Modifier for pavement and preparation method thereof

Abstract

The invention relates to the technical field of pavement materials, in particular to a pavement modifier and a preparation method thereof. The weight ratio of a component A to a component B in the modifier is 1: (0.75-0.9); the component A comprises the following components in parts by weight: 100 parts of polyurethane modified epoxy resin and 4-7 parts of an epoxy active diluent, and the component B comprises the following components in parts by weight: 6-10 parts of an accelerant, 80-90 parts of a composite curing agent and 5-8 parts of a diluent; in the composite curing agent, the weight ratio of the organic silicon amine curing agent to the aliphatic amine curing agent is (1-2): 1; the organic silicon amine curing agent is obtained by taking tris (2-aminoethyl) amine, hexamethylene diisocyanate and 1, 3-bis (3-aminopropyl)-1, 1, 3, 3-tetramethyldisiloxane as raw materials and reacting according to a molar ratio of 1: 3: 3. The modifier disclosed by the invention is good in toughness and high in strength, can effectively improve the low-temperature performance, flame retardance and stability of asphalt, and meets specific construction requirements.

Description

Technical Field

[0001] The present invention relates to the technical field of pavement materials, in particular to a pavement modifier and a preparation method thereof. Background Art

[0002] Asphalt is one of the most commonly used materials in pavement construction and maintenance. However, due to its inherent physical properties, asphalt tends to soften when heated and crack easily at low temperatures. Long-term exposure to extreme temperatures and the stresses of heavy haulage traffic can lead to rutting, cracking, and fatigue damage on asphalt pavements, seriously impacting road safety.

[0003] To improve the performance of asphalt, it is often modified by adding polymers. Epoxy asphalt is a mixture of epoxy resin, a curing agent, and modified base asphalt. Epoxy resin is a thermosetting resin that reacts with a curing agent to form a continuous, cross-linked, three-dimensional network structure. Asphalt is bound within the cross-linked network as a dispersed phase, overcoming the problem of asphalt softening due to heat and effectively increasing the strength of the asphalt. Chinese patent CN202210686958.5 discloses an economical, low-temperature-resistant, and highly flexible epoxy asphalt material and its preparation method. The invention attempts to improve the performance of epoxy resin by using 1-piperazineethylamine as a modifier and 1-amino-9-octadecene as an active curing agent, thereby increasing the asphalt's low-temperature resistance and toughness. Chinese patent CN202410245664.8 modifies epoxy resin by adding a reactive toughening agent. However, the modifiers provided in the aforementioned patents have limited effects on asphalt modification and cannot meet the various requirements in practical applications. Summary of the Invention

[0004] The object of the present invention is to provide a pavement modifier and a preparation method thereof, so as to solve the problems raised in the above background technology.

[0005] In order to solve the above technical problems, the present invention provides the following technical solution: a method for preparing a pavement modifier, comprising the following steps: Step 1: S11: After vacuum dehydrating the polyether polyol at 110-120° C., diisocyanate and polyether polyol are mixed under nitrogen protection, and reacted at 65-70° C. for 3-5 hours using dibutyltin dilaurate as a catalyst to obtain an isocyanate-terminated polyurethane prepolymer; S12: reacting the isocyanate-terminated polyurethane prepolymer with the epoxy resin at 80-100° C. with stirring for 6-9 hours to obtain a polyurethane-modified epoxy resin; Step 2: S21: Disperse tris(2-aminoethyl)amine in acetone, add hexamethylene diisocyanate under nitrogen protection, control the temperature at 40-50°C to react for 1-2 hours, add 1,3-bis(3-aminopropyl)-1,1,3,3-tetramethyldisiloxane while maintaining the temperature, continue the reaction for 1-2 hours, and remove the acetone by rotary evaporation to obtain an organosilicon amine curing agent; S22: mixing an organosilicon amine curing agent and an aliphatic amine curing agent to obtain a composite curing agent; Step 3: S31: mixing a polyurethane-modified epoxy resin and an epoxy reactive diluent to obtain component A; S32: Mixing the accelerator, the composite curing agent, and the diluent to obtain component B; S33: Component A and component B are mixed to obtain a pavement modifier.

