A road sealant for expansion joints and a construction method thereof

Abstract

The present application belongs to the technical field of road sealing material, and particularly relates to a road sealing glue for expansion joint and a construction method thereof. In view of the defects of poor vibration and noise reduction effect, insufficient durability, frequent maintenance and the like of the existing road expansion joint, the present application provides a road sealing glue for expansion joint, which comprises component A and component B. The effect of normal temperature cross-linking is realized by using hydroxyl modified polyether polyol and amine chain extender. After the raw materials are mixed, self-curing can be realized without heating and without adding pre-coated primer, thereby effectively reducing the construction difficulty of the sealing glue. Through detection, the sealing glue after curing can maintain good elasticity and bonding effect without frequent maintenance, realizes the effect of vibration and noise reduction, and is beneficial to the service time of the road.

Description

Technical Field

[0001] This invention belongs to the field of road sealing materials technology, specifically relating to a road sealant for expansion joints and its construction method. Background Technology

[0002] The information disclosed in this background section is intended only to enhance understanding of the overall background of the invention and is not necessarily to be construed as an admission or in any way implying that such information constitutes prior art known to those skilled in the art.

[0003] Seamless expansion joints use elastic materials to fill the gaps, forming a seamless integral pavement with the road surface. They offer advantages such as low impact, low noise, and improved driving comfort. However, they have disadvantages including high material requirements, short elastomer lifespan, and limited deformation, making them suitable only for bridges with very small spans. To achieve a better balance between stiffness and flexibility, high-damping rubber or polyurethane elastomers are embedded in the rigid steel frame. This ensures that the overall stiffness meets load-bearing requirements while utilizing the flexibility of the elastic material to absorb impact energy, attenuate vibration transmission, and compensate for shortcomings in the processing of the supporting steel plate, reducing unevenness caused by thermal deformation.

[0004] However, existing expansion joint sealants still have the following shortcomings: (1) Traditional expansion joints have poor vibration and noise reduction effects: Through new structural design and the application of high-performance materials, the vibration and noise generated by expansion joints when vehicles pass through can be effectively reduced, improving driving comfort and the quality of the surrounding environment.

[0005] (2) Insufficient durability of expansion joints and frequent maintenance: Develop materials and structures that are resistant to aging, high and low temperatures and wear, and combine them with effective sealing and waterproofing technology to extend the service life of expansion joints, reduce the frequency of maintenance, and achieve the goal of maintenance-free operation.

[0006] (3) Complex construction process and difficult quality control: Develop a simple and efficient construction process and strict quality control measures to ensure stable and reliable construction quality of expansion joints and reduce construction difficulty and cost.

[0007] To address the aforementioned shortcomings, the development of high-performance elastic materials suitable for expansion joints is of great significance for meeting the requirements of vibration reduction, noise reduction, and long-term maintenance-free operation. Summary of the Invention

[0008] To achieve the above-mentioned technical objectives, the present invention provides a road sealant for expansion joints, which achieves room temperature cross-linking through hydroxyl-modified polyether polyol and amine chain extender, and can bond well to metal or concrete materials without primer. It maintains good elasticity without maintenance after construction and has the effect of shock absorption and noise reduction.

[0009] Based on the above-mentioned technical effects, the present invention provides the following technical solution: In a first aspect, a road sealant for expansion joints is provided, the sealant comprising component A and component B, wherein component A is composed of the following components in parts by weight: 55-65 parts hydroxyl-modified polyether polyol, 8-10 parts toluene diisocyanate, 5-8 parts polymethyl methacrylate (PMMA) micro powder, 3-5 parts noise reduction material, 16-20 parts filler material, 0.3-0.5 parts sunscreen agent, 0.2-0.3 parts antioxidant agent, 0.1-0.2 parts defoamer and 3-5 parts solvent; Component B consists of the following components in parts by weight: 6-8 parts diethylenetriamine (DETA), 10-12 parts polyetheramine, 3-5 parts hydroxyethyl methacrylate (HEMA), 1-2 parts thickener, 0.1-0.2 parts mildew inhibitor and 0.5-1.0 parts coupling agent.

