Electric insulation safety protective clothing material and preparation method thereof

Abstract

The invention relates to the field of safety protective clothing, and particularly discloses an electric insulation safety protective clothing material and a preparation method thereof. The electric insulation safety protective clothing material comprises an upper fabric layer, a middle layer and a lower fabric layer which are sequentially stacked from outside to inside, the upper fabric layer and the lower fabric layer are both EVA composite films, and the middle layer is an EVA film; the upper fabric layer, the middle layer and the lower fabric layer are connected into a whole in a dielectric heating mode. The electric insulation safety protection clothing material has the advantage that the insulation clothing material still keeps good insulation protection performance under the condition that the thickness of the insulation clothing material is reduced.

Description

Technical Field

[0001] This application relates to the field of safety protective clothing, and more specifically, to an electrically insulating safety protective clothing material and a preparation method thereof. Background Art

[0002] As a key protective equipment for high-voltage electric operation personnel, the technical development of electrically insulating clothing has always revolved around two core requirements: safety and practicality. In the operation and maintenance of the power system, staff often need to contact ultra-high voltage live environments above 7000V. At this time, the strong electric field formed between the human body and the live body is extremely likely to cause discharge accidents. The electrically insulating clothing builds a reliable insulating barrier to raise the human body potential to the same potential state as the live body, thereby eliminating the breakdown risk caused by the potential difference and becoming the last line of defense to ensure the safety of operators.

[0003] The current mainstream electrically insulating clothing adopts a single-layer manufacturing process of PVC (polyvinyl chloride) laminated fabric composite material. This material system shows specific advantages at the basic performance level. Polyvinyl chloride itself has stable dielectric properties, and its volume resistivity can reach the order of 10^12 Ω·cm. With the reinforcement structure of the laminated fabric, it can meet the insulation requirements for voltage levels above 7000V in the GB / T6568-2008 standard. At the same time, the material shows good acid and alkali corrosion resistance and can adapt to long-term use in the complex chemical environment of the substation.

[0004] However, in the actual application process, many technical defects have gradually emerged in the traditional single-layer structure. First of all, to ensure insulation reliability, the thickness of the single-layer material needs to be increased to more than 0.3mm, resulting in a significant increase in the rigidity of the fabric. Due to the thick and inflexible material, the protective clothing is not close-fitting and heavy when worn by the staff, affecting the normal operation of the staff and posing a safety hazard. Secondly, the single-layer structure lacks a redundant protection mechanism. When local damage occurs during the operation due to mechanical wear, arc burning or accidental rubbing, the insulation performance drops precipitously. At this time, the breakdown voltage may suddenly drop below the safety threshold, forming a fatal protection loophole. If the thickness of the insulating clothing is reduced, the insulating ability of the insulating clothing will be significantly reduced, and it cannot provide sufficient safety protection for the wearer. Summary of the Invention

[0005] In order to maintain good insulation protection performance of the insulating clothing material while reducing the thickness of the insulating clothing material, this application provides an electrically insulating safety protective clothing material and a preparation method thereof.

[0006] An electrically insulating safety protective clothing material provided by this application adopts the following technical scheme: An electrically insulating safety protective clothing material, comprising an upper fabric layer, an intermediate layer, and a lower fabric layer that are sequentially stacked from outside to inside. Both the upper fabric layer and the lower fabric layer are EVA composite films, and the intermediate layer is an EVA film. The upper fabric layer, the intermediate layer, and the lower fabric layer are integrally joined by dielectric heating.

[0007] By adopting the above technical solution, once the traditional single-layer PVC material is damaged, its insulation performance drops sharply. The three-layer structure of this application has a redundant protection mechanism. Even if one layer is damaged due to mechanical wear or arc burning, the remaining two layers can still maintain the insulation performance, significantly reducing the breakdown risk. The EVA material has a low density and is flexible, making it thinner and lighter than the traditional PVC material, and it fits the body better when worn, improving the operation flexibility. By selectively heating polar molecules in a high-frequency electric field, rapid interlayer welding is achieved, with high bonding strength and no adhesive residue, avoiding potential interface breakdown hazards.

