An asphalt fume suppressant, an asphalt composition, and a method for preparing the same

Abstract

The application discloses an asphalt fume inhibitor, an asphalt composition and a preparation method thereof. The asphalt fume inhibitor comprises the following components in parts by weight: 100 parts of a polymer modifier, 2-13 parts of a nitrogen-containing heterocyclic alkaloid, 2-9 parts of a halogenated alkenyl alcohol compound and 5-20 parts of an extracted oil. The asphalt fume inhibitor has good compatibility with asphalt, and physical migration and volatilization of the fume inhibitor do not occur; the asphalt fume inhibitor can improve the anti-aging performance of asphalt and preventively reduce the fume release amount of asphalt in the production and construction process.

Description

Technical Field

[0001] This invention belongs to the field of environmentally friendly road surface applications, specifically relating to an asphalt fume inhibitor, an asphalt composition, and a method for preparing the same. Background Technology

[0002] With the accelerating pace of urban modernization, urban roads, a central component of municipal construction, are constantly expanding. Asphalt pavement, a major type of municipal road, faces increasingly stringent environmental requirements in its production and application. Currently, asphalt pavement construction typically employs a hot-mix, hot-lay process, which releases asphalt fumes under high-temperature conditions. Asphalt fumes are a unique pollutant, primarily composed of liquid hydrocarbon particles and gaseous hydrocarbons and their derivatives. The polycyclic aromatic hydrocarbons they contain are highly hazardous, causing environmental pollution and harming the health of construction workers. The volatilization of asphalt fumes also affects the internal structure of asphalt, leading to deterioration in road performance, decreased anti-aging properties, brittleness, and reduced adhesion to aggregates, ultimately directly impacting the pavement's service life. Therefore, minimizing asphalt fumes release and achieving clean asphalt pavement construction while ensuring road performance will be crucial for the future development of transportation.

[0003] To overcome this problem, those skilled in the art have developed various asphalt fume suppressant additives, but the effects are mostly unsatisfactory. Current cutting-edge technology aims to reduce fume emissions by adding additives to asphalt, which react chemically with light components to generate macromolecular compounds that remain in the asphalt. CN109749466A discloses a smoke suppressant and odor deodorizer additive, its preparation method, and modified asphalt. In addition to using reactive odor suppressants, it also utilizes metal-organic frameworks and inorganic porous adsorbent materials to increase the adsorption of polycyclic aromatic hydrocarbons and volatile organic compounds, thereby reducing the overall emission of asphalt fumes. However, the physical and chemical properties of metal and inorganic materials differ significantly from those of petroleum asphalt, resulting in poor compatibility and easy phase separation when directly mixed. The reactive additives or deodorizers disclosed in CN101842426A, CN108276783A, EP2185640B1, and US8425678B2 that suppress or reduce the high-temperature odor of asphalt involve many aldehydes or aldehyde-ketone combinations. However, these additives capture small molecules in asphalt fumes, which means that the threshold for capturing fumes is limited, and the fumes suppression effect is limited.

[0004] In summary, existing smoke suppression technologies have varying degrees of shortcomings in addressing the problem of asphalt fume release. Most of them involve smoke suppression measures after asphalt fumes are generated, failing to preventively reduce the release of asphalt fumes. Therefore, there is an urgent need to develop new low-smoke asphalt products to reduce the generation and release of asphalt fumes at the source. Summary of the Invention

[0005] To address the shortcomings and defects of existing technologies, this invention provides an asphalt fume inhibitor, an asphalt composition, and a method for preparing the same. This asphalt fume inhibitor exhibits excellent compatibility with asphalt, preventing physical migration and volatilization of the inhibitor. While improving the anti-aging properties of asphalt, it can preventively reduce the amount of fume released during asphalt production and construction.

[0006] The first aspect of this invention provides an asphalt fume inhibitor, comprising, by weight, the following components:

[0007]

[0008] Furthermore, the polymer modifier is one or more of styrene-butadiene-styrene block copolymer, styrene-butadiene rubber, and polyethylene resin.

