Environment-friendly asphalt modifier, preparation method and application thereof

Abstract

The present application belongs to the field of asphalt, and particularly relates to an environment-friendly asphalt modifier and a preparation method and application thereof. The environment-friendly asphalt modifier provided by the present application comprises: 20-65% of a dispersing agent; 15-40% of an antioxidant; and 15-40% of an odor reagent, wherein the odor reagent comprises one or more of limonene, pinene, isopinene, phellandrene, alpha-terpinene, pinene, sylvestrene, myrcenol, myrtenyl alcohol, verbenyl alcohol, citral, citronellal, hydroxy-citronellal, osthole, perilene, menthone, carvone, dihydrocarvone, piperitone, camphor, methyl nonyl acetaldehyde, isopentenyl aldehyde, para-cymene, ethyl cinnamic aldehyde, alpha-hexyl cinnamic aldehyde, 9-decenal, 2-tridecenal and hexadecenal. The asphalt modifier provided by the present application can significantly improve the aging resistance of asphalt during mixing and construction, and significantly reduce the emission of harmful pollutants.

Description

[0001] This application is a divisional application of the invention patent application filed by the applicant on July 14, 2020, with application number 202010673703.6 and title "An environmentally friendly asphalt modifier and its preparation method and application". Technical Field

[0002] This invention belongs to the field of asphalt, and particularly relates to an environmentally friendly asphalt modifier, its preparation method, and its application. Background Technology

[0003] Asphalt is a temperature-sensitive material; its viscosity decreases as temperature increases. To achieve better workability during mixing and construction, asphalt is typically heated. The mixing temperature for ordinary base asphalt is around 160℃, while modified asphalt requires 180℃. At this temperature, asphalt undergoes a complex aging process, primarily involving dehydrogenation condensation and oxidation. The volatilization of light components and the intense chemical reactions in asphalt not only degrade its performance indicators but also generate large amounts of harmful pollutants such as hydrogen sulfide, sulfur dioxide, and VOCs.

[0004] Industries that easily generate toxic and organic pollutants and foul odors will face a crisis. Environmentally friendly and odor-free asphalt products have become a research hotspot in the asphalt industry. How to effectively reduce the emission of harmful pollutants during asphalt mixing and construction has become a technical problem that the asphalt industry urgently needs to solve. Summary of the Invention

[0005] In view of this, the purpose of this invention is to provide an environmentally friendly asphalt modifier, its preparation method and application. The asphalt modifier provided by this invention can improve the aging resistance of asphalt during mixing and construction, and reduce the emission of harmful pollutants.

[0006] This invention provides an environmentally friendly asphalt modifier, comprising, by weight percentage:

[0007] Dispersant 20-65%;

[0008] Antioxidant 15-40%;

[0009] Odor reactant 15-40%;

[0010] The odor reactants include one or more of limonene, terpinene, isoterpinene, phellandrene, α-terpinene, pinene, sennayl alcohol, myrtol, verbenaenoyl alcohol, citral, citronellol, hydroxycitronellol, phellandrene, perillaldehyde, menthone, carvone, dihydrocarvone, piperone, camphor, methylnonalan, isopentenal, methylpentylcinnamaldehyde, ethylcinnamaldehyde, α-hexylcinnamaldehyde, 9-decenal, 2-tridecenal, and hexadecenal.

[0011] Preferably, the odor reactant includes a variety of limonene, terpinene, citral, citronellol, α-hexylcinnamaldehyde, and hexadecenal.

[0012] Preferably, the odor reactant is a mixture of limonene, terpinene, and α-hexylcinnamaldehyde, or a mixture of citral, citronellol, and hexadecenal, or a mixture of α-hexylcinnamaldehyde and hexadecenal.

[0013] Preferably, the dispersant comprises one or more of the following: ethylene glycol butyl ether acetate, diethylene glycol butyl ether acetate, pentaerythritol tetraisooctanoate, pentaerythritol benzoate, pentaerythritol isononanoate, pentaerythritol triacrylate, pentaerythritol tetraisostearate, pentaerythritol tetraacrylate, rosin glyceryl ester, rosin pentaerythritol ester, pentaerythritol oleate, pentaerythritol tetramyristate, neopentyl glycol dioleate, glyceryl monofatty acid ester, ethylene glycol oleate, glycerol monooctadecanoate, ethylene glycol dimethacrylate, triethylene glycol diisooctanoate, succinimide, bis(succinimide), boronized succinimide, and polyisobutylene succinamide.

