Composite modified emulsified asphalt as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of pavement engineering materials, and particularly relates to composite modified emulsified asphalt as well as a preparation method and application thereof. The invention provides a preparation method of composite modified emulsified asphalt. The preparation method comprises the following steps: (1) preparing composite modified asphalt: carrying out first heating on matrix asphalt, adding an elastic agent, raising the temperature for development, then adding a viscosity modifier and a dispersant, carrying out first shearing, then adding a tackifier, a plasticizer, a coupling agent and a stabilizer, and carrying out second shearing; (2) preparing liquid soap; and (3) cooling the composite modified asphalt, mixing with liquid soap, and grinding colloid. The prepared composite modified emulsified asphalt is higher in bonding strength, softening point and dynamic viscosity, lower in needle penetration and better in high-temperature performance; the ductility at 5 DEG C is high, the low-temperature performance is better, and the anti-cracking and anti-stripping performance and the durability are excellent.

Description

Technical Field

[0001] The present invention belongs to the technical field of pavement engineering materials, and particularly relates to a composite modified emulsified asphalt, a preparation method thereof and an application thereof. Background Art

[0002] Modified emulsified asphalt is a pavement engineering material with wide application, mature technology and stable performance, and is widely used in the construction and maintenance projects of various pavements. At present, the modified emulsified asphalt on the market is mainly modified with SBR, which has the advantages of simple production, convenient construction and low cost; however, it also has defects such as poor high-temperature performance, poor durability, easy cracking and peeling, and large driving noise. In view of the above defects, on the market, methods such as incorporating high-performance modified materials or increasing the solid content are adopted to prepare high-viscosity modified emulsified asphalt to improve the road performance of asphalt mixtures, but the preparation method is complex, and problems such as low bond strength, softening point and dynamic viscosity or high penetration of asphalt may occur, and the high-temperature performance of asphalt is poor; or the ductility decreases at low temperature (5°C), and the low-temperature performance is poor; the existing asphalt cannot have good high-temperature performance and low-temperature performance at the same time. Summary of the Invention

[0003] Therefore, the technical problem to be solved by the present invention is to overcome the defects that the preparation method of the modified emulsified asphalt in the prior art is complex, and the prepared modified emulsified asphalt cannot have good bond strength, penetration, softening point, dynamic viscosity and low-temperature (5°C) ductility and other properties at the same time, and cannot balance the high-temperature performance and low-temperature performance, so as to provide a composite modified emulsified asphalt, a preparation method thereof and an application thereof.

[0004] The composite modified emulsified asphalt provided by the present invention has excellent high-temperature performance, low-temperature performance, anti-cracking and peeling performance and durability at the same time.

[0005] For this purpose, the present invention provides the following technical solutions.

[0006] The present invention provides a preparation method of a composite modified emulsified asphalt, comprising the following steps:

[0007] (1) Prepare composite modified asphalt: heat the base asphalt for the first time, add an elasticizer and raise the temperature for development, then add a viscosity regulator and a dispersant, perform the first shearing, and then add a tackifier, a plasticizer, a coupling agent and a stabilizer, and perform the second shearing;

[0008] (2) Prepare soap solution;

[0009] (3) After the composite modified asphalt is cooled, mix it with the soap solution and perform colloid grinding.

[0010] The elasticizer is an additive used to improve the elasticity and deformation resistance of asphalt materials; it includes polymer elasticizers, rubber elasticizers, and chemically modified elasticizers; when preparing asphalt mixtures, the elasticizer can enhance the durability, crack resistance, and 5°C ductility of the road surface.

