Wheel-sticking-free emulsified asphalt as well as preparation method and application thereof

Abstract

The invention provides wheel-sticking-free emulsified asphalt as well as a preparation method and application thereof. The wheel-sticking-free emulsified asphalt comprises modified asphalt and liquid soap in a weight ratio of (40-65): (29.3-56), the modified asphalt comprises 40-60 parts by weight of matrix asphalt and 0-5 parts by weight of a polymer modifier, and the liquid soap comprises 0.3-3 parts by weight of an asphalt emulsifier, 0-5 parts by weight of a nano additive, 27-32 parts by weight of water, 1-10 parts by weight of a toughening agent and 1-6 parts by weight of an elastomer modifier acid-base regulator; the addition amount of the acid-base regulator is based on the standard that the pH value of the liquid soap is regulated to 2.0-4.0. The preparation method comprises the following steps: preparing modified asphalt, preparing liquid soap and preparing the non-sticking emulsified asphalt. The non-sticking wheel emulsified asphalt is used for bonding layers between asphalt concrete layers and between cement concrete and asphalt concrete layers, the demulsification speed is increased, and the non-sticking wheel performance of the emulsified asphalt is improved.

Description

Technical Field

[0001] The present application relates to the technical field of road materials, and in particular to a non-stick wheel emulsified asphalt, a preparation method and application thereof. Background Art

[0002] During the construction and maintenance of highway projects, whether between asphalt concrete layers or between cement concrete and asphalt concrete layers, a process of spreading tack coat materials is usually adopted so that the upper and lower layers can be tightly connected to form a whole, so that the layers can be stressed as a whole, reducing the dislocation and translation of the interlayer structure caused by traffic loads, and improving the durability of the road surface. However, in the actual construction process, an important reason for the poor interlayer bonding effect is that the existing tack coat emulsified asphalt, after being spread, will usually adhere to the wheels of construction vehicles such as transport vehicles and pavers, even if it has been completely demulsified and formed into a film, and thus be taken away, resulting in the loss of tack coat materials near the wheel track, thereby causing hidden dangers of road surface diseases.

[0003] In view of the problems existing in the above-mentioned existing tack coat emulsified asphalt, such as easy to stick to wheels and insufficient bonding strength, the object of the present invention is to provide a tack coat emulsified asphalt that does not stick to wheels and has improved bonding strength. Summary of the invention

[0004] The present application provides a non-stick wheel emulsified asphalt, a preparation method and application thereof, to solve the above-mentioned problems mentioned in the background technology.

[0005] The present application provides a non-stick wheel emulsified asphalt, which includes modified asphalt and soap solution in a weight ratio of (40-65):(29.3-56);

[0006] The modified asphalt comprises: 40-60 parts by weight of base asphalt and 0-5 parts by weight of polymer modifier, and the soap solution comprises: 0.3-3 parts by weight of asphalt emulsifier, 0-5 parts by weight of nano additive, 27-32 parts by weight of water, 1-10 parts by weight of toughening agent, 1-6 parts by weight of elastomer modifier and acid-base regulator;

[0007] The amount of acid-base regulator added is based on adjusting the pH value of the soap solution to 2.0-4.0.

[0008] Optionally, the base asphalt is 70# base asphalt or 90# base asphalt.

[0009] Optionally, the asphalt emulsifier is selected from at least one of a cationic asphalt emulsifier and a non-ionic asphalt emulsifier.

[0010] Optionally, the polymer modifier is selected from at least one of polybutadiene latex and styrene-butadiene latex.

[0011] Optionally, the nano additive is one or more of organic bentonite, graphite, graphene, nanocellulose fiber, and carbon nanotube.

[0012] Optionally, the non-stick wheel emulsified asphalt is characterized in that the toughening agent is selected from A-C629 of the Honeywell wax series.

[0013] Optionally, the elastomer modifier is polydimethylsiloxane.

[0014] Optionally, the acid-base regulator is selected from an acid solution with a concentration of 0.5-1.0 mol / L.

[0015] On the other hand, the present application provides a method for preparing a non-stick wheel emulsified asphalt, the preparation method is used to prepare the above-mentioned non-stick wheel emulsified asphalt, and the preparation method comprises the following steps:

[0016] (1) heating the base asphalt and the polymer modifier to 150-160° C. under stirring according to weight, maintaining the temperature, and continuing stirring for 4-6 hours to obtain modified asphalt;

[0017] (2) heating water to 40-80° C. to obtain hot water, adding an asphalt emulsifier, a nano-additive, a toughening agent, and an elastomer modifier to the hot water to obtain a mixed solution, and adding an acid-base regulator to the mixed solution until the pH value is 2.0-4.0 to obtain a soap solution;

[0018] (3) The modified asphalt and soap solution are subjected to high-speed shearing to obtain non-stick wheel emulsified asphalt.

