A non-stick wheel emulsified asphalt with a thin layer of overlay tack oil based on asynchronous construction and a preparation method thereof

Abstract

The invention discloses a non-stick wheel emulsified asphalt with a thin layer of overlay tack oil based on asynchronous construction and a preparation method thereof, and relates to the technical field of pavement asphalt materials. The raw material ratio is as follows by mass percentage: SBS and base asphalt 50% to 55%, cosolvent 0.1% to 0.5%, emulsifier 0.4% to 1.0%, stabilizer 1.0% to 2.0%, thickener 0.3% to 0.5%, water-based high molecular polymer 4% to 10%, and the balance is water. Preparation method: firstly, SBS modifier and cosolvent are added to base asphalt to prepare modified asphalt, then emulsifier, stabilizer and thickener are added to water to prepare soap solution, then asphalt and soap solution are dispersed and ground to prepare emulsified modified asphalt; finally, water-based high molecular polymer material is added to emulsified modified asphalt to prepare high-performance non-stick wheel emulsified asphalt. The invention breaks through the technical difficulty that hard asphalt is not easy to emulsify, improves road performance and achieves non-stick wheel at the same time.

Description

Technical Field

[0001] The invention relates to the field of asphalt materials, and in particular to a non-stick wheel emulsified asphalt with a thin layer of overlay tack oil based on asynchronous construction and a preparation method thereof. Background Art

[0002] The tack coat is a thin layer of asphalt material spread to strengthen the bonding between asphalt layers and between asphalt layers and cement concrete pavement. The function of the tack coat is to bond the various surface layers together to prevent interlayer structural displacement caused by vehicle loads, and effectively reduce the occurrence of asphalt pavement diseases. Commonly used tack coat materials include asphalt and emulsified asphalt. Emulsified asphalt has the advantages of saving energy, being green and environmentally friendly, and being safe and convenient to use, so it has become a widely used tack coat material.

[0003] At present, emulsified asphalt for tack coat has problems such as slow demulsification speed, low molding strength, and poor road performance in actual engineering applications. Even if the emulsified asphalt has been completely demulsified and formed into a film, it is often rolled over and carried away by subsequent construction vehicles such as pavers and transport vehicles, causing damage to the tack coat and reducing the bonding effect. In addition, asphalt plaques will be left where vehicles with sticky wheels pass, causing pollution to the environment.

[0004] The development of a high-performance non-stick wheel emulsified asphalt can effectively solve this problem. The existing non-stick wheel emulsified asphalt technology generally uses hard asphalt or low-grade asphalt. The main principle is to increase the hardness of the asphalt and make its softening temperature above 70°C to ensure that the asphalt does not soften at high temperatures after demulsification and film formation, thereby achieving the effect of non-stick wheels. However, the non-stick wheel emulsified asphalt prepared by this method has the following problems: first, the asphalt emulsification is difficult, and the storage stability after emulsification is poor. Second, the bonding performance is poor, the evaporation residue has poor low-temperature performance, and the 5°C elongation does not meet the technical requirements for the adhesive layer in the construction technical specifications. After a period of use, asphalt pavement is prone to peeling, interlayer separation and other diseases. Summary of the invention

[0005] In view of the above problems, the present invention provides a non-stick wheel emulsified asphalt based on an asynchronously constructed thin-layer overlay tack coat oil and a preparation method thereof. The non-stick wheel emulsified asphalt has the advantages of fast demulsification speed, high bonding strength, high-temperature non-stick wheel, simple production process, and excellent road performance. It can significantly improve the deficiencies of the prior art, effectively solve the problems of low construction efficiency caused by slow demulsification speed and slow molding in ordinary tack coat construction, and low durability and environmental pollution caused by sticking wheels, and is helpful to promote the popularization and application of the asynchronously constructed thin-layer overlay technology.

