Preparation of a high-viscosity self-temperature-regulating bio-based polyurethane pavement material and a curing method thereof

Abstract

The application discloses a kind of high viscosity self-temperature-adjusting bio-based polyurethane pavement material preparation and its health preservation method, belong to road engineering material technical field.The application first utilizes bio-based material to modify asphalt, improves the viscosity and stability of asphalt, then combines modified asphalt and bio-based polyurethane phase change material, significantly improves the viscosity, durability and temperature self-regulation ability of material, when it is used for pavement construction, can significantly enhance pavement anti-rutting and anti-cracking performance, also reduces energy consumption and production cost, reduces carbon emission, effectively prolongs the service life of pavement, solves the problem that existing phase change material mainly relies on petroleum-based raw materials, which is not consistent with the goal of sustainable development and the concept of green environmental protection.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of road engineering materials, and more particularly relates to a high-viscosity self-temperature-regulating bio-based polyurethane pavement material preparation and curing method thereof. BACKGROUND

[0002] In modern road engineering, with the continuous increase of traffic flow and vehicle load, traditional asphalt pavement materials face severe challenges such as insufficient durability, high-temperature deformation and low-temperature embrittlement. These problems not only shorten the service life of the road, but also frequently increase the maintenance demand, resulting in reduced traffic efficiency and safety. Therefore, developing more durable and high-performance modified asphalt materials has become a key direction of research. Modified asphalt usually enhances viscosity and stability by adding polymers, thereby improving its resistance to high-temperature deformation and low-temperature cracking. However, the widely used modified asphalt at present mostly relies on petroleum-based polymers, which not only increases the cost, but also consumes a large amount of energy in the production process, causing adverse effects on the environment. In addition, petroleum-based asphalt is sensitive to temperature changes and prone to aging under extreme weather conditions. For this reason, researchers have begun to explore the application of bio-based materials to reduce dependence on petroleum and reduce environmental burden.

[0003] Bio-based materials, as a renewable resource, exhibit unique advantages in asphalt modification. The chemical structure of vegetable oil can be used to synthesize self-crosslinking polyurethane, which can enhance the viscosity and stability of asphalt, thereby effectively prolonging the durability of the road. Compared with traditional petroleum-based materials, bio-based materials are not only renewable, but also have less pollution in the production process, which helps to reduce carbon emissions. However, the performance of bio-based materials in terms of high-temperature rut resistance, low-temperature crack resistance and long-term durability still needs to be improved. Extreme temperature changes can accelerate the aging and loss of asphalt materials. Phase change materials (PCMs) can absorb and release heat during temperature fluctuations, helping to alleviate the softening and rutting problems at high temperatures, as well as the cracking problems at low temperatures. However, current PCMs mainly rely on petroleum-based raw materials, which is not in line with the goal of sustainable development.

[0004] Therefore, it is of great significance to develop a green high-performance pavement material with excellent rut resistance, low-temperature crack resistance and long-term durability. SUMMARY

[0005] The purpose of the present application is to provide a high-viscosity self-temperature-regulating bio-based polyurethane pavement material preparation and curing method thereof, to solve the problem that the existing phase change materials mainly rely on petroleum-based raw materials, which is not in line with the goal of sustainable development and the concept of green environmental protection. The present application prepares a green high-performance pavement material by introducing a self-temperature-regulating bio-based polyurethane phase change material, which automatically adjusts the viscosity of asphalt when the temperature changes to enhance the rut resistance, releases heat at low temperatures to improve the low-temperature crack resistance and long-term durability.

[0006] To achieve the above object, the present application provides the following scheme:

[0007] One of the technical schemes of the present application: a high-viscosity self-temperature-adjusting bio-based polyurethane modified asphalt is provided, which comprises the following preparation raw materials in mass fraction: bio-based polyurethane phase change material 3-5 parts and bio-based polyurethane high-viscosity modified asphalt 90-110 parts.