[0019] On the other hand, the present application provides a non-stick wheel emulsified asphalt for use as a bonding layer between asphalt concrete layers, and between cement concrete and asphalt concrete layers during the construction or maintenance of roads, bridges, tunnels, etc. The non-stick wheel emulsified asphalt is the non-stick wheel emulsified asphalt mentioned above, or the non-stick wheel emulsified asphalt prepared by the above method.

[0020] The non-stick wheel emulsified asphalt, preparation method and application thereof provided in the present application realize the preparation of non-stick wheel emulsified asphalt, and have the following beneficial effects compared with the prior art:

[0021] (1) Modify the base asphalt with a polymer modifier to improve the stability, load and high temperature stability of the asphalt, and at the same time improve the adhesion performance of the asphalt. By mixing the asphalt emulsifier, nano additives, water, toughening agent and elastomer modifier, and adjusting the pH value with an acid-base regulator to form a soap solution, the surface tension of the asphalt is significantly reduced, thereby forming a stable emulsified mixture. The asphalt can be evenly attached to the road surface, increasing the durability and service life of the road. The asphalt emulsifier wraps the modified asphalt molecules in it and forms a stable emulsion with water. After being laid on the road surface, it evaporates in the water phase. The asphalt emulsifier molecules will combine with the modified asphalt particle molecules to form a protective film, so that the emulsified asphalt will not stick to the construction equipment, improving the non-stick wheel performance. By adjusting the pH value to 2.0-4.0, the ionization balance of the asphalt emulsifier can be maintained, the double electron layer potential of the water-emulsified asphalt system is improved, the asphalt is not easy to collide and precipitate, the stability of the system is improved, and the stability of the emulsified asphalt can be improved. By compounding and mixing the components in a special ratio, the components interact with each other, which increases the demulsification rate of the emulsified asphalt, thereby facilitating on-site construction and improving the fault tolerance rate of on-site construction.

[0022] (2) During the preparation process, the soap solution temperature is controlled at 40-80°C to avoid the soap solution temperature being too low, which will lead to incomplete emulsification and affect the quality of the emulsified asphalt; or the temperature being too high, which will cause the emulsified asphalt to precipitate or stratify during storage, thereby ensuring the stability of the emulsified asphalt system, or the temperature being too high, which will cause demulsification, thereby enhancing the non-stick wheel performance.

[0023] (3) By adding 4-bromo-3-nitrophenol and 2,6-dimethyl-3-methoxyphenylboronic acid, when the modified asphalt is dispersed in the soap solution, the phenolic hydroxyl group in 4-bromo-3-nitrophenol can interact with the asphalt emulsifier, thereby improving the dispersion stability of the emulsified asphalt in the soap solution. At the same time, when the emulsified asphalt is paved on the road surface and demulsified, the benzene ring in 4-bromo-3-nitrophenol combines with the emulsifier to form a three-dimensional network structure inside, thereby improving the adhesion and stability of the asphalt. At the same time, the boron and active groups on 2,6-dimethyl-3-methoxyphenylboronic acid can combine with the asphalt surface, while changing the double electron layer potential balance of the water-emulsified asphalt system, so that the combination between the asphalt and the asphalt emulsifier becomes weaker or disconnected, thereby achieving the purpose of accelerating demulsification and improving the non-stick wheel performance of the emulsified asphalt.

[0024] (4) The non-stick wheel emulsified asphalt provided in the present application has excellent non-stick wheel performance at 70°C±2°C, and has a fast demulsification speed, and does not need to be spread in advance, making construction more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0026] Figure 1 A schematic diagram of the demulsification time of the non-stick wheel emulsified asphalt provided in Examples 1 to 3, Comparative Example 1, and Comparative Example 2 of the present application;

[0027] Figure 2 Schematic diagram of demulsification time of non-stick wheel emulsified asphalt provided in Examples 4 to 6, Comparative Example 3 and Comparative Example 4 of the present application. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application is clearly and completely described below. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work also fall within the scope of protection of the present application.

[0029] The present application provides a non-stick wheel emulsified asphalt, which includes modified asphalt and soap solution in a weight ratio of (40-65):(29.3-56);

[0030] The modified asphalt comprises: 40-60 parts by weight of base asphalt and 0-5 parts by weight of polymer modifier, and the soap solution comprises: 0.3-3 parts by weight of asphalt emulsifier, 0-5 parts by weight of nano additive, 27-32 parts by weight of water, 1-10 parts by weight of toughening agent, 1-6 parts by weight of elastomer modifier and acid-base regulator;

[0031] The amount of acid-base regulator added is based on adjusting the pH value of the soap solution to 2.0-4.0.

[0032] Specifically, the non-stick wheel emulsified asphalt includes modified asphalt and soap solution. The base asphalt is modified by a polymer modifier, which can significantly improve the stability of the asphalt, so that the modified asphalt has a higher load and high temperature stability, and can also improve the adhesion and shear resistance of the asphalt, thereby enhancing its stability. And through polymer modification, the modified asphalt has strong bonding ability, reduces cracks, and has good aging resistance and durability. The role of soap solution in the non-stick wheel emulsified asphalt mainly includes reducing the surface tension of asphalt, improving the emulsification effect and improving the construction performance. Soap solution can significantly reduce the surface tension of asphalt, so that the modified asphalt and water are better mixed, thereby forming a stable emulsified mixture. It can make the asphalt evenly adhere to the road surface, improve the flatness and glossiness of the road, and increase the durability and service life of the road.

