CN108753100B - Water-based epoxy concrete repairing interface agent and preparation method thereof - Google Patents
Water-based epoxy concrete repairing interface agent and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a water-based epoxy concrete repairing interface agent and a preparation method thereof, wherein the interface agent comprises a component A and a component B, wherein the component A comprises 5-30% of nano silicon dioxide emulsion, 50-65% of silane coupling agent and 5-45% of water-based epoxy resin by mass percent; the component B comprises 30-50% of flexible polyether amine and 50-70% of diethyl toluene diamine by mass percent. The preparation method comprises the following steps: 1) mixing the nano silicon dioxide emulsion, the silane coupling agent and the water-based epoxy resin according to the proportion to obtain a component A; 2) mixing flexible polyether amine and diethyl toluene diamine according to a proportion to obtain a component B; 3) and mixing the component A and the component B to obtain the interfacial agent. The repairing interface agent is applied to the surface of old concrete to form a coupling interface component which is easy to dealcoholize, and a hydration product which is relatively easy to dissolve is converted into a more stable gel state, so that the bonding effect of the repairing interface is improved, the product stability is good, and the construction is simple and convenient.
Description
The invention relates to a water-based epoxy concrete repairing interface agent and a preparation method thereof, belonging to the field of reinforcing agents for composite materials.
Background
With the extension of service age, the concrete structure has diseases such as inevitable cracks, denudation, large-area surface layer falling and even collapse and the like due to the action of factors such as human and natural environment and the like, so that the safety and the durability of the concrete structure are seriously damaged, and the direct economic loss of China is up to 3000 billions of yuan per year. In the face of the severe situation of continuous deterioration of the existing concrete structure, repairing and reinforcing become effective solutions.
The aqueous epoxy resin is a stable dispersion system prepared by dispersing particles or liquid drops in a dispersion medium taking water as a continuous phase, and the preparation of the aqueous epoxy resin is divided into an external emulsifier method and an epoxy resin self-emulsification method. The emulsification of epoxy resins with one or more suitable emulsifiers is a commonly used method, and the self-emulsification method is a method in which epoxy resins are reacted with compounds having surface active groups to form epoxy resins having water-soluble surface active groups, and bisphenol A type epoxy resins are usually etherified with polyethylene oxide or polyethylene glycol. The water-based epoxy resin can be diluted by water to reduce viscosity, is non-toxic and pollution-free, does not need drying treatment on a bonded surface, has good adhesion to a wet surface, and is cured quickly at normal temperature. However, when the water-based epoxy is used alone, the water evaporation is slow, and the residual water often causes the film forming time to be prolonged, and the coating film to be foamed or sunken; the concrete material has the advantages of high strength and durability, but has the defects of low tensile strength, poor cohesive force and toughness and the like, and if the two are compounded, the respective advantages can be fully exerted to make up the defects: the cement consumes moisture in hydration, resin curing is promoted, and the durability and the aging resistance of the resin are improved; the resin can be used as a continuous phase to fill in the defects and pores in the concrete to form a cross-linked network, so that the tensile strength, the cohesiveness and the toughness are improved.
However, the bonding surface of the new and old concrete is first broken as a stress concentration region under the action of a large stress or a continuous fatigue load, so that the bearing capacity of the structure in the repair region is reduced, and the surface repair material is largely dropped to cause repair failure. Therefore, the problem of interfacial adhesion of new and old concrete is one of the major problems in the field of repair. The most common concrete structure repairing and reinforcing method is to coat the surface of old concrete with epoxy interface agent and cover the repairing base material after roughening treatment such as roughening treatment. Because physical mechanical occlusion is a main source of the bonding strength of the concrete, the interface bonding effect is not obvious, so that the bonding of new and old concrete still puzzles scholars at home and abroad. To improve the bonding properties of old concrete to repair materials, more chemical bonds must be formed in the interface region to achieve efficient bonding of the old and new materials.
Considering that the exposed surface of old concrete mainly contains inorganic components such as calcium carbonate particles, C-S-H gel, a small amount of calcium hydroxide and unhydrated cement particles, the physical structure is loose and porous, and if epoxy resin is used for forming a good firm bonding surface, a layer of organic-inorganic covalent bond component with good wettability needs to be artificially manufactured from the viewpoint of chemical bond generation. The coupling agent is used as a chemical auxiliary agent which can effectively construct covalent bonds on an organic-inorganic interface, and becomes the most effective means for increasing the weak bonding force of mechanical bonding and electrostatic adsorption to the strong bonding force of covalent bond chemical bonding. The coupling agent is an organosilicon (or titanium, aluminum, etc.) compound having a specific structure, and has, in its molecule, both a reactive group capable of bonding to an inorganic material (such as glass, cement, metal, etc.) and a reactive group capable of bonding to an organic material (such as a synthetic resin, etc.).
