Green environment-friendly epoxy insulating protective paint and preparation method thereof

Abstract

The invention belongs to the field of coatings, and particularly relates to green and environment-friendly epoxy insulating protective paint and a preparation method thereof. The protective paint comprises a component A and a component B, the component A comprises the following components in parts by mass: 40-60 parts of pretreated bisphenol A epoxy resin, 5-30 parts of a reactive diluent, 0.1-5 parts of a surface treating agent, 0.1-3 parts of a thixotropic agent, 0.1-2 parts of a thickening agent and 20-40 parts of filler, and the component B is an aromatic amine modified curing agent. The protective paint provided by the invention is a solvent-free system, and is low in VOC content, slight in smell, excellent in environmental protection property and reliable in comprehensive performance; meanwhile, the charging sequence is defined, the processing time during construction of the protective paint is shortened, the system stability is guaranteed, and the protective paint is suitable for iron core insulation protection, can replace traditional solvent type and water-based epoxy insulating paint and meets the requirements for industrial green manufacturing and high-performance protection.

Description

Technical Field

[0001] This invention belongs to the field of coatings, specifically relating to a green and environmentally friendly epoxy insulating protective paint and its preparation method. Background Technology

[0002] In the field of electrical equipment manufacturing, the iron core is a core component, and its insulation protection performance directly affects the operational stability and service life of the equipment. Epoxy insulating protective varnish is a key material for achieving iron core insulation protection. Currently, the mainstream iron core protective varnishes on the market mainly include solvent-based epoxy insulating varnish, water-based varnish, and polyester varnish. These products have formed a relatively mature application system in industrial applications, providing basic insulation and protection functions for the iron core.

[0003] However, existing products suffer from numerous technical and environmental challenges that urgently need to be addressed. From an environmental perspective, solvent-based epoxy insulating varnishes release large amounts of volatile organic compounds (VOCs) during curing, producing strong odors and posing health hazards to operators, while also failing to meet current green manufacturing development requirements. While water-based varnishes have lower VOC content, they have limitations in application performance and film quality. Regarding application and performance stability, existing products exhibit poor adaptability to environmental temperatures: at low temperatures, the viscosity of the mixture increases significantly, leading to difficult application and low construction efficiency; at high temperatures, insufficient film coverage and white gaps easily occur, affecting the insulation protection effect. Furthermore, some products suffer from poor leveling, easy sagging, and insufficient matching of hardness and flexibility in the cured film, making it difficult to balance ease of application with long-term protective reliability.

[0004] With the continuous improvement of environmental protection standards in the industrial sector and the increasing demands on the performance of insulation materials in equipment, the market demand for iron core protective coatings that combine green environmental protection characteristics with excellent comprehensive performance is becoming increasingly urgent. Developing an epoxy insulating protective coating that is solvent-free, low in odor, minimally harmful to human health, maintains suitable viscosity under different temperature conditions for smooth application, and also possesses good leveling properties, anti-sagging properties, and mechanical strength has become an important technical solution to overcome existing technological bottlenecks. Summary of the Invention

[0005] To address the aforementioned technical problems, the first aspect of this invention provides a green and environmentally friendly epoxy insulating protective paint, the raw materials of which include component A and component B; component A, by mass parts, includes: 40-60 parts of pretreated bisphenol A type epoxy resin, 5-30 parts of reactive diluent, 0.1-5 parts of surface treatment agent, 0.1-3 parts of thixotropic agent, 0.1-2 parts of thickener, and 20-40 parts of filler; component B includes a curing agent.

[0006] As an feasible example, the method for preparing the pretreated bisphenol A epoxy resin includes: distilling the bisphenol A epoxy resin at 80-100℃ and 50-300Pa to obtain the pretreated bisphenol A epoxy resin.

[0007] As an example of implementation, the bisphenol A type epoxy resin has an epoxy value of 0.5-0.6 mol / 100g and a viscosity of 10,000-20,000 cps at 25°C.