[0010] The aforementioned sealant utilizes hydroxyl-modified polyether polyols and amine chain extenders to achieve room-temperature cross-linking. After mixing, the raw materials can cure automatically without heating or the addition of a pre-applied primer. Furthermore, since the sealant fills the steel groove of the telescopic device, the addition of hydroxyl-modified polyether and methacrylate monomers ensures good adhesion and bonding to the metal surface, preventing peeling during service. The sealant also maintains good elasticity, thus reducing the impact of vehicles passing by.

[0011] Component A described above also has the following preferred embodiments: The hydroxyl-modified polyether polyol is preferably a blend of difunctional PPG and trifunctional highly active polyether.

[0012] In one feasible implementation, 40-45 parts of hydroxyl-terminated polyether polyol and 15-20 parts of hydroxyl-modified polyether polyol are used in combination.

[0013] In this embodiment, a polyether diol with a functionality of 2 is preferred as the flexible main chain for hydroxyl-terminated polyether polyols, which helps to ensure the elongation and deformation resistance of the sealant. Specific models include PPG-1000, PPG-2000, PPG-3000, H220M (Red Poly) or EMEROX® 14511.

[0014] In the above embodiments, the hydroxyl-modified polyether polyol is preferably a highly active polyether triol with a functionality of 3, which is beneficial to improving crosslinking and adhesion effects; specific models include 330N, F330N, G330 or HSH-310.

[0015] The noise reduction material is preferably a material with a certain degree of elasticity or a loose porous structure, and has good compatibility and weather resistance. Further, it is selected from elastic or porous materials, such as one or a combination of several of the elastic materials, such as nitrile rubber powder, butyl rubber powder, and thermoplastic elastomers, and one or a combination of several of the porous materials, such as hollow glass microspheres, expanded perlite powder, or porous polyurethane microspheres.

[0016] The filler material includes organic fillers and inorganic fillers, and further comprises 6-8 parts of nitrile rubber powder (particle size 100-200 mesh) and 10-12 parts of nano calcium carbonate.

[0017] The sunscreen agent is selected from UVA / UVB absorbing or ultraviolet quenching agents. The UVA / UVB absorbing agents include, but are not limited to, one or more of UV-327, UV-326, UV-328, UV-531, UV-284, or UV-1577. The ultraviolet quenching agents are selected from, or more of Tinuvin 770, Tinuvin 622, and Chimassorb 944.

[0018] Antioxidants, specifically hindered phenolic antioxidants, including but not limited to antioxidant 1010 or antioxidant 1076.

[0019] The selection of the aforementioned sunscreen and antioxidant can be based on conventional methods according to the UV intensity and temperature conditions of the construction area: In some feasible implementations, the sunscreen is a combination of UV-327 and Tinuvin 770, and the antioxidant is antioxidant 1010; in other feasible implementations, the sunscreen is UV-327, and the antioxidant is antioxidant 1010; in yet another feasible implementation, the sunscreen is a combination of UV-1577 and Chimassorb 944, and the antioxidant is antioxidant 1076.

[0020] The defoamer is preferably an organosilicon defoamer, including but not limited to one or a combination of several of BYK-024, Tego Foamex 810, Dow Corning DC-1410, and Deqian 6800.

[0021] The solvent is a mixture of ethyl acetate and toluene in a ratio of 1:1 (v / v).

[0022] The preparation method of component A is as follows: hydroxyl-modified polyether polyol is added to a reaction vessel and dehydrated under vacuum at 100~110℃ for 2~3 hours. After cooling to 40~60℃, toluene diisocyanate is slowly added, and the temperature is raised to 70~80℃ for 3~4 hours to obtain polyurethane prepolymer. After cooling to 40~60℃, polymethyl methacrylate (PMMA) micro powder, noise reduction material and filler are added in sequence and mixed at high speed. Sunscreen agent, antioxidant, defoamer and solvent are added, and the mixture is stirred at low speed, defoamed and sealed for storage.

