A polymer-encapsulated solid waste-based phase change material, its preparation method, and its application in temperature-regulating asphalt.

Abstract

This invention discloses a polymer-coated solid waste-based phase change material, its preparation method, and its application in temperature-regulating asphalt, belonging to the technical field of asphalt pavement materials. The polymer-coated solid waste-based phase change material is composed of the following raw materials in the following weight ratio: 70-90 parts phase change material, 20-35 parts solid waste-based carrier material, and 10-25 parts shell material. The above-mentioned polymer-coated solid waste-based phase change material is mixed with a dispersant and petroleum asphalt to prepare a temperature-regulating asphalt. After the temperature-regulating asphalt of this invention is laid on the road surface and put into service, the phase change material fully utilizes the porous and supportive characteristics of the solid waste-based material, while expanding sustainable resource utilization pathways. Its integration reduces environmental impact and resource waste. This material undergoes a phase change reaction when the road surface heats up or cools down, thereby absorbing or releasing heat, achieving self-regulation of road temperature, and thus improving the service life and durability of the asphalt pavement.

Description

Technical Field

[0001] This invention relates to the field of asphalt pavement materials technology, and in particular to a polymer-encapsulated solid waste-based phase change material, its preparation method, and its application in temperature-regulating asphalt. Background Technology

[0002] Road infrastructure, especially highways, as a core component of road infrastructure, plays a vital role in global transportation development by connecting cities, transporting goods, and providing emergency services. Asphalt pavement, as a major type of pavement for high-grade highways, is widely used due to its advantages such as ease of maintenance, smooth driving, high safety, low noise, recyclability, and relatively low cost. However, asphalt, a major component of asphalt pavement, is a temperature-sensitive material. It softens easily at high temperatures and becomes brittle at low temperatures. Due to this temperature sensitivity, asphalt pavements are mainly susceptible to two types of damage during their service life: rutting caused by high temperatures and traffic loads, and thermal cracking under low-temperature conditions, resulting in pavement damage, especially in areas with drastic temperature fluctuations. Therefore, improving the type of asphalt is crucial for maintaining the quality of asphalt pavements and extending their lifespan.

[0003] With the development of global road infrastructure, the road materials industry has placed higher demands on the elasticity and durability of asphalt pavements. Phase change materials (PCMs), also known as phase change energy storage materials, are a special class of materials. Within a certain temperature range, namely the phase change temperature range, they can change their physical state, for example, from solid to liquid or from liquid to solid, absorbing, storing, or releasing a large amount of heat as latent heat, while their own temperature remains constant. This characteristic endows PCMs with unique thermal energy storage and temperature regulation capabilities, giving them broad application potential in many fields, including but not limited to solar energy utilization, power peak shaving, waste heat recovery, seasonal thermal and cold storage, food preservation, building insulation, thermal management of electronic devices, agriculture, and textiles and apparel. However, despite the widespread application of PCMs in these numerous fields, their potential applications in the highway transportation sector have not yet been fully researched and developed.

[0004] To improve the performance of asphalt pavements and reduce temperature-induced damage, researchers have been searching for new methods. Phase change materials (PCMs), as potential modifiers, can be added to asphalt binders to reduce thermal deformation of asphalt pavements. In asphalt pavements, PCMs typically absorb heat at high temperatures, thus lowering the pavement temperature, and release heat at low temperatures, helping to raise the pavement temperature and mitigate the formation of cold cracks. However, directly adding PCMs to asphalt can cause problems, such as affecting the colloidal stability and high-temperature performance of the asphalt. Therefore, the performance and stability of PCMs need to be comprehensively considered during the addition process to achieve optimal results. Summary of the Invention

[0005] The purpose of this invention is to provide a polymer-encapsulated solid waste-based phase change material, its preparation method, and its application in temperature-regulating asphalt, thereby solving the above-mentioned problems. After the temperature-regulating asphalt is laid on the road surface and put into service, the polymer-encapsulated solid waste-based phase change material can reduce the damage to the asphalt pavement caused by excessively high or low temperatures, thereby improving the service life and durability of the asphalt pavement.

[0006] To achieve the above objectives, the present invention discloses a polymer-encapsulated solid waste-based phase change material, wherein the polymer-encapsulated solid waste-based phase change material is composed of a phase change material, a carrier material, and a shell material, wherein the above raw materials are in the following proportions by weight: 70-90 parts of phase change material, 20-35 parts of carrier material, and 10-25 parts of shell material.

