A direct high-viscosity high-elasticity asphalt modifier and a preparation method and application method thereof

Abstract

The application discloses a kind of direct injection high viscidity high elasticity asphalt modifier, preparation method and application method, belong to road engineering material and asphalt modification technical field.The modifier includes the following raw materials by weight fraction:6~9 parts of SBS, 5~8 parts of waste rubber powder, 6~9 parts of naphthenic rubber oil, 3~6 parts of petroleum resin and 1~4 parts of warm mixing agent.Silane coupling agent is used to carry out surface activation treatment to waste rubber powder first, then all raw materials are prepared modifier by twin-screw extruder melt blending extrusion process.The modifier can be directly put into hot aggregate for dry mixing, realize the rapid melting dispersion of modifier in asphalt, avoid the segregation and performance attenuation of traditional wet modified asphalt in storage and transportation process, and at the same time, reduce the construction temperature of asphalt mixture.

Description

Technical Field

[0001] This invention relates to the field of road engineering materials and asphalt modification technology, specifically to a direct-injection high-viscosity and high-elasticity asphalt modifier and its preparation and application methods. Background Technology

[0002] High-viscosity, high-elasticity modifiers can effectively improve the high-temperature stability, low-temperature crack resistance, and elastic recovery performance of asphalt, and are widely used in high-grade roads, bridge deck paving, and drainage pavements. However, since high-viscosity, high-elasticity modifiers and petroleum asphalt are thermodynamically incompatible systems, modified asphalt usually needs to be prepared through high-speed shearing and long-term development processes before it can be used to mix and produce asphalt mixtures. This process is complex and time-consuming. Moreover, the prepared high-viscosity, high-elasticity modified asphalt is prone to segregation and degradation during storage and transportation, leading to a decline in the performance of the modified asphalt.

[0003] To address the aforementioned issues, this invention proposes a direct-injection high-viscosity, high-elasticity asphalt modifier. This modifier can be added directly to the mixing pot during the asphalt mixture mixing process. The modifier can quickly melt and disperse into the asphalt, thereby modifying the asphalt. The construction process is simple and efficient. Summary of the Invention

[0004] This invention provides a direct-injection high-viscosity and high-elasticity asphalt modifier, its preparation method, and its application method, in order to solve the problems of complex production process, easy segregation during storage and transportation, and insufficient dispersion uniformity of existing direct-injection modifiers in the prior art for wet-process high-viscosity and high-elasticity modified asphalt.

[0005] In one aspect, a direct-injection high-viscosity and high-elasticity asphalt modifier is provided, comprising the following raw materials in parts by weight: 6-9 parts SBS, 5-8 parts waste rubber powder, 6-9 parts naphthenic rubber oil, 3-6 parts petroleum resin, 1-4 parts warm mix agent, and 0.3-0.8 parts antioxidant.

[0006] Secondly, a method for preparing a direct-injection high-viscosity, high-elasticity asphalt modifier is provided, comprising:

[0007] Weigh out the following raw materials in parts by weight: 6-9 parts SBS, 5-8 parts waste rubber powder, 6-9 parts naphthenic rubber oil, 3-6 parts petroleum resin, and 1-4 parts warm mix agent;

[0008] The waste adhesive powder is subjected to surface activation treatment;

[0009] The SBS and naphthenic rubber oil are added to a disperser in a specific ratio and stirred at 200-250 rpm for 12-15 minutes at room temperature until a cotton-like consistency is achieved. Then, the surface-activated waste rubber powder is added, and dispersion continues for 10-12 minutes at the same speed. Finally, the petroleum resin, the warm mix agent, and optional other additives (such as antioxidants) are added, and the mixture is stirred for another 16-18 minutes to obtain a premix. The antioxidant is preferably antioxidant 168, and its dosage is 0.3%-0.8% of the total mass of the modifier raw materials.

[0010] The mixture is added to a twin-screw extruder and melt-blended extruded at 160–190°C.

[0011] The extruded strips are cooled and granulated to obtain a direct-injection high-viscosity and high-elasticity asphalt modifier.

