A water-based interface agent and preparation method thereof

Abstract

The present invention discloses a water-based interface agent and a preparation method thereof, belonging to the field of building materials technology. The water-based interface agent comprises the following raw materials, calculated by weight: 23-30 parts of bisphenol A epoxy resin, 13-18 parts of acrylic emulsion, 9-13 parts of silicone resin, 8-12 parts of polyvinyl alcohol resin, 16-24 parts of nanofiller, 0.9-1.6 parts of emulsifier, 4-6 parts of additive, and 15-22 parts of water. The water-based interface agent of the present invention can improve the bonding strength and film-forming properties of new and old concrete, significantly reduce the impact of interface roughness, and is environmentally friendly.

Description

Technical Field

[0001] The invention relates to a water-based interface agent and a preparation method thereof, and belongs to the technical field of building materials. Background Art

[0002] Concrete is a major building material with excellent compressive and durable properties, abundant raw materials, and low price. However, due to its poor ductility, concrete structures can crack and seep, resulting in reduced bearing capacity and durability. Therefore, regular maintenance and repair of concrete structures are necessary. During this process, problems with the interfacial bonding between new and old concrete are discovered. Using existing interfacial agents to assist in repair can cause hollowing, cracking, and spalling. This is due to the insufficient bonding strength of the interfacial agent to the new and old concrete, resulting in poor repair results. Therefore, there is an urgent need to develop a water-based interfacial agent and its preparation method to enhance the bonding strength of the interfacial agent to the new and old concrete, improve its film-forming properties, and be environmentally friendly. Summary of the Invention

[0003] In order to at least address one problem existing in the above-mentioned prior art, the present invention provides a water-based interface agent and a preparation method thereof. The water-based interface agent can improve its bonding strength and film-forming properties to new and old concrete, greatly reduce the impact of interface roughness, and is green and environmentally friendly.

[0004] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a water-based interface agent, comprising the following raw materials, calculated by weight: 23 to 30 parts of bisphenol A epoxy resin, 13 to 18 parts of acrylic emulsion, 9 to 13 parts of silicone resin, 8 to 12 parts of polyvinyl alcohol resin, 16 to 24 parts of nanofiller, 0.9 to 1.6 parts of emulsifier, 4 to 6 parts of auxiliary agent and 15 to 22 parts of water.

[0005] Preferably, in the aqueous interface agent, the sum of the weight parts of bisphenol A epoxy resin, acrylic emulsion, silicone resin, polyvinyl alcohol resin, nanofiller, emulsifier, auxiliary agent and water is 100.

[0006] Preferably, the nanofiller is nano diatomaceous earth or nano bentonite.

[0007] Preferably, the particle size of the nanofiller is 50 nm to 100 nm.

[0008] Preferably, the emulsifier consists of sodium rosinate and sodium polyethylene glycol sulfonate.

[0009] Preferably, the mass ratio of sodium rosinate to sodium polyethylene glycol sulfonate is 1.1:(0.4-0.5).

[0010] Preferably, the auxiliary agent includes a curing agent, a mildew preventer and an antioxidant.

[0011] Preferably, the mass ratio of the curing agent to the mildew inhibitor and the antioxidant is (1.5-2):0.3:0.2.

[0012] Preferably, the curing agent is a polyamide curing agent.

[0013] Preferably, the polyamide curing agent is polyamide 650 or polyamide 651.

[0014] Preferably, the mildew inhibitor is one of lignin, chitosan and zeolite powder.

[0015] Preferably, the antioxidant is trinonylphenyl phosphite or triphenyl phosphite; preferably trinonylphenyl phosphite.

[0016] The present invention also provides a method for preparing an aqueous interface agent, comprising the following steps:

[0017] (1) adding bisphenol A epoxy resin, silicone resin, and polyvinyl alcohol resin to acrylic emulsion, stirring at a temperature of 35 to 40° C., mixing uniformly, adding emulsifier and water, stirring at high speed to emulsify, and obtaining an emulsion;

[0018] (2) Add nanofiller to the emulsion, stir at low speed to disperse evenly, then add auxiliary agent, stir at low speed to obtain water-based interface agent.

[0019] Preferably, the rotation speed of the high-speed stirring is 1800-2200 rpm.

[0020] Preferably, the rotation speed of the low-speed stirring is 400-600 rpm.

