An asphalt additive and asphalt composition and a method for preparing the same

Abstract

The application discloses an asphalt additive and an asphalt composition and a preparation method thereof. The asphalt additive contains first microcapsules, second microcapsules and third microcapsules, wherein the first microcapsules, the second microcapsules and the third microcapsules 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 microcapsules is 0.5-2 microns, the capsule wall thickness of the second microcapsules is greater than 2 microns and less than or equal to 3 microns, and the capsule wall thickness of the third microcapsules is greater than 3 microns and less than or equal to 5 microns. The asphalt composition of the application has a long storage and service life, can effectively reduce the emission of asphalt fume during the construction process, and reduces the pollution to the environment.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of road asphalt, and particularly relates to an asphalt additive and an asphalt composition and a preparation method thereof, and more particularly relates to a clean asphalt additive and a clean asphalt composition and a preparation method thereof. BACKGROUND

[0002] Asphalt pavement is the main type of highway, and the traditional hot mixing and hot paving process is still used in the pavement construction link. During the construction process, asphalt will contact with oxygen in the air and react: on the one hand, condensation reaction occurs to generate large molecular weight condensed ring aromatics, which are further condensed into colloid and asphaltene; on the other hand, the asphalt molecules will crack under the condition of heat to generate smaller molecular weight compounds, and these small molecular compounds volatilized will form asphalt fume, which seriously destroys the ecological balance, pollutes the surrounding environment and damages human health.

[0003] In view of the unorganized release of volatile organic compounds (VOCs) during the paving process of asphalt pavement, it is difficult to collect and manage the whole process, and it is an urgent problem to be solved to explore how to reduce the release of asphalt fume at the source, realize clean construction of asphalt pavement and ensure the harmonious development of the transportation industry and social economy.

[0004] Chinese patent application CN101842426A reduces the odor of asphalt by adding active agents and diluents, but the active agents have poor reactivity and limited action time, and cannot play a long-term role.

[0005] Chinese patent application CN109749466A reduces the emission of asphalt fume by using metal organic framework compounds, inorganic adsorbent materials, reaction-type odor inhibitors, free radical scavengers and the like, but the inorganic adsorbent materials and the like have poor compatibility with asphalt, which affects the performance of asphalt, and there is also the problem of short action time of active components.

[0006] Chinese patent application CN103242496A discloses a room temperature self-repairing thermoplastic polymer material based on multi-layer microcapsules and a preparation method thereof, and the fourth layer of the multi-layer microcapsules has a capsule wall of paraffin or chlorinated paraffin, which is dissolved in asphalt, and the third layer of the capsule wall has poor compatibility with asphalt, which affects the performance of asphalt, so that the material can be used for repairing thermoplastic polymer materials, but is not suitable for asphalt materials.

[0007] In summary, the existing technology simply adds inorganic fillers or active components to asphalt, which causes the problems of segregation and stratification of inorganic fillers and asphalt, and the problem of limited action time of active components, which cannot play a long-term role. SUMMARY

[0008] The present application aims to overcome the problem of asphalt pavement emitting asphalt fume (containing volatile organic compounds) and polluting the environment, and provides an asphalt additive, an asphalt composition and a preparation method thereof. The asphalt composition using the asphalt additive has a long storage and service life, and can effectively reduce the emission of asphalt fume and the pollution to the environment during construction.

[0009] To achieve the above-mentioned object, the present application provides an asphalt additive containing first microcapsules, second microcapsules and third microcapsules, wherein the first microcapsules, the second microcapsules and the third microcapsules 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 microcapsules is 0.5-2 μm, the capsule wall thickness of the second microcapsules is greater than 2 μm and less than or equal to 3 μm, and the capsule wall thickness of the third microcapsules is greater than 3 μm and less than or equal to 5 μm.

[0010] Preferably, the mass ratio of the first microcapsules, the second microcapsules and the third microcapsules is 1:(0.25-4):(0.25-4).

[0011] Preferably, in the first microcapsules, the second microcapsules and the third microcapsules, 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.

[0012] Preferably, the mass ratio of the inner wall layer to the outer wall layer is 2.4-5:1.

[0013] Preferably, the resin is at least one of melamine resin, urea-formaldehyde resin and polymethyl methacrylate, and preferably is melamine resin.

[0014] Preferably, the rubber material is at least one of chlorinated rubber, styrene-butadiene rubber and chloroprene rubber.

[0015] Preferably, in the first microcapsules, the second microcapsules and the third microcapsules, the elastic modulus of the microcapsules and the thickness of the capsule wall satisfy the following formula:

[0016] Y=0.42X 2 -0.92X+T

[0017] wherein Y is the elastic modulus of the microcapsules, in GPa; X is the thickness of the capsule wall, in μm; and T is 1±0.1.

[0018] The elastic modulus of the microcapsules is obtained by mechanical property testing of the microcapsules using a nanoindenter, and the thickness of the capsule wall is obtained by testing the frozen section of the microcapsules using a scanning electron microscope.

[0019] Preferably, in the first microcapsule, the mass ratio of the core and the wall is 1:0.9-1.5; in the second microcapsule, the mass ratio of the core and the wall is 1:1.5-2.2; in the third microcapsule, the mass ratio of the core and the wall is 1:2.2-3.

[0020] 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, phenolic compounds and ester compounds.

[0021] Preferably, the aldehyde compound is selected from at least one of aliphatic aldehydes with carbon atom number greater than or equal to 7 and aromatic aldehydes with carbon atom number greater than or equal to 6, more preferably at least one of p-methylbenzaldehyde, decanal, o-carboxybenzaldehyde, p-isopropylbenzaldehyde, cinnamyl aldehyde, p-hydroxybenzaldehyde, p-methoxybenzaldehyde, 2-methyl-3-(3,4-methylene-dioxyphenyl)propanal, 3,4-methylenedioxybenzaldehyde, 3-(4-isopropylphenyl)-2-methylpropanal, ethyl vanillin, phenylacetaldehyde, anisic aldehyde, nonadiene-2,6-aldehyde, 2,6-dimethyl-2,6-octadienal, vanillin, citronellal, nerol, hydroxymethyl pentyl cyclohexene acetal, p-diethylaminobenzaldehyde and undecenal.

[0022] Preferably, the ketone compound is selected from at least one of aliphatic ketones with carbon atom number greater than or equal to 8 and aromatic ketones with carbon atom number greater than or equal to 8, more preferably at least one of 6-methyl-3,5-heptadien-2-one, 2-undecanone, acetophenone, ionone, methylionone, damascone and dihydrodamascone.

[0023] Preferably, the alcohol compound is an alcohol with carbon atom greater than 6, more preferably at least one of cinnamic 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.

[0024] Preferably, the phenolic compound is a phenol with carbon atom greater than or equal to 6, more preferably at least one of thymol, ethyl maltol, methyl maltol, 3-propenyl-6-ethoxyphenol and isoeugenol.

[0025] Preferably, the ester compound is at least one of methyl salicylate, methyl cinnamate, ethyl cinnamate, ethyl phenylacetate, methyl phenylacetate, geranyl phenylacetate, phenethyl phenylacetate, isoamyl phenylacetate, benzyl salicylate, p-methylbenzyl acetate, benzyl acetate, isobutyl benzoate, isoamyl salicylate, benzyl laurate, phenethyl laurate, linalyl formate, linalyl acetate, linalyl isobutyrate, menthyl acetate, terpinyl acetate, and bornyl acetate.

[0026] Preferably, the active component in the first microcapsule is selected from aldehydes and ketones, the active component in the second microcapsule is selected from alcohols and phenols, and the active component in the third microcapsule is selected from esters.

[0027] The second aspect of the present application provides a bitumen composition containing bitumen and the bitumen additive described above.

[0028] Preferably, the content of the bitumen additive is 0.1-2 parts by weight, preferably 0.15-0.6 parts by weight, relative to 100 parts by weight of the bitumen.

[0029] Preferably, the bitumen 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 bitumen.

[0030] Preferably, the antioxidant is at least one of bis(3,5-tri-tert-butyl-4-hydroxyphenyl) sulfide, p-tert-butylcatechol, 3,5-di-tert-butyl-4-hydroxybenzyl diethylphosphonate, n-octadecyl β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, isooctanol 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-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.

[0031] Preferably, the bitumen is at least one of straight-run bitumen, polymer modified bitumen, and natural bitumen.

