Electric-corrosion-resistant hydrophobic insulating composite material for hot-line work soft sling and preparation method and application of electric-corrosion-resistant hydrophobic insulating composite material

Abstract

The invention relates to the technical field of insulating composite materials, in particular to an electric corrosion resistant hydrophobic insulating composite material for a hot-line work soft sling and a preparation method and application of the electric corrosion resistant hydrophobic insulating composite material. The first purpose of the invention is to provide a preparation method of an anti-electric-corrosion hydrophobic insulating composite material for a hot-line work soft sling, and the preparation method comprises the following steps: dipping an insulating base material in a composite anti-electric-corrosion coating, carrying out vacuum drying for 12-24 hours, and carrying out hot-pressing curing; and after cooling, spraying fluorinated liquid on the surface, and curing to obtain the electric corrosion resistant hydrophobic insulating composite material. According to the electric-corrosion-resistant hydrophobic insulating composite material provided by the invention, through the electric field response characteristic of the modified ZIF-8 nanoparticles, the micro-nano coarse structure of hydrophobic SiO2 and the self-repairing function of the double-effect microcapsules (fluorine-containing silicone oil / epoxy resin core material), the insulation and pressure resistance, hydrophobic durability and electric corrosion damage self-repairing capability of the insulating material are synergistically improved.

Description

Technical Field

[0001] This invention relates to the field of insulating composite materials technology, and in particular to an anti-electro-erosion hydrophobic insulating composite material for flexible slings used in live-line work, its preparation method, and its application. Background Technology

[0002] In high-voltage or harsh environments such as power transmission and high-altitude operations, traditional insulated traction slings often face electrolytic corrosion (ECC) damage and performance degradation due to humid environments. ECC originates from oxidative decomposition caused by partial discharge on the material surface under a high-voltage electric field, leading to cracks, embrittlement, and even breakage of the sling's fiber insulation material (such as aramid, polyester, and nylon), directly threatening operational safety. Humid environments further accelerate electrochemical corrosion, reducing the sling's insulation resistance and increasing the risk of leakage. Existing solutions often mitigate ECC by coating the surface with traditional insulating layers such as epoxy resin or silicone rubber. However, these materials lack sufficient hydrophobicity (contact angle <90°), making them prone to moisture absorption and dielectric strength degradation under long-term rain or salt spray corrosion. Furthermore, they lack self-healing capabilities, making it difficult to meet the long-term reliability requirements under complex operating conditions.

[0003] Superhydrophobic surface technology (contact angle >150°) significantly reduces the contact area between liquids and insulating materials by constructing micro-nano-level rough structures combined with low surface energy materials, thereby reducing the electrochemical corrosion rate and improving insulation performance. However, traditional superhydrophobic coatings (such as fluoropolymers or wax layers) are easily damaged by local overheating or arc erosion under high-voltage electric fields, and have poor mechanical wear resistance, making them unsuitable for applications involving frequent bending and friction in traction slings. Furthermore, existing anti-electro-erosion coatings mostly rely on single-function fillers (such as alumina and mica powder), which can only delay the electro-erosion process through physical barriers and cannot repair existing microcracks, resulting in a gradual decline in electro-erosion life after long-term use. Summary of the Invention

[0004] The purpose of this invention is to address the aforementioned shortcomings of the prior art by proposing an anti-electro-erosion hydrophobic insulating composite material for flexible slings used in live-line work, its preparation method, and its application.

[0005] The first objective of this invention is to provide a method for preparing an anti-electro-erosion hydrophobic insulating composite material for flexible slings used in live-line work, comprising the following steps: impregnating an insulating substrate in a composite anti-electro-erosion coating, vacuum drying for 12-24 hours, and hot-pressing for curing; after cooling, spraying a fluorinated liquid onto the surface and then curing to obtain the anti-electro-erosion hydrophobic insulating composite material; The composite anti-electro-erosion coating comprises the following raw materials in parts by weight: 10-15 parts of silane-modified ZIF-8 nanoparticles, 5-10 parts of hydrophobic SiO2 nanoparticles, 8-13 parts of dual-effect microcapsules, 80-100 parts of fluorocarbon resin, 12-16 parts of solvent, and 0.5 parts of dispersant. The wall material of the dual-effect microcapsule is urea-formaldehyde resin, and the core material is fluorinated silicone oil and epoxy resin.

