A method for preparing a water-based rubber gap filling adhesive

Abstract

This invention relates to the field of road crack sealant technology, and particularly to a method for preparing a water-based rubber crack sealant, comprising: adding water-based tackifying resin, water-based epoxy resin emulsion, coupling agent, and defoamer to SBS modified emulsified asphalt to obtain component A liquid; simultaneously mixing an active curing agent, inorganic filler, and rubber powder to obtain component B powder; after allowing component A liquid to stand, calculating a standing stability index based on the percentage of stratification height, the percentage of bottom sedimentation, and the rate of change in conductivity to determine its compliance; mixing the qualified component A with component B in a specific ratio, monitoring the viscosity rise rate and stringing time during the process to calculate a construction window index; conducting a grouting simulation test on the resulting mixture to obtain the initial paving diameter and the symmetry coefficient of the drop pattern to determine whether it meets the standard; if not, adjusting the preset range of the construction window index or adjusting the stirring speed during the mixing process. This invention improves the stability and grouting compliance rate of the crack sealant.

Description

Technical Field

[0001] This invention relates to the field of road crack sealant technology, and more particularly to a method for preparing a water-based rubber crack sealant. Background Technology

[0002] Road surface cracks are the most common early-stage defects in asphalt concrete and cement concrete pavements. Cracks not only compromise the overall structural strength of the pavement but also create direct channels for rainwater, snowmelt, and debris to seep in. If cracks are not sealed promptly and effectively, moisture infiltration into the base layer will cause more serious structural damage such as pumping, loosening, potholes, and even subgrade settlement, significantly shortening the road's service life and increasing overall life-cycle maintenance costs. Therefore, selecting high-performance crack sealing materials for crack treatment is a crucial aspect of preventative road maintenance.

[0003] Currently, the crack sealing materials widely used both domestically and internationally are mainly divided into three categories. The first category is hot-melt asphalt sealant, which uses petroleum asphalt as a base and requires heating to above 180℃ to a molten state before being injected into cracks. Although this type of material has good adhesion, its construction energy consumption is extremely high. High-temperature heating poses safety hazards such as burns and fires, and repeated heating easily leads to asphalt aging and brittleness, reducing the sealing effect. The second category is solvent-based or reactive cold-applied crack sealant, typically using polyurethane, polysulfide, and other resin systems. This type of material does not require heating but contains a large amount of volatile organic solvents, producing a pungent odor during construction, which is seriously harmful to the environment and the health of construction workers, and is also costly. The third category is ordinary emulsified asphalt crack sealing materials. Although they use water as a solvent and are environmentally friendly, their solid content is generally low, resulting in large volume shrinkage after drying, weak adhesion, and poor elastic recovery performance. They are unable to adapt to the expansion and shear deformation of the road surface under temperature changes and vehicle loads, often leading to secondary cracking or detachment within a short period.

[0004] In response to the aforementioned technological shortcomings, the market urgently needs to develop a new type of crack sealing material that balances environmental performance with excellent mechanical properties. An ideal material should be suitable for application at room temperature, have high solids content, strong adhesion, high elastic recovery rate, and the ability to allow for rapid traffic flow, thus balancing maintenance quality, construction efficiency, and environmental requirements. Summary of the Invention

[0005] Therefore, the present invention provides a method for preparing water-based rubber sealant to overcome the problem of poor grouting adaptability caused by the lack of consideration for the quantitative determination of liquid stability and dynamic control of the construction window in the prior art.

[0006] To achieve the above objectives, the present invention provides a method for preparing a water-based rubber sealant, comprising: Step S1: Heat the base asphalt to a preset temperature, add SBS modifier while stirring, and obtain SBS modified asphalt by high-speed shearing. Then, send the SBS modified asphalt and soap solution containing emulsifier into a colloid mill for emulsification. After cooling, obtain SBS modified emulsified asphalt. Step S2: Water-based tackifying resin, water-based epoxy resin emulsion, coupling agent and defoamer are added sequentially to the SBS modified emulsified asphalt, and mixed for a first preset time under stirring to obtain component A liquid; at the same time, active curing agent, inorganic filler and rubber powder are mixed in a dry powder mixer for a second preset time to obtain component B powder. Step S3: Let the prepared component A liquid stand for a preset time, observe and record the percentage of layer height, the percentage of bottom sediment, and the rate of change of conductivity of the upper liquid after standing, so as to calculate the standing stability index, and determine the qualification of component A based on the standing stability index; if it is unqualified, determine whether demulsification has occurred based on the sharpness of the surface reflection spot of the upper liquid, and determine the adjustment method or discard and reprocess based on the state of bottom sediment. Step S4: Mix the prepared qualified A component liquid and B component powder according to a preset weight ratio and stir for a third preset time. During the mixing process, monitor the viscosity rise rate and string breakage time of the mixture in real time to calculate the construction window index of the mixture, and dynamically adjust the stirring speed to control the construction window index within a preset range to obtain the water-based rubber grouting adhesive mixture. Step S5: Perform a grouting simulation test on the water-based rubber grouting compound to obtain the initial spreading diameter and the symmetry coefficient of the falling shape. Based on the initial spreading diameter and the symmetry coefficient of the falling shape, determine whether the water-based rubber grouting compound meets the preset standard. If it does not meet the standard, adjust the preset range of the construction window index, or adjust the stirring speed in step S4.