[0032] Preferably, the bitumen has a penetration of 30-210 1 / 10 mm.

[0033] The third aspect of the present application provides a method for preparing the asphalt composition described above, which comprises:

[0034] (1) separately preparing a first microcapsule, a second microcapsule and a third microcapsule, the preparation process being:

[0035] S1, mixing an active component, an emulsifier and water to form an oil-in-water emulsion;

[0036] S2, reacting the oil-in-water emulsion with a resin prepolymer, then filtering, washing and drying to obtain a pre-coated material;

[0037] S3, mixing a rubber material with the pre-coated material in the presence of a volatile solvent, then mixing the obtained mixture with water, and heating to volatilize the volatile solvent to obtain a microcapsule;

[0038] (2) mixing molten asphalt, the first microcapsule, the second microcapsule, the third microcapsule and optionally an antioxidant.

[0039] Preferably, in step S1, the mass ratio of the use amount of the active component, the emulsifier and water is 1:(0.05-0.09):(6-9).

[0040] Preferably, in step S2, the pH value of the oil-in-water emulsion is adjusted to below 5, preferably 2-4, before the oil-in-water emulsion is reacted with the resin prepolymer.

[0041] Preferably, in step S2, the resin prepolymer is a melamine resin prepolymer.

[0042] Preferably, the preparation method of the melamine resin prepolymer comprises: mixing and dissolving a 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 0.5-3.5h under stirring.

[0043] Preferably, the concentration of the formaldehyde solution is 30-40wt.%.

[0044] Preferably, the mass ratio of the use amount of the melamine, the formaldehyde solution and water is 1:(2-3):(8-10).

[0045] Preferably, in step S3, the mass ratio of the use amount of the rubber material, the volatile solvent and water is 1:(10-20):(50-150).

[0046] Preferably, the emulsifier is selected from at least one of sodium naphthenate, sodium dodecyl sulfate, sodium dodecyl benzene sulfonate, cetyl trimethyl ammonium chloride, cetyl trimethyl ammonium bromide, cetyl dimethyl hydroxyethyl ammonium chloride, nonylphenol polyoxyethylene ether, octylphenol polyoxyethylene ether, and cetyl polyoxyethylene ether.

[0047] Preferably, the volatile solvent is selected from at least one of carbon tetrachloride, dichloromethane, and trichloroethylene.

[0048] In the asphalt additive described in the present application, by using three kinds of microcapsules with different slow-release speeds, different active components can be released at different slow-release speeds, and the action time of the active components can be prolonged. When the asphalt additive is used in an asphalt composition, the asphalt composition has a longer storage and service life, and the emission of asphalt fumes can be effectively reduced during construction, thereby reducing environmental pollution.

[0049] In a more preferred embodiment, the active component in the core of the microcapsule is selected to be an inhibitor for inhibiting the release of asphalt fumes, and 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. As the rubber material of the outer wall layer, a layer of uniform and dense film material is wrapped outside the inner wall layer, so that the whole microcapsule can not only ensure a certain strength, but also ensure effective integration with asphalt and good compatibility. DETAILED DESCRIPTION

[0050] The specific embodiments of the present application are described in detail below. It should be understood that the specific embodiments described herein are merely intended to illustrate and explain the present application, and are not intended to limit the present application.

[0051] The endpoints of the ranges and any values disclosed herein are not limited to the precise values stated. The endpoints of the ranges and the values are approximate values and are understood to be encompassed within the range. For ranges with endpoints, the endpoints are included within the range. For ranges without endpoints, the range extends to include the endpoints. The endpoints of the ranges and the values are not limited to the precise values stated. The endpoints of the ranges and the values are approximate values and are understood to be encompassed within the range.

[0052] The asphalt additive described in the present application contains first microcapsules, second microcapsules, and third microcapsules, wherein the first microcapsules, the second microcapsules, and the third microcapsules each comprise a core and a wall, the core is wrapped in the wall, the core contains an active component, the wall thickness of the first microcapsules is 0.5-2 μm, the wall thickness of the second microcapsules is greater than 2 μm and less than or equal to 3 μm, and the wall thickness of the third microcapsules is greater than 3 μm and less than or equal to 5 μm.

[0053] 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:

[0054] Y = 0.42X 2 -0.92X + T

[0055] wherein Y is the elastic modulus of the microcapsule, in GPa; X is the thickness of the capsule wall, in μm; and T is 1 ± 0.1.

[0056] The elastic modulus of the microcapsule is obtained by mechanical property test of the microcapsule using a nanoindenter, and the thickness of the capsule wall is obtained by test of frozen section of the microcapsule using a scanning electron microscope.

[0057] In the asphalt additive, 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; and in the third microcapsule, the mass ratio of the capsule core to the capsule wall is 1:2.2-3.

[0058] In the microcapsule, the thickness of the capsule wall can be 0.5-5 μm, and specifically, for example, it can be 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, 2.5 μm, 2.6 μm, 2.7 μm, 2.8 μm, 2.9 μm, 3 μm, 3.1 μm, 3.2 μm, 3.3 μm, 3.4 μm, 3.5 μm, 3.6 μm, 3.7 μm, 3.8 μm, 3.9 μm, 4 μm, 4.1 μm, 4.2 μm, 4.3 μm, 4.4 μm, 4.5 μm, 4.6 μm, 4.7 μm, 4.8 μm, 4.9 μm or 5 μm.

[0059] In the microcapsule, the size of the microcapsule can be 50 μm or less, preferably 20 μm or less, and more preferably 3-15 μm.

[0060] In the microcapsule, in a preferred case, 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. In this preferred case, on the one hand, the microcapsule has a certain strength, meeting the road surface use requirement; on the other hand, the rubber material as the outer wall layer can effectively fuse with asphalt, and the rubber material has good adhesion, forming a strong combination with the resin (especially melamine resin) as the inner wall layer.

[0061] Further preferably, the mass ratio of the inner wall layer to the outer wall layer is 2.4-5:1, and specifically, for example, 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.

[0062] When the capsule wall of the microcapsule comprises 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); and 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).

[0063] In the present application, the content of the capsule core of the microcapsule, the content of the capsule wall, and the mass of the inner layer and the outer layer of the capsule wall are detected by the following method: the microcapsule is added into a volatile solvent (the volatile solvent can be selected from one or more of carbon tetrachloride, dichloromethane, and trichloroethylene), dissolved and filtered, and then the first solid powder obtained is sufficiently dried, and the difference between the mass of the first solid powder and the initial microcapsule is the mass of the outer layer of the capsule wall; the first solid powder obtained is further ground, added into toluene, dissolved and filtered, and then the second solid powder obtained is sufficiently dried, and the difference between the mass of the second solid powder and the first solid powder is the mass of the capsule core; and the mass of the inner layer of the capsule wall is the mass of the microcapsule minus the mass of the outer layer of the capsule wall and the mass of the capsule core.

[0064] In the microcapsule, the resin can be at least one of melamine resin, urea-formaldehyde resin, and polymethyl methacrylate, and most preferably is melamine resin.

[0065] In the microcapsule, the rubber material can be at least one of chlorinated rubber, styrene-butadiene rubber, and neoprene.

[0066] In the microcapsule, the active component is preferably an inhibitor for inhibiting the release of asphalt fume. When the active component in the microcapsule is an inhibitor for inhibiting the release of asphalt fume, the structure of the microcapsule can prolong the action time of the active component, so that the asphalt composition has a longer storage and service life, and can effectively reduce the emission of asphalt fume and the pollution to the environment during asphalt construction.

[0067] In the present application, the inhibitor for suppressing release of asphalt fume is preferably at least one of an aldehyde compound, a ketone compound, an alcohol compound, a phenol compound, and an ester compound.

[0068] In the present application, the aldehyde compound can be at least one of a fatty aldehyde having a carbon number of 7 or more and an aromatic aldehyde having a carbon number of 6 or more. In a preferred case, the aldehyde compound is at least one of a C7-C13 fatty aldehyde and a C6-C13 aromatic aldehyde. Specifically, the aldehyde compound is at least one selected from the group consisting of p-methylbenzaldehyde, decanal, o-carboxybenzaldehyde, p-isopropylbenzaldehyde, cinnamyl aldehyde, p-hydroxybenzaldehyde, p-methoxybenzaldehyde, 2-methyl-3-(3,4-methylene-dioxyphenyl)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, hydroxymethylamylcyclohexene acetal, p-diethylaminobenzaldehyde, and undecenal.