[0007] Preferably, the carrier material is any one of red mud, diatomaceous earth, steel slag, and furnace slag, and the shell material is any one of epoxy resin, vinyl resin, and amino-modified phenolic resin.

[0008] Preferably, the phase change material is any one of polyethylene glycol 2000, polyethylene glycol 4000, polyethylene with a carbon chain length of 30-40, and paraffin with a carbon chain length of 25-30.

[0009] The present invention also provides a method for preparing the above-mentioned polymer-encapsulated solid waste-based phase change material, comprising the following steps:

[0010] (1) Place the solid waste-based material in an oven and dry it thoroughly;

[0011] (2) The dry solid waste-based material is mechanically ground to make solid waste-based powder with a fineness of 30-70 mesh; then it is calcined and cooled to room temperature to obtain active solid waste-based powder as a carrier material.

[0012] (3) Take the phase change material and place it in an experimental container for water bath heating, keeping the temperature at 60°C, and then use magnetic stirring until the phase change material is completely melted.

[0013] (4) Introduce the molten phase change material in step (3) into the container of active solid waste powder in step (2) and mix. Then, perform vacuum impregnation in a vacuum drying oven, maintain an environment of 1 Pa, keep the temperature at 60°C, and impregnate for 4-6 hours.

[0014] (5) Place the mixture in (4) into a shearing device and stir at 150 r / min for 5-10 minutes. Add the outer shell material in three batches and continue stirring for 10 minutes.

[0015] (6) Place the mixture in (5) into a drying oven and dry for 2-4 hours. Then, use a shearing machine to cut it into particles with a fineness of 10-20 mesh to obtain polymer-coated solid waste-based phase change material.

[0016] This invention provides the application of the above-mentioned polymer-encapsulated solid waste-based phase change material in temperature-regulating asphalt. The polymer-encapsulated solid waste-based phase change material is mixed with dispersant and petroleum asphalt in a weight ratio of (5-20):(0.4-0.9):100 to obtain a temperature-regulating asphalt.

[0017] Preferably, the petroleum asphalt is 70# petroleum asphalt.

[0018] Preferably, the dispersant is any one of polyvinyl alcohol, fatty alcohol polyoxyethylene ether, and polyoxyethylene.

[0019] Preferably, the preparation of temperature-regulating asphalt includes the following steps:

[0020] S1. Heat the petroleum asphalt to 130-150℃ until it melts;

[0021] S2. Introduce the petroleum asphalt from S1 into the shearing equipment and stir it at a speed of 200 r / min for 3-5 minutes;

[0022] S3. Add the dispersant to the shearing device, maintain the temperature at 130-150℃, and stir at 200r / min for 10 minutes;

[0023] S4. Add the polymer-coated solid waste-based phase change material to the dispersant in S3, and continue stirring at 400 r / min for 15-20 minutes to obtain a temperature-regulating asphalt.

[0024] In industrial production, solid waste-based materials are a typical type of industrial solid waste, containing large amounts of red mud and other valuable components. Direct dumping or disposal of solid waste-based materials can harm the environment. However, they possess significant characteristics as carrier materials, including a porous morphology, remarkable high-temperature resistance, and the ability to enhance asphalt performance when added in appropriate amounts. This phase change asphalt encapsulates the phase change material within a carrier material, which is then added to the asphalt. This method helps prevent leakage of the phase change material and allows for uniform dispersion of the phase change material in the asphalt, thereby improving performance and stability. Furthermore, solid waste-based materials, as industrial waste, represent a sustainable resource utilization approach. Their integration reduces environmental impact and resource waste, resulting in an environmentally friendly and sustainable road asphalt variety.

[0025] Therefore, the present invention has the following beneficial effects:

[0026] (1) The polymer-coated solid waste-based phase change material of the present invention has developed the application of phase change material in the field of highway transportation, and the polymer coating effectively prevents the leakage of phase change material, realizes the uniform dispersion of phase change material in asphalt, thereby improving the temperature regulation performance.