[0014] Preferably, the dispersant comprises one or more of succinimide, pentaerythritol oleate, and glycerol monofatty acid ester.

[0015] Preferably, the antioxidant comprises one or more of pentaerythritol diacetyl phosphite, 2,6-di-tert-butyl-4-methylphenol, octadecyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 1,3,5-trimethyl-2,4,6-tris(3,5-tert-butyl-4-hydroxybenzyl)benzene, and 1,3,5-tris(3,5-di-tert-butyl-4-hydroxybenzyl)isocyanuric acid.

[0016] Preferably, the antioxidant comprises pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] and / or pentaerythritol dioctadecyl phosphite.

[0017] This invention provides a method for preparing the environmentally friendly asphalt modifier described in the above technical solution, comprising the following steps:

[0018] Dispersant, antioxidant and odor reactant are heated and mixed to obtain an environmentally friendly asphalt modifier.

[0019] This invention provides an environmentally friendly asphalt, comprising the environmentally friendly asphalt modifier and base asphalt described in the above technical solution.

[0020] Preferably, the mass ratio of the environmentally friendly asphalt modifier to the base asphalt is (0.01~0.1):100.

[0021] Compared with existing technologies, this invention provides an environmentally friendly asphalt modifier, its preparation method, and its application. The environmentally friendly asphalt modifier provided by this invention comprises: 20-65% dispersant; 15-40% antioxidant; and 15-40% odor reactant. The odor reactant includes one or more of the following: limonene, terpinene, isoterpinene, phellandrene, α-terpinene, pinene, sennayl alcohol, myrtol, verbenaenoyl alcohol, citral, citronellol, hydroxycitronellol, phellandrene, perillaldehyde, menthone, carvone, dihydrocarvone, piperonone, camphor, methylnonacetaldehyde, isopentenal, methylpentylcinnamaldehyde, ethylcinnamaldehyde, α-hexylcinnamaldehyde, 9-decenal, 2-tridecenal, and hexadecenal. The asphalt modifier provided by this invention can significantly improve the aging resistance of asphalt during mixing and construction, and significantly reduce the emission of harmful pollutants. Experimental results show that after adding the asphalt modifier provided by this invention during asphalt mixing and construction, the mass loss of TFOT aging residue in asphalt is significantly reduced, and the content of hydrogen sulfide, sulfur dioxide, nitrogen oxides and VOCs in asphalt fumes is significantly reduced. Detailed Implementation

[0022] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] This invention provides an environmentally friendly asphalt modifier, comprising, by weight percentage:

[0024] Dispersant 20-65%;

[0025] Antioxidant 15-40%;

[0026] Odor reactant 15-40%;

[0027] The odor reactants include one or more of limonene, terpinene, isoterpinene, phellandrene, α-terpinene, pinene, sennayl alcohol, myrtol, verbenaenoyl alcohol, citral, citronellol, hydroxycitronellol, phellandrene, perillaldehyde, menthone, carvone, dihydrocarvone, piperone, camphor, methylnonalan, isopentenal, methylpentylcinnamaldehyde, ethylcinnamaldehyde, α-hexylcinnamaldehyde, 9-decenal, 2-tridecenal, and hexadecenal.

[0028] The asphalt modifier provided by this invention includes a dispersant, an antioxidant, and an odor reactant. Preferably, the dispersant comprises one or more of the following: ethylene glycol butyl ether acetate, diethylene glycol butyl ether acetate, pentaerythritol tetraisooctanoate, pentaerythritol benzoate, pentaerythritol isononanoate, pentaerythritol triacrylate, pentaerythritol tetraisostearate, pentaerythritol tetraacrylate, rosin glyceryl ester, rosin pentaerythritol ester, pentaerythritol oleate, pentaerythritol tetramyristate, neopentyl glycol dioleate, glyceryl monofatty acid ester, ethylene glycol oleate, glyceryl monooctadecanoate, ethylene glycol dimethacrylate, triethylene glycol diisooctanoate, succinimide, bis(succinimide), boronized succinimide, and polyisobutylene succinamide; more preferably, it comprises one or more of the following: succinimide, pentaerythritol oleate, and glyceryl monofatty acid ester. In one embodiment of the present invention, the dispersant is a mixture of succinimide and pentaerythritol oleate, wherein the mass ratio of succinimide to pentaerythritol oleate is preferably 1:(0.5~2), more preferably 1:1; in another embodiment of the present invention, the dispersant is a glycerol monofatty acid ester; in other embodiments of the present invention, the dispersant is a mixture of glycerol monofatty acid ester and succinimide, wherein the mass ratio of glycerol monofatty acid ester to succinimide is preferably 1:(0.5~2), more preferably 1:1.

