An asphalt coating material for a waterproofing membrane, a method of preparing the same, and an asphalt waterproofing membrane

Abstract

The present application relates to a kind of asphalt coating for waterproofing membrane and its preparation method and application.The present application provides a kind of asphalt coating, which includes: A) asphalt main agent, including matrix asphalt, asphalt modifier, softening agent and filler;B) polyisocyanate or its prepolymer;C) foaming agent;D) auxiliary agent, including water, surfactant and catalyst.The asphalt coating of the present application can form stable porous structure inside the membrane by the synergistic foaming effect of polyisocyanate and foaming agent, and new modified asphalt membrane with low density, heat resistance and reliable waterproofing can be obtained.

Description

Technical Field

[0001] This invention relates to the field of building waterproofing materials technology, particularly to the improvement of the structure and performance of waterproof membranes, specifically to an asphalt coating for waterproof membranes, its preparation method, and an asphalt waterproof membrane made using the coating. Background Technology

[0002] Asphalt waterproofing membranes play a vital role in the construction industry, providing reliable waterproofing protection for structures such as roofs, basements, roads, and tunnels. Traditionally, these membranes typically use a thick, heavy layer of asphalt material, combined with a large amount of rubber powder, stone powder, and other materials. The filler usually accounts for about 30% of the total material. While offering significant waterproofing, this also results in problems such as heavy weight and inconvenient installation and handling. Furthermore, traditional asphalt membranes easily absorb heat, leading to performance degradation and accelerated aging in high-temperature environments, thus affecting their service life.

[0003] To address the need for lightweight roofing membranes, existing technologies have attempted to reduce membrane density by adding lightweight fillers, but these methods still have significant limitations. For example, CN 102304288 A uses hollow vitrified microspheres made from volcanic ash or perlite to replace some mineral powder as filler, and CN 118810185A, based on a similar principle, uses extremely lightweight fly ash / ultrafine fly ash as filler to prepare waterproof roofing membranes. However, the large density difference between lightweight fillers and asphalt makes it difficult to disperse evenly in high-viscosity asphalt systems, easily leading to agglomeration, floating, or stratification during production, resulting in unstable product performance. While some foamed asphalt technologies can introduce porous structures, traditional asphalt materials have strong adhesion, easily causing the microporous structure to stick, collapse, or disappear during processing, making it difficult to form a stable, dense, and long-lasting microporous network, thus failing to effectively balance the needs of waterproofing and effective weight reduction.

[0004] Against the backdrop of the industry's increasing demand for energy-saving integration, lightweight construction and high-performance roll materials, it is necessary to develop a new type of modified bitumen roll material that can form a stable porous structure inside the roll material, while also having low density, heat resistance and waterproof reliability. Summary of the Invention

[0005] The purpose of this invention is to provide an asphalt coating material for waterproof membranes, a method for preparing the same, and an asphalt waterproof membrane made from the coating material, in order to solve the technical problems of traditional membranes, such as difficulty in achieving both waterproof performance and effective weight reduction, and uncontrollable pore structure.

[0006] To achieve this objective, the present invention provides the following technical solution:

[0007] A bitumen coating for waterproof membranes, the bitumen coating comprising: A) Asphalt base agent; B) Polyisocyanates or their prepolymers; C) Foaming agent; D) Additives; Component A) Asphalt main agent includes base asphalt, asphalt modifier, softener and filler; The additives include water, surfactants, and catalysts for reacting component B with active hydrogen compounds.

[0008] Furthermore, the present invention also provides a method for preparing the asphalt coating of the present invention, comprising the following steps: Component C) and component D) are mixed to prepare a slurry; The base asphalt is heated, the softener is added, and the mixture is stirred until homogeneous. The temperature is then increased, and the asphalt modifier and filler are added sequentially to prepare component A. Add component B) to component A), then add the slurry, and stir until the material volume expands to obtain the asphalt coating.

[0009] Furthermore, the present invention also provides a bitumen waterproof membrane made using the coating material, comprising a substrate layer and a bitumen coating layer formed by the bitumen coating material of the present invention.

[0010] This invention introduces component B into an asphalt coating, enabling it to chemically react with the asphalt matrix and construct a highly cross-linked three-dimensional network structure within the coating system. This three-dimensional structure not only improves the system's stability but also provides a chemical and spatial basis for the subsequent formation of pore structures. Simultaneously, component B can also react with the asphalt matrix and component D, thereby generating a controllable number of tiny gas "nuclei" within the coating.

[0011] When the subsequently introduced component C decomposes to generate gas, it can further form a large number of uniform and fine bubbles based on the aforementioned "crystal nuclei". Furthermore, thanks to the cross-linked and reinforced coating matrix, these microbubbles can maintain good mechanical stability and are not prone to collapse during subsequent storage and pipeline transportation.

[0012] After the coating is applied to the base material and cools and solidifies, a stable closed-cell structure is formed internally, characterized by a relatively uniform distribution, small particle size, and most particles being non-interconnected, thus obtaining a foamed asphalt membrane. The closed-cell structure of this invention refers to air bubbles dispersed within the asphalt material, with the pore walls being asphalt material, and no pores penetrating the asphalt material, ensuring sufficient waterproofing of the asphalt membrane. The porous structure of this invention significantly reduces the density of the coating material; compared to traditional coating materials, the density can be reduced by more than 20%, achieving a significant lightweighting of the membrane. Furthermore, the single-stage mixing and foaming process eliminates the need for complex cavity implantation or multiple heat treatments, resulting in a waterproof membrane with better heat resistance while maintaining its original low-temperature flexibility and waterproofing performance.

[0013] It should be noted that the above description does not disclose all embodiments of the present invention or all advantages of the present invention. Detailed Implementation

[0014] The following describes embodiments of the present invention, but the invention is not limited thereto. The present invention is not limited to the configurations described below; various modifications can be made within the scope of the claims. Embodiments and examples obtained by appropriately combining the disclosed technical means in different embodiments and examples are also included within the technical scope of the present invention. Furthermore, all documents described in this specification are incorporated herein by reference.

[0015] Unless otherwise defined, the technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0016] In the context of describing this specification (especially in the context of the appended claims), the terms “a,” “an,” and “the (described)” and similar language will be interpreted to cover both the singular and the plural, unless otherwise indicated herein or clearly contradicted by the context.

[0017] In this specification, the range of values ​​referred to as “value A ~ value B” or “value A - value B” refers to the range that includes the endpoint values ​​A and B and all ranges between the endpoints.

[0018] In this specification, the word "may" generally includes both the meaning of performing a certain treatment and the meaning of not performing a certain treatment. It should be noted that in this specification, the word "may" in "chemically crosslinkable monomers and / or prepolymers" means "can".

[0019] In this specification, "optional" or "optionally" means that the event or situation described below may or may not occur, and the description includes both the scenario in which the event occurs and the scenario in which the event does not occur.

[0020] In this specification, the terms "some specific / preferred embodiments," "other specific / preferred embodiments," "some specific / preferred technical solutions," and "other specific / preferred technical solutions" refer to specific elements (e.g., features, structures, properties, and / or characteristics) related to the described embodiment that are included in at least one of the embodiments described herein, and may or may not exist in other embodiments. Furthermore, it should be understood that these elements can be combined in any suitable manner in various embodiments.

[0021] In this specification, the term "comprising" and any variations thereof are intended to cover non-exclusive inclusion. The use of phrases such as "does not contain" or "does not include" is not intended to exclude the presence of trace amounts of related compounds or chemical structures that may be present but were not intentionally used, such as environmental contaminants.

[0022] For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the steps or units listed, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to such processes, methods, products, or devices.

[0023] In this specification, expressions such as "containing A, B and / or C" or "including A, B and / or C" mean containing A or B or C, or containing any two of A and C, or containing all three of A, B and C.

[0024] In this specification, the term "organic" refers to a carbon-containing compound.

[0025] In this specification, the term "inorganic" refers to compounds that do not contain carbon atoms except for carbonates and oxides of carbon.

[0026] In this specification, the term "polymer" refers to a molecule comprising a large number of similar units bonded together by covalent bonds.

