CN114933782B - Epoxy resin grouting material and preparation method thereof - Google Patents

Abstract

The invention provides an epoxy resin grouting material which comprises the following raw material components in parts by mass: 100 parts of carboxyl-terminated modified epoxy resin, 20-40 parts of curing agent, 5-10 parts of toughening agent, 2-3 parts of coupling agent, 2-5 parts of thixotropic agent, 5-10 parts of water-absorbing filler, 15-20 parts of hydrophilic diluent and 10-15 parts of aliphatic reactive diluent; the carboxyl-terminated modified epoxy resin is dicarboxylic acid modified anionic hydrophilic epoxy resin, and the epoxy value of the epoxy resin is 0.25-0.30. The invention also provides a preparation method of the epoxy resin grouting material, which comprises the steps of S1, preparing the carboxyl-terminated modified epoxy resin; s2, preparing a premix; and S3, preparing the epoxy resin grouting material. The epoxy resin grouting material prepared by the invention can realize good grouting and bonding effects on a concrete crack interface in a humid environment.

Description

A kind of epoxy resin grouting material and preparation method thereof

technical field

The invention relates to the technical field of building materials, in particular to an epoxy resin grouting material used for concrete cracks in a humid environment and a preparation method thereof.

Background technique

Concrete is made by mixing cementitious materials, cement, sand, aggregate, water and admixtures in a certain proportion. After setting and curing, it is as hard as a stone and has good compressive capacity but poor tensile capacity. A large number of engineering practice and theoretical analysis show that almost all concrete components work with cracks. With the prolongation of the service time of concrete structures, some cracks continue to expand under the action of load or physical and chemical factors, forming macro cracks, that is, concrete cracks. In order to ensure the safety and durability of concrete components, grouting materials are usually used to repair narrow cracks.

However, most of the existing grouting materials are concrete chemical grouting materials, such as polymer mortar, polyurethane grouting materials, rubber repairing materials, epoxy resin grouting materials, etc. Among them, epoxy resin has high bonding strength and high rigidity. , adjustable curing range, excellent thermal stability, and good chemical corrosion resistance, it is the most widely used in concrete organic repair. However, in the case of the surface of concrete cracks in a humid environment, that is, when there is a water-covered layer on the surface of concrete cracks, it is difficult for traditional epoxy grouting materials to effectively wet and penetrate the wet concrete base surface, making the epoxy grouting material Only the surface of the water covering layer solidifies to form a film, preventing it from further spreading into the interior of the concrete matrix, so that the bonding ability between the surface of the concrete crack and the epoxy grouting material is reduced. Therefore, when repairing cracks, using existing grouting materials can easily lead to repair failure.

In summary, there is an urgent need for an epoxy resin grouting material for concrete cracks in a humid environment and a preparation method thereof, to solve the problem that existing grouting materials cannot effectively repair the surface of concrete cracks with a water-covered layer.

Contents of the invention

The first object of the present invention is to provide a kind of epoxy resin grouting material, and concrete technical scheme is as follows:

An epoxy resin grouting material, comprising the following raw material components in parts by mass: 100 parts of carboxyl-terminated modified epoxy resin, 20-40 parts of curing agent, 5-10 parts of toughening agent, and 2-3 parts of coupling agent 2-5 parts of thixotropic agent, 5-10 parts of water-absorbing filler, 15-20 parts of hydrophilic diluent and 10-15 parts of aliphatic reactive diluent;

The carboxyl-terminated modified epoxy resin is an anionic hydrophilic epoxy resin modified by dibasic carboxylic acid, and its epoxy value is 0.25-0.30.

In some embodiments, the raw material components used in the modification of the carboxyl-terminated modified epoxy resin include dicarboxylic acid, bisphenol A epoxy resin and catalyst; the dicarboxylic acid, bisphenol The molar ratio of phenol A type epoxy resin and catalyst is (0.8-1.0):1:0.05;

The dicarboxylic acids include oxalic acid, malonic acid, succinic acid, methylmalonic acid, glutaric acid, 2-methyl-1,4-butanedioic acid, dimethyl-1,3- At least one of malonic acid, isophthalic acid, 5-hydroxyisophthalic acid, 5-methylisophthalic acid, 4-hydroxyisophthalic acid and phthalic acid;

The catalyst includes at least one of benzyltriethylammonium chloride, 1-butyl-3-methylimidazolium bromide, tetrabutylphosphine bromide and triphenylphosphine.