[0029] In the asphalt modifier provided by the present invention, the content of the dispersant in the asphalt modifier is 20~65wt%, specifically 20wt%, 21wt%, 22wt%, 23wt%, 24wt%, 25wt%, 26wt%, 27wt%, 28wt%, 29wt%, 30wt%, 31wt%, 32wt%, 33wt%, 34wt%, 35wt%, 36wt%, 37wt%, 38wt%, 39wt%, 40wt%, 41wt%, 42wt%, 43wt%, 44wt%, 45wt%, 46wt%, 47wt%, 48wt%, 49wt%, 50wt%, 51wt%, 52wt%, 53wt%, 54wt%, 55wt%, 56wt%, 57wt%, 58wt%, 59wt%, 60wt%, 61wt%, 62wt%, 63wt%, 64wt%, or 65wt%.

[0030] In the asphalt modifier provided by the present invention, the antioxidant preferably includes pentaerythritol dioctadecanyl phosphite (trade name: Antioxidant 618), 2,6-di-tert-butyl-4-methylphenol (trade name: Antioxidant 264), octadecyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate (trade name: Antioxidant 1076), pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] (trade name: Antioxidant 1010), 1 The product contains one or more of 3,5-trimethyl-2,4,6-tris(3,5-tert-butyl-4-hydroxybenzyl)benzene (trade name: Antioxidant 330) and 1,3,5-tris(3,5-di-tert-butyl-4-hydroxybenzyl)isocyanuric acid (trade name: Antioxidant 3114), more preferably including antioxidant 1010 and / or antioxidant 618, wherein the mass ratio of said antioxidant 1010 and antioxidant 618 is preferably 1:(0.5~2), more preferably 1:1.

[0031] In the asphalt modifier provided by the present invention, the antioxidant content in the asphalt modifier is 15~40wt%, specifically 15wt%, 16wt%, 17wt%, 18wt%, 19wt%, 20wt%, 21wt%, 22wt%, 23wt%, 24wt%, 25wt%, 26wt%, 27wt%, 28wt%, 29wt%, 30wt%, 31wt%, 32wt%, 33wt%, 34wt%, 35wt%, 36wt%, 37wt%, 38wt%, 39wt%, or 40wt%.

[0032] In the asphalt modifier provided by the present invention, the odor reactant includes one or more of limonene, terpinene, isoterpinene, phellandrene, α-terpinene, pinene, sennayl alcohol, myrtol, verbenaenoyl alcohol, citral, citronellol, hydroxycitronellol, phellandrene, perillaldehyde, menthone, carvone, dihydrocarvone, piperone, camphor, methyl nonylaldehyde, isopentenal, methylpentylcinnamaldehyde, ethylcinnamaldehyde, α-hexylcinnamaldehyde, 9-decenal, 2-tridecenal, and hexadecenal, preferably including multiples of limonene, terpinene, citral, citronellol, α-hexylcinnamaldehyde, and hexadecenal. In one embodiment of the present invention, the odor reactant is a mixture of limonene, terpinene, and α-hexylcinnamaldehyde, wherein the content of limonene in the mixture is preferably 10-50 wt%, more preferably 25 wt%, the content of terpinene in the mixture is preferably 10-50 wt%, more preferably 25 wt%, and the content of α-hexylcinnamaldehyde in the mixture is preferably 30-70 wt%, more preferably 50 wt%. In another embodiment of the present invention, the odor reactant is a mixture of citral, citronellal, and hexadecenal, wherein the content of citral in the mixture is preferably 10-50 wt%, more preferably 30 wt%, the content of citronellal in the mixture is preferably 10-50 wt%, more preferably 35 wt%, and the content of hexadecenal in the mixture is preferably 10-50 wt%, more preferably 35 wt%. In other embodiments of the present invention, the odor reactant is a mixture of α-hexylcinnamaldehyde and hexadecenal, wherein the mass ratio of α-hexylcinnamaldehyde to hexadecenal is preferably 1:(0.5-2), more preferably 1:1.

