Permeable anti-rut agent and preparation method thereof

Abstract

The invention discloses a permeable anti-rut agent and a preparation method thereof. The anti-rut agent is prepared from 10 to 30 parts of modified asphalt, 30 to 50 parts of trans-polyisoprene, 10 to 20 parts of nano inorganic filler, 5 to 15 parts of plasticizer, 5 to 15 parts of fiber material, 1 to 5 parts of surfactant, 0.5 to 2 parts of anti-aging agent and 0.5 to 2 parts of silane coupling agent. The anti-rut agent can significantly improve the high-temperature stability of an asphalt pavement and reduce formation and development of ruts, microcracks and pores of the pavement can be repaired due to good permeability of the anti-rut agent, the tensile strength and shear resistance of the pavement are enhanced by the fiber material, the service life is prolonged by the anti-aging agent, and the strength of a composite material is improved by the silane coupling agent. The reasonable proportion of the TPI and the modified asphalt, the dispersion of the nano filler and the use of the silane coupling agent are key to performance improvement.

Description

Technical Field

[0001] The present invention relates to the field of road engineering materials, and particularly to a permeable rutting-resistant agent and a preparation method thereof. The rutting-resistant agent can be used to improve the rutting resistance of asphalt pavements and enhance the durability and service life of roads. Background Art

[0002] With the continuous increase in traffic volume and the increasing weight of vehicle axle loads, the rutting problem of asphalt pavements has become increasingly prominent. Rutting not only affects the smoothness and driving comfort of the road surface, but also reduces the structural strength and safety of the road surface. Although traditional rutting-resistant agents can improve the performance of asphalt pavements to a certain extent, they have problems such as poor compatibility with asphalt and insufficient permeability, and cannot effectively penetrate into the microcracks and pores of asphalt pavements, making it difficult to fully play their rutting-resistant role. Therefore, developing a rutting-resistant agent with good permeability and rutting resistance is of great significance for improving road quality.

[0003] Patent document CN201910206251.8 discloses a high-compressive rutting-resistant agent for asphalt roads. The shell powder is subjected to alkali immersion and ultrasonic dispersion to reduce its agglomeration and improve its surface activity, and then surface modification is carried out with a titanate coupling agent to increase the contact angle of its surface and improve its interaction effect with glue liquid, etc. During the oxidation treatment of cellulose acid solution, a compressed double electric layer can be generated in the system, which plays a role in toughening and strengthening, improving the internal mechanical properties and compressive effect. At the same time, the talc powder is pretreated with a polyvinyl alcohol solution and a surfactant to make the surface of the talc powder organic, and a composite auxiliary material is prepared with gelatin, gluten powder, etc., so that it has the functions of cationic and anionic exchange and excellent adsorption properties, and synergistically improves the compressive performance and mechanical properties after the rutting-resistant agent acts. However, this rutting-resistant agent performs poorly in terms of compressive performance and mechanical properties, and is prone to brittle fracture in low-temperature environments, affecting road safety.

[0004] Patent document CN201610049014.1 discloses a rutting-resistant agent for asphalt pavements and a preparation method thereof. By strengthening the interaction force between the prepared rutting-resistant agent and the ribbed asphalt mixture, the asphalt mixture becomes more compact, reducing the permeability of the formed road surface. At the same time, it increases the load-bearing capacity of the asphalt mixture, raises the softening point of the asphalt, reduces the temperature sensitivity, and increases the adhesion ability between the asphalt and the mineral aggregate. However, the cost of raw materials such as trans-polyisoprene, polymethyl methacrylate, and polymers in this rutting-resistant agent is relatively high, which may increase the overall production cost of the rutting-resistant agent and affect its economy.

