Quick-setting MMA elastic mortar, preparation method and construction device thereof

Abstract

The invention relates to quick-setting MMA (methyl methacrylate) elastic mortar, a preparation method and a construction device thereof, the MMA elastic mortar comprises a component A, a component B and a component C, and the weight ratio of the component A to the component B to the component C is 1: (0.5-1.5): 8; when the three materials are uniformly mixed, the MMA resin is subjected to a free radical reaction under the action of peroxide to generate a large amount of heat, a necessary temperature environment is provided for the reaction of polyurethane, reactive hydrogen of hydroxy acrylic acid quickly reacts with the modified isocyanate curing agent at high temperature under the action of the organic tin catalyst, and the curing effect is good. Finally, the elastic mortar material with moderate rigidity and toughness is obtained.

Description

Technical Field

[0001] The present invention relates to the technical field of road maintenance, and particularly relates to a quick-setting MMA elastic mortar, a preparation method thereof, and a construction device therefor. Background Art

[0002] With the continuous expansion of the scale of infrastructure construction in China, a large number of cutting expansion joints are provided on concrete pavements such as airport airfield pavements, highway bridges, and factory area roads to relieve the structural damage to the concrete pavement under the thermal expansion and contraction effect. However, due to the frequent repeated rolling of vehicles and the long-term influence of external factors such as traffic dynamic loads, freeze-thaw cycles, environmental erosion, and temperature alternation, such cement concrete pavements are extremely prone to conditions such as hollowing, peeling, cracking, pitting, and exposed aggregates.

[0003] To avoid more serious deep-seated diseases on the road, which will further affect the normal operation of factory areas, traffic, etc., and lead to higher pavement repair costs, it is extremely important to repair pavement diseases in a timely manner. However, the existing repair materials generally have the following pain points when in use. Firstly, traditional cement-based caulking materials are too rigid and have insufficient interfacial bonding strength, resulting in secondary damage such as edge chipping and corner breakage after repair. At the same time, there are also problems with the curing speed, especially at lower temperatures, and rapid traffic cannot be achieved. Secondly, for commonly used existing materials such as sulfoaluminate rapid-hardening cement, although its reaction speed is relatively fast and its rigidity is relatively strong at normal temperature, and it can usually meet the requirement of opening to traffic in two hours, this material has basically no toughness and its flexural strength is only 2-3 MPa, and its brittle fracture characteristics cannot meet the elastic deformation requirements at the joint.

[0004] In addition, there are also some polymer repair materials on the market, such as epoxy resin mortar, polyurethane mortar, etc., and they all have different degrees of problems: epoxy resin mortar has poor toughness; polyurethane mortar has good elasticity and low-temperature toughness, but both have significant thermosensitive defects, that is, when the environmental temperature is lower than 5°C, the curing rate drops sharply, and the reaction activity is even lost below 0°C, seriously restricting the implementation of emergency repair projects in winter, and lacking all-weather construction adaptability.

[0005] Based on this, it is urgent to develop a new type of repair material with good rigidity and toughness, and at the same time, the curing rate is less affected by temperature. Summary of the Invention

[0006] In view of this, the purpose of the present invention is to provide a quick-setting MMA elastic mortar, a preparation method thereof, and a construction device therefor, effectively solving the problems restricted by factors such as insufficient rigidity and large influence of temperature on the curing speed of existing repair mortars.

[0007] To achieve the above object, the technical solution adopted by the present invention is as follows: A fast-setting MMA elastic mortar, which includes component A, component B and component C. The ratio of the three components A, B and C by weight is 1:(0.5 - 1.5):8; Component A includes the following reaction raw materials by weight: 20 - 40 parts of MMA resin prepolymer, 15 - 35 parts of hydroxyacrylate, 20 - 50 parts of methacrylate, 0.1 - 0.5 parts of inhibitor, 1 - 4 parts of accelerator, 1 - 2 parts of oxygen barrier agent, 0.1 - 0.3 parts of organotin catalyst; Component B includes the following reaction raw materials by weight: 60 - 80 parts of modified isocyanate, 20 - 40 parts of methacrylate; Component C includes the following reaction raw materials by weight: 10 - 20 parts of 20 - 40 mesh quartz sand, 10 - 25 parts of 40 - 70 mesh quartz sand, 30 - 60 parts of 70 - 120 mesh quartz sand, 5 - 35 parts of mineral powder, 0.5 - 2 parts of peroxide.

[0008] Further, the MMA resin prepolymer is prepared in the following manner: Add methacrylate monomer and acrylate monomer into a reaction kettle, stir and mix evenly, heat up to 50 - 80 °C, then dissolve peroxide with methacrylate monomer and drop it into the reaction kettle; Continuously stir for 2 - 4 hours, and then cool down to room temperature; The acrylate monomer is one or more of methyl acrylate, ethyl acrylate, phenyl acrylate.

[0009] Further, the methacrylate is one or more of methyl methacrylate, ethyl methacrylate, n-butyl methacrylate, hexalactone methacrylate, hexadecyl methacrylate, octadecyl methacrylate; The hydroxyacrylate is one or more of 2-hydroxyethyl methacrylate, 2-hydroxypropyl methacrylate, 4-hydroxybutyl acrylate, 2-hydroxyethyl acrylate.

[0010] Further, the inhibitor is one or more of phenol, hydroquinone, p-methoxyphenol, tert-butylhydroquinone; The accelerator is one or more of amines, thioureas, metal organic salts; The oxygen barrier agent is one or more of paraffin, white oil, polyamide wax, polyethylene wax, polytetrafluoroethylene wax; The organotin catalyst is one or more of dibutyltin dilaurate, stannous octoate, chelated tin.

[0011] Further, the modified isocyanate is one or more of polyether polyol modified MDI, polyether polyol modified TDI, polyether polyol modified HDI; Among them, the NCO content in the modified isocyanate is 2 - 12%.

[0012] Furthermore, the peroxide in the C component is one or more of benzoyl peroxide, cumene hydroperoxide, methyl ethyl ketone peroxide, cyclohexanone peroxide, and tert-butyl benzoyl peroxide; and the mineral powder is a mixture of barium sulfate, calcium carbonate, talc powder, and glass fiber powder.

[0013] The present invention also provides a method for preparing a fast-setting MMA elastic mortar, comprising the following steps: Step 1: Prepare component A; add MMA resin prepolymer, methacrylate, hydroxy acrylate, inhibitor, accelerator, oxygen barrier and organotin catalyst into a stirring kettle, and stir with a stirrer to obtain an MMA resin mixture for use; Step 2: Prepare component B; add modified isocyanate and methacrylate into a stirring tank and stir evenly to obtain a modified isocyanate acrylate solution for standby use; Step 3: Preparation of component C: Add 20-40 mesh quartz sand, 40-70 mesh quartz sand, 70-120 mesh quartz sand, mineral powder and peroxide into a stirring kettle, and stir the powder evenly for later use; Step 4: Weigh the three prepared components separately by weight, mix components A and B for 1-2 minutes, then slowly add component C and continue stirring for 3-5 minutes to form a viscous mortar material.

