A road preventive maintenance coating material and preparation method

Abstract

The present invention relates to the technical field of road maintenance, and proposes a preventive road maintenance coating material and a preparation method. The maintenance coating material includes furfural extracted oil, SBS modified asphalt, stearyl chloride modified rubber powder, lignin, fine aggregate and a phosphate coupling agent. The stearyl chloride modified rubber powder has good elasticity and flexibility, and can form an elastic network in the coating to reduce the possibility of rutting. Lignin enhances the overall strength and rigidity of the coating, and works together with the rubber powder to improve the coating's ability to resist rutting. The fine aggregate also forms a rough texture on the coating surface, increasing the friction between the tire and the coating. The phosphate coupling agent ensures good bonding between the components, enabling them to synergistically exert anti-rutting and anti-skid effects, ensuring that the coating can remain flat during long-term use, and improving the coating's service life.

Description

Technical Field

[0001] The present invention relates to the technical field of road maintenance, and in particular to a road preventive maintenance coating material and a preparation method thereof. Background Art

[0002] With the rapid development of transportation infrastructure, the long-term durability and safety of roads are receiving increasing attention. Preventive road maintenance coating materials are functional materials specifically applied to road surfaces to slow the early stages of road damage and deterioration. By forming a thin protective film on the road surface, this type of material can effectively block the penetration of moisture, oxygen, and other harmful media, preventing early road damage such as cracks, crazing, and aging, thereby extending the service life of the road. Preventive maintenance coatings are commonly used in areas such as highways, urban roads, bridge decks, and expressways, and are particularly suitable for the early care and maintenance of lightly or moderately damaged road surfaces.

[0003] Although existing road maintenance coating materials can improve the protective performance of the road surface to a certain extent, effectively delay road aging and resist wind and rain erosion. However, with the continuous increase in traffic volume and the popularity of heavy-loaded vehicles, the pressure on the road surface continues to increase, and the performance limitations of existing coating materials are becoming increasingly prominent. For example, the coating materials that are currently widely used still have deficiencies in anti-skid performance and cannot provide a long-lasting and reliable anti-skid layer for roads. They are prone to traffic safety hazards in slippery environments such as rain and snow. Secondly, the rutting resistance of this type of coating is relatively weak. Under long-term high temperature and heavy load, rutting and plastic deformation are easily formed in the wheel rolling area, which in turn affects the flatness and service life of the road surface. In response to these problems, it is particularly important to develop a high-strength, anti-skid road preventive maintenance coating material and a scientific preparation method thereof. Summary of the Invention

[0004] In view of this, the present invention proposes a high-strength, anti-skid road preventive maintenance coating material and a preparation method thereof.

[0005] The technical solution of the present invention is achieved as follows: On the one hand, the present invention provides a road preventive maintenance coating material, including furfural extracted oil, SBS modified asphalt, stearyl chloride modified rubber powder, lignin, fine aggregate and phosphate coupling agent.

[0006] Rubber itself possesses excellent elasticity, effectively alleviating and dissipating stress concentrations caused by traffic loads, thermal expansion, and contraction, thereby reducing the risk of cracking. Modification of rubber powder with stearyl chloride introduces groups such as long-chain alkyl groups, similar to the molecular structure of asphalt. These groups enhance the intermolecular forces between the modified rubber powder and asphalt, improving their compatibility. The modified polymer segments are more evenly distributed, allowing the coating to maintain a continuous, complete elastic network structure despite repeated wheel rolling and temperature fluctuations. The modified rubber powder also inhibits the fluidity of asphalt at high temperatures, preventing rutting, while enhancing the material's flexibility at low temperatures and preventing brittle cracking. This helps the coating maintain excellent mechanical properties over the long term in hot and cold weather and extreme climates.

[0007] SBS modified asphalt constitutes the main matrix and film-forming material, playing an overall wrapping and protective role; fine aggregate and lignin form a skeleton, improving structural strength and preventing high-temperature rheology and deformation under external pressure. Fine aggregate can also be "embedded" into the coating surface to increase roughness, providing stable and sufficient friction even during long-term driving and rainy and snowy weather. Combined with rubber powder, it enhances wear resistance and achieves long-term anti-skid performance. Lignin also enhances the overall strength and rigidity of the coating, and works together with rubber powder to improve the coating's ability to resist rutting. Phosphate coupling agents ensure good bonding between the various components, enabling them to synergistically exert anti-rutting and anti-skid effects, ensuring that the coating remains flat during long-term use and improving the coating's fatigue resistance and service life.

