Lightweight high-adhesion underwater epoxy grouting material and preparation method thereof

Abstract

The application provides a light-weight high-adhesion underwater epoxy grouting material and a preparation method thereof. The underwater epoxy grouting material comprises a component A and a component B. The component A comprises the following components in parts by mass: 60-100 parts of an epoxy resin, 1-5 parts of a modifier, 1-10 parts of a thixotropic agent, 50-100 parts of a filler, 1-5 parts of a toughening agent, and 1-5 parts of a coupling agent. The filler comprises mortar filler and hollow glass microbeads. The component B comprises the following components in parts by mass: 20-60 parts of an underwater curing agent and 1-10 parts of an accelerator. The light-weight high-adhesion underwater epoxy grouting material can effectively reduce the specific gravity of the underwater epoxy grouting material in water through the hollow glass microbeads, and the hollow glass microbeads and the thixotropic agent can effectively improve the adhesion of the underwater epoxy grouting material to concrete. When the underwater epoxy grouting material is used to fill the defects of concrete in water, the underwater epoxy grouting material does not need to be fixed and will not flow off due to poor underwater adhesion or high specific gravity.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of underwater epoxy grouting materials, in particular, relates to a kind of lightweight high adhesion underwater epoxy grouting material and preparation method. BACKGROUND

[0002] With the development and application of marine resources, underwater engineering construction is also more and more, underwater concrete construction due to seawater scouring and erosion, etc. A large number of defects, such as bridges, wharfs, dams, etc. Due to the impact of sea waves, typhoon, ship scratches, and seawater penetration corrosion, the underwater part of the building or the sea wave scouring area produces concrete spalling, erosion, corrosion, exposed steel corrosion and other defects, which seriously affects the safety of the building. These structures are immersed in seawater for a long time, and it is difficult to repair them in dry conditions, so various underwater epoxy adhesives using epoxy resin as the basic raw material are widely used in underwater concrete damage and crack repair treatment.

[0003] The existing underwater epoxy grouting material is mainly composed of resin, curing agent and filler. In order to increase the strength of the underwater adhesive, quartz sand, quicklime and cement are used as fillers, and the slurry prepared by compounding them has a large density. When repairing damaged parts, sleeve or template must be used to fix the construction site, and then the slurry is poured in. For example, patent CN201711423774.5 provides a high-strength high-fluidity epoxy resin grouting material and a preparation method thereof. The main filler is quartz sand with different densities, and the overall slurry has a large density and high fluidity, so sleeve structure must be used for repair.

[0004] The existing underwater epoxy grouting material must be fixed by sleeve or template when repairing damaged parts. If there is no fixed state, the slurry will flow off due to insufficient underwater adhesion or too large specific gravity.

[0005] Therefore, the present application is proposed. SUMMARY

[0006] The purpose of the present application is to provide a lightweight high adhesion underwater epoxy grouting material and a preparation method, to solve the problem that the existing underwater epoxy grouting material in the prior art must be fixed by sleeve or template when repairing damaged parts, and the slurry will flow off due to insufficient underwater adhesion or too large specific gravity in the absence of fixed state.

[0007] To achieve the above purpose, the technical scheme of the present application is as follows:

[0008] A lightweight high adhesion underwater epoxy grouting material, the lightweight high adhesion underwater epoxy grouting material comprises component A and component B, the ratio of component A and component B is 1:1,

[0009] The A component comprises the following components by mass fraction: epoxy resin 60-100 parts, 1-5 parts of a modifier, thixotropic agent 1-10 parts, filler 50-100 parts, toughening agent 1-5 parts, coupling agent 1-5 parts, the filler comprising mortar type filler and hollow glass microbeads;

[0010] The B component comprises the following components by mass fraction: underwater curing agent 20-60 parts, accelerator 1-10 parts.