[0027] (2) In industrial production, solid waste-based materials are a typical type of industrial solid waste, and direct dumping or disposal can harm the environment. Fully utilizing them reduces environmental damage and resource waste, achieving sustainable resource utilization. Solid waste-based materials are porous, and grinding and calcining them can connect their internal pores, increasing their specific surface area, thus allowing them to support more phase change materials. During phase change, the porous nature of solid waste-based materials can serve as a skeletal support, enhancing the performance of the asphalt itself.

[0028] (3) The present invention uses advanced polymer coating technology to combine solid waste materials with phase change materials, and enhances the structural stability of the materials through polymer coating. The coating effectively reduces the temperature sensitivity of asphalt, reduces the occurrence of diseases, improves the self-regulation ability of road surface temperature, and also greatly improves the high temperature resistance to rutting and low temperature resistance of road surface.

[0029] The technical solution of the present invention will be further described in detail below through embodiments. Detailed Implementation

[0030] The technical solution of the present invention will be further described below through examples and embodiments.

[0031] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains.

[0032] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be appropriately combined to form other embodiments that can be understood by those skilled in the art. These other embodiments are also covered within the scope of protection of this invention.

[0033] Example 1

[0034] This embodiment provides a method for preparing a polymer-coated solid waste-based phase change material, as shown below:

[0035] The polymer-coated solid waste-based phase change material consists of a phase change material, a carrier material, and a shell material. The phase change material PEG-4000 is weighed out in 80 parts by weight, the carrier material red mud is weighed out in 25 parts by weight, and the shell material epoxy resin is weighed out in 15 parts by weight.

[0036] Prepare solid waste-based phase change bitumen according to the following steps:

[0037] (1) Place the solid waste-based material in an oven and dry it thoroughly;

[0038] (2) The dry solid waste-based material is mechanically ground to make solid waste-based powder with a fineness of 50 mesh; then it is calcined and cooled to room temperature to obtain active solid waste-based powder as a carrier material.

[0039] (3) Take the phase change material and place it in an experimental container for water bath heating, keeping the temperature at 60°C, and then use magnetic stirring until the phase change material is completely melted.

[0040] (4) Introduce the molten material from step (3) into a solid waste-based powder container and mix it. Then, perform vacuum impregnation in a vacuum drying oven, maintain an environment of 1 Pa, keep the temperature at 60°C, and impregnate for 5 hours.

[0041] (5) Place the mixture in (4) into a shearing device and stir at a speed of 150 r / min for 8 minutes. Add the outer shell material in three batches and continue stirring for 10 minutes.

[0042] (6) Place the mixture in (5) into a drying oven and dry for 3 hours. Then, use a shearing machine to cut it into particles with a fineness of 20 mesh to obtain polymer-coated solid waste-based phase change material.

[0043] The above-mentioned polymer-coated solid waste-based phase change material was combined with rosin resin and 70# petroleum asphalt in a ratio of 10:0.5:100 to synthesize a temperature-regulating asphalt. The specific steps are as follows:

[0044] (1) Heat 70# petroleum asphalt until it melts;

[0045] (2) Introduce the 70# petroleum asphalt from step (1) into the shearing equipment and stir it at a speed of 200 r / min for 5 minutes;

[0046] (3) Add rosin resin to the shearing device, keep it at 150°C, and stir at 200 r / min for 10 minutes;

[0047] (4) Add the polymer-coated solid waste-based phase change material to the mixture in step (3) and continue stirring at a speed of 400 r / min for 20 minutes to obtain temperature-regulating asphalt.

[0048] Example 2

[0049] This embodiment provides a method for preparing a polymer-coated solid waste-based phase change material, as shown below:

[0050] Weigh out 80 parts by weight of phase change material, 30 parts by weight of carrier material, and 15 parts by weight of shell material. The phase change material is PEG-4000; the carrier material is red mud; and the shell material is epoxy resin. Prepare solid waste-based phase change bitumen according to the following steps:

[0051] (1) Place the solid waste-based material in an oven and dry it thoroughly;

[0052] (2) The dry solid waste-based material is mechanically ground to make solid waste-based powder with a fineness of 50 mesh; then it is calcined and cooled to room temperature to obtain active solid waste-based powder as a carrier material.

[0053] (3) Take the phase change material and place it in an experimental container for water bath heating, keeping the temperature at 60°C, and then use magnetic stirring until the phase change material is completely melted.

[0054] (4) Introduce the molten material from step (3) into a solid waste-based powder container and mix it. Then, perform vacuum impregnation in a vacuum drying oven, maintain an environment of 1 Pa, keep the temperature at 60°C, and impregnate for 5 hours.