[0069] In the present application, the ketone compound can be at least one of a fatty ketone having a carbon number of 8 or more and an aromatic ketone having a carbon number of 8 or more. In a preferred case, the ketone compound is at least one of a C8-C11 fatty ketone and a C8-C14 aromatic ketone. Specifically, the ketone compound is at least one selected from the group consisting of 6-methyl-3,5-heptadien-2-one, 2-undecanone, acetophenone, ionone, irone, methylionone, damascone, and dihydrodamascone.

[0070] In the present application, the alcohol compound is an alcohol having a carbon number of more than 6, and is preferably a C7-C15 alcohol. Specifically, the alcohol compound is at least one selected from the group consisting of cinnamic 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, tetrahydrolinalool, and nerolidol.

[0071] In the present application, the phenol compound is a phenol having a carbon number of 6 or more, and is preferably a C6-C15 phenol. Specifically, the phenol compound is at least one selected from the group consisting of thymol, ethyl maltol, methyl maltol, 3-propenyl-6-ethoxyphenol, and isoeugenol.

[0072] In the present application, the ester compound is an ester having a carbon atom number greater than 7, 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, phenethyl phenylacetate, isoamyl phenylacetate, benzyl salicylate, p-methylbenzyl acetate, benzyl acetate, isobutyl benzoate, isoamyl salicylate, benzyl laurate, phenethyl laurate, linalyl formate, linalyl acetate, linalyl isobutyrate, menthyl acetate, terpinyl acetate, and bornyl acetate.

[0073] In the asphalt additive of the present application, in a preferred case, 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. The active components in the various microcapsules are thus configured to be released at different release rates, which has a significantly better effect on inhibiting the emission of asphalt fumes.

[0074] In the asphalt additive of the present application, in a preferred case, the mass ratio of the first microcapsule, the second microcapsule, and the third microcapsule is 1:(0.25-4):(0.25-4).

[0075] The asphalt composition of the present application contains asphalt and the asphalt additive described above. In the asphalt composition of the present application, the addition of the asphalt additive enables a longer storage and service life, and effectively reduces the emission of asphalt fumes and the pollution to the environment during construction.

[0076] In the asphalt composition of the present application, the content of the microcapsule can be 0.1-2 parts by weight, preferably 0.15-0.6 parts by weight, relative to 100 parts by weight of the asphalt.

[0077] In the present application, the asphalt composition can further contain an antioxidant. The content of the antioxidant can be a conventional selection in the art. Specifically, the content of the antioxidant can 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.

[0078] In the asphalt composition of the present application, the asphalt can be at least one of straight-run asphalt, polymer modified asphalt, and natural asphalt. Preferably, the asphalt has a penetration of 30-210 1 / 10 mm.

[0079] In the asphalt composition described in the present application, the antioxidant can be a conventional selection in the art. Preferably, the antioxidant is at least one of bis(3,5-tri-tert-butyl-4-hydroxyphenyl) sulfide, p-tert-butylcatechol, 3,5-di-tert-butyl-4-hydroxybenzyl diethylphosphonate, n-octadecanol β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, isooctanol β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, 4,4'-thiobis(6-tert-butyl-3-methylphenol), tetra[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid] pentaerythritol ester, 1,3,5-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.

[0080] The preparation method of the asphalt composition described above can include:

[0081] (1) separately preparing a first microcapsule, a second microcapsule, and a third microcapsule, the preparation process being:

[0082] S1, mixing an active component, an emulsifier, and water to form an oil-in-water emulsion;

[0083] S2, reacting the oil-in-water emulsion with a resin prepolymer, and then filtering, washing, and drying to obtain a pre-coated material;

[0084] S3, mixing a rubber material with the pre-coated material in the presence of a volatile solvent, and then mixing the obtained mixture with water, and heating to volatilize the volatile solvent to obtain a microcapsule;

[0085] (2) mixing molten asphalt, the first microcapsule, the second microcapsule, the third microcapsule, and optionally an antioxidant.

[0086] In step S1, the mixing process can be carried out in a shearing machine, and the operating conditions can include a rotation speed of 2000-4000 r / min and a time of 20-30 min.

[0087] In step S1, the mass ratio of the amount of the active component, the emulsifier, and water can be 1:(0.05-0.09):(6-9).

[0088] In some embodiments, the operation process of step S1 is: dissolving the active component in water, then adding the emulsifier, and then performing high-speed shearing emulsification at a rotation speed of 2000-4000 r / min.

[0089] In step S2, the pH value of the oil-in-water emulsion is adjusted to below 5, preferably 2-4, before the oil-in-water emulsion is reacted with the resin prepolymer. The reagent used to adjust the pH value can be a conventional inorganic acid solution, such as dilute hydrochloric acid.

[0090] In step S2, the reaction of the oil-in-water emulsion with the resin prepolymer is performed under stirring, the stirring speed can be 400-800 r / min, the reaction temperature can be 60-90℃, and the time can be 1-5 h.

[0091] In step S2, the filtration process can be suction filtration.

[0092] In step S2, the washing process can include washing with water and ethanol for two or more times, respectively.

[0093] In step S2, the drying process can be performed in an oven, the drying temperature can be 60-90℃, and the time can be 5-10 h.

[0094] In step S2, the resin prepolymer can be one or more of melamine resin prepolymer, urea-formaldehyde resin prepolymer, and polymethyl methacrylate prepolymer. In a preferred case, the resin prepolymer is melamine resin prepolymer. The preparation method of the melamine resin prepolymer can include: 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℃, and reacting under stirring for 0.5-3.5 h. In the preparation process of the melamine resin prepolymer, the concentration of the formaldehyde solution can be 30-40 wt.%. The mass ratio of the use amounts of the melamine, the formaldehyde solution, and water can be 1:(2-3):(8-10).

[0095] In step S3, the mass ratio of the use amounts of the rubber material, the volatile solvent, and water can be 1:(10-20):(50-150).

[0096] In the method described in the present application, the active component can be selected from one or at least two or more arbitrary combinations of aldehyde compounds, ketone compounds, alcohol compounds, phenolic compounds, and ester compounds. Specifically, the aldehyde compounds, the ketone compounds, the alcohol compounds, the phenolic compounds, and the ester compounds are selected from the same as described above.

[0097] In the method of the present application, the rubber material can be at least one of chlorinated rubber, styrene butadiene rubber, and neoprene.

[0098] In the method of the present application, the emulsifier can be at least one of sodium naphthenate, sodium dodecyl sulfate, sodium dodecyl benzene sulfonate, cetyl trimethyl ammonium chloride, cetyl trimethyl ammonium bromide, cetyl dimethyl hydroxyethyl ammonium chloride, nonylphenol polyoxyethylene ether, octylphenol polyoxyethylene ether, and hexadecyl polyoxyethylene ether.

[0099] In the method of the present application, the volatile solvent can be at least one of carbon tetrachloride, dichloromethane, and trichloroethylene.

[0100] The asphalt additive and asphalt composition of the present application and the method for preparing the same are further illustrated by the following examples. The examples are implemented on the premise of the technical solutions of the present application, and detailed implementation modes and specific operation processes are given, but the protection scope of the present application is not limited to the following examples.

[0101] In the following examples, the experimental methods are all conventional methods in the art unless otherwise specified. The experimental materials used in the following examples are all commercially available unless otherwise specified.

[0102] Example 1

[0103] (1) 1 part by weight of 3,4-methylenedioxybenzaldehyde was added to 9 parts by weight of 60°C water, 0.05 parts by weight of cetyl trimethyl ammonium bromide was added, and an oil-in-water emulsion L-A1 was formed in the water phase by shearing emulsification for 30 min at 2000 r / min using a shearing machine.

[0104] 1 part by weight of lauryl alcohol was added to 9 parts by weight of 60°C water, 0.05 parts by weight of cetyl trimethyl ammonium bromide was added, and an oil-in-water emulsion L-A2 was formed in the water phase by shearing emulsification for 30 min at 2000 r / min using a shearing machine.

[0105] 1 part by weight of ethyl cinnamate was added to 9 parts by weight of 60°C water, 0.05 parts by weight of cetyl trimethyl ammonium bromide was added, and an oil-in-water emulsion L-A3 was formed in the water phase by shearing emulsification for 30 min at 2000 r / min using a shearing machine.

