Severe cold low-density road crack pouring sealant and preparation method thereof

Abstract

The invention discloses a severe cold low-density road crack pouring sealant and a preparation method thereof, the crack pouring sealant comprises 90 # matrix asphalt, blended oil, rubber powder, an SBS modifier, a stabilizer and the like, the components are non-toxic, the safety of workers is improved, and the sealant is environment-friendly; the prepared severe cold low-density road crack pouring sealant has good adhesive force, can be firmly bonded with a pavement, has good low-temperature performance, has relatively low density, can treat cracks with longer distances, is suitable for pavement crack pouring treatment in severe cold areas of-40 DEG C, can effectively seal cracks, and does not generate brittle rupture or failure. The preparation method of the crack pouring sealant is simple, the designed integrated preparation equipment of the severe cold low-density road crack pouring sealant is small in occupied area and portable, preparation can be carried out on a construction site, the integrated function from material proportioning to finished product output is closed, and the flowability of the sealant and the construction timeliness are improved.

Description

Technical Field

[0001] This invention belongs to the field of road maintenance technology, and in particular relates to a cold-resistant, low-density road crack sealant and its preparation method. Background Technology

[0002] Semi-rigid base courses possess excellent slab-like properties, stiffness, stress diffusion, tensile strength, fatigue strength, and water stability, and are moderately priced, making them a major form of road base course in my country. Semi-rigid base courses are inorganic stabilized mixtures, including cement-stabilized, cement-fly ash-stabilized, and lime-fly ash-stabilized types, with cement-stabilized types being the most widely used. With the continuous development of asphalt materials, strong-base, thin-surface semi-rigid base asphalt pavements that conform to the pavement structure composition in my country are widely used in highways of all grades.

[0003] However, under the combined effects of temperature and load, semi-rigid base asphalt pavement is prone to transverse and longitudinal cracks in the early stages. If crack sealing is not carried out in time, the pavement performance and service life will deteriorate under the long-term effects of rain and snow, leading to pavement structure damage and increasing the cost of later maintenance.

[0004] Currently, the main methods for treating cracks in semi-rigid base asphalt pavements include crack sealing tape and crack filling adhesive. Crack sealing tape is divided into self-adhesive type (applied at room temperature) and hot-applied type (applied by heating). It has gained some application due to its high efficiency and the fact that it eliminates the need for grooving the cracks; however, its durability is relatively poor, and the tape often only covers the surface of the crack, failing to completely fill it. Crack filling adhesive is divided into cold-applied liquid crack filling adhesive and hot-applied liquid crack filling adhesive. Cold-applied liquid crack filling adhesive includes modified emulsified asphalt and solvent-based rubber asphalt. These two types are easily affected by climate, resulting in poor adhesion, long curing time, and inability to quickly open the road to traffic. Therefore, hot-applied crack filling adhesive remains the primary method for crack treatment.

[0005] However, the quality of current hot-applied crack sealants varies greatly, with high density resulting in insufficient fullness after filling cracks. They are particularly unsuitable for treating cracks in extremely cold regions (-40℃). For example, Chinese patents CN107987791A discloses a cold-resistant asphalt pavement crack sealant, and CN119529761A discloses a wide-temperature-range crack sealant, which can be used in environments of -20℃ and -30℃ respectively, but their performance in -40℃ environments is generally poor. Furthermore, the main components contributing to their cold resistance are polyamic acid and dibutyl phthalate, which have certain chemical toxicity, posing safety risks during preparation and potentially entering the environment through precipitation. Therefore, there is a need to research a new type of crack sealant that is environmentally friendly and can be used in conditions down to -40℃.

[0006] In addition to the selection of raw materials, the formulation and preparation method are also crucial for optimizing the performance of crack sealant. Precision formulation and process control place stringent demands on the metering accuracy, temperature control capabilities, and shear-mixing efficiency of the equipment. Furthermore, current preparation processes often use independent systems for batching, heating, and mixing, separating the sealant preparation from the application process, which restricts the timeliness and reliability of crack sealing applications in cold regions. Therefore, for the novel crack sealant researched in this application, a precise, efficient preparation method and equipment are needed that allows for on-site preparation and use of the sealant. Summary of the Invention

[0007] The first objective of this invention is to provide a cold-resistant, low-density road crack sealant that meets the requirements of cold-resistant sealants, possessing good viscosity, high-temperature stability, compression recovery ability, and low-temperature crack resistance, and can be used in cold regions at -40°C and below.

[0008] The second objective of this invention is to provide a method for preparing a cold-resistant, low-density road crack sealant. The preparation method is simple, and the resulting crack sealant has good performance.

[0009] The first objective of this invention is achieved by the following technical solution: A cold-resistant, low-density road crack sealant comprises the following raw materials in parts by weight: 40-45 parts of 90# base asphalt, 27-35 parts of blending oil, 15-25 parts of rubber powder, 3-5 parts of SBS modifier, and 0.1-0.3 parts of stabilizer.