[0006] The non-stick wheel emulsified asphalt based on the asynchronously constructed thin-layer overlay tack oil of the present invention is prepared according to the following mass percentages:

[0007] SBS and matrix asphalt: 50% to 55%;

[0008] Cosolvent: 0.1%~0.5%;

[0009] Emulsifier: 0.4%~1.0%;

[0010] Stabilizer: 1.0%~2.0%;

[0011] Thickener: 0.3%~0.5%;

[0012] Water-based polymer: 4% to 10%

[0013] Water: Balance.

[0014] Among them, SBS (styrene-butadiene-styrene block copolymer) is used as a modifier and base asphalt to prepare SBS modified asphalt. In terms of mass percentage, SBS is 3% to 5.5% of the mass of the base asphalt. The base asphalt can be No. 90, No. 110 or No. 70 road petroleum asphalt.

[0015] The co-solvent is one or more of ethylene glycol, propylene glycol, isopropanol, dipropylene glycol butyl ether, and butyl carbitol, and is used alone or in a mixed manner.

[0016] The emulsifier is one or more of REDICOTE E-4819 produced by AkzoNobel of the Netherlands, AA-63D produced by Ingevity of the United States, and A9 produced by Shandong Shengquan New Materials Co., Ltd., and is used alone or in a mixed manner.

[0017] The stabilizer is one or more of CaCl2, NaCl or NH4C1, and is used alone or in combination.

[0018] The thickener is one or more of methyl cellulose, hydroxymethyl cellulose, hydroxyethyl cellulose or methyl hydroxyethyl cellulose, and is used alone or in a mixed form to prepare an aqueous solution.

[0019] The water-based high molecular polymer belongs to the latex of silicone hybrid ketone carbonyl compound. It is Hunan Linte Technology Co., Ltd. LINTEC EP-803 is a high molecular weight cationic single-component nano-particle epoxy emulsion made by a special process. It has excellent compatibility with cationic emulsified asphalt.

[0020] The present invention also provides a method for preparing the non-stick wheel emulsified asphalt with a thin layer of overlay tack oil based on asynchronous construction, and the specific steps of the preparation method are:

[0021] 1) Preheat the base asphalt to 170°C-180°C, add the SBS modifier and the cosolvent to the base asphalt in proportion, pass through an asphalt colloid mill, perform low-speed shear mixing at a speed of 1000-3000 r / min for 15-20 minutes, and perform high-speed shear mixing at a speed of 4500-5500 r / min for 30-45 minutes to obtain modified asphalt; control the temperature of the modified asphalt to be 155°C-165°C for standby use;

[0022] 2) heating water to 45-55° C., adding an emulsifier, a stabilizer and an aqueous solution of a thickener to the water, wherein the mass concentration of the aqueous solution of the thickener is 1-4%, and stirring the mixture at a stirring rate of 1000-3000 r / min to obtain a soap solution; adjusting the pH value of the soap solution to 1.5-2.5, and heating the soap solution to 50-60° C. for standby use;

[0023] 3) The prepared modified asphalt and soap solution are transported to a colloid mill, and after being uniformly dispersed and ground in the colloid mill, an oil-in-water emulsion is formed to prepare an emulsified modified asphalt;

[0024] 4) When the temperature of the emulsified modified asphalt drops to room temperature, the water-based high molecular polymer material is added to the emulsified modified asphalt, and stirred for 15min to 45min at a stirring rate of 1000 to 3000r / min to prepare a high-performance non-stick wheel emulsified asphalt.