[0007] Further, in step S1, by weight, the following components are included: 100 parts of base asphalt, 3-8 parts of SBS modifier, 1-3 parts of emulsifier, and 40-60 parts of water.

[0008] Further, in step S2, by mass, component A liquid material includes: 100 parts of SBS modified emulsified asphalt, 5-15 parts of water-based tackifying resin, 10-25 parts of water-based epoxy resin emulsion, 0.5-2 parts of coupling agent, and 0.1-0.5 parts of defoamer. Component B powder includes: 100 parts of active curing agent, 150-300 parts of inorganic filler, and 50-150 parts of rubber powder.

[0009] Furthermore, in step S3, in response to the static stability index being less than a preset stability threshold, component A is determined to be unqualified, and whether demulsification has occurred is determined based on the sharpness of the surface reflection spot of the upper liquid.

[0010] Furthermore, in step S3, if the sharpness of the reflected light spot is greater than a first preset sharpness threshold, it is determined that the emulsion has not been broken, and the adjustment method is determined based on the bottom sedimentation state. In response to the situation where the sharpness of the reflected light spot is greater than the second preset sharpness threshold and less than or equal to the first preset sharpness threshold, it is determined to be critical demulsification, and emulsifier is added based on the difference between the sharpness of the reflected light spot and the second preset sharpness threshold. If the sharpness of the reflected light spot is less than or equal to the second preset sharpness threshold, it is determined that the emulsion has been broken and the image is discarded and remade directly.

[0011] Furthermore, the adjustment method is determined based on the bottom sedimentation state, wherein, If the sediment at the bottom is soft sediment, add water-based thickening resin. If the bottom precipitate is a hard precipitate, add coupling agent.

[0012] Furthermore, the amount of emulsifier added is positively correlated with the sharpness difference, which is the difference between the sharpness of the reflected light spot and the second preset sharpness threshold.

[0013] Further, in step S5, the process of the injection simulation test is as follows: the water-based rubber grout mixture is taken with a scraper and dripped vertically from a preset height onto a horizontal metal plate. After standing for a preset test time, the maximum diameter after spreading is measured as the initial spreading diameter, and the shortest and longest diameters of the spreading profile are measured. The shortest diameter is divided by the longest diameter to obtain the symmetry coefficient of the falling shape.

[0014] Furthermore, in step S5, if the initial spreading diameter exceeds the preset diameter range, or the symmetry coefficient of the falling pattern is less than the preset symmetry threshold, it is determined that the water-based rubber sealant mixture does not meet the preset standard.

[0015] Furthermore, if the initial paving diameter exceeds the preset diameter range, the preset range of the construction window index is adjusted based on the deviation direction of the initial paving diameter. If the symmetry coefficient of the fall pattern is less than the preset symmetry threshold, the stirring speed in step S4 is adjusted based on the difference between the symmetry coefficient of the fall pattern and the preset symmetry threshold.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This invention achieves a quantitative assessment of the storage stability of component A by collecting data on the percentage of layer height, the percentage of bottom sediment, and the rate of change in the conductivity of the upper layer after the A-component liquid has been allowed to stand, and then calculating a standing stability index. This avoids the subjectivity of relying solely on visual judgment. When the standing stability index fails to meet the requirements, the sharpness of the surface reflected light spot is used to determine whether demulsification has occurred. Based on the hardness of the bottom sediment, thickening resin or coupling agent is added to repair some of the unstable components A, reducing the raw material scrap rate caused by stability issues.

[0017] 2. This invention calculates the construction window index by real-time monitoring of the viscosity rise rate and fiber breakage time, and dynamically adjusts the stirring speed to control the index within a preset range, thus achieving active regulation of the reaction rate during mixing. Compared with existing technologies that use fixed stirring speeds or rely solely on experience, this invention can adjust energy input according to the real-time state of the mixture, maintaining the construction window within a suitable range and improving the construction consistency of mixtures from different batches under different environmental conditions.

[0018] 3. This invention obtains the initial spreading diameter and drop pattern symmetry coefficient through injection simulation testing, which respectively characterize the consistency and uniformity grade of the mixture. When the mixture does not meet the preset standards, the preset range of the construction window index or the stirring speed in step S4 is selectively adjusted according to the direction and magnitude of the deviation of specific parameters, forming a closed-loop feedback mechanism from mixing process control to final state verification, thereby improving the adaptability of on-site injection of the sealant and the finished product qualification rate. Attached Figure Description

[0019] Figure 1 This is a flowchart illustrating the preparation method of the water-based rubber sealant according to an embodiment of the present invention; Figure 2 This is a flowchart illustrating the process of determining the qualification of component A based on the static stability index in an embodiment of the present invention. Figure 3 This is a flowchart illustrating how to determine whether a water-based rubber sealant mixture meets a preset standard, as described in an embodiment of the present invention. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments.