The coupling mechanism is known at present to be the action of the coupling agent molecules and the residual hydroxyl groups on the interface of the old concrete to form covalent bonds and promote the increase of the bonding strength. However, the siloxane groups in the coupling agent molecule only function when they form silicon-oxygen-silicon covalent bonds with the remaining hydroxyl groups on the bonding surface under certain conditions. The prior use method of the coupling agent is mainly directly doped or coated, the coupling agent is coated on the surface of old concrete, and a large amount of methanol or ethanol and the like generated by hydrolysis and dealcoholization of surface hydroxyl greatly influence the hydration of cement near a bonding surface and weaken the bonding effect, which is contrary to the original intention of the coupling effect of cement-epoxy.
The surface of the nano silicon dioxide has rich silicon hydroxyl, can activate surrounding water molecular clusters, promote the hydrolysis of siloxane groups, accelerate dealcoholization and improve the cross-linking efficiency of interface silicon-oxygen-silicon covalent bonding; the nano silicon dioxide particles have small size effect, nucleation effect and wetting promotion effect, a compact silicon hydroxyl base layer is constructed on the surface of old concrete and in gaps, the plugging degree of pore plugs on the interface is maximized, and the physical occlusion effect is enhanced; the nano silicon dioxide catalyzes the silane coupling agent to hydrolyze, so that a coupling interface component which is easy to dealcoholize is formed on the surface of old concrete, a silicon-oxygen-silicon covalent bond structure is formed in a short period, a fragile interface transition area formed by hindering the hydration of cement due to dealcoholization in the hydrolysis condensation process of the coupling agent after the repair is finished is avoided, and the bonding effect of the repaired interface is improved; finally, the pore plug formed by the nano silicon dioxide and the coupling agent can consume the surplus calcium hydroxide on the interface in the cement hydration process, induce the C-S-H gel to grow in the interface and the defect, convert the hydration product which is relatively easy to dissolve into a more stable gel state, and promote the reinforcement and the enhancement of the repaired interface.
Disclosure of Invention
The technical problem is as follows: the invention aims to provide a water-based epoxy concrete repairing interface agent, which utilizes nano silicon dioxide subjected to hydrothermal treatment and a catalytic silane coupling agent to carry out hydrolytic condensation to form a high-efficiency interface agent with stable performance, wherein the interface agent can form a coupling interface component which is easy to dealcoholize on the surface of old concrete, a silicon-oxygen-silicon covalent bond structure is formed in a short period, and the bonding effect of a repairing interface is improved; meanwhile, in the process of efficiently promoting the chemical bonding of inorganic-organic materials on the old concrete repairing interface, the interfacial agent avoids the blocking effect of dealcoholization on the hydration of cement in the water-based epoxy concrete, thereby providing a technical approach for solving the repairing and bonding problems of the water-based epoxy concrete; meanwhile, the repairing interface agent has excellent performance, stable storage and wide adaptability, and meets the requirement of the market on concrete structure repair.
The invention also aims to provide a preparation method of the water-based epoxy concrete repairing interface agent, which has a mature preparation scheme and a simple process, can effectively improve the mechanical property and durability of water-based epoxy concrete repairing and conforms to the long-term sustainable development strategy of China.
The technical scheme is as follows: the invention provides a water-based epoxy concrete repairing interface agent, which comprises a component A and a component B according to the mass ratio of 1: 0.5-1: 1.4, wherein:
the component A comprises the following components in percentage by mass:
5 to 30 percent of nano silicon dioxide emulsion;
50 to 65 percent of silane coupling agent;
5 to 45 percent of water-based epoxy resin;
the component B comprises the following components in percentage by mass:
30-50% of flexible polyether amine;
50 to 70 percent of diethyl toluene diamine.
Wherein:
the nano-silica emulsion is treated by a hydrothermal method, the mass fraction of nano-silica in the emulsion is 5-10%, and the particle size of the nano-silica is less than 200 nm.
In the nano silicon dioxide emulsion, the nano silicon dioxide raw material is a powder material taking amorphous phase silicon dioxide as a main phase, and the purity of the nano silicon dioxide raw material is higher than 80 wt.%.