[0055] (5) Place the mixture in (4) into a shearing device and stir at 150 r / min for 10 minutes. Add the outer shell material in three batches and continue stirring for 10 minutes.

[0056] (6) Place the mixture in (5) into a drying oven and dry for 4 hours. Then, use a shearing machine to cut it into particles with a fineness of 20 mesh to obtain polymer-coated solid waste-based phase change material.

[0057] The above-mentioned polymer-coated solid waste-based phase change material was combined with rosin resin and 70# petroleum asphalt in a ratio of 10:0.5:100 to synthesize a temperature-regulating asphalt. The specific steps are as follows:

[0058] (1) Heat 70# petroleum asphalt until it melts;

[0059] (2) Introduce the 70# petroleum asphalt from step (1) into the shearing equipment and stir it at a speed of 200 r / min for 5 minutes;

[0060] (3) Add rosin resin to the shearing device, keep it at 130-150℃, and stir at 200r / min for 10 minutes;

[0061] (4) Add the polymer-coated solid waste-based phase change material to the mixture in step (3) and continue stirring at a speed of 400 r / min for 20 minutes to obtain temperature-regulating asphalt.

[0062] Example 3

[0063] This embodiment provides a method for preparing a polymer-coated solid waste-based phase change material, as shown below:

[0064] Weigh out 80 parts by weight of phase change material, 25 parts by weight of carrier material, and 15 parts by weight of shell material. The phase change material is PEG-2000; the carrier material is red mud; and the shell material is epoxy resin. Prepare solid waste-based phase change asphalt according to the following steps:

[0065] (1) Place the solid waste-based material in an oven and dry it thoroughly;

[0066] (2) The dry solid waste-based material is mechanically ground to make solid waste-based powder with a fineness of 50 mesh; then it is calcined and cooled to room temperature to obtain active solid waste-based powder as a carrier material.

[0067] (3) Take the phase change material and place it in an experimental container for water bath heating, keeping the temperature at 60°C, and then use magnetic stirring until the phase change material is completely melted.

[0068] (4) Introduce the molten material from step (3) into a solid waste-based powder container and mix it. Then, perform vacuum impregnation in a vacuum drying oven, maintain an environment of 1 Pa, keep the temperature at 60°C, and impregnate for 4 hours.

[0069] (5) Place the mixture in (4) into a shearing device and stir at 150 r / min for 5-10 minutes. Add the outer shell material in three batches and continue stirring for 10 minutes.

[0070] (6) Place the mixture in (5) into a drying oven and dry for 4 hours. Then, use a shearing machine to cut it into particles with a fineness of 15 mesh to obtain polymer-coated solid waste-based phase change material.

[0071] The above-mentioned polymer-coated solid waste-based phase change material was combined with rosin resin and 70# petroleum asphalt in a ratio of 10:0.5:100 to synthesize a temperature-regulating asphalt. The specific steps are as follows:

[0072] (1) Heat 70# petroleum asphalt until it melts;

[0073] (2) Introduce the 70# petroleum asphalt from step (1) into the shearing equipment and stir it at a speed of 200 r / min for 5 minutes;

[0074] (3) Add rosin resin to the shearing device, keep it at 145°C, and stir at 200 r / min for 10 minutes;

[0075] (4) Add the polymer-coated solid waste-based phase change material to the mixture in step (3) and continue stirring at a speed of 400 r / min for 20 minutes to obtain temperature-regulating asphalt.

[0076] Example 4

[0077] This embodiment provides a method for preparing a polymer-coated solid waste-based phase change material, as shown below:

[0078] Weigh out 80 parts by weight of phase change material, 30 parts by weight of carrier material, and 15 parts by weight of shell material. The phase change material is PEG-2000; the carrier material is red mud; and the shell material is epoxy resin. Prepare solid waste-based phase change asphalt according to the following steps:

[0079] (1) Place the solid waste-based material in an oven and dry it thoroughly;

[0080] (2) The dry solid waste-based material is mechanically ground to make solid waste-based powder with a fineness of 50 mesh; then it is calcined and cooled to room temperature to obtain active solid waste-based powder as a carrier material.

[0081] (3) Take the phase change material and place it in an experimental container for water bath heating, keeping the temperature at 60°C, and then use magnetic stirring until the phase change material is completely melted.