[0006] Furthermore, in S11, diisocyanate and polyether polyol are mixed in a molar ratio of 1:(0.5-0.8).

[0007] Furthermore, in S11, the polyether polyol is any one or more of polyethylene glycol, polypropylene glycol, and polytetramethylene ether glycol; and the diisocyanate is any one or more of isophorone diisocyanate, toluene diisocyanate, diphenylmethane diisocyanate, and hexamethylene diisocyanate.

[0008] Furthermore, in S12, the content of each component in the polyurethane-modified epoxy resin is, by weight percentage, 10-15% of isocyanate-terminated polyurethane prepolymer and 85-90% of epoxy resin.

[0009] Furthermore, in S21, the molar ratio of tris(2-aminoethyl)amine, hexamethylene diisocyanate, and 1,3-bis(3-aminopropyl)-1,1,3,3-tetramethyldisiloxane is 1:3:3.

[0010] Furthermore, in S22, the weight ratio of the organosilicon amine curing agent to the aliphatic amine curing agent is (1-2):1.

[0011] Furthermore, in S22, the aliphatic amine curing agent is any one or more of octadecyl primary amine, oleylamine, decylamine, and cardanol aldehyde amine.

[0012] Furthermore, in S31, in component A, the contents of each component are, by weight, 100 parts of polyurethane-modified epoxy resin and 4 to 7 parts of epoxy reactive diluent.

[0013] Furthermore, in S31, the epoxy reactive diluent is any one or more of phenyl glycidyl ether, benzyl alcohol glycidyl ether, cardanol glycidyl ether, castor oil triglycidyl ether, and epoxy soybean oil.

[0014] Further, in S32, the component B includes 6-10 parts of accelerant, 80-90 parts of composite curing agent and 5-8 parts of diluent by weight.

[0015] Further, in S32, the accelerant is any one or more of tertiary amine accelerant, phenolic accelerant and imidazole accelerant; and the diluent is benzyl alcohol.

[0016] Further, in S33, the component A and the component B are mixed in a weight ratio of 1:(0.75-0.9).

[0017] Compared with the prior art, the present application has the beneficial effects that the present application provides a modifier for road surface and a preparation method thereof, the modifier for road surface includes a component A and a component B, the weight ratio of the component A to the component B is 1:(0.75-0.9); wherein the main component in the component A is polyurethane modified epoxy resin, and the main component in the component B is curing agent.

[0018] The component A includes 100 parts of polyurethane modified epoxy resin and 4-7 parts of epoxy active diluent by weight; wherein the polyurethane modified epoxy resin is prepared by mixing isocyanate-terminated polyurethane prepolymer and epoxy resin, the active isocyanate groups on the prepolymer can chemically react with the hydroxyl groups on the side chain of the epoxy resin, the polyurethane segment has good low-temperature flexibility, which helps to improve the toughness of the epoxy resin in low-temperature environment. The epoxy active diluent is selected from phenyl glycidyl ether, benzyl alcohol glycidyl ether, cashew phenol glycidyl ether, castor oil triglycidyl ether, epoxy soybean oil and the like, which has similar chemical structure with saturated hydrocarbons and aromatic hydrocarbons in asphalt, not only has good compatibility with asphalt, but also has good dilution effect on the epoxy resin, and improves the compatibility between different components.

[0019] The component B includes 6-10 parts of accelerant, 80-90 parts of composite curing agent and 5-8 parts of diluent by weight; wherein the composite curing agent includes organic silicone amine curing agent and aliphatic amine curing agent, the organic silicone amine curing agent is obtained by sequentially reacting tris(2-aminoethyl)amine, hexamethylene diisocyanate and 1,3-bis(3-aminopropyl)-1,1,3,3-tetramethyl disiloxane, the hexamethylene diisocyanate is aliphatic diisocyanate, which has longer segment structure, and the siloxane also has flexibility, and the two can synergistically improve the flexibility of the main chain. Compared with the single diamine curing agent, the organic silicone amine curing agent in the present application can provide more reaction sites, so as to form a network-like chemical cross-linking structure faster in the curing process, and improve the cross-linking density.

