An ultra-long-activated two-component epoxy primer, a preparation method and application thereof

Abstract

The application provides a super-long activation period two-component epoxy primer and a preparation method and application thereof, and belongs to the technical field of epoxy coating. The super-long activation period two-component epoxy primer comprises a separated A component and a B component; the mass ratio of the two is 1.5-2.5:1; the B component comprises 3986 curing agent, propylene glycol methyl ether and water; the A component comprises the following components in mass fraction: 35-55 parts of JT-WBE522 water-based epoxy emulsion; 1-3 parts of dispersing agent; 0.3-0.5 parts of defoaming agent; 5-10 parts of titanium white powder; 5-15 parts of mica powder; 10-15 parts of wollastonite; 5-10 parts of talc powder; 0.1-0.5 parts of carbon black; 0.2-0.5 parts of silane coupling agent; 0.5-1 part of anti-flash rust additive; 0.2-0.5 parts of thickening agent; 0.1-0.3 parts of wetting agent; 3-10 parts of cosolvent; and 10-20 parts of water. The two-component epoxy primer has a super-long activation period.

Description

Technical Field

[0001] This invention relates to the field of epoxy coating technology, and in particular to a two-component epoxy primer with an ultra-long activation period, its preparation method, and its application. Background Technology

[0002] Epoxy primers impart excellent adhesion to coatings and possess superior chemical stability and mechanical properties, making them widely applicable. In existing technologies, the activation period for most epoxy primers is 4–6 hours, with some types reaching approximately 8 hours. Certain epoxy primer coating processes require a longer activation period; for example, in transformer coating processes, an activation period of at least 12 hours is typically required. This is primarily due to the prevalent three-shift work environment in current production, necessitating at least one hour for shift handover. A shorter activation period would fail to meet practical requirements and hinder smooth production. Summary of the Invention

[0003] The purpose of this invention is to provide a two-component epoxy primer with an ultra-long activation period, its preparation method, and its application. The two-component epoxy primer provided by this invention has an ultra-long activation period.

[0004] To achieve the above-mentioned objectives, the present invention provides the following technical solution:

[0005] This invention provides a two-component epoxy primer with an ultra-long activation period, comprising a packaged component A and a component B; the mass ratio of component A to component B is 1.5 to 2.5:1;

[0006] Component B comprises 3986 curing agent, propylene glycol methyl ether, and water;

[0007] Component A comprises the following components in parts by weight: 35-55 parts of JT-WBE522 waterborne epoxy emulsion; 1-3 parts of dispersant; 0.3-0.5 parts of defoamer; 5-10 parts of titanium dioxide; 5-15 parts of mica powder; 10-15 parts of wollastonite; 5-10 parts of talc; 0.1-0.5 parts of carbon black; 0.2-0.5 parts of silane coupling agent; 0.5-1 part of anti-flash rust additive; 0.2-0.5 parts of thickener; 0.1-0.3 parts of wetting agent; 3-10 parts of cosolvent; and 10-20 parts of water.

[0008] Preferably, the mass ratio of 3986 curing agent, propylene glycol methyl ether and water in component B is 20:4-6:18-22.

[0009] Preferably, the dispersant is BYK190 dispersant and the defoamer is BYK-028 defoamer.

[0010] Preferably, the titanium dioxide is R996 rutile titanium dioxide; the mica powder is GA-4 mica powder; and the carbon black is MA-100 carbon black.

[0011] Preferably, the silane coupling agent is MP-200 silane coupling agent; the flash rust inhibitor is Raybo 60 flash rust inhibitor.

[0012] Preferably, the thickener is 0620 thickener; the wetting agent is 4100 wetting agent; and the cosolvent is dipropylene glycol butyl ether and / or dipropylene glycol methyl ether.

[0013] Preferably, the fineness of component A is ≤30μm and the solid content is ≥46wt%; the solid content of component B is ≥20wt%.

[0014] This invention provides a method for preparing the ultra-long activation period two-component epoxy primer described in the above technical solution, comprising the following steps:

[0015] Water, dispersant, mica powder, titanium dioxide, wollastonite, talc, carbon black, and a portion of defoamer are mixed and ground to obtain a grinding slurry; the grinding slurry, JT-WBE522 waterborne epoxy emulsion, cosolvent, thickener, wetting agent, silane coupling agent, anti-flash rust additive, and the remaining defoamer are mixed to obtain component A;

[0016] The 3986 curing agent, propylene glycol methyl ether, and water were mixed to obtain component B.

