Polymer asphalt emulsion, and raw material composition thereof, preparation method therefor and use thereof

Abstract

Disclosed in the present invention are a polymer asphalt emulsion, and a raw material composition thereof, a preparation method therefor and the use thereof. The raw material composition comprises, in parts by weight: 20-100 parts of asphalt, 30-110 parts of a polymerizable monomer, 0.1-1 part of a carboxyl monomer, 0.1-2 parts of a crosslinking monomer, 0.1-2 parts of a functional monomer, 0.2-0.7 parts of an initiator, 1.5-4.5 parts of a surfactant, 1-6 parts of a pH regulator, and 60-80 parts of water. The polymer asphalt emulsion prepared in the present invention is a cationic emulsion, is applicable to cold mix and cold lay asphalt mixtures, allows for a long duration of mixing and construction, and exhibits good cohesion and strong resistance to moisture damage.

Description

A polymeric asphalt emulsion, its raw material composition, its preparation method, and its application.

[0001] This application claims priority to Chinese patent application 2025100754172, filed on January 17, 2025. The entire contents of the aforementioned Chinese patent application are incorporated herein by reference. Technical Field

[0002] This invention belongs to the field of asphalt pavement construction and maintenance technology, specifically relating to a polymer asphalt emulsion, its raw material composition, preparation method and application. Background Technology

[0003] Cold mix asphalt paving is widely used in road maintenance, reinforcement, and reconstruction projects due to its advantages such as convenient construction, low energy consumption, and environmental friendliness. However, conventional anionic polymer emulsions used in cold mix asphalt paving cannot meet the requirements of sufficient mixing time and the road specifications that require mixed emulsified asphalt to be cationic (+) in charge. Existing cold mix processes typically use SBR (styrene-butadiene rubber latex) or SBS (styrene-butadiene-styrene block copolymer) to modify the emulsified asphalt.

[0004] However, the conversion of SBR emulsion from anionic to cationic forms introduces a large amount of high-EO-number nonionic surfactants. The demulsification process is highly dependent on ambient temperature and humidity at the construction site. Excessive surfactant addition can lead to prolonged periods without demulsification, or even difficulty in achieving strength, resulting in poor water resistance later on. The SBS modified asphalt emulsification production process places high demands on modified asphalt production equipment, emulsification equipment, and construction equipment. Furthermore, the poor stability of modified emulsified asphalt significantly limits the application scope of SBS modified asphalt emulsification technology. These problems frequently result in cold-mix cold-pave overlay processes where traffic cannot resume for extended periods after construction, and once traffic resumes, aggregate detachment occurs, sometimes even leading to large-scale peeling within a short period.

[0005] Patent application publication number CN 108530920A discloses a method for improving the performance of cold-mixed and cold-laid asphalt mixtures by adding surfactant-type additives. It evaluates the 2-day and 4-day splitting strength performance of asphalt mixtures. However, in actual road maintenance construction, it is difficult to achieve traffic closure for more than two days, and the large dose of surfactant has a significant impact on the water damage resistance of the mixture.

[0006] Patent application publication number CN114560966A discloses a method for preparing an organosiloxane-modified cationic acrylic emulsion. The cationic surfactant has weak surface activity, and the addition of nonionic surfactants reduces the water resistance. Furthermore, the working time after the quaternary ammonium salt emulsion is mixed with aggregate is very short, and the aggregate compatibility is poor, which cannot meet the mixing and construction requirements of cold-mixed asphalt mixtures. Summary of the Invention

[0007] To address the aforementioned technical problems, this invention proposes a polymeric asphalt emulsion, its raw material composition, preparation method, and application.

[0008] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0009] In one aspect, the present invention provides a raw material composition for a polymeric asphalt emulsion, comprising, by weight:

[0010] 20-100 parts asphalt, 30-110 parts polymerizable monomers, 0.1-1 parts carboxyl monomers, 0.1-2 parts crosslinking monomers, 0.1-2 parts functional monomers, 0.2-0.7 parts initiator, 1.5-4.5 parts surfactant, 1-6 parts pH adjuster, and 60-80 parts water.