[0008] In summary, the components in the road preventive maintenance coating material achieve high strength, anti-rutting and anti-skid properties through their own unique effects and synergistic effects with each other.

[0009] Based on the above technical solution, preferably, calculated by weight, the coating material includes: 8-10 parts of furfural extracted oil, 20-30 parts of SBS modified asphalt, 8-15 parts of stearyl chloride modified rubber powder, 5-8 parts of lignin, 30-50 parts of fine aggregate, and 0.5-3 parts of phosphate coupling agent.

[0010] Based on the above technical solution, preferably, the preparation method of stearyl chloride modified rubber powder is: plasma-treating rubber powder to obtain activated rubber powder, then mixing the activated rubber powder with stearyl chloride and an organic solvent for reaction, and after the reaction is completed, filtering, washing, and drying to obtain stearyl chloride modified rubber powder.

[0011] On the basis of the above technical solution, preferably, the plasma treatment is arc plasma treatment at a DC voltage of 30-50 kV for 5-10 minutes.

[0012] The rubber powder plasma gives the rubber powder surface rich active groups and rough structures, which improves the efficiency of subsequent chemical modification; it also enhances the bonding and dispersion ability of rubber powder and other components (such as stearyl chloride, asphalt, aggregate, etc.), so that the modified rubber powder can better play the role of enhancing mechanical properties, anti-rutting and anti-skid in road preventive maintenance coating materials.

[0013] Based on the above technical solution, preferably, the mass ratio of the activated rubber powder: stearyl chloride: organic solvent is 20-50:4-10:100-200, and the organic solvent is one of toluene and xylene.

[0014] On the basis of the above technical solution, preferably, the lignin is lignin modified by hydrolyzed polymaleic anhydride.

[0015] Based on the above technical solution, preferably, the preparation method of the hydrolyzed polymaleic anhydride modified lignin is: dissolving the hydrolyzed polymaleic anhydride in an alcohol solvent, adjusting the pH of the mixed solution to 4-6, adding lignin, and reacting at 60-80°C for 6-8h. After the reaction is completed, washing and drying the product to obtain modified lignin.

[0016] Hydrolyzed polymaleic anhydride contains active groups such as carboxyl groups. Modified lignin enhances its interfacial compatibility with polymer matrices or other materials, improves the dispersibility of lignin in composite materials, reduces phase separation, and thus improves the overall performance of the composite material. The modified lignin, as a reinforcing skeleton material, can build a microscopic spatial network within the material system, improving the composite's ability to resist rutting, deformation, and compaction. Modified lignin, combined with fine aggregate, improves the surface roughness and friction properties of the coating. Its good dispersibility also allows for a more even distribution of anti-skid particles, making them less likely to fall off. The acidic groups react more effectively with asphalt and even phosphate coupling agents at the interface, increasing the coating's bonding strength and reducing interfacial peeling. Lignin itself has strong antioxidant properties, and the modified acidic groups further enhance its stability, effectively resisting degradation caused by environmental factors such as ultraviolet rays and oxidation. Based on the above technical solution, preferably, the mass ratio of hydrolyzed polymaleic anhydride to lignin is 1:10-20, the mass ratio of hydrolyzed polymaleic anhydride to alcohol solvent is 1:15-20, and the alcohol solvent is ethanol or isopropanol.

[0017] Based on the above technical solution, preferably, the fine aggregate is one or more of quartz sand, basalt sand, and corundum, with a particle size of 50-100 mesh; the particle size of the rubber powder is 80~200 mesh; and the phosphate coupling agent is one or more of triphenyl phosphate, tri(n-butyl) phosphate, and tri(ethyl) phosphate.

[0018] On the other hand, the present invention also provides a method for preparing a preventive road maintenance coating material, comprising heating SBS modified asphalt to 100-120°C, sequentially adding furfural extracted oil, stearyl chloride modified rubber powder, hydrolyzed polymaleic anhydride modified lignin, fine aggregate and phosphate coupling agent, and stirring evenly to obtain a maintenance coating material.