[0021] Those skilled in the art will understand that the method for determining the above-mentioned parameters for a single item in this invention can be as follows: selecting the value with the highest proportion based on the data distribution as the preset standard parameter; using weighted summation to use the obtained value as the preset standard parameter; substituting each historical data into a specific formula and using the value obtained by the formula as the preset standard parameter; or other selection methods, as long as the present invention can clearly define different specific situations in the single item determination process through the obtained values.

[0022] Please see Figure 1 As shown, the preparation method of the water-based rubber sealant in this embodiment of the invention includes: Step S1: Heat the base asphalt to a preset temperature (140-160°C), add SBS modifier while stirring, and obtain SBS modified asphalt by high-speed shearing. Then, send the SBS modified asphalt and soap solution containing emulsifier into a colloid mill for emulsification. After cooling, obtain SBS modified emulsified asphalt. Step S2: Water-based tackifying resin, water-based epoxy resin emulsion, coupling agent and defoamer are added sequentially to the SBS modified emulsified asphalt. The mixture is stirred for a first preset time (10-30 minutes) to obtain component A liquid. At the same time, the active curing agent, inorganic filler and rubber powder are mixed in a dry powder mixer for a second preset time (5-15 minutes) to obtain component B powder. Step S3: Let the prepared component A liquid stand for a preset time, observe and record the percentage of layer height, the percentage of bottom sediment, and the rate of change of conductivity of the upper liquid after standing, so as to calculate the standing stability index, and determine the qualification of component A based on the standing stability index; if it is unqualified, determine whether demulsification has occurred based on the sharpness of the surface reflection spot of the upper liquid, and determine the adjustment method or discard and reprocess based on the state of bottom sediment. Step S4: Mix the prepared qualified component A liquid and component B powder at a preset weight ratio (100:15-25) and stir for a third preset time (2-5 minutes). During the mixing process, monitor the viscosity rise rate and string breakage time of the mixture in real time to calculate the construction window index of the mixture, and dynamically adjust the stirring speed to control the construction window index within the preset range to obtain the water-based rubber grouting adhesive mixture. Step S5: Perform a grouting simulation test on the water-based rubber grouting compound to obtain the initial spreading diameter and the symmetry coefficient of the falling shape. Based on the initial spreading diameter and the symmetry coefficient of the falling shape, determine whether the water-based rubber grouting compound meets the preset standard. If it does not meet the standard, adjust the preset range of the construction window index, or adjust the stirring speed in step S4.

[0023] Specifically, in step S1, by weight, the following components are included: 100 parts of base asphalt, 3-8 parts of SBS modifier, 1-3 parts of emulsifier, and 40-60 parts of water.

[0024] Specifically, in step S2, by mass, component A liquid material includes: 100 parts of SBS modified emulsified asphalt, 5-15 parts of water-based tackifying resin, 10-25 parts of water-based epoxy resin emulsion, 0.5-2 parts of coupling agent, and 0.1-0.5 parts of defoamer. Component B powder includes: 100 parts of active curing agent, 150-300 parts of inorganic filler, and 50-150 parts of rubber powder.

[0025] Specifically, in this embodiment of the invention, the emulsifier is a cationic asphalt emulsifier, the coupling agent is a silane coupling agent (such as KH-550, KH-560), the defoamer is a polyether or organosilicon water-based defoamer, the active curing agent is a modified amine or polyamide epoxy curing agent, the inorganic filler is one or more of calcium carbonate, talc, silica powder or kaolin, and the rubber powder is waste tire rubber powder.

[0026] Please see Figure 2 As shown, in step S3, if the static stability index is less than the preset stability threshold, component A is determined to be unqualified, and whether demulsification has occurred is determined based on the sharpness of the surface reflection spot of the upper liquid. Component A is deemed qualified if the static stability index is greater than or equal to the preset stability threshold. Specifically, the static stability index is determined by the proportion of layer height, the proportion of bottom sediment, and the rate of change of conductivity of the upper liquid. Static stability index = 1 / (1+proportion of layer height) + 1 / (1+proportion of bottom sediment) + 1 / (1+rate of change of conductivity). In this embodiment of the invention, the preset stability threshold is set to 2.7; the preset static time is set to 24 hours. The percentage of stratification height is determined by measuring the ratio of the height of the upper clear liquid to the total liquid level after settling; the percentage of bottom sediment is determined by measuring the ratio of the height of the bottom sediment layer to the total liquid level after settling; and the percentage of change in conductivity is determined by measuring the percentage change in the conductivity of the upper liquid after settling compared to the initial conductivity of component A before settling.

