Epoxy resin modified cement mortar repair material and preparation method thereof

Abstract

The application discloses an epoxy resin modified cement mortar repairing material and a preparation method thereof, and relates to the technical field of cement. The epoxy resin modified cement mortar repairing material comprises the following raw materials in parts by weight: 100 parts by weight of cement, 180-220 parts by weight of sandstone, 8-15 parts by weight of modified epoxy resin, 4-9 parts by weight of maleimide functionalized curing agent, 5-10 parts by weight of KH560 solution, 2-4 parts by weight of nano-mineralized nucleating agent, 0.2-0.6 parts by weight of water reducing agent and 35-45 parts by weight of water. The epoxy resin modified cement mortar repairing material prepared by the application is modified through dynamic covalent bond reversible crosslinking, nano-multistage mineralization induced hydration and interface synergistic toughening, and thus the problems of traditional repairing mortar, such as great brittleness, easy cracking, no self-repairing, easy interface debonding, poor aging resistance, low early strength and the like, are solved.

Description

Technical Field

[0001] This invention relates to the field of cement technology, specifically to an epoxy resin modified cement mortar repair material and its preparation method. Background Technology

[0002] Cement concrete is a material with advantages such as high rigidity, strong load-bearing capacity, good high-temperature stability, strong resistance to water damage, high flexural strength, excellent weather resistance, and durability. However, when cement concrete is exposed to the natural environment, it is affected by natural factors such as temperature stress, wet-dry cycles, and freeze-thaw cycles. At the same time, it is subjected to impact and abrasion, which can cause phenomena such as cracks, longitudinal joint tension, joint breakage, misalignment, and surface wear on the material surface. These phenomena can affect the strength and stability of the concrete structure. Therefore, it is necessary to take effective measures to protect or repair the concrete structure in order to improve its durability, extend its service life, and ensure its normal use.

[0003] Epoxy resin modified cement mortar is a polymer-based composite material prepared by mixing epoxy resin as a binder, inorganic minerals as filler aggregates (such as sand and cement), and appropriate amounts of additives (curing agents, diluents, toughening agents, etc.) and other fillers in a certain proportion at natural temperature through the polymerization reaction of resin and curing agent. As a high-performance composite material, epoxy resin modified cement mortar has been widely used in the repair, reinforcement, and protection of concrete structures. Its basic principle is that epoxy resin and curing agent form an epoxy resin-curing agent cementitious system, which impregnates and coats inorganic fillers such as sand and cement. After a curing reaction, a solidified body is formed, providing a tough three-dimensional network structure and improving the brittleness, adhesion, impermeability, and durability defects of traditional cement mortar.

[0004] Although epoxy resin modified cement mortar has better performance than ordinary cement mortar, the following prominent problems still exist in practical applications and research: (1) The epoxy resin and cement paste have poor compatibility. Simple mechanical blending leads to uneven distribution of resin phase, which easily forms weak areas. Epoxy resin is difficult to form a continuous network, and the toughening effect is limited; (2) The curing reaction of epoxy resin is greatly affected by temperature and humidity. Epoxy curing and cement hydration are difficult to coordinate in time, which affects the final performance; (3) Epoxy resin is prone to aging under ultraviolet light, humid heat, and freeze-thaw cycles. The interface between the polymer film and cement hydration products will debond due to shrinkage differences, chloride ion erosion, carbonization and other factors during long-term service, resulting in performance degradation. Summary of the Invention

[0005] The purpose of this invention is to provide an epoxy resin modified cement mortar repair material and its preparation method, thereby solving the following technical problems: Existing epoxy resin modified cement mortars suffer from problems such as poor compatibility, narrow construction window, and insufficient durability.

[0006] The objective of this invention can be achieved through the following technical solutions: A method for preparing an epoxy resin modified cement mortar repair material includes the following steps: Modified epoxy resin and maleimide functionalized curing agent are blended to obtain organic adhesive solution; Sand and gravel are mixed with KH560 solution, and then cement and nano-mineralization nucleating agent are added and mixed to obtain premixed powder. Organic adhesive, premixed powder, water, and water-reducing agent are mixed to obtain epoxy resin modified cement mortar repair material; The nano-mineralization nucleating agent is a composite particle with aminated mesoporous nano-silica as the core, PAA / PEI layered self-assembly on the surface, and then coated with a porous calcium carbonate layer; the porous calcium carbonate layer is doped with zinc ions and cerium ions.

[0007] As a further aspect of the present invention, the method for preparing the modified epoxy resin includes the following steps: A1: Under a nitrogen atmosphere, bisphenol A type epoxy resin and anhydrous ethanol were added to a reaction flask and dispersed evenly. The temperature was controlled at 55-65℃. Furan methanol and boron trifluoride ether were mixed and added to the reaction flask. The temperature was controlled at 60-70℃ and the reaction was maintained for 3-6 hours. Butyl glycidyl ether was added and dispersed. The reaction was maintained for 0.5-1 hours. Ethanol was removed by vacuum distillation and filtered to obtain furan functionalized modified epoxy resin. A2: Add furan-functionalized epoxy resin, anhydrous ethanol, and pyridine methanol to a reaction flask for dispersion, add p-toluenesulfonic acid, control the temperature at 75-85℃, keep the reaction at this temperature for 3-6 hours, remove the ethanol by vacuum distillation, filter, and obtain the modified epoxy resin. The addition ratio of bisphenol A type epoxy resin, anhydrous ethanol, furanol methanol, boron trifluoride ethyl ether, and alkyl glycidyl ether in A1 is 100g: 30-50mL: 8-15g: 0.3-0.8g: 5-10g; The addition ratio of furan-functionalized epoxy resin, anhydrous ethanol, pyridine methanol, and p-toluenesulfonic acid in A2 is 100g: 200-400mL: 8-12g: 0.3-0.5g.

[0008] As a further embodiment of the present invention, the preparation method of maleimide functionalized curing agent includes the following steps: adding polyamide curing agent and acetone into a reaction flask for dispersion, adding maleic anhydride for dispersion, controlling the temperature at 45-55℃ and keeping the reaction at this temperature for 2-4 hours, adding acetic anhydride and sodium acetate, controlling the temperature at 110-125℃ and keeping the reaction at this temperature for 2-4 hours, removing acetone and acetic anhydride by vacuum distillation, and drying to obtain maleimide functionalized curing agent; The addition ratio of polyamide curing agent, acetone, maleic anhydride, acetic anhydride, and sodium acetate is 100g: 40-80mL: 8-14g: 12-18g: 1-2g.

