Modified asphalt coating as well as preparation method and application thereof

Abstract

The invention relates to the technical field of high polymer materials, in particular to a modified asphalt coating as well as a preparation method and application thereof. The modified asphalt coating is prepared from, by weight, 40-60 parts of modified asphalt, 10-25 parts of waste rubber powder and 0.5-1 part of a rubber regeneration activating agent, the rubber regeneration activating agent is bis (2-nitrophenyl) disulfide, and the modified asphalt is nanoscale graphene or carbon nano tube modified asphalt. According to the invention, the waste rubber powder is regenerated by the specific rubber regeneration activator, and the component quality control is cooperated, so that the regeneration effect of the waste rubber powder is remarkably improved, and the mechanical properties and weather resistance of the modified asphalt coating applied to coiled material preparation are further effectively improved.

Description

Technical Field

[0001] This invention relates to the field of polymer materials technology, and in particular to a modified asphalt coating, its preparation method, and its application. Background Technology

[0002] Currently, the production of traditional waterproof membranes mainly relies on virgin rubber, petroleum-based asphalt, and fossil-based additives, with the following technical solutions: 1. Waterproof membranes with virgin rubber as the base material: These are prepared by blending natural or synthetic rubber with asphalt and adding petroleum-based plasticizers and stabilizers. This type of membrane has stable performance, but it consumes a large amount of virgin rubber resources, resulting in high costs. Furthermore, it lacks a waste rubber utilization stage, leading to a low waste rubber utilization rate (typically <15%), which does not meet the requirements of a circular economy. 2. Reclaimed rubber-based waterproof membranes: These are prepared by physically crushing waste rubber and adding it directly to the asphalt system, or by using traditional regeneration activators (such as thiophenol compounds) for desulfurization treatment. While current waste rubber recycled waterproof membrane technology partially utilizes waste rubber, it suffers from the following problems: (1) Traditional recycling activators (such as p-tert-butylcatechol) are highly toxic, and the recycling process releases harmful substances, which can easily lead to environmental risks; (2) The vulcanization network of recycled rubber is not completely destroyed, resulting in a significant decrease in the tensile strength, low-temperature flexibility, and weather resistance of the membrane. Specifically, the mechanical properties of recycled rubber are severely degraded (low-temperature flexibility is reduced by more than 40% compared to virgin rubber), and the heat resistance (<90℃), low-temperature flexibility (>-20℃ cracking) and weather resistance of the membrane are insufficient, making it difficult to meet the needs of high-end waterproof projects; (3) The formulation relies on harmful plasticizers such as waste engine oil, which does not meet the standards for green building materials; (4) The desulfurization and bond breaking process is irreversible, resulting in excessively low cohesion of the membrane compound. Therefore, how to achieve deep recycling of waste rubber and provide a waterproof membrane with good mechanical properties, weather resistance, and environmental friendliness has become a technical problem that urgently needs to be solved in this field.

[0003] The prior art CN107189756A discloses a modified bitumen waterproof membrane comprising a base layer B, an upper surface layer A bonded to the base layer B, and a lower surface layer C bonded to the base layer B. The upper surface layer A and the base layer B, as well as the base layer B and the lower surface layer C, are all bonded together using elastomeric modified bitumen. The base layer B is made of glass fiber film, the upper surface layer A is made of polyethylene film, high-temperature resistant polyester film, or fine sand, and the lower surface layer C is made of polyethylene film. The elastomeric modified bitumen is prepared according to the following steps: carbon nanotubes are hydroxylated and then acidified to obtain a second material; MAH-g-SBS is mixed with the second material and ultrasonically dispersed, then aged to obtain carbon nanotube modified SBS; the bitumen is heated, and carbon nanotube modified SBS, nano zinc oxide, and other materials are added sequentially, with continued heating to obtain a mixture; the mixture is oxidized and polished, and then talc powder is added to obtain the elastomeric modified bitumen. The existing technology discloses modified bitumen mainly by adding carbon nanotubes to modify SBS in bitumen to change the interfacial energy of carbon nanotubes in MAH-g-SBS, reducing system agglomeration, thereby improving the toughness, heat resistance, and wear resistance of modified bitumen waterproof membranes. However, no recycled rubber is added to the modified bitumen, so it cannot address the application problem of recycled rubber in modified bitumen waterproof membranes, nor can it effectively improve the relevant mechanical properties and weather resistance of recycled rubber modified bitumen waterproof membranes. Summary of the Invention

