Water-based asphalt coating, method for preparing the same, and composite waterproof structure

Abstract

The application provides a water-based asphalt coating and 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 and B component, the A component is 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; the B component is a self-emulsifying epoxy modified acrylic emulsion, which is an emulsion formed by an emulsifier grafted acrylic polymer and an epoxy resin. The B component has a self-emulsifying property, so that the B component can be dispersed in water, the epoxy groups in the B component can chemically react with the anhydride groups in the A component, a stable crosslinked structure is formed inside 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 present application relates to the technical field of modified asphalt, and particularly relates to a water-based asphalt coating, a preparation method thereof and a composite waterproof structure. BACKGROUND

[0002] With the increasing demand for waterproofing in construction engineering and municipal engineering, the composite waterproof structure of 'coating + roll material' has a wider application space. The asphalt waterproof coating has good compatibility with the asphalt roll material, and can be used in a large amount in the composite waterproof system of 'coating + roll material' composed of the asphalt roll material.

[0003] The traditional water-based asphalt coating is modified by using rubber emulsion or SBS (styrene-butadiene-styrene), but the waterproof effect is poor, and the water resistance and adhesion to the base layer are poor. SUMMARY

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

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

[0006] According to an embodiment of the present application, the water-based asphalt coating further comprises: C component, which is graphene modified glass fiber.

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

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

[0009] According to an embodiment of the present application, a preparation method of the water-based asphalt coating is provided, comprising: mixing and heating the base asphalt and the maleic anhydride modified resin to obtain the A component; adding the acrylic monomer and the emulsifier into water respectively, and mixing and heating the water with the epoxy solution under the action of the initiator to obtain the B component; and mixing and heating the A component and the B component to obtain the water-based asphalt coating.

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

[0011] According to the embodiment of the present application, the temperature of the first mixing and heating is 155-175℃, and the time is 1.5-2.5h; the temperature of the second mixing and heating is 75-85℃, and the time is 1.5-2.5h; the initiator comprises at least one of potassium persulfate and ammonium persulfate; the emulsifier comprises at least one of allyloxy nonyl phenol polyoxyethylene (10) ether ammonium sulfate, allyloxy nonyl phenol polyoxyethylene ether, and sodium allyloxy hydroxypropyl sulfonate; the acrylic monomer comprises at least one of butyl acrylate and methyl methacrylate; the epoxy solution is prepared by dissolving an epoxy resin in an organic solvent; and the epoxy resin comprises at least one of E-12 type epoxy resin, E-20 type epoxy resin, and E-44 type epoxy resin.

[0012] According to the embodiment of the present application, 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, based on the total of 100 parts of the mass fractions of the acrylic monomer, the emulsifier, and the water.

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

[0014] According to the embodiment of the present application, the heating and dispersing comprises: adding maleic anhydride modified asphalt at 155-175℃ to self-emulsifying epoxy modified acrylic emulsion at a temperature of 75-85℃, and dispersing for 14-16min at a rotation speed of 5000-8000rpm.

[0015] According to the embodiment of the present application, the graphene modified glass fiber is prepared by the following steps: dispersing and mixing graphene and silane coupling agent in hydrogen peroxide, and then adding glass fiber to make the graphene adsorb on the surface of the glass fiber to obtain graphene modified glass fiber; and the silane coupling agent comprises at least one of vinyl coupling agent, amino coupling agent, and epoxy coupling agent.

[0016] According to the embodiment of the present application, the graphene modified glass fiber is prepared by the following steps: dispersing and mixing graphene and silane coupling agent in hydrogen peroxide, and then adding glass fiber to make the graphene adsorb on the surface of the glass fiber to obtain graphene modified glass fiber; and the silane coupling agent comprises at least one of vinyl coupling agent, amino coupling agent, and epoxy coupling agent.