[0106] (2) 1 part by weight of melamine, 2 parts by weight of a formaldehyde solution with a concentration of 37 wt.%, and 8 parts by weight of deionized water were fully dissolved in a three-necked flask, the pH value was adjusted to 8.5, and then the mixture was placed in a constant-temperature water bath at 60°C and stirred at 800 r / min for 0.5 h to prepare a melamine resin prepolymer.

[0107] To 1 part by weight of the oil-in-water emulsion L-A1, dilute hydrochloric acid was added dropwise to adjust the pH to 2. 0.10 parts by weight of the prepared melamine resin prepolymer was slowly added to the oil-in-water emulsion, stirred at 700 r / min, and reacted at 75°C for 2 h. After the reaction was completed, the resulting mixture was suction filtered, washed with water and ethanol twice, and dried in an oven at 60°C for 10 h to obtain the pre-coated material Y-A1.

[0108] To 1 part by weight of the oil-in-water emulsion L-A2, dilute hydrochloric acid was added dropwise to adjust the pH to 2. 0.12 parts by weight of the prepared melamine resin prepolymer was slowly added to the oil-in-water emulsion, stirred at 700 r / min, and reacted at 75°C for 2 h. After the reaction was completed, the resulting mixture was suction filtered, washed with water and ethanol twice, and dried in an oven at 60°C for 10 h to obtain the pre-coated material Y-A2.

[0109] To 1 part by weight of the oil-in-water emulsion L-A3, dilute hydrochloric acid was added dropwise to adjust the pH to 2. 0.17 parts by weight of the prepared melamine resin prepolymer was slowly added to the oil-in-water emulsion, stirred at 700 r / min, and reacted at 75°C for 2 h. After the reaction was completed, the resulting mixture was suction filtered, washed with water and ethanol twice, and dried in an oven at 60°C for 10 h to obtain the pre-coated material Y-A3.

[0110] (3) 0.1 parts by weight of chlorinated rubber was dissolved in 1 part by weight of dichloromethane, 1.00 parts by weight of the pre-coated material Y-A1 was added, and mixed well. The resulting mixture was added to 5 parts by weight of water, stirred at 500 r / min, and the temperature was raised to evaporate the solvent to obtain microcapsules W-A1, which had a size of 3-5 μm, an elastic modulus of 0.5 GPa, and a thickness of the capsule wall of 1.2 μm, in accordance with the calculation formula Y = 0.42X 2 -0.92X + T. It was detected that the content of the capsule core in the microcapsules was 45 wt.%, the content of the capsule wall was 55 wt.%, and the mass ratio of the inner layer to the outer layer in the capsule wall was 5:1.

[0111] 0.1 parts by weight of chlorinated rubber was dissolved in 1 part by weight of dichloromethane, 0.55 parts by weight of the pre-coated material Y-A2 was added, and mixed well. The resulting mixture was added to 5 parts by weight of water, stirred at 500 r / min, and the temperature was raised to evaporate the solvent to obtain microcapsules W-A2, which had a size of 5-7 μm, an elastic modulus of 0.9 GPa, and a thickness of the capsule wall of 2.1 μm, in accordance with the calculation formula Y = 0.42X 2 -0.92X + T. It was detected that the content of the capsule core in the microcapsules was 38 wt.%, the content of the capsule wall was 62 wt.%, and the mass ratio of the inner layer to the outer layer in the capsule wall was 3:1.

[0112] 0.1 parts by weight of chlorinated rubber was dissolved in 1 part by weight of dichloromethane, 0.43 parts by weight of the pre-coated material Y-A3 was added, and the mixture was stirred thoroughly. The resulting mixture was added to 5 parts by weight of water, and stirred at 500 r / min, and the temperature was raised to evaporate the solvent, to obtain microcapsules W-A3, which had a size of 7-9 μm, an elastic modulus of 2.2 GPa, and a wall thickness of 3.1 μm, in accordance with the formula Y = 0.42X 2 -0.92X + T. It was found by detection that the content of the core in the microcapsules was 30 wt.%, the content of the wall was 70 wt.%, and the mass ratio of the inner layer to the outer layer in the wall was 2.7:1.

[0113] (4) 0.2 parts by weight of the 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 stirred at 800 r / min under heating at 150°C for 3 h, to obtain an asphalt composition P1.

[0114] Example 2

[0115] (1) 1 part by weight of ionone was added to 7 parts by weight of water at 60°C, 0.06 parts by weight of nonylphenol polyoxyethylene ether was added, and the mixture was sheared and emulsified by a shearing machine at 2500 r / min for 25 min, to form an oil-in-water emulsion L-B1 in the water phase.

[0116] 1 part by weight of myrcenol was added to 7 parts by weight of water at 60°C, 0.06 parts by weight of nonylphenol polyoxyethylene ether was added, and the mixture was sheared and emulsified by a shearing machine at 2500 r / min for 25 min, to form an oil-in-water emulsion L-B2 in the water phase.

[0117] 1 part by weight of phenethyl cinnamate was added to 7 parts by weight of water at 60°C, 0.06 parts by weight of nonylphenol polyoxyethylene ether was added, and the mixture was sheared and emulsified by a shearing machine at 2500 r / min for 25 min, to form an oil-in-water emulsion L-B3 in the water phase.

[0118] (2) 1 part by weight of melamine, 3 parts by weight of a formaldehyde solution with a concentration of 37 wt.%, and 10 parts by weight of deionized water were thoroughly dissolved in a three-necked flask, the pH value was adjusted to 7.5, and then the mixture was placed in a thermostatic water bath at 80°C, and stirred at 600 r / min for 1 h, to prepare a melamine resin prepolymer.

[0119] To 1 part by weight of the oil-in-water emulsion L-B1, dilute hydrochloric acid was added dropwise to adjust the pH 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 was completed, the resulting mixture was suction filtered, washed with water and ethanol twice, respectively, and dried in an oven at 70°C for 8 hours to obtain the pre-coated material Y-B1.

[0120] To 1 part by weight of the oil-in-water emulsion L-B2, dilute hydrochloric acid was added dropwise to adjust the pH 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 was completed, the resulting mixture was suction filtered, washed with water and ethanol twice, respectively, and dried in an oven at 70°C for 8 hours to obtain the pre-coated material Y-B2.

[0121] To 1 part by weight of the oil-in-water emulsion L-B3, dilute hydrochloric acid was added dropwise to adjust the pH 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 was completed, the resulting mixture was suction filtered, washed with water and ethanol twice, respectively, and dried in an oven at 70°C for 8 hours to obtain the pre-coated material Y-B3.

[0122] (3) 0.15 parts by weight of the chlorobutyl 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 thereto and mixed well. The resulting mixture was added to 10 parts by weight of water and stirred at 600 r / min, and the temperature was increased to evaporate the solvent to obtain microcapsules W-B1 having a size of 2-4 μm, an elastic modulus of 0.6 GPa, and a wall thickness of 0.7 μm, which satisfied the equation Y = 0.42X 2 -0.92X + T. It was detected that the content of the core in the microcapsules was 46 wt.%, the content of the wall was 54 wt.%, and the mass ratio of the inner layer to the outer layer in the wall was 4.6:1.

[0123] 0.15 parts by weight of the chlorobutyl 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 thereto and mixed well. The resulting mixture was added to 10 parts by weight of water and stirred at 600 r / min, and the temperature was increased to evaporate the solvent to obtain microcapsules W-B2 having a size of 5-7 μm, an elastic modulus of 0.9 GPa, and a wall thickness of 2.1 μm, which satisfied the equation Y = 0.42X 2 -0.92X + T. It was detected that the content of the core in the microcapsules was 36 wt.%, the content of the wall was 64 wt.%, and the mass ratio of the inner layer to the outer layer in the wall was 3.1:1.

[0124] 0.15 parts by weight of chlorobutyl rubber was dissolved in 3 parts by weight of carbon tetrachloride, 0.70 parts by weight of the pre-coated material Y-B3 was added, and the mixture was stirred thoroughly. The resulting mixture was added to 10 parts by weight of water, and stirring was carried out at 600 r / min, and the temperature was raised to evaporate the solvent, to obtain microcapsules W-B3, which had a size of 7-9 μm, an elastic modulus of 2.4 GPa, and a thickness of the capsule wall of 3.2 μm, in accordance with the formula Y = 0.42X 2 -0.92X + T. It was found by detection that the content of the capsule core in the microcapsules was 30 wt.%, the content of the capsule wall was 70 wt.%, and the mass ratio of the inner layer to the outer layer in the capsule wall was 3.0:1.