[0004] This invention addresses the shortcomings of existing modified bitumen waterproof membranes, such as incomplete destruction of the regenerated vulcanization network in the intermediate layer (modified bitumen layer), poor compatibility with bitumen, and consequently, decreased overall performance of the modified bitumen waterproof membrane. It provides a modified bitumen coating that achieves deep regeneration of the regenerated rubber through a specific rubber regeneration and activation system, improving compatibility with the bitumen system and effectively enhancing the mechanical and weather resistance properties of the applied modified bitumen waterproof membrane.

[0005] Another object of the present invention is to provide a method for preparing modified asphalt coatings.

[0006] Another object of the present invention is to provide an application of modified bitumen coating in the preparation of waterproof bitumen rolls.

[0007] Another object of the present invention is to provide a waterproof bitumen roll.

[0008] In a first aspect, the present invention provides a modified asphalt coating, comprising, by weight, the following raw material components: 40-60 parts modified asphalt, 10-25 parts waste rubber powder, and 0.5-1 part rubber regeneration activator. The rubber regeneration activator mentioned above is bis(2-nitrophenyl) disulfide. The modified asphalt is nanoscale graphene or carbon nanotube modified asphalt.

[0009] In the modified bitumen coating provided by the present invention, preferably, the low-temperature flexibility of the waste rubber is 60% or less of that of the virgin rubber.

[0010] According to the modified asphalt coating provided by the present invention, preferably, the proportion of waste rubber powder in the modified asphalt coating is ≥60wt%.

[0011] In the modified asphalt coating provided by the present invention, preferably, the particle size of the waste rubber powder is 30-80 mesh.

[0012] In the modified bitumen coating provided by the present invention, preferably, the lateral dimension of the nanoscale graphene is 10~100nm.

[0013] The modified bitumen coating provided by the present invention preferably comprises, by weight, the following raw material components: 5-15 parts plasticizer, 3-8 parts nano zinc oxide, 4-10 parts basalt fiber, 5-10 parts SEEPS, 1-3 parts coupling agent, 1-2 parts weathering agent, and 0.02-0.3 parts insoluble sulfur.

[0014] In the modified bitumen coating provided by the present invention, preferably, the particle size of the nano zinc oxide is 30~60nm, and / or the diameter of the basalt fiber is 1~50μm.

[0015] Secondly, the present invention also provides a method for preparing a modified asphalt coating, comprising the following steps: S1. Add graphene or carbon nanotube dispersion to molten asphalt and react at high speed at 180~200℃ for 2~4h to obtain modified asphalt; S2. Maintain the reaction temperature in S1, add a mixture of waste rubber powder and rubber regeneration activator to the modified asphalt, and react at a speed of 100~150 rpm for desulfurization and regeneration. S3. Add other components, maintain the reaction temperature in S1, stir at high speed until the reaction is complete, and obtain the modified asphalt coating.

[0016] Thirdly, the present invention also provides the application of modified bitumen coating in the preparation of waterproof bitumen rolls.

[0017] Fourthly, the present invention also provides a waterproof asphalt roll material, comprising a glass fiber reinforced polyester filament base fabric, a modified asphalt intermediate layer and a PE isolation layer, wherein the modified asphalt intermediate layer comprises the modified asphalt coating.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention provides a modified asphalt coating that regenerates waste rubber powder using a specific rubber regeneration activator and, through synergistic component quality control, significantly improves the regeneration effect of waste rubber powder. Simultaneously, while breaking down the original CS bonds in the rubber powder, sulfur is added post-processing to regenerate CS bonds in the rubber compound, enhancing the overall structure of the material. This further effectively improves the mechanical properties and weather resistance of the modified asphalt coating when applied to the preparation of roll materials.