[0020] Among the existing modifiers, macromolecular end-epoxy rubber is usually used as a toughening agent for epoxy resin. The macromolecular rubber is introduced into the epoxy resin through the reaction between the epoxy groups. However, due to the poor compatibility between the two and the uneven dispersion of the macromolecular rubber segments in the epoxy resin after curing, the toughening effect is limited. In the present invention, polyurethane segments are used to toughen the side chains of the epoxy resin, and silicone with better flexibility is introduced as a curing agent. As the curing reaction proceeds, the main chain and the side chain are physically intertwined to form a dense cross-linked interpenetrating structure, which further improves the strength and toughness of the epoxy resin. In addition, researchers have found that organosilicon amine curing agents also have certain flame retardancy. After being mixed with asphalt, the limiting oxygen index reaches more than 27%. Analysis shows that the reason may be that the N and Si elements synergistically improve the flame retardant effect. The modifier prepared by the present invention has good compatibility with asphalt, effectively improving the low-temperature performance, flame retardancy and stability of asphalt, and meeting specific construction requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings: Figure 1 It is a reaction flow chart of the organosilicon amine curing agent of the present invention. DETAILED DESCRIPTION

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] Materials used in the present invention and their sources: the epoxy resin is bisphenol F epoxy resin, a standard BPF resin, model HL-170, from Zhejiang Hongli New Materials Co., Ltd.; the polyethylene glycol is polyethylene glycol 1000, from Suzhou Kemei Biosynthesis Co., Ltd.

[0024] Example 1: A method for preparing a pavement modifier, comprising the following steps: Step 1: S11: After vacuum dehydrating the polyethylene glycol at 110° C., isophorone diisocyanate and polyethylene glycol were mixed at a molar ratio of 1:0.5 under nitrogen protection, and reacted at 65° C. for 3 h using dibutyltin dilaurate as a catalyst to obtain an isocyanate-terminated polyurethane prepolymer; S12: stirring and reacting an isocyanate-terminated polyurethane prepolymer and an epoxy resin at 80° C. for 6 hours to obtain a polyurethane-modified epoxy resin; the polyurethane-modified epoxy resin comprises the following components in a weight percentage: 10% isocyanate-terminated polyurethane prepolymer and 90% epoxy resin; Step 2: S21: Disperse tris(2-aminoethyl)amine in acetone, add hexamethylene diisocyanate under nitrogen protection, control the temperature at 40°C to react for 1 hour, add 1,3-bis(3-aminopropyl)-1,1,3,3-tetramethyldisiloxane while maintaining the temperature, continue the reaction for 1 hour, and remove the acetone by rotary evaporation to obtain an organosilicon amine curing agent; wherein the molar ratio of tris(2-aminoethyl)amine, hexamethylene diisocyanate, and 1,3-bis(3-aminopropyl)-1,1,3,3-tetramethyldisiloxane is 1:3:3; S22: mixing an organosilicon amine curing agent and octadecyl primary amine in a weight ratio of 1:1 to obtain a composite curing agent; Step 3: S31: Mixing 10 kg of polyurethane-modified epoxy resin and 0.4 kg of castor oil triglycidyl ether by weight to obtain component A; S32: Mix 0.6 kg of tetradecyl tertiary amine, 8 kg of a composite curing agent, and 0.5 kg of benzyl alcohol, by weight, to obtain component B; S33: Component A and component B are mixed in a weight ratio of 1:0.75 to obtain a pavement modifier.