[0012] The surface activation treatment of the waste adhesive powder includes:

[0013] Prepare a hydrolysis solution by mass ratio m(silane coupling agent):m(water):m(ethanol) = 1:1:20, and let it stand for 2 hours to hydrolyze.

[0014] The hydrolysis solution was sprayed onto the surface of the waste rubber powder at a ratio of m (solution):m (waste rubber powder) = 11:50, and then placed in a disperser and stirred for 1 hour.

[0015] The treated waste rubber powder was dried in an oven at 105℃.

[0016] Thirdly, a method for applying a direct-injection high-viscosity, high-elasticity asphalt modifier is provided, including:

[0017] After heating the aggregate to the mixing temperature, add the direct-injection high-viscosity and high-elasticity asphalt modifier and dry mix to allow the modifier to initially melt and disperse on the surface of the hot aggregate.

[0018] Add base asphalt to the dry-mixed aggregate and wet-mix it to further melt and uniformly disperse the direct-injection high-viscosity and high-elasticity asphalt modifier in the asphalt system, and obtain a high-viscosity and high-elasticity asphalt mixture.

[0019] The direct-injection high-viscosity and high-elasticity asphalt modifier comprises the following raw materials in parts by weight: 6-9 parts SBS, 5-8 parts waste rubber powder, 6-9 parts naphthenic rubber oil, 3-6 parts petroleum resin, and 1-4 parts warm mix agent.

[0020] Preferably, the direct-injection high-viscosity and high-elasticity asphalt modifier is dry-mixed with hot mineral aggregate for 120-150 seconds.

[0021] Preferably, the dosage of the direct-injection high-viscosity and high-elasticity asphalt modifier is 8% to 12% of the mass of the base asphalt.

[0022] Preferably, the base asphalt is 70# road petroleum asphalt.

[0023] Thus, the direct-injection high-viscosity, high-elasticity asphalt modifier of this invention is prepared through a twin-screw melt blending process and surface activation treatment with waste rubber powder, which improves the dispersion uniformity of the modifier. The direct-injection high-viscosity, high-elasticity asphalt modifier can be directly added to thermal aggregates for dry mixing, avoiding the segregation problem that occurs during storage and transportation of traditional wet-process modified asphalt. Attached Figure Description To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a flowchart of the preparation method of the direct-injection asphalt modifier according to an embodiment of the present invention;

[0025] Figure 2 This is a flowchart of the application method of the direct-injection asphalt modifier according to an embodiment of the present invention. Detailed Implementation

[0026] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to them. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are all within the scope of protection of the present invention.

[0027] This invention discloses a direct-injection high-viscosity, high-elasticity asphalt modifier. The direct-injection high-viscosity, high-elasticity asphalt modifier comprises the following raw materials in parts by weight: 6-9 parts SBS, 5-8 parts waste rubber powder, 6-9 parts naphthenic rubber oil, 3-6 parts petroleum resin, 1-4 parts warm-mix agent, and 0.3-0.8 parts antioxidant.

[0028] Preferably, the SBS is a linear styrene-butadiene-styrene block copolymer. SBS can form an elastic network structure in the asphalt system, improving the high-temperature stability and elastic recovery performance of the asphalt.

[0029] Preferably, the waste rubber powder is 60-mesh waste tire rubber powder. Waste rubber powder can improve the viscoelastic properties of the asphalt system and enhance its resistance to deformation at high temperatures.

[0030] Preferably, the waste rubber powder is surface activated using a silane coupling agent to improve the compatibility between the waste rubber powder and the asphalt system and to enhance the uniformity of the dispersion of the internal components of the modifier.

[0031] Preferably, the waste rubber powder is surface-activated using a silane coupling agent. The silanol groups formed after the hydrolysis of the silane coupling agent can interact with the active groups on the surface of the waste rubber powder, forming an organosilane layer. This reduces the surface polarity difference of the waste rubber powder particles, weakens particle agglomeration, and improves the wetting and dispersing ability of the waste rubber powder in naphthenic rubber oil and asphalt systems. Simultaneously, the improved interfacial bonding between the surface-activated waste rubber powder and SBS and asphalt components facilitates uniform dispersion of the waste rubber powder in the modifier system during twin-screw melt blending.

