Water-based asphalt coating, preparation method thereof and composite waterproof structure

Abstract

The invention provides a water-based asphalt coating, a preparation method thereof and a composite waterproof structure, and belongs to the technical field of modified asphalt. The water-based asphalt coating comprises a mixture of a component A and a component B. The component A is maleic anhydride modified asphalt which is a blend of matrix asphalt and maleic anhydride modified resin, and the mass of the maleic anhydride modified resin is 3-10% of that of the matrix asphalt; the component B is a self-emulsifying epoxy modified acrylic emulsion which is an emulsion formed by an emulsifier grafted acrylic polymer and epoxy resin. The component B has the self-emulsifying characteristic, so that the component B can be dispersed in water, epoxy groups in the component B can chemically react with anhydride groups in the component A, a stable cross-linked structure is formed in the asphalt coating, good water resistance is provided after drying, and the formed water-based asphalt coating has better performance.

Description

Technical Field

[0001] The invention relates to the technical field of modified asphalt, and in particular to a water-based asphalt coating and a preparation method thereof, and a composite waterproof structure. Background Art

[0002] With the increasing demand for waterproofing in construction and municipal engineering, the composite waterproofing structure of "coating + coiled material" has a wider application space. Asphalt waterproofing coating has good compatibility with asphalt coiled material and can be used in a large number of composite waterproofing systems composed of asphalt coiled material.

[0003] Traditional water-based asphalt coatings use rubber latex or SBS (styrene-butadiene-styrene) to modify asphalt, but the waterproof effect is poor, and there are problems such as poor water resistance and poor adhesion to the base layer. Summary of the invention

[0004] In view of this, in order to at least partially solve at least one of the above-mentioned technical problems, the present invention provides a water-based asphalt coating and a preparation method thereof, and a composite waterproof structure.

[0005] According to an embodiment of one aspect of the present invention, a water-based asphalt coating is provided, comprising: a mixture of component A and component B, wherein component A: maleic anhydride modified asphalt, which is a blend of base asphalt and maleic anhydride modified resin, wherein the mass of the maleic anhydride modified resin is 3-10% of the base asphalt; component B: self-emulsifying epoxy-modified acrylic emulsion, which is an emulsion formed by an acrylic polymer grafted with an emulsifier and an epoxy resin; the maleic anhydride modified resin includes maleic anhydride modified SBS resin.

[0006] According to an embodiment of the present invention, the water-based asphalt coating further includes: Component C: graphene-modified glass fiber.

[0007] According to an embodiment of the present invention, the mass ratio of component A to component B is (8-15):10.

[0008] According to an embodiment of the present invention, the mass of component C is 1-8% of the water-based asphalt coating.

[0009] According to an embodiment of another aspect of the present invention, a method for preparing a water-based asphalt coating as described above is provided, comprising: performing a first mixing and heating of a base asphalt and a maleic anhydride-modified resin to obtain a component A; respectively adding an acrylic monomer and an emulsifier to water, and performing a second mixing and heating with an epoxy solution under the action of an initiator to obtain a component B; mixing components A and B, heating and dispersing them, to obtain a water-based asphalt coating.

[0010] According to an embodiment of the present invention, the preparation method further comprises: mixing and stirring the water-based asphalt coating with the graphene-modified glass fiber to obtain a finished water-based asphalt coating.

[0011] According to an embodiment of the present invention, the temperature of the first mixed heating is 155-175°C, and the time is 1.5-2.5 hours; the temperature of the second mixed heating is 75-85°C, and the time is 1.5-2.5 hours; the initiator includes at least one of potassium persulfate and ammonium persulfate; the emulsifier includes at least one of allyloxy nonylphenol polyoxyethylene (10) ether ammonium sulfate, allyloxy nonylphenol polyoxyethylene ether, and allyloxy hydroxypropane sulfonate sodium; the acrylic monomer includes at least one of butyl acrylate and methyl methacrylate; the epoxy solution is prepared by dissolving an epoxy resin in an organic solvent; the epoxy resin includes at least one of E-12 epoxy resin, E-20 epoxy resin, and E-44 epoxy resin.

[0012] According to an embodiment of the present invention, based on 100 parts by weight of the total of acrylic monomer, emulsifier and water, the mass fraction of acrylic monomer is 40-60 parts, the mass fraction of emulsifier is 0.5-2 parts, and the mass fraction of epoxy solution is 5-10 parts.

[0013] According to an embodiment of the present invention, after the second mixing and heating, the method further comprises: adding alkaline solution to adjust the pH value to 9-11.

[0014] According to an embodiment of the present invention, the heating dispersion comprises adding maleic anhydride modified asphalt at 155-175° C. into a self-emulsifying epoxy modified acrylic emulsion at a temperature of 75-85° C., with a dispersion time of 14-16 minutes and a dispersion speed of 5000-8000 rpm.

