WO2023115672A1 - Asphalt modifier, and preparation method therefor and use thereof - Google Patents

Abstract

An asphalt modifier, and a preparation method therefor and the use thereof. The asphalt modifier comprises the following raw materials, in parts by weight: 15-60 parts of a thermoplastic elastomer, 10-35 parts of a polyurethane elastomer, 15-40 parts of a petroleum resin, 5-20 parts of a heat-sensitive resin, 1-5 parts of a stabilizer and 1-10 parts of a plasticizer. The asphalt modifier can be quickly melted and dispersed in an asphalt mixing tank, such that the viscosity of asphalt at the usage temperature can be significantly improved, and the pavement use performance of the mixture is ensured; the construction viscosity of the asphalt at a high temperature can be effectively reduced, the construction workability of the mixture is improved, and the melt dispersion characteristic of the asphalt modifier is further improved; and the preparation method therefor is simple and convenient for production and application.

Description

Asphalt modifier, preparation method and application

Cross References to Related Applications

This disclosure claims the priority of a Chinese patent application with application number 202111604227.3 and titled "An Asphalt Modifier, Preparation Method and Application" filed with the China Patent Office on December 24, 2021, the entire contents of which are incorporated herein by reference In this disclosure.

technical field

The application relates to the technical field of asphalt modifiers, in particular to an asphalt modifier, a preparation method and an application.

Background technique

In recent years, drainage road pavement technology represented by drainage pavement and ultra-thin overlay has been widely used. This open-graded, large-gap pavement structure can reduce the noise generated by vehicles during driving, and can timely Eliminate the water film on the road surface in rainy days, reduce glare, and improve driving safety and comfort. In order to ensure that the drainage mixture has good high temperature anti-rutting, anti-scattering and durability, the cement must use high-viscosity asphalt.

Usually, the preparation method of high-viscosity asphalt is to add polymer modifiers, tackifiers, stabilizers, etc. to petroleum asphalt for long-term shear development, but modifiers, tackifiers, etc. are mostly different from asphalt , and there is a problem of thermodynamic incompatibility, which leads to segregation. In addition, long-term high-temperature shear development will inevitably lead to the aging and decomposition of modified asphalt. Aiming at these insurmountable problems of "wet modification", Japan has carried out in-depth research and developed the "dry modification" technology represented by TPS additives, that is, the additives are directly put into the mixing tank to melt and disperse rapidly, and Stone material, asphalt and mineral powder are mixed to make high-viscosity modified asphalt mixture, which saves the production process of intermediate modified asphalt, thus effectively avoiding the segregation and thermal decomposition problems of "wet modification".

Most of the high-viscosity modifier products on the market can meet the 60°C dynamic viscosity index requirements of modified asphalt (greater than 50000Pa s), even reaching more than 200000Pa s, but in the process of mixing and construction of asphalt mixture Two outstanding problems: one is that the high-viscosity modifier has poor melt dispersibility, and the mixing time in the mixing tank is only a few tens of seconds, and it cannot be melted quickly and dispersed evenly; The viscosity after mixing is too high, resulting in poor construction workability and difficulty in compacting the mixture. However, a solution that can solve the above two problems simultaneously has not been reported yet.

Contents of the invention

The embodiment of the present application provides an asphalt modifier, preparation method and application to solve the problem that the prior art cannot meet the requirements of high temperature viscosity and low temperature viscosity at the same time.

In the first aspect, an asphalt modifier is provided, comprising the following raw materials in parts by weight: 15-60 parts of thermoplastic elastomer, 10-35 parts of polyurethane elastomer, 15-40 parts of petroleum resin, 5-20 parts of heat-sensitive resin 1-5 parts of stabilizer and 1-10 parts of plasticizer.