[0032] Preferably, the petroleum resin has a high softening point and strong tackifying effect, which can improve the bonding ability between the components in the modifier system. The petroleum resin, together with SBS and the rubber phase swollen from waste rubber powder, can increase the viscosity of the continuous phase within the system, enhance the stability of the elastic network structure in the modifier system, thereby reducing the system's fluidity under high-temperature conditions and improving the high-temperature stability of the modified asphalt. Simultaneously, the petroleum resin can improve the adhesion between asphalt and aggregates, enhancing the interfacial bonding performance of the asphalt mixture.

[0033] Preferably, the warm mix agent is a long-chain aliphatic hydrocarbon organic warm mix material, which can melt and disperse in the asphalt system at temperatures above its melting point, reducing the internal friction of the asphalt system, thereby reducing the viscosity of the modified asphalt during mixing and construction, improving the fluidity and coating capacity of the asphalt mixture, and enabling the modified asphalt to be mixed and compacted at lower temperatures. Simultaneously, the warm mix agent can form a crystalline structure after the temperature decreases, which plays a certain stabilizing role in the high-temperature performance of the modified asphalt.

[0034] Preferably, SBS and naphthenic rubber oil form a swelling system, and waste rubber powder and petroleum resin form a thickening system. By compounding the components, the high viscosity, high elasticity, and melt dispersion properties of the modifier are improved.

[0035] Furthermore, this invention also discloses a method for preparing a direct-application high-viscosity, high-elasticity asphalt modifier. The preparation method includes the following steps:

[0036] Step S101: Weigh the raw materials including the following parts by weight: 6-9 parts SBS, 5-8 parts waste rubber powder, 6-9 parts naphthenic rubber oil, 3-6 parts petroleum resin, and 1-4 parts warm mix agent.

[0037] Step S102: Surface activation treatment of waste adhesive powder.

[0038] Specifically, a hydrolysis solution was prepared by mass ratio m (silane coupling agent): m (water): m (ethanol) = 1:1:20, and allowed to stand for 2 hours for hydrolysis.

[0039] Subsequently, the hydrolysis solution was sprayed onto the surface of the waste rubber powder at a ratio of m (solution):m (waste rubber powder) = 11:50, and then placed in a disperser and stirred for 1 hour.

[0040] Finally, the treated waste rubber powder was dried in an oven at 105℃ to obtain activated waste rubber powder.

[0041] Step S103: Premix SBS, activated waste rubber powder, naphthenic rubber oil, petroleum resin, warm mix agent and antioxidant to obtain a modifier premix.

[0042] Step S104: The modifier premix is ​​added to a twin-screw extruder and melt-blended extruded at 160–190°C. The antioxidant is preferably antioxidant 168, and its dosage is 0.3%–0.8% of the total mass of the modifier raw materials.

[0043] Preferably, the extrusion temperature of the twin-screw extruder is 180–190°C.

[0044] The twin-screw melt blending process can improve the dispersion uniformity between components and promote the uniform distribution of SBS and waste rubber powder in the system.

[0045] Step S105: Cool and granulate the extruded strip to obtain a direct-injection high-viscosity and high-elasticity asphalt modifier.

[0046] Furthermore, this invention also discloses a method for applying a direct-injection high-viscosity, high-elasticity asphalt modifier. This application method includes the following steps:

[0047] Step S201: Heat the aggregate to a mixing temperature of 170-190℃.

[0048] Step S202: Add direct-injection high-viscosity and high-elasticity asphalt modifier to the heated aggregate and dry mix it to allow the modifier to initially melt and disperse on the surface of the hot aggregate.

[0049] Preferably, the dry mixing time is 120-150 seconds to improve the melting and dispersion effect of the modifier in the hot mineral material.

[0050] Step S203: Add base asphalt to the dry-mixed aggregate and perform wet mixing to further melt the modifier and disperse it evenly in the asphalt system.