[0010] 90# base asphalt: Compared with other grades of asphalt (such as 70#, 85#, etc.), the advantages of 90# base asphalt are mainly reflected in its stronger high temperature resistance, better rutting resistance, longer service life, excellent anti-aging properties and better sealing effect.

[0011] Blending oil: Blending oil is mainly used to improve the low-temperature performance of the sealant, so that it can maintain good flexibility in low-temperature environments and avoid cracking.

[0012] Rubber powder: Rubber powder is derived from the recycling of waste tires. Reusing rubber powder in crack sealant has good environmental benefits, reducing the accumulation and pollution of waste tires, and meeting the needs of green construction and sustainable development. At the same time, rubber powder can significantly improve the elasticity of asphalt, making the crack sealant more flexible, able to adapt to the thermal expansion and contraction of the road, and preventing cracks from occurring or further expanding.

[0013] SBS modifier: SBS modifier mainly improves the flexibility and elasticity of asphalt, increases its high-temperature resistance, and improves its weather resistance. The addition of this weight of SBS modifier can improve the crack resistance of asphalt, reduce cracks caused by fatigue or temperature stress during road use, and maintain road stability for a longer period of time.

[0014] Stabilizer: The addition of stabilizer is to improve the long-term performance and reliability of the crack sealant, ensuring that it can perform its best repair effect under different environmental conditions.

[0015] The second objective of this invention is achieved by the following technical solution: A method for preparing a low-density road crack sealant for extreme cold conditions, comprising the following steps: S1. Prepare the following raw materials in parts by weight: 40-45 parts of 90# base asphalt, 27-35 parts of blending oil, 15-25 parts of rubber powder, 3-5 parts of SBS modifier, and 0.1-0.3 parts of stabilizer. S2. Heat the blended oil, and then stir and mix the heated blended oil with the 90# base asphalt to obtain the first intermediate product; S3. After heating the first intermediate product, add the SBS modifier and the stabilizer, stir and mix well to obtain the second intermediate product. S4. Cut the second intermediate product, then add the rubber powder, stir and mix well to obtain the third intermediate product; S5. The third intermediate product is developed to obtain a cold-resistant, low-density road crack sealant.

[0016] Furthermore, in step S2, the blended oil is heated to 75-80°C; the heated blended oil and the 90# base asphalt are stirred for 2-4 minutes at a stirring speed of 250 rpm. Premixing at 80°C can prevent the volatilization of components at high temperatures, ensure uniform dispersion of the blended oil, reduce the risk of phase separation during subsequent high-temperature reactions, and allow the low-temperature performance of the sealant to be better utilized.

[0017] Further, in step S3, the first intermediate product is heated to 160~165℃; the stirring time of the SBS modifier, the stabilizer and the first intermediate product is 10~15 min and the stirring speed is 250 rpm.

[0018] Further, in step S4, the second intermediate product is sheared at a temperature of 170-175°C for 50-60 minutes at a shearing speed of 400 rpm; the rubber powder and the second intermediate product are stirred at a temperature of 190-200°C for 4-5 hours at a stirring speed of 250 rpm. High temperature promotes the swelling of the rubber powder and accelerates the depolymerization of the cross-linked network; prolonged low-speed stirring ensures that all materials are mixed uniformly.

[0019] Furthermore, in step S5, the development temperature of the third intermediate product is 200-210℃, and the development time is 50-60 min. High-temperature development accelerates molecular chain recombination, while the short development time avoids excessive oxidation, balancing performance and production efficiency. Moreover, the temperature is set to increase in stages from mixing to development to avoid localized overheating and to facilitate accurate control of the heating function of the integrated preparation equipment described below.

[0020] Furthermore, steps S2, S3, S4, and S5 are completed using an integrated preparation equipment for cold-weather-type low-density road crack sealant; the integrated preparation equipment for cold-weather-type low-density road crack sealant includes: A grip cylinder, one end of which is fixedly connected to a proportioning component, and the grip cylinder has a built-in driving component. A mixing component is provided at the end of the proportioning component away from the grip cylinder. The proportioning component includes a storage cylinder, one end of which is fixedly connected to the gripping cylinder. The storage cylinder includes multiple proportioning cylinders, which are distributed around the gripping cylinder to form the storage cylinder. A pusher plate is built into the proportioning cylinder. The drive assembly includes multiple push rods, each of which is fixedly connected to multiple push plates. A moving disc is fixedly connected to the end of each push rod away from the push plate. The moving disc is placed inside the grip cylinder and is slidably connected to the inner wall of the grip cylinder around its perimeter. An inclined plate is provided on the side of the moving disc away from the push rods. A positioning rod is provided between the moving disc and the inclined plate. A motor is provided on the side of the inclined plate away from the moving disc. A drive roller is fixedly connected to the output end of the motor. The end of the drive roller away from the motor is fixedly connected to the inclined plate. A fixed seat is sleeved and fixedly fixed on the surface of the motor. The end of the fixed seat away from the motor is fixedly connected to the inner wall of the grip cylinder. The mixing assembly includes a mixing cylinder, inside which a servo motor is installed. A stirring blade is fixedly connected to the output end of the servo motor. A stirring blade is fixedly installed at the tail end of the servo motor and a storage cylinder. A filling head is fixedly connected to the end of the mixing cylinder away from the holding cylinder. An installation chamber is opened inside the wall of the mixing cylinder, and an electric heating wire is installed inside the installation chamber.