[0005] Patent document CN201510015030.4 discloses an anti-rutting agent for asphalt pavement, which is made by mixing gutta-percha and polymer in weight parts of 10 - 100 parts and 0 - 90 parts respectively. Meanwhile, the anti-rutting agent for asphalt pavement in this solution has the characteristics of safe and convenient use and excellent anti-rutting effect, which can greatly improve the deformation of the asphalt pavement structural layer, improve the resilience of the asphalt pavement, increase its anti-rutting ability, and extend the service life of the asphalt pavement. However, the addition of gutta-percha in this method may affect its compatibility with asphalt, especially in different types or brands of asphalt, and problems of poor compatibility may occur. Summary of the Invention

[0006] In order to solve the above problems, the present invention provides a permeable anti-rutting agent, which comprises the following components in weight parts:

[0007] Modified asphalt: 15 - 30 parts;

[0008] Trans-polyisoprene: 30 - 50 parts;

[0009] Nano-inorganic filler: 10 - 20 parts;

[0010] Plasticizer: 5 - 15 parts;

[0011] Fiber material: 5 - 15 parts;

[0012] Surfactant: 1 - 5 parts;

[0013] Anti-aging agent: 0.5 - 2 parts;

[0014] Silane coupling agent: 0.5 - 2 parts.

[0015] Furthermore, the modified asphalt is one of SBS modified asphalt, SBR modified asphalt or EVA modified asphalt.

[0016] Furthermore, the nano-inorganic filler is nano-silica, nano-calcium carbonate or nano-montmorillonite. These materials have high specific surface area and high activity, which can enhance the strength and hardness of the anti-rutting agent, and at the same time fill the micro-pores of the asphalt pavement to enhance the structural stability of the pavement.

[0017] Further, it is one or more of the silane coupling agents γ-aminopropyltriethoxysilane, γ-aminopropyltrimethoxysilane, N-β-(aminoethyl)-γ-aminopropyltrimethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, γ-(2,3-epoxypropoxy)propyltrimethoxysilane, γ-mercaptopropyltrimethoxysilane, γ-mercaptopropyltriethoxysilane. The silane coupling agent molecule contains two different functional groups. One end of the functional group can chemically react with the trans-polyisoprene molecular chain, and the other end of the functional group can react with the hydroxyl groups on the surface of the inorganic filler (such as silica), thereby forming a bridge between the polymer and the filler, enhancing the interfacial bonding force between the two, and improving the strength and comprehensive performance of the composite material.

[0018] Further, the plasticizer is dioctyl phthalate (DOP) or dibutyl phthalate (DBP). These materials can improve the flexibility of the rutting-resistant agent, enable the rutting-resistant agent to disperse better in asphalt, and enhance the compatibility with asphalt.

[0019] Further, the fiber material is polyester fiber, polypropylene fiber or basalt fiber. These materials can effectively improve the tensile strength and shear resistance of the rutting-resistant agent, and prevent cracks and deformations from occurring on the asphalt pavement under the action of vehicle loads.

[0020] Further, the surfactant is sodium dodecyl sulfate or polyoxyethylene lauryl ether. These materials help to improve the permeability of the rutting-resistant agent, enable it to penetrate into the internal pores and microcracks of the asphalt pavement, reduce the interfacial tension between the rutting-resistant agent and asphalt, and promote the penetration of the rutting-resistant agent.

[0021] Further, the anti-aging agent is one or more of hindered amine anti-aging agents, hindered phenol antioxidants, and phosphite antioxidants. It can prevent the rutting-resistant agent from aging due to factors such as ultraviolet rays, oxygen, and temperature during use, and extend the service life of the rutting-resistant agent.

