CN119979007B

CN119979007B - Water-based asphalt coating, preparation method thereof and composite waterproof structure

Info

Publication number: CN119979007B
Application number: CN202510060336.5A
Authority: CN
Inventors: 陈晓文; 于猛; 罗伟新; 郝宁; 陈龙; 周骁琛
Original assignee: Beijing Oriental Yuhong Waterproof Technology Co Ltd
Current assignee: Beijing Oriental Yuhong Waterproof Technology Co Ltd
Priority date: 2025-01-15
Filing date: 2025-01-15
Publication date: 2025-11-07
Anticipated expiration: 2045-01-15
Also published as: CN119979007A

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, wherein the component A is maleic anhydride modified asphalt which is a blend of matrix asphalt and maleic anhydride modified resin, the mass of the maleic anhydride modified resin is 3-10% of that of the matrix asphalt, and the component B is self-emulsifying epoxy modified acrylic emulsion which is emulsion formed by an acrylic polymer grafted by an emulsifier and epoxy resin. The B component has self-emulsifying property, so that the B component can be dispersed in water, epoxy groups in the B component can be subjected to chemical reaction with anhydride groups in the A component, a stable cross-linked structure is formed in the asphalt coating, and the water-based asphalt coating has better water resistance after drying and better performance.

Description

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

Technical Field

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

Background

With the increase of waterproof demands of building engineering and municipal engineering, the composite waterproof structure of the coating and coiled material has wider application space. The asphalt waterproof coating has good compatibility with asphalt coiled materials, and can be widely applied to a composite waterproof system consisting of the asphalt coiled materials and the coating and the coiled materials.

The traditional water-based asphalt paint adopts rubber emulsion or SBS (styrene-butadiene-styrene) to modify asphalt, but has the problems of poor waterproof effect and poor adhesion with a base layer.

Disclosure of Invention

In view of the above, the present invention provides an aqueous asphalt coating material, a method for preparing the same, and a composite waterproof structure for at least partially solving at least one of the above-mentioned technical problems.

According to an embodiment of one aspect of the invention, a water-based asphalt coating is provided, which comprises a mixture of a component A and a component B, wherein the component A is maleic anhydride modified asphalt which is a blend of matrix asphalt and maleic anhydride modified resin, the mass of the maleic anhydride modified resin is 3-10% of that of the matrix asphalt, the component B is self-emulsifying epoxy modified acrylic emulsion which is emulsion formed by an emulsifier grafted acrylic polymer and epoxy resin, and the maleic anhydride modified resin comprises maleic anhydride modified SBS resin.

According to the embodiment of the invention, the water-based asphalt coating also comprises a component C, namely graphene modified glass fiber.

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

According to the embodiment of the invention, the mass of the component C is 1-8% of that of the water-based asphalt paint.

According to another embodiment of the invention, the preparation method of the water-based asphalt paint comprises the steps of carrying out first mixing heating on matrix asphalt and maleic anhydride modified resin to obtain a component A, respectively adding acrylic acid monomers and emulsifying agents into water, carrying out second mixing heating on the mixture with epoxy solution under the action of an initiator to obtain a component B, and mixing the component A and the component B, and carrying out heating dispersion to obtain the water-based asphalt paint.

According to the embodiment of the invention, the preparation method further comprises the step of mixing and stirring the water-based asphalt paint and the graphene modified glass fiber to obtain a water-based asphalt paint finished product.

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

According to the embodiment of the invention, the total of the mass parts of the acrylic acid monomer, the emulsifier and the water is 100 parts, the mass parts of the acrylic acid monomer are 40-60 parts, the mass parts of the emulsifier are 0.5-2 parts, and the mass parts of the epoxy solution are 5-10 parts.

According to the embodiment of the invention, after the second mixing and heating, the method further comprises the step of adding alkali liquor to adjust the pH value to 9-11.

According to the embodiment of the invention, the heating and dispersing comprises the steps of adding the maleic anhydride modified asphalt with the temperature of 155-175 ℃ into the self-emulsifying epoxy modified acrylic emulsion with the temperature of 75-85 ℃, wherein the dispersing time is 14-16 min, and the dispersing rotating speed is 5000-8000 rpm.

According to the embodiment of the invention, the graphene modified glass fiber is prepared by dispersing and mixing graphene and a silane coupling agent in hydrogen peroxide, and then adding the glass fiber to enable the graphene to be settled and adsorbed on the surface of the glass fiber, so that the graphene modified glass fiber is obtained, wherein the silane coupling agent comprises at least one of a vinyl coupling agent, an amino coupling agent and an epoxy coupling agent.

