Process for the preparation of a multi-grafted comb copolymer and the product and use thereof

Abstract

The application discloses a preparation method of a multi-grafted comb copolymer, and the obtained product and application. Firstly, an elastomer is functionalized, and an acid anhydride group, a carboxyl group, an epoxy group and the like are introduced into an elastomer molecular chain, then a hydroxyl-terminated compound or an amine group-terminated compound is reacted with the functionalized elastomer to obtain a multi-grafted comb copolymer, and the copolymer is further compounded with a plasticizer, an oil substance, a coupling agent and a petroleum resin to obtain a direct-throwing high-viscosity asphalt modifier. The modifier has good road performance, can form a stable and uniform network structure with an asphalt matrix, the modified asphalt adopting the modifier can not only maintain excellent 60 DEG C dynamic viscosity, but also can significantly improve storage stability, and is expected to reduce a construction temperature and realize green and environment-friendly construction.

Description

Technical Field

[0001] This invention relates to a method for preparing a polymer composite material for asphalt modification, particularly to a method for preparing a multi-grafted comb copolymer and the resulting product, and also to a method for preparing a modifier that can rapidly melt in asphalt and significantly improve asphalt viscosity and overall road performance, and its application. It belongs to the fields of polymer materials and road engineering technology. Background Technology

[0002] In road engineering, to improve the rutting resistance, water damage resistance, and durability of asphalt pavements, especially drainage asphalt pavements, bridge deck paving, and heavy-duty traffic pavements, high-viscosity modified asphalt must be used as the key binder. Traditional technology mainly relies on adding high doses of elastomers such as SBS (styrene-butadiene-styrene block copolymer) to the base asphalt and compounding it with other resins, then preparing it under high-temperature conditions through a long-term high-shear and incubation process. However, this traditional route has several prominent drawbacks: First, the production process is complex and inefficient. The melting and dispersion of the modifier depends on a long period (usually exceeding 1 hour) of high-intensity shear and a long-term high-temperature development process, resulting in huge energy consumption, high equipment requirements, and long production cycles. Second, there is a significant contradiction between product storage stability and workability during construction. High polymer content easily leads to phase separation during storage, and further temperature increases are often required to ensure workability during construction, which accelerates asphalt aging and increases harmful emissions. Third, the melting and dispersion rate of the traditional modifier itself has become one of the bottlenecks restricting the acceleration of the entire production process. Summary of the Invention

[0003] To address the common challenges in the aforementioned industries, this invention aims to provide a method for preparing a multi-grafted comb copolymer and the resulting product. This invention modifies SBS or SIS elastomers through optimized molecular design to obtain a multi-grafted comb copolymer. This copolymer can achieve rapid and uniform melting and dispersion in asphalt at a relatively mild temperature through conventional stirring or short-time shearing, overcoming the problems of low efficiency, high energy consumption, and long production cycle in the current modification of asphalt using elastomers such as SBS.

[0004] The specific technical solution of this invention is as follows: A method for preparing a multi-grafted comb copolymer includes the following steps: mixing a functionalized elastomer, a hydroxyl-terminated compound, or an amino-terminated compound, and performing melt extrusion in a twin-screw extruder to obtain a multi-grafted comb copolymer.

[0005] Furthermore, the elastomer is a linear triblock copolymer, such as SBS (styrene-butadiene-styrene block copolymer) or SIS (styrene-isoprene-styrene block copolymer). Functionalized elastomers are elastomers with functional groups, obtained by modifying an elastomer with a compound containing functional groups. The functional groups are anhydride groups, carboxylic acid groups, or epoxy groups, and the functional groups modify the elastomer through grafting. The mass ratio of the elastomer to the compound containing the functional groups can be 100:1-5, for example, 100:1, 100:2, 100:3, 100:4, or 100:5.

[0006] Furthermore, the molecular weight of the functionalized elastomer is 80,000 to 150,000.