In a second aspect, a method for preparing an asphalt modifier is provided, comprising:

Mix the raw materials uniformly to obtain the first mixture, wherein the raw materials include the following raw materials in parts by weight: 15-60 parts of thermoplastic elastomers, 10-35 parts of polyurethane elastomers, 15-40 parts of petroleum resins, heat-sensitive resins 5-20 parts, 1-5 parts of stabilizer, 1-10 parts of plasticizer;

The asphalt modifier is obtained by melting and kneading the first mixture, extruding, cooling and drying.

The third aspect provides an application of the asphalt modifier described in the embodiment of the first aspect in asphalt mixture.

In this way, the embodiment of the present application ensures the high and low temperature performance of the asphalt modifier, which is conducive to the rapid melting and dispersion of the asphalt modifier in the asphalt mixing tank; it can significantly improve the viscosity of the asphalt at the service temperature, and ensure the stability of the mixture. Road performance; it can effectively reduce the construction viscosity of asphalt at high temperature, improve the construction workability of the mixture, and further improve the melting and dispersion characteristics of the asphalt modifier; the preparation method is simple, and it is convenient for production and application.

The above description is only an overview of the technical solution of the present disclosure. In order to better understand the technical means of the present disclosure, it can be implemented according to the contents of the description, and in order to make the above and other purposes, features and advantages of the present disclosure more obvious and understandable , the specific embodiments of the present disclosure are enumerated below.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or related technologies, the following will briefly introduce the drawings that need to be used in the descriptions of the embodiments or related technologies. Obviously, the drawings in the following description are the For some disclosed embodiments, those skilled in the art can also obtain other drawings based on these drawings without any creative work.

Fig. 1 is a flow chart of the preparation method of the asphalt modifier of the embodiment of the present application.

specific embodiment

The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of this application.

The embodiment of the present application discloses an asphalt modifier. The asphalt modifier includes the following raw materials in parts by weight: 15-60 parts of thermoplastic elastomer, 10-35 parts of polyurethane elastomer, 15-40 parts of petroleum resin, 5-20 parts of heat-sensitive resin, 1-5 parts of stabilizer parts and 1 to 10 parts of plasticizer.

Preferably, the parts by weight of the thermoplastic elastomer are 15, 20, 40 or 60, or any two values of 15, 20, 40 and 60 are the upper and lower limits. The parts by weight of the polyurethane elastomer is 10, 20 or 35, or the range with any two values of 15, 20 and 35 as the upper and lower limits. The parts by weight of petroleum resin is 15, 20 or 40, or the range with any two numerical values of 15, 20 and 40 as upper and lower limits. The parts by weight of the heat-sensitive resin is 5, 10, 12 or 20, or a range with any two values of 5, 10, 12 and 20 as upper and lower limits. The parts by weight of the stabilizing agent is 1, 2 or 5, or any two values of 1, 2 and 5 are the upper and lower limits. The parts by weight of the plasticizer are 1, 3, 5, 8 or 10, or any two values of 1, 3, 5, 8 and 10 are the upper and lower limits.

Preferably, the weight ratio of the polyurethane elastomer to the petroleum resin is 1:1˜1:1.5.

Preferably, the weight ratio of the polyurethane elastomer to the heat-sensitive resin is 7:1.

Wherein, the thermoplastic elastomer includes at least one of the following: styrene-butadiene-styrene triblock copolymer (SBS), styrene-isoprene-styrene triblock copolymer (SIS), styrene Ethylene-ethylene-butylene copolymer-styrene triblock copolymer (SEBS) and thermoplastic polyolefin elastomer (TPO). The molecular weight of the thermoplastic elastomer is 50,000 to 300,000. When the molecular weight of the thermoplastic elastomer is lower than 50,000, the performance cannot meet the specification requirements; when the molecular weight of the thermoplastic elastomer is higher than 300,000, the blend cannot be formed and processed by the extruder. The melt index is above 8g/10min, which can improve the melt dispersion performance of the modifier.