[0011] The underwater epoxy grouting material with light weight and high adhesion according to the present application uses epoxy resin to impart excellent adhesion, tensile strength and corrosion resistance to the grout, and hollow glass microbeads as filler, which on the one hand replaces part of the traditional mortar type filler, and on the other hand can effectively reduce the specific gravity of the underwater epoxy grouting material in water as a low-density material, and can also improve the viscosity of the underwater epoxy grouting material, and the hollow glass microbeads and the thixotropic agent together effectively improve the adhesion of the underwater epoxy grouting material to concrete; therefore, this underwater epoxy grouting material with low density and high adhesion can be used to fill the defects of concrete in water without the need for formwork or sleeve fixing, and can be effectively adhered to the surface of damaged concrete without the need for fixing, and can not flow off due to poor underwater adhesion or high specific gravity, and can effectively adhere to the surface of damaged concrete while having the effect of reinforcement and reinforcement; and can be used for the adhesion and repair of various narrow spaces and complex structure connecting surfaces of concrete underwater.

[0012] Therefore, there is a need for a concrete structure defect repair method that can be performed without fixing.

[0013] Further, the density of the hollow glass microbeads is 0.3-0.6 g / cm 3 , and the compressive strength is 30-100 MPa.

[0014] The density and compressive strength of the hollow glass microbeads are in the above ranges, which are the most suitable for reducing the specific gravity of the underwater epoxy grouting material in water, and also have the best effect of improving the viscosity of the underwater epoxy grouting material.

[0015] Further, the modifier is cage-type poly siesquioxane with epoxy groups.

[0016] The cage structure of the cage-type poly siesquioxane with epoxy groups can form a uniform and stable dispersed phase in the epoxy resin system, and can absorb fracture energy when the material is impacted, effectively improving the toughness of the epoxy resin; the cage-type poly siesquioxane with epoxy groups, hollow glass microbeads and carboxyl-terminated butyl nitrile rubber are synergistically toughened, and the grout has high toughness, compressive strength and underwater adhesion strength after complete curing.

[0017] Further, the epoxy resin is bisphenol A type epoxy resin or bisphenol F type epoxy resin.

[0018] Further, the toughening agent is carboxyl-terminated butyl nitrile rubber.

[0019] The toughening agent is carboxyl-terminated butyl nitrile rubber, which has the best synergistic toughening effect with hollow glass microspheres and cage-type polysilsesquioxane with epoxy groups.

[0020] Further, the thixotropic agent is organic montmorillonite.

[0021] When the thixotropic agent is organic montmorillonite, the viscosity of the epoxy resin can be most effectively improved, the hollow glass microspheres and the organic montmorillonite together increase the adhesion of the underwater epoxy grouting material to concrete underwater, and the addition of the organic montmorillonite can most effectively reduce the delamination of the hollow glass microspheres and improve the uniformity of the distribution of the hollow glass microspheres in the underwater epoxy grouting material.

[0022] Further, the underwater curing agent is a Mannich base modified amine curing agent, and the Mannich base modified amine curing agent is at least one of 1085A, 1085C and 810 curing agents.

[0023] Further, the accelerator is at least one of 2-ethyl-4-methylimidazole, 2-methylimidazole and DMP-30.

[0024] Further, the coupling agent is a silane coupling agent.

[0025] In a second aspect, the application provides a preparation method of the lightweight high-adhesion underwater epoxy grouting material, and any one of the lightweight high-adhesion underwater epoxy grouting materials is prepared by using the preparation method of the lightweight high-adhesion underwater epoxy grouting material, and the preparation method of the lightweight high-adhesion underwater epoxy grouting material comprises the following steps:

[0026] S1, preparation of the A component: first, a modifier and an epoxy resin are copolymerized according to mass fractions to obtain a modified epoxy resin, then the modified epoxy resin is added to a container, then a toughening agent and a coupling agent are added to the container according to mass fractions and stirred, and then a filler is added according to mass fractions after uniform stirring, and then a thixotropic agent is added after stirring to form a paste;

[0027] S2, preparation of the B component: an underwater curing agent and an accelerator are added to a container according to mass fractions and stirred;

[0028] S3, mixing the A component and the B component according to the ratio to obtain the lightweight high-adhesion underwater epoxy grouting material.