[0009] Furthermore, the styrene-butadiene-styrene block copolymer is linear and / or star-shaped, and the average relative molecular mass of the styrene-butadiene-styrene block copolymer is 110,000 to 250,000.

[0010] Furthermore, the styrene-butadiene rubber has a styrene content of 25wt% to 45wt%; preferably, the particle size of the styrene-butadiene rubber is not greater than 20mm.

[0011] Furthermore, the polyethylene resin is one or more of low-density polyethylene resin, medium-density polyethylene resin, and high-density polyethylene resin.

[0012] Furthermore, the nitrogen-containing heterocyclic alkaloid is one or more of the following: sodium 3'-bromo-indophenol, tetrahydroberberine, norcodonine, magnoline, 2,3,5,6-tetramethylpyrazine, berberine, and purslane.

[0013] Further, the haloenol compound is one or more of 2-bromo-3-buten-2-ol, 3-chloro-2-buten-1-ol, 1-iodo-2-propen-3-ol, 4-bromo-2-penten-4-ol, 2-fluoro-3-hexen-1-ol, and 1,1-dichloro-2-buten-3-ol.

[0014] Furthermore, the extracted oil is a refined lubricating oil, including one or more of the following: reduced-line extracted oil, reduced-line extracted oil, reduced-line extracted oil, and reduced-line extracted oil.

[0015] A second aspect of the present invention provides a method for preparing the above-mentioned asphalt fume inhibitor, comprising:

[0016] (1) Mix the nitrogen-containing heterocyclic alkaloids with the solvent and stir;

[0017] (2) Mix the haloenol compound with the mixture obtained in step (1) and stir;

[0018] (3) Wash, separate and purify the mixture obtained in step (2);

[0019] (4) The material obtained in step (3) is mixed with polymer modifier and extracted oil, and then granulated to obtain asphalt fume inhibitor.

[0020] Further, in step (1), the solvent is one or more of dichloromethane, trichloromethane, and carbon tetrachloride.

[0021] Further, in step (1), the mass ratio of the nitrogen-containing heterocyclic alkaloid to the solvent is 1:(2-5).

[0022] Further, in step (1), the stirring speed is 200-400 r / min, the stirring time is 20-40 min, and the stirring temperature is 15-35℃.

[0023] Furthermore, in step (2), the stirring speed is 200-400 r / min, the stirring time is 20-90 min, and the stirring temperature is 15-35℃.

[0024] Furthermore, in step (2), it is preferable to slowly add the haloenol compound dropwise to the mixture obtained in step (1) and mix them.

[0025] Further, in step (3), the mixture obtained in step (2) is poured into a separatory funnel and washed with deionized water.

[0026] Furthermore, in step (3), the product is purified by column chromatography.

[0027] Furthermore, in step (4), the mixing can be performed using conventional mixing equipment in the art, such as a kneader. The mixing temperature is 155℃~175℃, and the mixing time is 45~75min.

[0028] Furthermore, in step (4), the granulation is achieved using a conventional extrusion granulation device, such as a screw extruder. The extrusion granulation temperature is 155℃~175℃. Preferably, after granulation, the particle size of the asphalt fume inhibitor is 2~5mm.

[0029] A third aspect of the present invention provides an asphalt composition comprising, by weight, the following components:

[0030] 100 parts of petroleum asphalt;

[0031] 2-4 parts of the above-mentioned asphalt fume inhibitor.

[0032] Furthermore, the petroleum asphalt is one or more of straight-run asphalt, oxidized asphalt, solvent-deasphalted asphalt, and natural asphalt; the softening point of the petroleum asphalt is 40–80°C.

[0033] A fourth aspect of the present invention provides a method for preparing the above-mentioned asphalt composition, comprising:

[0034] The petroleum asphalt is heated to a molten state, the asphalt fume inhibitor is added, and the mixture is stirred to obtain an asphalt composition.

