenylacetate, geranyl phenylacetate, phenylethyl phenylacetate, isoamyl phenylacetate, benzyl salicylate, p-methylbenzyl acetate, benzyl acetate, isobutyl benzoate, isoamyl salicylate, benzyl cinnamate, phenylethyl cinnamate, linalyl formate, linalyl acetate, linalyl isobutyrate, menthyl acetate, pine acetate and bornyl acetate.

9. The asphalt additive according to claim 8, characterized in that: The active components in the first microcapsule are selected from aldehyde compounds and ketone compounds, the active components in the second microcapsule are selected from alcohol compounds and phenol compounds, and the active components in the third microcapsule are selected from ester compounds.

10. An asphalt composition, characterized in that: The asphalt composition contains asphalt and the asphalt additive according to any one of claims 1-9.

11. The asphalt composition according to claim 10, characterized in that Relative to 100 parts by weight of the asphalt, the content of the asphalt additive is 0.1-2 parts by weight, preferably 0.15-0.6 parts by weight.

12. The asphalt composition according to claim 10 or 11, characterized in that: The asphalt composition further contains an antioxidant, and the content of the antioxidant is 0.01-0.1 parts by weight relative to 100 parts by weight of the asphalt.

13. The asphalt composition according to claim 12, characterized in that The antioxidant is bis(3,5-tri-tert-butyl-4-hydroxyphenyl) sulfide, p-tert-butyl catechol, 3,5-di-tert-butyl-4-hydroxybenzyl diethylphosphonate, β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate, β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate, 4,4'-thiobis(6-tert-butyl-3-methylphenol), pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate, 1,3,5-trimethylolpropionate, At least one of 2,4,6-tris(3,5-di-tert-butyl-4-hydroxybenzyl)benzene, 2,6-di-tert-butyl-p-methylphenol, 3,5-di-tert-butyl-4-hydroxybenzoic acid, 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid, 3-(3,5-di-tert-butyl-4-hydroxyphenyl)acrylic acid, 3-(3,5-dimethyl-4-hydroxyphenyl)acrylic acid, 3-(3,5-dimethoxy-4-hydroxyphenyl)acrylic acid and 3-(3-methoxy-4-hydroxyphenyl)acrylic acid.

14. The asphalt composition according to any one of claims 10 to 13, characterized in that: The asphalt is at least one of straight-run asphalt, polymer-modified asphalt and natural asphalt; Preferably, the needle penetration of the asphalt is 30-210 1 / 10mm.

15. A method for preparing the asphalt composition according to any one of claims 10 to 14, characterized in that: The method includes: (1) The first microcapsule, the second microcapsule and the third microcapsule are prepared respectively, and the preparation process is as follows: S1, mixing the active ingredient, emulsifier and water to form an oil-in-water emulsion; S2, reacting the oil-in-water emulsion with a resin prepolymer, and then filtering, washing, and drying to obtain a pre-coated material; S3, in the presence of a volatile solvent, mixing the rubber material with the pre-coated material, then mixing the obtained mixture with water, and heating until the volatile solvent evaporates to obtain microcapsules; (2) Mixing molten asphalt, the first microcapsules, the second microcapsules, the third microcapsules and an optional antioxidant.

16. The method according to claim 15, characterized in that In step S1, the mass ratio of the active component, the emulsifier and water is 1:(0.05-0.09):(6-9).

17. The method according to claim 15, characterized in that In step S2, before the oil-in-water emulsion reacts with the resin prepolymer, the pH value of the oil-in-water emulsion is adjusted to below 5, preferably 2-4.

18. The method according to claim 15 or 17, characterized in that In step S2, the resin prepolymer is a melamine resin prepolymer; Preferably, the preparation method of the melamine resin prepolymer comprises: mixing and dissolving melamine and formaldehyde solution with water, adjusting the pH value to 7.5-9.5, and then placing in a constant temperature water bath at 60-90° C., and reacting for 0.5-3.5 hours under stirring; Preferably, the concentration of the formaldehyde solution is 30-40wt.%; Preferably, the mass ratio of the melamine, the formaldehyde solution and the water is 1:(2-3):(8-10).

19. The method according to claim 15, characterized in that In step S3, the mass ratio of the rubber material, the volatile solvent and water is 1:(10-20):(50-150).

20. The method according to any one of claims 15 to 19, characterized in that: The emulsifier is selected from at least one of sodium stearate, sodium dodecyl sulfate, sodium dodecylbenzene sulfonate, hexadecyltrimethylammonium chloride, hexadecyltrimethylammonium bromide, hexadecyldimethylhydroxyethylammonium chloride, nonylphenol polyoxyethylene ether, octylphenol polyoxyethylene ether and hexadecane polyoxyethylene ether.

21. The method according to any one of claims 15 to 20, characterized in that: The volatile solvent is selected from at least one of carbon tetrachloride, dichloromethane and trichloroethylene.

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