[0008] The bio-based polyurethane high-viscosity modified asphalt comprises the following preparation raw materials in mass fraction: base asphalt 60-70 parts, bio-oil 10-20 parts, oligomeric polyol 0.5-1 part, chain extender 0.5-2 parts and isocyanate 15-25 parts.

[0009] Firstly, the bio-oil, oligomeric polyol, chain extender and isocyanate are used to modify the asphalt, so as to improve the viscosity and stability of the asphalt, and then the modified asphalt and the bio-based polyurethane phase change material are combined, so as to significantly improve the viscosity, durability and temperature self-adjusting ability of the material. When the material is used for road construction, the road rutting resistance and crack resistance can be significantly improved, the energy consumption and production cost are reduced, the carbon emission is reduced, the service life of the road is effectively prolonged, and the problem that the existing phase change material mainly depends on petroleum-based raw materials, which is not consistent with the goal of sustainable development and the concept of green environmental protection, is solved. In the present application, the bio-based polyurethane phase change material is also prepared by bio-oil, which is consistent with the concept of green environmental protection on the basis of significantly improving the material's rutting resistance and crack resistance.

[0010] Optionally, the bio-oil comprises one or more of castor oil, coconut oil and palm oil; the isocyanate comprises hexamethylene diisocyanate and / or hexamethylene diisocyanate; the chain extender comprises 1,4-butanediol and / or ethylene glycol; and the oligomeric polyol comprises polyoxypropylene glycol and / or polytetrahydrofuran diol.

[0011] Preferably, the bio-oil, chain extender and oligomeric polyol are dried before use to remove moisture; the drying temperature is independently 100-120℃, and the drying time is independently 2-3h.

[0012] Preferably, the bio-based polyurethane phase change material is prepared from bio-oil, isocyanate, chain extender and solvent, and specifically comprises the following steps:

[0013] The bio-oil is dissolved in the solvent to obtain a mixed solution; the isocyanate is first added to the mixed solution for pre-polymerization, and then the chain extender is added for chain extension reaction; after the reaction is completed, the product is dried to obtain the bio-based polyurethane phase change material.

[0014] The biological oil comprises one or more of castor oil, coconut oil, and palm oil; the isocyanate comprises hexamethylene diisocyanate and / or hexamethylene diisocyanate; the chain extender comprises 1,4-butanediol and / or ethylene glycol; and the solvent comprises N,N-dimethylformamide.

[0015] Similarly, the biological oil and the chain extender are dried before preparation of the bio-based polyurethane phase change material to remove moisture; the drying temperature is independently 100-120 DEG C, and the drying time is independently 2-3 h.

[0016] Preferably, the isocyanate index is R=1 during preparation of the bio-based polyurethane phase change material.

[0017] Preferably, the molar ratio of unreacted -NCO in the prepolymer obtained by the prepolymerization and -OH in the chain extender is 1:1.

[0018] Preferably, in the bio-based polyurethane phase change material, the mass ratio of the biological oil to the solvent is 1:8-12, and the molar ratio of -OH in the biological oil, -NCO in the isocyanate, and -OH in the chain extender is 1:4-6:3-5; the dissolving temperature is 50-60 DEG C, and the stirring speed during dissolving is 100-150 r / min; the prepolymerization is performed in a protective gas atmosphere, the prepolymerization temperature is 60-80 DEG C, the prepolymerization stirring speed is 100-150 r / min, and the prepolymerization time is 3-4 h; the chain extension reaction is performed in a protective gas atmosphere, the chain extension reaction temperature is 60-80 DEG C, the chain extension reaction stirring speed is 100-150 r / min, and the chain extension reaction time is 2-3 h; the protective gas comprises nitrogen; the drying temperature is 95-110 DEG C, and the drying time is 48-52 h; and the particle size of the bio-based polyurethane phase change material is ≤0.075 mm.

