High-resistance arc protection clothes and preparation method thereof

Abstract

The invention discloses a high-resistance arc protection garment and a preparation method thereof, and belongs to the technical field of protection garments. The electric arc protection clothing is composed of a surface layer, a heat insulation layer and a comfortable layer, and a phosphorus-containing complexing agent composite system is introduced in the preparation of conductive fibers, so that the complexing stability of copper ions and the carbon forming capacity of the fibers are improved; the surface layer is formed by blending and weaving polyimide fibers, conductive fibers, flame-retardant aramid fibers and flame-retardant viscose fibers, the heat insulation layer is made into a non-woven fabric flocculus felt from the polyimide fibers, the flame-retardant aramid fibers and the flame-retardant viscose fibers, and the comfortable layer is formed by knitting the flame-retardant aramid fibers, the flame-retardant viscose fibers and flame-retardant polyester fibers. Through the collaborative design of the three-layer structure, the conductive stability, the flame-retardant heat-insulating performance and the wearing comfort of the electric arc protection suit are remarkably improved, and the electric arc protection suit has a good application prospect in the high-temperature electric arc protection field in the industries of electric power, metallurgy and the like.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of protective clothing, in particular to a high-resistance anti-electric arc clothing and a preparation method thereof. BACKGROUND

[0002] With the improvement of safety production requirements in the power, metallurgy and other industries, anti-electric arc clothing as the key equipment to protect workers from electric arc injury, its protective performance, electric conductivity stability and wearing comfort have become research hotspots. The existing anti-electric arc clothing mainly realizes the protection function by combining flame-retardant fibers (such as meta-aramid, flame-retardant viscose) and conductive fibers, and designing multi-layer structure, in which the conductive fibers are used to dissipate electric arc energy, and the flame-retardant fibers and thermal insulation layer are used to block heat transfer, which together constitute a conductive-flame-retardant-thermal insulation collaborative protection system.

[0003] The existing related technologies have the following disadvantages: Chinese patent CN116411376A improves the protection by adding a small amount of copper complex conductive fiber, but the amount of conductive fiber is only 2-3 parts, the continuity of the conductive network is poor, and the electric conductivity is easy to decay after electric arc impact; Chinese patent CN114261149A uses polyimide hollow fiber to construct a thermal insulation layer, which can reduce weight, but does not optimize the high-temperature stability of the conductive fiber, and the migration of copper ions leads to the destruction of the conductive network; Chinese patent CN115723401A realizes high anti-electric arc value by combining the surface fabric with a multifunctional felt, but relies on phase change fibers and black heat-absorbing components, which has high cost and limited applicability of light color, and cannot solve the problem of collaborative improvement of electric conductivity and anti-electric arc.

[0004] In summary, the core defects of the existing technology are that the conductive components (such as copper ions) in the conductive fiber are easy to oxidize or migrate under high temperature of electric arc, leading to failure of the conductive network; single flame-retardant or thermal insulation design cannot balance the electric conductivity stability and the formation of dense carbon layer under high temperature; the matching degree of the fiber types and the ratio of the multi-layer structure is insufficient, which easily leads to imbalance between protective performance and comfort. Therefore, it is a technical problem to be solved in the field to develop a high-resistance anti-electric arc clothing that can simultaneously improve the electric conductivity stability, anti-electric arc ability and wearing comfort. SUMMARY

[0005] In view of the deficiencies in the prior art, the present application aims to provide a high-resistance anti-electric arc clothing and a preparation method thereof.

