A self-supporting emulsified asphalt based on a pvb resin and porous silicon and a method for its production

Abstract

The application provides a self-supporting emulsified asphalt based on PVB resin and porous silicon and a preparation method thereof. The method significantly improves the mechanical strength, water resistance and stability of the emulsified asphalt by introducing PVB resin and porous silicon. The specific preparation steps include: preparing an emulsified soap solution, dissolving PVB resin, dispersing porous silicon, melting base asphalt and preparing emulsified asphalt. The application innovatively uses porous silicon to construct a stable emulsion structure, and enhances the toughness of the asphalt through PVB resin, so that the asphalt film after demulsification has excellent self-supporting capacity. The modified emulsified asphalt has a wide application prospect in the fields of road engineering, waterproof materials and the like, and provides a new technical approach for the preparation of high-performance asphalt materials.

Description

Technical Field

[0001] This invention relates to the field of road engineering materials technology, specifically to a self-supporting emulsified asphalt based on PVB resin and porous silica and its preparation method. Background Technology

[0002] Asphalt, due to its excellent adhesion, waterproofing, and durability, is widely used in road paving, waterproofing coatings, and building materials. Emulsified asphalt, as a water-based dispersion system, is widely used in highway construction, bridge waterproofing, and roof waterproofing projects due to its good low-temperature workability and environmental friendliness. However, traditional emulsified asphalt still faces some key challenges in application, such as low mechanical strength after demulsification, easy flow, and poor water resistance, making it difficult to meet the demands of high-performance engineering. Therefore, developing self-supporting emulsified asphalt materials is of significant practical importance.

[0003] To improve the mechanical properties of emulsified asphalt, researchers have recently explored polymer modification techniques to enhance its structural stability. Polyvinyl butyral (PVB) resin, due to its excellent toughness, adhesion, and aging resistance, has been used to modify asphalt, enhancing its mechanical strength and weather resistance. Furthermore, porous silica powder, as an inorganic filler with a high specific surface area, not only provides reinforcement and improves the mechanical properties of asphalt, but also acts as a solid particle stabilizer in emulsion systems, forming a stable structure similar to Pickering emulsions. This effectively inhibits the aggregation and sedimentation of emulsion particles, improving the storage stability and construction adaptability of emulsified asphalt.

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

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

[0006] This invention addresses the shortcomings of existing technologies by proposing a self-supporting emulsified asphalt based on PVB resin and porous silica, and its preparation method. PVB resin acts as a toughening modifier, improving the flexibility and aging resistance of the asphalt; porous silica powder not only serves as a reinforcing filler, enhancing the mechanical properties of the asphalt, but also acts as a solid particle stabilizer in the emulsion system, forming a stable structure similar to Pickering emulsions, effectively inhibiting the aggregation and sedimentation of emulsion particles.

[0007] The technical solution of the present invention is a self-supporting emulsified asphalt based on PVB resin and porous silica and its preparation method, 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 silica, 1-5 parts of emulsifier, 0.5-5 parts of crosslinking agent, and 20-60 parts of water.

[0008] The aforementioned self-supporting emulsified asphalt based on PVB resin and porous silica 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 silica and its preparation method are characterized in that the PVB resin is recycled PVB from automotive laminated glass or industrial-grade PVB resin.

[0010] The aforementioned self-supporting emulsified asphalt based on PVB resin and porous silica and its preparation method are characterized in that the porous silica is a nano- or micro-sized porous silica powder with surface modification treatment, 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 silica 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 silica and its preparation method are characterized in that the crosslinking 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 silica and its preparation method are characterized by comprising the following steps:

[0014] (1) Preparation of emulsified soap solution: Add emulsifier to deionized water at 50-80℃ and stir until uniform to form emulsified soap solution;

[0015] (2) PVB resin dissolution: Dissolve PVB resin in an organic solvent and slowly add it and crosslinking agent to the emulsified soap solution at the same time, and stir evenly;

[0016] (3) Porous silica dispersion: Porous silica is uniformly dispersed in emulsified soap solution under ultrasonic or high-speed shearing to ensure stable suspension;

[0017] (4) Melting of base asphalt: Heating the base asphalt to a molten state at 140-180℃;

[0018] (5) Preparation of emulsified asphalt: Add emulsified soap solution to the colloid mill and slowly add molten base asphalt. Turn on the mill to mix evenly and finally obtain emulsified asphalt.

[0019] The aforementioned self-supporting emulsified asphalt based on PVB resin and porous silica and its preparation method are characterized in that, after demulsification, the solidified residue of the emulsified asphalt can form a structure with self-supporting capabilities.

[0020] The beneficial effects of this invention are as follows: (1) Improved mechanical properties of emulsified asphalt: PVB resin, as a toughening modifier, can form a uniform dispersed phase in emulsified asphalt, improve the toughness and impact resistance of asphalt, and make it form a stable structure after demulsification, with excellent self-supporting ability, effectively avoiding flow and deformation; (2) Enhanced stability of emulsified asphalt: Porous silica 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 emulsion system, forming 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) Improved emulsion stability and demulsification controllability: Through the physical adsorption and interface stabilization of porous silica, the demulsification process of emulsified asphalt is more controllable, thereby improving its reliability in construction applications. (3) 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 high stability in humid environments, extend service life, and improve engineering durability; (5) Environmental protection and resource reuse: The present invention can utilize recycled PVB resin in automotive laminated glass, reduce the environmental pollution of waste PVB, realize the high-value utilization of resources, and select non-toxic or low-toxic emulsifiers and crosslinking agents, which meet the requirements of green environmental protection; (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 especially suitable for engineering applications that require high strength, high stability and self-supporting ability, improving construction quality and service life. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the preparation process of the self-supporting emulsified asphalt of the present invention.