[0011] In some embodiments, the asphalt is selected from at least one of petroleum-based asphalt, SBS-modified asphalt, SBR-modified asphalt, and SIS-modified asphalt.

[0012] In some embodiments, the polymerizable monomer is selected from at least one of styrene, acrylamide, methyl acrylate, ethyl acrylate, butyl acrylate, octyl acrylate, 2-ethylhexyl acrylate, nonyl acrylate, decyl acrylate, lauryl acrylate, hydroxyethyl acrylate, hydroxypropyl acrylate, methyl methacrylate, ethyl methacrylate, butyl methacrylate, isooctyl methacrylate, isodecanyl methacrylate, hydroxyethyl methacrylate, hydroxypropyl methacrylate, cyclohexyl acrylate, and cyclohexyl methacrylate. As a further preferred embodiment, the polymerizable monomer does not contain styrene.

[0013] In some embodiments, the carboxyl monomer is selected from at least one of acrylic acid, methacrylic acid, fumaric acid, maleic anhydride, and itaconic acid. As a further preferred embodiment, the carboxyl monomer is methacrylic acid.

[0014] In some embodiments, the crosslinking monomer is selected from at least one of diacetone acrylamide, ethyl acetoacetyl methacrylate, and glycidyl methacrylate. As a further preferred embodiment, the crosslinking monomer is glycidyl methacrylate.

[0015] In some embodiments, the functional monomer is selected from at least one of vinyltriethoxysilane, vinyltrimethoxysilane, and vinyltri(β-methoxyethoxy)silane. As a further preferred embodiment, the functional monomer is vinyltrimethoxysilane.

[0016] In some embodiments, the initiator is selected from at least one of potassium persulfate, sodium persulfate, and ammonium persulfate. As a further preferred embodiment, the initiator is potassium persulfate.

[0017] In some embodiments, the surfactant is selected from at least one of alkylamides, alkyl polyetheramides, alkyl imidazolines, lignin ammonium, alkyl polyoxyethylene ethers, and alkylphenol polyoxyethylene ethers. As a further preferred embodiment, the surfactant is an alkylamide and / or an alkyl imidazoline.

[0018] In some embodiments, the pH adjuster is selected from at least one of hydrochloric acid, nitric acid, sulfuric acid, phosphoric acid, formic acid, and acetic acid. As a further preferred embodiment, the pH adjuster is phosphoric acid.

[0019] In some preferred embodiments, the asphalt is 30 to 70 parts by weight.

[0020] In some preferred embodiments, the polymerizable monomer is 50 to 90 parts by weight.

[0021] In some preferred embodiments, the carboxyl monomer is present in parts by weight of 0.3 to 0.8.

[0022] In some preferred embodiments, the crosslinking monomer is in the form of 0.2 to 1.7 parts by weight.

[0023] In some preferred embodiments, the functional monomer is expressed in parts by weight of 0.3 to 1.7 parts.

[0024] In some preferred embodiments, the initiator is present in parts by weight of 0.3 to 0.5 parts.

[0025] In some preferred embodiments, the surfactant is present in 2 to 3 parts by weight.

[0026] In some preferred embodiments, the pH adjuster is present in 2 to 4 parts by weight.

[0027] In some preferred embodiments, the water is 65 to 75 parts by weight.

[0028] In another aspect, the present invention provides a method for preparing a polymeric asphalt emulsion, wherein the raw materials for the polymeric asphalt emulsion include the above-mentioned raw material composition for polymeric asphalt emulsion, specifically comprising the following steps:

[0029] (1) Mix a portion of surfactant, water, polymerizable monomer, carboxyl monomer, crosslinking monomer and pH adjuster evenly to prepare monomer emulsion;

[0030] (2) Add the remaining surfactant, water and pH adjuster to the reaction vessel, mix well, and prepare a base aqueous solution;

[0031] (3) Take a portion of the monomer emulsion and add it to the base aqueous solution, then add a portion of the initiator, stir, and heat to 80-95°C for heat preservation treatment;

[0032] (4) Take the remaining initiator and water, mix them evenly, and add them dropwise to the reaction vessel along with the remaining monomer emulsion. Stir and add for a period of time. Then add the functional monomer to the monomer emulsion and continue to add. The total addition time is 2.5 to 6 hours. After the addition is completed, keep the mixture warm while stirring to obtain the polymer emulsion.