[0021] Furthermore, multiple proportioning cylinders are evenly distributed around the axis of the gripping cylinder, and the multiple proportioning cylinders are fixedly connected to each other; a solenoid valve is fixedly connected to the side of the proportioning cylinder away from the axis of the gripping cylinder, and a feeding window is opened on the side of the proportioning cylinder near the mixing component, and a solenoid valve is also installed in the feeding window.

[0022] Furthermore, an assembly ring is fixedly connected to one end of the mixing cylinder near the storage cylinder, and a connecting ring is fixedly connected to one end of the proportioning cylinder near the mixing component. The outer ring wall of the connecting ring and the inner ring wall of the assembly ring are provided with matching threads, and the connecting ring and the assembly ring are threadedly fixed.

[0023] Furthermore, a guide seat is fixedly connected to one side of the motion disc, and a guide groove is provided on the inner wall of the grip cylinder. The guide seat is slidably connected to the groove wall of the guide groove. One end of the positioning rod is fixedly connected to the motion disc, and a motion ball is fixedly connected to the other end of the positioning rod. A sliding ring groove is provided on the surface of the tilting disc. The motion ball is placed in the sliding ring groove and is slidably connected to the inner wall of the sliding ring groove. A limit window is provided on the surface of the tilting disc.

[0024] Beneficial effects: This invention provides a low-density road crack sealant for extreme cold conditions and its preparation method, which has the following advantages: (1) The main components of the cold-resistant low-density road crack sealant of the present invention are 90# base asphalt, blending oil, rubber powder, SBS modifier and stabilizer. The components are non-toxic, which improves worker safety and is environmentally friendly.

[0025] (2) The prepared cold-resistant low-density road crack sealant has good adhesion, can bond firmly to the road surface, has good low-temperature performance, and has a low density (1.03 g / cm³). 3 It can treat cracks over longer distances and is suitable for crack sealing in areas with temperatures as low as -40°C. It can effectively seal cracks without causing brittleness or failure.

[0026] (3) The preparation method is simple. The integrated preparation equipment for the cold-resistant low-density road crack sealant has a small footprint and is portable. It can be prepared on the construction site without the need for manufacturer preparation or long-distance transportation. Furthermore, the integrated closed-loop function from material ratio to finished product output allows for heat preservation, stirring and crack filling operations after the crack sealant is prepared in the equipment, improving the fluidity of the adhesive and the timeliness of construction. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art 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.

[0028] Figure 1 A schematic diagram of the preparation method of a low-density road crack sealant for extreme cold conditions; Figure 2 A schematic diagram of the overall structure of an integrated preparation equipment for low-density road crack sealant in extreme cold conditions; Figure 3 A schematic diagram of the overall second-view structure of an integrated preparation equipment for low-density road crack sealant in extreme cold conditions; Figure 4 A schematic diagram of the overall exploded structure of an integrated preparation equipment for low-density road crack sealant in extreme cold conditions; Figure 5 A second-view structural diagram of the overall explosion-proof low-density road crack sealant integrated preparation equipment for extreme cold conditions. Figure 6 A schematic diagram of the exploded structure of the mixing components for an integrated preparation equipment of low-density road crack sealant for extreme cold conditions; Figure 7 A schematic diagram of the mixing components for an integrated preparation equipment of low-density road crack sealant for extreme cold conditions; Figure 8 A schematic diagram of the drive component structure for an integrated preparation equipment of low-density road crack sealant for extreme cold conditions; Figure 9 Exploded view of the drive component of an integrated preparation equipment for low-density road crack sealant in extreme cold conditions; Figure 10 A schematic diagram of the hybrid component structure of an integrated preparation equipment for low-density road crack sealant in extreme cold conditions; Figure 11 A schematic diagram of the exploded structure of the mixed components of an integrated preparation equipment for low-density road crack sealant in extreme cold conditions.

[0029] In the diagram: 1. Handle; 101. Handle; 2. Proportioning component; 201. Storage cylinder; 202. Proportioning cylinder; 203. Solenoid valve; 204. Connecting ring; 205. Propeller plate; 206. Fixed ring groove; 207. Sealing ring; 208. Feed window; 3. Drive component; 301. Push rod; 302. Moving disc; 303. Guide seat; 304. Guide groove; 305. Positioning rod; 306. Moving ball; 307. Inclined disc; 308. Sliding ring groove; 309. Limiting window; 310. Motor; 311. Drive roller; 312. Fixed seat; 4. Mixing component; 401. Mixing cylinder; 402. Filling head; 403. Assembly ring; 404. Installation chamber; 405. Heating wire; 406. Servo motor; 407. Stirring blade. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. In the description of the present invention, it should be noted that the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] Example 1 A method for preparing a low-density road crack sealant suitable for extreme cold conditions, such as... Figure 1 As shown, it includes the following steps: S1. Prepare the following raw materials in parts by weight: 40-45 parts asphalt, 27-35 parts blending oil, 15-25 parts rubber powder, 3-5 parts SBS modifier, and 0.1-0.3 parts stabilizer; In this invention, the asphalt is 90# base asphalt, the blending oil is naphthenic oil, the SBS modifier is thermoplastic styrene-butadiene rubber, and the stabilizer is 92% sulfur powder + 8% 264 antioxidant.