[0027] Understandably, the percentage of stratification height directly reflects the degree of oil-water separation and is a macroscopic characterization of emulsion stability; the percentage of bottom sedimentation reflects the sedimentation and aggregation state of solid particles, distinguishing between physical sedimentation and chemical aggregation failure modes; and the rate of change in conductivity reflects the adsorption state of the emulsifier at the oil-water interface at the microscopic level—an increase indicates emulsifier desorption, while a decrease indicates ions settling with the particles. These three parameters characterize system stability from three dimensions: macroscopic stratification, sedimentation, and microscopic interface. A single parameter may lead to misjudgment; for example, if only the stratification height is high but the conductivity is normal, it may only be reversible stratification due to insufficient viscosity rather than irreversible demulsification. A comprehensive assessment of all three can avoid the limitations of a single indicator and achieve an accurate quantitative evaluation of the stability of component A.

[0028] Specifically, step S3 responds to the fact that the sharpness of the reflected light spot is greater than the first preset sharpness threshold, determines that the emulsion has not been broken, and determines the adjustment method based on the bottom sedimentation state; In response to the situation where the sharpness of the reflected light spot is greater than the second preset sharpness threshold and less than or equal to the first preset sharpness threshold, it is determined to be critical demulsification, and emulsifier is added based on the difference between the sharpness of the reflected light spot and the second preset sharpness threshold. If the sharpness of the reflected light spot is less than or equal to the second preset sharpness threshold, it is determined that the emulsion has been broken and the image is discarded and remade directly. The sharpness of the reflected light spot is quantitatively determined by the following image processing method: A laser pointer is used to illuminate the surface of component A liquid at a 45° angle. A white card is placed 30cm away from the liquid surface on the opposite side. A camera is used to capture an image of the reflected light spot on the white card. The captured image is converted into a grayscale image and filtered to remove noise. A grayscale threshold is set to segment the light spot area. Edge pixels of the light spot area are extracted. The absolute value of the grayscale gradient of the edge pixels is calculated and averaged. The average gradient value is normalized to the range of 0 to 1 to obtain the sharpness of the reflected light spot. The closer the sharpness of the reflected light spot is to 1, the clearer the edge of the light spot; the closer it is to 0, the blurrier the light spot. In this embodiment of the invention, the first preset sharpness threshold is set to 0.7, and the second preset sharpness threshold is set to 0.3.

[0029] It is understandable that an undemulsified A-component liquid surface contains a continuous and complete water film with a smooth and flat surface, which produces specular reflection of the laser beam, forming a sharp spot with clear edges and a large gray-scale gradient. When demulsification occurs, the emulsifier desorbs from the oil-water interface, the oil phase precipitates and forms an extremely thin oil film on the liquid surface. The surface tension of the oil film is lower than that of the water film and its flatness decreases, causing diffuse reflection of the incident laser, resulting in blurred spot edges and a reduced gray-scale gradient. The more severe the demulsification, the lower the spot sharpness until it disappears. Traditional methods usually only determine demulsification when a visible oil layer appears, at which point it is irreversible. However, this invention can identify the critical state at the early stage of demulsification by detecting the early attenuation of spot sharpness. At this time, adding emulsifier still has a high success rate to achieve repair, avoiding the waste of raw materials caused by direct discarding. At the same time, the image processing quantifies the sharpness value, eliminating the subjective difference of human visual inspection and improving the repeatability and accuracy of the judgment.

[0030] Specifically, the adjustment method is determined based on the bottom sedimentation state, among which... If the sediment at the bottom is soft sediment, add water-based thickening resin. If the bottom precipitate is a hard precipitate, add coupling agent; The softness or hardness of the bottom sediment is determined by the following method: a glass rod is inserted vertically into the bottom of the A component liquid and the sediment layer is gently pressed. If the sediment layer is soft, the sediment is easily deformed after being pressed by the glass rod, and can be redispersed after stirring, it is determined to be soft sediment. If the sediment layer is hard, a granular feeling or blocky resistance is produced when the glass rod is pressed, and it is granular and cannot be dispersed after stirring, it is determined to be hard sediment.

[0031] Specifically, when the bottom sediment ratio exceeds 3%, replenishment is initiated. For every 1 percentage point increase in sediment ratio, the amount of water-based tackifying resin or coupling agent added is 0.2% to 0.5% of the total mass of component A liquid. After replenishment, stir for 5 to 10 minutes and retest the bottom sediment ratio. If it is still greater than 3%, replenish again in the same proportion. If it is still unqualified after the second replenishment, discard and reprocess.

