Water-borne epoxy resin modified emulsified asphalt and preparation method thereof

Abstract

The invention relates to the technical field of asphalt compositions, in particular to waterborne epoxy resin modified emulsified asphalt and a preparation method thereof.The waterborne epoxy resin modified emulsified asphalt is formed by mixing and curing a two-component system, the two-component system comprises a component A and a component B. The component A comprises emulsified asphalt, epoxy resin and ketimine, and the component B comprises emulsified asphalt and an amine curing agent. The mass ratio of the component A to the component B is 1: (0.8-1.2), the component A is prepared from, by weight, 190-210 parts of emulsified asphalt, 45-55 parts of epoxy resin and 25-35 parts of ketimine, and the component B is prepared from, by weight, 210-230 parts of emulsified asphalt and 25-35 parts of amine curing agent.By adjusting the proportion of the component A to the component B, the strength and ductility of the material are remarkably improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of asphalt composition, in particular to a water-based epoxy resin modified emulsified asphalt and a preparation method thereof. BACKGROUND

[0002] Emulsified asphalt is a dispersed emulsion of asphalt in water phase under the action of emulsifier and machinery, which has the advantages of normal temperature construction, environmental protection and energy saving, and is widely used in tack coat, penetration coat, seal coat and bridge deck waterproofing of road engineering. However, ordinary emulsified asphalt has defects such as insufficient high-temperature stability, low-temperature cracking, poor water resistance and low mechanical strength, which restricts its application in heavy traffic and important bridge engineering. In order to improve the performance, polymer latex (such as SBR, SBS) is often used for modification, but such method has problems such as poor compatibility, easy phase separation and difficult to balance high and low temperature performance. Epoxy resin has high strength, high adhesion and excellent chemical resistance, and its use in asphalt modification can significantly improve the high-temperature deformation resistance, mechanical strength and fatigue resistance of asphalt.

[0003] The patent with publication number CN110330801A discloses a preparation method of epoxy resin modified emulsified asphalt, which comprises mixing epoxy resin with heated base asphalt and then emulsifying according to the conventional asphalt emulsification method. The epoxy resin can be uniformly distributed in the asphalt, which can effectively reduce the particle size of the emulsion, and is beneficial to the storage stability of the emulsion, the uniformity of film formation and the uniform coating of aggregate during mixing process.

[0004] However, the traditional epoxy modified asphalt process usually relies on hot mixing and curing, which needs to be constructed under high temperature conditions, has high energy consumption, and the activation period is difficult to accurately control, which is difficult to effectively compatible with the normal temperature construction characteristics of emulsified asphalt. In addition, the epoxy modified asphalt prepared by the traditional method has limited improvement in interlayer adhesion, which is difficult to fully exert the high strength characteristics of epoxy resin, resulting in interlayer slip, peeling and other diseases under heavy load or complex climate conditions, which affects the overall performance and service life of the pavement. SUMMARY

[0005] In order to solve the problems mentioned in the background art, the present application provides a water-based epoxy resin modified emulsified asphalt and a preparation method thereof.

[0006] In order to achieve the above purpose, the technical scheme adopted by the present application is as follows: A water-based epoxy resin modified emulsified asphalt, characterized in that it is formed by mixing and curing a two-component system, the two-component system comprising component A and component B, component A comprising emulsified asphalt, epoxy resin and ketimine, component B comprising emulsified asphalt and amine curing agent, and the mass ratio of component A to component B being 1:(0.8-1.2).

[0007] Further, the component A comprises: emulsified asphalt 190-210 parts by weight, epoxy resin 45-55 parts by weight and ketimine 25-35 parts by weight, and the component B comprises: emulsified asphalt 210-230 parts by weight and amine curing agent 25-35 parts by weight.

[0008] Further, the epoxy resin is bisphenol A type epoxy resin, and the amine curing agent is ammonium salt formed by acid treatment of polyether amine.

[0009] Further, the polyether amine ammonium salt is prepared by reacting polyether amine with glacial acetic acid at a molar ratio of 1:1.05.

[0010] According to another aspect of the present application, a preparation method of the above-mentioned waterborne epoxy resin modified emulsified asphalt is provided, comprising the following steps: S1, mixing emulsified asphalt, epoxy resin and ketimine by high-speed shearing to obtain component A; S2, mixing emulsified asphalt and amine curing agent by low-speed shearing to obtain component B; S3, mixing component A and component B in proportion and stirring until curing.

