High-performance micro-rut asphalt modifier, preparation method and application thereof

Abstract

The present application relates to the field of road engineering, in particular to a high-performance micro rut asphalt modifier and its preparation method and application. The high-performance micro rut asphalt modifier contains 50-70 parts of waste lithium battery recycling diaphragm, 10-20 parts of bisphenol A type epoxy resin, 5-10 parts of high-temperature long-chain flexible epoxy resin curing agent, 5-10 parts of desulfurized rubber powder, 1-3 parts of curing accelerator and 1-5 parts of silane coupling agent, wherein the pore size of the diaphragm is preferably 50-100 microns; during preparation, the epoxy resin is first diluted with ethanol, mixed with the diaphragm powder and the ethanol is recovered, and then the other components are added and stirred; after the modifier is directly put into the asphalt mixing cylinder, not only the epoxy resin is released at high temperature, but also the polyolefin modified asphalt is released by the diaphragm, so that the asphalt has high-temperature anti-rutting and low-temperature anti-cracking properties, and the lithium battery diaphragm recycling is realized. The present application conforms to the environmental protection concept and is suitable for rapid traffic maintenance engineering.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of road engineering, in particular to a high-performance micro rut asphalt modifier and its preparation method and application. BACKGROUND

[0002] Traditional anti-rutting agents mostly use recycled plastics as the main raw material, which has poor quality stability, and the anti-rutting effect on severe rutting sections under the long-term action of extra-heavy traffic and creep load is limited. Increasing the dosage of anti-rutting agent will reduce the low-temperature crack resistance of asphalt mixture.

[0003] In recent years, adding thermosetting epoxy resin materials to asphalt mixture to improve the anti-rutting performance of asphalt mixture can solve the problem of severe rutting on the above-mentioned special sections. For example, CN110713695A (a super-high-tough epoxy resin material for hot-mixing epoxy asphalt and its preparation method) and CN111875930A (a hot-mixing epoxy resin, a preparation method and use) use modified epoxy resin to prepare epoxy asphalt mixture with excellent anti-rutting performance. However, the epoxy asphalt material has high technical requirements, the epoxy resin is a liquid, and it needs to be stored separately. When used, it is first pre-mixed and then put into the asphalt mixing drum for use, and a set of epoxy resin pre-mixing and gluing equipment is required for production.

[0004] The existing hot-mixing asphalt dry direct-feeding type epoxy resin modifier (CN109722044A) is a direct-feeding type epoxy modifier for hot-mixing asphalt, a preparation method and a use method thereof. A porous inorganic powder is used as a carrier to adsorb epoxy resin to form an adsorbed modifier powder, and there is no need for pre-mixing and gluing equipment. However, the material used in this invention has limited asphalt modification ability, and the strength is mainly formed by the reaction and curing of epoxy resin. Like traditional two-component liquid epoxy asphalt mixture, it has low early strength, long curing time (about 7-15 days), and is not suitable for rutting treatment and maintenance engineering of intersections, public platforms and other places that require rapid development of traffic. In addition, the invention uses a large amount of inorganic filler carrier, which affects the low-temperature crack resistance of epoxy asphalt mixture.

[0005] Therefore, it is urgent to develop a kind of asphalt mixture modifier which can be used without complex pre-mixing equipment, can be used directly by dry method, and can balance early high strength, short curing time and good low-temperature crack resistance, and can meet the rapid maintenance needs of heavy traffic sections. SUMMARY

[0006] To achieve one of the above purposes, the application provides a high-performance micro-rut asphalt modifier and its preparation method and application. The lithium battery separator recovery film is used to solve the problems of traditional epoxy asphalt, such as inconvenient feeding, long curing time, low early strength, and the like. The traditional feeding cannot be used in rut treatment and maintenance engineering of intersections, bus stations and other road sections requiring rapid development of traffic. The application provides a high-performance micro-rut asphalt modifier without curing and convenient to use, thereby being more practical and having the value of industrialization. The technical scheme of the application is as follows:

[0007] In the first aspect, the application provides a high-performance micro-rut asphalt modifier, which comprises the following components: waste lithium battery recovery separator, bisphenol A epoxy resin, high-temperature long-chain flexible epoxy resin curing agent, devulcanized rubber powder, curing accelerator and silane coupling agent.