[0029] This invention proposes a lightweight, highly adhesive underwater epoxy grouting material and its preparation method. Compared with the prior art, the lightweight, highly adhesive underwater epoxy grouting material and its preparation method of this invention have the following beneficial effects:

[0030] 1) The lightweight, highly adhesive underwater epoxy grouting material and its preparation method described in this invention are interconnected and inseparable, comprising epoxy resin, underwater curing agent, hollow glass microspheres, organomontmorillonite, carboxylate-terminated nitrile butadiene rubber, and octa-epoxy cage-like silsesquioxane, achieving multiple effects: First, it effectively reduces the specific gravity of the underwater epoxy grouting material in water; second, it effectively improves the adhesion performance between the underwater epoxy grouting material and concrete; third, it can be directly used for underwater repair of concrete surfaces without the need for sleeves or formwork fixation, filling the concrete in water. When concrete defects are found, no fixing is required. It will not flow and fall off due to poor underwater adhesion or its own high specific gravity. It can effectively bond to the damaged concrete surface and also has a reinforcing effect. Fourth, it can reduce the delamination problem of hollow glass microspheres and improve the uniformity of distribution of hollow glass microspheres in underwater epoxy grouting materials. Fifth, after the grout is fully cured, it has high toughness, compressive strength and underwater adhesion strength. Sixth, it can be used for bonding and repairing various narrow spaces and complex joint surfaces of underwater concrete, and the production process is simple and easy to operate.

[0031] 2) The lightweight, high-adhesion underwater epoxy grouting material and its preparation method described in this invention utilize epoxy resin to impart excellent adhesion, tensile strength, and corrosion resistance to the grout. Hollow glass microspheres are used as fillers, replacing some traditional mortar fillers. As a low-density material, hollow glass microspheres effectively reduce the specific gravity of the underwater epoxy grouting material in water. Furthermore, hollow glass microspheres also increase the viscosity of the underwater epoxy grouting material. The combined effect of hollow glass microspheres and organomontmorillonite effectively improves the adhesion performance between the underwater epoxy grouting material and concrete. Therefore, this low-density, high-adhesion underwater epoxy grouting material can be directly used for underwater repair of concrete surfaces without the need for sleeves or templates. When filling concrete defects underwater, no fixing is required, and it will not flow and fall off due to poor underwater adhesion or its own high specific gravity, effectively adhering to the damaged concrete surface. It can be used for bonding and repairing various narrow spaces and complex structural connections in underwater concrete, and the production process is simple and easy to operate.

[0032] 3) The lightweight, high-adhesion underwater epoxy grouting material and its preparation method described in this invention use organic montmorillonite as a thixotropic agent, which can effectively increase the viscosity of epoxy resin and increase the adhesion between the underwater epoxy grouting material and concrete underwater. At the same time, the addition of organic montmorillonite can reduce the delamination problem of hollow glass microspheres and improve the uniformity of distribution of hollow glass microspheres in the underwater epoxy grouting material.

[0033] 4) The lightweight, high-adhesion underwater epoxy grouting material and its preparation method described in this invention use carboxylate-terminated nitrile rubber as a toughening agent. Under normal circumstances, adding carboxylate-terminated nitrile rubber will decrease the material modulus. However, since hollow glass microspheres are rigid particles, their modulus and the modulus of epoxy resin itself are very high. A small amount of carboxylate-terminated nitrile rubber has little impact on the material. Carboxylate-terminated nitrile rubber makes the impact fracture surface of the material rougher, and the impact strength of the underwater epoxy grouting material after curing increases, changing from brittle fracture to ductile fracture. Carboxylate-terminated nitrile rubber and hollow glass microspheres play a synergistic toughening role in the underwater epoxy grouting material.

[0034] 5) The lightweight, highly adhesive underwater epoxy grouting material and its preparation method described in this invention utilize cage-type silsesquiane (POSS), a type of organic-inorganic hybrid nanomaterial. Its core is a hollow cage-like structure composed of Si-O-Si, surrounded by organic groups. Because the inorganic core is coated with organic groups, it exhibits good compatibility with the resin matrix. Furthermore, the active functional groups on its surface can chemically polymerize into the polymer network. Simultaneously, the cage-like structure self-assembles within the resin matrix to form nanoclusters, significantly toughening the resin matrix. The epoxy resin is modified by copolymerizing cage-like polysilsesquioxanes with epoxy groups. The cage-like structure of the epoxy-containing cage-like polysilsesquioxanes can form a uniform and stable dispersed phase in the epoxy resin system. When the material is subjected to impact, it can absorb fracture energy and effectively improve the toughness of the epoxy resin. At the same time, hollow glass microspheres and carboxylate-terminated nitrile rubber are added for synergistic toughening. After the slurry is fully cured, it has high toughness, compressive strength and underwater adhesion strength. Detailed Implementation

[0035] It should be noted that, unless otherwise specified, the embodiments and features described in the embodiments of the present invention can be combined with each other. The descriptions of "first," "second," etc., mentioned in the embodiments of the present invention are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0036] The present invention will now be described in detail with reference to embodiments.