[0025] The non-stick wheel emulsified asphalt of the present invention can be used as an interlayer bonding material for asynchronous ultra-thin wear layer tack oil or other thin layer covering technologies. The raw materials of the method of the present invention are easily available, the production process is simple, the non-stick wheel emulsified asphalt has excellent road performance, and various technical indicators meet the requirements of technical specifications. It is significantly superior to the non-stick wheel emulsified asphalt of the hard asphalt type in terms of low-temperature crack resistance and bonding performance. By adding high molecular polymer materials, the emulsified asphalt has non-stick wheel properties. The high molecular polymer material belongs to a high molecular weight cationic single-component nanoparticle epoxy emulsion. The emulsion has lipophilic and hydrophobic properties. By adjusting the proportion of active groups, after the emulsified asphalt breaks the emulsion and forms a film, a relatively thin isolation film will be formed on the asphalt surface. The isolation film isolates the wheel and the asphalt, achieving a non-stick wheel effect. When the upper hot asphalt mixture is spread on the tack layer, the isolation film will soften. Due to its small molecular weight and strong lipophilicity, it is easy to disperse into the emulsified asphalt evaporation residue and the upper asphalt through molecular migration and similar compatibility principle, which enhances the interfacial strength of the two interfaces and improves the bonding performance. The bonding strength is increased by more than 50% compared with the traditional tack layer. The successful development of non-stick wheel emulsified asphalt promotes the asynchronous construction process using traditional equipment, is suitable for more construction units, reduces the project cost, and has good application prospects for the promotion and application of asynchronous thin layer overlay technology.

[0026] (3) Technical indicators of non-stick wheel emulsified asphalt

[0027] During the synthesis of the non-stick wheel modified emulsified asphalt of the present invention, a single-component nano-particle epoxy emulsion is added to improve the crosslinking degree and polymerization degree of the asphalt itself, thereby effectively improving the road performance of the emulsified asphalt, especially the low-temperature performance.

[0028] The high molecular weight cationic single-component nano-particle epoxy emulsion used in the present invention has both lipophilic and hydrophobic groups. The lipophilic groups are cross-linked with asphalt to form a stable network structure, which is evenly dispersed in the asphalt to improve the adhesion and shear resistance of the asphalt. At the same time, due to the small molecular weight, under the joint action of the lipophilic and hydrophobic groups, a relatively thin isolation film is formed on the surface of the asphalt to isolate the tire from adhesion to the asphalt film, thereby achieving the effect of non-stick wheels.

[0029] The non-stick wheel emulsified asphalt evaporation residue softening point of the thin layer of overlay tack oil based on asynchronous construction described in the present invention is greater than 70°C, the elongation at 5°C is greater than 30cm, the interlayer tack oil tensile strength (25°C) is greater than 0.5Mpa, and the shear strength (25°C, direct shear) is greater than 1.1MPa.

[0030] The non-stick wheel emulsified asphalt of the present invention combines emulsification modification technology with water-based high molecular low melting point polymer modification technology, breaking through the technical difficulty of hard asphalt being difficult to emulsify, improving road performance and achieving non-stick wheels at the same time. The non-stick wheel emulsified asphalt has the advantages of fast demulsification speed, high bonding strength, high temperature non-stick wheels, simple production process, and excellent road performance. It is suitable for asynchronous construction of thin-layer overlays, improves the road performance of ordinary adhesive layers, solves the problem of adhesive layer oil adhering to construction vehicle tires and environmental pollution during asynchronous construction of thin-layer overlays, and helps promote the promotion and application of asynchronous construction thin-layer overlay technology.

[0031] Beneficial effects of the present invention:

[0032] 1) The production process is simple and does not require additional production equipment. It can be achieved by directly adding water-based polymer materials to the emulsified asphalt finished product storage tank and stirring for 15 minutes to 45 minutes, and no heating is required during the process.

[0033] 2) The road performance is comprehensively improved. Compared with ordinary tack coat, the bonding strength of the tack coat is improved by more than 50%, which improves the durability of the asphalt pavement. Compared with similar non-stick wheel emulsified asphalt products, the low-temperature performance is significantly improved, and the elongation at 5°C is greater than 30cm.