[0019] The waterproof asphalt membrane provided by this invention has a tensile strength ≥1000N / 50mm (traditional membrane ≤900N / 50mm), puncture resistance ≥300N, tensile strength retention rate ≥85% after 500 hours of accelerated artificial aging (traditional membrane ≤70%), improved heat resistance, good low-temperature flexibility, and excellent mechanical and weather resistance properties. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention. In the embodiments provided in this specification, where specific techniques or conditions are not specified, they are performed according to the techniques or conditions described in the literature in this field, or according to the product instructions. Reagents or instruments whose manufacturers are not specified are all conventional products that can be purchased through legitimate channels.

[0021] The following examples and the raw material information in the degree ratio are explained in detail: Waste rubber powder, sourced from Hangzhou Yusheng Environmental Technology Co., Ltd., with a particle size of 40 mesh, is classified as tire rubber powder. Performance description: The raw material for the rubber powder is waste tires, which are ground into powder. Its low-temperature flexibility is 50% of that of virgin rubber. Nanoscale graphene, manufacturer: Suzhou Yanjiu Technology Co., Ltd., brand name: SmartCme, lateral dimension: 10nm; SEEPS, manufacturer: Shanghai Wanshiyi New Material Technology Co., Ltd., grade: Kuraray 4003 (Japan), styrene content: 30%.

[0022] Nano zinc oxide 1: Manufacturer: Qinghe County Chaotai Metal Materials Co., Ltd., Grade: FZn45, Average particle size is 30nm.

[0023] Nano zinc oxide 2: Manufacturer: Zhejiang Zhitai Nano Micro New Materials Co., Ltd., Grade: VK-J20, average particle size is 20nm.

[0024] Nano zinc oxide 3: Manufacturer: Shandong Ruiqi Chemical Co., Ltd., Brand: Ruiqi, Average particle size is 100nm.

[0025] Basalt fiber: Manufacturer: Wuhe County Weijia Composite Materials Co., Ltd., Performance specifications: Fiber diameter 7~25μm, length 3~4.5mm.

[0026] Rubber regeneration activator: Manufacturer: Hubei Baidu Chemical Co., Ltd., Brand No. 1155-00-6. Performance specifications: Purity ≥ 98%.

[0027] Rubber regeneration activator (bis(2-nitrophenyl) disulfide): Manufacturer: Hubei Baidu Chemical Co., Ltd., Grade 1155-00-6. Performance specifications: Purity ≥98%.

[0028] Rubber regeneration activator (di-sec-butyl disulfide): Manufacturer: Zibo Yujin Trading Co., Ltd., Brand No. 5943-30-6. Performance specifications: Density 0.957 g / cm³.

[0029] Rubber regeneration activator (bis-[3-(triethoxysilyl)propyl]-tetrasulfide): Manufacturer: Qufu Yishun Chemical Co., Ltd., Grade Si-69. Performance specifications: pH value 5.0-7.0.

[0030] Insoluble sulfur: Manufacturer: Kunshan Shengan Biotechnology Co., Ltd., Brand: CAS: 9035-99-8. Performance description: Purity ≥ 98%.

[0031] Fiberglass reinforced polyester filament tire base fabric: Manufacturer: Tiandingfeng Holdings Co., Ltd., Brand: Fiberglass reinforced polyester filament tire base fabric. Specification: Weight ≥ 250 g / m2.

[0032] Other components involved in the embodiments and comparative examples of this invention, such as asphalt, bio-based plasticizer (moringa oil), weathering agent, coupling agent, etc., are all the same product.

[0033] In a specific embodiment, the present invention provides a modified asphalt coating, comprising the following raw material components by weight: 40-60 parts modified asphalt, 10-25 parts waste rubber powder, and 0.5-1 part rubber regeneration activator. The rubber regeneration activator mentioned above is bis(2-nitrophenyl) disulfide. The modified asphalt is graphene or carbon nanotube modified asphalt.

