A polyurethane-based solid-solid phase change temperature-regulating material for summer asphalt pavement applicable to multiple climate zones and its preparation method

Abstract

The present application provides a polyurethane-based solid-solid phase change temperature regulating material for summer asphalt pavements applicable to multiple climate zones and a preparation method thereof. The reaction raw materials include polyethylene glycol, isocyanate, and a curing agent. Among them, the molecular weight of polyethylene glycol is 10,000 and / or 20,000; the molar ratio of isocyanate to polyethylene glycol is (10-20):1; the molar ratio of the curing agent to isocyanate is 1:(6-12); the phase change temperature of the obtained polyurethane-based solid-solid phase change temperature regulating material is 37-54 °C and it remains in a completely solid state without leakage within 190 °C. The phase change temperature range of this PUSSPCM material is suitable for the use of summer asphalt pavements in different climate zones, and it can still maintain good anti-leakage performance under the high-temperature construction environment of asphalt pavements. This PUSSPCM can not only ensure no leakage problems during the application process of asphalt pavements, but also be applicable to the effective temperature regulation of summer asphalt pavements in both the north and south of China at the same time.

Description

Technical Field

[0001] This application belongs to the field of phase change temperature regulating materials, and particularly relates to a polyurethane-based solid-solid phase change temperature regulating material for summer asphalt pavements applicable to multiple climate zones and a preparation method thereof. Background Art

[0002] Black asphalt pavements have a high absorption rate of solar radiation, resulting in the pavement temperature reaching over 60 °C in summer. The high pavement temperature not only induces pavement high-temperature diseases such as rutting, bumping, and bleeding, reducing the service life of the pavement, but also promotes the release of components such as alkanes, nitrogen hydrocarbons, and sulfur hydrocarbons in asphalt into the atmosphere, causing problems such as acid rain and smog. In addition, the high pavement temperature also increases the building energy consumption in urban areas and reduces the comfort of urban travel. Given the significant adverse effects of the high-temperature environment of summer asphalt pavements on the service life of the pavement itself and the environment, it is extremely necessary to take effective measures to regulate the temperature of summer asphalt pavements.

[0003] Phase change heat storage technology is an effective active temperature regulation technology and has become a hot research field for self-regulating asphalt pavements in recent years. However, traditional solid-liquid phase change materials not only significantly reduce the road performance of asphalt pavements but also gradually lose the temperature regulation effect on the pavement due to leakage problems. Therefore, the anti-leakage design of solid-liquid phase change materials is a key technology.

[0004] Currently, relevant research mainly focuses on the physical encapsulation of solid-liquid phase change materials, but it cannot solve the leakage problem during the use of asphalt pavements. The reason is that the prepared solid-liquid composite phase change materials do not change the essence of solid-liquid phase change, and the matrix materials therein (such as porous diatomite, porous graphite, microcapsule walls) are prone to cracking and even damage under the action of high-speed shearing of modified asphalt, construction rolling of asphalt mixtures, and vehicle loads on asphalt pavements, thereby causing leakage problems.

[0005] In contrast, the polyurethane-based solid-solid phase change material (PUSSPCM) encapsulated by chemical method can fundamentally solve the leakage problem in the application of asphalt pavement, but has received very little attention. PUSSPCM is usually a block copolymer formed by the alternating connection of hard segments (composed of isocyanate and curing agent) and soft segments (polyethylene glycol PEG). During the phase change process, the chemical bonds between the hard and soft segments and the hydrogen bonds in the hard segments jointly restrict the macroscopic flow of PEG, and then PEG undergoes a phase transition from a crystalline solid state to an amorphous solid state. It should be noted that the structure of PUSSPCM has a significant impact on its performance such as phase change temperature, phase change heat storage capacity, and leak resistance. The high-temperature scenario of asphalt pavement in summer puts forward specific requirements for the applicable PUSSPCM, mainly including: (1) PUSSPCM should not only show no leakage in the phase change temperature range, but also show no leakage in the high-temperature construction environment of asphalt pavement; (2) The melting temperature and crystallization temperature of PUSSPCM should be within a reasonable range to ensure that PUSSPCM can play the function of phase change endotherm during the high-temperature period of daytime in summer and then release the absorbed heat in time at night.