[0033] The addition of asphalt emulsifiers enhances the hydrophilicity of the asphalt surface and can reduce the surface tension between asphalt and water. At the same time, the asphalt emulsifier interacts with the modified asphalt molecules to form a micelle-like structure, which wraps the modified asphalt molecules, making asphalt and water more compatible and fully mixed to form a stable emulsion. The emulsifier can also form a molecular film to wrap the asphalt particles to prevent them from re-aggregating. After the emulsified asphalt is laid on the road surface, it is demulsified to improve the adhesion and stability of the asphalt. At the same time, after the water phase evaporates, the asphalt emulsifier molecules will combine with the modified asphalt particle molecules to form a protective film, so that the emulsified asphalt will not stick to the construction equipment.

[0034] Nano additives act as emulsifiers and modifiers through the Pickering emulsion mechanism to increase the stability of the emulsion, prevent the emulsion from stratification and precipitation during storage and use, significantly improve the stability and non-stick performance of emulsified asphalt, and further accelerate the demulsification speed. Nano additives can also improve the high temperature stability and anti-aging ability of emulsified asphalt.

[0035] While the toughening agent enhances the adhesion of emulsified asphalt, it also forms an isolation film on the surface of the emulsified asphalt, thereby further improving the non-stick wheel performance of the emulsified asphalt. The addition of the elastomer modifier improves the low-temperature ductility and construction damage resistance of the asphalt, and can enhance the toughness of the emulsified asphalt, improve the crack resistance and adhesion performance.

[0036] The pH value of the soap solution is adjusted to 2.0-4.0 by an acid-base regulator to improve the stability of the emulsified asphalt. After the asphalt emulsifier is dispersed in water, it dissociates and its hydrophilic group is adsorbed on the asphalt, so that the asphalt droplets have a positive charge, forming a diffuse double potential at the asphalt-water interface, making the water-emulsified asphalt system more stable. At the same time, the pH value is adjusted to 2.0-4.0, which can maintain the ionization balance of the asphalt emulsifier, improve the double electron layer potential of the water-emulsified asphalt system, make the asphalt less likely to collide and precipitate, improve the stability of the system, and thus improve the stability of the emulsified asphalt. At the same time, by compounding and mixing the components in a special ratio, the components interact with each other, which increases the demulsification speed of the emulsified asphalt, thereby facilitating on-site construction and improving the fault tolerance rate of on-site construction.

[0037] The base asphalt is modified by polymer modifiers to improve the stability of asphalt, so that the modified asphalt has higher load and high temperature stability, and at the same time improves the adhesion performance of asphalt. By mixing asphalt emulsifier, nano additives, water, toughening agent and elastomer modifier, and adjusting the pH value by acid-base regulator, soap solution is formed, which significantly reduces the surface tension of asphalt, so that the modified asphalt and water are better mixed to form a stable emulsified mixture. It can make asphalt adhere evenly to the road surface, improve the flatness and glossiness of the road, and increase the durability and service life of the road. The asphalt emulsifier wraps the modified asphalt molecules in it and forms a stable emulsion with water. After being laid on the road surface, it evaporates in the water phase. The asphalt emulsifier molecules will combine with the modified asphalt particle molecules to form a protective film, so that the emulsified asphalt will not stick to the construction equipment, improving the non-stick wheel performance. By adjusting the pH value to 2.0-4.0, the ionization balance of the asphalt emulsifier can be maintained, the double electron layer potential of the water-emulsified asphalt system is improved, the asphalt is not easy to collide and precipitate, the stability of the system is improved, and the stability of the emulsified asphalt can be improved. By compounding and mixing the components in a special ratio, the components interact with each other, the demulsification speed of the emulsified asphalt is increased, which is convenient for on-site construction and improves the fault tolerance rate of on-site construction.

[0038] Optionally, the base asphalt is 70# base asphalt or 90# base asphalt.

[0039] Optionally, the asphalt emulsifier is selected from at least one of a cationic asphalt emulsifier and a nonionic asphalt emulsifier. Further, the asphalt emulsifier is selected from one or more of a monoquaternary ammonium salt emulsifier, a diquaternary ammonium salt emulsifier and an alkylphenolamine emulsifier, mixed in any proportion.

[0040] Optionally, the polymer modifier is selected from at least one of polybutadiene latex and styrene-butadiene latex.

[0041] Optionally, the nano additive is one or more of organic bentonite, graphite, graphene, nanocellulose fiber, and carbon nanotubes. The stability of the emulsion is increased, and the emulsion is prevented from stratification and precipitation during storage and use, which significantly improves the stability and non-stick wheel performance of the emulsified asphalt and further accelerates the demulsification speed.

