Cement stabilized macadam aggregate interface damping enhanced coating material applicable to severe cold environment

Abstract

The invention discloses a cement stabilized macadam aggregate interface damping enhanced coating material suitable for a severe cold environment. The coating is prepared from the following components in parts by weight: 30 to 40 parts of trimethoxysilane methacrylate, 20 to 30 parts of tung oil modified epoxy resin, 10 to 18 parts of nano metakaolin, 1.5 to 3 parts of cobalt / calcium isooctoate composite catalyst, 3 to 7 parts of phosphate modified graphene, 2 to 5 parts of fumed silica and 0.3 to 0.5 part of sodium dodecyl benzene sulfonate. The problems that an existing national road generally adopts a thick cement stabilized macadam semi-rigid base layer and thin asphalt surface layer structure, vehicle vibration is coupled with a pavement structure under the action of heavy-duty trucks, degradation, breakage and fragmentation of the semi-rigid base layer are accelerated, and a series of secondary diseases occur are effectively solved.

Description

Technical Field

[0001] The present invention relates to the technical field of damping enhancement materials for cement stabilized macadam, and particularly to a damping enhancement coating material for the interface of cement stabilized macadam aggregate applicable to severe cold environments. Background Technique

[0002] After being solidified, cement stabilized macadam can form a hard structural system, which can bear greater loads and significantly improve the bearing capacity of roads. After cement solidification, the material has strong durability. Even after experiencing multiple heavy loads and repeated disturbances, its strength will not decrease significantly. Pure crushed stone materials are easily eroded by water, resulting in a decrease in strength. However, after cement stabilization, the resistance to water corrosion is improved. Cement stabilized macadam can be mixed at the construction site, saving transportation time and costs, and can also flexibly adapt to different engineering construction needs. Damping enhancement materials can significantly reduce the vibrations generated during vehicle driving and improve driving comfort. Damping enhancement materials do not generate dust and waste gas during production and use, and have little impact on the environment. However, traditional damping enhancement materials for cement stabilized macadam have the following disadvantages: National highways generally adopt a structure of thick cement stabilized macadam semi-rigid base + thin asphalt surface layer. Under the action of heavy-duty truck vehicles, vehicle vibrations are coupled with the road surface structure, accelerating the deterioration, fracture, and fragmentation of the semi-rigid base, and a series of secondary diseases occur. Summary of the Invention

[0003] The purpose of the present invention is to provide a damping enhancement coating material for the interface of cement stabilized macadam aggregate applicable to severe cold environments, so as to solve the problems in the above background technique that national highways generally adopt a structure of thick cement stabilized macadam semi-rigid base + thin asphalt surface layer. Under the action of heavy-duty truck vehicles, vehicle vibrations are coupled with the road surface structure, accelerating the deterioration, fracture, and fragmentation of the semi-rigid base, and a series of secondary diseases occur.

[0004] To achieve the above purpose, the present invention provides the following technical solutions: A damping enhancement coating material for the interface of cement stabilized macadam aggregate applicable to severe cold environments is composed of the following components in parts by weight: 30 - 40 parts of trimethoxysilylpropyl methacrylate, 20 - 30 parts of tung oil modified epoxy resin, 10 - 18 parts of nano-metakaolin, 1.5 - 3 parts of cobalt / calcium isooctanoate composite catalyst, 3 - 7 parts of phosphate modified graphene, 2 - 5 parts of fumed silica, and 0.3 - 0.5 parts of sodium dodecylbenzenesulfonate.