The powder material with amorphous phase silicon dioxide as a main phase refers to one or a mixture of more of gas phase silicon dioxide, superfine silica fume, silica sol, ground fly ash, superfine slag or white carbon black.
The silane coupling agent is a silane coupling agent containing epoxy functional groups.
The silane coupling agent is specifically one or a mixture of more of gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane, gamma- (2, 3-epoxypropoxy) propyl triethoxy silane, 2- (3, 4-epoxycyclohexyl) ethyl triethoxy silane or 2- (3, 4-epoxycyclohexyl) ethyl trimethoxy silane.
The water-based epoxy resin is water-soluble epoxy resin, and specifically is one or a mixture of more of anionic water-based epoxy resin, cationic water-based epoxy resin or nonionic water-based epoxy resin.
The invention also provides a preparation method of the water-based epoxy concrete repairing interface agent, which comprises the following steps:
1) preparing a component A: mixing the nano silicon dioxide emulsion, the silane coupling agent and the water-based epoxy resin according to the proportion, and uniformly stirring to obtain a component A;
2) preparing a component B: mixing the flexible polyether amine and the diethyl toluene diamine according to the proportion, and uniformly stirring to obtain a component B;
3) and mixing and stirring the component A and the component B uniformly to obtain the waterborne epoxy concrete repairing interface agent.
Wherein:
the preparation method of the nano silicon dioxide emulsion is that water and nano silicon dioxide raw materials are placed in a closed container according to a proportion, and are stirred for more than 5 hours at a stirring frequency of 20-200 rpm at a temperature of 80-100 ℃.
The step 1) of uniformly stirring to obtain the component A means stirring for more than 24 hours under the condition that the stirring speed is 20-200 rpm; the step 2) of uniformly stirring to obtain the component B means stirring for more than 2 hours under the condition that the stirring speed is 20-200 rpm; and 3) uniformly mixing and stirring the component A and the component B, namely stirring for more than 2 hours at a stirring speed of 20-200 rpm.
Has the advantages that: compared with the prior art, the invention has the following advantages:
1) the water-based epoxy concrete repairing interface agent provided by the invention can avoid a weak layer caused by the inhibition of the hydration of cement near the interface due to the hydrolysis and dealcoholization of siloxane;
2) the waterborne epoxy concrete repairing interface agent provided by the invention forms a coupling interface component which is easy to dealcoholize on the surface of old concrete, forms a silicon-oxygen-silicon covalent bond structure in a short period, improves the bonding effect of a repairing interface, has high bonding strength, can reach the tensile strength of the interface of 3.5MPa and has flexibility, and the elongation at break of the interface in a drawing way can reach 0.3%;
3) the water-based epoxy concrete repairing interface agent provided by the invention can form effective bonding with water-based epoxy concrete under the condition that a concrete repairing interface is wet, and the repairing effect is not influenced;
4) the nano silicon dioxide on the interface in the waterborne epoxy concrete repairing interface agent provided by the invention can be subjected to hydration interaction with cement to form a stable pore-bolt object, so that the interface bonding is more durable and is not easy to lose efficacy;
5) the waterborne epoxy concrete repair interface agent provided by the invention has the advantages of excellent performance, storage stability and wide adaptability, and meets the requirement of the market on concrete structure repair;
6) the preparation method of the waterborne epoxy concrete repair interface agent provided by the invention is mature, the process is simple, the mechanical property and durability of waterborne epoxy concrete repair can be effectively improved, and the long-term sustainable development strategy of China is met.
Drawings
FIG. 1 is a curve of resistivity and temperature with hydration time for normal hydration of cement;
FIG. 2 is a graph of resistivity and temperature of cement hydration versus hydration time in the presence of a coupling agent (10% loading);
FIG. 3 is a graph of resistivity and temperature of cement hydration versus hydration time in the presence of an interfacial agent of the present invention (10% loading);
FIG. 4 is a tensile strength curve of a member obtained by treating the surface of old concrete with the interface agent of the present invention and repairing the member with aqueous epoxy concrete in example 1;
FIG. 5 is a tensile strength curve of a member after the surface of old concrete is treated by the interface agent of the invention and repaired by water-based epoxy concrete in example 2;
FIG. 6 is a tensile strength curve of a member after the surface of old concrete is treated by the interface agent of the invention and repaired by water-based epoxy concrete in example 3;
FIG. 7 is a tensile strength curve of a member after the surface of old concrete is treated by the interface agent of the invention and repaired by water-based epoxy concrete in example 4;
FIG. 8 is a scanning electron micrograph of plugs formed on the surface of old concrete treated with the interface agent of the present invention.