[0009] As a further aspect of the present invention: a method for preparing nano-mineralization nucleating agents includes the following steps: B1: Aminated mesoporous nano-silica and deionized water were added to a reaction flask and dispersed. PAA solution was added and dispersed for 0.5-1 h. After centrifugation, PAA-coated mesoporous silica was obtained. PAA-coated mesoporous silica and deionized water were added to a reaction flask and dispersed. PEI solution was added and dispersed. After centrifugation, washing, and heat treatment, self-encapsulated mesoporous silica was obtained. B2: Calcium chloride and deionized water are added to the reaction vessel for dispersion, followed by the addition of self-contained mesoporous silica for dispersion, and then zinc nitrate and cerium nitrate for dispersion. The adsorption treatment is carried out for 0.5-1 h, followed by the addition of sodium carbonate solution. The temperature is controlled at 20-30℃, and the reaction is allowed to stand for 2-4 h. The mixture is then centrifuged, washed, dried, ground, and sieved to obtain the nano-mineralization nucleating agent.

[0010] As a further aspect of the present invention: in B1, the PAA solution is 2-4 mg / mL PAA solution; the PEI solution is 1-2 mg / mL PEI solution; the addition ratio of aminated mesoporous nano-silica, deionized water I, and PAA solution is 10 g: 100-200 mL: 25-50 mL; the addition ratio of PAA-coated mesoporous silica, deionized water II, and PEI solution is 10 g: 100-200 mL: 25-50 mL; the heat treatment is carried out at a controlled temperature of 180-200℃ for 1-2 hours; In B2, the sodium carbonate solution is a 20-35 mg / mL sodium carbonate aqueous solution; the addition ratio of calcium chloride, deionized water, self-packed mesoporous silica, zinc nitrate, cerium nitrate, and sodium carbonate solution is 2.5-4 g: 50-80 mL: 10 g: 0.08-0.15 g: 0.05-0.12 g: 100-200 mL.

[0011] As a further aspect of the present invention, a method for preparing aminated mesoporous nano-silica includes the following steps: C1: Mix 2-4g of hexadecyltrimethylammonium bromide, 200-400mL of anhydrous ethanol, and 20-40mL of deionized water. Add ammonia to adjust the pH to 10.5-11, control the temperature at 55-65℃, add 20g of tetraethyl orthosilicate, and keep the reaction at this temperature for 2-4 hours. Filter, wash, dry, and calcine to obtain mesoporous nano-silica. Calcination is carried out at 500-600℃ for 4-6 hours. C2: Add 10g of mesoporous nano silica, 3-6g of 3-aminopropyltriethoxysilane, and 100-200mL of toluene to a reaction flask and disperse. Heat and reflux for 9-12 hours. Filter, wash, and dry to obtain aminated mesoporous nano silica.

[0012] As a further aspect of the present invention: the KH560 solution is composed of 1-2g KH560 and 4-8g anhydrous ethanol; The epoxy resin modified cement mortar repair material comprises the following raw materials in parts by weight: 100 parts by weight of cement, 180-220 parts by weight of sand and gravel, 8-15 parts by weight of modified epoxy resin, 4-9 parts by weight of maleimide functionalized curing agent, 5-10 parts by weight of KH560 solution, 2-4 parts by weight of nano-mineralization nucleating agent, 0.2-0.6 parts by weight of water-reducing agent, and 35-45 parts by weight of water; wherein the water-reducing agent is a polycarboxylate water-reducing agent.

[0013] As a further aspect of the present invention: the sand and gravel are composed of river sand with a particle size of 0.15-0.3 mm, 0.3-0.6 mm, 0.6-1.18 mm, 1.18-2.36 mm, and 2.36-4.75 mm, in a mass ratio of 26-36:20-30:7-11:8-12:15-20.

[0014] An epoxy resin modified cement mortar repair material is prepared by any one of the above preparation methods.

[0015] The beneficial effects of this invention are: This invention provides a novel epoxy resin-modified cement mortar repair material. Through the synergistic effect of modified epoxy resin, maleimide functionalized curing agent, nano-mineralization nucleating agent, KH560, and multi-graded aggregate, the mechanical properties, interfacial bond strength, impermeability, freeze-thaw resistance, and dynamic self-healing ability of the repair material are significantly improved. Compared with existing technologies, it has the following beneficial effects: (1) The synergistic effect of modified epoxy resin, maleimide functionalized curing agent and nano-mineralization nucleating agent endows the material with dynamic self-healing ability, impermeability, antifreeze and durability. This application adds modified epoxy resin to epoxy resin-modified cement mortar repair material, and simultaneously introduces furan groups and pyridine groups into the side chains of the epoxy resin. This application also adds a nano-mineralizing nucleating agent to the epoxy resin-modified cement mortar repair material, wherein Zn is slowly released from the nano-mineralizing nucleating agent. 2+ Zn 2+It rapidly forms coordination bonds with the nitrogen atoms in the pyridine group. These bonds bind and dissociate extremely quickly at room temperature, establishing a dynamic cross-linked network within minutes of the repair material being poured, providing initial strength and self-healing capabilities. When the material is subjected to external forces and microcracks develop, the coordination bonds break, dissipating energy; under humid or room temperature curing conditions, the coordination bonds can reform, achieving self-healing of the cracks.

[0016] This application uses a maleimide-functionalized curing agent as the curing agent. The maleimide groups in the maleimide-functionalized curing agent undergo a Diels-Alder cycloaddition reaction with the furan groups in the modified epoxy resin at ambient temperature to form a reversible covalent bond. This bond can reversibly dissociate at higher temperatures (such as summer exposure or localized heating during freeze-thaw cycles), absorbing and dispersing thermal stress; it re-bonds after cooling, thereby endowing the material with excellent freeze-thaw resistance and temperature fatigue resistance.

[0017] Zn in the surface layer of the nano-mineralization nucleating agent prepared in this application 2+ It acts as both a coordination center and a Lewis acid catalyst for the DA reaction, lowering the activation energy of the DA reaction and enabling it to proceed at a considerable rate at room temperature. This forms a dual dynamic network where coordination bonds dominate the early response and DA bonds enhance long-term stability, solving the core problem that traditional epoxy resin-modified cement mortar cannot form a dynamic self-healing structure at room temperature.