[0027] Asphalt coating

[0028] This invention provides an asphalt coating material for waterproof membranes, the asphalt coating material comprising: A) Asphalt base agent; B) Polyisocyanates or their prepolymers; C) Foaming agent; D) Additives; Component A) Asphalt main agent includes base asphalt, asphalt modifier, softener and filler; The additives include water, surfactants, and catalysts for reacting component B with active hydrogen compounds.

[0029] In this invention, each component of the raw material can be used alone, or two or more components can be used in combination in a desired proportion. Each component will be explained in detail below.

[0030] Component A)

[0031] Component A) of this invention is an asphalt base agent, which includes at least a base asphalt, an asphalt modifier, a softener, and a filler. The asphalt base agent is the matrix material of the coating, mainly providing waterproofing, formability, and mechanical strength. The base asphalt, as the continuous phase and main binder phase, provides the coating with basic adhesion, waterproofing, and film-forming properties. The asphalt modifier improves high and low temperature performance, elasticity / extensibility, and processing stability. The softener, which can also be called a softening oil, differs from the asphalt modifier and is mainly used to adjust the system viscosity and improve the compatibility between the asphalt modifier and the asphalt. The filler adjusts density, mechanical properties, and cost, and can also serve as an auxiliary agent for structural / phase stabilization.

[0032] In some specific embodiments of the present invention, the base asphalt can be selected from one or more combinations of penetration grades 10, 30, 70, 90, and 200 asphalt, all of which are commercially available. In some specific embodiments of the present invention, grade 10 and / or grade 30 asphalt accounts for 3-80% of the base asphalt; in other specific embodiments of the present invention, grade 70 and / or grade 90 asphalt accounts for 10-80%; and in other specific embodiments of the present invention, grade 200 asphalt accounts for 5-50%. Preferably, the present invention employs a compound system of two different grades of asphalt to comprehensively balance the processing properties of the system, such as softening point, ductility, and viscosity. In some specific embodiments of the present invention, the compound system is a mixture of high-grade asphalt (such as grade 70 or 90) and low-grade asphalt (such as grade 200). More preferably, based on the total mass of the compound base asphalt, the mass percentage of the high-grade asphalt (grade 70 and / or 90) is 80% to 90%, and the mass percentage of the low-grade asphalt (grade 200) is 10% to 20%.

[0033] In some specific embodiments of the present invention, the asphalt modifier is selected from one or more combinations of thermoplastic elastomers, polyolefins, and rubber powder. Preferably, the thermoplastic elastomer is composed of styrene block copolymers, such as SBS, SEBS, SIS, etc. More preferably, the thermoplastic elastomer is SBS, i.e., styrene-butadiene-styrene triblock copolymer, which commonly has linear and star structures. It can effectively improve the stiffness and toughness of the asphalt system, improve fatigue resistance, and water damage resistance, and also has the ability to increase the softening point and ductility of asphalt. In some specific embodiments of the present invention, the thermoplastic elastomer is selected from one or both of SBS star structure (e.g., weight-average molecular weight of 210,000 to 250,000) and SBS linear structure (e.g., weight-average molecular weight of 80,000 to 100,000). In some specific embodiments of the present invention, the polyolefin used as the asphalt modifier can be selected from one or more of the following types: atactic polypropylene, polyethylene, polypropylene, and ethylene-vinyl acetate copolymer. In some specific embodiments of the present invention, the asphalt modifier also includes rubber powder. Rubber powder used as an asphalt modifier includes granular materials obtained by crushing waste tires and other rubber products. Its main function is to enhance the elasticity, toughness, fatigue resistance, and crack resistance of asphalt, while simultaneously achieving resource recycling. The mesh size of the rubber powder can range from 40 to 120 mesh. Rubber powder with a relatively coarse particle size (e.g., 40 to 80 mesh) is preferred because it can form a more effective three-dimensional elastic network structure in the asphalt system. The rubber powder can be commercially available waste rubber powder. In some specific embodiments of the present invention, the asphalt modifier is selected from thermoplastic elastomers and rubber powder, both of which are commercially available. In some other embodiments of the present invention, based on 100 parts by weight of base asphalt, the amount of asphalt modifier is 15 to 45 parts by weight, preferably 25 to 40 parts by weight. Preferably, based on 100 parts by weight of base asphalt, the amount of thermoplastic elastomer is 5 to 20 parts by weight, further 10 to 18 parts by weight, and the amount of rubber powder is 10 to 25 parts by weight, further 12 to 20 parts by weight. This range of amounts can effectively improve the asphalt properties without excessively increasing the viscosity of the system.

[0034] In some specific embodiments of the present invention, the softener is selected from one or more of aromatic oils and naphthenic oils. Preferably, the softener is selected from aromatic oils. Further, the softener is a reduced-density (RDD) oil and / or a reduced-density (RDD) oil, which has a high aromatic hydrocarbon content, good compatibility with asphalt, and can effectively reduce viscosity. In some specific embodiments of the present invention, based on 100 parts by weight of base asphalt, the amount of softener is 2 to 15 parts by weight, preferably 5 to 13 parts by weight.

[0035] In some specific embodiments of the present invention, the filler is selected from one or more of inorganic powders or organically modified layered silicates. Preferably, the inorganic powder is selected from one or more combinations of talc, calcium stearate, and calcium carbonate. More preferably, the mesh size of the powder is in the range of 200 mesh to 400 mesh to ensure its uniform dispersion in the system. In other specific embodiments of the present invention, the organically modified layered silicates include, but are not limited to, organically modified montmorillonite (such as quaternary ammonium salt surface-treated montmorillonite) or organically modified bentonite. These materials, through ion exchange or surface modification, introduce organic groups, which can significantly enhance compatibility with the asphalt matrix and improve the thixotropic and anti-settling properties of the system. The filler of the present invention is commercially available. Based on the total mass of the asphalt coating, the amount of the filler does not exceed 20.0 wt%, preferably 5.0 wt% to 15.0 wt% (e.g., 10 wt%, 12 wt%, 13 wt%, or 15 wt%), which can achieve the goal of lightweighting while ensuring the mechanical properties and processing stability of the roll material. In some specific embodiments of the present invention, the filler may also include a small amount of lightweight fillers such as fly ash and hollow vitrified microspheres, as needed. However, in order to better obtain the technical effects of the present invention, in the preferred embodiment of the present invention, the filler does not include lightweight fillers such as fly ash and hollow vitrified microspheres.

[0036] In some specific embodiments of the present invention, component A) may further include a plasticizer, suitable plasticizers include but are not limited to dioctyl maleate, tributyl acetyl citrate, etc., and the amount added is 0.0~5.0 wt% based on the total mass of the asphalt main agent, preferably 1.0~3.0 wt%, and more preferably 2.0~3.0 wt%.

[0037] Component B)