[0032] Understandably, soft precipitates are formed due to insufficient viscosity of component A liquid, causing solid particles to settle naturally under gravity without irreversible agglomeration. By adding water-based thickening resin to increase the viscosity of the continuous phase, the suspension capacity of the solid particles is enhanced, and the precipitate can be redispersed after stirring. Hard precipitates are formed due to insufficient or ineffective coupling agent, resulting in poor wettability of the particle surface and irreversible chemical agglomeration. It is necessary to add coupling agent to improve the interfacial bonding force between the particles and the liquid phase and break up the formed hard agglomerates.

[0033] Specifically, the amount of emulsifier added is positively correlated with the sharpness difference, which is the difference between the sharpness of the reflected light spot and the second preset sharpness threshold. Emulsifier addition amount = baseline addition amount × (sharpness difference / second preset sharpness threshold), where the baseline addition amount is 0.5% to 1.0% of the total mass of component A liquid.

[0034] Specifically, the process of the injection simulation test is as follows: the water-based rubber grout mixture is taken with a scraper and dripped vertically from a preset height onto a horizontal metal plate. After standing for a preset test time, the maximum diameter after spreading is measured as the initial spreading diameter, and the shortest and longest diameters of the spreading profile are measured. The symmetry coefficient of the falling shape = shortest diameter / longest diameter.

[0035] Please see Figure 3 As shown, step S5 responds to the initial spreading diameter exceeding the preset diameter range, or the symmetry coefficient of the falling pattern being less than the preset symmetry threshold, by determining that the water-based rubber sealant mixture does not meet the preset standard. If the initial spreading diameter is within the preset diameter range and the symmetry coefficient of the falling pattern is greater than or equal to the preset symmetry threshold, it is determined that the water-based rubber sealant mixture meets the preset standard. In this embodiment of the invention, the preset diameter range is 5cm-10cm, and the preset symmetry threshold is 0.8.

[0036] Specifically, if the initial spreading diameter exceeds the preset diameter range, the preset range of the construction window index is adjusted based on the deviation direction of the initial spreading diameter. If the symmetry coefficient of the fall pattern is less than the preset symmetry threshold, the stirring speed in step S4 is adjusted based on the difference between the symmetry coefficient of the fall pattern and the preset symmetry threshold.

[0037] Specifically, the construction window index = wire breakage time / viscosity rise rate; The viscosity rise rate was measured in real time using the stirring power method. Ten seconds after components A and B were mixed and timing began, the initial power value of the stirring motor was recorded as the corresponding reference viscosity value. The instantaneous power of the stirring motor was collected in real time via a frequency converter. The viscosity rise rate was calculated as: (instantaneous power - initial power) / time elapsed since the reference time. The wire breaking time was determined using the standard wire drawing rod method. During the mixing process, the mixing was paused every 30 seconds. A stainless steel wire drawing rod with a diameter of 6-8 mm was vertically inserted into the liquid mixture about 50 mm below the surface of the liquid. After holding the rod for 2 seconds, it was lifted vertically upwards at a constant speed. The liquid filament formed between the lower end of the wire drawing rod and the surface of the liquid mixture was observed. The time elapsed from the start of the wire drawing rod's ascent to the complete breakage of the liquid filament was recorded as the wire breaking time, in seconds. In this embodiment of the invention, the preset range of the construction window index is 1.5 to 4.0. When the construction window index is lower than 1.5, it is determined that the window is too narrow and the stirring speed needs to be reduced to slow down the reaction rate. When the construction window index is higher than 4.0, it is determined that the window is too wide and the stirring speed needs to be increased to accelerate the reaction. When the construction window index is in the range of 1.5 to 4.0, it is determined to be a qualified window, and the current stirring speed is maintained until the water-based rubber grouting compound is obtained.

[0038] Specifically, when the initial spreading diameter is less than 5cm, the preset range is adjusted to 2.0-4.5 to allow for a higher construction window index, thereby obtaining a mixture with better flowability; When the initial spreading diameter is greater than 10cm, the preset range is adjusted to 1.0-3.5 to limit the construction window index from being too high and to avoid the mixture from flowing or segregating after pouring.

[0039] Specifically, if the symmetry difference is greater than or equal to the preset difference threshold, the stirring speed is set to the product of the reference stirring speed and the first speed coefficient. If the symmetry difference is less than the preset difference threshold, the stirring speed is set to the product of the reference stirring speed and the second speed coefficient. The symmetry difference is the difference between the fall pattern symmetry coefficient and the preset symmetry threshold. The value of the preset difference threshold can be determined by the user based on the construction accuracy requirements of the grout, the tolerance for mixing uniformity, and the requirements for consistent grouting quality. The symmetrical difference effectively reflects the degree of unevenness of the mixture and the overall effect of stirring and dispersion. The greater the user's requirements for grouting quality and crack filling integrity, the smaller the value of the preset difference threshold. In this embodiment, the preset difference threshold is 0.15. The first speed coefficient is greater than the second speed coefficient. In this embodiment, the preferred value ranges for the first speed coefficient and the second speed coefficient are [1.2, 2.0] and [1.0, 1.5], respectively. The first speed coefficient is 1.5 and the second speed coefficient is 1.2. The reference stirring speed is the current stirring speed maintained in step S4 when the construction window index is within the preset range.