[0006] The leak resistance of the phase change material determines its applicability in the temperature regulation of asphalt pavement. There are inevitably leakage hazards in the asphalt pavement for the solid-liquid composite phase change material, while the polyurethane-based solid-solid phase change material (PUSSPCM) can fundamentally avoid the leakage problem. Among them, it is necessary to focus on solving the leak resistance of PUSSPCM in the high-temperature construction environment of asphalt pavement, and there has been no other report concerned by inventors. Therefore, through reasonable configuration, solving the leak resistance of PUSSPCM in the high-temperature construction environment of asphalt pavement is the first technical problem to be solved in this invention patent.

[0007] The structure of PUSSPCM has a significant impact on its performance such as phase change temperature, phase change heat storage capacity, and leak resistance. Therefore, on the basis of solving the first technical problem, it is also necessary to control the phase change temperature of PUSSPCM within a reasonable range. The current relevant research has focused on the melting temperature, while ignoring the crystallization temperature, resulting in the crystallization temperature of PUSSPCM being often too low to meet the use requirements. In view of this, through reasonable configuration, regulating the phase change temperature of PUSSPCM within a reasonable range is the second technical problem to be solved in this invention patent.

[0008] The application number is 201310739247.0, and the patent name is a method for preparing a linear polyurethane phase change energy storage material. Although this patent discloses the phase change temperature of its material and pays attention to the performance of the melting temperature and crystallization temperature of the material, the leak resistance of the material in the application to asphalt pavement and the high-temperature construction environment is not ideal.

[0009] The application number is 201810025916.0, and the patent name is "A Polyethylene Glycol / Hydroxypropyl Methylcellulose Solid-Solid Phase Change Material and Its Preparation Method". Although this patent pays attention to the leakage problem and only focuses on its anti-leakage performance within the phase change temperature range, it does not consider the anti-leakage performance at temperatures of 185 °C and above. When it is applied to asphalt pavements, the anti-leakage performance of the material is not ideal under high-temperature construction environments. Moreover, the melting temperature and crystallization temperature of this material are not within a reasonable range, making it difficult to meet the usage requirements. Summary of the Invention

[0010] To solve the above problems, this application proposes a polyurethane-based solid-solid phase change temperature-regulating material for summer asphalt pavements applicable to multiple climate zones. The reaction raw materials include polyethylene glycol (PEG), isocyanate, and curing agent;

[0011] The molecular weight of polyethylene glycol is 10,000 and / or 20,000;

[0012] The molar ratio of isocyanate to polyethylene glycol is (10 - 20):1;

[0013] The molar ratio of curing agent to isocyanate is 1:(6 - 12);

[0014] The phase change temperature of the obtained polyurethane-based solid-solid phase change temperature-regulating material is set at 37 - 54 °C and remains in a completely solid state without leakage within 190 °C.

[0015] The phase change temperature in this application is interpreted as: the melting temperature ≤ 54 °C, the crystallization temperature ≥ 37 °C, and the phase change temperature of the material is 37 - 54 °C.

[0016] Furthermore, in the reaction raw materials, the molecular weight of polyethylene glycol is 10,000, the molar ratio of isocyanate to polyethylene glycol is (10 - 12):1, and the phase change temperature of the obtained polyurethane-based solid-solid phase change temperature-regulating material is set at 37 - 49 °C and remains in a completely solid state without leakage within 190 °C.

[0017] Furthermore, in the reaction raw materials, the molecular weight of polyethylene glycol is 20,000, the molar ratio of isocyanate to polyethylene glycol is (10 - 20):1, and the phase change temperature of the obtained polyurethane-based solid-solid phase change temperature-regulating material is set at 42 - 54 °C and remains in a completely solid state without leakage within 190 °C.

[0018] Furthermore, the molecular weight of polyethylene glycol is 10,000 and 20,000, the compounding molar ratio of polyethylene glycol with a molecular weight of 10,000 to polyethylene glycol with a molecular weight of 20,000 is (0.1 - 5):1, the molar ratio of isocyanate to polyethylene glycol is (10 - 20):1, and the phase change temperature of the obtained polyurethane-based solid-solid phase change temperature-regulating material is 41 - 51 °C and remains in a completely solid state without leakage within 190 °C.

[0019] Furthermore, the isocyanate is diphenylmethane diisocyanate (MDI); the curing agent is one or more of 3,3'-dichloro-4,4'-diphenylmethanediamine (MOCA), 3,5-dimethylthiotoluenediamine (DMTDA), and 3,5-diethyltoluenediamine (DETDA).