[0019] The second technical scheme of the present application provides a preparation method of the high-viscosity self-temperature-regulating bio-based polyurethane modified asphalt, comprising the following steps:

[0020] According to a specified amount, biological oil, oligomeric polyol, and chain extender are added to preheated base asphalt for first mixing, then bio-based polyurethane phase change material is added for second mixing, and finally isocyanate is added for third mixing, to obtain the high-viscosity self-temperature-regulating bio-based polyurethane modified asphalt.

[0021] Preferably, the temperature of the preheated base pitch is 130-140 DEG C; the temperature of the first mixing is 100-120 DEG C, the stirring speed of the first mixing is 300-500 r / min, and the time of the first mixing is 10-15 min; the temperature of the second mixing is 100-120 DEG C, the stirring speed of the second mixing is 500-700 r / min, and the time of the second mixing is 5-10 min; the temperature of the third mixing is 130-140 DEG C, the stirring speed of the third mixing is 700-800 r / min, and the time of the third mixing is 15-20 min.

[0022] The present application can ensure that the bio-based polyurethane phase change material can be fully dispersed in the asphalt phase after the introduction of isocyanate, and then form a polyurethane network structure; in addition, by controlling the temperature of each mixing stage, the reaction can be ensured to be complete and form a polyurethane network structure while preventing thermal degradation; in addition, controlling the stirring speed and mixing time is also crucial for achieving uniform distribution of each component.

[0023] The present application prepares a green high-viscosity self-temperature-regulating bio-based polyurethane modified asphalt, by introducing a self-temperature-regulating bio-based polyurethane phase change material, the asphalt can automatically adjust the viscosity to enhance the anti-rutting performance when the temperature changes, and the phase change material releases heat at low temperature to improve the low-temperature crack resistance and long-term durability.

[0024] The third technical scheme of the present application provides an application of the high-viscosity self-temperature-regulating bio-based polyurethane modified asphalt in the preparation of a high-viscosity self-temperature-regulating bio-based polyurethane pavement material.

[0025] The fourth technical scheme of the present application provides a high-viscosity self-temperature-regulating bio-based polyurethane pavement material, which comprises mineral aggregates and the high-viscosity self-temperature-regulating bio-based polyurethane modified asphalt.

[0026] The oil-stone ratio of the high-viscosity self-temperature-regulating bio-based polyurethane pavement material is 5.5-8%.

[0027] The fifth technical scheme of the present application provides a preparation method of the high-viscosity self-temperature-regulating bio-based polyurethane pavement material, which comprises the following steps:

[0028] The high-viscosity self-temperature-regulating bio-based polyurethane modified asphalt and the preheated mineral aggregates are mixed, and then sequentially formed and cured to obtain the high-viscosity self-temperature-regulating bio-based polyurethane pavement material.

[0029] Preferably, the temperature of the mineral aggregate preheating is 100-110 DEG C, the time of the mineral aggregate preheating is 4-4.5 h; the temperature of the mixing is 120-130 DEG C, the time of the mixing is 130-150 s; the curing includes a curing initial stage and a curing later stage, and the parameters of the curing are set as follows: the temperature of the curing initial stage is 100-130 DEG C, the time of the curing initial stage is 7-8 h, the temperature of the curing later stage is 20-30 DEG C, and the time of the curing later stage is 24-48 h.

[0030] Preferably, the forming is a compaction forming, and the compaction times of the two sides are 84-86 times.

[0031] The present application can effectively adjust the adhesion of asphalt and mineral aggregate by controlling the oil-stone ratio, mixing parameters and curing parameters, ensure that the asphalt and mineral aggregate are uniformly mixed under the best conditions, and accelerate the complete reaction of high-viscosity self-temperature-adjusting bio-based polyurethane modified asphalt to enhance its water damage resistance and aging resistance, and the high-viscosity self-temperature-adjusting bio-based polyurethane modified asphalt itself ensures that the obtained pavement material has high anti-rutting, low-temperature crack resistance and long-term durability.