[0017] Preferably, the grinding temperature is ≤50℃ and the pressure is ≤0.2MPa; the fineness of the grinding slurry is ≤20μm.

[0018] This invention provides the application of the ultra-long activation period two-component epoxy primer described in the above technical solution or the ultra-long activation period two-component epoxy primer prepared by the preparation method described in the above technical solution in transformer coating.

[0019] This invention provides a two-component epoxy primer with an ultra-long activation period, comprising a packaged component A and a component B; the mass ratio of component A to component B is 1.5–2.5:1; component B comprises 3986 curing agent, propylene glycol methyl ether, and water; component A comprises the following components in parts by mass: 35–55 parts of JT-WBE522 waterborne epoxy emulsion; 1–3 parts of dispersant; 0.3–0.5 parts of defoamer; 5–10 parts of titanium dioxide; 5–15 parts of mica powder; 10–15 parts of wollastonite; 5–10 parts of talc; 0.1–0.5 parts of carbon black; 0.2–0.5 parts of silane coupling agent; 0.5–1 part of anti-flash rust additive; 0.2–0.5 parts of thickener; 0.1–0.3 parts of wetting agent; 3–10 parts of cosolvent; and 10–20 parts of water. This invention utilizes JT-WBE522 waterborne epoxy emulsion and 3986 curing agent as the main components A and B, respectively. The combination of these two components, along with the combined effect of other components, ensures that the resulting two-component epoxy primer has an ultra-long activation period. Furthermore, the two-component epoxy primer of this invention also exhibits good salt spray resistance. The results of the examples show that the two-component epoxy primer provided by this invention has an activation period of up to 24 hours and salt spray resistance of up to 800 hours. Detailed Implementation

[0020] This invention provides a two-component epoxy primer with an ultra-long activation period, comprising a packaged component A and a component B; the mass ratio of component A to component B is 1.5 to 2.5:1;

[0021] Component B comprises 3986 curing agent, propylene glycol methyl ether, and water;

[0022] Component A comprises the following components in parts by weight: 35-55 parts of JT-WBE522 waterborne epoxy emulsion; 1-3 parts of dispersant; 0.3-0.5 parts of defoamer; 5-10 parts of titanium dioxide; 5-15 parts of mica powder; 10-15 parts of wollastonite; 5-10 parts of talc; 0.1-0.5 parts of carbon black; 0.2-0.5 parts of silane coupling agent; 0.5-1 part of anti-flash rust additive; 0.2-0.5 parts of thickener; 0.1-0.3 parts of wetting agent; 3-10 parts of cosolvent; and 10-20 parts of water.

[0023] Unless otherwise specified, all raw materials used in this invention are commercially available products well known to those skilled in the art.

[0024] The ultra-long activation period two-component epoxy primer of the present invention includes a packaged component A and a component B; the mass ratio of component A to component B is 1.5 to 2.5:1, preferably 1.8 to 2.2:1, and more preferably 2:1.

[0025] The B component of the present invention includes 3986 curing agent, propylene glycol methyl ether (PM) and water; the mass ratio of 3986 curing agent, propylene glycol methyl ether and water in the B component is preferably 20:4 to 6:18 to 22, more preferably 20:5:20.

[0026] Based on mass parts, component A of the present invention comprises 35 to 55 parts of JT-WBE522 aqueous epoxy emulsion, specifically 35 parts, 38 parts, 40 parts, 42 parts, 45 parts, 48 ​​parts, 50 parts, 53 parts, or 55 parts.

[0027] Based on the mass fraction of the JT-WBE522 aqueous epoxy emulsion, component A of this invention includes 1 to 3 parts of dispersant, preferably 1.5 to 2.5 parts, and more preferably 2 parts. The dispersant used in this invention is preferably BYK190 dispersant. The preferred use of the above-mentioned type of dispersant in this invention is beneficial for maintaining good dispersion of each component.

[0028] Based on the mass fraction of the JT-WBE522 aqueous epoxy emulsion, component A of this invention includes 0.3 to 0.5 parts of defoamer, preferably 0.3 to 0.4 parts. The defoamer used in this invention is preferably BYK-028 defoamer. This invention preferably uses the above-mentioned type of defoamer, which has a better defoaming effect.