[0017] According to the embodiment of the present application, by the chemical reaction of the acid anhydride group in the A component and the epoxy group in the B component, a crosslinked network is formed in the coated film, 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 application has the characteristics of low water absorption, good water resistance and strong waterproofness after curing and forming, and has better adhesion and mechanical properties compared with traditional products.

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

[0019] The above and other objects, features and advantages of the present application will become more apparent from the following description of the embodiments of the present application taken in conjunction with the accompanying drawings, in which:

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

[0021] Hereinafter, embodiments of the present application will be described with reference to the accompanying drawings. It is to be understood, however, that these descriptions are merely exemplary and are intended to illustrate the scope of the present application, not to limit it. In the following detailed description of the embodiments of the present application, numerous specific details are set forth in order to provide a thorough understanding of the embodiments of the present application. However, it will be apparent to one skilled in the art that one or more embodiments of the present application can be practiced without these specific details. In other instances, well-known structures and functions have been omitted to avoid unnecessarily complicating the present application with details that will be readily understood by those skilled in the art.

[0022] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the present application. As used herein, the term "includes" indicates the presence of the features, steps, operations, but does not exclude the presence or addition of one or more other features.

[0023] In the case where expressions such as "at least one of A, B, and C, etc." are used, it generally should be interpreted to include at least one of A, B, and C, etc. (for example, "a system having at least one of A, B, and C" should include a system having A alone, a system having B alone, a system having C alone, a system having A and B together, a system having A and C together, a system having B and C together, and / or a system having A, B, and C together, etc.). In the case where expressions such as "at least one of A, B, or C, etc." are used, it generally should be interpreted to include at least one of A, B, or C, etc. (for example, "a system having at least one of A, B, or C" should include a system having A alone, a system having B alone, a system having C alone, a system having A and B together, a system having A and C together, a system having B and C together, and / or a system having A, B, and C together, etc.).

[0024] Traditional water-based asphalt coating has the problems of poor waterproof effect, poor water resistance, weak adhesion, etc. In the process of realizing the concept of the present application, it is found that by using an acrylic emulsion as a modifier and uniformly dispersing it in the asphalt emulsion by a physical method, a new stable heterogeneous system can be constructed, which can change the rheological properties, viscoelasticity and ductility of the asphalt, and improve the adhesion strength and water impermeability of the product. However, due to the presence of a large number of hydrophilic groups such as carboxyl and ester groups in the acrylic emulsion, the water resistance of the waterproof coating film after curing and forming is reduced, and problems such as swelling, bubbles and peeling are prone to occur.

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

[0026] Therefore, the present application uses maleic anhydride modified asphalt as component A and self-emulsifying epoxy-modified acrylic emulsion as component B, utilizes the chemical reaction between anhydride groups and epoxy groups to form a crosslinked structure inside the asphalt coating, thereby improving the water resistance of the water-based asphalt coating, reducing the water absorption rate, and improving the adhesion and mechanical properties of the water-based asphalt coating.

[0027] Specifically, according to an embodiment of one aspect of the present application, 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 grafting an emulsifier to an acrylic polymer and an epoxy resin, the maleic anhydride modified resin comprising maleic anhydride modified SBS resin.

[0028] According to the embodiment of the present application, the maleic anhydride modified asphalt can be understood as a chemical modification of asphalt by introducing maleic anhydride groups. The modification of maleic anhydride can enhance the compatibility of asphalt with component B and reduce the occurrence of separation. Moreover, the maleic anhydride groups can interact with the epoxy groups in component B during the curing process to form a crosslinked network structure. Such crosslinked network structure helps to improve the tightness of the coating film (formed after the coating is dried), 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 film more solid and durable.

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

[0030] It should be noted that the cross-linked network structure formed between the A component and the B component 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 almost has no obvious defects or holes, greatly limiting the water penetration path. The water-based asphalt coating realizes excellent water resistance and extremely low water absorption, prolonging the service life.