[0006] In order to achieve the above-mentioned application purpose, the present application adopts the following technical solution:

[0007] The preparation method of the high-resistance anti-electric arc clothing is as follows:

[0008] Step 1, preparation of conductive fiber: acrylon short fibers are soaked in a mixed solution, treated under stirring at elevated temperature, taken out, washed to neutral and dehydrated to obtain pretreated acrylon short fibers; the pretreated acrylon short fibers are added into a copper nitrate dimethylformamide solution, and ethylene glycol and phosphorus-containing complexing agent are added, stirred uniformly, and then heated and kept warm; then triisopropanolamine is added, treated at a certain temperature, cooled, and the fibers are separated, washed to remove residual copper salt, and dried to obtain conductive fibers;

[0009] Step 2, preparation of face layer, thermal insulation layer and comfort layer: the face layer is made of polyimide fibers, conductive fibers, flame-retardant aramid fibers and flame-retardant viscose fibers as raw materials, and double yarns are made by spinning process, and then woven into woven plain fabric; the thermal insulation layer is made of polyimide fibers, flame-retardant aramid fibers and flame-retardant viscose fibers as raw materials, and non-woven fabric is formed by laying and needling, and then heat setting treatment is carried out; the comfort layer is made of flame-retardant aramid fibers, flame-retardant viscose fibers and flame-retardant polyester fibers, which are blended into yarns, and then woven into plain knitted fabric;

[0010] Step 3, preparation of high-resistance anti-electric arc clothing: the face layer, the thermal insulation layer and the comfort layer are cut into pieces respectively, and then overlapped in the order of comfort layer inside, thermal insulation layer in the middle and face layer outside, and then sewn into shape using flame-retardant sewing thread, and a layer of reinforcing piece of the same material is added to the shoulder, elbow and knee areas, and then the high-resistance anti-electric arc clothing is obtained.

[0011] Preferably, the preparation method of the high-resistance anti-electric arc clothing is as follows:

[0012] Step 1, preparation of conductive fiber: acrylon short fibers are soaked in a mixed solution, treated under stirring at elevated temperature, taken out, washed to neutral and dehydrated to obtain pretreated acrylon short fibers; the pretreated acrylon short fibers are added into a copper nitrate dimethylformamide solution, and ethylene glycol and phosphorus-containing complexing agent are added, stirred uniformly, and then heated and kept warm; then triisopropanolamine is added, treated at a certain temperature, cooled, and the fibers are separated, washed to remove residual copper salt, and dried to obtain conductive fibers;

[0013] Step 2, preparation of the surface layer, the thermal insulation layer and the comfort layer: the surface layer is prepared by mixing and spinning polyimide fibers 50-60 parts, conductive fibers 5-15 parts prepared in step 1, flame-retardant aramid fibers 15-25 parts, and flame-retardant viscose fibers 10-20 parts by mass fraction, to obtain a single strand of short fiber yarn, and then doubling to obtain a double strand of yarn, which is used as warp and weft to weave into a woven plain fabric with a weight of 120-200 g / m 2 , that is, the surface layer; the thermal insulation layer is prepared by mixing and laying the fiber web on a web former after opening the polyimide fibers 40-60 parts, the flame-retardant aramid fibers 15-25 parts, and the flame-retardant viscose fibers 20-40 parts by mass fraction, and then forming a non-woven fabric sheet with a unit area mass of 100-150 g / m 2 , and then heat setting to obtain the thermal insulation layer; the yarn used for the comfort layer is prepared by mixing and spinning flame-retardant aramid fibers, flame-retardant viscose fibers and flame-retardant polyester fibers in a mass ratio of 30-50:20-40:20-40, and then doubling to obtain a double strand of yarn, which is knitted into a plain knitted fabric with a weight of 120-180 g / m 2 , that is, the comfort layer;

[0014] Step 3, preparation of the high-resistance anti-electric arc clothing: the surface layer, the thermal insulation layer and the comfort layer prepared in step 2 are cut and sewn to obtain the corresponding surface layer piece, the thermal insulation layer piece and the comfort layer piece; during sewing, the comfort layer piece is placed on the inner side, the thermal insulation layer piece is placed in the middle, and the surface layer piece is placed on the outer side, and then they are sewn in sequence using flame-retardant aramid sewing thread, and a layer of surface layer reinforcing piece is added at the shoulder, elbow and knee, to obtain the high-resistance anti-electric arc clothing.

[0015] The solid-liquid ratio of the acrylic fiber to the mixed solution is 1:10-30 g / mL.