In some embodiments, the model of the bisphenol A epoxy resin includes at least one of E-35, E42, E-44, E-51 and E55.

In some embodiments, the curing agent is amines, which include ethylenediamine, diethylenetriamine, triethylenetetramine, triethanolamine, tetraethylenepentamine, dipropylenetriamine, piperidine, triethylenediamine , N,N-dimethylpiperazine, N-aminoethylpiperazine, isophoronediamine, m-phenylenediamine, m-xylylenediamine, 3,3'-dimethyl-4,4' - at least one of diamino-dicyclohexylmethane, 4,4'-diaminodicyclohexylmethane, diaminodiphenylmethane and 2-aminodiphenylsulfone.

In some embodiments, the hydrophilic diluent is at least one of tetrahydrofuran, acetone and absolute ethanol.

In some embodiments, the toughening agent is an active toughening agent, which includes at least one of liquid polysulfide rubber, nitrile rubber, neoprene and polyether;

The coupling agent is a silane coupling agent containing an epoxy group or an amino functional group in the molecule, which includes γ-aminopropyltriethoxysilane, γ-aminopropyltrimethoxysilane, γ-aminopropyl Trimethoxysilane, 3-glycidyloxypropyltriethoxysilane, γ-glycidyloxypropyltrimethoxysilane, N-aminoethyl-3-aminopropyltrimethoxysilane, 3 -2-aminoethyl-aminopropyltrimethoxysilane, N-β-(aminoethyl)-γ-aminopropylmethyldimethoxysilane, N,N-diethyl-3-aminopropyl Trimethoxysilane, 3-(2,3-Glycidoxy)propylmethyldimethoxysilane, 3-(2,3-Glycidoxy)propylmethyldiethoxysilane, At least one of γ-glycidyloxypropyltriethoxysilane and γ-glycidyloxypropyltrimethoxysilane;

The thixotropic agent includes fumed silica, at least one of organic bentonite, hydrogenated castor oil and polyvinyl alcohol;

The water-absorbing filler includes a first component and a second component, and the mass ratio of the first component to the second component is 4:1; the first component is calcium oxide; the second component Parts include at least one of acrylic resin, polyvinyl alcohol resin and acrylamide;

The aliphatic reactive diluent is a short-chain aliphatic polyepoxy glycidyl ether, which includes diglycidyl ether, ethylene glycol diglycidyl ether, polypropylene glycol diglycidyl ether, 1,4-butanediol At least one of diglycidyl ether, glycerol triglycidyl ether, and trimethylolpropane triglycidyl ether.

In some embodiments, the purity of the hydrophilic diluent is AR grade; the viscosity of the aliphatic reactive diluent does not exceed 200 mPa.s at 25°C.

The second object of the present invention is to provide a kind of preparation method according to described epoxy resin grouting material, and specific technical scheme is as follows:

A kind of preparation method of described epoxy resin grouting material, comprises the steps:

Step S1, preparing carboxyl-terminated modified epoxy resin

Specifically, add a required molar amount of bisphenol A epoxy resin and a required molar amount of catalyst aqueous solution into a reaction kettle equipped with a first organic solvent, and stir and react at the first heating temperature for 2-3h;

Dissolving the required molar amount of dicarboxylic acid in an equal volume of the second organic solvent, mixing it evenly, adding it to the reaction kettle, and stirring and reacting at the second heating temperature for 0.5-1.5h to prepare a preform;

After the preform is cooled to room temperature, the semi-finished product is obtained after standing and layering through the third organic solvent, and the semi-finished product is vacuum-dried to constant weight to obtain a carboxyl-terminated modified epoxy resin;

Step S2, preparing the premix

Stir and mix the toughening agent, coupling agent, thixotropic agent, water-absorbing filler, hydrophilic diluent and aliphatic reactive diluent in required parts by mass with the carboxyl-terminated modified epoxy resin prepared in step S1 Prepare the premix after uniformity, and keep it sealed;

Step S3, preparing epoxy resin grouting material

The epoxy resin grouting material is prepared by stirring and mixing the premix and the curing agent in required parts by mass evenly.