[0034] The research of this invention found that, in the modified asphalt coating system of this invention, selecting the above-mentioned rubber regeneration activators, especially bis(2-ethylhexyl) disulfide, can achieve better controllable fracture of the vulcanization network of waste rubber, further improve the compatibility of modified asphalt and regenerated rubber, thereby significantly improving the utilization rate of waste rubber powder (≥60%) and realizing the deep regeneration of waste rubber.

[0035] Meanwhile, the aforementioned rubber recycling activators are non-toxic disulfide activators, which can replace traditional toxic thiophenol activators, making the waste rubber recycling system more environmentally friendly.

[0036] In the specific implementation scheme, the modified asphalt coating system of the present invention does not contain harmful substances such as aromatic oils and phthalates, and the formula is more green and environmentally friendly.

[0037] In specific embodiments, the waste rubber powder mentioned in this invention can originate from various recycling scenarios such as waste tires, rubber products, and rubber toys. The performance of waste rubber powder is typically lower than that of virgin rubber, with low-temperature flexibility being 60% or less of virgin rubber, and a decrease of 40% or more. Therefore, for the recycling of such waste rubber powder, how to effectively utilize rubber regeneration activators to completely destroy the vulcanization network is crucial. The modified asphalt coating system mentioned in this invention can utilize various waste rubber powder raw materials, all achieving good regeneration effects and system compatibility, thus ensuring excellent performance in the preparation of roll materials.

[0038] In some specific embodiments, appropriately controlling the particle size of waste rubber powder is more conducive to regeneration and activation. Preferably, the particle size of the waste rubber powder mentioned in this invention is 30-80 mesh, and is preferably at least one of natural rubber, styrene-butadiene rubber, and cis-butadiene rubber. For example, the specific particle size of the waste rubber powder can be 30 mesh, 40 mesh, 50 mesh, 60 mesh, 80 mesh, or any range thereof.

[0039] In some specific embodiments, the lateral dimensions of the nanoscale graphene mentioned in this invention are 10~100 nm.

[0040] In this invention, the lateral dimension of the nanoscale graphene refers to the width of the nanoscale graphene. Controlling the lateral dimension of the nanoscale graphene to 10~100nm is more conducive to improving its dispersibility and reducing agglomeration.

[0041] To further improve the mechanical properties and weather resistance of modified asphalt coatings, the modified asphalt coating provided by this invention comprises the following raw material components by weight: 5-15 parts plasticizer, 3-8 parts nano zinc oxide, 4-10 parts basalt fiber, 5-10 parts SEEPS, 1-3 parts coupling agent, and 1-2 parts weather resistant agent.

[0042] The plasticizer mentioned in this invention is preferably a bio-based plasticizer.

[0043] The modified asphalt mentioned in this invention is graphene or carbon nanotube modified asphalt. Through cross-scale compounding of nanoscale graphene, nano zinc oxide (20-50nm) with graphene (nanoscale) and basalt fiber (micrometer scale), a synergistic reinforcement network of "nano-reinforcement-fiber toughening-asphalt compatibility" is constructed, which can significantly improve the mechanical properties and weather resistance of asphalt coatings. Moreover, nano zinc oxide can give modified asphalt coatings excellent antibacterial effects.

[0044] In some specific embodiments, in order to achieve better dispersion and to facilitate the construction of a synergistic reinforcing network of "nano-reinforced-fiber toughened-asphalt compatible", the particle size of the nano zinc oxide mentioned in this invention is preferably controlled to be 30~60nm, for example, it can be a point value of 30nm, 40nm, 50nm, 60nm or any range thereof.

[0045] In some specific embodiments, in order to achieve better dispersion and facilitate the construction of a synergistic reinforcement network of "nano-reinforced - fiber-toughened - asphalt-compatible", the diameter of the basalt fiber mentioned in this invention is preferably controlled to be 1~50μm, more preferably 7~25μm, for example, it can be point values ​​or any range of values ​​such as 5μm, 10μm, 15μm, 20μm, 25μm, 30μm, 35μm, 40μm, 45μm, 50μm.

[0046] The present invention further discovers that when the various materials are controlled within the above-mentioned size range, the synergistic reinforcing network can further improve the mechanical properties and weather resistance of asphalt coatings.