[0031] The mass of the maleic anhydride modified resin is 3-10% of the base asphalt, for example, it can be 3%, 5%, 7%, 9% or 10%. Adjusting the ratio of the two within the above range helps to fully mix the base asphalt with the maleic anhydride modified SBS resin, so that the maleic anhydride interacts with the polar groups in the base asphalt, improving the compatibility between the base asphalt and the SBS resin, and also not affecting the performance of the base asphalt due to the addition of too much.

[0032] According to the embodiments of the present application, the mass ratio of the A component and the B component 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 have enough reaction sites between the maleic anhydride groups and the epoxy groups, so that the cross-linked network structure can be fully formed. If too much A component is used, it may cause unreacted maleic anhydride to remain, affecting the performance of the final water-based asphalt coating; if too much B component is used, it may cause unnecessary side reactions due to excessive epoxy groups. In addition, the above ratio helps to maintain the stability of the emulsion system and prevent the occurrence of delamination or precipitation.

[0033] According to the embodiments of the present application, the water-based asphalt coating further comprises: C component: graphene modified glass fiber. The graphene modified glass fiber can be understood as a composite material prepared by introducing graphene into glass fiber. The addition of the C component makes the surface of the glass fiber rougher and increases the 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 the concrete, overcoming the problem that conventional glass fiber is easy to slip off in asphalt coating and has poor performance improvement effect. The addition of the C component improves the anti-slip performance of the coating film and the adhesion between the coating film and the concrete base.

[0034] According to an embodiment of the present application, the mass of the C component is 1-8% of the water-based asphalt coating, for example, can be 1%, 2%, 3%, 4%, 5%, 6%, 7% or 8%, etc. The addition of the mass of the C component in 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 the C component is too small, the mechanical strength of the water-based asphalt coating is limited; if the mass of the C component is too large, the coating film formed after curing is too hard to lose the necessary flexibility, affecting the application effect of the coating film on the curved or stretched surface.

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

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

[0037] Directly mixing SBS (styrene-butadiene-styrene) resin with base asphalt, the compatibility between the two is poor, by using maleic anhydride to modify the SBS resin, the compatibility between the base asphalt and the SBS resin can be better, because the maleic anhydride group can interact with the polar components in the base asphalt, making the two more closely combined, and further reacting with the B component, which helps to improve the mechanical properties and durability of the water-based asphalt coating.

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

[0039] The emulsifier is preferably a polymer emulsifier, which can be grafted with the acrylic monomer, and under the action of the initiator, an epoxy modified acrylic emulsion with self-emulsifying properties can be generated. The emulsifier has the characteristics of one end being hydrophilic and the other end being lipophilic, and after self-emulsification, the water-based asphalt coating itself has the effect of the emulsifier, which can uniformly disperse the non-hydrophilic oily material in the water matrix. Since the B component is self-emulsified, no additional emulsifier is needed, 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, the A component and the B component are mixed and heated to disperse to obtain the water-based asphalt coating.

[0041] The heating dispersion helps to make the mixing between the A component and the B component more uniform, and the maleic anhydride groups and the epoxy groups interact more fully, thereby helping to form a dense crosslinking network structure, improving the water resistance of the cured coating film, and improving the mechanical properties of the water-based asphalt coating.

[0042] According to the embodiment of the present application, by S101-S103, the maleic anhydride groups and the epoxy groups interact to form ester bonds, forming a dense crosslinking network structure in the water-based asphalt coating, 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. And the emulsifier is grafted on the B component, and the water-based asphalt coating is emulsified, which helps to be dispersed in the suspension state in water, and no additional emulsifier is needed in the preparation process, further improving the water resistance of the water-based asphalt coating.

[0043] According to the embodiment of the present application, the preparation method can further comprise: mixing and stirring the water-based asphalt coating with the graphene modified glass fiber to obtain a water-based asphalt coating product.

