CN119931373A

CN119931373A - A flame retardant modified asphalt based on PVB and recycled PC and preparation method thereof

Info

Publication number: CN119931373A
Application number: CN202510202421.0A
Authority: CN
Inventors: 陈强; 李贝贝; 刘芳; 赵波; 梁骁哲
Original assignee: China University of Petroleum East China
Current assignee: China University of Petroleum East China
Priority date: 2025-02-24
Filing date: 2025-02-24
Publication date: 2025-05-06

Abstract

The invention provides flame-retardant modified asphalt based on polyvinyl butyral (PVB) and recycled Polycarbonate (PC) and a preparation method thereof. According to the method, PVB and recovered PC are compounded and added into matrix asphalt, so that the flame retardant property, cohesiveness and high-low temperature stability of the asphalt are remarkably improved. The preparation method comprises the steps of firstly adding PVB and recovered PC into a pulverizer to prepare PVB-PC composite powder, secondly heating and melting matrix asphalt, then adding PVB-PC composite powder and a solubilizer into the melted matrix asphalt together to carry out mixing stirring and swelling, and finally adding an anti-aging agent to carry out shearing stirring to prepare the flame-retardant modified asphalt. The invention innovatively applies the recycled PC plastic and PVB to the synergistic modification of asphalt, and the comprehensive performance of the asphalt is obviously improved. In addition, the recycling of the waste PC is not only beneficial to reducing environmental pollution, but also provides a new application way for the high-value utilization of the waste plastics. The flame-retardant modified asphalt has wide application prospects in road construction, waterproof materials and other infrastructure, accords with the concepts of sustainable development and environmental protection, and has important social value and economic benefit.

Description

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

Technical Field

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

Background

Asphalt is used as an important building and road material and is widely applied to various fields such as highways, bridges, airport runways, parking lots, building waterproofing and the like. Along with the rapid development of infrastructure construction in China, the application range of asphalt is continuously expanded, and the importance is increasingly highlighted. Asphalt has excellent plasticity, binding force and waterproof performance, provides lasting and stable performance guarantee, and plays a vital role in the use of asphalt materials especially in large-scale road construction and transportation hubs.

However, despite the advantages of asphalt, it still faces some non-negligible problems during long-term use, especially flammability and aging problems of asphalt. Flammability of asphalt is an important issue to be addressed. Asphalt is easily burned under high temperature or fire environments. In places such as warehouses, parking lots, building roofs and the like under high-temperature climates, the inflammability of asphalt becomes a potential safety hazard, and toxic gases and smoke generated in the combustion process not only pollute the environment, but also can seriously threaten the safety of surrounding people. In addition, when asphalt is exposed to environmental conditions such as ultraviolet rays and high temperature, the molecular structure of the asphalt is degraded and oxidized, so that the physical properties of the asphalt are gradually degraded, and the asphalt is reduced in cohesiveness, reduced in toughness, cracked and peeled off surfaces and the like. The aged asphalt not only affects the flatness and the aesthetic degree of the road, but also causes the fluctuation of the road surface, and increases the traffic safety hidden trouble. Meanwhile, the problem of low-temperature embrittlement of asphalt is particularly serious under cold climate conditions, and the asphalt is easy to embrittle at low temperature, so that the road is damaged, and the traffic is influenced. Therefore, how to effectively improve the flame retardance, the ageing resistance and the crack resistance of asphalt has become an important subject in the technical field of asphalt modification.

With the increasing problem of global plastic pollution, waste plastics place a great burden on the environment. The plastic products are difficult to degrade in natural environment, and long-term accumulation not only pollutes water sources, soil and air, but also causes serious threat to ecosystems and biodiversity. According to united nations reports, plastic waste produced worldwide reaches millions of tons each year, and most of the plastic products enter landfill sites, oceans and natural environments in the form of waste at all, causing persistent environmental pollution. Therefore, how to efficiently and environmentally treat waste plastics and give new utility value to the waste plastics has become a focus of global social interest.

The recycling of the waste plastics is not only beneficial to reducing environmental pollution, but also provides a new idea for asphalt modification. Polycarbonate (PC) has excellent physicochemical properties as a common engineering plastic, and has significant advantages in fire and weather resistance in particular. The asphalt can be recycled and applied to asphalt modification, so that the asphalt performance can be hopefully improved, the plastic waste can be effectively recycled, and the environmental protection and economic benefits are considered.

Polyvinyl butyral (PVB) is a polymeric material that has excellent film forming properties, adhesion, and weather resistance. PVB is widely applied to the fields of automobile window glass, building glass and the like. PVB molecular structure contains abundant polar functional groups, and the functional groups can interact with asphalt molecules, so that the compatibility of asphalt is enhanced, and the mechanical property and the thermal stability of asphalt are improved. In addition, the film forming performance of PVB can effectively improve the cracking resistance of asphalt, reduce the cracking and cracking phenomena of the surface and prolong the service life of asphalt.