[0034] 3) While ensuring excellent road performance, it also has excellent high temperature (60°C) non-stick wheel performance, avoiding damage to the adhesive layer material and environmental pollution caused by construction vehicles. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1Pull-out strength test;

[0036] Figure 2 Shear strength test (direct shear);

[0037] Figure 3 Non-stick wheel test;

[0038] Figure 4 Observation of non-stick wheel test results. DETAILED DESCRIPTION

[0039] The following non-limiting embodiments may enable a person skilled in the art to more fully understand the present invention, but are not intended to limit the present invention in any way.

[0040] The base asphalt in the following examples is No. 90 road petroleum asphalt.

[0041] Example 1

[0042] High-performance non-stick wheel emulsified asphalt is made according to the following mass percentages: SBS and base asphalt 50%, co-solvent 0.3%, emulsifier 0.4%, stabilizer 2.0%, thickener 0.35%, water-based polymer 5%, and the balance is water; among which SBS accounts for 3.5% of the mass of the base asphalt.

[0043] Preparation of modified asphalt: preheat the base asphalt to 170°C, add SBS modifier and co-solvent to the base asphalt in proportion, shear and mix at a low speed of 3000r / min for 20min, and shear at a high speed of 5000r / min for 45min to obtain modified asphalt, adjust the temperature of the modified asphalt to 165°C for standby use. The amount of modifier SBS is 3.5%, and the amount of co-solvent is 0.3%.

[0044] Preparation of high-performance non-stick wheel emulsified asphalt: preheat water to 50°C, add emulsifier, stabilizer and thickener aqueous solution to water, the concentration of thickener aqueous solution is 2%, stir evenly at a stirring rate of 2000r / min, adjust the pH value of soap solution to 1.8, and adjust the soap solution temperature to 60°C. Among them, the emulsifier is REDICOTE E-4819 produced by AkzoNobel, the dosage is 0.4%, the stabilizer is CaCl2, the dosage is 2%, and the thickener is methyl cellulose, the dosage is 0.35%. The modified asphalt and soap solution are transported to the colloid mill, dispersed and ground by the colloid mill to prepare emulsified modified asphalt; when the temperature of the emulsified modified asphalt drops to room temperature, the water-based polymer material LINTEC EP-803 is added to the emulsified modified asphalt, the dosage is 5%, and stirred for 20 minutes at a stirring rate of 2000r / min to prepare high-performance non-stick wheel emulsified asphalt.

[0045] Example 2

[0046] High-performance non-stick wheel emulsified asphalt is made according to the following mass percentages: SBS and base asphalt 50%, co-solvent 0.3%, emulsifier 0.4%, stabilizer 2.0%, thickener 0.35%, water-based high molecular polymer 6%, and the balance is water; among which SBS accounts for 3.5% of the mass of the base asphalt.

[0047] Preparation of modified asphalt: preheat the base asphalt to 170°C, add the modifier and co-solvent to the base asphalt in proportion, shear and mix at a low speed of 3000r / min for 20min, and shear at a high speed of 5000r / min for 45min to obtain modified asphalt, adjust the temperature of the modified asphalt to 165°C and set aside. The amount of modifier SBS is 3.5%, and the amount of co-solvent is 0.3%.

[0048] Preparation of high-performance non-stick wheel emulsified asphalt: preheat water to 50°C, add emulsifier, stabilizer and thickener aqueous solution into water, thickener aqueous solution concentration is 2%, stir evenly at a stirring rate of 2000r / min, adjust the pH value of the soap solution to 1.8, and adjust the soap solution temperature to 60°C. Among them, the emulsifier is REDICOTE E-4819 produced by AkzoNobel, the dosage is 0.4%, the stabilizer is CaCl2, the dosage is 2%, and the thickener is methyl cellulose, the dosage is 0.35%. The modified asphalt and soap solution are transported to the colloid mill, dispersed and ground by the colloid mill to prepare emulsified modified asphalt; when the temperature of the emulsified modified asphalt drops to room temperature, the water-based high molecular polymer material LINTEC EP-803 is added to the emulsified modified asphalt in an amount of 6%, and stirred for 20 minutes at a stirring rate of 2000 r / min to prepare high-performance non-stick wheel emulsified asphalt.

