Shielding tool made of self-curing material and preparation method of shielding tool

Abstract

The invention discloses a shielding tool of a self-curing material and a preparation method thereof, and relates to the technical field of high-voltage insulating materials. The invention aims to solve the problems of tedious shielding steps, high technical requirements and poor high-temperature tolerance and insulation performance in the existing hot-line work. According to the technical scheme, the self-curing material shielding tool with excellent heat resistance and electrical insulation performance is obtained by mixing cordierite filler, epoxy resin and other materials, grinding, stirring, performing vacuum mixing, adding a catalyst and a cocatalyst and then performing molding curing. According to the shielding tool, the shielding steps are simplified, the technical requirements are reduced, the high-temperature tolerance and the insulating property are also remarkably improved, and the safety and the efficiency of hot-line work are ensured; the method is suitable for shielding operation of various complex and large operation objects or multi-circuit lines on the same tower, and has wide application prospects.

Description

Technical Field

[0001] The present invention relates to the technical field of high-voltage insulating materials, and particularly to a shielding tool made of a self-curing material and a preparation method thereof. Background Art

[0002] In the technical field of high-voltage insulating materials, the heat resistance and electrical insulation performance of shielding tools are key indicators for measuring their quality. At present, most of the shielding tools widely used in the market adopt traditional insulating materials such as rubber and plastic. Although these materials can meet the basic insulation requirements to a certain extent, their performance often drops significantly under harsh environments such as high temperature and high humidity, resulting in easy aging and deformation of the shielding tools, thus seriously affecting the safe operation of electrical equipment.

[0003] For example, CN203553729U discloses a wire insulation shielding cover, which is mainly made of a rigid plastic material. Although this shielding material has good insulation performance at room temperature, its heat resistance is insufficient in a high-temperature environment, which easily causes the material to soften and deform, thus affecting the shielding effect. In addition, this material may also show an aging phenomenon during long-term use, further reducing its insulation performance.

[0004] Another example is TWM502949U, which discloses an improved structure of an outdoor fuse link switch insulation shielding cover. This shielding cover is made of a rubber material; although the rubber material has certain elasticity and sealing performance, its insulation performance and aging resistance will be affected in high-temperature and high-humidity environments, resulting in a decrease in the insulation effect of the shielding cover and even possibly causing safety accidents.

[0005] In summary, the shielding tools in the prior art have obvious deficiencies in heat resistance and electrical insulation performance, especially in harsh environments such as high temperature and high humidity, where their performance drops significantly. Therefore, developing a shielding tool made of a self-curing material with excellent heat resistance and electrical insulation performance is of great significance for improving the safety and reliability of electrical equipment. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a shielding tool made of a self-curing material and a preparation method thereof, to solve the problems of insufficient heat resistance and electrical insulation performance of shielding tools in the technical field of high-voltage insulating materials, and at the same time overcome the limitations of existing shielding tools that are prone to aging and deformation in harsh environments such as high temperature and high humidity, resulting in a decrease in insulation performance.

[0007] To solve the above technical problems, the technical solution adopted by the present invention is as follows: A shielding tool for self-curing materials, comprising a mixed colloid of epoxy resin E51, silane coupling agent, cordierite powder, aluminum hydroxide, and silicon nitride, wherein the mass percentage of cordierite powder is 20% - 30%, the mass percentage of aluminum hydroxide is 15%, and the mass percentage of silicon nitride is 10% - 20%; the mixed colloid is loaded into a mold of an insulating shielding cover for molding and curing to form a shielding tool for self-curing materials with excellent heat resistance and electrical insulation properties.

[0008] In a preferred embodiment, the mass percentage of the epoxy resin E51 is 30% - 50%.

[0009] In a preferred embodiment, the mass percentage of the silane coupling agent is 5%.

[0010] In a preferred embodiment, a catalyst and a co-catalyst are added to the mixed colloid before molding and curing.

[0011] In a preferred embodiment, the catalyst is an amine catalyst, and the co-catalyst is an organic acid or an organic acid salt.