[0125] (4) 0.05 parts by weight of the 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 an asphalt composition P2 was obtained by heating at 140°C under stirring at 900 r / min for 3 h.

[0126] Example 3

[0127] (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 was added, and an oil-in-water emulsion L-C1 was formed in the aqueous phase by shearing emulsification with a shearing machine at 3000 r / min for 20 min.

[0128] 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, and an oil-in-water emulsion L-C2 was formed in the aqueous phase by shearing emulsification with a shearing machine at 3000 r / min for 20 min.

[0129] 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, and an oil-in-water emulsion L-C3 was formed in the aqueous phase by shearing emulsification with a shearing machine at 3000 r / min for 20 min.

[0130] (2) 1 part by weight of melamine, 2 parts by weight of a formaldehyde solution having a concentration of 37 wt.%, and 9 parts by weight of deionized water were thoroughly dissolved in a three-necked flask, and the pH value was adjusted to 8, and then the mixture was placed in a thermostatic water bath at 70°C, and stirring was carried out at 500 r / min for 2 h, to obtain a melamine resin prepolymer.

[0131] To 1 part by weight of the oil-in-water emulsion L-C1, dilute hydrochloric acid was added dropwise to adjust the pH to 3. 0.14 parts by weight of the prepared melamine resin prepolymer was slowly added to the oil-in-water emulsion, stirred at 500 r / min, and reacted at 65°C for 3 h. After the reaction was completed, the resulting mixture was suction filtered, washed with water and ethanol twice, respectively, and dried in an oven at 90°C for 6 h to obtain the pre-coated material Y-C1.

[0132] To 1 part by weight of the oil-in-water emulsion L-C2, dilute hydrochloric acid was added dropwise to adjust the pH to 3. 0.18 parts by weight of the prepared melamine resin prepolymer was slowly added to the oil-in-water emulsion, stirred at 500 r / min, and reacted at 65°C for 3 h. After the reaction was completed, the resulting mixture was suction filtered, washed with water and ethanol twice, respectively, and dried in an oven at 90°C for 6 h to obtain the pre-coated material Y-C2.

[0133] To 1 part by weight of the oil-in-water emulsion L-C3, dilute hydrochloric acid was added dropwise to adjust the pH to 3. 0.28 parts by weight of the prepared melamine resin prepolymer was slowly added to the oil-in-water emulsion, stirred at 500 r / min, and reacted at 65°C for 3 h. After the reaction was completed, the resulting mixture was suction filtered, washed with water and ethanol twice, respectively, and dried in an oven at 90°C for 6 h to obtain the pre-coated material Y-C3.

[0134] (3) 0.2 parts by weight of the butadiene-styrene rubber was dissolved in 3 parts by weight of dichloromethane, 1.34 parts by weight of the pre-coated material Y-C1 was added, and mixed well. The resulting mixture was added to 25 parts by weight of water, stirred at 700 r / min, and the temperature was raised to evaporate the solvent to obtain the microcapsule W-C1, which had a size of 3-5 μm, an elastic modulus of 0.6 GPa, and a thickness of the capsule wall of 1.3 μm, in accordance with the calculation formula Y = 0.42X 2 -0.92X + T. It was detected that the content of the capsule core in the microcapsule was 44 wt.%, the content of the capsule wall was 56 wt.%, and the mass ratio of the inner layer to the outer layer in the capsule wall was 3.3:1.

[0135] 0.2 parts by weight of the butadiene-styrene rubber was dissolved in 3 parts by weight of dichloromethane, 0.90 parts by weight of the pre-coated material Y-C2 was added, and mixed well. The resulting mixture was added to 25 parts by weight of water, stirred at 700 r / min, and the temperature was raised to evaporate the solvent to obtain the microcapsule W-C2, which had a size of 5-7 μm, an elastic modulus of 1.1 GPa, and a thickness of the capsule wall of 2.3 μm, in accordance with the calculation formula Y = 0.42X 2 -0.92X + T. It was detected that the content of the capsule core in the microcapsule was 36 wt.%, the content of the capsule wall was 64 wt.%, and the mass ratio of the inner layer to the outer layer in the capsule wall was 2.5:1.

[0136] 0.2 parts by weight of butadiene-styrene rubber was dissolved in 3 parts by weight of dichloromethane, 0.85 parts by weight of the pre-coated material Y-C3 was added, and the mixture was stirred thoroughly. The resulting mixture was added to 25 parts by weight of water, and stirring was carried out at 700 r / min, and the temperature was raised to evaporate the solvent, to obtain microcapsules W-C3, which had a size of 7-9 μm, an elastic modulus of 2.7 GPa, and a thickness of the capsule wall of 3.4 μm, in accordance with the formula Y = 0.42X 2 -0.92X + T. It was found by detection that the content of the capsule core in the microcapsules was 27 wt.%, the content of the capsule wall was 73 wt.%, and the mass ratio of the inner layer to the outer layer in the capsule wall was 2.8:1.

[0137] (4) 0.1 parts by weight of the 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-cresol, 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 an asphalt composition P3 was obtained by heating at 170°C under stirring at 500 r / min for 1 h.

[0138] Example 4

[0139] (1) 1 part by weight of p-methoxybenzaldehyde was added to 8 parts by weight of water at 60°C, and 0.06 parts by weight of sodium dodecylbenzenesulfonate was added, and the mixture was sheared and emulsified by a shearing machine at 4000 r / min for 20 min, to form an oil-in-water emulsion L-D1 in the water phase.

[0140] 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, and the mixture was sheared and emulsified by a shearing machine at 4000 r / min for 20 min, to form an oil-in-water emulsion L-D2 in the water phase.

[0141] 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, and the mixture was sheared and emulsified by a shearing machine at 4000 r / min for 20 min, to form an oil-in-water emulsion L-D3 in the water phase.

[0142] (2) 1 part by weight of melamine, 3 parts by weight of a formaldehyde solution with a concentration of 37 wt.%, and 9 parts by weight of deionized water were thoroughly dissolved in a three-necked flask, and the pH value was adjusted to 7.5, and then the mixture was placed in a thermostatic water bath at 60°C, and stirred at 700 r / min for 2 h, to obtain a melamine resin prepolymer.

[0143] To 1 part by weight of the oil-in-water emulsion L-D1, dilute hydrochloric acid was added dropwise to adjust the pH to 3. 0.11 parts by weight of the prepared melamine resin prepolymer was slowly added to the oil-in-water emulsion, stirred at 500 r / min, and reacted at 60°C for 5 h. After the reaction was completed, the resulting mixed solution was suction filtered, washed with water and ethanol twice, respectively, and dried in an oven at 90°C for 6 h to obtain the pre-coated material Y-D1.

[0144] To 1 part by weight of the oil-in-water emulsion L-D2, dilute hydrochloric acid was added dropwise to adjust the pH to 3. 0.15 parts by weight of the prepared melamine resin prepolymer was slowly added to the oil-in-water emulsion, stirred at 500 r / min, and reacted at 60°C for 5 h. After the reaction was completed, the resulting mixed solution was suction filtered, washed with water and ethanol twice, respectively, and dried in an oven at 90°C for 6 h to obtain the pre-coated material Y-D2.

[0145] To 1 part by weight of the oil-in-water emulsion L-D3, dilute hydrochloric acid was added dropwise to adjust the pH to 3. 0.21 parts by weight of the prepared melamine resin prepolymer was slowly added to the oil-in-water emulsion, stirred at 500 r / min, and reacted at 60°C for 5 h. After the reaction was completed, the resulting mixed solution was suction filtered, washed with water and ethanol twice, respectively, and dried in an oven at 90°C for 6 h to obtain the pre-coated material Y-D3.