[0016] The concentration of tartaric acid in the mixed solution is 5-15 g / L, the concentration of acrylic acid is 1-5 g / L, and the concentration of the surfactant is 0.5-2 g / L.

[0017] The solid-liquid ratio of the pretreated acrylic fiber to the copper nitrate dimethylformamide solution is 1:10-20 g / mL, and the concentration of the copper nitrate dimethylformamide solution is 0.3-0.8 mol / L.

[0018] The surfactant is at least one of alkyl polyoxyethylene ether, alkyl glycoside, sodium dodecyl benzene sulfonate, and fatty alcohol polyoxyethylene ether sodium sulfate.

[0019] The phosphorus-containing complexing agent is at least one of phytic acid, ammonium polyphosphate, phosphorous acid, hydroxyethylidene diphosphonic acid, ammonium dihydrogen phosphate, sodium dihydrogen phosphate, sodium tripolyphosphate, melamine polyphosphate.

[0020] The phosphorus-containing complexing agent is phytic acid and ammonium polyphosphate, and the mass ratio is 0.5-2:0.5-2.

[0021] The phosphorus-containing complexing agent is phytic acid, ammonium polyphosphate and melamine polyphosphate, and the mass ratio is 0.5-2:0.5-2:0.1-0.3.

[0022] The design of the present application is first to solve the contradiction that the conductive fiber not only needs to be conductive, but also needs to be resistant to electric arc. The traditional copper complex acrylic fiber is easy to migrate or oxidize under high temperature and electric arc impact, and the conductive performance decays obviously, and the overall anti-arc level is limited. Therefore, a phosphorus-containing complexing agent is introduced in the preparation process of the conductive fiber, which can form a stable complex structure with copper ions through multi-tooth coordination on one hand, and firmly fix copper around the acrylic macromolecule, improve the thermal stability and washing fastness; on the other hand, it can be converted into phosphoric acid, polyphosphoric acid and other species in the subsequent heating process, providing potential carbon source for the fiber, and forming a synergistic flame retardant system with polyimide, flame-retardant aramid and flame-retardant viscose, laying a foundation for realizing high flame-retardant anti-arc clothing.

[0023] On this basis, the present application further realizes that a single phosphorus-containing complexing agent has its own advantages in coordination mode, thermal decomposition temperature and carbonization efficiency, and it is difficult to simultaneously consider the stability of copper ions at low temperature stage and the construction of dense carbon layer at high temperature stage. Therefore, in the design, a composite phosphorus-containing complexing agent is used, phytic acid with organic polyphosphorus hydroxyl structure and ammonium polyphosphate which can continuously generate polyphosphoric acid at high temperature are combined, so that the former can play a chelating and initial carbonization role at a lower temperature zone, and the latter can continuously provide polyphosphoric acid skeleton and inorganic flame retardant contribution at a higher temperature zone, and the two are complementary in time scale and phase state. Through this composite design, a more stable copper complex layer and a continuous phosphorus-based carbon layer can be constructed on the surface of the conductive fiber, which can significantly reduce the damage of electric arc impact to the conductive network and the fiber skeleton, and realize obvious synergistic effect.

[0024] Further, the present application introduces nitrogen-containing melamine polyphosphate on the basis of the phytic acid / ammonium polyphosphate composite system, which is based on the comprehensive consideration of the nitrogen-phosphorus intumescent flame retardant mechanism. On the one hand, melamine polyphosphate releases inert gas at high temperature, promotes the expansion and foaming of the phosphorus-based carbon layer, and forms a thicker and denser intumescent carbon shell, which has a physical shielding effect on the copper complex layer and the three-layer structure of the fiber, like a suit of armor; on the other hand, the polyphosphoric acid species produced by its decomposition can form a continuous phosphoric acid network with phytic acid and ammonium polyphosphate, thereby synergistically improving the adhesion and anti-washing ability of the carbon layer. Through the introduction of this third component, the present application further improves the barrier ability of arc heat and light radiation while maintaining excellent electrical conductivity stability, so that the high-resistance anti-arc clothing can still maintain the integrity of the structure and protective performance under extreme working conditions.