[0014] The present invention also provides a construction device for fast-setting MMA elastic mortar, comprising a base and a stirring and mixing component and a conveying component arranged on the base, wherein the stirring and mixing component comprises a liquid mixing cylinder, a sand material stirring cylinder and a mixing stirring cylinder, wherein the central axis is rotatably sleeved in the liquid mixing cylinder and is transmission-connected to an external driving source; an overflow chamber and a primary mixing chamber are arranged inside the liquid mixing cylinder, wherein the primary mixing chamber is located below the overflow chamber and the two are connected; an A component feed port and a B component feed port are arranged on the primary mixing chamber, and a lifting and feeding auger is arranged on the central axis in the primary mixing chamber, wherein the lifting and feeding auger is adapted to the inner diameter of the primary mixing chamber; the overflow chamber A plurality of overflow ports are provided on the top, and each overflow port is connected to the sand mixing drum through a material pipe; a C component feed port is provided on the sand mixing drum, a rotating shaft is coaxially installed in the sand mixing drum, the top of the rotating shaft is connected to the driving source, and the bottom of the sand mixing drum is connected to the inner cavity of the mixing drum through a gradually shrinking discharge port; stirring blades are provided on the rotating shafts of the mixing drum and the sand mixing drum, and a discharge port is also provided on the mixing drum, and the discharge port corresponds to a conveying component, which is an auger conveyor, and the MMA elastic mortar prepared in the mixing drum is conveyed to the pavement construction area by the auger conveyor.

[0015] Furthermore, the conveying assembly also includes a discharge plate, the discharge port on the mixing drum is connected to the feed port on the auger conveyor, the output end of the auger conveyor is fixedly connected to the discharge plate, and the discharge plate is arranged to be inclined downward. After the A and B components are mixed evenly in the liquid mixing drum, they overflow into the sand mixing drum, and after being mixed evenly with the C component in the sand mixing drum, they are discharged into the mixing drum, and then the formed mortar in the mixing drum is discharged into the pavement construction area through the auger conveyor.

[0016] Furthermore, the bottom of the sand mixing drum is in a conical structure, and an opening and closing valve is installed on the discharge port. The top of the mixing drum is provided with a docking hole that is compatible with the conical structure of the sand mixing drum. The mixture in each sand mixing drum flows from the docking hole into the mixing drum; and the central axis in the liquid mixing drum extends vertically downward into the mixing drum, and the mixing blades are fixedly arranged on the central axis.

[0017] The beneficial effect of the above technical scheme is as follows: the present invention proposes a fast-setting MMA elastic mortar, a preparation method and a construction device thereof, and the fast-setting MMA elastic mortar is prepared by using the component raw materials described in the present invention. After the three raw materials A, B and C are evenly mixed, the MMA resin undergoes a free radical addition reaction under the action of peroxide, and a large amount of heat is generated at this time, so as to provide the necessary temperature environment for the reaction of polyurethane, so that the active hydrogen of hydroxy acrylic acid reacts and cures rapidly with the modified isocyanate curing agent under the action of high temperature and organic tin catalyst, and finally obtains a polymer system with a three-dimensional interconducting network structure, and prepares a mortar material with moderate rigidity and toughness, wherein the MMA resin provides the necessary rigidity of the mortar, and the polyurethane improves the toughness of the mortar and increases the elasticity of the mortar.

[0018] The strong exotherm of MMA free radical polymerization provides the necessary thermal environment for PU curing, overcoming the pain point of low reactivity of polyurethane at low temperatures. The PMMA rigid network and the PU elastic network penetrate each other at the molecular scale. At the same time, the multi-graded quartz sand in the C component reduces the porosity through the densest stacking model, and the nanoparticles of the mineral powder fill the interface defects. The two are wrapped by the polymer network to form a "rigid skeleton-elastic matrix" composite structure. Even if microcracks occur in the particles under the action of external force, they will not break, further optimizing the mechanical gradient.

[0019] The construction device of the fast-setting MMA elastic mortar proposed in the present invention realizes seamless connection of raw material injection, mixing and output through the synergistic effect of dynamic proportion control and a three-stage stirring mechanism, thereby effectively improving construction efficiency.

[0020] Due to the fast-curing characteristics of the MMA resin system, traditional batch mixing equipment cannot avoid downtime for feeding, which easily leads to material waste, pipeline blockage, and reduced construction quality. Secondly, when the aggregate content is as high as 80%, phase separation is likely to occur, and continuous high-shear mixing is required to maintain the homogeneity of the system. This device overcomes the problems existing in existing mixers, such as capacity limitation, proportion fluctuation, and curing out of control, by simultaneously achieving two interrelated effects: continuous and precise proportioning of each component and dynamic rheological control of the mixture.

[0021] The construction device provided by the present invention absorbs upstream feeding fluctuations and ensures continuous downstream discharge. Each sand mixing cylinder can independently complete the preliminary wetting and mixing of the AB mixture and component C (mixing time: 2 - 3 minutes), avoiding proportion fluctuations caused by multi-batch mixing, forming a continuous cycle of "feeding - mixing - overflow discharge", and eliminating the need for downtime for cleaning. Moreover, after the AB mixture is injected at the bottom of the primary mixing chamber, the lifting auger forcibly conveys the AB mixture from bottom to top in a laminar flow form to the overflow chamber, enabling the first-entering material to pass through the high-level overflow port first and avoiding retention. By adjusting the rotational speed of the liquid mixing motor and the speed of the conveying auger, the total time for the material to overflow from the primary mixing chamber to the mixing cylinder is controlled within a preset time period. Meanwhile, the synergistic shearing effect of the sand mixing blades and the mixing blades maintains the dynamic flow viscosity of the material, ensuring that each section of the material experiences the same mixing cycle and avoiding MMA curing. Then, by adjusting the opening and closing frequency of the discharge port valve, the rate of the ABC mixture flowing into the mixing cylinder is regulated to match the continuous injection volume of the upstream A and B mixtures, achieving dynamic balance of capacity. Description of the Drawings

[0022] Figure 1 It is a schematic structural diagram of an embodiment of the construction device of the present invention; Figure 2 It is a front-view structural diagram of the construction device of the present invention; Figure 3 It is a schematic diagram of the appearance and internal structure of the liquid mixing cylinder; Figure 4 It is a schematic diagram of the appearance and internal structure of the sand mixing cylinder; Figure 5 It is a schematic diagram of the appearance and internal structure of the mixing cylinder; Figure 6 It is a schematic diagram of the connection structure between the mixing cylinder and the sand mixing cylinder; Figure 7 It is another schematic structural diagram of the construction device of the present invention.