[0051] Preferably, the base asphalt temperature is 160–170°C; the dosage of the direct-injection high-viscosity and high-elasticity asphalt modifier is 8%–12% of the base asphalt mass.

[0052] Step S204: Obtain high-viscosity and high-elasticity asphalt mixture.

[0053] Example 1

[0054] A hydrolysis solution was prepared at a mass ratio of m(silane coupling agent):m(water):m(ethanol) = 1:1:20 and allowed to stand for hydrolysis for 2 hours. The hydrolysis solution was sprayed onto the surface of 5 parts by weight of 60-mesh waste rubber powder at a ratio of m(solution):m(waste rubber powder) = 11:50 and stirred in a disperser for 1 hour. Finally, the treated waste rubber powder was dried in an oven at 105℃ to obtain activated waste rubber powder. 6 parts by weight of SBS, the activated waste rubber powder, 6 parts by weight of naphthenic rubber oil, 3 parts by weight of petroleum resin, 1 part by weight of warm mix agent, and 0.5 parts by weight of antioxidant 168 were mixed to obtain a modifier premix. The modifier premix was added to a twin-screw extruder and melt-blended at 180℃. The extruded strip was then cooled and granulated to obtain a direct-acting high-viscosity, high-elasticity asphalt modifier.

[0055] Example 2

[0056] A hydrolysis solution was prepared at a mass ratio of m(silane coupling agent):m(water):m(ethanol) = 1:1:20 and allowed to stand for 2 hours for hydrolysis. The hydrolysis solution was sprayed onto the surface of 6 parts by weight of 60-mesh waste rubber powder at a ratio of m(solution):m(waste rubber powder) = 11:50 and stirred in a disperser for 1 hour. Finally, the treated waste rubber powder was dried in an oven at 105℃ to obtain activated waste rubber powder. 7 parts by weight of SBS, the activated waste rubber powder, 7 parts by weight of naphthenic rubber oil, 4 parts by weight of petroleum resin, 2 parts by weight of warm mix agent, and 0.5 parts by weight of antioxidant 168 were mixed and premixed to obtain a modifier premix. The modifier premix was added to a twin-screw extruder and melt-blended at 185℃. The extruded strip was then cooled and granulated to obtain a direct-injection high-viscosity, high-elasticity asphalt modifier.

[0057] Example 3

[0058] A hydrolysis solution was prepared by mass ratio m(silane coupling agent):m(water):m(ethanol) = 1:1:20 and allowed to stand for hydrolysis for 2 hours. The hydrolysis solution was sprayed onto the surface of 8 parts by weight of 60-mesh waste rubber powder at a ratio of m(solution):m(waste rubber powder) = 11:50 and stirred in a disperser for 1 hour. Finally, the treated waste rubber powder was dried in an oven at 105℃ to obtain activated waste rubber powder. 9 parts by weight of SBS, the activated waste rubber powder, 9 parts by weight of naphthenic rubber oil, 6 parts by weight of petroleum resin, 4 parts by weight of warm mix agent, and 0.5 parts by weight of antioxidant 168 were mixed and premixed to obtain a modifier premix. The modifier premix was added to a twin-screw extruder and melt-blended at 190℃. The extruded strip was then cooled and granulated to obtain a direct-acting high-viscosity, high-elasticity asphalt modifier.

[0059] The specific application method is as follows: dry mix the heated aggregate with the direct-injection high-viscosity and high-elasticity asphalt modifier for 120 to 150 seconds, then add the base asphalt and wet mix to obtain a high-viscosity and high-elasticity asphalt mixture, wherein the dosage of the direct-injection high-viscosity and high-elasticity asphalt modifier is 8% to 12% of the mass of the base asphalt.

[0060] The test results show that the direct-injection high-viscosity and high-elasticity asphalt modifier prepared using the embodiments of the present invention can achieve rapid melting and dispersion in a short mixing time, and improve the high-temperature stability, low-temperature crack resistance and elastic recovery performance of the modified asphalt.