[0007] Furthermore, the hydroxyl-terminated compound is at least one of low molecular weight polyether polyols, hydroxyl-terminated polybutadiene (HTPB), etc. The molecular weight of the polyether polyol is 200-600, and for example, it can be at least one of polyethylene glycol (PEG), polypropylene glycol (PPG), polycaprolactone polyol (PCL), etc.

[0008] Furthermore, the amino-terminated compound is at least one selected from the following: aliphatic amines containing long alkyl chains, amides containing long alkyl chains, polyether amines, amino-terminated polyisoprene, amino-terminated polybutadiene, etc. The aliphatic amine can be a C12-C18 aliphatic amine, cocoamine, etc., and the amide can be a C12-C18 amide, etc. Preferably, the amino-terminated compound is at least one selected from the following: a C12-C18 aliphatic amine, cocoamine, amino-terminated polyisoprene, amino-terminated polybutadiene, etc.

[0009] Furthermore, when the compound is terminally hydroxyl-terminated, the reaction requires a catalyst, which is one or more of dibutyltin dilaurate, dimethylaminoethyl ether, N-ethylmorpholine, etc. The mass ratio of the functionalized elastomer to the catalyst is 100:0.005-0.02, for example 100:0.005, 100:0.01, 100:0.015, 100:0.02.

[0010] Furthermore, the mass ratio of the functionalized elastomer to the hydroxyl-terminated compound or the amino-terminated compound is 100:1 to 10, for example, 100:1, 100:2, 100:3, 100:4, 100:5, 100:6, 100:7, 100:8, 100:9, 100:10.

[0011] Furthermore, the raw materials react during the extrusion process in a twin-screw extruder to obtain a multi-grafted comb copolymer. The extruder is divided into five temperature zones along the material flow direction: a solid conveying zone, a melting zone, a mixing zone, a devolatilization and venting zone, and a melt conveying zone. The temperatures in each zone are 85-95℃, 100-140℃, 130-160℃, 140-160℃, and 140-155℃, respectively, with the die head temperature at 140-155℃. The screw speed is 160-200 rpm.

[0012] Furthermore, Figure 1 The reaction mechanism diagram is shown for a multi-grafted comb copolymer with SBS as the elastomer, epoxy groups as the functionalized groups, and aliphatic amines as the amino-terminated compounds. The structural schematic diagram of the resulting multi-grafted comb copolymer is shown below. Figure 2 As shown, the main chain is an elastomer with multiple grafted side chains attached to it. The side chains also contain groups such as amine, hydroxyl, and amide.

[0013] The present invention also provides a direct-injection, fast-dissolving, high-viscosity asphalt modifier, which comprises a multi-grafted comb copolymer prepared according to the above preparation method.

[0014] Furthermore, the direct-injection, fast-dissolving, high-viscosity asphalt modifier is composed of the following components in parts by weight: 100 parts of multi-grafted comb copolymer 20-50 parts of oily substances 10-20 parts plasticizer 0.1 to 0.5 parts of coupling agent 5-20 parts of petroleum resin.

[0015] Furthermore, in the aforementioned direct-injection, fast-dissolving, high-viscosity asphalt modifier, the oily substance is one or more of naphthenic oil, aromatic oil, furfural extract oil, reduced-density oil, reduced-density oil, and castor oil. The amount of the oily substance used is 20-50 parts, for example, 20 parts, 25 parts, 30 parts, 35 parts, 40 parts, 45 parts, and 50 parts.

[0016] Furthermore, in the aforementioned direct-injection, fast-dissolving, high-viscosity asphalt modifier, the plasticizer is one or more of dioctyl phthalate (DOP), dibutyl phthalate (DBP), environmentally friendly plasticizer T60, epoxidized soybean oil, etc. The amount of plasticizer used is 10-20 parts, for example, 10 parts, 11 parts, 12 parts, 13 parts, 14 parts, 15 parts, 16 parts, 17 parts, 18 parts, 19 parts, or 20 parts.

[0017] Furthermore, in the aforementioned direct-injection, fast-dissolving, high-viscosity asphalt modifier, the coupling agent is one or more silane coupling agents. The silane coupling agent can be at least one of KH550, KH560, or KH570. The amount of coupling agent used is 0.1 to 0.5 parts, for example, 0.1 parts, 0.2 parts, 0.3 parts, 0.4 parts, or 0.5 parts.