[0040] Example 1 In this embodiment, the water-based rubber sealant is composed of the following raw materials in parts by weight: Component A liquid: SBS modified emulsified asphalt: 100 parts, water-based tackifying resin: 5 parts, water-based epoxy resin emulsion: 10 parts, coupling agent: 0.5 parts, defoamer: 0.1 parts; Component B powder: active curing agent: 100 parts, inorganic filler: 150 parts, rubber powder: 50 parts; The weight ratio of component A to component B is 100:20. The preparation method used is as follows: Step S1: Heat the base asphalt to 140°C, add SBS modifier (3 parts / 100 parts asphalt) while stirring, and obtain SBS modified asphalt by high-speed shearing (3000 rpm, 20 minutes). The SBS modified asphalt and soap solution (40 parts water / 100 parts asphalt) containing emulsifier (1 part / 100 parts asphalt) are fed into a colloid mill for emulsification. After cooling, SBS modified emulsified asphalt is obtained.

[0041] In step S2, 5 parts of water-based tackifying resin, 10 parts of water-based epoxy resin emulsion, 0.5 parts of coupling agent, and 0.1 parts of defoamer are added sequentially to 100 parts of SBS modified emulsified asphalt. The mixture is stirred for 10 minutes (stirring speed 200 rpm) to obtain component A liquid. At the same time, 100 parts of active curing agent, 150 parts of inorganic filler, and 50 parts of rubber powder are mixed in a dry powder mixer for 5 minutes (speed 100 rpm) to obtain component B powder.

[0042] Step S3: Let the liquid component A stand for 24 hours. The stratification height ratio is 8%, the bottom sediment ratio is 5%, the conductivity change rate is 12%, and the standing stability index is calculated to be 2.77, which is greater than the preset stability threshold of 2.7. Therefore, component A is deemed qualified.

[0043] Step S4: Mix component A liquid and component B powder at a weight ratio of 100:20 and stir for 2 minutes. During the mixing process, the viscosity rise rate was measured to be 0.12 kW / s, the string breakage time was 0.3 seconds, and the calculated construction window index was 2.5, which is within the preset range of 1.5 to 4.0. Maintain the stirring speed (200 rpm) to obtain the water-based rubber sealant mixture.

[0044] Step S5: Perform a pouring simulation test on the mixture: drop it vertically from a height of 40cm onto a horizontal metal plate, let it stand for 45 seconds and then measure the initial spreading diameter, which is 4.2cm (less than 5cm), and the symmetry coefficient of the falling pattern is 0.85 (greater than 0.8).

[0045] In this embodiment, the initial spreading diameter exceeds the lower limit of the preset diameter range and does not meet the preset standard. Therefore, the preset range of the construction window index is adjusted from 1.5 to 4.0 to 2.0 to 4.5.

[0046] Example 2 In this embodiment, the water-based rubber sealant is composed of the following raw materials in parts by weight: Component A liquid: SBS modified emulsified asphalt: 100 parts, water-based tackifying resin: 5 parts, water-based epoxy resin emulsion: 10 parts, coupling agent: 0.5 parts, defoamer: 0.1 parts; Component B powder: active curing agent: 100 parts, inorganic filler: 150 parts, rubber powder: 50 parts; The weight ratio of component A to component B is 100:20.

[0047] Preparation method used: Step S1: Heat the base asphalt to 140°C, add SBS modifier (3 parts / 100 parts asphalt) while stirring, and obtain SBS modified asphalt by high-speed shearing (3000 rpm, 20 minutes). The SBS modified asphalt and soap solution (40 parts water / 100 parts asphalt) containing emulsifier (1 part / 100 parts asphalt) are fed into a colloid mill for emulsification. After cooling, SBS modified emulsified asphalt is obtained.

[0048] In step S2, 5 parts of water-based tackifying resin, 10 parts of water-based epoxy resin emulsion, 0.5 parts of coupling agent, and 0.1 parts of defoamer are added sequentially to 100 parts of SBS modified emulsified asphalt. The mixture is stirred for 10 minutes (stirring speed 200 rpm) to obtain component A liquid. At the same time, 100 parts of active curing agent, 150 parts of inorganic filler, and 50 parts of rubber powder are mixed in a dry powder mixer for 5 minutes (speed 100 rpm) to obtain component B powder.

[0049] Step S3: Let the liquid component A stand for 24 hours. The stratification height ratio is 8%, the bottom sediment ratio is 5%, the conductivity change rate is 12%, and the standing stability index is calculated to be 2.77, which is greater than the preset stability threshold of 2.7. Therefore, component A is deemed qualified.