According to an embodiment of a further aspect of the present invention, there is provided a composite waterproof structure comprising an asphalt roll and a waterproof coating formed from the above-described aqueous asphalt coating.

According to the embodiment of the invention, the problems of high water absorption, poor water resistance and the like of the conventional water-based asphalt paint are solved by forming a crosslinked network in the coated film through the chemical reaction of the anhydride group in the component A and the epoxy group in the component B. The water-based asphalt coating has the characteristics of low water absorption, good water resistance and strong water resistance after being cured and molded, and has better bonding effect and mechanical property compared with the traditional product.

Compared with the oily asphalt paint in the related art, the water-based asphalt paint provided by the invention has lower volatile organic content and is more environment-friendly in application.

Drawings

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

FIG. 1 shows a flow chart of a method of preparing an aqueous asphalt coating.

Detailed Description

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. It should be understood that the description is only illustrative and is not intended to limit the scope of the invention. In the following detailed description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the embodiments of the invention. It may be evident, however, that one or more embodiments may be practiced without these specific details. In addition, in the following description, descriptions of well-known structures and techniques are omitted so as not to unnecessarily obscure the present invention.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "comprising" as used herein indicates the presence of a feature, step, operation, but does not preclude the presence or addition of one or more other features.

Where a convention analogous to "at least one of A, B and C, etc." is used, in general such a convention should be interpreted in accordance with the meaning of one of skill in the art having generally understood the convention (e.g., "a system having at least one of A, B and C" would include, but not be limited to, systems having a alone, B alone, C alone, a and B together, a and C together, B and C together, and/or A, B, C together, etc.). Where a formulation similar to at least one of "A, B or C, etc." is used, in general such a formulation should be interpreted in accordance with the ordinary understanding of one skilled in the art (e.g. "a system with at least one of A, B or C" would include but not be limited to systems with a alone, B alone, C alone, a and B together, a and C together, B and C together, and/or A, B, C together, etc.).

The traditional water-based asphalt paint has the problems of poor waterproof effect, poor water resistance, weak bonding capability and the like. In the process of realizing the conception of the invention, it is found that by using the acrylic emulsion as a modifier and uniformly dispersing the acrylic emulsion into the asphalt emulsion in a physical way, a novel stable heterogeneous system can be constructed, the rheological property, viscoelasticity and ductility of asphalt can be changed, and the adhesive strength and the water impermeability of the product are improved. However, since the acrylic emulsion contains many hydrophilic groups such as carboxyl groups and ester groups, the water resistance of the waterproof coating film after curing and molding is lowered, and problems such as swelling, air bubbles and falling easily occur.

In order to solve the above problems, the inventors modified acrylic with an epoxy resin in hopes of reducing the content of hydrophilic groups in an acrylic emulsion. However, the epoxy resin and asphalt have poor compatibility, so that the epoxy modified acrylic emulsion is isolated in the water-based asphalt coating, the storage stability is poor, and the modification effect is relatively general. Meanwhile, a large amount of emulsifying agent (with hydrophilic groups) is added in the asphalt emulsification process, so that the mechanical property and the water resistance of the prepared water-based asphalt coating are low.

In view of the above, the invention uses maleic anhydride modified asphalt as the A component, uses self-emulsifying epoxy modified acrylic emulsion as the B component, and utilizes the chemical reaction between anhydride groups and epoxy groups to form a crosslinked structure in the asphalt coating, thereby improving the water resistance of the water-based asphalt coating, reducing the water absorption rate, and improving the adhesive property and the mechanical property of the water-based asphalt coating.

Specifically, according to an embodiment of one aspect of the present invention, there is provided a water-based asphalt paint comprising: the component A is maleic anhydride modified asphalt which is a blend of matrix asphalt and maleic anhydride modified resin, wherein the mass of the maleic anhydride modified resin is 3-10% of that of the matrix asphalt; and the component B is self-emulsifying epoxy modified acrylic emulsion which is emulsion formed by an acrylic polymer grafted by an emulsifier and epoxy resin, and the maleic anhydride modified resin comprises maleic anhydride modified SBS resin.