[0008] Optionally, the EVA composite film is composed of a composite of an EVA film and one of nylon cloth or polyester cloth.

[0009] By adopting the above technical solution, the addition of nylon / polyester cloth significantly improves the tensile strength and tear resistance of the material, making up for the mechanical shortcoming of the pure EVA film. Through the hot pressing composite process, EVA and the fabric form a stable bond and remain intact after multiple bends, avoiding insulation failure caused by interface delamination of traditional coated fabrics.

[0010] Optionally, the raw materials of the EVA film include 40 - 60% of EVA resin, 10 - 15% of zinc borate, 10 - 15% of aluminum hydroxide, 5 - 10% of ammonium polyphosphate, 5 - 10% of zinc oxide, 5 - 10% of diatomaceous earth, 0.5 - 2% of iron oxide yellow, 0.5 - 2% of antioxidant, and 0.5 - 1% of dioctyl phthalate by mass percentage.

[0011] By adopting the above technical solution, zinc borate forms a glassy barrier layer at high temperatures, aluminum hydroxide absorbs heat and decomposes to release water vapor to dilute oxygen, and ammonium polyphosphate promotes carbonization. The three work together to make the limiting oxygen index (LOI) of the material ≥ 28%, and the vertical burning reaches UL94V - 0 level. Zinc oxide absorbs ultraviolet rays, and the antioxidant inhibits the oxidative degradation of EVA, extending the service life of the material in the outdoor environment. The plasticizer reduces the melt viscosity of EVA, ensuring uniform film forming and avoiding local insulation weakness caused by thickness deviation.

[0012] Optionally, the VA content in the EVA resin is 5 - 20%, and the melt index is 1 - 5 g / min.

[0013] By adopting the above technical solution, when the VA content is 5-20%, the EVA has a moderate crystallinity, and the material has both high flexibility and excellent insulation. The melt index of 1-5 g / min ensures that the film can be stably formed by blow molding or casting processes, avoiding problems such as melt fracture or uneven thickness.

[0014] Optionally, the thickness of the EVA film is 50-300 um, and the grammage is 50-350 g / m 2 .

[0015] By adopting the above technical solution, when the grammage is 350 g / m 2 , the total thickness is only 0.3 mm, which is 40% lighter than traditional PVC materials (above 0.5 mm). At the same time, the bending stiffness ≤ 5 mN, greatly improving the wearing comfort. EVA films with different thicknesses can meet the requirements of different voltage level scenarios.

[0016] Optionally, a self-healing material layer is added between the intermediate layer and the lower fabric layer. The self-healing material layer is composed of the following components: 10-20 wt% of microencapsulated epoxy resin, 5-10 wt% of mercaptan curing agent, and the rest is EVA resin.

[0017] By adopting the above technical solution, when microcracks are formed in the material due to mechanical damage, the microcapsules rupture to release epoxy resin and curing agent, which crosslink and repair quickly at the damaged area, ensuring the protection effect and service durability of the insulating protective clothing. The EVA matrix in the self-healing layer is compatible with the upper and lower layer materials, avoiding the introduction of conductive impurities and ensuring the stability of the overall insulation performance.

[0018] Optionally, the preparation method of the microencapsulated epoxy resin is as follows: Dissolve epoxy resin and photoinitiator in an organic solvent to form an oil phase, and sequentially coat thermosensitive poly(N-isopropylacrylamide) and polyurethane / polyurea on the surface of the oil droplets through emulsion polymerization to form microencapsulated epoxy resin.

[0019] By adopting the above technical solution, the critical solution temperature of poly(N-isopropylacrylamide) is 32 °C. When the damaged area is heated to above 40 °C due to friction, the intermediate layer shrinks and ruptures, accurately releasing epoxy resin to the damaged area. The polyurethane / polyurea shell ensures that the microcapsules will not rupture prematurely due to external force extrusion during processing and wearing.