[0018] (2) Adding nano-mineralization nucleating agents to impart interfacial bonding strength, mechanical properties and aging resistance to the material. This application adds a nano-mineralizing nucleating agent to epoxy resin modified cement mortar repair material. The porous calcium carbonate shell on the surface of the nano-mineralizing nucleating agent slowly dissolves in the alkaline environment of the cement slurry, continuously releasing Ca. 2+ This process increases local supersaturation, induces the directional growth of CSH gel and ettringite on the nucleating agent surface, forming mineral bridges, significantly refining the hydrated crystal grain size, and improving matrix density. The microporous / mesoporous structure formed by the PAA / PEI layer in the middle layer of the nano-mineralized nucleating agent after partial removal of the polyelectrolyte template through heat treatment provides nanoscale anchoring points for the epoxy resin, enabling mechanical interlocking between the organic and inorganic phases and reducing interfacial debonding. The porous calcium carbonate shell on the surface of the nano-mineralized nucleating agent contains Zn. 2+ and Ce 3+ Zn 2+ It is slowly released into the resin phase, acting as a coordination center to bind with pyridine groups, while simultaneously catalyzing the DA reaction and stabilizing dynamic covalent bonds. Ce 3+As a cement hydration accelerator, it accelerates early hydration heat release and improves early strength; simultaneously, as a free radical scavenger, it significantly enhances the UV aging and thermo-oxidative aging resistance of epoxy resin. The mesoporous SiO2 core of the nano-mineralization nucleating agent provides a high specific surface area and additional nucleation sites, continuously promoting hydration in the later stages and refining the pore structure, blocking corrosive media such as chloride ions.

[0019] (3) Adding KH560, KH560 pre-adsorbs sand and gravel to construct a strong organic-inorganic transition layer, giving the material interfacial bonding strength, impermeability, freeze resistance and durability. This invention involves adding KH560 to epoxy resin-modified cement mortar repair material and pre-adsorbing KH560 onto the surface of aggregates. The aggregate surface is then modified with silanol groups obtained from the hydrolysis of KH560, forming a uniform organosilicon film after drying. When cement slurry and resin are added, the epoxy groups of KH560 copolymerize with the modified epoxy resin, and the silanols obtained from the hydrolysis of methoxy groups condense with cement hydration products to form Si-O-Ca chemical bonds. This interfacial layer enhances the bond between the resin and aggregates and blocks the channels for moisture penetration along the interface, thereby improving tensile bond strength.

[0020] (4) Multi-graded sand and gravel with low water-cement ratio achieve dense packing This application uses five-stage continuously graded sand and gravel with a particle size of 0.15-4.75 mm, mixed in a reasonable proportion to allow coarse, medium, and fine particles to fill each other, minimizing porosity. Combined with the filling effect of polycarboxylate superplasticizer and nano-nucleating agent, it maintains good fluidity even at a low water-cement ratio. The hardened body has a highly refined pore structure, exhibiting high strength, low shrinkage, and high impermeability. Detailed Implementation

[0021] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Example 1: The preparation method of modified epoxy resin includes the following steps: A1: Under a nitrogen atmosphere, 100g of bisphenol A type epoxy resin (EPON 828) and 30mL of anhydrous ethanol were added to a reaction flask and dispersed evenly. The temperature was controlled at 55℃. 8g of furan methanol and 0.3g of boron trifluoride ether were mixed and added to the reaction flask. The temperature was controlled at 60℃ and the reaction was maintained for 3h. 5g of butyl glycidyl ether was added and dispersed. The reaction was maintained for 0.5h. Ethanol was removed by vacuum distillation and filtered to obtain furan functionalized modified epoxy resin. A2: 100g of furan-functionalized modified epoxy resin, 200mL of anhydrous ethanol, and 8g of pyridine methanol were added to a reaction flask for dispersion. 0.3g of p-toluenesulfonic acid was added, and the temperature was controlled at 75℃ for 3h. The ethanol was removed by vacuum distillation, and the mixture was filtered to obtain the modified epoxy resin.

[0023] The preparation method of maleimide functionalized curing agent includes the following steps: 100g of polyamide curing agent (Versamid 125) and 40mL of acetone are added to a reaction flask for dispersion, 8g of maleic anhydride is added for dispersion, the temperature is controlled at 45℃ and the reaction is kept at this temperature for 2h, 12g of acetic anhydride and 1g of sodium acetate are added, the temperature is controlled at 110℃ and the reaction is kept at this temperature for 2h, acetone and acetic anhydride are removed by vacuum distillation, and the product is dried to obtain maleimide functionalized curing agent.

[0024] The preparation method of nano-mineralization nucleating agent includes the following steps: B1: 2g of hexadecyltrimethylammonium bromide, 200mL of anhydrous ethanol, and 20mL of deionized water were mixed, and ammonia was added to adjust the pH to 10.5. The temperature was controlled at 55℃, and 20g of tetraethyl orthosilicate was added. The mixture was kept at this temperature for 2 hours, filtered, washed, dried, and calcined at 500℃ for 6 hours to obtain mesoporous nano-silica. 10g of mesoporous nano-silica, 3g of 3-aminopropyltriethoxysilane, and 100mL of toluene were added to a reaction flask and dispersed. The mixture was heated to reflux and reacted for 9 hours. After filtration, washing, and drying, aminated mesoporous nano-silica was obtained. 10g of aminated mesoporous silica nanoparticles and 100mL of deionized water were added to a reaction flask for dispersion. 50mL of 2mg / mL PAA solution (PAA molecular weight 50000, solution pH 7.5) was added and dispersed for 0.5h. After centrifugation, PAA-coated mesoporous silica was obtained. 10g of PAA-coated mesoporous silica and 100mL of deionized water were added to a reaction flask for dispersion. 50mL of 1mg / mL PEI solution (PEI molecular weight 750000, solution pH 7.5) was added and dispersed. After centrifugation, washing, and heat treatment at 180℃ for 2h, self-encapsulated mesoporous silica was obtained. B2: 2.5g of calcium chloride and 50mL of deionized water were added to the reaction vessel for dispersion. 10g of self-packed mesoporous silica was added for dispersion. 0.08g of zinc nitrate and 0.05g of cerium nitrate were added for dispersion. The mixture was adsorbed for 0.5h. 100mL of 30mg / mL sodium carbonate solution was added. The temperature was controlled at 20℃ and the mixture was allowed to stand for 2h. After centrifugation, washing, drying, grinding, and sieving, the nano-mineralization nucleating agent was obtained.