[0011] Further, the rotating speed of high-speed shearing in step S1 is 3000-5000 rpm, and the mixing time is 15-30 min.

[0012] Further, the rotating speed of low-speed shearing in step S2 is 200-400 rpm, and the mixing time is 15-25 min.

[0013] Further, the mixing in step S3 is carried out at room temperature, and the mixing system appears gel in 48-65 min and completely cures in 113-160 min by mechanical stirring or manual stirring.

[0014] The beneficial effects of the present application are: 1. By adopting the design of two-component (A / B component) system, the epoxy resin and polyether amine are placed in two components, which helps to keep each component stable during storage and avoid the early reaction of the epoxy resin curing system, thereby improving the storage stability of the product. When applied, the two components can be mixed at room temperature to initiate the curing process, so that the epoxy resin modification technology can adapt to the normal temperature construction characteristics of emulsified asphalt, which is beneficial to simplify the process and reduce energy consumption.

[0015] 2. By introducing ketimine, which can keep chemical inert before mixing with component B. When the two components are mixed, the ketimine can gradually decompose and release active amine during the water evaporation in the construction process, which can then crosslink with epoxy resin to provide suitable workable time for the mixture, improve the adaptability to the construction rhythm, and help to form a uniform curing network to improve the mechanical properties of the final product.

[0016] 3. Amine curing agent ammonium salt generated by acid treatment is used in component B, which aims to adjust the pH value of the curing agent to match the acidic environment of cationic emulsified asphalt (pH value 2-4). If alkaline polyether amine is directly added, it will cause neutralization reaction with emulsified asphalt to cause demulsification, while pre-treatment in the form of ammonium salt avoids this risk and ensures the stability of the emulsion. At the same time, the hydrophilicity of ammonium salt is more compatible with the aqueous medium of emulsified asphalt, which helps to reduce the risk of adversely affecting the stability of the emulsion during stirring and dispersion, and promotes the uniform distribution of the curing agent in the system to support the performance of the cured product. DETAILED DESCRIPTION

[0017] The technical solutions of the present application will be described clearly and completely below in combination with the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0018] Unless otherwise specified, the raw materials used in the present application are all obtained from market-purchased conventional products.

[0019] Example 1 A preparation method of water-based epoxy resin modified emulsified asphalt, comprising the following steps: S1. In a stainless steel container, 190 parts of emulsified asphalt, 45 parts of liquid bisphenol A epoxy resin, and 25 parts of ketimine were added, and high-speed shearing blending was carried out at 3000 rpm for 15 min in a blender to obtain component A; S2. Polyether amine was blended with glacial acetic acid with a molar ratio of 1:1.05 for acid treatment to obtain 25 parts of polyether amine ammonium salt; S3. In a stainless steel container, 210 parts of emulsified asphalt and 25 parts of polyether amine ammonium salt were added, and low-speed shearing stirring was carried out at 200 rpm for 15 min in a blender to obtain component B; S4. 55.5 parts of component A were mixed with 44.5 parts of component B, and a glass rod was used for stirring until curing to obtain water-based epoxy resin modified emulsified asphalt, denoted as Op08.

[0020] Example 2 A preparation method of a water-based epoxy resin modified emulsified asphalt, comprising the following steps: S1, 196 parts of emulsified asphalt, 48 parts of liquid bisphenol A epoxy resin, 27 parts of ketimine were added in a stainless steel container, and high-speed shearing blending was carried out under the stirring machine 4000 rpm for 20 min to obtain component A; S2, the polyether amine was blended with glacial acetic acid with a molar ratio of 1:1.05, acid treatment was carried out, and 29 parts of polyether amine ammonium salt were obtained; S3, 215 parts of emulsified asphalt and 29 parts of polyether amine ammonium salt were added in a stainless steel container, and low-speed shearing stirring was carried out under the stirring machine at 300 rpm for 20 min to obtain component B; S4, 52.6 parts of component A and 47.4 parts of component B were mixed, and glass rod stirring was carried out until solidification to obtain a water-based epoxy resin modified emulsified asphalt, denoted as Op09.