[0082] (4) Introduce the molten material from step (3) into a solid waste-based powder container and mix it. Then, perform vacuum impregnation in a vacuum drying oven, maintain an environment of 1 Pa, keep the temperature at 60°C, and impregnate for 5 hours.

[0083] (5) Place the mixture in (4) into a shearing device and stir at 150 r / min for 7 minutes. Add the outer shell material in three batches and continue stirring for 10 minutes.

[0084] (6) Place the mixture in (5) into a drying oven and dry for 3 hours. Then, use a shearing machine to cut it into particles with a fineness of 15 mesh to obtain polymer-coated solid waste-based phase change material.

[0085] The above-mentioned polymer-coated solid waste-based phase change material was combined with styrene resin and 70# petroleum asphalt in a ratio of 10:0.5:100 to synthesize a temperature-regulating asphalt. The specific steps are as follows:

[0086] (1) Heat 70# petroleum asphalt until it melts;

[0087] (2) Introduce the 70# petroleum asphalt from step (1) into the shearing equipment and stir it at a speed of 200 r / min for 4 minutes;

[0088] (3) Add styrene resin to the shearing device, keep it at 140°C, and stir at 200 r / min for 10 minutes;

[0089] (4) Add the polymer-coated solid waste-based phase change material to the mixture in step (3) and continue stirring at a speed of 400 r / min for 18 minutes to obtain temperature-regulating asphalt.

[0090] Comparative Example 1

[0091] This comparative example provides a method for preparing a polymer-coated solid waste-based phase change material, as shown below:

[0092] Weigh out 50 parts by weight of phase change material, 25 parts by weight of carrier material, and 15 parts by weight of shell material. The phase change material is PEG-4000; the carrier material is red mud; and the shell material is epoxy resin. Prepare solid waste-based phase change asphalt according to the following steps:

[0093] (1) Place the solid waste-based material in an oven and dry it thoroughly;

[0094] (2) The dry solid waste-based material is mechanically ground to make solid waste-based powder with a fineness of 50 mesh; then it is calcined and cooled to room temperature to obtain active solid waste-based powder.

[0095] (3) Take the phase change material and place it in an experimental container for water bath heating, keeping the temperature at 60°C, and then use magnetic stirring until the phase change material is completely melted.

[0096] (4) Introduce the molten material from step (3) into a solid waste-based powder container and mix it. Then, perform vacuum impregnation in a vacuum drying oven, maintain an environment of 1 Pa, keep the temperature at 60°C, and impregnate for 5 hours.

[0097] (5) Place the mixture in (4) into a shearing device and stir at a speed of 150 r / min for 8 minutes. Add the outer shell material in three batches and continue stirring for 10 minutes.

[0098] (6) Place the mixture in (5) into a drying oven and dry for 3 hours. Then, use a shearing machine to cut it into particles with a fineness of 20 mesh to obtain polymer-coated solid waste-based phase change material.

[0099] The above-mentioned polymer-coated solid waste-based phase change material was combined with rosin resin and 70# petroleum asphalt in a ratio of 10:0.5:100 to synthesize a temperature-regulating asphalt. The specific steps are as follows:

[0100] (1) Heat 70# petroleum asphalt until it melts;

[0101] (2) Introduce the 70# petroleum asphalt from step (1) into the shearing equipment and stir it at a speed of 200 r / min for 5 minutes;

[0102] (3) Add rosin resin to the shearing device, keep it at 150°C, and stir at 200 r / min for 10 minutes;

[0103] (4) Add the polymer-coated solid waste-based phase change material to the mixture in step (3) and continue stirring at a speed of 400 r / min for 20 minutes to obtain temperature-regulating asphalt.

[0104] Comparative Example 2

[0105] This comparative example provides a method for preparing a polymer-coated solid waste-based phase change material, as shown below:

[0106] Weigh out 80 parts by weight of phase change material, 30 parts by weight of carrier material, and 15 parts by weight of shell material. The phase change material is PEG-4000; the carrier material is clay; and the shell material is epoxy resin. Prepare solid waste-based phase change asphalt according to the following steps:

[0107] (1) Place the carrier material in an oven to dry thoroughly;

[0108] (2) The dry carrier material is mechanically ground into powder with a fineness of 50 mesh; then it is calcined and cooled to room temperature to obtain active powder.