Detailed Description
The invention provides a water-based epoxy concrete repairing interface agent, which is formed by hydrolyzing and condensing nano silicon dioxide and a catalytic silane coupling agent through hydrothermal treatment according to the chemical surface of material chemistry and the principle of organic chemistry to form a high-efficiency interface agent with stable performance; the surface of the nano silicon dioxide has rich silicon hydroxyl, and the water molecular clusters around can be activated after hydrothermal treatment, so that the hydrolysis of siloxane groups and dealcoholization acceleration are promoted, the influence on cement hydration is weakened, and the cross-linking efficiency of interface silicon-oxygen-silicon covalent bonding is improved.
The repairing interface agent can efficiently promote the chemical bonding of inorganic-organic materials on the old concrete repairing interface, and simultaneously avoid the blocking effect of dealcoholization on the hydration of cement in the water-based epoxy concrete. The repairing interface agent can form a coupling interface component which is easy to dealcoholize on the surface of old concrete, form a silicon-oxygen-silicon covalent bond structure in a short period, and improve the bonding effect of a repairing interface, thereby providing a technical approach for solving the repairing bonding problem of water-based epoxy concrete and meeting the requirement of the market on concrete structure repairing.
The invention also provides a preparation method of the waterborne epoxy concrete repair interface agent, the preparation scheme is mature, the process is simple, the mechanical property and durability of waterborne epoxy concrete repair can be effectively improved, and the long-term sustainable development strategy of China is met.
The invention is further illustrated by the following examples:
example 1
In order to illustrate the different effects of the product and a commercial silane coupling agent on cement hydration, P.II52.5 Portland cement is mixed with distilled water according to the mass ratio of 1 to 5, and the hydration heat release process and the conductivity change in the normal cement hydration process are measured, and the results are shown in figure 1. Wherein, the first hydration exothermic peak (0-1500 minutes) is cement dissolution exothermic, and the conductivity is rapidly increased; the second hydration exothermic peak (1500-3000 minutes) is cement solidification exothermic, and the conductivity is reduced along with the reduction of ions in the solution.
After cement paste with the same proportion is mixed, 10 mass percent of silane coupling agent is added immediately, and the test is carried out under the same system, and the result is shown in figure 2. It can be seen that the first hydration exotherm peak is significantly reduced and the second exotherm peak is nearly absent; the conductivity slowly increased without any decrease. From this it can be demonstrated that the hydrolytic dealcoholation of the coupling agent presents a severe hindrance to the setting of the cement hydration.
Immediately after mixing the same proportion of cement paste, 10% of the interface agent prepared by the invention (shown in figure 3) is added, and it can be seen that in the first 2000 minutes, the cement hydration process is basically completed and is relatively advanced compared with the control group (cement paste).
The following examples are provided in connection with the present invention:
example 1:
the water-based epoxy concrete repairing interface agent comprises a component A and a component B according to the mass ratio of 1:0.5, wherein:
the component A comprises the following components in percentage by mass:
5% of nano silicon dioxide emulsion;
50% of a silane coupling agent;
45% of water-based epoxy resin;
the component B comprises the following components in percentage by mass:
30% of flexible polyether amine;
and 70% of diethyltoluenediamine.
The preparation method comprises the following steps:
weighing fumed silica (with purity higher than 80 wt.%), distilled water, and stirring at 80 deg.C and 20rpm for 5 hr to obtain 5% nano silica emulsion (with particle size less than 200 nm); according to the mass ratio of 5: 50: 45 respectively weighing nano silicon dioxide emulsion, gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane and anionic waterborne epoxy resin, mixing in a container, and stirring at the stirring frequency of 200rpm for 24 hours to prepare a component A; respectively mixing flexible polyether amine (D400) and diethyl toluene diamine according to the mass ratio of 3:7, and stirring for 2h at the stirring frequency of 200rpm to prepare a component B; when in use, the A, B components are mixed according to the mass ratio of 1:0.5, and stirred for 5 hours under the condition of stirring frequency of 20rpm to obtain the waterborne epoxy concrete repairing interface agent.
The obtained water-based epoxy concrete repairing interface agent is uniformly sprayed or coated on the surface of concrete to be repaired (the flexural strength is 13Mpa and the tensile strength is 3Mpa), the water-based epoxy concrete is covered after standing for 5 minutes in a ventilated environment, and the tensile strength stress-strain curve of a test piece is shown in figure 4 after 7 days of curing.