[0018] Furthermore, in the aforementioned direct-injection, fast-dissolving, high-viscosity asphalt modifier, the molecular weight of the petroleum resin is 500-3000, and the petroleum resin can be one or more of C5 resin, C9 resin, C5 / C9 copolymer resin, rosin resin, terpene resin, and coumarone resin. The amount of petroleum resin used is 5-20 parts, for example, 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, 10 parts, 11 parts, 12 parts, 13 parts, 14 parts, 15 parts, 16 parts, 17 parts, 18 parts, 19 parts, and 20 parts.

[0019] This invention relates to a direct-injection, fast-dissolving, high-viscosity asphalt modifier with excellent road performance. Its preparation method is simple and can be carried out in two steps: first, a multi-grafted comb copolymer is prepared; then, the multi-grafted comb copolymer, plasticizer, oil, coupling agent, and petroleum resin are pre-blended; and finally, the resulting pre-blended material is melted, extruded, and granulated in a twin-screw extruder to obtain the direct-injection, fast-dissolving, high-viscosity asphalt modifier. Alternatively, it can be formed in one step: the raw materials of the multi-grafted comb copolymer (SBS, functional modifiers, hydroxyl-terminated compounds, amino-terminated compounds, etc.) are first added to a twin-screw extruder for melt reaction to form the multi-grafted comb copolymer; then, a pre-mixed material of plasticizer, oil, coupling agent, and petroleum resin is added, melt-extruded, and granulated to obtain the direct-injection, fast-dissolving, high-viscosity asphalt modifier.

[0020] Furthermore, when the raw material is the multi-grafted comb copolymer prepared above, the multi-grafted comb copolymer plasticizer, oily substances, coupling agent, and petroleum resin are first pre-blended, and then added to a twin-screw extruder. The mixture is extruded and granulated at barrel temperatures of 85-95°C, 100-120°C, 120-140°C, 120-140°C, and 130-140°C, with a die head temperature of 120-140°C, to obtain a direct-injection, fast-dissolving, high-viscosity asphalt modifier. The screw speed is 160-200 rpm.

[0021] Furthermore, when the raw material used is a multi-grafted comb copolymer, the steps are as follows: (S1) The elastomer, functionalized additives and initiator are premixed to obtain mixture 1; (S2) Premix hydroxyl-terminated compounds or amino-terminated compounds, plasticizers, oils, coupling agents, and petroleum resins to obtain mixture 2; (S3) Mixture 1 and mixture 2 are added to a twin-screw extruder for extrusion granulation to obtain a direct-injection, fast-dissolving, high-viscosity asphalt modifier. The temperature zones of the twin-screw extruder are 85-95℃, 100-140℃, 130-160℃, 140-160℃, and 130-155℃, with a die head temperature of 130-155℃. Mixture 1 is added in the first temperature zone, while mixture 2 is added during extrusion in the second temperature zone.

[0022] Furthermore, in step S1, the functionalized auxiliary agent is a compound containing functional groups such as anhydride groups, carboxylic acid groups, and epoxy groups. Functionalized auxiliary agents containing anhydride groups can be maleic anhydride, fumaric anhydride, dodecenyl succinic anhydride, octenyl succinic anhydride, etc. Functionalized auxiliary agents containing carboxylic acid groups can be acrylic acid, maleic acid, fumaric acid, etc. Functionalized auxiliary agents containing epoxy groups can be GMA (glycidyl methacrylate), allyl glycidyl ether (AGE), vinyl phenyl glycidyl ether, etc.

[0023] Furthermore, in step S1, the initiator is DCP (dicumyl peroxide), benzoyl peroxide (BPO), azobisisobutyronitrile (AIBN), etc.

[0024] Furthermore, in step S1, the mass ratio of the elastomer to the functionalized additive is 100:1~5.

[0025] Furthermore, in step S1, the mass ratio of elastomer to initiator is 100:0.05~0.1.

