Rare earth synergistic non-expansive ultrathin fireproof heat-insulating coating and preparation method thereof

Abstract

The invention discloses a rare earth synergistic non-expansive ultrathin fireproof heat-insulating coating and a preparation method thereof, the rare earth synergistic non-expansive ultrathin fireproof heat-insulating coating is prepared by mixing a first component and a second component according to a mass ratio of 100: 10-13, the first component is prepared by mixing a water-borne epoxy resin emulsion, ethylenediamine tetra (methylene phosphonic acid) lanthanum, a filler, a dispersing agent, a defoaming agent, a leveling agent, glass fibers and deionized water, and the second component is prepared by mixing water-borne epoxy resin emulsion, ethylenediamine tetra (methylene phosphonic acid) lanthanum, a filler, a dispersing agent, a defoaming agent, a flatting agent, glass fibers and the filler is composed of ammonium polyphosphate, titanium dioxide and talcum powder; the second component is prepared by mixing a curing agent and deionized water. Through the rare earth synergistic technology and the ultra-thin non-expansion design, the thickness limitation and the performance bottleneck of a traditional fireproof coating are broken through, an efficient, environment-friendly and practical solution is provided for fireproof heat-insulation protection of light-weight metal alloy in a limited space, and remarkable technical advantages and application prospects are achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of fireproof materials, and in particular relates to a rare earth synergistic non-expansion ultra-thin fireproof and heat-insulating coating and a preparation method thereof. Background Art

[0002] With the rapid development of modern industrial technology, the application of lightweight and high-strength metal alloys (such as aluminum alloys, magnesium alloys, etc.) is becoming more and more extensive, especially in the fields of new energy electric vehicles, lithium battery energy storage systems, large aircraft, etc., and their usage has increased significantly. These materials have become key components in modern engineering design due to their excellent mechanical properties and lightweight characteristics. However, this type of metal alloy generally has the defect of insufficient fire resistance. In a high-temperature open flame environment, its structure can easily be burned through in a short period of time, resulting in loss of strength and even causing safety accidents. Therefore, in order to improve the fire resistance of such materials, it is usually necessary to combine fireproofing and heat insulation measures for protection. Among them, the application of functional fire retardant coatings is considered to be one of the most effective and economical solutions at present.

[0003] In the prior art, fire retardant coatings are mainly divided into two categories: intumescent and non-intumescent. Intumescent fire retardant coatings form a porous carbon layer to insulate heat by thermal expansion. The coating thickness is usually more than 1.5 mm, and the expansion multiple can be as high as 20 times or more. For example, CN116694190A discloses an intumescent water-based epoxy steel structure fire retardant coating, which is composed of water-based epoxy resin emulsion, ammonium polyphosphate, expandable graphite, titanium dioxide, floating beads, basalt flakes, eggshell powder, rare earth oxides (lanthanum oxide and cerium oxide) and curing agent. After burning for 30 minutes, the back plate temperature of this coating exceeds 203°C, and the expansion multiple is 11.3. Although this coating improves the fire resistance to a certain extent, its higher expansion multiple and thicker coating limit its application in scenarios with limited space. On the other hand, non-intumescent fire retardant coatings achieve protection through the thermal insulation properties of the material itself, but its coating thickness is usually more than 15 mm. For example, CN118755287A discloses a highly effective, heat-insulating, non-intumescent fire-retardant coating whose main ingredients include gypsum powder, organic plastic powder, a thickener, fiber, a foaming agent, a retarder, and gel particles containing aluminum oxide and boric acid. This coating achieves good insulation at a dry film thickness of 25 mm by increasing porosity and reducing dry density. However, its thickness is still relatively high, making it unsuitable for structures with limited space.

[0004] The fire-retardant coatings mentioned above share the following common issues: First, both intumescent and non-intumescent coatings require relatively thick coatings, making them difficult to adapt to the confined spaces required for applications such as new energy electric vehicle battery packs and energy storage boxes. Second, existing coatings lack stability at high temperatures, easily degrading or collapsing due to thermal decomposition. Finally, some coatings have high thermal conductivity and limited heat conduction barrier capabilities, making them ineffective in protecting substrates from high-temperature damage. These issues are particularly prominent in the fire protection of lightweight metal alloys, necessitating a novel solution that can achieve highly effective fire protection and heat insulation with ultra-thin coatings. Summary of the Invention

[0005] The purpose of the present invention is to overcome the defects of the prior art and provide a rare earth synergistic non-expansion ultra-thin fireproof and heat-insulating coating.