[0023] Furthermore, the parameters for the high-speed stirring are as follows: 1200~1700 r / min for 20~40 min; the parameters for the low-speed stirring are as follows: 400~600 r / min for 10~20 min.

[0024] Component B described above also has the following preferred embodiments; Polyetheramine is an amine chain extender with amine end groups. It cures quickly at room temperature and is further classified as one or a combination of several of D-230, D-400, and T-403.

[0025] Thickeners are preferably inorganic minerals, including but not limited to one or a combination of several of fumed silica, organobentonite, magnesium aluminosilicate, and montmorillonite.

[0026] The antifungal agent is preferably an isothiazolinone derivative, and more preferably, a combination of one or more of benzoisothiazolinone, octylisothiazolinone, and dichlorooctylisothiazolinone.

[0027] The coupling agent is preferably an aminosilane, specifically, one or a combination of several of KH-540, KH-550, KH-792, and KH-602.

[0028] The preparation method of the components is as follows: Diethylenetriamine and polyetheramine are added to a mixing vessel and stirred evenly at room temperature; hydroxyethyl methacrylate, thickener, mildew inhibitor and coupling agent are added in sequence, stirred evenly and degassed, and then sealed and stored.

[0029] The road sealant described in the first aspect is mainly used for filling gaps in structural joints of steel or concrete structures, joints or cracks in pavements, cracks in asphalt concrete pavements, and other areas requiring waterproofing and water-stopping; more preferably, it is used in any of the following: (1) Sealing and filling of expansion joints in cement concrete pavement; (2) Sealing and filling cracks in asphalt concrete pavement; (3) Waterproofing, waterproofing, or sealing of structural joints in concrete structures; (4) Waterproofing, water-stopping, and sealing of structural joints in highway, railway, and subway engineering projects such as tunnels, bridges, bosses, and ballastless tracks; (5) Sealing of joints in concrete or steel structures with irregular widths during maintenance work; (6) Repair of rubber waterstops for bridge expansion joints; (7) Water-stopping filling between steel sections of modular bridge expansion joints; Secondly, a method for applying the road sealant described in the first aspect is provided, comprising the following steps: S1: Clean the filling groove of the expansion joint to be constructed until the part to be bonded in the filling groove is fully exposed, free of coating, dust and debris; S2: Mix component A and component B thoroughly and then inject the mixture into the filling tank. The upper surface of the colloid should be 1-3 mm below the edge of the filling tank. S3: Curing is achieved by natural curing of the film for 2-6 hours.

[0030] In the above construction method, S1 and S2 are not specified in the order of execution. Those skilled in the art can choose to execute S1 or S2 according to the actual construction needs.

[0031] In step S1 above, since the sealant can be cured at room temperature, it is recommended that the construction personnel estimate the amount of material to be used and determine the dosage of the material to be mixed each time. The mixed material should be applied within 20 to 30 minutes.

[0032] In step S2 above, the cleaning method for the filling groove includes manual or electric mechanical grinding. For expansion joints made of steel, rust, coatings, dust, and debris on the metal surface must be completely removed. For expansion joints made of concrete or asphalt, surface coatings, dust, and debris must be thoroughly removed.

[0033] In some implementations, for deeper filling grooves, PE foam rods or foam boards are placed first as a bottom mold before the mixed material is injected.

[0034] Compared with the prior art, the beneficial effects of the present invention are: First, the road sealant provided by this invention possesses excellent adhesion, bonding tightly to substrates such as concrete and steel without the need for primer, forming a reliable sealed and waterproof structure. After construction, it effectively prevents rainwater and snowmelt from seeping into the expansion joint, avoiding corrosion of the reinforcing steel in the expansion joint structure by moisture. It also prevents the accumulation of mud and sand and the jamming of joints by gravel, reducing damage to the expansion joints caused by debris accumulation, protecting the expansion joint device and the main structure of roads and bridges, and extending their service life.