[0012] In a preferred embodiment, the mold of the insulating shielding cover has a shape and size matching the operation object.

[0013] A preparation method for a shielding tool for self-curing materials, comprising the following steps: Step1: Grind epoxy resin E51, silane coupling agent, cordierite powder, aluminum hydroxide, and silicon nitride to obtain a mixed powder; Step2: Stir the mixed powder in Step1 to obtain a mixed colloid; Step3: Load the mixed colloid in Step2 into a mold of an insulating shielding cover; Step4: Add a catalyst and a co-catalyst and perform vacuum mixing; Step5: Perform molding and curing to obtain a shielding tool for self-curing materials with excellent heat resistance and electrical insulation properties.

[0014] In a preferred embodiment, in the grinding step of Step1, each component is ground to a particle size less than 100 μm.

[0015] In a preferred embodiment, in the stirring step of Step2, the stirring speed is 500 - 1500 rpm, and the stirring time is 10 - 30 minutes.

[0016] In a preferred embodiment, in the molding and curing step of Step5, the curing temperature is 80 - 150 °C, and the curing time is 2 - 4 hours.

[0017] A shielding tool for self-curing materials provided by the present invention and its preparation method have the following beneficial effects: 1. The present invention innovatively introduces cordierite powder as a filler into epoxy materials. This measure has brought significant performance improvements. The addition of cordierite significantly increases the density of the material, making it more solid and durable. At the same time, the thermal conductivity is also significantly improved, which means that the material can transfer heat more effectively when heated, reducing the risk of heat accumulation. 2. The introduction of cordierite in the present invention also enhances the dielectric breakdown strength and arc resistance of the material. The dielectric breakdown strength is a measure of the maximum electric field strength that the material can withstand without being damaged under the action of an electric field. Its improvement means that the material has a stronger ability to withstand the electric field. The arc resistance reflects the durability of the material under the action of arc discharge, and its enhancement helps the material to operate stably in harsh environments. 3. The present invention introduces cordierite powder as a filler into epoxy materials. This improvement not only enhances the mechanical properties of the material, such as tensile strength and tear strength, but also significantly improves its heat resistance and electrical insulation properties, providing the possibility for preparing high-performance shielding tools. 4. Through fine grinding, mixing, catalysis, and curing processes, the present invention ensures the uniform distribution of cordierite filler in epoxy materials. The grinding process grinds the cordierite powder into fine powder, which helps its full dispersion in epoxy materials. 5. In the mixing process of the present invention, high-speed mechanical stirring is used to fully mix the cordierite filler and epoxy materials to form a uniform mixture. In the catalysis process, by adding catalysts and co-catalysts, the chemical reaction between epoxy resin and cordierite filler is promoted to form a stable copolymer. 6. The curing process of the present invention is carried out in a vacuum furnace. Through continuous mixing and curing, the homogeneity and stability of the material are further improved. The fine preparation process ensures the full play of the material's performance, providing a strong guarantee for preparing high-performance shielding tools. 7. The self-curing material shielding tool of the present invention solves the problem that traditional shielding tools are prone to aging and deformation at high temperatures, resulting in a decrease in insulation performance, by introducing cordierite filler and optimizing the preparation process, and significantly improves the heat resistance of the material. 8. The introduction of cordierite in the present invention enhances the thermal stability of the material, enabling it to maintain a stable structure at high temperatures. At the same time, the optimized preparation process reduces the internal defects and stresses of the material, improving its anti-aging ability. 9. The shielding tool prepared by using the materials and methods of the present invention can maintain stable insulation performance at high temperatures, avoiding potential safety hazards caused by material aging and deformation. 10. The self-curing material shielding tool of the present invention solves the problem of insufficient electrical insulation performance of traditional shielding tools in complex and harsh environments (such as high humidity, high pressure, etc.) by optimizing the material composition and preparation process, and significantly improves the electrical insulation performance of the material; 11. The introduction of cordierite in the present invention enhances the dielectric properties and arc resistance of the material, enabling it to maintain stable electrical insulation performance in harsh environments such as high humidity and high pressure. At the same time, the optimized preparation process reduces defects such as pores and cracks inside the material, improves the reliability of its electrical insulation performance, enables the shielding tool to maintain stable electrical insulation performance in various harsh environments, and ensures the safe operation of power equipment; 12. The self-curing material shielding tool of the present invention meets the increasing demand for high-performance shielding tools in the field of high-voltage insulation materials due to the rapid development of the power industry by introducing cordierite filler and optimizing the preparation process; 13. The shielding tool of the present invention has excellent heat resistance and electrical insulation performance, can maintain stable performance in harsh environments such as high temperature, high humidity, and high pressure. At the same time, its preparation process is simple and the cost is low, with broad application prospects. It not only meets the demand for high-performance shielding tools in the field of high-voltage insulation materials, but also provides strong technical support for the development of the power industry; 14. The shielding tool of the present invention can reduce potential safety hazards caused by material aging, deformation, or insufficient electrical insulation performance during use. Its excellent heat resistance and electrical insulation performance ensure the stable operation of power equipment in harsh environments; 15. The preparation process of the shielding tool of the present invention is simple and the cost is low, which is easy to mass-produce and apply. Its broad application prospects and significant social benefits inject new vitality into the development of the power industry; 16. The shielding tool of the present invention can also be customized according to actual needs to meet the usage requirements in different scenarios. Its flexibility and scalability provide more choices for the maintenance and management of power equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below with reference to the drawings and embodiments: Figure 1 It is a schematic structural diagram of the shielding tool of the present invention; Figure 2 It is a working view of the wire shielding cover of the present invention; Figure 3 It is a working view of the connecting pipe of the wire shielding cover of the present invention; Figure 4 It is a process flow chart for preparing epoxy / cordierite copolymer in the examples of the present invention; Figure 5 It is the thermal conductivity and thermal diffusivity of the epoxy / cordierite copolymer in the examples of the present invention; Figure 6 SEM images of the epoxy / cordierite copolymer before and after curing in the examples of the present invention; In the figure: wire shielding cover connecting pipe 1, wire shielding cover 2. Detailed implementation manners