[0006] Another object of the present invention is to provide a method for preparing the above-mentioned rare earth synergistic non-expansion ultra-thin fireproof and heat-insulating coating.

[0007] The technical solutions of the present invention are as follows:

[0008] A rare earth synergistic non-expanding ultra-thin fireproof and heat-insulating coating, which is prepared by mixing a first component and a second component in a mass ratio of 100:10-13, wherein:

[0009] The first component is prepared by mixing water-based epoxy resin emulsion, lanthanum ethylenediaminetetramethylenephosphonate, filler, dispersant, defoamer, leveling agent, glass fiber and deionized water. The filler is composed of ammonium polyphosphate, titanium dioxide and talc.

[0010] The second component is prepared by mixing a curing agent and deionized water.

[0011] In a preferred embodiment of the present invention, the waterborne epoxy resin emulsion has a solid content of about 50-60%, a pH value of 7-10, and an epoxy equivalent weight of 1000-1200 g / N.

[0012] More preferably, the curing agent is a brown modified phenolic amine liquid with a solid content of 40-50%, a pH value of 8-10, and an active hydrogen equivalent of 300-450 g / eq.

[0013] In a preferred embodiment of the present invention, the lanthanum ethylenediaminetetramethylenephosphonate is a white granular powder with a particle size of 20-50 μm and a thermal decomposition temperature higher than 350°C.

[0014] In a preferred embodiment of the present invention, the filler comprises: ammonium polyphosphate as a white powder with an effective content of more than 95% and a decomposition temperature higher than 350°C; titanium dioxide as a white powder with a rutile type effective content of more than 98%; and talc as a grayish white powder with a particle size of 20-40 μm and an effective content of more than 95%.

[0015] In a preferred embodiment of the present invention, the glass fiber is an alkali glass fiber resistant to 600° C., and has a length of 5-10 mm and a diameter of 5-10 μm.

[0016] In a preferred embodiment of the present invention, the distribution ratios of the first components are shown in the following table:

[0017] Components Mass percentage / % Water-based epoxy resin emulsion 25-40 Lanthanum ethylenediaminetetramethylenephosphonate 4-20 Filler: ammonium polyphosphate + titanium dioxide + talc 11-35 fiberglass 0.3-0.5 Additives: dispersant + defoamer + leveling agent 1-5 Deionized water 20-40 .

[0018] Further preferably, in the second component, the mass ratio of curing agent to deionized water is 70-91:30-39

[0019] The preparation method of the rare earth synergistic non-expansion ultra-thin fireproof and heat-insulating coating comprises the following steps:

[0020] A. preparing the first component;

[0021] (1) After deionized water and dispersant are uniformly mixed, lanthanum ethylenediaminetetramethylenephosphonate, ammonium polyphosphate, titanium dioxide and talc are added;

[0022] (2) adding zirconium beads to the material obtained in step (1) for sand grinding, and filtering to obtain a sand-milled product;

[0023] (3) fully dispersing the water-based epoxy resin emulsion, defoamer and leveling agent;

[0024] (4) adding the sand-milled material obtained in step (2) to the material obtained in step (3) and fully dispersing the mixture;

[0025] (5) adding glass fiber to the material obtained in step (4) and fully dispersing the glass fiber to obtain the first component;

[0026] B. Prepare the second component: fully disperse the curing agent and deionized water, and filter to obtain the second component;

[0027] C. Before use, mix the first component and the second component evenly.

[0028] In a preferred embodiment of the present invention, step (2) in step A is: adding zirconium beads with a diameter of 0.5 mm to the material obtained in step (1), sand-grinding the material to a fineness of less than 30 μm, and filtering the sand-grinded material.

[0029] The beneficial effects of the present invention are:

[0030] 1. The present invention is non-intumescent, with a coating thickness of only 200-400μm, far lower than the thickness requirements of traditional fire retardant coatings (e.g., intumescent coatings with a minimum of 1.5mm and non-intumescent coatings with a minimum of 15mm). This feature makes it particularly suitable for space-constrained applications, such as new energy electric vehicle battery packs, energy storage boxes, and large aircraft aluminum alloy components, providing efficient fire and heat insulation protection without taking up too much space.