[0015] According to an embodiment of the present invention, graphene-modified glass fiber is prepared by the following steps: graphene and a silane coupling agent are dispersed and mixed in hydrogen peroxide and then added to glass fiber, so that the graphene is precipitated and adsorbed on the surface of the glass fiber to obtain graphene-modified glass fiber; the silane coupling agent includes at least one of a vinyl coupling agent, an amino coupling agent, and an epoxy coupling agent.

[0016] According to an embodiment of still another aspect of the present invention, there is provided a composite waterproof structure, comprising an asphalt roll material and a waterproof coating formed by the above-mentioned water-based asphalt coating.

[0017] According to an embodiment of the present invention, a cross-linked network is formed in the coated film through the chemical reaction of the anhydride group in component A and the epoxy group in component B, thereby solving the problems of high water absorption and poor water resistance of conventional water-based asphalt coatings. The water-based asphalt coating of the present invention has the characteristics of low water absorption, good water resistance and strong waterproofness after curing and molding, and compared with traditional products, the water-based asphalt coating of the present invention has better bonding effect and mechanical properties.

[0018] Compared with the oily asphalt coating in the related art, the water-based asphalt coating of the present invention has a lower volatile organic compound content and is more environmentally friendly when used. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and other objects, features and advantages of the present invention will become more apparent through the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:

[0020] Figure 1 A flow chart of a method for preparing a water-based asphalt coating is shown. DETAILED DESCRIPTION

[0021] Below, embodiments of the present invention will be described with reference to the accompanying drawings. However, it should be understood that these descriptions are exemplary only and are not intended to limit the scope of the present invention. In the following detailed description, for ease of explanation, many specific details are set forth to provide a comprehensive understanding of embodiments of the present invention. However, it is apparent that one or more embodiments may also be implemented without these specific details. In addition, in the following description, descriptions of known structures and technologies are omitted to avoid unnecessary confusion of concepts of the present invention.

[0022] The terms used herein are only for describing specific embodiments and are not intended to limit the present invention. The term "comprising" used herein indicates the existence of features, steps, operations, but does not exclude the existence or addition of one or more other features.

[0023] In the case of using expressions such as "at least one of A, B, and C, etc.", it should generally be interpreted in accordance with the meaning of the expression generally understood by those skilled in the art (for example, "a system having at least one of A, B, and C" should include but is not limited to a system having A alone, B alone, C alone, A and B, A and C, B and C, and / or A, B, C, etc.). In the case of using expressions such as "at least one of A, B, or C, etc.", it should generally be interpreted in accordance with the meaning of the expression generally understood by those skilled in the art (for example, "a system having at least one of A, B, or C" should include but is not limited to a system having A alone, B alone, C alone, A and B, A and C, B and C, and / or A, B, C, etc.).

[0024] Traditional water-based asphalt coatings have problems such as poor waterproofing effect, poor water resistance, and weak bonding ability. In the process of realizing the concept of the present invention, it was found that by using acrylic emulsion as a modifier and physically dispersing it into the asphalt emulsion, a new stable heterogeneous system can be constructed, which can change the rheological properties, viscoelasticity and ductility of asphalt, and improve the bonding strength and impermeability of the product. However, since acrylic emulsion contains more hydrophilic groups such as carboxyl and ester groups, the water resistance of the waterproof coating is reduced after curing and forming, and it is easy to have problems such as swelling, bubbles, and shedding.

[0025] In order to solve the above problems, the inventors used epoxy resin to modify acrylic acid in the hope of reducing the content of hydrophilic groups in acrylic emulsion. However, the compatibility between epoxy resin and asphalt is poor, resulting in the separation of epoxy-modified acrylic emulsion in water-based asphalt coating, poor storage stability, and a relatively general modification effect. At the same time, due to the addition of a relatively large amount of emulsifier (with hydrophilic groups) during the asphalt emulsification process, the mechanical properties and water resistance of the prepared water-based asphalt coating are relatively low.

[0026] In view of this, the present invention uses maleic anhydride modified asphalt as component A and self-emulsifying epoxy modified acrylic emulsion as component B, and utilizes the chemical reaction between the anhydride group and the epoxy group to form a cross-linked structure inside the asphalt coating, thereby improving the water resistance of the water-based asphalt coating, reducing the water absorption rate, and improving the bonding properties and mechanical properties of the water-based asphalt coating.

[0027] Specifically, according to an embodiment of one aspect of the present invention, a water-based asphalt coating is provided, comprising: Component A: maleic anhydride-modified asphalt, which is a blend of base asphalt and maleic anhydride-modified resin, the mass of the maleic anhydride-modified resin being 3-10% of the base asphalt; Component B: self-emulsifying epoxy-modified acrylic emulsion, which is an emulsion formed by an emulsifier-grafted acrylic polymer and an epoxy resin, the maleic anhydride-modified resin comprising a maleic anhydride-modified SBS resin.