[0019] The road preventive maintenance coating material and preparation method of the present invention have the following beneficial effects compared with the prior art:

[0020] (1) Stearyl chloride modified rubber powder has good elasticity and flexibility, and can form an elastic network in the coating, reducing the possibility of rutting. Lignin enhances the overall strength and rigidity of the coating, and works together with the rubber powder to improve the coating's ability to resist rutting. The skeleton structure of the fine aggregate provides a stable support for the coating, making it less likely to deform when subjected to stress; the fine aggregate also forms a rough texture on the coating surface, increasing the friction between the tire and the coating. The phosphate coupling agent ensures good bonding between the components, enabling them to synergistically play an anti-rutting and anti-skid role, ensuring that the coating can remain flat during long-term use, and improving the coating's fatigue resistance and service life.

[0021] (2) Hydrolyzed polymaleic anhydride modified lignin enhances its interfacial compatibility with the polymer matrix or other materials, reduces phase separation, and thus improves the overall performance of the composite material. The modified lignin also enhances the bonding strength, rutting resistance, and anti-skid properties of the composite material by forming a stronger interaction with the matrix material. DETAILED DESCRIPTION

[0022] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described 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] Furfural extracted oil was asphalt retardant A6 furfural extracted oil, purchased from Shanghai Mingzhi Industrial Co., Ltd.; waste rubber powder was purchased from Jiangsu Zhonghong Environmental Protection Technology Co., Ltd.

[0024] The SBS modified asphalt uses 70#A-grade road petroleum asphalt as the base asphalt and CH301 as the SBS modifier, purchased from Ningbo Changhong Polymer Technology Co., Ltd. The SBS modified asphalt is prepared by heating 1000g of the base asphalt to 160°C until fully melted. SBS (3% by weight of the base asphalt) is then added while stirring. The asphalt is then sheared using a high-speed shear disperser at 180°C and 6000 rpm for 20 minutes. The sheared asphalt is then removed from the disperser and stirred at 180°C for 2 hours. A stabilizer (sulfur, 0.2% by weight of the base asphalt) is then added. Finally, the asphalt is homogenized to obtain the SBS modified asphalt.

[0025] Example 1

[0026] The road preventive maintenance coating material of this embodiment includes 180g of furfural extracted oil, 500g of SBS modified asphalt, 200g of stearyl chloride modified rubber powder, 120g of lignin, 200g of 50-mesh quartz sand, 200g of basalt sand, 400g of corundum and 40g of triphenyl phosphate.

[0027] The preparation method of the stearyl chloride modified rubber powder comprises: subjecting 100-mesh rubber powder to arc plasma treatment at a DC voltage of 40 kV for 10 minutes to obtain activated rubber powder; then taking 200 g of the activated rubber powder, 40 g of stearyl chloride, and 1000 g of toluene for reaction; and after the reaction is completed, filtering, washing, and drying to obtain the stearyl chloride modified rubber powder.

[0028] The preparation method of the above-mentioned road preventive maintenance coating material is: heating SBS modified asphalt to 120°C, then cooling it to maintain a fluid state, adding furfural extracted oil, stearyl chloride modified rubber powder, lignin, quartz sand, basalt sand, corundum and phosphate coupling agent in sequence, and stirring evenly to obtain the maintenance coating material.

[0029] Example 2

[0030] The difference between Example 2 and Example 1 is that the lignin is modified with hydrolyzed polymaleic anhydride, and the amount of hydrolyzed polymaleic anhydride-modified lignin used is 120 g. The modification method is as follows: 10 g of hydrolyzed polymaleic anhydride is dissolved in 180 g of anhydrous ethanol solvent, the pH of the mixture is adjusted to 5, 150 g of lignin is added, and the mixture is reacted at 75°C for 7 hours. After the reaction is completed, the product is removed, washed, and dried to obtain the modified lignin.

[0031] The remaining combinations and steps are the same as in Example 1.

[0032] Example 3

[0033] The road preventive maintenance coating material of this embodiment includes 160g of furfural extracted oil, 440g of SBS modified asphalt, 300g of stearyl chloride modified rubber powder, 100g of hydrolyzed polymaleic anhydride modified lignin, 200g of 100-mesh quartz sand, 200g of basalt sand, 300g of corundum, and 60g of tri(n-butyl) phosphate.