[0008] Preferably, the high-performance micro-rut asphalt modifier comprises the following components by weight: 50-70 parts of waste lithium battery recovery separator, 10-20 parts of bisphenol A epoxy resin, 5-10 parts of high-temperature long-chain flexible epoxy resin curing agent, 5-10 parts of devulcanized rubber powder, 1-3 parts of curing accelerator and 1-5 parts of silane coupling agent.

[0009] Specifically, too much waste lithium battery recovery separator will result in low epoxy resin content, and the thermoplastic asphalt cannot be changed into thermosetting asphalt material through epoxy resin curing, the prepared modifier has limited rut resistance, and the micro-rut effect cannot be achieved. Too little waste lithium battery recovery separator will result in low adsorption amount of epoxy resin, and the contact between the epoxy resin and the curing agent cannot be blocked, the stability of the modifier is poor, and the modifier cannot be stored and used.

[0010] Preferably, the pore size of the waste lithium battery recovery separator is 50-100 microns.

[0011] Specifically, the waste lithium battery recovery separator is a waste lithium battery recovery separator with a pore size of 50-100 microns. If the pore size is greater than 100 microns, the blocking effect on the epoxy resin main agent and the curing agent is poor, the contact reaction is easy, and the storage stability and product shelf life are affected. If the pore size is less than 50 microns, the adsorption capacity of the epoxy resin main agent is poor, the adsorption amount is insufficient, and the modification effect is poor.

[0012] Preferably, the bisphenol A epoxy resin comprises at least one of E51 and E44.

[0013] Specifically, the E51 and E44 are commonly used bisphenol A epoxy resins, which are liquid at room temperature and have low cost.

[0014] Preferably, the raw materials of the high-temperature long-chain flexible epoxy resin curing agent include octadecylamine and polysaccharide anhydride, wherein the weight ratio of octadecylamine to polysaccharide anhydride is (3-5):1.

[0015] Specifically, polysaccharide anhydride curing agent effectively improves the low-temperature flexibility of cured epoxy resin. However, polysaccharide anhydride reacts slowly with epoxy resin, resulting in slow strength formation and requiring long curing time. Octadecylamine has higher reactivity with epoxy resin than polysaccharide anhydride, thus improving the strength of cured epoxy resin. Taking into account both the mechanical strength and low-temperature toughness of cured epoxy resin, the curing agent with the final compound ratio was determined.

[0016] Preferably, the desulfurized rubber powder is taken from waste tires, and the mesh size of the desulfurized rubber powder is 40-60 mesh.

[0017] Specifically, in the use of dry modifiers, 40-60 mesh particles can be more effectively melted and dispersed in asphalt. If the mesh number is too small, the corresponding particle size is large, making it difficult to disperse evenly in the asphalt during the mixing process. If the mesh number is too large, the particle specific surface area is large, which has a significant impact on the viscosity of the asphalt, increasing the viscosity of the asphalt and making it difficult to work and use. A large mesh number will also lead to high production costs and low production efficiency, making it impossible to promote and apply on a large scale.

[0018] Preferably, the curing accelerator includes any one of 2,4,6-tris(dimethylaminomethyl)phenol, N-p-chlorophenyl-N,N'-dimethylurea, and 2-ethyl-4-methylimidazole.

[0019] Preferably, the silane coupling agent includes any one of γ-aminopropyltriethoxysilane, γ-glycidoxypropyltrimethoxysilane, and γ-methacryloyloxypropyltrimethoxysilane.

[0020] In a second aspect, the present invention provides a method for preparing the high-performance micro-rutting asphalt modifier described in the first aspect, comprising the following steps:

[0021] S1. Mix bisphenol A epoxy resin with ethanol and stir to obtain diluted bisphenol A epoxy resin;

[0022] S2. The waste lithium battery separator is crushed to 40-60 mesh, and then mixed with the diluted bisphenol A epoxy resin at room temperature. Then the temperature is raised and the pressure is reduced and the ethanol is distilled and recovered. After the ethanol is recovered, it is cooled to room temperature, and then silane coupling agent and curing accelerator are added and mixed to obtain a mixture.

[0023] S3. Add desulfurized rubber powder and high-temperature long-chain flexible epoxy resin curing agent to the above mixture, and stir to obtain the high-performance micro-rutting asphalt modifier.

[0024] Thirdly, the present invention provides the application of the high-performance micro-rutting asphalt modifier described in the first aspect in the treatment and maintenance of rutting on asphalt pavements.