In some embodiments, both the first organic solvent and the third organic solvent are toluene; the second organic solvent is isopropanol.

In some embodiments, the first heating temperature is 65°C-75°C; the second heating temperature is 65°C-75°C; the vacuum drying temperature is 40°C-50°C.

Applying the technical solution of the present invention has at least the following beneficial effects:

(1) The epoxy resin grouting material described in the present invention adopts carboxyl-terminated modified epoxy resin, and the hydroxyl groups generated in the strong hydrophilic group carboxyl and modification are introduced into the modified epoxy resin molecular chain, Increase the affinity of epoxy grouting materials to water molecules, so that the hydrophilic groups of modified epoxy molecules extend into the water-covered layer at the crack interface of the cement matrix, which overcomes the incompatibility between the existing grouting materials and the water-covered layer Disadvantages;

The use of the hydrophilic diluent further improves the hydrophilicity of the epoxy resin grouting material, and the excess hydrophilic diluent molecules will be selectively transferred to the wet surface of the cement matrix to replace the water molecules and improve the The state of the crack interface of the matrix, so as to form a good wetting ability to the water-covered interface;

The water-absorbing filler can absorb a large amount of water molecules in the water-covering layer to form a gel and keep the water molecules under a certain pressure from flowing out. When the epoxy resin grouting material is in contact with the concrete crack interface and forms a blended state with the interfacial water covering layer, under the hydrophilic action of the carboxyl-terminated modified epoxy resin and the hydrophilic diluent, the water in the water covering layer Rapid contact with the water-absorbing filler and being absorbed keeps the interface in a dry state. At the same time, the pressure generated by the water-absorbing filler can effectively expand the penetration radius of the epoxy grouting material, and strengthen the mechanical condensation between the epoxy resin grouting material and the concrete matrix. While reducing the volume shrinkage of the epoxy resin grouting material after curing. Water molecules finally exist in the curing system of epoxy grouting materials in the form of bound water, which eliminates the problem of insufficient durability of the repair system due to defects left by water evaporation after the existing grouting materials are cured.

(2) The epoxy resin grouting material prepared by the present invention can effectively change the surface structure of the water-covered layer at the interface of the concrete crack when repairing concrete cracks in a humid environment, and increase the wettability of the epoxy resin grouting material to the water-covered concrete matrix , to overcome the drawbacks of existing grouting materials being incompatible with water. The introduction of water-absorbing fillers into the repair system of epoxy grouting materials eliminates the influence of water evaporation on the strength and durability of the repair system. The invention can realize a good grouting and bonding effect on concrete crack interfaces in a humid environment, and has the characteristics of low viscosity, high strength, high toughness, high cohesive force, wear resistance and corrosion resistance.

Detailed ways

The technical solutions in the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Apparently, the described embodiments are only some of the embodiments of the present invention, not all of them. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments of the present invention belong to the protection scope of the present invention.

Example 1:

An epoxy resin grouting material, comprising the following raw material components in parts by mass: 100 parts of carboxyl-terminated modified epoxy resin, 20 parts of curing agent (specifically, triethylenediamine), toughening agent (specifically, liquid butyl Nitrile rubber) 5 parts, coupling agent (specifically γ-aminopropyltriethoxysilane) 2 parts, thixotropic agent (specifically fumed silica) 2.5 parts, water-absorbing filler (specifically 4 parts calcium oxide , 1 part of acrylic water-absorbent resin) 5 parts, 20 parts of hydrophilic diluent (tetrahydrofuran, the purity is AR grade) and aliphatic reactive diluent (specifically 1,4-butanediol diglycidyl ether, which at 25 ° C When the viscosity is 15 ~ 20mPa.s) 15 parts;

The carboxyl-terminated modified epoxy resin is an anionic hydrophilic epoxy resin modified by dibasic carboxylic acid, and its epoxy value is 0.29.