[0047] In some specific embodiments, the bio-based plasticizer mentioned in this invention is a natural plant oil or its derivative, preferably at least one of moringa oil, tall oil, castor oil, and modified plant thiols.

[0048] In some specific embodiments, the bio-based plasticizer accounts for more than 30% of the total mass of the modified asphalt coating system. The bio-based plasticizer has a biodegradability of ≥60%.

[0049] In some specific embodiments, the weathering agent mentioned in this invention can be a mixture of hindered amine light stabilizers (such as bis(2,2,6,6-tetramethylpiperidinol) sebacate (Tinuvin 770), tetramethylpiperidinol benzoate (Tinuvin 144)) and ultraviolet absorbers (benzotriazoles (such as 2-(2'-hydroxy-3',5'-di-tert-butylphenyl)benzotriazole (Tinuvin 320)), benzophenones (such as 2-hydroxy-4-methoxybenzophenone (UV-9)), triazines (2-(4,6-diphenyl-1,3,5-triazine-2-yl)-5-hexyloxyphenol (Tinuvin 1577), 2,4-bis(2,4-dimethylphenyl)-6-(2-hydroxy-4-octyloxyphenyl)-1,3,5-triazine (UV-1164)) etc.).

[0050] In some specific embodiments, the coupling agent mentioned in this invention is at least one of silane coupling agents, titanate coupling agents, and aluminate coupling agents.

[0051] In some specific embodiments, the modified bitumen coating of the present invention also contains insoluble sulfur.

[0052] The raw materials of each component in the modified bitumen coating of the present invention do not need to be specifically limited. Any applicable raw material components known in the art are acceptable. The above are merely further preferred examples.

[0053] In a specific embodiment, the present invention also provides a method for preparing modified asphalt coatings, comprising the following steps: S1. Add graphene or carbon nanotube dispersion to molten asphalt and react at high speed at 180~200℃ for 2~4h to obtain modified asphalt; S2. Maintain the reaction temperature in S1, add a mixture of waste rubber powder and rubber regeneration activator to the modified asphalt, and react at a speed of 100~150 rpm for desulfurization and regeneration. S3. Add other components, maintain the reaction temperature in S1, stir at high speed until the reaction is complete, and obtain the modified asphalt coating.

[0054] In step S1, it is preferable to mix asphalt and bio-based plasticizer and then heat and melt them to obtain melted asphalt.

[0055] In some specific embodiments, more specifically, the preparation method includes: S1. Mix asphalt and bio-based plasticizer and heat to melt until the temperature reaches 180℃~220℃. Hold the temperature for more than 30 minutes to obtain a molten mixture. Then, a nano-scale graphene solution (preferably a xylene solution of nano-scale graphene with a solid content of 1%~3%) is dispersed into the mixture in the molten state at 180℃~200℃, and subjected to a high-speed shear reaction (preferably high-speed shear at 2000~3000rpm) for 2~4 hours to obtain graphene-modified asphalt. S2. Maintain the reaction temperature in S1, and continue to add the mixed waste rubber powder and rubber regeneration activator, and react at a speed of 100~150 rpm for desulfurization and regeneration. S3. Finally, add nano zinc oxide, basalt fiber, weathering agent, coupling agent and SEEPS, maintain the reaction temperature in S1 and stir for more than 120 minutes to complete the reaction, then add insoluble sulfur and stir for 60 minutes to obtain the modified asphalt coating.

[0056] In some specific embodiments, in step S3 of the preparation method of the modified asphalt coating of the present invention, some substances containing elemental sulfur may be added to promote the re-crosslinking of rubber after desulfurization. The above preparation method is a complete preparation method of modified asphalt coating including dynamic desulfurization-cross-scale reinforcement-green molding. The dynamic desulfurization process of this preparation method shortens the regeneration time by more than 20% and reduces energy consumption by more than 15%; in addition, this preparation method disperses graphene in the asphalt in advance, making the material system more uniform and stable.

[0057] Furthermore, the preparation method provided by this invention can complete the recycling of waste rubber powder and the preparation of modified asphalt coatings in one step, which is highly efficient and convenient.