[0025] Compared with the prior art, the present application has the following advantages:

[0026] 1) The present application introduces a specific phosphorus-containing complex system into the conductive fiber, which not only improves the thermal stability and fixation of the conductive component at high arc temperature, but also significantly improves the anti-arc ability and electrical conductivity stability after arc impact, overcoming the defect that the electrical conductivity of existing anti-arc clothing easily decays.

[0027] 2) The present application adopts a three-layer composite structure of a surface layer, a thermal insulation layer and a comfort layer, and realizes excellent flame-retardant thermal insulation and mechanical strength by reasonably matching the fiber types and grammage of each layer, thereby effectively reducing the overall weight of the clothing while meeting the high-level arc protection requirements, and the clothing is soft and breathable, and the comfort is significantly better than that of the prior art.

[0028] 3) The present application adopts a solution complexation and finishing method, and the process flow is simple and the conditions are easy to control. The obtained fiber has stable washing resistance and multiple arc impact resistance, and can be directly matched with conventional spinning, weaving and sewing processes, and the product consistency is good, which is convenient for realizing large-scale and standardized production. DETAILED DESCRIPTION

[0029] Main material sources:

[0030] Acrylic staple fiber, linear density: 1.5 dtex, length: 38-51 mm.

[0031] Polyimide fiber, length: 31-38 mm, linear density: 1.7 dtex.

[0032] Flame-retardant aramid fiber, material: meta-aramid, length: 38-51 mm, linear density: 1.5 dtex.

[0033] Flame-retardant viscose fiber, linear density: 1.7 dtex, length: 38-51 mm.

[0034] Flame-retardant polyester fiber, linear density: 1.5 dtex, length: 32-38 mm.

[0035] Flame-retardant aramid sewing thread, material: meta-aramid, linear density: 30tex, breaking strength: ≥10 N, temperature resistance ≥260℃.

[0036] Ammonium polyphosphate, item number: 6895-569, Zhengzhou Xinke Chemical Products Co., Ltd.

[0037] Melamine polyphosphate, product model: 45345, Shanghai Gaoming Chemical Co., Ltd.

[0038] Sodium tripolyphosphate, CAS No.: 7758-29-4, Molecular formula: Na₂O 10 P3.

[0039] All other raw materials used in the embodiments and comparative examples of this invention are commercially available products.

[0040] Example 1

[0041] A method for preparing a high-resistivity arc-proof suit is as follows:

[0042] Step 1: Preparation of conductive fibers: Acrylic short fibers were immersed in a mixed solution at a solid-liquid ratio of 1:20 g / mL. The mixed solution contained tartaric acid at a concentration of 10 g / L, acrylic acid at a concentration of 3 g / L, and sodium dodecylbenzenesulfonate at a concentration of 1 g / L. The solution was heated to 70°C under stirring and immersed for 15 min. After immersion, the fibers were removed, washed with water until neutral, and dehydrated to obtain pretreated acrylic short fibers. The pretreated acrylic short fibers were then added to 0.5 mol / L nitric acid solution at a solid-liquid ratio of 1:15 g / mL. In a copper dimethylformamide solution, 2 wt% ethylene glycol and 2.5 wt% phosphorus-containing complexing agent of pretreated acrylic short fibers were added simultaneously. After stirring evenly, the solution was heated to 90°C and kept at that temperature for 30 min. Then, 10 wt% triisopropanolamine of pretreated acrylic short fibers was added to the above mixed solution. The solution was treated at 50°C for 60 min, cooled to room temperature, and the fibers were separated from the solution. The fibers were washed repeatedly with water until no obvious copper salt residue was found in the washing liquid. The fibers were then dried with hot air at 60°C to obtain conductive fibers.