[0006] Furthermore, the concentration of the fluorinated liquid PFPE is 1 wt%, and it is cured at 120℃ for 30 min; the solvent is butyl acetate.

[0007] Furthermore, the mass ratio of fluorinated silicone oil to epoxy resin is 1:1.

[0008] Furthermore, the preparation method of the dual-effect microcapsules includes the following steps: S1, urea, formaldehyde, and deionized water are dissolved and mixed. The pH is adjusted to 8.5-9 with ammonia. The mixture is heated to 70℃ and kept at that temperature for 1-1.5 hours to form a transparent and viscous linear urea-formaldehyde prepolymer solution. The solution is then cooled to room temperature and diluted with deionized water. S2. Mix fluorinated silicone oil with epoxy resin, heat and stir until uniform and transparent, add sodium dodecylbenzene sulfonate and deionized water, and emulsify to form a core material emulsion. S3. Slowly add the urea-formaldehyde prepolymer solution dropwise to the core material emulsion while stirring. Adjust the pH of the system to 3.0 with 0.1 mol / L citric acid solution to initiate the urea-formaldehyde resin condensation reaction. Heat to 55℃ and keep warm for 3 h, stirring continuously to allow the urea-formaldehyde resin to crosslink and form a film on the surface of the core material. After the reaction is complete, cool to room temperature, centrifuge, wash, dry, and sieve to obtain dual-effect microcapsules.

[0009] Furthermore, in step S2, n-hexane is added to the core material emulsion as a dispersion medium.

[0010] Furthermore, the particle size of the dual-effect microcapsules is 10-20 μm.

[0011] Furthermore, the preparation method of silane-modified ZIF-8 nanoparticles is as follows: γ-aminopropyltriethoxysilane is dissolved in anhydrous ethanol, and glacial acetic acid is added dropwise to adjust the pH to 4-5 to promote hydrolysis. The mixture is then sonicated to form a modified solution. ZIF-8 nanoparticles are then added to the ethanol and modified solution and refluxed. After cooling, the mixture is centrifuged, washed, and dried.

[0012] Furthermore, the insulating substrate is modified aramid fiber, and the preparation method of the insulating substrate is as follows: 1) Aramid fiber is selected as the insulating substrate, and plasma treatment is used to introduce hydroxyl or carboxyl groups; 2) Lubricating coating treatment: Prepare a mixture of silicone oil and white oil (volume ratio 1:1), add 0.5~1 wt% of octadecyl dimethyl benzyl ammonium chloride as an antistatic agent, pass the plasma-treated aramid fiber through the suspension at a speed of 10 m / min, control the coating thickness to 1-2 μm, and dry at 60℃ for 30 minutes. 3) Insulation substrate preparation: 8-12 twisted aramid fibers treated with lubricant coating are combined into strands; the three strands are woven together at a 120° angle, with a twist pitch of 6-8 times the rope diameter, to obtain the insulation substrate.

[0013] A second objective of this invention is to provide an anti-electro-erosion hydrophobic insulating composite material for flexible slings used in live-line work, prepared by the method described above.

[0014] A third objective of this invention is to provide an anti-electro-erosion hydrophobic insulating composite material for weaving flexible slings for live-line work, as described above.

[0015] This invention proposes a hydrophobic insulating composite material resistant to electro-erosion. By modifying the electric field response characteristics of ZIF-8 nanoparticles, utilizing the micro-nano rough structure of hydrophobic SiO2, and incorporating the self-healing function of dual-effect microcapsules (containing fluorinated silicone oil / epoxy resin core), it synergistically enhances the insulating material's withstand voltage, hydrophobic durability, and self-healing ability against electro-erosion damage. Simultaneously, by combining an impregnation coating-thermosetting lamination process, it addresses the problem of weak interfacial adhesion between traditional coatings and the insulating substrate, ensuring the long-term stability of the coating under dynamic loads.