[0011] In an alternative embodiment, the mass ratio of the base asphalt, elasticizer, viscosity regulator, dispersant, tackifier, plasticizer, coupling agent, and stabilizer is (70 - 90):(4 - 8.5):(5 - 20):(1 - 2):(0.5 - 2):(1 - 2):(1 - 2):(1 - 2);

[0012] Preferably, the mass ratio of the base asphalt, elasticizer, viscosity regulator, dispersant, tackifier, plasticizer, coupling agent, and stabilizer is (70 - 90):(4 - 8):(5 - 20):(1 - 2):(1 - 2):(1 - 2):(1 - 2):(1 - 2);

[0013] In an alternative embodiment, the temperature of the first heating is 140 - 160°C;

[0014] Preferably, the temperature of the first heating is 140 - 150°C;

[0015] In an alternative embodiment, the time of the first heating is 3 - 4h;

[0016] In an alternative embodiment, the temperature of the temperature rise and development is 180 - 190°C;

[0017] In an alternative embodiment, the time of the temperature rise and development is 45 - 60min;

[0018] Preferably, the time of the temperature rise and development is 45 - 50min;

[0019] In an alternative embodiment, the speed of the first shearing is 6000 - 8000r / min;

[0020] Preferably, the speed of the first shearing is 7500 - 8000r / min;

[0021] In an alternative embodiment, the time of the first shearing is 20 - 40min;

[0022] Preferably, the time of the first shearing is 35 - 40min;

[0023] In an alternative embodiment, the speed of the second shearing is 2000 - 3000r / min;

[0024] Preferably, the speed of the second shearing is 2500 - 3000 r / min;

[0025] In an alternative embodiment, the time of the second shearing is 10 - 20 min.

[0026] In an alternative embodiment, the base asphalt includes at least one of 50# petroleum asphalt, 70# petroleum asphalt, and 90# petroleum asphalt;

[0027] Preferably, the base asphalt is 70# petroleum asphalt;

[0028] In an alternative embodiment, the elasticizer includes SBS;

[0029] Preferably, the elasticizer includes at least one of star-shaped SBS particles and linear SBS particles;

[0030] Preferably, the elasticizer is linear SBS particles;

[0031] In an alternative embodiment, the tackifier includes epoxy resin;

[0032] Preferably, the tackifier includes at least one of waterborne epoxy resin and oil-based epoxy resin;

[0033] Preferably, the tackifier is waterborne epoxy resin;

[0034] Adding an elasticizer and a tackifier can change the molecular composition of the base asphalt and improve the mechanical and viscosity properties of the asphalt;

[0035] In an alternative embodiment, the viscosity modifier includes at least one of silicone oil, rubber oil, and naphthenic oil; Adding a viscosity modifier can reduce the interfacial viscosity of the asphalt, improve the rheological properties of the asphalt, and reduce the emulsification difficulty; It can also improve the dispersibility of the asphalt;

[0036] Preferably, the viscosity modifier is naphthenic oil;

[0037] In an alternative embodiment, the dispersant includes at least one of diatomaceous earth, bentonite, and talc powder;

[0038] Preferably, the particle size of the dispersant is greater than 500 mesh;

[0039] Preferably, the dispersant is diatomaceous earth;

[0040] Preferably, the dispersant is 1500-mesh diatomaceous earth.

[0041] In an alternative embodiment, the plasticizer includes at least one of synthetic plant ester, dioctyl maleate, and dioctyl phthalate; adding a dispersant and a plasticizer can improve the dispersion uniformity of the plasticizer and avoid segregation and agglomeration problems caused by excessive incorporation of the plasticizer;

[0042] Preferably, the plasticizer is synthetic plant ester;

[0043] In an alternative embodiment, the coupling agent includes cetyltrimethylammonium bromide; adding a coupling agent enhances the chemical interaction between the composite modified asphalt and the emulsifier, improves the compatibility between the composite modified asphalt and the emulsifier, and reduces the emulsification difficulty of the composite modified asphalt;

[0044] In an alternative embodiment, the stabilizer includes sulfur powder; adding a stabilizer improves the intercalation structure of the modified asphalt and enhances the storage stability.

[0045] Preferably, the particle size of the stabilizer is larger than 300 mesh.

[0046] Preferably, the stabilizer is 800-mesh sulfur powder;

[0047] In an alternative embodiment, the steps for preparing the soap solution include: heating water to 70 - 90 °C, adding an emulsifier, adjusting the pH value, and stirring evenly to obtain the soap solution.

[0048] Preferably, the steps for preparing the soap solution include: heating water to 70 - 75 °C, adding an emulsifier, adjusting the pH value, and stirring evenly to obtain the soap solution.