[0020] In the second aspect, the present application provides a preparation method of an electrically insulating safety protective clothing material, adopting the following technical solution: A preparation method of an electrically insulating safety protective clothing material, including sequentially stacking the upper fabric layer, the intermediate layer, and the lower fabric layer, and performing dielectric heating process for welding and bonding to obtain the electrically insulating safety protective clothing material.

[0021] Further, the dielectric heating process uses a high-frequency band of 27.12 MHz, the welding and bonding heating temperature is 40-50 °C, the welding and bonding air pressure is 4-6 Mpa, the welding and bonding time is 3-6 s, and the welding current is 4-6 A.

[0022] Optionally, stack the upper fabric layer, the intermediate layer, the self-repairing material layer, and the lower fabric layer in sequence, and perform welding and bonding through the dielectric heating process to obtain the electrically insulating safety protective clothing material.

[0023] In summary, the present application has the following beneficial effects: 1. Due to the laminated design of the outer, middle, and inner three-layer EVA composite film and the film in the present application, combined with the dielectric heating joining process, a redundant protection structure is formed. Even if a single layer is damaged due to mechanical wear or arc damage, the remaining layers can still maintain the insulation performance, and the breakdown voltage stability is increased by more than 3 times, completely avoiding the "cliff-like failure" risk of traditional single-layer materials.

[0024] 2. In the present application, the thickness and gram weight of the EVA film are preferably optimized. The total weight of the material is reduced by 40%, the bending stiffness ≤ 5 mN, and the flexibility is increased by 50%. With the nylon / polyester composite reinforcement layer, while maintaining high tensile strength, it realizes conformable wearing, significantly improving the operation flexibility and safety.

[0025] 3. The present application adds a self-repairing layer, combined with a functionalized formula with flame retardancy and aging resistance, to form a dynamic protection system. The material can be quickly repaired after damage, the service life is extended, and it meets the long-term insulation requirements under complex working conditions. Specific Embodiments

[0026] The following further elaborates on the present application with reference to embodiments. It should be specifically noted that: for those conditions not specified in the following embodiments, they are carried out according to conventional conditions or the conditions recommended by the manufacturer. Except for special instructions, the raw materials used in the following embodiments can all be obtained from ordinary commercial sources.

[0027] Preparation Example of EVA Film Preparation Example 1 A preparation method of an EVA film: Prepare the following raw materials: 55 kg of EVA resin: Use the EVA resin V4110D (density 0.937 g / cm 3 ) produced by Yangzi Petrochemical - BASF Co., Ltd. The VA content in the EVA resin is 12% and the melt index is 3 g / min. Pre-dry it in an oven at 60 °C for 4 hours to remove moisture.

[0028] Flame retardants: 10 kg of zinc borate (Nantong Runfeng, industrial grade), 10 kg of aluminum hydroxide (Chinalco Shandong AH-1), and 6 kg of ammonium polyphosphate (Shandong Zhijia HT-208). They are each passed through a 200-mesh sieve to ensure uniform particle size.

[0029] Functional additives: 8 kg of zinc oxide (Zhuzhou Zhongle NAOAZO), 8 kg of diatomaceous earth (Lingshou Qihong QH-325), 1 kg of antioxidant BHT (Shandong Wenhui BHT501), 1 kg of plasticizer DOP (Jinan Zesheng ZS-DOP), all of which need to be dried, and 1 kg of iron oxide yellow (Shandong Jinghao 313).

[0030] Add the dried EVA resin, flame retardants, zinc oxide, diatomaceous earth, antioxidant BHT, plasticizer DOP, and iron oxide yellow to a high-speed mixer. Set the rotation speed to 1000 rpm, heat to 60 °C, and stir for 15 minutes to ensure uniform dispersion of each component.

[0031] Use a co-rotating twin-screw extruder with a screw rotation speed of 300 rpm. Set the temperature range as follows: Zone 1: 120 °C, Zone 2: 140 °C, Zone 3: 160 °C, Zone 4: 170 °C, Die head: 175 °C.

[0032] The extruded melt is cooled and pelletized by water to obtain flame-retardant EVA masterbatch.

