A silicone-modified two-component acrylate grouting gel material and a preparation method thereof

Abstract

This invention discloses a silicone-modified two-component acrylate grouting gel material and its preparation method, relating to the technical field of engineering seepage prevention and plugging materials. The material is composed of component A and component B mixed in a weight ratio of 0.9:1 to 1.1:1. Component A includes acrylic acid, metal composite oxide, composite crosslinking agent, silicone acryloyloxy prepolymer, composite accelerator, wetting and dispersing agent, and deionized water; component B includes composite carbonate, silicone-modified waterborne acrylic emulsion, composite initiator, retarder, and deionized water. Components A and B are prepared separately and then mixed. The mixed material has a viscosity ≤35 mPa·s, an early compressive strength ≥450 kPa after 6 hours, a volume shrinkage rate ≤6.5% after 28 days, a bond strength ≥1.75 MPa, and is resistant to salt spray and acid / alkali corrosion. It maintains stable performance after 8 months of storage at 25°C and is suitable for seepage control in complex conditions such as underground tunnels and municipal utility tunnels.

Description

Technical Field

[0001] This invention belongs to the technical field of engineering seepage prevention and plugging materials, specifically relating to an organosilicon-modified two-component acrylate grouting gel material and its preparation method. Background Technology

[0002] Acrylic grouting materials are widely used in the treatment of micro-cracks and seepage in underground engineering, water conservancy and hydropower, tunnels and utility tunnels due to their advantages such as low viscosity, good permeability, and environmental friendliness. Traditional acrylic grout uses water as a dispersion medium and forms a gel through the free radical polymerization of acrylate monomers, which has a good filling effect on micro-cracks in concrete. However, with the increasingly complex service environments of engineering projects, especially in scenarios such as high-altitude tunnels, cross-sea channels, chemical foundations, and integrated utility tunnels, materials are subjected to extreme conditions such as high salt spray corrosion, wet-dry cycles, freeze-thaw cycles, and acid rain erosion. Traditional acrylic gel materials have revealed significant performance bottlenecks.

[0003] First, traditional acrylate gel materials have poor weather resistance and water resistance. Their molecular structure is based on hydrophilic polyacrylate as the main chain. Under high humidity or long-term immersion in water, the gel is prone to swelling, softening, or even degradation, leading to water-blocking failure. At the same time, the materials lack effective anti-UV aging and anti-salt spray corrosion designs. In open-air or coastal projects, their performance degrades rapidly, and their service life is generally less than 3-5 years.

[0004] Secondly, existing materials have significant shortcomings in mechanical properties and bonding durability. Pure acrylate gels have limited cross-linking density and compressive strength typically below 0.3 MPa, making them unable to withstand long-term effects of formation water pressure and surrounding rock stress. Their interfacial adhesion with inorganic substrates such as concrete and rock masses mainly relies on physical bonding and lacks chemical bonding, making them highly susceptible to debonding under alternating wet and dry conditions or temperature changes, leading to secondary leakage.

[0005] Furthermore, some existing modified systems suffer from poor compatibility, complex processes, or performance trade-offs. For example, while polyurethane modification can improve the elasticity and water resistance of materials, the isocyanate groups are prone to hydrolysis in high humidity environments, and the materials become brittle at low temperatures and soften at high temperatures, resulting in a narrow applicable temperature range. Epoxy resin modification can improve strength, but the system viscosity increases significantly, losing its ability to penetrate micron-level cracks. Simply adding nanofillers or fibers often causes uneven dispersion, sedimentation, and stratification, affecting the uniformity of grouting construction. In addition, existing two-component grouting materials mostly employ a single modification strategy, making it difficult to achieve a synergistic effect of low viscosity, high adhesion, resistance to extreme environments, and long-term storage.

[0006] In terms of preparation processes, some modified systems require high temperature (>90℃) or high shear (>1000rpm) conditions, resulting in high energy consumption, stringent equipment requirements, and significant quality fluctuations during industrial-scale production. Furthermore, existing materials have limited methods for adjusting gel time, are sensitive to application temperature and mixing ratios, and have a narrow on-site operability window. The shelf life of components A and B is generally short (3-6 months), and these components are prone to precipitation, stratification, or decreased activity, affecting the reliability of engineering applications. Summary of the Invention

[0007] In order to overcome the shortcomings of the prior art, the present invention aims to provide an organosilicon-modified two-component acrylate grouting gel material and its preparation method, so as to solve the technical problems of poor resistance to extreme environments and bonding durability, high energy consumption in the preparation process, and short storage period of existing acrylate grouting materials.

[0008] To achieve the above objectives, the present invention employs the following technical solution: In a first aspect, the present invention provides an organosilicon-modified two-component acrylate grouting gel material, comprising component A and component B, wherein component A and component B are mixed in a weight ratio of 0.9:1 to 1.1:1; Component A comprises the following raw materials in parts by weight: 22-38 parts acrylic acid, 6-9.5 parts metal composite oxide, 1.1-1.9 parts composite crosslinking agent, 9-14 parts organosilicon acryloyloxy prepolymer, 1.2-4.8 parts composite accelerator, 0.3-0.6 parts wetting and dispersing agent, and 48-75 parts deionized water; Component B comprises the following raw materials in parts by weight: 7-13 parts of composite carbonate, 12-18 parts of organosilicon-modified waterborne acrylic emulsion, 2.5-7.5 parts of composite initiator, 0.2-0.5 parts of retarder, and 62-78 parts of deionized water.

[0009] A further improvement of the present invention is that the metal composite oxide is a mixture of nano-MgO and nano-Al2O3 in a mass ratio of 2.5 to 3.2:1; the composite crosslinking agent is a mixture of pentaerythritol triacrylate and N-hydroxymethylacrylamide in a mass ratio of 1:(0.8 to 1.2); and the composite accelerator is a mixture of N,N-dimethylaniline and dimethylethanolamine in a mass ratio of 1:(1.1 to 1.3).

[0010] A further improvement of the present invention is that the composite carbonate is a mixture of NaHCO3 and NH4HCO3 in a mass ratio of 2.8 to 3.3:1; the composite initiator is a mixture of potassium persulfate and sodium persulfate double salt in a mass ratio of 1.8 to 2.2:1; the retarder is sodium bisulfite; and the wetting and dispersing agent is a polycarboxylate wetting and dispersing agent.

[0011] A further improvement of the present invention is that the number average molecular weight of the organosilicon acryloyloxy prepolymer is 1800~2500 and the shelf life is ≥8 months; the solid content of the organosilicon modified waterborne acrylic emulsion is 38%~46% and the particle size is 90~130nm.

[0012] A further improvement of the present invention is that the viscosity of the grout gel material after mixing is ≤35mPa·s at 25℃, the gel time is adjustable from 12 to 30min, the volume shrinkage rate is ≤6.5% after 28 days, and the bonding strength with the concrete base layer is ≥1.75MPa.