[0016] Synergistic enhancement of superhydrophobicity and insulation performance: The micro-nano rough structure constructed by hydrophobic SiO2 nanoparticles, combined with low surface energy fluorocarbon resin, enables a contact angle >155°, achieving self-cleaning and moisture-proof functions; at the same time, the high resistance characteristics of aramid substrate and fluorocarbon resin enable the power frequency breakdown voltage to reach 680 kV / m, far exceeding that of traditional insulation materials.

[0017] Significantly enhanced resistance to electrolytic corrosion: Modified ZIF-8 nanoparticles migrate to high electric field regions under the action of an electric field, inhibiting electrolytic corrosion by adsorbing corrosive media or releasing corrosion inhibitors; Dual-effect microcapsules can repair cracks and extend service life (electrolytic corrosion mass loss is only 0.3 mg, reaching the "excellent" standard).

[0018] Self-healing and durability optimization: Microcapsules rupture to release fluorinated silicone oil and epoxy resin, automatically filling cracks and restoring insulation properties. Combined with cold isostatic pressing-thermal curing process, it eliminates porosity and improves the adhesion between the coating and the substrate, making it suitable for dynamic load environments. Attached Figure Description

[0019] Figure 1 A process flow diagram for the preparation of an anti-electro-erosion hydrophobic insulating composite material for flexible slings used in live-line work; Figure 2 SEM image of the anti-electro-erosion coating surface; Figure 3 SEM image of the anti-electro-erosion hydrophobic insulating composite material. Detailed Implementation

[0020] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0021] Example 1 A method for preparing an anti-electro-erosion hydrophobic insulating composite material for flexible slings used in live-line work, such as... Figure 1 As shown, the specific steps include the following: 1. Pretreatment and weaving of insulating substrate 1) Aramid fiber is selected as the insulating substrate, and plasma treatment is used to introduce active groups into the aramid.

[0022] Plasma treatment uses an oxygen / argon mixed gas (ratio 1:1), a power of 80-120 W, and a treatment time of 3-5 minutes to introduce active groups such as hydroxyl (-OH) or carboxyl (-COOH).

[0023] 2) Lubricating coating treatment: Prepare a mixture of silicone oil and white oil (volume ratio 1:1), add 0.5~1 wt% of octadecyl dimethyl benzyl ammonium chloride as an antistatic agent, pass the plasma-treated aramid fiber through the suspension at a speed of 10 m / min, control the coating thickness to 1-2 μm, and dry at 60℃ for 30 minutes.

[0024] 3) Insulation substrate preparation: Using a high-speed twisting machine (twist range 50-200 T / m), 8-12 lubricated and coated aramid fibers are twisted and combined into strands (such as a 12×1 structure). Then, a three-strand braiding process is used, with the three strands crossed at a 120° angle and the twist pitch being 6-8 times the rope diameter, to obtain the insulation substrate.

[0025] 2. Composite anti-electro-erosion coating 1) Preparation of modified ZIF-8 nanoparticles: Weigh 1.487 g Zn(NO3)2·6H2O and dissolve it in 50 mL of anhydrous methanol. Sonicate for 5 minutes until completely dissolved to form a transparent solution A.

[0026] Weigh 0.656 g of 2-methylimidazole and dissolve it in 50 mL of anhydrous methanol. Stir magnetically for 10 minutes until uniformly dispersed to form solution B.

[0027] Dissolve 0.02 g of KH-550 (γ-aminopropyltriethoxysilane) in 10 mL of anhydrous ethanol, add 0.1 mL of glacial acetic acid (to adjust the pH to 4-5 to promote hydrolysis), and sonicate for 15 minutes until complete hydrolysis to form solution C.

[0028] Under vigorous stirring (500 rpm), solution B was added dropwise to solution A at a rate of 1 mL / min. After the addition was completed, stirring was continued for 24 h. After the reaction was completed, the suspension was centrifuged at 8000 rpm for 15 minutes, the supernatant was discarded, and the precipitate was washed three times with anhydrous methanol to remove unreacted ligands and impurities, thus obtaining ZIF-8.