[0026] Furthermore, the present invention also provides a high-viscosity asphalt, comprising a base asphalt and the aforementioned direct-injection, fast-dissolving high-viscosity asphalt modifier. The mass ratio of the base asphalt to the direct-injection, fast-dissolving high-viscosity asphalt modifier is 100:10-30, for example, 100:10, 100:15, 100:20, 100:25, or 100:30.

[0027] The present invention has the following beneficial effects: 1. This invention functionalizes the elastomer SBS (styrene-butadiene-styrene block copolymer) or SIS (styrene-isoprene-styrene block copolymer) by introducing anhydride groups, carboxylic acid groups, epoxy groups, etc., into the SBS or SIS molecular chain. Then, the functionalized SBS or SIS is reacted with hydroxyl-terminated compounds or amine-terminated compounds to obtain a multi-grafted comb-type copolymer. This copolymer has a short-branched branched structure, and the branches contain polar groups such as polyether structures, hydroxyl groups, amide groups, and amine groups, increasing the polarity and free volume of the copolymer. During the copolymer melting process, it acts as a plasticizer, thereby accelerating the melting of the copolymer.

[0028] 2. The multi-grafted comb copolymer prepared in this invention, when combined with other additives, yields a direct-application, fast-dissolving, high-viscosity asphalt modifier. The added oily substances and the non-polar and polar components of the plasticizer simultaneously solubilize the main chain and branches of SBS or SIS, achieving a synergistic effect of internal and external plasticization. This allows SBS or SIS to fully swell, transforming the molecular chains from a coiled state to a highly extended state, thereby lowering the melting temperature of the elastomer. During mixing with hot asphalt, it can quickly melt and disperse into the base asphalt under stirring. Furthermore, the polar groups such as amine groups introduced on the side chains of the grafted comb copolymer can interact with the polar groups on the resins or asphaltenes in the asphalt, improving its compatibility. The amine groups can also increase the adhesion between asphalt and aggregates, further improving road performance.

[0029] 3. This invention mixes multi-grafted comb copolymers with oils, plasticizers, coupling agents, and petroleum resins to prepare a direct-injection, fast-dissolving, high-viscosity asphalt modifier. This modifier is a direct-injection modifier with "fast-melting" characteristics. It can achieve rapid and uniform melting and dispersion in asphalt under relatively mild temperature conditions through conventional stirring or short-time shearing, thereby greatly simplifying the production process, reducing energy consumption and equipment dependence, and exhibiting good road performance.

[0030] 4. The modifier of this invention, through optimized molecular design and composite technology, can form a stable and uniform network structure with the asphalt matrix. Modified asphalt obtained using this modifier not only maintains excellent dynamic viscosity at 60℃ but also significantly improves storage stability and is expected to reduce construction temperature, enabling green and environmentally friendly construction. Therefore, developing this fast-melting, high-viscosity asphalt modifier is an effective way to solve key problems such as "high energy consumption, low efficiency, and poor storage stability" in the production and application of high-performance asphalt binders, starting from the material itself, and has significant value in promoting the upgrading of road material technology. Attached Figure Description

[0031] Figure 1 The reaction mechanism diagram is shown for a multi-grafted comb copolymer with SBS as the elastomer, epoxy groups (introduced by GMA (glycidyl methacrylate)) as the functionalizing group, and a fatty amine as the amino-terminated compound.

[0032] Figure 2 This is a schematic diagram of the structure of the multi-grafted comb copolymer of the present invention.

[0033] Figure 3 The infrared spectrum of the comb copolymer obtained by grafting SBS with GMA (glycidyl methacrylate) and further reacting with an amine-containing compound in Example 1 is shown.

[0034] Figure 4 This is a fluorescence micrograph of the high-viscosity asphalt from Example 1.