[0013] Secondly, the present invention also provides a method for preparing an organosilicon-modified two-component acrylate grouting gel material, comprising the following steps: S1, the organosilicon acryloyloxy prepolymer is dispersed in deionized water, and a mixed solution of acrylic acid, metal composite oxide, composite crosslinking agent and wetting and dispersing agent is added in sequence. After the reaction, a composite accelerator is added, and the mixture is stirred and filtered to obtain component A. S2, dissolve the composite carbonate in deionized water, add the organosilicon-modified waterborne acrylic emulsion, then add the composite initiator and retarder, and obtain component B by stirring and filtering; S3, Mix component A and component B at a weight ratio of 0.9:1 to 1.1:1 to obtain the grouting gel material.

[0014] A further improvement of the present invention is that the preparation method of the organosilicon acryloyloxy prepolymer includes: dehydrating polyether triol to a water content ≤0.08% at 80~84℃ and a vacuum degree of -0.092~-0.096MPa; adding hexamethylene diisocyanate and stannous octoate at 60~64℃, and reacting at 76~80℃ until the -NCO content is 7.5%~9.0%; cooling to 70~74℃ and adding γ-methacryloyloxypropyltrimethoxysilane, and reacting until the -NCO content is 2.8%~4.5%; and adding 0.15%~0.25% p-hydroxyanisole and then filtering.

[0015] A further improvement of this invention is that the preparation method of the organosilicon-modified waterborne acrylic emulsion includes: mixing 28-35 parts by weight of butyl acrylate, 15-22 parts by weight of methyl methacrylate, 6-9 parts by weight of hydroxypropyl acrylate, 4-7 parts by weight of vinyltrimethoxysilane, and 3-5 parts by weight of acrylic acid; adding an emulsifier aqueous solution accounting for 60% of the total emulsifier amount to a reaction vessel, heating to 78-82°C, adding 10% of the mixed monomers and 0.8-1.2% by weight of potassium persulfate aqueous solution accounting for the total mass of the mixed monomers, and maintaining the temperature until fluorescence appears; adding the remaining 40% of the emulsifier aqueous solution, the remaining 90% of the mixed monomers, and the same amount of potassium persulfate aqueous solution, and maintaining the temperature at 79-83°C for 55-60 minutes; adjusting the pH to 7.0-7.8, adding 0.2-0.3 wt% propylene glycol methyl ether acetate, and filtering.

[0016] A further improvement of the present invention is that the preparation of component A is specifically as follows: 75%~80% of deionized water is mixed with organosilicon acryloyloxy prepolymer and stirred at 340~360 rpm until homogeneous; the temperature is controlled at ≤38℃, and acrylic acid is added dropwise until the pH reaches 2.2~2.8; metal composite oxide is added in batches, with an interval of 8~10 min between each batch, until the system is transparent and the pH rises to 4.2~4.8; the remaining deionized water, composite crosslinking agent, and wetting and dispersing agent are dissolved at 70~74℃ and then pumped into a reaction vessel, and the reaction is carried out at 48~52℃ for 50~60 min; the temperature is lowered to 22~26℃, composite accelerator is added, and the mixture is stirred until the viscosity reaches 18~28 mPa·s and the pH reaches 4.6~5.4, and then filtered.

[0017] A further improvement of this invention is that the preparation of component B is as follows: at ≤30℃, the composite carbonate is added to deionized water and stirred until completely dissolved; organosilicon-modified waterborne acrylic emulsion is added and stirred until homogeneous; the composite initiator is added in batches, with an interval of 6-8 minutes between each batch; finally, the retarder is added and stirred until the viscosity is 19-29 mPa·s; the mixture is filtered and stored in a brown, light-proof, sealed container; when using, component A and component B are mixed through a static mixer with ≥12 mixing elements, a fluid flow rate of 0.5-1.0 m / s, and a mixing time of 6-9 minutes.

[0018] Compared with the prior art, the present invention has the following beneficial effects: This invention provides a silicone-modified two-component acrylate grouting gel material. The two components, A and B, are used in a weight ratio of 0.9:1 to 1.1:1. A silicone acryloyloxy prepolymer and a silicone-modified waterborne acrylic emulsion are introduced as core modifying components. Combined with specific proportions of metal composite oxides, composite crosslinking agents, composite accelerators, composite carbonates, composite initiators, and retarders, this material significantly improves overall performance compared to existing acrylate grouting materials. The test results of the examples show that the viscosity of the mixed slurry at 25℃ is only 28.9~34.5 mPa·s, meeting the requirements for microcrack penetration; the early compressive strength at 6 hours reaches 453.7~538.4 kPa, enabling rapid water plugging; the compressive strength of the solidified sand body at 28 days reaches 558.2~639.5 kPa, demonstrating excellent structural strength; the volume shrinkage rate at 28 days is only 5.0%~6.3%, effectively preventing the generation of secondary cracks; and the bond strength with the concrete substrate reaches 1.76~2.03 MPa, significantly improving bond durability. Regarding corrosion resistance, the strength retention rate after 7 days of immersion in 5% H2SO4 is ≥87.6%, after 7 days of immersion in 5% NaOH is ≥92.1%, and after 12 months of immersion in 5% NaCl is ≥88.9%, demonstrating its ability to withstand harsh service environments such as high salt spray and strong acids and alkalis. After 8 months of storage at 25℃, the viscosity change rate is ≤±2.7%, and the gel time change is ≤±1.8 min, indicating storage stability far exceeding that of existing similar materials. This product solves the technical problems of insufficient resistance to extreme environments, poor adhesion durability, and short shelf life of existing technologies.

[0019] This invention also provides a method for preparing a silicone-modified two-component acrylate grouting gel material. Component A is prepared by dispersing a silicone acryloyloxy prepolymer in deionized water, then sequentially adding a mixed solution of acrylic acid, a metal composite oxide, a composite crosslinking agent, and a wetting and dispersing agent, followed by reaction and then adding a composite accelerator. Component B is prepared by dissolving a composite carbonate in deionized water, then adding a silicone-modified waterborne acrylic emulsion, followed by the addition of a composite initiator and a retarder. This method avoids the harsh conditions required by existing technologies, such as high temperature and pressure or high-speed stirring. The entire process requires no specially customized equipment and can be completed using only conventional industrial-grade reaction equipment, resulting in low energy consumption and no additional VOC emissions. Test data shows that the grout obtained by this method has a viscosity low enough to meet the requirements for microcrack penetration, considerable early compressive strength at 6 hours, excellent compressive strength of the solidified sand at 28 days, low volume shrinkage, high bonding strength with the concrete substrate, and outstanding resistance to salt spray, acids, and alkalis, as well as a long shelf life. The process steps of this method are logically clear. The design of preparing components A and B separately and then mixing them allows for flexible adjustment of the mixing ratio according to project requirements during on-site construction. The two-component mixing has good uniformity and strong consistency in industrial mass production, showing good prospects for industrialization. Detailed Implementation

[0020] To enable those skilled in the art to understand the features and effects of the present invention, the terms and expressions used in the specification and claims are explained and defined in general below. Unless otherwise specified, all technical and scientific terms used herein have the ordinary meaning understood by those skilled in the art regarding the present invention, and in case of conflict, the definitions in this specification shall prevail.

[0021] The theories or mechanisms described and disclosed herein, whether right or wrong, should not in any way limit the scope of the invention, that is, the contents of the invention can be implemented without being limited by any particular theory or mechanism.