[0031] 2. This invention incorporates lanthanum ethylenediaminetetramethylenephosphonate (EDTP), which reacts with ammonium polyphosphate and titanium dioxide at high temperatures to form inorganic phases such as lanthanum phosphate, lanthanum oxide, and titanium phosphate, forming a spatially interpenetrating, cross-linked honeycomb structure. This structure effectively blocks heat conduction, while the high-temperature stability of the rare earth compound enhances the coating's fire resistance, allowing it to maintain structural integrity even under extreme conditions.

[0032] 3. The high-temperature phase generated by the lanthanum ethylenediaminetetramethylenephosphonate (LDTP) in this invention exhibits a low thermal conductivity, significantly enhancing the thermal insulation performance of the coating. This property protects the substrate from burn-through in high-temperature environments and is particularly suitable for protecting low-melting-point materials such as aluminum alloys.

[0033] 4. According to tests, the present invention can protect aluminum alloy plates from being burned through at a high temperature of 1200°C for more than 10 minutes. Some embodiments (such as Example 2) have a fire resistance time of up to 15 minutes, far exceeding the existing technical level and demonstrating excellent fireproofing and heat insulation capabilities.

[0034] 5. The adhesion strength of the present invention is ≥3MPa, and there is no blistering, shedding or cracking in acid resistance (3% hydrochloric acid, 360h) and water immersion resistance (tap water, 96h), which meets the requirements of national standards and ensures the long-term stability of the coating in harsh environments.

[0035] 6. The present invention is prepared using water-based epoxy resin emulsion and curing agent, without using organic solvents. The volatile organic compound (VOC) emissions during the preparation and construction process are low, meeting environmental protection requirements and reducing potential harm to the environment and human health.

[0036] 7. The present invention is a two-component system with a simple preparation process and convenient construction. It can be applied to various substrates such as steel, aluminum alloy, magnesium alloy, etc. through conventional coating methods, thereby improving application efficiency and adaptability. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is one of the SEM images of the cross-section of the rare earth enhanced non-expanding ultra-thin fire-retardant and heat-insulating coating after fire retardation prepared in Example 2 of the present invention.

[0038] Figure 2 This is the second SEM image of the coating surface after fire resistance of the rare earth synergistic non-expanding ultra-thin fire-retardant and heat-insulating coating prepared in Example 2 of the present invention.

[0039] Figure 3 This is the XRD spectrum of the fire-resistant carbon layer of the rare earth synergistic non-expanding ultra-thin fire-retardant and heat-insulating coating prepared in Example 2 of the present invention. DETAILED DESCRIPTION

[0040] The technical solution of the present invention is further illustrated and described below through specific implementation methods in conjunction with the accompanying drawings.

[0041] In the following examples and comparative examples,

[0042] 680U dispersant, 290W defoamer and 470U leveling agent were purchased from UCAR Additives.

[0043] Waterborne epoxy resin emulsion is a milky white liquid with a solid content of about 50-60%, a pH value of 7-10, and an epoxy equivalent weight of 1000-1200g / N;

[0044] The curing agent is a brown modified phenolic amine liquid with a solid content of 40-50%, a pH value of 8-10, and an active hydrogen equivalent of 300-450g / eq;

[0045] Lanthanum ethylenediaminetetramethylenephosphonate is a white granular powder with a particle size of 20-50μm and a thermal decomposition temperature above 350℃.

[0046] Ammonium polyphosphate is a white powder with an active ingredient content of more than 95% and a decomposition temperature above 350°C; titanium dioxide is a white powder with a rutile active ingredient content of more than 98%; talc is a grayish white powder with a particle size of 20-40μm and an active ingredient content of more than 95%;

[0047] The glass fiber is an alkaline glass fiber resistant to 600°C, and has a length of 5-10 mm and a diameter of 5-10 μm.

[0048] Example 1

[0049] (1) In an iron container, add 265g of deionized water and 10g of 680U dispersant, mix well, and then add 200g of lanthanum ethylenediaminetetramethylenephosphonate, 160g of ammonium polyphosphate, 40g of titanium dioxide and 50g of talc.

[0050] (2) Add 1000 g of zirconium beads with a diameter of 0.5 mm to the material obtained in step (1), sand-grind the material until the fineness is less than 30 μm, and filter to obtain a sand-grinded material.

[0051] (3) In another iron container, add 250g of water-based epoxy resin emulsion, then add 15g of 290W defoamer and 5g of 470U leveling agent and disperse at a high speed of 1000r / min for 10min.