The polyurethane elastomer is polyester thermoplastic polyurethane (polyester TPU) with a molecular weight of 60,000-100,000. Polyester thermoplastic polyurethane can further improve the strength and toughness of the matrix material, and can improve the temperature sensitivity of the modifier to a certain extent.

Modified petroleum resins include at least one of the following: modified carbon five resins, modified carbon nine resins and modified terpene resins. The softening point is 80-150°C. The modification method is to graft maleic anhydride on the basis of the original petroleum resin or to modify it with phenol. The modified petroleum resin can improve the molecular cohesion, heat resistance and aging resistance of the blend, and has better compatibility with other resins and thermoplastic elastomers.

The thermosensitive resin includes at least one of the following: polyacrylonitrile resin and polyvinyl chloride resin.

The stabilizer includes at least one of the following: sulfur, calcium-zinc composite stabilizer and methyl tin stabilizer.

The plasticizer includes at least one of the following: dioctyl phthalate, naphthenic rubber oil, furfural extract oil, coumarone resin, and stearic acid. Among them, the aromatic hydrocarbon content of naphthenic rubber oil and furfural extracted oil is above 85%.

Through the above-mentioned raw materials, thermoplastic elastomer and polyurethane elastomer play a role of strengthening and toughening in the whole modifier, ensuring the high and low temperature performance of the modifier, and the molecular weight is moderate, and the melt index is high, which is beneficial to the modifier in Rapid melting and dispersion in the asphalt mixing tank; modified petroleum resin contains strong polar groups, and the combination of polyurethane elastomer can significantly increase the viscosity of asphalt at the use temperature to ensure the road performance of the mixture; heat-sensitive resin is sensitive to temperature Extremely strong, when combined with polyurethane elastomer, it can effectively reduce the construction viscosity of asphalt at high temperature and improve the workability of the mixture; in addition, the reduction of high temperature viscosity can further improve the melt dispersion characteristics of the modifier.

The embodiment of the present application also discloses a preparation method of the asphalt modifier. Specifically, as shown in Figure 1, the preparation method includes the following steps:

Step S1: Mix the raw materials evenly to obtain a first mixture.

The raw materials adopt the parts by weight described in the above-mentioned embodiments, and will not repeat them here. Mixing can be done in a high speed blender. The mixing temperature is 50-100°C.

Step S2: Melt and knead the first mixture, extrude, cool and dry to obtain an asphalt modifier.

A twin-screw extruder is used for melt mixing and extrusion operations. The barrel temperature of the twin-screw extruder is 150°C-220°C, and the screw speed of the twin-screw extruder is 100-500r/min.

The embodiment of the present application also discloses the application of an asphalt modifier in asphalt mixture. Specifically, the asphalt modifier can be used to prepare high-viscosity modified asphalt, and can also be used to prepare high-viscosity asphalt mixture.

The technical solution of the present application will be further elaborated below with specific examples.

Example 1

The raw material of this asphalt modifier comprises: styrene-butadiene-styrene triblock copolymer (styrene content is 30%, melt index is 12g/10min) 60 parts, thermoplastic polyurethane 10 parts, modified carbon five 15 parts of petroleum resin, 12 parts of polyvinyl chloride resin, 2 parts of calcium zinc composite stabilizer, 1 part of dioctyl phthalate.

The method of preparing asphalt modifier from the raw materials is as follows: weigh the raw materials according to the above ratio, add them to the high-speed mixer, stir at 50°C for 10 minutes at high speed, and then send them to the twin-screw extruder for extrusion and granulation. The temperature is 180°C, the screw speed is 150r/min, and the asphalt modifier 1# is obtained.

The method for preparing high-viscosity modified asphalt with the asphalt modifier is: heating the base asphalt to 160°C, and then adding an appropriate amount of the asphalt modifier (the mass ratio of the asphalt modifier to the base asphalt is 12:88) After stirring evenly, gradually heat to 180±10°C, then use high-speed shearing machine to cut for 20min at this temperature, the shearing speed is 4500r/min, and finally put the sheared mixture in an oven at 180°C for 20min , to obtain high-viscosity modified asphalt.