[0019] The technical solutions in the present invention will be further described below with reference to the accompanying drawings and embodiments: Example 1 As Figure 4 shown, a self-curing material shielding tool of the present invention is composed of epoxy resin E51, silane coupling agent, cordierite powder, aluminum hydroxide, silicon nitride and catalyst in specific proportions. Among them, the mass percentage of cordierite powder is 20% - 30%, the mass percentage of aluminum hydroxide is 15%, the mass percentage of silicon nitride is 10% - 20%, the mass percentage of epoxy resin E51 is 30% - 50%, and the mass percentage of silane coupling agent is 5%; Epoxy resin E51 is used as the matrix material to provide good adhesion and curing performance; The silane coupling agent is used to enhance the interfacial bonding force between the inorganic filler and the epoxy resin; Cordierite powder, aluminum hydroxide and silicon nitride are used as inorganic fillers to significantly improve the heat resistance and electrical insulation performance of the material.

[0020] During the preparation process, first, the raw materials are ground to ensure that the particle size is less than 100 μm to improve the mixing uniformity and the performance of the cured material. Subsequently, the mixed powder is placed in a mixer and stirred at a stirring speed of 500 - 1500 r / min for 10 - 30 min to obtain a uniformly mixed colloid. Then, the colloid is loaded into an insulating shielding cover mold with a shape and size matching the working object, and a catalyst is added for vacuum mixing to remove the bubbles and volatiles in the colloid. Finally, the mold loaded with the mixed colloid is placed in an oven for molding and curing, the curing temperature is 80 - 150 °C, and the curing time is 2 - 4 h to obtain a self-curing material shielding tool with excellent heat resistance and electrical insulation performance, as Figures 1 to 3 shown, including wire shielding cover connecting pipe 1, wire shielding cover 2.