[0023] Reference numerals: 1 - base, 2 - liquid mixing cylinder, 21 - lifting feed auger, 22 - central shaft, 23 - lifting motor, 24 - overflow chamber, 25 - primary mixing chamber, 26 - liquid overflow pipe, 271 - B - component feed port, 272 - A - component feed port, 3 - sand mixing cylinder, 31 - C - component feed port, 32 - sand mixing motor, 33 - rotating shaft, 34 - sand mixing blade, 35 - discharge port, 4 - mixing and stirring cylinder, 41 - mixing and stirring blade, 42 - mortar overflow pipe, 43 - docking hole, 44 - baffle, 45 - valve, 46 - jack, 5 - conveying assembly, 51 - conveying motor, 52 - material conveying cylinder, 54 - discharge plate, 55 - discharge auger, 6 - vehicle body. Detailed implementation manners

[0024] The present invention will be further described in detail below in conjunction with the drawings and specific implementation manners: Example 1, the present invention aims to provide a fast - setting MMA elastic mortar, using MMA as the rigid main body, and at the same time providing the necessary reaction temperature to promote the curing of polyurethane, so that polyurethane provides the required toughness for the mortar material.

[0025] In this example, the fast - setting MMA elastic mortar mainly consists of three components A, B, and C. Component A is an MMA resin mixture, component B is an acrylate solution modified with isocyanate, and component C is sand and gravel aggregate mixed with peroxide. Specifically, in this example, component A mainly consists of the following raw materials by weight: 35 parts of MMA resin prepolymer, 5 parts of hydroxyethyl methacrylate, 5 parts of hydroxypropyl methacrylate, 5 parts of hydroxyethyl acrylate, 25 parts of methyl methacrylate, 5 parts of n - butyl methacrylate, 10 parts of hexadecyl methacrylate, 10 parts of octadecyl methacrylate, 0.3 part of inhibitor, 2.5 parts of accelerator, 1.2 parts of oxygen - barrier agent, and 0.2 part of organotin catalyst. The inhibitor is 0.3 parts by weight of p - methoxyphenol, the oxygen - barrier agent is 1.2 parts by weight of paraffin wax, and the organotin catalyst is 0.2 parts by weight of dibutyltin dilaurate.

[0026] In this example, component B includes the following raw materials by weight: 80 parts of polyether - modified MDI with 2% NCO content, 8 parts of methyl methacrylate, and 12 parts of octadecyl methacrylate.

[0027] In this example, component C includes the following raw materials by weight: 15 parts of 20 - 40 - mesh quartz sand, 13 parts of 40 - 70 - mesh quartz sand, 40 parts of 70 - 120 - mesh quartz sand, 0.5 part of peroxide, and 32 parts of mineral powder. The peroxide is 0.5 parts by weight of benzoyl peroxide, and the mineral powder is mixed from the following raw materials by weight, including 12 parts of barium sulfate, 8 parts of calcium carbonate, 10 parts of talc powder, and 2 parts of glass fiber powder.

[0028] Based on the above raw material ratio, this embodiment provides a preparation method of fast-setting MMA elastic mortar, which specifically includes the following steps: Step 1: Prepare MMA resin prepolymer, including the following steps: Add 30 parts of methyl methacrylate, 20 parts of n-butyl methacrylate, 5 parts of hexyl methacrylate, 15 parts of methyl acrylate, 15 parts of ethyl acrylate, and 5 parts of phenyl acrylate into the reaction kettle, stir evenly and heat up to 60 °C. After stirring for 30 minutes, dissolve 0.3 parts of benzoyl peroxide in 10 parts of methyl methacrylate, and then slowly add it to the reaction kettle in a dropping manner, continuously stir for 2 - 4 hours, and finally cool down to room temperature to obtain the MMA resin prepolymer for standby.

[0029] Step 2: Prepare Component A MMA resin mixture; Weigh 35 parts of MMA resin prepolymer, 5 parts of hydroxyethyl methacrylate, 5 parts of hydroxypropyl methacrylate, 5 parts of hydroxyethyl acrylate, 25 parts of methyl methacrylate, 5 parts of n-butyl methacrylate, 10 parts of hexadecyl methacrylate, 10 parts of octadecyl methacrylate, 0.3 parts of p-methoxyphenol, 1.5 parts of N,N-dimethyl-p-toluidine, 1 part of N,N-bis(2-hydroxyethyl)-p-toluidine, 1.2 parts of paraffin wax, and 0.2 parts of dibutyltin dilaurate, add them into the stirring kettle, and stir evenly with a stirrer to obtain the MMA resin mixture for standby.

[0030] Step 3: Prepare Component B modified isocyanate acrylate solution; Weigh 80 parts of polyether-modified MDI with 2% NCO content, 8 parts of methyl methacrylate, and 12 parts of octadecyl methacrylate, add them into the stirring kettle and stir evenly to obtain the modified isocyanate acrylate solution for standby.

[0031] Step 4: Prepare Component C filled aggregate; Weigh 15 parts of 20 - 40 mesh quartz sand, 13 parts of 40 - 70 mesh quartz sand, 40 parts of 70 - 120 mesh quartz sand, 12 parts of barium sulfate powder, 8 parts of calcium carbonate, 10 parts of talc powder, 2 parts of glass fiber powder, and 0.5 parts of benzoyl peroxide, add them into the stirring kettle, and stir the powder evenly to obtain the sand and gravel aggregate mixed with peroxide for later use.

[0032] Step 5: Weigh the above-prepared Components A, B, and C according to the weight ratio of 1:1.5:8 respectively, then mix and stir the MMA resin mixture and the modified isocyanate acrylate solution for 1 minute, and then slowly add the filled aggregate and continue to stir for 3 minutes to prepare the fast-setting MMA elastic mortar.

[0033] Example 2, this embodiment provides a preparation method of fast-setting MMA elastic mortar, which specifically includes the following steps: Step 1: First, prepare the MMA resin prepolymer according to the method of Example 1 above. Then, weigh 30 parts of the MMA resin prepolymer, 5 parts of hydroxyethyl methacrylate, 10 parts of hydroxypropyl methacrylate, 5 parts of hydroxyethyl acrylate, 25 parts of methyl methacrylate, 5 parts of n-butyl methacrylate, 10 parts of hexadecyl methacrylate, 10 parts of octadecyl methacrylate, 0.3 part of p-methoxyphenol, 1.5 parts of N,N-dimethyl-p-toluidine, 1 part of N,N-bis(2-hydroxyethyl)-p-toluidine, 1.2 parts of paraffin wax, and 0.2 part of dibutyltin dilaurate, and add them to a stirring kettle and stir evenly to obtain a MMA resin mixture for standby.