[0042] Optionally, the toughening agent is selected from A-C629 of Honeywell wax series, which forms a layer of isolation film on the asphalt surface, thereby achieving a non-stick wheel effect.

[0043] Optionally, the elastomer modifier is polydimethylsiloxane.

[0044] Optionally, the acid-base regulator is selected from an acid solution with a concentration of 0.5-1.0 mol / L. Further, the acid is selected from hydrochloric acid or nitric acid, and more preferably, the acid is selected from hydrochloric acid.

[0045] Furthermore, in order to further improve the non-stick performance of the non-stick emulsified asphalt, the present application also includes: 0.1-0.35 parts by weight of 4-bromo-3-nitrophenol and 0.5-1.1 parts by weight of 2,6-dimethyl-3-methoxyphenylboric acid. When the modified asphalt is dispersed in the soap solution, the phenolic hydroxyl group in 4-bromo-3-nitrophenol can interact with the asphalt emulsifier to improve the dispersion stability of the emulsified asphalt in the soap solution. At the same time, when the emulsified asphalt is paved on the road surface and demulsified, the benzene ring in 4-bromo-3-nitrophenol combines with the emulsifier to form a three-dimensional network structure inside, which improves the adhesion and stability of the asphalt.

[0046] At the same time, the boron and active groups on 2,6-dimethyl-3-methoxyphenylboronic acid can combine with the asphalt surface, and at the same time change the double electron layer potential balance of the water-emulsified asphalt system, so that the bond between the asphalt and the asphalt emulsifier becomes weaker or disconnected, thereby achieving the purpose of accelerating demulsification and improving the non-stick wheel performance of the emulsified asphalt.

[0047] On the other hand, the present application provides a method for preparing a non-stick wheel emulsified asphalt, the preparation method is used to prepare the above-mentioned non-stick wheel emulsified asphalt, and the preparation method comprises the following steps:

[0048] (1) heating the base asphalt and the polymer modifier to 150-160° C. under stirring according to weight, maintaining the temperature, and continuing stirring for 4-6 hours to obtain modified asphalt;

[0049] (2) heating water to 40-80° C. to obtain hot water, adding an asphalt emulsifier, a nano-additive, a toughening agent, and an elastomer modifier to the hot water to obtain a mixed solution, and adding an acid-base regulator to the mixed solution until the pH value is 2.0-4.0 to obtain a soap solution;

[0050] (3) The modified asphalt and soap solution are subjected to high-speed shearing to obtain non-stick wheel emulsified asphalt.

[0051] The present application realizes the preparation of non-stick wheel emulsified asphalt through the above-mentioned scheme. First, the base asphalt and polymer modifier are heated to a molten state under stirring, and the base asphalt is modified by the polymer modifier to improve the stability and softening point of the asphalt, so that the modified asphalt has a higher load and high temperature stability, while improving the adhesion performance of the asphalt.

[0052] Heat water to 40-80℃ to obtain hot water, then add asphalt emulsifier, nano additive, toughening agent, elastomer modifier to the hot water, and adjust the pH value to 2.0-4.0 through acid-base regulator to obtain soap solution. During the preparation of soap solution, keep the temperature at 40-80℃ to avoid the soap solution temperature being too low, which will lead to incomplete emulsification and affect the quality of emulsified asphalt; or too high temperature will cause precipitation or stratification of emulsified asphalt during storage, thereby ensuring the stability of the emulsified asphalt system, or too high temperature will cause demulsification, thereby enhancing the non-stick wheel performance. Finally, pour the modified asphalt and soap solution into the colloid mill, and perform high-speed shearing at 60-90℃ to obtain non-stick wheel emulsified asphalt. The shear rate of the colloid mill is 2000-3000r / min. Maintaining appropriate stirring speed and temperature can promote the uniform distribution and demulsification process of emulsified asphalt. However, too high stirring speed will reduce the stability of emulsified asphalt, thereby affecting the demulsification effect.

[0053] On the other hand, the present application provides a non-stick wheel emulsified asphalt for use as a bonding layer between asphalt concrete layers, and between cement concrete and asphalt concrete layers during the construction or maintenance of roads, bridges, tunnels, etc. The non-stick wheel emulsified asphalt is the non-stick wheel emulsified asphalt mentioned above, or the non-stick wheel emulsified asphalt prepared by the above method.

[0054] The present invention is further described in detail below in conjunction with embodiment.But it should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention.The experimental method of unrecorded specific conditions in the following examples is usually measured according to national standards.If there is no corresponding national standard, then according to general international standards, normal conditions, or according to the conditions recommended by the manufacturer.Unless otherwise stated, all parts are weight parts, and all percentages are weight percentages.

[0055] Example 1

[0056] The preparation method of the non-stick wheel emulsified asphalt in this embodiment is as follows:

[0057] The method comprises the following steps:

[0058] (1) According to weight, 40 parts by weight of 70# Shell base asphalt and 1 part by weight of a polymer modifier are heated to 150-160° C. under stirring, and the temperature is maintained and stirring is continued for 4 hours to obtain a modified asphalt; the polymer modifier is selected from polybutadiene latex.