[0021] Example 2 In another preferred embodiment, on the basis of the above Example 1, as Figures 4 to 6As shown, this embodiment provides a shielding appliance for self-curing materials and its preparation method. First, prepare the following raw materials: epoxy resin E51, silane coupling agent, cordierite powder, aluminum hydroxide, silicon nitride, amine catalyst, and organic acid salt co-catalyst. Specifically, the mass percentage of epoxy resin E51 is 35%, the mass percentage of silane coupling agent is 5%, the mass percentage of cordierite powder is 25%, the mass percentage of aluminum hydroxide is 15%, the mass percentage of silicon nitride is 15%, and the remaining mass percentage is reserved for adjustment to ensure the plasticity and processability of the mixture.

[0022] Next, grind the above raw materials to ensure that the particle size of each component is less than 100 μm, thereby improving the mixing uniformity and the properties of the cured material. After grinding, place the mixed powder in a mixer and stir at a speed of 1000 r / min for 20 min to obtain a uniformly mixed colloid.

[0023] Subsequently, load the mixed colloid into an insulating shielding cover mold with a shape and size matching the object of operation. During the loading process, pay attention to controlling the amount and distribution of the colloid to ensure the integrity and thickness uniformity of the cured shielding appliance. Then, add the amine catalyst and organic acid salt co-catalyst and perform vacuum mixing to remove the bubbles and volatiles in the colloid, further improving the density and properties of the material.

[0024] Finally, place the mold loaded with the mixed colloid in an oven for molding and curing. The curing temperature is 100 °C and the curing time is 3 h. After curing is completed, take out the mold, cool it, and demold it to obtain a shielding appliance for self-curing materials with excellent heat resistance and electrical insulation properties.

[0025] Example 3 In another preferred embodiment, based on the above Example 1, this embodiment is basically the same as Example 1, except for the raw material ratio and curing conditions. Specifically, the mass percentage of epoxy resin E51 is 50%, the mass percentage of silane coupling agent is 5%, the mass percentage of cordierite powder is 20%, the mass percentage of aluminum hydroxide is 15%, the mass percentage of silicon nitride is 10%, and the rest of the preparation method, steps, and parameters are the same as those in Example 1.

[0026] Example 4 In another preferred embodiment, based on the above-mentioned Embodiment 1, this embodiment is basically the same as Embodiment 1, except for the raw material ratio and curing conditions. Specifically, the mass percentage of epoxy resin E51 is 30%, the mass percentage of silane coupling agent is 5%, the mass percentage of cordierite powder is 30%, the mass percentage of aluminum hydroxide is 15%, the mass percentage of silicon nitride is 20%, and the remaining preparation methods, steps and parameters are the same as those in Embodiment 1.

[0027] Embodiment 5 In another preferred embodiment, based on the above-mentioned Embodiment 1, first weigh the solids according to the following parts by weight: weigh the filler cordierite powder, and manually grind cordierite (white crystal) for 15 min until it becomes white powder. Weigh epoxy resin E51, silane coupling agent ( ), cordierite powder, aluminum hydroxide, and silicon nitride according to the mass percentages of 40%, 5%, 25%, 15%, and 15%, and then continuously mechanically stir the mixture at a speed of 1000 r / min. Weigh the epoxy / cordierite composite with a molar ratio of 50 mol%, and add 3 phr (parts per hundred parts of resin) of catalyst copper acetylacetonate and 1 phr of co-catalyst nonylphenol to the epoxy / cordierite composite. Continuously mix the mixture in a vacuum furnace at room temperature for 120 min. In the furnace, the pre-mixed mixture is cured to obtain a mixture colloid. Then load the slurry into an insulating shielding cover mold, place the mold in a high-temperature curing machine, and set the curing process as the curing temperature of 150 °C, the curing time of 2 h, and the heating rate of the temperature of 100 °C / min. After cooling, obtain Figure 1 the insulating shielding cover as shown.