[0146] (3) 0.17 parts by weight of chlorinated rubber was dissolved in 1.7 parts by weight of dichloromethane, 1.69 parts by weight of the pre-coated material Y-D1 was added, and mixed well. The resulting mixture was added to 18 parts by weight of water, stirred at 800 r / min, and the temperature was raised to evaporate the solvent to obtain microcapsules W-D1, which had a size of 3-5 μm, an elastic modulus of 0.5 GPa, and a thickness of the capsule wall of 1.2 μm, in accordance with the calculation formula Y = 0.42X 2 -0.92X + T. It was detected that the content of the capsule core in the microcapsules was 46 wt.%, the content of the capsule wall was 54 wt.%, and the mass ratio of the inner layer to the outer layer in the capsule wall was 4.9:1.

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

[0148] 0.17 parts by weight of chlorinated rubber was dissolved in 1.7 parts by weight of dichloromethane, 0.70 parts by weight of the pre-coated material Y-D3 was added, and the mixture was stirred thoroughly. The resulting mixture was added to 18 parts by weight of water, and stirring was carried out at 800 r / min, and the temperature was raised to evaporate the solvent, to obtain microcapsules W-D3, which had a size of 7-9 μm, an elastic modulus of 2.5 GPa, and a thickness of the capsule wall of 3.3 μm, in accordance with the formula Y = 0.42X 2 -0.92X + T. It was found by detection that the content of the capsule core in the microcapsules was 28 wt.%, the content of the capsule wall was 72 wt.%, and the mass ratio of the inner layer to the outer layer in the capsule wall was 2.7:1.

[0149] (4) 0.1 parts by weight of the 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 diethyl phosphonate, and 0.05 parts by weight of p-tert-butylcatechol were added to 100 parts by weight of straight-run bitumen (penetration 70 1 / 10 mm) to obtain a bitumen composition P4, under heating at 160°C and stirring at 800 r / min for 2 h.

[0150] Example 5

[0151] (1) 1 part by weight of methylionone was added to 7 parts by weight of water at 60°C, 0.08 parts by weight of cetyltrimethylammonium chloride was added, and shearing emulsification was carried out using a shearing machine at 3000 r / min for 30 min to form an oil-in-water emulsion L-E1 in the water phase.

[0152] 1 part by weight of 3-propenyl-6-ethoxyphenol was added to 7 parts by weight of water at 60°C, 0.08 parts by weight of cetyltrimethylammonium chloride was added, and shearing emulsification was carried out using a shearing machine at 3000 r / min for 30 min to form an oil-in-water emulsion L-E2 in the water phase.

[0153] 1 part by weight of terpinyl acetate was added to 7 parts by weight of water at 60°C, 0.08 parts by weight of cetyltrimethylammonium chloride was added, and shearing emulsification was carried out using a shearing machine at 3000 r / min for 30 min to form an oil-in-water emulsion L-E3 in the water phase.

[0154] (2) 1 part by weight of melamine, 2 parts by weight of a formaldehyde solution with a mass concentration of 37%, and 9 parts by weight of deionized water were thoroughly dissolved in a three-necked flask, the pH value was adjusted to 8, and then the mixture was placed in a thermostatic water bath at 90°C, and stirring was carried out at 400 r / min for 3.5 h to prepare a melamine resin prepolymer.

[0155] To 1 part by weight of the oil-in-water emulsion L-E1, dilute hydrochloric acid was added dropwise to adjust the pH value to 2, and 0.10 parts by weight of the prepared melamine resin prepolymer was slowly added dropwise into the oil-in-water emulsion, stirred at 800 r / min, and reacted at 90°C for 1 h. After the reaction was completed, the obtained mixed solution was suction filtered, washed with water and ethanol for 2 times respectively, and dried in an oven at 60°C for 9 h to obtain the pre-coated material Y-E1.

[0156] To 1 part by weight of the oil-in-water emulsion L-E2, dilute hydrochloric acid was added dropwise to adjust the pH value to 2, and 0.15 parts by weight of the prepared melamine resin prepolymer was slowly added dropwise into the oil-in-water emulsion, stirred at 800 r / min, and reacted at 90°C for 1 h. After the reaction was completed, the obtained mixed solution was suction filtered, washed with water and ethanol for 2 times respectively, and dried in an oven at 60°C for 9 h to obtain the pre-coated material Y-E2.

[0157] To 1 part by weight of the oil-in-water emulsion L-E3, dilute hydrochloric acid was added dropwise to adjust the pH value to 2, and 0.22 parts by weight of the prepared melamine resin prepolymer was slowly added dropwise into the oil-in-water emulsion, stirred at 800 r / min, and reacted at 90°C for 1 h. After the reaction was completed, the obtained mixed solution was suction filtered, washed with water and ethanol for 2 times respectively, and dried in an oven at 60°C for 9 h to obtain the pre-coated material Y-E3.

[0158] (3) 0.25 parts by weight of the chlorinated rubber was dissolved in 5 parts by weight of dichloromethane, and 1.48 parts by weight of the pre-coated material Y-E1 was added and mixed well. The obtained mixture was added into 30 parts by weight of water, stirred at 700 r / min, and the temperature was increased to volatilize the solvent to obtain the microcapsule W-E1, which had a size of 3-5 μm, an elastic modulus of 0.6 GPa, and a thickness of the capsule wall of 0.8 μm, which was consistent with the calculation formula Y=0.42X2-0.92X+T. It was detected that the content of the capsule core in the microcapsule was 48 wt.%, the content of the capsule wall was 52 wt.%, and the mass ratio of the inner layer to the outer layer in the capsule wall was 2.6:1.

[0159] 0.25 parts by weight of the 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 mixed well. The obtained mixture was added into 30 parts by weight of water, stirred at 700 r / min, and the temperature was increased to volatilize the solvent to obtain the microcapsule W-E2, which had a size of 5-7 μm, an elastic modulus of 1.0 GPa, and a thickness of the capsule wall of 2.2 μm, which was consistent with the calculation formula Y=0.42X2-0.92X+T. It was detected 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.

[0160] The microcapsule W-E3 having a size of 7-9 μm, an elastic modulus of 2.4 GPa, and a wall thickness of 3.2 μm, which satisfies the formula Y = 0.42X2-0.92X+T, was obtained by adding 0.25 parts by weight of chlorinated rubber dissolved in 5 parts by weight of dichloromethane, 0.98 parts by weight of the pre-coated material Y-E3, and stirring the mixture well, adding the resulting mixture to 30 parts by weight of water, and stirring at 700 r / min while raising the temperature to evaporate the solvent. The content of the core in the microcapsule was 29 wt.%, the content of the wall was 71 wt.%, and the mass ratio of the inner layer to the outer layer in the wall was 2.5:1, as determined by measurement.

[0161] (4) 0.2 parts by weight of the microcapsule W-E1, 0.2 parts by weight of the microcapsule W-E2, 0.2 parts by weight of the microcapsule 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 stirred at 1000 r / min for 3 h under heating at 140°C to obtain an asphalt composition P5.

[0162] Comparative Example 1

[0163] An asphalt composition was prepared according to the method of Example 5, except that the microcapsule W-E2 and the microcapsule W-E3 in step (4) were replaced with the same weight of the microcapsule W-E1 to obtain an asphalt composition D1.

[0164] Comparative Example 2

[0165] An asphalt composition was prepared according to the method of Example 5, except that the microcapsule W-E1 and the microcapsule W-E3 in step (4) were replaced with the same weight of the microcapsule W-E2 to obtain an asphalt composition D2.

[0166] Comparative Example 3

[0167] An asphalt composition was prepared according to the method of Example 5, except that the microcapsule W-E1 and the microcapsule W-E2 in step (4) were replaced with the same weight of the microcapsule W-E3 to obtain an asphalt composition D3.

[0168] Comparative Example 4

[0169] (Comparative Example 4 is compared with Example 1)

[0170] To 100 parts by weight of straight-run pitch (penetration 701 / 10 mm) were added 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, and the mixture was stirred at 800 r / min for 3 h under heating at 150°C to obtain pitch composition D4.

[0171] Comparative Example 5

[0172] (Comparative Example 1 was compared with Example 1)

[0173] (1) To 9 parts by weight of water at 60°C was added 1 part by weight of 3,4-methylenedioxybenzaldehyde, and 0.05 parts by weight of cetyltrimethylammonium bromide was added, and the mixture was sheared at 2000 r / min for 30 min to form an oil-in-water emulsion L-A1 in the water phase.

[0174] To 9 parts by weight of water at 60°C was added 1 part by weight of myrcenol, and 0.05 parts by weight of cetyltrimethylammonium bromide was added, and the mixture was sheared at 2000 r / min for 30 min to form an oil-in-water emulsion L-A2 in the water phase.