[0008] Furthermore, the bisphenol A type epoxy resin has an epoxy value of 0.51 mol / 100g, a viscosity of 10000-13000 cps at 25°C, and is designated NPEL-128E, and is available from Nan Ya Epoxy Resin Co., Ltd.

[0009] Untreated bisphenol A epoxy resins may contain unreacted monomers, low molecular weight oligomers, mechanical impurities, or byproducts remaining from the synthesis process. These impurities directly affect the resin's viscosity uniformity, curing activity, and final film quality. This invention utilizes secondary molecular distillation to effectively separate and remove these impurities, yielding a higher purity bisphenol A epoxy resin. This ensures more uniform dispersion when mixed with diluents, additives, and other components, reducing localized performance differences caused by impurities. Secondly, this invention aims to prepare a green and environmentally friendly solvent-free protective paint. Distillation pretreatment removes potentially volatile small molecules from the epoxy resin. Retaining these substances would release them during the coating curing process, compromising the solvent-free environmental properties and potentially causing defects such as pinholes and bubbles in the paint film. Furthermore, the viscosity of the purified bisphenol A epoxy resin is easier to control through formulation. Combined with reactive diluents and other components, it can maintain a suitable application viscosity at different ambient temperatures, avoiding abnormal viscosity fluctuations caused by impurities. This indirectly improves the coating's leveling properties, anti-sagging properties, and key properties such as the hardness and adhesion of the final film.

[0010] As an example of implementation, the reactive diluent has an epoxy value of 0.3-0.72 mol / 100g and a viscosity of 5-25 cps at 25°C.

[0011] Furthermore, the active diluent includes one or more of the following: dodecyl to tetradecyl glycidyl ether, o-tolyl glycidyl ether, or neopentyl glycol diglycidyl ether; wherein the dodecyl to tetradecyl glycidyl ether has an epoxy value of 0.3-0.33 mol / 100g and a viscosity of 6-12 cps at 25°C, and is designated LS-AGE; the o-tolyl glycidyl ether has an epoxy value of 0.55-0.60 mol / 100g and a viscosity of 5-10 cps at 25°C, and is designated LS-691; the neopentyl glycol diglycidyl ether has an epoxy value of 0.65-0.72 mol / 100g and a viscosity of 15-25 cps at 25°C, and is designated LS-678; the dodecyl to tetradecyl glycidyl ether, o-tolyl glycidyl ether, and neopentyl glycol diglycidyl ether can all be purchased from Green Home Materials Technology Co., Ltd.

[0012] As an implementable example, the surface treatment agent includes one or more of the following: KH550 surface treatment agent, BYK378 (polyether-modified dimethyl polysiloxane) surface treatment agent, BYK111 (a copolymer containing acidic groups) surface treatment agent, BYK A530 (defoaming polymer and polysiloxane solution) surface treatment agent, or BYK1799 (solvent / solvent-free high-efficiency silicone leveling agent); wherein KH550 surface treatment agent can be purchased from Jiangsu Huachang Chemical Co., Ltd., and BYK378, BYK111, BYK A530 or BYK1799 can all be purchased from BYK Chemical Company.

[0013] As an example of implementation, the thixotropic agent includes at least one of polyhydroxycarboxylic acid esters or urea-modified polyurethane.

[0014] Furthermore, the polyhydroxycarboxylic acid ester is designated PHEOBYK-R606 and is available from BYK Chemical Company.

[0015] Furthermore, the urea-modified polyurethane is designated BYK430 and is available from BYK Chemical Company.

[0016] As an example of implementation, the thickener includes at least one of a hydrophilic thickener or a hydrophobic thickener.

[0017] Furthermore, the hydrophilic thickener includes hydrophilic silica.

[0018] Furthermore, the hydrophobic thickener includes hydrophobic silica.

[0019] As an implementable example, the filler includes one or more of talc, heavy calcium carbonate, silica powder, or glass microspheres.