[0035] Figure 5 Figure 1 shows the state of the high-viscosity asphalt of Example 1 (Figure a) and the high-viscosity asphalt of Comparative Example 1 (Figure b) after being stirred at 180°C for 40 min. Detailed Implementation

[0036] The technical solutions provided by the present invention will be described in detail below with reference to the embodiments, but they should not be construed as limiting the scope of protection of the present invention. In the following embodiments and comparative examples, unless otherwise specified, all parts of raw materials are parts by weight, and all raw materials used are commercially available products.

[0037] Example 1 (1) Mix 100 parts of SBS particles, 5 parts of GMA (glycidyl methacrylate) monomer and 0.08 parts of DCP (diisopropylbenzene peroxide) initiator in a high-speed mixer at room temperature for 5-10 minutes to make each component evenly dispersed on the surface of SBS, and obtain mixture 1.

[0038] (2) The premixed mixture 1 was added to a twin-screw extruder for extrusion. The screw speed was 180 rpm. The twin-screw extruder had 5 temperature zones, which were set according to the material running direction as follows: 90℃, 130℃, 140℃, 155℃, and 150℃. The die head temperature was 150℃. The extruded and pelletized material was used to obtain GMA-functionalized SBS polymer. (3) Mix 100 parts of GMA-functionalized SBS with 4 parts of terminal amine compound hexadecylamine, add it to a twin-screw extruder, set the temperature to 90℃, 130℃, 140℃, 155℃, 150℃, and the die head temperature to 150℃ for extrusion granulation, and the screw speed to 180 rpm to obtain comb-type graft copolymer. (4) Mix 100 parts of comb-type graft copolymer, 20 parts of plasticizer dioctyl phthalate, 50 parts of oily aromatic oil, 0.1 parts of silane coupling agent KH560 and 20 parts of petroleum resin C5 resin in a mixer at room temperature for 5 to 10 minutes to obtain mixture 2.

[0039] (5) Add the premixed mixture 2 to a twin-screw extruder for extrusion. Set the temperature to 90°C, 120°C, 130°C, 140°C, 140°C, and the die head temperature to 130°C for extrusion granulation. The screw speed is 180 rpm to obtain the direct-injection fast-melting high-viscosity asphalt modifier.

[0040] (6) Add 15 parts of direct-injection rapid-melting high-viscosity asphalt modifier to 100 parts of 70# base asphalt, and add 0.2 parts of commercial stabilizer. Stir at 180℃ for 40 min and incubate for 1 h to obtain high-viscosity asphalt.

[0041] Example 2 High viscosity asphalt was prepared according to the method of Example 1, except that the GMA in step (1) was replaced with an equal mass of AGE (allyl glycidyl ether).

[0042] Example 3 High-viscosity asphalt was prepared according to the method of Example 1, except that the SBS in step (1) was replaced with an equal mass of SIS.

[0043] Example 4 High-viscosity asphalt was prepared according to the method of Example 1, except that the hexadecylamine in step (3) was replaced with an equal mass of cocoylamine.

[0044] Example 5 The high viscosity asphalt was prepared according to the method of Example 1, except that step (4) was: 100 parts of comb-type graft copolymer, 15 parts of plasticizer epoxidized soybean oil, 40 parts of oily substance castor oil, 0.5 parts of silane coupling agent KH550 and 10 parts of petroleum resin coumarone resin were mixed in a mixer at room temperature for 5 to 10 minutes to obtain mixture 2.

[0045] Example 6 (1) Mix 100 parts of SBS particles, 3 parts of fumaric anhydride (FMA) and 0.08 parts of DCP (diisopropylbenzene peroxide) initiator in a high-speed mixer at room temperature for 5 to 10 minutes to make each component evenly dispersed on the surface of SBS, and obtain mixture 1.

[0046] (2) Prepare functionalized SBS, as in Example 1.

[0047] (3) Mix 100 parts of functionalized SBS, 4 parts of amino-terminated compound cocoyl amine, 20 parts of plasticizer dibutyl phthalate, 50 parts of oily substance furfural extract, 0.1 parts of silane coupling agent KH570, and 20 parts of petroleum resin C9 resin in a mixer at room temperature for 5-10 minutes to obtain mixture 2.