[0020] Preferably, the molar ratio of the curing agent to MDI is 1:(8 - 10).

[0021] This application also provides a preparation method of a polyurethane-based solid-solid phase change temperature-regulating material for summer asphalt pavements applicable to multiple climate zones, and the steps are as follows: Add polyethylene glycol to a solvent to dissolve and obtain a polyethylene glycol solution; under a nitrogen protection atmosphere, add MDI to the polyethylene glycol solution and mix and react for 5 - 120 min, then add the curing agent and wait for 5 - 180 min, and then place the mixture in a vacuum environment to remove the solvent to obtain the polyurethane-based solid-solid phase change temperature-regulating material.

[0022] Furthermore, the solvent is one or more of N,N-dimethylformamide (DMF), dichloromethane (DCM), tetrahydrofuran (THF), and toluene;

[0023] The mass ratio of the solvent to polyethylene glycol is (5 - 10):1.

[0024] Furthermore, the reaction temperature is 75 - 85 °C.

[0025] Preferably, the reaction temperature is 80 °C.

[0026] This application also provides another preparation method of a polyurethane-based solid-solid phase change temperature-regulating material for summer asphalt pavements applicable to multiple climate zones, and the steps are as follows: Prepare by bulk polymerization method, and the steps are: Add polyethylene glycol and MDI, and stir and react at 75 - 85 °C under nitrogen protection for 5 - 120 min, and then add the curing agent and continue to stir and react for 5 - 180 min to obtain the polyurethane-based solid-solid phase change temperature-regulating material.

[0027] This application provides a specific application scenario of the material. Apply the polyurethane-based solid-solid phase change temperature-regulating material to the asphalt pavement, and add the polyurethane-based solid-solid phase change temperature-regulating material to the hot mix asphalt mixture to keep it in a completely solid state without leakage.

[0028] The polyurethane-based solid-solid phase change temperature-regulating material prepared by this application can give full play to the advantages of the material especially when used in summer asphalt pavements, and can be applicable to multiple climate zones.

[0029] Based on the measured data of the temperature change of summer asphalt pavements in the north and south of our country, this application proposes a reasonable phase change temperature range of PUSSPCM, and the designed PUSSPCM can meet the temperature-regulating requirements of summer asphalt pavements in the north and south of our country.

[0030] The present application can bring the following beneficial effects:

[0031] The phase change temperature range of the PUSSPCM material designed in this invention patent is suitable for the use of asphalt pavements in different climate zones in summer, and it can still maintain good leak resistance in the high-temperature construction environment of asphalt pavements. This PUSSPCM can not only ensure no leakage problems during the application process of asphalt pavements, but also be applicable to the effective temperature regulation of asphalt pavements in both the north and south of China in summer. Description of the Drawings

[0032] The drawings described herein are used to provide a further understanding of the present application and form a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation to the present application. In the drawings:

[0033] Figure 1 It is the measurement result of the temperature change of the surface layer of the local asphalt pavement in summer.

[0034] Figure 2 It is the test result of leak resistance.

[0035] Figure 3 It is a picture of the limited fluidity during the synthesis process. Detailed Embodiments

[0036] Unless otherwise specified, the reagents and instruments used in the following examples are all commercially available products.

[0037] The preparation method of the polyurethane-based solid-solid phase change temperature regulation material of the present application can use conventional synthesis methods. The following two preparation methods are listed in the present application:

[0038] Method 1: Solution polymerization method

[0039] The steps are as follows: Add polyethylene glycol to a solvent to dissolve and obtain a polyethylene glycol solution; under a nitrogen protection atmosphere, add MDI to the polyethylene glycol solution, mix and carry out a prepolymerization reaction; then add a curing agent to carry out a curing reaction, and place the mixture in a vacuum environment to remove the solvent to obtain a polyurethane-based solid-solid phase change temperature regulation material.

[0040] Method 2: Bulk polymerization method, that is, directly mix the raw materials without using a solution

[0041] The steps are as follows: Add polyethylene glycol and MDI, stir under nitrogen protection to carry out a prepolymerization reaction, and then add a curing agent to carry out a curing reaction to obtain a polyurethane-based solid-solid phase change temperature regulation material.