[0032] S2. Heat the blended oil to 75~80℃, add the heated blended oil to 90# base asphalt and stir to mix well to obtain the first intermediate product. The stirring time is 2~4 min and the stirring speed is 250 rpm. S3. Heat the first intermediate product to 160~165℃, then add SBS modifier and stabilizer, stir and mix well for 10~15 min at a stirring speed of 250 rpm to obtain the second intermediate product. S4. Shear the second intermediate product at a shearing temperature of 170~175℃, a shearing time of 50~60 min, and a shearing speed of 400 rpm. Add rubber powder to the sheared second intermediate product, stir and mix well at a stirring temperature of 190~200℃, a stirring time of 4~5 h, and a stirring speed of 250 rpm to obtain the third intermediate product. S5. The third intermediate product is developed at 200~210℃ for 50~60 min. After development, a cold-resistant, low-density road crack sealant is obtained.

[0033] Example 2 A method for preparing a low-density road crack sealant for extreme cold conditions, comprising the following steps: S1. Prepare the following raw materials in parts by weight: 40 parts of 90# base asphalt, 27 parts of blending oil, 15 parts of rubber powder, 3 parts of SBS modifier, and 0.1 parts of stabilizer. S2. Heat the blended oil to 80°C, add the heated blended oil to 90# base asphalt and stir to mix well to obtain the first intermediate product. The stirring time is 2 min and the stirring speed is 250 rpm. S3. Heat the first intermediate product to 162°C, then add SBS modifier and stabilizer, stir and mix well for 10 min at a speed of 250 rpm to obtain the second intermediate product. S4. Shear the second intermediate product at a shearing temperature of 170~175℃, a shearing time of 1 h, and a shearing speed of 400 rpm; add rubber powder to the sheared second intermediate product, stir and mix well at a stirring temperature of 190℃, a stirring time of 4 h, and a stirring speed of 250 rpm to obtain the third intermediate product. S5. The third intermediate product is developed at 200℃ for 1 hour. After development, a cold-resistant, low-density road crack sealant is obtained.

[0034] Example 3 A method for preparing a low-density road crack sealant for extreme cold conditions, comprising the following steps: S1. Prepare the following raw materials in parts by weight: 43 parts of 90# base asphalt, 31 parts of blending oil, 20 parts of rubber powder, 4 parts of SBS modifier, and 0.2 parts of stabilizer. S2. Heat the blended oil to 80°C, add the heated blended oil to 90# base asphalt and stir to mix well to obtain the first intermediate product. The stirring time is 2 min and the stirring speed is 250 rpm. S3. Heat the first intermediate product to 165°C, then add SBS modifier and stabilizer, stir and mix well for 10 min at a speed of 250 rpm to obtain the second intermediate product. S4. Shear the second intermediate product at a shearing temperature of 170~175℃, a shearing time of 1 h, and a shearing speed of 400 rpm; add rubber powder to the sheared second intermediate product, stir and mix well at a stirring temperature of 195℃, a stirring time of 4 h, and a stirring speed of 250 rpm to obtain the third intermediate product. S5. The third intermediate product is developed at 200℃ for 1 hour. After development, a cold-resistant, low-density road crack sealant is obtained.

[0035] Example 4 A method for preparing a low-density road crack sealant for extreme cold conditions, comprising the following steps: S1. Prepare the following raw materials in parts by weight: 45 parts of 90# base asphalt, 35 parts of blending oil, 25 parts of rubber powder, 5 parts of SBS modifier, and 0.3 parts of stabilizer. S2. Heat the blended oil to 80°C, add the heated blended oil to 90# base asphalt and stir to mix well to obtain the first intermediate product. The stirring time is 2 min and the stirring speed is 250 rpm. S3. Heat the first intermediate product to 163°C, then add SBS modifier and stabilizer, stir and mix well for 10 min at a speed of 250 rpm to obtain the second intermediate product. S4. Shear the second intermediate product at a shearing temperature of 170~175℃, a shearing time of 1 h, and a shearing speed of 400 rpm; add rubber powder to the sheared second intermediate product, stir and mix well at a stirring temperature of 195℃, a stirring time of 4 h, and a stirring speed of 250 rpm to obtain the third intermediate product. S5. The third intermediate product is developed at 200℃ for 1 hour. After development, a cold-resistant, low-density road crack sealant is obtained.