[0033] In the asphalt modifier provided by the present invention, the content of the odor reactant in the asphalt modifier is 15~40wt%, specifically 15wt%, 16wt%, 17wt%, 18wt%, 19wt%, 20wt%, 21wt%, 22wt%, 23wt%, 24wt%, 25wt%, 26wt%, 27wt%, 28wt%, 29wt%, 30wt%, 31wt%, 32wt%, 33wt%, 34wt%, 35wt%, 36wt%, 37wt%, 38wt%, 39wt%, or 40wt%.

[0034] This invention also provides a method for preparing the environmentally friendly asphalt modifier described in the above technical solution, comprising the following steps:

[0035] Dispersant, antioxidant and odor reactant are heated and mixed to obtain an environmentally friendly asphalt modifier.

[0036] In the preparation method provided by the present invention, the dispersant, antioxidant and odor reactant are directly heated and mixed evenly in proportion to obtain the environmentally friendly asphalt modifier provided by the present invention. The preferred heating and mixing temperature is 110~150℃, specifically 110℃, 115℃, 120℃, 125℃, 130℃, 135℃, 140℃, 145℃ or 150℃; the preferred heating and mixing speed is 100~500 rpm, specifically 100 rpm, 150 rpm, 200 rpm, 250 rpm, 300 rpm, 350 rpm, 400 rpm, 450 rpm or 500 rpm; the preferred heating and mixing time is 20~90 minutes, specifically 20 minutes, 25 minutes, 30 minutes, 35 minutes, 40 minutes, 45 minutes, 50 minutes, 55 minutes, 60 minutes, 65 minutes, 70 minutes, 75 minutes, 80 minutes, 85 minutes or 90 minutes. In this invention, the heating and mixing process preferably includes: first heating and stirring the dispersant, then adding antioxidants and odor reactants and continuing to stir to obtain an environmentally friendly asphalt modifier.

[0037] This invention optimizes the composition of asphalt modifiers to obtain an asphalt modifier that significantly improves the environmental friendliness of asphalt. It can significantly enhance the aging resistance of asphalt during mixing and construction, and significantly reduce the emission of harmful pollutants. Experimental results show that adding the asphalt modifier provided by this invention during asphalt mixing and construction significantly reduces the mass loss of TFOT aging residues in asphalt, and significantly reduces the content of hydrogen sulfide, sulfur dioxide, nitrogen oxides, and VOCs in asphalt fumes.

[0038] The present invention also provides an environmentally friendly asphalt, comprising the environmentally friendly asphalt modifier and base asphalt described in the above technical solution.

[0039] The environmentally friendly asphalt provided by this invention includes the environmentally friendly asphalt modifier and base asphalt. The base asphalt includes, but is not limited to, ordinary matrix asphalt or modified asphalt; the preferred mass ratio of the environmentally friendly asphalt modifier to the base asphalt is (0.01~0.1):100, specifically 0.01:100, 0.015:100, 0.02:100, 0.025:100, 0.03:100, 0.035:100, 0.04:100, 0.045:100, 0.05:100, 0.055:100, 0.06:100, 0.065:100, 0.07:100, 0.075:100, 0.08:100, 0.085:100, 0.09:100, 0.095:100, or 0.1:100.

[0040] This invention does not particularly limit the preparation method of the provided environmentally friendly asphalt, but preferably involves adding the environmentally friendly asphalt modifier to preheated base asphalt and mixing it evenly. The preheating temperature is preferably 120~160℃, specifically 120℃, 125℃, 130℃, 135℃, 140℃, 145℃, 150℃, 155℃, or 160℃; the mixing speed is preferably 100~500 rpm, specifically 100 rpm, 150 rpm, 200 rpm, 250 rpm, 300 rpm, 350 rpm, 400 rpm, 450 rpm, or 500 rpm; and the mixing time is preferably 20~60 minutes, specifically 20 minutes, 25 minutes, 30 minutes, 35 minutes, 40 minutes, 45 minutes, 50 minutes, 55 minutes, or 60 minutes.