[0028] According to the embodiments of the present invention, maleic anhydride modified asphalt can be understood as the introduction of maleic anhydride groups to chemically modify asphalt. The modification of maleic anhydride can enhance the compatibility of asphalt with component B and reduce the occurrence of segregation. In addition, the maleic anhydride groups can interact with the epoxy groups in component B during the curing process to form a cross-linked network structure. Such a cross-linked network structure helps to improve the compactness of the coating (formed after the coating dries), reduces the possibility of water penetration, and thus improves the water resistance of the water-based asphalt coating. In addition, the modification of asphalt by maleic anhydride can also improve the thermal stability and mechanical properties of asphalt, making the coating more durable.

[0029] Furthermore, the self-emulsifying epoxy-modified acrylic emulsion combines the characteristics of epoxy resin and acrylate. Epoxy resin has good adhesion, and acrylate gives water-based asphalt coating better flexibility and weather resistance. When component A and component B are combined, the formed water-based asphalt coating can quickly form a film after construction, and further cross-link and harden during light curing or natural drying to form a dense protective layer.

[0030] It should be noted that the cross-linked network structure formed between component A and component B is not easily destroyed by hydrolysis, and can maintain stable performance even in a humid environment for a long time. The coating film formed after curing is not only thick and uniform, but also has almost no obvious defects or holes, which greatly limits the water penetration path. This enables the water-based asphalt coating to achieve excellent water resistance and extremely low water absorption, extending its service life.

[0031] The mass of the maleic anhydride modified resin is 3-10% of the base asphalt, for example, 3%, 5%, 7%, 9% or 10%. Adjusting the ratio of the two within the above range helps to fully mix the base asphalt and the maleic anhydride modified SBS resin, so that the maleic anhydride and the polar groups in the base asphalt form an interaction, improve the compatibility between the base asphalt and the SBS resin, and at the same time, the performance of the base asphalt will not be affected due to excessive addition.

[0032] According to an embodiment of the present invention, the mass ratio of component A to component B is (8-15):10, for example, it can be 4:5, 1:1, 3:2, etc. Adjusting the mass ratio of the two within the above range helps to ensure that there are sufficient reaction sites between the maleic anhydride group and the epoxy group, so that a cross-linked network structure can be fully formed. If component A is used too much, unreacted maleic anhydride may remain, affecting the performance of the final water-based asphalt coating; if component B is used too much, unnecessary side reactions will be caused due to excessive epoxy groups. In addition, the above ratio helps to maintain the stability of the emulsion system and prevent the occurrence of stratification or precipitation.

[0033] According to an embodiment of the present invention, the water-based asphalt coating further includes: Component C: graphene-modified glass fiber. Graphene-modified glass fiber can be understood as a composite material prepared by introducing graphene into glass fiber. The addition of component C makes the surface of the glass fiber rougher and increases friction, which can improve the tensile strength and elongation at break of the coating without sacrificing the flexibility of the water-based asphalt coating, thereby improving the compatibility between the water-based asphalt coating and concrete, and overcoming the problem that conventional glass fiber is easy to slip in the asphalt coating and has poor performance improvement effect. The addition of component C improves the anti-slip performance of the coating and the bonding performance with the concrete base.

[0034] According to an embodiment of the present invention, the mass of component C is 1-8% of the water-based asphalt coating, for example, it can be 1%, 2%, 3%, 4%, 5%, 6%, 7% or 8%, etc. Adjusting the added mass of component C within the above range can significantly enhance the mechanical properties of the coating film while maintaining good flexibility of the coating film, so that it has good ductility and adhesion. If the mass of component C added is too small, the effect of enhancing the mechanical strength of the water-based asphalt coating is limited; if the mass of component C added is too large, the coating film formed after curing will be too rigid and lose the necessary flexibility, affecting the application effect of the coating film on curved or telescopic surfaces.

[0035] According to another embodiment of the present invention, there is provided a method for preparing the water-based asphalt coating as described above. Figure 1 A flow chart of a method for preparing a water-based asphalt coating is shown, such as Figure 1 As shown, the method includes operations S101 to S103.

[0036] In operation S101, the base asphalt and the maleic anhydride modified resin are first mixed and heated to obtain the A component.

[0037] Directly mixing SBS (styrene-butadiene-styrene) resin with base asphalt will result in poor compatibility between the two. Modifying the SBS resin with maleic anhydride can improve the compatibility between the base asphalt and the SBS resin. This is because the maleic anhydride group can interact with the polar components in the base asphalt, making the two more tightly combined. Further reaction with component B helps to improve the mechanical properties and durability of water-based asphalt coatings.

[0038] In operation S102, acrylic monomer and emulsifier are added to water respectively, and mixed and heated with epoxy solution under the action of initiator to obtain component B.