[0043] Step 2: Preparation of the surface layer, insulation layer, and comfort layer: For the surface layer, weigh out 55 parts by weight of polyimide fiber, 10 parts by weight of the conductive fiber prepared in Step 1, 20 parts by weight of flame-retardant aramid fiber, and 15 parts by weight of flame-retardant viscose fiber. These are then blended and spun into single-strand staple yarns through processes such as opening and cleaning, carding, drawing, roving, and spinning. These single-strand staple yarns are then combined to prepare double-strand yarns, which are used as both warp and weft yarns, resulting in a fabric with a weight of 160 g / m². 2The machine-woven plain weave fabric is used to obtain the surface layer; the insulation layer consists of 50 parts by weight of polyimide fiber, 20 parts by weight of flame-retardant aramid fiber, and 30 parts by weight of flame-retardant viscose fiber. After opening and mixing, the fibers are laid on a web forming machine to form a fiber web, which is then reinforced by needle punching to form a unit area mass of 120g / m². 2 The non-woven wadding felt is heat-set to obtain the insulation layer; the yarn used for the comfort layer is a blend of flame-retardant aramid fiber, flame-retardant viscose fiber, and flame-retardant polyester fiber in a mass ratio of 40:30:30. After the three fibers are weighed according to the above ratio, they are processed through opening and cleaning, carding, drawing, roving, and spinning to obtain single-ply staple yarn, which is then plyed into double-ply yarn. This double-ply yarn is then knitted on a knitting machine to produce a yarn with a weight of 140g / m². 2 Plain knit fabrics provide a comfortable layer;

[0044] Step 3: Preparation of high-resistance arc flash protection clothing: Cut the outer layer, heat insulation layer and comfort layer obtained in step 2 into corresponding outer layer pieces, heat insulation layer pieces and comfort layer pieces; when sewing, place the comfort layer piece on the inside, the heat insulation layer piece in the middle and the outer layer piece on the outside, and sew them together in sequence using flame-retardant aramid thread. Add a reinforcing piece of the same material as the outer layer at the shoulder, elbow and knee, and the high-resistance arc flash protection clothing is obtained.

[0045] The phosphorus-containing complexing agent is phytic acid.

[0046] Example 2

[0047] The preparation method of a high-resistance anti-arc suit is basically the same as that in Example 1, except that the phosphorus-containing complexing agent is ammonium polyphosphate.

[0048] Example 3

[0049] The preparation method of a high-resistance anti-arc suit is basically the same as that in Example 1, except that the phosphorus-containing complexing agent is phosphorous acid.

[0050] Example 4

[0051] The preparation method of a high-resistance arc-proof suit is basically the same as that in Example 1, except that the phosphorus-containing complexing agent is hydroxyethylidene diphosphonic acid.

[0052] Example 5

[0053] The preparation method of a high-resistance anti-arc suit is basically the same as that in Example 1, except that the phosphorus-containing complexing agent is ammonium dihydrogen phosphate.

[0054] Example 6

[0055] The preparation method of a high-resistance arc-proof garment is basically the same as that in Example 1, except that the phosphorus-containing complexing agent is sodium dihydrogen phosphate.

[0056] Example 7

[0057] The preparation method of a high-resistance arc-proof garment is basically the same as that in Example 1, except that the phosphorus-containing complexing agent is sodium tripolyphosphate.

[0058] Example 8

[0059] The preparation method of a high-resistance anti-arc suit is basically the same as that in Example 1, except that the phosphorus-containing complexing agent is sodium hexametaphosphate.

[0060] Example 9

[0061] The preparation method of a high-resistance anti-arc suit is basically the same as that in Example 1, except that the phosphorus-containing complexing agent is composed of phytic acid and ammonium polyphosphate in a mass ratio of 1:1.

[0062] Example 10

[0063] The preparation method of a high-resistance anti-arc suit is basically the same as that in Example 1, except that the phosphorus-containing complexing agent is composed of ammonium dihydrogen phosphate and sodium dihydrogen phosphate in a mass ratio of 1:1.

[0064] Example 11

[0065] The preparation method of a high-resistance anti-arc suit is basically the same as that in Example 1, except that the phosphorus-containing complexing agent is composed of phytic acid, ammonium polyphosphate and melamine polyphosphate in a mass ratio of 1:1:0.2.