[0059] (2) heating water to 40° C. to obtain hot water, adding an asphalt emulsifier, a nano-additive, a toughening agent, and an elastomer modifier to the hot water to obtain a mixed solution, and adding a 0.5 mol / L hydrochloric acid solution to the mixed solution until the pH value is 2.0 to obtain a soap solution;

[0060] The asphalt emulsifier is selected from octadecyl trimethyl ammonium chloride, the nano additive is organic bentonite, the elastomer modifier is polydimethylsiloxane, and the toughening agent is selected from Honeywell wax series A-C629.

[0061] (3) The modified asphalt and the soap solution were poured into a colloid mill at a weight ratio of 40:29.3, and high-speed shearing was performed at 60°C to obtain non-stick wheel emulsified asphalt. The shearing speed of the colloid mill was 2000 r / min.

[0062] The soap solution includes: 0.3 parts by weight of asphalt emulsifier, 1 part by weight of nano additive, 27 parts by weight of water, 1 part by weight of toughening agent, and 1 part by weight of elastomer modifier.

[0063] Example 2

[0064] The preparation method of the non-stick wheel emulsified asphalt in this embodiment is as follows:

[0065] The method comprises the following steps:

[0066] (1) According to weight, 50 parts by weight of 70# Korean SK brand base asphalt and 2 parts by weight of a polymer modifier are heated to 155°C under stirring, and the temperature is maintained and stirred for 5 hours to obtain a modified asphalt; the polymer modifier is selected from polybutadiene latex.

[0067] (2) heating water to 60° C. to obtain hot water, adding an asphalt emulsifier, a nano-additive, a toughening agent, and an elastomer modifier to the hot water to obtain a mixed solution, and adding a 0.7 mol / L hydrochloric acid solution to the mixed solution until the pH value is 3.0 to obtain a soap solution;

[0068] The asphalt emulsifier is selected from octadecyl trimethyl ammonium chloride, the nano additive is organic bentonite, the elastomer modifier is polydimethylsiloxane, and the toughening agent is selected from Honeywell wax series A-C629.

[0069] (3) The modified asphalt and the soap solution were poured into a colloid mill at a weight ratio of 55:33, and high-speed shearing was performed at 75°C to obtain non-stick wheel emulsified asphalt. The shearing speed of the colloid mill was 2500 r / min.

[0070] The soap solution includes: 2 parts by weight of asphalt emulsifier, 3 parts by weight of nano additive, 30 parts by weight of water, 7 parts by weight of toughening agent, and 4 parts by weight of elastomer modifier.

[0071] Example 3

[0072] The preparation method of the non-stick wheel emulsified asphalt in this embodiment is as follows:

[0073] The method comprises the following steps:

[0074] (1) According to weight, 60 parts by weight of 70# Sinopec Zhenhai brand base asphalt and 5 parts by weight of a polymer modifier are heated to 160° C. under stirring, and the temperature is maintained and stirred for 6 hours to obtain a modified asphalt; the polymer modifier is selected from polybutadiene latex.

[0075] (2) heating water to 80° C. to obtain hot water, adding an asphalt emulsifier, a nano-additive, a toughening agent, and an elastomer modifier to the hot water to obtain a mixed solution, and adding a 1.0 mol / L hydrochloric acid solution to the mixed solution until the pH value is 4.0 to obtain a soap solution;

[0076] The asphalt emulsifier is selected from octadecyl trimethyl ammonium chloride, the nano additive is organic bentonite, the elastomer modifier is polydimethylsiloxane, and the toughening agent is selected from Honeywell wax series A-C629.

[0077] (3) The modified asphalt and soap solution were poured into a colloid mill at a weight ratio of 65:56, and high-speed shearing was performed at 90°C to obtain non-stick wheel emulsified asphalt. The shearing speed of the colloid mill was 3000 r / min.

[0078] The soap solution includes: 3 parts by weight of asphalt emulsifier, 5 parts by weight of nano additive, 32 parts by weight of water, 10 parts by weight of toughening agent, and 6 parts by weight of elastomer modifier.

[0079] Comparative Example 1

[0080] The method for preparing the non-stick wheel emulsified asphalt in this embodiment comprises the following steps:

[0081] The difference from Example 2 is that:

[0082] (3) The modified asphalt and the soap solution were poured into a colloid mill at a weight ratio of 39:29.3, and high-speed shearing was performed at 75°C to obtain non-stick wheel emulsified asphalt. The shearing speed of the colloid mill was 2500 r / min.

[0083] The soap solution includes: 0.2 parts by weight of asphalt emulsifier, 0 parts by weight of nano additive, 30 parts by weight of water, 0.9 parts by weight of toughening agent, and 0.8 parts by weight of elastomer modifier.