[0032] The present application has the following technical effects:

[0033] 1. Temperature self-regulation function: bio-based polyurethane phase change material has temperature self-regulation function, can absorb heat at high temperature and release heat at low temperature, and when combined with high-viscosity bio-based polyurethane modified asphalt to prepare pavement material, it can reduce high-temperature rutting and low-temperature cracking, and prolong the service life of the pavement material;

[0034] 2. High viscosity and anti-deformation ability: bio-based polyurethane high-viscosity modified asphalt enhances the anti-deformation performance of the pavement material, ensuring stability at high temperature and preventing rutting;

[0035] 3. Low-temperature crack resistance: bio-based polyurethane phase change material improves the fracture strength and energy absorption capacity of the pavement material at low temperature, which can effectively prevent low-temperature cracking of the pavement material;

[0036] 4. Optimization of thermal conductivity: high-viscosity self-temperature-adjusting bio-based polyurethane modified asphalt has a low thermal conductivity, which can slow down the material heating speed, reduce temperature fluctuations, and improve the stability of the pavement material at high temperature;

[0037] 5. Environmental protection and sustainability: high-viscosity self-temperature-adjusting bio-based polyurethane modified asphalt uses bio-based raw materials such as castor oil, reduces dependence on petroleum, reduces carbon emissions, and meets green environmental protection requirements;

[0038] 6. High performance and durability: By modifying asphalt with bio-based polyurethane, the viscosity, compatibility and dispersibility of bio-based polyurethane high viscosity modified asphalt are improved, which makes it perform excellently in terms of anti-rutting, anti-cracking and anti-thermal stress, and is suitable for application in pavement material preparation under extreme weather conditions. BRIEF DESCRIPTION OF DRAWINGS

[0039] Figure 1 Flow chart of preparation of bio-based polyurethane phase change material, high viscosity self-temperature regulating bio-based polyurethane modified asphalt and high viscosity self-temperature regulating bio-based polyurethane pavement material for examples. DETAILED DESCRIPTION

[0040] The various illustrative embodiments of the present application will now be described in detail below. This description is not intended to be a limitation on the present application, but rather a description of certain aspects, features, and embodiments of the present application. Variations and modifications can be made to the illustrative embodiments within the scope of the present application.

[0041] It should be understood that the terms used herein are for the purpose of describing particular embodiments and are not intended to limit the present application. In addition, for numerical ranges recited in the present application, it is contemplated that every numerical value within the range is specifically recited. Every narrower range that falls within a broader range recited in the present application is also specifically recited. The upper and lower limits of these smaller ranges can independently be included or excluded in the range.

[0042] Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. Although preferred methods and materials are described herein, any methods and materials similar or equivalent to those described herein can be used in the practice or testing of the present application. All documents mentioned herein are incorporated by reference to disclose and describe the methods and / or materials in connection with which the documents are cited. In case of conflict between the content of the specification and that of any document incorporated herein by reference, the content of the specification prevails.

[0043] Many modifications and variations of the present application described in the specification are possible without departing from the scope or spirit of the present application. Other implementations of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. The specification and examples given are exemplary only. It is intended to include all alternatives, modifications and equivalents falling within the scope of the present application.

[0044] As used herein, the terms "comprise", "comprising", "include", "including", "have", "having" and the like are open-ended and do not exclude additional elements or steps.

[0045] The mineral aggregate used in the following examples and comparative examples is AC-13 type graded, as shown in Table 1.

[0046] Table 1 AC-13 type grading of each sieve size and corresponding passing percentage

[0047] Mesh size (mm) 16 13.2 9.5 4.75 2.36 1.18 0.6 0.3 0.15 0.075 By percentage (%) 100 95 76.5 53 37 26.5 19 13.5 10 6

[0048] The used part raw materials and their purchase sources are shown in Table 2.

[0049] Table 2 Raw materials and their purchase sources

[0050]

[0051] The other raw materials are all commercially available products, and the manufacturers and models of commercially available products do not affect the performance of the obtained materials.

[0052] The normal temperature involved in the present application is 25±5℃, unless otherwise specified.

