Self-supporting emulsified asphalt based on PVB (polyvinyl butyral) resin and porous silicon and preparation method of self-supporting emulsified asphalt

Abstract

The invention provides self-supporting emulsified asphalt based on PVB (polyvinyl butyral) resin and porous silicon and a preparation method of the self-supporting emulsified asphalt. According to the method, the PVB resin and the porous silicon are introduced, so that the mechanical strength, the water resistance and the stability are remarkably improved. The preparation method comprises the following specific preparation steps: preparing emulsified soap liquid, dissolving PVB resin, dispersing porous silicon, melting matrix asphalt and preparing emulsified asphalt. Porous silicon is creatively utilized to construct a stable emulsion structure, and the toughness of asphalt is enhanced through PVB resin, so that the demulsified asphalt film has excellent self-supporting capacity. The modified emulsified asphalt has wide application prospects in the fields of road engineering, waterproof materials and the like, and a new technical approach is provided for preparation of high-performance asphalt materials.

Description

Technical Field

[0001] The invention relates to the technical field of road engineering materials, and in particular to a self-supporting emulsified asphalt based on PVB resin and porous silicon and a preparation method thereof. Background Art

[0002] Asphalt is widely used in road paving, waterproof coating and building materials due to its excellent adhesion, waterproofness and durability. Among them, emulsified asphalt, as a water-based dispersion system, has been widely used in highway construction, bridge waterproofing and roof waterproofing due to its good low-temperature construction performance and strong environmental protection. However, there are still some key problems in the application of traditional emulsified asphalt, such as low mechanical strength after demulsification, easy flow and poor water resistance and stability, which are difficult to meet the needs of high-performance engineering. Therefore, the development of emulsified asphalt materials with self-supporting ability is of great practical significance.

[0003] In order to improve the mechanical properties of emulsified asphalt, researchers have tried to improve the structural stability of asphalt through polymer modification technology in recent years. Polyvinyl butyral (PVB) resin has been used to modify asphalt to enhance its mechanical strength and weather resistance due to its excellent toughness, adhesion and aging resistance. In addition, porous silicon powder, as an inorganic filler with a high specific surface area, can not only provide a reinforcing effect and improve the mechanical properties of asphalt, but also act as a solid particle stabilizer in the emulsion system to form a stable structure similar to Pickering emulsion, effectively inhibiting the aggregation and sedimentation of emulsion particles, and improving the storage stability and construction adaptability of emulsified asphalt.

[0004] Therefore, in view of the problems of low mechanical strength, high fluidity after demulsification, poor water resistance and stability of traditional emulsified asphalt, the present invention proposes a self-supporting emulsified asphalt based on PVB resin and porous silicon and a preparation method thereof. Through the polymer toughening effect of PVB resin, the reinforcing filling of porous silicon and the stabilizing effect of Pickering emulsion, the mechanical properties, structural stability and water resistance of emulsified asphalt are synergistically improved, thereby broadening its application range in road engineering, waterproof engineering and other fields. Summary of the invention

[0005] The purpose of the present invention is to provide a self-supporting emulsified asphalt based on PVB resin and porous silicon and a preparation method thereof, aiming to solve the problems of low mechanical strength, easy flow after demulsification, poor water resistance and stability of existing emulsified asphalt. By introducing PVB resin and porous silicon powder, the emulsified asphalt prepared by the present invention not only has excellent mechanical properties and weather resistance, but also can form a stable self-supporting structure after demulsification, thereby improving application performance and adaptability.

[0006] In view of the shortcomings of the prior art, the present invention proposes a self-supporting emulsified asphalt based on PVB resin and porous silicon and a preparation method thereof. PVB resin is used as a toughening modifier to improve the flexibility and aging resistance of asphalt; porous silicon powder not only acts as a reinforcing filler to improve the mechanical properties of asphalt, but also acts as a solid particle stabilizer in the emulsion system to form a stable structure similar to Pickering emulsion, effectively inhibiting the aggregation and sedimentation of emulsion particles.

[0007] The technical solution of the present invention: a self-supporting emulsified asphalt based on PVB resin and porous silicon and a preparation method thereof, comprising the following raw materials in parts by weight: 40-60 parts of base asphalt, 5-15 parts of PVB resin, 2-10 parts of porous silicon, 1-5 parts of emulsifier, 0.5-5 parts of cross-linking agent, and 20-60 parts of water.

[0008] The aforementioned self-supporting emulsified asphalt based on PVB resin and porous silicon and its preparation method are characterized in that the base asphalt is at least one of 70# or 90# petroleum asphalt.

[0009] The aforementioned self-supporting emulsified asphalt based on PVB resin and porous silicon and its preparation method are characterized in that the PVB resin is PVB recycled from automobile laminated glass or industrial-grade PVB resin.

[0010] The aforementioned self-supporting emulsified asphalt based on PVB resin and porous silicon and its preparation method are characterized in that the porous silicon is a nano-scale or micron-scale porous silicon powder that has been surface-modified, has an average pore size of 2-50 nm, and a specific surface area of ​​50-500 m² / g.