[0021] The beneficial effects of the present invention are as follows: 1. The water-based interface agent of the present invention contains bisphenol A epoxy resin, silicone resin, polyvinyl alcohol resin, acrylic emulsion, and emulsifier and has a specific weight ratio. The synergistic effect of multiple substances makes the water-based interface agent have excellent bonding strength and film-forming properties, thereby increasing the bonding strength of the interface agent to new and old concrete.

[0022] 2. The emulsifier used in the water-based interface agent of the present invention is composed of sodium rosinate and sodium polyethylene glycol sulfonate, which makes the dispersion between bisphenol A epoxy resin, silicone resin, polyvinyl alcohol resin, and acrylic emulsion more uniform and enhances the bonding strength between them, so that the water-based interface agent has good strength and toughness, strong tensile and impact resistance, and excellent and stable performance.

[0023] 3. The water-based interface agent of the present invention also adds filler nano-diatomaceous earth or nano-bentonite, which, under the action of the emulsifier, reduces the influence of the interface roughness, makes the water-based interface agent more compatible with the concrete, increases the penetration depth of the interface agent, thereby forming a denser bonding layer, and effectively improving the bonding strength between new and old concrete. DETAILED DESCRIPTION

[0024] The following is a clear and complete description of the technical solutions in the implementation of the present invention. The described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative work are within the scope of protection of the present invention. If specific conditions are not specified in the embodiments, they are carried out according to conventional conditions or the conditions recommended by the manufacturer. If the manufacturer of the reagents, instruments, and components is not specified, they are all conventional products that can be purchased commercially.

[0025] Example 1

[0026] A water-based interface agent comprises the following raw materials, calculated in parts by weight: 23 parts of bisphenol A epoxy resin, 13 parts of acrylic emulsion, 9 parts of silicone resin, 8 parts of polyvinyl alcohol resin, 16 parts of nano-diatomaceous earth with a particle size of 50 nm to 100 nm, 0.9 parts of emulsifier, 4 parts of auxiliary agent, and 15 parts of water; the emulsifier comprises 0.66 parts of sodium rosinate and 0.24 parts of sodium polyethylene glycol sulfonate; the auxiliary agent comprises 3 parts of polyamide 650, 0.6 parts of chitosan, and 0.4 parts of trinonylphenyl phosphite;

[0027] The specific preparation method of the water-based interface agent is as follows:

[0028] (1) adding the above-mentioned bisphenol A epoxy resin, silicone resin and polyvinyl alcohol resin to an acrylic emulsion, stirring at a temperature of 35 to 40° C. to mix uniformly, then adding the above-mentioned sodium rosinate, sodium polyethylene glycol sulfonate and water, and emulsifying the mixture at a high speed of 1800 rpm to obtain an emulsion;

[0029] (2) Add the above-mentioned nano-diatomaceous earth to the emulsion, stir and disperse it evenly at a low speed of 400 rpm, then add the above-mentioned polyamide 650, chitosan and trisnonylphenyl phosphite, stir and disperse it evenly at a low speed of 400 rpm to obtain a water-based interface agent.

[0030] Example 2

[0031] A water-based interface agent comprises the following raw materials, measured in parts by weight: 26 parts of bisphenol A epoxy resin, 16 parts of acrylic emulsion, 11 parts of silicone resin, 10 parts of polyvinyl alcohol resin, 20 parts of nano-diatomaceous earth with a particle size of 50 nm to 100 nm, 1.24 parts of emulsifier, 4.95 parts of auxiliary agent, and 19 parts of water; the emulsifier comprises 0.88 parts of sodium rosinate and 0.36 parts of sodium polyethylene glycol sulfonate; the auxiliary agent comprises 3.85 parts of polyamide 650, 0.66 parts of chitosan, and 0.44 parts of trinonylphenyl phosphite;

[0032] The specific preparation method of the water-based interface agent is as follows:

[0033] (1) adding the above-mentioned bisphenol A epoxy resin, silicone resin and polyvinyl alcohol resin to an acrylic emulsion, stirring at a temperature of 35 to 40° C. to mix uniformly, then adding the above-mentioned sodium rosinate, sodium polyethylene glycol sulfonate and water, and emulsifying at a high speed of 2000 rpm to obtain an emulsion;

[0034] (2) Add the above-mentioned nano-diatomaceous earth to the emulsion, stir and disperse it evenly at a low speed of 500 rpm, then add the above-mentioned polyamide 650, chitosan and trisnonylphenyl phosphite, stir and disperse it evenly at a low speed of 500 rpm to obtain a water-based interface agent.

