Water-based interface agent and preparation method thereof

Abstract

The invention discloses a water-based interface agent and a preparation method thereof, and belongs to the technical field of building materials, and the water-based interface agent comprises the following raw materials in parts by weight: 23-30 parts of bisphenol A epoxy resin, 13-18 parts of an acrylic emulsion, 9-13 parts of organic silicon resin, 8-12 parts of polyvinyl alcohol resin, 16-24 parts of a nano filler, 0.9-1.6 parts of an emulsifier, 4-6 parts of an auxiliary agent and 15-22 parts of water. The water-based interface agent can improve the bonding strength and film-forming property of the water-based interface agent to new and old concrete, greatly reduces the influence of interface roughness, and is green and environment-friendly.

Description

Technical Field

[0001] The present invention relates to an aqueous interface agent and a preparation method thereof, belonging to the technical field of building materials. Background Art

[0002] Concrete is the most important building material with good compressive and durability properties, abundant raw materials and low price. However, due to its poor extensibility, the concrete structure will show cracking and water seepage phenomena, resulting in a reduction in the bearing capacity and durability of the concrete. Therefore, it is necessary to regularly maintain and repair the concrete structure. In this process, it is found that there is an interface bonding problem between new and old concrete. When using existing interface agents to assist in the repair, phenomena such as hollowing, cracking, and peeling will occur. This is because the bonding strength of the interface agent to new and old concrete is insufficient, resulting in a poor repair effect. Therefore, it is urgent to develop an aqueous interface agent and a preparation method thereof to enhance the bonding strength of the interface agent to new and old concrete, improve its film-forming property, and be green and environmentally friendly. Summary of the Invention

[0003] At least aiming at one of the above problems existing in the prior art, the present invention provides an aqueous interface agent and a preparation method thereof. The aqueous interface agent can improve its bonding strength and film-forming property to new and old concrete, greatly reduce the influence of the interface roughness, and is green and environmentally friendly.

[0004] To achieve the above object, the present invention adopts the following technical scheme: An aqueous interface agent, comprising the following raw materials, 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 nano filler, 0.9 - 1.6 parts of emulsifier, 4 - 6 parts of auxiliary agent, and 15 - 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, nano filler, emulsifier, auxiliary agent and water is 100.

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

[0007] Preferably, the particle size of the nano filler is 50nm - 100nm.

[0008] Preferably, the emulsifier is composed of sodium rosinate and sodium polyethyleneglycol sulfonate.

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

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

[0011] Preferably, the mass ratio of the curing agent, the mildew-proof agent 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 one of polyamide 650 or polyamide 651.

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

[0015] Preferably, the antioxidant is tris(nonylphenyl) phosphite or triphenyl phosphite; preferably tris(nonylphenyl) phosphite.

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

[0017] (1) Add bisphenol A epoxy resin, silicone resin, and polyvinyl alcohol resin to the acrylic emulsion, stir at a temperature of 35 - 40 °C until evenly mixed, then add an emulsifier and water, and stir at high speed for emulsification to obtain an emulsion;

[0018] (2) Add nano-fillers to the emulsion, stir at low speed until evenly dispersed, then add additives, and stir at low speed until evenly mixed to obtain an aqueous 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 aqueous interface agent of the present invention contains bisphenol A epoxy resin, silicone resin, polyvinyl alcohol resin, acrylic emulsion, and an emulsifier and has a specific weight ratio. The synergistic effect of multiple substances makes the aqueous interface agent have excellent bonding strength and film-forming property, increasing the bonding strength of the interface agent to new and old concrete.

[0022] 2. The emulsifier used in the aqueous interface agent of the present invention is composed of sodium rosinate and sodium poly(ethylene glycol) sulfonate, which makes the dispersion of bisphenol A epoxy resin, silicone resin, polyvinyl alcohol resin, and acrylic emulsion more uniform, and enhances the bonding strength between them, making the aqueous interface agent have good strength and toughness, strong tensile and impact resistance, and excellent and stable performance.

[0023] 3. The aqueous interface agent of the present invention also adds nano-fillers such as nano-diatomaceous earth or nano-bentonite. Under the action of the emulsifier, the influence of the interface roughness is reduced, the compatibility of the aqueous interface agent with concrete is better, the penetration depth of the interface agent is increased, and thus a denser bonding layer is formed, effectively improving the bonding strength of new and old concrete. Detailed Embodiments

[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 embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention. For those conditions not specified in the embodiments, they are carried out according to conventional conditions or the conditions recommended by the manufacturer. For the reagents, instruments, or components not specified by the manufacturer, they are all conventional products that can be obtained through commercial purchase.