[0037] A lightweight, highly adhesive underwater epoxy grouting material, comprising component A and component B, wherein the ratio of component A to component B is 1:1.

[0038] The A component comprises the following components by mass parts: 60-100 parts epoxy resin, 1-5 parts modifier, 1-10 parts thixotropic agent, 50-100 parts filler, 1-5 parts toughening agent, and 1-5 parts coupling agent. The filler includes mortar filler and hollow glass microspheres.

[0039] The B component comprises the following components by mass: 20-60 parts of underwater curing agent and 1-10 parts of accelerator.

[0040] Hollow glass microspheres, as a filler, firstly replace some traditional mortar fillers. As a low-density material, hollow glass microspheres can effectively reduce the specific gravity of underwater epoxy grouting materials in water. Secondly, hollow glass microspheres can increase the viscosity of underwater epoxy grouting materials, thereby improving the adhesion performance between underwater epoxy grouting materials and concrete. Thirdly, because hollow glass microspheres are rigid particles, their modulus is very high, similar to that of epoxy resin itself. A small amount of toughening agent has little impact on the material. The toughening agent roughens the impact fracture surface of the material, increasing the impact strength of the cured underwater epoxy grouting material, changing it from brittle fracture to ductile fracture. The toughening agent and hollow glass microspheres play a synergistic toughening role in the underwater epoxy grouting material.

[0041] However, adding hollow glass microspheres can cause stratification in the grout. Organo-montmorillonite, as a thixotropic agent, can effectively increase the viscosity of epoxy resin and enhance the adhesion between underwater epoxy grouting materials and concrete. The addition of organo-montmorillonite, on the one hand, works synergistically with hollow glass microspheres to effectively improve the adhesion between the underwater epoxy grouting material and concrete; on the other hand, it can reduce the stratification problem of hollow glass microspheres and improve the uniformity of their distribution in the underwater epoxy grouting material.

[0042] More specifically, the density of the hollow glass microspheres is 0.3–0.6 g / cm³. 3 The pressure resistance is 30-100 MPa. For example, 3M's K series or S series.

[0043] As for the hollow glass microspheres, since their specific structure and preparation method are existing technologies, they will not be described in detail here.

[0044] Specifically, the modifier is a cage-type polysilsesquioxane with epoxy groups.

[0045] Specifically, the cage-like polysilsesquioxane with epoxy groups is an octaepoxy cage-like silsesquioxane, but is not limited thereto.

[0046] Specifically, the epoxy resin is a bisphenol A type epoxy resin or a bisphenol F type epoxy resin.

[0047] Specifically, the underwater curing agent is a Mannich base modified amine curing agent.

[0048] Specifically, there are no restrictions on the specific type of Mannich base-modified amine curing agent.

[0049] More specifically, the Mannich base-modified amine curing agent is at least one of 1085A, 1085C and 810 curing agents.

[0050] Specifically, the promoter is at least one of 2-ethyl-4-methylimidazole, 2-methylimidazole, and DMP-30.

[0051] Specifically, the mortar filler is at least one of calcium carbonate and quartz sand.

[0052] More specifically, the calcium carbonate is 200-400 mesh, and the quartz sand is 200-400 mesh.

[0053] Specifically, the toughening agent is carboxylate-terminated nitrile butadiene rubber (CTBN).

[0054] More specifically, the coupling agent is a silane coupling agent.

[0055] Specifically, the silane coupling agent is not limited to any particular type.

[0056] More specifically, the silane coupling agent is KH550 or KH560.