[0042] To show the technical effects of the present application, the detailed embodiments are as shown in Table 1 below:

[0043] Table 1 Process Parameters for the Preparation of Specific Embodiments

[0044]

[0045]

Characterization

[0046] Characterization means:

[0047] 1. A differential scanning calorimeter was used to measure the melting temperature, melting enthalpy, crystallization temperature, and crystallization enthalpy. The test method was as follows: Under nitrogen protection, the temperature was raised to 90 °C at a rate of 5 °C / min and held at this temperature for 5 min to eliminate the thermal history. Subsequently, the temperature was lowered to 0 °C at the same rate, held for 3 min, and then raised to 90 °C; the test results are shown in Table 2.

[0048] 2. Leakage resistance test: The sample was placed on a filter paper with strong water absorption, and then placed in an environment of 70 °C, 135 °C, and 190 °C for 2 hours respectively, and the water absorption of the filter paper was observed. If the filter paper showed water absorption, it represented material leakage, and if the filter paper showed no water absorption, it represented no material leakage. The test results are shown in Table 2 and the appendix Figure 2 。

[0049] Table 2 Test Results of Material Properties

[0050]

[0051] From the characterization results in Table 2, it can be analyzed that by controlling the ratio of polyethylene glycol molecular weight, isocyanate, polyethylene glycol, and curing agent in this application, the phase change temperature of the polyurethane-based solid-solid phase change temperature-regulating material obtained is 37 - 54 °C and it remains in a completely solid state without leakage within 190 °C.

[0052] In Examples 1 - 2 of the present invention, polyethylene glycol with a molecular weight of 10000 was simply used, and the molar ratio of isocyanate to polyethylene glycol was controlled at (10 - 12):1. The phase change temperature of the obtained polyurethane-based solid-solid phase change temperature-regulating material was set at 37 - 49 °C and it remained in a completely solid state without leakage within 190 °C.

[0053] In Examples 3 - 8 of the present invention, polyethylene glycol with a molecular weight of 20000 was simply used, and the molar ratio of isocyanate to polyethylene glycol was controlled at (10 - 20):1. The phase change temperature of the obtained polyurethane-based solid-solid phase change temperature-regulating material was set at 42 - 54 °C and it remained in a completely solid state without leakage within 190 °C.

[0054] The present invention also provides two technical solutions for compounding with different molecular weights. For example, in Examples 9-11, the compounding molar ratio of polyethylene glycol with a molecular weight of 10,000 and polyethylene glycol with a molecular weight of 20,000 is (0.1-5):1, and the molar ratio of isocyanate to polyethylene glycol is controlled at (10-20):1. The phase change temperature of the obtained polyurethane-based solid-solid phase change temperature-regulating material is 41-51°C, and it remains completely solid and leak-free within 190°C.

[0055] The melting temperature represents the starting temperature at which the material changes from an ordered solid state to a disordered solid state. When the ambient temperature rises to the melting temperature, the material absorbs heat to slow down the temperature rise of the asphalt pavement and reduce the rutting risk under high summer temperatures. By absorbing heat, it prevents the sudden drop in asphalt viscosity and improves the rutting resistance.

[0056] The crystallization temperature represents the starting temperature at which the material returns from a high-temperature disordered solid state to a low-temperature ordered solid state. When the ambient temperature drops to the crystallization temperature, the material releases the stored heat, delaying the sudden drop in pavement temperature and reducing the risk of low-temperature cracking in winter.

[0057] The melting temperature and the crystallization temperature are the core parameters for the polyurethane solid-solid phase change material to regulate the temperature on the asphalt pavement. The smaller the difference between the melting and crystallization temperatures (hysteresis width), the more beneficial it is to the energy utilization efficiency. And the material obtained by the present invention has a smaller hysteresis width, which can improve the energy utilization efficiency.

[0058] The larger the melting enthalpy, the more heat the material absorbs during heating, and the more significant the cooling effect on the environment; the larger the crystallization enthalpy, the more heat the material releases during cooling, and the stronger the heat preservation effect on the environment. Through the compounding of PEG10000 and PEG20000 in the present invention, the melting enthalpy and crystallization enthalpy of the materials obtained in Examples 9-11 will be significantly improved.

[0059] On the one hand, the increase in the hard segment content in PUSSPCM can effectively enhance the restriction on the thermal motion of the PEG chain segments, enabling the material to remain in a stable solid state at higher temperatures, thus significantly improving the anti-leakage performance.