[0022] In this document, all features defined by numerical ranges or percentage ranges, such as numerical values, quantities, contents, and concentrations, are for the sake of brevity and convenience only. Accordingly, descriptions of numerical ranges or percentage ranges should be considered as covering and specifically disclosing all possible sub-ranges and individual numerical values ​​(including integers and fractions) within those ranges.

[0023] In this article, unless otherwise specified, “contains,” “includes,” “containing,” “has,” or similar terms cover the meanings of “composed of” and “mainly composed of,” for example, “A contains a” covers the meanings of “A contains a and others” and “A contains only a.”

[0024] For the sake of brevity, not all possible combinations of the technical features in each implementation scheme or embodiment are described herein. Therefore, as long as there is no contradiction in the combination of these technical features, the technical features in each implementation scheme or embodiment can be combined arbitrarily, and all possible combinations should be considered within the scope of this specification.

[0025] This invention provides a silicone-modified two-component acrylate grouting gel material, which is a two-component system of A and B, mixed in a weight ratio of 0.9:1 to 1.1:1. Component A comprises the following raw materials in parts by weight: 22-38 parts acrylic acid, 6-9.5 parts metal composite oxide, 1.1-1.9 parts composite crosslinking agent, 9-14 parts silicone acryloyloxy prepolymer, 1.2-4.8 parts composite accelerator, 0.3-0.6 parts wetting and dispersing agent, and 48-75 parts deionized water. The metal composite oxide is preferably a mixture of nano-MgO and nano-Al2O3 in a mass ratio of 2.5-3.2:1; the composite crosslinking agent is preferably a mixture of pentaerythritol triacrylate and N-hydroxymethylacrylamide in a mass ratio of 1:(0.8-1.2); and the composite accelerator is preferably a mixture of N,N-dimethylaniline and dimethylethanolamine in a mass ratio of 1:(1.1-1.3). Component B comprises the following raw materials in parts by weight: 7-13 parts of complex carbonate, 12-18 parts of organosilicon-modified waterborne acrylic emulsion, 2.5-7.5 parts of complex initiator, 0.2-0.5 parts of retarder, and 62-78 parts of deionized water. The complex carbonate is preferably a mixture of NaHCO3 and NH4HCO3 in a mass ratio of 2.8-3.3:1; the complex initiator is preferably a mixture of potassium persulfate and sodium persulfate double salt in a mass ratio of 1.8-2.2:1; the retarder is preferably sodium bisulfite; and the wetting and dispersing agent is preferably a polycarboxylate wetting and dispersing agent.

[0026] In this invention, the organosilicon acryloyloxy prepolymer is a key modification intermediate for component A, with a number-average molecular weight controlled between 1800 and 2500, and a shelf life of ≥8 months when stored at 25°C in the dark. The organosilicon-modified waterborne acrylic emulsion is a key modification intermediate for component B, with a solid content of 38% to 46% and a particle size of 90 to 130 nm, and a shelf life of ≥8 months when stored at 25°C in the dark.

[0027] In this invention, the viscosity of the grout after mixing the grouting gel material is ≤35mPa·s at 25℃, the gelation time is adjustable from 12 to 30min, the volume shrinkage rate is ≤6.5% after 28 days, the bonding strength with the concrete base layer is ≥1.75MPa, and the strength retention rate after soaking in 5% NaCl solution for 12 months is ≥88%.

[0028] This invention also provides a method for preparing an organosilicon-modified two-component acrylate grouting gel material, comprising the following steps: S1 provides organosilacryloxy prepolymer; S2 provides silicone-modified waterborne acrylic emulsions; S3, the organosilicon acryloyloxy prepolymer is dispersed in deionized water, and a mixed solution of acrylic acid, metal composite oxide, composite crosslinking agent and wetting and dispersing agent is added in sequence. After the reaction, a composite accelerator is added, and the mixture is stirred and filtered to obtain component A. S4, dissolve the composite carbonate in deionized water, add the organosilicon-modified waterborne acrylic emulsion, then add the composite initiator and retarder, and obtain component B by stirring and filtering; S5, mix component A and component B at a weight ratio of 0.9:1 to 1.1:1 to obtain the grouting gel material.

[0029] The above-mentioned organosilicon acryloyloxy prepolymer can be prepared by the following method. Raw materials include: polyether triol (Mn=1500~1800, hydroxyl value 56±2 mgKOH / g, water content ≤0.3%); hexamethylene diisocyanate (HDI, purity ≥99.6%, color ≤20 Hazen); γ-methacryloyloxypropyltrimethoxysilane (KH570, purity ≥98.5%, hydrolyzed chlorine ≤0.01%); stannous octoate (catalyst, purity ≥99.0%, active tin content 28±1%); p-hydroxyanisole (polymerization inhibitor, purity ≥99.0%); deionized water (prohibited throughout the process, only for equipment cleaning, conductivity ≤8 μS / cm). The equipment used is a four-necked reactor with a vacuum system (ultimate vacuum ≤ -0.1MPa), jacketed temperature control (temperature control accuracy ±1℃), and anchor-type stirring (stirring blade diameter is 70%~75% of the reactor's inner diameter), with a volume selectable from 1000L to 5000L; supplemented by a 120-mesh stainless steel filter, a nitrogen generator (purity ≥99.99%), a Karl Fischer moisture analyzer, and a di-n-butylamine titration detection device. In the specific preparation process, polyether triol is first added to the reactor, and a vacuum is drawn to a vacuum degree of -0.092~-0.096MPa. The jacket is then turned on and heated to 80~84℃, and the temperature is maintained for dehydration for 50~60 minutes. The anchor-type stirring speed is 100rpm, and samples are taken every 10 minutes to test the moisture content, stopping when the moisture content is ≤0.08%. Simultaneously, KH570 is vacuum filtered through a 0.22μm organic filter membrane to remove mechanical impurities, and then sealed for later use. Then shut off the vacuum system, purge with nitrogen to atmospheric pressure, and lower the reactor temperature to 60-64°C. Add HDI and stannous octoate sequentially in a weight ratio of polyether triol:HDI:stannous octoate = 1:(3.8-4.2):(0.008-0.012). Adjust the stirring speed to 220±10 rpm and stir for 10 min. Then raise the temperature to 76-80°C at a rate of 1°C / 5 min and maintain the temperature for 130-150 min. Take a sample every 20 min and determine the -NCO content using the di-n-butylamine titration method. Proceed to the next step when the -NCO content stabilizes at 7.5%-9.0%. Next, lower the reactor temperature to 70-74℃, and slowly add KH570 dropwise at a weight ratio of KH570:polyether triol = (3.5-4.5):1, with the dropping rate controlled at reactor volume × 0.05 L / min. After the addition is complete, continue the reaction at this temperature for 135-155 min, checking the -NCO content every 30 min. Stop heating when the -NCO content stabilizes at 2.8%-4.5%. Finally, lower the reactor temperature to 36-40℃, add 0.15%-0.25% p-hydroxyanisole by the total mass of the prepolymer, stir at 180 rpm for 15 min, and filter naturally through a 120-mesh stainless steel filter. Pour nitrogen into a dry polyethylene sealed container, purge to a slight positive pressure (0.01-0.02 MPa), seal, and store in a light-protected environment at 20-30℃.The resulting organosilicon acryloyloxy prepolymer has a hydrolysis rate of ≤0.4% / month and a storage period of ≥8 months.