[0038] Component B of this invention is a polyisocyanate or its prepolymer, also referred to as "isocyanate" in this invention. As a component capable of chemically reacting with active hydrogen compounds in the asphalt matrix, it is used to construct a cross-linked structure within the coating system, improving the system's mechanical stability, heat resistance, and support capacity during pore formation. Furthermore, component B can react with carboxyl groups in the asphalt matrix, a small amount of water that may be present in the asphalt matrix, and water in the additives to produce carbon dioxide. Carbon dioxide serves as an initial gas source, forming gas "nuclei," making the bubbles generated by the subsequent foaming agent easier to disperse and more stable. Polyisocyanates are a general term for compounds containing two or more isocyanate groups (understood by those skilled in the art, referring to free isocyanate groups with a general structure of –N=C=O). The simplest and most important representatives of these polyisocyanates are diisocyanates. They have a general structure O=C=NRN=C=O, where R typically represents an aliphatic, alicyclic, and / or aromatic group. Examples of polyisocyanates of the present invention include aliphatic polyisocyanates, alicyclic polyisocyanates, aromatic aliphatic polyisocyanates, aromatic polyisocyanates, and derivatives of these polyisocyanates. They can be used alone or in combination of two or more. Examples of polyisocyanates of the present invention include trimethylene diisocyanate, tetramethylene diisocyanate, pentamethylene diisocyanate, hexamethylene diisocyanate, heptamethylene diisocyanate, octamethylene diisocyanate; 2-methylpentenyl-1,5-diisocyanate, 2-ethylbutenyl-1,4-diisocyanate, 1,4-butenyl diisocyanate, 1-isocyano-3,3,5-trimethyl-5-isocyanate methylcyclohexane; 1,4-bis(methylisocyanate)cyclohexane; 1,4-cyclohexane diisocyanate; 1-methyl-2,4-cyclohexane diisocyanate; 1-methyl-2 6-Cyclohexane diisocyanate; 2,2'-Dicyclohexylmethane diisocyanate; 2,4'-Dicyclohexylmethane diisocyanate; 4,4'-Dicyclohexylmethane diisocyanate; 2,2'-Diphenylmethane diisocyanate; 2,4'-Diphenylmethane diisocyanate; 4,4'-Diphenylmethane diisocyanate; 1,5-Naphthalene diisocyanate; 2,4-Toluene diisocyanate; 2,6-Toluene diisocyanate; Diphenylmethane diisocyanate; 3,3'-Dimethylbiphenyl diisocyanate; 1,2-Diphenylethane diisocyanate and phenyl diisocyanate; and any mixture thereof. Polyisocyanate prepolymers include NCO-terminated prepolymers obtained by self-polymerization of the aforementioned diisocyanates or by partial reaction of the aforementioned diisocyanates with polyols, such as MDI-based prepolymers and low-free monomer prepolymers based on mixed polyisocyanates. These prepolymers have low volatility and regulated reactivity, making them suitable for use in high-temperature asphalt systems.Preferably, the polyisocyanate of the present invention is selected from one or more combinations of toluene diisocyanate (TDI), diphenylmethane diisocyanate (MDI), polymethylene polyphenyl isocyanate (PAPI), isophorone diisocyanate (IPDI), hexamethylene diisocyanate (HDI) and their prepolymers, and more preferably, the polyisocyanate of the present invention is selected from one or more of MDI, polymeric MDI and / or liquefied MDI.

[0039] Polyisocyanates can be obtained by reacting an excess of isocyanate with water or polyols (such as ethylene glycol, propylene glycol, 1,3-butanediol, hexanediol, etc.), or by reacting isocyanate with itself. The polyisocyanates used in this invention are commercially available. Commercial suppliers include Bayer, BASF, and Asahi Kasei Corporation, and suitable polyisocyanates are sold under trade names such as Desmodur, Basonate, and Lupranate / Lupranat.

[0040] In some embodiments of the present invention, the NCO content of the polyisocyanate (i.e., the content of -N=C=O functional groups in the polyisocyanate, expressed as a percentage by mass) is 5% or more, preferably 10%-32%.

[0041] In some specific embodiments of the present invention, based on 100 parts by weight of component A), component B) is 1 to 10 parts, preferably 2 to 5 parts. Excessive dosage may lead to increased system viscosity, reduced fluidity, or even excessive cross-linking, affecting the uniformity of the foamed structure.

[0042] Component C)

[0043] Component C) of the present invention is a foaming agent. In some preferred embodiments of the present invention, the foaming agent of component C) releases gas through thermal decomposition, which works synergistically with the initial "crystal nuclei" generated by component B) to form uniformly distributed microbubbles in the asphalt coating system. It is a key component for constructing a lightweight, closed-cell structure.

[0044] In some specific embodiments of the present invention, component C) is a chemical foaming agent, which can be selected from one or more combinations of the following three categories: (1) Azo compound foaming agents, including but not limited to: azodicarbonamide, azobisisobutyronitrile, etc. Among them, azodicarbonamide is preferred, and its decomposition products are mainly nitrogen (N2), carbon monoxide (CO) and carbon dioxide (CO2). It has a high gas generation rate and is non-toxic and odorless, and is well matched with the high-temperature processing conditions of asphalt; (2) Sulfonyl hydrazine foaming agents, including but not limited to: benzenesulfonyl hydrazine, 4,4'-oxobisbenzenesulfonyl hydrazine, p-toluenesulfonyl hydrazine, etc. This type of foaming agent has a relatively low decomposition temperature and decomposes to produce nitrogen and water vapor, and the gas release is more stable; (3) N-nitroso compound foaming agents, including but not limited to: N,N'-dinitrospentamethylenetetramine. This foaming agent can release gas quickly in this system and is suitable for synergy with NCO-containing systems, which is conducive to forming a finer bubble structure. These chemical foaming agents are all commercially available. The aforementioned chemical foaming agents can be used alone or in combination according to foaming rate requirements and pore structure design goals.

[0045] In some specific embodiments of the present invention, the decomposition temperature of the chemical foaming agent should be between 150°C and 220°C to ensure that it can effectively decompose and foam during high-temperature mixing of the asphalt coating, while avoiding premature decomposition during storage or early processing. In some specific embodiments of the present invention, based on 100 parts by weight of component A (asphalt main agent), the amount of the foaming agent is 0.1 to 10 parts by weight, preferably 0.2 to 2 parts by weight (e.g., 0.3 parts by weight, 0.4 parts by weight, 0.5 parts by weight, 0.6 parts by weight, 1.0 parts by weight).

[0046] Component D)

[0047] Component D) of this invention is an additive that mainly functions in the asphalt coating system to regulate the reaction rate, improve the foaming process, enhance interfacial compatibility, and strengthen the stability of the cell structure. Without component D), a stable closed-cell structure cannot be formed. The additive comprises water, surfactants, and a catalyst for catalyzing the reaction between component B) and active hydrogen compounds, and may further include polyols, organic acids and their salts, metal oxides, etc., as needed.

[0048] The water in the additive can react with the active isocyanate groups of component B to generate CO2, thereby creating initial tiny gas "nuclei" that provide "nucleation sites" for the bubbles generated by the subsequent decomposition of the blowing agent, significantly improving the stability of the final cell structure. The amount of water used is mainly determined by the viscosity and stability of component D. In some specific embodiments of the present invention, the water accounts for 1.0 wt% to 10.0 wt% of the mass of the additive (component D). Preferably, this mass percentage is 2.0 wt% to 5.0 wt%, for example, 2.5 wt%, 3.0 wt%, or 4.0 wt%.

[0049] Surfactants are mainly used to regulate interfacial tension, improve bubble formation, diffusion, and stability, and enhance material flowability. In some specific embodiments of the present invention, the surfactant is an organosilicon nonionic surfactant and / or an N-vinylamide nonionic surfactant. Preferably, the surfactant includes at least an organosilicon nonionic surfactant. Organosilicon surfactants use polysiloxanes as a hydrophobic backbone and achieve their amphiphilic structure through grafting hydrophilic groups such as polyethers. They possess low surface tension, high thermal stability, and chemical inertness, making them particularly suitable for high-temperature processing environments in asphalt systems. Examples include, but are not limited to, polyether-modified silicone oils such as side-chain or end-group polyether-modified polysiloxanes, silanol-terminated polyoxyethylene ethers, and one or more organosilicon-polyether copolymers. Preferably, the organosilicon nonionic surfactant is a polyether-modified silicone oil, whose polyether segments (such as ethylene oxide / propylene oxide copolymers) provide a suitable hydrophilic-lipophilic balance (HLB value), allowing it to maintain good compatibility and spreadability in high-temperature asphalt systems, thereby ensuring a uniform and controllable foaming process. N-vinylamide nonionic surfactants, such as polyvinylpyrrolidone (PVP), possess excellent emulsifying, dispersing, solubilizing, film-forming, and colloidal protection properties. These surfactants are commercially available, for example, from Dow and Wacker. In some specific embodiments of the present invention, the organosilicon surfactant constitutes 5.0 wt% to 85.0 wt% of the auxiliary agent (component D). Preferably, this mass percentage is 10.0 wt% to 80.0 wt%, for example, 12.0 wt%, 20.0 wt%, 47.0 wt%, or 68.0 wt%. In some specific embodiments of the present invention, the N-vinylamide nonionic surfactant (polyvinylpyrrolidone) constitutes 0.1 wt% to 10 wt% of the auxiliary agent (component D). Preferably, this mass percentage is 0.3 wt% to 5.0 wt%.