[0028] Taking the group without adding cordierite filler as the reference group, the preparation process of the reference group is the same as that of the epoxy / cordierite composite experimental group. Mix E51 epoxy resin with silane coupling curing agent, aluminum hydroxide, and silicon nitride according to the mass fractions of 53%, 7%, 20%, and 20%. The curing temperature is 150 °C, and the curing time is 3 hours. After cooling, obtain the insulating shielding cover of the reference group.

[0029] Use two groups of insulating shielding cover specimens for breakdown tests. Select the thinner part for the test. The reduction of the specimen thickness means an increase in the breakdown probability, which is beneficial to reducing the test error.

[0030] Figure 5It depicts the influence of fillers on the thermal conductivity when heating from 20 °C to 120 °C. The thermal conductivity of the two groups gradually increases with the increase of temperature until it reaches 0.48 W / (m·K); at 100 °C, the thermal conductivity decreases, although this value is lower than that of the unfilled epoxy resin group; in addition, from 20 °C to 120 °C, the thermal diffusivity of the two groups decreases with the increase of temperature, and the thermal diffusivity of the experimental group decreases more slowly than that of the reference group, which also reflects that the composition and structure of the material are more uniform without local heterogeneity or defects. Adding cordierite fillers improves the thermal conductivity of traditional epoxy resins, indicating the ability of the material to transport specific heat per unit area per unit time. Therefore, the higher the thermal conductivity, the greater the heat transfer rate per unit material. The copolymer insulation material expands when the temperature rises. High thermal conductivity fillers are dispersed inside the polymer at a low filler concentration and are separated from each other. The contribution of the fillers to the overall thermal conductivity is small, and the thermal conductivity of the composite material is mainly determined by the polymer matrix itself. With the increase of the filler concentration, heat conduction paths are generated by creating a high thermal conductivity filler network, which greatly improves the overall thermal conductivity of the composite material.

[0031] Figure 6 (a) and (c) are SEM images of epoxy / cordierite copolymer before curing, Figure 6 (b) and (d) are SEM images of epoxy / cordierite copolymer after curing. Figure 6 (c) It can be seen that more cracks appear on the resin matrix because the addition of filler particles makes the combination of the resin matrix and filler particles more effective. When the resin matrix is stressed, the structure formed by the particles and the resin matrix enables the resin matrix to break only after a large amount of deformation, that is, ductile fracture. Figure 6 (a), in contrast, Figure 6 (d) shows that the resin matrix after curing is more continuous, locally smoother, with fewer cracks, but there is Figure 6 the brittle fracture shown in (b).

[0032] Example 6 In another preferred embodiment, based on the above Example 5, this example is basically the same as Example 5, except for the raw material ratio and curing conditions. Specifically, the mass percentage of epoxy resin E51 is 50%, the mass percentage of silane coupling agent is 5%, the mass percentage of cordierite powder is 15%, the mass percentage of aluminum hydroxide is 15%, the mass percentage of silicon nitride is 15%, and the remaining mass percentage is reserved for adjustment space to ensure the plasticity and processability of the mixture. The remaining preparation methods, steps and parameters of this example are the same as those of Example 5.

[0033] In this embodiment, the performance of the self-curing material is further optimized by adjusting the raw material ratio, enabling it to enhance the strength and toughness of the material while ensuring heat resistance and electrical insulation performance. Meanwhile, under the same curing conditions, the material can still maintain good curing effects and performance stability.

[0034] Example 7 This embodiment provides a self-curing material shielding tool for different application scenarios. Different from Embodiments 1 to 6, the shielding tool in this embodiment is designed for the complex structure of high-voltage transmission lines. Therefore, the mold of the insulating shielding cover has a shape and size matching the complex structure of the high-voltage transmission line. The remaining preparation methods, steps, and parameters are similar to those in Embodiment 1, but can be appropriately adjusted according to specific application scenarios and requirements.

[0035] In this embodiment, by customizing the mold of the insulating shielding cover, the self-curing material shielding tool can closely fit the complex structure of the high-voltage transmission line, thereby providing better shielding effects and safety. Meanwhile, the excellent performance of the self-curing material also ensures the stability and reliability of the shielding tool in harsh environments such as high temperature and high humidity.

