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CN-122011647-A - Grouting material for blocking fluid with strong osmotic pressure and preparation method thereof

CN122011647ACN 122011647 ACN122011647 ACN 122011647ACN-122011647-A

Abstract

The invention relates to the field of grouting materials, in particular to a grouting material for blocking fluid with strong osmotic pressure and a preparation method thereof, and the grouting material comprises, by weight, 20-40 parts of a component A, 30-50 parts of a component B, 20-40 parts of a component C, wherein the component A is modified resin microspheres, the component B comprises, by weight, 50-70 parts of epoxy resin, 10-20 parts of an active diluent and 5-10 parts of an anti-dispersant agent, and the component C comprises, by weight, 40-60 parts of an amine curing agent, 2-5 parts of an accelerator and 10-20 parts of a toughening agent. The grouting material takes modified resin microspheres with three-layer structures as core components, and realizes multi-scale plugging of cracks through the functional division and cooperation of different levels.

Inventors

  • LI YAHUI
  • QIN SHILING
  • TANG CHAO
  • FENG DELONG
  • QIN RUNZE
  • ZHAO YING
  • LI ZONGYI

Assignees

  • 内蒙古京润矿安科技有限公司

Dates

Publication Date
20260512
Application Date
20260325

Claims (10)

  1. 1. The grouting material for blocking the fluid with high osmotic pressure is characterized by comprising the following raw materials in parts by weight: 20-40 parts of component A, 30-50 parts of component B and 20-40 parts of component C; The component A is modified resin microspheres; The component B comprises, by weight, 50-70 parts of epoxy resin, 10-20 parts of reactive diluent and 5-10 parts of anti-dispersant; The component C comprises 40-60 parts of amine curing agent, 2-5 parts of accelerator and 10-20 parts of toughening agent according to parts by weight.
  2. 2. The grouting material for blocking a strong osmotic pressure fluid according to claim 1, wherein the modified resin microsphere comprises a core material, an intermediate layer and an outer shell layer; The core material is prepared from the following raw materials of acrylic acid, acrylamide, N' -methylene bisacrylamide, potassium persulfate, liquid paraffin and sorbitan oleate; The intermediate layer is prepared from acrylic acid, dimethylaminoethyl methacrylate, N' -methylenebisacrylamide, ammonium persulfate, ethanol aqueous solution and sodium dodecyl sulfate; The shell layer is prepared from dibutyltin dilaurate, triethylenediamine, polyvinyl alcohol, nano silicon dioxide, ethanol, isophoronediamine, toluene diisocyanate and diethylenetriamine.
  3. 3. The grouting material for blocking a strong osmotic pressure fluid according to claim 2, wherein the modified resin microsphere is prepared by the steps of: (1) Adding sodium hydroxide solution into acrylic acid, adding acrylamide and N, N' -methylene bisacrylamide, stirring and dissolving to obtain aqueous phase solution, mixing liquid paraffin and sorbitan oleate to obtain oil phase solution, dripping the aqueous phase solution into the oil phase solution under the protection of nitrogen, dispersing 30 min, adding potassium persulfate, reacting at 60-65 ℃ for 3-4 h, cooling to room temperature after the reaction is finished, filtering, washing to neutrality, and vacuum drying to obtain core layer microspheres; (2) Dispersing the core layer microsphere in ethanol water solution containing sodium dodecyl sulfate, stirring at room temperature for 30min, adding uniformly mixed acrylic acid, dimethylaminoethyl methacrylate and N, N' -methylenebisacrylamide, stirring for 2 h, heating to 50-60 ℃, introducing nitrogen gas for 30-min, adding ammonium persulfate, reacting for 3-4 h, filtering, washing, and vacuum drying after the reaction is finished to obtain microsphere with an intermediate layer; (3) Adding ethanol, dibutyl tin dilaurate, triethylenediamine and nano silicon dioxide into a polyvinyl alcohol solution, performing ultrasonic dispersion to obtain a catalyst solution, reacting isophorone diamine with ketone compounds to prepare ketoiminated isophorone diamine, adopting a coaxial microfluidic chip, dissolving ketoiminated isophorone diamine as an internal phase, dissolving toluene diisocyanate in an organic solvent as an intermediate phase, taking an aqueous solution containing an emulsifier as an external phase, forming coaxial jet flow at the outlet of a microchannel by three streams, shearing to form liquid drops, washing and drying to obtain microcapsules, placing microspheres with the intermediate layer into a fluidized bed, spraying the catalyst solution into the fluidized bed, continuously performing fluidization and drying after spraying, conveying microcapsule dry powder into the fluidized bed, mixing with the microspheres, spraying glutaraldehyde dilute solution, and drying to obtain modified resin microspheres.
  4. 4. The grouting material for blocking a strong osmotic pressure fluid according to claim 3, wherein in the step (1), comprising, in parts by weight, 60-80 Parts of acrylic acid, 20-40 parts of acrylamide, 0.3-0.8 part of N, N' -methylene bisacrylamide, 0.2-0.5 part of potassium persulfate, 200-300 parts of liquid paraffin and 5-10 parts of sorbitan oleate.
  5. 5. The grouting material for blocking a strong osmotic pressure fluid according to claim 3, wherein in the step (2), based on 100 parts by weight of the core layer microsphere coated, comprising, 10-20 Parts of acrylic acid, 10-20 parts of dimethylaminoethyl methacrylate, 0.1-0.3 part of N, N' -methylenebisacrylamide, 0.1-0.2 part of ammonium persulfate, 200-220 parts of ethanol aqueous solution and 0.1-0.5 part of sodium dodecyl sulfate.
  6. 6. The grouting material for blocking a strong osmotic pressure fluid according to claim 3, wherein the amount ratio of the microspheres, the catalyst solution and the microcapsules having the intermediate layer in the step (3) is 100g (50-100) mL (10-20) g.
  7. 7. The grouting material for blocking high osmotic pressure fluid according to claim 1, wherein the epoxy resin is bisphenol F type epoxy resin or alicyclic epoxy resin; the reactive diluent is benzyl glycidyl ether or 1, 4-butanediol diglycidyl ether; The anti-dispersant is formed by copolymerizing acrylamide, a hydrophobic monomer (such as hexadecyl allyl dimethyl ammonium chloride) and 2-acrylamide-2-methylpropanesulfonic acid.
  8. 8. The grouting material for blocking high osmotic pressure fluid according to claim 1, wherein the amine curing agent is polyetheramine or modified aliphatic amine; The promoter is salicylic acid or dimethylaminomethyl phenol; The toughening agent is amino-terminated liquid nitrile rubber or polypropylene glycol diglycidyl ether.
  9. 9. The grouting material for blocking strong osmotic pressure fluid according to claim 1, wherein the B component is prepared by stirring epoxy resin, reactive diluent and anti-dispersant for 1-2 hours at 40-50 ℃ to obtain the B component; the component C is prepared by stirring an amine curing agent, a promoter, a toughening agent and water for 0.5-1h at room temperature.
  10. 10. A method for preparing a grouting material for blocking a fluid under strong osmotic pressure according to any one of claims 1 to 9, comprising the steps of mixing the component A, the component B and the component C, and stirring uniformly to obtain the grouting material.