[0041] The environmentally friendly asphalt provided by this invention contains the asphalt modifier provided by this invention, which has good aging resistance during mixing and construction, and emits less harmful pollutants.

[0042] For clarity, the following examples will be used to provide a detailed description.

[0043] Example 1

[0044] An environmentally friendly asphalt modifier is composed of the following raw materials: 45 wt% dispersant, 20 wt% antioxidant, and 35 wt% odor reactant.

[0045] The dispersant consists of 50 wt% succinimide and 50 wt% pentaerythritol oleate.

[0046] The antioxidant is commercially available antioxidant 1010.

[0047] The odor reactant is α-hexylcinnamaldehyde.

[0048] Preparation method of environmentally friendly asphalt modifier: Pentaerythritol oleate and succinimide are added to a mixing vessel, heated to 130℃, and stirred at 300 rpm for 30 minutes; antioxidant 1010 and α-hexylcinnamaldehyde are added, and stirred at 300 rpm for 30 minutes to obtain environmentally friendly asphalt modifier.

[0049] Example 2

[0050] An environmentally friendly asphalt modifier is composed of the following raw materials: 45 wt% dispersant, 20 wt% antioxidant, and 35 wt% odor reactant.

[0051] The dispersant consists of 50 wt% succinimide and 50 wt% pentaerythritol oleate.

[0052] The antioxidant is commercially available antioxidant 1010.

[0053] The odor reactant is limonene.

[0054] Preparation method of environmentally friendly asphalt modifier: Add pentaerythritol oleate and succinimide to a mixing vessel, heat to 130℃, and stir at 300 rpm for 30 minutes; add antioxidant 1010 and limonene, and stir at 300 rpm for 30 minutes to obtain environmentally friendly asphalt modifier.

[0055] Example 3

[0056] An environmentally friendly asphalt modifier is composed of the following raw materials: 45 wt% dispersant, 20 wt% antioxidant, and 35 wt% odor reactant.

[0057] The dispersant consists of 50 wt% succinimide and 50 wt% pentaerythritol oleate.

[0058] The antioxidant is commercially available antioxidant 1010.

[0059] The odor reactant consists of 50 wt% α-hexylcinnamaldehyde, 25 wt% limonene, and 25 wt% terpinene.

[0060] Preparation method of environmentally friendly asphalt modifier: Add pentaerythritol oleate and succinimide to a mixing kettle, heat to 130℃, and stir at 300 rpm for 30 minutes; add antioxidant 1010, α-hexylcinnamaldehyde, limonene, and terpinene, and stir at 300 rpm for 30 minutes to obtain environmentally friendly asphalt modifier.

[0061] Example 4

[0062] An environmentally friendly asphalt modifier is composed of the following raw materials: 40 wt% dispersant, 35 wt% antioxidant, and 25 wt% odor reactant.

[0063] The dispersant is a glycerol monofatty acid ester.

[0064] The antioxidant consists of 50 wt% antioxidant 618 and 50 wt% antioxidant 1010.

[0065] The odor reactant consists of 30 wt% citral, 35 wt% citronellol and 35 wt% hexadecenal.

[0066] Preparation method of environmentally friendly asphalt modifier: Add glycerol monofatty acid ester to a mixing kettle, heat to 130℃, add antioxidant 1010, antioxidant 618, citral, citronellal and hexadecenal, stir at 300 rpm for 30 minutes to obtain environmentally friendly asphalt modifier.

[0067] Example 5

[0068] An environmentally friendly asphalt modifier is composed of the following raw materials: 30 wt% dispersant, 35 wt% antioxidant, and 35 wt% odor reactant.

[0069] The dispersant consists of 50 wt% succinimide and 50 wt% pentaerythritol oleate.

[0070] The antioxidant consists of 50 wt% antioxidant 618 and 50 wt% antioxidant 1010.

[0071] The odor reactant consists of 30 wt% citral, 35 wt% citronellol and 35 wt% hexadecenal.