[0033] (5) Cool down to 45-70°C, add asphalt to the polymer emulsion under shearing or grinding conditions, continue shearing or grinding, cool and filter to obtain polymer asphalt emulsion.

[0034] In step (1), the amount of surfactant is 1.4 to 4.0 parts by weight.

[0035] In step (1), the weight of water is 29 to 35 parts.

[0036] In step (1), the pH adjuster is 0.1 to 0.5 parts by weight.

[0037] In step (2), the pH adjuster is 0.9 to 5.5 parts by weight.

[0038] In steps (1) and (2), the pH adjuster adjusts the pH value in the range of 1 to 7, preferably 2 to 5.

[0039] In step (2), the remaining surfactant is 0.1 to 0.5 parts by weight.

[0040] In step (2), the weight of water is 30 to 40 parts.

[0041] In step (3), the monomer emulsion has a weight ratio of 0 to 5 parts.

[0042] In step (3), the weight of the initiator is 0.1 to 0.2 parts.

[0043] In step (3), the heat preservation treatment time is 5 to 20 minutes.

[0044] In step (4), the remaining initiator is 0.1 to 0.5 parts by weight.

[0045] In step (4), the water is 1 to 5 parts by weight.

[0046] In step (4), the functional monomer is added 0 to 5 hours after the start of the dripping, preferably 2 to 3 hours after the start of the dripping.

[0047] In step (4), the dropping temperature is 80-95℃.

[0048] In step (4), the heat preservation treatment time is 0.5 to 2 hours.

[0049] In step (4), the temperature of the heat preservation treatment is 80-95℃.

[0050] In step (5), the temperature at which the asphalt is added is 110-180°C, preferably 130-160°C.

[0051] In step (5), the time for continued shearing or grinding is 30s to 30min.

[0052] A third aspect of the invention provides a polymeric asphalt emulsion prepared by the method described above for preparing polymeric asphalt emulsions.

[0053] A fourth aspect of the present invention provides the application of polymeric asphalt emulsions in the cold-mix and cold-lay process of asphalt pavement.

[0054] The beneficial effects of this invention are as follows:

[0055] (1) The production process of the polymer asphalt emulsion of the present invention is mild and produces no solvents or other waste. It is a water-based emulsion product that can be applied at room temperature. The ratio of polymer to asphalt in the emulsion can be adjusted over a wide range, making it easy to produce and use.

[0056] (2) In this invention, a pH adjuster is added to the polymer base water and the polymer monomer emulsion, which can improve the emulsifying ability of the surfactant, reduce the amount of emulsifier, and at the same time improve the reactivity of the initiator, making the entire polymerization reaction faster, the polymer monomer reaction more complete, reducing the polymer monomer residue. The cationic (+) charge is conducive to the formation of charge attraction between the polymer emulsion and the negatively charged stone, which is conducive to the spreading and adhesion of polymer particles on the stone surface, and improves the compatibility between polymer asphalt and stone.

[0057] (3) The polymer asphalt emulsion of the present invention is weakly acidic, which can inhibit the hydrolysis of ester groups on polymer chains and promote the ionization of amine or imidazoline groups in surfactants. It can coexist stably with crosslinking groups in polymers. When it comes into contact with a large amount of strong alkaline powders such as cement, mineral powder, and stone during construction, the pH value of the system rises rapidly, catalyzing the crosslinking reaction between crosslinking monomers and amide or imidazoline groups in surfactants. This promotes rapid demulsification of polymer asphalt emulsion to form strength, improves the early strength of the mixture, and reduces the time of road maintenance and traffic closure. The carboxyl groups form ionic bonds with divalent metal ions such as calcium and magnesium ions in fillers to increase the viscosity of emulsified asphalt mortar, thereby increasing the thickness of the single layer that can be constructed and increasing the thickness of the asphalt film on the surface of the upper stone, so that the surface stone adheres more firmly after the mixture is formed and is not easy to fall off.