Example 2:
the water-based epoxy concrete repairing interface agent comprises a component A and a component B according to the mass ratio of 1:1.4, wherein:
the component A comprises the following components in percentage by mass:
30% of nano silicon dioxide emulsion;
65% of a silane coupling agent;
5% of water-based epoxy resin;
the component B comprises the following components in percentage by mass:
50% of flexible polyether amine;
50% of diethyl toluene diamine.
The preparation method comprises the following steps:
weighing superfine silica fume (with purity higher than 80 wt.%), adding distilled water into a sealed container, stirring at 100 deg.C and stirring frequency of 200rpm for 6 hr, and mixing to obtain 10% nanometer silica emulsion (with particle size of less than 200 nm); according to the mass ratio of 5: 50: 45 respectively weighing superfine silica fume emulsion, gamma- (2, 3-epoxypropoxy) propyl triethoxysilane and cationic waterborne epoxy resin, mixing in a container, and stirring at the stirring frequency of 20rpm for 30h to prepare a component A; respectively mixing flexible polyether amine (D400) and diethyl toluene diamine according to the mass ratio of 1:1, and stirring for 5h at the stirring frequency of 200rpm to prepare a component B; when in use, the A, B components are mixed according to the mass ratio of 1:4, and stirred for 2 hours under the condition of stirring frequency of 200rpm to obtain the waterborne epoxy concrete repairing interface agent.
The obtained water-based epoxy concrete repairing interface agent is uniformly sprayed or coated on the surface of concrete to be repaired (the flexural strength is 13Mpa and the tensile strength is 3Mpa), the water-based epoxy concrete is covered after standing for 5 minutes in a ventilated environment, and the tensile strength stress-strain curve of a test piece is shown in figure 5 after 7 days of curing.
Example 3:
the water-based epoxy concrete repairing interface agent comprises a component A and a component B according to the mass ratio of 1:1, wherein:
the component A comprises the following components in percentage by mass:
20% of nano silicon dioxide emulsion;
60% of a silane coupling agent;
20% of water-based epoxy resin;
the component B comprises the following components in percentage by mass:
40% of flexible polyether amine;
60% of diethyl toluene diamine.
The preparation method comprises the following steps:
weighing silica sol (with purity higher than 80 wt.%), and distilled water, placing in a closed container, stirring at 90 deg.C with stirring frequency of 150rpm for 7h, and mixing to obtain nanometer silica emulsion (with mass fraction of 9% (nanometer silica particle size less than 200 nm); according to the mass ratio of 5: 50: 45 respectively weighing silica sol emulsion, 2- (3, 4-epoxy cyclohexyl) ethyl triethoxysilane and nonionic waterborne epoxy resin, mixing in a container, and stirring at a stirring frequency of 100rpm for 40h to prepare a component A; respectively mixing flexible polyether amine (D400) and diethyl toluene diamine according to the mass ratio of 3:7, and stirring for 6h at the stirring frequency of 20rpm to prepare a component B; when in use, the A, B components are mixed according to the mass ratio of 1:1, and stirred for 6h under the condition of stirring frequency of 100rpm, so as to obtain the waterborne epoxy concrete repairing interface agent.
The obtained water-based epoxy concrete repairing interface agent is uniformly sprayed or coated on the surface of concrete to be repaired (the flexural strength is 13Mpa and the tensile strength is 3Mpa), the water-based epoxy concrete is covered after standing for 5 minutes in a ventilated environment, and the tensile strength stress-strain curve of a test piece is shown in figure 6 after 7 days of curing.
Example 4:
the water-based epoxy concrete repairing interface agent comprises a component A and a component B according to the mass ratio of 1:1.2, wherein:
the component A comprises the following components in percentage by mass:
10% of nano silicon dioxide emulsion;
60% of a silane coupling agent;
30% of water-based epoxy resin;
the component B comprises the following components in percentage by mass:
35% of flexible polyether amine;
and 65% of diethyltoluenediamine.