[0109] (3) Take the phase change material and place it in an experimental container for water bath heating, keeping the temperature at 60°C, and then use magnetic stirring until the phase change material is completely melted.

[0110] (4) Introduce the molten material from step (3) into the powder container and mix it. Then, perform vacuum impregnation in a vacuum drying oven, maintain an environment of 1 Pa, keep the temperature at 60°C, and impregnate for 5 hours.

[0111] (5) Place the mixture in (4) into a shearing device and stir at 150 r / min for 10 minutes. Add the outer shell material in three batches and continue stirring for 10 minutes.

[0112] (6) Place the mixture in (5) into a drying oven and dry for 4 hours. Then, use a shearing machine to cut it into particles with a fineness of 20 mesh to obtain polymer-coated solid waste-based phase change material.

[0113] The above-mentioned polymer-coated solid waste-based phase change material was combined with rosin resin and 70# petroleum asphalt in a ratio of 10:0.5:100 to synthesize a temperature-regulating asphalt. The specific steps are as follows:

[0114] (1) Heat 70# petroleum asphalt until it melts;

[0115] (2) Introduce the 70# petroleum asphalt from step (1) into the shearing equipment and stir it at a speed of 200 r / min for 5 minutes;

[0116] (3) Add the rosin resin dispersant into the shearing device, keep it at 130-150℃, and stir at 200r / min for 10 minutes;

[0117] (4) Add the polymer-coated solid waste-based phase change material to the mixture in step (3) and continue stirring at a speed of 400 r / min for 20 minutes to obtain temperature-regulating asphalt.

[0118] Comparative Example 3

[0119] This comparative example provides a method for preparing a polymer-coated solid waste-based phase change material, as shown below:

[0120] Weigh out 80 parts by weight of phase change material and 25 parts by weight of carrier material. The phase change material is PEG-2000; the carrier material is red mud. Prepare solid waste-based phase change asphalt according to the following steps:

[0121] (1) Place the solid waste-based material in an oven and dry it thoroughly;

[0122] (2) The dry solid waste-based material is mechanically ground to make solid waste-based powder with a fineness of 50 mesh; then it is calcined and cooled to room temperature to obtain active solid waste-based powder.

[0123] (3) Take the phase change material and place it in an experimental container for water bath heating, keeping the temperature at 60°C, and then use magnetic stirring until the phase change material is completely melted.

[0124] (4) Introduce the molten material into a solid waste-based powder container and mix it. Then, perform vacuum impregnation in a vacuum drying oven, maintain an environment of 1 Pa, keep the temperature at 60°C, and impregnate for 4 hours.

[0125] (5) Place the mixture in (4) into a drying oven and dry for 4 hours. Then, use a shearing machine to cut it into particles with a fineness of 15 mesh to obtain polymer-coated solid waste-based phase change material.

[0126] The above-mentioned polymer-coated solid waste-based phase change material was combined with rosin resin and 70# petroleum asphalt in a ratio of 10:0.5:100 to synthesize a temperature-regulating asphalt. The specific steps are as follows:

[0127] (1) Heat 70# petroleum asphalt until it melts;

[0128] (2) Introduce the 70# petroleum asphalt from step (1) into the shearing equipment and stir it at a speed of 200 r / min for 5 minutes;

[0129] (3) Add rosin resin to the shearing device, keep it at 145°C, and stir at 200 r / min for 10 minutes;

[0130] (4) Add the polymer-coated solid waste-based phase change material to the mixture in step (3) and continue stirring at a speed of 400 r / min for 20 minutes to obtain temperature-regulating asphalt.

[0131] Comparative Example 4

[0132] This comparative example provides a method for preparing a polymer-coated solid waste-based phase change material, as shown below:

[0133] Weigh out 80 parts by weight of phase change material, 30 parts by weight of carrier material, and 15 parts by weight of shell material. The phase change material is PEG-2000; the carrier material is red mud; and the shell material is epoxy resin. Prepare solid waste-based phase change asphalt according to the following steps:

[0134] (1) Place the solid waste-based material in an oven and dry it thoroughly;

[0135] (2) The dry solid waste-based material is mechanically ground to make solid waste-based powder with a fineness of 50 mesh; then it is calcined and cooled to room temperature to obtain active solid waste-based powder.