[0025] Compared with the prior art, the advantages of the present invention are as follows:

[0026] (1) This invention solves the problem of direct mixing and long-term storage of epoxy resin and curing agent, which is convenient to store and use. It can be directly added to the asphalt mixture mixing tank. It also solves the problems of two-component storage of epoxy resin and the complex process of premixing and then gluing before use.

[0027] (2) The polyolefin in the waste recycled lithium battery separator material of the present invention melts during high-temperature production and disperses in the asphalt during the mixing process, thereby modifying the asphalt, increasing the viscosity and hardness of the asphalt, increasing the early strength and high-temperature rutting resistance of the micro-rutting asphalt mixture, solving the problems of low early strength, long curing time and inability to be used in traffic maintenance projects that require rapid development of traditional epoxy asphalt mixtures. The epoxy resin and curing agent slowly react and cure during use, which also improves the high-temperature rutting resistance and low-temperature crack resistance of the asphalt mixture.

[0028] (3) Recycling and reusing lithium battery separators can effectively reduce the harm of waste lithium batteries to the environment, which is in line with environmental protection requirements and the trend of sustainable development. Detailed Implementation

[0029] The embodiments of the present invention are described in detail below. The embodiments described below are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0030] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. Furthermore, in the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0031] In this document, the terms “containing,” “comprising,” or “including” are open-ended expressions, meaning they include the contents specified in this invention but do not exclude other aspects.

[0032] In this document, the terms “optional,” “optionally,” or “optional” generally refer to an event or condition that may, but may not, occur, and the description includes both cases in which the event or condition occurs and cases in which the event or condition does not occur.

[0033] It should be noted that this invention utilizes the porous structure of recycled lithium battery separators with pores of 50-100 micrometers. Room-temperature liquid bisphenol A epoxy resin is diluted with ethanol solvent and introduced into the micropores of the lithium battery separator. After the ethanol is recovered by vacuum distillation, the epoxy groups in the epoxy resin molecules remaining in the micropores form hydrogen bonds with the hydrogen in the lithium battery separator, adsorbing the epoxy resin molecules into the pores of the recycled lithium battery separator. This isolates the epoxy resin from direct contact with the curing agent, solving the problem of long-term storage of directly mixed epoxy resin and curing agent. It is convenient to store and use, and can be directly added to the asphalt mixing tank. It also solves the complex process of storing two components of epoxy resin and the need for pre-mixing before application and feeding.

[0034] Simultaneously, during the asphalt mixture production and mixing process, high temperatures disrupt the molecular structure between epoxy molecules and the lithium battery separator, releasing epoxy resin. Furthermore, the polyolefins (polyethylene PE, polypropylene PP, POE, etc.) in the recycled lithium battery separator material melt during high-temperature production and disperse into the asphalt during mixing, thus modifying the asphalt. The three-dimensional network structure formed by the polyolefin modifier dissolving or swelling and dispersing in the asphalt at high temperatures effectively inhibits the flow deformation of asphalt at high temperatures, increasing its viscosity and hardness. This enhances the early strength and high-temperature rutting resistance of micro-rutting asphalt mixtures, solving the problem of low early strength and long curing time in traditional epoxy asphalt mixtures, which prevents their application in traffic maintenance projects requiring rapid development. The slow reaction and curing of epoxy resin and curing agent during use also improves the high-temperature rutting resistance and low-temperature crack resistance of the asphalt mixture. Secondly, the recycling and reuse of lithium battery separators can effectively reduce the environmental harm caused by waste lithium batteries, aligning with environmental protection requirements and the trend of sustainable development. This invention not only solves the problem of recycling and reusing lithium battery separators, but also utilizes their porous structure and properties to use them as a carrier for bisphenol A epoxy resin, simultaneously enabling the dry application of epoxy modifiers, and improving the high-temperature rutting resistance and low-temperature crack resistance of asphalt mixtures.

[0035] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present invention.

[0036] All materials used in this invention were purchased from the market. Specifically, the bisphenol A epoxy resin was purchased from Bahrain Petrochemical Co., Ltd.; the ethanol was purchased from Shandong Luying Chemical Co., Ltd.; the waste lithium battery recycling separator was purchased from Suzhou Hongyuanjia Renewable Resources Utilization Co., Ltd.; the waste tires were purchased from Hubei Hairui Environmental Protection New Material Technology Co., Ltd.; and the diatomite was purchased from Shijiazhuang Hualang Mineral Products Trading Co., Ltd.