[0049] In an alternative embodiment, the mass ratio of the base asphalt, water, and emulsifier is (70 - 90):(40 - 50):(1 - 2);

[0050] In an alternative embodiment, the pH regulator for adjusting the pH value includes sulfuric acid;

[0051] Preferably, the concentration of the sulfuric acid is 97 - 99%;

[0052] In an alternative embodiment, the emulsifier includes at least one of quaternary ammonium salts, amides, and sodium lignosulfonate;

[0053] Preferably, the emulsifier is sodium lignosulfonate;

[0054] In an alternative embodiment, the pH value is 1.8 - 2.2.

[0055] In an alternative embodiment, the temperature after cooling is 130 - 140 °C;

[0056] In an alternative embodiment, the temperature of the colloid milling is 50 - 70 °C;

[0057] Preferably, the temperature of the colloid milling is 65 - 70 °C;

[0058] In an alternative embodiment, the rotation speed of the colloid milling is 3000 - 5000 r / min;

[0059] Preferably, the rotation speed of the colloid milling is 3700 - 4300 r / min;

[0060] Preferably, the speed of the second shearing and the preferred temperature and preferred rotation speed of the colloid milling have a synergistic effect, which can further improve the dynamic viscosity and softening point of the asphalt, reduce the penetration, and improve the high-temperature performance; and increase the cohesion of the prepared asphalt mixture, reduce the load wheel sand sticking amount and wet wheel abrasion, and improve the durability, high-temperature stability, and anti-loosening and anti-stripping abilities of the asphalt mixture.

[0061] In an alternative embodiment, the time of the colloid milling is 5 - 20 min.

[0062] The present invention also provides a composite modified emulsified asphalt prepared by the above preparation method.

[0063] The present invention also provides an application of the composite modified emulsified asphalt prepared by the above preparation method in pavement engineering materials.

[0064] When the composite modified asphalt prepared by the present invention is mixed with an emulsifier, it is easy to be emulsified, further improving the storage stability and facilitating construction.

[0065] The technical solution of the present invention has the following advantages:

[0066] 1. The preparation method of the composite modified emulsified asphalt provided by the present invention includes the following steps: (1) Prepare the composite modified asphalt: heat the matrix asphalt for the first time, add an elasticizer and raise the temperature for development, then add a viscosity regulator and a dispersant, perform the first shearing, and then add a thickening agent, a plasticizer, a coupling agent, and a stabilizer, and perform the second shearing; (2) Prepare the soap solution; (3) After the composite modified asphalt is cooled, mix it with the soap solution and perform colloid milling. The composite modified emulsified asphalt prepared by the present invention has higher bond strength, softening point, and dynamic viscosity, lower penetration, and better high-temperature performance; it has a high ductility at 5 °C, better low-temperature performance, and excellent anti-cracking and anti-stripping performance and durability; it is convenient for construction. The pavement paved with the mixture prepared by mixing the prepared composite modified emulsified asphalt and aggregates can have excellent high-temperature stability, water damage resistance, and durability, good flatness while being easy to construct, reduce road surface noise, and have good driving comfort;

[0067] The present invention prepares the composite modified asphalt step by step, enabling the additives to be better dispersed in the asphalt, refining the particles, allowing the asphalt and the additives to react fully without overreacting, reducing local property differences (local softening or hardening) caused by uneven reaction, improving compatibility, reducing raw material waste, and increasing utilization rate. The preparation method is simple, and the obtained composite modified emulsified asphalt has excellent bond strength, penetration, softening point, kinematic viscosity, ductility at 5°C, anti-cracking and stripping performance, and durability. At the same time, segmented shearing avoids the high energy required for one-time shearing, reducing energy consumption.

[0068] 2. For the preparation method of the composite modified emulsified asphalt provided by the present invention, first cool the composite modified asphalt to 130 - 140°C, and then mix it with the soap solution to obtain the composite modified emulsified asphalt, further improving the bond strength, softening point, kinematic viscosity, and ductility at 5°C of the composite modified emulsified asphalt, reducing the penetration, optimizing the microstructure of the asphalt. The improvement of the ductility at 5°C enables the composite modified emulsified asphalt to have good flexibility and anti-cracking performance at low temperatures. And the obtained composite modified emulsified asphalt has a moderate viscosity, and through the grinding and dispersion device, it is uniformly sheared and dispersed, further improving the emulsification effect. It also reduces the oxidation and aging of the asphalt at high temperatures, prolongs the service life, reduces the release of harmful substances, protects the environment, reduces energy consumption, reduces the construction difficulty, and improves the efficiency.