[0058] In a specific embodiment, the present invention also provides the application of modified bitumen coating in the preparation of waterproof bitumen rolls.

[0059] In a specific embodiment, the present invention also provides a waterproof asphalt roll material, comprising a glass fiber reinforced polyester filament base fabric, a modified asphalt intermediate layer and a PE isolation layer, wherein the modified asphalt intermediate layer comprises the modified asphalt coating.

[0060] In some specific embodiments, the modified asphalt intermediate layer mentioned in this invention may further include the following components: polypropylene wax and filler. Polypropylene wax improves heat resistance, and the filler serves a filling function.

[0061] In some specific embodiments, the present invention also provides a method for preparing waterproof asphalt roll material, comprising the following steps: After the fiberglass-reinforced polyester filament base fabric is dried, it is transported by rollers to a coating tank containing asphalt coating material for impregnation. The asphalt tank contains a mixture of 70# asphalt and 10# asphalt (mass ratio 1:1). After impregnation, the rollers continue to transport the fiberglass-reinforced polyester filament base fabric to the discharge port (modified asphalt intermediate layer coating). There are two rollers with a spacing of 4mm in front of the discharge port, which compress the modified asphalt intermediate layer coating and the base fabric. After passing through a PE isolation layer and a prototype roll, it is cooled in a water tank (30~40°C). After being conveyed and wound up by a conveyor belt, the final product, an environmentally friendly, weather-resistant, and high-strength waterproof asphalt roll, is obtained.

[0062] Examples 1-6 This embodiment provides a modified asphalt coating, the raw materials of which include the components shown in Table 1 by weight as follows: Table 1

[0063] Example 7 A method for preparing a modified asphalt coating is as follows: S1. Asphalt and bio-based plasticizer are added to a reaction vessel, mixed, and heated to melt. When the temperature reaches 180℃, the mixture is held for 30 minutes to obtain a molten mixture. Then, nano-scale graphene is dispersed in xylene solvent (solid content is 1%), ultrasonically treated for 30 minutes, and then dispersed into the molten mixture at 180℃. After high-speed shearing at 2000 rpm for 2 hours, graphene-modified asphalt is obtained. S2. Maintain the reaction temperature in S1, mix the waste rubber powder with the rubber regeneration activator, put it into the reactor, and then dynamically desulfurize it at 100 rpm for 120 min. The sulfur bonds are broken through the sulfur exchange reaction to regenerate the waste rubber. S3. Add each component to the reactor and stir at high speed at 180°C for 120 minutes to obtain the modified asphalt coating.

[0064] The modified bitumen coatings of Examples 1-6 were prepared by referring to the above method.

[0065] Example 8 A waterproof asphalt roll material includes a glass fiber reinforced polyester filament base fabric layer, a modified asphalt layer, and a PE isolation layer stacked sequentially; the modified asphalt layer contains the modified asphalt coating prepared in this embodiment.

[0066] After the fiberglass-reinforced polyester filament base fabric is dried, it is transported by rollers to a coating tank containing asphalt coating material for impregnation. The asphalt tank contains a mixture of 70# asphalt and 10# asphalt (mass ratio 1:1). After impregnation, the rollers continue to transport the fiberglass-reinforced polyester filament base fabric to the discharge port (modified asphalt intermediate layer coating). There are two rollers with a spacing of 4mm in front of the discharge port, which compress the modified asphalt intermediate layer coating and the base fabric. After passing through a PE isolation layer and a prototype roll, it is cooled in a water tank (30~40°C). After being conveyed and wound up by a conveyor belt, the final product, an environmentally friendly, weather-resistant, and high-strength waterproof asphalt roll, is obtained.

[0067] Comparative Example 1 This comparative example provides a modified asphalt coating, the raw materials of which include the components shown in Table 1 by mass, the difference being that the rubber regeneration activator is bis-[3-(triethoxysilyl)propyl]-tetrasulfide.

[0068] Modified asphalt coatings were prepared according to the method of Example 7, and corresponding waterproof asphalt rolls were prepared according to the method of Example 8.