[0050] Catalysts accelerate the reaction of component B) with active hydrogen compounds and can also be called polyurethane catalysts. They improve the crosslinking efficiency of the system, coordinate the volume expansion process with the foaming process, and facilitate the construction of a more robust three-dimensional framework structure. Catalysts used to promote isocyanate reactions include: amine catalysts, such as triethylenediamine, N,N-dimethylcyclohexylamine, N,N-dimethylethanolamine, bis(2-dimethylaminoethyl) ether, etc.; organometallic catalysts, such as tin catalysts (e.g., dibutyltin dilaurate), organobismuth compounds (e.g., bismuth neodecanoate), organozinc compounds (e.g., zinc isooctanoate), etc. The above catalysts can be used alone or in combination. The amount of catalyst used can be determined according to actual needs.

[0051] In some specific embodiments of the present invention, the additive may further include a polyol, which can participate in the NCO reaction as a co-reactant for chain growth, thereby adjusting the crosslinking density and enhancing the toughness of the cell walls and the overall mechanical properties. Suitable polyols include polyether polyols, polyester polyols, polycarbonate polyols, and C2–C... 10 Aliphatic polyols, etc., preferably, the polyols are selected from polyether polyols, C2–C 10 One or more aliphatic polyols, such as polypropylene glycol, polypropylene triol, 1,4-butanediol (BDO), polytetrahydrofuran glycol (PTMG), and trimethylolpropane (TMP), or a combination thereof, more preferably, for further improvement of water resistance, the polyol is selected from polyether polyols. In some specific embodiments of the invention, the polyol accounts for 10.0 wt% to 80.0 wt% of the mass percentage in the auxiliary agent (component D). Preferably, this mass percentage is 15.0 wt% to 75.0 wt%.

[0052] In some specific embodiments of the present invention, the additive may further include chelating agents and / or foaming agents to regulate the reaction rate, improve the thixotropic properties of the system, and enhance cell stability. Preferably, the chelating agent is selected from one or more of polycarboxylic acids, hydroxycarboxylic acids, aminopolycarboxylic acids, or their salts having 2-10 carbon atoms; specifically, the chelating agent is selected from one or more of citric acid, tartaric acid, malic acid, ethylenediaminetetraacetic acid and its salts, and gluconic acid. In some specific embodiments of the present invention, the foaming agent is selected from one or more of fatty acid metal salts and metal oxides having 8-20 carbon atoms. The foaming agent can promote bubble nucleation, stabilize cell structure, or regulate melt viscosity. Specifically, the foaming agent is selected from metal soaps (metal carboxylates), such as calcium stearate, magnesium stearate, and zinc laurate; metal oxides such as magnesium oxide and zinc oxide, preferably zinc oxide, which can improve the thermal stability and mechanical properties of the system. In some specific embodiments of the present invention, the chelating agent and / or foaming agent constitute from 0.0 wt% to 20.0 wt% of the additive (component D). Preferably, the mass percentage is from 1.0 wt% to 15.0 wt%, for example, 1.0 wt%, 5.0 wt%, or 13.0 wt%.

[0053] In some specific embodiments of the present invention, the amount of component D is 1.0 to 5.0 wt% of the total mass of the asphalt coating, preferably 2.0 to 4.0 wt%, such as 2.5 wt%, 2.7 wt%, and 3.4 wt%. In some specific embodiments of the present invention, additive D includes 10 to 50 parts of polyol, 1 to 10 parts of water, 0 to 5 parts of citric acid, 0 to 5 parts of zinc stearate and / or 0 to 12 parts of zinc oxide, 30 to 80 parts of surfactant, and 0.1 to 0.5 parts of catalyst.

[0054] Preparation method of asphalt coating

[0055] The present invention also provides a method for preparing the asphalt coating of the present invention, which includes the following steps: Component C) and component D) are mixed to prepare a slurry; The base asphalt is heated, the softener is added, and the mixture is stirred until homogeneous. The temperature is then increased, and the asphalt modifier and filler are added sequentially to prepare component A. Add component B) to component A), then add the slurry, and stir until the material volume expands to obtain the asphalt coating.

[0056] The method of this invention ensures sufficient reaction and uniform dispersion among the components, ultimately forming a lightweight coating material with a stable pore structure. The method includes the following steps: S1. Slurry pre-preparation In some specific embodiments of the present invention, the components of component D are first mixed to prepare component D, and then component C is added to component D at room temperature and stirred (e.g., at a speed of 200-400 rpm for 1-15 minutes) until a uniform suspension slurry is formed. This step aims to pre-disperse the foaming agent and other functional additives in the aqueous phase to avoid uneven dispersion or premature decomposition caused by directly adding the powdered foaming agent at high temperature later.

[0057] S2. Preparation of Asphalt Main Agent (Component A)

[0058] S2.1. Base Asphalt Pretreatment: The selected grade of base asphalt (such as No. 70, No. 90 or its compound asphalt) is put into the reactor and heated to the first temperature range of 140-160℃ (e.g. 150℃) to give it good fluidity.

[0059] S2.2. Adding softener: Under continuous stirring (e.g., at a speed of 150-250 rpm), add the metered softener (such as aromatic oil and / or naphthenic oil) to the molten asphalt, and stir at this temperature for 3-10 minutes (e.g., 5 minutes) to allow the softener to fully mix with the asphalt.

[0060] S2.3. Adding Asphalt Modifier: Raise the temperature inside the reactor to the second temperature range of 175-190℃ (preferably 180-185℃), and slowly add the asphalt modifier (such as SBS) while stirring. After the addition is complete, maintain this temperature and stir for 1-3 hours (e.g., 2 hours). If necessary, rubber powder can be added, and the stirring speed can be appropriately increased (e.g., to 250-350 rpm), and stirring can be continued for 0.5-1 hour.

[0061] S2.4. Adding filler: While maintaining the temperature, add the filler (such as talc) with stirring. After the addition is complete, continue stirring for 0.5-1 hour (e.g., 30 minutes) to ensure that the filler is evenly dispersed and free of dry powder particles, thus obtaining a homogeneous component A.

[0062] It should be noted that steps S1 and S2 in this invention are two independent steps. This invention only requires adding the slurry obtained in step S1 to the material including component A obtained in step S2. There is no strict requirement for the order of S1 and S2.

[0063] S3. Foaming reaction and finished product preparation

[0064] S3.1. Introduce isocyanate (component B): Maintain the temperature of component A at 175-190℃ (e.g., 185℃), add component B while stirring (e.g., 200-300 rpm), and stir for 2-20 minutes (e.g., 10 minutes) to allow it to be initially and evenly mixed with the asphalt base.

[0065] S3.2. Initiating Foaming: Add the pre-prepared slurry from step S1 to the above mixture. Then adjust the stirring process, first performing high-speed stirring (e.g., 350-450 rpm for 0.5-2 minutes) to quickly mix the materials and initiate vigorous chemical foaming (reaction of isocyanate with water and carboxyl groups) and thermal decomposition of the foaming agent; subsequently, switch to low-speed stirring (e.g., 10-30 rpm for 3-8 minutes) to stabilize the formed cell structure and prevent bubble coalescence or collapse. During this process, a significant expansion of the material volume can be observed, thereby obtaining the asphalt coating of the present invention.

[0066] The above method allows for precise control of the foaming process, ensuring the production of a uniformly stable asphalt coating with excellent performance. This preparation method offers advantages such as ease of operation, system stability, low energy consumption, and low cost, demonstrating promising prospects for industrial application.

[0067] Asphalt waterproof membrane

[0068] The present invention also provides an asphalt waterproof membrane, which achieves a balance between lightweight and high performance by applying the asphalt coating of the aforementioned invention to a traditional membrane structure.

[0069] The bitumen waterproof membrane of the present invention typically includes at least a structural layer: 1) Substrate layer (base layer) 2) Asphalt coating layer 3) Isolation and protection layer (optional).