[0084] Comparative Example 2

[0085] The method for preparing the non-stick wheel emulsified asphalt in this embodiment comprises the following steps:

[0086] The difference from Example 2 is that:

[0087] (3) The modified asphalt and the soap solution were poured into a colloid mill at a weight ratio of 66:29.3, and high-speed shearing was performed at 75°C to obtain non-stick wheel emulsified asphalt. The shearing speed of the colloid mill was 2500 r / min.

[0088] The soap solution includes: 3.1 parts by weight of asphalt emulsifier, 5.1 parts by weight of nano additive, 30 parts by weight of water, 11 parts by weight of toughening agent, and 7 parts by weight of elastomer modifier.

[0089] Experimental Example 1

[0090] Non-stick wheel test

[0091] In order to evaluate the adhesion inhibition effect of the non-stick wheel emulsified asphalt provided in Examples 1 to 3, Comparative Example 1, and Comparative Example 2 on tires, the adhesion effect was evaluated in combination with the emulsified asphalt tire adhesion rate test method in the Japan Road Association Pavement Survey Test Method Handbook. The test uses a rutting test machine to measure the non-stick wheel emulsified asphalt adhesion rate at different temperatures.

[0092] (1) Sample preparation: The non-stick wheel emulsified asphalt prepared in Examples 1 to 3 and Comparative Examples 1 and 2 was heated at 0.8 kg / m 2 Apply the amount of adhesive evenly on the flat oil felt. The size of the adhesive layer should be 200mm×80mm. Then put the sample into the oven and cure it at 50℃ for 1h to ensure sufficient demulsification of the adhesive layer.

[0093] (2) Non-stick wheel effect test: The prepared sample, a 150mm×50mm×5mm rubber strip (hardness 65HA) and unused A4 paper were placed in a 70℃ oven for 0.5h, and then the sample, A4 paper and rubber strip were quickly taken out. The sample was covered with the insulating A4 paper, and the rubber strip was pressed on the sticky layer. The rutting test machine was used to repeatedly roll the sample 10 times under a 35kg counterweight. The mass change of the A4 was weighed to quantitatively evaluate the non-stick wheel performance. The test took no more than 30s from the time the sample was taken out to the completion of the rolling. The rolling process was carried out at different temperatures (23±2℃, 60±2℃, 70±2℃). Three parallel tests were set up for each test group, and the average value was taken. The test results are shown in Table 1. Among them, the tire adhesion rate (a, %) is calculated as follows: a=(m 1 -m 0 ) / m 0 ;

[0094] m 0 is the mass of A4 paper before rolling, m 1 It is the mass of A4 paper after rolling.

[0095] Table 1

[0096]

[0097]

[0098] The results show that the non-stick wheel emulsified asphalt provided in the present application has excellent non-stick wheel performance at different temperatures, so that the emulsified asphalt will not stick to the construction equipment. By compounding and mixing the components in a special proportion, the components interact with each other, which increases the demulsification speed of the emulsified asphalt, thereby facilitating on-site construction and improving the fault tolerance rate of on-site construction.

[0099] Experimental Example 2

[0100] Demulsification speed test

[0101] Refer to T 0658-1993 "Emulsified Asphalt Demulsification Speed ​​Test", the method for judging the demulsification of non-stick wheel emulsified asphalt is as follows: After the non-stick wheel emulsified asphalt provided by Example 1-Example 3, Comparative Example 1, and Comparative Example 2 is spread, a piece of absorbent white paper is gently pressed on the road surface every 5 minutes, and the position of each pressing is not repeated. When no brown spots are seen on the white paper, the non-stick wheel emulsified asphalt has been demulsified. Each test group is set up with 3 parallel tests, and the average value is taken. The test results are as follows Figure 1 shown.

[0102] observe Figure 1It can be seen that the demulsification speed of the non-stick wheel emulsified asphalt provided by Examples 1 to 3 of the present application is significantly faster than that of Comparative Example 1 and Comparative Example 2. The nano additives increase the stability of the emulsion as an emulsifier and modifier through the Pickering emulsion mechanism, prevent the emulsion from stratification, precipitation and other phenomena during storage and use, significantly improve the stability and non-stick wheel performance of the emulsified asphalt, and further accelerate the demulsification speed. The stability of the emulsion is increased by nano additives, and the emulsion is prevented from stratification, precipitation and other phenomena during storage and use. The stability and non-stick wheel performance of the emulsified asphalt are significantly improved, and the demulsification speed is further accelerated. By compounding and mixing the components in a special ratio, the components interact with each other, and the demulsification speed of the emulsified asphalt is increased, which is convenient for on-site construction and improves the fault tolerance rate of on-site construction.

[0103] Experimental Example 3

[0104] Adhesion test

[0105] The softening point, ductility, adhesion pull-out strength and composite pull-out of the non-stick wheel emulsified asphalt provided in Examples 1 to 3, Comparative Example 1 and Comparative Example 2 were tested, wherein the test methods for softening point and ductility were carried out in accordance with the test method of JTG E20-2011 "Testing Procedures for Asphalt and Asphalt Mixtures for Highway Engineering"; the test methods for adhesion pull-out strength and composite pull-out strength were carried out in accordance with the test method of GB / T 5210-2006, and 3 parallel tests were set for each test group, and the average value was taken. The test results are shown in Table 2.