[0005] In the present invention, trimethoxysilane methacrylate: as a silane coupling agent, bridges tung oil modified epoxy resin with crushed stone aggregate and nano-metakaolin, enhances the interfacial bonding force, and prevents delamination. Tung oil modified epoxy resin: combines the high adhesiveness of epoxy resin and the flexibility of tung oil, enhances the adhesion of the coating to the aggregate and the resistance to stirring and peeling, and at the same time meets the damping performance requirements of the coating interface. Phosphate ester enhances dispersibility, and graphene forms a dense physical barrier to block water and corrosive media. Nano-metakaolin: fills the micropores of the coating, reduces the penetration path, and improves the interfacial salt corrosion resistance. Cobalt(II) isooctanoate / calcium composite catalyst: promotes the curing reaction of epoxy resin, shortens the curing time, and adjusts the curing rate to adapt to the construction temperature and transportation distance. Nano-metakaolin enhances the wear resistance and anti-stirring scratch resistance of the coating; fumed silica is used as a thixotropic agent to prevent sagging and improve the spraying adhesion performance of the overall coating material. Sodium dodecylbenzenesulfonate: as a dispersant, ensures uniform distribution of the coating fillers, avoids agglomeration, improves the coating uniformity and controls the coating thickness.

[0006] As a further illustration of the present invention, the nano-metakaolin is pretreated with a silane coupling agent KH-570, the pretreatment temperature is 110~120 °C, and the treatment time is 30~45 min.

[0007] The methoxy group (-OCH3) of KH-570 hydrolyzes to form silanol (-Si-OH), which forms a Si-O-Si covalent bond with the hydroxyl group (-OH) on the surface of metakaolin through a condensation reaction, grafts a methacryloyloxy organic chain segment on the surface of metakaolin, realizes the hydrophobicity and organic affinity of the metakaolin surface, reduces the van der Waals force between particles, inhibits agglomeration, makes the metakaolin more easily and uniformly dispersed in the epoxy resin matrix, improves the coating uniformity and controls the coating thickness; at the same time, it can reduce the surface energy of metakaolin, and reduce the adsorption and penetration path of water molecules.

[0008] The methacryloyloxy (CH2=C(CH3)-COO-) organic chain segment contains a double bond, which can undergo a free radical copolymerization reaction or a hydrogen bond interaction with the tung oil modified epoxy resin system, form a chemical bridge between the metakaolin and the organic resin, greatly improve the interfacial bonding strength, reduce stress concentration, enhance the adhesion of the coating to the aggregate and the resistance to stirring and peeling, and the tung oil meets the damping performance requirements of the coating interface.

[0009] As a further illustration of the present invention, the specific surface area of the nano-metakaolin is 15~25 m² / g. The larger the specific surface area of the nano-metakaolin, the more active sites on the particle surface, which can enhance the bonding efficiency with the silane coupling agent KH-570 and increase the interfacial chemical bond density. However, too high a specific surface area will lead to an increase in the van der Waals force between particles and easy agglomeration. It is determined that the best effect is achieved when the specific surface area of the nano-metakaolin is 15~25 m² / g.

[0010] As a further illustration of the present invention, the iodine value of the tung oil-modified epoxy resin is ≥ 150 g I2 / 100 g. The iodine value of the tung oil-modified epoxy resin reflects the double bond density of unsaturated fatty acids in tung oil. Due to the conjugated triene structure (α-eleostearic acid) in tung oil, when the iodine value is relatively high (about 160 - 170), the reaction activity is high, which can better react with epoxy groups to form a denser cross-linked network.

[0011] The present invention also provides a preparation method of the above cement-stabilized macadam aggregate interface damping enhancement coating material applicable to severe cold environments, including the following steps: Step 1, forming a matrix solution: Under nitrogen protection, trimethoxysilane methacrylate and tung oil-modified epoxy resin are premixed at 25 - 30 °C to form a matrix solution; Step 2, pretreating the matrix solution: Pretreated nano-metakaolin and phosphate-modified graphene are added to the matrix solution, and ultrasonic dispersion is carried out at 45 - 50 °C; Step 3, adding an activator: Cobalt / calcium isooctanoate composite catalyst, fumed silica, and sodium dodecylbenzenesulfonate are added to the matrix solution treated in Step 2, and shear mixing is carried out at 800 - 1000 rpm under light-shielded conditions to obtain a coating with a viscosity of 400 - 600 mPa·s.