[0037] This invention provides a method for preparing a high-performance micro-rutting asphalt modifier, comprising the following steps:

[0038] S1. Dilute 10-20 parts of bisphenol A epoxy resin with 20-40 parts of ethanol (75% volume concentration) and stir to obtain diluted bisphenol A epoxy resin.

[0039] S2. The waste lithium battery separator is pulverized to 40-60 mesh using a low-temperature grinding mill. Then, the bisphenol A epoxy resin diluted with ethanol obtained in step S1 and 50-70 parts of the waste lithium battery separator powder are added to a mixer and stirred at room temperature for 0.5-1 hour. Then, the temperature is raised to 40-50℃ and the ethanol is recovered by vacuum distillation. After all the ethanol has been recovered, the mixture is cooled to room temperature. Then, 1-5 parts of silane coupling agent and 1-3 parts of curing accelerator are added and stirred for 10-15 minutes to obtain mixture A.

[0040] S3. Crush waste tires to 40-60 mesh using a low-temperature grinding mill. Add 5-10 parts of desulfurized tire rubber powder and 5-10 parts of high-temperature long-chain flexible epoxy resin curing agent to mixture A obtained in S2. Then stir for 0.5-1 hour to obtain a high-performance micro-rutting asphalt modifier.

[0041] Example 1

[0042] This embodiment provides a method for preparing a high-performance micro-rutting asphalt modifier, including the following steps:

[0043] S1. Dilute 100g of bisphenol A E51 epoxy resin with 200g of ethanol and stir to obtain diluted bisphenol A epoxy resin E51.

[0044] S2. The waste lithium battery separator with a pore size of 50 micrometers is pulverized to 40 mesh using a low-temperature grinding mill. Then, the bisphenol A epoxy resin diluted with ethanol obtained in step S1 and 500g of waste lithium battery separator powder are added to a mixer and stirred at room temperature for 0.5h. Then, the temperature is raised to 40℃ and the ethanol is recovered by vacuum distillation. After all the ethanol is recovered, the mixture is cooled to room temperature. Then, 10g of γ-aminopropyltriethoxysilane coupling agent and 10g of 2,4,6-tris(dimethylaminomethyl)phenol curing accelerator are added and stirred for 10min to obtain mixture A1.

[0045] S3. The waste tires are crushed to 40 mesh using a low-temperature grinding mill. 50g of 40-mesh desulfurized tire rubber powder and 50g of high-temperature long-chain flexible epoxy resin curing agent (octadecylamine: polydecanoic anhydride weight ratio of 3:1) are added to the mixture A1 obtained in S2. The mixture is then stirred for 0.5h to obtain a high-performance micro-rutting asphalt modifier.

[0046] Example 2

[0047] This embodiment provides a method for preparing a high-performance micro-rutting asphalt modifier, including the following steps:

[0048] S1. Dilute 150g of bisphenol A E51 epoxy resin with 300g of ethanol and stir to obtain diluted bisphenol A epoxy resin E51.

[0049] S2. The waste lithium battery separator with a pore size of 80 micrometers is pulverized to 50 mesh using a low-temperature grinding mill. Then, the bisphenol A epoxy resin diluted with ethanol obtained in step S1 and 600g of waste lithium battery separator powder are added to a mixer and stirred at room temperature for 1 hour. Then, the temperature is raised to 50°C and the ethanol is recovered by vacuum distillation. After all the ethanol has been recovered, the mixture is cooled to room temperature. Then, 30g of γ-glycidyl etheroxypropyltrimethoxysilane coupling agent and 30g of 2,4,6-tris(dimethylaminomethyl)phenol curing accelerator are added and stirred for 10 minutes to obtain mixture A2.

[0050] S3. Add 100g of 40-mesh desulfurized tire rubber powder and 70g of high-temperature long-chain flexible epoxy resin curing agent (octadecylamine: polydecanoic anhydride weight ratio of 4:1) to mixture A2 obtained in S2, and then stir for 0.8h to obtain a high-performance micro-rutting asphalt modifier.