[0057] In a second aspect, the present invention provides a method for preparing a lightweight, high-adhesion underwater epoxy grouting material. The lightweight, high-adhesion underwater epoxy grouting material described in any one of the present invention is prepared using the method described above. The method for preparing the lightweight, high-adhesion underwater epoxy grouting material includes the following steps:

[0058] S1. Preparation of component A: First, the modifier and epoxy resin are copolymerized in proportion to mass to obtain modified epoxy resin. Then, the obtained modified epoxy resin is added to a container, and toughening agent and coupling agent are added to the container in proportion to mass and stirred. After stirring evenly, filler is added in proportion to mass and stirred to form a paste. Then, thixotropic agent is added and stirred evenly.

[0059] S2. Preparation of component B: Add the underwater curing agent and accelerator to the container according to the mass fractions and stir until uniform;

[0060] S3. Mix component A and component B according to the specified ratio to obtain the lightweight, highly adhesive underwater epoxy grouting material.

[0061] Specifically, in step S1, the copolymerization reaction of the modifier and epoxy resin according to a certain mass ratio to obtain the modified epoxy resin includes the following steps: first, dissolving the cage-like polysilsesquioxane containing epoxy groups in a tetrahydrofuran solution; then, adding it to the epoxy resin according to a certain mass ratio, mixing and stirring; and finally, obtaining the modified epoxy resin after all the tetrahydrofuran solvent has evaporated. The modified epoxy resin obtained by copolymerizing the modifier and epoxy resin according to a certain mass ratio improves the underwater bonding strength and compressive strength of the underwater epoxy grouting material compared to the unmodified epoxy resin.

[0062] This invention provides a lightweight, highly adhesive underwater epoxy grouting material and its preparation method. The grout has the characteristics of rapid underwater curing, low specific gravity, strong adhesion to the concrete interface, and low dispersion underwater. It can be directly used for underwater repair of concrete surfaces without the need for sleeves or templates for fixation. It can be used for bonding and repairing various narrow spaces and complex joint surfaces of concrete underwater. Moreover, the production process is simple and easy to operate.

[0063] This invention relates to a lightweight, highly adhesive underwater epoxy grouting material and its preparation method. The epoxy resin, underwater curing agent, hollow glass microspheres, organomontmorillonite, carboxylate-terminated nitrile butadiene rubber, and octa-epoxy cage-like silsesquioxane are interconnected and inseparable, achieving multiple benefits: First, it effectively reduces the specific gravity of the underwater epoxy grouting material in water; second, it effectively improves the adhesion performance between the underwater epoxy grouting material and concrete; third, it can be directly used for underwater repair of concrete surfaces without the need for sleeves or templates for fixation. When filling concrete defects underwater, no fixation is required, and it will not flow and fall off due to poor underwater adhesion or its own high specific gravity, effectively adhering to the damaged concrete surface while also providing reinforcement; fourth, it reduces the delamination problem of hollow glass microspheres and improves the uniformity of their distribution in the underwater epoxy grouting material; fifth, the grout exhibits high toughness, compressive strength, and underwater adhesion strength after complete curing; sixth, it can be used for bonding and repairing various confined spaces and complex structural connections in underwater concrete, and the production process is simple and easy to operate.

[0064] Example 1

[0065] A lightweight, highly adhesive underwater epoxy grouting material, comprising component A and component B, wherein the ratio of component A to component B is 1:1.

[0066] The first component comprises the following components by mass: 60 parts epoxy resin, 3 parts modifier, 1.2 parts organomontmorillonite, 50 parts filler, 3 parts toughening agent, and 1.5 parts coupling agent. The filler includes mortar filler and hollow glass microspheres; wherein, 40 parts are mortar filler and 10 parts are hollow glass microspheres.

[0067] The B component comprises the following components by mass: 30 parts underwater curing agent and 0.2 parts accelerator.

[0068] Specifically, the modifier is an octaepoxy cage-like silsesquioxane.

[0069] Specifically, the epoxy resin is bisphenol A type epoxy resin E51.

[0070] Specifically, the underwater curing agent is a Mannich base modified amine curing agent.

[0071] More specifically, the Mannich base-modified amine curing agent is 1085A.

[0072] Specifically, the accelerator is DMP-30.

[0073] Specifically, the mortar filler is calcium carbonate.

[0074] More specifically, the calcium carbonate is 200 mesh.