[0034] Step 2: Weigh 80 parts of polyether-modified MDI with 3% NCO content, 8 parts of methyl methacrylate, and 12 parts of octadecyl methacrylate, and stir evenly in a stirring kettle to obtain a modified isocyanate acrylate solution for standby.

[0035] Step 3: Weigh the above-prepared components A, B, and C according to a weight ratio of 1:1.3:8 respectively. The raw materials and preparation method of component C are the same as those in Example 1. Then, place the MMA resin mixture and the modified isocyanate acrylate solution into a container and mix and stir for 2 min, and then slowly add the filling aggregate and continue to stir for 4 min to prepare a quick-setting MMA elastic mortar.

[0036] Example 3. This example provides a preparation method of a quick-setting MMA elastic mortar, which specifically includes the following steps: Step 1: First, prepare the MMA resin prepolymer according to the method of Example 1 above. Then, weigh 30 parts of the MMA resin prepolymer, 5 parts of hydroxyethyl methacrylate, 10 parts of hydroxypropyl methacrylate, 5 parts of hydroxyethyl acrylate, 25 parts of methyl methacrylate, 5 parts of n-butyl methacrylate, 10 parts of hexadecyl methacrylate, 10 parts of octadecyl methacrylate, 0.3 part of p-methoxyphenol, 1.5 parts of N,N-dimethyl-p-toluidine, 1 part of N,N-bis(2-hydroxyethyl)-p-toluidine, 1.2 parts of paraffin wax, and 0.2 part of dibutyltin dilaurate, and use a stirrer to stir evenly to obtain a MMA resin mixture for standby.

[0037] Step 2: Weigh 70 parts of polyether-modified MDI with 4.5% NCO content, 15 parts of methyl methacrylate, and 15 parts of octadecyl methacrylate, and stir evenly to obtain a modified isocyanate acrylate solution for standby.

[0038] Step 3: Weigh the above-prepared components A, B, and C according to a weight ratio of 1:1.05:8 respectively. The raw materials and preparation method of component C are the same as those in Example 1. Then, place the MMA resin mixture and the modified isocyanate acrylate solution into a container and mix and stir for 1 min, and then slowly add the filling aggregate and continue to stir for 3 min to prepare a quick-setting MMA elastic mortar.

[0039] Example 4. This example provides a preparation method for a fast-setting MMA elastic mortar, which specifically includes the following steps: Step 1: First, prepare the MMA resin prepolymer according to the method of Example 1 above. Then, weigh 28 parts of the MMA resin prepolymer, 5 parts of hydroxyethyl methacrylate, 10 parts of hydroxypropyl methacrylate, 7 parts of hydroxyethyl acrylate, 25 parts of methyl methacrylate, 5 parts of n-butyl methacrylate, 10 parts of hexadecyl methacrylate, 10 parts of octadecyl methacrylate, 0.3 part of p-methoxyphenol, 1.5 parts of N,N-dimethyl-p-toluidine, 1 part of N,N-bis(2-hydroxyethyl)-p-toluidine, 1.2 parts of paraffin wax, and 0.2 part of dibutyltin dilaurate, and stir evenly with a stirrer to obtain an MMA resin mixture for standby.

[0040] Step 2: Weigh 70 parts of polyether-modified MDI with 6% NCO content, 15 parts of methyl methacrylate, and 15 parts of octadecyl methacrylate and stir evenly to obtain a modified isocyanate acrylate solution for standby.

[0041] Step 3: Weigh the above-prepared three components A, B, and C according to a weight ratio of 1:1:8 respectively. The raw materials and preparation method of component C are the same as those in Example 1. Then, place the MMA resin mixture and the modified isocyanate acrylate solution into a container and mix and stir for 2 minutes. After that, slowly add the filling aggregate and continue to stir for 2 minutes to prepare the fast-setting MMA elastic mortar.

[0042] Example 5. This example provides a preparation method for a fast-setting MMA elastic mortar, which specifically includes the following steps: Step 1: First, prepare the MMA resin prepolymer according to the method of Example 1 above. Then, weigh 25 parts of the MMA resin prepolymer, 5 parts of hydroxyethyl methacrylate, 10 parts of hydroxypropyl methacrylate, 10 parts of hydroxyethyl acrylate, 25 parts of methyl methacrylate, 5 parts of n-butyl methacrylate, 10 parts of hexadecyl methacrylate, 10 parts of octadecyl methacrylate, 0.3 part of p-methoxyphenol, 1.5 parts of N,N-dimethyl-p-toluidine, 1 part of N,N-bis(2-hydroxyethyl)-p-toluidine, 1.2 parts of paraffin wax, and 0.2 part of dibutyltin dilaurate, and stir evenly with a stirrer to obtain an MMA resin mixture for standby.

[0043] Step 2: Weigh 70 parts of polyether-modified MDI with 8% NCO content, 15 parts of methyl methacrylate, and 15 parts of octadecyl methacrylate and stir evenly.

[0044] Step 3: Weigh the above-prepared three components A, B, and C according to the weight ratio of 1:0.8:8 respectively. The raw materials and preparation method of component C are the same as those in Example 1. Then, place the MMA resin mixture and the acrylate solution of the modified isocyanate into a container and mix and stir for 2 minutes. After that, slowly add the filling aggregate and continue to stir for 2 minutes to prepare the quick-setting MMA elastic mortar.

[0045] Example 6: This example provides a preparation method of a quick-setting MMA elastic mortar, which includes the following steps: Step 1: First, prepare the MMA resin prepolymer according to the method in Example 1 above. Then, weigh 20 parts of the MMA resin prepolymer, 5 parts of hydroxyethyl methacrylate, 10 parts of hydroxypropyl methacrylate, 15 parts of hydroxyethyl acrylate, 25 parts of methyl methacrylate, 5 parts of n-butyl methacrylate, 10 parts of hexadecyl methacrylate, 10 parts of octadecyl methacrylate, 0.3 part of p-methoxyphenol, 2 parts of N,N-dimethyl-p-toluidine, 2 parts of N,N-di(2-hydroxyethyl)-p-toluidine, 1.2 parts of paraffin wax, and 0.2 part of dibutyltin dilaurate, and stir evenly with a stirrer.

[0046] Step 2: Weigh 70 parts of polyether-modified MDI with 10% NCO content, 15 parts of methyl methacrylate, and 15 parts of octadecyl methacrylate and stir evenly.

[0047] Step 3: Prepare the filling aggregate of component C; weigh 15 parts of 20-40 mesh quartz sand, 13 parts of 40-70 mesh quartz sand, 40 parts of 70-120 mesh quartz sand, 12 parts of barium sulfate powder, 8 parts of calcium carbonate, 10 parts of talc powder, 2 parts of glass fiber powder, and 2 parts of benzoyl peroxide, and stir the powder evenly with a stirrer to obtain the sand and gravel aggregate mixed with peroxide for later use.