[0036] In a preferred solution, the mass percentage of the epoxy resin E51 is 30% - 50%; the above setting can effectively control costs and improve the cost performance of the product while ensuring the material performance. Meanwhile, the content of epoxy resin E51 within this range can also ensure that the cured material has good mechanical strength and chemical corrosion resistance.

[0037] In a preferred solution, the mass percentage of the silane coupling agent is 5%; the above setting can not only ensure that the silane coupling agent fully exerts its bridging effect and enhances the bonding force between materials, but also prevent cost increase or performance decline due to excessive addition, thus achieving the best cost performance.

[0038] In a preferred solution, a catalyst and a cocatalyst are added to the mixed colloid before molding and curing; the above setting can significantly improve the curing speed and curing effect of the mixed colloid, making the molding process more efficient and stable. Meanwhile, the addition amounts of the catalyst and the cocatalyst need to be precisely calculated to ensure that the performance and quality of the final product meet the expected requirements.

[0039] In a preferred solution, the catalyst is an amine catalyst, and the cocatalyst is an organic acid or organic acid salt; the above setting is such that the amine catalyst can effectively reduce the reaction activation energy and accelerate the reaction process, while the organic acid or organic acid salt as the cocatalyst can further enhance the catalytic efficiency, ensure the smooth progress of the reaction, reduce the generation of by-products, and improve the product purity.

[0040] In a preferred embodiment, the mold of the insulating shielding cover has a shape and size that match the object of operation; with the above settings, the insulating shielding cover can closely adhere to the object of operation, effectively preventing current leakage or short - circuit phenomena, improving the safety and reliability of the operation. At the same time, it is also convenient for installation and disassembly, enhancing the work efficiency.

[0041] In a preferred embodiment, in the grinding step of Step1, each component is ground to a particle size less than 100 μm; with the above settings, it can ensure that each component is fully and evenly mixed, improving the reaction efficiency. At the same time, the smaller particle size also helps with dissolution and dispersion in subsequent steps, thereby further enhancing the quality and performance of the product.

[0042] In a preferred embodiment, in the stirring step of Step2, the stirring speed is 500 - 1500 rpm and the stirring time is 10 - 30 minutes; with the above settings, it can ensure that the materials are fully and evenly mixed in the reaction kettle, improving the reaction efficiency and product quality. At the same time, the range of this stirring speed and time has been optimized, which can reduce energy consumption and wear while ensuring the effect.

[0043] In a preferred embodiment, in the molding and curing step of Step5, the curing temperature is 80 - 150 °C and the curing time is 2 - 4 hours; with the above settings, it can ensure that the material is fully cured in the mold, achieving ideal physical properties and shape stability. At the same time, this temperature range and time setting also help reduce the internal stress of the material, improving the overall quality of the product.

[0044] In summary, the present invention proposes an innovative self - curing material shielding tool and its preparation method. This technological achievement has milestone significance in the field of high - voltage insulating material technology. It successfully solves the long - existing problem of insufficient heat resistance and electrical insulation performance of shielding tools in this field, effectively overcoming the limitations of the prior art that shielding tools are prone to aging and deformation in harsh environments such as high temperature and high humidity, resulting in a decline in insulation performance.

[0045] Compared with the closest prior art, the self - curing material shielding tool of the present invention exhibits significant technical differences and innovation points. Specifically, the present invention introduces high - performance inorganic fillers such as cordierite powder, aluminum hydroxide, and silicon nitride. These fillers, with their excellent heat resistance and electrical insulation performance, significantly enhance the overall performance of the shielding tool. The addition of these inorganic fillers not only enhances the thermal stability of the material but also improves its ability to resist electrical breakdown, thus solving the problem of insufficient heat resistance and electrical insulation performance at the source.