[0035] Example 3

[0036] A water-based interface agent comprises the following raw materials, measured in parts by weight: 30 parts of bisphenol A epoxy resin, 18 parts of acrylic emulsion, 13 parts of silicone resin, 12 parts of polyvinyl alcohol resin, 24 parts of nano-diatomaceous earth with a particle size of 50 nm to 100 nm, 1.6 parts of emulsifier, 6 parts of auxiliary agent, and 22 parts of water; the emulsifier comprises 1.1 parts of sodium rosinate and 0.5 parts of sodium polyethylene glycol sulfonate; the auxiliary agent comprises 4.8 parts of polyamide 650, 0.72 parts of chitosan, and 0.48 parts of trinonylphenyl phosphite;

[0037] The specific preparation method of the water-based interface agent is as follows:

[0038] (1) adding the above-mentioned bisphenol A epoxy resin, silicone resin and polyvinyl alcohol resin to an acrylic emulsion, stirring at a temperature of 35 to 40° C. to mix uniformly, then adding the above-mentioned sodium rosinate, sodium polyethylene glycol sulfonate and water, and emulsifying at a high speed of 2200 rpm to obtain an emulsion;

[0039] (2) Add the above-mentioned nano-diatomaceous earth to the emulsion, stir and disperse it evenly at a low speed of 600 rpm, then add the above-mentioned polyamide 650, chitosan and trisnonylphenyl phosphite, stir and disperse it evenly at a low speed of 600 rpm to obtain a water-based interface agent.

[0040] Example 4

[0041] A water-based interface agent comprises the following raw materials, measured in parts by weight: 23 parts of bisphenol A epoxy resin, 15 parts of acrylic emulsion, 13 parts of silicone resin, 12 parts of polyvinyl alcohol resin, 17.1 parts of nano-bentonite with a particle size of 50 nm to 100 nm, 0.9 parts of emulsifier, 4 parts of auxiliary agent, and 15 parts of water; the emulsifier comprises 0.66 parts of sodium rosinate and 0.24 parts of sodium polyethylene glycol sulfonate; the auxiliary agent comprises 3 parts of polyamide 650, 0.6 parts of chitosan, and 0.4 parts of trinonylphenyl phosphite;

[0042] The specific preparation method of the aqueous interface agent is the same as that in Example 1.

[0043] Example 5

[0044] A water-based interface agent comprises the following raw materials, measured in parts by weight: 23 parts of bisphenol A epoxy resin, 18 parts of acrylic emulsion, 12 parts of silicone resin, 11.1 parts of polyvinyl alcohol resin, 16 parts of nano-diatomaceous earth with a particle size of 50 nm to 100 nm, 0.9 parts of emulsifier, 4 parts of auxiliary agent, and 15 parts of water; the emulsifier comprises 0.66 parts of sodium rosinate and 0.24 parts of sodium polyethylene glycol sulfonate; the auxiliary agent comprises 3.2 parts of polyamide 650, 0.48 parts of chitosan, and 0.32 parts of trinonylphenyl phosphite;

[0045] The specific preparation method of the aqueous interface agent is the same as that in Example 1.

[0046] Example 6

[0047] A water-based interface agent comprises the following raw materials, measured in parts by weight: 23 parts of bisphenol A epoxy resin, 13 parts of acrylic emulsion, 9 parts of silicone resin, 8 parts of polyvinyl alcohol resin, 24 parts of nano-diatomaceous earth with a particle size of 50 nm to 100 nm, 0.9 parts of emulsifier, 4 parts of auxiliary agent, and 15 parts of water; the emulsifier comprises 0.66 parts of sodium rosinate and 0.24 parts of sodium polyethylene glycol sulfonate; the auxiliary agent comprises 3 parts of polyamide 651, 0.6 parts of zeolite powder, and 0.4 parts of triphenyl phosphite;

[0048] The specific preparation method of the aqueous interface agent is the same as that in Example 1.