[0030] The organosilicon-modified waterborne acrylic emulsion of this invention can be prepared by the following method. The raw materials include: hard monomer methyl methacrylate (MMA, purity ≥99.5%, polymerization inhibitor content ≤50ppm); soft monomer butyl acrylate (BA, purity ≥99.5%, polymerization inhibitor content ≤50ppm); functional monomers hydroxypropyl acrylate (HPA, purity ≥99.0%), vinyltrimethoxysilane (VTES, purity ≥98.0%, hydrolyzed chlorine ≤0.02%), and acrylic acid (AA, purity ≥99.5%); the emulsifier is sodium dodecylbenzenesulfonate (anionic acid). The film-forming agent is a mixture of ionic (purity ≥98.0%) and fatty alcohol polyoxyethylene ether (non-ionic, EO number 10~12, purity ≥98.0%); the initiator is potassium persulfate (KPS, purity ≥99.0%, active oxygen content ≥6.7%); the neutralizing agent is 20% ammonia solution; the film-forming aid is propylene glycol methyl ether acetate (PMA, purity ≥99.0%, VOC content conforms to HJ2548-2016); the deionized water conductivity is ≤8μS / cm, and the total hardness is ≤3mg / L. The equipment consists of a four-necked reactor equipped with a paddle stirrer (inclined blade turbine type, stirring diameter 60%~65% of the reactor's inner diameter), a reflux condenser, a constant flow drip pump (accuracy ±0.1mL / min), a mixing tank, a 100-mesh nylon filter, a laser particle size analyzer, a solids content analyzer, and a pH meter. In the preparation process, 28-35 parts of BA, 15-22 parts of MMA, 6-9 parts of HPA, 4-7 parts of VTES, and 3-5 parts of AA are first mixed evenly in a mixing tank at 300 rpm for 10 minutes to obtain a mixed monomer. Separately, 45-55 parts of deionized water are dissolved in an emulsifier (sodium dodecylbenzenesulfonate: fatty alcohol polyoxyethylene ether = 1:1.2-1.5) at 250 rpm for 15 minutes to obtain an emulsifier aqueous solution, which is divided into two portions: 60% for seed emulsion and 40% for core-shell polymerization. Add 60% emulsifier aqueous solution to the reactor, heat to 78-82℃, stir at 300 rpm, and start reflux. Take 10% of the mixed monomers and mix with 0.8%-1.2% of KPS (pre-dissolved in 5 parts of deionized water to prepare a 5wt% aqueous solution), and add it dropwise to the reactor at a rate of 2 mL / min for 15-25 min. Then keep warm for 30 min until the emulsion shows a pale blue fluorescence, obtaining the seed emulsion. Then mix the remaining 40% emulsifier aqueous solution with the remaining 90% of the mixed monomers and add it dropwise to the reactor at a rate of 4-6 mL / min. At the same time, prepare a 5wt% aqueous solution of the remaining KPS and add it dropwise at a rate of 1 mL / min. During the dropwise addition, maintain the reactor temperature at 79-83℃ and the stirring speed at 340-360 rpm. After the dropwise addition is completed, continue to keep warm for 55-60 min.Then cool to 43~47℃, add 20% ammonia water to adjust the pH to 7.0~7.8, and stir at 300 rpm; add 0.2~0.3wt% of PMA film-forming aid according to the total mass of the emulsion, and stir for 20 min; continue to cool to 23~27℃, filter through a 100-mesh nylon filter to obtain the organosilicon modified waterborne acrylic emulsion with a solid content of 38%~46%, a particle size of 90~130nm, compatibility with acrylate system ≥98% (no stratification after standing for 72h), and a storage period of ≥8 months at 25℃ in the dark.

[0031] The preparation of component A is as follows: 75%–80% of the total water volume of component A is added to a jacketed, temperature-controlled, turbine-stirred stainless steel reactor. The turbine is turned on at a speed of 340–360 rpm. The aforementioned organosilicon acryloyloxy prepolymer is slowly added at a rate of 5 kg / min. After addition, stirring is continued for 10–14 min until a uniform, particle-free, milky-white emulsion is formed. Then, the jacket cooling water is turned on to control the reactor temperature at ≤38℃. Acrylic acid is added dropwise at a rate of 80–100 kg / h using a metering pump. During the dropwise addition, the stirring speed is maintained at 350 rpm, and the temperature is monitored in real time. If the temperature exceeds 38℃, the dropwise rate is reduced. After the dropwise addition is completed, stirring is continued for 20 min. The pH of the system is checked using a pH meter and found to be stable at 2.2–2.8. The proportionally mixed metal composite oxides are added to the reactor in 2-5 batches, with each batch having an equal amount and an interval of 8-10 minutes between batches. After each batch is added, the mixture is stirred for 5 minutes before adding the next batch. After all the batches are added, the stirring speed is increased to 440-460 rpm, and the temperature inside the reactor is kept ≤48℃. The mixture is stirred continuously until the system is completely transparent (about 25-35 minutes), at which point the pH rises to 4.2-4.8. The remaining 20%-25% of deionized water of component A is added to the mixing tank, followed by the composite crosslinking agent and wetting and dispersing agent. The temperature is raised to 70-74℃, and the stirring speed is 250 rpm. The mixture is stirred for 18 minutes until completely dissolved. The solution is then pumped into the reactor at a rate of 100 L / h using a metering pump. After the pumping is complete, the stirring speed of the reactor is increased to 740-760 rpm, the jacket heating is turned on, and the temperature inside the reactor is controlled at 48-52℃. The reaction is maintained at this temperature for 50-60 minutes. Turn off the heating, turn on the jacket cooling, and lower the temperature inside the reactor to 22~26℃. Add the compounding accelerator, maintain a stirring speed of 750 rpm, and stir for 10 minutes. Take a sample for testing; the viscosity at 25℃ should be 18~28 mPa·s, and the pH should be 4.6~5.4. After passing the test, filter component A through a 100-mesh stainless steel filter, pack it into a sealed polyethylene container, and store it in a dark environment at room temperature (25±5℃) for at least 8 months.

[0032] The preparation of component B is as follows: A stainless steel reactor (3000L~8000L volume) with jacketed temperature control and paddle stirring (flat blade, diameter 70~75% of the inner diameter of the reactor) is used, supplemented by a metering pump, rotational viscometer, 100-mesh nylon filter, and brown light-proof polyethylene sealed container. Raw materials are prepared according to the above weight proportions. At ≤30℃, all deionized water is added to the reactor, and the paddle stirring speed is turned on at 270~290rpm. The composite carbonate is slowly added (addition rate 3kg / min), and stirring is continued for 20~30min until completely dissolved and the system is clear and transparent. Maintaining the stirring speed and temperature, the organosilicon-modified waterborne acrylic emulsion is slowly added (addition rate 10kg / min), and stirring is continued for 15min until homogeneous. The composite initiator is added in 2~5 batches, each batch in equal amounts, with a batch interval of 6~8min. After each batch is added, stirring is continued for 3min until completely dissolved. Finally, the retarder is added, and stirring is continued for 8min. The viscosity at 25℃ is tested to be 19~29 mPa·s. After passing the test, the product is filtered through a 100-mesh nylon filter and immediately placed into a brown, light-proof polyethylene sealed container. It is then sealed and stored at room temperature (20~30℃), avoiding direct sunlight. The shelf life is ≥8 months.