[0035] Preferably, the petroleum asphalt is heated to a melting temperature of 145℃ to 160℃, the stirring temperature is 145℃ to 160℃, the stirring speed is 200 to 400 r / min, and the stirring time is 20 to 40 min.

[0036] Compared with the prior art, the present invention has the following beneficial effects:

[0037] (1) The asphalt fume inhibitor of this invention, through the synergistic effect of its various components, can significantly reduce the amount of fume released during asphalt production and construction, and improve the asphalt's anti-aging properties. The nitrogen heterocyclic alkaloids therein react with singlet oxygen... 1 O2 gains energy through collisions, 1 O2 is deactivated and converted into ground-state oxygen atoms. 3 O2 reduces the probability of alkyl free radicals combining with oxygen to form alkyl peroxides, thereby inhibiting the generation of free radicals and preventing the emission of asphalt fumes during production and construction. Additionally, haloenol compounds, through nucleophilic substitution reactions, replace groups on the nitrogen atoms of alkaloids, increasing the electron density on the nitrogen atoms. This facilitates the nitrogen atoms in the heterocycles to approach and react with reactive oxygen species, and they can effectively reduce alkyl peroxides, thus inhibiting oxidation reactions. This effectively suppresses the aging process of asphalt under photothermal conditions and preventively reduces the emission of asphalt fumes during production and construction.

[0038] (2) The asphalt fume inhibitor of the present invention has good compatibility with asphalt, avoiding the physical migration and volatilization problems caused by adding asphalt fume inhibitor. In addition, it is relatively stable and does not require special storage and is easy to transport and store. Detailed Implementation

[0039] The present invention will be further described below with reference to embodiments, but it should be understood that the scope of protection of the present invention is not limited to the embodiments. Furthermore, unless otherwise specified, all percentages involved in the present invention are mass percentages.

[0040] The asphalt fumes referred to in this invention are the sum of liquid particulate matter larger than 3μm enriched in polypropylene fiber cotton and gaseous components absorbed by cyclohexane in the asphalt fumes. The asphalt additives involved in this invention are additives capable of reducing the total amount of liquid particulate matter larger than 3μm and gaseous components absorbed by cyclohexane.

[0041] In this invention, the experimental method for determining the total amount of asphalt fumes in the examples and comparative examples is as follows: a polypropylene fiber filter bottle and a cyclohexane receiving bottle are used in combination to simultaneously enrich liquid and gaseous asphalt fumes. 1000±5g of asphalt sample is added to the vessel of the asphalt fumes generating device, and asphalt fumes are prepared at 163℃, a space velocity (nitrogen) of 5L / h, and a constant stirring rate of 400r / min. The polypropylene fiber filter bottle mainly enriches liquid particulate matter larger than 3μm in the asphalt fumes, which belongs to the heavy components of asphalt fumes. The cyclohexane receiving bottle enriches the gaseous components in the asphalt fumes, which belong to the light components of asphalt fumes. To ensure complete enrichment of the light components in the asphalt fumes, two receiving bottles connected in series are used in the experiment.

[0042] In this invention, the residual penetration ratio is measured according to T0604-2000 of the Test Procedure for Asphalt and Asphalt Mixtures in Highway Engineering JTJ 052-2000. The thin-film oven test is measured according to T0609-1993 of the Test Procedure for Asphalt and Asphalt Mixtures in Highway Engineering JTJ 052-2000. Specifically, 50±0.5g of asphalt sample is weighed and placed in a sample dish to form a thin film of uniform asphalt thickness. The dish is then placed in a standard oven at 163℃ and heated for 5 hours, and the change in the asphalt penetration ratio is measured.

[0043] Example 1

[0044] (1) Weigh 3 parts by weight of sodium 3'-bromo-indophenol and dissolve it in 12 parts by weight of dichloromethane solvent. Stir for 20 min at 20°C and 200 r / min to prepare mixture A1.

