Flame-retardant modified asphalt based on PVB (Polyvinyl Butyral) and recycled PC (Polycarbonate) and preparation method thereof

Abstract

The invention provides flame-retardant modified asphalt based on polyvinyl butyral (PVB) and recycled polycarbonate (PC) and a preparation method of the flame-retardant modified asphalt. According to the method, PVB and recycled PC are compounded and added into matrix asphalt, so that the flame retardance, cohesiveness and high and low temperature stability of the asphalt are remarkably improved. The preparation method comprises the following specific preparation steps: firstly, adding PVB and recycled PC into a crusher to prepare PVB-PC composite powder; secondly, heating and melting the matrix asphalt; then adding the PVB-PC composite powder and a solubilizer into the molten matrix asphalt, and mixing, stirring and swelling; and finally, adding an anti-aging agent, and shearing and stirring to obtain the flame-retardant modified asphalt. The recycled PC plastic and PVB are creatively used for synergistic modification of the asphalt, and the comprehensive performance of the asphalt is remarkably improved. In addition, the recycling of the waste PC not only contributes to reduction of environmental pollution, but also provides a new application approach for high-value utilization of the waste plastics. The flame-retardant modified asphalt has a wide application prospect in road construction, waterproof materials and other infrastructures, conforms to the concept of sustainable development and environmental protection, and has important social value and economic benefit.

Description

Technical Field

[0001] The invention relates to the technical field of asphalt modification, and in particular to a flame retardant modified asphalt based on PVB and recycled PC and a preparation method thereof. Background Art

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

[0003] However, despite the many advantages of asphalt, it still faces some problems that cannot be ignored during long-term use, especially the flammability and aging of asphalt. The flammability of asphalt is an important problem that needs to be solved urgently. Asphalt is easy to burn under high temperature or fire environment. In some places such as warehouses, parking lots, and building roofs in high temperature climates, the flammability of asphalt becomes a safety hazard. The toxic gases and smoke produced during the combustion process will not only pollute the environment, but also pose a serious threat to the safety of the surrounding people. In addition, when asphalt is exposed to environmental conditions such as ultraviolet rays and high temperatures, its molecular structure will degrade and oxidize, resulting in gradual degradation of physical properties, manifested as decreased adhesion, reduced toughness, surface cracking and peeling. Aged asphalt not only affects the flatness and aesthetics of the road, but also causes the road surface to be uneven, increasing traffic safety hazards. At the same time, the low-temperature embrittlement problem of asphalt is also particularly serious under cold climate conditions. Asphalt is prone to brittle cracking at low temperatures, causing road damage and affecting traffic flow. Therefore, how to effectively improve the flame retardancy, aging resistance and cracking resistance of asphalt has become an important topic in the field of asphalt modification technology.

[0004] As the global plastic pollution problem becomes increasingly serious, waste plastics have placed a huge burden on the environment. Plastic products are difficult to degrade in the natural environment. Long-term accumulation not only pollutes water, soil and air, but also poses a serious threat to ecosystems and biodiversity. According to a report by the United Nations, millions of tons of plastic waste are generated worldwide each year, and most of these plastic products eventually enter landfills, oceans and the natural environment in the form of waste, causing lasting environmental pollution. Therefore, how to efficiently and environmentally handle waste plastics and give them new utilization value has become the focus of global social attention.

[0005] The recycling of waste plastics not only helps reduce environmental pollution, but also provides a new idea for asphalt modification. Polycarbonate (PC), as a common engineering plastic, has excellent physical and chemical properties, especially in terms of fire resistance and weather resistance. Recycling it and applying it to asphalt modification can not only improve the performance of asphalt, but also achieve the effective reuse of plastic waste, taking into account both 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 the mechanical properties and thermal stability of asphalt. In addition, the film-forming property of PVB can effectively improve the crack resistance of asphalt, reduce surface cracking and cracking, and extend the service life of asphalt.