[0136] (3) Take the phase change material and place it in an experimental container for water bath heating, keeping the temperature at 60°C, and then use magnetic stirring until the phase change material is completely melted.

[0137] (4) Introduce the molten material from step (2) into a solid waste-based powder container and mix it. Then, perform vacuum impregnation in a vacuum drying oven, maintain an environment of 1 Pa, keep the temperature at 60°C, and impregnate for 5 hours.

[0138] (5) Place the mixture in (3) in a shearing device and stir at 150 r / min for 7 minutes. Add the outer shell material in three batches and continue stirring for 10 minutes.

[0139] (6) Place the mixture in (4) into a drying oven and dry for 3 hours. Then, use a shearing machine to cut it into particles with a fineness of 15 mesh to obtain polymer-coated solid waste-based phase change material.

[0140] The above-mentioned polymer-coated solid waste-based phase change material was synthesized with styrene resin and 70# petroleum asphalt in a ratio of 10:0.2:100 to form a temperature-regulating asphalt. The specific steps are as follows:

[0141] (1) Heat 70# petroleum asphalt until it melts;

[0142] (2) Introduce the 70# petroleum asphalt from step (1) into the shearing equipment and stir it at a speed of 200 r / min for 4 minutes;

[0143] (3) Add styrene resin to the shearing equipment, keep it at 130-150℃, and stir at 200r / min for 10 minutes;

[0144] (4) Add the polymer-coated solid waste-based phase change material to the mixture in step (3) and continue stirring at a speed of 400 r / min for 18 minutes to obtain temperature-regulating asphalt.

[0145] Comparative Example 5

[0146] This comparative example provides a method for preparing a polymer-coated solid waste-based phase change material, as shown below:

[0147] The polymer-coated solid waste-based phase change material consists of a phase change material, a carrier material, and a shell material. 80 parts by weight of the phase change material, 25 parts by weight of the carrier material, and 15 parts by weight of the shell material are weighed. The phase change material is PEG-4000; the carrier material is red mud; and the shell material is epoxy resin. Solid waste-based phase change bitumen is prepared according to the following steps:

[0148] (1) Place the solid waste-based material in an oven and dry it thoroughly;

[0149] (2) The dry solid waste-based material is mechanically ground into solid waste-based powder with a fineness of 50 mesh.

[0150] (3) Take the phase change material and place it in an experimental container for water bath heating, keeping the temperature at 60°C, and then use magnetic stirring until the phase change material is completely melted.

[0151] (4) Introduce the molten material from step (2) into a solid waste-based powder container and mix it. Then, perform vacuum impregnation in a vacuum drying oven, maintain an environment of 1 Pa, keep the temperature at 60°C, and impregnate for 5 hours.

[0152] (5) Place the mixture in (3) in a shearing device and stir at a speed of 150 r / min for 8 minutes. Add the outer shell material in three batches and continue stirring for 10 minutes.

[0153] (6) Place the mixture in (4) into a drying oven and dry for 3 hours. Then, use a shearing machine to cut it into particles with a fineness of 20 mesh to obtain polymer-coated solid waste-based phase change material.

[0154] The above-mentioned polymer-coated solid waste-based phase change material was combined with rosin resin and 70# petroleum asphalt in a ratio of 10:0.5:100 to synthesize a temperature-regulating asphalt. The specific steps are as follows:

[0155] (1) Heat 70# petroleum asphalt until it melts;

[0156] (2) Introduce the 70# petroleum asphalt from step (1) into the shearing equipment and stir it at a speed of 200 r / min for 5 minutes;

[0157] (3) Add rosin resin to the shearing device, keep it at 150°C, and stir at 200 r / min for 10 minutes;

[0158] (4) Add the polymer-coated solid waste-based phase change material to the mixture in step (3) and continue stirring at a speed of 400 r / min for 20 minutes to obtain temperature-regulating asphalt.

[0159] To test the performance of temperature-regulating asphalt synthesized from polymer-coated solid waste-based phase change materials prepared in Examples 1-4 and Comparative Examples 1-5, the test methods in the "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering" (JTG E20-2011) were used. The test results are shown in Table 1.