[0058] (4) The introduction of functional monomers into the polymer emulsion of the present invention can improve the adhesion between polymer asphalt particles and inorganic materials such as stone, improve the water damage resistance of asphalt mixture, reduce the wet wheel wear value of asphalt mixture, and thus improve the service life of the road surface. The functional monomers are added after the polymer reaction has been completed for a certain period of time, which can promote their main distribution on the surface of polymer particles and improve the reaction efficiency between functional monomers and inorganic materials such as stone.

[0059] (5) Conventional polymer-asphalt emulsion modification and mixing involves polymer particles and asphalt particles being independently distributed in the water phase. After demulsification and film formation, only micron-level mixing between different phase interfaces can be achieved. The surfactants used in polymer emulsions are quite different from those used in asphalt emulsions. Mixing the two will affect the stability of the emulsion and seriously interfere with the mixing time, especially when they are mixed in large proportions. This invention uses polymer emulsions to directly emulsify asphalt to form polymer asphalt emulsions, which makes the polymer particles more fully and evenly distributed inside and outside the asphalt particles. After demulsification and film formation, nano-level mixing at the phase interface is achieved, which greatly improves the uniformity of dispersion and avoids segregation caused by density difference. Furthermore, the ratio of polymer to asphalt can be adjusted in large proportions. After the polymer asphalt emulsion is demulsified and formed, the soft and hard monomers of the polymer improve the low-temperature and high-temperature properties of asphalt and expand its application range. The crosslinking monomers form a spatial interpenetrating crosslinking network inside the asphalt binder, which restricts the fluidity of the asphalt and improves the asphalt mixture's resistance to deformation, thereby improving the rutting resistance of the asphalt mixture. Detailed Implementation

[0060] The present invention is further illustrated below by way of examples, but these examples do not limit the invention to the scope of the embodiments described. Experimental methods in the following examples, unless otherwise specified, were performed according to conventional methods and conditions, or as selected in the product instructions. Furthermore, all reagents and raw materials used in this invention are commercially available.

[0061] Example 1

[0062] Mix 3 parts C500 surfactant (alkylamide, Nouryon) and 1 part AEO-9 (Hai'an Petrochemical), 30 parts water, 50 parts butyl acrylate (BA), 28 parts 2-ethylhexyl acrylate (2-EHA), 30 parts styrene (St), 2 parts acrylamide (AM), 0.1 parts acrylic acid (AA), 1.8 parts diacetone acrylamide (DAAM), and 5.5 parts 20% hydrochloric acid thoroughly to form a monomer emulsion with a pH of 1.6.

[0063] Take 0.5 parts of C500, 0.5 parts of 20% hydrochloric acid, and 36 parts of water and add them to the reaction vessel. Turn on the stirring to obtain a base aqueous solution with a pH value of 1.8.

[0064] Heat to 87°C, add 1 part of monomer emulsion to the reaction vessel, add 0.2 parts of sodium persulfate (SPS), and keep warm for 15 min;

[0065] Take 0.5 parts of sodium persulfate (SPS) and 5 parts of water and mix them thoroughly. Add the mixture dropwise to the reaction vessel along with the remaining monomer emulsion. When the dropwise addition has been going on for 2 hours, add 0.2 parts of A151 (vinyltriethoxysilane, Union Carbide, USA) to the monomer emulsion and stir well. The monomer emulsion is to be added dropwise over 6 hours. During the dropwise addition, the temperature in the reaction vessel is controlled at 82±1℃. After the dropwise addition is completed, continue to keep it at this temperature for 1 hour.

[0066] Cool to 50℃, add 20 parts of 135℃ Zhenhai 70# base bitumen, shear at 2800rpm for 1min, cool to room temperature and filter to obtain polymer bitumen emulsion. See Table 1 for specific proportions.

[0067] Table 1

[0068] Application Example 1

[0069] Test Example 1: The ionic charge and solid content of the polymer asphalt emulsion were obtained. Take 100 parts of basalt stone aggregate from Tianchang, Anhui Province, which conforms to MS-III type, add 1 part of "Conch" brand ordinary silicate 42.5# cement, 3 parts of water, and 11 parts of polymer asphalt emulsion. Mix quickly and time the mixture. Test the mixing time, cohesion, wet tire wear and rut depth change rate.