[0033] Add the EVA masterbatch to a single-screw blown film machine with a screw diameter of 65 mm and L / D = 28:1. Set the temperature: Feeding zone: 150 °C, Compression zone: 170 °C, Homogenization zone: 180 °C, Die head: 185 °C. The blow-up ratio is 2.5:1, and the traction speed is 10 m / min. Then pass through a three-roll calender with the upper roll at 160 °C, the middle roll at 155 °C, and the lower roll at 150 °C, and the calendering speed is 5 m / min to obtain a 150-μm-thick EVA film with a grammage of 200 g / m 2 .

[0034] Preparation Example 2 A method for preparing an EVA film: Different from Preparation Example 1 in that it uses 50 kg of EVA resin, 12 kg of zinc borate, 12 kg of aluminum hydroxide, 8 kg of ammonium polyphosphate, 7 kg of zinc oxide, 7 kg of diatomaceous earth, 1 kg of pigment iron oxide yellow, 1 kg of antioxidant BHT, and 0.5 kg of dioctyl phthalate.

[0035] Preparation Example 3 A method for preparing an EVA film: Different from Preparation Example 1 in that it uses 60 kg of EVA resin, 8 kg of zinc borate, 8 kg of aluminum hydroxide, 5 kg of ammonium polyphosphate, 10 kg of zinc oxide, 10 kg of diatomaceous earth, 0.5 kg of pigment iron oxide yellow, 0.5 kg of antioxidant BHT, and 0.5 kg of dioctyl phthalate.

[0036] Preparation Example 4 A method for preparing an EVA film: The difference from Preparation Example 1 is that 35 kg of EVA resin, 18 kg of zinc borate, 18 kg of aluminum hydroxide, 12 kg of ammonium polyphosphate, 18 kg of zinc oxide, 6 kg of diatomaceous earth, 1.5 kg of pigment iron oxide yellow, 1.5 kg of antioxidant BHT, and 0.5 kg of dioctyl phthalate are used.

[0037] Preparation Example 5 A method for preparing an EVA film: The difference from Preparation Example 1 is that 65 kg of EVA resin, 5 kg of zinc borate, 5 kg of aluminum hydroxide, 3 kg of ammonium polyphosphate, 15 kg of zinc oxide, 15 kg of diatomaceous earth, 0.5 kg of pigment iron oxide yellow, 0.5 kg of antioxidant BHT, and 1 kg of dioctyl phthalate are used.

[0038] Preparation Example 6 A method for preparing an EVA film: The difference from Preparation Example 1 is that the VA content in the EVA resin is 1%.

[0039] Preparation Example 7 A method for preparing an EVA film: The difference from Preparation Example 1 is that the VA content in the EVA resin is 25%.

[0040] Preparation Example of Microencapsulated Epoxy Resin Preparation Example 8 A method for preparing a microencapsulated epoxy resin: Prepare the following raw materials: Epoxy resin: Bisphenol A type epoxy resin (E-51, epoxy value 0.51 eq / 100 g), 1000 g; Photoinitiator: Irgacure819 (phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide), 20 g; Organic solvent: Ethyl acetate (analytical pure), 2000 mL; Thermosensitive monomer: N-isopropylacrylamide (NIPAM, purity ≥ 99%), 100 g; Crosslinking agent: N,N'-methylenebisacrylamide (MBA, purity ≥ 98%), 5 g; Initiator: Ammonium persulfate (APS, purity ≥ 98%), 1 g; Emulsifier: Sodium dodecyl sulfate (SDS, purity ≥ 99%), 50 g; Polyurethane prepolymer: Isophorone diisocyanate (IPDI, NCO content ≥ 21.5%), 200 g; Polyamine: Ethylenediamine (EDA, purity ≥ 99%), 50 g; Deionized water: 5000 mL.

[0041] The preparation steps are as follows: Mix bisphenol A epoxy resin with a photoinitiator, add ethyl acetate, and stir magnetically at 500 rpm and 30 °C until completely dissolved to form a homogeneous oil-phase solution.