[0048] Step 5: Weigh the above-prepared three components A, B, and C according to the weight ratio of 1:0.5:8 respectively. Then, place the MMA resin mixture and the acrylate solution of the modified isocyanate into a reaction kettle and mix and stir for 1 minute. After that, slowly add the filling aggregate and continue to stir for 3 minutes to prepare the quick-setting MMA elastic mortar.

[0049] Test example: Respectively load the elastic mortar materials prepared according to the methods in Examples 1-6 above into the cement mortar molds of 40×40×160 mm. Among them, Examples 1-5 are cured and maintained at room temperature, and Example 6 is cured and maintained at -20°C. The performance of the test blocks is tested at room temperature, and the test results are shown in Table 1 below: Table 1 Comparison of test results of Examples 1-6 Sample Curing conditions 2h Compressive strength (MPa) 2h Flexural strength (MPa) 2h Flexural deformation (mm) 7d Compressive strength (MPa) 7d Flexural strength (MPa) 7d Flexural deformation (mm) Specimen status Example 1 Normal temperature 15.0 2.3 40 16.3 2.6 39 Not broken Example 2 Normal temperature 17.3 2.8 37 17.5 2.9 38 Not broken Example 3 Normal temperature 18.5 3.1 36 19.0 3.3 34 Not broken Example 4 Normal temperature 20.0 4.3 30 20.5 4.4 31 Not broken Example 5 Normal temperature 23.0 5.2 25 23.3 5.1 24 Cracks appeared but not broken Example 6 -20℃ 27.0 6.4 15 28.1 6.6 13 Cracks appeared but not broken As can be seen from the above table, for the MMA elastic mortar material prepared according to the method and ratio of the present invention, the 2-hour compressive strength of the room-temperature solidified specimens in Examples 1-5 reached 15.0-23.0 MPa, the 7-day compressive strength increased to 16.3-23.3 MPa, and the flexural strength increased synchronously (2.3-5.2 MPa), indicating that the material has excellent rigid support ability and meets the strength requirements of traffic loads.

[0050] The flexural deformation of the room-temperature specimens was as high as 25-40 mm, far exceeding the <5 mm flexural deformation of traditional cement-based materials. The specimens remained intact under significant deformation, proving that the material achieved efficient coordination of rigidity and toughness through the interpenetrating structure of the PMMA rigid skeleton and the polyurethane elastic network.

[0051] After curing at -20°C in Example 6 of the present invention, the 2-hour compressive strength reached 27.0 MPa, the 7-day compressive strength further increased to 28.1 MPa, and the flexural strength was as high as 6.4-6.6 MPa, breaking through the technical bottleneck that traditional mortar materials cannot cure at low temperatures. Moreover, under such low-temperature conditions, the elastic mortar material prepared by the present invention could still exhibit a deformation of 15 mm, significantly higher than that of sulphoaluminate rapid-hardening cement, indicating that the synergistic effect of free radical polymerization and isocyanate cross-linking reactions of the material of the present invention could still maintain the toughness function at low temperatures. In addition, the specimens in Examples 1-5 of the present invention reached the traffic strength within 2 hours under room-temperature conditions, and all specimens did not completely break during the test, indicating that the material significantly reduced the shrinkage stress and effectively inhibited crack propagation through the microporous filling of multi-graded aggregates and mineral powder.

[0052] In summary, through the synergistic reaction of MMA free radical polymerization and isocyanate cross-linking, combined with the multi-graded aggregate reinforcement system, the present invention successfully solved the core problems of traditional repair materials such as curing failure at low temperatures, imbalance between rigidity and toughness, and insufficient interfacial bonding. Its low-temperature adaptability, rapid curing property, and high crack resistance provide a revolutionary solution for cold-region pavement repair and all-weather emergency projects. The rapid-setting MMA elastic mortar prepared by the method of the present invention exhibits excellent mechanical properties under both room-temperature and low-temperature conditions, and the curing conditions can be adjusted according to engineering requirements, making it suitable for rapid repair projects in different environments.

[0053] Example 7: Based on the above Embodiments 1-6, this embodiment provides a rapid-setting MMA elastic mortar construction device. Using this construction device, the MMA elastic mortar prepared by the above method can be applied to the repair of road expansion joints. When the rapid-setting MMA elastic mortar provided by the present invention is actually applied, three pre-prepared components are mixed in this construction device at a weight ratio of 1:(0.5-1.5):8 at the construction site, and grouting construction is carried out along the extension path of the expansion joint. By controlling the feeding rate of each component into the barrel, the injection amount of each component and the discharge amount of the mortar material formed by mixing are always kept balanced, so that the three raw materials can be continuously injected into the barrel to meet the continuous operation of road repair.

[0054] Due to the limited capacity of existing mixers and similar devices, the amount of raw materials added each time is fixed, and the formed material obtained after mixing is also certain. Therefore, the length of the road surface that can be repaired is limited. When the mixture in the mixer is used up, it is necessary to re-prepare the mortar raw materials according to the ratio, which not only affects the construction efficiency, but also causes material waste and unstable construction quality. The construction device provided by the present invention can skillfully solve the above problems. By continuously adding and mixing various raw materials, the continuity and high efficiency of the construction process are ensured. In addition, due to the particularity of the three components A, B, and C in the present invention, the mixture needs to be continuously stirred to maintain its relatively viscous state and avoid solidification. Existing mixers cannot meet this special requirement, while the construction device of the present invention can be designed according to this characteristic to ensure the stability and operability of the mixture during the construction process, thus significantly improving the efficiency and quality of the repair of road expansion joints, and having significant technical advantages and practical application value.

[0055] As Figure 1 and 2 shown, the rapid-setting MMA elastic mortar construction device provided by the present invention includes a base 1, and a mixing component and a conveying component 5 arranged on the base. The base is mounted on a mobile vehicle body. At the construction site, the upstream mixing component is used to continuously prepare the MMA elastic mortar, and then the prepared mortar material is transported to the expansion joint construction area by the downstream conveying component. Driving the vehicle body to move along the length direction of the expansion joint, the mortar material can be continuously poured into the construction area.

[0056] In the specific structure, in this embodiment, the mixing component includes a liquid mixing barrel 2, a sand mixing barrel 3, and a mixing barrel 4. As Figure 3As shown in the figure, the cross-section of the liquid mixing cylinder 2 in the present invention is of a T-shaped structure, and its interior includes an overflow chamber 24 above and a primary mixing chamber 25 below. The two chambers are connected, and the inner diameter of the overflow chamber 24 is larger than that of the primary mixing chamber 25. The central shaft 22 is concentrically and rotatably sleeved inside the liquid mixing cylinder 2, and its top is drivingly connected to a lifting motor 23 provided on the top surface of the liquid mixing cylinder 2. The bottom of the central shaft 22 penetrates through the liquid mixing cylinder 2 in a sealed manner and extends into the mixing and stirring cylinder 4, and is rotationally and sealingly connected to the bottom surface of the liquid mixing cylinder 2.