[0069] Comparative Example 2 This comparative example provides a modified asphalt coating whose raw materials include the components shown in Table 1 by mass, the difference being that the rubber regeneration activator is di-sec-butyl disulfide.

[0070] Modified asphalt coatings were prepared according to the method of Example 7, and corresponding waterproof asphalt rolls were prepared according to the method of Example 8.

[0071] Comparative Example 3 This comparative example provides a modified asphalt coating that is basically the same as that in Example 1, except that the amount of rubber regeneration activator is 1.2 parts.

[0072] Modified asphalt coatings were prepared according to the method of Example 7, and corresponding waterproof asphalt rolls were prepared according to the method of Example 8.

[0073] Result detection This test example evaluates the performance of the waterproof bitumen rolls prepared in the above embodiments and comparative examples. The specific steps are as follows: Mechanical properties: The test method for tensile strength is as follows: GB18242-2008, section 6.11. The test method for puncture resistance is as follows: GB / T23457-2017, section 6.11. Weather resistance: In GB / T23457-2017, 6.20.4, the time is extended to 500h. The test method for heat resistance is as follows: GB18242-2008, section 6.8. The test method for low-temperature flexibility is as follows: GB18242-2008, 6.9. The test results are shown in Table 2.

[0074] Table 2

[0075] Among them, low temperature flexibility / ℃ indicates the lowest temperature limit at which waterproof asphalt membrane can maintain its flexibility without becoming brittle or cracking in a low temperature environment. The lower the value, the better the low temperature resistance of the material.

[0076] Accelerated aging / % refers to the retention rate of tensile strength of waterproof bitumen rolls relative to their initial state after a simulated accelerated aging test. It is usually expressed as a percentage and is used to evaluate the aging resistance of materials.

[0077] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A modified bituminous coating, characterized in that, The modified asphalt is modified by nano graphene or carbon nanotube. The low-temperature flexibility of the waste rubber powder is 60% or less of that of virgin rubber. The waste rubber powder accounts for ≥60wt% in the modified asphalt coating.

2. The modified bitumen coating of claim 1, wherein, The average particle size of the waste rubber powder is 30-80 mesh.

3. The modified asphalt coating of claim 1, wherein, The lateral size of the nano graphene is 10-100 nm.

4. The modified asphalt coating of claim 1, wherein, The modified asphalt coating further comprises the following raw material components in parts by weight: plasticizer 5-15 parts, nano zinc oxide 3-8 parts, basalt fiber 4-10 parts, SEEPS 5-10 parts, coupling agent 1-3 parts, and weathering agent 1-2 parts.

5. The modified asphalt coating of claim 1, wherein, The particle size of the nano zinc oxide is 30-60 nm, and / or the diameter of the basalt fiber is 1-50 μm.

6. The modified bitumen coating of any one of claims 1 to 5, wherein the modified bitumen coating is a modified bitumen roofing membrane. The modified asphalt coating comprises the following steps:

7. The modified bitumen coating of claim 6, wherein the bitumen is a SBS modified bitumen. S1. Adding graphene or carbon nanotube dispersion liquid into molten asphalt, and performing high-speed shearing reaction at 180-200 ℃ for 2-4 h to obtain modified asphalt; 8. A method for producing the modified bitumen coating material according to any one of claims 1 to 7, characterized by, S2. Maintaining the reaction temperature in S1, adding a mixture of waste rubber powder and rubber reactivation agent into the modified asphalt, and performing desulfurization regeneration at a rotation speed of 100-150 rpm; S3. Adding other components, maintaining the reaction temperature in S1, and performing high-speed stirring reaction until completion to obtain the modified asphalt coating.

9. Use of the modified asphalt coating according to any one of claims 1-7 in the preparation of waterproof asphalt coiled material. The waterproof asphalt coiled material comprises glass fiber reinforced polyester filament tire base cloth, modified asphalt intermediate layer, and PE isolation layer, and the modified asphalt intermediate layer comprises the modified asphalt coating according to any one of claims 1-7. ​ 10. A waterproof bituminous sheet material, characterized by ​

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