[0050] Step S4: Mix component A liquid and component B powder at a weight ratio of 100:20 and stir for 3 minutes. During the mixing process, based on the adjustment results of Example 1, the preset range of the construction window index was adjusted from 1.5–4.0 to 2.0–4.5, and the stirring speed was dynamically adjusted to control the construction window index within this range. The viscosity rise rate was measured to be 0.10 kW / s, the string breakage time was 0.45 seconds, and the calculated construction window index was 4.5, which is within the preset range of 2.0–4.5, thus obtaining the water-based rubber sealant mixture.

[0051] Step S5: Perform a pouring simulation test on the mixture: drop it vertically from a height of 40cm onto a horizontal metal plate, and measure it after standing for 45 seconds. The initial spreading diameter is 6.8cm (within the range of 5-10cm), and the symmetry coefficient of the falling pattern is 0.92 (greater than 0.8).

[0052] In this embodiment, the initial spreading diameter is within the preset diameter range, and the symmetry coefficient of the falling pattern is 0.92, which is greater than the preset symmetry threshold of 0.8. Therefore, the water-based rubber sealant mixture is determined to meet the preset standard.

[0053] Example 3 In this embodiment, the water-based rubber sealant is composed of the following raw materials in parts by weight: Component A liquid: SBS modified emulsified asphalt: 100 parts, water-based tackifying resin: 5 parts, water-based epoxy resin emulsion: 10 parts, coupling agent: 0.5 parts, defoamer: 0.1 parts; Component B powder: active curing agent: 100 parts, inorganic filler: 150 parts, rubber powder: 50 parts; The weight ratio of component A to component B is 100:25.

[0054] Preparation method used: Step S1: Heat the base asphalt to 140°C, add SBS modifier (3 parts / 100 parts asphalt) while stirring, and obtain SBS modified asphalt by high-speed shearing (3000 rpm, 20 minutes). The SBS modified asphalt and soap solution (40 parts water / 100 parts asphalt) containing emulsifier (1 part / 100 parts asphalt) are fed into a colloid mill for emulsification. After cooling, SBS modified emulsified asphalt is obtained.

[0055] In step S2, 5 parts of water-based tackifying resin, 10 parts of water-based epoxy resin emulsion, 0.5 parts of coupling agent, and 0.1 parts of defoamer are added sequentially to 100 parts of SBS modified emulsified asphalt. The mixture is stirred for 10 minutes (stirring speed 200 rpm) to obtain component A liquid. At the same time, 100 parts of active curing agent, 150 parts of inorganic filler, and 50 parts of rubber powder are mixed in a dry powder mixer for 5 minutes (speed 100 rpm) to obtain component B powder.

[0056] Step S3: Let the liquid component A stand for 24 hours. The stratification height ratio is 8%, the bottom sediment ratio is 5%, the conductivity change rate is 12%, and the standing stability index is calculated to be 2.77, which is greater than the preset stability threshold of 2.7. Therefore, component A is deemed qualified.

[0057] Step S4: Mix component A (liquid) and component B (powder) at a weight ratio of 100:25 and stir for 3 minutes. During the mixing process, use the same construction window index preset range as in Example 2 (2.0–4.5), and dynamically adjust the stirring speed to control the construction window index within this range. The viscosity rise rate was measured to be 0.13 kW / s, the string breakage time was 0.38 seconds, and the calculated construction window index was 2.92, which is within the preset range of 2.0–4.5, thus obtaining the water-based rubber sealant mixture.

[0058] Step S5: Perform a pouring simulation test on the mixture: drop it vertically from a height of 40cm onto a horizontal metal plate, and measure it after standing for 45 seconds. The initial spreading diameter is 5.6cm (within the range of 5 to 10cm), and the symmetry coefficient of the falling pattern is 0.79 (less than 0.8).

[0059] In this embodiment, the symmetry coefficient of the falling pattern is 0.79, which is less than the preset symmetry threshold of 0.8, and does not meet the preset standard. The symmetry difference is 0.8-0.79=0.01, which is less than the preset difference threshold of 0.15. The stirring speed is set to the product of the baseline stirring speed (200 rpm) and the second speed coefficient 1.2, i.e., increased to 240 rpm, to enhance the mixing uniformity. After adjustment and retesting, the symmetry coefficient increased to 0.81, barely meeting the qualified standard, but the initial spreading diameter decreased to 5.2 cm, and the overall performance was still not as good as in Example 2.

[0060] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the invention (including the claims) is limited to these examples; within the framework of the invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in the details for the sake of brevity.