PVB and PC each possess unique physicochemical properties and are capable of exerting synergistic effects in asphalt. When PVB and PC work together in asphalt, they not only enhance the overall performance of the asphalt, but also allow it to maintain a longer service life under varying environmental conditions. Through the synergistic effect, the modified asphalt has remarkable advantages in the aspects of flame retardance, high and low temperature resistance, ageing resistance and the like, and is particularly suitable for road construction and other infrastructures under complex environmental conditions such as high temperature, high humidity, cold and the like.

The invention combines the recycled PC plastic with PVB creatively for the first time, is applied to asphalt modification, and exerts the synergistic effect of the recycled PC plastic and PVB to prepare the novel flame-retardant modified asphalt. The innovative scheme not only can effectively solve the problems of flammability, ageing resistance and cracking of asphalt, but also can provide a new solving way for recycling waste plastics, thereby promoting the development of environmental protection technology. The modified asphalt has higher flame retardance, excellent ageing resistance and high-low temperature stability, can be widely applied to the fields of road construction, waterproof coiled materials, roof materials and the like, and has important social value and economic benefit.

Disclosure of Invention

The invention aims to provide flame-retardant modified asphalt based on PVB and recycled PC and a preparation method thereof, the PVB and the recovered PC are compounded and applied to matrix asphalt modification to prepare the modified asphalt with high flame retardance, ageing resistance and high-low temperature stability.

Aiming at the defects of the prior art, the invention provides flame-retardant modified asphalt based on polyvinyl butyral (PVB) and recycled Polycarbonate (PC) and a preparation method thereof. By introducing PVB, the cohesiveness and crack resistance of the asphalt are obviously enhanced, and meanwhile, the flame resistance of the asphalt is improved by utilizing the excellent flame retardant property of PC. The synergistic effect of PVB and PC not only effectively improves the high-low temperature stability of asphalt, but also remarkably prolongs the service life of asphalt. In addition, the invention realizes the recovery and reutilization of waste PC plastic, solves the problem of plastic waste pollution, and provides an innovative environment-friendly scheme for asphalt modification.

The technical scheme of the invention comprises the following raw materials, by weight, 100 parts of matrix asphalt, 1-8 parts of PVB-PC composite powder, 0.5-10 parts of a solubilizer and 0.5-3 parts of an anti-aging agent.

The flame-retardant modified asphalt based on PVB and recycled PC and the preparation method thereof are characterized in that the matrix asphalt is at least one of 70# asphalt or 90# asphalt.

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

The flame-retardant modified asphalt based on PVB and recycled PC and the preparation method thereof 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, tertiary butyl hydroquinone, butyl hydroxy anisole and triazole.

The flame-retardant modified asphalt based on PVB and recycled PC and the preparation method thereof are characterized by comprising the following steps:

(1) Adding PVB and recovered PC into a pulverizer, pulverizing under the voltage of 220V and the power of 650W, and obtaining PVB-PC composite powder, wherein the motor rotating speed is 28000 rpm;

(2) Melting the matrix asphalt at 160-180 ℃;

(3) Adding PVB-PC composite powder and a solubilizer into the melted matrix asphalt, and mixing and stirring for swelling for 30-60min under 900-1100 rpm;

(4) Adding an anti-aging agent into the asphalt subjected to stirring and swelling in the step 3, shearing and stirring at 900-1100 rpm ℃ for 10-30 min, and cooling to room temperature to obtain the flame-retardant modified asphalt.

The invention has the advantages that (1) the flame retardant property of asphalt is obviously improved by introducing recycled Polycarbonate (PC) plastic, the fire hazard risk is reduced, the invention is particularly suitable for places needing high safety, (2) the adhesive property and crack resistance of asphalt are enhanced by adopting polyvinyl butyral (PVB), the high-low temperature performance of the asphalt is improved, the service life is prolonged, and the invention is especially superior in cold areas, (3) the synergistic effect of PVB and PC comprehensively improves the flame retardance, crack resistance, adhesion and the like of the asphalt, the overall safety and durability of the asphalt are improved, the invention is suitable for the requirements of modern infrastructure on high-performance materials, and (4) the asphalt is modified by utilizing waste PC plastic, thereby not only effectively reducing environmental pollution, but also providing a new way for recycling waste plastic, having obvious environmental protection value, (5) the production cost can be reduced by adopting recycled plastic modified asphalt, sustainable green industrial development is promoted, and the invention has higher economic benefit and social value.

Drawings

FIG. 1 is a schematic diagram of the preparation process of the flame retardant modified asphalt of the invention.