[0069] The present invention adds a stabilizer, sulfur powder. The sulfur powder undergoes a vulcanization reaction with the double bonds in the elastomer (SBS particles) to form a three-dimensional network structure, reducing the separation of SBS particles from the asphalt, prolonging the storage time of the emulsified asphalt, and adjusting the interfacial tension between the emulsifier and the asphalt to prevent the emulsion from breaking and delaminating. The asphalt with added sulfur powder has a stronger rigid network structure, a higher softening point, thereby reducing the flow deformation at high temperatures. It also enhances the elastic recovery ability of the asphalt. The formed three-dimensional network structure disperses stress more evenly, which can delay the propagation of microcracks and extend the service life of the road. The addition of sulfur powder can also improve the modification efficiency of SBS, reduce the SBS addition amount. Moreover, sulfur powder has a wide source, low cost, and can be recycled, saving costs and protecting the environment.

[0070] Preferably, the stabilizer is 800-mesh sulfur powder, the vulcanization reaction is more complete, the formed three-dimensional network structure is denser, and the high-temperature stability is better.

[0071] Preferably, the elasticizer is linear SBS particles; linear SBS particles have better low-temperature and elastic properties and are easy to process; their unique stretching and retracting characteristics endow asphalt with self-healing ability, reducing fatigue damage under repeated loads; moreover, they have a simple structure, are easier to shear and disperse, form uniform particles, avoid agglomeration, have a low melt viscosity, better compatibility with emulsifiers, extend the storage period of asphalt, and have low requirements for equipment; linear SBS particles are cheaper than star-shaped SBS particles and have a smaller addition amount, effectively controlling costs.

[0072] Waterborne epoxy resin does not contain organic solvents, can significantly reduce the release of volatile organic compounds, and reduce pollution; it has a short curing time, can quickly form a waterproof layer, improve construction efficiency, supports various construction methods such as brushing and spraying, and is easy to operate; the molecular structure of the composite modified emulsified asphalt added with waterborne epoxy resin is stable, and the waterproof effect is still maintained after long-term immersion, and it has excellent anti-ultraviolet, temperature change resistance and anti-fatigue capabilities, suitable for complex climate environments; it has a high safety factor, no flammable solvents can reduce the fire risk, and the cured waterproof layer has flame retardancy, further ensuring and improving the safety performance.

[0073] Preferably, the dispersant is diatomite with 1500 mesh, which has a larger specific surface area, uniformly adsorbs other components in the composite modified asphalt, prevents agglomeration, and further improves the high-temperature performance, low-temperature performance, anti-cracking and spalling performance and durability of the composite modified emulsified asphalt. Specific embodiments

[0074] The following embodiments are provided to better further understand the present invention, which are not limited to the best embodiments, and do not constitute a limitation to the content and protection scope of the present invention. Any product identical or similar to the present invention obtained by anyone under the inspiration of the present invention or by combining the features of the present invention with other prior art features falls within the protection scope of the present invention.

[0075] For those not specifying specific experimental steps or conditions in the embodiments, the operations or conditions of the conventional experimental steps described in the literature in this field can be followed. For the reagents or instruments not indicating the manufacturer, they are all conventional reagent products that can be obtained through commercial purchase.