[0036] Comparative Example 1 A method for preparing a cold-resistant, low-density road crack sealant is the same as in Example 2, except that the amount of oil used in the preparation is 1 part.

[0037] Comparative Example 2 A cold-resistant asphalt pavement crack sealant, the raw materials and preparation method of which refer to Example 1 of patent CN107987791A.

[0038] Comparative Example 3 A wide temperature range grouting adhesive, the raw materials and preparation method of which refer to paragraph

[0152] of patent CN119529761A.

[0039] Example 5 An integrated preparation equipment for low-density road crack sealant suitable for extreme cold conditions, such as... Figure 2-11 As shown, it includes a gripping cylinder 1, a handle 101 fixedly connected to one side of the gripping cylinder 1, a proportioning component 2 fixedly connected to one end of the gripping cylinder 1, a drive component 3 built into the gripping cylinder 1, and a mixing component 4 provided at the end of the proportioning component 2 away from the gripping cylinder 1; the device solves the technical shortcomings of traditional preparation equipment through the coordinated work of each component.

[0040] The proportioning component 2 includes a storage cylinder 201, one end of which is fixedly connected to the gripping cylinder 1. The storage cylinder 201 includes multiple proportioning cylinders 202, which are evenly distributed around the axis of the gripping cylinder 1 and fixedly connected to each other. The multiple proportioning cylinders 202 are distributed around the gripping cylinder 1 to form the storage cylinder 201. A solenoid valve 203 is fixedly connected to the side of the proportioning cylinder 202 away from the axis of the gripping cylinder 1. A feed window 208 is opened on the side of the proportioning cylinder 202 near the mixing component 4. A solenoid valve 203 is also installed inside the 08. A pusher plate 205 is built into the proportioning cylinder 202. A fixed ring groove 206 is opened around the pusher plate 205. A sealing ring 207 is sleeved in the fixed ring groove 206. The outer ring wall of the sealing ring 207 contacts the inner wall of the pusher plate 205. The proportioning component 2 of the equipment takes the storage cylinder 201 as the core carrier. It is composed of multiple proportioning cylinders 202 that are evenly distributed around the axis of the holding cylinder 1 and fixedly connected to each other. This ring distribution structure provides a physical basis for the independent storage and proportioning of different materials. Each proportioning cylinder 202 is equipped with a solenoid valve 203 on its outer wall away from the axis of the holding cylinder 1 and at the feed window 208 near the mixing component 4. The solenoid valve 203 on the outer wall controls the injection of the corresponding proportioned material. During injection, the solenoid valve 203 at the feed window 208 remains closed to prevent material leakage or mixing disorder. When it is necessary to push the material to the mixing component 4, the solenoid valve 203 on the outer wall closes and the solenoid valve 203 at the feed window 208 opens to ensure that the material flows along a predetermined path. The pusher plate 205 inside the proportioning cylinder 202 has fixed annular grooves 206 around its perimeter and is fitted with sealing rings 207. The outer annular wall of the sealing ring 207 is in close contact with the inner wall of the proportioning cylinder 202. This design not only ensures the sealing performance of the pusher plate 205 when it slides inside the proportioning cylinder 202 to prevent material leakage during the pushing process, but also controls the pushing of the material by moving the pusher plate 205. Operators can inject the prepared materials into each mixing cylinder 202 to lay the foundation for subsequent precise mixing.