[0039] The emulsifier is preferably a polymeric emulsifier, which can be grafted with acrylic monomers and, under the action of an initiator, can generate an epoxy-modified acrylic emulsion with self-emulsifying properties. The emulsifier has the characteristics of being hydrophilic at one end and lipophilic at the other end. After forming self-emulsification, the water-based asphalt coating itself has an emulsifier effect, and can make non-hydrophilic oily materials evenly dispersed in the water matrix. Due to the formation of a self-emulsifying component B, there is no need to add an additional emulsifier, thereby reducing the introduction of hydrophilic groups, so that the prepared water-based asphalt coating has good water resistance and mechanical properties.

[0040] In operation S103, component A and component B are mixed and heated and dispersed to obtain a water-based asphalt coating.

[0041] Dispersion by heating helps to make the mixing between component A and component B more uniform, and the interaction between maleic anhydride groups and epoxy groups is more sufficient, which helps to form a dense cross-linked network structure, improve the water resistance of the cured coating film, and improve the mechanical properties of the water-based asphalt coating.

[0042] According to the embodiment of the present invention, through S101 to S103, the maleic anhydride group and the epoxy group interact to generate ester bonds, forming a dense cross-linked network structure in the water-based asphalt coating, thereby improving the water resistance of the water-based asphalt coating and solving the problems of high water absorption and poor water resistance of conventional water-based asphalt coatings. In addition, the emulsifier is grafted on the B component to emulsify the water-based asphalt coating, which helps to be dispersed and suspended in water. No additional emulsifier is required during the preparation process, further improving the water resistance of the water-based asphalt coating.

[0043] According to an embodiment of the present invention, the preparation method may further include: mixing and stirring the water-based asphalt coating with the graphene-modified glass fiber to obtain a finished water-based asphalt coating.

[0044] According to an embodiment of the present invention, by adding graphene to glass fiber, in-situ sedimentation and adsorption of graphene can be achieved on the surface of glass fiber, so that the finished water-based asphalt coating has good compatibility with substrates such as concrete, thereby overcoming the problem that conventional glass fiber is easy to slip in water-based asphalt coating and has a poor effect on improving the performance of water-based asphalt coating. The graphene modification of the present invention can improve the anti-slip performance of the coating film, improve the bonding performance with substrates such as concrete, and increase the service life of the coating film.

[0045] Preferably, the length of the glass fiber can be less than 1 mm. The reason is that if the glass fiber is too long, it will lead to agglomeration of the glass fiber, poor dispersion effect, and limited improvement on the mechanical properties and anti-slip effect of the water-based asphalt coating.

[0046] According to an embodiment of the present invention, the temperature of the first mixed heating is 155-175°C, for example, 155°C, 160°C, 165°C, 170°C or 175°C, and the time is 1.5-2.5h, for example, 1.5h, 2h or 2.5h, preferably 2h. Adjusting the temperature and time of the first mixed heating within the above range helps to fully mix the base asphalt and the maleic anhydride modified resin, so that the maleic anhydride and the polar groups in the base asphalt form an interaction, thereby improving the compatibility between the base asphalt and the SBS resin.

[0047] According to an embodiment of the present invention, the temperature of the second mixed heating is 75-85°C, for example, 75°C, 78°C, 82°C or 85°C, and the time is 1.5-2.5h, for example, 1.5h, 2h or 2.5h, preferably 2h. Adjusting the temperature and time of the second mixed heating within the above range helps to promote the free radical polymerization reaction of the acrylic monomer under the action of the initiator. The appropriate temperature helps to ensure that the acrylic monomer is fully converted into a polymerized state and reduce the presence of unreacted monomers. The initiator includes at least one of potassium persulfate and ammonium persulfate. Potassium persulfate and ammonium persulfate are strong oxidants that decompose under heating conditions to generate sulfate radicals. These radicals can supply double bonds in the acrylic monomer, initiate chain growth reactions, and generate self-emulsifying epoxy-modified acrylic emulsions. The emulsifier includes at least one of allyloxy nonylphenol polyoxyethylene (10) ether ammonium sulfate (DNS-86), allyloxy nonylphenol polyoxyethylene ether (ANPEO10), and allyloxy hydroxypropane sulfonate sodium (HAPS). The above emulsifier has good emulsification effect, can effectively prevent the aggregation of particles in the acrylic emulsion, and maintain good fluidity.