[0022] The present invention also provides a preparation method of the above-mentioned permeable rutting-resistant agent, including the following steps:

[0023] Step 1: Heat the modified asphalt to 160°C to 180°C, add trans-polyisoprene, and stir and mix evenly to obtain a mixture material A;

[0024] Step 2: Add the nano-inorganic filler, silane coupling agent and surfactant to an appropriate amount of dispersion medium, and ultrasonically disperse for 30 - 60 minutes to obtain a nano-filler dispersion liquid;

[0025] Step 3: Add the mixed material A, plasticizer, and anti-aging agent into a high-speed mixer, and stir at 120 - 180 °C for 20 - 30 minutes to make them fully and evenly mixed, obtaining the mixed material B;

[0026] Step 4: Slowly add the fiber material into the mixed material B, and continue stirring for 10 - 15 minutes to obtain the mixed material C;

[0027] Step 5: Slowly add the nano-filler dispersion into the mixed material C, stir at 150 - 200 °C for 30 - 45 minutes, and at the same time use a vacuum pump to evacuate to remove the dispersion medium, obtaining the permeable rutting-resistant agent.

[0028] Further, the dispersion medium is ethanol or acetone.

[0029] Advantages and beneficial effects of the present invention:

[0030] The permeable rutting-resistant agent of the present invention has excellent rutting resistance performance, can significantly improve the high-temperature stability of the asphalt pavement, reduce the formation and development of ruts. By adding trans-polyisoprene (TPI) and nano-inorganic fillers, the anti-deformation ability of the material is enhanced, especially showing excellent performance under high-temperature and heavy-load conditions. Due to the addition of surfactants, the rutting-resistant agent has good permeability, can penetrate deep into the interior of the asphalt pavement, fill and repair the micro-cracks and pores of the pavement, and fundamentally improve the structural integrity of the pavement. The fiber material in the rutting-resistant agent can enhance the tensile strength and shear resistance of the pavement, reduce the deformation and damage of the pavement under vehicle loads. The use of anti-aging agents can extend the service life of the rutting-resistant agent and the asphalt pavement, improve the durability of the road, and reduce the road maintenance cost. The silane coupling agent added contains two different functional groups in its molecule. One end of the functional group can chemically react with the trans-polyisoprene molecular chain, and the other end of the functional group can react with the hydroxyl groups on the surface of inorganic fillers (such as silica), thereby forming a bridge between the polymer and the filler, enhancing the interfacial bonding force between the two, and improving the strength and comprehensive performance of the composite material. By optimizing the formula and process, while ensuring high performance, the production cost of this rutting-resistant agent is reduced, and most of the raw materials selected are environmentally friendly materials, reducing environmental pollution. Specific embodiments

[0031] The following combines examples to further describe in detail the specific embodiments of the present invention. The following examples are used to illustrate the present invention, but do not limit the scope of the present invention.

[0032] It should be understood that when used in this specification and the appended claims, the term "comprising" indicates the presence of described features, integers, steps, operations, elements, and / or components, but does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0033] As used herein, "a" not only means "only one", but may also mean "more than one" situation.

[0034] It should be further understood that the term "and / or" used in the description of this application and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0035] In the illustrated embodiments, the indication of directions (such as up, down, left, right, front, and back) is used to explain that the structures and movements of the various components of the present invention are not absolute but relative. If the description of the positions of these components changes, then the indication of these directions also changes accordingly.

[0036] In addition, in the description of this application, the terms "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0037] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will be compared with the specific embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other embodiments can be obtained.

[0038] Embodiment 1

[0039] Step 1: Heat 20 parts of SBS modified asphalt to 170 °C, add 35 parts of trans-polyisoprene, and stir and mix evenly to obtain a mixture material A;

[0040] Step 2: Add 15 parts of nano-silica, 1 part of γ-aminopropyltriethoxysilane, and 3 parts of sodium dodecyl sulfate to an appropriate amount of ethanol, and ultrasonically disperse for 30 minutes to obtain a nano-filler dispersion;

[0041] Step 3: Add the mixed material A, 12 parts of dioctyl phthalate, and 1 part of a hindered amine antioxidant to a high-speed mixer, and stir at 150 °C for 20 minutes to make them fully mixed evenly to obtain a mixed material B;

[0042] Step 4: Slowly add 13 parts of polyester fiber material to the mixed material B, and continue to stir for 10 minutes to obtain a mixed material C;

[0043] Step 5: Slowly add the nano-filler dispersion into the mixed material C, stir for 30 minutes at 200°C, and at the same time use a vacuum pump to evacuate to remove ethanol, obtaining a permeable rutting-resistant agent.