[0035] Secondly, the sealant also has good shock absorption and noise reduction effects: the sealant adheres well to the expansion joint, and the surface of the sealant is lower than the plane of the expansion joint, so the tire will not come into frictional contact with the sealant surface, avoiding the noise caused by friction in traditional expansion joints. At the same time, the elasticity of the sealant can absorb the impact energy when the vehicle passes, reduce vibration transmission, significantly reduce driving noise, and improve the quality of the surrounding environment.

[0036] Furthermore, the sealant requires no maintenance during its service life, and subsequent observations show that it exhibits virtually no delamination, peeling, or deformation, maintaining good elasticity even after long-term use. Attached Figure Description

[0037] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0038] Figure 1 A clear schematic diagram of the telescopic device described in Embodiment 5; Figure 1 A in the diagram is a front view of the telescopic device. Figure 1 Drawing B in the diagram is the construction drawing for the high-pressure air blowing expansion joint. Figure 2 This is a schematic diagram of the adhesive injection process for the expansion joint described in Example 5; Figure 2 A is a schematic diagram of the main structure of the expansion joint. In the diagram, A1 is the gap between the steel sections, A2 is the injected colloid, A3 is the rubber waterstop, and A4 is the PE foam board. Figure 1 Image B shows the construction effect of using PE foam board as the bottom formwork for the expansion joint; Figure 3 This is a construction drawing of the adhesive injection process for the telescopic device in Example 5; Figure 3 In step A, the prepared sealant material is slowly poured into the gap between the steel profiles. Figure 3 In section B, the sealant is smoothed and polished using a convex putty knife. Figure 4 This is a construction diagram showing the curing and maintenance process after the adhesive injection is completed in Example 5; Figure 4 Photo A shows the construction site after the surface has been leveled. Figure 4 In section B, the film is removed after curing. Figure 5 This is a diagram showing the post-construction inspection and observation results as described in Example 5; Figure 5 Photo A shows the adhesive injection process in April 2025. Figure 5 Image B shows the elasticity of the sealant during an inspection in June 2025. Figure 5 Image C shows the appearance of the sealant during an inspection in June 2025. Figure 6 This is a test result image of the noise reduction effect of the sealant described in Example 5; Figure 6 A in the diagram represents a noise meter used to measure the sound of vehicles passing over the road. Figure 6 B represents the sound of a vehicle passing by the sealing rubber section. Detailed Implementation

[0039] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0040] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0041] In the context of this specification, the word "comprising" is considered to mean "especially including". It should not be interpreted as "consisting of only".

[0042] To enable those skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention will be described in detail below with reference to specific embodiments.

[0043] Example 1 In this embodiment, a road sealant for expansion joints is provided, comprising component A and component B. Component A comprises the following components in parts by weight: 42 parts hydroxyl-terminated polyether polyol (PPG-2000), 18 parts hydroxyl-modified polyether polyol (EP-330N), 9 parts toluene diisocyanate (TDI-80 / 20), 7 parts polymethyl methacrylate (PMMA) micro powder, 4 parts hollow glass microspheres (particle size 20~50μm), 7 parts nitrile rubber powder (particle size 100~200 mesh), 11 parts nano calcium carbonate, 0.4 parts UV-327, 0.25 parts antioxidant 1010 (CAS No.: 6683-19-8), 0.12 parts silicone defoamer, and 3~5 parts solvent, wherein the solvent is ethyl acetate:toluene = 1:1 (…). v / v (It is obtained by mixing.)