[0042] Add deionized water and an emulsifier to a clean container, keep the water bath at a constant temperature of 40 °C, and stir until the emulsifier is completely dissolved to obtain an aqueous-phase solution; Slowly pour the oil-phase solution from the previous step into the aqueous-phase solution, and emulsify it with a high-speed disperser at 1500 rpm for 10 minutes to form an oil-in-water (O / W) emulsion; Add N-isopropylacrylamide, a crosslinking agent, and an initiator to the emulsion in sequence, heat it to 70 °C under nitrogen protection, react for 4 hours, and cool to room temperature after the reaction is completed; Drop the polyurethane prepolymer into the emulsion after the above reaction, mechanically stir and react at 500 rpm at 25 °C for 2 hours to form a polyurethane prepolymer layer, then add ethylenediamine and continue to react for 3 hours to complete the polyurea crosslinking.

[0043] After the reaction is completed, centrifuge the emulsion after the crosslinking reaction at 3000 rpm for 10 minutes, collect the precipitate, wash the precipitate 3 times with deionized water, place the precipitate in a vacuum drying oven and dry it at 40 °C for 24 hours to obtain dry microencapsulated epoxy resin. Example

[0044] Example 1 A preparation method of an electrically insulating safety protective clothing material: Prepare the following raw materials: EVA film (prepared by Preparation Example 1), nylon cloth (gram weight 120 g / m 2 , breaking strength ≥ 30 MPa, Zhejiang Hengyi Group); Stack the EVA film and the nylon cloth, send them into a hot pressing and laminating machine, at a temperature of 150 °C, a pressure of 2 MPa, and a time of 30 seconds. After cooling, an EVA composite film is obtained.

[0045] Stack the materials in the following order: Upper fabric layer: EVA composite film, with the nylon cloth side facing the middle layer; Middle layer: EVA film; Lower fabric layer: EVA composite film, with the nylon cloth side facing the middle layer; For the dielectric heating equipment, a high-frequency plastic welder is selected. The stacked materials are placed on the workbench of the high-frequency plastic welder, and the frequency is set to 27.12 MHz, the heating temperature is 45 °C, the pressure is 5 MPa, the time is 5 seconds, and the current is 5 A. Start the equipment to complete the welding and bonding. After the bonding is completed, cool it to room temperature to obtain the electrically insulating safety protective clothing material.

[0046] Example 2 A preparation method of an electrically insulating safety protective clothing material: The difference from Example 1 is that the EVA film is prepared from Preparation Example 2.

[0047] Example 3 A preparation method of an electrically insulating safety protective clothing material: The difference from Example 1 is that the EVA film is prepared from Preparation Example 3.

[0048] Example 4 A preparation method of an electrically insulating safety protective clothing material: The difference from Example 1 is that the EVA film is prepared from Preparation Example 6.

[0049] Example 5 A preparation method of an electrically insulating safety protective clothing material: The difference from Example 1 is that the EVA film is prepared from Preparation Example 7.

[0050] Example 6 A preparation method of an electrically insulating safety protective clothing material: The difference from Example 1 is that the nylon cloth is replaced with polyester cloth.

[0051] Example 7 A preparation method of an electrically insulating safety protective clothing material: Prepare the following raw materials: EVA film (prepared from Preparation Example 1), nylon cloth (gram weight 120 g / m 2 , breaking strength ≥ 50 MPa, Zhejiang Hengyi Group), microencapsulated epoxy resin (prepared by the process described in Preparation Example 8), mercaptan curing agent (TMPMP, functionality 3), EVA resin; Stack the EVA film and the nylon cloth, and send them into a hot press laminator at a temperature of 150 °C, a pressure of 2 MPa, and a time of 30 seconds. After cooling, obtain the EVA composite film; Add 77 kg of EVA resin, 15 kg of microencapsulated epoxy resin, and 8 kg of mercaptan curing agent to a high-speed mixer, and mix at a speed of 800 rpm and a temperature of 50 °C for 15 minutes; send the mixture into a twin-screw extruder and extrude pellets at 170 °C. Add the masterbatch to a blown film machine, set the feeding zone at 150 °C, the compression zone at 170 °C, the die head at 185 °C, the blow-up ratio at 2.5:1, and the traction speed at 10 m / min to obtain a self-healing film with a thickness of 100 μm; Stack the materials in the following order: Upper fabric layer: EVA composite film, with the nylon cloth side facing the middle layer; Middle layer: EVA film; Self-healing material layer: Self-healing film; Lower fabric layer: EVA composite film, with the nylon cloth side facing the middle layer; The dielectric heating equipment selects a high-frequency plastic welder. Place the stacked materials on the workbench of the high-frequency plastic welder, and set the frequency to 27.12 MHz, the heating temperature to 45 °C, the pressure to 5 MPa, the time to 5 seconds, and the current to 5 A; start the equipment to complete the welding and bonding. After the bonding is completed, cool it to room temperature to obtain the electrically insulating safety protective clothing material.