The method for preparing high-viscosity asphalt mixture with this asphalt modifier is as follows: heat base asphalt to 160-165°C, prepare coarse and fine aggregates according to the gradation shown in Table 1, and place them in an oven at 180-190°C Keep warm for 5 hours. Turn on the mixing pot, dry mix the asphalt modifier and hot aggregate together for 60s, disperse the sample evenly in the mineral aggregate, then add base asphalt and mix for 90s, and finally add mineral powder and mix for 90s to obtain a high-viscosity asphalt mixture material.

Table 1 Test gradation of asphalt mixture for drainage pavement

Mesh size/mm	16	13.2	9.5	4.75	2.36	1.18	0.6	0.3	0.15	0.075
Passing rate/%	100	93.5	60.0	19.5	14.6	12.3	9.5	8.6	6.0	5.2

Example 2

The raw materials of this asphalt modifier include: 40 parts of styrene-ethylene-butylene copolymer-styrene triblock copolymer (styrene content is 29%, melt index is 10g/10min), 20 parts of thermoplastic polyurethane, modified 20 parts of terpene resin, 10 parts of polyacrylonitrile resin, 2 parts of sulfur, 8 parts of naphthenic rubber oil (aromatic content 89%).

The method of preparing asphalt modifier from the raw materials is as follows: weigh the raw materials according to the above ratio, add them to the high-speed mixer, stir at 50°C for 10 minutes at high speed, and then send them to the twin-screw extruder for extrusion and granulation. The temperature is 180°C, the screw speed is 150r/min, and asphalt modifier 2# is obtained.

The method for preparing high-viscosity modified asphalt with the asphalt modifier is: heating the base asphalt to 160°C, and then adding an appropriate amount of the asphalt modifier (the mass ratio of the asphalt modifier to the base asphalt is 12:88) After stirring evenly, gradually heat to 180±10°C, then use high-speed shearing machine to cut for 20min at this temperature, the shearing speed is 4500r/min, and finally put the sheared mixture in an oven at 180°C for 20min , to obtain high-viscosity modified asphalt.

The method for preparing high-viscosity asphalt mixture with this asphalt modifier is as follows: heat base asphalt to 160-165°C, prepare coarse and fine aggregates according to the gradation shown in Table 1, and place them in an oven at 180-190°C Keep warm for 5h. Turn on the mixing pot, dry mix the asphalt modifier and hot aggregate together for 60s, disperse the sample evenly in the mineral aggregate, then add base asphalt and mix for 90s, and finally add mineral powder and mix for 90s to obtain a high-viscosity asphalt mixture material.

Example 3

The raw materials of this asphalt modifier include: 40 parts of styrene-ethylene-butylene copolymer-styrene triblock copolymer (styrene content is 30%, melt index is 22g/10min), 10 parts of thermoplastic polyurethane, modified 15 parts of carbon nine resin, 20 parts of polyvinyl chloride resin, 5 parts of methyl tin stabilizer, 10 parts of coumarone resin.

The method of preparing asphalt modifier from raw materials is as follows: weigh the raw materials according to the above ratio, add them to the high-speed mixer, stir at 100°C for 10 minutes at high speed, and then send them to the twin-screw extruder for extrusion and granulation. The temperature is 200°C, the screw speed is 180r/min, and the asphalt modifier 3# is obtained.

The method for preparing high-viscosity modified asphalt with the asphalt modifier is: heating the base asphalt to 160°C, and then adding an appropriate amount of the asphalt modifier (the mass ratio of the asphalt modifier to the base asphalt is 12:88) After stirring evenly, gradually heat to 180±10°C, then use high-speed shearing machine to cut for 20min at this temperature, the shearing speed is 4500r/min, and finally put the sheared mixture in an oven at 180°C for 20min , to obtain high-viscosity modified asphalt.