[0025] A method for preparing an epoxy resin modified cement mortar repair material includes the following steps: 120g of the modified epoxy resin prepared in Example 1 and 65g of the maleimide functionalized curing agent prepared in Example 1 were blended to obtain an organic adhesive solution. 666g of river sand with a particle size of 0.15-0.3mm, 536g of river sand with a particle size of 0.3-0.6mm, 182g of river sand with a particle size of 0.6-1.18mm, 208g of river sand with a particle size of 1.18-2.36mm, and 348g of river sand with a particle size of 2.36-4.75mm were blended to obtain sand and gravel; 20g of KH560 and 80g of anhydrous ethanol were mixed and sprayed onto the sand and gravel and allowed to stand and dry; 1000g of cement and 40g of the nano-mineralization nucleating agent prepared in Example 1 were added and blended to obtain a premixed powder. Organic adhesive liquid, premixed powder, 400g water, and 4g polycarboxylate superplasticizer are mixed to obtain epoxy resin modified cement mortar repair material.

[0026] Example 2: The preparation method of modified epoxy resin includes the following steps: A1: Under a nitrogen atmosphere, 100g of bisphenol A type epoxy resin (EPON 828) and 40mL of anhydrous ethanol were added to a reaction flask and dispersed evenly. The temperature was controlled at 60℃. 12g of furanol methanol and 0.5g of boron trifluoride ether were mixed and added to the reaction flask. The temperature was controlled at 65℃ and the reaction was maintained for 4.5h. 7.5g of butyl glycidyl ether was added and dispersed. The reaction was maintained for 0.5h. Ethanol was removed by vacuum distillation and filtered to obtain furan functionalized modified epoxy resin. A2: 100g of furan-functionalized modified epoxy resin, 300mL of anhydrous ethanol, and 10g of pyridine methanol were added to a reaction flask and dispersed. 0.4g of p-toluenesulfonic acid was added, and the temperature was controlled at 80℃ for 4.5h. The ethanol was removed by vacuum distillation and filtered to obtain the modified epoxy resin.

[0027] The preparation method of maleimide functionalized curing agent includes the following steps: 100g of polyamide curing agent (Versamid 125) and 60mL of acetone are added to a reaction flask for dispersion, 11g of maleic anhydride is added for dispersion, the temperature is controlled at 50℃ and the reaction is kept at this temperature for 3h, 15g of acetic anhydride and 1.5g of sodium acetate are added, the temperature is controlled at 120℃ and the reaction is kept at this temperature for 3h, acetone and acetic anhydride are removed by vacuum distillation, and the product is dried to obtain maleimide functionalized curing agent.

[0028] The preparation method of nano-mineralization nucleating agent includes the following steps: B1: 3g of hexadecyltrimethylammonium bromide, 300mL of anhydrous ethanol, and 30mL of deionized water were mixed, and ammonia was added to adjust the pH to 11. The temperature was controlled at 60℃, and 20g of tetraethyl orthosilicate was added. The mixture was kept at this temperature for 3 hours, filtered, washed, dried, and calcined at 500℃ for 6 hours to obtain mesoporous nano-silica. 10g of mesoporous nano-silica, 4.5g of 3-aminopropyltriethoxysilane, and 150mL of toluene were added to a reaction flask and dispersed. The mixture was heated to reflux and reacted for 11 hours. After filtration, washing, and drying, aminated mesoporous nano-silica was obtained. 10g of aminated mesoporous silica nanoparticles and 150mL of deionized water were added to a reaction flask for dispersion. 50mL of 2mg / mL PAA solution (PAA molecular weight 50000, solution pH 7.5) was added and dispersed for 0.5-1h. After centrifugation, PAA-coated mesoporous silica was obtained. 10g of PAA-coated mesoporous silica and 150mL of deionized water were added to a reaction flask for dispersion. 50mL of 1mg / mL PEI solution (PEI molecular weight 750000, solution pH 7.5) was added and dispersed. After centrifugation and washing, the mixture was heat-treated at 180℃ for 2h to obtain self-encapsulated mesoporous silica. B2: 3.2g of calcium chloride and 60mL of deionized water were added to the reaction vessel for dispersion. 10g of self-packed mesoporous silica was added for dispersion. 0.12g of zinc nitrate and 0.1g of cerium nitrate were added for dispersion. The mixture was adsorbed for 0.5h. 200mL of 30mg / mL sodium carbonate solution was added. The temperature was controlled at 25℃ and the mixture was allowed to stand for 3h. After centrifugation, washing, drying, grinding, and sieving, the nano-mineralization nucleating agent was obtained.

[0029] A method for preparing an epoxy resin modified cement mortar repair material includes the following steps: 120g of the modified epoxy resin prepared in Example 2 and 65g of the maleimide functionalized curing agent prepared in Example 2 were blended to obtain an organic adhesive solution. 666g of river sand with a particle size of 0.15-0.3mm, 536g of river sand with a particle size of 0.3-0.6mm, 182g of river sand with a particle size of 0.6-1.18mm, 208g of river sand with a particle size of 1.18-2.36mm, and 348g of river sand with a particle size of 2.36-4.75mm were blended to obtain sand and gravel; 20g of KH560 and 80g of anhydrous ethanol were mixed and sprayed onto the sand and gravel and allowed to stand and dry; 1000g of cement and 40g of the nano-mineralization nucleating agent prepared in Example 2 were added and blended to obtain a premixed powder. Organic adhesive liquid, premixed powder, 400g water, and 4g polycarboxylate superplasticizer are mixed to obtain epoxy resin modified cement mortar repair material.

[0030] Example 3: The preparation method of modified epoxy resin includes the following steps: A1: Under a nitrogen atmosphere, 100g of bisphenol A type epoxy resin (EPON 828) and 50mL of anhydrous ethanol were added to a reaction flask and dispersed evenly. The temperature was controlled at 65℃. 15g of furan methanol and 0.8g of boron trifluoride ether were mixed and added to the reaction flask. The temperature was controlled at 70℃ and the reaction was maintained for 6h. 10g of butyl glycidyl ether was added and dispersed. The reaction was maintained for 1h. Ethanol was removed by vacuum distillation and filtered to obtain furan functionalized modified epoxy resin. A2: 100g of furan-functionalized modified epoxy resin, 400mL of anhydrous ethanol, and 12g of pyridine methanol were added to a reaction flask for dispersion. 0.5g of p-toluenesulfonic acid was added, and the temperature was controlled at 85℃ for 6h. The ethanol was removed by vacuum distillation, and the mixture was filtered to obtain the modified epoxy resin.