[0070] Example 2

[0071] In Example 1, the surfactants were replaced with L-5 (lignin amine, Shengquan Company) and OP-10 (alkylphenol polyoxyethylene ether, Haian Petrochemical), 20% hydrochloric acid was replaced with 85% formic acid, and acrylic acid monomer was replaced with fumaric acid. The pH of the monomer emulsion was 4.5, and the pH of the base aqueous solution was 2.9. The monomer emulsion dripping time was changed to 4.8 h. During the dripping process, the temperature in the reaction vessel was controlled at 84±1℃, and the asphalt addition temperature was controlled at 145℃. For detailed proportions, please refer to Table 2. Application Example 2 is the same as Application Example 1.

[0072] Table 2

[0073] Example 3

[0074] In Example 1, surfactant 2 was replaced with S-90 (alkyl polyoxyethylene ether, SECCO), 20% hydrochloric acid was replaced with glacial acetic acid, and acrylic monomer was replaced with maleic anhydride. The pH of the monomer emulsion was 5.5, and the pH of the base aqueous solution was 3.3. The monomer emulsion dripping time was changed to 4 hours. During the dripping process, the temperature in the reaction vessel was controlled at 86±1℃, and the asphalt addition temperature was controlled at 150℃. For detailed proportions, please refer to Table 3. Application Example 3 is the same as Application Example 1.

[0075] Table 3

[0076] Example 4

[0077] In Example 1, surfactant 2 was replaced with TO-8 (alkyl polyether, Yangzi-BASF), 20% hydrochloric acid was replaced with 16% nitric acid, acrylic monomer was replaced with itaconic acid, the pH of the monomer emulsion was 2.3, and the pH of the base aqueous solution was 1.8; the monomer emulsion dripping time was changed to 3.5h, the temperature in the reaction vessel was controlled at 88±1℃ during the dripping process, and the asphalt addition temperature was controlled at 158℃. For detailed proportions, please refer to Table 4. Application Example 4 is the same as Application Example 1.

[0078] Table 4

[0079] Example 5

[0080] In Example 1, the surfactants were replaced with Perel 417 (alkyl imidazoline, Injet) and 1309 (alkyl polyether, Corelink), 20% hydrochloric acid was replaced with 15% phosphoric acid, acrylic acid monomer was replaced with methacrylic acid, A151 was replaced with A171, and the initiator SPS was replaced with KPS (potassium persulfate). The pH of the monomer emulsion was 2.8, and the pH of the base aqueous solution was 1.7. The monomer emulsion dropping time was changed to 4.5 h, and the temperature in the reaction vessel was controlled at 86 ± 1 °C during the dropping process. The asphalt addition temperature was controlled at 138 °C. For detailed proportions, please refer to Table 5. Application Example 4 is the same as Application Example 1.

[0081] Table 5

[0082] Example 6

[0083] In Example 1, the surfactants were replaced with MQK-1M (alkylamide, Ingenvit) and LCN070 (alkyl polyether, Clariant), 20% hydrochloric acid was replaced with 15% phosphoric acid, acrylic acid monomer was replaced with methacrylic acid, A151 was replaced with A171, and the initiator SPS was replaced with KPS (potassium persulfate). The pH of the monomer emulsion was 3.6, and the pH of the base aqueous solution was 2.6. The monomer emulsion dropping time was changed to 4.5 h, and the temperature in the reaction vessel was controlled at 86±1℃ during the dropping process. The asphalt addition temperature was controlled at 150℃. For detailed proportions, please refer to Table 6. Application Example 6 is the same as Application Example 1.