[0007] PVB and PC each have unique physical and chemical properties, and the two can play a synergistic effect in asphalt. When PVB and PC act together in asphalt, they can not only enhance the comprehensive performance of asphalt, but also enable it to maintain a longer service life under changing environmental conditions. Through this synergistic effect, modified asphalt shows significant advantages in flame retardancy, high and low temperature resistance, and aging resistance, and is particularly suitable for road construction and other infrastructure under complex environmental conditions such as high temperature, high humidity, and cold.

[0008] The present invention innovatively combines recycled PC plastic with PVB for the first time and applies them to asphalt modification, giving full play to the synergistic effect of the two to prepare a new type of flame-retardant modified asphalt. This innovative solution can not only effectively solve the flammability, aging resistance and cracking problems of asphalt, but also provide a new solution for the recycling of waste plastics, thereby promoting the development of environmental protection technology. The modified asphalt has high flame retardancy, excellent aging resistance and high and low temperature stability, and can be widely used in road construction, waterproof membranes, roofing materials and other fields, with important social value and economic benefits. Summary of the invention

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

[0010] In view of the deficiencies of the prior art, the present invention proposes a flame retardant modified asphalt based on polyvinyl butyral (PVB) and recycled polycarbonate (PC) and a preparation method thereof. By introducing PVB, the adhesion and crack resistance of the asphalt are significantly enhanced, while the excellent flame retardant properties of PC are utilized to improve the fire resistance of the asphalt. 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. In addition, the present invention also realizes the recycling and reuse of waste PC plastics, which not only solves the problem of plastic waste pollution, but also provides an innovative environmental protection solution for asphalt modification.

[0011] The technical solution of the present invention: a flame retardant modified asphalt based on PVB and recycled PC and a preparation method thereof, 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 by a crusher, 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; 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: (1) PVB and recycled PC were added into a pulverizer and pulverized at a voltage of 220 V and a power of 650 W, with a motor speed of 28,000 rpm to obtain PVB-PC composite powder; (2) Melting the base asphalt at 160-180°C; (3) Add PVB-PC composite powder and solubilizer to the molten matrix asphalt, mix and stir at 900-1100 rpm for 30-60 min; (4) Adding an anti-aging agent to the asphalt after stirring and swelling in step 3, performing shear stirring at 900-1100 rpm for 10-30 min, and cooling to room temperature to obtain the flame retardant modified asphalt.

[0016] The beneficial effects of the present invention are as follows: (1) By introducing recycled polycarbonate (PC) plastic, the flame retardant properties of asphalt are significantly improved, the fire risk is reduced, 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 prolongs its service life, especially in cold areas; (3) The synergistic effect of PVB and PC enables asphalt to be comprehensively improved in terms of flame retardancy, crack resistance, adhesion, etc., and improves its overall safety and durability, meeting the needs of modern infrastructure for high-performance materials; (4) Using waste PC plastic to modify asphalt not only effectively reduces environmental pollution, but also provides a new way for the recycling of waste plastics, and has significant environmental value; (5) Using recycled plastic to modify asphalt can reduce production costs, promote sustainable green industrial development, and has high economic benefits and social value. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the preparation process of the flame retardant modified asphalt of the present invention.

[0018] Figure 2 It is a graph showing the softening point test results of Example 1-2 and Comparative Example 1-2.

[0019] Figure 3 It is a graph showing the needle penetration test results of Example 1-2 and Comparative Example 1-2.

[0020] Figure 4 It is a graph of the ductility test results of Example 1-2 and Comparative Example 1-2.

[0021] Figure 5 It is a graph showing the limiting oxygen index test results of Example 1-2 and Comparative Example 1-2. DETAILED DESCRIPTION

[0022] 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.