[0011] The aforementioned self-supporting emulsified asphalt based on PVB resin and porous silicon and its preparation method are characterized in that the emulsifier is selected from one or more of sodium alkylbenzene sulfonate, fatty amine salt, and nonylphenol polyoxyethylene ether.

[0012] The aforementioned self-supporting emulsified asphalt based on PVB resin and porous silicon and its preparation method are characterized in that the cross-linking agent is selected from one or more of isocyanate, epoxy resin or silane coupling agent.

[0013] The aforementioned self-supporting emulsified asphalt based on PVB resin and porous silicon and the preparation method thereof are characterized by comprising the following steps: (1) Preparation of emulsified soap solution: Add emulsifier to deionized water at 50-80°C and stir until uniform to form emulsified soap solution; (2) Dissolving PVB resin: Dissolve PVB resin in an organic solvent, and slowly add it and the cross-linking agent into the emulsified soap solution and stir evenly; (3) Porous silicon dispersion: The porous silicon is evenly dispersed in the emulsified soap solution under the action of ultrasound or high-speed shearing to ensure stable suspension; (4) Melting of base asphalt: heating the base asphalt at 140-180°C until it is molten; (5) Preparation of emulsified asphalt: Add the emulsified soap solution into the colloid mill, and slowly add the molten base asphalt. Turn on the mill and mix evenly to finally obtain emulsified asphalt.

[0014] The aforementioned self-supporting emulsified asphalt based on PVB resin and porous silicon and the preparation method thereof are characterized in that after the emulsified asphalt is demulsified, its solidified residue can form a structure with self-supporting ability.

[0015] The beneficial effects of the present invention are as follows: (1) Improving the mechanical properties of emulsified asphalt: PVB resin, as a toughening modifier, can form a uniform dispersed phase in the emulsified asphalt, improve the toughness and impact resistance of the asphalt, and enable it to form a stable structure after demulsification, with excellent self-supporting ability, effectively avoiding flowing and deformation; (2) Enhancing the stability of emulsified asphalt: Porous silicon powder not only acts as a reinforcing filler to improve the strength and aging resistance of asphalt, but also acts as a solid particle stabilizer in the emulsification system to form a stable structure similar to Pickering emulsion, effectively inhibiting the aggregation and sedimentation of emulsion particles, and significantly improving storage stability and construction adaptability; (3) Improving emulsion stability and demulsification controllability: Through the physical adsorption and interface stabilization of porous silicon, the demulsification process of emulsified asphalt is more controllable, thereby improving its reliability in construction applications. , reduce emulsion stratification and water separation, and improve construction quality; (4) Optimize the water resistance and weather resistance of asphalt materials: PVB resin has excellent hydrolysis resistance and aging resistance, so that the emulsified asphalt of the present invention can still maintain a high stability in a humid environment, extend the service life, and improve the durability of the project; (5) Environmental protection and resource recycling: The present invention can utilize the PVB resin in recycled automotive laminated glass to reduce the environmental pollution of waste PVB and achieve high-value utilization of resources. At the same time, non-toxic or low-toxic emulsifiers and cross-linking agents are selected to meet green environmental protection requirements; (6) Applicable to a variety of application scenarios: The self-supporting emulsified asphalt of the present invention can be widely used in road construction, waterproofing projects, bridge protection, tunnel lining and other fields, and is particularly suitable for engineering applications requiring high strength, high stability and self-supporting ability, improving construction quality and service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the preparation process of the self-supporting emulsified asphalt of the present invention.

[0017] Figure 2 It is a graph showing the dynamic viscosity test results of Example 1-2 and Comparative Example 1-2.

[0018] Figure 3 It is a graph showing the elastic recovery test results of Example 1-2 and Comparative Example 1-2. DETAILED DESCRIPTION

[0019] The effects and results of the method of the present invention are further described below with reference to the embodiments, but are not limited to the following embodiments.

[0020] Embodiment 1: A self-supporting emulsified asphalt based on PVB resin and porous silicon and a preparation method thereof, comprising the following steps: S1. Add 30 g of nonylphenol polyoxyethylene ether into 300 g of deionized water at 70°C and stir until uniform to form an emulsified soap solution; S2, dissolving 100 g of industrial-grade PVB resin in ethanol and slowly adding it and 10 g of isocyanate into the emulsified soap solution, stirring evenly; S3, 30 g of nano-porous silicon powder with an average pore size of 20 nm and a specific surface area of ​​300 m² / g is uniformly dispersed in the emulsified soap solution under ultrasonic action to ensure stable suspension; S4. Heat 70# asphalt at 140-180°C until it is molten; S5. Add the emulsified soap solution into the colloid mill, and slowly add the molten base asphalt, turn on the mill to mix evenly, and finally obtain emulsified asphalt.