[0051] Example 3

[0052] This embodiment provides a method for preparing a high-performance micro-rutting asphalt modifier, including the following steps:

[0053] S1. Dilute 200g of bisphenol A E44 epoxy resin with 400g of ethanol and stir to obtain diluted bisphenol A epoxy resin E44.

[0054] S2. The waste lithium battery separator with a pore size of 100 micrometers is pulverized to 60 mesh using a low-temperature grinding mill. Then, the bisphenol A epoxy resin diluted with ethanol obtained in step S1 and 700g of waste lithium battery separator powder are added to a mixer and stirred at room temperature for 1 hour. Then, the temperature is raised to 45°C and the ethanol is recovered by vacuum distillation. After all the ethanol has been recovered, the mixture is cooled to room temperature. Then, 50g of γ-methacryloyloxypropyltrimethoxysilane coupling agent and 30g of 2-ethyl-4-methylimidazolium curing accelerator are added and stirred for 15 minutes to obtain mixture A3.

[0055] S3. Add 70g of 60-mesh desulfurized tire rubber powder and 100g of high-temperature long-chain flexible epoxy resin curing agent (octadecylamine: polydecanoic anhydride weight ratio of 5:1) to mixture A3 obtained in S2, and then stir for 1 hour to obtain a high-performance micro-rutting asphalt modifier.

[0056] Comparative Example 1

[0057] This comparative example provides a method for preparing a comparative modifier, wherein the pore size of the waste lithium battery recycling separator is 150 micrometers, including the following steps:

[0058] S1. Dilute 200g of bisphenol A E51 epoxy resin with 400g of ethanol and stir to obtain diluted bisphenol A epoxy resin E51.

[0059] S2. The waste lithium battery separator with a pore size of 150 micrometers is pulverized to 60 mesh using a low-temperature grinding mill. Then, the bisphenol A epoxy resin diluted with ethanol obtained in step S1 and 700g of waste lithium battery separator powder are added to a mixer and stirred at room temperature for 1 hour. Then, the temperature is raised to 45°C and the ethanol is recovered by vacuum distillation. After all the ethanol has been recovered, the mixture is cooled to room temperature. Then, 50g of γ-methacryloyloxypropyltrimethoxysilane coupling agent and 30g of 2-ethyl-4-methylimidazolium curing accelerator are added and stirred for 15 minutes to obtain mixture A4.

[0060] S3. Add 70g of 40-mesh desulfurized tire rubber powder and 100g of high-temperature long-chain flexible epoxy resin curing agent (octadecylamine: polydecanoic anhydride weight ratio of 5:1) to mixture A3 obtained in S2, and then stir for 1 hour to obtain a comparative modifier.

[0061] The modifier obtained in Comparative Example 1 had obvious liquid epoxy resin. This may be because the membrane powder with excessively large pore size had a poor barrier effect on the epoxy resin main agent and curing agent, and it clumped after one week, making it unusable. Therefore, no performance comparison test was conducted later.

[0062] Comparative Example 2

[0063] This comparative example provides a method for preparing a comparative modifier, wherein the separator from a recycled waste lithium battery is replaced with diatomaceous earth powder, including the following steps:

[0064] S1, dilute 200g of bisphenol A E51 epoxy resin with 400g of ethanol and stir to obtain diluted bisphenol A epoxy resin E51.

[0065] S2, inorganic porous diatomaceous earth powder and ethanol-diluted bisphenol A epoxy resin E51 are added to a mixer and stirred at room temperature for 1 hour. Then, the mixture is heated to 45°C and the ethanol is recovered by vacuum distillation. After all the ethanol has been recovered, the mixture is cooled to room temperature. Then, 50g of γ-methacryloyloxypropyltrimethoxysilane coupling agent and 30g of 2-ethyl-4-methylimidazolium curing accelerator are added and stirred for 15 minutes to obtain mixture A5.

[0066] S3, in the mixture A3 obtained in S2, 70g of 40-mesh desulfurized tire rubber powder and 100g of high-temperature long-chain flexible epoxy resin curing agent (octadecylamine: polydecanoic anhydride = 5: 1) are added and then stirred for 1 hour to obtain a comparative modifier.