[0053] Examples 1-3

[0054] Examples 1-3 provide the preparation of the bio-based polyurethane phase change material, and the specific steps are as follows:

[0055] S1, the weighed castor oil and 1,4-butanediol are dehydrated at 120℃ for 2.5h under vacuum to remove moisture.

[0056] S2, a three-necked round-bottom flask is used as the reaction container, and nitrogen is introduced during the synthesis process. N,N-dimethylformamide (its mass is 10 times the mass of castor oil) is added to the reaction container, and then castor oil is added, which is stirred and dissolved at a temperature of 50℃ and a stirring rate of 150r / min. Then hexamethylene diisocyanate (added according to isocyanate index R=1) is added, which is stirred at a temperature of 80℃ and a stirring rate of 120r / min for 3h to generate a polyurethane prepolymer. Finally, dehydrated 1,4-butanediol (the molar ratio of -NCO in the generated polyurethane prepolymer and -OH in the chain extender (1,4-butanediol) is 1:1) is added, which is stirred at a temperature of 80℃ and a stirring rate of 150r / min for 2h to obtain a mixture.

[0057] S3, the mixture obtained in S2 is poured into a teflon strip-shaped mold, and vacuum drying is performed at 100℃ for 48h to obtain a solid bio-based polyurethane phase change material, which is ground and sieved to a particle size of ≤0.075mm to obtain the bio-based polyurethane phase change material.

[0058] The amounts of castor oil, 1,4-butanediol and hexamethylene diisocyanate used in Examples 1-3 are shown in Table 3.

[0059] Table 3 Amounts of castor oil, 1,4-butanediol and hexamethylene diisocyanate used in Examples 1-3

[0060]

[0061] The amounts of castor oil, hexamethylene diisocyanate and 1,4-butanediol in Table 3 are calculated according to the condition that the molar ratio of -OH in castor oil, -NCO in hexamethylene diisocyanate and -OH in 1,4-butanediol is 1:4-6:3-5.

[0062] The phase change parameters of the bio-based polyurethane phase change materials obtained in Examples 1-3 were determined by differential scanning calorimetry (DSC), and the results are shown in Table 4.

[0063] Table 4 Phase change parameters of bio-based polyurethane phase change materials obtained in Examples 1-3

[0064]

[0065] Examples 4-6

[0066] Examples 4-6 provide the preparation of the high-viscosity self-temperature-regulating bio-based polyurethane modified asphalt, and the specific steps are as follows:

[0067] S1, 70 parts of 70# base asphalt were placed in an oven and preheated to a completely flowing state at 140°C, then added to a stirring tank, heated and kept at a temperature of 120°C, and then 15 parts of castor oil, 1 part of polyoxypropylene glycol and 1 part of 1,4-butanediol were added to the stirring tank, and stirred at a rate of 350 r / min for 15 min.

[0068] S2, the bio-based polyurethane phase change material prepared in Example 3 was added to the stirring tank according to the amount in Table 5, and kept at 120°C, and stirred at a stirring rate of 500 r / min for 10 min.

[0069] S3, 15 parts of isocyanate were added to the stirring tank, and stirred at a temperature of 130°C and a stirring rate of 700 r / min for 15 min, and the modified asphalt was placed in an oven at a temperature of 100°C for 7 h to obtain the high-viscosity self-temperature-regulating bio-based polyurethane modified asphalt.

[0070] Table 5 Amount of bio-based polyurethane phase change material prepared in Example 3 in Examples 4-6

[0071]

[0072] Examples 7-8

[0073] Examples 7-8 provide the preparation of the high-viscosity self-temperature-regulating bio-based polyurethane pavement material, and the specific steps are as follows:

[0074] S1, 4700 g of mineral aggregate prepared by using AC-13 type gradation is preheated in an oven at a temperature of 110 DEG C for 4.5 h.

