A uv-enhanced polyvinyl butyral modified asphalt and a method of making the same

Abstract

The present application provides a kind of UV reinforced polyvinyl butyral modified asphalt and its preparation method.The modified asphalt is based on matrix asphalt, polyvinyl butyral, photoinitiator and crosslinking aid are added, and the uniform dispersion and crosslinking reaction of polyvinyl butyral in asphalt system are promoted by UV light, so as to improve the ultraviolet aging resistance, bonding strength and weather resistance of asphalt.The preparation steps include: heating the matrix asphalt to 140-190℃, adding polyvinyl butyral shear stirring, then adding photoinitiator and crosslinking aid, and continuing to stir under UV light to form a uniform modified asphalt system.The method can significantly improve the aging resistance, high temperature stability and low temperature crack resistance of modified asphalt, and is suitable for road paving, bridge waterproofing and other high durability engineering fields, and has good industrial application prospect.

Description

Technical Field

[0001] This invention relates to the field of road engineering materials and waterproof materials, specifically to a UV-reinforced polyvinyl butyral modified asphalt and its preparation method. Background Technology

[0002] Asphalt, due to its excellent adhesion and waterproofing properties, is widely used in road paving, bridge waterproofing, and building sealing projects. However, traditional asphalt, under long-term use, is affected by ultraviolet (UV) radiation, oxidation, high temperatures, and humid environments, leading to aging, a decrease in softening point, cracking, and reduced bond strength, severely impacting the service life of roads and waterproofing layers. Therefore, improving the aging resistance, weather resistance, and bond strength of asphalt is one of the important research directions in current road engineering and waterproofing materials.

[0003] Polyvinyl butyral (PVB) is a polymer material with excellent weather resistance, oxidation resistance, flexibility, and adhesion, and has been widely used in laminated glass, composite materials, and coatings. Introducing PVB as a modifier into asphalt is expected to improve its high-temperature stability, low-temperature crack resistance, and anti-aging properties. However, PVB has poor dispersibility and compatibility in asphalt systems, affecting the modification effect. Therefore, there is an urgent need for an efficient method to improve the stability and durability of PVB-modified asphalt.

[0004] Ultraviolet (UV) light enhancement technology is a highly efficient modification method that has been applied to the crosslinking and weather resistance improvement of polymer materials. Through the synergistic effect of photoinitiators (such as benzophenone and benzoin dimethyl ether) and crosslinking aids (such as benzoyl peroxide and bismaleimide), UV light irradiation can trigger a crosslinking reaction between PVB and asphalt molecules, forming a stable network structure, thereby improving the aging resistance, bond strength, and long-term performance of the modified asphalt. Furthermore, by rationally controlling the UV irradiation wavelength and intensity, the crosslinking reaction can be further optimized, improving the modification effect.

[0005] Based on the above background, this invention provides a UV-enhanced PVB-modified asphalt and its preparation method. Through the organic compounding of base asphalt, PVB resin, photoinitiator, and crosslinking aid, and enhanced by UV light irradiation, PVB forms a uniform and stable crosslinked structure in the asphalt system, thereby improving the asphalt's resistance to UV aging, weather resistance, and bond strength. The modified asphalt prepared by this method can be widely used in road paving, bridge waterproofing, tunnel lining, and other high-durability engineering fields, possessing significant engineering application value and promising prospects for widespread application. Summary of the Invention

[0006] This invention provides a UV-enhanced polyvinyl butyral modified asphalt and its preparation method, aiming to improve the UV aging resistance, bond strength, and weather resistance of asphalt. By introducing a photoinitiator and a crosslinking aid into the polyvinyl butyral (PVB) modified asphalt system and combining it with ultraviolet (UV) irradiation technology, the uniform dispersion and crosslinking reaction of PVB in asphalt are promoted, thereby forming a stable modified asphalt system and overcoming the problems of poor PVB dispersion and limited modification effect in existing technologies.

[0007] The technical solution of the present invention is as follows: a UV-enhanced polyvinyl butyral modified asphalt and its preparation method, characterized in that it comprises the following raw materials in parts by weight: 100 parts of base asphalt, 5-15 parts of polyvinyl butyral, 0.5-2.5 parts of photoinitiator, and 0.1-1.5 parts of crosslinking aid.

[0008] The aforementioned UV-reinforced polyvinyl butyral modified asphalt and its preparation method are characterized in that the base asphalt is at least one of 70# asphalt or 90# asphalt.

[0009] The aforementioned UV-enhanced polyvinyl butyral modified bitumen and its preparation method are characterized in that the photoinitiator is one or more of benzophenone, benzoin dimethyl ether, and 2,4,6-(trimethylbenzoyl)diphenylphosphine oxide.

[0010] The aforementioned UV-reinforced polyvinyl butyral modified bitumen and its preparation method are characterized in that the crosslinking aid is one or more of benzoyl peroxide, di-tert-butyl peroxide, p-benzoylquinone dioxime, and bismaleimide.

[0011] A UV-reinforced polyvinyl butyral modified asphalt and its preparation method, characterized by comprising the following steps:

[0012] (1) Heat the base asphalt at 140-190℃ until it is completely melted;

[0013] (2) Under stirring conditions, add polyvinyl butyral to the molten asphalt and continue shearing and stirring for 30-60 minutes to ensure that it is fully dispersed;

[0014] (3) Add photoinitiator and crosslinking aid, maintain temperature and stir for 10 minutes, then continue stirring for 20-50 minutes under UV light irradiation to form a uniform modified asphalt system;

[0015] (4) Cool to room temperature to obtain UV-strengthened polyvinyl butyral modified asphalt.