[0012] In the method of the present invention, in Step 1, inert gas nitrogen is used for protection, which can prevent the methoxy group (-OCH3) of trimethoxysilane methacrylate from contacting with water vapor and undergoing premature hydrolysis (generating silanol -Si-OH), avoiding gel formation in the mixing stage. It inhibits the oxidation side reaction of unsaturated double bonds (high iodine value characteristics) in the tung oil-modified epoxy resin and maintains the resin reaction activity. At the same time, low-temperature premixing is specified. 25 - 30 °C is close to room temperature, which can ensure that the silane coupling agent and the epoxy resin only undergo physical mixing rather than chemical bonding, avoiding out-of-control system viscosity caused by premature cross-linking. Preliminary compatibility of the matrix: The organic chain segment (methacryloyloxy) of the silane coupling agent and the polar groups (such as hydroxyl groups and epoxy groups) of the epoxy resin are preliminarily combined through van der Waals forces, providing a uniform medium for subsequent filler dispersion.

[0013] In the method of the present invention, in Step 2, raising the temperature to 45 - 50°C can reduce the viscosity of the matrix solution, improve the wettability of the filler, and at the same time avoid premature curing of the epoxy resin caused by too high a temperature (the initial curing temperature of the epoxy resin is usually > 60°C). In addition, ultrasonic dispersion treatment is also used to break the soft agglomerates of nano-fillers (such as graphene sheet stacking and metakaolin aggregation) by the cavitation effect to ensure a monodisperse state. The ultrasonic energy promotes the pre-reaction between the methacryloxy group of the silane coupling agent (already grafted on metakaolin) and the epoxy resin to form preliminary chemical bonds. In this step, phosphoric acid ester modified graphene: its phosphate group may form a coordination bond with the aluminum hydroxyl group of metakaolin, enhancing the synergistic barrier effect of the two. Pretreated metakaolin: the organic chain segment of KH-570 is compatible with the epoxy resin, reducing the risk of phase separation.

[0014] In the method of the present invention, Step 3: Adding an activator and final mixing: Additive components: cobalt / calcium isooctanoate catalyst + fumed silica + sodium dodecylbenzenesulfonate, shear mixing at 800 - 1000 rpm under light shielding conditions, and the final viscosity is 400 - 600 mPa·s.

[0015] Purpose: 1. Light shielding conditions: Prevent cobalt isooctanoate (photosensitive) from prematurely initiating free radical reactions under light, resulting in premature polymerization of double bonds (tung oil modified epoxy resin) or methacryloxy groups of silane coupling agents.

[0016] 2. Shear mixing parameters: Rotation speed (800 - 1000 rpm): Provide sufficient shear force to disperse fumed silica (thixotropic agent) and sodium dodecylbenzenesulfonate (dispersant), and at the same time avoid introducing air bubbles or damaging the filler structure (such as graphene sheet fracture) due to too high a rotation speed.

[0017] Viscosity control (400 - 600 mPa·s): The nano-SiO2 particles of fumed silica form a hydrogen bond network, endowing the coating with thixotropy (high viscosity at rest to prevent sagging, and reduced viscosity under construction shear for easy coating).

[0018] 3. Catalyst function: Cobalt isooctanoate: Accelerate the oxidative crosslinking of epoxy resin (for tung oil double bonds) and free radical polymerization (for methacryloxy groups of silane).

[0019] Calcium isooctanoate: Assist in regulating the curing rate, avoid too fast a reaction caused by cobalt alone catalysis, and reduce shrinkage stress.

[0020] 4. Dispersant function: Sodium dodecylbenzenesulfonate is adsorbed on the surface of the filler, maintaining dispersion stability through electrostatic repulsion and preventing sedimentation during storage.