[0048] According to an embodiment of the present invention, after the second mixing and heating, it also includes: adding alkali solution to adjust the pH value to 9-11, for example, it can be 9, 10 or 11. The alkali solution can be, for example, aqueous ammonia, and adjusting it to an alkaline state helps to keep the self-emulsifying epoxy-modified acrylic emulsion in an ionized state, making it more stable and avoiding the aggregation of emulsion particles. The acrylic monomer includes at least one of butyl acrylate and methyl methacrylate, preferably butyl acrylate and methyl methacrylate are used in combination, wherein butyl acrylate provides an acrylic monomer in the polymerization process, and methyl methacrylate provides low-temperature flexibility, which further improves the flexibility of the coating film after the subsequent formation of the coating film. The epoxy solution is prepared by dissolving an epoxy resin in an organic solvent; the epoxy resin includes at least one of E-12 epoxy resin, E-20 epoxy resin, and E-44 epoxy resin. It was found during the experiment that the coating film formed by the water-based asphalt coating prepared by the above-mentioned epoxy resin has better water resistance and better mechanical properties.

[0049] According to an embodiment of the present invention, the total mass fraction of acrylic acid monomer, emulsifier and water is 100 parts, and the mass fraction of acrylic acid monomer is 40-60 parts, for example, 40 parts, 45 parts, 50 parts, 55 parts or 60 parts. When the acrylic acid monomer is a mixture of butyl acrylate and methyl methacrylate, the mass fraction of butyl acrylate is 35-50 parts, for example, 35 parts, 40 parts, 45 parts or 50 parts, and the mass fraction of methyl methacrylate is 5-10 parts, for example, 5 parts, 8 parts or 10 parts. The mass fraction of emulsifier is 0.5-2 parts, for example, 0.5 parts, 1 parts, 1.5 parts or 2 parts. The emulsifier is preferably a polymeric emulsifier that can be grafted onto the acrylic acid monomer. The mass fraction of epoxy solution is 5-10 parts, for example, 5 parts, 5.5 parts, 6 parts, 7 parts, 8 parts, 9 parts or 10 parts. The mass fraction of the initiator is 0.1 to 1 part, for example, it can be 0.1 part, 0.2 part, 0.5 part or 1 part. The addition fractions of the several raw materials are limited to the above ranges respectively, so that without adding other emulsifiers, the B component itself has a good emulsification effect through grafting modification, so that the asphalt coating of the present invention is water-based and more environmentally friendly in subsequent applications.

[0050] According to an embodiment of the present invention, the heating dispersion includes adding 155-175°C maleic anhydride modified asphalt to a self-emulsifying epoxy modified acrylic emulsion at a temperature of 75-85°C. Since the self-emulsifying epoxy modified acrylic emulsion is water-based, the temperature needs to be adjusted below 100°C, and the maleic anhydride modified asphalt is an asphalt phase part, which requires a relatively higher temperature to maintain good fluidity. Therefore, when component A is mixed with component B, it is necessary to keep the temperature of component A between 155 and 175°C, so as to keep component A with good fluidity, which helps to disperse and mix uniformly between component A and component B. The dispersion time is 14-16 minutes, for example, 14 minutes, 15 minutes or 16 minutes, preferably 15 minutes, and the dispersion speed is 5000-8000 rpm, for example, 5000 rpm, 6000 rpm, 7000 rpm or 8000 rpm. Adjusting the parameters of the heating dispersion to the above ranges is helpful to fully contact the component A and the component B, so that the maleic anhydride group and the epoxy group can interact more fully.

[0051] According to an embodiment of the present invention, the graphene-modified glass fiber is prepared by the following steps: after graphene and silane coupling agent are dispersed and mixed in hydrogen peroxide, the graphene is added to the glass fiber so that the graphene is precipitated and adsorbed on the surface of the glass fiber to obtain the graphene-modified glass fiber; the silane coupling agent includes at least one of a vinyl coupling agent, an amino coupling agent, and an epoxy coupling agent. The graphene is precipitated and adsorbed on the surface of the glass fiber, which can improve the mechanical properties of the glass fiber. The silane coupling agent can promote the interaction between graphene and the glass fiber, and enhance the interfacial adhesion and compatibility. Hydrogen peroxide is a strong oxidant, which can modify the surface of graphene, introduce more oxygen-containing functional groups, and increase the hydrophilicity and reactivity of graphene. The stable attachment of graphene on the glass fiber is achieved through the synergistic effect of the silane coupling agent and the precipitation and adsorption of graphene.

[0052] It should be noted that, in the process of preparing the water-based asphalt coating, additives may be added as needed, such as pH additives, preservatives, and thickeners. The above additives help to improve the stability, anti-corrosion performance, and thickening performance of the water-based asphalt coating.

[0053] The mass parts of water-based asphalt coating, graphene-modified glass fiber, pH additive, preservative and thickener are 100: (1~8): (0.1~1): (0.1~0.5): (0.5~3).

[0054] According to an embodiment of still another aspect of the present invention, there is provided a composite waterproof structure, comprising an asphalt roll material and a waterproof coating formed by the above-mentioned water-based asphalt coating.