[0020] Furthermore, the particle size of the silicon micropowder is 1000-2000 mesh.

[0021] As an example of implementation, the curing agent is an aromatic amine modified curing agent with a viscosity of 100-250 cps at 25°C.

[0022] Furthermore, the aromatic amine modified curing agent is designated R2218B and is available from Guangdong Ruichi Technology Co., Ltd.

[0023] As an implementable example, the mass ratio of component A to component B is 100:(20-40).

[0024] In this invention, the environmentally friendly epoxy insulating protective paint is prepared by mixing component A and component B in a specific mass ratio (adjusting the ratio appropriately according to changes in ambient temperature). When mixing, minimize the introduction of air, ensuring thorough mixing at the bottom and edges of the container to prevent localized uncured areas. After mixing, allow it to stand for 5-10 minutes before brushing it onto the iron core. This environmentally friendly epoxy insulating protective paint is highly sensitive to ambient temperature; higher temperatures shorten its pot life. If the viscosity of the mixture suddenly increases significantly, it indicates gelation, and it should not be used further. Continued use will reduce coating adhesion and cause peeling. When using this paint, prepare only the amount needed, mixing and using immediately to avoid unnecessary waste (as the application time is short and the paint in the container cures quickly, it should be used within 20-30 minutes).

[0025] A second aspect of this invention provides a method for preparing a green and environmentally friendly epoxy insulating protective varnish, comprising the following steps: Pretreated bisphenol A epoxy resin, reactive diluent, surface treatment agent and filler are mixed and dispersed at high speed at 2000-3000 r / min for 2-4 h. Then thickener and thixotropic agent are added and dispersed at high speed for 30-45 min to obtain component A. Component A and component B curing agent are mixed to obtain green and environmentally friendly epoxy insulating protective paint.

[0026] In this invention, the reactive diluent and surface treatment agent must be mixed with the epoxy resin first. This is primarily because the pretreated epoxy resin has a high viscosity. Adding the reactive diluent first reduces the initial viscosity of the system, creating conditions for the surface treatment agent to fully bond with the epoxy resin matrix. It also provides a suitable fluid environment for the subsequent dispersion of fillers, preventing the silica powder from agglomerating due to a sudden increase in system viscosity. Adding the thickener prematurely would cause the system viscosity to rise too early, hindering the uniform diffusion of fillers such as silica powder, potentially leading to problems such as localized incomplete curing and film delamination. Adding the thickener and thixotropic agent later allows for precise control of the final viscosity and thixotropy of the system after the basic components are uniformly dispersed, ensuring effective dispersion.

[0027] Beneficial effects (i) This invention is a solvent-free system. Volatile impurities are removed by distillation pretreatment of bisphenol A epoxy resin, and no solvent components are added. Compared with solvent-based epoxy insulating paints on the market, the odor generated during the curing process is milder, the content of volatile organic compounds is low, and the harm to the human body is small, meeting the requirements for green and environmentally friendly use.

[0028] (II) Through reasonable formula design and optimized feeding sequence, the viscosity of the mixture can be kept at a suitable level under different ambient temperatures. There is no problem of brushing difficulty caused by excessive viscosity in low temperature environment, and it can also avoid insufficient film coverage and white exposure in high temperature environment. Moreover, the brushing is smooth during the applicable period. With the "prepare and use immediately" method, construction loss and operation difficulties can be reduced.

[0029] (III) The coating prepared by the present invention has excellent leveling and anti-sagging properties. After application, it can quickly wet and spread and maintain stable film formation. The surface of the paint film is smooth, without pits or white spots, and has high gloss. The gloss at a 60° angle can exceed 90. At the same time, the cured paint film has high hardness, with a Shore hardness of up to 90, excellent impact resistance, good flexibility, and reliable comprehensive mechanical properties.