[0044] According to the embodiment of the present application, by adding graphene to the glass fiber, in-situ deposition and adsorption of graphene on the surface of the glass fiber can be achieved, so that the water-based asphalt coating product has good compatibility with the substrate such as concrete, overcoming the problem that the conventional glass fiber is easy to slip off in the water-based asphalt coating and has poor performance improvement effect on the water-based asphalt coating. The graphene modification can improve the anti-slip performance of the coating film, improve the adhesion between the coating film and the substrate such as concrete, and improve the service life of the coating film.

[0045] Preferably, the length of the glass fiber can be less than 1mm. The reason is that too long glass fiber will cause agglomeration of the glass fiber, and the dispersion effect is not good, and the mechanical properties and anti-slip effect of the water-based asphalt coating are limited.

[0046] According to the embodiment of the present application, the temperature of the first mixed heating is 155-175℃, for example, it can be 155℃, 160℃, 165℃, 170℃ or 175℃, and the time is 1.5-2.5h, for example, it can be 1.5h, 2h or 2.5h, preferably 2h. Adjusting the temperature and time of the first mixed heating in the above range helps to mix the base asphalt and the maleic anhydride modified resin sufficiently, so that the maleic anhydride and the polar groups in the base asphalt interact, improving the compatibility between the base asphalt and the SBS resin.

[0047] According to an embodiment of the present application, the second mixture is heated at a temperature of 75-85°C, for example, 75°C, 78°C, 82°C or 85°C, for a time period of 1.5-2.5h, for example, 1.5h, 2h or 2.5h, preferably 2h. The temperature and time period of heating the second mixture are adjusted within the above ranges to facilitate the free radical polymerization of the acrylic monomers under the action of the initiator, and the suitable temperature helps to ensure that the acrylic monomers are sufficiently converted into a polymerized state, reducing 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, which decompose under heating to generate sulfate radicals, which can provide double bonds in the acrylic monomers to initiate chain growth reactions to generate the self-emulsifying epoxy-modified acrylic emulsion. The emulsifier includes at least one of allyloxy nonylphenol polyoxyethylene (10) ether ammonium sulfate (DNS-86), allyloxy nonylphenol polyoxyethylene ether (ANPEO10) and sodium allyloxy hydroxypropyl sulfonate (HAPS). The above emulsifiers have good emulsifying effect, which can effectively prevent the aggregation of particles in the acrylic emulsion, maintaining good fluidity.

[0048] According to an embodiment of the present application, after the second mixture is heated, further comprising adjusting the pH value to 9-11, for example, 9, 10 or 11, by adding a lye. The lye, for example, can be ammonia, which is adjusted to an alkaline state to help 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 monomers include at least one of butyl acrylate and methyl methacrylate, preferably a combination of butyl acrylate and methyl methacrylate, wherein the butyl acrylate provides the acrylic monomers in the polymerization process, and the methyl methacrylate provides low-temperature flexibility, further improving 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 type epoxy resin, E-20 type epoxy resin and E-44 type epoxy resin. It is found in the experiment that the coating film formed by the above epoxy resin for preparing the water-based asphalt coating has better water resistance and better mechanical properties.

[0049] According to the embodiment of the present application, the mass fraction of the acrylic monomer is 40-60 parts, for example, it can be 40 parts, 45 parts, 50 parts, 55 parts or 60 parts, etc., based on the total of 100 parts of the mass fraction of the acrylic monomer, the emulsifier and water. When the acrylic monomer is a mixture of butyl acrylate and methyl methacrylate, the mass fraction of butyl acrylate is 35-50 parts, for example, it can be 35 parts, 40 parts, 45 parts or 50 parts, and the mass fraction of methyl methacrylate is 5-10 parts, for example, it can be 5 parts, 8 parts or 10 parts. The mass fraction of the emulsifier is 0.5-2 parts, for example, it can be 0.5 parts, 1 part, 1.5 parts or 2 parts. The emulsifier is preferably a polymer emulsifier, which can be grafted onto the acrylic monomer. The mass fraction of the epoxy solution is 5-10 parts, for example, it can be 5 parts, 5.5 parts, 6 parts, 7 parts, 8 parts, 9 parts or 10 parts. The mass fraction of the initiator is 0.1-1 parts, for example, it can be 0.1 parts, 0.2 parts, 0.5 parts or 1 parts. By limiting the addition fraction of several raw materials within the above range, the B component itself has good emulsifying effect through graft modification without adding other emulsifiers, so that the asphalt coating of the present application is water-based and more environmentally friendly in subsequent application.