[0025] Embodiment 1

[0026] An aqueous interface agent, comprising the following raw materials, 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 part of emulsifier, 4 parts of auxiliary agent, and 15 parts of water; 0.66 part of sodium rosinate and 0.24 part of sodium polyglycol sulfonate in the emulsifier; 3 parts of polyamide 650, 0.6 part of chitosan, and 0.4 part of tris(nonylphenyl) phosphite in the auxiliary agent;

[0027] The specific preparation method of the aqueous interface agent is as follows:

[0028] (1) Add the above-mentioned bisphenol A epoxy resin, silicone resin, and polyvinyl alcohol resin to the acrylic emulsion, stir at a temperature of 35 - 40 °C, mix evenly, then add the above-mentioned sodium rosinate, sodium polyglycol sulfonate, and water, and stir and emulsify 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 evenly at a low speed of 400 rpm, then add the above-mentioned polyamide 650, chitosan, and tris(nonylphenyl) phosphite, and stir evenly at a low speed of 400 rpm to obtain the aqueous interface agent.

[0030] Embodiment 2

[0031] An aqueous interface agent, comprising the following raw materials, 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; 0.88 part of sodium rosinate and 0.36 part of sodium polyglycol sulfonate in the emulsifier; 3.85 parts of polyamide 650, 0.66 part of chitosan, and 0.44 part of tris(nonylphenyl) phosphite in the auxiliary agent;

[0032] The specific preparation method of the aqueous interface agent is as follows:

[0033] (1) Add the above-mentioned bisphenol A epoxy resin, silicone resin, and polyvinyl alcohol resin to the acrylic emulsion, stir at a temperature of 35-40 °C, mix evenly, then add the above-mentioned sodium rosinate, sodium polyglycol sulfonate, and water, and stir and emulsify at a high speed of 2000 rpm to obtain an emulsion.

[0034] (2) Add the above-mentioned nano-diatomite to the emulsion, stir and disperse evenly at a low speed of 500 rpm, then add the above-mentioned polyamide 650, chitosan, and tris(nonylphenyl) phosphite, and stir evenly at a low speed of 500 rpm to obtain an aqueous interface agent.

[0035] Example 3

[0036] An aqueous interface agent, comprising the following raw materials, 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-diatomite 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; 1.1 parts of sodium rosinate and 0.5 parts of sodium polyglycol sulfonate in the emulsifier; 4.8 parts of polyamide 650, 0.72 parts of chitosan, and 0.48 parts of tris(nonylphenyl) phosphite in the auxiliary agent;

[0037] The specific preparation method of the aqueous interface agent is as follows:

[0038] (1) Add the above-mentioned bisphenol A epoxy resin, silicone resin, and polyvinyl alcohol resin to the acrylic emulsion, stir at a temperature of 35-40 °C, mix evenly, then add the above-mentioned sodium rosinate, sodium polyglycol sulfonate, and water, and stir and emulsify at a high speed of 2200 rpm to obtain an emulsion.

[0039] (2) Add the above-mentioned nano-diatomite to the emulsion, stir and disperse evenly at a low speed of 600 rpm, then add the above-mentioned polyamide 650, chitosan, and tris(nonylphenyl) phosphite, and stir evenly at a low speed of 600 rpm to obtain an aqueous interface agent.

[0040] Example 4

[0041] An aqueous interface agent, comprising the following raw materials, 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; 0.66 parts of sodium rosinate and 0.24 parts of sodium polyglycol sulfonate in the emulsifier; 3 parts of polyamide 650, 0.6 parts of chitosan, and 0.4 parts of tris(nonylphenyl) phosphite in the auxiliary agent;

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

[0043] Example 5

[0044] An aqueous interface agent, comprising the following raw materials, 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-diatomite with a particle size of 50nm - 100nm, 0.9 part of emulsifier, 4 parts of auxiliary agent and 15 parts of water; 0.66 part of sodium rosinate and 0.24 part of sodium polyglycol sulfonate in the emulsifier; 3.2 parts of polyamide 650, 0.48 part of chitosan and 0.32 part of tris(nonylphenyl) phosphite in the auxiliary agent;