[0025] Example 2: A method for preparing a pavement modifier, comprising the following steps: Step 1: S11: After vacuum dehydration of polyethylene glycol at 115° C., isophorone diisocyanate and polyethylene glycol were mixed at a molar ratio of 1:0.75 under nitrogen protection, and reacted at 68° C. for 4.5 hours using dibutyltin dilaurate as a catalyst to obtain an isocyanate-terminated polyurethane prepolymer; S12: stirring and reacting an isocyanate-terminated polyurethane prepolymer and an epoxy resin at 90° C. for 7 hours to obtain a polyurethane-modified epoxy resin; the polyurethane-modified epoxy resin comprises, by weight percentage, 12% of the isocyanate-terminated polyurethane prepolymer and 88% of the epoxy resin; Step 2: S21: Disperse tris(2-aminoethyl)amine in acetone, add hexamethylene diisocyanate under nitrogen protection, control the temperature at 45°C to react for 1.5 hours, add 1,3-bis(3-aminopropyl)-1,1,3,3-tetramethyldisiloxane while maintaining the temperature, continue the reaction for 1.5 hours, and remove the acetone by rotary evaporation to obtain an organosilicon amine curing agent; wherein the molar ratio of tris(2-aminoethyl)amine, hexamethylene diisocyanate, and 1,3-bis(3-aminopropyl)-1,1,3,3-tetramethyldisiloxane is 1:3:3; S22: mixing an organosilicon amine curing agent and octadecyl primary amine in a weight ratio of 1.5:1 to obtain a composite curing agent; Step 3: S31: Mixing 10 kg of polyurethane-modified epoxy resin and 0.5 kg of castor oil triglycidyl ether by weight to obtain component A; S32: Mix 0.8 kg of tetradecyl tertiary amine, 8.5 kg of a composite curing agent, and 0.7 kg of benzyl alcohol, by weight, to obtain component B; S33: Component A and component B are mixed in a weight ratio of 1:0.8 to obtain a pavement modifier.

[0026] Example 3: A method for preparing a pavement modifier, comprising the following steps: Step 1: S11: After vacuum dehydrating the polyethylene glycol at 120° C., isophorone diisocyanate and polyethylene glycol were mixed at a molar ratio of 1:0.8 under nitrogen protection, and reacted at 70° C. for 5 h using dibutyltin dilaurate as a catalyst to obtain an isocyanate-terminated polyurethane prepolymer; S12: stirring and reacting an isocyanate-terminated polyurethane prepolymer and an epoxy resin at 100° C. for 9 hours to obtain a polyurethane-modified epoxy resin; the polyurethane-modified epoxy resin comprises, by weight percentage, 15% of the isocyanate-terminated polyurethane prepolymer and 85% of the epoxy resin; Step 2: S21: Disperse tris(2-aminoethyl)amine in acetone, add hexamethylene diisocyanate under nitrogen protection, control the temperature at 50°C to react for 2 hours, add 1,3-bis(3-aminopropyl)-1,1,3,3-tetramethyldisiloxane while maintaining the temperature, continue the reaction for 2 hours, and remove the acetone by rotary evaporation to obtain an organosilicon amine curing agent; wherein the molar ratio of tris(2-aminoethyl)amine, hexamethylene diisocyanate, and 1,3-bis(3-aminopropyl)-1,1,3,3-tetramethyldisiloxane is 1:3:3; S22: mixing an organosilicon amine curing agent and octadecyl primary amine in a weight ratio of 2:1 to obtain a composite curing agent; Step 3: S31: 10 kg of polyurethane modified epoxy resin, 0.7 kg of castor oil triglycidyl ether were mixed to obtain component A according to the weight fraction; S32: 0.1 kg of myristyl tertiary amine, 9 kg of composite curing agent, 0.8 kg of benzyl alcohol were mixed to obtain component B according to the weight fraction; S33: Component A and component B were mixed according to the weight ratio of 1:0.9 to obtain a modifier for pavement.

[0027] Comparative Example 1: The isocyanate group terminated polyurethane prepolymer was not used to modify the epoxy resin, and the remaining parameters were the same as those in Example 1.

[0028] Step 1: S11: Tris(2-aminoethyl)amine was dispersed in acetone, and hexamethylene diisocyanate was added under nitrogen protection, and the temperature was controlled at 40°C for 1h, and then 1,3-bis(3-aminopropyl)-1,1,3,3-tetramethyldisiloxane was added, and the reaction was continued for 1h, and the acetone was removed by rotary evaporation to obtain a silicone amine curing agent; wherein the molar ratio of tris(2-aminoethyl)amine, hexamethylene diisocyanate, 1,3-bis(3-aminopropyl)-1,1,3,3-tetramethyldisiloxane is 1:3:3; S12: The silicone amine curing agent and octadecyl primary amine were mixed according to the weight ratio of 1:1 to obtain a composite curing agent; Step 2: S21: 10 kg of epoxy resin, 0.4 kg of castor oil triglycidyl ether were mixed to obtain component A according to the weight fraction; S22: 0.6 kg of myristyl tertiary amine, 8 kg of composite curing agent, 0.5 kg of benzyl alcohol were mixed to obtain component B according to the weight fraction; S33: Component A and component B were mixed according to the weight ratio of 1:0.75 to obtain a modifier for pavement.