[0076] Example 1

[0077] This example provides a preparation method of a composite modified high-viscosity emulsified asphalt, including the following steps:

[0078] (1) By mass fraction, heat 78 parts of 70# base asphalt in a heating box at 145 °C for 3 h, add 6 parts of linear SBS particles (Dongguan Yikai Plastic Raw Materials Co., Ltd., YH-140), and raise the temperature to 180 °C. Develop at 180 °C for 45 min to obtain the first mixture; add 10 parts of naphthenic oil (Hengshui Diyi Petrochemical Co., Ltd., 4010) and 2 parts of 1500-mesh diatomite to the first mixture, and shear with a high-speed shearer at 8000 r / min for 40 min to obtain the second mixture; add 1 part of waterborne epoxy resin (Hubei Bast Technology Co., Ltd., BER1398), 1 part of synthetic plant ester (Shandong Guohua Chemical Co., Ltd., ATBC), 1 part of cetyltrimethylammonium bromide, and 1 part of 800-mesh sublimed sulfur powder to the second mixture, and shear at 3000 r / min for 20 min to obtain the compound modified high-viscosity asphalt;

[0079] (2) Heat 40 parts of water to 70 °C, add 1 part of sodium lignosulfonate (Hubei Shineng Chemical Technology Co., Ltd., CAS8061-51-6), add sulfuric acid (98% analytical pure) to adjust the pH value to 1.8 - 2.2, and stir evenly to obtain the soap solution;

[0080] (3) Lower the temperature of the compound modified high-viscosity asphalt to 140 °C, set the temperature of the colloid mill to 70 °C, and add the soap solution and the compound modified high-viscosity asphalt to the colloid mill and shear and grind at 4000 r / min for 10 min to obtain the compound modified high-viscosity emulsified asphalt.

[0081] Example 2

[0082] This example provides a preparation method of compound modified high-viscosity emulsified asphalt, including the following steps:

[0083] (1) By mass fraction, heat 84 parts of 70# base asphalt in a heating box at 145 °C for 3 h, add 3 parts of linear SBS particles (Dongguan Yikai Plastic Raw Materials Co., Ltd., YH-140), and raise the temperature to 180 °C. Develop at 180 °C for 45 min to obtain the first mixture; add 8.5 parts of naphthenic oil (Hengshui Diyi Petrochemical Co., Ltd., 4010) and 1 part of 1500-mesh diatomite to the first mixture, and shear with a high-speed shearer at 8000 r / min for 40 min to obtain the second mixture; add 0.5 part of waterborne epoxy resin (Hubei Bast Technology Co., Ltd., BER1398), 1 part of synthetic plant ester (Shandong Guohua Chemical Co., Ltd., ATBC), 1 part of cetyltrimethylammonium bromide, and 1 part of 800-mesh sublimed sulfur powder to the second mixture, and shear at 3000 r / min for 20 min to obtain the compound modified high-viscosity asphalt;

[0084] (2) Heat 40 parts of water to 70°C, add 1 part of sodium lignin sulfonate (Hubei Shineng Chemical Technology Co., Ltd., CAS8061-51-6), add sulfuric acid (98% analytical grade) to adjust the pH value to 1.8-2.2, and stir evenly to obtain a soap solution;

[0085] (3) The temperature of the composite modified high-viscosity asphalt was lowered to 140°C, the temperature of the colloid mill was set to 70°C, the soap solution and the composite modified high-viscosity asphalt were added to the colloid mill and sheared and ground at 4000 r / min for 10 minutes to obtain the composite modified high-viscosity emulsified asphalt.

[0086] Example 3

[0087] This embodiment provides a method for preparing a composite modified high-viscosity emulsified asphalt, comprising the following steps:

[0088] (1) In terms of mass, 70 parts of 70# matrix asphalt were heated in a heating box at 145°C for 3 h, 8 parts of linear SBS particles (Dongguan Yikai Plastic Raw Materials Co., Ltd., YH-140) were added and the temperature was raised to 180°C, and the mixture was grown at 180°C for 45 min to obtain a first mixture; 13 parts of cyclohexane oil (Hengshui Diyi Petrochemical, 4010) and 2 parts of 1500 mesh diatomaceous earth were added to the first mixture, and the mixture was sheared at 8000 r / min for 40 min to obtain a second mixture; 1 part of water-based epoxy resin (Hubei Bast Technology Co., Ltd., BER1398), 2 parts of synthetic plant ester (Shandong Guohua Chemical Co., Ltd., ATBC), 2 parts of hexadecyltrimethylammonium bromide, and 2 parts of 800 mesh sublimed sulfur powder were added to the second mixture, and the mixture was sheared at 3000 r / min for 20 min to obtain a composite modified high-viscosity asphalt;