[0029] The ZIF-8 precipitate collected by centrifugation was transferred to a 250 mL three-necked flask, and 100 mL of anhydrous ethanol and pre-prepared solution C were added. The mixture was sonicated for 30 minutes to ensure uniform dispersion of the particles. A reflux condenser was installed, and the mixture was heated in an oil bath to 78 °C (the boiling point of ethanol) and maintained under reflux for 6 hours. During this period, the mixture was continuously magnetically stirred (400 rpm) to ensure sufficient reaction between the silane coupling agent and the ZIF-8 surface. After the reaction was completed, the mixture was allowed to cool naturally to room temperature, and the product was collected by centrifugation at 10,000 rpm for 20 minutes. The product was washed three times with an ethanol / water mixture (volume ratio 1:1) and finally dried in a vacuum drying oven at 60 °C for 12 hours to obtain white powdery modified ZIF-8 nanoparticles.

[0030] 2) Preparation of hydrophobic SiO2 nanoparticles: 5 g of SiO2 nanoparticles (15 nm in diameter) were weighed and placed in a 250 mL three-necked flask. 100 mL of anhydrous toluene was added as a dispersion medium, and the mixture was sonicated for 30 minutes (200 W) to ensure uniform dispersion of the particles. Subsequently, under nitrogen protection, 2.5 g of hexamethyldisilazane (HMDS) (mass ratio of 1:2 to SiO2) was added dropwise. After the addition was complete, the temperature was raised to 110 °C and refluxed for 6 hours. During this period, magnetic stirring at 400 rpm was used to promote the silanization reaction of HMDS with the hydroxyl groups (-OH) on the surface of SiO2. After the reaction was completed, the mixture was naturally cooled to room temperature. The product was collected by vacuum filtration and washed three times each with anhydrous ethanol and n-hexane (50 mL each time) to remove unreacted HMDS and byproducts. Finally, the sample was dried in a vacuum drying oven at 80 °C for 12 hours to obtain hydrophobic SiO2 nanoparticles.

[0031] 3) Preparation of dual-effect microcapsules: Weigh 6.0 g of urea and 11.0 mL of formaldehyde solution (containing 4.07 g of formaldehyde, with a urea to formaldehyde molar ratio of 1:1.5) into a three-necked flask, and dissolve in 50 mL of deionized water. Adjust the pH to 8.5 with ammonia, heat to 70℃ and maintain the temperature for 1.5 h to form a transparent, viscous linear urea-formaldehyde prepolymer solution. Cool to room temperature and dilute to 100 mL with deionized water for later use.

[0032] Fluorinated silicone oil (25 g) and epoxy resin (25 g) were mixed and heated at 60°C with stirring until homogeneous and transparent. 1.0 g sodium dodecylbenzenesulfonate and 50 mL deionized water were added, and the mixture was emulsified at 2500 rpm for 10 min using a high-speed disperser to form a stable emulsion.

[0033] Add 50 mL of n-hexane as a dispersion medium and continue stirring for 5 min to prevent droplet aggregation.

[0034] The urea-formaldehyde prepolymer solution was slowly added dropwise to the core material emulsion (dropping time 30 min) while magnetically stirring at 400 rpm. The pH of the system was adjusted to 3.0 with 0.1 mol / L citric acid solution to initiate the urea-formaldehyde resin condensation reaction. The temperature was raised to 55℃ and held for 3 h, with continuous stirring during this period to allow the urea-formaldehyde resin to crosslink and form a film on the core material surface. After the reaction was completed, the mixture was cooled to room temperature, centrifuged (8000 rpm, 15 min) to collect the product, and washed three times with deionized water to remove unreacted monomers, yielding dual-effect microcapsules.

[0035] The microcapsules were dried in a vacuum drying oven at 60℃ for 12 h to remove residual moisture and solvent. Microcapsules with a particle size of 10-20 μm were then screened through a 200-mesh sieve (75 μm pore size).