[0033] During on-site mixing, a two-component static mixer (≥12 mixing elements) and a grouting pump (metering accuracy ±1%) are used. Before use, inspect the appearance of components A and B: component A is a transparent liquid, and component B is a milky white liquid, without stratification, sedimentation, or clumping, and the viscosity meets the finished product standard. Load components A and B separately into the grouting pump hopper, connect to the static mixer, and adjust the pump speed to achieve an output weight ratio of 0.9:1 to 1.1:1 for components A and B. Run the pump unloaded for 5 minutes to confirm no leakage and accurate metering. Under a construction environment of 25±3℃, start the grouting pump and pump components A and B simultaneously into the mixer, controlling the fluid flow rate at 0.5~1.0 m / s, and the mixing time at 6~9 minutes. The mixed slurry is a uniform milky white liquid, without stratification or streaks, and the viscosity at 25℃ is ≤35 mPa·s. The gel time can be adjusted by finely adjusting the amount of composite accelerator in component A or the amount of retarder in component B: to shorten the gel time to 12-18 min, increase the amount of composite accelerator in component A by 0.2-0.5 parts; to extend the gel time to 20-30 min, increase the amount of retarder in component B by 0.1-0.2 parts. The gel time is the time when the grout loses its fluidity after mixing. During grouting, the mixed grout should be injected within the middle half of the gel initiation and gel solidification time. The injection pressure should be controlled at 0.15-0.35 MPa, the injection flow rate at 60-90 mL / min, and the grout should be continuously injected from the lower end of the crack to the upper end to ensure that the grout fully fills the microcracks without any air bubbles remaining.

[0034] To ensure product quality, this invention also includes key points for comprehensive process quality control. All raw materials must be tested upon arrival and only those meeting specifications can be used. Moisture-absorbing materials (such as KH570, VTES, and carbonates) must be stored in sealed containers, and their moisture content must be tested again before use. Temperature, vacuum, stirring speed, and dropping rate at each reaction stage must be strictly controlled according to parameters and monitored in real time, with deviations not exceeding ±2℃, ±0.002MPa, ±10rpm, and ±0.5mL / min, respectively. Intermediate testing: For each batch of organosilicon acryloyloxy prepolymer, -NCO content, moisture content, and molecular weight are tested; for each batch of organosilicon-modified waterborne acrylic emulsion, solid content, particle size, pH, and compatibility are tested. Finished product testing: For each batch of components A and B, viscosity and pH are tested; component B is additionally tested for initiator activity (iodometric method). Only products that pass the tests can be packaged. All intermediates and finished products must be stored at room temperature, protected from light, avoiding high temperatures (>40℃), low temperatures (<0℃), and direct sunlight. Performance is sampled and tested monthly during storage to ensure stable performance.

[0035] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined by the appended claims.

[0036] The following examples use instruments and equipment conventional in the art. Experimental methods in the following examples, unless otherwise specified, are generally performed under conventional conditions or as recommended by the manufacturer. All raw materials used in the following examples are conventional commercially available products with specifications conventional in the art. In this specification and the following examples, unless otherwise specified, "%" represents weight percentage, "parts" represents parts by weight, and "ratio" represents weight proportion.

[0037] Example 1 S1: Preparation of organosilicon acryloyloxy prepolymer Polyether triol (Mn=1500~1800, hydroxyl value 56±2mgKOH / g) was added to a reactor and dehydrated under vacuum of -0.094MPa and 82℃ until the water content was ≤0.08%. The temperature was lowered to 62℃, and HDI and stannous octoate were added at a weight ratio of polyether triol:hexamethylene diisocyanate (HDI):stannous octoate = 1:4.0:0.01. The temperature was then raised to 78℃ and the reaction proceeded until the -NCO content reached 8.2%. The temperature was lowered to 72℃, and KH570 was added dropwise at a weight ratio of γ-methacryloyloxypropyltrimethoxysilane (KH570):polyether triol = 4.0:1. The reaction was maintained at this temperature until the -NCO content reached 3.5%. Cool to 38°C, add 0.2% p-hydroxyanisole by mass of the prepolymer, stir for 15 min, filter through a 120-mesh filter, and store under nitrogen to obtain organosilicon acryloyloxy prepolymer.

[0038] S2: Preparation of silicone-modified waterborne acrylic emulsion 32 parts by weight of butyl acrylate, 18 parts by weight of methyl methacrylate, 7.5 parts by weight of hydroxypropyl acrylate, 5.5 parts by weight of vinyltrimethoxysilane, and 4 parts by weight of acrylic acid were mixed evenly to obtain a mixed monomer. Sodium dodecylbenzenesulfonate (60% of the total emulsifier) ​​and an aqueous emulsifier solution of fatty alcohol polyoxyethylene ether were added to a reaction vessel. The temperature was raised to 80°C, and 10% of the mixed monomer and a potassium persulfate aqueous solution (potassium persulfate accounted for 1.0% of the total mass of the mixed monomer, prepared as a 5wt% aqueous solution) were added dropwise. The temperature was maintained until a pale blue fluorescence appeared. The remaining 40% of the emulsifier aqueous solution was mixed with the remaining 90% of the mixed monomer and added dropwise to the reaction vessel, with the same amount of potassium persulfate aqueous solution added simultaneously. The reaction was maintained at 81°C for 60 minutes. The temperature was lowered to 45℃, the pH was adjusted to 7.4 with 20% ammonia, 0.25wt% propylene glycol methyl ether acetate was added, and the mixture was stirred for 20 minutes. After filtration through a 100-mesh nylon filter, an organosilicon-modified waterborne acrylic emulsion with a solid content of 42% and a particle size of 110±20nm was obtained.

[0039] S3: Preparation of Component A Weigh the raw materials according to the following mass proportions: 26.8 parts acrylic acid, 7.2 parts metal composite oxide (nano MgO and nano Al2O3 mass ratio 2.8:1), 1.4 parts composite crosslinking agent (pentaerythritol triacrylate and N-hydroxymethylacrylamide mass ratio 1:1), 10.5 parts of the above organosilicon acryloyloxy prepolymer, 2.3 parts composite accelerator (N,N-dimethylaniline and dimethylethanolamine mass ratio 1:1.2), 0.4 parts wetting and dispersing agent (polycarboxylate), and 51.4 parts deionized water.

[0040] Add 78% (by weight of component A) of deionized water to the reactor, then add the organosilicon acryloyloxy prepolymer and stir at 350 rpm until homogeneous. Maintain the temperature ≤38℃, add acrylic acid dropwise, and stir until the pH reaches 2.5. Add the metal composite oxide in four batches, 9 minutes apart, stirring until the system is completely transparent and the pH rises to 4.5. Dissolve the remaining deionized water, composite crosslinking agent, and wetting and dispersing agent at 72℃, then pump the solution into the reactor and maintain the temperature at 50℃ for 55 minutes. Cool to 24℃, add the composite accelerator, and stir until the viscosity reaches 23 mPa·s and the pH is 5.0. Filter through a 100-mesh filter to obtain component A.