[0029] Comparative Example 2: Octadecyl primary amine was used instead of composite curing agent, and the remaining parameters were the same as those in Example 2.

[0030] Step 1: S11: After vacuum dehydration of polyethylene glycol at 115°C, isophorone diisocyanate and polyethylene glycol were mixed according to the molar ratio of 1:0.75 under nitrogen protection, and dibutyltin dilaurate was used as a catalyst to react at 68°C for 4.5h to obtain an isocyanate group terminated polyurethane prepolymer; S12: stirring and reacting an isocyanate-terminated polyurethane prepolymer and an epoxy resin at 90° C. for 7 hours to obtain a polyurethane-modified epoxy resin; the polyurethane-modified epoxy resin comprises, by weight percentage, 12% of the isocyanate-terminated polyurethane prepolymer and 88% of the epoxy resin; Step 2: S21: Mix 10 kg of polyurethane-modified epoxy resin and 0.5 kg of castor oil triglycidyl ether by weight to obtain component A; S22: Mix 0.8 kg of tetradecyl tertiary amine, 8.5 kg of octadecyl primary amine, and 0.7 kg of benzyl alcohol in parts by weight to obtain component B; S23: Component A and component B are mixed in a weight ratio of 1:0.8 to obtain a pavement modifier.

[0031] Comparative Example 3: A modifier was prepared using conventional technology, i.e., epoxy-terminated rubber (from Shanghai Huanyang Chemical Technology Co., Ltd., brand Huntsman, model number ETBN 1300X68) was used instead of the isocyanate-terminated polyurethane prepolymer as the toughening agent, and octadecyl primary amine was used instead of the composite curing agent. The remaining parameters were the same as in Example 3.

[0032] Step 1: The epoxy-terminated rubber and the epoxy resin are mixed to obtain a rubber / epoxy resin mixture; the rubber / epoxy resin mixture comprises, by weight percentage, 15% of the epoxy-terminated rubber and 85% of the epoxy resin; Step 2: S21: Mix 10 kg of the rubber / epoxy resin mixture and 0.7 kg of castor oil triglycidyl ether, by weight, to obtain component A; S22: Mix 0.1 kg of tetradecyl tertiary amine, 9 kg of octadecyl primary amine, and 0.8 kg of benzyl alcohol, by weight, to obtain component B; S23: Component A and component B are mixed in a weight ratio of 1:0.9 to obtain a pavement modifier.

[0033] The pavement modifiers prepared in Examples 1 to 3 and Comparative Examples 1 to 3 were experimentally characterized.

[0034] Experiment 1: The pavement modifiers in Examples 1 to 3 and Comparative Examples 1 to 3 were heated to 60°C, and then mixed with 70# base asphalt at 150°C in a mass ratio of 1:1 to obtain modified asphalt; the mixed modified asphalt was poured into a mold (25cm×25cm×2mm), cured at 150°C, and taken out and cut into tensile specimens using a dumbbell-shaped specimen cutter. The tensile strength and elongation at break were tested at a test temperature of 25°C and a tensile rate of 500mm / min; the limiting oxygen index was used to characterize the flame retardant properties of the samples. The experimental results are shown in Table 1.

[0035] Table 1. Test results of modified asphalt performance Experiment 2: The modified asphalt from Experiment 1 was mixed with aggregate and mineral powder (aggregate from Jiangsu Jurong Maodi Group Co., Ltd., mineral powder from Shandong Kefa Building Materials Co., Ltd., both EA-10 grade) in a weight ratio of 7:84:9. The mixture was heated to 170°C, mixed for 1 minute, compacted using a roller roller method, and cured at 60°C for 3 days to produce a modified asphalt mixture. The Marshall stability, Marshall flow value (60°C, 50 mm / min), and low-temperature flexural strain (-10°C, 1 mm / min) of the modified asphalt mixture were tested according to the JTG E20-2011 standard. The experimental results are shown in Table 2.