[0070] The substrate layer acts as a reinforcing skeleton, supporting the asphalt coating layer and providing the roll material with strength, dimensional stability, and good impregnation properties. The substrate layer can be selected from various base materials commonly used in the art, including but not limited to one or more composite structures of polyester felt (such as long-fiber polyester felt, short-fiber polyester felt), fiberglass felt, fiberglass mesh, polyethylene-polyester composite, and nonwoven fabric. For example, polyester felt or fiberglass felt with a specification of 100 g / m² to 250 g / m² can be selected.

[0071] The asphalt coating layer is formed from the asphalt coating material of this invention. Its thickness can be adjusted according to the waterproofing level requirements, typically ranging from 1.0 mm to 5.0 mm, with different thicknesses corresponding to different products. This layer is the core functional layer, and its internal foam structure not only gives the roll material its lightweight properties but also provides excellent waterproofing, elasticity, and durability.

[0072] The release liner is an optional layer, applied to the surface of the asphalt coating. It is typically the outermost layer when the roll is rolled up, preventing the rolls from sticking together during storage and transportation, and protecting the coating before application. The release liner can be made from polyethylene film (PE film), polypropylene film (PP film), polyethylene terephthalate film (PET film), or release paper (such as silicone paper). Preferably, PE film or PET film is used, with a thickness typically between 10 μm and 50 μm.

[0073] Depending on the specific application requirements, the roll material can be a single-layer bitumen coating structure (with a coating layer only on the substrate layer) or a double-layer bitumen coating structure (with a coating layer on both sides of the substrate). For the double-layer structure, the protective layers on the two surfaces can be the same or different.

[0074] In some specific embodiments of the present invention, after the aforementioned step S3.2, there is also a step S3.3 of discharging and molding: after the material volume no longer increases significantly, stirring and heating are stopped, the foamed asphalt coating material is quickly transferred to the pre-prepared base fabric for scraping and molding, and covered with a release film. After cooling, the lightweight waterproof membrane is obtained.

[0075] The lightweight bitumen waterproof membrane of this invention, due to its excellent waterproof performance, significant lightweight characteristics (facilitating handling and construction), and good durability, can be widely used in various building waterproofing projects. Specific applications include, but are not limited to: Waterproofing for underground projects: such as waterproofing of underground utility tunnels, subway tunnels, basement floors and side walls.

[0076] Waterproofing for industrial and civil building roofs: Suitable for waterproofing layers on all types of flat and sloping roofs. Its lightweight nature effectively reduces roof load.

[0077] Waterproofing for green roofs and green roof slabs: For green roof systems, the waterproofing layer needs to withstand the penetration of plant roots and humid environments over a long period of time.

[0078] Water conservancy and municipal engineering: seepage prevention for projects such as water tanks, canals, and landfills.

[0079] In summary, the asphalt waterproof membrane of this invention, through technological innovation of the core coating material, achieves lightweighting while maintaining excellent waterproof performance, greatly improves construction convenience and efficiency, and expands its application potential in various complex working conditions, meeting the needs of modern building energy conservation, environmental protection, and efficient construction.

[0080] The following embodiments are provided to illustrate the invention in more detail.

[0081] Implementation Plan 1

[0082] A bitumen coating for waterproof membranes, the bitumen coating comprising: A) Asphalt base agent; B) Polyisocyanates or their prepolymers; C) Foaming agent; D) Additives; Component A) Asphalt main agent includes base asphalt, asphalt modifier, softener and filler; The additives include water, surfactants, and catalysts for reacting component B with active hydrogen compounds.

[0083] Implementation Plan 2

[0084] The asphalt coating material according to the first embodiment is characterized in that, The base asphalt is selected from one or more combinations of No. 10 asphalt, No. 30 asphalt, No. 70 asphalt, No. 90 asphalt and No. 200 asphalt.

[0085] Implementation Plan 3

[0086] The asphalt coating material according to the first or second embodiment is characterized in that, The asphalt modifier is selected from one or more of thermoplastic elastomers, polyolefins, and rubber powders.

[0087] Implementation Plan 4

[0088] The asphalt coating material according to the third embodiment is characterized in that... The thermoplastic elastomer is a styrene-butadiene-styrene block copolymer.

[0089] Implementation Plan 5

[0090] The asphalt coating material according to any one of embodiments 1 to 4 is characterized in that, The softener is selected from one or more of aromatic oils and naphthenic oils, or a combination thereof.

[0091] Implementation Plan 6

[0092] The asphalt coating material according to any one of embodiments 1 to 5 is characterized in that, Based on 100 parts by weight of the base asphalt, the asphalt modifier is 15 to 45 parts by weight.

[0093] Implementation Plan No. 7

[0094] The asphalt coating material according to any one of embodiments 1 to 6 is characterized in that, The softener is 2 to 15 parts by weight, based on 100 parts by weight of the base bitumen.

[0095] Implementation Plan No. 8

[0096] The asphalt coating material according to any one of embodiments 1 to 7 is characterized in that, The filler is selected from one or more of inorganic powders or organic modified layered silicates.

[0097] Implementation Plan No. 9

[0098] The asphalt coating material according to the eighth embodiment is characterized in that, The inorganic powder is selected from one or more of talc, calcium stearate, and calcium carbonate.

[0099] Implementation Plan No. 10

[0100] The asphalt coating material according to any one of embodiments 1 to 9 is characterized in that, The amount of filler used shall not exceed 20.0 wt% of the total mass of the asphalt coating.

[0101] Implementation Plan No. 11

[0102] The asphalt coating material according to the tenth embodiment is characterized in that, The filler is used in an amount of 5.0 wt% to 15.0 wt% of the total mass of the asphalt coating.

[0103] Implementation Plan No. 12

[0104] The asphalt coating material according to any of the embodiments 1 to 11 is characterized in that, The NCO content of component B is above 5%.

[0105] Implementation Plan No. 13

[0106] The asphalt coating material according to any one of embodiments 1 to 12 is characterized in that, Component B) is selected from one or more combinations of toluene diisocyanate (TDI), diphenylmethane diisocyanate (MDI), polymethylene polyphenyl isocyanate (PAPI), isophorone diisocyanate (IPDI), hexamethylene diisocyanate (HDI) and their prepolymers.

[0107] Implementation Plan 14

[0108] The asphalt coating material according to any of the embodiments 1 to 13 is characterized in that, Based on 100 parts by weight of component A), component B is 1 to 10 parts by weight.

[0109] Implementation Plan No. 15

[0110] The asphalt coating material according to the 14th embodiment is characterized in that, Based on 100 parts by weight of component A), component B is 2 to 5 parts by weight.

[0111] Implementation Plan No. 16

[0112] The asphalt coating material according to any of the embodiments 1 to 15 is characterized in that, Component C) is a chemical foaming agent, preferably, the thermal decomposition temperature of the chemical foaming agent is between 150°C and 220°C.

[0113] Implementation Plan No. 17

[0114] The asphalt coating material according to any of the embodiments 1 to 16 is characterized in that, The chemical foaming agent is selected from one or more combinations of azo compounds, sulfonyl hydrazine compounds, and nitroso compounds.

[0115] Implementation Plan No. 18

[0116] The asphalt coating material according to any of the embodiments 1 to 17 is characterized in that, Based on 100 parts by weight of component A), component C is 0.1 to 10 parts by weight.

[0117] Implementation Plan No. 19

[0118] The asphalt coating material according to the 18th embodiment is characterized in that, Based on 100 parts by weight of component A), component C is 0.2 to 2 parts by weight.

[0119] Implementation Plan No. 20

[0120] The asphalt coating material according to any of the embodiments 1 to 19 is characterized in that, Component D) also includes one or more of polyols, chelating agents, and foaming agents.

[0121] Implementation Plan No. 21

[0122] The asphalt coating material according to the 20th embodiment is characterized in that, The polyol is selected from one or more combinations of polyether polyols, polyester polyols, polycarbonate polyols, and aliphatic polyols with 2-10 carbon atoms.

[0123] Implementation Plan No. 22

[0124] The asphalt coating material according to embodiment 20 or 21 is characterized in that, The chelating agent is selected from one or more of polycarboxylic acids, hydroxycarboxylic acids, aminopolycarboxylic acids or their salts having 2-10 carbon atoms.