[0041] S4: Preparation of Component B Weigh the raw materials according to the following mass ratios: 8.6 parts of compound carbonate (NaHCO3 to NH4HCO3 mass ratio 3.0:1), 14.3 parts of the above-mentioned organosilicon-modified waterborne acrylic emulsion, 3.7 parts of compound initiator (potassium persulfate to sodium persulfate double salt mass ratio 2.0:1), 0.3 parts of retarder (sodium bisulfite), and 73.1 parts of deionized water.

[0042] At 25°C, the composite carbonate was added to deionized water and stirred at 280 rpm until completely dissolved. The silicone-modified waterborne acrylic emulsion was added, and stirring continued for 15 minutes until homogeneous. The composite initiator was added in three batches, with a 7-minute interval between each batch, and stirred for 3 minutes after each batch until completely dissolved. Finally, the retarder was added, and stirring was carried out for 8 minutes. The viscosity was measured to be 24 mPa·s. The mixture was filtered through a 100-mesh nylon filter, placed in a brown, light-proof polyethylene sealed container, and stored in a sealed container to obtain component B.

[0043] S5: On-site mixing Component A and component B were loaded into the two hoppers of the grouting pump at a weight ratio of 1:1 and connected to a 12-section static mixer. The pump speed was adjusted to ensure that components A and B were pumped into the mixer synchronously, with the fluid flow rate controlled at 0.8 m / s and the mixing time approximately 7.5 minutes, resulting in the grouting gel material. The mixed slurry was a uniform milky white liquid, without stratification or streaks.

[0044] The performance of the grouting gel material prepared in this embodiment was tested, and the test results are shown in Table 1.

[0045] Example 2 S1: Preparation of organosilicon acryloyloxy prepolymer Same as step S1 in Example 1, namely: dehydrate the polyether triol under vacuum of -0.094 MPa and 82°C until the water content is ≤0.08%; cool down to 62°C, add HDI and stannous octoate in the ratio of polyether triol:HDI:stannous octoate = 1:4.0:0.01, heat up to 78°C and react until the -NCO content is 8.2%; cool down to 72°C, add KH570 dropwise in the ratio of KH570:polyether triol = 4.0:1, and react until the -NCO content is 3.5%; after cooling down, add 0.2% p-hydroxyanisole, filter, and store in a sealed container.

[0046] S2: Preparation of silicone-modified waterborne acrylic emulsion Same as step S2 in Example 1, namely: 32 parts of butyl acrylate, 18 parts of methyl methacrylate, 7.5 parts of hydroxypropyl acrylate, 5.5 parts of vinyltrimethoxysilane, and 4 parts of acrylic acid are mixed to obtain a mixed monomer; during the seed polymerization stage, 10% of the mixed monomer and 1.0% of the total mass of the mixed monomer in a potassium persulfate aqueous solution (5wt%) are added dropwise, and the mixture is kept at 81°C for 60 min; the pH is adjusted to 7.4, 0.25wt% of propylene glycol methyl ether acetate is added, and the mixture is filtered to obtain an organosilicon-modified waterborne acrylic emulsion with a solid content of 44% and a particle size of 110nm±20nm.

[0047] S3: Preparation of Component A Weigh the raw materials according to the following mass proportions: 35.7 parts acrylic acid, 8.9 parts metal composite oxide (nano MgO and nano Al2O3 mass ratio 2.8:1), 1.8 parts composite crosslinking agent (pentaerythritol triacrylate and N-hydroxymethylacrylamide mass ratio 1:2), 13.2 parts of the above organosilicon acryloyloxy prepolymer, 4.1 parts composite accelerator (N,N-dimethylaniline and dimethylethanolamine mass ratio 1:1.3), 0.5 parts wetting and dispersing agent (polycarboxylate), and 48.8 parts deionized water.

[0048] Add 78% (by weight of component A) of deionized water to the reactor, then add the organosilicon acryloyloxy prepolymer and stir at 350 rpm until homogeneous. Maintain the temperature ≤38℃, add acrylic acid dropwise, and stir until the pH reaches 2.5. Add the metal composite oxide in four batches, 9 minutes apart, stirring until the system is completely transparent and the pH rises to 4.5. Dissolve the remaining deionized water, composite crosslinking agent, and wetting and dispersing agent at 72℃, then pump the solution into the reactor and maintain the temperature at 50℃ for 55 minutes. Cool to 24℃, add the composite accelerator, and stir until the viscosity reaches 25 mPa·s and the pH reaches 5.0. Filter to obtain component A.

[0049] S4: Preparation of Component B Weigh the raw materials according to the following mass ratios: 11.8 parts of compound carbonate (NaHCO3 to NH4HCO3 mass ratio 3.0:1), 17.5 parts of the above-mentioned organosilicon-modified waterborne acrylic emulsion, 6.9 parts of compound initiator (potassium persulfate to sodium persulfate double salt mass ratio 2.0:1), 0.4 parts of retarder (sodium bisulfite), and 63.4 parts of deionized water.

[0050] At 25°C, the composite carbonate was added to deionized water and stirred at 280 rpm until completely dissolved. The silicone-modified waterborne acrylic emulsion was added and stirred for 15 minutes until homogeneous. The composite initiator was added in three batches, 7 minutes apart, with stirring for 3 minutes after each batch until completely dissolved. Finally, the retarder was added and stirred for 8 minutes. The viscosity was measured to be 26 mPa·s. The mixture was filtered, stored in a brown, light-proof, sealed container, and the product was component B.

[0051] S5: On-site mixing Component A and component B were loaded into the two hoppers of the grouting pump at a weight ratio of 0.95:1, connected to a 12-section static mixer, and the flow rate was adjusted to 0.8 m / s. The mixing time was approximately 7.5 min to obtain the grouting gel material. The mixed slurry was a uniform milky white liquid.

[0052] The performance of the grouting gel material prepared in this embodiment was tested, and the test results are shown in Table 1.

[0053] Example 3 S1: Preparation of organosilicon acryloyloxy prepolymer Same as step S1 in Example 1.

[0054] S2: Preparation of silicone-modified waterborne acrylic emulsion Same as step S2 in Example 1.

[0055] S3: Preparation of Component A Weigh the raw materials according to the following parts by weight: 23.5 parts of acrylic acid, 6.5 parts of metal composite oxide (nano MgO and nano Al2O3 mass ratio 2.6:1), 1.2 parts of composite crosslinking agent (pentaerythritol triacrylate and N-hydroxymethylacrylamide mass ratio 1:0.8), 9.6 parts of the above organosilicon acryloyloxy prepolymer, 1.5 parts of composite accelerator (N,N-dimethylaniline and dimethylethanolamine mass ratio 1:1.1), 0.3 parts of wetting and dispersing agent (polycarboxylate), and 67.4 parts of deionized water.