[0175] To 9 parts by weight of water at 60°C was added 1 part by weight of ethyl cinnamate, and 0.05 parts by weight of cetyltrimethylammonium bromide was added, and the mixture was sheared at 2000 r / min for 30 min to form an oil-in-water emulsion L-A3 in the water phase.

[0176] (2) In a three-necked flask, 1 part by weight of melamine, 2 parts by weight of a formaldehyde solution having a concentration of 37 wt.%, and 8 parts by weight of deionized water were dissolved, and the pH was adjusted to 8.5, and then the mixture was stirred at 800 r / min in a constant-temperature water bath at 60°C for 0.5 h to prepare a melamine resin prepolymer.

[0177] To 1 part by weight of the oil-in-water emulsion L-A1 was added dilute hydrochloric acid dropwise, and the pH was adjusted to 2, and 0.10 parts by weight of the prepared melamine resin prepolymer was added dropwise to the oil-in-water emulsion, and the mixture was stirred at 700 r / min and reacted at 75°C for 2 h. After the reaction was completed, the resulting mixture was suction-filtered, washed with water and ethanol twice, and dried in an oven at 60°C for 10 h to obtain a pre-coated material Y-A1.

[0178] To 1 part by weight of the oil-in-water emulsion L-A2, dilute hydrochloric acid was added dropwise to adjust the pH to 2, and 0.12 parts by weight of the prepared melamine resin prepolymer was slowly added dropwise to the oil-in-water emulsion, stirred at 700 rpm, and reacted at 75°C for 2 hours. After the reaction was completed, the resulting mixture was suction filtered, washed with water and ethanol twice, respectively, and dried in an oven at 60°C for 10 hours to obtain a pre-coated material Y-A2.

[0179] To 1 part by weight of the oil-in-water emulsion L-A3, dilute hydrochloric acid was added dropwise to adjust the pH to 2, and 0.17 parts by weight of the prepared melamine resin prepolymer was slowly added dropwise to the oil-in-water emulsion, stirred at 700 rpm, and reacted at 75°C for 2 hours. After the reaction was completed, the resulting mixture was suction filtered, washed with water and ethanol twice, respectively, and dried in an oven at 60°C for 10 hours to obtain a pre-coated material Y-A3.

[0180] (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 stirred at 800 rpm for 3 hours under heating at 150°C to obtain an asphalt composition D5.

[0181] Comparative Example 6

[0182] (Comparative Example with Example 1)

[0183] (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 cetyltrimethylammonium bromide was added, and shearing emulsification was performed using a shearing machine at 2000 rpm for 30 minutes to form an oil-in-water emulsion L-A1 in the water phase.

[0184] 1 part by weight of laurolyenol was added to 9 parts by weight of water at 60°C, and 0.05 parts by weight of cetyltrimethylammonium bromide was added, and shearing emulsification was performed using a shearing machine at 2000 rpm for 30 minutes to form an oil-in-water emulsion L-A2 in the water phase.

[0185] 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 cetyltrimethylammonium bromide was added, and shearing emulsification was performed using a shearing machine at 2000 rpm for 30 minutes to form an oil-in-water emulsion L-A3 in the water phase.

[0186] (2) Dissolve 1 part by weight of melamine, 2 parts by weight of formaldehyde solution with a concentration of 37 wt.% and 8 parts by weight of deionized water in a three-necked flask, adjust the pH value to 8.5, and then place it in a constant temperature water bath at 60°C and stir at 800 r / min for 0.5 h to obtain melamine resin prepolymer.

[0187] 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. The mixture was stirred at 700 r / min and reacted at 75 °C for 2 h. After the reaction was completed, the resulting mixed solution was filtered, washed twice with water and ethanol respectively, and dried in an oven at 60 °C for 10 h to obtain the pre-coated material Y-A1.

[0188] 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. The mixture was stirred at 700 r / min and reacted at 75 °C for 2 h. After the reaction was completed, the resulting mixed solution was filtered, washed twice with water and ethanol respectively, and dried in an oven at 60 °C for 10 h to obtain the pre-coated material Y-A2.

[0189] 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. The mixture was stirred at 700 r / min and reacted at 75 °C for 2 h. After the reaction was completed, the resulting mixed solution was filtered, washed twice with water and ethanol respectively, and dried in an oven at 60 °C for 10 h to obtain the pre-coated material Y-A3.

[0190] (3) Mix 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, and stir at 500 r / min to obtain microcapsules W-F1. In these microcapsules, the chlorinated rubber does not form a membrane covering the outermost layer of the microcapsule; its size is 4-6 μm, its elastic modulus is 0.8 GPa, and its capsule wall thickness is 2.3 μm, which does not conform to the calculation formula Y = 0.42X. 2 -0.92X+T.

[0191] 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. In these microcapsules, the chlorinated rubber does not form a membrane covering the outermost layer; its size is 6-8 μm, its elastic modulus is 1.9 GPa, and its wall thickness is 3.4 μm, which does not conform to the calculation formula Y = 0.42X. 2 -0.92X+T.

[0192] 0.1 parts by weight of chlorinated rubber, 0.43 parts by weight of the pre-coated material Y-A3 and 5 parts by weight of water were mixed with stirring at 500 r / min to obtain microcapsules W-F3, wherein, in the microcapsules, the chlorinated rubber is not wrapped in the form of a film in the outermost layer of the microcapsules, the size is 8-10 μm, the modulus of elasticity is 2.5 GPa, the thickness of the capsule wall is 4.0 μm, and the calculation formula Y = 0.42X is not satisfied. 2 -0.92X + T.

[0193] (4) 0.2 parts by weight of the 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 stirred at 800 r / min under heating at 150°C for 3 h to obtain an asphalt composition D6.

[0194] Comparative Example 7

[0195] (Comparative Example with Example 1)

[0196] The microcapsules were prepared in the same manner as in 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.

[0197] Microcapsules W-G1 were obtained, which had a size of 4-6 μm, a modulus of elasticity of 1.0 GPa and a capsule wall thickness of 1.7 μm, and the calculation formula Y = 0.42X was not satisfied. 2 -0.92X + T.

[0198] Microcapsules W-G2 were obtained, which had a size of 6-8 μm, a modulus of elasticity of 2.3 GPa and a capsule wall thickness of 2.7 μm, and the calculation formula Y = 0.42X was not satisfied. 2 -0.92X + T.

[0199] Microcapsules W-G3 were obtained, which had a size of 8-10 μm, a modulus of elasticity of 3.7 GPa and a capsule wall thickness of 3.6 μm, and the calculation formula Y = 0.42X was not satisfied. 2 -0.92X + T.

[0200] (4) 0.2 parts by weight of the microcapsule W-G1, 0.05 parts by weight of the microcapsule W-G2, 0.1 parts by weight of the microcapsule 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 stirred at 800 r / min under heating at 150°C for 3h to obtain an asphalt composition D7.

[0201] Test Example 1

[0202] The asphalt compositions prepared in the above examples and comparative examples were subjected to asphalt smoke test using straight-run asphalt (penetration 70 1 / 10 mm), natural asphalt (penetration 50 1 / 10 mm), and SBS modified asphalt (penetration 60 1 / 10 mm) as asphalt base. Specifically, the asphalt smoke was enriched under heating at 163°C for 6h, and the asphalt smoke was subjected to test analysis using gas chromatography and total hydrocarbon analyzer.

[0203] Table 1: Results of asphalt smoke test

[0204]

[0205] As can be seen from the results in Table 1, the asphalt additive and asphalt composition according to the present application can achieve the release of different active components at different release rates by using three kinds of microcapsules with different release rates in combination, thereby effectively reducing the emission of asphalt smoke and reducing the pollution to the environment.

[0206] The above describes the preferred embodiments of the present application in detail, but the present application is not limited thereto. Within the technical concept of the present application, various simple modifications can be made to the technical solutions of the present application, including the combination of various technical features in any other suitable manner, and these simple modifications and combinations should also be considered as the disclosed content of the present application, and all fall within the protection scope of the present application.