The raw material component that described carboxyl-terminated modified epoxy resin adopts when carrying out modification comprises dibasic carboxylic acid (specifically oxalic acid), bisphenol A type epoxy resin (specifically model is E-51, purchased in Shandong Youso Chemical Technology Co., Ltd.) and catalyst (be specifically benzyltriethylammonium chloride); the molar ratio of the dicarboxylic acid, bisphenol A type epoxy resin and catalyst is 1:1:0.05;

The preparation method of described epoxy resin grouting material, comprises the steps:

Step S1, preparing carboxyl-terminated modified epoxy resin

Concretely, in the reactor that the first organic solvent (being specifically toluene) is housed, add the bisphenol A type epoxy resin of required molar quantity and the catalyst aqueous solution of required molar quantity, and at the first heating temperature (being specifically 70°C) and stirred for 2.5h;

The dicarboxylic acid of required molar quantity is dissolved in the second organic solvent (specifically isopropanol) of equal volume, after mixing, add in the described reactor through dropping funnel, and at the second heating temperature (specifically Stirring and reacting for 1 h at 70°C) to prepare the preform;

After the preform is cooled to room temperature, it is added to a separatory funnel, and the upper layer solution is taken after adding a third organic solvent (specifically toluene) to stand for stratification, washed with water to obtain a semi-finished product, and the semi-finished product is vacuum-dried (the drying temperature is specifically: 50 DEG C) to constant weight, obtained carboxyl-terminated modified epoxy resin;

Step S2, preparing the premix

Stir and mix the toughening agent, coupling agent, thixotropic agent, water-absorbing filler, hydrophilic diluent and aliphatic reactive diluent in required parts by mass with the carboxyl-terminated modified epoxy resin prepared in step S1 Prepare the premix after uniformity, and keep it sealed;

Step S3, preparing epoxy resin grouting material

The epoxy resin grouting material is prepared by stirring and mixing the premix and the curing agent in required parts by mass evenly.

Example 2:

Different from Example 1, the epoxy resin grouting material includes the following raw material components in parts by mass: 100 parts of carboxy-terminated modified epoxy resin, curing agent (specifically 30 parts of ethylenediamine, triethanolamine 10 parts) 40 parts, toughening agent (specifically liquid polyether) 10 parts, thixotropic agent (specifically fumed silica) 2 parts, water-absorbing filler (specifically 8 parts of calcium oxide, 2 parts of acrylic resin) 10 parts 15 parts of hydrophilic diluent (specifically acetone, the purity is AR grade) and 10 parts of aliphatic reactive diluent (specifically ethylene glycol diglycidyl ether, which has a viscosity of 25-45mPa.s at 25°C) share;

The epoxy value of the carboxyl-terminated modified epoxy resin is 0.26. The carboxyl-terminated modified epoxy resin uses bisphenol A epoxy resin (specifically, the model is E-44, purchased from Shandong Youso Chemical Technology Co., Ltd.) in the raw material components.

Example 3:

The difference from Example 1 is that the epoxy resin grouting material includes the following raw material components in parts by mass: 100 parts of carboxy-terminated modified epoxy resin, 30 parts of curing agent (specifically diethylenetriamine), 6 parts of toughening agent (specifically, liquid polyether), 3 parts of coupling agent (specifically, 3-glycidyloxypropyltriethoxysilane), 5 parts of thixotropic agent (specifically, organic bentonite), water-absorbent Sexual filler (specifically 4 parts of calcium oxide, 2 parts of acrylic resin) 6 parts, hydrophilic diluent (specifically absolute ethanol, purity is AR grade) 17 parts and aliphatic reactive diluent (specifically trimethylol Propane triglycidyl ether, whose viscosity at 25°C is 90-120mPa.s) 12 parts;

The epoxy value of the carboxyl-terminated modified epoxy resin is 0.25. The bisphenol A type epoxy resin (specifically, the model is E-51, purchased from Shandong Youso Chemical Technology Co., Ltd.) is used in the raw material components of the carboxyl-terminated modified epoxy resin.

Comparative example 1:

The difference from Example 1 is that the carboxyl-terminated modified epoxy resin is bisphenol A epoxy resin, that is, no modification treatment is performed.