According to the embodiment of the invention, the maleic anhydride modified asphalt is understood as being prepared by introducing maleic anhydride groups to chemically modify asphalt, wherein the modification of the maleic anhydride can enhance the compatibility of the asphalt with the B component and reduce the occurrence of segregation phenomenon. And the maleic anhydride group can interact with the epoxy group in the component B in the curing process to form a crosslinked network structure, so that the crosslinked network structure is beneficial to improving the compactness of a coating film (formed after the coating is dried), and the possibility of moisture permeation is reduced, thereby improving the water resistance of the water-based asphalt coating. In addition, the modification of the asphalt by the maleic anhydride can also improve the thermal stability and mechanical properties of the asphalt, so that the coating film is more firm and durable.

Furthermore, the self-emulsifying epoxy modified acrylic emulsion combines the characteristics of epoxy resin and acrylic ester, the epoxy resin has better adhesive force, and the acrylic ester endows the water-based asphalt paint with better flexibility and weather resistance. When the component A and the component B are combined, the formed water-based asphalt coating can be rapidly formed into a film after construction, and is further crosslinked and hardened in the photo-curing or natural drying process to form a compact protective layer.

It should be noted that the crosslinked network structure formed between the A component and the B component is not easily damaged by hydrolysis, and stable performance can be maintained even in a humid environment for a long period of time. The coating film formed after curing is thick and uniform, almost has no obvious defects or holes, and greatly limits the water permeation path. So that the water-based asphalt paint realizes excellent water resistance and extremely low water absorption and prolongs the service life.

The mass of the maleic anhydride modified resin is 3-10% of that of the matrix asphalt, and may be 3%, 5%, 7%, 9% or 10%, for example. The proportion of the two is adjusted in the range, so that the matrix asphalt and the SBS resin modified by the maleic anhydride are fully mixed, the maleic anhydride and polar groups in the matrix asphalt form interaction, the compatibility between the matrix asphalt and the SBS resin is improved, and meanwhile, the performance of the matrix asphalt is not affected by excessive addition.

According to the embodiment of the invention, the mass ratio of the component A to the component B is (8-15): 10, and can be 4:5, 1:1, 3:2 and the like. The mass ratio of the two is adjusted within the range, so that enough reaction sites are formed between the maleic anhydride group and the epoxy group, and an crosslinked structure can be fully formed. If the A component is used too much, unreacted maleic anhydride may remain, affecting the performance of the final aqueous asphalt coating, and if the B component is used too much, unnecessary side reactions may be caused by the excessive epoxy groups. In addition, the proportion helps to maintain the stability of the emulsion system and prevent the occurrence of layering or precipitation.

According to the embodiment of the invention, the water-based asphalt coating also comprises a component C, namely graphene modified glass fiber. Graphene modified glass fibers may be understood as composite materials prepared by incorporating graphene into glass fibers. The addition of the component C makes the surface of the glass fiber coarser, increases the friction force, and can improve the tensile strength and the elongation at break of the coating on the premise of not sacrificing the flexibility of the water-based asphalt coating, thereby improving the compatibility between the water-based asphalt coating and concrete, and overcoming the problems that the conventional glass fiber is easy to slip in an asphalt coating and has poor performance improvement effect. The addition of the component C improves the anti-slip performance of the coating film and the bonding performance between the coating film and the concrete base layer.

According to the embodiment of the invention, the mass of the component C is 1-8% of that of the water-based asphalt paint, for example, 1%, 2%, 3%, 4%, 5%, 6%, 7% or 8% and the like can be adopted. The addition quality of the component C is adjusted within the range, so that the mechanical property of the coating film can be obviously enhanced, and meanwhile, the good flexibility of the coating film is maintained, so that the coating film has good ductility and adhesion. If the mass of the C component is too small, the mechanical strength enhancement effect on the water-based asphalt coating is limited, and if the mass of the C component is too large, the coating film formed after curing is too rigid, the necessary flexibility is lost, and the application effect of the coating film on a curved or telescopic surface is affected.

According to another aspect of the present invention, there is provided a method for preparing a water-based asphalt paint as described above, fig. 1 shows a flowchart of a method for preparing a water-based asphalt paint, and the method includes operations S101 to S103 as shown in fig. 1.

In operation S101, a matrix asphalt and a maleic anhydride-modified resin are subjected to first mixing heating to obtain a component a.

The SBS (styrene-butadiene-styrene) resin is directly mixed with the matrix asphalt, the compatibility between the SBS resin and the matrix asphalt is poor, and the SBS resin is modified by using maleic anhydride, so that the compatibility between the matrix asphalt and the SBS resin is better, because maleic anhydride groups can interact with polar components in the matrix asphalt, so that the combination of the matrix asphalt and the matrix asphalt is tighter, and the mixture further reacts with the component B, thereby being beneficial to improving the mechanical property and the durability of the water-based asphalt coating.