[0050] According to the embodiment of the present application, the heating dispersion includes adding maleic anhydride modified asphalt at 155-175℃ into self-emulsifying epoxy modified acrylic emulsion at a temperature of 75-85℃. Since the self-emulsifying epoxy modified acrylic emulsion is water-based, the temperature needs to be adjusted below 100℃, and the maleic anhydride modified asphalt is an asphalt phase part, which needs a relatively higher temperature to maintain good fluidity. Therefore, when the A component is mixed with the B component, the temperature of the A component needs to be maintained at 155-175℃, so that the A component has good fluidity, which helps the dispersion and mixing uniformity between the A component and the B component. The dispersion time is 14-16 min, for example, it can be 14 min, 15 min or 16 min, preferably 15 min, and the dispersion rotation speed is 5000-8000 rpm, for example, it can be 5000 rpm, 6000 rpm, 7000 rpm or 8000 rpm. By adjusting the parameters of the heating dispersion to the above range, the A component and the B component are fully contacted, and the maleic anhydride group and the epoxy group interact more fully.

[0051] According to an embodiment of the present application, the graphene modified glass fiber is prepared by the following steps: graphene and silane coupling agent are mixed and dispersed in hydrogen peroxide, and then added to glass fiber, so that the graphene is 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. The graphene is 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 the graphene and the glass fiber, enhance the interfacial adhesion and compatibility. The hydrogen peroxide is a strong oxidizing agent, which can modify the surface of the graphene, introduce more oxygen-containing functional groups, and increase the hydrophilicity and reactivity of the graphene. Through the synergistic effect of the silane coupling agent and the adsorption of the graphene, the graphene is stably attached to the glass fiber.

[0052] It should be noted that during the preparation of the water-based asphalt coating, additives such as pH additives, preservatives, and thickening agents can be added as needed. The above-mentioned additives help to improve the stability, corrosion resistance, and thickening performance of the water-based asphalt coating.

[0053] The mass fraction of the water-based asphalt coating, graphene modified glass fiber, pH additive, preservative, and thickening agent is 100: (1-8): (0.1-1): (0.1-0.5): (0.5-3).

[0054] According to an embodiment of the present application, a composite waterproof structure is provided, which includes an asphalt roll and a waterproof coating formed by the water-based asphalt coating.

[0055] According to an embodiment of the present application, the asphalt roll has good waterproof performance and can withstand a certain stress. The waterproof coating covering the asphalt roll helps to fill the small cracks and voids of the asphalt roll, tightly combines with the asphalt roll, and provides additional waterproof protection. In addition, the water-based asphalt coating is relatively environmentally friendly, has less volatile organic compound emission during construction, and is beneficial to environmental protection. The above-mentioned composite waterproof structure not only can improve the waterproof effect, but also can prolong the service life of the building and reduce the maintenance cost.

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

[0057] The base asphalt is heated to 155-175℃, and the maleic anhydride modified SBS resin XIRAN2000 is added, and the mixture is stirred and mixed to obtain a maleic anhydride modified asphalt.

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

[0059] With the sum of the mass fractions of acrylic monomer, emulsifier and water being 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 to mix uniformly into a solution of 100 parts, heated to 80℃, and 0.2 parts of potassium persulfate and 5-10 parts of epoxy solution are added dropwise, kept at 80℃ and continuously stirred for 2h, then cooled and filtered after adjusting the pH value to 9-11 using ammonia water, to obtain a self-emulsifying epoxy-modified acrylic emulsion.