[0060] On the other hand, the increase in the hard segment content will also inhibit the crystallization behavior of PEG, resulting in a decrease in the temperature required for PEG crystallization, that is, the overall crystallization temperature of the material moves down. At this time, if a low molecular weight PEG is selected, such as in Comparative Examples 2-3, its own crystallization temperature is already relatively low. After superimposing the inhibitory effect of the hard segment, the crystallization temperature of PUSSPCM will drop to a range that is difficult to meet the service temperature requirements of the summer asphalt pavement.

[0061] In contrast, high molecular weight PEG has a higher initial crystallization temperature and longer chain segments, which helps to retain appropriate crystallization ability even when inhibited by hard segments, so that the material can maintain a reasonable crystallization temperature while maintaining leak resistance. Only when the molecular weight of PEG is increased to 10,000 or more can PUSSPCM achieve an effective balance between crystallization temperature and leak resistance, meeting the dual requirements of heat energy storage and practical applications.

[0062] When the molar ratio of isocyanate to polyethylene glycol is too low, as shown in Comparative Examples 4-5 and Comparative Examples 7-8, the content of isocyanate is difficult to effectively limit the thermal movement of PEG molecular chains at 190 °C, and thus leakage problems occur in PUSSPCM. When the molar ratio of isocyanate to polyethylene glycol is too high, as shown in Comparative Examples 6 and Comparative Examples 9, the viscosity of the system increases too fast, and then problems of limited fluidity occur (as shown in the attachment). Figure 3 When MDI is in excess, during the reaction of MDI and PEG, the solution gradually thickens, resulting in problems of limited fluidity ("climbing rod" effect), which causes the synthesis process to be unable to continue.

[0063] When the molecular weight of PEG is too low, due to fluidity problems, as shown in Comparative Example 1, the sample cannot be successfully synthesized.

[0064] The curing agent and isocyanate jointly play a role in restricting the PEG molecular chain. When the content of the curing agent is too low, as shown in Comparative Example 10, the leak resistance of the synthesized PUSSPCM cannot meet the requirements. At the same time, when the content of the curing agent is too low, the short molecular chains of the prepolymer cannot be fully connected to form macromolecules, resulting in poor mechanical properties. When the content of the curing agent is too high, as shown in Comparative Example 11, it will also cause the problem of too rapid increase in system viscosity, resulting in the inability to continue the synthesis process.

[0065]

Material Application Demonstration

[0066] Shandong and Guangdong were respectively selected to measure the temperature changes on the surface layer of local asphalt pavements in summer. The results are as shown in the attachment: Figure 1 :

[0067] According to the measured results, in the attachment, the red curve represents the surface temperature of the road surface, and the orange curve represents the temperature at different depths of the asphalt pavement. Figure 1

[0068] Figure 1 From the attachment Figure 1It can be analyzed from this that the road surface temperature is always higher than the atmospheric temperature. The daytime temperature of the surface layer is higher than 54 °C, and the highest can reach nearly 60 °C, which is closely related to the high absorptivity of the black asphalt pavement to solar radiation. During the day, the air temperature decreases significantly with the decrease of the layer position, while the temperature at night shows the opposite trend, but the influence of the layer position on the night temperature is not obvious, and the lowest temperature is mainly concentrated in the range of 30 - 35 °C. In addition, due to the climate differences between Shandong and Guangdong, the daytime temperatures of the asphalt pavements are also different. Therefore, the phase change temperature of the phase change heat storage asphalt pavement material should be controlled between 35 - 60 °C.

[0069] The phase change temperature of the PUSSPCM obtained in this invention patent is in the range of 37 - 54 °C (the melting temperature ≤ 54 °C, the crystallization temperature ≥ 37 °C). Therefore, the PUSSPCM prepared by this invention can fully meet the temperature regulation requirements of asphalt pavements in summer in the north and south of our country.

[0070] In addition, the construction temperature of hot mix asphalt mixture in our country is usually in the range of 160 - 185 °C. The PUSSPCM of this invention patent still maintains good anti-leakage performance at 190 °C, and can fully achieve no leakage under the construction state of hot mix asphalt mixture in our country.

[0071] Each embodiment in this specification is described in a progressive manner. For the same and similar parts between each embodiment, reference can be made to each other, and the key point of each embodiment is to illustrate the differences from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can refer to the partial description of the method embodiment.

[0072] The above description is only for the embodiments of this application and is not intended to limit this application. For those skilled in the art, various changes and modifications can be made to this application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall be included within the scope of the claims of this application.