Comparative example 2:

The difference from Example 1 is that the mass of the carboxyl-terminated modified epoxy resin is 120 parts.

Comparative example 3:

The difference from Example 1 is that the mass of the carboxyl-terminated modified epoxy resin is 80 parts.

Comparative example 4:

Different from Example 1, the catalyst is tetrabutylammonium bromide.

Comparative example 5:

The difference from Example 1 is that the type of the bisphenol A epoxy resin is E20.

Comparative example 6:

The difference from Example 1 is that dicarboxylic acid is replaced by acetic acid.

Comparative example 7:

The difference from Example 1 is that the mass of the water-absorbing filler is 12 parts.

Comparative example 8:

The difference from Example 1 is that the mass of the water-absorbing filler is 3 parts.

Comparative example 9:

Different from Example 1, the mass of the hydrophilic diluent is 25 parts.

Comparative example 10:

Different from Example 1, the mass of the hydrophilic diluent is 10 parts.

Adopt the epoxy resin grouting material prepared by embodiment 1-3 and comparative example 1-10, carry out bond tensile strength test and bond flexural strength test after the cement specimen of fracture is repaired and bonded, concrete process is as follows :

1) The cement specimen used in the bond tensile strength test is a tensile specimen, and the tensile specimen adopts the "8"-shaped cement specimen suggested by the specification "GB/T16777-2008" (two separated O-shaped structure, two O-shaped structures are bonded into an "8"-shaped structure when repairing and bonding), and the bonded tensile strength test is carried out after 28 days of curing under standard curing conditions.

Specifically, 156 tensile test pieces were randomly selected and divided into 13 groups (12 tensile test pieces in each group) tensile test pieces, which were recorded as the first group, the second group, the third group, ... ... and group 13; out of 12 tensile test pieces in each group, 6 tensile test pieces were used for dry bond tensile strength test, and 6 tensile test pieces were used for wet bond tensile strength test . In the dry bond tensile strength test, each tensile test piece needs to be repaired and bonded after air-drying at room temperature for 4 days; in the wet bond tensile strength test, each tensile test piece needs to be soaked (specifically, in water After soaking for 4 days, wherein the water temperature is 18°C-22°C), take out and wipe off the clear water on the surface of the cement test piece, and repair and bond. When repairing and bonding, use the epoxy resin grouting material prepared in Example 1 of equal mass (specifically m ₀ ) to repair and bond each tensile test piece in the first group of tensile test pieces into "8 ""-shaped structure; use the epoxy resin grouting material prepared in Example 2 of equal mass (specifically m ₀ ) to repair and bond each tensile test piece in the second group of tensile test pieces into a "8" shape Structure: adopt the epoxy resin grouting material prepared by embodiment 3 of equal mass (being specifically m ₀ ) to repair and bond each tensile test piece in the third group of tensile test pieces into an "8"-shaped structure; Use the epoxy resin grouting material prepared in Comparative Example 1 of equal mass (specifically m ₀ ) to repair and bond each tensile test piece in the fourth group of tensile test pieces to form an "8"-shaped structure; .. ...; Use equal mass (specifically m ₀ ) epoxy resin grouting material prepared by Comparative Example 10 to repair and bond each tensile test piece in the 13th group of tensile test pieces to "8" font structure.

After the repaired and bonded tensile test pieces were left at room temperature for 24 hours, the bonded tensile strength test was carried out at a loading rate of 2 mm/min. The results of dry and wet bond tensile strength of each group are the average value of the data of 6 tensile test pieces, and the specific results are shown in Table 1.

2) The cement specimen used in the bonding flexural strength test is a flexural specimen, the size of which is 40mm long x 40mm wide x 160mm high. Cut at the midpoint of the side to conduct the bond flexural strength test.