[0044] Example 2

[0045] Step 1: Heat 25 parts of SBS modified asphalt to 170°C, add 30 parts of trans-polyisoprene, and stir and mix evenly to obtain the mixed material A;

[0046] Step 2: Add 15 parts of nano-silica, 1 part of γ-aminopropyltriethoxysilane, and 3 parts of sodium dodecyl sulfate into an appropriate amount of ethanol, and ultrasonically disperse for 30 minutes to obtain the nano-filler dispersion;

[0047] Step 3: Add the mixed material A, 12 parts of dioctyl phthalate, and 1 part of hindered amine antioxidant into a high-speed mixer, stir at 150°C for 20 minutes to make them fully mixed evenly, obtaining the mixed material B;

[0048] Step 4: Slowly add 13 parts of polyester fiber material into the mixed material B, and continue to stir for 10 minutes to obtain the mixed material C;

[0049] Step 5: Slowly add the nano-filler dispersion into the mixed material C, stir for 30 minutes at 200°C, and at the same time use a vacuum pump to evacuate to remove ethanol, obtaining a permeable rutting-resistant agent.

[0050] Example 3

[0051] Step 1: Heat 15 parts of SBS modified asphalt to 170°C, add 40 parts of trans-polyisoprene, and stir and mix evenly to obtain the mixed material A;

[0052] Step 2: Add 15 parts of nano-silica, 1 part of γ-aminopropyltriethoxysilane, and 3 parts of sodium dodecyl sulfate into an appropriate amount of ethanol, and ultrasonically disperse for 30 minutes to obtain the nano-filler dispersion;

[0053] Step 3: Add the mixed material A, 12 parts of dioctyl phthalate, and 1 part of hindered amine antioxidant into a high-speed mixer, stir at 150°C for 20 minutes to make them fully mixed evenly, obtaining the mixed material B;

[0054] Step 4: Slowly add 13 parts of polyester fiber material into the mixed material B, and continue to stir for 10 minutes to obtain the mixed material C;

[0055] Step 5: Slowly add the nano-filler dispersion into the mixed material C, stir for 30 minutes at 200°C, and at the same time use a vacuum pump to evacuate to remove ethanol, obtaining a permeable rutting-resistant agent.

[0056] Comparative Example 1

[0057] Step 1: Heat 20 parts of SBS modified asphalt to 170 °C, add 35 parts of trans-polyisoprene, and stir and mix evenly to obtain mixture material A;

[0058] Step 2: Add 15 parts of nano-silica and 3 parts of sodium dodecyl sulfate to an appropriate amount of ethanol, and ultrasonically disperse for 30 minutes to obtain a nano-filler dispersion;

[0059] Step 3: Add mixture material A, 12 parts of dioctyl phthalate, and 1 part of hindered amine antioxidant to a high-speed mixer, and stir at 150 °C for 20 minutes to make them fully mixed evenly to obtain mixture material B;

[0060] Step 4: Slowly add 13 parts of polyester fiber material to mixture material B, and continue to stir for 10 minutes to obtain mixture material C;

[0061] Step 5: Slowly add the nano-filler dispersion to mixture material C, stir at 200 °C for 30 minutes, and at the same time use a vacuum pump to evacuate to remove ethanol to obtain a permeable rutting-resistant agent.