Claims

1. An asphalt additive, characterized in that, The asphalt additive contains first microcapsules, second microcapsules and third microcapsules, wherein the first microcapsules, the second microcapsules and the third microcapsules each include 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 microcapsules is 0.5-2 μm, the capsule wall thickness of the second microcapsules is greater than 2 μm and less than or equal to 3 μm, and the capsule wall thickness of the third microcapsules is greater than 3 μm and less than or equal to 5 μm; in the first microcapsules, the second microcapsules and the third microcapsules, 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; in the first microcapsules, the second microcapsules and the third microcapsules, the elastic modulus of the microcapsules 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 microcapsules, the unit is GPa; X is the thickness of the capsule wall, the unit is μm; T is 1±0.1; The elastic modulus of the microcapsules is obtained by mechanical property testing of the microcapsules by a nanoindenter, and the thickness of the capsule wall is obtained by testing the frozen section of the microcapsules by a scanning electron microscope; The active component is an inhibitor for inhibiting the release of asphalt smoke gas, and is selected from at least one of aldehyde compounds, ketone compounds, alcohol compounds, phenolic compounds and ester compounds; The aldehyde compound is selected from at least one of aliphatic aldehydes with carbon atom number greater than or equal to 7 and aromatic aldehydes with carbon atom number greater than or equal to 6; The ketone compound is selected from at least one of aliphatic ketones with carbon atom number greater than or equal to 8 and aromatic ketones with carbon atom number greater than or equal to 8; The alcohol compound is an alcohol with carbon atom greater than 6; The phenolic compound is a phenol with carbon atom greater than or equal to 6; The ester compound is an ester with carbon atom number greater than 7.

2. The asphalt additive of claim 1, wherein, The mass ratio of the first microcapsules, the second microcapsules and the third microcapsules is 1:(0.25-4):(0.25-4).

3. The asphalt additive of claim 1, wherein, The mass ratio of the inner wall layer to the outer wall layer is 2.4-5:

1.

4. The asphalt additive of claim 1, wherein, The resin is at least one of melamine resin, urea-formaldehyde resin and polymethyl methacrylate.

5. The asphalt additive of claim 1, wherein, The rubber material is at least one of chlorinated rubber, styrene butadiene rubber and chloroprene rubber.

6. The asphalt additive of claim 1, wherein, In the first microcapsules, the mass ratio of the capsule core to the capsule wall is 1:0.9-1.5; in the second microcapsules, the mass ratio of the capsule core to the capsule wall is 1:1.5-2.2; and in the third microcapsules, the mass ratio of the capsule core to the capsule wall is 1:2.2-3.

7. The asphalt additive of claim 1, wherein, The aldehyde compound is selected from at least one of p-methylbenzaldehyde, decanal, o-carboxybenzaldehyde, p-isopropylbenzaldehyde, cinnamyl aldehyde, p-hydroxybenzaldehyde, p-methoxybenzaldehyde, 2-methyl-3-(3,4-methylene-dioxyphenyl) propionaldehyde, 3,4-methylenedioxybenzaldehyde, 3-(4-isopropylphenyl)-2-methylpropionaldehyde, ethyl vanillin, phenylacetaldehyde, anisic aldehyde, nonadiene-2,6-aldehyde, 2,6-dimethyl-2,6-octadienal, vanillin, citronellal, nerol, hydroxymethyl pentyl cyclohexene acetal, p-diethylaminobenzaldehyde and undecenal. the ketone compound is at least one of 6-methyl-3,5-heptadien-2-one, 2-undecanone, acetophenone, ionone, irone, methylionone, damascone and dihydrodamascone; the alcohol compound is at least one of cinnamic 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, dihydromycenol, tetrahydrolinalool and nerolidol; the phenol compound is at least one of thymol, ethyl maltol, methyl maltol, 3-propenyl-6-ethoxyphenol and isoeugenol; the ester compound is at least one of methyl salicylate, methyl cinnamate, ethyl cinnamate, ethyl phenylacetate, methyl phenylacetate, geranyl phenylacetate, phenethyl phenylacetate, isoamyl phenylacetate, benzyl salicylate, p-xylyl methyl acetate, benzyl acetate, isobutyl benzoate, isoamyl salicylate, benzyl cinnamate, phenethyl cinnamate, linalyl formate, linalyl acetate, linalyl isobutyrate, menthyl acetate, terpinyl acetate and borneol acetate.

8. The asphalt additive of claim 1, wherein, 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.

9. An asphalt composition characterized in that, The asphalt composition contains asphalt and the asphalt additive of claim 1.

10. The asphalt composition according to claim 9, characterized in that The content of the asphalt additive is 0.1-2 parts by weight with respect to 100 parts by weight of the asphalt.

11. The asphalt composition of claim 9, wherein, The asphalt composition further contains an antioxidant, and the content of the antioxidant is 0.01-0.1 parts by weight with respect to 100 parts by weight of the asphalt.

12. The asphalt composition of claim 11, wherein, The antioxidant is at least one of bis(3,5-tri-tert-butyl-4-hydroxyphenyl) sulfide, p-tert-butylcatechol, 3,5-di-tert-butyl-4-hydroxybenzyl diethylphosphonate, n-octadecyl β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, isooctyl β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, 4,4'-thiobis(6-tert-butyl-3-methylphenol), pentaerythrityl tetra-β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, 1,3,5-trimethyl-2,4,6-tris(3,5-di-tert-butyl-4-hydroxybenzyl)benzene, 2,6-di-tert-butyl-p-cresol, 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.

13. The asphalt composition of claim 9, wherein The asphalt is at least one of straight-run asphalt, polymer modified asphalt and natural asphalt.

14. The asphalt composition of claim 9, wherein The asphalt has a penetration of 30-210 1 / 10 mm.

15. A process for the preparation of the bitumen composition according to any one of claims 9 to 14, characterized in that, The method comprises: The asphalt composition contains asphalt and the asphalt additive of claim 1. The content of the asphalt additive is 0.1-2 parts by weight with respect to 100 parts by weight of the asphalt. The asphalt composition further contains an antioxidant, and the content of the antioxidant is 0.01-0.1 parts by weight with respect to 100 parts by weight of the asphalt. The antioxidant is at least one of bis(3,5-tri-tert-butyl-4-hydroxyphenyl) sulfide, p-tert-butylcatechol, 3,5-di-tert-butyl-4-hydroxybenzyl diethylphosphonate, n-octadecyl β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, isooctyl β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, 4,4'-thiobis(6-tert-butyl-3-methylphenol), pentaerythrityl tetra-β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, 1,3,5-trimethyl-2,4,6-tris(3,5-di-tert-butyl-4-hydroxybenzyl)benzene, 2,6-di-tert-butyl-p-cresol, 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. The asphalt is at least one of straight-run asphalt, polymer modified asphalt and natural asphalt. The asphalt has a penetration of 30-210 1 / 10 mm. The method comprises: (1) respectively preparing the first microcapsule, the second microcapsule and the third microcapsule, the preparation process being: S1, mixing the active component, the emulsifier and water to form an oil-in-water emulsion; S2, reacting the oil-in-water emulsion with a resin prepolymer, then filtering, washing and drying to obtain a pre-coated material; S3, mixing a rubber material with the pre-coated material in the presence of a volatile solvent, then mixing the obtained mixture with water, and heating to volatilize the volatile solvent to obtain a microcapsule; (2) mixing the molten asphalt, the first microcapsule, the second microcapsule, the third microcapsule and optional antioxidant.

16. The method of claim 15, wherein, 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 of claim 15, wherein, In step S2, the pH value of the oil-in-water emulsion is adjusted to below 5 before the oil-in-water emulsion is reacted with the resin prepolymer.

18. The method of claim 15, wherein, In step S2, the resin prepolymer is a melamine resin prepolymer; 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, then placing in a constant temperature water bath at 60-90℃, and reacting for 0.5-3.5h under stirring; The concentration of the formaldehyde solution is 30-40wt.%; The mass ratio of the melamine, the formaldehyde solution and water is 1:(2-3):(8-10).

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

20. The method of claim 15, wherein, The emulsifier is selected from at least one of sodium naphthenate, sodium dodecyl sulfate, sodium dodecyl benzene sulfonate, cetyltrimethylammonium chloride, cetyltrimethylammonium bromide, cetyl dimethyl hydroxyethyl ammonium chloride, nonylphenol polyoxyethylene ether, octylphenol polyoxyethylene ether and cetyl polyoxyethylene ether.

21. The method of claim 15, wherein, The volatile solvent is selected from at least one of carbon tetrachloride, dichloromethane and trichloroethylene.

Images