Specifically, 156 flexural test pieces were randomly selected and divided into 13 groups (12 flexural test pieces in each group) of flexural test pieces, which were recorded as the first group, the second group, the third group, ... ... and group 13; in each group of 12 flexural test pieces, take 6 flexural test pieces for dry bond flexural strength test, and 6 flexural test pieces for wet bond flexural strength test . In the dry bonding flexural strength test, each flexural test piece needs to be repaired and bonded after air-drying at room temperature for 4 days; in the wet bonding flexural strength test, each flexural test piece needs to be soaked (specifically, in water After soaking for 4 days, wherein the water temperature is 18°C-22°C), take out and wipe off the open water on the surface of the flexural test piece to repair and bond. When repairing and bonding, use the epoxy resin grouting material prepared in Example 1 of equal mass (specifically m ₀ ) to repair and bond each flexural specimen in the first group of flexural specimens to form an integral structure ; Adopt the epoxy resin grouting material prepared by embodiment 2 of equal mass (specifically m ₀ ) to repair and bond each block of the flexural test pieces in the second group of flexural test pieces to form an integral structure; adopt equal mass ( The epoxy resin grouting material prepared in Example 3, specifically m ₀ ), is repaired and bonded to each of the flexural test pieces in the third group of flexural test pieces to form an integral structure; use equal mass (specifically m ₀ ) The epoxy resin grouting material prepared in Comparative Example 1 is repaired and bonded to each of the flexural specimens in the fourth group of flexural specimens to form an integral structure; ...; adopt equal mass (specifically m ₀ ) The epoxy resin grouting material prepared in Comparative Example 10 repaired and bonded each block of the flexural test specimens in the thirteenth group of flexural test specimens to form an integral structure.

After the repaired and bonded flexural test pieces were left at room temperature for 24 hours, the bonded flexural strength test was carried out at a loading speed of 50 N/s. The results of the dry and wet bond flexural strength of each group are the average value of the data of 6 flexural specimens, and the specific results are shown in Table 1.

Table 1

According to the data in Table 1,

1) Compared with Comparative Example 1 and Comparative Examples 4-6, the present invention adopts the carboxyl-terminated modified epoxy resin and suitable modified components in Examples 1-3 to ensure that the prepared epoxy resin grouting material It has better bonding flexural strength and bonding tensile strength.

2) Compared with Comparative Examples 2-3 and Comparative Examples 7-10, the present invention uses an appropriate amount of carboxyl-terminated modified epoxy resin, hydrophilic diluent and water-absorbing filler in Examples 1-3 to ensure that the The prepared epoxy grouting material has better bonding flexural strength and bonding tensile strength.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (10)

1. The epoxy resin grouting material is characterized by comprising the following raw material components in parts by mass: 100 parts of carboxyl-terminated modified epoxy resin, 20-40 parts of curing agent, 5-10 parts of toughening agent, 2-3 parts of coupling agent, 2-5 parts of thixotropic agent, 5-10 parts of water-absorbing filler, 15-20 parts of hydrophilic diluent and 10-15 parts of aliphatic reactive diluent;

the hydrophilic diluent is at least one of tetrahydrofuran, acetone and absolute ethyl alcohol;

the water-absorbing filler comprises a first component and a second component, and the mass ratio of the first component to the second component is 4; the first component is calcium oxide; the second component comprises at least one of acrylic resin, polyvinyl alcohol resin and acrylamide;

the carboxyl-terminated modified epoxy resin is dicarboxylic acid modified anionic hydrophilic epoxy resin, and the epoxy value of the epoxy resin is 0.25-0.30;

the raw material components adopted by the carboxyl-terminated modified epoxy resin during modification comprise dicarboxylic acid, bisphenol A epoxy resin and a catalyst; the molar ratio of the dicarboxylic acid to the bisphenol A epoxy resin to the catalyst is (0.8-1.0) 1:0.05; the catalyst is benzyltriethylammonium chloride.

2. The epoxy resin grouting material of claim 1, wherein the dicarboxylic acid comprises at least one of oxalic acid, malonic acid, succinic acid, methylmalonic acid, glutaric acid, 2-methyl-1, 4-succinic acid, dimethyl-1, 3-malonic acid, isophthalic acid, 5-hydroxyisophthalic acid, 5-methylisophthalic acid, 4-hydroxyisophthalic acid, and phthalic acid.

3. The epoxy resin grouting material of claim 2, wherein the bisphenol a type epoxy resin includes at least one of E-35, E42, E-44, E-51, and E55.