Claims

1. A polyurethane-based solid-solid phase change temperature regulating material for summer asphalt pavement applicable to multiple climate zones, characterized in that: The reaction raw materials include polyethylene glycol, isocyanate, and curing agent; the isocyanate is MDI; the curing agent is one or more of 3,3'-dichloro-4,4'-diphenylmethane diamine, 3,5-dimethylthiotoluene diamine, and 3,5-diethyltoluene diamine; The molecular weight of the polyethylene glycol is 10,000 and / or 20,000; When the molecular weight of the polyethylene glycol is 10,000, the molar ratio of the isocyanate to the polyethylene glycol is (10 - 12):1; when the molecular weight of the polyethylene glycol is 20,000 or the molecular weight of the polyethylene glycol is 10,000 and 20,000, the molar ratio of the isocyanate to the polyethylene glycol is (10 - 20):1; The molar ratio of the curing agent to the isocyanate is 1:(6 - 12); The phase change temperature of the obtained polyurethane-based solid-solid phase change temperature-regulating material is 37~54 °C and it remains in a completely solid state without leakage within 190 °C; The preparation method of the polyurethane-based solid-solid phase change temperature-regulating material is Method 1 or Method 2; The steps of Method 1 are as follows: Add polyethylene glycol to a solvent to dissolve it to obtain a polyethylene glycol solution; under a nitrogen protection atmosphere, add MDI to the polyethylene glycol solution and mix and react for 5~120 min, the reaction temperature is 75 - 85 °C, then add the curing agent and wait for 5~180 min, and then place the mixture in a vacuum environment to remove the solvent to obtain the polyurethane-based solid-solid phase change temperature-regulating material; Method 2 is prepared by bulk polymerization, and the steps are as follows: Add polyethylene glycol and MDI, stir and react at 75 - 85 °C under nitrogen protection for 5~120 min, and then add the curing agent and continue to stir and react for 5~180 min to obtain the polyurethane-based solid-solid phase change temperature-regulating material.

2. The polyurethane-based solid-solid phase change temperature-regulating material for summer asphalt pavement applicable to multiple climate zones according to claim 1, wherein: The molecular weight of the polyethylene glycol is 10,000 and 20,000, the molar ratio of the polyethylene glycol with a molecular weight of 10,000 to the polyethylene glycol with a molecular weight of 20,000 is (0.1 - 5):1, the molar ratio of the isocyanate to the polyethylene glycol is (10 - 20):1, and the phase change temperature of the obtained polyurethane-based solid-solid phase change temperature-regulating material is 41~51 °C and it remains in a completely solid state without leakage within 190 °C.

3. The polyurethane-based solid-solid phase change temperature regulating material for summer asphalt pavement applicable to multiple climate zones according to claim 1, wherein: The molar ratio of the curing agent to MDI is 1:(8 - 10).

4. The preparation method of the polyurethane-based solid-solid phase change temperature-regulating material according to any one of claims 1-3, characterized in that: Add polyethylene glycol to a solvent to dissolve it to obtain a polyethylene glycol solution; under a nitrogen protection atmosphere, add MDI to the polyethylene glycol solution and mix and react for 5~120 min, the reaction temperature is 75 - 85 °C, then add the curing agent and wait for 5~180 min, and then place the mixture in a vacuum environment to remove the solvent to obtain the polyurethane-based solid-solid phase change temperature-regulating material.

5. The preparation method according to claim 4, characterized in that: The solvent is one or more of N,N-dimethylformamide, dichloromethane, tetrahydrofuran, and toluene; The mass ratio of the solvent to the polyethylene glycol is (5 - 10):

1.

6. The preparation method of the polyurethane-based solid-solid phase change temperature regulating material according to any one of claims 1-3, characterized in that: Prepared by bulk polymerization, the steps are as follows: Add polyethylene glycol and MDI, stir and react at 75 - 85 °C under nitrogen protection for 5~120 min, and then add the curing agent and continue to stir and react for 5~180 min to obtain the polyurethane-based solid-solid phase change temperature-regulating material.

7. The polyurethane-based solid-solid phase change temperature regulating material according to any one of claims 1-3, or the polyurethane-based solid-solid phase change temperature regulating material prepared by the preparation method according to any one of claims 4-6, characterized in that: Apply the polyurethane-based solid-solid phase change temperature-regulating material to the asphalt pavement, and add the polyurethane-based solid-solid phase change temperature-regulating material to the hot mix asphalt mixture to keep it in a completely solid state without leakage.

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