[0029] Based on the mass fraction of the JT-WBE522 aqueous epoxy emulsion, component A of this invention comprises 5-10 parts of titanium dioxide, preferably 5-8 parts, and more preferably 5-6 parts. The titanium dioxide used in this invention is preferably R996 rutile titanium dioxide; the particle size of the titanium dioxide is preferably 0.1-0.45 μm. This invention preferably uses the above-mentioned type of titanium dioxide, which has a small particle size, facilitating dispersion and grinding.

[0030] Based on the mass fraction of the JT-WBE522 waterborne epoxy emulsion, component A of this invention comprises 5-15 parts of mica powder, preferably 8-12 parts, and more preferably 9-10 parts. The mica powder used in this invention is preferably GA-4 mica powder; the particle size of the mica powder is preferably 5-10 μm. This invention preferably uses the above-mentioned type of mica powder, as the smaller the particle size, the better the salt spray resistance, which is beneficial for improving the salt spray resistance of the coating.

[0031] Based on the mass fraction of the JT-WBE522 waterborne epoxy emulsion, component A of this invention comprises 10-15 parts of wollastonite, preferably 10-13 parts, and more preferably 10-11 parts. The particle size of the wollastonite in this invention is preferably 1250 mesh. This invention preferably uses the above-mentioned type of wollastonite, whose needle-like structure is beneficial for filling the gaps between paint films, achieving better salt spray resistance.

[0032] Based on the mass fraction of the JT-WBE522 waterborne epoxy emulsion, component A of this invention comprises 5-10 parts of talc, preferably 5-8 parts, and more preferably 5-6 parts. The particle size of the talc in this invention is preferably 1250 mesh. The preferred type of talc used in this invention is beneficial for shielding moisture and improving the salt spray resistance of the coating.

[0033] Based on the mass fraction of the JT-WBE522 aqueous epoxy emulsion, component A of this invention comprises 0.1 to 0.5 parts of carbon black, preferably 0.2 to 0.4 parts, and more preferably 0.3 parts. The carbon black used in this invention is preferably MA-100 carbon black; the particle size of the carbon black is preferably 10 to 100 μm. In this invention, carbon black is used as a coloring pigment, serving a color-adjusting function.

[0034] Based on the mass fraction of the JT-WBE522 waterborne epoxy emulsion, component A of this invention includes 0.2 to 0.5 parts, preferably 0.3 to 0.4 parts, of silane coupling agent. The silane coupling agent used in this invention is preferably MP-200 silane coupling agent. The preferred use of the above-mentioned type of silane coupling agent in this invention can improve the adhesion between the paint film and the substrate, and is beneficial to improving the water resistance and salt spray resistance of the coating.

[0035] Based on the mass fraction of the JT-WBE522 waterborne epoxy emulsion, component A of this invention includes 0.5 to 1 part of an anti-flash rust additive, preferably 0.5 to 0.8 parts, and more preferably 0.5 to 0.6 parts. The anti-flash rust additive of this invention is preferably Raybo 60 anti-flash rust additive.

[0036] Based on the mass fraction of the JT-WBE522 waterborne epoxy emulsion, component A of this invention includes 0.2 to 0.5 parts of thickener, preferably 0.2 to 0.3 parts. The thickener used in this invention is preferably 0620 thickener. The preferred use of the above-mentioned type of thickener in this invention is beneficial for increasing viscosity, preventing sedimentation, preventing sagging during application, and improving film thickness.

[0037] Based on the mass fraction of the JT-WBE522 waterborne epoxy emulsion, component A of this invention includes 0.1 to 0.3 parts, preferably 0.1 to 0.2 parts, of a wetting agent. The wetting agent used in this invention is preferably 4100 wetting agent. The preferred use of the above-mentioned type of wetting agent in this invention can reduce the surface tension of the paint film, which is beneficial in reducing the defects of pinholes in the paint film.

[0038] Based on the mass fraction of the JT-WBE522 aqueous epoxy emulsion, component A of this invention comprises 3-10 parts of a co-solvent, preferably 5-10 parts, and more preferably 8-10 parts. The co-solvent is preferably dipropylene glycol butyl ether (DPNB) and / or dipropylene glycol methyl ether (DPM), more preferably dipropylene glycol butyl ether and dipropylene glycol methyl ether, with a preferred mass ratio of 6:3.5-4.5, more preferably 6:4. The preferred use of the above-mentioned co-solvents in this invention enables better film formation and improves the salt spray resistance of the paint film.