[0160] Table 1 Test results of temperature-regulating asphalt

[0161]

[0162]

[0163] Based on the above test results, it can be concluded that: asphalt with a carrier material content of 30 parts exhibits better high-temperature and low-temperature performance (Example 1, Example 2); the phase change material PEG-4000 has a greater phase change potential than PEG-2000 (Example 1, Example 3); the phase change potential is greater and the temperature self-regulation ability is stronger when the phase change material content is 80 parts (Example 1, Comparative Example 1); the use of solid waste-based material red mud can effectively improve the high- and low-temperature performance of asphalt, and store more phase change material, resulting in stronger temperature self-regulation ability (Example 2, Comparative Example 2); polymer coating can reduce the leakage of phase change material and prevent the reduction of asphalt temperature self-regulation ability (Example 3, Comparative Example 3); increasing the amount of dispersant can ensure more uniform dispersion of phase change material, resulting in higher utilization rate and greater phase change potential (Example 4, Comparative Example 4); calcination of solid waste-based material helps to connect internal voids, increase its specific surface area, thereby loading more phase change material and improving the phase change potential of asphalt (Example 1, Comparative Example 5).

[0164] Therefore, this invention provides a polymer-encapsulated solid waste-based phase change material, its preparation method, and its application in temperature-regulating asphalt. After the temperature-regulating asphalt is laid on the road surface and put into service, the polymer-encapsulated solid waste-based phase change material can reduce the damage to the asphalt pavement caused by excessively high or low temperatures, thereby improving the service life and durability of the asphalt pavement.

[0165] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for preparing a polymer-encapsulated solid waste-based phase change material, characterized in that, The polymer-encapsulated solid waste-based phase change material is composed of a phase change material, a carrier material, and a shell material. The above raw materials are in the following proportions by weight: 70-90 parts of phase change material, 20-35 parts of carrier material, and 10-25 parts of shell material. The carrier material is any one of red mud, steel slag, and furnace slag, and the shell material is any one of epoxy resin, vinyl resin, and amino-modified phenolic resin. The phase change material is any one of polyethylene glycol 2000, polyethylene glycol 4000, and paraffin with a carbon chain length of 25-30. The preparation method of the polymer-encapsulated solid waste-based phase change material includes the following steps: (1) Place the solid waste-based material in an oven and dry it thoroughly; (2) The dry solid waste-based material is mechanically ground to make solid waste-based powder with a fineness of 30-70 mesh; then it is calcined and cooled to room temperature to obtain active solid waste-based powder as a carrier material; (3) Take the phase change material and place it in the experimental container for water bath heating, keep the temperature at 60°C, and then use magnetic stirring until the phase change material is completely melted; (4) The phase change material melted in step (3) is introduced into the active solid waste powder container in step (2) and mixed. Vacuum impregnation is carried out in a vacuum drying oven, maintaining an environment of 1 Pa and a temperature of 60°C for 4-6 hours. (5) Place the mixture in (4) in a shearing device and stir at 150 r / min for 5-10 minutes. Add the outer shell material in three batches and continue stirring for 10 minutes. (6) Place the mixture in (5) into a drying oven and dry for 2-4 hours. Then, use a shearing machine to cut it into particles with a fineness of 10-20 mesh to obtain polymer-coated solid waste-based phase change material.

2. The application of a polymer-encapsulated solid waste-based phase change material prepared by the method described in claim 1 in temperature-regulating asphalt, characterized in that, A temperature-regulating asphalt was prepared by mixing polymer-encapsulated solid waste-based phase change material with dispersant and petroleum asphalt in a weight ratio of (5-20):(0.4-0.9):

100.

3. The application according to claim 2, characterized in that, The petroleum asphalt is 70# petroleum asphalt.

4. The application according to claim 2, characterized in that, The dispersant is any one of polyvinyl alcohol, fatty alcohol polyoxyethylene ether, or polyoxyethylene.

5. The application according to claim 2, characterized in that, The preparation of temperature-regulating asphalt includes the following steps: S1. Heat the petroleum asphalt to 130-150℃ until it melts; S2. Introduce the petroleum asphalt from S1 into the shearing equipment and stir it at a speed of 200 r / min for 3-5 minutes; S3. Add the dispersant to the shearing device, maintain the temperature at 130-150℃, and stir at 200r / min for 10 minutes; S4. Add the polymer-coated solid waste-based phase change material to the dispersant in S3, and continue stirring at 400 r / min for 15-20 minutes to obtain a temperature-regulating asphalt.

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