In operation S102, the acrylic acid monomer and the emulsifier are respectively added into water, and are subjected to second mixing heating with the epoxy solution under the action of the initiator, so that the component B is obtained.

The emulsifier is preferably a polymeric emulsifier, so that it can undergo a grafting reaction with the acrylic monomer, and under the action of the initiator, an epoxy modified acrylic emulsion having self-emulsifying properties can be produced. The emulsifier has the characteristics of hydrophilic at one end and oleophylic at one end, and after self-emulsification is formed, the water-based asphalt paint can have an emulsifier effect, and the non-hydrophilic oily material can be uniformly dispersed in a water matrix. The self-emulsifying component B is formed, and an emulsifier is not required to be additionally added, so that the introduction of hydrophilic groups is reduced, and the prepared water-based asphalt coating has good water resistance and mechanical properties.

In operation S103, the a component and the B component are mixed and dispersed by heating, to obtain the aqueous asphalt paint.

The heating dispersion is beneficial to ensuring that the mixture between the component A and the component B is more uniform, and the interaction between the maleic anhydride group and the epoxy group is more sufficient, so that a compact crosslinked network structure is formed, the water resistance of the cured coating film is improved, and the mechanical property of the water-based asphalt coating is improved.

According to the embodiment of the invention, through S101-S103, the interaction of the maleic anhydride group and the epoxy group is utilized to generate an ester bond, a compact cross-linked network structure is formed in the water-based asphalt coating, the water resistance of the water-based asphalt coating is improved, and the problems of high water absorption, poor water resistance and the like of the conventional water-based asphalt coating are solved. And the emulsifier is grafted on the component B to emulsify the water-based asphalt paint, so that the water-based asphalt paint is in a dispersed suspension state in water, and no additional emulsifier is required to be added in the preparation process, so that the water resistance of the water-based asphalt paint is further improved.

According to the embodiment of the invention, the preparation method can further comprise the step of mixing and stirring the water-based asphalt paint and the graphene modified glass fiber to obtain a water-based asphalt paint finished product.

According to the embodiment of the invention, graphene is added into the glass fiber, so that in-situ sedimentation adsorption of graphene on the surface of the glass fiber can be realized, the water-based asphalt coating finished product has good compatibility with base materials such as concrete, the conditions that the conventional glass fiber is easy to slip in the water-based asphalt coating and has poor performance improvement effect on the water-based asphalt coating are overcome, and the graphene is modified, so that the anti-slip performance of a coating film can be improved, the bonding performance with the base materials such as concrete and the like is improved, and the service life of the coating film is prolonged.

Preferably, the length of the glass fibers may be less than 1mm. The reason is that the excessively long glass fiber can cause aggregation of the glass fiber, the dispersion effect is poor, and the improvement of the mechanical property and the anti-slip effect of the water-based asphalt coating is limited.

According to an embodiment of the present invention, the temperature of the first mixed heating is 155 to 175 ℃, for example, 155 ℃, 160 ℃, 165 ℃, 170 ℃ or 175 ℃, and the time is 1.5 to 2.5 hours, for example, 1.5 hours, 2 hours or 2.5 hours, preferably 2 hours. The temperature and time of the first mixing heating are adjusted within the above ranges to help to thoroughly mix the matrix asphalt with the maleic anhydride modified resin, so that an interaction is formed between the maleic anhydride and the polar groups in the matrix asphalt, and the compatibility between the matrix asphalt and the SBS resin is improved.

According to an embodiment of the present invention, the temperature of the second mixed heating is 75 to 85 ℃, for example, 75 ℃, 78 ℃, 82 ℃ or 85 ℃, and the time is 1.5 to 2.5 hours, for example, 1.5 hours, 2 hours or 2.5 hours, preferably 2 hours. The temperature and time of the second mixing heating are adjusted within the above ranges, so that the free radical polymerization reaction of the acrylic monomer under the action of the initiator can be promoted, and the proper temperature can be used for ensuring that the acrylic monomer is fully converted into a polymerization state and reducing the existence of unreacted monomers. The initiator comprises at least one of potassium persulfate and ammonium persulfate. Potassium persulfate and ammonium persulfate belong to strong oxidants, and are decomposed under the heating condition to generate sulfate radical which can supply double bonds in acrylic acid monomers to initiate chain growth reaction to generate self-emulsifying epoxy modified acrylic acid emulsion. The emulsifier comprises at least one of ammonium allyloxy nonylphenol polyoxyethylene (10) ether sulfate (DNS-86), allyloxy Nonylphenol Polyoxyethylene Ether (ANPEO), and sodium allyloxy hydroxypropyl sulfonate (HAPS). The emulsifier has a good emulsifying effect, can effectively prevent aggregation of particles in acrylic emulsion, and keeps good fluidity.