[0057] On the lower side wall of the primary mixing chamber 25, an A-component feed port and a B-component feed port are provided at intervals, and the two feed ports are flush. The lifting and feeding auger 21 is arranged in the primary mixing chamber 25 and on the central shaft 22 (the installation method of the lifting and feeding auger 21 is the prior art and will not be elaborated here). The A and B components are respectively pumped into the primary mixing chamber 25 from the corresponding feed ports, and the lifting and feeding auger 21 arranged in the primary mixing chamber 25 is used to helically convey the AB mixture upward to the overflow chamber 24 at the top. The upper edge of the overflow chamber 24 is evenly provided with overflow ports along the circumference, and a liquid overflow pipe 26 is fixedly sealed on each overflow port. The output end of the liquid overflow pipe 26 is communicated with the inside of the slurry stirring cylinder. With such a setting of the liquid mixing cylinder 2 in this embodiment, by driving the lifting motor 23 to work through the controller, the central shaft 22 can be driven to rotate at a constant speed. Thus, after the A and B components are respectively pumped into the primary mixing chamber 25 from the corresponding feed ports, under the action of the lifting and feeding auger 21, the AB mixture is conveyed from bottom to top into the overflow chamber 24. The auger arranged in the primary mixing chamber 25 can ensure that the materials in the primary mixing chamber 25 are unidirectionally conveyed upward in a laminar flow form, avoiding backmixing. By controlling the injection rates of the A and B components, the AB mixture in the primary mixing chamber 25 can continuously enter the overflow chamber 24. And as the amounts of the A and B component materials injected into the primary mixing chamber 25 increase, the amount of the AB mixture in the overflow chamber 24 spreads and increases upward, and finally is discharged into the sand material stirring cylinder 3 through the liquid overflow pipes 26 evenly arranged at the top of the overflow chamber 24.

[0058] During actual implementation, a corrosion-resistant magnetic pump can be used as the raw material conveying pump for the A and B components to avoid raw material pollution caused by leakage during the conveying process. A flow meter can also be installed on the feed pipeline to real-time feedback data to the controller for facilitating dynamic adjustment of the pump speed (this is the prior art and will not be elaborated here). By regulating the feeding speeds of the three components, it can always be ensured that the raw materials are continuously injected into the corresponding cylinders according to the set ratio and at the set speed, so as to realize continuous construction in the construction area and avoid the situation where the raw materials are insufficient and need to be re-prepared when the construction of the expansion joint construction area is not completed.

[0059] Such as Figure 2 and 4As shown in the figure, the liquid mixing cylinder 2 is connected to the sand mixing cylinder 3 through a liquid overflow pipe 26. The AB mixture in the liquid mixing cylinder 2 can flow from the liquid overflow pipe 26 into the sand mixing cylinder 3, where the three components A, B, and C are preliminarily stirred and mixed. Specifically, the sand mixing cylinder 3 is provided with a C-component feed port. A rotating shaft 33 is installed concentrically and rotatably inside the sand mixing cylinder 3. The top of the rotating shaft 33 is connected to a sand mixing motor 32 through transmission. A sand mixing blade 34 is fixedly sleeved on the rotating shaft 33. The bottom of the sand mixing cylinder 3 is connected to the inner cavity of the mixing and stirring cylinder 4. By driving the sand mixing motor 32 to work, the rotating shaft 33 can drive the sand mixing blade 34 to rotate, so as to stir the ABC mixture in the cylinder. The stirred mixture is discharged into the mixing and stirring cylinder 4 through the discharge port 35 at the bottom of the cylinder.

[0060] As Figure 4 and 5 shown in the figure, the bottom of the sand mixing cylinder 3 is of a conical structure. The top of the mixing and stirring cylinder 4 is provided with a docking hole 43 adapted to the conical structure of the sand mixing cylinder 3. The ABC component mixture in each sand mixing cylinder 3 flows from the docking hole 43 into the mixing and stirring cylinder 4. And the central shaft 22 in the liquid mixing cylinder 2 extends vertically downward into the mixing and stirring cylinder 4. The mixing blade 41 is fixedly arranged on the central shaft 22. Driving the lifting motor 23 to work can synchronously drive the mixing blade 41 to rotate at a constant speed, so as to further stir and mix the mixture in the mixing and stirring cylinder 4, enabling the three components A, B, and C to fully react to generate an elastic mortar material. As the ABC mixture in the mixing and stirring cylinder 4 increases, it can overflow into the screw conveyor along the mortar overflow pipe 42 provided on the cylinder wall, so as to convey the MMA elastic mortar prepared and formed in the mixing and stirring cylinder 4 to the road construction area through the screw conveyor.

[0061] Furthermore, as Figure 6As shown in the figure, in this embodiment, three sand mixing drums 3 are provided around the liquid mixing drum 2. A gradually narrowing discharge port 35 is provided at the bottom of the sand mixing drum 3. A docking hole 43 is opened at the top of the mixing and stirring drum 4, and each docking hole 43 is adapted to the discharge port 35. A valve 45 is also provided at the position of the discharge port 35 at the bottom of the sand mixing drum 3, and the inner diameter of the discharge port 35 is relatively small. When the AB mixture overflows into the sand mixing drum 3 containing the C component, first close the valve 45 to block the connection between the sand mixing drum 3 and the mixing and stirring drum 4. After driving the sand mixing blade 34 to initially stir the three components evenly and the amount of the mixture in the drum accumulates to a set height, then open the valve 45 to allow the ABC mixture to flow into the mixing and stirring drum 4 from the discharge port 35. In this way, the timing of the mixture flowing into the mixing and stirring drum 4 can be controlled to ensure that the mixture has sufficient mixing time in the sand mixing drum 3. At the same time, the AB mixture continuously enters the sand mixing drum 3 to be mixed with the C component, and the evenly stirred ABC mixture is discharged into the mixing and stirring drum 4 through the bottom discharge port 35, and the mixing and stirring blade 41 in the mixing and stirring drum 4 is used for more sufficient stirring.

[0062] As Figure 2 shown, in this embodiment, the conveying component 5 includes a screw conveyor and a discharge plate 54. The screw conveyor includes a conveying motor 51, a feeding cylinder 52, and a discharge screw 55. The feeding cylinder 52 is horizontally fixed on the base 1 through a protective frame. The feeding port at the top of the feeding cylinder 52 is correspondingly communicated with the mortar overflow pipe 42. A discharge screw 55 is arranged in the feeding cylinder 52. One end of the discharge screw 55 is drivingly connected to the conveying motor 51, and the other end is rotatably connected to the flange arranged at the end of the discharge port 35 of the feeding cylinder 52. A discharge plate 54 is fixedly connected to the output end of the feeding cylinder 52, and the discharge plate 54 is arranged obliquely downward. After the A and B components are evenly mixed in the liquid mixing drum 2, they overflow into the sand mixing drum 3, are initially mixed evenly with the C component in the sand mixing drum 3, and then are discharged into the mixing and stirring drum 4. Then, the screw conveyor is used to discharge the formed mortar material in the mixing and stirring drum 4 into the road construction area for road repair operations.