[0044] The preparation method of component A is as follows: PPG-2000 and EP-330N are added to the reactor and dehydrated under vacuum at 105℃ for 2.5h, then cooled to 50℃; TDI-80 / 20 is slowly added and heated to 75℃ for 3.5h to obtain polyurethane prepolymer; the temperature is lowered to 40℃, and PMMA micro powder, hollow glass microspheres, nitrile rubber powder, and nano calcium carbonate are added in sequence, and stirred at high speed (1500r / min) for 30min; UV-327, antioxidant 1010, silicone defoamer and solvent are added, stirred at low speed (500r / min) for 15min, degassed under vacuum for 20min, and then sealed and stored.

[0045] Component B comprises the following components in parts by weight: 7 parts diethylenetriamine (DETA), 11 parts polyetheramine D-230, 4 parts hydroxyethyl methacrylate (HEMA), 1.5 parts fumed silica (hydrophobic), 0.15 parts benzisothiazolinone, and 0.6 parts coupling agent KH-550.

[0046] The preparation method of component B is as follows: DETA and polyetheramine D-230 are added to a mixing vessel and stirred at 800 r / min for 10 min at room temperature; HEMA, fumed silica, benzisothiazolinone and coupling agent KH-550 are added in sequence, and stirring is continued for 20 min. Vacuum degassing is performed for 15 min, and the mixture is then sealed and stored.

[0047] Example 2 In this embodiment, another type of road sealant for expansion joints is provided, comprising component A and component B. Component A comprises the following components in parts by weight: 40 parts hydroxyl-terminated polyether polyol (PPG-1000), 15 parts hydroxyl-modified polyether polyol (EP-330N), 8 parts toluene diisocyanate (TDI-80 / 20), 5 parts polymethyl methacrylate (PMMA) micro powder, 3 parts expanded perlite powder (particle size 20~50μm), 6 parts thermoplastic elastomer (particle size 100~200 mesh), 10 parts nano-calcium carbonate, 0.3 parts UV-327 and Tinuvin 770 mixed in equal amounts, 0.2 parts antioxidant 1010 (CAS No.: 6683-19-8), 0.1 parts silicone defoamer Tego Foamex 810, and 3 parts solvent, wherein the solvent is ethyl acetate:toluene = 1:1 (…). v / v (It is obtained by mixing.)

[0048] Component B comprises the following components in parts by weight: 6 parts diethylenetriamine (DETA), 10 parts polyetheramine D-400, 3 parts hydroxyethyl methacrylate (HEMA), 1 part organobentonite, 0.1 parts dichlorooctylisothiazolinone, and 0.5 parts coupling agent KH-540.

[0049] The preparation methods of components A and B are the same as in Example 1.

[0050] Example 3 In this embodiment, another type of road sealant for expansion joints is provided, comprising component A and component B. Component A comprises the following components in parts by weight: 45 parts hydroxyl-terminated polyether polyol (PPG-3000), 20 parts hydroxyl-modified polyether polyol (EMEROX® 14511), 10 parts toluene diisocyanate (TDI-80 / 20), 8 parts polymethyl methacrylate (PMMA) micro powder, 5 parts hollow glass microspheres (particle size 20~50μm), 8 parts nitrile rubber powder (particle size 100~200 mesh), 12 parts nano-calcium carbonate, 0.5 parts UV-327, 0.3 parts antioxidant 1076, 0.2 parts silicone defoamer BYK-024, and 5 parts solvent, wherein the solvent is ethyl acetate:toluene = 1:1 (…). v / v (It is obtained by mixing.)

[0051] Component B comprises the following components in parts by weight: 8 parts diethylenetriamine (DETA), 12 parts polyetheramine D-230, 5 parts hydroxyethyl methacrylate (HEMA), 2 parts fumed silica (hydrophobic), 0.2 parts benzisothiazolinone, and 1.0 part coupling agent KH-792.

[0052] The preparation methods of components A and B are the same as in Example 1.