[0045] (2) Weigh 8 parts by weight of 2-bromo-3-buten-2-ol, slowly add it dropwise to mixture A1, and stir for 20 min at 20℃ and 200 r / min to prepare mixture A2.

[0046] (3) After the reaction is complete, pour the mixture A2 into a separatory funnel, wash the organic layer three times with deionized water, perform separation, and purify the product by column chromatography to obtain purified product A3.

[0047] (4) The purified product A3 was mixed with 100 parts by weight of linear styrene-butadiene-styrene copolymer with an average relative molecular mass of 110,000 and 10 parts by weight of reduced-density linear extract oil in a kneader. The mixing temperature was 156°C and the mixing time was 46 min. Finally, the product was granulated by a screw extruder at an extrusion temperature of 170°C. The product was cut into granules with a particle size of 2 mm to obtain asphalt fume inhibitor.

[0048] 100 parts by weight of oxidized asphalt (softening point 60.5℃) was heated to a molten state at 150℃. 2 parts by weight of the above-mentioned asphalt fume inhibitor were added to the asphalt, and the mixture was heated to 150℃ and stirred at 300 r / min for 40 min to obtain the asphalt composition.

[0049] Example 2

[0050] (1) Weigh 6 parts by weight of tetrahydroberberine and dissolve it in 12 parts by weight of chloroform solvent. Stir for 40 min at 35°C and 400 r / min to prepare mixture B1.

[0051] (2) Weigh 4 parts by weight of 3-chloro-2-buten-1-ol, slowly add it dropwise to mixture B1, and stir for 90 min at 35°C and 400 r / min to prepare mixture B2.

[0052] (3) After the reaction is complete, pour the mixture B2 into a separatory funnel, wash the organic layer three times with deionized water, perform separation, and purify the product by column chromatography to obtain purified product B3.

[0053] (4) The purified product B3 was mixed with 100 parts by weight of styrene-butadiene rubber (styrene content 25wt%, particle size 6-14mm) and 8 parts by weight of reduced-density four-line extract oil in a kneader. The mixing temperature was 175℃ and the mixing time was 75min. Finally, the mixture was granulated by a screw extruder at an extrusion temperature of 155℃. The granules with a particle size of 5mm were cut to obtain asphalt fume inhibitor.

[0054] 100 parts by weight of straight-run asphalt (softening point 47.2℃) was heated to a molten state at 160℃. 4 parts by weight of the above-mentioned asphalt fume inhibitor were added to the asphalt, and the mixture was heated to 160℃ and stirred at 400 r / min for 20 min to obtain the asphalt composition.

[0055] Example 3

[0056] (1) Weigh 4 parts by weight of norcodonine and dissolve it in 12 parts by weight of carbon tetrachloride solvent. Stir for 30 min at 25°C and 300 r / min to prepare mixture C1.

[0057] (2) Weigh 6 parts by weight of 1-iodo-2-propen-3-ol, slowly add it dropwise to mixture C1, and stir for 55 min at 25℃ and 300 r / min to prepare solution mixture C2.

[0058] (3) After the reaction is complete, the solution mixture C2 is poured into a separatory funnel, the organic layer is washed three times with deionized water, the mixture is separated, and the product is purified by column chromatography to obtain purified product C3.

[0059] (4) The purified product C3 was mixed with 100 parts by weight of star-shaped styrene-butadiene-styrene copolymer with an average relative molecular mass of 200,000 and 12 parts by weight of reduced-diene extract oil in a kneader. The mixing temperature was 165°C and the mixing time was 60 min. Finally, the mixture was granulated by a screw extruder at an extrusion temperature of 165°C. The granules were cut into particles with a particle size of 2.5 mm to obtain asphalt fume inhibitor.

[0060] At 153°C, 100 parts by weight of solvent deasphalting agent (softening point 70.5°C) was heated to a molten state. The above-mentioned 3 parts by weight of asphalt fume inhibitor were added to the asphalt, heated to 152°C, and stirred at 300 r / min for 30 min to obtain the asphalt composition.