[0061] The above description is merely a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A direct-application high-viscosity, high-elasticity asphalt modifier, characterized in that, It includes the following raw materials in parts by weight: 6-9 parts, waste rubber powder 5-8 parts, naphthenic rubber oil 6-9 parts, petroleum resin 3-6 parts, warm mix agent 1-4 parts, and antioxidant 0.3-0.8 parts.

2. The direct-application high-viscosity, high-elasticity asphalt modifier according to claim 1, characterized in that, The SBS is a linear styrene-butadiene-styrene block copolymer.

3. The direct-application high-viscosity, high-elasticity asphalt modifier according to claim 1, characterized in that, The waste rubber powder is 60-mesh waste tire rubber powder.

4. The direct-application high-viscosity, high-elasticity asphalt modifier according to claim 1, characterized in that, The waste adhesive powder is pre-treated with a silane coupling agent for surface activation.

5. The direct-application high-viscosity, high-elasticity asphalt modifier according to claim 1, characterized in that, The antioxidant is antioxidant 168.

6. The direct-application high-viscosity, high-elasticity asphalt modifier according to claim 4, characterized in that, The surface activation treatment of the waste adhesive powder includes the following steps: Step 1: Prepare a silane coupling agent hydrolysis solution by mass ratio m(silane coupling agent):m(water):m(ethanol) = 1:1:20, and let it stand for 2 hours to hydrolyze. Step 2: Spray the silane coupling agent hydrolysis solution onto the surface of the waste rubber powder at a ratio of m (silane coupling agent hydrolysis solution): m (waste rubber powder) = 11:50, and place it in a disperser and stir for 1 hour; Step 3: Dry the treated waste rubber powder at 105℃.

7. The direct-application high-viscosity, high-elasticity asphalt modifier according to claim 1, characterized in that, The naphthenic rubber oil is KN4010 naphthenic rubber oil.

8. The direct-application high-viscosity, high-elasticity asphalt modifier according to claim 1, characterized in that, The SBS is compounded with naphthenic rubber oil to form a swelling system, and the waste rubber powder is compounded with petroleum resin to form a thickening system.

9. A method for preparing a direct-application high-viscosity, high-elasticity asphalt modifier, characterized in that, include: Step 1: Weigh the raw materials in the following parts by weight: 6-9 parts SBS, 5-8 parts waste rubber powder, 6-9 parts naphthenic rubber oil, 3-6 parts petroleum resin, and 1-4 parts warm mix agent. Step 2: The waste adhesive powder is surface activated using a silane coupling agent hydrolysis solution; Step 3: Premix the SBS, waste rubber powder, naphthenic rubber oil, petroleum resin and warm mix agent; Step 4: Add the raw material mixture into a twin-screw extruder and perform melt blending extrusion at 160-190°C; Step 5: Cool and granulate the extruded strips to obtain a direct-injection high-viscosity and high-elasticity asphalt modifier.

10. The method for preparing the direct-application high-viscosity, high-elasticity asphalt modifier according to claim 9, characterized in that, The extrusion temperature of the twin-screw extruder is 180–190°C.

11. A method for applying a direct-application high-viscosity, high-elasticity asphalt modifier, characterized in that, include: After heating the aggregate to 170-190℃, add the direct-injection high-viscosity and high-elasticity asphalt modifier and dry mix. Base asphalt is added to the dry-mixed aggregate and wet-mixed to obtain a high-viscosity, high-elasticity asphalt mixture. The direct-mix high-viscosity, high-elasticity asphalt modifier comprises the following raw materials in parts by weight: 6-9 parts SBS, 5-8 parts waste rubber powder, 6-9 parts naphthenic rubber oil, 3-6 parts petroleum resin, and 1-4 parts warm-mix agent.

12. The application method of the direct-application high-viscosity, high-elasticity asphalt modifier according to claim 11, characterized in that, The direct-injection high-viscosity and high-elasticity asphalt modifier is dry-mixed with the hot aggregate for 120-150 seconds before being added to the base asphalt.

13. The application method of the direct-application high-viscosity, high-elasticity asphalt modifier according to claim 11, characterized in that, The dosage of the direct-injection high-viscosity and high-elasticity asphalt modifier is 8% to 12% of the mass of the base asphalt.

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