[0049] Example 3

[0050] High-performance non-stick wheel emulsified asphalt is made according to the following mass percentages: SBS and base asphalt 50%, co-solvent 0.3%, emulsifier 0.4%, stabilizer 2.0%, thickener 0.35%, water-based high molecular polymer 8%, and the balance is water; among which SBS accounts for 3.5% of the mass of the base asphalt.

[0051] Preparation of modified asphalt: preheat the base asphalt to 170°C, add SBS modifier and co-solvent to the base asphalt in proportion, shear and mix at a low speed of 3000r / min for 20min, and shear at a high speed of 5000r / min for 45min to obtain modified asphalt, adjust the temperature of the modified asphalt to 165°C and set aside. The amount of modifier SBS is 3.5%, and the amount of co-solvent is 0.3%.

[0052] Preparation of high-performance non-stick wheel emulsified asphalt: preheat water to 50°C, add emulsifier, stabilizer and thickener aqueous solution into water, the concentration of thickener aqueous solution is 2%, stir evenly at a stirring rate of 2000r / min, adjust the pH value of soap solution to 1.8, and adjust the temperature of soap solution to 60°C. Among them, the emulsifier is REDICOTE E-4819 produced by AkzoNobel, the dosage is 0.4%, the stabilizer is CaCl2, the dosage is 2%, and the thickener is methyl cellulose, the dosage is 0.35%. The modified asphalt and soap solution are transported to the colloid mill, dispersed and ground by the colloid mill to prepare emulsified modified asphalt; when the temperature of the emulsified modified asphalt drops to room temperature, add the water-based polymer material LINTEC EP-803 into the emulsified modified asphalt, the dosage is 8%, stir for 20 minutes at a stirring rate of 2000r / min, and prepare high-performance non-stick wheel emulsified asphalt.

[0053] Example 4

[0054] High-performance non-stick wheel emulsified asphalt is made according to the following mass percentages: SBS and base asphalt 50%, co-solvent 0.3%, emulsifier 0.7%, stabilizer 2.0%, thickener 0.35%, water-based high molecular polymer 6%, and the balance is water; among which SBS accounts for 3.5% of the mass of the base asphalt.

[0055] Preparation of modified asphalt: preheat the base asphalt to 170°C, add SBS modifier and co-solvent to the base asphalt in proportion, shear and mix at a low speed of 3000r / min for 20min, and shear at a high speed of 5000r / min for 45min to obtain modified asphalt, adjust the temperature of the modified asphalt to 165°C and set aside. The amount of modifier SBS is 3.5%, and the amount of co-solvent is 0.3%.

[0056] Preparation of high-performance non-stick wheel emulsified asphalt: preheat water to 50°C, add emulsifier, stabilizer and thickener aqueous solution to water, the concentration of thickener aqueous solution is 2%, stir evenly at a stirring rate of 2000r / min, adjust the pH value of soap solution to 1.8, and adjust the temperature of soap solution to . Among them, the emulsifier is A9 produced by Shandong Shengquan New Materials Co., Ltd., the dosage is 0.7%, the stabilizer is CaCl2, the dosage is 2%, and the thickener is methyl cellulose, the dosage is 0.35%. The modified asphalt and soap solution are transported to the colloid mill, dispersed and ground by the colloid mill to prepare emulsified modified asphalt; when the temperature of the emulsified modified asphalt drops to room temperature, the water-based polymer material LINTEC EP-803 is added to the emulsified modified asphalt, the dosage is 6%, and stirred for 20 minutes at a stirring rate of 2000r / min to prepare high-performance non-stick wheel emulsified asphalt.