According to the embodiment of the invention, after the second mixing heating, the method further comprises adding alkali liquor to adjust the pH value to 9-11, for example, 9, 10 or 11. The alkali liquor can be ammonia water for example, is adjusted to be in an alkaline state, and is favorable for keeping the self-emulsifying epoxy modified acrylic emulsion in an ionization state, so that the self-emulsifying epoxy modified acrylic emulsion is stable, and aggregation of emulsion particles is avoided. 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 the acrylic monomer during polymerization and methyl methacrylate provides low-temperature flexibility, and flexibility of the coating film is further improved after the coating film is formed later. The epoxy solution is prepared by dissolving epoxy resin in an organic solvent, wherein the epoxy resin comprises at least one of E-12 type epoxy resin, E-20 type epoxy resin and E-44 type epoxy resin. In the experimental process, the coating film formed by the water-based asphalt coating prepared from the epoxy resin has better water resistance and better mechanical property.

According to the embodiment of the invention, the mass part of the acrylic monomer is 40-60 parts, for example, 40 parts, 45 parts, 50 parts, 55 parts or 60 parts, etc., based on 100 parts of the total of the mass parts of the acrylic monomer, the emulsifier and the water. When the acrylic monomer is a mixture of butyl acrylate and methyl methacrylate, the mass part of butyl acrylate is 35 to 50 parts, for example, 35 parts, 40 parts, 45 parts or 50 parts, and the mass part of methyl methacrylate is 5 to 10 parts, for example, 5 parts, 8 parts or 10 parts. The emulsifier is 0.5-2 parts by mass, for example, 0.5 parts, 1 part, 1.5 parts or 2 parts. The emulsifier is preferably a polymeric emulsifier, which is capable of grafting onto the acrylic monomer. The epoxy solution is 5 to 10 parts by mass, and may be, 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, and may be, for example, 0.1 part, 0.2 part, 0.5 part or 1 part. The addition parts of the raw materials are respectively limited in the above ranges, so that the component B has a better emulsification effect by grafting modification under the condition of not adding other emulsifying agents, and the asphalt coating of the invention is water-based and more environment-friendly in the subsequent application.

According to an embodiment of the present invention, the heating dispersion includes adding 155-175 ℃ maleic anhydride modified asphalt to a self-emulsifying epoxy modified acrylic emulsion having a temperature of 75-85 ℃, and since the self-emulsifying epoxy modified acrylic emulsion is aqueous, the temperature is required to be adjusted below 100 ℃, whereas the maleic anhydride modified asphalt is an asphalt phase part, a relatively higher temperature is required to maintain good fluidity. Therefore, when the component A is mixed with the component B, the temperature of the component A is required to be kept between 155 ℃ and 175 ℃, so that the component A has good fluidity, and the uniformity of dispersion and mixing between the component A and the component B is facilitated. The dispersing time is 14 to 16min, for example, 14min, 15min or 16min, preferably 15min, and the dispersing speed is 5000 to 8000rpm, for example, 5000rpm, 6000rpm, 7000rpm or 8000rpm. The parameters of the heating dispersion are respectively adjusted to the above ranges, which is helpful for fully contacting the A component and the B component, and fully interacting the maleic anhydride group and the epoxy group.

According to the embodiment of the invention, the graphene modified glass fiber is prepared by dispersing and mixing graphene and a silane coupling agent in hydrogen peroxide, and then adding the glass fiber to enable the graphene to be settled and adsorbed on the surface of the glass fiber, so that the graphene modified glass fiber is obtained, wherein the silane coupling agent comprises at least one of a vinyl coupling agent, an amino coupling agent and an epoxy coupling agent. Graphene is settled and adsorbed on the surface of the glass fiber, so that the mechanical property of the glass fiber can be improved. The silane coupling agent can promote interaction between graphene and glass fiber, and enhance interfacial adhesion and compatibility. Hydrogen peroxide belongs to a strong oxidant, can carry out surface modification on graphene, introduces more oxygen-containing functional groups, and increases the hydrophilicity and the reactivity of the graphene. Through the synergistic effect of the silane coupling agent and the sedimentation adsorption of the graphene, the stable attachment of the graphene on the glass fiber is realized.