[0031] The preparation method of maleimide functionalized curing agent includes the following steps: 100g of polyamide curing agent (Versamid 125) and 80mL of acetone are added to a reaction flask for dispersion, 8-14g of maleic anhydride is added for dispersion, the temperature is controlled at 55℃ and the reaction is kept at this temperature for 4h, 18g of acetic anhydride and 2g of sodium acetate are added, the temperature is controlled at 125℃ and the reaction is kept at this temperature for 4h, acetone and acetic anhydride are removed by vacuum distillation, and the product is dried to obtain maleimide functionalized curing agent.

[0032] The preparation method of nano-mineralization nucleating agent includes the following steps: B1: 4g of hexadecyltrimethylammonium bromide, 400mL of anhydrous ethanol, and 40mL of deionized water were mixed, and ammonia was added to adjust the pH to 11. The temperature was controlled at 65℃, and 20g of tetraethyl orthosilicate was added. The mixture was kept at this temperature for 4 hours, filtered, washed, dried, and calcined at 500℃ for 6 hours to obtain mesoporous nano-silica. 10g of mesoporous nano-silica, 6g of 3-aminopropyltriethoxysilane, and 200mL of toluene were added to a reaction flask and dispersed. The mixture was heated to reflux and reacted for 12 hours. After filtration, washing, and drying, aminated mesoporous nano-silica was obtained. 10g of aminated mesoporous silica nanoparticles and 200mL of deionized water were added to a reaction flask for dispersion. 50mL of 2mg / mL PAA solution (PAA molecular weight 50000, solution pH 7.5) was added and dispersed for 1h. After centrifugation, PAA-coated mesoporous silica was obtained. 10g of PAA-coated mesoporous silica and 200mL of deionized water were added to a reaction flask for dispersion. 50mL of 1mg / mL PEI solution (PEI molecular weight 750000, solution pH 7.5) was added and dispersed. After centrifugation and washing, the mixture was heat-treated at 180℃ for 2h to obtain self-encapsulated mesoporous silica. B2: Add 4g of calcium chloride and 80mL of deionized water to the reaction vessel for dispersion, add 10g of self-packed mesoporous silica for dispersion, add 0.15g of zinc nitrate and 0.12g of cerium nitrate for dispersion, adsorb for 1h, add 200mL of 30mg / mL sodium carbonate solution, control the temperature at 30℃, let stand for 4h, centrifuge, wash, dry, grind and sieve to obtain nano-mineralization nucleating agent.

[0033] A method for preparing an epoxy resin modified cement mortar repair material includes the following steps: 120g of the modified epoxy resin prepared in Example 3 and 65g of the maleimide functionalized curing agent prepared in Example 3 were blended to obtain an organic adhesive solution. 666g of river sand with a particle size of 0.15-0.3mm, 536g of river sand with a particle size of 0.3-0.6mm, 182g of river sand with a particle size of 0.6-1.18mm, 208g of river sand with a particle size of 1.18-2.36mm, and 348g of river sand with a particle size of 2.36-4.75mm were blended to obtain sand and gravel; 20g of KH560 and 80g of anhydrous ethanol were mixed and sprayed onto the sand and gravel and allowed to stand and dry; 1000g of cement and 40g of the nano-mineralization nucleating agent prepared in Example 3 were added and blended to obtain a premixed powder. Organic adhesive liquid, premixed powder, 400g water, and 4g polycarboxylate superplasticizer are mixed to obtain epoxy resin modified cement mortar repair material.

[0034] Comparative Example 1: A method for preparing an epoxy resin modified cement mortar repair material. Compared with Example 2, only the maleimide functionalized curing agent prepared in Example 2 is replaced with polyetheramine D230 in equal amounts. The remaining components and preparation methods are completely consistent with Example 2.

[0035] Comparative Example 2: A method for preparing an epoxy resin modified cement mortar repair material. Compared with Example 2, only 20g of KH560 and 80g of anhydrous ethanol added in Example 2 were removed. The remaining components and preparation method were completely the same as in Example 2.

[0036] Comparative Example 3: A method for preparing an epoxy resin modified cement mortar repair material. Compared with Example 2, only the modified epoxy resin prepared in Example 2 was replaced in equal amounts with bisphenol A type epoxy resin (EPON828). The remaining components and preparation methods were completely consistent with Example 2.

[0037] The preparation method of the modified epoxy resin in Comparative Example 4 includes the following steps: A1: Under a nitrogen atmosphere, 100g of bisphenol A type epoxy resin (EPON 828) and 40mL of anhydrous ethanol were added to a reaction flask and dispersed evenly. The temperature was controlled at 60℃. 12g of furan methanol and 0.5g of boron trifluoride diethyl ether were mixed and added to the reaction flask. The temperature was controlled at 65℃ and the reaction was maintained for 4.5h. The ethanol was removed by vacuum distillation and filtered to obtain furan functionalized modified epoxy resin. A2: 100g of furan-functionalized modified epoxy resin, 300mL of anhydrous ethanol, and 10g of pyridine methanol were added to a reaction flask and dispersed. 0.4g of p-toluenesulfonic acid was added, and the temperature was controlled at 80℃ for 4.5h. The ethanol was removed by vacuum distillation and filtered to obtain the modified epoxy resin.

[0038] A method for preparing epoxy resin modified cement mortar repair material, compared with Example 2, is that the modified epoxy resin prepared in Example 2 is replaced in equal amounts with the modified epoxy resin prepared in Comparative Example 4, and the remaining components and preparation methods are completely the same as in Example 2.

[0039] Comparative Example 5: The preparation method of the modified epoxy resin includes the following steps: Under a nitrogen atmosphere, 100g of bisphenol A type epoxy resin (EPON 828) and 40mL of anhydrous ethanol were added to a reaction flask and dispersed evenly. The temperature was controlled at 60℃. 12g of furanol methanol and 0.5g of boron trifluoride ether were mixed and added to the reaction flask. The temperature was controlled at 65℃ and the reaction was maintained for 4.5h. 7.5g of butyl glycidyl ether was added and dispersed. The reaction was maintained for 0.5h. Ethanol was removed by vacuum distillation and filtered to obtain the modified epoxy resin.