The preparation method comprises the following steps:
weighing superfine slag (with purity higher than 80 wt.%), distilled water, and stirring at 100 deg.C and stirring frequency 80 for 15 hr to obtain 7% nanometer silica emulsion (with particle size less than 200 nm); according to the mass ratio of 5: 50: 45, respectively weighing nano silicon dioxide emulsion, 2- (3, 4-epoxy cyclohexyl) ethyl trimethoxy silane and anionic waterborne epoxy resin, mixing in a container, and stirring for 35 hours at a stirring frequency of 80rpm to prepare a component A; respectively mixing flexible polyether amine (D400) and diethyl toluene diamine according to the mass ratio of 3:7, and stirring for 6h at the stirring frequency of 100rpm to prepare a component B; when in use, the A, B components are mixed according to the mass ratio of 1:1, and stirred for 6h under the condition of stirring frequency of 150rpm, so as to obtain the waterborne epoxy concrete repairing interface agent.
The obtained water-based epoxy concrete repairing interface agent is uniformly sprayed or coated on the surface of concrete to be repaired (the flexural strength is 13Mpa and the tensile strength is 3Mpa), the water-based epoxy concrete is covered after standing for 5 minutes in a ventilated environment, and the tensile strength stress-strain curve of a test piece is shown in figure 7 after 7 days of curing.
A large number of hole-bolt objects can be formed on the surface by treating the old concrete repairing surface by the interface agent, and the appearance graph of the hole-bolt objects is shown in figure 8.
Claims (6)
1. The water-based epoxy concrete repairing interface agent is characterized by comprising the following components in parts by weight: the interface agent comprises a component A and a component B according to the mass ratio of 1: 0.5-1: 1.4, wherein:
the component A comprises the following components in percentage by mass:
5 to 30 percent of nano silicon dioxide emulsion;
50 to 65 percent of silane coupling agent;
5 to 45 percent of water-based epoxy resin;
the component B comprises the following components in percentage by mass:
30-50% of flexible polyether amine D400;
50 to 70 percent of diethyl toluene diamine;
wherein the nano-silica emulsion is a nano-silica emulsion treated by a hydrothermal method, the mass fraction of nano-silica in the emulsion is 5-10%, and the particle size of the nano-silica is less than 200 nm;
in the nano silicon dioxide emulsion, the nano silicon dioxide raw material is a powder material which takes amorphous phase silicon dioxide as a main phase, and the purity of the nano silicon dioxide raw material is higher than 80 wt.%;
the silane coupling agent is a silane coupling agent containing epoxy functional groups.
2. The aqueous epoxy concrete repair interface agent of claim 1, wherein: the powder material with amorphous phase silicon dioxide as a main phase refers to one or a mixture of more of gas phase silicon dioxide, superfine silica fume, silica sol, ground fly ash, superfine slag or white carbon black.
3. The aqueous epoxy concrete repair interface agent of claim 1, wherein: the silane coupling agent is specifically one or a mixture of more of gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane, gamma- (2, 3-epoxypropoxy) propyl triethoxy silane, 2- (3, 4-epoxycyclohexyl) ethyl triethoxy silane or 2- (3, 4-epoxycyclohexyl) ethyl trimethoxy silane.
4. The aqueous epoxy concrete repair interface agent of claim 1, wherein: the water-based epoxy resin is water-soluble epoxy resin, and specifically is one or a mixture of more of anionic water-based epoxy resin, cationic water-based epoxy resin or nonionic water-based epoxy resin.
5. The preparation method of the water-based epoxy concrete repairing interface agent according to claim 1, characterized by comprising the following steps: the preparation method comprises the following steps:
1) preparing a component A: mixing the nano silicon dioxide emulsion, the silane coupling agent and the water-based epoxy resin according to the proportion, and uniformly stirring to obtain a component A;
2) preparing a component B: mixing the flexible polyether amine D400 and the diethyl toluene diamine according to the proportion, and uniformly stirring to obtain a component B;
3) mixing and stirring the component A and the component B uniformly to obtain the waterborne epoxy concrete repairing interface agent;
the preparation method of the nano-silica emulsion comprises the steps of putting water and nano-silica raw materials in a closed container according to a proportion, and stirring for more than 5 hours at a stirring frequency of 20-200 rpm at a temperature of 80-100 ℃.
6. The method for preparing the water-based epoxy concrete repairing interface agent according to claim 5, wherein the method comprises the following steps: the step 1) of uniformly stirring to obtain the component A means stirring for more than 24 hours under the condition that the stirring speed is 20-200 rpm; the step 2) of uniformly stirring to obtain the component B means stirring for more than 2 hours under the condition that the stirring speed is 20-200 rpm; the step 3) of uniformly mixing and stirring the component A and the component B refers to stirring for more than 2 hours at a stirring speed of 20-200 rpm.
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