[0067] Comparative Example 3

[0068] This comparative example provides a method for preparing a comparative modifier, wherein the bisphenol A epoxy resin is replaced with (E20), including the following steps:

[0069] S1. Dilute 200g of bisphenol A (E20) epoxy resin with 400g of ethanol and stir to obtain diluted bisphenol A epoxy resin (E20);

[0070] S2. The waste lithium battery separator with a pore size of 150 micrometers is pulverized to 60 mesh using a low-temperature grinding mill. Then, the bisphenol A epoxy resin diluted with ethanol obtained in step S1 and 700g of waste lithium battery separator powder are added to a mixer and stirred at room temperature for 1 hour. Then, the temperature is raised to 45℃ and the ethanol is recovered by vacuum distillation. After all the ethanol has been recovered, the mixture is cooled to room temperature. Then, 50g of γ-methacryloyloxypropyltrimethoxysilane coupling agent and 30g of 2-ethyl-4-methylimidazolium curing accelerator are added and stirred for 15 minutes to obtain mixture A6.

[0071] S3. Add 70g of 40-mesh desulfurized tire rubber powder and 100g of high-temperature long-chain flexible epoxy resin curing agent (octadecylamine: polydecanoic anhydride weight ratio of 5:1) to mixture A6 obtained in S2, and then stir for 1 hour to obtain a comparative modifier.

[0072] Comparative Example 4

[0073] This comparative example provides a method for preparing a comparative modifier, wherein the number of parts of the waste lithium battery recycled separator is 40 parts, and the rest is the same as in Example 1.

[0074] The surface of the modifier prepared in Comparative Example 4 was wet, with a large amount of epoxy resin not being adsorbed and some liquid epoxy resin dripping down, making it unusable as a modifier. Therefore, no further tests were conducted.

[0075] Comparative Example 5

[0076] This comparative example provides a method for preparing a comparative modifier, wherein the number of parts of the waste lithium battery recycled separator is 80 parts, and the rest is the same as in Example 1.

[0077] The modifiers prepared in Examples 1-3 and Comparative Examples 2-5 were added to asphalt mixtures to prepare asphalt mixtures. The steps were as follows: Using AC-13 gradation, the base asphalt was heated to 150℃ and the aggregate to 210℃. The mixing pot was first heated to 185℃, then the heated aggregate and modifier were added and dry-mixed for 10 seconds to ensure the modifier completely melted and coated the aggregate surface. The modifier addition amount was 1% of the aggregate. Then, heated asphalt and mineral powder were added to the mixing pot, with the asphalt amount added at an asphalt-aggregate ratio of 4.8%. Wet mixing and molding were performed for 45 seconds, and the modified asphalt mixture was then discharged. The prepared modified asphalt mixture was kept in an oven for 2 hours before molding relevant mixture specimens, controlling the molding temperature at 175℃. The mixture performance was tested according to the requirements of the Highway Engineering Asphalt and Asphalt Mixture Test Procedure (JTG E20-2011), and the test results are shown in Table 1.

[0078] Table 1. Properties of asphalt mixtures prepared by the modifiers in Examples 1-3 and the comparative examples.

[0079] Test group number Example 1 Example 2 Example 3 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Technical requirements Void ratio (%) 4.1 4.1 4.1 4.0 4.0 / 4.1 3.0~6.0 1d Marshall stability (kN) 14.2 16.7 16.8 9.5 12.4 / 14.6 ≥12 5d Marshall stability (kN) 26.8 28.5 32.9 22.4 14.5 / 18.2 ≥20 Residual stability S0 (%) 89.5 88.4 94.3 92.0 89.2 / 87.2 ≥85 Freeze-thaw splitting ratio TSR (%) 84.7 82.3 88.5 86.2 82.1 / 82.6 ≥80 1d 70°C dynamic stability (times / mm) 6200 5325 5895 826 3265 / 5826 ≥3000 5d 70°C dynamic stability (times / mm) 26162 24865 28628 26856 4586 / 12852 ≥20000 -10°C low-temperature beam failure strain (με) 2987 2789 2685 1870 2148 / 2746 ≥2500

[0080] The 1-day Marshall strength and dynamic stability test results were obtained after the specimen was molded and placed at room temperature for 1 day. The 5-day Marshall strength and dynamic stability test results were obtained after the specimen was molded and kept in a 60°C oven for 4 days, and then placed at room temperature for 1 day.