[0049] Example 7

[0050] A water-based interface agent comprises the following raw materials, measured in parts by weight: 23.1 parts of bisphenol A epoxy resin, 13 parts of acrylic emulsion, 9 parts of silicone resin, 8 parts of polyvinyl alcohol resin, 20 parts of nano-bentonite with a particle size of 50 nm to 100 nm, 0.9 parts of emulsifier, 4 parts of auxiliary agent, and 22 parts of water; the emulsifier comprises 0.66 parts of sodium rosinate and 0.24 parts of sodium polyethylene glycol sulfonate; the auxiliary agent comprises 3 parts of polyamide 650, 0.6 parts of zeolite powder, and 0.4 parts of trinonylphenyl phosphite;

[0051] The specific preparation method of the aqueous interface agent is the same as that in Example 1.

[0052] Example 8

[0053] A water-based interface agent comprises the following raw materials, measured in parts by weight: 26 parts of bisphenol A epoxy resin, 13.41 parts of acrylic emulsion, 11 parts of silicone resin, 10 parts of polyvinyl alcohol resin, 18.4 parts of nano-diatomaceous earth with a particle size of 50 nm to 100 nm, 1.24 parts of emulsifier, 4.95 parts of auxiliary agent, and 19 parts of water; the emulsifier comprises 0.88 parts of sodium rosinate and 0.36 parts of sodium polyethylene glycol sulfonate; the auxiliary agent comprises 3.85 parts of polyamide 650, 0.66 parts of chitosan, and 0.44 parts of trinonylphenyl phosphite;

[0054] The specific preparation method of the aqueous interface agent is the same as that in Example 2.

[0055] Example 9

[0056] A water-based interface agent comprises the following raw materials, measured in parts by weight: 30 parts of bisphenol A epoxy resin, 13 parts of acrylic emulsion, 9 parts of silicone resin, 8 parts of polyvinyl alcohol resin, 17 parts of nano-diatomaceous earth with a particle size of 50 nm to 100 nm, 1.6 parts of emulsifier, 6 parts of auxiliary agent, and 22 parts of water; the emulsifier comprises 1.1 parts of sodium rosinate and 0.5 parts of sodium polyethylene glycol sulfonate; the auxiliary agent comprises 4.8 parts of polyamide 650, 0.72 parts of chitosan, and 0.48 parts of trinonylphenyl phosphite;

[0057] The specific preparation method of the aqueous interface agent is the same as that in Example 3.

[0058] Example 10

[0059] A water-based interface agent comprises the following raw materials, measured in parts by weight: 23 parts of bisphenol A epoxy resin, 15 parts of acrylic emulsion, 10 parts of silicone resin, 9 parts of polyvinyl alcohol resin, 16 parts of nano-bentonite with a particle size of 50 nm to 100 nm, 1.6 parts of emulsifier, 6 parts of auxiliary agent, and 20.4 parts of water; the emulsifier comprises 1.1 parts of sodium rosinate and 0.5 parts of sodium polyethylene glycol sulfonate; the auxiliary agent comprises 3.75 parts of polyamide 651, 0.75 parts of chitosan, and 0.5 parts of triphenyl phosphite;

[0060] The specific preparation method of the aqueous interface agent is the same as that in Example 2.

[0061] Example 11

[0062] A water-based interface agent, the raw materials and their weight parts are the same as those in Example 5, except that: the emulsifier contains 0.45 parts of sodium rosinate and 0.45 parts of sodium polyethylene glycol sulfonate;

[0063] The specific preparation method of the aqueous interface agent is the same as that in Example 5.

[0064] Comparative Example 1

[0065] A water-based interface agent comprises the following raw materials, calculated in parts by weight: 35 parts of bisphenol A epoxy resin, 18 parts of acrylic emulsion, 11.1 parts of polyvinyl alcohol resin, 16 parts of nano-diatomaceous earth with a particle size of 50 nm to 100 nm, 0.9 parts of emulsifier, 4 parts of auxiliary agent, and 15 parts of water; the emulsifier comprises 0.66 parts of sodium rosinate and 0.24 parts of sodium polyethylene glycol sulfonate; the auxiliary agent comprises 3.2 parts of polyamide 650, 0.48 parts of chitosan, and 0.32 parts of trisnonylphenyl phosphite; the water-based interface agent does not contain silicone resin;

[0066] The specific preparation method of the aqueous interface agent is the same as that in Example 5.