[0056] The preparation steps are the same as S3 in Example 2, except that after the heat preservation reaction, the composite accelerator is added, and the mixture is stirred until the viscosity is 20 mPa·s and the pH is 5.0. After filtration, component A is obtained.

[0057] S4: Preparation of Component B Weigh the raw materials according to the following mass ratios: 7.5 parts of compound carbonate (NaHCO3 to NH4HCO3 mass ratio 2.8:1), 12.8 parts of the above-mentioned organosilicon-modified waterborne acrylic emulsion, 2.9 parts of compound initiator (potassium persulfate to sodium persulfate double salt mass ratio 1.8:1), 0.2 parts of retarder (sodium bisulfite), and 76.6 parts of deionized water.

[0058] The preparation steps are the same as S4 in Example 2. The final measured viscosity is 21 mPa·s. After filtration, the product is stored in a brown, light-proof, sealed container to obtain component B.

[0059] S5: On-site mixing Component A and component B are mixed at a weight ratio of 1.05:1, and the rest is the same as S5 in Example 2, to obtain the grouting gel material.

[0060] The performance of the grouting gel material prepared in this embodiment was tested, and the test results are shown in Table 1.

[0061] Example 4 S1: Preparation of organosilicon acryloyloxy prepolymer Same as step S1 in Example 1.

[0062] S2: Preparation of silicone-modified waterborne acrylic emulsion Same as step S2 in Example 1.

[0063] S3: Preparation of Component A Weigh the raw materials according to the following parts by weight: 31.2 parts of acrylic acid, 9.3 parts of metal composite oxide (nano MgO and nano Al2O3 mass ratio 2.8:1), 1.7 parts of composite crosslinking agent (pentaerythritol triacrylate and N-hydroxymethylacrylamide mass ratio 1:1), 12.6 parts of the above-mentioned organosilicon acryloyloxy prepolymer, 3.8 parts of composite accelerator (N,N-dimethylaniline and dimethylethanolamine mass ratio 1:1.2), 0.6 parts of wetting and dispersing agent (polycarboxylate), and 50.8 parts of deionized water.

[0064] The preparation steps are the same as S3 in Example 2. Stir until the viscosity is 27 mPa·s and the pH is 5.0, then filter to obtain component A.

[0065] S4: Preparation of Component B Weigh the raw materials according to the following mass ratios: 12.7 parts of compound carbonate (NaHCO3 to NH4HCO3 mass ratio 3.0:1), 16.9 parts of the above-mentioned organosilicon-modified waterborne acrylic emulsion, 7.2 parts of compound initiator (potassium persulfate to sodium persulfate double salt mass ratio 2.0:1), 0.5 parts of retarder (sodium bisulfite), and 62.7 parts of deionized water.

[0066] The preparation steps were the same as in Example 2 S4. The final viscosity was measured to be 28 mPa·s. The sample was filtered, stored in a brown, light-proof, sealed container, and component B was obtained.

[0067] S5: On-site mixing Component A and component B are mixed at a weight ratio of 0.9:1, and the rest is the same as S5 in Example 2, to obtain the grouting gel material.

[0068] The performance of the grouting gel material prepared in this embodiment was tested, and the test results are shown in Table 1.

[0069] Example 5 S1: Preparation of organosilicon acryloyloxy prepolymer Same as step S1 in Example 1.

[0070] S2: Preparation of silicone-modified waterborne acrylic emulsion Same as step S2 in Example 1.

[0071] S3: Preparation of Component A Weigh the raw materials according to the following parts by weight: 29.4 parts of acrylic acid, 8.1 parts of metal composite oxide (nano MgO and nano Al2O3 mass ratio 3.0:1), 1.5 parts of composite crosslinking agent (pentaerythritol triacrylate and N-hydroxymethylacrylamide mass ratio 1:1), 11.3 parts of the above-mentioned organosilicon acryloyloxy prepolymer, 2.9 parts of composite accelerator (N,N-dimethylaniline and dimethylethanolamine mass ratio 1:1.2), 0.4 parts of wetting and dispersing agent (polycarboxylate), and 56.4 parts of deionized water.

[0072] The preparation steps are the same as S3 in Example 2. Stir until the viscosity is 22 mPa·s and the pH is 5.0, then filter to obtain component A.

[0073] S4: Preparation of Component B Weigh the raw materials according to the following mass ratios: 10.2 parts of compound carbonate (NaHCO3 to NH4HCO3 mass ratio 3.2:1), 15.7 parts of the above-mentioned organosilicon-modified waterborne acrylic emulsion, 5.3 parts of compound initiator (potassium persulfate to sodium persulfate double salt mass ratio 2.2:1), 0.4 parts of retarder (sodium bisulfite), and 68.4 parts of deionized water.

[0074] The preparation steps are the same as S4 in Example 2. The final measured viscosity is 23 mPa·s. After filtration, the product is stored in a brown, light-proof, sealed container to obtain component B.

[0075] S5: On-site mixing Component A and component B are mixed at a weight ratio of 1.1:1, and the rest is the same as S5 in Example 2, to obtain the grouting gel material.

[0076] The performance of the grouting gel material prepared in this embodiment was tested, and the test results are shown in Table 1.

[0077] Table 1 Test results of Examples 1-5 of the present invention

[0078] The organosilicon-modified two-component acrylate grouting gel materials prepared in Examples 1-5 of this invention all exhibit excellent comprehensive performance. The viscosity of the mixed grout is ≤35 mPa·s, meeting the requirements for microcrack penetration; the early compressive strength at 6 hours is ≥450 kPa, enabling rapid water plugging; the compressive strength of the solidified sand body at 28 days is ≥550 kPa, demonstrating excellent structural strength; the volume shrinkage rate at 28 days is ≤6.5%, effectively preventing secondary cracking; and the bond strength with the concrete substrate is ≥1.75 MPa, indicating good bond durability.

[0079] Regarding corrosion resistance, all embodiments exhibited strength retention rates of ≥87% and ≥92% after immersion in 5% H2SO4 and 5% NaOH solutions for 7 days, respectively, and a strength retention rate of ≥88% after immersion in 5% NaCl solution for 12 months, demonstrating their ability to withstand harsh service environments such as high salt spray and strong acids and alkalis. In terms of storage stability, after 8 months of storage at 25°C, the viscosity change rate was within ±3%, and the gelation time change was within ±2 minutes, with no significant performance fluctuations. The storage stability far exceeds that of existing similar materials.

[0080] Furthermore, experimental results show that the dosage of organosilicon acryloyloxy prepolymer and organosilicon-modified waterborne acrylic emulsion is positively correlated with the strength and corrosion resistance of the material. Appropriately increasing the dosage of both can improve the mechanical properties and resistance to extreme environments of the material without causing a significant increase in the viscosity of the slurry. By adjusting the dosage of composite accelerator and retarder, the gelation time can be precisely controlled within the range of 12 to 22 minutes to adapt to the construction rhythm of different engineering scenarios.