In the process of preparing the water-based asphalt paint, additives such as pH additives, preservatives and thickeners can be added according to the need. The additive is helpful for improving the stability, corrosion resistance and thickening performance of the water-based asphalt paint.

The weight portion of the water-based asphalt coating, the graphene modified glass fiber, the pH additive, the preservative and the thickener is 100 (1-8) (0.1-1) (0.1-0.5) (0.5-3).

According to the embodiment of the invention, the asphalt coiled material has good waterproof performance and can bear certain stress, and the waterproof coating covered on the asphalt coiled material is helpful for filling fine cracks and gaps of the asphalt coiled material, and is tightly combined with the asphalt coiled material to provide additional waterproof protection. In addition, the water-based asphalt paint is relatively environment-friendly, and the volatile organic compounds are less discharged in the construction process, so that the environment protection is facilitated. The composite waterproof structure not only can be used for superposing and improving the waterproof effect, but also can prolong the service life of a building and reduce the maintenance cost.

In one specific embodiment, the process for preparing the aqueous asphalt coating may comprise the steps of:

and heating the matrix asphalt to 155-175 ℃, adding the maleic anhydride modified SBS resin XIRAN to 2000, and carrying out heat preservation, stirring and mixing to obtain the maleic anhydride modified asphalt.

And pre-dissolving epoxy resin in propylene glycol methyl ether to prepare an epoxy solution with the mass concentration of 60%.

Adding 35-50 parts by weight of butyl acrylate, 5-10 parts by weight of methyl methacrylate and 0.5-2 parts by weight of a polymerization type emulsifier into 100 parts by weight of total of acrylic acid monomer, emulsifier and water, uniformly mixing to obtain 100 parts by weight of solution, heating to 80 ℃, dropwise adding 0.2 part by weight of potassium persulfate and 5-10 parts by weight of epoxy solution, keeping 80 ℃ and continuously stirring for 2 hours, regulating the pH value to 9-11 by using ammonia water, cooling and filtering to obtain the self-emulsifying epoxy modified acrylic emulsion.

Heating 100 parts of modified acrylic emulsion to 80 ℃, dispersing at a high speed by using a homogenizer at a rotating speed of 5000-8000rpm, slowly pouring 80-150 parts of maleic anhydride modified asphalt at 155-175 ℃ into the mixture, and dispersing for 15min to obtain the water-based asphalt coating.

Adding 10 parts of graphene and 2 parts of a silane coupling agent into hydrogen peroxide for ultrasonic dispersion, adding 20-40 parts of glass fiber with the length of less than 1mm, continuing ultrasonic dispersion for 2-4 hours, and drying the solution at 105 ℃ to obtain the graphene modified glass fiber.

100 Parts of water-based asphalt paint, 1-8 parts of graphene modified glass fiber, 0.1-1 part of pH regulator, 0.1-0.5 part of preservative and 0.5-3 parts of thickener are mixed and uniformly stirred to prepare a water-based asphalt paint finished product.

The invention is further illustrated by the following examples and related test experiments and results thereof. In the following detailed description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the embodiments of the invention. It may be evident, however, that one or more embodiments may be practiced without these specific details. Moreover, the details of the various embodiments below may be arbitrarily combined into other viable embodiments without conflict.

It should be noted that the following specific examples are given by way of illustration only and the scope of the present invention is not limited thereto. The chemicals and raw materials used in the examples below were either commercially available or self-made by accepted processing methods.

Example 1:

and heating the matrix asphalt to 175 ℃, adding the maleic anhydride modified SBS resin accounting for 5% of the weight of the matrix asphalt, and stirring and mixing for 2 hours to obtain the maleic anhydride modified asphalt.

The epoxy resin E12 is pre-dissolved in propylene glycol methyl ether to prepare an epoxy solution with the mass concentration of 60 percent.

Adding 40 parts of butyl acrylate, 10 parts of methyl methacrylate and 1.5 parts of emulsifier DNS-86 into water, uniformly mixing to 100 parts, heating to 80 ℃, dropwise adding 0.2 part of potassium persulfate and 5.5 parts of epoxy solution, keeping 80 ℃ and continuously stirring for 2 hours, regulating the pH value to 9-11 by using ammonia water, cooling and filtering to obtain self-emulsifying epoxy modified acrylic emulsion A.