[0036] 4) Composite anti-electro-erosion coating formulation: Weigh 86.5 parts of FEVE fluorocarbon resin (hydroxyl value 60 mg KOH / g) and 13.5 parts of butyl acetate (boiling point 126℃) as solvents according to the mass ratio, and add 0.5 parts (based on resin mass) of BYK-110 dispersant. Stir mechanically at 500 rpm for 2 h at 60℃ to form a uniform matrix solution. Then, add 15 parts of modified ZIF-8 nanoparticles, 5 parts of hydrophobic SiO2 nanoparticles and 8 parts of dual-effect microcapsules in sequence. After each filler is added, sonicate for 15 min (power 200 W) and continue stirring for 30 min to ensure uniform dispersion, and obtain a composite anti-electro-erosion coating with a solid content of 55±2%.

[0037] 3. Anti-electro-erosion hydrophobic insulating composite material The insulating substrate prepared in step 1 is placed in the composite anti-electro-erosion coating prepared in step 2, and ultrasonicated for 15-30 min, then allowed to stand for 12-24 h to ensure that the anti-electro-erosion coating is uniformly adsorbed on the surface of the insulating substrate. Vacuum dry at 60-80℃ for 12-24 h.

[0038] Then, thermosetting was performed, with heating in two stages. Stage 1 was 80℃ for 2 hours to allow the resin to pre-flow; Stage 2 was 180℃ for 4 hours to complete the cross-linking reaction, while the microcapsule wall material cured simultaneously. After cooling, a fluorinated liquid (PFPE, 1 wt%) was sprayed onto the surface, and cured at 120℃ for 30 minutes to obtain the desired electro-erosion resistant hydrophobic insulating composite material.

[0039] Example 2 In the composite anti-electro-erosion coating, 10 wt% modified ZIF-8 nanoparticles, 10 wt% hydrophobic SiO2 nanoparticles and 8 wt% dual-effect microcapsules were added.

[0040] Example 3 The anti-electro-erosion coating formulation includes 15 wt% modified ZIF-8 nanoparticles, 5 wt% hydrophobic SiO2 nanoparticles, and 13 wt% dual-effect microcapsules.

[0041] Comparative Example 1 The anti-electro-erosion coating formulation does not contain modified ZIF-8 nanoparticles, but only 5 wt% hydrophobic SiO2 nanoparticles and 8 wt% dual-effect microcapsules.

[0042] Comparative Example 2 The anti-electro-erosion coating formulation does not contain hydrophobic SiO2 nanoparticles, but only 15 wt% modified ZIF-8 nanoparticles and 8 wt% dual-effect microcapsules.

[0043] Comparative Example 3 In the anti-electro-erosion coating formulation, 8 wt% dual-effect microcapsules are added, along with only 15 wt% modified ZIF-8 nanoparticles and 5 wt% hydrophobic SiO2 nanoparticles.

[0044] The hydrophobic SiO2 nanoparticles of this invention construct a lotus leaf-like micro-nano rough structure on the coating surface, and combined with low surface energy fluorocarbon resin, the contact angle is >155°, achieving self-cleaning and moisture-proof functions.

[0045] Under the influence of an electric field, ZIF-8 particles migrate to the high electric field region and inhibit electrolytic corrosion by adsorbing corrosive media or releasing corrosion inhibitors (such as hydrolysis products of silane coupling agents).

[0046] When cracks appear in the coating, the microcapsules rupture to release fluorinated silicone oil and epoxy resin, which fill the cracks and restore insulation properties, extending service life.

[0047] The high resistance characteristics of aramid substrate and fluorocarbon resin, combined with the dense structure of the coating, enable the power frequency breakdown voltage to reach 680kV / m (Example 1), which far exceeds that of traditional insulating materials.

[0048] Hydrophobicity testing method: Using a contact angle meter and the seated drop method, 5 μL of deionized water is dropped onto the sample surface. The contact angle (θ) between the water droplet and the surface is calculated using image analysis software. Five points are tested for each sample, and the average value is taken. A contact angle ≥150° is considered superhydrophobic, 130°≤θ<150° is hydrophobic, and θ<130° is hydrophilic.

[0049] Salt spray resistance test method: Prepare a 5% NaCl solution and spray it at a constant temperature of 35±1℃ at a rate of 1.5 mL / h for 100 consecutive hours. Record whether blistering, peeling, rusting, or discoloration occurs on the coating surface. Rating according to GB / T 1766-2008, with level 0 (no change) being the best and level 5 (severe corrosion) being the worst.