[0106] Table 2

[0107]

[0108] As can be seen from Table 2, the adhesion pull-out strength and composite pull-out strength of Examples 1 to 3 are significantly higher than those of Comparative Examples 1 and 2, indicating that the non-stick wheel emulsified asphalt has good adhesion and bonding properties. When used as a bonding layer between asphalt concrete layers and between cement concrete and asphalt concrete layers, it can improve the adhesion between pavement layers, thereby improving the bearing capacity and durability of the pavement. At the same time, Examples 1 to 3 show higher softening points and better ductility, indicating that the non-stick wheel emulsified asphalt provided by the present application has good temperature stability and durability, as well as good plasticity.

[0109] Example 4

[0110] The method for preparing the non-stick wheel emulsified asphalt in this embodiment comprises the following steps:

[0111] The difference from Example 2 is that:

[0112] (3) The modified asphalt and soap solution were poured into a colloid mill at a weight ratio of 55:33, and then 0.1 parts by weight of 4-bromo-3-nitrophenol and 0.5 parts by weight of 2,6-dimethyl-3-methoxyphenylboric acid were added, and high-speed shearing was performed at 75°C to obtain non-stick wheel emulsified asphalt. The base asphalt used was 70# PetroChina Kunlun brand base asphalt.

[0113] Example 5

[0114] The method for preparing the non-stick wheel emulsified asphalt in this embodiment comprises the following steps:

[0115] The difference from Example 2 is that:

[0116] (3) The modified asphalt and soap solution were poured into a colloid mill at a weight ratio of 55:33, and then 0.2 parts by weight of 4-bromo-3-nitrophenol and 0.8 parts by weight of 2,6-dimethyl-3-methoxyphenylboric acid were added, and high-speed shearing was performed at 75°C to obtain non-stick wheel emulsified asphalt. The base asphalt used was 70# PetroChina Kunlun brand base asphalt.

[0117] Example 6

[0118] The method for preparing the non-stick wheel emulsified asphalt in this embodiment comprises the following steps:

[0119] The difference from Example 2 is that:

[0120] (3) The modified asphalt and soap solution were poured into a colloid mill at a weight ratio of 55:33, and then 0.35 parts by weight of 4-bromo-3-nitrophenol and 1.1 parts by weight of 2,6-dimethyl-3-methoxyphenylboric acid were added, and high-speed shearing was performed at 75°C to obtain non-stick wheel emulsified asphalt. The base asphalt used was 70# PetroChina Kunlun brand base asphalt.

[0121] Comparative Example 3

[0122] The method for preparing the non-stick wheel emulsified asphalt in this embodiment comprises the following steps:

[0123] The difference from Example 5 is that:

[0124] (3) The modified asphalt and soap solution were poured into a colloid mill in a weight ratio of 55:33, and 0.2 parts by weight of 4-bromo-3-nitrophenol was added. The mixture was sheared at 75°C at high speed to obtain a non-stick wheel emulsified asphalt.

[0125] Comparative Example 4

[0126] The method for preparing the non-stick wheel emulsified asphalt in this embodiment comprises the following steps:

[0127] The difference from Example 5 is that:

[0128] (3) The modified asphalt and soap solution were poured into a colloid mill in a weight ratio of 55:33, and 0.8 parts by weight of 2,6-dimethyl-3-methoxyphenylboric acid was added, and high-speed shearing was performed at 75°C to obtain non-stick wheel emulsified asphalt.

[0129] Experimental Example 4

[0130] The test method of Experimental Example 1 was used to test the adhesion rate of the non-stick wheel emulsified asphalt provided in Examples 4 to 6, Comparative Example 3, and Comparative Example 4 at 70°C ± 2°C. Three parallel tests were set up for each test group, and the average value was taken. The test results are shown in Table 3.

[0131] Table 3

[0132]

[0133]

[0134] The results show that the dispersion stability of emulsified asphalt in soap solution is improved by adding 4-bromo-3-nitrophenol and 2,6-dimethyl-3-methoxyphenylboronic acid. At the same time, when the emulsified asphalt is paved on the road surface and demulsified, the benzene ring in 4-bromo-3-nitrophenol combines with the emulsifier to form a three-dimensional network structure inside, which improves the adhesion and stability of the asphalt. At the same time, the boron and active groups on 2,6-dimethyl-3-methoxyphenylboronic acid can combine with the asphalt surface, and change the double electron layer potential balance of the water-emulsified asphalt system, so that the combination between the asphalt and the asphalt emulsifier becomes weak or disconnected, thereby achieving the purpose of accelerating demulsification and improving the non-stick wheel performance of the emulsified asphalt.

[0135] Experimental Example 5

[0136] Demulsification speed test

[0137] The test method of Experimental Example 2 was used to test the demulsification speed of the non-stick wheel emulsified asphalt provided in Examples 4 to 6, Comparative Example 3, and Comparative Example 4. Three parallel tests were set up for each test group, and the average value was taken. The test results are shown in Figure 2. Figure 2 shown.