100 Parts of self-emulsifying epoxy modified acrylic emulsion A is heated to 80 ℃ in parts by weight, dispersed at a high speed by using a homogenizer at 8000rpm, and 80 parts of 175 ℃ maleic anhydride modified asphalt is slowly poured in and dispersed for 15min to obtain modified emulsified asphalt.

Adding 10 parts of graphene and 2 parts of a silane coupling agent into hydrogen peroxide for ultrasonic dispersion, adding 40 parts of glass fiber with the length of less than 1mm, continuing ultrasonic dispersion for 4 hours, and drying the solution at 105 ℃ to obtain the graphene modified glass fiber.

100 Parts of modified emulsified asphalt, 5 parts of graphene modified glass fiber, 0.3 part of pH regulator, 0.1 part of preservative and 1 part of thickener are mixed and uniformly stirred to prepare the water-based asphalt waterproof coating 1.

Example 2:

and heating the matrix asphalt to 155 ℃, adding the maleic anhydride modified SBS resin accounting for 3% of the weight of the matrix asphalt, and stirring and mixing for 2 hours to obtain the maleic anhydride modified asphalt.

100 Parts of the self-emulsifying epoxy modified acrylic emulsion A prepared in the example 1 is heated to 80 ℃ in parts by weight, dispersed at a high speed by a homogenizer at 6000rpm, 150 parts of the maleic anhydride modified asphalt at 155 ℃ is slowly poured in, and the modified emulsified asphalt is obtained after 15 minutes of dispersion.

100 Parts of modified emulsified asphalt, 2 parts of graphene modified glass fiber prepared in example 1, 0.3 part of pH regulator, 0.1 part of preservative and 1.5 parts of thickener are mixed and uniformly stirred to prepare the water-based asphalt waterproof coating 2.

Example 3:

and heating the matrix asphalt to 175 ℃, adding the maleic anhydride modified SBS resin accounting for 10% of the weight of the matrix asphalt, and stirring and mixing for 2 hours to obtain the maleic anhydride modified asphalt.

100 Parts of self-emulsifying epoxy modified acrylic emulsion A prepared in example 1 is heated to 80 ℃ in parts by weight, dispersed at a high speed by a homogenizer at 8000rpm, and 100 parts of maleic anhydride modified asphalt at 175 ℃ is slowly poured into the mixture and dispersed for 15min to obtain modified emulsified asphalt.

100 Parts of modified emulsified asphalt, 3 parts of graphene modified glass fiber prepared in example 1, 0.3 part of pH regulator, 0.1 part of preservative and 3 parts of thickener are mixed and uniformly stirred to prepare the water-based asphalt waterproof coating 3.

Example 4:

And heating the matrix asphalt to 175 ℃, adding the maleic anhydride modified SBS resin accounting for 8% of the weight of the matrix asphalt, and stirring and mixing for 2 hours to obtain the maleic anhydride modified asphalt.

The epoxy resin E44 is pre-dissolved in propylene glycol methyl ether to prepare an epoxy solution with the mass concentration of 60 percent.

According to parts by weight, 45 parts of butyl acrylate, 5 parts of methyl methacrylate and 1.5 parts of emulsifier ANPEO are added into water to be uniformly mixed to 100 parts, the temperature is raised to 80 ℃, 0.2 part of potassium persulfate and 5.5 parts of epoxy solution are dropwise added, the temperature is kept at 80 ℃ and stirring is continued for 2 hours, the pH value is regulated to 9-11 by using ammonia water, and then the self-emulsifying epoxy modified acrylic emulsion B is obtained through cooling and filtering.

100 Parts of self-emulsifying epoxy modified acrylic emulsion B is heated to 80 ℃, dispersed at a high speed by using a homogenizer at 8000rpm, 100 parts of 175 ℃ maleic anhydride modified asphalt is slowly poured in, and the modified emulsified asphalt is obtained after 15min of dispersion.

100 Parts of modified emulsified asphalt, 8 parts of graphene modified glass fiber prepared in example 1, 0.3 part of pH regulator, 0.1 part of preservative and 2 parts of thickener are mixed and uniformly stirred to prepare the water-based asphalt waterproof coating 4.

Example 5:

and heating the matrix asphalt to 165 ℃, adding maleic anhydride modified resin accounting for 6% of the weight of the matrix asphalt, and stirring and mixing for 2 hours to obtain the maleic anhydride modified asphalt.