[0053] Example 4 In this embodiment, another type of road sealant for expansion joints is provided, comprising component A and component B. Component A comprises the following components in parts by weight: 43 parts hydroxyl-terminated polyether polyol (PPG-2000), 19 parts hydroxyl-modified polyether polyol (EP-330N), 9.5 parts toluene diisocyanate (TDI-80 / 20), 6.5 parts polymethyl methacrylate (PMMA) micro powder, 4.2 parts hollow glass microspheres (particle size 20~50μm), 7.6 parts nitrile rubber powder (particle size 100~200 mesh), 11.5 parts nano-calcium carbonate, 0.43 parts a combination of equal amounts of UV-1577 and Chimassorb 944, 0.23 parts antioxidant 1076, 0.12 parts silicone defoamer Deqian 6800, and 4.9 parts solvent, wherein the solvent is ethyl acetate:toluene = 1:1 (…). v / v (It is obtained by mixing.)

[0054] Component B comprises the following components in parts by weight: 7.4 parts diethylenetriamine (DETA), 11.2 parts polyetheramine T-403, 4.8 parts hydroxyethyl methacrylate (HEMA), 1.9 parts fumed silica (hydrophobic), 0.18 parts octylisothiazolinone, and 0.6 parts coupling agent KH-602.

[0055] The preparation methods of components A and B are the same as in Example 1.

[0056] Example 5 In this embodiment, the construction of the expansion joint in the K594-K689 section of the Beijing-Shanghai Expressway in Linyi is taken as an example to illustrate the construction method and performance of the road sealant for expansion joints described in Examples 1-4.

[0057] I. Construction Method 1. Cleaning of telescopic devices Measure and record the length, steel gap width, and number of gaps in the expansion joint to be constructed, and calculate the required amount of sealant. Clean the debris and other contaminants from the gaps between the steel sections of the expansion joint, using tools such as steel flat chisels, wire brushes, and brooms as appropriate based on the actual site conditions, and then clean it thoroughly with high-pressure air. Figure 1 As shown. Use tools such as an angle grinder, wire brush, and steel file to grind the upper edge and side of the steel groove of the telescopic device, removing rust, coating material, and other hard debris adhering to its surface until the metallic luster of the steel is exposed. Use compressed air to blow clean the ground steel surface, ensuring that the bonding surface is free of dust, stains, and debris. Wipe the ground steel surface to be bonded with alcohol, and apply adhesive after the surface is completely dry.

[0058] 2. Injecting adhesive into the telescopic device For areas within the gaps in the steel profile where the rubber waterstop is intact, select a PE foam board of appropriate thickness as the bottom mold, based on the gap width. Any localized holes in the rubber waterstop should be sealed tightly with tape or other filling materials. See [link to relevant documentation]. Figure 2 .

[0059] To prevent accidental spillage or adhesion of the sealant to the edges of gaps and to ensure a clean and aesthetically pleasing work surface, the outer edges of the sealant can be protected with tape or other materials before filling. The protective tape can be removed after filling. After wiping the bonding surface with alcohol and allowing it to dry, slowly pour the prepared sealant material or use a container with a tubular nozzle to fill the gaps in the steel profiles. The size of the nozzle can be adjusted according to the width of the gap to be filled. After filling the gaps or grooves with sealant, use a steel or wooden strip no wider than 5mm to smooth the bonding surface from one end to the other, ensuring full contact between the sealant and the bonding surface to enhance adhesion. See [link to relevant documentation]. Figure 3 For areas with insufficient sealant, apply a small amount of additional filler; use a convex putty knife or plastic scraper to smooth and finish the sealant from one end to the other, ensuring a 3mm vertical height difference between the lowest point of the convex tool and the edge of the filler joint. See [link to relevant documentation]. Figure 4 Cover the surface of the filled adhesive with plastic film.

[0060] 3. Maintenance After the surface has cured, peel off the plastic film or protective tape. During the curing period, do not disturb the surface or touch it to ensure that the surface is smooth and clean. After the sealant has cured for 2-3 hours, the traffic barriers can be removed and traffic can be opened.