[0057] Among them, the conventional index test methods of emulsified asphalt are carried out according to the test method of JTG E20-2011; the bonding strength test is evaluated by the pull-out strength test of the China Highway Society group standard "Technical Guidelines for the Construction of Emulsified Asphalt Adhesive Layers for Non-Stick Wheels". Figure 1 ) The specific test steps are as follows:

[0058] 1) Referring to the current "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering" (JTG E20), use a rutting machine to prepare AC20 asphalt mixture rutting plates; use a cutting machine to cut off a thin layer of the rutting plate surface to ensure that its surface is smooth and free of slurry, water stains, etc.

[0059] 2) Apply the non-stick wheel emulsified asphalt evenly on the surface of the asphalt rutting plate, with a coating amount of 0.45kg / m 2 ;

[0060] 3) Place the rutting board in a 60°C oven for curing for 6 hours.

[0061] 4) Use the Brothers Good adhesive to stick the pulling head to the surface of the non-stick wheel emulsified asphalt coating and perform curing.

[0062] 5) Place the asphalt rutting plate with the pulling head in an environmental chamber at the test temperature for 4 hours;

[0063] 6) Connect the loading module of the pulling instrument to the pulling head, start the pulling instrument, test and record the maximum pulling force at failure, the contact area with the pulling head, and convert the pulling strength.

[0064] Shear strength: We designed and manufactured a direct shear tester (abbreviated as direct shear tester), which can be installed in test equipment with servo system and environmental chamber (such as MTS, LMT, etc.), so that the load, loading rate and test temperature can be adjusted as needed. This loading equipment can automatically collect and process data. Figure 2 ) The specific test steps are as follows:

[0065] 1) According to the current "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering" (JTG E20), AC16 asphalt mixture specimens were prepared using a rotary compactor, and demolding was not performed after the molding was completed;

[0066] 2) When the specimen is cooled to room temperature, evenly apply the non-stick wheel emulsified asphalt on the surface of the asphalt specimen, with a coating amount of 0.45 kg / m 2 ;

[0067] 3) Place the asphalt specimen in a 60°C oven for curing for 6 hours.

[0068] 4) After the non-stick wheel emulsified asphalt tack layer oil forms a film, a thin layer of UTFC10 hot mix is ​​loaded into the test mold, rotated and compacted, and demolded after rolling 100 times. The test piece preparation is completed;

[0069] 5) The direct shear apparatus is used in conjunction with the LMT equipment, and the displacement-controlled loading mode is adopted. The test temperature is 25°C, the loading rate is 50mm / min, and the specimen is kept at the test temperature for 4 hours before the test;

[0070] 6) Connect the sensor, conduct a direct shear test, and calculate the shear strength through the load-displacement deformation diagram.

[0071] The non-stick wheel evaluation is conducted using the non-stick wheel test in the China Highway Society group standard "Technical Guidelines for the Construction of Non-stick Wheel Emulsified Asphalt Adhesive Layers". Figure 3 ) The specific test steps are as follows:

[0072] 1) According to the current "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering" (JTG E20), the AC20 asphalt mixture rutting plate was prepared using a rutting machine;

[0073] 2) Clean the surface of the rutting plate to ensure that there is no oil, water, etc. on the surface;

[0074] 3) Apply the non-stick wheel emulsified asphalt evenly on the surface of the asphalt rutting plate, with a coating amount of 0.45kg / m 2 ;

[0075] 4) Place the rutting board in a 60°C oven for curing for 6 hours.

[0076] 5) Wipe the two rubber rings on the sticky wheel tester to make sure they are clean.

[0077] 6) Align the rutting plate with the sloped section of the tester, release the tester, and roll it over the surface of the rutting plate.

[0078] 7) Visually check whether the rubber ring is sticky with asphalt (such as Figure 4 ), the same test piece is rolled 3 times, if there are two non-stick wheels, it is judged as a non-stick wheel.