[0034] The preparation method of stearyl chloride modified rubber powder is as follows: 80-mesh rubber powder is treated with arc plasma at a DC voltage of 50 kV for 10 minutes to obtain activated rubber powder, then 400 g of the activated rubber powder is mixed with 120 g of stearyl chloride and 2800 g of xylene for reaction, and after the reaction is completed, the stearyl chloride modified rubber powder is obtained by filtering, washing and drying.

[0035] The preparation method of hydrolyzed polymaleic anhydride modified lignin is as follows: 12g of hydrolyzed polymaleic anhydride is dissolved in 180g of anhydrous ethanol solvent, the pH of the mixed solution is adjusted to 4, 120g of lignin is added, and the mixture is reacted at 60°C for 8h. After the reaction is completed, the product is taken out, washed, and dried to obtain modified lignin.

[0036] The preparation method of the above-mentioned road preventive maintenance coating material is: heating SBS modified asphalt to 100°C, then cooling it to maintain a fluid state, and sequentially adding furfural extracted oil, stearyl chloride modified rubber powder, hydrolyzed polymaleic anhydride modified lignin, quartz sand, basalt sand, corundum and phosphate coupling agent and stirring evenly to prepare the maintenance coating material.

[0037] Example 4

[0038] The road preventive maintenance coating material of this embodiment includes 200g of furfural extracted oil, 560g of SBS modified asphalt, 260g of stearyl chloride modified rubber powder, 160g of hydrolyzed polymaleic anhydride modified lignin, 400g of 80-mesh quartz sand, 400g of basalt sand, 200g of corundum, and 40g of tri(n-butyl) phosphate.

[0039] The preparation method of stearyl chloride modified rubber powder comprises the following steps: treating 150-mesh rubber powder with arc plasma at a DC voltage of 30 kV for 5 minutes to obtain activated rubber powder; then mixing 300 g of the activated rubber powder with 60 g of stearyl chloride and 1500 g of toluene for reaction; and after the reaction is completed, filtering, washing, and drying to obtain the stearyl chloride modified rubber powder.

[0040] The preparation method of hydrolyzed polymaleic anhydride modified lignin is as follows: 10g of hydrolyzed polymaleic anhydride is dissolved in 200g of isopropanol solvent, the pH of the mixed solution is adjusted to 6, 200g of lignin is added, and the mixture is reacted at 80°C for 6h. After the reaction is completed, the product is taken out, washed, and dried to obtain modified lignin.

[0041] The preparation method of the above-mentioned road preventive maintenance coating material is: heating SBS modified asphalt to 110°C, then cooling it to maintain a fluid state, and sequentially adding furfural extracted oil, stearyl chloride modified rubber powder, hydrolyzed polymaleic anhydride modified lignin, quartz sand, basalt sand, corundum and phosphate coupling agent and stirring evenly to prepare the maintenance coating material.

[0042] Example 5

[0043] The road preventive maintenance coating material of this embodiment includes 180g of furfural extracted oil, 400g of SBS modified asphalt, 160g of stearyl chloride modified rubber powder, 100g of hydrolyzed polymaleic anhydride modified lignin, 200g of 50-mesh quartz sand, 200g of basalt sand, 200g of corundum, and 10g of tri(n-butyl) phosphate.

[0044] The preparation method of stearyl chloride modified rubber powder comprises the following steps: treating 200-mesh rubber powder with arc plasma at a DC voltage of 35 kV for 8 minutes to obtain activated rubber powder; then mixing 180 g of the activated rubber powder with 48 g of stearyl chloride and 1100 g of toluene for reaction; and filtering, washing, and drying the mixture after completion of the reaction to obtain the stearyl chloride modified rubber powder.

[0045] The preparation method of hydrolyzed polymaleic anhydride modified lignin is as follows: 10g of hydrolyzed polymaleic anhydride is dissolved in 160g of anhydrous ethanol solvent, the pH of the mixed solution is adjusted to 6, 130g of lignin is added, and the mixture is reacted at 65°C for 7h. After the reaction is completed, the product is taken out, washed, and dried to obtain modified lignin.