[0061] This invention is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A method for preparing a water-based rubber sealant, characterized in that, include: Step S1: Heat the base asphalt to a preset temperature, add SBS modifier while stirring, and obtain SBS modified asphalt by high-speed shearing. Then, send the SBS modified asphalt and soap solution containing emulsifier into a colloid mill for emulsification. After cooling, obtain SBS modified emulsified asphalt. Step S2: Water-based tackifying resin, water-based epoxy resin emulsion, coupling agent and defoamer are added sequentially to the SBS modified emulsified asphalt, and mixed for a first preset time under stirring to obtain component A liquid; at the same time, active curing agent, inorganic filler and rubber powder are mixed in a dry powder mixer for a second preset time to obtain component B powder. Step S3: Let the prepared component A liquid stand for a preset time, observe and record the percentage of layer height, the percentage of bottom sediment, and the rate of change of conductivity of the upper liquid after standing, so as to calculate the standing stability index, and determine the qualification of component A based on the standing stability index; if it is unqualified, determine whether demulsification has occurred based on the sharpness of the surface reflection spot of the upper liquid, and determine the adjustment method or discard and reprocess based on the state of bottom sediment. Step S4: Mix the prepared qualified A component liquid and B component powder according to a preset weight ratio and stir for a third preset time. During the mixing process, monitor the viscosity rise rate and string breakage time of the mixture in real time to calculate the construction window index of the mixture, and dynamically adjust the stirring speed to control the construction window index within a preset range to obtain the water-based rubber grouting adhesive mixture. Step S5: Perform a grouting simulation test on the water-based rubber grouting compound to obtain the initial spreading diameter and the symmetry coefficient of the falling shape. Based on the initial spreading diameter and the symmetry coefficient of the falling shape, determine whether the water-based rubber grouting compound meets the preset standard. If it does not meet the standard, adjust the preset range of the construction window index, or adjust the stirring speed in step S4.

2. The method for preparing the water-based rubber sealant according to claim 1, characterized in that, In step S1, by weight, the following are included: 100 parts of base asphalt, 3-8 parts of SBS modifier, 1-3 parts of emulsifier, and 40-60 parts of water.

3. The method for preparing the water-based rubber sealant according to claim 2, characterized in that, In step S2, by mass, component A liquid material includes: 100 parts of SBS modified emulsified asphalt, 5-15 parts of water-based tackifying resin, 10-25 parts of water-based epoxy resin emulsion, 0.5-2 parts of coupling agent, and 0.1-0.5 parts of defoamer. Component B powder includes: 100 parts of active curing agent, 150-300 parts of inorganic filler, and 50-150 parts of rubber powder.

4. The method for preparing the water-based rubber sealant according to claim 3, characterized in that, In step S3, in response to the static stability index being less than the preset stability threshold, component A is determined to be unqualified, and whether demulsification has occurred is determined based on the sharpness of the surface reflection spot of the upper liquid.

5. The method for preparing the water-based rubber sealant according to claim 4, characterized in that, In step S3, if the sharpness of the reflected light spot is greater than the first preset sharpness threshold, it is determined that the emulsion has not been broken, and the adjustment method is determined based on the bottom sedimentation state. In response to the situation where the sharpness of the reflected light spot is greater than the second preset sharpness threshold and less than or equal to the first preset sharpness threshold, it is determined to be critical demulsification, and emulsifier is added based on the difference between the sharpness of the reflected light spot and the second preset sharpness threshold. If the sharpness of the reflected light spot is less than or equal to the second preset sharpness threshold, it is determined that the emulsion has been broken and the image is discarded and remade directly.

6. The method for preparing the water-based rubber sealant according to claim 5, characterized in that, The adjustment method is determined based on the bottom sedimentation state, among which... If the sediment at the bottom is soft sediment, add water-based thickening resin. If the bottom precipitate is a hard precipitate, add coupling agent.

7. The method for preparing the water-based rubber sealant according to claim 6, characterized in that, The amount of emulsifier added is positively correlated with the sharpness difference, which is the difference between the sharpness of the reflected light spot and the second preset sharpness threshold.

8. The method for preparing the water-based rubber sealant according to claim 7, characterized in that, In step S5, the process of injection simulation test is as follows: use a scraper to take water-based rubber grout mixture and drop it vertically from a preset height onto a horizontal metal plate. After standing for a preset test time, measure the maximum diameter after spreading as the initial spreading diameter, and measure the shortest and longest diameters of the spreading profile. Divide the shortest diameter by the longest diameter to obtain the symmetry coefficient of the falling shape.

9. The method for preparing the water-based rubber sealant according to claim 8, characterized in that, Step S5 responds to the initial spreading diameter exceeding the preset diameter range, or the symmetry coefficient of the falling pattern being less than the preset symmetry threshold, by determining that the water-based rubber grouting compound does not meet the preset standard.

10. The method for preparing the water-based rubber sealant according to claim 9, characterized in that, If the initial spreading diameter exceeds the preset diameter range, the preset range of the construction window index will be adjusted based on the deviation direction of the initial spreading diameter. If the symmetry coefficient of the fall pattern is less than the preset symmetry threshold, the stirring speed in step S4 is adjusted based on the difference between the symmetry coefficient of the fall pattern and the preset symmetry threshold.

Images