[0075] S2, 370 g (oil stone ratio 7.8%) of high viscosity self-temperature regulating bio-based polyurethane modified asphalt prepared in Example 6 and the mineral aggregate obtained in S1 are added into a preheating mixing kettle at a temperature of 130 DEG C, the temperature is kept and mixing is carried out for 75 s, after uniform mixing, mineral powder is poured in and mixed for another 75 s, and formed by tamping 85 times (double-sided tamping times) at room temperature.

[0076] S3, the formed test piece is cured, and the specific curing parameters are shown in Table 6, and a high viscosity self-temperature regulating bio-based polyurethane pavement material is obtained.

[0077] Table 6 Setting of curing parameters of Examples 7-8

[0078]

[0079] Comparative Example 1

[0080] The difference from Example 4 is that the addition of the bio-based polyurethane phase change material prepared in Example 3 is omitted, and the others are the same as Example 4.

[0081] Comparative Example 2

[0082] The finished styrene-butadiene-styrene modified asphalt is used in this comparative example.

[0083] Performance detection of modified asphalt obtained in Examples 4-6 and Comparative Examples 1-2:

[0084] 1. The performance of the modified asphalt obtained in Examples 4-6 and Comparative Examples 1-2 is tested by testing the three indicators of asphalt and dynamic shear rheological test (DSR), and the specific method is as follows, and the results are shown in Table 7.

[0085] Test method: tested according to the provisions in JTG20 and AASHTO MP19-10 of “Technical Specification for Construction of Highway Asphalt Pavement”.

[0086] Table 7 Performance of modified asphalt obtained in Examples 4-6 and Comparative Examples 1-2

[0087]

[0088] As can be seen from Table 7, the modified asphalt obtained by the application has high softening point, small ductility, high viscosity, large elastic recovery rate and low non-recoverable creep compliance compared with the comparative examples, which shows that the modified asphalt obtained by the application has good high temperature stability, strong anti-deformation ability, excellent elastic performance, good low temperature crack resistance and strong anti-aging performance.

[0089] 2. The modified asphalt obtained in Examples 4-6 and Comparative Examples 1-2 was tested for temperature regulating performance using a grating temperature sensor, in the following manner:

[0090] First, 400 g of the modified asphalt was heated to a molten state and divided into aluminum boxes, a grating temperature sensor was inserted into the middle of the modified asphalt and fixed, and the modified asphalt was left to stand at room temperature for 5 h until it was completely solidified. Subsequently, the modified asphalt was placed in a 16℃ water bath and placed on a support, and after being kept at 16℃ for 2 h, the modified asphalt was moved to a 67℃ water bath to complete the heating process, and the delay time was recorded. After the temperature of the detector was stable for 30 min, the detector was moved back to the 16℃ water bath to complete the cooling process, and the delay time was recorded. The results are shown in Table 8.

[0091] Table 8. Self-temperature regulating performance of the modified asphalt obtained in Examples 4-6 and Comparative Examples 1-2

[0092]

[0093] As can be seen from Table 8, the modified asphalt obtained in the present application has excellent self-temperature regulating performance, and when used in the preparation of pavement materials, the high-temperature rutting and low-temperature cracking of the pavement materials can be reduced, and the service life of the pavement materials can be prolonged.

[0094] Comparative Example 3

[0095] The difference from Example 8 is that the "high-viscosity self-temperature regulating bio-based polyurethane modified asphalt prepared in Example 6" is replaced by "the finished product styrene-butadiene-styrene modified asphalt of Comparative Example 1", and the others are the same as Example 8.

[0096] Comparative Example 4

[0097] The difference from Comparative Example 3 is that the mixing temperature "130℃" is replaced by "180℃", and the others are the same as Comparative Example 3.

[0098] Comparative Example 5

[0099] The difference from Example 8 is that the step of the initial aging is omitted, and the others are the same as Example 8.

[0100] Comparative Example 6

[0101] The difference from Example 8 is that the amount of the high-viscosity self-temperature regulating bio-based polyurethane modified asphalt prepared in Example 6 is replaced by 320 g (oil stone ratio 6.8%), and the others are the same as Example 8.