[0066] Comparative Example 1

[0067] The preparation method of a high-resistance anti-arc suit is basically the same as that of Example 1, except that the phosphorus-containing complexing agent is not added.

[0068] Comparative Example 2

[0069] The preparation method of a high-resistance anti-arc clothing is basically the same as that of Example 1, except that the conductive fiber in step 2 is replaced with an equal amount of acrylic short fiber.

[0070] Test Example 1

[0071] Arc resistance value test:

[0072] The testing method is as follows: High-resistance arc-proof suits prepared in Examples 1-11 and Comparative Examples 1-2 were selected and cut into three-layer composite samples of 400mm×400mm. Six samples were prepared for each example and comparative example for repeated testing.

[0073] According to the "DL-T320-2010 General Technical Requirements for Personal Arc Protective Equipment", the prepared samples were tested for the protection level ATPV (Arc Heat Resistance Standard Value); the results are shown in Table 1.

[0074] Table 1

[0075] Experimental protocol ATPV (cal / cm 2 )]]> Example 1 26.3 Example 2 26.8 Example 3 26.1 Example 4 27.5 Example 5 25.6 Example 6 25.4 Example 7 26.9 Example 8 26.2 Example 9 32.4 Example 10 25.6 Example 11 36.2 Comparative Example 1 21.9 Comparative Example 2 17.8

[0076] Test Example 2

[0077] Test of fabric surface resistivity retention after arc impact:

[0078] Test method: Select the high-resistance arc protection suits obtained in Examples 1-11 and Comparative Examples 1 and 2, and cut them into 100mm×100mm samples; pre-condition the temperature and humidity: 20±2℃, relative humidity 65±5%, and place for 24h.

[0079] The initial surface resistance was determined according to GB / T12703.2 "Evaluation of electrostatic properties of textiles - Part 2: Resistance method"; a surface resistance tester was used, equipped with parallel or ring electrodes; the sample was placed on an insulating base, clamped or pressed with electrodes, a voltage V was applied, and the current value I after stabilization was read, and the surface resistance Rs0 was calculated: Rs0 = V / I; 5 points were measured for each sample, and the average value was taken as the initial surface resistance of this example.

[0080] Arc impact treatment was performed using the same arc testing apparatus as in Test Example 1, applying a fixed arc energy level of 20 cal / cm² to the sample. 2 Each sample only needs to be subjected to one impact. The surface resistance retention rate of the fabric after the arc impact is calculated as η = (resistance before impact / resistance after impact) × 100%. The test results are shown in Table 2.

[0081] Table 2

[0082] Experimental protocol Resistance retention rate η (%) Example 1 70.5 Example 2 71.8 Example 3 69.7 Example 4 74.3 Example 5 68.9 Example 6 68.2 Example 7 72.6 Example 8 71.2 Example 9 88.4 Example 10 68.4 Example 11 93.1 Comparative Example 1 52.7 Comparative Example 2 38.4

[0083] As shown in Tables 1 and 2, the ATPV of Comparative Example 1 (without phosphorus-containing complexing agent) and Comparative Example 2 (without conductive fibers) were only 21.9 and 17.8 cal / cm, respectively. 2 The resistance retention rates were only 52.7% and 38.4%, respectively, indicating poor overall arc resistance and conductivity stability. In Examples 1-8, the ATPV increased to 25.4-27.5 cal / cm² after using a single phosphorus-containing complexing agent. 2 The resistance retention rate increased to 68.2%-74.3%, indicating that various phosphorus-containing complexing agents can bind with Cu. 2+The formation of stable complexes improves the thermal stability and fixation of copper ions in copper-complexed conductive fibers. Furthermore, under the high temperature of an electric arc, phytic acid decomposes to generate phosphoric acid, polyphosphates, and other species, promoting charring on the fiber surface, thereby reducing heat transfer and mitigating damage to the conductive network. In Example 9, phytic acid and ammonium polyphosphate were compounded in a 1:1 mass ratio. Phytic acid provides charring of organophosphorus compounds and polyhydroxy chelation at lower temperatures, while ammonium polyphosphate continues to release polyphosphoric acid and NH3 at higher temperatures. The complementary decomposition temperature ranges and phases of the two compounds significantly increased the ATPV to 32.4 cal / cm³. 2 The resistivity retention rate increased to 88.4%, significantly higher than any single phosphorus-containing complexing agent, demonstrating a synergistic effect. Example 10 used ammonium dihydrogen phosphate and sodium dihydrogen phosphate, both monobasic acid orthophosphates with similar mechanisms of action, but they did not exhibit synergy. Example 11 introduced melamine polyphosphate into phytic acid and ammonium polyphosphate, forming a typical nitrogen-phosphorus intumescent flame-retardant system. At high temperatures, it releases inert gas and generates an intumescent and dense phosphorus-carbon protective layer, more effectively coating the copper complex layer and fiber skeleton, further increasing the ATPV to 36.2 cal / cm². 2 The resistance retention rate was improved to 93.1%, demonstrating further efficiency gains based on synergy.