[0075] More specifically, the density of the hollow glass microspheres is 0.3 g / cm³. 3 The compressive strength is 30 MPa. The hollow glass microspheres are 3M S-series hollow glass microspheres S42.

[0076] Specifically, the toughening agent is carboxylate-terminated nitrile butadiene rubber (CTBN).

[0077] More specifically, the coupling agent is a silane coupling agent.

[0078] More specifically, the silane coupling agent is KH560.

[0079] The preparation method of the lightweight, high-adhesion underwater epoxy grouting material includes the following steps:

[0080] S1. Preparation of component A: First, the modifier and epoxy resin are copolymerized in proportion to mass to obtain modified epoxy resin. Then, the obtained modified epoxy resin is added to a container, and toughening agent and coupling agent are added to the container in proportion to mass and stirred. After stirring evenly, filler is added in proportion to mass and stirred to form a paste. Then, thixotropic agent is added and stirred evenly.

[0081] S2. Preparation of component B: Add the underwater curing agent and accelerator to the container according to the mass fractions and stir until uniform;

[0082] S3. Mix component A and component B according to the specified ratio to obtain the lightweight, highly adhesive underwater epoxy grouting material.

[0083] Specifically, in step S1, the modified epoxy resin is obtained by copolymerizing the modifier and epoxy resin according to the mass fractions by the following steps: first, the octaepoxy cage-like silsesquioxane is dissolved in a tetrahydrofuran solution, and after dissolution, it is added to the epoxy resin according to the mass fractions, mixed and stirred, and after the tetrahydrofuran solvent has completely evaporated, the modified epoxy resin is obtained.

[0084] Example 2

[0085] In this embodiment, unlike in Embodiment 1, the filler is 70 parts, and the filler includes mortar-type filler and hollow glass microspheres; wherein, 60 parts are mortar-type filler and 10 parts are hollow glass microspheres.

[0086] Specifically, the mortar filler is quartz sand.

[0087] The quartz sand comprises 30 parts of 200-mesh quartz sand and 30 parts of 400-mesh quartz sand.

[0088] More specifically, the density of the hollow glass microspheres is 0.6 g / cm³. 3 The pressure resistance is 100MPa.

[0089] More specifically, the Mannich base-modified amine curing agent is 1085C.

[0090] Specifically, the promoter is 2-ethyl-4-methylimidazole.

[0091] Example 3

[0092] In this embodiment, unlike in Embodiment 1, the filler is 70 parts, and the filler includes mortar-type filler and hollow glass microspheres; wherein, 60 parts are mortar-type filler and 10 parts are hollow glass microspheres.

[0093] Specifically, the mortar filler is quartz sand.

[0094] The quartz sand comprises 30 parts of 200-mesh quartz sand and 30 parts of 400-mesh quartz sand.

[0095] More specifically, the density of the hollow glass microspheres is 0.5 g / cm³. 3 The compressive strength is 60MPa.

[0096] More specifically, the Mannich base-modified amine curing agent is 810 curing agent.

[0097] Specifically, the promoter is 2-methylimidazole.

[0098] Comparative Example 1

[0099] In this comparative example, unlike Example 3, the filler only includes mortar-type filler, without the addition of hollow glass microspheres or the modifier octaepoxy cage silsesquioxane.

[0100] Comparative Example 2

[0101] In this comparative example, unlike Example 3, no terminal carboxylic acid nitrile rubber was added.

[0102] Comparative Example 3

[0103] In this comparative example, unlike Example 3, no organomontmorillonite was added.

[0104] Comparative Example 4

[0105] In this comparative example, unlike Example 3, the filler only includes mortar-type filler and no hollow glass microspheres are added.

[0106] Comparative Example 5

[0107] In this comparative example, unlike Example 3, no modifier, octaepoxy cage-like silsesquioxane, was added.

[0108] Performance testing

[0109] The lightweight, highly adhesive underwater epoxy grouting materials prepared in Examples 1-3 and Comparative Examples 1-5 were subjected to performance tests, and the test results are shown in Table 1.

[0110] The lightweight, highly adhesive underwater epoxy grouting materials prepared in Examples 1-3 and Comparative Examples 1-5 were first prepared into compression specimens and bonding specimens. The compressive strength was then tested according to GB / T 2567-2008, with a compression rate of 1 mm / min on the testing machine. The underwater bonding strength was tested according to SL / T 807-2021, with a loading speed of 5 mm / min on the testing machine.