[0021] In summary, the highlights of the process design of the method of the present invention are summarized as follows: 1. Stage-by-stage mixing: First, a homogeneous matrix is formed in an inert environment, and then fillers and activators are introduced step by step to avoid competitive reactions caused by simultaneous addition of multiple components (such as direct interaction between a catalyst and a coupling agent).

[0022] 2. Temperature gradient control: Low-temperature premixing → medium-temperature dispersion → normal-temperature final mixing, matching the reaction activities of each component to ensure process safety.

[0023] 3. Interface engineering optimization: By pretreating with a silane coupling agent, ultrasonic dispersion, and shear mixing, a multi-level chemical bonding network of "resin - filler - additive" is constructed to maximize performance synergy.

[0024] The present invention also provides a spraying system for the cement-stabilized macadam aggregate interface damping enhancement coating material applicable to severe cold environments as described above, including a macadam surface treatment system. The macadam surface treatment system includes: a high-frequency micro-vibration conveyor belt, an adjustable-angle electrostatic spraying device, and a closed-loop control unit; The vibration frequency of the high-frequency micro-vibration conveyor belt is 15 - 20 Hz, and the amplitude is 0.5 - 1 mm; The spraying voltage of the adjustable-angle electrostatic spraying device is 30 - 50 kV, and the nozzle forms an angle of 45 - 60° with the high-frequency micro-vibration conveyor belt; The closed-loop control unit is provided with an integrated infrared thickness gauge and a particle size identification module.

[0025] The macadam surface treatment system of the spraying system of the present invention realizes a coating process with high precision, high efficiency, and low loss through the integration of a high-frequency micro-vibration conveyor belt, an adjustable-angle electrostatic spraying device, and a closed-loop control unit. The design principle and parameter selection basis are as follows: High-frequency micro-vibration (15 - 20 Hz) destroys the micro-bubbles in the coating through shear force, reducing coating pinhole defects; at the same time, it promotes the dynamic leveling of the coating on the substrate surface, eliminating the orange peel effect.

[0026] Amplitude selection: 0.5 - 1 mm ensures that the vibration energy is sufficient to drive the flow of the coating, but avoids excessive amplitude leading to coating splashing or substrate displacement.

[0027] Enhanced electrostatic adsorption: Voltage setting (30 - 50 kV): The high voltage charges the coating particles, which are adsorbed onto the grounded substrate surface through electrostatic force, improving the transfer efficiency and reducing coating waste, especially suitable for the particle shape of complex-shaped aggregates.

[0028] Upper limit control of voltage: Exceeding 50 kV may cause air breakdown (corona discharge), resulting in unstable spraying or safety hazards.

[0029] Optimization of spraying angle: 45 - 60° angle: Inclined spraying can reduce the "shadow effect" without dead angles. At the same time, the mirror charge effect is utilized to enhance the paint adsorption on the back surface, achieving uniform coverage.

[0030] Angle - adjustable design: It can adapt to different substrate shapes (such as flat plates, cylinders), avoiding the rebound loss caused by vertical spraying (90°).

[0031] Infrared thickness gauge: Based on near - infrared spectroscopy (NIR), it measures the wet film thickness non - contactly (accuracy ±1μm), and feeds back to the spraying system in real - time to dynamically adjust the spraying rate or the moving speed of the conveyor belt, ensuring uniform coating thickness (for example, a target of 400 - 600 mPa·s corresponds to a dry film of 20 - 30μm). It avoids the physical damage to the uncured coating by traditional contact thickness gauges.

[0032] Particle size identification module: It uses laser scattering or image analysis technology to monitor the particle distribution after paint atomization. If agglomerates (such as >80μm) are detected, it automatically triggers ultrasonic cleaning of the nozzle or adjusts voltage / air pressure parameters.