[0055] According to the embodiments of the present invention, the asphalt coil has good waterproof performance and can withstand certain stress. The waterproof coating covering the asphalt coil helps to fill the small cracks and gaps of the asphalt coil, and is tightly combined with the asphalt coil to provide additional waterproof protection. In addition, water-based asphalt coatings are relatively environmentally friendly, and less volatile organic compounds are emitted during construction, which is beneficial to environmental protection. The above-mentioned composite waterproof structure can not only improve the waterproof effect by stacking, but also extend the service life of the building and reduce maintenance costs.

[0056] In one specific embodiment, the preparation process of the water-based asphalt coating may include the following steps:

[0057] The base asphalt is heated to 155-175°C, and the maleic anhydride-modified SBS resin XIRAN2000 is added, and the mixture is stirred and mixed while being kept warm to obtain the maleic anhydride-modified asphalt.

[0058] The epoxy resin was pre-dissolved in propylene glycol methyl ether to prepare an epoxy solution with a mass concentration of 60%.

[0059] Based on the total mass parts of acrylic monomer, emulsifier and water as 100 parts, 35-50 parts of butyl acrylate, 5-10 parts of methyl methacrylate and 0.5-2 parts of polymeric emulsifier are added into water and mixed evenly into 100 parts of solution, the temperature is raised to 80°C, and 0.2 parts of potassium persulfate and 5-10 parts of epoxy solution are added dropwise, the temperature is maintained at 80°C and stirring is continued for 2 hours, the pH value is adjusted to 9-11 with ammonia water, and then cooled and filtered to obtain a self-emulsifying epoxy-modified acrylic emulsion.

[0060] Heat 100 parts of modified acrylic emulsion to 80°C, use a homogenizer to disperse at high speed at a speed of 5000-8000rpm, slowly pour 80-150 parts of 155-175°C maleic anhydride modified asphalt, and disperse for 15 minutes to obtain a water-based asphalt coating.

[0061] 10 parts of graphene and 2 parts of silane coupling agent are added to hydrogen peroxide for ultrasonic dispersion, and then 20-40 parts of glass fiber with a length of less than 1 mm are added. After continuing ultrasonic dispersion for 2-4 hours, the solution is dried at 105° C. to obtain graphene-modified glass fiber.

[0062] 100 parts of water-based asphalt coating, 1-8 parts of graphene-modified glass fiber, 0.1-1 parts of pH regulator, 0.1-0.5 parts of preservative, and 0.5-3 parts of thickener are mixed and stirred evenly to prepare a finished water-based asphalt coating.

[0063] The present invention is further described below by embodiments and related test experiments and results thereof. In the detailed description below, for ease of explanation, many specific details are set forth to provide a comprehensive understanding of the embodiments of the present invention. However, it is obvious that one or more embodiments may also be implemented without these specific details. And, in the absence of conflict, the details in the following embodiments may be combined into other feasible embodiments at will.

[0064] It should be noted that the following specific examples are only for illustration, and the protection scope of the present invention is not limited thereto. The chemicals and raw materials used in the following examples are all commercially available or homemade by recognized processing methods.

[0065] Embodiment 1:

[0066] The base asphalt was heated to 175° C., and 5% of the weight of the base asphalt was added with maleic anhydride-modified SBS resin, and the mixture was stirred and mixed for 2 hours to obtain maleic anhydride-modified asphalt.

[0067] The epoxy resin E12 was pre-dissolved in propylene glycol methyl ether to prepare an epoxy solution with a mass concentration of 60%.

[0068] In terms of mass, 40 parts of butyl acrylate, 10 parts of methyl methacrylate and 1.5 parts of emulsifier DNS-86 were added to water and mixed evenly to make 100 parts, the temperature was raised to 80°C, and 0.2 parts of potassium persulfate and 5.5 parts of epoxy solution were added dropwise. The temperature was maintained at 80°C and stirred for 2 hours. The pH value was adjusted to 9-11 with ammonia water, and then cooled and filtered to obtain a self-emulsifying epoxy-modified acrylic emulsion A.

[0069] In parts by weight, 100 parts of self-emulsifying epoxy-modified acrylic emulsion A were heated to 80°C and dispersed at high speed using a homogenizer at a speed of 8000 rpm. 80 parts of 175°C maleic anhydride-modified asphalt were slowly poured in and dispersed for 15 minutes to obtain modified emulsified asphalt.

[0070] 10 parts of graphene and 2 parts of silane coupling agent were added to hydrogen peroxide for ultrasonic dispersion, and then 40 parts of glass fiber with a length of less than 1 mm were added. After ultrasonic dispersion was continued for 4 hours, the solution was dried at 105° C. to obtain graphene-modified glass fiber.

[0071] 100 parts of modified emulsified asphalt, 5 parts of graphene modified glass fiber, 0.3 parts of pH adjuster, 0.1 parts of preservative and 1 part of thickener were mixed and stirred evenly to prepare a water-based asphalt waterproof coating 1.