[0138] Figure 2 It can be seen that by adding 4-bromo-3-nitrophenol and 2,6-dimethyl-3-methoxyphenylboric acid, the demulsification rate of the non-stick wheel emulsified asphalt provided in the present application is significantly accelerated, especially compared with Comparative Example 3 and Comparative Example 4, which shows that 2,6-dimethyl-3-methoxyphenylboric acid increases the demulsification rate of the non-stick wheel emulsified asphalt faster.

[0139] Experimental Example 6

[0140] Adhesion test

[0141] The test method of Experimental Example 3 was used to test the adhesion pull-out strength and composite part pull-out of the non-stick wheel emulsified asphalt provided in Examples 4 to 6, Comparative Example 3, and Comparative Example 4. Three parallel tests were set up for each test group, and the average value was taken. The test results are shown in Table 4.

[0142] Table 4

[0143]

[0144] As shown in Table 4, the adhesion of Examples 4 to 6 is significantly improved compared with Comparative Examples 3 and 4, and it is found that the adhesion of the non-stick wheel emulsified asphalt provided by Comparative Examples 3 and 4 is higher than that of Comparative Example 4, indicating that 4-bromo-3-nitrophenol has a more obvious promoting effect on the adhesion of the non-stick wheel emulsified asphalt than 2,6-dimethyl-3-methoxyphenylboric acid. And combined with the results of Table 3, 4-bromo-3-nitrophenol can better improve the adhesion and stability of asphalt, while 2,6-dimethyl-3-methoxyphenylboric acid is more inclined to accelerate the demulsification effect. The two work synergistically with other components in the emulsified asphalt to jointly improve the non-stick wheel performance and interlayer adhesion of the non-stick wheel emulsified asphalt.

[0145] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, ordinary technicians in the field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A non-stick wheel emulsified asphalt, characterized in that: The non-stick wheel emulsified asphalt comprises modified asphalt and soap solution in a weight ratio of (40-65):(29.3-56); The modified asphalt comprises: 40-60 parts by weight of base asphalt and 0-5 parts by weight of polymer modifier, and the soap solution comprises: 0.3-3 parts by weight of asphalt emulsifier, 0-5 parts by weight of nano additive, 27-32 parts by weight of water, 1-10 parts by weight of toughening agent, 1-6 parts by weight of elastomer modifier and acid-base regulator; The amount of the acid-base regulator added is based on adjusting the pH value of the soap solution to 2.0-4.

0.

2. The non-stick wheel emulsified asphalt according to claim 1, characterized in that: The matrix asphalt is 70# matrix asphalt or 90# matrix asphalt.

3. The non-stick wheel emulsified asphalt according to claim 1, characterized in that: The asphalt emulsifier is selected from at least one of a cationic asphalt emulsifier and a non-ionic asphalt emulsifier.

4. The non-stick wheel emulsified asphalt according to claim 1, characterized in that: The polymer modifier is selected from at least one of polybutadiene latex and styrene-butadiene latex.

5. The non-stick wheel emulsified asphalt according to claim 1, characterized in that: The nano additive is one or more of organic bentonite, graphite, graphene, nano cellulose fiber and carbon nanotube.

6. The non-stick wheel emulsified asphalt according to claim 1, characterized in that The non-stick wheel emulsified asphalt is characterized in that the toughening agent is selected from A-C629 of Honeywell wax series.

7. The non-stick wheel emulsified asphalt according to claim 1, characterized in that: The elastomer modifier is polydimethylsiloxane.

8. The non-stick wheel emulsified asphalt according to claim 1, characterized in that: The acid-base regulator is selected from an acid solution with a concentration of 0.5-1.0 mol / L.

9. A method for preparing non-stick wheel emulsified asphalt, characterized in that: The method is used to prepare the non-stick wheel emulsified asphalt according to any one of claims 1 to 8, and the method comprises the following steps: (1) heating the base asphalt and the polymer modifier to 150-160° C. under stirring according to weight, maintaining the temperature, and continuing stirring for 4-6 hours to obtain modified asphalt; (2) heating the water to 40-80° C. by weight to obtain hot water, adding the asphalt emulsifier, the nano-additive, the toughening agent, and the elastomer modifier to the hot water to obtain a mixed solution, and adding the acid-base regulator to the mixed solution until the pH value is 2.0-4.0 to obtain a soap solution; (3) subjecting the modified asphalt and the soap solution to high-speed shearing to obtain the non-stick wheel emulsified asphalt.

10. Application of a non-stick wheel emulsified asphalt as a bonding layer between asphalt concrete layers and between cement concrete and asphalt concrete layers in the process of new construction or maintenance and repair of roads, bridges, tunnels, etc., characterized in that: The non-stick wheel emulsified asphalt is the non-stick wheel emulsified asphalt described in any one of claims 1 to 8, or the non-stick wheel emulsified asphalt prepared by the method described in claim 9.

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