[0040] A method for preparing epoxy resin modified cement mortar repair material, compared with Example 2, is that the modified epoxy resin prepared in Example 2 is replaced in equal amounts with the modified epoxy resin prepared in Comparative Example 5, and the remaining components and preparation methods are completely the same as in Example 2.

[0041] Comparative Example 6: A method for preparing an epoxy resin modified cement mortar repair material. Compared with Example 2, only the nano-mineralization nucleating agent prepared in Example 2 was removed. The remaining components and preparation method are completely consistent with Example 2.

[0042] The preparation method of the comparative example 7 nanometer mineralization nucleating agent includes the following steps: B1: 10g of nano-silica, 4.5g of 3-aminopropyltriethoxysilane, and 150mL of toluene were added to a reaction flask and dispersed. The mixture was heated to reflux and reacted for 11h. After filtration, washing, and drying, amino-modified nano-silica was obtained. 10g of aminated nano-silica and 150mL of deionized water were added to a reaction flask for dispersion. 50mL of 2mg / mL PAA solution (PAA molecular weight 50000, solution pH 7.5) was added and dispersed for 0.5-1h. After centrifugation, PAA-coated mesoporous silica was obtained. 10g of PAA-coated mesoporous silica and 150mL of deionized water were added to a reaction flask for dispersion. 50mL of 1mg / mL PEI solution (PEI molecular weight 750000, solution pH 7.5) was added and dispersed. After centrifugation and washing, the mixture was heat-treated at 180℃ for 2h to obtain self-encapsulated silica. B2: 3.2g of calcium chloride and 60mL of deionized water were added to the reaction vessel for dispersion, 10g of self-packaged silica was added for dispersion, 0.12g of zinc nitrate and 0.1g of cerium nitrate were added for dispersion, and the adsorption treatment was carried out for 0.5h. Then, 200mL of 30mg / mL sodium carbonate solution was added, the temperature was controlled at 25℃, and the reaction was allowed to stand for 3h. After centrifugation, washing, drying, grinding and sieving, nano-mineralization nucleating agent was obtained.

[0043] A method for preparing epoxy resin modified cement mortar repair material, compared with Example 2, only replaces the nano-mineralizing nucleating agent prepared in Example 2 with an equal amount of the nano-mineralizing nucleating agent prepared in Comparative Example 7, and the remaining components and preparation methods are completely consistent with Example 2.

[0044] The preparation method of the comparative example 8 nanometer mineralization nucleating agent includes the following steps: B1: 3g of hexadecyltrimethylammonium bromide, 300mL of anhydrous ethanol, and 30mL of deionized water were mixed, and ammonia was added to adjust the pH to 11. The temperature was controlled at 60℃, and 20g of tetraethyl orthosilicate was added. The mixture was kept at this temperature for 3 hours, filtered, washed, dried, and calcined at 500℃ for 6 hours to obtain mesoporous nano-silica. 10g of mesoporous nano-silica, 4.5g of 3-aminopropyltriethoxysilane, and 150mL of toluene were added to a reaction flask and dispersed. The mixture was heated to reflux and reacted for 11 hours. After filtration, washing, and drying, aminated mesoporous nano-silica was obtained. B2: 3.2g of calcium chloride and 60mL of deionized water were added to the reaction vessel for dispersion, followed by 10g of aminated mesoporous nano silica for dispersion, and 0.12g of zinc nitrate and 0.1g of cerium nitrate for dispersion. The mixture was adsorbed for 0.5h, and then 200mL of 30mg / mL sodium carbonate solution was added. The temperature was controlled at 25℃ and the mixture was allowed to stand for 3h. After centrifugation, washing, drying, grinding and sieving, the nano mineralization nucleating agent was obtained.

[0045] A method for preparing epoxy resin modified cement mortar repair material, compared with Example 2, only replaces the nano-mineralizing nucleating agent prepared in Example 2 with an equal amount of the nano-mineralizing nucleating agent prepared in Comparative Example 8, and the remaining components and preparation methods are completely consistent with Example 2.

[0046] The preparation method of the comparative example 9 nanometer mineralization nucleating agent includes the following steps: B1: 3g of hexadecyltrimethylammonium bromide, 300mL of anhydrous ethanol, and 30mL of deionized water were mixed, and ammonia was added to adjust the pH to 11. The temperature was controlled at 60℃, and 20g of tetraethyl orthosilicate was added. The mixture was kept at this temperature for 3 hours, filtered, washed, dried, and calcined at 500℃ for 6 hours to obtain mesoporous nano-silica. 10g of mesoporous nano-silica, 4.5g of 3-aminopropyltriethoxysilane, and 150mL of toluene were added to a reaction flask and dispersed. The mixture was heated to reflux and reacted for 11 hours. After filtration, washing, and drying, aminated mesoporous nano-silica was obtained. 10g of aminated mesoporous silica nanoparticles and 150mL of deionized water were added to a reaction flask for dispersion. 50mL of 2mg / mL PAA solution (PAA molecular weight 50000, solution pH 7.5) was added and dispersed for 0.5-1h. After centrifugation, PAA-coated mesoporous silica was obtained. 10g of PAA-coated mesoporous silica and 150mL of deionized water were added to a reaction flask for dispersion. 50mL of 1mg / mL PEI solution (PEI molecular weight 750000, solution pH 7.5) was added and dispersed. After centrifugation and washing, the mixture was heat-treated at 180℃ for 2h to obtain self-encapsulated mesoporous silica. B2: 3.2g of calcium chloride and 60mL of deionized water were added to the reaction vessel for dispersion, 10g of self-packed mesoporous silica was added for dispersion, 0.1g of cerium nitrate was added for dispersion, adsorption treatment was carried out for 0.5h, 200mL of 30mg / mL sodium carbonate solution was added, the temperature was controlled at 25℃, and the reaction was allowed to stand for 3h. After centrifugation, washing, drying, grinding and sieving, nano-mineralization nucleating agent was obtained.

[0047] A method for preparing epoxy resin modified cement mortar repair material, compared with Example 2, only replaces the nano-mineralizing nucleating agent prepared in Example 2 with an equal amount of the nano-mineralizing nucleating agent prepared in Comparative Example 9, while the remaining components and preparation methods are completely consistent with Example 2.