[0125] Implementation Plan No. 23

[0126] The asphalt coating material according to any of embodiments 20 to 22 is characterized in that, The foaming agent is selected from one or more of fatty acid metal salts and metal oxides with 8-20 carbon atoms.

[0127] Implementation Plan No. 24

[0128] The asphalt coating material according to any of the embodiments 1 to 23 is characterized in that, The surfactant is an organosilicon nonionic surfactant and / or an N-vinylamide nonionic surfactant.

[0129] Implementation Plan No. 25

[0130] The asphalt coating material according to any of the embodiments 1 to 24 is characterized in that, The catalyst is selected from one or more of amine catalysts and organometallic catalysts.

[0131] Implementation Plan No. 26

[0132] The asphalt coating material according to the 25th embodiment is characterized in that, The amine catalyst is selected from one or more combinations of triethylenediamine, N,N-dimethylcyclohexylamine, N,N-dimethylethanolamine or bis(2-dimethylaminoethyl) ether.

[0133] Implementation Plan No. 27

[0134] The asphalt coating material according to embodiment 25 or 26 is characterized in that, The organometallic catalyst is selected from organotin compounds.

[0135] Implementation Plan No. 28

[0136] The asphalt coating material according to any of the embodiments 1 to 27 is characterized in that, The amount of component D) is 1.0 to 5.0 wt% of the total mass of the asphalt coating.

[0137] Implementation Plan No. 29

[0138] The asphalt coating material according to the 28th embodiment is characterized in that, The amount of component D) is 2.0 to 4.0 wt% of the total mass of the asphalt coating.

[0139] Implementation Plan No. 30

[0140] A method for preparing an asphalt coating material according to any of the embodiments 1 to 29, characterized by comprising the following steps: Component C) and component D) are mixed to prepare a slurry; The base asphalt is heated, the softener is added, and the mixture is stirred evenly. The temperature is increased, and the asphalt modifier and filler are added sequentially to prepare component A. Add component B) to component A), then add the slurry, and stir until the material volume expands to obtain the asphalt coating.

[0141] Implementation Plan No. 31

[0142] A bituminous waterproof membrane, characterized in that it comprises a substrate layer and a bituminous coating layer formed by the bituminous coating material described in any of the embodiments 1 to 29 or the bituminous coating material prepared by the method described in embodiment 30.

[0143] Implementation Plan No. 32

[0144] The bitumen waterproof membrane according to the 31st embodiment is characterized in that it further includes an isolation and protective layer covering the surface of the bitumen coating layer.

[0145] The present invention will be explained in more detail below with reference to embodiments and comparative examples, and it should be understood that the present invention is not limited to these embodiments.

[0146] Test methods

[0147] Thickness and mass per unit area: Tested in accordance with GB / T328.4 Test methods for building waterproof membranes, Part 4: Thickness and mass per unit area of ​​bitumen waterproof membranes.

[0148] Heat resistance: According to Method A in GB / T 328.11-2007, after maintaining the material at the specified temperature (such as 110℃ or 105℃) for a certain period of time, the material should show no flow or dripping.

[0149] Low-temperature flexibility: Performed according to GB / T 328.14. The bending diameter of 3mm thick roll material is 30mm, and the bending diameter of 4mm and 5mm thick roll material is 50mm. The sample is bent 180° under the specified low-temperature conditions and held for a certain period of time. There should be no cracks after the test.

[0150] Impermeability: Tested according to Method E in GB / T 328.10-2007, using a 7-well plate with the upper surface facing water. Maintain a water pressure of 0.3 MPa for 30 minutes; no leakage should occur on the back of the sample.

[0151] Example 1

[0152] The following raw materials were mixed to prepare component D: 20 parts of commercially available polyol CHK-340A, 5 parts of water, 3 parts of citric acid, 12 parts of zinc oxide, 80 parts of commercially available X220 polyether-modified silicone oil, 0.5 parts of commercially available polyvinylpyrrolidone PVP K30, and 0.3 parts of DABCO BL-11 catalyst were mixed thoroughly to form a homogeneous mixture. Subsequently, 10% by weight of commercially available azodicarbonamide (i.e., component C) was added to the mixture, and it was stirred thoroughly again to obtain a slurry for later use.

[0153] Weigh 500 g of commercially available SK 90 base asphalt, heat to 150 ℃, then add 60 g of commercially available SA-1500 aromatic oil, and stir at 200 r / min for 3 min. Raise the system to 185 ℃, add 85 g of YH-898 type SBS produced by Baling Petrochemical, and continue stirring at 200 r / min for 2 h. Then, add 100 g of commercially available 80 mesh rubber powder, and stir at 250 r / min for 30 min. Finally, add 120 g of commercially available 200 mesh talc powder, and continue stirring for 30 min to obtain component A.

[0154] At 185 °C, add 35 g of commercially available Lupronat® MX128 / 1 (component B) to component A, stir for 10 min, then add 35 g of the slurry prepared above. Stir at 400 r / min for 0.5 min, then at 20 r / min for 5 min. After the mixture expands in volume, pour it onto the surface of the base fabric and quickly smooth it. Then cover with a PE film to form a waterproof roll.

[0155] Example 2

[0156] Component D was prepared by mixing the following raw materials: 50 parts of commercially available polyol Lupronol® 2048, 3 parts of water, 1.9 parts of citric acid, 12 parts of zinc oxide, 50 parts of commercially available VORASURF™ DC 193 siloxane surfactant, and 0.3 parts of JEFFCAT ZF-10 catalyst were mixed thoroughly to form a homogeneous mixture. Then, 10% by weight of commercially available azodicarbonamide (component C) was added to this mixture, and the mixture was stirred thoroughly to obtain a slurry for later use.

[0157] Commercially available Donghai No. 70 asphalt and Panjin Beili No. 200 asphalt were heated to 150 ℃ and mixed at a mass ratio of 85:15 to prepare a base asphalt system, totaling 500 g. 45 g of commercially available SA-1500 aromatic oil was added to this base asphalt, and the mixture was stirred at 200 r / min for 3 min. The system was then heated to 185 ℃, and 50 g of YH-791 type SBS produced by Baling Petrochemical and 25 g of 1301 type SBS produced by Yanshan Petrochemical were added, with stirring continuing at 200 r / min for 2 h. Subsequently, 90 g of commercially available 100 mesh rubber powder was added sequentially, and the mixture was stirred at 250 r / min for 30 min. Then, 100 g of commercially available 200 mesh talc powder was added, and stirring continued for 30 min to obtain component A.

[0158] At 185 °C, add 25 g of commercially available isocyanate Lupronat® MX 118 / 1 (component B) to component A, stir for 10 min, then add 25 g of the slurry prepared above. Stir at 400 r / min for 0.5 min, then at 20 r / min for 5 min to allow the material to fully expand. Spread the expanded material evenly onto the base fabric and quickly smooth it out, then cover with a PE film to form a waterproof roll.

[0159] Example 3

[0160] Component D was prepared by mixing the following raw materials: 50 parts of commercially available polyol CHE5602, 3 parts of water, 1.9 parts of citric acid, 12 parts of zinc oxide, 50 parts of commercially available VORASURF™ DC 193 siloxane surfactant, 0.3 parts of commercially available polyvinylpyrrolidone PVP K15, and 0.3 parts of triethylenediamine catalyst were weighed and stirred until homogeneous to obtain a mixed system. Subsequently, 10% by weight of commercially available azodicarbonamide (component C) was added to the mixed system, and stirring was continued until homogeneous to obtain a slurry for later use.

[0161] Commercially available No. 10 asphalt and Donghai No. 70 asphalt were heated to 150 °C and mixed at a mass ratio of 85:15 to prepare a base asphalt with a total volume of 500 g. Then, 60 g of commercially available SA-1500 aromatic oil was added to the base asphalt, and the mixture was stirred at 200 r / min for 3 min. The system was then heated to 185 °C, and 50 g of YH-791 type SBS produced by Baling Petrochemical and 25 g of 1301 type SBS produced by Yanshan Petrochemical were added sequentially, maintaining stirring at 200 r / min for 2 h. Next, 90 g of commercially available 100 mesh rubber powder was added, and the mixture was stirred at 250 r / min for 30 min. Finally, 100 g of commercially available 325 mesh talc powder was added, and the mixture was stirred for another 30 min to obtain component A.