[0041] Meanwhile, multiple push rods 301 are provided in the drive assembly 3. Each push rod 301 is fixedly connected to multiple push plates 205. A moving disc 302 is fixedly connected to the end of each push rod 301 away from the push plate 205. The moving disc 302 is placed inside the grip cylinder 1, and its periphery is slidably connected to the inner wall of the grip cylinder 1. A guide seat 303 is fixedly connected to one side of the moving disc 302. A guide groove 304 is provided on the inner wall of the grip cylinder 1, and the guide seat 303 is slidably connected to the groove wall of the guide groove 304. An inclined disc 307 is provided on the side of the moving disc 302 away from the push rods 301. A positioning rod 305 is provided between the moving disc 302 and the inclined disc 307. One end of the positioning rod 305 is fixedly connected to the moving disc 302, and the other end is fixedly connected to a moving ball 306. The 07 disc surface has a sliding ring groove 308, and the moving ball 306 is placed in the sliding ring groove 308. The moving ball 306 is slidably connected to the inner wall of the sliding ring groove 308. The tilting disc 307 has a limit window 309. The side of the tilting disc 307 away from the moving disc 302 is equipped with a motor 310. The output end of the motor 310 is fixedly connected to a drive roller 311. The end of the drive roller 311 away from the motor 310 is fixedly connected to the tilting disc 307. A fixed seat 312 is sleeved and fixed on the surface of the motor 310. The end of the fixed seat 312 away from the motor 310 is fixedly connected to the inner wall of the gripping cylinder 1. The drive assembly 3 is the power core of the equipment. Through a series of precisely matched parts, the rotational motion of the motor 310 is converted into the linear reciprocating motion of the push plate 205. Multiple push rods 301 are fixedly connected at one end to the push plate 205 and at the other end to the moving disk 302. The moving disk 302 is placed inside the grip cylinder 1 and is slidably connected to the inner wall of the grip cylinder 1. A guide seat 303 on one side is embedded in the guide groove 304 on the inner wall of the grip cylinder 1 to ensure that the moving disk 302 slides smoothly in a fixed direction during movement, avoiding deviation or shaking. An inclined disk 307 is provided on the side of the moving disk 302 away from the push rods 301. The two are connected by a positioning rod 305. One end of the positioning rod 305 is fixed to the moving disk 302, and the other end, a moving ball 306, is placed in the sliding ring groove 308 on the surface of the inclined disk 307 and slides in contact with the groove wall. When the motor 310 drives the inclined disk 307 to rotate via the drive roller 311, the position of the moving ball 306 within the sliding ring groove 308 changes as the inclined disk 307 rotates due to its tilt angle. When the inclined disk 307 reaches its highest point and rotates towards the moving disk 302, the moving ball 306 pushes the positioning rod 305, causing the moving disk 302 to move backward. When the inclined disk 307 reaches its lowest point and rotates towards the moving disk 302, the moving disk 302 moves forward under the action of the reset force, thus causing the moving disk 302 to reciprocate towards or away from the inclined disk 307. This motion is transmitted to the pusher plate 205 via the pusher rod 301, causing the pusher plate 205 to reciprocate linearly within the proportioning cylinder 202, thereby pushing and resetting the proportioned materials.The limiting window 309 on the tilting plate 307, in conjunction with related structures, further ensures the stability and accuracy of the movement, ensuring that multiple push plates 205 can move synchronously, thereby realizing the pushing of materials with different proportions.

[0042] A mixing cylinder 401 is provided in the mixing component 4. A filling head 402 is fixedly connected to the end of the mixing cylinder 401 away from the holding cylinder 1. The filling head 402 is provided with an opening and closing valve. An assembly ring 403 is fixedly connected to the end of the mixing cylinder 401 near the storage cylinder 201. A connecting ring 204 is fixedly connected to the end of the proportioning cylinder 202 near the mixing component 4. The outer ring wall of the connecting ring 204 and the inner ring wall of the assembly ring 403 are provided with matching threads. The connecting ring 204 and the assembly ring 403 are threadedly fixed. A servo motor 40 is provided inside the mixing cylinder 401. 6. The output end of the servo motor 406 is fixedly connected to the stirring fan blade 407, and the tail end of the servo motor 406 is fixedly connected to the storage cylinder 201; the mixing cylinder 401 has an installation chamber 404 inside its wall, and an electric heating wire 405 is installed inside the installation chamber 404. The electric heating wire 405 is made of high-temperature resistant alloy material, and the heating power can be adjusted by the temperature control system. The mixing cylinder 401 of the mixing component 4 is fixed to the proportioning component 2 by the threaded connection of the connecting ring 204 and the assembly ring 403. This detachable connection method facilitates the installation, debugging and maintenance of the equipment. One end of the mixing drum 401 near the handle 1 is connected to the feed window 208 of the proportioning component 2. When the pusher plate 205 pushes the proportioned material into the mixing drum 401 through the open feed window 208 via the solenoid valve 203, the heating wire 405 in the chamber 404 inside the mixing drum 401 heats the material entering the mixing drum 401 according to the requirements of different steps. The servo motor 406 inside the mixing drum 401 drives the stirring blades 407 to move the material. In cold regions, low temperatures can easily cause the rubber compound to cool and flow more slowly. The heating function of the heating wire 405 effectively maintains the fluidity of the rubber compound, preventing uneven mixing or performance degradation due to excessively low temperatures. The stirring blades 407 drive the material to rotate and mix, ensuring the fusion of the base asphalt and blending oil, efficient dispersion of the SBS modifier, and uniform coating of the rubber powder. After mixing, stirring is stopped to allow for development. Once development is complete, the prepared low-density road crack sealant for extreme cold conditions is output through the injection head 402, which is fixedly connected to the other end of the mixing cylinder 401, for use in road crack filling operations. The entire process is completed in one integrated unit within the equipment, avoiding the separation of sealant preparation and application stages found in traditional equipment. The system can adjust process parameters such as heating temperature in real time according to actual on-site conditions, reducing the risk of performance loss due to temperature changes during transportation and significantly improving the timeliness and reliability of crack sealing construction in extremely cold regions.

[0043] Furthermore, the integrated design of the equipment results in a compact overall structure and convenient operation. The ingenious design of using a motor 310 to drive the tilting disc 307, which in turn drives multiple push plates 205 synchronously, enables the simultaneous delivery of multi-component materials, improving production efficiency. Optimization of details such as the sealing ring 207, guide seat 303, and guide groove 304 further ensures the stability and sealing of the equipment, providing strong support for long-term reliable operation in frigid environments. This lays a solid foundation for solving problems such as incomplete filling and short service life of traditional hot-applied sealant in cold regions, starting from the manufacturing stage.