[0111] The preparation process of the compression sample is as follows: after the components A and B are mixed evenly according to the ratio, the mixture is poured into a silicone mold and cured in fresh water or seawater for 7 days.

[0112] The preparation process of the bonding specimen is as follows: “8” mortar blocks are prepared in accordance with SL / T 807-2021, and the demolded specimens are placed in fresh water or seawater at (20±3)℃ for 7 days.

[0113] Table 1

[0114]

[0115]

[0116] As shown in Table 1, the lightweight, highly adhesive underwater epoxy grouting material of this invention comprises epoxy resin, underwater curing agent, hollow glass microspheres, organomontmorillonite, carboxylate-terminated nitrile butadiene rubber, and octa-epoxy cage-like silsesquioxane, which are interconnected and inseparable, achieving multiple functions: First, it effectively reduces the specific gravity of the underwater epoxy grouting material in water; second, it effectively improves the adhesion performance between the underwater epoxy grouting material and concrete; third, it can be directly used for underwater repair of concrete surfaces without the need for sleeves or templates, and when filling concrete defects underwater, it does not require fixing and will not flow and fall off due to poor underwater adhesion or its own high specific gravity, effectively adhering to the damaged concrete surface; it can be used for bonding and repairing various narrow spaces and complex structural connections in underwater concrete, and the production process is simple and easy to operate; fourth, it can reduce the delamination problem of hollow glass microspheres and improve the uniformity of the distribution of hollow glass microspheres in the underwater epoxy grouting material; fifth, after the grout is fully cured, it has high toughness, compressive strength, and underwater adhesion strength.

[0117] While the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. A lightweight, highly adhesive underwater epoxy grouting material, characterized in that, The lightweight, highly adhesive underwater epoxy grouting material comprises component A and component B, with a mixing ratio of 1:

1. The A component comprises the following components by mass parts: 60-100 parts epoxy resin, 1-5 parts modifier, 1-10 parts thixotropic agent, 50-100 parts filler, 1-5 parts toughening agent, and 1-5 parts coupling agent. The filler includes mortar filler and hollow glass microspheres. The B component comprises the following components by mass: 20-60 parts of underwater curing agent and 1-10 parts of accelerator; The modifier is a cage-type polysilsesquioxane with epoxy groups; The toughening agent is carboxylate-terminated nitrile butadiene rubber; The thixotropic agent is an organomontmorillonite; The preparation method of the lightweight, high-adhesion underwater epoxy grouting material includes the following steps: S1. Preparation of component A: First, the modifier and epoxy resin are copolymerized in proportion to mass to obtain modified epoxy resin. Then, the obtained modified epoxy resin is added to a container, and toughening agent and coupling agent are added to the container in proportion to mass and stirred. After stirring evenly, filler is added in proportion to mass and stirred to form a paste. Then, thixotropic agent is added and stirred evenly. S2. Preparation of component B: Add the underwater curing agent and accelerator to the container according to the mass fractions and stir until uniform; S3. Mix component A and component B according to the specified ratio to obtain the lightweight, highly adhesive underwater epoxy grouting material.

2. The lightweight, highly adhesive underwater epoxy grouting material according to claim 1, characterized in that, The density of the hollow glass microspheres is 0.3–0.6 g / cm³. 3 The compressive strength is 30-100 MPa.

3. The lightweight, highly adhesive underwater epoxy grouting material according to claim 1, characterized in that, The epoxy resin is either bisphenol A type epoxy resin or bisphenol F type epoxy resin.

4. The lightweight, highly adhesive underwater epoxy grouting material according to claim 1, characterized in that, The underwater curing agent is a Mannich base-modified amine curing agent, and the Mannich base-modified amine curing agent is at least one of 1085A, 1085C and 810 curing agents.

5. The lightweight, highly adhesive underwater epoxy grouting material according to claim 1, characterized in that, The accelerator is at least one of 2-ethyl-4-methylimidazole, 2-methylimidazole, and DMP-30.

6. The lightweight, highly adhesive underwater epoxy grouting material according to claim 1, characterized in that, The coupling agent is a silane coupling agent.

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