[0048] The preparation method of the comparative example 10 nm mineralization nucleating agent includes the following steps: B1: 3g of hexadecyltrimethylammonium bromide, 300mL of anhydrous ethanol, and 30mL of deionized water were mixed, and ammonia was added to adjust the pH to 11. The temperature was controlled at 60℃, and 20g of tetraethyl orthosilicate was added. The mixture was kept at this temperature for 3 hours, filtered, washed, dried, and calcined at 500℃ for 6 hours to obtain mesoporous nano-silica. 10g of mesoporous nano-silica, 4.5g of 3-aminopropyltriethoxysilane, and 150mL of toluene were added to a reaction flask and dispersed. The mixture was heated to reflux and reacted for 11 hours. After filtration, washing, and drying, aminated mesoporous nano-silica was obtained. 10g of aminated mesoporous silica nanoparticles and 150mL of deionized water were added to a reaction flask for dispersion. 50mL of 2mg / mL PAA solution (PAA molecular weight 50000, solution pH 7.5) was added and dispersed for 0.5-1h. After centrifugation, PAA-coated mesoporous silica was obtained. 10g of PAA-coated mesoporous silica and 150mL of deionized water were added to a reaction flask for dispersion. 50mL of 1mg / mL PEI solution (PEI molecular weight 750000, solution pH 7.5) was added and dispersed. After centrifugation and washing, the mixture was heat-treated at 180℃ for 2h to obtain self-encapsulated mesoporous silica. B2: 3.2g of calcium chloride and 60mL of deionized water were added to the reaction vessel for dispersion, 10g of self-packed mesoporous silica was added for dispersion, and 0.12g of zinc nitrate was added for dispersion. The adsorption treatment was carried out for 0.5h, and 200mL of 30mg / mL sodium carbonate solution was added. The temperature was controlled at 25℃ and the reaction was allowed to stand for 3h. After centrifugation, washing, drying, grinding and sieving, nano-mineralization nucleating agent was obtained.

[0049] A method for preparing epoxy resin modified cement mortar repair material, compared with Example 2, is that the nano-mineralizing nucleating agent prepared in Example 2 is replaced in equal amounts with the nano-mineralizing nucleating agent prepared in Comparative Example 10, and the remaining components and preparation methods are completely consistent with Example 2.

[0050] Performance testing (1) Flowability: According to GB / T 2419-2005 "Method for Determination of Flowability of Cement Mortar", the flowability at 0 min and 30 min was measured using a truncated cone flowability tester. The test results are shown in Table 1. (2) Setting time: The initial setting time and final setting time were tested according to GB / T 1346-89 "Test Methods for Standard Consistency Water Requirement, Setting Time and Soundness of Cement". The test results are shown in Table 1. Table 1: Statistical Table of Performance Test Data for Examples 1-3 and Comparative Examples 1-10

[0051] As shown in Table 1, the epoxy resin modified cement mortar repair materials prepared in Examples 1-3 of this application have a flowability of about 270 mm at 0 min, which provides a sufficient construction operation window; and a flowability of about 248 mm at 30 min, which indicates good slump retention.

[0052] (3) Flexural and compressive strength: The flexural and compressive strength were tested according to GB / T 17671-2021 "Test Method for Strength of Cement Mortar (ISO Method)". The test results are shown in Table 2. (4) Tensile bond strength: Tested according to German standard DIN18555-5. The formula for calculating tensile bond strength is: R=F / A Where: F - tensile force at the point of pull-out failure, kN; A- Bonding area between mortar and concrete slab (5cm x 5cm = 25cm) 2 The test results are shown in Table 2. Table 2: Statistical Table of Mechanical Property Test Data for Examples 1-3 and Comparative Examples 1-10

[0053] As shown in Table 2, the epoxy resin modified cement mortar repair materials prepared in Examples 1-3 of this application have excellent mechanical properties.

[0054] (5) Freeze-thaw resistance: The test was conducted according to GB / T 50082-2009 "Standard for Test Methods of Long-term Performance and Durability of Ordinary Concrete". The samples prepared in Examples 1-3 and Comparative Examples 1-10 were made into 100mm×100mm×400mm prisms. The prisms were soaked in water for 4 days, then treated at -20℃ for 4 hours, and the temperature was raised to 5℃ within 1 hour as one cycle. After 100 cycles, the strength was tested and the strength retention rate was calculated. The test results are shown in Table 3. (6) Water permeability resistance: The test was conducted according to JGJ / T 70-2009 "Standard for Test Methods of Basic Performance of Building Mortar". The samples prepared in Examples 1-3 and Comparative Examples 1-10 were made into frustums with a top diameter of 70 mm, a bottom diameter of 80 mm, and a height of 30 mm. The initial water pressure was 0.1 MPa, and the pressure was increased by 0.1 MPa each time. Each pressure level was held for 8 hours. The test results are shown in Table 3. (7) Drying shrinkage rate: According to GB / T 29417-2012 "Test method for drying shrinkage cracking performance of cement mortar and concrete", the samples prepared in Examples 1-3 and Comparative Examples 1-10 were made into prisms of 40mm×40mm×160mm and the shrinkage rate after 28 days was tested. The test results are shown in Table 3. (8) Strength self-healing rate: The samples prepared in Examples 1-3 and Comparative Examples 1-10 were cured for 28 days and preloaded to 60% of the failure load. After curing for 3 days, the strength was retested according to GB / T 17671-2021 "Test Method for Strength of Cement Mortar (ISO Method)" and the strength self-healing rate was calculated. The test results are shown in Table 3. Table 3: Statistical Table of Durability Performance Test Data for Examples 1-3 and Comparative Examples 1-8

[0055] As shown in Table 3, the epoxy resin modified cement mortar repair materials prepared in Examples 1-3 of this application have excellent durability.

[0056] The foregoing has provided a detailed description of one embodiment of the present invention, but this description is merely a preferred embodiment and should not be construed as limiting the scope of the invention. All equivalent variations and modifications made within the scope of the claims of this invention should still fall within the patent coverage of this invention.

Claims

1. A method for preparing epoxy resin modified cement mortar repair material, characterized in that, Includes the following steps: Modified epoxy resin and maleimide functionalized curing agent are blended to obtain organic adhesive liquid; Sand and gravel are mixed with KH560 solution, and then cement and nano-mineralization nucleating agent are added and mixed to obtain premixed powder. Organic adhesive, premixed powder, water, and water-reducing agent are mixed to obtain epoxy resin modified cement mortar repair material; The nano-mineralization nucleating agent is a composite particle with aminated mesoporous nano-silica as the core, PAA / PEI layers self-assembled on the surface, and then coated with a porous calcium carbonate layer; the porous calcium carbonate layer is doped with zinc ions and cerium ions.