[0048] (4) Add the premixed mixture 2 to a twin-screw extruder for extrusion. Set the temperature to 90°C, 120°C, 130°C, 140°C, 140°C, and the die head temperature to 130°C for extrusion granulation. The screw speed is 180 rpm to obtain the direct-injection fast-melting high-viscosity asphalt modifier.

[0049] (5) Preparation of high viscosity asphalt: Same as in Example 1.

[0050] Example 7 (1) Preparation of functionalized SBS: Same as in Example 1.

[0051] (2) Mix 100 parts of functionalized SBS, 4 parts of amino-terminated compound coconut oil amine, 40 parts of plasticizer T60, 50 parts of furfural extract oil, 0.1 parts of silane coupling agent KH560, and 40 parts of petroleum resin rosin resin in a mixer at room temperature for 5-10 minutes to obtain mixture 2.

[0052] (3) Add the premixed mixture 2 to a twin-screw extruder for extrusion. Set the temperature to 90°C, 120°C, 130°C, 140°C, 140°C, and the die head temperature to 130°C for extrusion granulation. The screw speed is 180 rpm to obtain the direct-injection fast-melting high-viscosity asphalt modifier.

[0053] (4) Preparation of high viscosity asphalt: Same as in Example 1.

[0054] Example 8 (1) Preparation of mixture 1: Same as in Example 1.

[0055] (2) Mix 4 parts of the amino-terminated compound hexadecylamine, 20 parts of the plasticizer dioctyl phthalate, 50 parts of the oily substance aromatic oil, and 0.1 parts of the silane coupling agent KH560. 、 20 parts of petroleum resin C5 resin were mixed in a mixer at room temperature for 5-10 minutes to obtain mixture 2.

[0056] (3) The premixed mixture 1 and mixture 2 are added to a twin-screw extruder for extrusion. The screw speed is 180 rpm. The twin-screw extruder has five temperature zones. The temperatures of the first to fifth temperature zones along the material running direction are set as follows: 95°C, 140°C, 160°C, 140°C, and 130°C, respectively. The die head temperature is 130°C. Mixture 1 is added in the first temperature zone, and mixture 2 is added while extruding in the second temperature zone. The feed rate is about 35 kg / h. After extrusion and granulation, a direct-feed, fast-melting, high-viscosity asphalt modifier is obtained.

[0057] (4) Preparation of high viscosity asphalt: Same as in Example 1.

[0058] Comparative Example 1 Add 15 parts of commercially available high-viscosity modifier TAFPACK-Super (TPS) to 100 parts of 70# base asphalt, and add 0.2 parts of commercial stabilizer. Stir at 180℃ for 40 minutes to obtain high-viscosity asphalt.

[0059] Comparative Example 2 15 parts of the GMA-functionalized SBS polymer prepared in step (2) of Example 1 were added to 100 parts of 70# base asphalt, and 0.2 parts of commercial stabilizer were added. The mixture was stirred at 180°C for 40 min to obtain high viscosity asphalt.

[0060] Comparative Example 3 High-viscosity asphalt was prepared according to the method of Example 1, except that the hexadecylamine in step (3) was replaced with an equal mass of diethylamine.

[0061] Comparative Example 4 High-viscosity asphalt was prepared according to the method of Example 1, except that the hexadecylamine in step (3) was replaced with an equal mass of n-decylamine.

[0062] Performance verification 1. High viscosity melt index test The melt flow rate (MFR) of the direct-injection, rapid-melting, high-viscosity asphalt modifiers prepared in Examples 1-8 and the asphalt modifiers used in Comparative Examples 1-4 were tested. The experimental method was as follows: the entire process of sample heating, loading, and measurement was completed using a melt flow rate meter (Gottfertmi-2.2) according to GB / T3682-2000. The test conditions were: temperature: 190℃; load: 5kg; die: inner diameter: 2.095mm, outer diameter: 9.550mm, length: 8.000mm.

[0063] The experimental results are shown in Table 1 below.