[0072] Embodiment 2:

[0073] The base asphalt was heated to 155° C., and 3% of the weight of the base asphalt was added with maleic anhydride-modified SBS resin, and the mixture was stirred and mixed for 2 hours to obtain maleic anhydride-modified asphalt.

[0074] In parts by mass, 100 parts of the self-emulsifying epoxy-modified acrylic emulsion A prepared in Example 1 were heated to 80°C and dispersed at high speed using a homogenizer at a speed of 6000 rpm. 150 parts of 155°C maleic anhydride-modified asphalt were slowly poured in and dispersed for 15 minutes to obtain modified emulsified asphalt.

[0075] 100 parts of modified emulsified asphalt, 2 parts of graphene-modified glass fiber prepared in Example 1, 0.3 parts of pH regulator, 0.1 parts of preservative, and 1.5 parts of thickener were mixed and stirred evenly to prepare a water-based asphalt waterproof coating 2.

[0076] Embodiment 3:

[0077] The base asphalt was heated to 175° C., and 10% of the weight of the base asphalt was added with maleic anhydride-modified SBS resin, and the mixture was stirred for 2 hours to obtain maleic anhydride-modified asphalt.

[0078] In parts by mass, 100 parts of the self-emulsifying epoxy-modified acrylic emulsion A prepared in Example 1 were heated to 80°C and dispersed at high speed using a homogenizer at a speed of 8000 rpm. 100 parts of 175°C maleic anhydride-modified asphalt were slowly poured in and dispersed for 15 minutes to obtain modified emulsified asphalt.

[0079] 100 parts of modified emulsified asphalt, 3 parts of graphene-modified glass fiber prepared in Example 1, 0.3 parts of pH regulator, 0.1 parts of preservative, and 3 parts of thickener were mixed and stirred evenly to prepare a water-based asphalt waterproof coating 3.

[0080] Embodiment 4:

[0081] The base asphalt was heated to 175° C., and 8% of the weight of the base asphalt was added with maleic anhydride-modified SBS resin, and the mixture was stirred and mixed for 2 hours to obtain maleic anhydride-modified asphalt.

[0082] The epoxy resin E44 was pre-dissolved in propylene glycol methyl ether to prepare an epoxy solution with a mass concentration of 60%.

[0083] In terms of mass, 45 parts of butyl acrylate, 5 parts of methyl methacrylate and 1.5 parts of emulsifier ANPEO10 were added to water and mixed evenly to make 100 parts, the temperature was raised to 80°C, and 0.2 parts of potassium persulfate and 5.5 parts of epoxy solution were added dropwise. The temperature was maintained at 80°C and stirred for 2 hours. The pH value was adjusted to 9-11 with ammonia water, and then cooled and filtered to obtain a self-emulsifying epoxy-modified acrylic emulsion B.

[0084] 100 parts of self-emulsifying epoxy modified acrylic emulsion B were heated to 80°C and dispersed at high speed using a homogenizer at a speed of 8000 rpm. 100 parts of 175°C maleic anhydride modified asphalt were slowly poured in and dispersed for 15 minutes to obtain modified emulsified asphalt.

[0085] 100 parts of modified emulsified asphalt, 8 parts of graphene-modified glass fiber prepared in Example 1, 0.3 parts of pH regulator, 0.1 parts of preservative, and 2 parts of thickener were mixed and stirred evenly to prepare a water-based asphalt waterproof coating 4.

[0086] Embodiment 5:

[0087] The base asphalt was heated to 165° C., and a maleic anhydride-modified resin in an amount of 6% by weight of the base asphalt was added, and the mixture was stirred and mixed for 2 hours to obtain a maleic anhydride-modified asphalt.

[0088] In parts by mass, 100 parts of the self-emulsifying epoxy-modified acrylic emulsion B prepared in Example 4 were heated to 80°C and dispersed at high speed using a homogenizer at a speed of 6000 rpm. 150 parts of 165°C maleic anhydride-modified asphalt were slowly poured in and dispersed for 15 minutes to obtain modified emulsified asphalt.

[0089] 100 parts of modified emulsified asphalt, 5 parts of graphene-modified glass fiber prepared in Example 1, 0.3 parts of pH regulator, 0.1 parts of preservative, and 2 parts of thickener were mixed and stirred evenly to prepare a water-based asphalt waterproof coating 5.

[0090] Comparative Example 1:

[0091] By weight, 100 parts of base emulsified asphalt, 100 parts of commercially available acrylic emulsion, 0.3 parts of pH adjuster, 0.1 parts of preservative, and 1 part of thickener were mixed and stirred uniformly to prepare a water-based asphalt waterproof coating 1'.