[0052] Example 8 A preparation method of an electrically insulating safety protective clothing material: The difference from Example 7 is that the components of the self-healing film are 10 kg of microencapsulated epoxy resin, 5 wt% of mercaptan curing agent, and 85 kg of EVA resin.

[0053] Example 9 A preparation method of an electrically insulating safety protective clothing material: The difference from Example 7 is that the components of the self-healing film are 20 kg of microencapsulated epoxy resin, 10 wt% of mercaptan curing agent, and 70 kg of EVA resin.

[0054] Comparative example Comparative example 1 A preparation method of an electrically insulating safety protective clothing material: The difference from Example 1 is that the EVA film is prepared from Preparation Example 4.

[0055] Comparative example 2 A preparation method of an electrically insulating safety protective clothing material: The difference from Example 1 is that the EVA film is prepared from Preparation Example 5.

[0056] Comparative example 3 A preparation method of an electrically insulating safety protective clothing material: The difference from Example 1 is that both the upper fabric layer and the lower fabric layer use EVA films and are not compounded with nylon cloth.

[0057] Performance detection test Insulation performance Breakdown voltage (GB / T 1408.1-2016): The electrode spacing is 10 mm, and the voltage rising rate is 1 kV / s.

[0058] Volume resistivity (GB / T 1410-2006): Measured under a DC voltage of 500 V.

[0059] Flame retardant performance Limiting Oxygen Index (LOI) (GB / T 2406-2008): Specimen size 100mm × 10mm × 3mm.

[0060] Vertical Burning Rating (GB / T 2408-2021): UL94 standard, record the self-extinguishing time and dripping condition.

[0061] Mechanical Properties Tensile Strength (GB / T 1040.3-2006): Specimen type 1B, tensile rate 50mm / min.

[0062] Elongation at Break (GB / T 1040.3-2006): Same as the tensile test.

[0063] Self-healing Performance Repair Efficiency: Scratch depth 200μm, heat at 60°C for 30 minutes, test the recovery rate of tensile strength.

[0064] Flexibility Flexural Rigidity (ASTM D4032-2008): Simulate the bending of human joints (90° cycle 1000 times).

[0065] Table 1 Test Data Combining Example 1 and Comparative Examples 1-2 and referring to Table 1, it can be seen that in Comparative Example 1, the EVA resin is 35%, the flame retardant is 48%, the breakdown voltage is only 12 kV, and the volume resistivity is as low as 2×10 12 Ω·cm. The tensile strength is 28 MPa and the elongation at break is 350%, both of which are inferior to those of Example 1 of this application. This is because the excessive flame retardant squeezes the EVA matrix, destroying the continuous phase structure, resulting in a significant decline in insulation and mechanical properties. In Comparative Example 2, the EVA resin is 65% and the flame retardant is 13%, and the LOI is only 24%, and the vertical burning rating drops to UL94 HB. It can be seen that the proportion of the flame retardant is insufficient to form an effective barrier layer. The proportion of the flame retardant needs to be controlled within 20-30%, and too high or too low will lead to performance imbalance.

[0066] Combining Example 1 and Comparative Example 3 and referring to Table 1, it can be seen that the mechanical properties and flexibility of Comparative Example 3 have deteriorated. It can be seen that the nylon / polyester composite layer significantly improves the mechanical properties and flexibility of the material through fiber reinforcement.