[0050] Table 1 Hydrophobicity and Durability

[0051] Examples 1-3 all had an initial contact angle >155°, meeting the superhydrophobic standard, and the surface showed no change after salt spray testing, indicating that the synergistic effect of modified ZIF-8, hydrophobic SiO2 and dual-effect microcapsules significantly improved the hydrophobic durability of the coating.

[0052] The contact angles of Comparative Examples 1 and 2 decreased significantly (>12%), and blistering or detachment occurred after salt spray testing, indicating that the electric field response self-healing of ZIF-8 and the micro-nano rough structure of SiO2 are crucial for maintaining superhydrophobicity.

[0053] The contact angle retention rate of Comparative Example 3 was slightly lower than that of the Examples, but better than that of Comparative Examples 1-2, indicating that excessive microcapsules may affect the coating density, but the performance loss can still be partially compensated by the self-healing function. At the same time, the color difference ΔE of the Examples was all <1.0, which was much better than that of the Comparative Examples (ΔE>1.8), indicating that the composite system of FEVE fluorocarbon resin and filler has excellent UV aging resistance.

[0054] Power frequency breakdown voltage test: Using a high-voltage test bench, the insulating sling is cut into sling segments with a diameter of 10 mm and a length of 100 mm. The voltage increase rate is 2 kV / s until breakdown occurs. The voltage value at the moment of breakdown is recorded, and the average value of 5 tests is taken (unit: kV / m).

[0055] Electrolytic corrosion life test (mass loss method): An electrolytic corrosion test apparatus (simulating a high-voltage electric field environment, voltage 10kV, frequency 50 Hz, electrode spacing 10 mm) was used. The insulating sling sample was fixed between the two electrodes and continuously energized for 240 h (simulating long-term high-voltage service). After the test, the sample was cleaned with anhydrous ethanol, dried at 60℃ to constant weight, and the mass loss was measured (unit: mg). The smaller the mass loss, the better the electrolytic corrosion resistance (≤1 mg is excellent, 1-5 mg is acceptable, >5 mg is unacceptable).

[0056] Table 2 Insulation and resistance to electrolytic corrosion

[0057] The power frequency breakdown voltages of Examples 1-3 were all ≥670 kV / m, far exceeding those of the comparative examples (≤580 kV / m), indicating that the introduction of modified ZIF-8 nanoparticles significantly improved the dielectric strength of the coating. Its high specific surface area and electric field response characteristics effectively dispersed the local electric field and suppressed corona discharge. The breakdown voltage of Comparative Example 1 (without ZIF-8) decreased by 23%, and that of Comparative Example 2 (without SiO2) decreased by 29%, demonstrating that the synergistic effect of ZIF-8 and hydrophobic SiO2 is crucial for maintaining high-voltage insulation performance.

[0058] Regarding resistance to electrolytic corrosion, the mass loss of Examples 1-3 was ≤0.5 mg, reaching the "excellent" standard. Comparative Example 1 (without ZIF-8) showed a mass loss of 2.1 mg, with localized coating detachment, indicating that the electric field-responsive self-healing function of ZIF-8 plays a crucial role in suppressing the propagation of electrolytic corrosion damage. Comparative Example 2 (without SiO2) showed the highest mass loss (3.8 mg), with severe coating detachment, indicating that the micro-nano rough structure of hydrophobic SiO2 can reduce the contact area for arc ablation and reduce thermal damage. Comparative Example 3 (8% microcapsules) had a mass loss of 1.2 mg, which, while better than Comparative Examples 1-2, was still higher than the examples, indicating that excessive microcapsules may reduce coating density, but the self-healing function can still partially compensate for the performance loss.

[0059] For any points not covered above, existing technologies shall apply.