[0084] Table 6

[0085] Example 7

[0086] In Example 1, the surfactant was replaced with W-5 (a mixture of lignin amine and alkyl polyoxyethylene ether, Ingenvit Company), 20% hydrochloric acid was replaced with 10% sulfuric acid, and the initiator SPS was replaced with APS (ammonium persulfate). The pH of the monomer emulsion was 1.6, and the pH of the base aqueous solution was 1.4. The monomer emulsion dropping time was changed to 4.5 h. During the dropping process, the temperature in the reaction vessel was controlled at 89±1℃, and the asphalt addition temperature was controlled at 160℃. For detailed proportions, please refer to Table 7. Application Example 7 is the same as Application Example 1.

[0087] Table 7

[0088] Example 8

[0089] In Example 1, surfactant 2 was replaced with 1309 (alkyl polyoxyethylene ether, Xinlian Company), initiator SPS was replaced with APS (ammonium persulfate), the pH of the monomer emulsion was 4.2, and the pH of the base aqueous solution was 1.9; the monomer emulsion dropping time was changed to 3.5h, the temperature in the reaction vessel was controlled at 91±1℃ during the dropping process, and the asphalt addition temperature was controlled at 160℃. For detailed proportions, please refer to Table 8. Application Example 8 is the same as Application Example 1.

[0090] Table 8

[0091] Example 9

[0092] The surfactant in Example 1 was replaced with EM-520S (alkyl polyether amide, Longfu material), the pH value of the monomer emulsion was 5.3, and the pH value of the base aqueous solution was 2.5; the monomer emulsion dripping time was changed to 2.5h, the temperature in the reaction vessel was controlled at 94±1℃ during the dripping process, and the asphalt addition temperature was controlled at 160℃. For detailed proportions, please refer to Table 9. Application Example 9 is the same as Application Example 1.

[0093] Table 9

[0094] Comparative Example 1

[0095] The only difference from Example 1 is that the crosslinking monomer DAAM (diacetone acrylamide) in Example 1 is replaced with deionized water, while the other conditions are the same as in Example 1 and Application Example 1.

[0096] Comparative Example 2

[0097] The polymer asphalt emulsion prepared in Example 1 was replaced with a commercially available anionic nonionic acrylic polymer emulsion and mixed evenly with a commercially available 60% solids content road mixing emulsified asphalt. The application of Comparative Example 2 was the same as that of Application Example 1.

[0098] Comparative Example 3

[0099] The polymer-modified emulsified asphalt prepared in Application Example 1 was replaced with commercially available 60% solids content mixed modified emulsified asphalt, wherein the asphalt was 3.8% SBS modified, and the other conditions were the same as in Application Example 1.

[0100] Comparative Example 4

[0101] The polymer-modified emulsified asphalt prepared in Application Example 1 was replaced with commercially available 60% solids content blended emulsified asphalt (BCR) containing 4.0% SBR latex, with the remaining conditions the same as in Application Example 1.

[0102] Comparative Example 5

[0103] The polymer-modified emulsified asphalt prepared in Example 1 was replaced with commercially available 60% solids content blended emulsified asphalt (BCR) with the addition of 6.0% commercially available SBS latex, and the other conditions were the same as in Application Example 1.

[0104] Comparative Example 6

[0105] The only difference from Example 1 is that the functional monomer A151 in Example 1 is replaced with deionized water, and the other conditions are the same as in Example 1 and Application Example 1.

[0106] Comparative Example 7

[0107] The only difference from Example 1 is that the 20% hydrochloric acid in the base water solution and monomer emulsion in Example 1 is replaced with deionized water, so that the pH value of the base water and monomer emulsion is >7 (alkylamide is alkaline). The other conditions are the same as in Example 1 and Application Example 1.

[0108] Comparative Example 8

[0109] The only difference from Example 1 is that the amount of 20% hydrochloric acid used in Example 1 is increased from 6 parts to 7.5 parts, the pH value of the base aqueous solution and the monomer emulsion are both <1, and the other conditions are the same as in Example 1 and Application Example 1.

[0110] Product performance testing

[0111] The test methods for the above application examples were conducted in accordance with relevant technical specifications or standards such as JTG 5142-2019 "Technical Specification for Maintenance of Highway Asphalt Pavement", JTG F40-2004 "Technical Specification for Construction of Highway Asphalt Pavement", and JTG E20-2019 "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering".