[0061] II. Performance Testing The curing and tensile effects of the sealant on the above-mentioned road sections were measured, and the results are shown in Table 1 below: Table 1 Performance Tests of Road Sealants III. Observation of Operational Results This embodiment involves multiple inspections and observations of the road sealant's performance on the aforementioned road sections. The observations show that the road sealant adheres well to the steel profile, has a smooth surface, is 3mm lower than the steel profile plane, and there is no frictional contact between the tire and the sealant surface. There is no accumulation of dust or impurities, and the noise reduction effect is significant, improving driving comfort. Specific details are as follows: Based on seasonal temperature changes, multiple on-site observations were conducted regarding the stretching and compression of the sealant applied during the initial construction phase. The applied sealant exhibited some elasticity due to the increased summer temperatures; when pressed with a finger, the adhesive shifted slightly downwards. There was no accumulation of dust or impurities. At wheel tracks, the uppermost part of the sealant on the steel frame, subjected to repeated friction from vehicle tires, showed a slight 2-3mm detachment from the bond, while the lower part remained unaffected. Figure 5 ).

[0062] The noise level of vehicles passing by the road surface and expansion joints was tested using a noise decibel meter. Figure 6 As shown, the decibel level is lower after the expansion joint is applied. Overall, the sealant treatment significantly improves driving comfort, provides good noise reduction, and offers remarkable maintenance-free benefits.

[0063] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A road sealant for expansion joints, characterized in that, The sealant comprises component A and component B, wherein component A is composed of the following components in parts by weight: 55-65 parts hydroxyl-modified polyether polyol, 8-10 parts toluene diisocyanate, 5-8 parts polymethyl methacrylate micro powder, 3-5 parts noise reduction material, 16-20 parts filler material, 0.3-0.5 parts sunscreen agent, 0.2-0.3 parts antioxidant agent, 0.1-0.2 parts defoamer and 3-5 parts solvent; Component B consists of the following components in parts by weight: 6-8 parts diethylenetriamine, 10-12 parts polyetheramine, 3-5 parts hydroxyethyl methacrylate, 1-2 parts thickener, 0.1-0.2 parts mildew inhibitor and 0.5-1.0 parts coupling agent.

2. The road sealant for expansion joints as described in claim 1, characterized in that, The hydroxyl-modified polyether polyol is preferably a blend of difunctional PPG and trifunctional highly active polyether. Further, 40-45 parts of hydroxyl-terminated polyether polyol and 15-20 parts of hydroxyl-modified polyether polyol are used in combination; the hydroxyl-terminated polyether polyol is selected from PPG-1000, PPG-2000, PPG-3000, H220M or EMEROX® 14511; the hydroxyl-modified polyether polyol is preferably a highly active polyether triol with a functionality of 3, selected from 330N, F330N, G330 or HSH-310.

3. The road sealant for expansion joints as described in claim 1, characterized in that, The noise reduction material is selected from elastic or porous materials. The elastic materials include one or more of nitrile rubber powder, butyl rubber powder, and thermoplastic elastomers. The porous materials include one or more of hollow glass microspheres, expanded perlite powder, and porous polyurethane microspheres. The filler material includes organic fillers and inorganic fillers, and further comprises 6-8 parts of nitrile rubber powder and 10-12 parts of nano-calcium carbonate.

4. The road sealant for expansion joints as described in claim 1, characterized in that, The sunscreen agent is selected from UVA / UVB absorbing or UV quenching agents. The UVA / UVB absorbing agents include, but are not limited to, one or more of UV-327, UV-326, UV-328, UV-531, UV-284, or UV-1577. The UV quenching agents are selected from, but are not limited to, Tinuvin 770, Tinuvin 622, or Chimassorb 944. The antioxidant is a hindered phenolic antioxidant, including but not limited to antioxidant 1010 or antioxidant 1076. Furthermore, the sunscreen agent is a combination of UV-327 and Tinuvin 770, and the antioxidant is antioxidant 1010; or, the sunscreen agent is UV-327, and the antioxidant is antioxidant 1010; or, the sunscreen agent is a combination of UV-1577 and Chimassorb 944, and the antioxidant is antioxidant 1076.