FIG. 2 is a graph showing the results of the softening point test of examples 1-2 and comparative examples 1-2.

FIG. 3 is a graph showing the results of penetration tests of examples 1-2 and comparative examples 1-2.

FIG. 4 is a graph showing the results of the ductility test of examples 1-2 and comparative examples 1-2.

FIG. 5 is a graph showing the results of limiting oxygen index tests of examples 1-2 and comparative examples 1-2.

Detailed Description

The operation and effect of the method of the present invention will be further illustrated by the following examples, but is not limited thereto.

Example 1. Adding 10 g PVB and 10 g recycled PC plastic particles into a pulverizer, pulverizing under the voltage of 220V and the power of 650W, obtaining PVB-PC composite powder at the motor rotation speed of 28000 and rpm, melting 1 kg of 70# asphalt at 160 ℃, adding the PVB-PC composite powder and 5g cyclodextrin into the melted asphalt, mixing and stirring for swelling for 30 min at 1000 rpm, adding 10 g tertiary butyl hydroquinone into the swelled asphalt, shearing and stirring for 20min at 1000 rpm, and cooling to room temperature to obtain the flame retardant modified asphalt.

Example 2 the procedure was as described in example 1, except that the amount of recycled PC plastic added was changed from 10 g to 15 g.

Comparative example 1 the procedure was as described in example 1, except that the addition amount of the recovered PC plastic particles was changed from 10g to 0g.

Comparative example 2 the procedure was as described in example 1, except that the PVB addition was changed from 10 g to 0 g and the recycled PC plastic particles were changed from 10 g to 0 g.

A schematic diagram of the preparation process of the flame-retardant modified asphalt is shown in figure 1. Softening point, penetration and ductility are three key indicators for evaluating asphalt performance. The softening point, penetration and ductility test results for examples 1-2 and comparative examples 1-2 are shown in fig. 2, 3 and 4, respectively. As can be seen from fig. 2, the addition of the PVB-PC composite powder effectively increases the softening point of the asphalt, enhancing its cohesiveness and plasticity at high temperatures. As can be seen from fig. 3, the reduced penetration indicates that the PVB-PC composite powder made the asphalt more viscous, reducing the impact of temperature fluctuations on asphalt flowability. The ductility data in fig. 4 show that the addition of the PVB-PC composite powder effectively increases the ductility of the asphalt, enhancing the deformation resistance of the asphalt, while the increase in ductility is mainly due 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 FIG. 5. As can be seen from analysis of the data in FIG. 5, the flame retardant asphalt provided in examples 1-2 of the present invention has significantly improved limiting oxygen index compared with the comparative examples, and has effectively improved flame retardant performance.

According to the embodiment, the flame-retardant modified asphalt based on PVB and recycled PC, which is prepared by the invention, has better high-temperature stability, cohesiveness, deformation resistance and flame retardance, and the comprehensive performance of the modified asphalt is obviously improved. Compared with the conventional technology, the invention has obvious technical progress.

Claims

1. A flame-retardant modified asphalt based on PVB and recycled PC and a preparation method thereof are characterized by comprising the following raw materials, by weight, 100 parts of matrix asphalt, 1-8 parts of PVB-PC composite powder, 0.5-10 parts of a solubilizer and 0.5-3 parts of an anti-aging agent.

2. The flame retardant modified asphalt based on PVB and recycled PC and its preparation method according to claim 1, wherein the matrix asphalt is at least one of 70# asphalt or 90# asphalt.

3. The flame-retardant modified asphalt based on PVB and recycled PC and the preparation method thereof according to claim 1, wherein the PVB-PVC composite powder is solid mixed powder obtained by crushing PVB of polyvinyl butyral and recycled PC of polycarbonate 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, wherein the solubilizer is one or more selected from cyclodextrin, phosphatidylcholine and povidone, and the antioxidant is one or more selected from p-phenylenediamine, tert-butylhydroquinone, butyl hydroxyanisole and triazole.

5. The flame-retardant modified asphalt based on PVB and recycled PC and the preparation method thereof are characterized by comprising the following steps:

S1, adding PVB and recovered PC into a pulverizer, and pulverizing under the voltage of 220V and the power of 650W, wherein the motor rotation speed is 28000 rpm, so as to obtain PVB-PC composite powder;

s2, melting the matrix asphalt at 160-180 ℃;

S3, adding PVB-PC composite powder and a solubilizer into the melted matrix asphalt, and mixing, stirring and swelling for 30-60min under 900-1100 rpm;

S4, adding an anti-aging agent into the asphalt subjected to stirring and swelling in the step S3, shearing and stirring at 900-1100 rpm for 10-30 min, and cooling to room temperature to obtain the flame-retardant modified asphalt.