[0089] (2) Heat 40 parts of water to 70°C, add 1 part of sodium lignin sulfonate (Hubei Shineng Chemical Technology Co., Ltd., CAS8061-51-6), add sulfuric acid (98% analytical grade) to adjust the pH value to 1.8-2.2, and stir evenly to obtain a soap solution;

[0090] (3) The temperature of the composite modified high-viscosity asphalt was lowered to 140°C, the temperature of the colloid mill was set to 70°C, the soap solution and the composite modified high-viscosity asphalt were added to the colloid mill and sheared and ground at 4000 r / min for 10 minutes to obtain the composite modified high-viscosity emulsified asphalt.

[0091] Example 4

[0092] This embodiment provides a method for preparing a composite modified high-viscosity emulsified asphalt. Compared with Example 1, the difference is that in step (1), shearing at 2000 r / min for 10 min replaces shearing at 3000 r / min for 20 min in Example 1;

[0093] Step (3): Lower the temperature of the compound modified high-viscosity asphalt to 140°C, set the temperature of the colloid mill to 60°C, add the soap solution and the compound modified high-viscosity asphalt to the colloid mill, and shear and grind at 3000 r / min for 5 min to obtain the compound modified high-viscosity emulsified asphalt.

[0094] Example 5

[0095] This example provides a preparation method of compound modified high-viscosity emulsified asphalt, including the following steps:

[0096] (1) By mass, heat 90 parts of 90# base asphalt in a heating box at 160°C for 4 h, add 4 parts of star-shaped SBS particles (Dongguan Yikai Plastic Raw Materials Co., Ltd., YH-188) and raise the temperature to 190°C, develop at 190°C for 60 min to obtain the first mixture; add 20 parts of rubber oil and 2 parts of 800-mesh talc powder to the first mixture, and shear at 6000 r / min with a high-speed shear for 20 min to obtain the second mixture; add 1 part of oil-based epoxy resin, 1 part of dioctyl phthalate, 1 part of cetyltrimethylammonium bromide, and 1 part of 300-mesh sublimed sulfur powder to the second mixture, and shear at 2000 r / min for 10 min to obtain the compound modified high-viscosity asphalt;

[0097] (2) Heat 50 parts of water to 90°C, add 2 parts of cetyltrimethylammonium bromide (CTAB), add sulfuric acid (98% analytical pure) to adjust the pH value to 1.8 - 2.2, and stir evenly to obtain the soap solution;

[0098] (3) Lower the temperature of the compound modified high-viscosity asphalt to 130°C, set the temperature of the colloid mill to 50°C, add the soap solution and the compound modified high-viscosity asphalt to the colloid mill, and shear and grind at 5000 r / min for 20 min to obtain the compound modified high-viscosity emulsified asphalt.

[0099] Comparative Example 1

[0100] This comparative example is a commercially available SBS single modified emulsified asphalt.

[0101] Comparative Example 2

[0102] This comparative example provides a preparation method of modified emulsified asphalt, including the following steps:

[0103] (1) By mass, heat 78 parts of 70# base asphalt in a heating box at 145°C for 3 h, shear at 8000 r / min with a high-speed shear for 40 min, add 6 parts of linear SBS particles, 10 parts of naphthenic oil, 2 parts of 1500-mesh diatomaceous earth, 1 part of water-based epoxy resin, 1 part of synthetic plant ester, 1 part of cetyltrimethylammonium bromide, and 1 part of 800-mesh sublimed sulfur powder and mix, raise the temperature to 180°C, and develop at 180°C for 45 min;

[0104] (2) Heat 40 parts of water to 70 °C, add 1 part of emulsifier, add sulfuric acid (concentration) to adjust the pH value to 2, and obtain a soap solution after stirring evenly;

[0105] (3) Lower the temperature of the composite modified high-viscosity asphalt to 140 °C, set the temperature of the colloid mill to 70 °C, add the soap solution and the composite modified high-viscosity asphalt to the colloid mill, and shear and grind at 4000 r / min for 10 min to obtain modified emulsified asphalt.