[0016] The aforementioned UV-reinforced polyvinyl butyral modified asphalt and its preparation method are characterized in that the wavelength range of the UV light is 260-380 nm and the irradiation intensity is 20-40 mW / cm².

[0017] The beneficial effects of this invention are as follows: (1) Significantly improves UV aging resistance: By using UV light irradiation combined with photo-initiated crosslinking technology, PVB forms a stable network structure in asphalt, which improves the UV aging resistance of asphalt, reduces the performance degradation caused by long-term exposure to sunlight, and effectively extends the service life of road and waterproof materials. (2) Enhances bonding strength and durability: The introduction of PVB increases the polarity of asphalt, which enhances its adhesion to mineral aggregates or base materials, reduces the risk of peeling, and improves the stability and durability of engineering structures. (3) Optimizes high-temperature stability and low-temperature crack resistance: PVB-modified asphalt reinforced by UV can maintain good rheological properties at high temperatures, reducing the risk of softening, while improving flexibility at low temperatures and reducing the risk of cracks caused by temperature changes. (4) Improves the controllability and applicability of the preparation process: The preparation method of this invention combines temperature-controlled stirring with UV irradiation. The process is simple, energy-efficient, and suitable for large-scale industrial production. It can also be applied to multiple fields such as road paving and waterproofing projects, and has good promotional value. Attached Figure Description

[0018] Figure 1 This is a schematic diagram illustrating the preparation process of the polyvinyl butyral modified asphalt of this invention.

[0019] Figure 2 The graph shows a performance comparison between the examples and the comparative examples. Detailed Implementation

[0020] The following examples further illustrate the function and effect of the method of the present invention, but are not limited to the following examples.

[0021] Example: 100 g of 70# asphalt was heated to 150°C until completely melted. Under stirring, 10 g of polyvinyl butyral was added to the melted asphalt, and shearing and stirring were continued for 30 minutes to ensure full dispersion. 1 g of benzophenone and 0.5 g of bismaleimide were added, and the temperature was maintained while stirring for 10 minutes. Subsequently, under UV light with a wavelength of 360 nm and an intensity of 30 mW / cm², stirring was continued for 30 minutes to form a homogeneous modified asphalt system. The system was then cooled to room temperature to obtain UV-reinforced polyvinyl butyral modified asphalt.

[0022] Comparative example: The steps are the same as described in the examples, except that the amount of polyvinyl butyral added is changed from 10 g to 0 g, and the sample is not exposed to UV light.

[0023] A schematic diagram of the preparation process of the PVB-modified asphalt of this invention is shown below. Figure 1 As shown. Softening point, penetration, and ductility are the three key indicators for evaluating asphalt performance. The test results of the examples and comparative samples are as follows. Figure 2 As shown. By Figure 2 As can be seen, this invention significantly increases the softening point of asphalt and enhances its adhesion and plasticity under high-temperature conditions, thereby improving its rutting resistance. The decrease in penetration indicates that under UV strengthening, PVB and asphalt undergo synergistic cross-linking, forming a denser network structure, increasing asphalt viscosity, and thus reducing the impact of temperature fluctuations on rheological properties. Ductility test results show that UV-strengthened PVB effectively improves the ductility of asphalt, enhances its resistance to deformation, and contributes to improving the overall durability and crack resistance of the material. Furthermore, the cross-linking of PVB and asphalt under UV strengthening effectively improves the aging resistance of asphalt, reduces the impact of ultraviolet radiation and oxidation on asphalt properties, slows down its aging rate, and thus extends the service life of asphalt materials.

[0024] As demonstrated by the above embodiments, the UV-reinforced polyvinyl butyral modified asphalt prepared by this invention exhibits excellent performance in terms of high-temperature stability, adhesion, deformation resistance, and aging resistance, significantly improving the overall performance of the modified asphalt. Compared to conventional technologies, this invention represents a significant technological advancement, demonstrating high innovation and engineering application value.

Claims

1. A UV- reinforced polyvinyl butyral modified bitumen, characterized in that, The raw materials include the following parts by weight: 100 parts of base bitumen, 5-15 parts of polyvinyl butyral, 0.5-2.5 parts of photoinitiator, and 0.1-1.5 parts of crosslinking aid. The photoinitiator is one or more of benzophenone, benzoin dimethyl ether, and 2,4,6-trimethylbenzoyl diphenylphosphine oxide. The crosslinking aid is one or more of benzoyl peroxide, di-tert-butyl peroxide, p-benzoylquinone dioxime, and bismaleimide. The modification method includes the following steps: S1. Heat the base asphalt at 140-190℃ until it is completely melted; S2. Under stirring conditions, add polyvinyl butyral to the molten asphalt and continue shearing and stirring for 30-60 minutes to ensure it is fully dispersed. S3. Add photoinitiator and crosslinking aid, maintain temperature and stir for 10 minutes, then continue stirring for 20-50 minutes under UV light irradiation with a wavelength range of 260-380nm and an irradiation intensity of 20-40 mW / cm² to form a uniform modified asphalt system. S4. Cool to room temperature to obtain UV-reinforced polyvinyl butyral modified asphalt.

2. The UV- reinforced polyvinyl butyral modified asphalt according to claim 1, characterized in that, The base asphalt is at least one of 70# asphalt or 90# asphalt.

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