[0064] Table 1 2. Conventional physical property tests of high-viscosity asphalt The penetration, ductility, softening point, dynamic viscosity at 60℃, and segregation of the high-viscosity asphalt obtained in each embodiment and comparative example were tested. The penetration was tested using the method described in GB / T 0604, the ductility was tested using the method described in GB / T 0605, the softening point was tested using the method described in GB / T 0606, the dynamic viscosity at 60℃ was tested using the method described in GB / T 0620, and the segregation was tested using the method described in GB / T 0661.

[0065] The experimental results are shown in Table 2 below. As can be seen from the results in Table 2, the modified asphalt prepared using the fast-melting high-viscosity asphalt modifier prepared in this invention has conventional properties (softening point, ductility and penetration) and dynamic viscosity at 60℃ that meet the technical requirements for high-viscosity asphalt. The thermal storage stability (segregation) is less than 2.5°C, and it has good stability at high temperatures.

[0066] Table 2

Claims

1. A method for preparing a multi-grafted comb copolymer, characterized in that: Functionalized elastomers, hydroxyl-terminated compounds, or amino-terminated compounds are mixed and melt-extruded in a twin-screw extruder to obtain multi-grafted comb copolymers.

2. The preparation method according to claim 1, characterized in that: The functionalized elastomer has a molecular weight of 80,000 to 150,000; preferably, the elastomer is a linear triblock copolymer, preferably SBS or SIS; preferably, the functional group is an anhydride group, a carboxylic acid group or an epoxy group.

3. The preparation method according to claim 1, characterized in that: The hydroxyl-terminated compound is at least one of a polyether polyol with a molecular weight of 200-600 and a hydroxyl-terminated polybutadiene. The polyether polyol includes at least one of polyethylene glycol, polypropylene glycol, and polycaprolactone polyol. Preferably, the amino-terminated compound is at least one of a polyether amine, an amino-terminated polyisoprene, an amino-terminated polybutadiene, a C12-C18 fatty amine, a cocoyl amine, or a C12-C18 amide.

4. The preparation method according to claim 1, characterized in that: When the compound is a hydroxyl-terminated compound, the reaction requires the use of a catalyst, which is one or more of dibutyltin dilaurate, dimethylaminoethyl ether, N-ethylmorpholine, etc.; preferably, the mass ratio of the functionalized elastomer to the catalyst is 100:0.005-0.

02.

5. The preparation method according to claim 1, characterized in that: The mass ratio of the functionalized elastomer to the hydroxyl-terminated or amino-terminated compound is 100:1-10.

6. The preparation method according to claim 1, characterized in that: The raw materials react during the extrusion process in the twin-screw extruder. The twin-screw extruder has a total of 5 temperature zones. The temperatures of each temperature zone along the material running direction are as follows: 85-95℃, 100~140℃, 130~160℃, 140~160℃, and 140~155℃. The die head temperature is 140~155℃.

7. A direct-dispensing, fast-dissolving, high-viscosity asphalt modifier, characterized in that: Including multi-grafted comb copolymers prepared according to any one of claims 1-6.

8. The direct-injection, fast-dissolving, high-viscosity asphalt modifier according to claim 7, characterized in that: It consists of the following components in parts by weight: 100 parts of multi-grafted comb copolymer 20-50 parts of oily substances 10-20 parts plasticizer 0.1-0.5 parts of coupling agent 5-20 parts of petroleum resin.

9. The direct-injection, fast-dissolving, high-viscosity asphalt modifier according to claim 8, characterized in that: The oil is one or more of naphthenic oil, aromatic oil, furfural extract oil, reduced-density oil, reduced-density oil, and castor oil; the plasticizer is one or more of dioctyl phthalate, dibutyl phthalate, environmentally friendly plasticizer T60, and epoxidized soybean oil; the coupling agent is at least one of KH 550, KH560, and KH570; and the petroleum resin is one or more of C5 resin, C9 resin, C5 / C9 copolymer resin, rosin resin, terpene resin, and coumarone resin.

10. A high-viscosity asphalt, characterized in that... It includes base asphalt and the direct-injection, fast-dissolving, high-viscosity asphalt modifier as described in claim 9.

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