[0021] Example 3 A preparation method of a water-based epoxy resin modified emulsified asphalt, comprising the following steps: S1, 200 parts of emulsified asphalt, 50 parts of liquid bisphenol A epoxy resin, 30 parts of ketimine were added in a stainless steel container, and high-speed shearing blending was carried out under the stirring machine 4000 rpm for 25 min to obtain component A; S2, the polyether amine was blended with glacial acetic acid with a molar ratio of 1:05, acid treatment was carried out, and 30 parts of polyether amine ammonium salt were obtained; S3, 220 parts of emulsified asphalt and 30 parts of polyether amine ammonium salt were added in a stainless steel container, and low-speed shearing stirring was carried out under the stirring machine at 300 rpm for 20 min to obtain component B; S4, 50 parts of component A and 50 parts of component B were mixed, and glass rod stirring was carried out until solidification to obtain a water-based epoxy resin modified emulsified asphalt, denoted as Op10.

[0022] Example 4 A preparation method of a water-based epoxy resin modified emulsified asphalt, comprising the following steps: S1, 205 parts of emulsified asphalt, 51 parts of liquid bisphenol A epoxy resin, 31 parts of ketimine were added in a stainless steel container, and high-speed shearing blending was carried out under the stirring machine 4000 rpm for 25 min to obtain component A; S2, the polyether amine was blended with glacial acetic acid with a molar ratio of 1:1.05, acid treatment was carried out, and 34 parts of polyether amine ammonium salt were obtained; S3, 218 parts of emulsified asphalt and 34 parts of polyether amine ammonium salt were added in a stainless steel container, and low-speed shearing stirring was carried out under the stirring machine at 300 rpm for 20 min to obtain component B; S4, 45.5 parts of component A and 54.5 parts of component B were mixed, stirred with a glass rod until solidification, to obtain a water-based epoxy resin modified emulsified asphalt, denoted as Op12.

[0023] Example 5 A method for preparing a water-based epoxy resin modified emulsified asphalt, comprising the following steps: S1, in a stainless steel container, 210 parts of emulsified asphalt, 55 parts of liquid bisphenol A epoxy resin, 35 parts of ketimine were added, and high-speed shearing blending was carried out at 5000 rpm for 30 min to obtain component A; S2, the polyether amine was blended with glacial acetic acid with a molar ratio of 1:1.05, and acid treatment was carried out to obtain 35 parts of polyether amine ammonium salt; S3, in a stainless steel container, 230 parts of emulsified asphalt, 35 parts of polyether amine ammonium salt were added, and low-speed shearing stirring was carried out at 400 rpm for 20 min under a stirrer to obtain component B; S4, 45.5 parts of component A and 54.5 parts of component B were mixed, stirred with a glass rod until solidification, to obtain a water-based epoxy resin modified emulsified asphalt, denoted as Op12.

[0024] The gel time and complete curing time of examples 1-6 were observed, and the strength test of the cured asphalt was carried out. According to T604-2011 asphalt penetration test, T605-2011 asphalt ductility test and ASTM E1356-08 "standard test method for determining glass transition temperature by differential scanning calorimetry" in JTC 3410-2025 "highway engineering asphalt and asphalt mixture test procedures", the ductility, penetration and glass transition temperature were tested according to the standard method, and the results are shown in table 1: Table 1. Performance test results of modified emulsified asphalt

[0025] As can be seen from table 1, compared with conventional emulsified asphalt, the water-based epoxy resin modified emulsified asphalt (Op08-Op12) prepared in examples 1-5 shows significant differences in many performance indicators. The modified emulsified asphalt has different degrees of improvement in ductility, penetration and glass transition temperature, and the gel time and complete curing time also change.

[0026] As the example number increases (from Op08 to Op12), both the gel time and the complete curing time gradually shorten. During the preparation process, the amount of liquid bisphenol A epoxy resin, ketimine and polyether amine ammonium salt and the process parameters are different. Liquid bisphenol A epoxy resin is an important component of the formation of cross-linked structure, the increase of its amount makes the increase of the epoxy groups in the system that can participate in the reaction, and the cross-linking reaction is more likely to occur, thus accelerating the gel and curing process. At the same time, the increase of stirring speed and the extension of blending time are beneficial to the full mixing of components, making the contact between reactants more uniform and sufficient, further promoting the cross-linking reaction, resulting in the shortening of the gel time and the complete curing time.

[0027] The ductility of modified emulsified asphalt is significantly higher than that of conventional emulsified asphalt, and gradually increases from Op08 to Op12. The addition of waterborne epoxy resin forms a three-dimensional network cross-linked structure in asphalt. This cross-linked structure can effectively limit the flow of asphalt molecules, and can better transmit stress when stretched by external force, so that the asphalt can withstand greater deformation before breaking, thereby improving the ductility. With the increase of the amount of modified components such as epoxy resin and the optimization of reaction conditions in the examples, the cross-linked structure is more perfect and dense, and the binding effect on asphalt molecules is enhanced, so the ductility gradually increases.