[0046] Furthermore, through careful raw material proportioning and scientific preparation processes, the present invention ensures that the self-curing material has excellent processing performance and curing effect. This innovation enables the masking tool to maintain material uniformity and stability during the preparation process, thereby improving the product yield and quality. At the same time, the reasonable preparation process also enables the masking tool to quickly cure during use, forming a solid protective layer, further enhancing its masking effect and safety.

[0047] In addition, the present invention also realizes the tight fitting of the masking tool with various complex structures by customizing the mold of the insulating masking cover. This design not only improves the applicability and flexibility of the masking tool, but also ensures its effective application on electrical equipment such as high-voltage transmission lines. The tightly fitting masking tool can more effectively prevent electrical breakdown and short-circuit accidents, thereby further enhancing the safety and reliability of electrical equipment.

[0048] The remarkable effect of the present invention is that by introducing high-performance inorganic fillers and reasonable raw material proportioning and preparation processes, the heat resistance and electrical insulation performance of the self-curing material masking tool have been significantly improved. Experimental data show that in harsh environments such as high temperature and high humidity, the masking tool can still maintain stable insulation performance and is not prone to aging and deformation. This characteristic makes the present invention have broad application prospects in the maintenance and safety guarantee of electrical equipment such as high-voltage transmission lines.

[0049] It is worth mentioning that the masking tool also exhibits good corrosion resistance. In various corrosive environments, it can maintain the integrity of the structure and the stability of the function, thereby further expanding its application range. Especially in the maintenance of electrical equipment in specific environments such as coastal areas and chemical industries, the masking tool of the present invention has irreplaceable important value. This innovation not only enhances the safety and reliability of electrical equipment, but also provides strong technical support for the sustainable development of related industries.

Claims

1. A masking tool for self-curing material, characterized in that: The invention comprises a mixed colloid of epoxy resin E51, silane coupling agent, cordierite powder, aluminum hydroxide and silicon nitride, wherein the mass percentage of cordierite powder is 20% to 30%, the mass percentage of aluminum hydroxide is 15% and the mass percentage of silicon nitride is 10% to 20%. The mixed colloid is loaded into a mold of an insulating shielding cover for molding and curing to form a self-curing material shielding device with excellent heat resistance and electrical insulation properties.

2. A masking tool for self-curing materials according to claim 1, characterized in that: The mass percentage of the epoxy resin E51 is 30% to 50%.

3. A masking tool for self-curing material according to claim 1, characterized in that: The mass percentage of the silane coupling agent is 5%.

4. A masking tool for self-curing material according to claim 1, characterized in that: The catalyst and the co-catalyst are added to the mixed colloid before molding and curing.

5. A masking tool for self-curing material according to claim 4, characterized in that: The catalyst is an amine catalyst, and the co-catalyst is an organic acid or an organic acid salt.

6. A masking tool for self-curing material according to claim 1, characterized in that: The mold of the insulation shielding cover has a shape and size that matches the working object.

7. A method for preparing a masking tool of a self-curing material according to any one of claims 1 to 6, characterized in that: The following steps are involved: Step 1: Grind epoxy resin E51, silane coupling agent, cordierite powder, aluminum hydroxide and silicon nitride to obtain mixed powder; Step 2: Stir the mixed powder in Step 1 to obtain a mixed colloid; Step 3: Load the mixed colloid in Step 2 into the mold of the insulating shield; Step 4: Add catalyst and co-catalyst and mix in vacuum; Step 5: Molding and curing to obtain a self-curing material masking tool with excellent heat resistance and electrical insulation properties.

8. The method for preparing a masking tool of a self-curing material according to claim 7, characterized in that: The grinding step in Step 1 is to grind each component to a particle size less than 100 μm.

9. The method for preparing a masking tool of a self-curing material according to claim 7, characterized in that: The stirring step in Step 2 has a stirring speed of 500-1500 rpm and a stirring time of 10-30 minutes.

10. The method for preparing a masking tool of a self-curing material according to claim 7, characterized in that: The molding and curing step in Step 5 has a curing temperature of 80-150° C. and a curing time of 2-4 hours.

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