[0060] 100 parts of the modified acrylic emulsion is heated to 80℃, and dispersed at a high speed using a homogenizer at a speed of 5000-8000 rpm, and 80-150 parts of maleic anhydride-modified asphalt at 155-175℃ is slowly poured in, and dispersed for 15 min to obtain a water-based asphalt coating.

[0061] 10 parts of graphene and 2 parts of silane coupling agent are added into hydrogen peroxide and ultrasonically dispersed, then 20-40 parts of glass fiber with a length of <1mm is added, and ultrasonically dispersed for 2-4h, and the solution is dried at 105℃ to obtain graphene-modified glass fiber.

[0062] 100 parts of the water-based asphalt coating, 1-8 parts of graphene-modified glass fiber, 0.1-1 parts of pH adjuster, 0.1-0.5 parts of preservative and 0.5-3 parts of thickening agent are mixed and stirred uniformly to prepare a water-based asphalt coating product.

[0063] The present application is further illustrated by the following examples and related test experiments and their results. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the embodiments of the present application. However, it will be apparent to one of ordinary skill in the art that one or more embodiments can be practiced without these specific details. In other instances, well-known methods have not been described in detail in order to avoid unnecessarily obscuring the present application.

[0064] It should be noted that the following specific examples are only illustrative, and the protection scope of the present application is not limited thereto. The chemicals and raw materials used in the following examples are commercially available or obtained by a recognized processing method.

[0065] Example 1:

[0066] The base asphalt is heated to 175℃, and 5% of maleic anhydride-modified SBS resin by weight of the base asphalt is added, and stirred and mixed for 2h to obtain maleic anhydride-modified asphalt.

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

[0068] In 100 parts of water, 40 parts of butyl acrylate, 10 parts of methyl methacrylate and 1.5 parts of emulsifier DNS-86 were mixed uniformly, heated to 80°C, and 0.2 parts of potassium persulfate and 5.5 parts of epoxy solution were added dropwise. The temperature was kept at 80°C and stirring was continued for 2h. After adjusting the pH value to 9-11 with ammonia water, the solution was cooled and filtered to obtain self-emulsifying epoxy modified acrylic emulsion A.

[0069] In 100 parts of water, 40 parts of butyl acrylate, 10 parts of methyl methacrylate and 1.5 parts of emulsifier DNS-86 were mixed uniformly, heated to 80°C, and 0.2 parts of potassium persulfate and 5.5 parts of epoxy solution were added dropwise. The temperature was kept at 80°C and stirring was continued for 2h. After adjusting the pH value to 9-11 with ammonia water, the solution was cooled and filtered to obtain self-emulsifying epoxy modified acrylic emulsion A.

[0070] In 100 parts of water, 40 parts of butyl acrylate, 10 parts of methyl methacrylate and 1.5 parts of emulsifier DNS-86 were mixed uniformly, heated to 80°C, and 0.2 parts of potassium persulfate and 5.5 parts of epoxy solution were added dropwise. The temperature was kept at 80°C and stirring was continued for 2h. After adjusting the pH value to 9-11 with ammonia water, the solution was cooled and filtered to obtain self-emulsifying epoxy modified acrylic emulsion A.

[0071] In 100 parts of water, 40 parts of butyl acrylate, 10 parts of methyl methacrylate and 1.5 parts of emulsifier DNS-86 were mixed uniformly, heated to 80°C, and 0.2 parts of potassium persulfate and 5.5 parts of epoxy solution were added dropwise. The temperature was kept at 80°C and stirring was continued for 2h. After adjusting the pH value to 9-11 with ammonia water, the solution was cooled and filtered to obtain self-emulsifying epoxy modified acrylic emulsion A.

