Flame-retardant modified asphalt based on PVB and recycled PC and preparation method thereof

Abstract

The application provides a kind of flame-retardant modified asphalt based on polyvinyl butyral (PVB) and recycled polycarbonate (PC) and a preparation method thereof. The method significantly improves the flame-retardant performance, adhesion and high-low temperature stability of asphalt by compounding PVB with recycled PC and adding them into the base asphalt. The specific preparation steps are as follows: first, PVB and recycled PC are added into a pulverizer to obtain PVB-PC composite powder; second, the base asphalt is heated and melted; then, the PVB-PC composite powder is added into the melted base asphalt together with a solubilizing agent for mixing, stirring and swelling; finally, an anti-aging agent is added for shearing and stirring to obtain the flame-retardant modified asphalt. The application innovatively uses recycled PC plastic and PVB for the synergistic modification of asphalt, significantly improving the comprehensive performance of asphalt. In addition, the recycling of waste PC not only helps to reduce environmental pollution, but also provides a new application approach for the high-value utilization of waste plastics. The flame-retardant modified asphalt has a wide application prospect in road construction, waterproof materials and other infrastructure, conforms to the concept of sustainable development and green environmental protection, and has important social value and economic benefits.

Description

Technical Field

[0001] This invention relates to the field of asphalt modification technology, and in particular to a flame-retardant modified asphalt based on PVB and recycled PC and its preparation method. Background Technology

[0002] Asphalt, as an important building and road material, is widely used in highways, bridges, airport runways, parking lots, and building waterproofing, among other fields. With the rapid development of infrastructure construction in my country, the application scope of asphalt is constantly expanding, and its importance is becoming increasingly prominent. Asphalt possesses excellent plasticity, adhesion, and waterproofing properties, providing durable and stable performance guarantees. Especially in large-scale road construction and transportation hubs, the use of asphalt materials plays a crucial role.

[0003] However, despite its many advantages, asphalt still faces some significant problems during long-term use, particularly its flammability and aging. The flammability of asphalt is a critical issue that urgently needs to be addressed. Asphalt is easily ignited in high-temperature or fire environments. In warehouses, parking lots, and building rooftops in hot climates, the flammability of asphalt poses a safety hazard; the toxic gases and fumes produced during combustion not only pollute the environment but also seriously threaten the safety of surrounding people. Furthermore, when exposed to ultraviolet radiation and high temperatures, the molecular structure of asphalt undergoes degradation and oxidation, leading to a gradual decline in its physical properties, manifested as decreased adhesion, reduced toughness, surface cracking, and peeling. Aging asphalt not only affects the smoothness and aesthetics of roads but also causes uneven road surfaces, increasing traffic safety hazards. Simultaneously, the low-temperature embrittlement of asphalt is particularly severe in cold climates; at low temperatures, asphalt is prone to cracking, leading to road damage and disrupting traffic flow. Therefore, effectively improving the flame retardancy, aging resistance, and crack resistance of asphalt has become an important topic in the field of asphalt modification technology.

[0004] With the increasing severity of global plastic pollution, waste plastics have placed a tremendous burden on the environment. Plastic products are difficult to degrade in the natural environment, and their long-term accumulation not only pollutes water sources, soil, and air, but also poses a serious threat to ecosystems and biodiversity. According to a United Nations report, millions of tons of plastic waste are generated globally each year, and the majority of these plastic products ultimately end up in landfills, oceans, and the natural environment as waste, causing persistent environmental pollution. Therefore, how to efficiently and environmentally manage waste plastics and give them new value has become a focus of global attention.

[0005] Recycling waste plastics not only helps reduce environmental pollution but also provides a new approach to asphalt modification. Polycarbonate (PC), a common engineering plastic, possesses excellent physicochemical properties, particularly in fire resistance and weather resistance. Recycling and applying it to asphalt modification can not only improve asphalt performance but also achieve the effective reuse of plastic waste, balancing environmental protection and economic benefits.

[0006] Polyvinyl butyral (PVB) is a polymer material with excellent film-forming properties, adhesion, and weather resistance. PVB is widely used in automotive window glass, architectural glass, and other fields. The molecular structure of PVB contains abundant polar functional groups, which can interact with asphalt molecules, thereby enhancing the compatibility of asphalt and improving its mechanical properties and thermal stability. Furthermore, the film-forming properties of PVB can effectively improve the crack resistance of asphalt, reduce surface cracking and spalling, and extend the service life of asphalt.