[0092] Comparative Example 2:

[0093] By weight, 100 parts of base emulsified asphalt, 100 parts of commercially available acrylic emulsion, 5 parts of glass fiber, 0.3 parts of pH adjuster, 0.1 parts of preservative, and 1 part of thickener were mixed and stirred evenly to prepare a water-based asphalt waterproof coating 2'.

[0094] The water-based asphalt waterproof coatings prepared in Examples 1 to 5 and Comparative Examples 1 to 2 were tested, and the test results are shown in Table 1 below.

[0095] Table 1 Performance test results of products of embodiments and comparative examples

[0096]

[0097] As shown in the relevant data in Table 1, the tensile strength, bonding strength, composite adhesion of coiled materials, bonding strength retention after immersion in water, tensile strength after immersion in water, and peeling strength from coiled materials of Examples 1 to 5 are much higher than those of Comparative Examples 1 and 2, and the water absorption of Examples 1 to 5 is much lower than that of Comparative Examples 1 and 2, indicating that the water-based asphalt coating prepared by the method of the present invention has better water resistance, lower water absorption, and better mechanical properties than the comparative examples. In addition, the elongation at break of Examples 1 to 5 is neither too high like that of Comparative Example 1, which makes the material too soft, nor too low like that of Comparative Example 2, which makes the material too hard, indicating that the water-based asphalt coating of Examples 1 to 5 is more suitable for bonding with substrates such as concrete, and the elongation at break is maintained at a moderate level, which can maintain the stability and integrity of the structure.

[0098] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A water-based asphalt coating, comprising: A mixture of component A and component B, wherein Component A: maleic anhydride modified asphalt, which is a blend of base asphalt and maleic anhydride modified resin, wherein the mass of the maleic anhydride modified resin is 3-10% of the base asphalt; Component B: self-emulsifying epoxy-modified acrylic emulsion, which is an emulsion formed by acrylic polymer grafted with an emulsifier and epoxy resin; The maleic anhydride modified resin includes maleic anhydride modified SBS resin.

2. The water-based asphalt coating according to claim 1, further comprising: Component C: graphene modified glass fiber.

3. The water-based asphalt coating according to claim 1 or 2, wherein: The mass ratio of component A to component B is (8~15):

10.

4. The water-based asphalt coating according to claim 2, wherein the mass of component C is 1 to 8% of the water-based asphalt coating.

5. A method for preparing a water-based asphalt coating as claimed in any one of claims 1 to 4, comprising: The base asphalt and the maleic anhydride modified resin are first mixed and heated to obtain a component A; The acrylic monomer and the emulsifier are added to water respectively, and the mixture is mixed and heated with the epoxy solution under the action of the initiator to obtain component B; Component A and component B are mixed and heated and dispersed to obtain the water-based asphalt coating.

6. The preparation method according to claim 5, further comprising: The water-based asphalt coating and the graphene-modified glass fiber are mixed and stirred to obtain a finished water-based asphalt coating.

7. The preparation method according to claim 5, wherein: The first mixing and heating temperature is 155-175°C and the time is 1.5-2.5h; The temperature of the second mixed heating is 75-85°C and the time is 1.5-2.5h; The initiator includes at least one of potassium persulfate and ammonium persulfate; The emulsifier includes at least one of allyloxy nonylphenol polyoxyethylene (10) ether ammonium sulfate, allyloxy nonylphenol polyoxyethylene ether, and allyloxy hydroxypropane sulfonate sodium; The acrylic acid monomer includes at least one of butyl acrylate and methyl methacrylate; The epoxy solution is prepared by dissolving epoxy resin in an organic solvent; The epoxy resin includes at least one of E-12 epoxy resin, E-20 epoxy resin, and E-44 epoxy resin; Based on 100 parts by weight of the total of acrylic monomer, emulsifier and water, the mass fraction of the acrylic monomer is 40-60 parts, the mass fraction of the emulsifier is 0.5-2 parts, and the mass fraction of the epoxy solution is 5-10 parts.

8. The preparation method according to claim 5, wherein: The heating dispersion comprises adding maleic anhydride modified asphalt at 155-175° C. into a self-emulsifying epoxy modified acrylic emulsion at a temperature of 75-85° C., with a dispersion time of 14-16 minutes and a dispersion rotation speed of 5000-8000 rpm.

9. The preparation method according to claim 6, wherein: The graphene-modified glass fiber is prepared by the following steps: The graphene and the silane coupling agent are dispersed and mixed in hydrogen peroxide and then added to the glass fiber, so that the graphene is precipitated and adsorbed on the surface of the glass fiber to obtain the graphene-modified glass fiber; The silane coupling agent includes at least one of a vinyl coupling agent, an amino coupling agent, and an epoxy coupling agent.

10. A composite waterproof structure, comprising an asphalt coil and a waterproof coating formed by the water-based asphalt coating according to any one of claims 1 to 4.

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