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

[0046] Example 6

[0047] An aqueous interface agent, comprising the following raw materials, 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-diatomite with a particle size of 50nm - 100nm, 0.9 part of emulsifier, 4 parts of auxiliary agent and 15 parts of water; 0.66 part of sodium rosinate and 0.24 part of sodium polyglycol sulfonate in the emulsifier; 3 parts of polyamide 651, 0.6 part of zeolite powder and 0.4 part of triphenyl phosphite in the auxiliary agent;

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

[0049] Example 7

[0050] An aqueous interface agent, comprising the following raw materials, 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 50nm - 100nm, 0.9 part of emulsifier, 4 parts of auxiliary agent and 22 parts of water; 0.66 part of sodium rosinate and 0.24 part of sodium polyglycol sulfonate in the emulsifier; 3 parts of polyamide 650, 0.6 part of zeolite powder and 0.4 part of tris(nonylphenyl) phosphite in the auxiliary agent;

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

[0052] Example 8

[0053] An aqueous interface agent, comprising the following raw materials, 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; 0.88 part of sodium rosinate and 0.36 part of sodium polyglycol sulfonate in the emulsifier; 3.85 parts of polyamide 650, 0.66 part of chitosan, and 0.44 part of tris(nonylphenyl) phosphite in the auxiliary agent;

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

[0055] Example 9

[0056] An aqueous interface agent, comprising the following raw materials, 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; 1.1 part of sodium rosinate and 0.5 part of sodium polyglycol sulfonate in the emulsifier; 4.8 parts of polyamide 650, 0.72 part of chitosan, and 0.48 part of tris(nonylphenyl) phosphite in the auxiliary agent;

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

[0058] Example 10

[0059] An aqueous interface agent, comprising the following raw materials, 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; 1.1 part of sodium rosinate and 0.5 part of sodium polyglycol sulfonate in the emulsifier; 3.75 parts of polyamide 651, 0.75 part of chitosan, and 0.5 part of triphenyl phosphite in the auxiliary agent;

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

[0061] Example 11

[0062] An aqueous interface agent, the raw materials and their parts by weight are partially the same as those of Example 5, the difference lies in: 0.45 part of sodium rosinate and 0.45 part of sodium polyglycol sulfonate in the emulsifier;

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

[0064] Comparative Example 1

[0065] An aqueous interface agent, comprising the following raw materials, 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-diatomite with a particle size of 50 nm to 100 nm, 0.9 part of emulsifier, 4 parts of auxiliary agent, and 15 parts of water; 0.66 part of sodium rosinate and 0.24 part of sodium polyglycol sulfonate in the emulsifier; 3.2 parts of polyamide 650, 0.48 part of chitosan, and 0.32 part of tris(nonylphenyl) phosphite in the auxiliary agent; the aqueous interface agent does not contain silicone resin;

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

[0067] Comparative Example 2

[0068] An aqueous interface agent, comprising the following raw materials, 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-diatomite with a particle size of 50 nm to 100 nm, 0.9 part of emulsifier, 4 parts of auxiliary agent, and 15 parts of water; 0.66 part of sodium rosinate and 0.24 part of sodium polyglycol sulfonate in the emulsifier; 3.2 parts of polyamide 650, 0.48 part of chitosan, and 0.32 part of tris(nonylphenyl) phosphite in the auxiliary agent;

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

[0070] Comparative Example 3

[0071] An aqueous interface agent, comprising the following raw materials, by weight: 34.1 parts of bisphenol A epoxy resin, 18 parts of acrylic emulsion, 12 parts of silicone resin, 16 parts of nano-diatomite with a particle size of 50 nm to 100 nm, 0.9 part of emulsifier, 4 parts of auxiliary agent, and 15 parts of water; 0.66 part of sodium rosinate and 0.24 part of sodium polyglycol sulfonate in the emulsifier; 3.2 parts of polyamide 650, 0.48 part of chitosan, and 0.32 part of tris(nonylphenyl) phosphite in the auxiliary agent; the aqueous interface agent does not contain polyvinyl alcohol resin;

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

[0073] Comparative Example 4

[0074] An aqueous interface agent, the raw materials and their parts by weight are partially the same as those in Example 5, the difference being that nano-silica sand is used instead of nano-diatomite;