[0067] Comparative Example 2

[0068] A water-based interface agent comprises the following raw materials, measured in parts by weight: 33 parts of bisphenol A epoxy resin, 8 parts of acrylic emulsion, 12 parts of silicone resin, 11.1 parts of polyvinyl alcohol resin, 16 parts of nano-diatomaceous earth with a particle size of 50 nm to 100 nm, 0.9 parts of emulsifier, 4 parts of auxiliary agent, and 15 parts of water; the emulsifier comprises 0.66 parts of sodium rosinate and 0.24 parts of sodium polyethylene glycol sulfonate; the auxiliary agent comprises 3.2 parts of polyamide 650, 0.48 parts of chitosan, and 0.32 parts of trinonylphenyl phosphite;

[0069] The specific preparation method of the aqueous interface agent is the same as that in Example 5.

[0070] Comparative Example 3

[0071] A water-based interface agent comprises the following raw materials, calculated in parts by weight: 34.1 parts of bisphenol A epoxy resin, 18 parts of acrylic emulsion, 12 parts of silicone resin, 16 parts of nano-diatomaceous earth with a particle size of 50 nm to 100 nm, 0.9 parts of emulsifier, 4 parts of auxiliary agent, and 15 parts of water; the emulsifier comprises 0.66 parts of sodium rosinate and 0.24 parts of sodium polyethylene glycol sulfonate; the auxiliary agent comprises 3.2 parts of polyamide 650, 0.48 parts of chitosan, and 0.32 parts of trisnonylphenyl phosphite; the water-based interface agent does not contain polyvinyl alcohol resin;

[0072] The specific preparation method of the aqueous interface agent is the same as that in Example 5.

[0073] Comparative Example 4

[0074] A water-based interface agent, the raw materials and weight parts thereof are the same as those in Example 5, except that nano-quartz sand replaces nano-diatomaceous earth;

[0075] The specific preparation method of the aqueous interface agent is the same as that in Example 5.

[0076] Comparative Example 5

[0077] A water-based interface agent comprises the following raw materials, measured in parts by weight: 23 parts of bisphenol A epoxy resin, 13 parts of acrylic emulsion, 12 parts of silicone resin, 11.1 parts of polyvinyl alcohol resin, 27 parts of nano-diatomaceous earth with a particle size of 50 nm to 100 nm, 0.9 parts of emulsifier, 4 parts of auxiliary agent, and 15 parts of water; the emulsifier comprises 0.66 parts of sodium rosinate and 0.24 parts of sodium polyethylene glycol sulfonate; the auxiliary agent comprises 3.2 parts of polyamide 650, 0.48 parts of chitosan, and 0.32 parts of trinonylphenyl phosphite;

[0078] The specific preparation method of the aqueous interface agent is the same as that in Example 5.

[0079] Comparative Example 6

[0080] A water-based interface agent, the raw materials and weight parts thereof are the same as those in Example 5, except that: the diatomaceous earth has a particle size of 0.2 to 0.5 μm;

[0081] The specific preparation method of the aqueous interface agent is the same as that in Example 5.

[0082] Comparative Example 7

[0083] A water-based interface agent, the raw materials and weight parts thereof are the same as those in Example 5, except that the emulsifier is only 0.9 parts of sodium rosinate;

[0084] The specific preparation method of the aqueous interface agent is the same as that in Example 5.

[0085] Comparative Example 8

[0086] A water-based interface agent, the raw materials and weight parts thereof are the same as those in Example 5, except that the emulsifier is only 0.9 parts of sodium polyethylene glycol sulfonate;

[0087] The specific preparation method of the aqueous interface agent is the same as that in Example 5.

[0088] Comparative Example 9

[0089] An aqueous interface agent, the raw materials and their weight parts are the same as those in Example 5, except that: 0.66 parts of Span 60 and 0.24 parts of sodium polyethylene glycol sulfonate are used as the emulsifier;

[0090] The specific preparation method of the aqueous interface agent is the same as that in Example 5.

[0091] Effect test

[0092] 1. Performance test: The interface between the new and old mortars was surface treated, striped with a stone cutter, brushed and cleaned with a wire brush, and the performance of the water-based interface agents of Examples 1 to 11 and Comparative Examples 1 to 9 was tested according to the standard JC / T907-2002 "Concrete interface treatment agent". The results are shown in Table 1.