4. The epoxy resin grouting material of claim 2, wherein the curing agent is an amine including at least one of ethylenediamine, diethylenetriamine, triethylenetetramine, triethanolamine, tetraethylenepentamine, dipropylenetriamine, piperidine, triethylenediamine, N-dimethylpiperazine, N-aminoethylpiperazine, isophoronediamine, m-phenylenediamine, m-xylylenediamine, 3' -dimethyl-4, 4' -diamino-dicyclohexylmethane, 4' -diaminodicyclohexylmethane, diaminodiphenylmethane, and 2-aminodiphenylsulfone.

5. The epoxy resin grouting material of claim 2, wherein the toughening agent is an active toughening agent comprising at least one of liquid polysulfide rubber, nitrile rubber, neoprene, and polyether;

the coupling agent is a silane coupling agent containing an epoxy group or an amino functional group in a molecule, and comprises at least one of gamma-aminopropyltriethoxysilane, gamma-aminopropyltrimethoxysilane, 3-glycidyloxypropyltriethoxysilane, gamma-glycidyloxypropyltrimethoxysilane, N-aminoethyl-3-aminopropyltrimethoxysilane, 3-2-aminoethyl-aminopropyltrimethoxysilane, N-beta- (aminoethyl) -gamma-aminopropylmethyldimethoxysilane, N-diethyl-3-aminopropyltrimethoxysilane, 3- (2, 3-glycidoxy) propylmethyldimethoxysilane, 3- (2, 3-glycidoxy) propylmethyldiethoxysilane, gamma-glycidyloxypropyltriethoxysilane and gamma-glycidyloxypropyltrimethoxysilane;

the thixotropic agent comprises fumed silica, at least one of organic bentonite, hydrogenated castor oil and polyvinyl alcohol;

the aliphatic reactive diluent is short-chain aliphatic polyepoxy glycidyl ether which comprises at least one of diglycidyl ether, glycerol triglycidyl ether and trimethylolpropane triglycidyl ether.

6. The epoxy resin grouting material according to claim 5, wherein the diglycidyl ether includes at least one of ethylene glycol diglycidyl ether, polypropylene glycol diglycidyl ether, and 1, 4-butanediol diglycidyl ether.

7. The epoxy resin grouting material according to claim 6, wherein the purity of the hydrophilic diluent is AR grade; the viscosity of the aliphatic reactive diluent is not more than 200mPa.s at 25 ℃.

8. A method for preparing an epoxy resin grouting material according to any one of claims 2 to 7, comprising the steps of:

step S1, preparing carboxyl-terminated modified epoxy resin

Specifically, bisphenol A epoxy resin with the required molar quantity and catalyst aqueous solution with the required molar quantity are added into a reaction kettle filled with a first organic solvent, and the mixture is stirred and reacted for 2 to 3 hours at a first heating temperature;

dissolving dicarboxylic acid with the required molar weight in a second organic solvent with the same volume, uniformly mixing, adding into the reaction kettle, and stirring and reacting at a second heating temperature for 0.5-1.5h to prepare a prefabricated product;

cooling the prefabricated object to room temperature, standing and layering the prefabricated object by using a third organic solvent to obtain a semi-finished product, and drying the semi-finished product in vacuum until the weight is constant to obtain carboxyl-terminated modified epoxy resin;

step S2, preparing the premix

Uniformly stirring and mixing the toughening agent, the coupling agent, the thixotropic agent, the water-absorbing filler, the hydrophilic diluent and the aliphatic reactive diluent in required parts by mass with the carboxyl-terminated modified epoxy resin prepared in the step S1 to prepare a premix, and sealing and storing the premix;

step S3, preparing epoxy resin grouting material

And uniformly stirring and mixing the premix and the curing agent in required parts by mass to obtain the epoxy resin grouting material.

9. The method according to claim 8, wherein the first organic solvent and the third organic solvent are each toluene; the second organic solvent is isopropanol.

10. The method of claim 9, wherein the first heating temperature is 65 ℃ to 75 ℃; the second heating temperature is 65-75 ℃; the temperature of the vacuum drying is 40-50 ℃.