[0039] Based on the mass fraction of the JT-WBE522 aqueous epoxy emulsion, component A of this invention comprises 10-20 parts of water, preferably 14-17 parts, and more preferably 15-16.5 parts. The water used in this invention is preferably deionized water.

[0040] In this invention, the fineness of component A is preferably ≤30μm, and the solid content is preferably ≥46wt%.

[0041] The ultra-long activation period two-component epoxy primer described in this invention is specifically a gray primer.

[0042] This invention provides a method for preparing the ultra-long activation period two-component epoxy primer described in the above technical solution, comprising the following steps:

[0043] Water, dispersant, mica powder, titanium dioxide, wollastonite, talc, carbon black, and a portion of defoamer are mixed and ground to obtain a grinding slurry; the grinding slurry, JT-WBE522 waterborne epoxy emulsion, cosolvent, thickener, wetting agent, silane coupling agent, anti-flash rust additive, and the remaining defoamer are mixed to obtain component A;

[0044] The 3986 curing agent, propylene glycol methyl ether, and water were mixed to obtain component B.

[0045] This invention involves mixing water, a dispersant, mica powder, titanium dioxide, wollastonite, talc, carbon black, and a portion of a defoamer, followed by grinding to obtain a grinding slurry. In this invention, the defoamer is preferably 30-35% of the total mass of the defoamer. Preferably, the dispersant, mica powder, titanium dioxide, wollastonite, talc, carbon black, a portion of water, and a portion of the defoamer are mixed, ground, and then rinsed with the remaining water. The ground and rinsed materials are then used as a grinding slurry for further processing. In this invention, the water is preferably 85-95% of the total mass of water, more preferably 88-91%. In this invention, the dispersant and a portion of the defoamer are added sequentially to a portion of the water at a stirring speed of 300-500 rpm (preferably 400 rpm). Then, the stirring speed is increased to 500-700 rpm (preferably 600 rpm), and mica powder, titanium dioxide, wollastonite, talc powder, and carbon black are added sequentially. After each reagent is added, the mixture is stirred for 3-5 minutes (preferably 4 minutes) before adding the next reagent. After the last reagent is added, the mixture is stirred for 15-25 minutes (preferably 20 minutes). The resulting slurry is then placed in a grinding mill for grinding. In this invention, the grinding temperature is preferably controlled to ≤50℃ and the grinding pressure to ≤0.2 MPa during the grinding process. Samples are taken every 20 minutes for testing. Grinding is stopped when the fineness is ≤20 μm. The resulting slurry is then pumped into a mixing tank and rinsed with the remaining water. The resulting rinsed slurry is then pumped into the mixing tank for further processing.

[0046] After obtaining the grinding slurry, the present invention mixes the grinding slurry, JT-WBE522 aqueous epoxy emulsion, cosolvent, thickener, wetting agent, silane coupling agent, anti-flash rust additive, and the remaining defoamer to obtain component A. Preferably, the present invention adds JT-WBE522 aqueous epoxy emulsion to the grinding slurry and stirs it at 400-500 rpm (preferably 450 rpm) for 5-15 minutes (preferably 10 minutes). Then, the remaining defoamer, all wetting agent, all cosolvent, all thickener, all silane coupling agent, and all anti-flash rust additive are added sequentially. After each reagent is added, the mixture is stirred for 3-5 minutes (preferably 4 minutes) before adding the next reagent. After the last reagent is added, the mixture is stirred for 10-20 minutes (preferably 15 minutes). The mixture is then filtered through a 100-mesh filter to obtain component A.

[0047] This invention involves mixing 3986 curing agent, propylene glycol methyl ether, and water to obtain component B. Preferably, under a stirring speed of 350–450 rpm (preferably 400 rpm), propylene glycol methyl ether and 3986 curing agent are added sequentially to the water. After each addition, the mixture is stirred for 3–5 minutes (preferably 4 minutes) before adding the next reagent. After the last reagent is added, the mixture is stirred for 15–25 minutes (preferably 20 minutes). The mixture is then filtered through a 100-mesh filter to obtain component B.

[0048] This invention provides the application of the ultra-long activation period two-component epoxy primer described in the above technical solution or the ultra-long activation period two-component epoxy primer prepared by the preparation method described in the above technical solution in transformer coating.