The method for preparing high-viscosity asphalt mixture with this asphalt modifier is as follows: heat base asphalt to 160-165°C, prepare coarse and fine aggregates according to the gradation shown in Table 1, and place them in an oven at 180-190°C Keep warm for 5 hours. Turn on the mixing pot, dry mix the asphalt modifier and hot aggregate together for 60s, disperse the sample evenly in the mineral aggregate, then add base asphalt and mix for 90s, and finally add mineral powder and mix for 90s to obtain a high-viscosity asphalt mixture material.

Example 4

The raw materials of the asphalt modifier include: 20 parts of styrene-ethylene-butylene copolymer-styrene triblock copolymer (styrene content is 30%, melt index is 22g/10min), 35 parts of thermoplastic polyurethane, modified 40 parts of terpene resin, 5 parts of polyacrylonitrile resin, 2 parts of methyl tin stabilizer, 3 parts of furfural extract oil (aromatic content is 92%).

The method of preparing asphalt modifier from raw materials is as follows: weigh each component according to the above ratio and add it to a high-speed mixer, stir at 80°C for 10 minutes at a high speed, and then send it to a twin-screw extruder for extrusion and granulation. The cylinder temperature is 200°C, the screw speed is 180r/min, and asphalt modifier 4# is obtained.

The method for preparing high-viscosity modified asphalt with the asphalt modifier is: heating the base asphalt to 160°C, and then adding an appropriate amount of the asphalt modifier (the mass ratio of the asphalt modifier to the base asphalt is 12:88) After stirring evenly, gradually heat to 180±10°C, then use high-speed shearing machine to cut for 20min at this temperature, the shearing speed is 4500r/min, and finally put the sheared mixture in an oven at 180°C for 20min , to obtain high-viscosity modified asphalt.

The method for preparing high-viscosity asphalt mixture with this asphalt modifier is as follows: heat base asphalt to 160-165°C, prepare coarse and fine aggregates according to the gradation shown in Table 1, and place them in an oven at 180-190°C Keep warm for 5 hours. Turn on the mixing pot, dry mix the asphalt modifier and hot aggregate together for 60s, disperse the sample evenly in the mineral aggregate, then add base asphalt and mix for 90s, and finally add mineral powder and mix for 90s to obtain a high-viscosity asphalt mixture material.

Example 5

The raw materials of the asphalt modifier include: 15 parts of styrene-ethylene-butylene copolymer-styrene triblock copolymer (styrene content is 30%, melt index is 20g/10min), 35 parts of thermoplastic polyurethane, modified 40 parts of carbon nine resin, 5 parts of polyacrylonitrile resin, 2 parts of methyl tin stabilizer, 3 parts of naphthenic rubber oil (the content of aromatic hydrocarbon is 89%).

The method of preparing asphalt modifier from raw materials is as follows: weigh each component according to the above ratio and add it to a high-speed mixer, stir at 80°C for 10 minutes at a high speed, and then send it to a twin-screw extruder for extrusion and granulation. The cylinder temperature is 220°C, the screw speed is 200r/min, and asphalt modifier 5# is obtained.

The method for preparing high-viscosity modified asphalt with the asphalt modifier is: heating the base asphalt to 160°C, and then adding an appropriate amount of the asphalt modifier (the mass ratio of the asphalt modifier to the base asphalt is 12:88) After stirring evenly, gradually heat to 180±10°C, then use high-speed shearing machine to cut for 20min at this temperature, the shearing speed is 4500r/min, and finally put the sheared mixture in an oven at 180°C for 20min , to obtain high-viscosity modified asphalt.