[0033] As a further illustration of the above - mentioned spraying system, the nozzle is provided with three concentric annular distribution holes. The hole diameters are 0.3mm, 0.5mm, and 0.8mm from the inside out in sequence. The rotation speed satisfies n = 0.83v², where v is the speed of the high - frequency micro - vibration conveyor belt, with the unit of m / s. The 0.3mm inner - layer hole diameter realizes ultra - fine atomization, and the 0.8mm outer - layer hole diameter realizes high - speed spraying for large - area coverage of aggregates. Through the coordination of gradient hole diameters and spatial distribution, the balance of atomization efficiency, coverage uniformity, and adaptability to complex morphologies is achieved.

[0034] The present invention also provides a spraying method for the spraying system of the above - mentioned cement - stabilized macadam aggregate interface damping - enhancing coating material applicable to severe cold environments, including the following steps: Step 1. Movement of gravel: The resonant gravel passes through the high - frequency micro - vibration conveyor belt at a speed of 1.8 - 2.2 m / s, triggering the self - rotation movement of the gravel, with a flip of ≥2 times per meter; Step 2. Adjusting the spraying distance: The dynamic PID algorithm is used to adjust the spraying distance: D = 0.15d² + 20, where D is in cm; d is the numerical value of the maximum particle size of the gravel, in mm; It should be noted that: in the above calculation formula, only the numerical values of the corresponding units are taken during the calculation, and new numerical units are assigned after obtaining the calculation result; Step 3. Spraying materials: The coating material is sprayed once under a pressure of 25 - 30 MPa, and the surface tension is controlled at 28 - 32 mN / m.

[0035] The spraying method of the present invention realizes efficient and uniform coating coverage on the surface of irregular gravel.

[0036] The speed of 1.8 - 2.2 m / s matches the critical tumbling speed of the crushed stones (related to particle size and density) to ensure stable spinning. The flipping of ≥2 times per meter ensures that all surfaces of the crushed stones (including edges, corners, and depressions) are fully exposed, avoiding spraying blind spots. High-frequency vibration strips the floating dust on the surface of the crushed stones, improving the coating adhesion.

[0037] Since larger-sized crushed stones require a greater spraying distance to cover the surface, for multi-graded crushed stones (such as d = 5 - 40 mm), the height of the spraying gun head is dynamically adjusted to ensure that the atomization cone angle covers the entire particle size range.

[0038] A supercritical pressure of 25 - 30 MPa breaks the coating material into 10 - 30 μm droplets, which penetrate the micropores of the crushed stones (pore diameter > 5 μm). The surface tension control of 28 - 32 mN / m ensures that the coating material can spread evenly on the surface of the crushed stones.

[0039] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The coating material of the present invention contains trimethoxysilyl methacrylate, modified epoxy resin, and surfactant. The ultrasonic dispersion and catalytic activation technologies are adopted in the preparation process, which can directly process the crushed stone aggregates with a high content of stone powder. The coating material and the crushed stone aggregates have high adhesion and high dispersibility, and the crushed stone aggregates wrapped with the coating material will not fall off or be damaged during the subsequent mixing process of the cement-stabilized crushed stone mixture.

[0040] 2. The hybrid system can form a coating with a modulus of 0.8 - 1.5 GPa on the surface of the crushed stones, and has high damping characteristics in the cement-stabilized crushed stone system.

[0041] 3. The high-efficiency treatment system developed in cooperation with the present invention realizes a single spraying wrapping rate of > 97% through the coupling effect of vibration - electrostatic spraying, and the production line speed can reach more than 32 t / h. Description of the Drawings

[0042] Figure 1 is the flow chart of the preparation method of the present invention; Figure 2 is the flow chart of the spraying system of the present invention. Detailed Embodiments

[0043] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention. Embodiment

[0044] A damping-enhanced coating material for the interface of cement-stabilized macadam aggregate applicable to severe cold environments, which is composed of the following components in parts by weight: 30 parts of trimethoxysilylpropyl methacrylate, 20 parts of tung oil-modified epoxy resin, 10 parts of nano-metakaolin, 1.5 parts of cobalt / calcium isooctanoate composite catalyst, 3 parts of phosphate ester-modified graphene, 2 parts of fumed silica, and 0.3 part of sodium dodecylbenzenesulfonate.