5. The road sealant for expansion joints as described in claim 1, characterized in that, The defoamer is preferably an organosilicon defoamer, including but not limited to one or a combination of several of BYK-024, Tego Foamex 810, Dow Corning DC-1410, and Deqian 6800; The solvent is obtained by mixing equal amounts of ethyl acetate and toluene.

6. The road sealant for expansion joints as described in claim 1, characterized in that, The preparation method of component A is as follows: Hydroxyl-modified polyether polyols are added to a reactor and dehydrated under vacuum at 100-110°C for 2-3 hours. After cooling to 40-60°C, toluene diisocyanate is slowly added, and the mixture is heated to 70-80°C and reacted for 3-4 hours to obtain a polyurethane prepolymer. After cooling to 40-60°C, polymethyl methacrylate micro powder, noise reduction material, and filler are added sequentially and mixed at high speed. Sunscreen, antioxidant, defoamer, and solvent are added, and the mixture is stirred at low speed, defoamed, and sealed for storage. Furthermore, the parameters for the high-speed stirring are as follows: 1200~1700 r / min for 20~40 min; the parameters for the low-speed stirring are as follows: 400~600 r / min for 10~20 min.

7. The road sealant for expansion joints as described in claim 1, characterized in that, The polyetheramine is one or a combination of several of D-230, D-400, and T-403; The thickener is, but is not limited to, one or a combination of several of the following: fumed silica, organobentonite, magnesium aluminosilicate, and montmorillonite. The antifungal agent is an isothiazolinone derivative, selected from one or a combination of several of benzoisothiazolinone, octylisothiazolinone, and dichlorooctylisothiazolinone; The coupling agent is an aminosilane, selected from one or a combination of several of KH-540, KH-550, KH-792, and KH-602.

8. The road sealant for expansion joints as described in claim 1, characterized in that, The preparation method of component B is as follows: Diethylenetriamine and polyetheramine are added to a mixing vessel and stirred evenly at room temperature; hydroxyethyl methacrylate, thickener, fungicide and coupling agent are added in sequence, and the mixture is stirred evenly and degassed before being sealed and stored.

9. The road sealant according to any one of claims 1-8, characterized in that, The sealant is used for filling gaps in structural joints of steel or concrete structures, joints or cracks in pavements, cracks in asphalt concrete pavements, and other areas requiring waterproofing and water-stopping; further, the sealant is used for any of the following: (1) Sealing and filling of expansion joints in cement concrete pavement; (2) Sealing and filling cracks in asphalt concrete pavement; (3) Waterproofing, waterproofing, or sealing of structural joints in concrete structures; (4) Waterproofing, water-stopping, and sealing of structural joints in highway, railway, and subway engineering projects such as tunnels, bridges, bosses, and ballastless tracks; (5) Sealing of joints in concrete or steel structures with irregular widths during maintenance work; (6) Repair of rubber waterstops for bridge expansion joints; (7) Water-stopping filling between steel sections of modular bridge expansion joints.

10. A method for applying the road sealant according to any one of claims 1-9, characterized in that, Includes the following steps: S1: Clean the filling groove of the expansion joint to be constructed until the part to be bonded in the filling groove is fully exposed, free of coating, dust and debris; S2: Mix component A and component B thoroughly and then inject the mixture into the filling tank. The upper surface of the colloid should be 1-3 mm below the edge of the filling tank. S3: Curing is done naturally in 2-6 hours after film application; The execution order of S1 and S2 is not specified. Furthermore, in step S2, for expansion joints made of steel, it is required that rust, coatings, dust and debris on the metal surface be completely removed; for expansion joints made of concrete or asphalt, it is required that surface coatings, dust and debris be fully removed. Furthermore, for deeper filling grooves, PE foam rods or foam boards are placed as bottom molds first, and then the mixed material is injected.

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