[0030] (iv) This invention clearly defines the order of raw material addition: first, epoxy resin is mixed with reactive diluent, surface treatment agent and filler, and then thickener and thixotropic agent are added. Combined with high-speed dispersion process, it can ensure that each component is fully dispersed, avoid problems such as layering and bubbles, significantly shorten processing time, and ensure the performance stability of single components and mixtures, and reduce quality defects such as local non-curing.

[0031] (v) The paint film provided by the present invention has strong adhesion to the iron core substrate, is not easy to peel or crack, and has good chemical stability and insulation performance. It can effectively protect the iron core from the influence of the external environment, while meeting the basic performance requirements of electrical equipment for insulation materials. It can replace traditional solvent-based, water-based and other competing products and is suitable for higher standard industrial application scenarios. Attached Figure Description

[0032] Figure 1 This is a construction diagram of the product corresponding to Example 6.1.

[0033] Figure 2 This is a schematic diagram showing the white showing phenomenon after the product is installed, corresponding to Example 6.1.

[0034] Figure 3 This is a schematic diagram of the product corresponding to Example 6.3. Detailed Implementation

[0035] In this application, the pretreated bisphenol A epoxy resin is prepared by double distillation at 100°C and 130 Pa to obtain the pretreated bisphenol A epoxy resin. The bisphenol A epoxy resin has an epoxy value of 0.51 mol / 100g, a viscosity of 10000-13000 cps at 25°C, and is designated NPEL-128E, purchased from Nan Ya Epoxy Resin Co., Ltd.

[0036] The performance test items of the green and environmentally friendly epoxy insulating protective paint in this invention are shown in Table 1.

[0037] 1. Viscosity test: Use a rotational viscometer to test the viscosity at 25°C. Test each sample three times and take the average value.

[0038] 2. Gel time test: The gel time at 25℃ was measured using a gel time meter. Each sample was tested three times, and the average value was taken.

[0039] 3. Construction process performance testing 3.1 Spline Preparation 1) The exterior of the zinc-coated steel sheet is ground and polished to remove dust, oil, and rust. 2) Apply the A / B mixture (3:1 by weight) to the zinc-coated steel sheet using a 5mm wide brush, and allow the mixture to cure. Observation of surface drying time and actual drying time 3.2 Sagging performance test: Referring to GB9264, a sagging tester was used to prepare a sample of painted steel plate. After curing, the paint did not cover the stripes.

[0040] 3.3 Leveling performance test: Refer to GB1750 and use a leveling instrument. During the curing process, the paint spreads to the periphery and covers the stripes in the middle.

[0041] 3.4 Hardness test: Refer to GB6739. After the cured material has been cured for one week, take 3 points to test the hardness and take the average value.

[0042] 3.5 Gloss test: Refer to GB9754, use a gloss meter, take 3 points for testing and take the average value.

[0043] 3.6 Flexibility test: Refer to GB1731 and use a flexibility tester to test the grade on both sides of the paint.

[0044] 3.7 Impact resistance test: Refer to GB1732, use an impact tester and the vertical drop ball method to test the force that the paint film can withstand on the front and back of the zinc steel plate, which causes the paint film to peel off. This is the maximum force that the paint film can withstand.

[0045] Table 1

[0046] Experimental Group 1: Epoxy Resin Screening Experiment This experiment includes Examples 1.1 to 1.4, where the dosage information of component A is detailed in Table 2, and the mass ratio of component A to component B R2218B curing agent is 3:1.

[0047] The performance test results of the green and environmentally friendly epoxy insulating protective paint in Examples 1.1-1.4 are shown in Table 2.

[0048] The preparation method is as follows: pretreated bisphenol A type epoxy resin or bisphenol A type epoxy resin, reactive diluent, surface treatment agent and filler are mixed and dispersed at high speed at 2000 r / min for 4 h. Then thickener and thixotropic agent are added and dispersed at high speed for 30 min to obtain component A. Component A and component B curing agent are mixed to obtain green and environmentally friendly epoxy insulating protective paint.

[0049] Table 2

[0050] The experimental results in Table 2 show that using (untreated) bisphenol A epoxy resin as a raw material component is not conducive to improving the hardness of the green and environmentally friendly epoxy insulating protective paint.