[0044] Working principle: When using this equipment to prepare and use low-density road crack sealant in cold weather, different proportions of 90# base asphalt, blending oil, rubber powder, SBS modifier, and stabilizer can be prepared in advance. The operator opens the outer solenoid valve 203, and each material enters a different mixing cylinder 202 under external pressure or gravity (90# base asphalt, blending oil, and rubber powder each enter one mixing cylinder 202, and SBS modifier and stabilizer enter one mixing cylinder 202). At this time, the solenoid valve 203 of the feed window 208 remains closed to prevent material leakage from the mixing component 4 or premature mixing of materials in different cylinders. When the material injection is completed and needs to be pushed into the mixing component 4, the outer solenoid valve 203 closes to cut off the feed path.

[0045] Then, the solenoid valve 203 of the feed window 208 of the blending oil proportioning cylinder 202 is opened, allowing the blending oil to flow through the feed window 208 to the mixing cylinder 401. Heating wires 405 are arranged around the cylinder body in the mounting chamber 404 within the mixing cylinder 401. After the blending oil enters the mixing cylinder 401, the heating wires 405 immediately start heating, and the heat generated is evenly conducted to the material inside the cylinder, heating the material temperature to 75~80℃. The solenoid valve 203 of the feed window 208 of the 90# base asphalt proportioning cylinder 202 is opened, allowing the 90# base asphalt to flow through the feed window 208 to the mixing cylinder 401. Then, the servo motor 406 is activated to control the stirring blades 407 to rotate at 250 rpm, ensuring that the 90# base asphalt is evenly mixed with the heated blending oil. Stirring is performed for 2~4... After 10 minutes, adjust the power of the heating wire 405 to raise the heating temperature to 160-165℃; open the solenoid valve 203 of the feed window 208 of the SBS modifier and stabilizer mixing cylinder 202, allowing the SBS modifier and stabilizer to flow into the mixing cylinder 401 through the feed window 208, and stir for 10-15 minutes to ensure thorough mixing of the materials; then increase the speed of the stirring blade 407 to 400 rpm and raise the heating temperature to 170-175℃, shearing the materials for 50-60 minutes. Under centrifugal force, the materials impact the cavity wall and form vortices, while simultaneously undergoing blade shearing and bottom grinding, further blending the materials; then open the solenoid valve 203 of the feed window 208 of the rubber powder mixing cylinder 202, allowing the rubber powder to flow into the mixing cylinder 401 through the feed window 208. At this time, further increase the heating temperature to 190-200℃ and reduce the speed of the stirring blade 407 to 250 rpm. Mix all materials at rpm to ensure uniform coating of rubber powder; after stirring for 4-5 hours, stop the stirring fan blade 407 and increase the heating temperature to 200-210℃, let it stand for 50-60 minutes to prepare a cold-resistant low-density road crack sealant.

[0046] In addition to preparing crack sealant, this equipment can also perform crack filling operations. During use, the user holds the cylinder 1 and handle 101, opens the valve of the filling head 402, and outputs the prepared crack sealant through the filling head 402. The front end of the filling head 402 is designed with a tapered opening to accommodate road cracks of different widths, ensuring that the sealant penetrates deep into the cracks under pressure, forming a tight filler. Furthermore, if the prepared sealant is stored for an extended period, the heating wire 405 can be turned on to heat the material to above 70°C, and the stirring fan blades 407 can be turned on to a speed of 50 rpm, restoring the material to its optimal state of uniform mixing and slow flow, significantly improving construction efficiency and crack filling quality in cold regions.

[0047] Example 6 The cold-resistant low-density road crack sealant prepared in Examples 1-4 and the crack sealant prepared in Comparative Examples 1-3 were subjected to indoor testing according to JT / T 740-2015 "Road Heated Sealants". All performance indicators met the requirements of the specification. The specific test results are shown in Table 1 below. It can be seen that the cold-resistant low-density road crack sealant prepared in the examples of the present invention meets the requirements of a -40℃ cold-resistant sealant, has strong cold resistance, and low density, resulting in a full crack filling state. In contrast, the products of Comparative Examples 1-3 have inferior low-temperature performance and fluidity compared to Examples 1-4, and have higher density, making them unsuitable for crack filling in cold regions (-40℃).

[0048] Table 1 Performance test results of the sealant in Examples 1-3

[0049] 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 within the protection scope of the present invention.

Claims

1. A low-density road crack sealant for extremely cold conditions, characterized in that, It comprises the following raw materials in parts by weight: 40-45 parts of 90# base asphalt, 27-35 parts of blending oil, 15-25 parts of rubber powder, 3-5 parts of SBS modifier, and 0.1-0.3 parts of stabilizer.