[0081] In summary, the organosilicon-modified two-component acrylate grouting gel material prepared by this invention achieves a synergistic effect of low viscosity, high early strength, low shrinkage, high corrosion resistance, and high adhesion. Moreover, the preparation process is controllable, the storage stability is good, and the consistency of industrial mass production is high. It can be widely used in the treatment of seepage water in complex working conditions such as underground tunnels, municipal pipe corridors, water conservancy dams, and chemical infrastructure. It effectively solves the technical problems of insufficient resistance to extreme environments, poor adhesion durability, and short storage period of existing acrylate grouting materials.

[0082] The above content is only for illustrating the technical concept of the present invention and should not be construed as limiting the scope of protection of the present invention. Any modifications made to the technical solution based on the technical concept proposed in this invention shall fall within the scope of protection of the claims of this invention.

Claims

1. A silicone-modified two-component acrylate grouting gel material, characterized in that, It includes component A and component B, wherein component A and component B are mixed in a weight ratio of 0.9:1 to 1.1:1; Component A comprises the following raw materials in parts by weight: 22-38 parts acrylic acid, 6-9.5 parts metal composite oxide, 1.1-1.9 parts composite crosslinking agent, 9-14 parts organosilicon acryloyloxy prepolymer, 1.2-4.8 parts composite accelerator, 0.3-0.6 parts wetting and dispersing agent, and 48-75 parts deionized water; Component B comprises the following raw materials in parts by weight: 7-13 parts of composite carbonate, 12-18 parts of organosilicon-modified waterborne acrylic emulsion, 2.5-7.5 parts of composite initiator, 0.2-0.5 parts of retarder, and 62-78 parts of deionized water.

2. The organosilicon-modified two-component acrylate grouting gel material according to claim 1, characterized in that, The metal composite oxide is a mixture of nano-MgO and nano-Al2O3 in a mass ratio of 2.5~3.2:1; the composite crosslinking agent is a mixture of pentaerythritol triacrylate and N-hydroxymethylacrylamide in a mass ratio of 1:(0.8~1.2); the composite accelerator is a mixture of N,N-dimethylaniline and dimethylethanolamine in a mass ratio of 1:(1.1~1.3).

3. The organosilicon-modified two-component acrylate grouting gel material according to claim 1, characterized in that, The composite carbonate is a mixture of NaHCO3 and NH4HCO3 in a mass ratio of 2.8~3.3:1; the composite initiator is a mixture of potassium persulfate and potassium sodium persulfate double salt in a mass ratio of 1.8~2.2:1; the retarder is sodium bisulfite; and the wetting and dispersing agent is a polycarboxylate wetting and dispersing agent.

4. The organosilicon-modified two-component acrylate grouting gel material according to claim 1, characterized in that, The number-average molecular weight of the organosilicon acryloyloxy prepolymer is 1800~2500, and the shelf life is ≥8 months; the solid content of the organosilicon-modified waterborne acrylic emulsion is 38%~46%, and the particle size is 90~130nm.

5. The organosilicon-modified two-component acrylate grouting gel material according to claim 1, characterized in that, The grout gel material, after mixing, has a viscosity of ≤35 mPa·s at 25℃, an adjustable gel time of 12~30 min, a 28-day volume shrinkage rate of ≤6.5%, and a bond strength with the concrete substrate of ≥1.75 MPa.

6. A method for preparing an organosilicon-modified two-component acrylate grouting gel material as described in any one of claims 1-5, characterized in that, Includes the following steps: S1, the organosilicon acryloyloxy prepolymer is dispersed in deionized water, and a mixed solution of acrylic acid, metal composite oxide, composite crosslinking agent and wetting and dispersing agent is added in sequence. After the reaction, a composite accelerator is added, and the mixture is stirred and filtered to obtain component A. S2, dissolve the composite carbonate in deionized water, add the organosilicon-modified waterborne acrylic emulsion, then add the composite initiator and retarder, and obtain component B by stirring and filtering; S3, Mix component A and component B at a weight ratio of 0.9:1 to 1.1:1 to obtain the grouting gel material.

7. The method for preparing an organosilicon-modified two-component acrylate grouting gel material according to claim 6, characterized in that, The preparation method of the organosilicon acryloyloxy prepolymer includes: dehydrating polyether triol to a water content ≤0.08% at 80~84℃ and a vacuum degree of -0.092~-0.096MPa; adding hexamethylene diisocyanate and stannous octoate at 60~64℃, and reacting at 76~80℃ until the -NCO content is 7.5%~9.0%; cooling to 70~74℃ and adding γ-methacryloyloxypropyltrimethoxysilane, and reacting until the -NCO content is 2.8%~4.5%; adding 0.15%~0.25% p-hydroxyanisole and then filtering.

8. The method for preparing an organosilicon-modified two-component acrylate grouting gel material according to claim 6, characterized in that, The preparation method of the organosilicon-modified waterborne acrylic emulsion includes: mixing 28-35 parts by weight of butyl acrylate, 15-22 parts by weight of methyl methacrylate, 6-9 parts by weight of hydroxypropyl acrylate, 4-7 parts by weight of vinyltrimethoxysilane, and 3-5 parts by weight of acrylic acid; adding an emulsifier aqueous solution accounting for 60% of the total emulsifier amount to a reaction vessel, heating to 78-82°C, adding 10% of the mixed monomers and 0.8-1.2% by weight of potassium persulfate aqueous solution accounting for the total mass of the mixed monomers, and maintaining the temperature until fluorescence appears; adding the remaining 40% of the emulsifier aqueous solution, the remaining 90% of the mixed monomers, and the same amount of potassium persulfate aqueous solution, and maintaining the temperature at 79-83°C for 55-60 minutes; adjusting the pH to 7.0-7.8, adding 0.2-0.3 wt% propylene glycol methyl ether acetate, and filtering.

9. The method for preparing an organosilicon-modified two-component acrylate grouting gel material according to claim 6, characterized in that, The preparation of component A is as follows: 75%~80% of deionized water is mixed with organosilicon acryloyloxy prepolymer and stirred at 340~360 rpm until homogeneous; the temperature is controlled at ≤38℃, and acrylic acid is added dropwise until the pH reaches 2.2~2.8; metal composite oxide is added in batches, with an interval of 8~10 min between each batch, until the system is transparent and the pH rises to 4.2~4.8; the remaining deionized water, composite crosslinking agent, and wetting and dispersing agent are dissolved at 70~74℃ and then pumped into a reactor, and the reaction is carried out at 48~52℃ for 50~60 min; the temperature is lowered to 22~26℃, composite accelerator is added, and the mixture is stirred until the viscosity reaches 18~28 mPa·s and the pH reaches 4.6~5.4, and then filtered.

10. The method for preparing an organosilicon-modified two-component acrylate grouting gel material according to claim 6, characterized in that, The preparation of component B is as follows: at ≤30℃, the composite carbonate is added to deionized water and stirred until completely dissolved; organosilicon-modified waterborne acrylic emulsion is added and stirred until homogeneous; the composite initiator is added in batches, with an interval of 6~8 min between each batch; finally, the retarder is added and stirred until the viscosity is 19~29 mPa·s; the mixture is filtered and stored in a brown, light-proof, sealed container; when using, component A and component B are mixed through a static mixer with ≥12 mixing elements, a fluid flow rate of 0.5~1.0 m / s, and a mixing time of 6~9 min.

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