[0028] The penetration of modified emulsified asphalt is lower than that of conventional emulsified asphalt, and the change of penetration between Op08-Op12 is relatively small. Penetration reflects the hardness and consistency of asphalt. After modification by waterborne epoxy resin, the cross-linked structure formed enhances the intermolecular forces of asphalt, and the movement of molecular chains is restricted, so the asphalt becomes hard, and therefore the penetration decreases at the same temperature. Because the influence of the amount of modified components and process parameters in each example on the cross-linked structure is relatively close, the change of penetration is not large.

[0029] The glass transition temperature of modified emulsified asphalt is higher than that of conventional emulsified asphalt, and gradually increases from Op08 to Op12. Glass transition temperature is the temperature at which asphalt changes from glassy state to high-elastic state. After modification by waterborne epoxy resin, the formation of cross-linked structure restricts the movement of asphalt molecules, so the asphalt shows high hardness and brittleness at a lower temperature, and therefore the glass transition temperature increases. With the increase of the amount of modified components and the optimization of reaction conditions, the cross-linking degree increases, and the restriction on molecular movement is enhanced, so the glass transition temperature further increases.

[0030] In summary, the waterborne epoxy resin modified emulsified asphalt prepared in Examples 1-5 by adjusting the amount of liquid bisphenol A epoxy resin, ketimine and polyether amine ammonium salt, and the stirring speed, blending time and other process parameters, has better performance than conventional emulsified asphalt in terms of gel time, complete curing time, ductility, penetration and glass transition temperature. With the optimization of the amount of modified components and reaction conditions, the curing speed of the modified emulsified asphalt is accelerated, the mechanical properties are improved, and the hardness and brittleness are increased. These improvements in performance make the waterborne epoxy resin modified emulsified asphalt have better performance and wider application prospects in practical applications.

[0031] In the description of the specification, the description referring to the terms "embodiment", "each embodiment" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or preparation example are included in at least one embodiment of the present application. In the present specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment. Furthermore, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments in a suitable manner.

[0032] The above description is only the preferred specific implementation of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art, according to the technical solution and the inventive concept of the present application, makes equivalent replacement or change within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. An aqueous epoxy resin-modified emulsified asphalt, characterized by, The present application relates to a two-component system for curing asphalt, which comprises component A and component B. The component A comprises emulsified asphalt, epoxy resin and ketimine; The component B comprises emulsified asphalt and amine curing agent; The mass ratio of component A to component B is 1:(0.8-1.2).

2. The aqueous epoxy-modified emulsified asphalt according to claim 1, characterized by, The component A comprises, in parts by weight, emulsified asphalt 190-210, epoxy resin 45-55 and ketimine 25-35; The component B comprises emulsified asphalt 210-230 and amine curing agent 25-35.

3. The aqueous epoxy-modified emulsified asphalt according to claim 1, characterized by, The epoxy resin is bisphenol A type epoxy resin; The amine curing agent is ammonium salt formed by acid treatment of polyether amine.

4. The aqueous epoxy-modified emulsified asphalt according to claim 3, characterized by, The polyether amine ammonium salt is prepared by reacting polyether amine with glacial acetic acid at a molar ratio of 1:1.

05.

5. A process for the preparation of a waterborne epoxy resin modified emulsified bitumen as claimed in any one of claims 1 to 4, characterized in that, The present application further relates to a preparation method of the two-component system for curing asphalt, which comprises the following steps: S1, mixing emulsified asphalt, epoxy resin and ketimine by high-speed shearing to obtain component A; S2, mixing emulsified asphalt and amine curing agent by low-speed shearing to obtain component B; S3, mixing component A and component B in proportion and stirring until curing.

6. The preparation method according to claim 5, characterized in that, The rotation speed of high-speed shearing in step S1 is 3000-5000 rpm, and the mixing time is 15-30 min.

7. The preparation method according to claim 5, characterized in that, The rotation speed of low-speed shearing in step S2 is 200-400 rpm, and the mixing time is 15-25 min.

8. The preparation method according to claim 5, characterized in that, The mixing in step S3 is carried out at room temperature by mechanical stirring or manual stirring, and the system after mixing appears gel in 48-65 min and completely cures in 113-160 min.

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