100 Parts of the self-emulsifying epoxy modified acrylic emulsion B prepared in the example 4 is heated to 80 ℃ in parts by weight, dispersed at a high speed by using a homogenizer at 6000rpm, 150 parts of maleic anhydride modified asphalt at 165 ℃ is slowly poured in, and the modified emulsified asphalt is obtained after 15 minutes of dispersion.

100 Parts of modified emulsified asphalt, 5 parts of graphene modified glass fiber prepared in example 1, 0.3 part of pH regulator, 0.1 part of preservative and 2 parts of thickener are mixed and uniformly stirred to prepare the water-based asphalt waterproof coating 5.

Comparative example 1:

100 parts of matrix emulsified asphalt, 100 parts of commercial acrylic emulsion, 0.3 part of pH regulator, 0.1 part of preservative and 1 part of thickener are mixed and uniformly stirred to prepare the water-based asphalt waterproof coating 1'.

Comparative example 2:

100 parts of matrix emulsified asphalt, 100 parts of commercial acrylic emulsion, 5 parts of glass fiber, 0.3 part of pH regulator, 0.1 part of preservative and 1 part of thickener are mixed by mass and uniformly stirred to prepare the water-based asphalt waterproof coating 2'.

The aqueous 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.

Table results of performance tests of the products of examples and comparative examples

As can be seen from the data in Table 1, the tensile strength, the adhesive strength, the composite holding power of the coiled material, the holding rate of the adhesive strength after soaking, the tensile strength after soaking and the peeling strength with the coiled material of examples 1-5 are all much higher than those of comparative examples 1 and 2, and the water absorption of examples 1-5 is much lower than those of comparative examples 1 and 2, which shows that the water-based asphalt coating prepared by the method of the invention has better water resistance, lower water absorption and better mechanical property than those of comparative examples. In addition, the elongation at break of examples 1-5 is neither too high as compared with example 1, so that the material is too soft, nor too low as compared with example 2, so that the material is too hard, which means that the aqueous asphalt coating of examples 1-5 is more suitable for bonding with a substrate such as concrete, and the elongation at break is maintained at a moderate level, so that the stability and integrity of the structure can be maintained.

The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the invention, and is not meant to limit the invention thereto, but to limit the invention thereto, and any modifications, equivalents, improvements and equivalents thereof may be made without departing from the spirit and principles of the invention.

Claims

1. A water-based asphalt coating, comprising:

A mixture of component A and component B, wherein

Component A: Maleic anhydride modified bitumen, which is a blend of base bitumen and maleic anhydride modified resin, wherein the mass of the maleic anhydride modified resin is 3-10% of the mass of the base bitumen;

Component B: Self-emulsifying epoxy-modified acrylic emulsion, which is an emulsion formed by emulsifier-grafted acrylic polymer 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 comprises:

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. In the water-based asphalt coating according to claim 2, 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 described in any one of claims 1 to 4, comprising:

The base bitumen and maleic anhydride modified resin were first mixed and heated to obtain component A;

Acrylic monomer and emulsifier were added to water separately, and then mixed with epoxy solution under the action of initiator and heated to obtain component B;

Component A and component B are mixed and dispersed by heating to obtain the water-based asphalt coating.

6. The preparation method according to claim 5 further includes:

The water-based asphalt coating is mixed and stirred with graphene-modified glass fiber to obtain the finished water-based asphalt coating.

7. The preparation method according to claim 5, wherein the temperature of the first mixing heating is 155~175℃ and the time is 1.5~2.5h;

The second mixing heating temperature is 75~85℃, 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 allyloxynonylphenol polyoxyethylene (10) ether ammonium sulfate, allyloxynonylphenol polyoxyethylene ether, and allyloxyhydroxypropanesulfonate sodium;

The acrylic 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 type epoxy resin, E-20 type epoxy resin, and E-44 type epoxy resin;

Based on a total mass fraction of 100 parts for acrylic monomer, emulsifier, and water, the acrylic monomer comprises 40-60 parts by mass, the emulsifier comprises 0.5-2 parts by mass, and the epoxy solution comprises 5-10 parts by mass.

8. The preparation method according to claim 5, wherein the heating and dispersion includes adding maleic anhydride modified asphalt at 155-175°C to a self-emulsifying epoxy modified acrylic emulsion at 75-85°C, with a dispersion time of 14-16 min and a dispersion 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:

Graphene and silane coupling agent are dispersed and mixed in hydrogen peroxide and then added to glass fiber, so that 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 vinyl coupling agents, amino coupling agents, and epoxy coupling agents.

10. A composite waterproof structure comprising an asphalt roll and a waterproof coating formed by any one of claims 1 to 4.