[0051] Experiment 2: Selection of the mass fraction of reactive diluent This experiment includes Examples 2.1 to 2.3, where the dosage information of component A is detailed in Table 3, and the mass ratio of component A to component B R2218B curing agent is 3:1.

[0052] The performance test results of the green and environmentally friendly epoxy insulating protective paint in Examples 2.1-2.3 are shown in Table 3.

[0053] The preparation method is as follows: pretreated bisphenol A type epoxy resin, reactive diluent, surface treatment agent and filler are mixed and dispersed at high speed at 2000 r / min for 4 h. Then thickener and thixotropic agent are added and dispersed at high speed for 30 min to obtain component A. Component A and component B curing agent are mixed to obtain green and environmentally friendly epoxy insulating protective paint.

[0054] Table 3

[0055] Comparing the experimental data in Tables 2 and 3, it can be seen that selecting a combination of LS-AGE and LS-678 reactive diluents can improve the surface drying time and actual drying time of the product. The overall dosage of reactive diluents can be adjusted according to actual needs.

[0056] Experiment Group 3: Screening Experiment for Surface Treatment Agent Dosage This experiment includes Examples 3.1 to 3.5, where the dosage information of component A is detailed in Table 4, and the mass ratio of component A to component B R2218B curing agent is 3:1.

[0057] The performance test results of the green and environmentally friendly epoxy insulating protective paints in Examples 3.1 to 3.5 are shown in Table 4.

[0058] The preparation method is as follows: pretreated bisphenol A type epoxy resin, reactive diluent, surface treatment agent and filler are mixed and dispersed at high speed at 2000 r / min for 4 h. Then thickener and thixotropic agent are added and dispersed at high speed for 30 min to obtain component A. Component A and component B curing agent are mixed to obtain green and environmentally friendly epoxy insulating protective paint.

[0059] Table 4

[0060] As can be seen from the experimental results in Table 4, the choice of surface treatment agent has a significant impact on the anti-sagging performance of the product. When the mass ratio of KH550 surface treatment agent, BYK378 surface treatment agent, BYK111 surface treatment agent, and BYK1799 surface treatment agent is 0:0.3:0.3:1.5, the anti-sagging performance of the product is optimal.

[0061] Experiment Group 4: Selection of Packing Material Mass Parts This experiment includes Examples 4.1 to 4.3, where the dosage information of component A is detailed in Table 5, and the mass ratio of component A to component B R2218B curing agent is 3:1.

[0062] The performance test results of the green and environmentally friendly epoxy insulating protective paint in Examples 4.1-4.3 are shown in Table 5.

[0063] The preparation method is as follows: pretreated bisphenol A type epoxy resin, reactive diluent, surface treatment agent and filler are mixed and dispersed at high speed at 2000 r / min for 4 h. Then thickener and thixotropic agent are added and dispersed at high speed for 30 min to obtain component A. Component A and component B curing agent are mixed to obtain green and environmentally friendly epoxy insulating protective paint.

[0064] Table 5

[0065] Comparing the experimental data in Table 5, it can be seen that the selection of filler mass fraction has a significant impact on the viscosity of the product. In actual production, the amount of raw materials used can be reasonably adjusted according to the viscosity changes of the system.

[0066] Experimental Group 5: Screening Experiment for Auxiliary Agent Dosage This experiment includes Examples 5.1 to 5.4, where the dosage information of component A is detailed in Table 2, and the mass ratio of component A to component B R2218B curing agent is 3:1.

[0067] The performance test results of the green and environmentally friendly epoxy insulating protective paint in Examples 5.1-5.4 are shown in Table 6.

[0068] The preparation method is as follows: pretreated bisphenol A type epoxy resin or bisphenol A type epoxy resin, reactive diluent, surface treatment agent and filler are mixed and dispersed at high speed at 2000 r / min for 4 h. Then thickener and thixotropic agent are added and dispersed at high speed for 30 min to obtain component A. Component A and component B curing agent are mixed to obtain green and environmentally friendly epoxy insulating protective paint.