[0162] At 185 °C, add 25 g of commercially available isocyanate Lupronat® MP 101 / 1 (component B) to component A, stir for 10 min, and then add 25 g of the slurry prepared above. Then stir at 400 r / min for 0.5 min, followed by 20 r / min for 5 min to allow the system to expand in volume. Finally, quickly pour the expanded material onto the surface of the base fabric, smooth it, and cover it with a PE film to form a waterproof roll.

[0163] Example 4

[0164] Component D was prepared by mixing the following raw materials: 20 parts of commercially available polyol Lupronol® 2048, 5 parts of water, 1.2 parts of zinc oxide, 80 parts of commercially available polyether-modified heptamethyltrisiloxane, 0.3 parts of commercially available polyvinylpyrrolidone (PVP K15), and 0.3 parts of DABCO BL-11 catalyst were weighed and stirred until homogeneous to form a mixed system. Subsequently, 10% by weight of commercially available N,N'-dinitrospentamethylenetetramine (component C) was added to the mixed system, and stirring was continued until homogeneous to obtain a slurry for later use.

[0165] Weigh 500 g of commercially available SK 90 base asphalt and heat it to 150 ℃. Add 60 g of commercially available SA-1500 aromatic oil and stir at 200 r / min for 3 min. Then, raise the temperature of the system to 185 ℃ and add 85 g of YH-898 type SBS produced by Baling Petrochemical, and continue stirring at 200 r / min for 2 h. After that, add 100 g of commercially available 80 mesh rubber powder and stir at 250 r / min for 30 min. Then add 120 g of commercially available 270 mesh talc powder and continue stirring for 30 min to obtain component A.

[0166] At 185 °C, 26 g of commercially available isocyanate Lupronat® MM 103 (component B) was added to component A and stirred for 10 min. Then, 26 g of the slurry prepared above was added. The mixture was then stirred at 400 r / min for 0.5 min, followed by 20 r / min for 5 min, to allow the system to expand in volume. Finally, the expanded material was evenly poured onto the surface of the base fabric and quickly smoothed, then covered with a PE film to form a waterproof roll.

[0167] Example 5

[0168] Component D was prepared by mixing the following raw materials: 20 parts by weight of a mixture of commercially available polyols CHE5602 and CHE628 (mass ratio 8:1), 5 parts by weight of water, 1.2 parts by weight of zinc stearate, 80 parts by weight of commercially available VORASURF™ DC 193 siloxane surfactant, 2.5 parts by weight of commercially available polyvinylpyrrolidone PVP K30, and 0.3 parts by weight of DABCO BL-11 catalyst were weighed and thoroughly mixed under stirring to form a homogeneous system. Then, 10% by weight of commercially available N,N'-dinitrospentamethylenetetramine (component C) was added to the system, and stirring was continued until completely homogeneous to obtain a slurry for later use.

[0169] Commercially available Donghai No. 70 asphalt and Panjin Beili No. 200 asphalt were heated to 150 ℃ and mixed at a mass ratio of 80:20 to prepare a base asphalt with a total volume of 500 g. Under stirring conditions, 60 g of commercially available SA-1500 aromatic oil was added, and the mixture was stirred at 200 r / min for 3 min, then the temperature was further increased to 185 ℃. At this temperature, 85 g of YH-898 type SBS produced by Baling Petrochemical was added, and the mixture was stirred at 200 r / min for 2 h. Subsequently, 100 g of commercially available 80 mesh rubber powder was added, and the mixture was stirred at 250 r / min for 30 min. Then, 120 g of commercially available 200 mesh talc powder was added, and the mixture was stirred for another 30 min to obtain component A.

[0170] At 185 °C, 26 g of commercially available isocyanate Lupronat® MP101 / 2 (component B) was added to component A and stirred for 10 min, followed by the addition of 26 g of the slurry prepared above. The mixture was then stirred at 400 r / min for 0.5 min, and then at 20 r / min for 5 min to allow the system to expand in volume. The expanded material was then evenly poured onto the surface of the base fabric and quickly smoothed, followed by covering with a PE film to form a waterproof roll.

[0171] Example 6

[0172] Component D was prepared by mixing the following raw materials: 20 parts of a mixture of commercially available polyols CHE5602 and CHE628 (mass ratio 8:1), 5 parts of water, 3 parts of citric acid, 12 parts of zinc oxide, 80 parts of commercially available X220 polyether-modified silicone oil, 1.0 part of commercially available polyvinylpyrrolidone (PVP K30), and 0.3 parts of DABCO BL-11 catalyst were weighed and thoroughly mixed under stirring to form a homogeneous system. Then, 10% by mass of commercially available azodicarbonamide (component C) was added to this system, and stirring was continued until completely homogeneous to obtain a slurry for later use.

[0173] Weigh 500 g of commercially available SK 90 base asphalt and heat it to 150 ℃. Add 60 g of commercially available SA-1500 aromatic oil and stir at 200 r / min for 3 min. After heating the system to 185 ℃, add 85 g of YH-898 type SBS produced by Baling Petrochemical and maintain stirring at 200 r / min for 2 h. Then add 100 g of commercially available 120 mesh rubber powder and stir at 250 r / min for 30 min. Finally, add 120 g of commercially available 400 mesh talc powder and continue stirring for 30 min to obtain component A.

[0174] At 185 °C, 35 g of commercially available isocyanate Lupronat® MX128 / 1 (component B) was added to component A above, and stirred for 10 min. Then, 35 g of the previously prepared slurry was added, and the mixture was stirred at 400 r / min for 0.5 min, followed by stirring at 20 r / min for 5 min, causing the system to expand in volume. Subsequently, the pre-impregnated polyester base fabric was immersed in the expanded material, calendered to a fixed thickness, and covered with a PE release film to obtain the waterproof roll material.

[0175] Comparative Example 1

[0176] Weigh 500 g of commercially available SK 90 base bitumen and heat it to 150 ℃. Add 60 g of commercially available SA-1500 aromatic oil and stir at 200 r / min for 3 min. Then, raise the temperature of the system to 185 ℃, add 85 g of YH-898 type SBS produced by Baling Petrochemical, and continue stirring at 200 r / min for 2 h. After that, add 100 g of commercially available 80 mesh rubber powder and stir at 250 r / min for 30 min. Then add 120 g of commercially available 200 mesh talc powder and continue stirring for 30 min to obtain the roll coating material.

[0177] At 185 ℃, the above coating material is evenly poured onto the surface of the base fabric and quickly smoothed. Then, a PE film is covered, and after cooling and setting, a waterproof membrane is obtained.

[0178] Comparative Example 2

[0179] Commercially available Donghai No. 70 asphalt and Panjin Beili No. 200 asphalt were heated to 150 ℃ and mixed at a mass ratio of 85:15 to prepare a base asphalt with a total volume of 500 g. Then, 45 g of commercially available SA-1500 aromatic oil was added to the base asphalt, and the mixture was stirred at 200 r / min for 3 min. After heating the system to 185 ℃, 50 g of YH-791 type SBS produced by Baling Petrochemical and 25 g of 1301 type SBS produced by Yanshan Petrochemical were added, and the mixture was stirred at 200 r / min for 2 h. After the SBS was completely dispersed, 90 g of commercially available 100 mesh rubber powder was added, and the mixture was stirred at 250 r / min for 30 min; subsequently, 100 g of commercially available 200 mesh talc powder was added, and the mixture was stirred for another 30 min to obtain the roll coating material.

[0180] At 185 ℃, the above coating material is evenly poured onto the surface of the base fabric and quickly smoothed, then covered with PE film, and after cooling and shaping, a waterproof roll is formed.