[0046] The preparation method of the above-mentioned road preventive maintenance coating material is: heating SBS modified asphalt to 120°C, then cooling it to maintain a fluid state, and sequentially adding furfural extracted oil, stearyl chloride modified rubber powder, hydrolyzed polymaleic anhydride modified lignin, quartz sand, basalt sand, corundum and phosphate coupling agent and stirring evenly to prepare the maintenance coating material.

[0047] Example 6

[0048] The road preventive maintenance coating material of this embodiment includes 190g of furfural extracted oil, 600g of SBS modified asphalt, 240g of stearyl chloride modified rubber powder, 140g of hydrolyzed polymaleic anhydride modified lignin, 300g of 50-mesh quartz sand, 300g of basalt sand, 300g of corundum, and 20g of tri(n-butyl) phosphate.

[0049] The preparation method of stearyl chloride modified rubber powder comprises the following steps: treating 100-mesh rubber powder with arc plasma at a DC voltage of 50 kV for 8 minutes to obtain activated rubber powder; then mixing 270 g of the activated rubber powder with 45 g of stearyl chloride and 1200 g of toluene for reaction; and after the reaction is completed, filtering, washing, and drying to obtain the stearyl chloride modified rubber powder.

[0050] The preparation method of hydrolyzed polymaleic anhydride modified lignin is as follows: 10g of hydrolyzed polymaleic anhydride is dissolved in 160g of anhydrous ethanol solvent, the pH of the mixed solution is adjusted to 6, 200g of lignin is added, and the mixture is reacted at 70°C for 6.5h. After the reaction is completed, the product is taken out, washed, and dried to obtain modified lignin.

[0051] The preparation method of the above-mentioned road preventive maintenance coating material is: heating SBS modified asphalt to 110°C, then cooling it to maintain a fluid state, and sequentially adding furfural extracted oil, stearyl chloride modified rubber powder, hydrolyzed polymaleic anhydride modified lignin, quartz sand, basalt sand, corundum and phosphate coupling agent and stirring evenly to prepare the maintenance coating material.

[0052] Comparative Example 1

[0053] Comparative Example 1 is compared with Example 1, except that the stearyl chloride-modified rubber powder is not added, and the rest of the contents are the same as Example 1.

[0054] Comparative Example 2

[0055] Compared with Example 1, in Comparative Example 2, the rubber powder was added directly without modification, and the rest of the contents were the same as in Example 1.

[0056] Comparative Example 3

[0057] Comparative Example 3 Compared with Example 1, the rubber powder modified with stearyl chloride was directly modified without activation treatment, and the rest of the contents were the same as Example 1.

[0058] Comparative Example 4

[0059] Compared with Example 1, the amount of stearyl chloride modified rubber powder used in Comparative Example 4 exceeds the specified range, specifically 400 g. The rest of the contents are the same as in Example 1.

[0060] Comparative Example 5

[0061] Compared with Example 1, Comparative Example 5 lacks lignin, and the rest of the contents are the same as Example 1.

[0062] Comparative Example 6

[0063] Compared with Example 2, in Comparative Example 6, the amount of hydrolyzed polymaleic anhydride modified lignin exceeded the specified range, specifically 250 g. The rest of the contents were the same as in Example 2.

[0064] Comparative Example 7

[0065] Compared with Example 1, Comparative Example 7 lacks fine aggregate, and the rest of the contents are the same as Example 1.

[0066] The coating materials prepared in the above examples and comparative examples were poured into the spraying equipment and evenly sprayed on the road surface at a spraying rate of 1 kg / m2 , testing its wear resistance. The bond strength (MPa) refers to GB / T 16777-2008. The results are shown in the table below.

[0067] The coating materials prepared in the above examples and comparative examples were sprayed onto the surface of a rutting board (a standard AC-13 pavement with a measured dynamic stability of 3528) to form a 3 mm thin film. The coatings were cured at room temperature. Rutting resistance (higher dynamic stability indicates better rutting resistance) and abrasion resistance (higher abrasion values ​​indicate poorer abrasion resistance) were tested according to JTG E20-2011. Bond strength (MPa) was tested according to GB / T16777-2008.

[0068] Table 1 Performance of road preventive maintenance coating materials

[0069]

[0070] As shown in Table 1, compared with the examples, the coating material of the examples of the present invention has excellent wear resistance, rutting resistance and bonding strength. After the lignin is modified by hydrolysis of polymaleic anhydride, the comprehensive performance of the coating is improved.