[0007] PVB and PC each possess unique physicochemical properties, and they can exert a synergistic effect in asphalt. When PVB and PC work together in asphalt, they not only enhance the overall performance of the asphalt but also enable it to maintain a longer service life under varying environmental conditions. Through this synergistic effect, modified asphalt exhibits significant advantages in flame retardancy, high and low temperature resistance, and aging resistance, making it particularly suitable for road construction and other infrastructure projects in complex environments such as high temperature, high humidity, and cold.

[0008] This invention innovatively combines recycled PC plastic with PVB for the first time in asphalt modification, leveraging their synergistic effects to prepare a novel flame-retardant modified asphalt. This innovative solution not only effectively addresses the flammability, aging resistance, and cracking issues of asphalt but also provides a new approach to recycling waste plastics, thereby promoting the development of environmental protection technologies. This modified asphalt exhibits high flame retardancy, excellent aging resistance, and high and low temperature stability, making it widely applicable in road construction, waterproof membranes, roofing materials, and other fields, possessing significant social value and economic benefits. Summary of the Invention

[0009] The purpose of this invention is to provide a flame-retardant modified asphalt based on PVB and recycled PC and its preparation method. By compounding PVB with recycled PC and applying it to the modification of base asphalt, a modified asphalt with high flame retardancy, anti-aging properties and high and low temperature stability is prepared.

[0010] This invention addresses the shortcomings of existing technologies by proposing a flame-retardant modified asphalt based on polyvinyl butyral (PVB) and recycled polycarbonate (PC), along with its preparation method. By introducing PVB, the adhesion and crack resistance of the asphalt are significantly enhanced, while the excellent flame-retardant properties of PC improve its fire resistance. The synergistic effect of PVB and PC not only effectively improves the high and low temperature stability of the asphalt but also significantly extends its service life. Furthermore, this invention enables the recycling and reuse of waste PC plastic, solving the problem of plastic waste pollution and providing an innovative and environmentally friendly solution for asphalt modification.

[0011] The technical solution of the present invention is as follows: a flame-retardant modified asphalt based on PVB and recycled PC and its preparation method, comprising the following raw materials in parts by weight: 100 parts of base asphalt, 1-8 parts of PVB-PC composite powder, 0.5-10 parts of solubilizer, and 0.5-3 parts of anti-aging agent.

[0012] The aforementioned flame-retardant modified asphalt based on PVB and recycled PC and its preparation method are characterized in that the base asphalt is at least one of 70# asphalt or 90# asphalt.

[0013] The aforementioned flame-retardant modified asphalt based on PVB and recycled PC and its preparation method are characterized in that the PVB-PVC composite powder is a solid mixed powder obtained by crushing polyvinyl butyral (PVB) and recycled polycarbonate (PC) using a pulverizer, and the mass ratio of PVB to recycled PC is 1:1-2.

[0014] The aforementioned flame-retardant modified asphalt based on PVB and recycled PC and its preparation method are characterized in that the solubilizer is selected from one or more of cyclodextrin, phosphatidylcholine and povidone; and the anti-aging agent is selected from one or more of p-phenylenediamine, tert-butylhydroquinone, butylated hydroxyanisole and triazole.

[0015] The aforementioned flame-retardant modified asphalt based on PVB and recycled PC and its preparation method are characterized by comprising the following steps:

[0016] (1) PVB and recycled PC were added to a pulverizer and pulverized at a voltage of 220V and a power of 650W, with a motor speed of 28000 rpm, to obtain PVB-PC composite powder;

[0017] (2) Melt the base bitumen at 160-180℃;

[0018] (3) Add PVB-PC composite powder and solubilizer to the molten base bitumen, and mix and stir at 900-1100 rpm for 30-60 min to swell;

[0019] (4) Add an anti-aging agent to the asphalt after stirring and swelling in step 3, and shear and stir at 900-1100 rpm for 10-30 min, cool to room temperature, and obtain the flame-retardant modified asphalt.

[0020] The beneficial effects of this invention are as follows: (1) By introducing recycled polycarbonate (PC) plastic, the flame retardant properties of asphalt are significantly improved, reducing the risk of fire, and it is particularly suitable for places requiring high safety; (2) The use of polyvinyl butyral (PVB) enhances the adhesion and crack resistance of asphalt, improves its high and low temperature performance, and extends its service life, especially in cold regions where it performs better; (3) The synergistic effect of PVB and PC comprehensively improves the flame retardant, crack resistance, and adhesion properties of asphalt, enhancing its overall safety and durability, and meeting the needs of modern infrastructure for high-performance materials; (4) The use of waste PC plastic for asphalt modification not only effectively reduces environmental pollution, but also provides a new way for the recycling of waste plastics, which has significant environmental value; (5) The use of recycled plastic to modify asphalt can reduce production costs, promote sustainable green industrial development, and has high economic and social value. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the preparation process of the flame-retardant modified asphalt of the present invention.