[0072] Example 2:

[0073] In 100 parts of water, 40 parts of butyl acrylate, 10 parts of methyl methacrylate and 1.5 parts of emulsifier DNS-86 were mixed uniformly, heated to 80°C, and 0.2 parts of potassium persulfate and 5.5 parts of epoxy solution were added dropwise. The temperature was kept at 80°C and stirring was continued for 2h. After adjusting the pH value to 9-11 with ammonia water, the solution was cooled and filtered to obtain self-emulsifying epoxy modified acrylic emulsion A.

[0074] In 100 parts of water, 40 parts of butyl acrylate, 10 parts of methyl methacrylate and 1.5 parts of emulsifier DNS-86 were mixed uniformly, heated to 80°C, and 0.2 parts of potassium persulfate and 5.5 parts of epoxy solution were added dropwise. The temperature was kept at 80°C and stirring was continued for 2h. After adjusting the pH value to 9-11 with ammonia water, the solution was cooled and filtered to obtain self-emulsifying epoxy modified acrylic emulsion A.

[0075] In 100 parts of water, 40 parts of butyl acrylate, 10 parts of methyl methacrylate and 1.5 parts of emulsifier DNS-86 were mixed uniformly, heated to 80°C, and 0.2 parts of potassium persulfate and 5.5 parts of epoxy solution were added dropwise. The temperature was kept at 80°C and stirring was continued for 2h. After adjusting the pH value to 9-11 with ammonia water, the solution was cooled and filtered to obtain self-emulsifying epoxy modified acrylic emulsion A.

[0076] Example 3:

[0077] In 100 parts of water, 40 parts of butyl acrylate, 10 parts of methyl methacrylate and 1.5 parts of emulsifier DNS-86 were mixed uniformly, heated to 80°C, and 0.2 parts of potassium persulfate and 5.5 parts of epoxy solution were added dropwise. The temperature was kept at 80°C and stirring was continued for 2h. After adjusting the pH value to 9-11 with ammonia water, the solution was cooled and filtered to obtain self-emulsifying epoxy modified acrylic emulsion A.

[0078] 100 parts of the self-emulsifying epoxy modified acrylic emulsion A prepared in Example 1 was heated to 80℃, and then dispersed at a high speed using a homogenizer at a speed of 8000 rpm. Then, 100 parts of maleic anhydride modified asphalt at 175℃ was slowly poured in, and dispersed for 15 min to obtain modified emulsified asphalt.

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

[0080] Example 4:

[0081] The base asphalt was heated to 175℃, and then 8% of maleic anhydride modified SBS resin by weight of the base asphalt was added and stirred for 2 h 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] 45 parts of butyl acrylate, 5 parts of methyl methacrylate, and 1.5 parts of emulsifier ANPEO10 were added to water and mixed uniformly to 100 parts, heated to 80℃, and then 0.2 parts of potassium persulfate and 5.5 parts of the epoxy solution were added dropwise. The temperature was maintained at 80℃ and the stirring was continued for 2 h. After the pH value was adjusted to 9-11 using ammonia water, the mixture was cooled and filtered to obtain self-emulsifying epoxy modified acrylic emulsion B.

[0084] 100 parts of the self-emulsifying epoxy modified acrylic emulsion B prepared in Example 4 was heated to 80℃, and then dispersed at a high speed using a homogenizer at a speed of 6000 rpm. Then, 150 parts of maleic anhydride modified asphalt at 165℃ was slowly poured in, and dispersed for 15 min to obtain modified emulsified asphalt.

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

[0086] Example 5:

[0087] The base asphalt was heated to 165℃, and then 6% of maleic anhydride modified resin by weight of the base asphalt was added and stirred for 2 h to obtain maleic anhydride modified asphalt.

[0088] 100 parts of the self-emulsifying epoxy modified acrylic emulsion B prepared in Example 4 was heated to 80℃, and then dispersed at a high speed using a homogenizer at a speed of 6000 rpm. Then, 150 parts of maleic anhydride modified asphalt at 165℃ was slowly poured in, and dispersed for 15 min 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 part of preservative, 2 parts of thickening agent were mixed and stirred uniformly to prepare water-based asphalt waterproof coating 5.