[0071] In Comparative Example 1, when the stearyl chloride-modified rubber powder was omitted, the coating's abrasion resistance, rutting resistance, and bond strength all decreased significantly. Unmodified or unactivated rubber powder exhibited poor compatibility with other components, thus impacting the coating's final performance (Comparative Examples 2-3).

[0072] In Comparative Example 4, when the amount of stearoyl chloride-modified rubber powder is excessive, the particles tend to aggregate and form localized clusters, resulting in weak spots on the coating surface. These clusters easily peel off during friction, reducing wear resistance. When the amount of stearoyl chloride-modified rubber powder is excessive, the proportion of elastic particles is too high, resulting in insufficient rigidity in the coating, making it unable to effectively withstand the continuous compression of vehicle loads. This can easily lead to permanent deformation and poor rutting resistance. When the amount of stearoyl chloride-modified rubber powder is excessive, the substrate cannot fully wet the rubber powder surface, resulting in a reduction in interfacial bonding area and decreased bond strength.

[0073] In Comparative Examples 5 and 7, the lack of lignin and fine aggregate significantly reduced the overall performance of the coatings. In Comparative Example 6, the excessive amount of hydrolyzed polymaleic anhydride-modified lignin formed stress concentration points, causing agglomerates to flake off during friction and exacerbating wear. Excessive amounts also resulted in excessive coating stiffness and insufficient flexibility, making it unable to adapt to base deformation under vehicle loads, resulting in cracks and rutting.

[0074] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A road preventive maintenance coating material, characterized by: Calculated by weight, the coating material includes: 8-10 parts of furfural extracted oil, 20-30 parts of SBS modified asphalt, 8-15 parts of stearyl chloride modified rubber powder, 5-8 parts of lignin, 30-50 parts of fine aggregate, and 0.5-3 parts of phosphate coupling agent.

2. The road preventive maintenance coating material according to claim 1, characterized in that: The preparation method of the stearyl chloride modified rubber powder comprises the following steps: subjecting rubber powder to plasma treatment to obtain activated rubber powder, then mixing the activated rubber powder with stearyl chloride and an organic solvent for reaction, and filtering, washing, and drying the mixture after the reaction to obtain the stearyl chloride modified rubber powder.

3. A road preventive maintenance coating material according to claim 2, characterized in that: Plasma treatment is arc plasma treatment at a DC voltage of 30-50 kV for 5-10 minutes.

4. The road preventive maintenance coating material according to claim 2, characterized in that: The mass ratio of activated rubber powder: stearyl chloride: organic solvent is 20~50:4~10:100~200, and the organic solvent is one of toluene and xylene.

5. The road preventive maintenance coating material according to claim 1, characterized in that: The lignin is lignin modified by hydrolyzed polymaleic anhydride.

6. The road preventive maintenance coating material according to claim 5, characterized in that: The preparation method of the hydrolyzed polymaleic anhydride modified lignin is: The hydrolyzed polymaleic anhydride is dissolved in an alcohol solvent, the pH of the mixed solution is adjusted to 4-6, lignin is added, and the mixture is reacted at 60-80° C. for 6-8 hours. After the reaction is completed, the product is washed and dried to obtain modified lignin.

7. The road preventive maintenance coating material according to claim 6, characterized in that: The mass ratio of the hydrolyzed polymaleic anhydride to the lignin is 1:10-20, the mass ratio of the hydrolyzed polymaleic anhydride to the alcohol solvent is 1:15-20, and the alcohol solvent is ethanol or isopropanol.

8. The road preventive maintenance coating material according to claim 1, characterized in that: The fine aggregate is one or more of quartz sand, basalt sand, and corundum, with a particle size of 50-100 meshes; the particle size of the rubber powder is 80-200 meshes; and the phosphate coupling agent is one or more of triphenyl phosphate, tri(n-butyl) phosphate, and tri(ethyl) phosphate.

9. The method for preparing a road preventive maintenance coating material according to claim 6, wherein: The SBS modified asphalt is heated to 100-120° C., and furfural extracted oil, stearyl chloride modified rubber powder, hydrolyzed polymaleic anhydride modified lignin, fine aggregate and phosphate coupling agent are sequentially added and stirred evenly to obtain a curing coating material.

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