[0072] Preparation method of environmentally friendly asphalt modifier: Add pentaerythritol oleate and succinimide to a mixing kettle, heat to 130℃, stir at 300 rpm for 30 minutes, add antioxidant 1010, antioxidant 618, citral, citronellal and hexadecenal, stir at 300 rpm for 30 minutes to obtain environmentally friendly asphalt modifier.

[0073] Example 6

[0074] An environmentally friendly asphalt modifier is composed of the following raw materials: 30 wt% dispersant, 35 wt% antioxidant, and 35 wt% odor reactant.

[0075] The dispersant consists of 50 wt% glycerol monofatty acid ester and 50 wt% succinimide.

[0076] The antioxidant consists of 50 wt% antioxidant 618 and 50 wt% antioxidant 1010.

[0077] The odor reactant consists of 50 wt% α-hexylcinnamaldehyde and 50 wt% hexadecenaldehyde.

[0078] Preparation method of environmentally friendly asphalt modifier: Add glycerol monofatty acid ester and succinimide to a mixing kettle, heat to 130℃, stir at 300 rpm for 30 minutes, add antioxidant 1010, antioxidant 618, hexylcinnamaldehyde and hexadecenal, stir at 300 rpm for 30 minutes to obtain environmentally friendly asphalt modifier.

[0079] Performance Evaluation

[0080] The environmentally friendly asphalt modifiers prepared in Examples 1-5 were added to asphalt preheated to 140℃. Specifically, the environmentally friendly asphalt modifiers prepared in Examples 1, 2, and 3 were added at 0.05 wt% of the asphalt mass, and the environmentally friendly asphalt modifiers prepared in Examples 4, 5, and 6 were added at 0.01 wt% of the asphalt mass. After the addition of the environmentally friendly asphalt modifiers, the mixture was stirred at 300 rpm for 30 minutes until homogeneous. The asphalt indicators and asphalt smoke composition were then measured and compared with a blank sample under the same process. The results are shown in Tables 1 and 2.

[0081] Table 1 Technical Specifications of Asphalt

[0082]

[0083] Table 2. Composition Analysis of Asphalt Flue Gas

[0084]

[0085] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. An environmentally friendly asphalt modifier, comprising, by weight percentage, the following components: Dispersant 30-50%; Antioxidant 20-35%; Odor reactant 20-40%; in, The odor reactant is a mixture of citral, citronellal and hexadecenal, or a mixture of α-hexylcinnamaldehyde and hexadecenal; When the odor reactant is a mixture of citral, citronellal, and hexadecenal, the content of citral in the mixture is 10-50 wt%, the content of citronellal in the mixture is 10-50 wt%, and the content of hexadecenal in the mixture is 10-50 wt%. When the odor reactant is a mixture of α-hexylcinnamaldehyde and hexadecenaldehyde, the mass ratio of α-hexylcinnamaldehyde to hexadecenaldehyde is 1:(0.5~2). The antioxidant is selected from one or both of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] and pentaerythritol dioctadecanyl phosphite. When the antioxidant is selected from pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] and pentaerythritol diphosphite bisoctadecyl ester, the mass ratio of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] to pentaerythritol diphosphite bisoctadecyl ester is 1:(0.5~2). The dispersant is selected from one or more of succinimide, pentaerythritol oleate and glycerol monofatty acid ester; When the dispersant is a mixture of succinimide and pentaerythritol oleate, the mass ratio of succinimide to pentaerythritol oleate is 1:(0.5-2); When the dispersant is a mixture of glycerol monofatty acid ester and succinimide, the mass ratio of the glycerol monofatty acid ester to succinimide is 1:(0.5-2).

2. The environmentally friendly asphalt modifier according to claim 1, characterized in that, The dispersant, by mass percentage, consists of the following: 50 wt% succinimide and 50 wt% pentaerythritol oleate.

3. A method for preparing the environmentally friendly asphalt modifier according to any one of claims 1 to 2, comprising the following steps: Dispersant, antioxidant and odor reactant are heated and mixed to obtain an environmentally friendly asphalt modifier.

4. An environmentally friendly asphalt, comprising the environmentally friendly asphalt modifier and base asphalt as described in any one of claims 1 to 2.

5. The environmentally friendly asphalt according to claim 4, characterized in that, The mass ratio of the environmentally friendly asphalt modifier to the base asphalt is (0.01~0.1):100.

Images