2. The preparation method of the low-density road crack sealant for extreme cold as described in claim 1, characterized in that, It includes the following steps: S1. Prepare the following raw materials in parts by weight: 40-45 parts of 90# base asphalt, 27-35 parts of blending oil, 15-25 parts of rubber powder, 3-5 parts of SBS modifier, and 0.1-0.3 parts of stabilizer. S2. Heat the blended oil, and then stir and mix the heated blended oil with the 90# base asphalt to obtain the first intermediate product; S3. After heating the first intermediate product, add the SBS modifier and the stabilizer, stir and mix well to obtain the second intermediate product. S4. Cut the second intermediate product, then add the rubber powder, stir and mix well to obtain the third intermediate product; S5. The third intermediate product is developed to obtain a cold-resistant, low-density road crack sealant.

3. The method for preparing a low-density road crack sealant for extreme cold conditions according to claim 2, characterized in that, In step S2, the blended oil is heated to 75~80℃; the heated blended oil and the 90# base asphalt are stirred for 2~4 minutes at a stirring speed of 250 rpm.

4. The preparation method of a low-density road crack sealant for extreme cold as described in claim 2, characterized in that, In step S3, the first intermediate product is heated to 160~165℃; the stirring time of the SBS modifier, the stabilizer and the first intermediate product is 10~15 min and the stirring speed is 250 rpm.

5. The preparation method of a low-density road crack sealant for extreme cold as described in claim 2, characterized in that, In step S4, the second intermediate product is sheared at a temperature of 170-175°C, for a time of 50-60 min, and at a speed of 400 rpm; the rubber powder and the second intermediate product are stirred at a temperature of 190-200°C, for a time of 4-5 h, and at a speed of 250 rpm.

6. The method for preparing a low-density road crack sealant for extreme cold conditions according to claim 2, characterized in that, In step S5, the third intermediate product is developed at a temperature of 200-210°C for a development time of 50-60 minutes.

7. A method for preparing a low-density road crack sealant for extreme cold conditions according to any one of claims 2-6, characterized in that, Steps S2, S3, S4, and S5 are completed using an integrated preparation equipment for cold-weather-resistant low-density road crack sealant; the integrated preparation equipment for cold-weather-resistant low-density road crack sealant includes: A grip cylinder, one end of which is fixedly connected to a proportioning component, and the grip cylinder has a built-in driving component. A mixing component is provided at the end of the proportioning component away from the grip cylinder. The proportioning component includes a storage cylinder, one end of which is fixedly connected to the gripping cylinder. The storage cylinder includes multiple proportioning cylinders, which are distributed around the gripping cylinder to form the storage cylinder. A pusher plate is built into the proportioning cylinder. The drive assembly includes multiple push rods, each of which is fixedly connected to multiple push plates. A moving disc is fixedly connected to the end of each push rod away from the push plate. The moving disc is placed inside the grip cylinder and is slidably connected to the inner wall of the grip cylinder around its perimeter. An inclined plate is provided on the side of the moving disc away from the push rods. A positioning rod is provided between the moving disc and the inclined plate. A motor is provided on the side of the inclined plate away from the moving disc. A drive roller is fixedly connected to the output end of the motor. The end of the drive roller away from the motor is fixedly connected to the inclined plate. A fixed seat is sleeved and fixedly fixed on the surface of the motor. The end of the fixed seat away from the motor is fixedly connected to the inner wall of the grip cylinder. The mixing assembly includes a mixing cylinder, inside which a servo motor is installed. A stirring blade is fixedly connected to the output end of the servo motor. A stirring blade is fixedly installed at the tail end of the servo motor and a storage cylinder. A filling head is fixedly connected to the end of the mixing cylinder away from the holding cylinder. An installation chamber is opened inside the wall of the mixing cylinder, and an electric heating wire is installed inside the installation chamber.

8. The preparation method of a low-density road crack sealant for extreme cold as described in claim 7, characterized in that, Multiple proportioning cylinders are evenly distributed around the axis of the gripping cylinder, and the multiple proportioning cylinders are fixedly connected to each other; a solenoid valve is fixedly connected to the side of the proportioning cylinder away from the axis of the gripping cylinder, and a feeding window is opened on the side of the proportioning cylinder near the mixing component, and a solenoid valve is also installed in the feeding window.

9. The preparation method of a low-density road crack sealant for extreme cold as described in claim 8, characterized in that, An assembly ring is fixedly connected to one end of the mixing cylinder near the storage cylinder, and a connecting ring is fixedly connected to one end of the proportioning cylinder near the mixing component. The outer ring wall of the connecting ring and the inner ring wall of the assembly ring are provided with matching threads, and the connecting ring and the assembly ring are threadedly fixed.

10. The method for preparing a low-density road crack sealant for extreme cold conditions according to claim 7, characterized in that, A guide seat is fixedly connected to one side of the motion disc, and a guide groove is provided on the inner wall of the grip cylinder. The guide seat is slidably connected to the groove wall of the guide groove. One end of the positioning rod is fixedly connected to the motion disc, and the other end of the positioning rod is fixedly connected to a motion ball. A sliding ring groove is provided on the surface of the tilting disc. The motion ball is placed in the sliding ring groove and is slidably connected to the inner wall of the sliding ring groove. A limit window is provided on the surface of the tilting disc.

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