[0093] Table 1

[0094]

[0095]

[0096] 2. Influence of interface roughness: Two surface treatments were performed on the interface between the new and old mortars: the first treatment method was to scratch the surface with a stone cutter, brush the surface with a wire brush, and then clean it, which was interface I; the second treatment method was to only brush the surface with a wire brush and then clean it, which was interface II. According to the standard JC / T907-2002 "Concrete interface treatment agent", the tensile bond strength of the water-based interface agents of Examples 1 to 11 and Comparative Examples 1 to 9 was tested, and the results are shown in Table 2.

[0097] Table 2 Influence of interface roughness

[0098]

[0099] As can be seen from Tables 1 and 2, in the absence of the synergistic effect of silicone resin, polyvinyl alcohol resin acrylic emulsion and bisphenol A epoxy resin, the water-based interface agent has weak bonding strength and poor durability. The selection of quartz sand or nano-diatomaceous earth with too large a particle size still does not improve the performance. Moreover, the use of only sodium rosinate or an emulsifier without sodium rosinate does not improve the performance. The water-based interface agents prepared in Examples 1 to 11 contain bisphenol A epoxy resin, silicone resin, polyvinyl alcohol resin, acrylic emulsion, and an emulsifier composed of sodium rosinate and sodium polyethylene glycol sulfonate in appropriate weights. After mixing, the synergistic effect of multiple substances gives the water-based interface agent excellent bonding strength and film-forming properties, thereby increasing the bonding strength of the interface agent to new and old concrete. In particular, when the sum of the weight parts of the raw materials is 100, the water-based interface agent prepared by the present invention has stronger bonding strength and higher mechanical properties.

[0100] In addition, the selection of fillers and their particle size, as well as the appropriate amount of sodium rosinate in the emulsifier, are all greatly affected by the roughness of the interface surface. At a relatively smooth interface, the adhesive force is reduced to varying degrees. Examples 1 to 11 select appropriate fillers and emulsifiers containing an appropriate amount of sodium rosinate for synergistic coordination. The water-based interface agent of the present invention is less affected by the roughness of the interface surface and has stronger adaptability.

[0101] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be embodied in other specific forms without departing from the spirit and essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations that come within the meaning and range of equivalents of the claims be embraced therein.

[0102] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A water-based interface agent, characterized in that The invention comprises the following raw materials, calculated by weight: 23-30 parts of bisphenol A epoxy resin, 13-18 parts of acrylic emulsion, 9-13 parts of silicone resin, 8-12 parts of polyvinyl alcohol resin, 16-24 parts of nanofiller, 0.9-1.6 parts of emulsifier, 4-6 parts of auxiliary agent and 15-22 parts of water; The nanofiller is nano diatomite or nano bentonite with a particle size of 50nm to 100nm; The emulsifier consists of sodium rosinate and sodium polyethylene glycol sulfonate; The mass ratio of the sodium rosinate to the sodium polyethylene glycol sulfonate is 1.1:(0.4-0.5).

2. A water-based interface agent according to claim 1, characterized in that: In the aqueous interface agent, the sum of the weight parts of the bisphenol A epoxy resin, acrylic emulsion, silicone resin, polyvinyl alcohol resin, nano filler, emulsifier, auxiliary agent and water is 100.

3. A water-based interface agent according to claim 1, characterized in that: The auxiliary agents include a curing agent, a mildew preventer and an antioxidant.

4. The aqueous interface agent according to claim 1, characterized in that: The mass ratio of the curing agent to the mildew inhibitor and the antioxidant is (1.5-2):0.3:0.

2.

5. A water-based interface agent according to claim 3 or 4, characterized in that: The curing agent is a polyamide curing agent; the mildew inhibitor is one of lignin, chitosan or zeolite powder; and the antioxidant is trinonylphenyl phosphite or triphenyl phosphite.

6. A water-based interface agent according to claim 5, characterized in that: The polyamide curing agent is polyamide 650 or polyamide 651.

7. A method for preparing the aqueous interface agent according to claim 1, characterized in that: The following steps are involved: (1) Add bisphenol A epoxy resin, silicone resin, and polyvinyl alcohol resin to acrylic emulsion, stir at a temperature of 35-40°C, mix evenly, add emulsifier and water, stir and emulsify at a speed of 1800-2200 rpm to obtain an emulsion; (2) Add nanofiller to the emulsion and stir at a speed of 400-600 rpm to disperse it evenly. Then add the additive and stir at a speed of 400-600 rpm to obtain a water-based interface agent.

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