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

[0076] Comparative Example 5

[0077] An aqueous interface agent, comprising the following raw materials, 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 part of emulsifier, 4 parts of auxiliary agent, and 15 parts of water; 0.66 part of sodium rosinate and 0.24 part of sodium polyglycol sulfonate in the emulsifier; 3.2 parts of polyamide 650, 0.48 part of chitosan, and 0.32 part of tris(nonylphenyl) phosphite in the auxiliary agent;

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

[0079] Comparative Example 6

[0080] An aqueous interface agent, with the raw materials and their parts by weight being partially the same as those of Example 5, except that: the diatomaceous earth has a particle size of 0.2 - 0.5 μm;

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

[0082] Comparative Example 7

[0083] An aqueous interface agent, with the raw materials and their parts by weight being partially the same as those of Example 5, except that: the emulsifier is only 0.9 part of sodium rosinate;

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

[0085] Comparative Example 8

[0086] An aqueous interface agent, with the raw materials and their parts by weight being partially the same as those of Example 5, except that: the emulsifier is only 0.9 part of sodium polyglycol sulfonate;

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

[0088] Comparative Example 9

[0089] An aqueous interface agent, with the raw materials and their parts by weight being partially the same as those of Example 5, except that: the emulsifier contains 0.66 part of span 60 and 0.24 part of sodium polyglycol sulfonate;

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

[0091] Effect test

[0092] I. Performance detection: The interface between new and old mortar is surface-treated, stripes are drawn with a stone cutting machine, brushed and cleaned with a wire brush, and according to the standard JC / T907 - 2002 "Concrete Interface Treatment Agent", then the performance of the aqueous interface agents of Examples 1 - 11 and Comparative Examples 1 - 9 is detected, and 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 use a stone cutting machine to draw stripes, and then use a wire brush to brush and clean, which is the I interface; The second treatment method was to only use a wire brush to brush and clean, which is the II interface. According to the standard JC / T907-2002 "Concrete interface treatment agent", the tensile bonding strength of the water-based interface agents of Examples 1 to 11 and Examples 1 to 9 was tested, and the results are shown in Table 2.

[0097] Table 2 Influence of interface roughness

[0098]

[0099] It can be seen from Table 1 and Table 2 that in the absence of the synergy of silicone resin, polyvinyl alcohol resin acrylic emulsion and bisphenol A epoxy resin, the bonding force of the water-based interface agent is weak and the durability is poor. The performance is still not improved by selecting quartz sand or nano-diatomaceous earth with too large a particle size; and the performance is not improved by using only sodium rosin acid or an emulsifier that does not contain sodium rosin acid; the water-based interface agent prepared in Examples 1 to 11 comprises an appropriate weight of bisphenol A epoxy resin, silicone resin, polyvinyl alcohol resin, acrylic emulsion and an emulsifier composed of sodium rosin acid and sodium polyethylene glycol sulfonate. After mixing, the synergistic effect of multiple substances makes the water-based interface agent have excellent bonding strength and film-forming properties, and increases 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 force and higher mechanical properties.

[0100] In addition, the selection of fillers and their particle sizes, and whether the amount of sodium rosin acid in the emulsifier is appropriate are all greatly affected by the roughness of the interface surface. The bonding force is reduced to varying degrees at a relatively smooth interface. Examples 1 to 11 select suitable fillers and emulsifiers containing an appropriate amount of sodium rosin acid 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] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit and basic characteristics of the present invention. Therefore, in any aspect, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention.

[0102] In addition, it should be understood that although this specification is described in terms of embodiments, not every embodiment only contains an independent technical solution. This narrative manner of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments 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 nano filler, 0.9-1.6 parts of emulsifier, 4-6 parts of auxiliary agent and 15-22 parts of water.

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 nano filler is nano diatomite or nano bentonite, and the particle size is 50nm-100nm.

4. The aqueous interface agent according to claim 1, characterized in that: The emulsifier consists of sodium rosinate and sodium polyethylene glycol sulfonate.

5. A water-based interface agent according to claim 4, characterized in that: The mass ratio of the sodium rosin acid and sodium polyethylene glycol sulfonate is 1.1:(0.4-0.5).

6. The aqueous interface agent according to claim 1, characterized in that: The auxiliary agents include a curing agent, a mildew preventer and an antioxidant.

7. 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.

8. A water-based interface agent according to claim 6 or 7, 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.

9. The aqueous interface agent according to claim 8, characterized in that: The polyamide curing agent is one of polyamide 650 and polyamide 651.

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

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