[0049] The technical solutions of this invention will be clearly and completely described below with reference to the embodiments thereof. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0050] The sources of the reagents used in the following examples are shown in Table 1:

[0051] Table 1. Sources of reagents used in the examples.

[0052] Types of reagents Indicator parameters source JTWBE522 epoxy emulsion / Jutu Technology (Dongguan) Co., Ltd. BYK190 dispersant / BYK Chemical Co., Ltd. BYK-028 Defoamer / BYK Chemical Co., Ltd. R996 Rutile Titanium Dioxide Particle size is 0.1–0.45 μm Beijing Yantai Northern Chemical Co., Ltd. GA-4 mica powder Particle size is 5–10 μm Anhui Green New Material Technology Co., Ltd. MA-100 Carbon Black Particle size 10–100 μm Mitsubishi Chemical Corporation talcum powder 1250 mesh Haicheng Pinyang Talc Mining Co., Ltd. Wollastonite 1250 mesh Lingshou County Shifeng Mining Processing Plant 4100 wetting agent / Guangzhou Digo Building Materials Co., Ltd. 0620 Thickener / Ditian Technology Development (Shanghai) Co., Ltd. MP-200 Silane Coupling Agent / Guangzhou Yinuo Chemical Technology Co., Ltd. Raybo60 anti-flash rust additive / Guangzhou Chenhui Trading Co., Ltd. 3986 curing agent / Dongguan Shuangling New Materials Co., Ltd.

[0053] Examples 1-5

[0054] The formulations of the two-component epoxy primers in Examples 1-5 are shown in Table 2, and the preparation methods are as follows:

[0055] At a stirring speed of 400 rpm, dispersant (2#) and defoamer (3#) were added sequentially to a portion of deionized water (1#). The stirring speed was increased to 600 rpm, and mica powder (4#), titanium dioxide (5#), wollastonite (6#), talc powder (7#), and carbon black (8#) were added sequentially. After each reagent was added, the mixture was stirred for 4 minutes before adding the next reagent. After the last reagent was added, the mixture was stirred for 20 minutes to obtain the pre-refined slurry.

[0056] The pre-refined slurry is placed in a grinding mill for grinding. The grinding temperature is controlled to be less than 50°C and the grinding pressure is less than 0.2MPa. Samples are taken every 20 minutes for testing. Grinding is stopped when the fineness is ≤20μm. The resulting slurry is pumped into a mixing tank and rinsed with residual deionized water (denoted as 9#). The resulting rinsed slurry is then pumped into the mixing tank.

[0057] Add JTWBE522 epoxy emulsion (denoted as 10#) to the mixing tank and stir for 10 minutes at 450 rpm. Then, add the remaining defoamer (denoted as 11#), all wetting agent (denoted as 12#), all cosolvent DPNB (denoted as 13#), all cosolvent DPM (denoted as 14#), all thickener (denoted as 15#), all silane coupling agent (denoted as 16#), and all anti-flash rust additive (denoted as 17#) in sequence. Stir for 4 minutes after each addition of a reagent before adding the next reagent. After the last reagent is added, stir for 15 minutes. Then filter through a 100-mesh filter to obtain component A (quality control items: appearance requirements: uniform surface color, no particles; solid content ≥46wt%; fineness ≤30μm).

[0058] Under a stirring speed of 400 rpm, propylene glycol methyl ether (PM) and deionized water were added sequentially in a mass ratio of 20:5:20. After each addition of a reagent, the mixture was stirred for 4 minutes before adding the next reagent. After the last reagent was added, the mixture was stirred for 20 minutes. The mixture was then filtered through a 100-mesh filter to obtain component B (quality control items: appearance requirements: uniform surface color, no particles; solid content ≥20wt%).

[0059] Table 2 shows the formulations of the two-component epoxy primers in Examples 1-5.

[0060]

[0061]

[0062] Comparative Examples 1-5

[0063] The formulations of the two-component epoxy primers in Comparative Examples 1 to 5 are shown in Table 3. The preparation methods are similar to those in Example 1, except that “JTWBE522 epoxy emulsion” in Example 1 is replaced with “LianGu Chemical 2092 epoxy emulsion”.

[0064] Table 3 shows the formulations of the two-component epoxy primers in Comparative Examples 1–5.