Claims

1. A method for preparing a high-resistivity arc-resistant suit, characterized in that, The method is as follows: Step 1, Preparation of conductive fibers: Immerse acrylic short fibers in a mixed solution, heat under stirring, remove and wash until neutral and dehydrate to obtain pretreated acrylic short fibers; add the pretreated acrylic short fibers to a copper nitrate dimethylformamide solution, add ethylene glycol and phosphorus-containing complexing agent, stir evenly and heat and keep warm. Triisopropanolamine was then added, and the mixture was treated at a certain temperature. After cooling, the fibers were separated, washed to remove residual copper salts, and dried to obtain conductive fibers. Step 2: Preparation of the surface layer, insulation layer, and comfort layer: The surface layer is made from polyimide fiber, conductive fiber, flame-retardant aramid fiber, and flame-retardant viscose fiber as raw materials, which are spun into double-ply yarns and then woven into a plain weave fabric; the insulation layer is made from polyimide fiber, flame-retardant aramid fiber, and flame-retardant viscose fiber as raw materials, which are web-laid and needle-punched to form a non-woven wadding felt, and then heat-set; the comfort layer is made from a blend of flame-retardant aramid fiber, flame-retardant viscose fiber, and flame-retardant polyester fiber into yarns, which are then woven into a plain weave fabric. Step 3: Preparation of high-resistance arc flash protection clothing: Cut the outer layer, heat insulation layer and comfort layer into pieces respectively, stack them in the order of comfort layer on the inside, heat insulation layer in the middle and outer layer on the outside, sew them together with flame-retardant sewing thread, and add a reinforcing piece of the same material as the outer layer to the shoulder, elbow and knee areas to obtain the high-resistance arc flash protection clothing.