[0052] (4) Add the sand-milled material obtained in step (2) to the material obtained in step (3), and perform high-speed dispersion at 2000 r / min for 30 minutes.

[0053] (5) Add 5 g of glass fiber to (4) and disperse at a high speed of 2000 r / min for 10 min to obtain the first component.

[0054] (6) Add 87.5 g of curing agent and 37.5 g of ionized water into another iron container, perform high-speed dispersion at 2000 r / min for 10 min, filter, and discharge to obtain the second component of the fire retardant coating of the present invention.

[0055] (7) Before use, the first component and the second component are mixed evenly at a mass ratio of 100:12.5 to obtain the rare earth enhanced non-expanding ultra-thin fireproof and heat-insulating coating.

[0056] Table 1 below shows the specific composition ratios of the rare earth synergistic non-expanding ultra-thin fireproof and heat-insulating coating of Example 1:

[0057] Table 1

[0058]

[0059]

[0060] Example 2

[0061] (1) In an iron container, 196 g of deionized water and 5 g of 680U dispersant were added, mixed evenly, and then 120 g of lanthanum ethylenediaminetetramethylenephosphonate, 224 g of ammonium polyphosphate, 56 g of titanium dioxide, and 70 g of talc were added.

[0062] (2) Add 1000 g of zirconium beads with a diameter of 0.5 mm to the material obtained in step (1), sand-grind the material until the fineness is less than 30 μm, and filter to obtain a sand-grinded material.

[0063] (3) In another iron container, add 310g of water-based epoxy resin emulsion, then add 10g of 290W defoamer and 5g of 470U leveling agent and disperse at a high speed of 1000r / min for 10min.

[0064] (4) Add the sand-milled material obtained in step (2) to the material obtained in step (3), and perform high-speed dispersion at 2000 r / min for 30 minutes.

[0065] (5) Add 4 g of glass fiber to the material obtained in step (4), and perform high-speed dispersion at 2000 r / min for 10 min to obtain the first component.

[0066] (6) In another iron container, add 70g of curing agent and 30g of ionized water, perform high-speed dispersion at 2000r / min for 10min, and obtain the second component after filtration.

[0067] (7) Before use, the first component and the second component are mixed evenly at a mass ratio of 100:10 to obtain the rare earth synergistic non-expanding ultra-thin fireproof and heat-insulating coating.

[0068] Table 2 below shows the specific composition ratios of the rare earth synergistic non-expanding ultra-thin fireproof and heat-insulating coating of Example 2:

[0069] Table 2

[0070]

[0071]

[0072] Example 3

[0073] (1) In an iron container, 397 g of deionized water and 7 g of 680U dispersant were added, mixed evenly, and then 40 g of lanthanum ethylenediaminetetramethylenephosphonate, 96 g of ammonium polyphosphate, 24 g of titanium dioxide, and 30 g of talc were added.

[0074] (2) Add 1000 g of zirconium beads with a diameter of 0.5 mm to the material obtained in step (1), sand-grind the material until the fineness is less than 30 μm, and filter to obtain a sand-grinded material.

[0075] (3) In another iron container, add 380g of water-based epoxy resin emulsion, then add 18g of 290W defoamer and 5g of 470U leveling agent and carry out high-speed dispersion at 1000r / min for 10min.

[0076] (4) Add the sand-milled material obtained in step (2) to the material obtained in step (3), and perform high-speed dispersion at 2000 r / min for 30 minutes.

[0077] (5) Add 3 g of glass fiber to the material obtained in step (4) and perform high-speed dispersion at 2000 r / min for 10 min to obtain the first component.

[0078] (6) Add 91 g of curing agent and 39 g of ionized water into another iron container, perform high-speed dispersion at 2000 r / min for 10 min, filter, and discharge to obtain the second component of the fire retardant coating of the present invention.

[0079] (7) Before use, the first component and the second component are mixed evenly at a mass ratio of 100:13 to obtain the rare earth enhanced non-expanding ultra-thin fireproof and heat-insulating coating.

[0080] Table 3 below shows the specific composition ratios of the rare earth synergistic non-expanding ultra-thin fireproof and heat-insulating coating of Example 3:

[0081] Table 3

[0082]

[0083]

[0084] Comparative Example 1

[0085] (1) In an iron container, 316 g of deionized water and 5 g of 680U dispersant were added, mixed evenly, and then 0 g of lanthanum ethylenediaminetetramethylenephosphonate, 224 g of ammonium polyphosphate, 56 g of titanium dioxide, and 70 g of talc were added.