[0079] In addition, a hard asphalt-type non-stick wheel emulsified asphalt and a common sticky layer oil emulsified asphalt were selected for comparison, and the test results are shown in Table 1 below: Among them, the hard asphalt admixture is a high modulus masterbatch produced by Luoyang Petrochemical Engineering Company, and the preparation method of the non-stick wheel emulsified asphalt is:

[0080] The non-stick wheel emulsified asphalt of the hard asphalt type is prepared according to the following mass percentages: 50% of hard asphalt, 0.4% of emulsifier, 2.0% of stabilizer, 0.35% of thickener, and the balance is water; wherein the hard asphalt is prepared from a hard asphalt admixture and a base asphalt, and the hard asphalt admixture accounts for 40% of the base asphalt;

[0081] Preparation of hard asphalt: preheat the base asphalt to 170°C, add the hard asphalt admixture to the base asphalt in proportion, the addition amount is 40%, shear mix at a low speed of 3000r / min for 60min to obtain hard asphalt, adjust the temperature of the hard asphalt to 165°C and set aside.

[0082] Preparation of non-stick wheel emulsified asphalt: preheat water to 50°C, add emulsifier, stabilizer and thickener aqueous solution into water, the concentration of thickener aqueous solution is 2%, stir evenly at a stirring rate of 2000r / min, adjust the pH value of soap solution to 1.8, and adjust the soap solution temperature to 60°C. Among them, the emulsifier is REDICOTE E-4819 produced by AkzoNobel, the dosage is 0.4%, the stabilizer is CaCl2, the dosage is 2%, and the thickener is methyl cellulose, the dosage is 0.35%. The hard asphalt is dispersed and ground by colloid mill to prepare non-stick wheel emulsified asphalt.

[0083] The preparation method of common tack oil emulsified asphalt is:

[0084] Ordinary tack oil emulsified asphalt is prepared according to the following mass percentages: 50% base asphalt, 0.7% emulsifier, 2.0% stabilizer, 0.35% thickener, 2% SBR latex, and the balance is water.

[0085] Preheat water to 50°C, add emulsifier, stabilizer and thickener aqueous solution to water, the concentration of thickener aqueous solution is 2%, stir evenly at a stirring rate of 2000r / min, adjust the pH value of soap solution to 1.8, and adjust the temperature of soap solution to 60°C. Among them, the emulsifier is M331-1M produced by Shandong Paini Company, the dosage is 0.7%, the stabilizer is CaCl2, the dosage is 2%, and the thickener is methyl cellulose, the dosage is 0.35%. Adjust the temperature of the base asphalt to 155°C, and transport the base asphalt and soap solution to the colloid mill, disperse and grind them in the colloid mill to prepare emulsified asphalt. Add 2% SBR latex to the emulsified asphalt produced, stir for 20 minutes at a stirring rate of 2000r / min, stir evenly, and prepare ordinary tack oil emulsified asphalt.

[0086] Table 1 Summary of test results of non-stick wheel emulsified asphalt performance

[0087]

[0088] As can be seen from Table 1, Examples 1-4 of the present application all exhibit excellent road performance and high-temperature non-stick wheel characteristics. The technical solution provided by the examples can effectively solve the problem of ordinary sticky layers adhering to wheels. While ensuring high-temperature non-stick wheels, compared with ordinary sticky layers, road performance is comprehensively improved, especially high and low temperature performance, pull-out strength and shear strength. The bonding strength and shear strength are improved by more than 50%, which improves the durability of asphalt pavement. Compared with similar hard asphalt non-stick wheel emulsified asphalt products, the low-temperature performance is significantly improved, and the ductility at 5°C is greater than 30cm.

[0089] Examples 1-3 changed the dosage of water-based high molecular polymers, and Example 4 changed the type of emulsifier. The present invention combines emulsified modified asphalt technology with water-based high molecular polymer modification technology to achieve improvements in the high and low temperature performance, bonding strength and shear strength of emulsified asphalt. By adding co-solvent materials, asphalt is easier to emulsify and has almost no effect on road performance, reducing the requirements for emulsifiers, and the produced emulsified asphalt has better storage stability. Adjusting the dosage ratio of water-based high molecular polymers will change the high and low temperature performance, bonding strength, shear strength and non-stick wheel effect of emulsified asphalt, and will increase with the increase in dosage. In later applications, appropriate adjustments can be made in combination with specific technical requirements to achieve the maximum economic benefit ratio.