[0036] Table 2. Performance test results of modified asphalt mixture Conclusion: The data from Examples 1-3 and Comparative Examples 1-3 demonstrate that the pavement modifier prepared by the present invention can effectively improve the performance of asphalt. The data from Example 1 and Comparative Example 1 show that the use of an isocyanate-terminated polyurethane prepolymer as a toughening agent significantly improves the performance of both modified asphalt and modified asphalt mixtures. The data from Example 2 and Comparative Example 2 demonstrate that the organosilicon amine curing agent effectively improves the performance of modified asphalt and modified asphalt mixtures, while also enhancing the flame retardancy of the modified asphalt. The data from Example 3 and Comparative Example 3 demonstrate that the modifier prepared by the present invention exhibits superior asphalt modification effects compared to modifiers prepared using conventional methods.

[0037] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0038] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A method for preparing a road surface modifier, characterized in that: The following steps are involved: Step 1: Mix 100 parts of polyurethane-modified epoxy resin and 4 to 7 parts of epoxy reactive diluent by weight to obtain component A; Step 2: Mix 6-10 parts of an accelerator, 80-90 parts of a composite curing agent, and 5-8 parts of a diluent by weight to obtain component B; the composite curing agent is obtained by mixing an organosilicon amine curing agent and an aliphatic amine curing agent in a weight ratio of (1-2):1; S33: Component A and component B are mixed in a weight ratio of 1:(0.75-0.9) to obtain a pavement modifier.

2. The method for preparing a road surface modifier according to claim 1, wherein: In step 1, the polyurethane-modified epoxy resin is obtained by stirring and reacting an isocyanate-terminated polyurethane prepolymer and an epoxy resin at 80-100° C. for 6-9 hours; the content of each component in the polyurethane-modified epoxy resin is, by weight percentage, 10-15% of the isocyanate-terminated polyurethane prepolymer and 85-90% of the epoxy resin.

3. The method for preparing a road surface modifier according to claim 2, wherein: The preparation method of the isocyanate-terminated polyurethane prepolymer comprises: vacuum dehydrating polyether polyol at 110-120°C, mixing diisocyanate and polyether polyol in a molar ratio of 1:(0.5-0.8) under nitrogen protection, using dibutyltin dilaurate as a catalyst, reacting at 65-70°C for 3-5 hours to obtain the isocyanate-terminated polyurethane prepolymer.

4. The method for preparing a road surface modifier according to claim 3, wherein: The polyether polyol is any one or more of polyethylene glycol, polypropylene glycol, and polytetramethylene ether glycol; the diisocyanate is any one or more of isophorone diisocyanate, toluene diisocyanate, diphenylmethane diisocyanate, and hexamethylene diisocyanate.

5. The method for preparing a road surface modifier according to claim 1, wherein: In step 1, the epoxy reactive diluent is any one or more of phenyl glycidyl ether, benzyl alcohol glycidyl ether, cardanol glycidyl ether, castor oil triglycidyl ether, and epoxidized soybean oil.

6. The method for preparing a road surface modifier according to claim 1, characterized in that: In step 2, the preparation method of the organosilicon amine curing agent is as follows: tris(2-aminoethyl)amine is dispersed in acetone, hexamethylene diisocyanate is added under nitrogen protection, the temperature is controlled at 40-50°C for reaction for 1-2 hours, 1,3-bis(3-aminopropyl)-1,1,3,3-tetramethyldisiloxane is added while maintaining the temperature, the reaction is continued for 1-2 hours, and the acetone is removed by rotary evaporation to obtain the organosilicon amine curing agent.

7. The method for preparing a road surface modifier according to claim 6, characterized in that: Tris(2-aminoethyl)amine, hexamethylene diisocyanate, and 1,3-bis(3-aminopropyl)-1,1,3,3-tetramethyldisiloxane were reacted in a molar ratio of 1:3:

3.

8. The method for preparing a road surface modifier according to claim 1, characterized in that: The accelerator is any one or more of a tertiary amine accelerator, a phenol accelerator, and an imidazole accelerator.

9. The method for preparing a road surface modifier according to claim 1, characterized in that: The diluent is benzyl alcohol.

10. A road surface modifier prepared by the preparation method according to any one of claims 1 to 9.

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