[0090] Comparative Example 1:

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

[0092] Comparative Example 2:

[0093] 100 parts of base emulsified asphalt, 100 parts of commercially available acrylic emulsion, 5 parts of glass fiber, 0.3 parts of pH regulator, 0.1 part of preservative, 1 part of thickening agent were mixed and stirred uniformly to prepare water-based asphalt waterproof coating 2'.

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

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

[0096]

[0097] As can be seen from the relevant data in Table 1, the tensile strength, bonding strength, roll composite adhesion, bonding strength retention rate after immersion, tensile strength after immersion, and peel strength with the roll of Examples 1-5 are all much higher than those of Comparative Examples 1 and 2, and the water absorption rate of Examples 1-5 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 application has better water resistance, lower water absorption rate, and better mechanical properties compared to the comparative examples. In addition, the elongation at break of Examples 1-5 is neither too high like Comparative Example 1, making the material too soft, nor too low like Comparative Example 2, making the material too hard, indicating that the water-based asphalt coating of Examples 1-5 is more suitable for bonding with concrete and other substrates, and the elongation at break is maintained at an appropriate level, which can maintain the stability and integrity of the structure.

[0098] The above specific examples further illustrate the purpose, technical solutions and advantages of the present application. It should be understood that the above description is only a specific embodiment of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. An aqueous asphalt coating, comprising: a mixture of A component and B component, wherein A component: 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; B component: self-emulsifying epoxy modified acrylic emulsion, which is an emulsion formed by emulsifier grafted acrylic polymer and epoxy resin; the maleic anhydride modified resin comprises maleic anhydride modified SBS resin.

2. The aqueous asphalt coating according to claim 1, further comprising: C component: graphene modified glass fiber.

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

10.

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

5. A preparation method of the aqueous asphalt coating according to any one of claims 1-4, comprising: first mixing and heating base asphalt and maleic anhydride modified resin to obtain A component; adding acrylic monomer and emulsifier to water respectively, and second mixing and heating with epoxy solution under the action of initiator to obtain B component; mixing and heating dispersing A component and B component to obtain the aqueous asphalt coating.

6. The preparation method according to claim 5, further comprising: mixing and stirring the aqueous asphalt coating with graphene modified glass fiber to obtain the finished product of aqueous asphalt coating.

7. The production method according to claim 5, wherein The temperature of the first mixing and heating is 155-175℃, and the time is 1.5-2.5h; The temperature of the second mixing and heating is 75-85℃, and the time is 1.5-2.5h; The initiator comprises at least one of potassium persulfate and ammonium persulfate; The emulsifier comprises at least one of allyloxy nonyl phenol polyoxyethylene (10) ether ammonium sulfate, allyloxy nonyl phenol polyoxyethylene ether, and sodium allyloxy hydroxypropyl sulfonate; The acrylic monomer comprises 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 comprises at least one of E-12 type epoxy resin, E-20 type epoxy resin, and E-44 type epoxy resin; 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, based on the total mass of 100 parts of the acrylic monomer, the emulsifier, and the water.

8. The production method according to claim 5, wherein The heating and dispersing comprises adding maleic anhydride modified asphalt at 155-175℃ to self-emulsifying epoxy modified acrylic emulsion at 75-85℃, and the dispersing time is 14-16 min and the dispersing rotation speed is 5000-8000 rpm.

9. The production method according to claim 6, wherein The graphene modified glass fiber is prepared by the following steps: dispersing and mixing graphene and silane coupling agent in hydrogen peroxide, and then adding glass fiber to make graphene adsorb on the surface of the glass fiber to obtain the graphene modified glass fiber; The silane coupling agent comprises at least one of vinyl coupling agent, amino coupling agent, and epoxy coupling agent.

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

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