[0102] Performance test of the pavement materials obtained in Examples 7-8 and Comparative Examples 3-6:

[0103] The performance of the pavement materials obtained in Examples 7-8 and Comparative Examples 3-6 was tested by dynamic semi-circular bending experiment (SCB), and the results are shown in Table 9.

[0104] Table 9 Performance of the pavement material obtained in Examples 7-8 and Comparative Examples 3-6

[0105]

[0106] As can be seen from Table 9, the breaking strength and low-temperature breaking energy of the pavement material obtained in the application are higher than those of the comparative examples, and the rut depth can be controlled in the range of 1.4-2.1 mm.

[0107] The modified asphalt obtained in the application exhibits excellent advantages in heat management, deformation resistance, durability and environmental protection performance, can effectively absorb and store heat at high temperature, can release the stored heat at low temperature, slows down the temperature drop, reduces the risk of low-temperature cracking, realizes the self-temperature-regulating function and prolongs the service life of the pavement. Compared with the conventional styrene-butadiene-styrene modified asphalt, the high-viscosity self-temperature-regulating bio-based polyurethane modified asphalt of the application has a viscosity that is 15% higher than that of Comparative Example 2, and the elastic recovery rate of the material is as high as 98.6%. The addition of the bio-based polyurethane phase change material significantly adjusts the temperature change rate of the modified asphalt, realizes the self-temperature-regulating performance of the high-viscosity self-temperature-regulating bio-based polyurethane pavement material. The breaking strength of the pavement material prepared in the application is improved to 4.43 Mpa, and a high toughness (2587.15 J / m 2 ) is maintained in the low-temperature breaking energy test, and excellent crack resistance is exhibited. Compared with the styrene-butadiene-styrene modified asphalt, not only the technical effects achieved by using the styrene-butadiene-styrene modified asphalt are exceeded, but also the mixing temperature is 50℃ lower than that of the styrene-butadiene-styrene modified asphalt. Moreover, the renewable bio-based raw materials are used in the application, the dependence on petroleum-based raw materials is reduced, carbon emissions are reduced, and the green and environmental protection requirements of sustainable development are met.

[0108] The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0109] The above description of the disclosed embodiments enables a person skilled in the art to implement or use the application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the application. Therefore, the application will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A high-viscosity self-temperature-regulating bio-based polyurethane modified asphalt, characterized in that: The method comprises the following raw materials in parts by weight: 3 to 5 parts of bio-based polyurethane phase change material and 90 to 110 parts of bio-based polyurethane high-viscosity modified asphalt; The bio-based polyurethane high-viscosity modified asphalt comprises the following raw materials in parts by weight: 60-70 parts of base asphalt, 10-20 parts of bio-oil, 0.5-1 part of oligomeric polyol, 0.5-2 parts of chain extender and 15-25 parts of isocyanate; The bio-based polyurethane phase change material is prepared from bio-oil, isocyanate, a chain extender, and a solvent, specifically comprising the following steps: dissolving the bio-oil in a solvent to obtain a mixed solution; first adding isocyanate to the mixed solution for prepolymerization, then adding the chain extender for a chain extension reaction, and drying the product after completion to obtain the bio-based polyurethane phase change material; In the bio-based polyurethane phase change material and the bio-based polyurethane high-viscosity modified asphalt, the bio-oil is castor oil, and the isocyanate is hexamethylene diisocyanate; In the bio-based polyurethane high-viscosity modified asphalt, the oligomeric polyol includes polyoxypropylene glycol and / or polytetramethylene glycol; In the bio-based polyurethane high-viscosity modified asphalt, the chain extender includes 1,4-butanediol and / or ethylene glycol; In the bio-based polyurethane phase change material, the solvent includes N,N-dimethylformamide; In the bio-based polyurethane phase change material, the chain extender includes 1,4-butanediol; In the bio-based polyurethane phase change material, the mass ratio of bio-oil to solvent is 1:8-12, and the molar ratio of -OH in bio-oil, -NCO in isocyanate, and -OH in chain extender is 1:4-6:3-5; the dissolution temperature is 50-60°C, and the dissolution stirring speed is 100-150 r / min; the prepolymerization is carried out under a protective gas atmosphere, the prepolymerization temperature is 60-80°C, the prepolymerization stirring speed is 100-150 r / min, and the prepolymerization time is 3-4 hours; the chain extension reaction is carried out under a protective gas atmosphere, the chain extension reaction temperature is 60-80°C, the chain extension reaction stirring speed is 100-150 r / min, and the chain extension reaction time is 2-3 hours; the protective gas includes nitrogen; the drying temperature is 95-110°C, and the drying time is 48-52 hours; the particle size of the bio-based polyurethane phase change material is ≤0.075 mm.