[0062] Comparative Example 2

[0063] Step 1: Heat 20 parts of SBS modified asphalt to 170 °C to obtain mixture material A;

[0064] Step 2: Add 15 parts of nano-silica, 1 part of γ-aminopropyltriethoxysilane, and 3 parts of sodium dodecyl sulfate to an appropriate amount of ethanol, and ultrasonically disperse for 30 minutes to obtain a nano-filler dispersion;

[0065] Step 3: Add mixture material A, 12 parts of dioctyl phthalate, and 1 part of hindered amine antioxidant to a high-speed mixer, and stir at 150 °C for 20 minutes to make them fully mixed evenly to obtain mixture material B;

[0066] Step 4: Slowly add 13 parts of polyester fiber material to mixture material B, and continue to stir for 10 minutes to obtain mixture material C;

[0067] Step 5: Slowly add the nano-filler dispersion to mixture material C, stir at 200 °C for 30 minutes, and at the same time use a vacuum pump to evacuate to remove ethanol to obtain a permeable rutting-resistant agent.

[0068] Comparative Example 3

[0069] Step 1: Heat 10 parts of SBS modified asphalt to 170 °C, add 45 parts of trans-polyisoprene, and stir and mix evenly to obtain mixture material A;

[0070] Step 2: Add 15 parts of nano-silica, 1 part of γ-aminopropyltriethoxysilane, and 3 parts of sodium dodecyl sulfate into an appropriate amount of ethanol, and ultrasonically disperse for 30 minutes to obtain a nano-filler dispersion.

[0071] Step 3: Add the mixed material A, 12 parts of dioctyl phthalate, and 1 part of hindered amine antioxidant into a high-speed mixer, and stir at 150 °C for 20 minutes to make them fully and evenly mixed to obtain a mixed material B.

[0072] Step 4: Slowly add 13 parts of polyester fiber material into the mixed material B, and continue to stir for 10 minutes to obtain a mixed material C.

[0073] Step 5: Slowly add the nano-filler dispersion into the mixed material C, stir at 200 °C for 30 minutes, and at the same time use a vacuum pump to evacuate to remove ethanol to obtain a permeable rutting-resistant agent.

[0074] Comparative Example 4

[0075] Step 1: Heat 35 parts of SBS modified asphalt to 170 °C, add 20 parts of trans-polyisoprene, and stir and mix evenly to obtain a mixture material A.

[0076] Step 2: Add 15 parts of nano-silica, 1 part of γ-aminopropyltriethoxysilane, and 3 parts of sodium dodecyl sulfate into an appropriate amount of ethanol, and ultrasonically disperse for 30 minutes to obtain a nano-filler dispersion.

[0077] Step 3: Add the mixed material A, 12 parts of dioctyl phthalate, and 1 part of hindered amine antioxidant into a high-speed mixer, and stir at 150 °C for 20 minutes to make them fully and evenly mixed to obtain a mixed material B.

[0078] Step 4: Slowly add 13 parts of polyester fiber material into the mixed material B, and continue to stir for 10 minutes to obtain a mixed material C.

[0079] Step 5: Slowly add the nano-filler dispersion into the mixed material C, stir at 200 °C for 30 minutes, and at the same time use a vacuum pump to evacuate to remove ethanol to obtain a permeable rutting-resistant agent.

[0080] Obtain the anti-fatigue test, dynamic stability, Marshall stability, and freeze-thaw splitting strength ratio of the rutting-resistant agents in the examples and comparative examples through standard test methods (such as JTJE20 - 2011 or ASTM standards), and the results are shown in the following table:

[0081]

[0082] Examples 1-3 significantly improved the fatigue resistance, dynamic stability, and weather resistance by optimizing the ratio of TPI to modified asphalt (20-40 parts) and adding nano-fillers and silane coupling agents. From Comparative Example 1, it can be seen that without using the silane coupling agent, the performance decreased significantly. It can be seen that the silane coupling agent molecule added contains two different functional groups. One end of the functional group can chemically react with the trans-polyisoprene molecular chain, and the other end of the functional group can react with the hydroxyl groups on the surface of the inorganic filler (such as silica), thus forming a bridge between the polymer and the filler, enhancing the interfacial bonding force between the two, and improving the strength and comprehensive performance of the composite material. From Comparative Example 2, it can be seen that without adding TPI, the elasticity and fatigue resistance of the material decreased significantly. From Comparative Example 3, it can be seen that when the TPI ratio is too high (45 parts) and the modified asphalt ratio is too low (10 parts), the modified asphalt ratio is too low, resulting in a decrease in the adhesiveness and stability of the material. From Comparative Example 4, it can be seen that when the modified asphalt ratio is too high (35 parts) and the TPI ratio is too low (20 parts), the elasticity and rutting resistance of the material are insufficient. Generally speaking, the reasonable ratio of TPI to modified asphalt, the uniform dispersion of nano-fillers, and the use of silane coupling agents are the keys to improving performance.