[0021] Example 2: The steps are the same as those described in Example 1, except that the amount of PVB added is changed from 100 g to 50 g.

[0022] Comparative Example 1: The steps are the same as those described in Example 1, except that the amount of PVB added is changed from 100 g to 0 g.

[0023] Comparative Example 2: The steps are the same as those described in Example 1, except that the amount of PVB added is changed from 100 g to 0 g, and the amount of porous silicon added is changed from 30 g to 0 g.

[0024] The schematic diagram of the preparation process of the self-supporting modified emulsified asphalt of the present invention is as follows Figure 1 Referring to the T0620 standard, the dynamic viscosity (60°C) and elastic recovery (25°C) of the solidified residues after evaporation of the modified emulsified asphalt prepared in the examples and comparative examples of the present application were tested, and the test results were as follows: Figure 2 and Figure 3 shown.

[0025] Dynamic viscosity reflects the fluidity and stability of emulsified asphalt under high temperature conditions and its bonding strength with aggregates, while elastic recovery characteristics measure the deformation recovery ability of emulsified asphalt after being subjected to force, which is directly related to whether it can rebound quickly under vehicle load and reduce permanent deformation of the road surface. Figure 2It can be seen that the dynamic viscosity of the emulsified asphalt solidification residue prepared in the embodiment of the present patent application is significantly higher than that of the comparative example, indicating that the synergistic effect of PVB and porous silicon effectively improves the high temperature stability of the emulsified asphalt. Figure 3 The results further show that the elastic recovery rate of the emulsified asphalt obtained in Examples 1 and 2 is close to 100%, showing excellent self-supporting ability. In contrast, the elastic recovery rate of Comparative Example 1 (without PVB) is significantly reduced, and the elastic recovery rate of Comparative Example 2 is further reduced after the porous silicon is removed. This shows that the synergistic effect of PVB and porous silicon significantly enhances the mechanical properties of the emulsified asphalt, giving it better deformation recovery ability and structural stability.

[0026] It can be seen from the above examples that the self-supporting emulsified asphalt based on PVB resin and porous silicon prepared by the present invention has good high temperature stability, adhesion and self-supporting ability, and the comprehensive mechanical properties of the modified asphalt are significantly improved. Compared with conventional technologies, the content of the present invention has significant technical progress.

Claims

1. A self-supporting emulsified asphalt based on PVB resin and porous silicon and a preparation method thereof, characterized in that: The invention comprises the following raw materials in parts by weight: 40-60 parts of base asphalt, 5-15 parts of PVB resin, 2-10 parts of porous silicon, 1-5 parts of emulsifier, 0.5-5 parts of cross-linking agent and 20-60 parts of water.

2. A self-supporting emulsified asphalt based on PVB resin and porous silicon and a preparation method thereof according to claim 1, characterized in that: The matrix asphalt is at least one of 70# or 90# petroleum asphalt.

3. A self-supporting emulsified asphalt based on PVB resin and porous silicon and a preparation method thereof according to claim 1, characterized in that: The PVB resin is PVB recycled from automobile laminated glass or industrial-grade PVB resin.

4. A self-supporting emulsified asphalt based on PVB resin and porous silicon and a preparation method thereof according to claim 1, characterized in that: The porous silicon is a nanometer-scale or micrometer-scale porous silicon powder that has been surface-modified, has an average pore size of 2-50 nm, and a specific surface area of ​​50-500 m² / g.

5. A self-supporting emulsified asphalt based on PVB resin and porous silicon and a preparation method thereof according to claim 1, characterized in that: The emulsifier is selected from one or more of sodium alkylbenzene sulfonate, fatty amine salt, and nonylphenol polyoxyethylene ether.

6. A self-supporting emulsified asphalt based on PVB resin and porous silicon and a preparation method thereof according to claim 1, characterized in that: The cross-linking agent is selected from one or more of isocyanate, epoxy resin or silane coupling agent.

7. A self-supporting emulsified asphalt based on PVB resin and porous silicon and a preparation method thereof, characterized in that: The following steps are involved: S1. Preparation of emulsified soap solution: add emulsifier to deionized water at 50-80°C and stir until uniform to form emulsified soap solution; S2. PVB resin dissolution: dissolve the PVB resin in an organic solvent, and slowly add the PVB resin and the cross-linking agent into the emulsified soap solution at the same time, and stir evenly; S3, porous silicon dispersion: the porous silicon is evenly dispersed in the emulsified soap solution under the action of ultrasound or high-speed shearing to ensure stable suspension; S4. Melting of base asphalt: heating the base asphalt at 140-180°C to a molten state; S5. Preparation of emulsified asphalt: Add the emulsified soap solution into the colloid mill, and slowly add the molten base asphalt, turn on the mill and mix evenly to finally obtain the emulsified asphalt.

8. A self-supporting emulsified asphalt based on PVB resin and porous silicon and a preparation method thereof according to claim 7, characterized in that: After the emulsified asphalt is demulsified, the solidified residue can form a structure with self-supporting ability.

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