[0106] Comparative Example 3

[0107] This comparative example provides a preparation method of modified emulsified asphalt, including the following steps:

[0108] (1) By mass, heat 78 parts of 70# base asphalt in a heating box at 145 °C for 3 h, add 6 parts of linear SBS particles and raise the temperature to 180 °C, and develop at 180 °C for 45 min to obtain a first mixture; add 10 parts of naphthenic oil and 2 parts of 1500-mesh diatomite to the first mixture, and shear at 8000 r / min with a high-speed shear instrument for 40 min to obtain a second mixture; add 1 part of waterborne epoxy resin, 1 part of synthetic plant ester, 1 part of cetyltrimethylammonium bromide, and 1 part of 800-mesh sublimed sulfur powder to the second mixture, and shear at 3000 r / min for 20 min to obtain composite modified high-viscosity asphalt;

[0109] (2) Heat 40 parts of water to 70 °C, add 1 part of emulsifier, add sulfuric acid (concentration) to adjust the pH value to 2, and obtain a soap solution after stirring evenly;

[0110] (3) Without lowering the temperature of the composite modified high-viscosity asphalt, set the temperature of the colloid mill to 70 °C, directly add the soap solution and the above-prepared composite modified high-viscosity asphalt to the colloid mill, and shear and grind at 4000 r / min for 10 min to obtain modified emulsified asphalt.

[0111] Test Example

[0112] Perform performance tests (adhesion strength is tested by pull-out test) on the modified emulsified asphalt prepared in the above examples and comparative examples according to JTG E20—2011 "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering", and the results are shown in Table 1-2.

[0113] Make asphalt mixtures from the modified emulsified asphalt prepared in the above examples and comparative examples according to the asphalt mixture specimen preparation method in JTG E20—2011 "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering", and perform performance tests according to JTG E20—2011 "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering", and the results are shown in Table 3.

[0114] Table 1 Asphalt Test Results 1

[0115]

[0116] Table 2 Asphalt Test Results 2

[0117]

[0118]

[0119] Table 3 Asphalt Mixture Test Results

[0120]

[0121] As can be seen from Tables 1 - 3, the composite modified high-viscosity emulsified asphalt prepared by the present invention has excellent high-temperature performance, low-temperature performance, anti-cracking and spalling performance, and durability. From the bond strength, penetration, softening point, and kinematic viscosity, it can be seen that the composite modified high-viscosity emulsified asphalt has excellent high-temperature performance; specifically, a high bond strength has stronger cohesion and structural stability, can be stably used at high temperatures, and avoids adverse phenomena such as structural instability, increased deformation, and interface peeling caused by low bond strength at high temperatures; a low penetration makes the asphalt structure more compact and does not have problems such as a decrease in viscosity and an increase in fluidity at high temperatures; a high softening point has stronger anti-deformation ability and dynamic stability at high temperatures, and can also have more excellent durability and anti-aging performance; a high kinematic viscosity is not prone to plastic flow at high temperatures, reducing the attenuation rate.

[0122] A high ductility at 5°C indicates excellent low-temperature performance and anti-cracking and spalling performance. It can still undergo large plastic deformation at 5°C, absorb stress, delay crack generation, and prevent adverse phenomena such as fracture; the asphalt mixture prepared with the composite modified high-viscosity emulsified asphalt prepared by the present invention has good wet wheel abrasion performance, indicating excellent water damage resistance ability, and further indicating good durability; a large cohesion indicates that it can be cured and put into use quickly, saving construction time; a small amount of load wheel sand sticking can effectively control the upper limit of asphalt use in the mixture, improving the high-temperature stability, anti-loosening, and anti-spalling ability of the mixture.

[0123] Obviously, the above embodiments are merely examples given for clear illustration and not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or variations can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. And the obvious changes or variations derived therefrom are still within the protection scope of the present invention.