[0083] Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the above examples, those of ordinary skill in the art should understand that: still can modify the specific implementation manners of the present invention or make equivalent substitutions, and any modification or equivalent substitution without departing from the spirit and scope of the present invention shall be covered by the protection scope of the claims of the present invention.

Claims

1. A penetrating anti-rutting agent, characterized in that: The composition comprises the following components in parts by weight: Modified asphalt: 15-30 parts; Trans-polyisoprene: 30-50 parts; Nano inorganic filler: 10-20 parts; Plasticizer: 5-15 parts; Fiber material: 5-15 parts; Surfactant: 1-5 parts; Anti-aging agent: 0.5-2 parts; Silane coupling agent: 0.5-2 parts.

2. The penetrating anti-rutting agent according to claim 1, characterized in that: The modified asphalt is one of SBS modified asphalt, SBR modified asphalt or EVA modified asphalt.

3. The penetrating anti-rutting agent according to claim 1, characterized in that: The nano inorganic filler is nano silicon dioxide, nano calcium carbonate or nano montmorillonite.

4. The penetrating anti-rutting agent according to claim 1, characterized in that: The silane coupling agent is one or more of γ-aminopropyltriethoxysilane, γ-aminopropyltrimethoxysilane, N-β-(aminoethyl)-γ-aminopropyltrimethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, γ-(2,3-epoxypropoxy)propyltrimethoxysilane, γ-mercaptopropyltrimethoxysilane and γ-mercaptopropyltriethoxysilane.

5. The penetrating anti-rutting agent according to claim 1, characterized in that: The plasticizer is dioctyl phthalate (DOP) or dibutyl phthalate (DBP).

6. The penetrating anti-rutting agent according to claim 1, characterized in that: The fiber material is polyester fiber, polypropylene fiber or basalt fiber.

7. The penetrating anti-rutting agent according to claim 1, characterized in that: The surfactant is sodium lauryl sulfate or polyoxyethylene lauryl ether.

8. The penetrating anti-rutting agent according to claim 1, characterized in that: The antioxidant is one or more of a hindered amine antioxidant, a hindered phenol antioxidant, and a phosphite antioxidant.

9. A method for preparing the permeable anti-rutting agent as claimed in claims 1 to 8, characterized in that: The following steps are involved: Step 1: heat the modified asphalt to 160° C. to 180° C., add trans-polyisoprene, and stir to mix evenly to obtain a mixture material A; Step 2: Add the nano inorganic filler, silane coupling agent and surfactant into a proper amount of dispersion medium, and disperse them by ultrasonic for 30-60 minutes to obtain a nano filler dispersion; Step 3, adding the mixed material A, the plasticizer and the anti-aging agent into a high-speed mixer, stirring at 120-180° C. for 20-30 minutes to fully mix them, and obtaining a mixed material B; Step 4: slowly add the fiber material into the mixture B, and continue stirring for 10-15 minutes to obtain the mixture C; Step 5: slowly add the nanofiller dispersion into the mixed material C, stir at 150-200° C. for 30-45 minutes, and use a vacuum pump to evacuate the mixture to remove the dispersion medium, thereby obtaining a permeable anti-rutting agent.

10. The preparation method according to claim 9, characterized in that: The dispersion medium is ethanol or acetone.

Images