[0081] Table 1 shows that the asphalt mixtures prepared with the micro-rutting modifiers in Examples 1-3 exhibit significantly higher 1-day Marshall strength and 1-day dynamic stability at 70°C than Comparative Example 1. This indicates that using a lithium battery membrane as an adsorbent carrier can improve the early strength of the asphalt mixture. The 5-day Marshall strength is greater than 20 kN and the 70°C dynamic stability is greater than 20,000 cycles / mm, demonstrating a substantial increase in strength with the curing of the epoxy resin and exhibiting excellent resistance to rutting. As can be seen from the bending failure strain of the beam at -10℃ in Table 1, the bending failure strain of the modifier in Comparative Example 2, which uses inorganic porous diatomaceous earth as the adsorption carrier, is significantly reduced at low temperature, and its low-temperature crack resistance does not meet the technical specifications. This indicates that the inorganic porous carrier material reduces the low-temperature crack resistance of the asphalt mixture. Comparative Example 3, which uses E20 bisphenol A epoxy resin, prepared a modified asphalt mixture with a 5-day dynamic stability of only 4586 cycles / mm at 70℃, and a beam failure strain of 2148 με at -10℃. Both its high-temperature rutting resistance and low-temperature crack resistance fail to meet the requirements. This is because E20 bisphenol A epoxy resin has a large molecular weight, low activity, and is a solid at room temperature, making it unable to fully react and form strength after the asphalt mixture is laid. In Comparative Example 4, after reducing the amount of lithium battery separator, the prepared modifier showed obvious liquid epoxy resin flow on its surface, indicating poor adsorption of epoxy resin. Therefore, it could not be used as a modifier and no performance test was conducted. In Comparative Example 5, after increasing the amount of lithium battery separator, the prepared asphalt mixture showed a 5-day dynamic stability of only 4586 cycles / mm at 70℃, and its low-temperature crack resistance was only 2148 με. The dynamic stability at 70℃ is only 12,852 cycles / mm, which cannot meet the requirement of greater than 20,000 cycles / mm. This indicates that its high-temperature rutting resistance performance cannot meet the requirements and cannot achieve the application effect of micro-rutting.

[0082] The embodiments described above are some, but not all, of the embodiments of the present invention. The detailed description of the embodiments of the present invention is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

Claims

1. A high performance micro rut asphalt modifier characterized by, By weight parts, including the following components: waste lithium battery recycling membrane 50~70 parts, bisphenol A epoxy resin 10~20 parts, high temperature long chain flexible epoxy resin curing agent 5~10 parts, devulcanized rubber powder 5~10 parts, curing accelerator 1~3 parts, silane coupling agent 1~5 parts; The pore size of the waste lithium battery recycling membrane is 50~100 microns; The bisphenol A epoxy resin includes at least one of E51 and E44; The raw material of the high-temperature long-chain flexible epoxy resin curing agent includes octadecylamine and polysebacic anhydride, and the weight ratio of octadecylamine to polysebacic anhydride is (3-5):1; The devulcanized rubber powder is taken from waste tires, and the mesh number of the devulcanized rubber powder is 40~60 mesh.

2. The high performance micro rut asphalt modifier of claim 1, wherein, The curing accelerator includes any one of 2,4,6-tris(dimethylaminomethyl)phenol, N-p-chlorophenyl-N,N'-dimethylurea, and 2-ethyl-4-methylimidazole.

3. The high performance micro rut asphalt modifier of claim 1, wherein, The silane coupling agent includes any one of γ-aminopropyltriethoxysilane, γ-glycidyl ether propyltrimethoxysilane, and γ-methacryloyloxypropyltrimethoxysilane.

4. A process for the preparation of a high performance micro rut asphalt modifier as claimed in any one of claims 1 to 3, characterised in that, Including the following steps: S1, mix bisphenol A epoxy resin with ethanol and stir to obtain diluted bisphenol A epoxy resin; S2, crush the waste lithium battery recycling membrane to 40~60 mesh, then mix with the above diluted bisphenol A epoxy resin at room temperature, then heat and reduce pressure and distill the recovered ethanol, cool to room temperature after the ethanol is recovered, then add silane coupling agent and curing accelerator and stir to obtain a mixture; S3, add devulcanized rubber powder and high-temperature long-chain flexible epoxy resin curing agent to the above mixture and stir to obtain the high-performance micro-rut asphalt modifier.

5. The use of the high-performance micro-rut asphalt modifier according to any one of claims 1~3 in rut treatment and maintenance engineering of asphalt pavement.