[0045] This example further illustrates that the nano-metakaolin is pretreated with a silane coupling agent KH-570, the pretreatment temperature is 110 °C, and the treatment time is 30 min.

[0046] This example further illustrates that the specific surface area of the nano-metakaolin is 15 m² / g.

[0047] This example further illustrates that the iodine value of the tung oil-modified epoxy resin is ≥150 g I2 / 100 g. Example

[0048] A damping-enhanced coating material for the interface of cement-stabilized macadam aggregate applicable to severe cold environments, which is composed of the following components in parts by weight: 40 parts of trimethoxysilylpropyl methacrylate, 30 parts of tung oil-modified epoxy resin, 18 parts of nano-metakaolin, 3 parts of cobalt / calcium isooctanoate composite catalyst, 7 parts of phosphate ester-modified graphene, 5 parts of fumed silica, and 0.5 part of sodium dodecylbenzenesulfonate.

[0049] This example further illustrates that the nano-metakaolin is pretreated with a silane coupling agent KH-570, the pretreatment temperature is 120 °C, and the treatment time is 45 min.

[0050] This example further illustrates that the specific surface area of the nano-metakaolin is 25 m² / g.

[0051] This example further illustrates that the iodine value of the tung oil-modified epoxy resin is ≥150 g I2 / 100 g. Example

[0052] A damping-enhanced coating material for the interface of cement-stabilized macadam aggregate applicable to severe cold environments, which is composed of the following components in parts by weight: 35 parts of trimethoxysilylpropyl methacrylate, 25 parts of tung oil-modified epoxy resin, 15 parts of nano-metakaolin, 2 parts of cobalt / calcium isooctanoate composite catalyst, 5 parts of phosphate ester-modified graphene, 3 parts of fumed silica, and 0.4 part of sodium dodecylbenzenesulfonate.

[0053] This example further illustrates that the nano-metakaolin is pretreated with a silane coupling agent KH-570, the pretreatment temperature is 115 °C, and the treatment time is 40 min.

[0054] This embodiment further illustrates that the specific surface area of the nano-metakaolin is 20 m² / g.

[0055] This embodiment further illustrates that the iodine value of the tung oil modified epoxy resin is ≥ 150 g I2 / 100 g. Example

[0056] A cement stabilized macadam aggregate interface damping enhancement coating material applicable to severe cold environments is composed of the following components in parts by weight: 30 parts of trimethoxysilylpropyl methacrylate, 30 parts of tung oil modified epoxy resin, 10 parts of nano-metakaolin, 3 parts of cobalt / calcium isooctanoate composite catalyst, 5 parts of phosphate modified graphene, 3 parts of fumed silica, and 0.3 part of sodium dodecylbenzenesulfonate.

[0057] This embodiment further illustrates that the nano-metakaolin is pretreated with the silane coupling agent KH-570, the pretreatment temperature is 110 °C, and the treatment time is 45 min.

[0058] This embodiment further illustrates that the specific surface area of the nano-metakaolin is 20 m² / g.

[0059] This embodiment further illustrates that the iodine value of the tung oil modified epoxy resin is ≥ 150 g I2 / 100 g. Example

[0060] A cement stabilized macadam aggregate interface damping enhancement coating material applicable to severe cold environments is composed of the following components in parts by weight: 35 parts of trimethoxysilylpropyl methacrylate, 20 parts of tung oil modified epoxy resin, 16 parts of nano-metakaolin, 1.5 parts of cobalt / calcium isooctanoate composite catalyst, 4 parts of phosphate modified graphene, 2 parts of fumed silica, and 0.5 part of sodium dodecylbenzenesulfonate.

[0061] This embodiment further illustrates that the nano-metakaolin is pretreated with the silane coupling agent KH-570, the pretreatment temperature is 120 °C, and the treatment time is 30 min.

[0062] This embodiment further illustrates that the specific surface area of the nano-metakaolin is 15 m² / g.