[0023] Example 1: 10 g of PVB and 10 g of recycled PC plastic particles are added to a grinder and crushed at a voltage of 220 V and a power of 650 W, with a motor speed of 28,000 rpm to obtain a PVB-PC composite powder; 1 kg of 70# asphalt is melted at 160°C; the above-mentioned PVB-PC composite powder and 5 g of cyclodextrin are added to the molten asphalt, and the mixture is mixed and stirred at 1,000 rpm for swelling for 30 min; 10 g of tert-butylhydroquinone is added to the swollen asphalt, and the mixture is sheared and stirred at 1,000 rpm for 20 min, and then cooled to room temperature to obtain the flame retardant modified asphalt.

[0024] Example 2: The steps are the same as those described in Example 1, except that the amount of recycled PC plastic added is changed from 10 g to 15 g.

[0025] Comparative Example 1: The steps are the same as those described in Example 1, except that the amount of recycled PC plastic particles added is changed from 10 g to 0 g.

[0026] Comparative Example 2: The steps are the same as those described 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.

[0027] The schematic diagram of the preparation process of the flame retardant modified asphalt of the present invention is as follows Figure 1 As shown. Softening point, needle penetration and ductility are the three key indicators for evaluating asphalt performance. The softening point, needle penetration and ductility test results of Example 1-2 and Comparative Example 1-2 are shown as follows: Figure 2 , Figure 3 and Figure 4 As shown. 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 needle penetration indicates that the PVB-PC composite powder makes the asphalt more viscous and reduces the impact of temperature fluctuations on the fluidity of the asphalt. Figure 4 The data of medium ductility show that the addition of PVB-PC composite powder effectively improves the ductility of asphalt and enhances the deformation resistance of asphalt, while the improvement of ductility is mainly attributed to the addition of PVB, and the improvement effect of PC on ductility is not significant. The limiting oxygen index test results of Examples 1-3 and Comparative Examples 1-2 are shown in Figure 2. Figure 5 Analysis Figure 5 The data show that the limiting oxygen index of the flame retardant asphalt provided in Examples 1-2 of the present invention is significantly higher than that of the control example, and the flame retardant performance is effectively improved.

[0028] It can be seen from the above examples that the flame retardant modified asphalt based on PVB and recycled PC prepared by the present invention has good high temperature stability, adhesion, deformation resistance and flame retardancy, and the comprehensive performance of the modified asphalt is significantly improved. Compared with conventional technologies, the content of the present invention has significant technical progress.

Claims

1. A flame retardant modified asphalt based on PVB and recycled PC and a preparation method thereof, characterized in that: The invention comprises 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.

2. The flame retardant modified asphalt based on PVB and recycled PC and the preparation method thereof according to claim 1, characterized in that: The matrix asphalt is at least one of 70# asphalt and 90# asphalt.

3. The flame retardant modified asphalt based on PVB and recycled PC and the preparation method thereof according to claim 1, characterized in that: The PVB-PVC composite powder is a solid mixed powder obtained by crushing polyvinyl butyral PVB and recycled polycarbonate PC by a crusher, and the mass ratio of PVB to recycled PC is 1:1-2.

4. The flame retardant modified asphalt based on PVB and recycled PC and the preparation method thereof according to claim 1, characterized in that: The solubilizer is selected from one or more of cyclodextrin, phosphatidylcholine and povidone; the anti-aging agent is selected from one or more of p-phenylenediamine, tert-butylhydroquinone, butylated hydroxyanisole and triazole.

5. A flame retardant modified asphalt based on PVB and recycled PC and a preparation method thereof, characterized in that: The following steps are involved: S1, PVB and recycled PC are added into 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; S2, melting the base asphalt at 160-180°C; S3, adding PVB-PC composite powder and solubilizer to the molten matrix asphalt, mixing and stirring at 900-1100 rpm for 30-60 min; S4. Add an anti-aging agent to the asphalt after stirring and swelling in step S3, perform shear stirring at 900-1100 rpm for 10-30 min, and cool to room temperature to obtain the flame retardant modified asphalt.

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