The method for preparing high-viscosity asphalt mixture with this asphalt modifier is as follows: heat base asphalt to 160-165°C, prepare coarse and fine aggregates according to the gradation shown in Table 1, and place them in an oven at 180-190°C Keep warm for 5h. Turn on the mixing pot, dry mix the asphalt modifier and hot aggregate together for 60s, disperse the sample evenly in the mineral aggregate, then add base asphalt and mix for 90s, and finally add mineral powder and mix for 90s to obtain a high-viscosity asphalt mixture material.

Example 6

The raw materials of the asphalt modifier include: 40 parts of thermoplastic polyolefin elastomer, 35 parts of thermoplastic polyurethane, 15 parts of modified terpene resin, 5 parts of polyacrylonitrile resin, 1 part of calcium-zinc composite stabilizer, phthalic acid Dioctyl ester 5 parts.

The method of preparing asphalt modifier from raw materials is as follows: weigh each component according to the above ratio and add it to a high-speed mixer, stir at 80°C for 10 minutes at a high speed, and then send it to a twin-screw extruder for extrusion and granulation. The barrel temperature was 200°C, the screw speed was 180r/min, and asphalt modifier 6# was obtained.

The method for preparing high-viscosity modified asphalt with the asphalt modifier is: heating the base asphalt to 160°C, and then adding an appropriate amount of the asphalt modifier (the mass ratio of the asphalt modifier to the base asphalt is 12:88) After stirring evenly, gradually heat to 180±10°C, then use high-speed shearing machine to cut for 20min at this temperature, the shearing speed is 4500r/min, and finally put the sheared mixture in an oven at 180°C for 20min , to obtain high-viscosity modified asphalt.

The method for preparing high-viscosity asphalt mixture with this asphalt modifier is as follows: heat base asphalt to 160-165°C, prepare coarse and fine aggregates according to the gradation shown in Table 1, and place them in an oven at 180-190°C Keep warm for 5 hours. Turn on the mixing pot, dry mix the asphalt modifier and hot aggregate together for 60s, disperse the sample evenly in the mineral aggregate, then add base asphalt and mix for 90s, and finally add mineral powder and mix for 90s to obtain a high-viscosity asphalt mixture material.

According to the test method in "Highway Engineering Asphalt and Asphalt Mixture Test Regulations (JTG E20-2011)", the modified asphalt and asphalt mixture prepared by the asphalt modifier of Examples 1~6# were tested for related performance , and the test results are shown in Table 2.

Table 2 Properties of high-viscosity modified asphalt and high-viscosity asphalt mixture

From the performance test results in Table 2, it can be seen that:

(1) The core index road performance of the high-viscosity modified asphalt and high-viscosity asphalt mixture prepared by the high-viscosity modifiers of Examples 1# to 6# is much higher than the technical requirements of the standard specification, and the high-viscosity modified asphalt 60 The dynamic viscosities at ℃ are all greater than 200,000Pa·s, which ensures the bonding performance of the large-pore mixture at the actual use temperature; the Brookfield viscosities at 170°C are all less than 3Pa·s, which meets the construction workability requirements of the large-pore mixture. High-viscosity asphalt mixture has excellent road performance and has broad application prospects.

(2) The results of Examples 1# to 3# show that when the ratio of thermoplastic polyurethane to petroleum resin is in the range of 1:1 to 1:1.5, due to the synergistic effect of polar groups in thermoplastic polyurethane and petroleum resin, the improved The stabilizer exhibits better low-temperature viscosity, resulting in a substantial increase in the 60°C dynamic viscosity of the high-viscosity modified asphalt, and an improvement in the road performance of the mixture.

(3) The results of Examples 4# to 6# show that when the ratio of thermoplastic polyurethane to heat-sensitive resin is 7:1, due to the synergistic effect of thermoplastic polyurethane and heat-sensitive resin, the modifier exhibits more excellent high-temperature viscosity, resulting in The 170℃ dynamic viscosity of high viscosity modified asphalt is greatly reduced.