[0061] Example 4

[0062] (1) Weigh 3.5 parts by weight of 2,3,5,6-tetramethylpyrazine and dissolve it in 7 parts by weight of carbon dichloride solvent. Stir for 30 min at 25°C and 300 r / min to prepare mixture D1.

[0063] (2) Weigh 6 parts by weight of 2-fluoro-3-hexen-1-ol, slowly add it dropwise to mixture D1, and stir for 55 min at 25℃ and 300 r / min to prepare mixture D2.

[0064] (3) After the reaction is complete, the mixture D2 is poured into a separatory funnel, the organic layer is washed three times with deionized water, the mixture is separated, and the product is purified by column chromatography to obtain purified product D3.

[0065] (4) The purified product D3 was mixed with 100 parts by weight of medium-density polyethylene resin and 16 parts by weight of reduced-density polyethylene oil in a kneader. The mixing temperature was 165°C and the mixing time was 60 min. Finally, the mixture was granulated by a screw extruder at a temperature of 165°C. The granules were cut into particles with a particle size of 2.5 mm to obtain asphalt fume inhibitor.

[0066] 100 parts by weight of natural asphalt (softening point 60.5℃) was heated to a molten state at 153℃. The above-mentioned 3 parts by weight of asphalt fume inhibitor were added to the asphalt, heated to 152℃, and stirred at 300 r / min for 30 min to obtain an asphalt composition.

[0067] Example 5

[0068] (1) Weigh 5 parts by weight of magnolol and dissolve it in 10 parts by weight of carbon tetrachloride solvent. Stir for 30 minutes at 25°C and 300 r / min to prepare mixture E1.

[0069] (2) Weigh 5 parts by weight of 1,1-dichloro-2-buten-3-ol and slowly add it dropwise to mixture E1. Then, continue stirring for 55 min at 25°C and 300 r / min to prepare mixture E2.

[0070] (3) After the reaction is complete, the mixture E2 is poured into a separatory funnel, the organic layer is washed three times with deionized water, the mixture is separated, and the product is purified by column chromatography to obtain purified product E3.

[0071] (4) The purified product E3 was mixed with 100 parts by weight of star-shaped styrene-butadiene-styrene copolymer with an average relative molecular mass of 130,000 and 14 parts by weight of reduced three-line extract oil in a kneader for mixing at a temperature of 165°C for 60 min. Finally, the mixture was granulated by a screw extruder at a temperature of 165°C and cut into granules with a particle size of 2.5 mm to obtain asphalt fume inhibitor.

[0072] 100 parts by weight of straight-run asphalt (softening point 47.2℃) was heated to a molten state at 153℃. The above-mentioned 3 parts by weight of asphalt fume inhibitor were added to the asphalt, heated to 152℃, and stirred at 300 r / min for 30 min to obtain the asphalt composition.

[0073] Comparative Example 1

[0074] Compared with Example 3, the only difference is that the 4 parts by weight of norcodonine are not added in step (1).

[0075] Comparative Example 2

[0076] Compared with Example 3, the only difference is that the 6 parts by weight of 1-iodo-2-propen-3-ol are not added in step (2).

[0077] Comparative Example 3

[0078] Compared with Example 3, the only difference is that the 4 parts by weight of norcodonine in step (1) are replaced with the same weight of sodium ethoxide.

[0079] Comparative Example 4

[0080] Compared with Example 3, the only difference is that the 6 parts by weight of 1-iodo-2-propen-3-ol in step (2) are replaced with the same weight of 2-methyl-2-propanol.

[0081] The flue gas collection experiment and the thin film drying oven test were carried out on the asphalt composition prepared above, and the residual penetration ratio was measured. The results are shown in Table 1.

[0082] Table 1. Test results of total asphalt fume volume and residual penetration ratio

[0083]

[0084] As shown in Table 1, the asphalt fume inhibitor of the present invention can improve the anti-aging properties of asphalt binder and significantly reduce the amount of fume released when asphalt is heated.