Claims

1. A preparation method of a composite modified emulsified asphalt, characterized in that, It includes the following steps: (1) Prepare the composite modified asphalt: First heat the base asphalt, add the elasticizer and raise the temperature for development, then add the viscosity regulator and dispersant, perform the first shearing, and then add the tackifier, plasticizer, coupling agent and stabilizer, and perform the second shearing; (2) Prepare the soap solution; (3) After the composite modified asphalt cools down, mix it with the soap solution and perform colloid grinding.

2. The preparation method according to claim 1, wherein, The mass ratio of the base asphalt, elasticizer, viscosity regulator, dispersant, tackifier, plasticizer, coupling agent and stabilizer is (70 - 90):(4 - 8.5):(5 - 20):(1 - 2):(0.5 - 2):(1 - 2):(1 - 2):(1 - 2); Preferably, the mass ratio of the base asphalt, elasticizer, viscosity regulator, dispersant, tackifier, plasticizer, coupling agent and stabilizer is (70 - 90):(4 - 8):(5 - 20):(1 - 2):(1 - 2):(1 - 2):(1 - 2):(1 - 2); and / or, The temperature of the first heating is 140 - 160 °C; and / or, The time of the first heating is 3 - 4 h; and / or, The temperature of the temperature rise for development is 180 - 190 °C; and / or, The time of the temperature rise for development is 45 - 60 min; and / or, The speed of the first shearing is 6000 - 8000 r / min; and / or, The time of the first shearing is 20 - 40 min; and / or, The speed of the second shearing is 2000 - 3000 r / min; and / or, The time of the second shearing is 10 - 20 min.

3. The preparation method according to claim 1 or 2, characterized in that, The base asphalt includes at least one of 50# petroleum asphalt, 70# petroleum asphalt and 90# petroleum asphalt; and / or, The elasticizer includes SBS; Preferably, the elasticizer includes at least one of star-shaped SBS particles and linear SBS particles; and / or, The tackifier includes epoxy resin; Preferably, the tackifier includes at least one of waterborne epoxy resin and oil-based epoxy resin; and / or, The viscosity regulator includes at least one of silicone oil, rubber oil and naphthenic oil; and / or, The dispersant includes at least one of diatomite, bentonite and talc powder; and / or, The plasticizer includes at least one of synthetic plant ester, dioctyl maleate and dioctyl phthalate; and / or, The coupling agent includes cetyltrimethylammonium bromide; and / or, The stabilizer includes sulfur powder.

4. The preparation method according to claim 3, characterized in that, The base asphalt is 70# petroleum asphalt; and / or, The elasticizer is linear SBS particles; and / or, The tackifier is waterborne epoxy resin; and / or, The viscosity regulator is naphthenic oil; and / or, The dispersant is diatomite; and / or, The plasticizer is synthetic plant ester; and / or, The particle size of the dispersant is greater than 500 mesh; and / or, The particle size of the stabilizer is greater than 300 mesh.

5. The preparation method according to claim 4, characterized in that, The stabilizer is 800-mesh sulfur powder; and / or, The dispersant is 1500-mesh diatomite.

6. The preparation method according to any one of claims 1-5, characterized in that The steps for preparing the soap solution include: Heat the water to 70 - 90 °C, add the emulsifier, adjust the pH value, and stir evenly to obtain it.

7. The preparation method according to claim 6, characterized in that, The mass ratio of the matrix asphalt, water and emulsifier is (70 - 90):(40 - 50):(1 - 2); and / or, The pH regulator for adjusting the pH value includes sulfuric acid; preferably, the concentration of the sulfuric acid is 97 - 99%; and / or, The emulsifier includes at least one of quaternary ammonium salt, amide, and sodium lignosulfonate; preferably, the emulsifier is sodium lignosulfonate; and / or, The pH value is 1.8 - 2.

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8. The preparation method according to any one of claims 1 to 7, characterized in that, The temperature after cooling is 130 - 140 °C; and / or, The temperature of the colloid grinding is 50 - 70 °C; and / or, The rotation speed of the colloid grinding is 3000 - 5000 r / min; and / or, The time of the colloid grinding is 5 - 20 min.

9. The composite modified emulsified asphalt prepared by the preparation method according to any one of claims 1 - 8.

10. The application of the composite modified emulsified asphalt prepared by the preparation method according to any one of claims 1 - 8 in road engineering materials.

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