[0086] (2) Add 1000 g of zirconium beads with a diameter of 0.5 mm to the material obtained in step (1), sand-grind the material until the fineness is less than 30 μm, and filter to obtain a sand-grinded material.

[0087] (3) In another iron container, add 310g of water-based epoxy resin emulsion, then add 10g of 290W defoamer and 5g of 470U leveling agent and disperse at a high speed of 1000r / min for 10min.

[0088] (4) Add the sand-milled material obtained in step (2) to the material obtained in step (3), and perform high-speed dispersion at 2000 r / min for 30 minutes.

[0089] (5) Add 4 g of glass fiber to the material obtained in step (4), and perform high-speed dispersion at 2000 r / min for 10 min to obtain the first component.

[0090] (6) In another iron container, add 70g of curing agent and 30g of ionized water, perform high-speed dispersion at 2000r / min for 10min, and obtain the second component after filtration.

[0091] (7) Before use, the first component and the second component were mixed evenly at a mass ratio of 100:10 to obtain a comparative coating.

[0092] Table 4 below shows the specific composition ratio of the comparative coating of Comparative Example 1:

[0093] Table 4

[0094]

[0095]

[0096] Comparative Example 2

[0097] (1) In an iron container, add 252g of deionized water and 5g of 680U dispersant, mix well, and then add 120g of lanthanum ethylenediaminetetramethylenephosphonate, 224g of ammonium polyphosphate, 0g of titanium dioxide and 70g of talc.

[0098] (2) Add 1000 g of zirconium beads with a diameter of 0.5 mm to the material obtained in step (1), sand-grind the material until the fineness is less than 30 μm, and filter to obtain a sand-grinded material.

[0099] (3) In another iron container, add 310g of water-based epoxy resin emulsion, then add 10g of 290W defoamer and 5g of 470U leveling agent and disperse at a high speed of 1000r / min for 10min.

[0100] (4) Add the sand-milled material obtained in step (2) to the material obtained in step (3), and perform high-speed dispersion at 2000 r / min for 30 minutes.

[0101] (5) Add 4 g of glass fiber to the material obtained in step (4), and perform high-speed dispersion at 2000 r / min for 10 min to obtain the first component.

[0102] (6) In another iron container, add 70g of curing agent and 30g of ionized water, perform high-speed dispersion at 2000r / min for 10min, and obtain the second component after filtration.

[0103] (7) Before use, the first component and the second component were mixed evenly at a mass ratio of 100:10 to obtain a comparative coating.

[0104] The following table 5 shows the specific composition ratio of the comparative coating of this comparative example 2:

[0105] Table 5

[0106]

[0107]

[0108] Comparative Example 3

[0109] (1) In an iron container, 196 g of deionized water and 5 g of 680U dispersant were added, mixed evenly, and then 120 g of lanthanum ethylenediaminetetramethylenephosphonate, 300 g of ammonium polyphosphate, 56 g of titanium dioxide, and 70 g of talc were added.

[0110] (2) Add 1000 g of zirconium beads with a diameter of 0.5 mm to the material obtained in step (1), sand-grind the material until the fineness is less than 30 μm, and filter to obtain a sand-grinded material.

[0111] (3) In another iron container, add 23.4g of waterborne epoxy resin emulsion, then add 10g of 290W defoamer and 5g of 470U leveling agent and disperse at a high speed of 1000r / min for 10min.

[0112] (4) Add the sand-milled material obtained in step (2) to the material obtained in step (3), and perform high-speed dispersion at 2000 r / min for 30 minutes.

[0113] (5) Add 4 g of glass fiber to the material obtained in step (4), and perform high-speed dispersion at 2000 r / min for 10 min to obtain the first component.

[0114] (6) Add 78g of curing agent and 33g of ionized water into another iron container, perform high-speed dispersion at 2000r / min for 10min, filter, and discharge to obtain the second component of the fire retardant coating of the present invention.

[0115] (7) Before use, the first component and the second component were mixed evenly at a mass ratio of 100:11.1 to obtain a comparative coating.