Claims

1. An asphalt fume inhibitor, characterized in that, The asphalt fume inhibitor comprises the following components by weight:

2. The asphalt fume inhibitor according to claim 1, characterized in that, The polymer modifier is one or more of styrene-butadiene-styrene block copolymer, styrene-butadiene rubber, and polyethylene resin; Preferably, the styrene-butadiene-styrene block copolymer is linear and / or star-shaped, and the average relative molecular mass of the styrene-butadiene-styrene block copolymer is 110,000 to 250,000. And / or, the styrene-butadiene rubber has a styrene content of 25wt% to 45wt%; the particle size of the styrene-butadiene rubber is not greater than 20mm; And / or, the polyethylene resin is one or more of low-density polyethylene resin, medium-density polyethylene resin, and high-density polyethylene resin.

3. The asphalt fume inhibitor according to claim 1, characterized in that, The nitrogen-containing heterocyclic alkaloid is one or more of the following: sodium 3'-bromo-indophenol, tetrahydroberberine, norcodonine, magnoline, 2,3,5,6-tetramethylpyrazine, berberine, and purslane.

4. The asphalt fume inhibitor according to claim 1, characterized in that, The haloenol compound is one or more of 2-bromo-3-buten-2-ol, 3-chloro-2-buten-1-ol, 1-iodo-2-propen-3-ol, 4-bromo-2-penten-4-ol, 2-fluoro-3-hexen-1-ol, and 1,1-dichloro-2-buten-3-ol.

5. The asphalt fume inhibitor according to claim 1, characterized in that, The extracted oil is a refined lubricating oil, including one or more of the following: reduced-line extracted oil, reduced-line extracted oil, reduced-line extracted oil, and reduced-line extracted oil.

6. A method for preparing the asphalt fume inhibitor according to any one of claims 1-5, comprising: (1) Mix the nitrogen-containing heterocyclic alkaloids with the solvent and stir; (2) Mix the haloenol compound with the mixture obtained in step (1) and stir; (3) Wash, separate and purify the mixture obtained in step (2); (4) The material obtained in step (3) is mixed with polymer modifier and extracted oil, and then granulated to obtain asphalt fume inhibitor.

7. The method according to claim 6, characterized in that, In step (1), the solvent is one or more of dichloromethane, trichloromethane, and carbon tetrachloride; And / or, in step (1), the mass ratio of the nitrogen-containing heterocyclic alkaloid to the solvent is 1:(2-5).

8. The method according to claim 6, characterized in that, In step (1), the stirring speed is 200-400 r / min, the stirring time is 20-40 min, and the stirring temperature is 15-35℃. And / or, in step (2), the stirring speed is 200-400 r / min, the stirring time is 20-90 min, and the stirring temperature is 15-35℃.

9. The method according to claim 6, characterized in that, In step (4), the mixing temperature is 155℃~175℃ and the mixing time is 45~75min; And / or, the extrusion granulation temperature is 155℃~175℃; the particle size of the asphalt fume inhibitor is 2~5mm.

10. An asphalt composition, comprising, by weight, the following components: 100 parts of petroleum asphalt; Two to four parts of the asphalt fume inhibitor according to any one of claims 1-5.

11. The bitumen composition according to claim 10, characterized in that, The petroleum asphalt is one or more of straight-run asphalt, oxidized asphalt, solvent-deasphalted asphalt, and natural asphalt, and its softening point is 40-80℃.

12. A method for preparing the asphalt composition according to claim 10 or 11, comprising: The petroleum asphalt is heated to a molten state, the asphalt fume inhibitor is added, and the mixture is stirred to obtain an asphalt composition.

13. The method according to claim 12, characterized in that, The petroleum asphalt is heated to a melting temperature of 145℃~160℃, the stirring temperature is 145℃~160℃, the stirring speed is 200~400r / min, and the stirring time is 20~40min.

Images