[0067] Combining Examples 1-3 and referring to Table 1, it can be seen that increasing the proportion of the flame retardant can slightly increase the LOI, but excessive addition will sacrifice the mechanical properties. Increasing the proportion of zinc oxide and diatomite can significantly improve the insulation.

[0068] Combined with Examples 1, 4, and 5 and Table 1, it can be seen that when the VA content is too low and the crystallinity of EVA is too high, the rigidity of the material increases. When the VA content is too high, the increase in polar groups leads to an increase in hygroscopicity and a decrease in insulation. The VA content needs to be controlled within 5-20% to balance flexibility and insulation.

[0069] Combined with Examples 1 and 6 and Table 1, it can be seen that both nylon and polyester can be used as the reinforcing layer, and the choice depends on cost and chemical resistance requirements.

[0070] Combined with Examples 1, 7-9 and Table 1, it can be seen that the self-healing layer repairs damage by releasing epoxy resin from microcapsules. At the same time, the high filler ratio in Example 9 can further improve insulation, achieving the dual effects of "repair + enhancement".

[0071] This specific embodiment is only an interpretation of the present application, and it does not limit the present application. After reading this specification, those skilled in the art can make modifications to this embodiment without creative contributions as needed, but as long as it is within the scope of the claims of the present application, it is protected by the patent law.

Claims

1. An electrical insulating safety protective clothing material, characterized in that: It comprises an upper fabric layer, a middle layer and a lower fabric layer which are stacked in sequence from the outside to the inside, wherein the upper fabric layer and the lower fabric layer are both EVA composite films, and the middle layer is an EVA film; the upper fabric layer, the middle layer and the lower fabric layer are all joined as a whole by dielectric heating.

2. The electrical insulating safety protective clothing material according to claim 1, characterized in that: The EVA composite film is formed by compounding an EVA film with nylon cloth or polyester cloth.

3. The electrical insulating safety protective clothing material according to claim 1 or 2, characterized in that: The raw materials of the EVA film include, by mass percentage, 40-60% EVA resin, 10-15% zinc borate, 10-15% aluminum hydroxide, 5-10% ammonium polyphosphate, 5-10% zinc oxide, 5-10% diatomaceous earth, 0.5-2% yellow iron oxide, 0.5-2% antioxidant, and 0.5-1% dioctyl phthalate.

4. The electrical insulating safety protective clothing material according to claim 3, characterized in that: The EVA resin has a VA content of 5-20% and a melt index of 1-5 g / min.

5. The electrical insulating safety protective clothing material according to claim 1, characterized in that: The thickness of the EVA film is 50-300um and the weight is 50-350g / m 2 .

6. The electrical insulating safety protective clothing material according to claim 1, characterized in that: A self-repairing material layer is added between the middle layer and the lower fabric layer, and the self-repairing material layer is composed of the following components: 10-20wt% microencapsulated epoxy resin, 5-10wt% thiol curing agent, and the rest is EVA resin.

7. The electrical insulating safety protective clothing material according to claim 6, characterized in that: The preparation method of the microencapsulated epoxy resin is: The epoxy resin and the photoinitiator are dissolved in an organic solvent to form an oil phase, and the temperature-sensitive poly(N-isopropylacrylamide) and polyurethane / polyurea are sequentially coated on the surface of the oil droplet through emulsion polymerization to form microencapsulated epoxy resin.

8. A method for preparing the electrical insulating safety protective clothing material according to any one of claims 1 to 7, characterized in that: The upper fabric layer, the middle layer and the lower fabric layer are stacked in sequence, and are welded and bonded by a dielectric heating process to obtain an electrically insulating safety protective clothing material.

9. The method for preparing the electrical insulating safety protective clothing material according to claim 8, characterized in that: The upper fabric layer, the middle layer, the self-repairing material layer and the lower fabric layer are stacked in sequence, and are welded and bonded by a dielectric heating process to obtain an electrically insulating safety protective clothing material.

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