2. The method for preparing the high-resistivity arc-resistant suit as described in claim 1, characterized in that, The method is as follows: Step 1, Preparation of conductive fibers: Immerse acrylic short fibers in a mixed solution, heat to 60-80℃ under stirring, soak for 10-20 minutes, remove, wash with water until neutral and dehydrate to obtain pretreated acrylic short fibers; Pretreated acrylic short fibers were added to a copper nitrate dimethylformamide solution, along with 1-3 wt% ethylene glycol and 2-4 wt% phosphorus-containing complexing agent. After stirring evenly, the solution was heated to 80-95°C and held for 10-50 minutes. Then, 5-12 wt% triisopropanolamine was added to the above mixed solution, and the solution was treated at 40-60°C for 40-80 minutes. After cooling to room temperature, the fibers were separated from the solution and washed repeatedly with water until no obvious copper salt residue remained in the washing liquid. The fibers were then dried with hot air at 50-70°C to obtain conductive fibers. Step 2: Preparation of the surface layer, insulation layer, and comfort layer: For the surface layer, weigh out 50-60 parts by weight of polyimide fiber, 5-15 parts by weight of the conductive fiber prepared in Step 1, 15-25 parts by weight of flame-retardant aramid fiber, and 10-20 parts by weight of flame-retardant viscose fiber. These are then blended and spun into single-strand staple yarns through processes such as opening and cleaning, carding, drawing, roving, and spinning. These yarns are then combined to prepare double-strand yarns, which are used as both warp and weft yarns, resulting in a fabric with a weight of 120-200 g / m². 2 The surface layer is obtained from the woven plain weave fabric; the insulation layer consists of 40-60 parts by weight of polyimide fiber, 15-25 parts by weight of flame-retardant aramid fiber, and 20-40 parts by weight of flame-retardant viscose fiber. After opening and mixing, the fibers are laid on a web forming machine to form a fiber web, which is then reinforced by needle punching to form a unit area mass of 100-150 g / m². 2 The non-woven wadding felt is heat-set to obtain the insulation layer; the yarn used for the comfort layer is a blend of flame-retardant aramid fiber, flame-retardant viscose fiber, and flame-retardant polyester fiber in a mass ratio of 30-50:20-40:20-40. After the three fibers are weighed according to the above ratio, they are processed through opening and cleaning, carding, drawing, roving, and spinning to obtain single-ply staple yarn, which is then plyed into double-ply yarn. This double-ply yarn is then knitted on a knitting machine to produce a weight of 120-180 g / m². 2 Plain knit fabrics provide a comfortable layer; Step 3: Preparation of high-resistance arc flash protection clothing: Cut the outer layer, heat insulation layer and comfort layer obtained in step 2 into corresponding outer layer pieces, heat insulation layer pieces and comfort layer pieces; when sewing, place the comfort layer piece on the inside, the heat insulation layer piece in the middle and the outer layer piece on the outside, and sew them together in sequence using flame-retardant aramid thread. Add a reinforcing piece of the same material as the outer layer at the shoulder, elbow and knee, and the high-resistance arc flash protection clothing is obtained.

3. The method for preparing the high-resistivity arc-resistant suit as described in claim 1 or 2, characterized in that, The solid-liquid ratio of the acrylic short fiber to the mixed solution is 1:10-30 g / mL.

4. The method for preparing the high-resistivity arc-resistant suit as described in claim 1 or 2, characterized in that, The concentration of tartaric acid in the mixed solution is 5-15 g / L, the concentration of acrylic acid is 1-5 g / L, and the concentration of surfactant is 0.5-2 g / L.

5. The method for preparing the high-resistivity arc-resistant suit as described in claim 4, characterized in that, The surfactant is at least one of alkyl polyoxyethylene ether, alkyl glycoside, sodium dodecylbenzenesulfonate, and sodium fatty alcohol polyoxyethylene ether sulfate.

6. The method for preparing the high-resistivity arc-resistant suit as described in claim 1 or 2, characterized in that, The solid-liquid ratio of the pretreated acrylic short fibers to the copper nitrate dimethylformamide solution is 1:10-20 g / mL, and the concentration of the copper nitrate dimethylformamide solution is 0.3-0.8 mol / L.

7. The method for preparing the high-resistivity arc-resistant suit as described in claim 1 or 2, characterized in that, The phosphorus-containing complexing agent is at least one of phytic acid, ammonium polyphosphate, phosphorous acid, hydroxyethylidene diphosphonic acid, ammonium dihydrogen phosphate, sodium dihydrogen phosphate, sodium tripolyphosphate, sodium hexametaphosphate, and melamine polyphosphate.

8. The method for preparing the high-resistivity arc-resistant suit as described in claim 1 or 2, characterized in that, The phosphorus-containing complexing agent is composed of phytic acid and ammonium polyphosphate in a mass ratio of 0.5-2:0.5-2.

9. The method for preparing the high-resistivity arc-resistant suit as described in claim 1 or 2, characterized in that, The phosphorus-containing complexing agent is composed of phytic acid, ammonium polyphosphate, and melamine polyphosphate in a mass ratio of 0.5-2:0.5-2:0.1-0.

3.

10. A high-resistance anti-arc suit, characterized in that, It is prepared by the preparation method described in any one of claims 1-9.