2. The method for preparing the high-viscosity self-temperature-regulating bio-based polyurethane modified asphalt according to claim 1, characterized in that: The steps include: According to the prescribed amount, bio-oil, oligomeric polyol and chain extender are added to the preheated base asphalt for the first mixing, then the bio-based polyurethane phase change material is added for the second mixing, and finally isocyanate is added for the third mixing to obtain the high-viscosity self-temperature-regulating bio-based polyurethane modified asphalt.

3. The preparation method according to claim 2, characterized in that The preheating temperature of the matrix asphalt is 130~140℃; and / or, the temperature of the first mixing is 100~120℃, the stirring speed of the first mixing is 300~500r / min, and the time of the first mixing is 10~15min; and / or, the temperature of the second mixing is 100~120℃, the stirring speed of the second mixing is 500~700r / min, and the time of the second mixing is 5~10min; and / or, the temperature of the third mixing is 130~140℃, the stirring speed of the third mixing is 700~800r / min, and the time of the third mixing is 15~20min.

4. Use of the high-viscosity self-temperature-regulating bio-based polyurethane modified asphalt according to claim 1 in the preparation of high-viscosity self-temperature-regulating bio-based polyurethane pavement material.

5. A high-viscosity self-temperature regulating bio-based polyurethane pavement material, characterized in that: The high-viscosity self-temperature-regulating bio-based polyurethane pavement material comprises mineral aggregate and the high-viscosity self-temperature-regulating bio-based polyurethane modified asphalt according to claim 1; the oil-to-stone ratio of the high-viscosity self-temperature-regulating bio-based polyurethane pavement material is 5.5-8%; The high-viscosity self-temperature-regulating bio-based polyurethane pavement material is prepared by the following steps: mixing high-viscosity self-temperature-regulating bio-based polyurethane modified asphalt with preheated mineral aggregate, and then sequentially forming and curing to obtain the high-viscosity self-temperature-regulating bio-based polyurethane pavement material; The preheating temperature of the mineral aggregate is 100~110℃, and the preheating time of the mineral aggregate is 4~4.5h; the mixing temperature is 120~130℃, and the mixing time is 130~150s; the curing includes an initial curing stage and a late curing stage, and the curing parameters are set as: initial curing temperature 100~130℃, initial curing time 7~8h, late curing temperature 20~30℃, and late curing time 24~48h.

6. The method for preparing the high-viscosity self-temperature regulating bio-based polyurethane pavement material according to claim 5, characterized in that: The method comprises the following steps: mixing high-viscosity self-temperature-regulating bio-based polyurethane modified asphalt and preheated mineral aggregate, and then sequentially forming and curing to obtain the high-viscosity self-temperature-regulating bio-based polyurethane pavement material; The preheating temperature of the mineral aggregate is 100~110℃, and the preheating time of the mineral aggregate is 4~4.5h; the mixing temperature is 120~130℃, and the mixing time is 130~150s; the curing includes an initial curing stage and a late curing stage, and the curing parameters are set as: initial curing temperature 100~130℃, initial curing time 7~8h, late curing temperature 20~30℃, and late curing time 24~48h.

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