[0090] It should be noted that the above examples are only preferred specific implementation methods of the present invention, and the above description is illustrative rather than exhaustive, but the protection scope of the present invention is not limited thereto. Without departing from the scope and spirit of the described embodiments, any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A non-stick wheel emulsified asphalt with a thin layer of overlay tack oil based on asynchronous construction, characterized in that: The invention is prepared from the following raw materials by mass percentage: 50% to 55% of SBS and base asphalt, 0.1% to 0.5% of cosolvent, 0.4% to 1.0% of emulsifier, 1.0% to 2.0% of stabilizer, 0.3% to 0.5% of thickener, 4% to 10% of water-based high molecular polymer, and the balance is water; wherein, SBS accounts for 3% to 5.5% of the mass of the base asphalt; The water-based high molecular polymer is a silicone-hybrid ketone carbonyl compound latex, and the silicone-hybrid ketone carbonyl compound latex is LINTEC EP-803 produced by Hunan Linte Technology Co., Ltd.; The emulsifier is one or more of REDICOTE E-4819 produced by AkzoNobel of the Netherlands, AA-63D produced by Ingevity of the United States, and A9 produced by Shandong Shengquan New Materials Co., Ltd.

2. The non-stick wheel emulsified asphalt according to claim 1, characterized in that: The cosolvent is one or more of ethylene glycol, propylene glycol, isopropanol, dipropylene glycol butyl ether and butyl carbitol.

3. The non-stick wheel emulsified asphalt according to claim 1, characterized in that: The base asphalt is road petroleum asphalt.

4. The non-stick wheel emulsified asphalt according to claim 1, characterized in that: The stabilizer is one or more of CaCl2, NaCl or NH4Cl.

5. The non-stick wheel emulsified asphalt according to claim 1, characterized in that: The thickener is one or more of methyl cellulose, hydroxymethyl cellulose, hydroxyethyl cellulose or methyl hydroxyethyl cellulose.

6. The non-stick wheel emulsified asphalt according to claim 1, characterized in that: The softening point of the evaporation residue of the non-stick wheel emulsified asphalt is greater than 70°C, the elongation at 5°C is greater than 30cm, the pull-out strength of the interlayer adhesive oil is greater than 0.5Mpa, and the shear strength is greater than 1.1MPa.

7. A method for preparing non-stick wheel emulsified asphalt with a thin layer of overlay tack oil based on asynchronous construction as described in any one of claims 1 to 6, characterized in that: The steps include: Step 1: preheat the base asphalt to 170°C-180°C, add SBS and co-solvent to the base asphalt in proportion, pass through an asphalt colloid mill, shear and mix at a speed of 1000-3000 r / min for 15-20 minutes, and then high-speed shear at a speed of 4500-5500 r / min for 30-45 minutes to obtain modified asphalt; Control the temperature of modified asphalt to 155℃~165℃ and set aside; Step 2: Heat water to 45-55°C, add emulsifier, stabilizer and thickener aqueous solution into the water, the mass concentration of thickener aqueous solution is 1-4%, stir evenly to obtain soap solution; adjust the pH value of the soap solution to 1.5-2.5, heat the soap solution to 50-60°C, and set aside; Step 3: transporting the prepared modified asphalt and soap solution to a colloid mill, and evenly dispersing and grinding them in the colloid mill to form an oil-in-water emulsion to prepare an emulsified modified asphalt; Step 4: When the temperature of the emulsified modified asphalt drops to room temperature, add the water-based high molecular polymer into the emulsified modified asphalt, and stir for 15min to 45min at a stirring rate of 1000 to 3000r / min to prepare the non-stick wheel emulsified asphalt.

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