[0069] Table 6

[0070] The experimental results in Table 6 show that the amount of thixotropic agent and thickener has a significant impact on the viscosity and anti-sagging properties of the product. In actual production, the amount of additives can be adjusted reasonably according to process requirements.

[0071] Experiment Group 6: Screening Experiment for High and Low Temperature Dosage The raw material for component A was tested according to Example 5.1. The effect of the mass ratio of component A and component B at different temperatures on viscosity was tested. The experimental results are detailed in Table 7.

[0072] Table 7

[0073] Example 6.1 Product construction diagram as shown Figure 1 As shown.

[0074] Example 6.1 Schematic diagram of the white showing phenomenon after product construction. Figure 2 As shown.

[0075] Example 6.3 Product diagram is as follows Figure 3 As shown.

[0076] Experiment Group 7: Screening Experiment of Dispersion Process Parameters To investigate the impact of dispersion parameters of component A raw material on product performance during the preparation process.

[0077] The raw materials and preparation method for component A are the same as in Example 5.1, except that: Example 7.1: Pretreated bisphenol A type epoxy resin, reactive diluent, surface treatment agent and filler were mixed and dispersed at high speed at 2000 r / min for 2 h.

[0078] Example 7.2: Pretreated bisphenol A epoxy resin, reactive diluent, surface treatment agent and filler were mixed and dispersed at high speed at 2000 r / min for 3 h.

[0079] Example 7.3: Pretreated bisphenol A epoxy resin, reactive diluent, surface treatment agent and filler were mixed and dispersed at high speed at 2000 r / min for 4 h.

[0080] Example 7.4: Pretreated bisphenol A type epoxy resin, reactive diluent, surface treatment agent and filler were mixed and dispersed at high speed at 800 r / min for 3 h.

[0081] Example 7.5: Pretreated bisphenol A epoxy resin, reactive diluent, surface treatment agent and filler were mixed and dispersed at high speed at 1000 r / min for 3 h.

[0082] Example 7.6: Pretreated bisphenol A epoxy resin, reactive diluent, surface treatment agent and filler were mixed and dispersed at high speed at 1500 r / min for 3 h.

[0083] By testing the processing time and bubble conditions in Examples 7.1 to 7.6, it can be concluded that 1500 r / min and 3 h are the optimal dispersion process parameters for the preparation of component A.

[0084] Experimental Group 8: Screening Experiment of Reactive Diluents This experiment screens the effect of different components of reactive diluents on product viscosity.

[0085] The raw materials and preparation method for component A are the same as in Example 5.1, except that: Example 8.1: The mass ratio of reactive diluent to pretreated bisphenol A epoxy resin was 1:20; 1:10; 15:85, and the reactive diluent was LS-AGE (C12-tetradecyl glycidyl ether).

[0086] Example 8.2: The mass ratio of reactive diluent to pretreated bisphenol A epoxy resin was 1:19; 1:9; 15:85, and the reactive diluent was LS-691 (o-tolyl glycidyl ether).

[0087] Example 8.3: The mass ratio of reactive diluent to pretreated bisphenol A epoxy resin was 1:19; 1:9; 15:85, and the reactive diluent was LS-678 (neopentyl glycol diglycidyl ether).

[0088] The viscosity of the product systems in Examples 8.1 to 8.3 was tested, and the experimental results are shown in Table 8. The surface drying time at different temperatures is shown in Table 9.

[0089] Table 8 (Unit: cps)

[0090] Table 9 (Unit: min)

[0091] As can be seen from the experimental results in Table 8, choosing the reactive diluent LS-691 is beneficial to reducing the viscosity of the coating and improving the construction speed. As can be seen from Table 9, choosing the reactive diluent LS-691 is beneficial to reducing the surface drying time of the coating.