[0063] This embodiment further illustrates that the iodine value of the tung oil modified epoxy resin is ≥ 150 g I2 / 100 g. Example

[0064] A cement-stabilized macadam aggregate interface damping enhancement coating material applicable to severe cold environments is composed of the following components in parts by weight: 40 parts of trimethoxysilylpropyl methacrylate, 30 parts of tung oil-modified epoxy resin, 10 parts of nano-metakaolin, 1.5 parts of cobalt / calcium isooctanoate composite catalyst, 7 parts of phosphate ester-modified graphene, 5 parts of fumed silica, and 0.3 parts of sodium dodecylbenzenesulfonate.

[0065] This example further illustrates that the nano-metakaolin is pretreated with silane coupling agent KH-570, the pretreatment temperature is 120 °C, and the treatment time is 35 min.

[0066] This example further illustrates that the specific surface area of the nano-metakaolin is 25 m² / g.

[0067] This example further illustrates that the iodine value of the tung oil-modified epoxy resin is ≥150 g I2 / 100 g. Example

[0068] The method for preparing the cement-stabilized macadam aggregate interface damping enhancement coating material applicable to severe cold environments in the above Examples 1-6 is as Figure 1 shown, and includes the following steps: Step 1: Form a matrix solution: Premix trimethoxysilylpropyl methacrylate and tung oil-modified epoxy resin at 25-30 °C under nitrogen protection to form a matrix solution; Step 2: Pretreat the matrix solution: Add the pretreated nano-metakaolin and phosphate ester-modified graphene to the matrix solution, and perform ultrasonic dispersion at 45-50 °C; Step 3: Add surfactants: Add cobalt / calcium isooctanoate composite catalyst, fumed silica, and sodium dodecylbenzenesulfonate to the matrix solution treated in Step 2, and perform shear mixing at 800-1000 rpm under light-shielded conditions to obtain a coating with a viscosity of 400-600 mPa·s. Example

[0069] The spraying system of the cement-stabilized macadam aggregate interface damping enhancement coating material applicable to severe cold environments in the above Examples 1-6 includes a crushed stone surface treatment system; the crushed stone surface treatment system includes: a high-frequency micro-vibration conveyor belt, an adjustable-angle electrostatic spraying device, and a closed-loop control unit; The vibration frequency of the high-frequency micro-vibration conveyor belt is 15-20 Hz, and the amplitude is 0.5-1 mm; The spraying voltage of the adjustable-angle electrostatic spraying device is 30-50 kV, and the nozzle forms an angle of 45-60° with the high-frequency micro-vibration conveyor belt; The closed-loop control unit is provided with an integrated infrared thickness gauge and a particle size identification module.

[0070] The nozzle is provided with three layers of annular distribution holes, and the hole diameters are 0.3 / 0.5 / 0.8 mm. The rotation speed satisfies n = 0.83v², where v is the speed of the high-frequency micro-vibration conveyor belt, and the unit is m / s. Embodiment

[0071] The spraying method of the spraying system of the above-mentioned Embodiment 8 is as Figure 2 shown, and includes the following steps: Step 1. Movement of crushed stones: Pass the resonance crushed stones through the high-frequency micro-vibration conveyor belt at a speed of 1.8 - 2.2 m / s to trigger the self-rotation movement of the crushed stones, and the number of flips is ≥ 2 times / meter; Step 2. Adjust the spraying distance: Use the dynamic PID algorithm to adjust the spraying distance: D = 0.15d² + 20, where d is the value of the maximum particle size of the crushed stones; Step 3. Spraying material: Spraying the coating material once under a pressure of 25 - 30 MPa, and controlling the surface tension at 28 - 32 mN / m.