(4) It can also be seen from the above examples that low-temperature viscosity and high-temperature viscosity cannot be optimal at the same time. Therefore, the selection of the amount of thermoplastic polyurethane, petroleum resin and heat-sensitive resin that mainly affects these two kinds of viscosity is very important , only if the dosage of the three is reasonable, can both low temperature viscosity and high temperature viscosity meet the requirements. When the amount of thermoplastic polyurethane and petroleum resin is determined, ensure better high-temperature viscosity, and increase the temperature-sensitive resin to improve low-temperature viscosity; when the amount of thermoplastic polyurethane and heat-sensitive resin is determined, ensure better low-temperature viscosity and reduce the viscosity of petroleum resin The dosage can improve high temperature viscosity.

To sum up, the embodiment of the present application ensures the high and low temperature use performance of the asphalt modifier, which is beneficial to the rapid melting and dispersion of the asphalt modifier in the asphalt mixing tank; it can significantly increase the viscosity of the asphalt at the use temperature, ensuring that the mixture Excellent road performance; can effectively reduce the construction viscosity of asphalt at high temperature, improve the construction workability of the mixture, and further improve the melting and dispersion characteristics of the asphalt modifier; the preparation method is simple, and it is convenient for production and application.

The above is only a specific implementation of the application, but the scope of protection of the application is not limited thereto. Anyone familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the application. Should be covered within the protection scope of this application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims (10)

1. An asphalt modifier, characterized in that it comprises the following raw materials in parts by weight: 15-60 parts of thermoplastic elastomer, 10-35 parts of polyurethane elastomer, 15-40 parts of petroleum resin, and 5-20 parts of heat-sensitive resin , 1-5 parts of stabilizer and 1-10 parts of plasticizer.
2. The asphalt modifier according to claim 1, wherein the thermoplastic elastomer comprises at least one of the following: styrene-butadiene-styrene triblock copolymer, styrene-isoprene - styrene triblock copolymer, styrene-ethylene butylene copolymer-styrene triblock copolymer and thermoplastic polyolefin elastomer, the molecular weight of the thermoplastic elastomer is 5-300,000, and the melt index is 8g/ More than 10 minutes.
3. The asphalt modifier according to claim 1, wherein the polyurethane elastomer is polyester thermoplastic polyurethane with a molecular weight of 60,000-100,000.
4. The asphalt modifier according to claim 1, wherein the petroleum resin is a modified petroleum resin, and the modified petroleum resin includes at least one of the following: modified carbon five resin, modified carbon nine resin and modified terpene resins.
5. The asphalt modifier according to claim 1, wherein the thermosensitive resin comprises at least one of the following: polyacrylonitrile resin and polyvinyl chloride resin.
6. The asphalt modifier according to claim 1, wherein the stabilizer comprises at least one of the following: sulfur, calcium-zinc composite stabilizer and methyl tin stabilizer.
7. The asphalt modifier according to claim 1, wherein the plasticizer comprises at least one of the following: dioctyl phthalate, naphthenic rubber oil, furfural extraction oil, coumarone resin and stearic acid.
8. A kind of preparation method of asphalt modifier, is characterized in that, comprises:

   Mix the raw materials uniformly to obtain the first mixture, wherein the raw materials include the following raw materials in parts by weight: 15-60 parts of thermoplastic elastomers, 10-35 parts of polyurethane elastomers, 15-40 parts of petroleum resins, heat-sensitive resins 5-20 parts, 1-5 parts of stabilizer, 1-10 parts of plasticizer;

   The asphalt modifier is obtained by melting and kneading the first mixture, extruding, cooling and drying.
9. The preparation method of asphalt modifier according to claim 8, characterized in that: the mixing temperature is 50-100°C;

   A twin-screw extruder is used for the melt-kneading and extrusion operations, the barrel temperature of the twin-screw extruder is 150°C-220°C, and the screw speed of the twin-screw extruder is 100-500r/min .
10. An application of the asphalt modifier according to any one of claims 1 to 7 in asphalt mixture.

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