[0092] Screening of adjuvant types in experimental group 9 This experimental group mainly explores the impact of the selection of thickeners and surface treatment agents on coating performance.

[0093] The raw material systems in Examples 9.1 to 9.6 are the same as those in Example 5.1, except that: In Example 9.1, the surface treatment agent was BYK1799.

[0094] In Example 9.2, the surface treatment agent was BYK A530.

[0095] In Example 9.3, the surface treatment agent was KH550.

[0096] In Example 9.4, the surface treatment agent was BYK111.

[0097] In Example 9.5, the surface treatment agent was BYK1799.

[0098] In Example 9.6, the thickener is hydrophilic silica.

[0099] The defoaming time of test examples 9.1 to 9.5 is detailed in Table 10.

[0100] Table 10

[0101] Compared with Examples 9.6 and 5.1 (i.e., using hydrophobic silica), hydrophobic silica has a lower effect on viscosity, therefore KH550 and hydrophobic silica are the optimal additive choices.

[0102] In summary, the raw material systems of Examples 3.4 and 5.3 are the optimal formulation system selections.

[0103] The raw material information involved in the above experiments is detailed in Table 11.

[0104] Table 11

Claims

1. A green and environmentally friendly epoxy insulating protective coating, characterized in that, The raw materials for preparation include component A and component B; The A component, by weight, comprises: 40-60 parts of pretreated bisphenol A type epoxy resin, 5-30 parts of reactive diluent, 0.1-5 parts of surface treatment agent, 0.1-3 parts of thixotropic agent, 0.1-2 parts of thickener, and 20-40 parts of filler. Component B includes a curing agent.

2. The green and environmentally friendly epoxy insulating protective paint according to claim 1, characterized in that, The method for preparing the pretreated bisphenol A epoxy resin includes: distilling untreated bisphenol A epoxy resin at 80-100℃ and 50-300Pa to obtain the pretreated bisphenol A epoxy resin.

3. The green and environmentally friendly epoxy insulating protective paint according to claim 2, characterized in that, The untreated bisphenol A type epoxy resin has an epoxy value of 0.5-0.6 mol / 100g and a viscosity of 10000-20000 cps at 25°C.

4. The green and environmentally friendly epoxy insulating protective paint according to claim 1, characterized in that, The reactive diluent has an epoxy value of 0.3-0.72 mol / 100g and a viscosity of 5-25 cps at 25°C.

5. The green and environmentally friendly epoxy insulating protective paint according to claim 4, characterized in that, The active diluent includes one or more of C12-14-tetradecyl glycidyl ether, o-tolyl glycidyl ether, or neopentyl glycol diglycidyl ether.

6. The green and environmentally friendly epoxy insulating protective paint according to claim 1, characterized in that, The surface treatment agent includes one or more of KH550 surface treatment agent, BYK378 surface treatment agent, BYK111 surface treatment agent, BYK A530 surface treatment agent or BYK1799 surface treatment agent.

7. The green and environmentally friendly epoxy insulating protective paint according to claim 1, characterized in that, The thixotropic agent includes at least one of polyhydroxycarboxylic acid esters or urea-modified polyurethane.

8. The green and environmentally friendly epoxy insulating protective varnish according to any one of claims 1-7, characterized in that, The thickener includes at least one of hydrophilic or hydrophobic thickeners.

9. The green and environmentally friendly epoxy insulating protective varnish according to claim 8, characterized in that, The hydrophobic thickener includes hydrophobic silica.

10. A method for preparing a green and environmentally friendly epoxy insulating protective varnish according to any one of claims 1-9, characterized in that, Includes the following steps: Pretreated bisphenol A epoxy resin, reactive diluent, surface treatment agent and filler are mixed and dispersed at high speed at 2000-3000 r / min for 2-4 hours. Thickener and thixotropic agent are then added and dispersed at high speed for 30-45 minutes to obtain component A. Component A and component B are mixed to obtain green and environmentally friendly epoxy insulating protective paint.

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