[0112] The mixability time test is used to evaluate the shortest time that cold-mixed and cold-laid asphalt mixtures can be constructed, and it is required to be no less than 120 seconds.

[0113] The cohesion test is used to evaluate the minimum time required for traffic closure and maintenance after the construction of cold-mix asphalt mixture. The cohesion value is required to be ≥2.0 N·m at 60 min. For the same maintenance time, the higher the cohesion value, the shorter the maintenance time required.

[0114] The wet wheel abrasion test is used to evaluate the water damage resistance and compatibility of cold-mix asphalt mixtures. The smaller the abrasion value, the better the water damage resistance and compatibility, and the longer the service life of the cold-mix asphalt mixture.

[0115] The rutting depth ratio test is used to evaluate the rutting resistance of cold-mixed and cold-laid asphalt mixtures. The smaller the rutting depth ratio, the stronger the resistance to rutting deformation.

[0116] Table 10

[0117] As can be seen from Table 10, the polymer asphalt emulsion prepared in the embodiments of the present invention, when applied to cold-mixed and cold-laid asphalt mixtures, has a longer mixing and construction time than the comparative example, and its cohesion after 1 hour of curing is much greater than that of the comparative example. The wet tire abrasion value and rutting depth rate are also significantly better than those of the comparative example, and the various properties are relatively balanced.

[0118] Finally, it should be noted that in this invention, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus.

[0119] Although this disclosure has been described above through specific embodiments, it should be understood that those skilled in the art can devise various modifications, improvements, or equivalents to this disclosure within the spirit and scope of the appended solutions. Such modifications, improvements, or equivalents should also be considered to be included within the scope of protection claimed in this disclosure.

Claims

1. A raw material composition for a polymeric asphalt emulsion, characterized in that, By weight, it comprises: 20-100 parts asphalt, 30-110 parts polymerizable monomers, 0.1-1 parts carboxyl monomers, 0.1-2 parts crosslinking monomers, 0.1-2 parts functional monomers, 0.2-0.7 parts initiator, 1.5-4.5 parts surfactant, 1-6 parts pH adjuster, and 60-80 parts water.

2. The raw material composition of the polymer asphalt emulsion according to claim 1, characterized in that, The asphalt is selected from at least one of petroleum-based asphalt, SBS modified asphalt, SBR modified asphalt, and SIS modified asphalt. And / or, the polymerizable monomer is selected from at least one of styrene, acrylamide, methyl acrylate, ethyl acrylate, butyl acrylate, octyl acrylate, 2-ethylhexyl acrylate, nonyl acrylate, decyl acrylate, lauryl acrylate, hydroxyethyl acrylate, hydroxypropyl acrylate, methyl methacrylate, ethyl methacrylate, butyl methacrylate, isooctyl methacrylate, isodecanyl methacrylate, hydroxyethyl methacrylate, hydroxypropyl methacrylate, cyclohexyl acrylate, and cyclohexyl methacrylate, preferably free of styrene; And / or, the carboxyl monomer is selected from at least one of acrylic acid, methacrylic acid, fumaric acid, maleic anhydride, and itaconic acid, preferably methacrylic acid; And / or, the crosslinking monomer is selected from at least one of diacetone acrylamide, ethyl acetoacetyl methacrylate, and glycidyl methacrylate, preferably glycidyl methacrylate; And / or, the functional monomer is selected from at least one of vinyltriethoxysilane, vinyltrimethoxysilane, and vinyltri(β-methoxyethoxy)silane, preferably vinyltrimethoxysilane; And / or, the initiator is selected from at least one of potassium persulfate, sodium persulfate and ammonium persulfate, preferably potassium persulfate; And / or, the surfactant is selected from at least one of alkylamides, alkyl polyether amides, alkyl imidazolines, lignin ammonium, alkyl polyoxyethylene ethers, and alkylphenol polyoxyethylene ethers, preferably alkylamides and / or alkyl imidazolines; And / or, the pH adjuster is selected from at least one of hydrochloric acid, nitric acid, sulfuric acid, phosphoric acid, formic acid, and acetic acid, preferably phosphoric acid.