2. The preparation method of epoxy resin modified cement mortar repair material according to claim 1, characterized in that, The preparation method of the modified epoxy resin includes the following steps: A1: Under a nitrogen atmosphere, bisphenol A type epoxy resin and anhydrous ethanol were added to a reaction flask and dispersed evenly. The temperature was controlled at 55-65℃. Furan methanol and boron trifluoride ether were mixed and added to the reaction flask. The temperature was controlled at 60-70℃ and the reaction was maintained for 3-6 hours. Butyl glycidyl ether was added and dispersed. The reaction was maintained for 0.5-1 hours. Ethanol was removed by vacuum distillation and filtered to obtain furan functionalized modified epoxy resin. A2: Add furan-functionalized epoxy resin, anhydrous ethanol, and pyridine methanol to a reaction flask for dispersion, add p-toluenesulfonic acid, control the temperature at 75-85℃, keep the reaction at this temperature for 3-6 hours, remove the ethanol by vacuum distillation, filter, and obtain the modified epoxy resin.

3. The method for preparing an epoxy resin modified cement mortar repair material according to claim 2, characterized in that, The addition ratio of bisphenol A type epoxy resin, anhydrous ethanol, furanol methanol, boron trifluoride ethyl ether, and alkyl glycidyl ether in A1 is 100g: 30-50mL: 8-15g: 0.3-0.8g: 5-10g; The addition ratio of furan-functionalized epoxy resin, anhydrous ethanol, pyridine methanol, and p-toluenesulfonic acid in A2 is 100g: 200-400mL: 8-12g: 0.3-0.5g.

4. The preparation method of epoxy resin modified cement mortar repair material according to claim 1, characterized in that, The preparation method of the maleimide functionalized curing agent includes the following steps: adding polyamide curing agent and acetone into a reaction flask for dispersion, adding maleic anhydride for dispersion, controlling the temperature at 45-55℃ and keeping the reaction at this temperature for 2-4 hours, adding acetic anhydride and sodium acetate, controlling the temperature at 110-125℃ and keeping the reaction at this temperature for 2-4 hours, removing acetone and acetic anhydride by vacuum distillation, and drying to obtain the maleimide functionalized curing agent; The addition ratio of polyamide curing agent, acetone, maleic anhydride, acetic anhydride, and sodium acetate is 100g: 40-80mL: 8-14g: 12-18g: 1-2g.

5. The method for preparing an epoxy resin modified cement mortar repair material according to claim 1, characterized in that, The preparation method of the nano-mineralization nucleating agent includes the following steps: B1: Aminated mesoporous nano-silica and deionized water were added to a reaction flask and dispersed. PAA solution was added and dispersed for 0.5-1 h. After centrifugation, PAA-coated mesoporous silica was obtained. PAA-coated mesoporous silica and deionized water were added to a reaction flask and dispersed. PEI solution was added and dispersed. After centrifugation, washing, and heat treatment, self-encapsulated mesoporous silica was obtained. B2: Calcium chloride and deionized water are added to the reaction vessel for dispersion, followed by the addition of self-contained mesoporous silica for dispersion, and then zinc nitrate and cerium nitrate for dispersion. The adsorption treatment is carried out for 0.5-1 h, followed by the addition of sodium carbonate solution. The temperature is controlled at 20-30℃, and the reaction is allowed to stand for 2-4 h. The mixture is then centrifuged, washed, dried, ground, and sieved to obtain the nano-mineralization nucleating agent.

6. The preparation method of an epoxy resin modified cement mortar repair material according to claim 5, characterized in that, In B1, the PAA solution is 2-4 mg / mL; the PEI solution is 1-2 mg / mL; the addition ratio of aminated mesoporous nano-silica, deionized water I, and PAA solution is 10 g: 100-200 mL: 25-50 mL; the addition ratio of PAA-coated mesoporous silica, deionized water II, and PEI solution is 10 g: 100-200 mL: 25-50 mL; the heat treatment is carried out at a controlled temperature of 180-200℃ for 1-2 hours. In B2, the sodium carbonate solution is a 20-35 mg / mL sodium carbonate aqueous solution; the addition ratio of calcium chloride, deionized water, self-packed mesoporous silica, zinc nitrate, cerium nitrate, and sodium carbonate solution is 2.5-4 g: 50-80 mL: 10 g: 0.08-0.15 g: 0.05-0.12 g: 100-200 mL.

7. The preparation method of an epoxy resin modified cement mortar repair material according to claim 5, characterized in that, The method for preparing the aminated mesoporous nano-silica includes the following steps: C1: Mix 2-4g of hexadecyltrimethylammonium bromide, 200-400mL of anhydrous ethanol and 20-40mL of deionized water, add ammonia to adjust the pH to 10.5-11, control the temperature at 55-65℃, add 20g of tetraethyl orthosilicate, keep the reaction at this temperature for 2-4 hours, filter, wash, dry and calcine to obtain mesoporous nano silica; C2: Add 10g of mesoporous nano silica, 3-6g of 3-aminopropyltriethoxysilane, and 100-200mL of toluene to a reaction flask and disperse. Heat and reflux for 9-12 hours. Filter, wash, and dry to obtain aminated mesoporous nano silica.

8. The method for preparing an epoxy resin modified cement mortar repair material according to claim 1, characterized in that, The KH560 solution is composed of 1-2g KH560 and 4-8g anhydrous ethanol; The epoxy resin modified cement mortar repair material comprises the following raw materials in parts by weight: 100 parts by weight of cement, 180-220 parts by weight of sand and gravel, 8-15 parts by weight of modified epoxy resin, 4-9 parts by weight of maleimide functionalized curing agent, 5-10 parts by weight of KH560 solution, 2-4 parts by weight of nano-mineralization nucleating agent, 0.2-0.6 parts by weight of water-reducing agent, and 35-45 parts by weight of water; wherein the water-reducing agent is a polycarboxylate water-reducing agent.

9. The preparation method of an epoxy resin modified cement mortar repair material according to claim 1, characterized in that, The sand and gravel are composed of river sand with a particle size of 0.15-0.3 mm, 0.3-0.6 mm, 0.6-1.18 mm, 1.18-2.36 mm, and 2.36-4.75 mm, in a mass ratio of 26-36:20-30:7-11:8-12:15-20.

10. An epoxy resin modified cement mortar repair material, characterized in that, It is prepared by the method described in any one of claims 1-9.

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