[0063] It should be noted that the central shaft 22 in the liquid mixing drum 2 and the rotating shafts 33 in each sand mixing drum 3 in this embodiment are all independently controlled by a driving motor for operation. In actual application, a planetary gear structure can also be used as the driving source for the rotating shafts 33 and the central shaft 22. In order to more accurately control the feeding rates of the A, B, and C components, flow sensors can also be arranged at the positions of each feeding port, and pressure sensors can also be added in the mixing and stirring drum 4 to monitor the material capacity in the drum in real time, so as to facilitate the controller to dynamically adjust the feeding rates of each component (this is the prior art and will not be described in detail here).

[0064] Description of working principle: When the quick-setting MMA elastic mortar construction device provided in this embodiment is actually applied, the construction device is fixed on a mobile vehicle body 6 (such as an engineering vehicle or a rail vehicle), ensuring that the vehicle body 6 has a translational driving function. Adjust the overall height of the device so that the end of the discharge plate 54 maintains a set vertical distance from the expansion joint construction area, and adjust the inclination angle of the discharge plate 54 to match the width of the expansion joint. Prepare sufficient amounts of the three components A, B, and C according to the repair area and depth of the road expansion joint, and weigh and reserve them according to the weight ratio of 1:(0.5 - 1.5):8. Select the corresponding ratio adaptively according to the size and damage degree of the construction area.

[0065] Then, turn on the lifting motor 23, the sand mixing motor 32, and the mixing motor in sequence. After each shaft runs smoothly, start preheating the conveying component 5. Then, pour the weighed components A and B into the primary mixing chamber 25 from the corresponding feed ports of the liquid mixing cylinder 2 respectively. When injecting, control the corresponding injection rates of the two components through the controller respectively. The lifting auger in the primary mixing chamber 25 continuously conveys the AB mixture upward to the overflow chamber 24. By controlling the injection rates of components A and B, the mixture of the two continuously drains from the overflow chamber 24 into the sand mixing cylinder 3 through the liquid overflow pipe 26. First, pour the weighed component C into the sand mixing cylinder 3 from the feed port. At this time, the valve 45 at the discharge port 35 at the bottom of the sand mixing cylinder 3 is in the closed state, blocking the connection between the sand mixing cylinder 3 and the mixing cylinder 4. After the AB mixture flows into the sand mixing cylinder 3 from the liquid overflow pipe 26, the rotating shaft 33 drives the sand mixing blades 34 to perform preliminary mixing of the three components A, B, and C. When the ABC mixture in the sand mixing cylinder 3 accumulates to a set height, open the discharge port valve 45, and the mixture flows into the mixing cylinder 4 under the action of gravity. At the same time, the AB mixture continuously enters the sand mixing cylinder 3 to be mixed with component C, ensuring continuous supply of the mixture. In the mixing cylinder 4, the mixing blades 41 perform more thorough mixing of the ABC components, enabling the three components to fully react to generate elastic mortar material.

[0066] As the ABC mixture in the mixing cylinder 4 increases, the mortar overflows into the screw conveyor along the mortar overflow pipe 42. Start the conveying motor 51, and the discharge auger 55 conveys the MMA elastic mortar prepared and formed in the mixing cylinder 4 to the road construction area for repair pouring of the expansion joint. Drive the mobile vehicle body 6 to move uniformly along the length direction of the expansion joint, ensuring that the mortar material is continuously and evenly poured in the construction area for repair pouring of the expansion joint. Avoid the occurrence of cavities or non-compact situations. When the repair operation is completed, turn off each motor and conduct a comprehensive cleaning of the construction device. Clean the residual mortar in the liquid mixing cylinder 2, the sand mixing cylinder 3, and the mixing cylinder 4 to prevent curing and affecting the next use.

[0067] In addition, three-way valves can be installed on the feeding pipes for Component A and Component B. If there is still remaining material in the liquid mixing cylinder and the sand mixing cylinder 3 after construction, the valve 45 at the bottom of the sand mixing cylinder 3 can be directly opened to discharge the slurry. For the AB mixture in the liquid mixing cylinder 2, the lifting motor 23 can be rotated in the reverse direction, and the three-way valve on one of the feeding pipes can be closed, so that the lifting and feeding auger 21 conveys the residual material in the cylinder downward to the bottom of the cylinder, and then the material in the cylinder can be pumped out from the connected pipe to avoid waste.

[0068] The quick-setting MMA elastic mortar construction device provided in this embodiment strictly adds raw materials according to the weight ratio, and through multiple mixing and stirring stages such as preliminary mixing and full mixing, it ensures that the three components A, B, and C fully react to generate a mortar material with stable performance, improving the repair quality and durability. Through the multi-stage stirring and mixing and continuous material supply design, the continuous preparation and transportation of MMA elastic mortar are realized, solving the problems of limited capacity of traditional mixers and the need for intermittent addition of raw materials, improving the construction efficiency of road repair, reducing the construction time and labor cost. Through the precise weight ratio and multi-stage stirring and mixing design, it ensures that the three components A, B, and C fully react to generate a mortar material with stable performance, improving the repair quality and durability.

[0069] Example 8: On the basis of Example 7, the same parts will not be described again. The difference is that this example provides another discharging structure for the sand mixing cylinder. Specifically, in actual application, the above valve structure can also be to open an insertion hole 46 on the side wall of the mixing and stirring cylinder 4, and a baffle 44 is slidably inserted in the insertion hole 46. By controlling the insertion and extraction of the baffle 44, the timing of the ABC mixture flowing into the mixing and stirring cylinder 4 can be controlled, the flow of the mixture can be controlled, and the mixing process is optimized.

[0070] Example 9: On the basis of Examples 7 and 8, the same parts will not be described again. The difference is that as Figure 7 shown, the overflow port on the mixing and stirring cylinder can also be set at the bottom, making the mixing and stirring cylinder in a conical structure to improve the construction efficiency; at the same time, the discharge port on the discharging auger can be set at the bottom of the conveying cylinder, and the mortar material is transported to the construction area through an inclined discharge plate, avoiding waste caused by the accumulation of mortar material in the conveying cylinder.

[0071] The embodiments of the present invention described above do not constitute a limitation to the protection scope of the present invention. The basic concept of the present invention is to use MMA as the rigid main body, and at the same time provide the necessary reaction temperature to promote the curing of polyurethane, so that the polyurethane provides the required toughness for the mortar material, and apply the prepared elastic mortar material to the repair of the pavement expansion joint through the above construction device to meet the continuous operation of pavement repair. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the claims of the present invention.