[0181] Comparative Example 3

[0182] Weigh 500 g of commercially available SK 90 base bitumen and heat it to 150 ℃. Add 60 g of commercially available SA-1500 aromatic oil and stir at 200 r / min for 3 min. Then, heat the system to 185 ℃, add 85 g of YH-898 SBS produced by Baling Petrochemical, and continue stirring at 200 r / min for 2 h. After that, add 100 g of commercially available 80 mesh rubber powder to the system and stir at 250 r / min for 30 min; then add 120 g of commercially available 200 mesh talc powder and continue stirring for 30 min to obtain the roll coating material.

[0183] Add 10% by weight of commercially available azodicarbonamide (component C) to the coating material, stir at 400 r / min for 0.5 min, then stir at 20 r / min for 5 min. Then, pour the mixed material evenly onto the surface of the base fabric and quickly smooth it out, cover it with a PE film, and after cooling and setting, form a waterproof roll.

[0184] Comparative Example 4

[0185] Weigh 500 g of commercially available SK 90 base bitumen and heat it to 150 ℃. Add 60 g of commercially available SA-1500 aromatic oil and stir at 200 r / min for 3 min. Then, heat the system to 185 ℃ and add 85 g of YH-898 type SBS produced by Baling Petrochemical, and continue stirring at 200 r / min for 2 h. Next, add 100 g of commercially available 80 mesh rubber powder to the system and stir at 250 r / min for 30 min; then add 120 g of commercially available 200 mesh talc powder and continue stirring for 30 min to obtain the roll coating material.

[0186] At 185 °C, 26 g of commercially available isocyanate Lupronat® MP101 / 1 (component B) was added to the above coating material. The mixture was stirred at 400 r / min for 0.5 min, and then at 20 r / min for 5 min. The mixture was then poured evenly onto the surface of the base fabric and quickly smoothed. A PE film was then applied, and the mixture was cooled and set to form a waterproof roll.

[0187] Comparative Example 5

[0188] Weigh 500 g of commercially available SK 90 base bitumen and heat it to 150 ℃. Add 60 g of commercially available SA-1500 aromatic oil and stir at 200 r / min for 3 min. After heating the system to 185 ℃, add 85 g of YH-898 type SBS produced by Baling Petrochemical and maintain stirring at 200 r / min for 2 h. Then add 100 g of commercially available 120 mesh rubber powder and stir at 250 r / min for 30 min. Finally, add 120 g of commercially available 400 mesh talc powder and continue stirring for 30 min to obtain the roll coating material.

[0189] At 185 ℃, the pre-impregnated polyester base fabric is immersed in the expanded material, and after calendering and thickness determination, it is covered with a PE release film to obtain a waterproof membrane.

[0190] The actual test results of the waterproof membranes prepared in the examples and comparative examples are shown in Table 1. The waterproof membrane prepared in the examples has a significantly lower density and significantly higher heat resistance than the comparative example. Meanwhile, the low-temperature flexibility (-25℃) and impermeability (0.3MPa, 30min) of the waterproof membranes in Examples 1-6 all meet the requirements of the current national standard (GB18242-2025).

[0191] Table 1

Claims

1. A bitumen coating for waterproof membranes, the bitumen coating comprising: A) Asphalt base agent; B) Polyisocyanates or their prepolymers; C) Foaming agent; D) Additives; Component A) Asphalt main agent includes base asphalt, asphalt modifier, softener and filler; The additives include water, surfactants, and catalysts for reacting component B with active hydrogen compounds.

2. The asphalt coating material according to claim 1, characterized in that, The base asphalt is selected from one or more combinations of No. 10 asphalt, No. 30 asphalt, No. 70 asphalt, No. 90 asphalt and No. 200 asphalt.

3. The asphalt coating material according to claim 1 or 2, characterized in that, The asphalt modifier is selected from one or more combinations of thermoplastic elastomers, polyolefins, and rubber powder; preferably, the thermoplastic elastomer is a styrene-butadiene-styrene block copolymer.

4. The asphalt coating material according to any one of claims 1-3, characterized in that, The softener is selected from one or more of aromatic oils and naphthenic oils, or a combination thereof.

5. The asphalt coating material according to any one of claims 1-4, characterized in that, Based on 100 parts by weight of the base asphalt, the asphalt modifier is 15 to 45 parts by weight.

6. The asphalt coating material according to any one of claims 1-5, characterized in that, The softener is 2 to 15 parts per 100 parts by weight of the base bitumen.

7. The asphalt coating material according to any one of claims 1-6, characterized in that, The filler is selected from one or more of inorganic powders or organic modified layered silicates. Preferably, the inorganic powder is selected from one or more of talc, calcium stearate, and calcium carbonate.

8. The asphalt coating material according to any one of claims 1-7, characterized in that, The amount of filler used does not exceed 20.0 wt% of the total mass of the asphalt coating material. Preferably, the amount of filler used accounts for 5.0 wt% to 15.0 wt% of the total mass of the asphalt coating material.

9. The asphalt coating material according to any one of claims 1-8, characterized in that, The NCO content of component B is above 5%.

10. The asphalt coating material according to any one of claims 1-9, characterized in that, Component B) is selected from one or more combinations of toluene diisocyanate (TDI), diphenylmethane diisocyanate (MDI), polymethylene polyphenyl isocyanate (PAPI), isophorone diisocyanate (IPDI), hexamethylene diisocyanate (HDI) and their prepolymers.

11. The asphalt coating material according to any one of claims 1-10, characterized in that, Based on 100 parts by weight of component A), component B) is 1 to 10 parts, preferably 2 to 5 parts.

12. The asphalt coating material according to any one of claims 1-11, characterized in that, Component C) is a chemical foaming agent, preferably, the thermal decomposition temperature of the chemical foaming agent is between 150°C and 220°C.

13. The asphalt coating material according to claim 12, characterized in that, The chemical foaming agent is selected from one or more combinations of azo compounds, sulfonyl hydrazine compounds, and nitroso compounds.

14. The asphalt coating material according to any one of claims 1-13, characterized in that, Based on 100 parts by weight of component A), component C) is 0.1 to 10 parts, preferably 0.2 to 2 parts.

15. The asphalt coating material according to any one of claims 1-14, characterized in that, Component D) further includes one or more of polyols, chelating agents, and foaming agents. Preferably, the polyol is selected from one or more combinations of polyether polyols, polyester polyols, polycarbonate polyols, and aliphatic polyols with 2-10 carbon atoms; the chelating agent is selected from one or more of polycarboxylic acids, hydroxycarboxylic acids, amino polycarboxylic acids, or their salts with 2-10 carbon atoms; and the foaming agent is selected from one or more of fatty acid metal salts and metal oxides with 8-20 carbon atoms.

16. The asphalt coating material according to any one of claims 1-15, characterized in that, The surfactant is an organosilicon nonionic surfactant and / or an N-vinylamide nonionic surfactant.

17. The asphalt coating material according to any one of claims 1-16, characterized in that, The catalyst is selected from one or more combinations of amine catalysts and organometallic catalysts. Preferably, the amine catalyst is selected from one or more combinations of triethylenediamine, N,N-dimethylcyclohexylamine, N,N-dimethylethanolamine or bis(2-dimethylaminoethyl) ether, and the organometallic catalyst is selected from organotin compounds.

18. The asphalt coating material according to any one of claims 1-17, characterized in that, The amount of component D) is 1.0 to 5.0 wt% of the total mass of the asphalt coating, preferably 2.0 to 4.0 wt%.

19. A method for preparing the asphalt coating material according to any one of claims 1-18, characterized in that, Includes the following steps: Component C) and component D) are mixed to prepare a slurry; The base asphalt is heated, the softener is added, and the mixture is stirred until homogeneous. The temperature is then increased, and the asphalt modifier and filler are added sequentially to prepare component A. Add component B) to component A), then add the slurry, and stir until the material volume expands to obtain the asphalt coating.

20. A bituminous waterproof membrane, characterized in that, The membrane includes a substrate layer and an asphalt coating layer formed by the asphalt coating material according to any one of claims 1-18 or the asphalt coating material prepared by the method of claim 19. Preferably, the asphalt waterproof membrane further includes an isolation protective layer covering the surface of the asphalt coating layer.

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