3. The raw material composition of the polymer asphalt emulsion according to any one of claims 1 to 2, characterized in that, The asphalt is in the form of 30 to 70 parts by weight; And / or, the polymerizable monomer is 50 to 90 parts by weight; And / or, the carboxyl monomer is present in parts by weight of 0.3 to 0.8 parts; And / or, the crosslinking monomer is present in parts by weight of 0.2 to 1.7 parts; And / or, the functional monomer is present in parts by weight of 0.3 to 1.7 parts; And / or, the initiator is present in a weight fraction of 0.3 to 0.5 parts; And / or, the surfactant is present in 2 to 3 parts by weight; And / or, the pH adjuster is present in 2 to 4 parts by weight; And / or, the water is in the form of 65 to 75 parts by weight.

4. A method for preparing a polymeric asphalt emulsion, characterized in that, The raw materials for the polymer asphalt emulsion include the raw material composition of the polymer asphalt emulsion as described in any one of claims 1 to 3, specifically including the following steps: (1) Mix a portion of surfactant, water, polymerizable monomer, carboxyl monomer, crosslinking monomer and pH adjuster evenly to prepare monomer emulsion; (2) Add the remaining surfactant, water and pH adjuster to the reaction vessel, mix well, and prepare a base aqueous solution; (3) Take a portion of the monomer emulsion and add it to the base aqueous solution, then add a portion of the initiator, stir, and heat to 80-95°C for heat preservation treatment; (4) Take the remaining initiator and water, mix them evenly, and add them dropwise to the reaction vessel along with the remaining monomer emulsion. Stir and add for a period of time. Then add the functional monomer to the monomer emulsion and continue to add. The total addition time is 2.5 to 6 hours. After the addition is completed, keep the mixture warm while stirring to obtain the polymer emulsion. (5) Cool down to 45-70°C, add asphalt to the polymer emulsion under shearing or grinding conditions, continue shearing or grinding, cool and filter to obtain polymer asphalt emulsion.

5. The method for preparing the polymer asphalt emulsion according to claim 4, characterized in that, The preparation method satisfies at least one of the following conditions: In step (1), the amount of surfactant is 1.4 to 4.0 parts by weight; In step (1), the weight of water is 29 to 35 parts; In step (1), the pH adjuster is 0.1 to 0.5 parts by weight; In step (2), the pH adjuster is present in a weight ratio of 0.9 to 5.5 parts; In steps (1) and (2), the pH adjuster adjusts the pH value in the range of 1 to 7, preferably 2 to 5; In step (2), the remaining surfactant is 0.1 to 0.5 parts by weight; In step (2), the weight of water is 30 to 40 parts.

6. The method for preparing the polymer asphalt emulsion according to claim 4, characterized in that, The preparation method satisfies at least one of the following conditions: In step (3), the monomer emulsion has a weight ratio of 0 to 5 parts; In step (3), the weight fraction of the initiator is 0.1 to 0.2 parts; In step (3), the heat preservation treatment time is 5 to 20 minutes.

7. The method for preparing the polymer asphalt emulsion according to claim 4, characterized in that, The preparation method satisfies at least one of the following conditions: In step (4), the remaining initiator is 0.1 to 0.5 parts by weight; In step (4), the water is 1 to 5 parts by weight; In step (4), the functional monomer is added 0 to 5 hours after the start of the dripping, preferably 2 to 3 hours after the start of the dripping; In step (4), the dropping temperature is 80–95°C; In step (4), the heat preservation treatment time is 0.5 to 2 hours; In step (4), the temperature of the heat preservation treatment is 80-95℃.

8. The method for preparing the polymer asphalt emulsion according to claim 4, characterized in that, The preparation method satisfies at least one of the following conditions: In step (5), the temperature at which the asphalt is added is 110–180°C, preferably 130–160°C; In step (5), the time for continued shearing or grinding is 30s to 30min.

9. A polymeric asphalt emulsion, characterized in that, It is prepared by the method for preparing polymer asphalt emulsion according to any one of claims 4 to 8.

10. The application of the polymer asphalt emulsion as described in claim 9 in the cold-mix and cold-lay process of asphalt pavement.

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