Claims

1. A fast-setting MMA elastic mortar, characterized in that: The MMA elastic mortar comprises component A, component B and component C, wherein the proportion of the three components A, B and C by weight is 1: (0.5-1.5): 8; The component A comprises the following reaction raw materials in parts by weight: 20-40 parts of MMA resin prepolymer, 15-35 parts of hydroxy acrylate, 20-50 parts of methacrylate, 0.1-0.5 parts of inhibitor, 1-4 parts of accelerator, 1-2 parts of oxygen barrier, and 0.1-0.3 parts of organotin catalyst; The B component includes the following reaction raw materials in parts by weight: 60-80 parts of modified isocyanate and 20-40 parts of methacrylate; The C component includes the following reaction raw materials in parts by weight: 10-20 parts of 20-40 mesh quartz sand, 10-25 parts of 40-70 mesh quartz sand, 30-60 parts of 70-120 mesh quartz sand, 5-35 parts of mineral powder, and 0.5-2 parts of peroxide.

2. The fast-setting MMA elastic mortar according to claim 1, characterized in that: The MMA resin prepolymer is prepared by the following method: adding methacrylate monomer and acrylate monomer into a reaction kettle, stirring and mixing evenly, heating to 50-80° C., then dissolving peroxide with methacrylate monomer and adding dropwise into the reaction kettle; continuously stirring for 2-4 hours, and then cooling to room temperature; the acrylate monomer is one or more of methyl acrylate, ethyl acrylate, and phenyl acrylate.

3. The fast-setting MMA elastic mortar according to claim 1, characterized in that: The methacrylate is one or more of methyl methacrylate, ethyl methacrylate, n-butyl methacrylate, caprolactone methacrylate, hexadecyl methacrylate, and octadecyl methacrylate; the hydroxyacrylate is one or more of hydroxyethyl methacrylate, hydroxypropyl methacrylate, hydroxybutyl acrylate, and hydroxyethyl acrylate.

4. The fast-setting MMA elastic mortar according to claim 1, characterized in that: The inhibitor is one or more of phenol, hydroquinone, p-methoxyphenol, and tert-butylhydroquinone; the accelerator is one or more of amines, thioureas, and metal organic salts; the oxygen barrier is one or more of paraffin, white oil, polyamide wax, polyethylene wax, and polytetrafluoroethylene wax; and the organic tin catalyst is one or more of dibutyltin dilaurate, stannous octoate, and chelated tin.

5. The fast-setting MMA elastic mortar according to claim 1, characterized in that: The modified isocyanate is one or more of polyether polyol modified MDI, polyether polyol modified TDI, and polyether polyol modified HDI; wherein the NCO content in the modified isocyanate is 2-12%.

6. The fast-setting MMA elastic mortar according to claim 1, characterized in that: The peroxide in the C component is any one of benzoyl peroxide, cumene hydroperoxide, methyl ethyl ketone peroxide, cyclohexanone peroxide, and tert-butyl benzoyl peroxide; and the mineral powder is a mixture of barium sulfate, calcium carbonate, talcum powder, and glass fiber powder.

7. A method for preparing the fast-setting MMA elastic mortar according to any one of claims 1 to 6, characterized in that: The following steps are involved: Step 1: Prepare component A; add MMA resin prepolymer, methacrylate, hydroxy acrylate, inhibitor, accelerator, oxygen barrier and organotin catalyst into a stirring kettle, and stir with a stirrer to obtain an MMA resin mixture for use; Step 2: Prepare component B; add modified isocyanate and methacrylate into a stirring tank and stir evenly to obtain a modified isocyanate acrylate solution for standby use; Step 3: Preparation of component C: Add 20-40 mesh quartz sand, 40-70 mesh quartz sand, 70-120 mesh quartz sand, mineral powder and peroxide into a stirring kettle, and stir the powder evenly for later use; Step 4: Weigh the prepared components A, B, and C respectively by weight, mix and stir components A and B for 1-2 minutes, then slowly add component C and continue stirring for 3-5 minutes to form a viscous mortar material.

8. A construction device for repairing road expansion joints using the fast-setting MMA elastic mortar according to any one of claims 1 to 6, characterized in that: It comprises a base and a stirring and mixing component and a conveying component arranged on the base, wherein the stirring and mixing component comprises a liquid mixing barrel, a sand material mixing barrel and a mixing and mixing barrel, wherein the central axis is rotatably sleeved in the liquid mixing barrel and is transmission-connected to an external driving source; an overflow chamber and a primary mixing chamber are arranged inside the liquid mixing barrel, wherein the primary mixing chamber is located below the overflow chamber and the two are connected; an A component feed port and a B component feed port are arranged on the primary mixing chamber, and a lifting and feeding auger is arranged on the central axis in the primary mixing chamber, wherein the lifting and feeding auger is adapted to the inner diameter of the primary mixing chamber; a plurality of overflow ports are arranged on the top of the overflow chamber, and each overflow port is respectively connected to the sand material mixing barrel through a material pipe; The sand material mixing drum is provided with a C component feed port, a rotating shaft is coaxially installed in the sand material mixing drum, the top of the rotating shaft is connected to the driving source, and the bottom of the sand material mixing drum is connected to the inner cavity of the mixing drum through a gradually shrinking discharge port; The rotating shafts of the mixing drum and the sand mixing drum are both provided with mixing blades. The mixing drum is also provided with a discharge port, and the discharge port corresponds to a conveying component. The conveying component is an auger conveyor, and the MMA elastic mortar prepared in the mixing drum is transported to the pavement construction area by the auger conveyor.

9. The fast-setting MMA elastic mortar construction device according to claim 8, characterized in that: The conveying assembly also includes a discharge plate. The discharge port on the mixing drum is connected to the feed port on the auger conveyor. The output end of the auger conveyor is fixedly connected to the discharge plate. The discharge plate is arranged to be inclined downward. After the A and B components are mixed evenly in the liquid mixing drum, they overflow into the sand mixing drum, and after being mixed evenly with the C component in the sand mixing drum, they are discharged into the mixing drum. Then, the formed mortar in the mixing drum is discharged into the pavement construction area through the auger conveyor.

10. The fast-setting MMA elastic mortar construction device according to claim 8, characterized in that: The bottom of the sand mixing drum is a conical structure, and an opening and closing valve is installed on the discharge port. The top of the mixing drum is provided with a docking hole that is compatible with the conical structure of the sand mixing drum. The mixture in each sand mixing drum flows from the docking hole into the mixing drum; and the central axis in the liquid mixing drum extends vertically downward into the mixing drum, and the mixing blades are fixedly arranged on the central axis.

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