[0022] Figure 2 The graph shows the softening point test results for Examples 1-2 and Comparative Examples 1-2.

[0023] Figure 3 The figures show the penetration test results of Examples 1-2 and Comparative Examples 1-2.

[0024] Figure 4 The figures show the ductility test results of Examples 1-2 and Comparative Examples 1-2.

[0025] Figure 5 The graph shows the limiting oxygen index test results for Examples 1-2 and Comparative Examples 1-2. Detailed Implementation

[0026] The following examples further illustrate the function and effect of the method of the present invention, but are not limited to the following examples.

[0027] Example 1: 10 g of PVB and 10 g of recycled PC plastic granules were added to a pulverizer and pulverized at 220V and 650W with a motor speed of 28000 rpm to obtain PVB-PC composite powder; 1 kg of 70# asphalt was melted at 160℃; the above PVB-PC composite powder and 5 g of cyclodextrin were added to the molten asphalt, and the mixture was stirred and swollen at 1000 rpm for 30 min; 10 g of tert-butylhydroquinone was added to the swollen asphalt, and the mixture was sheared and stirred at 1000 rpm for 20 min, and then cooled to room temperature to obtain the flame-retardant modified asphalt.

[0028] Example 2: The steps are the same as in Example 1, except that the amount of recycled PC plastic added is changed from 10 g to 15 g.

[0029] Comparative Example 1: The steps are the same as described in Example 1, except that the amount of recycled PC plastic granules added is changed from 10 g to 0 g.

[0030] Comparative Example 2: The steps are the same as those in Example 1, except that the amount of PVB added is changed from 10 g to 0 g, and the amount of recycled PC plastic particles added is changed from 10 g to 0 g.

[0031] A schematic diagram of the preparation process of the flame-retardant modified asphalt of this invention is shown below. Figure 1 As shown in the figure. Softening point, penetration, and ductility are the three key indicators for evaluating asphalt performance. The test results of softening point, penetration, and ductility of Examples 1-2 and Comparative Examples 1-2 are shown in the figure. Figure 2 , Figure 3 and Figure 4 As shown. By Figure 2 It can be seen that the addition of PVB-PC composite powder effectively increases the softening point of asphalt and enhances its adhesion and plasticity at high temperatures. Figure 3 It can be seen that the decrease in penetration indicates that the PVB-PC composite powder makes the asphalt more viscous and reduces the impact of temperature fluctuations on the asphalt fluidity. Figure 4 The ductility data show that the addition of PVB-PC composite powder effectively improved the ductility of asphalt and enhanced its resistance to deformation. The improvement in ductility was mainly attributed to the addition of PVB, while the effect of PC on improving ductility was not significant. The limiting oxygen index test results of Examples 1-3 and Comparative Examples 1-2 are as follows: Figure 5 As shown. Analysis Figure 5 The data shows that the flame-retardant asphalt provided in Examples 1-2 of the present invention has a significantly higher limiting oxygen index than the comparative example, and its flame-retardant performance is effectively improved.

[0032] As demonstrated by the above embodiments, the flame-retardant modified asphalt based on PVB and recycled PC prepared by this invention exhibits good high-temperature stability, adhesion, deformation resistance, and flame retardancy. The overall performance of the modified asphalt is significantly improved. Compared with conventional technologies, this invention represents a significant technological advancement.

Claims

1. A flame-retardant modified bitumen based on PVB and recycled PC, characterized in that, The base pitch is 70# pitch or 90# pitch.

2. The flame-retardant modified bitumen based on PVB and recycled PC according to claim 1, characterized by the fact that, The anti-aging agent is t-butyl hydroquinone or butyl hydroxy anisole.

3. The flame-retardant modified bitumen based on PVB and recycled PC according to claim 1, characterized in that, The method comprises the following steps:

4. A process for the preparation of a flame-retardant modified bitumen based on PVB and recycled PC according to claim 1, characterized by, S1, adding PVB and recycled PC into a pulverizer to perform pulverization under a voltage of 220 V and a power of 650 W, and the motor rotating speed is 28000 rpm, to obtain PVB-PC composite powder; S2, melting the base pitch at 160-180 DEG C; S3, adding the PVB-PC composite powder and the solubilizing agent into the melted base pitch, and mixing and stirring to swell for 30-60 min under 900-1100 rpm; S4, adding the anti-aging agent into the base pitch after stirring and swelling as described in step S3, and performing shearing stirring for 10-30 min under 900-1100 rpm, and cooling to room temperature, to obtain the flame-retardant modified pitch. ​

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