[0060] Although specific embodiments of the present invention have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of the invention. Those skilled in the art can make various modifications or additions to the described specific embodiments or use similar methods to replace them, without departing from the direction of the invention or exceeding the scope defined by the appended claims. Those skilled in the art should understand that any modifications, equivalent substitutions, improvements, etc., made to the above embodiments based on the technical essence of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for preparing an anti-electro-erosion hydrophobic insulating composite material for flexible slings used in live-line work, characterized in that, The process includes the following steps: impregnating the insulating substrate in a composite anti-electro-erosion coating, vacuum drying for 12-24 hours, and hot-pressing curing; after cooling, spraying the surface with fluorinated liquid and then curing to obtain the anti-electro-erosion hydrophobic insulating composite material. The composite anti-electro-erosion coating comprises the following raw materials in parts by weight: 10-15 parts of silane-modified ZIF-8 nanoparticles, 5-10 parts of hydrophobic SiO2 nanoparticles, 8-13 parts of dual-effect microcapsules, 100 parts of fluorocarbon resin, 15-16 parts of solvent, and 0.5 parts of dispersant. The wall material of the dual-effect microcapsule is urea-formaldehyde resin, and the core material is fluorinated silicone oil and epoxy resin.

2. The preparation method according to claim 1, characterized in that, The concentration of fluorinated PFPE was 1 wt%, and it was cured at 120℃ for 30 min; the solvent was butyl acetate.

3. The preparation method according to claim 1, characterized in that, The mass ratio of fluorinated silicone oil to epoxy resin is 1:

1.

4. The preparation method according to claim 1, characterized in that, The preparation method of the dual-effect microcapsules includes the following steps: S1, urea, formaldehyde, and deionized water are dissolved and mixed. The pH is adjusted to 8.5-9 with ammonia. The mixture is heated to 70℃ and kept at that temperature for 1-1.5 hours to form a transparent and viscous linear urea-formaldehyde prepolymer solution. The solution is then cooled to room temperature and diluted with deionized water. S2. Mix fluorinated silicone oil with epoxy resin, heat and stir until uniform and transparent, add sodium dodecylbenzene sulfonate and deionized water, and emulsify to form a core material emulsion. S3. Slowly add the urea-formaldehyde prepolymer solution dropwise to the core material emulsion while stirring; adjust the pH of the system to 3.0 with 0.1 mol / L citric acid solution to initiate the urea-formaldehyde resin condensation reaction; Heat to 55℃ and hold for 3 hours, stirring continuously during this time to allow the urea-formaldehyde resin to cross-link and form a film on the surface of the core material. After the reaction was completed, the mixture was cooled to room temperature, centrifuged, washed, dried, and sieved to obtain dual-effect microcapsules.

5. The preparation method according to claim 1, characterized in that, In step S2, n-hexane is also added to the core material emulsion as a dispersion medium.

6. The preparation method according to claim 1, characterized in that, The particle size of the dual-effect microcapsules is 10-20 μm.

7. The preparation method according to claim 1, characterized in that, The preparation method of silane-modified ZIF-8 nanoparticles is as follows: γ-aminopropyltriethoxysilane is dissolved in anhydrous ethanol, and glacial acetic acid is added dropwise to adjust the pH to 4-5 to promote hydrolysis. The mixture is then sonicated to form a modified solution. ZIF-8 nanoparticles are then added to the ethanol and modified solution and refluxed. After cooling, the mixture is centrifuged, washed, and dried.

8. The preparation method according to claim 1, characterized in that, The insulating substrate is modified aramid fiber, and the preparation method of the insulating substrate is as follows: 1) Aramid fiber is selected as the insulating substrate, and plasma treatment is used to introduce hydroxyl or carboxyl groups; 2) Lubricating coating treatment: Prepare a mixture of silicone oil and white oil, add 0.5~1 wt% of octadecyl dimethyl benzyl ammonium chloride as an antistatic agent, pass the plasma-treated aramid fiber through the suspension at a speed of 10 m / min, control the coating thickness at 1-2 μm, and dry at 60℃ for 30 minutes. 3) Insulation substrate preparation: 8-12 twisted aramid fibers treated with lubricant coating are combined into strands; the three strands are woven together at a 120° angle, with a twist pitch of 6-8 times the rope diameter, to obtain the insulation substrate.

9. A hydrophobic insulating composite material for live-line work soft slings prepared by the preparation method according to any one of claims 1-8.

10. An anti-electro-erosion hydrophobic insulating composite material for live-line working flexible slings as described in claim 9, used for weaving live-line working flexible slings.

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