[0065]

[0066]

[0067] Test Example 1

[0068] The activation period and salt spray resistance of the two-component epoxy primers prepared in each embodiment and comparative example were tested. The activation period was determined based on the viscosity change and film performance changes of the two-component epoxy primer (specifically, the activation period was determined when the viscosity of the two-component epoxy primer doubled and the acid resistance, alkali resistance, adhesion, bending, impact, gloss, and salt spray resistance of the film decreased). Salt spray resistance was tested according to GB / T 1771-2007. The results are shown in Table 4. As can be seen from Table 4, the two-component epoxy primers in Examples 1-5 have a long activation period and their salt spray resistance meets the requirements. Considering cost-effectiveness, the two-component epoxy primer in Example 2 is the optimal formulation. Although the salt spray resistance of the two-component epoxy primers in each comparative example also basically meets the requirements, their activation periods are significantly shorter than those in the corresponding embodiments.

[0069] Table 4 Performance test data of the two-component epoxy primers in each embodiment and comparative example.

[0070] Sample source Activation period Salt spray resistance Example 1 24h 500h Example 2 24h 800h Example 3 24h 600h Example 4 24h 600h Example 5 24h 500h Comparative Example 1 12h 500h Comparative Example 2 12h 500h Comparative Example 3 13h 600h Comparative Example 4 12h 500h Comparative Example 5 12h 500h

[0071] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A two-component epoxy primer with an ultra-long activation period, characterized in that, It consists of two separately packaged components, A and B; the mass ratio of component A to component B is 1.5~2.5:

1. Component B consists of 3986 curing agent, propylene glycol methyl ether and water; Component A consists of the following components in parts by weight: 35-55 parts of JT-WBE522 waterborne epoxy emulsion; 1-3 parts of dispersant; 0.3-0.5 parts of defoamer; 5-6 parts of titanium dioxide; 5-15 parts of mica powder; 10-15 parts of wollastonite; 5-10 parts of talc; 0.1-0.5 parts of carbon black; 0.2-0.5 parts of silane coupling agent; 0.5-1 part of anti-flash rust additive; 0.2-0.5 parts of thickener; 0.1-0.3 parts of wetting agent; 3-10 parts of cosolvent; and 10-20 parts of water. In Component B, the mass ratio of 3986 curing agent, propylene glycol methyl ether, and water is 20:4-6:18-22.

2. The two-component epoxy primer with an ultra-long activation period according to claim 1, characterized in that, The dispersant is BYK190 dispersant, and the defoamer is BYK-028 defoamer.

3. The two-component epoxy primer with an ultra-long activation period according to claim 1, characterized in that, The titanium dioxide is R996 rutile titanium dioxide; the mica powder is GA-4 mica powder; and the carbon black is MA-100 carbon black.

4. The two-component epoxy primer with an ultra-long activation period according to claim 1, characterized in that, The silane coupling agent is MP-200 silane coupling agent; the flash rust inhibitor is Raybo 60 flash rust inhibitor.

5. The two-component epoxy primer with an ultra-long activation period according to claim 1, characterized in that, The thickener is 0620 thickener; the wetting agent is 4100 wetting agent; and the cosolvent is dipropylene glycol butyl ether and / or dipropylene glycol methyl ether.

6. The two-component epoxy primer with an ultra-long activation period according to claim 1, characterized in that, The fineness of component A is ≤30μm and the solid content is ≥46wt%; the solid content of component B is ≥20wt%.

7. The method for preparing the ultra-long activation period two-component epoxy primer according to any one of claims 1 to 6, characterized in that, Includes the following steps: Water, dispersant, mica powder, titanium dioxide, wollastonite, talc, carbon black, and a portion of defoamer are mixed and ground to obtain a grinding slurry; the grinding slurry, JT-WBE522 waterborne epoxy emulsion, cosolvent, thickener, wetting agent, silane coupling agent, anti-flash rust additive, and the remaining defoamer are mixed to obtain component A; The 3986 curing agent, propylene glycol methyl ether, and water were mixed to obtain component B.

8. The preparation method according to claim 7, characterized in that, The grinding temperature is ≤50℃ and the pressure is ≤0.2MPa; the fineness of the grinding slurry is ≤20μm.

9. The application of the ultra-long activation period two-component epoxy primer according to any one of claims 1 to 6 or the ultra-long activation period two-component epoxy primer prepared by the preparation method according to claim 7 or 8 in transformer coating.

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