[0116] Table 6 below shows the specific composition ratio of the comparative coating of Comparative Example 3:

[0117] Table 6

[0118]

[0119] Table 7 below shows the performance test results of the above embodiments and comparative examples:

[0120] Table 7

[0121]

[0122]

[0123] In addition, the rare earth enhanced non-expansion ultra-thin fireproof and heat-insulating coating prepared in Example 2 has a non-expansion interconnected cross-network structure after fire resistance, and the carbon layer has dense pores. Figure 1 The surface of the carbon layer with many small holes presents a 3D structure. Figure 2 As shown, the XRD spectrum confirms the composition structure of the compound formed after the combustion of rare earth elements. Figure 3 shown.

[0124] The above description is merely a preferred embodiment of the present invention and therefore cannot be used to limit the scope of the present invention. In other words, equivalent changes and modifications made according to the scope of the present invention and the contents of the specification should still fall within the scope of the present invention.

Claims

1. A rare earth synergistic non-expansive ultra-thin fireproof and heat-insulating coating, characterized by: The first component and the second component are mixed in a mass ratio of 100:10-13, wherein: The first component is prepared by mixing water-based epoxy resin emulsion, lanthanum ethylenediaminetetramethylenephosphonate, filler, dispersant, defoamer, leveling agent, glass fiber and deionized water. The filler is composed of ammonium polyphosphate, titanium dioxide and talc. The second component is prepared by mixing a curing agent and deionized water.

2. The rare earth synergistic non-expansive ultra-thin fireproof and heat-insulating coating according to claim 1, characterized in that: The waterborne epoxy resin emulsion has a solid content of about 50-60%, a pH value of 7-10, and an epoxy equivalent of 1000-1200 g / N.

3. The rare earth synergistic non-expansion ultra-thin fireproof and heat-insulating coating according to claim 2, characterized in that: The curing agent is a brown modified phenolic amine liquid with a solid content of 40-50%, a pH value of 8-10, and an active hydrogen equivalent of 300-450 g / eq.

4. The rare earth synergistic non-expansion ultra-thin fireproof and heat-insulating coating according to claim 1, characterized in that: The lanthanum ethylenediaminetetramethylenephosphonate is a white granular powder with a particle size of 20-50 μm and a thermal decomposition temperature higher than 350° C.

5. The rare earth synergistic non-expansion ultra-thin fireproof and heat-insulating coating according to claim 1, characterized in that: The filler comprises: ammonium polyphosphate, which is a white powder with an effective content of more than 95% and a decomposition temperature higher than 350°C; titanium dioxide, which is a white powder with a rutile type effective content of more than 98%; and talc, which is a grayish white powder with a particle size of 20-40 μm and an effective content of more than 95%.

6. The rare earth synergistic non-expansive ultra-thin fireproof and heat-insulating coating according to claim 1, characterized in that: The glass fiber is an alkaline glass fiber resistant to 600° C., and has a length of 5-10 mm and a diameter of 5-10 μm.

7. The rare earth synergistic non-expanding ultra-thin fireproof and heat-insulating coating according to any one of claims 1 to 6, characterized in that: The distribution ratio of each group in the first component is shown in the following table:

8. The rare earth synergistic non-expansive ultra-thin fireproof and heat-insulating coating according to claim 7, characterized in that: In the second component, the mass ratio of the curing agent to the deionized water is 70-91:30-39.

9. The method for preparing the rare earth synergistic non-expansive ultra-thin fireproof and heat-insulating coating according to any one of claims 1 to 8, characterized in that: The steps include: A. preparing the first component; (1) After deionized water and dispersant are uniformly mixed, lanthanum ethylenediaminetetramethylenephosphonate, ammonium polyphosphate, titanium dioxide and talc are added; (2) adding zirconium beads to the material obtained in step (1) for sand grinding, and filtering to obtain a sand-milled product; (3) fully dispersing the water-based epoxy resin emulsion, defoamer and leveling agent; (4) adding the sand-milled material obtained in step (2) to the material obtained in step (3) and fully dispersing the mixture; (5) adding glass fiber to the material obtained in step (4) and fully dispersing the glass fiber to obtain the first component; B. Prepare the second component: fully disperse the curing agent and deionized water, and filter to obtain the second component; C. Before use, mix the first component and the second component evenly.

10. The preparation method according to claim 9, wherein: Step (2) in step A is: adding zirconium beads with a diameter of 0.5 mm to the material obtained in step (1), sand-grinding the material to a fineness of less than 30 μm, and filtering the sand-grinded material.

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