Description

Grouting material for blocking fluid with strong osmotic pressure and preparation method thereof Technical Field The invention relates to the field of grouting materials, in particular to a grouting material for blocking fluid with strong osmotic pressure and a preparation method thereof. Background With the development of underground engineering construction of traffic tunnels, mining, hydroelectric dam foundations and the like in China, the hydrogeological conditions faced by the engineering are increasingly complex. High osmotic pressure (> 2 MPa), high flow (> 100m 3/h) and high flow rate (> 1 m/s) are key problems restricting engineering safety construction and operation. At present, grouting plugging materials applied to high osmotic pressure environments are mainly divided into three types, namely cement-based materials, chemical slurry and expansion polymer materials. However, all three materials have technical defects which are difficult to overcome, and the plugging requirements in the complex dynamic water environment cannot be completely met. The cement-based material (such as the water-running anti-dispersion grouting material disclosed in patent CN 119797865A) takes ordinary Portland cement as a main body, and the retention rate in water is improved by adding an anti-dispersing agent. Although the materials have low cost and wide sources, the materials are particle type slurry materials with larger particle size, are difficult to inject into micro cracks with the width smaller than 0.1mm, and have severely limited injectability. Meanwhile, the strength development is slow (the 28d compressive strength is more than 15 MPa), the secondary damage is easy to occur under the scouring of high-pressure dynamic water, and the long-acting blocking is difficult to realize. Chemical grout materials (represented by low viscosity polymers such as epoxy resin, polyurethane, and acrylate) are widely used for fine crack sealing due to their excellent injectability and permeability. For example, the low-viscosity epoxy resin can be injected into micro cracks with the permeability coefficient K more than or equal to 10- 6 cm/s, and has high mechanical strength and good bonding performance after curing. However, the existing chemical slurry materials have obvious defects in a high-osmotic-pressure dynamic water environment that firstly, most chemical slurry is a hydrophobic system, water is easy to dilute, emulsify or run off, the dispersion resistance is poor, the retention rate is often lower than 50% under dynamic water scouring, secondly, the curing shrinkage rate is higher (especially polyurethane), a seepage channel is easily formed at the interface between a plugging body and a rock wall, thirdly, the toughness is insufficient, the cured chemical slurry is brittle, the micro deformation of surrounding rock is difficult to adapt to under the high-osmotic-pressure environment, secondary cracking is easy to occur, fourthly, the viscosity of part of chemical slurry (such as traditional epoxy resin) is higher, a large amount of organic diluent is required to be added, the environment friendliness is affected, and the construction safety risk is increased. The expansion polymer material (such as the ultra-high expansion grouting material disclosed in patent CN 110835449B) realizes physical plugging by expanding in water, the expansion rate can reach more than 200 times, and the expansion polymer material has obvious advantages in the aspect of plugging wide cracks. However, the material has three inherent defects that firstly, the expansion performance is obviously affected by water quality, in complex environments such as acidic pit water, high mineralization degree groundwater and the like, the expansion rate fluctuation can reach more than 50%, the plugging effect is difficult to predict, secondly, the expansion rate is uncontrollable, the grouting pipeline is easy to be plugged by instantaneous severe expansion after meeting water, the construction is failed, thirdly, the curing trigger mechanism is single, the curing trigger mechanism is controlled only by time or is in water meeting reaction, the reinforcing time cannot be intelligently adjusted according to crack development and stress variation, and the formed plugging body is insufficient in integrity and durability. In summary, most of the existing grouting materials are in a static single mode in structural design, lack dynamic response capability to environmental parameters such as underground water pressure, flow velocity, water quality, temperature and the like, and are difficult to realize stable, controllable and long-acting plugging effects in complex and changeable high-osmotic-pressure environments. How to break through the performance bottleneck of the existing material, develop an intelligent grouting material which can actively adapt to environmental changes and realize multi-scale collaborative plugging, and become a technical problem to