[0072] Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A cement-stabilized macadam aggregate interface damping enhancement coating material applicable to severe cold environments, characterized in that, It consists of the following components in parts by weight: 30 - 40 parts of trimethoxysilylpropyl methacrylate, 20 - 30 parts of tung oil modified epoxy resin, 10 - 18 parts of nano - metakaolin, 1.5 - 3 parts of cobalt / isooctanoate calcium composite catalyst, 3 - 7 parts of phosphate - modified graphene, 2 - 5 parts of fumed silica, and 0.3 - 0.5 parts of sodium dodecylbenzenesulfonate.

2. The cement-stabilized macadam aggregate interface damping enhancement coating material applicable to severe cold environments according to claim 1, characterized in that: The nano - metakaolin is pretreated with silane coupling agent KH - 570 at a pretreatment temperature of 110 - 120 °C for 30 - 45 min.

3. The cement-stabilized macadam aggregate interface damping enhancement coating material applicable to severe cold environments according to claim 1, characterized in that: The specific surface area of the nano - metakaolin is 15 - 25 m² / g.

4. The cement stabilized macadam aggregate interface damping enhanced coating material applicable to severe cold environment according to claim 1, characterized in that: The iodine value of the tung oil modified epoxy resin is ≥150 g I2 / 100 g.

5. The damping enhancement coating material for the interface of cement stabilized macadam aggregate applicable to severe cold environment according to any one of claims 1-4, characterized in that, The preparation method of the material includes the following steps: Step 1, forming a matrix solution: Under nitrogen protection, trimethoxysilylpropyl methacrylate and tung oil modified epoxy resin are premixed at 25 - 30 °C to form a matrix solution; Step 2, pretreating the matrix solution: The pretreated nano - metakaolin and phosphate - modified graphene are added to the matrix solution, and ultrasonic dispersion is carried out at 45 - 50 °C; Step 3, adding active agents: The cobalt / isooctanoate calcium composite catalyst, fumed silica, and sodium dodecylbenzenesulfonate are added to the matrix solution treated in Step 2, and shear mixing is carried out at 800 - 1000 rpm under light - proof conditions to obtain a coating with a viscosity of 400 - 600 mPa·s.

6. A spraying system for a cement-stabilized macadam aggregate interface damping enhancement coating material applicable to severe cold environments as described in any one of claims 1-4, including a macadam surface treatment system, characterized in that: The gravel surface treatment system includes: a high - frequency micro - vibration conveyor belt, an adjustable - angle electrostatic spraying device, and a closed - loop control unit; The vibration frequency of the high - frequency micro - vibration conveyor belt is 15 - 20 Hz, and the amplitude is 0.5 - 1 mm; The spraying voltage of the adjustable - angle electrostatic spraying device is 30 - 50 kV, and the nozzle forms an angle of 45 - 60° with the high - frequency micro - vibration conveyor belt; The closed - loop control unit is equipped with an integrated infrared thickness gauge and a particle size identification module.

7. The spraying system of the cement stabilized macadam aggregate interface damping enhancement coating material applicable to severe cold environments according to claim 6, characterized in that: The nozzle is provided with three concentric annular distribution holes, and the hole diameters are 0.3 mm, 0.5 mm, and 0.8 mm from the inside to the outside in sequence. The rotation speed satisfies n = 0.83v², where v is the speed of the high - frequency micro - vibration conveyor belt in m / s.

8. The spraying system for the cement stabilized macadam aggregate interface damping enhancement coating material applicable to severe cold environments according to any one of claims 6-7, characterized in that, The spraying method of the spraying system includes the following steps: Step 1, gravel movement: The resonant gravel passes through the high - frequency micro - vibration conveyor belt at a speed of 1.8 - 2.2 m / s, triggering the self - rotation movement of the gravel, with a flip of ≥2 times per meter; Step 2, adjusting the spraying distance: The dynamic PID algorithm is used to adjust the spraying distance: D = 0.15d² + 20, where d is the value of the maximum particle size of the gravel; Step 3, spraying materials: The coating material is sprayed once under a pressure of 25 - 30 MPa, and the surface tension is controlled at 28 - 32 mN / m.

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