[0022] Figure 2The graph shows the dynamic viscosity test results of Examples 1-2 and Comparative Examples 1-2.

[0023] Figure 3 The figures show the elastic recovery test results of Examples 1-2 and Comparative Examples 1-2. Detailed Implementation

[0024] The following examples further illustrate the function and effect of the method of the present invention, but are not limited to the following examples.

[0025] Example 1: A self-supporting emulsified asphalt based on PVB resin and porous silica and its preparation method, comprising the following steps:

[0026] S1. Add 30 g of nonylphenol polyoxyethylene ether to 300 g of deionized water at 70°C and stir until homogeneous to form an emulsified soap solution.

[0027] S2. Dissolve 100 g of industrial-grade PVB resin in ethanol and slowly add it and 10 g of isocyanate to the emulsified soap solution, stirring until evenly mixed.

[0028] S3. 30 g of nano-sized porous silica powder with an average pore size of 20 nm and a specific surface area of ​​300 m² / g is uniformly dispersed in emulsified soap solution under ultrasonic action to ensure stable suspension.

[0029] S4. Heat 70# asphalt to a molten state at 140-180℃;

[0030] S5. Add the emulsified soap solution to the colloid mill, and slowly add the molten base asphalt. Turn on the mill to mix evenly, and finally obtain the emulsified asphalt.

[0031] Example 2: The steps are the same as in Example 1, except that the amount of PVB added is changed from 100 g to 50 g.

[0032] Comparative Example 1: The steps are the same as described in Example 1, except that the amount of PVB added is changed from 100 g to 0 g.

[0033] Comparative Example 2: The steps are the same as those 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.

[0034] A schematic diagram of the preparation process of the self-supporting modified emulsified asphalt of this invention is shown below. Figure 1 As shown. The dynamic viscosity (60℃) and elastic recovery (25℃) of the post-evaporation cured residues of the modified emulsified asphalt prepared in the embodiments and comparative examples of this application were tested according to standard T0620. The test results are shown below. Figure 2 and Figure 3 As shown.

[0035] Dynamic viscosity reflects the fluidity, stability, and bond strength of emulsified asphalt to aggregates under high-temperature conditions, while elastic recovery characteristics measure the deformation recovery ability of emulsified asphalt under stress, directly affecting its ability to rebound rapidly under vehicle loads and reduce permanent pavement deformation. Figure 2 As can be seen, the dynamic viscosity of the solidified residue of the emulsified asphalt prepared in the embodiments of this patent application is significantly higher than that of the comparative example, indicating that the synergistic effect of PVB and porous silica effectively improves the high-temperature stability of the emulsified asphalt. Figure 3 The results further show that the emulsified asphalt obtained in Examples 1 and 2 exhibits an elastic recovery rate close to 100%, demonstrating excellent self-supporting ability. In contrast, the elastic recovery rate of Comparative Example 1 (without PVB) is significantly reduced, while the elastic recovery rate of Comparative Example 2 further decreases after the removal of porous silica. This indicates that the synergistic effect of PVB and porous silica significantly enhances the mechanical properties of the emulsified asphalt, giving it superior deformation recovery ability and structural stability.

[0036] As demonstrated by the above embodiments, the self-supporting emulsified asphalt based on PVB resin and porous silica prepared by this invention exhibits 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, this invention represents a significant technological advancement.

Claims

1. A self-supporting emulsified asphalt based on PVB resin and porous silica, characterized in that, The raw materials include the following parts by weight: 40-60 parts matrix bitumen, 5-15 parts PVB resin, 2-10 parts porous silica, 1-5 parts emulsifier, 0.5-5 parts crosslinking agent, and 20-60 parts water; wherein the PVB resin is recycled PVB from automotive laminated glass or industrial-grade PVB resin; the porous silica is surface-modified nano- or micron-sized porous silica powder with an average pore size of 2-50 nm and a specific surface area of ​​50-500 m² / g; the emulsifier is selected from one or more of sodium alkylbenzene sulfonate, fatty amine salt, and nonylphenol polyoxyethylene ether; and the crosslinking agent is selected from one or more of isocyanate, epoxy resin, or silane coupling agent.

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

3. A process for the preparation of a self-supporting emulsified bitumen based on PVB resin and porous silicon according to claim 1, characterized by, Includes the following steps: S1. Preparation of emulsified soap solution: Add emulsifier to deionized water at 50-80℃ and stir until uniform to form emulsified soap solution; S2. PVB resin dissolution: Dissolve the PVB resin in an organic solvent and slowly add it and the crosslinking agent to the emulsified soap solution at the same time, stirring until evenly mixed. S3. Porous silica dispersion: Porous silica is uniformly dispersed in emulsified soap solution under ultrasonic or high-speed shearing action; S4. Melting of base asphalt: Heating the base asphalt to a molten state at 140-180℃; S5. Preparation of emulsified asphalt: Add emulsified soap solution to the colloid mill and slowly add molten base asphalt. Start the mill and mix evenly to obtain emulsified asphalt.

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