Preparation method of comfortable super high voltage live working fabric

Abstract

The application provides a preparation method of a conductive shielding wave-absorbing composite functional yarn and a method for preparing a comfortable super-high-voltage live working shielding fabric by using the composite functional yarn. The comfortable super-high-voltage live working shielding fabric developed by the application has the advantages of soft cloth surface, stable electrical performance, excellent shielding performance, washing resistance, rubbing resistance, durability, excellent wearing comfort, and the like. The defects of the current live working shielding clothes, such as hard cloth surface, poor wearing comfort, washing resistance, rubbing resistance, unstable electrical performance, poor shielding performance, short service life, and the like, are perfectly solved. The various functional integration designs are realized, and the contradiction between the live working protection performance and the comfort is skillfully relieved.

Description

Technical Field

[0001] This invention belongs to the technical field of functional textile preparation methods, and relates to a method for preparing a conductive shielding and wave-absorbing composite functional yarn. This invention also discloses a method for preparing a comfortable ultra-high voltage live-line work shielding fabric using this self-made composite functional yarn. Background Technology

[0002] After ultra-high voltage (UHV) power transmission projects are put into operation, power outages for maintenance would cause enormous economic losses. Live-line working has become the most common method for maintaining UHV and EHV transmission lines. If workers do not take appropriate safety precautions during live-line work, i.e., do not wear protective suits, the strong electric field near the transmission line and the resulting current and electrostatic induction can cause great harm and impact to the workers, and may even lead to death. Therefore, the protective performance of protective suits for live-line work is crucial to ensuring the personal safety of workers and preventing electric shock accidents.

[0003] Currently, the voltage levels for live-line work shielding suits developed in my country are mainly applicable to AC 110(66)kV~750kV, 1000kV, DC ±800kV, and ±1000kV.

[0004] CN213428448U designs a protective suit for live-line work. The main body of the protective suit consists of a base layer, a conductive layer, and a wear-resistant layer. The above three layers are respectively composed of a silk layer, a degreased wool layer, a stainless steel fiber layer, a Monel alloy wire layer, a polypropylene fiber layer, and a polyamide fiber layer. The final protective suit body is composed of 6 layers of fabric bonded together with hot melt adhesive. The laminated fabric of this structure is stiff, which affects the flexibility of the operator's movements. At the same time, the use of hot melt adhesive bonding results in insufficient breathability, which can easily cause a stuffy feeling and poor wearing comfort, thus affecting the work efficiency of the operator.

[0005] Jiang Shuyuan et al. developed summer, spring and autumn, and winter shielding silk by blending bleached tussah silk with stainless steel metal fibers. After testing and verification, the electrical and wearability performance of the shielding silk met the standard requirements and has been used for a long time in live-line work at 500kV and below.

[0006] CN209643924U discloses a live-line working shielding suit and its fabric. The fabric uses stainless steel microfilaments, copper microfilaments, aramid fibers, and flame-retardant viscose as raw materials. The spun yarns are designed with a fabric structure to form three different square shielding areas that serve different functions. The fabric has a fusing current ≥9A, a fabric resistance <50mΩ, and an electromagnetic shielding value ≥70dB, meeting the protection requirements for personnel working on 1000kV and above power lines.

[0007] Regarding the shielding suit for live-line work at DC ±1100kV voltage level, the only available invention patent CN201810411246.6 discloses a shielding suit for ±1100kV live-line work. The metal wire cloth used in the shielding suit is made of stainless steel fiber + tussah silk + cotton + metal microfilaments spun in a certain proportion and twisted into yarn before being woven. It can meet the safety requirements for workers to perform live-line work under normal power transmission conditions of ±1100kV transmission circuits.

[0008] Based on the above analysis, the main technical solutions for the preparation of shielding suit fabrics for live-line work are currently film lamination and stainless steel fiber blending.

[0009] The protective suit for live-line work developed using laminated fabric has a stiff fabric surface, which affects the flexibility of the operator's movements. At the same time, the use of hot melt adhesive bonding results in insufficient breathability, which can easily cause a stuffy feeling and poor wearing comfort, thus affecting the operator's work efficiency.

[0010] The main technical drawbacks of protective clothing fabrics for live-line work, developed using blends of stainless steel fibers or copper microfilaments, are:

[0011] Firstly, after washing or wearing stainless steel or metal fibers, the stainless steel fibers are prone to "agglomeration," resulting in uneven distribution on the fabric surface and weak "protective" areas. At the same time, the stainless steel metal fiber structure is damaged, leading to a significant decrease in electrical and mechanical properties.

[0012] Secondly, the shielding suits for live-line work made of stainless steel fibers are subject to challenges. Due to the high rigidity of stainless steel fibers, they are prone to breakage during the spinning process. In addition, the cohesion between metal fibers is small, making spinning difficult. As a result, the content of stainless steel fibers in the yarn cannot be too high, making it difficult to further improve the shielding performance of the fabric. At the same time, stainless steel fibers are austenitic, which conducts electricity but does not conduct magnetism. Their shielding of electromagnetic waves is mainly based on reflection. Once the content of stainless steel fibers is increased to a certain threshold, it is difficult to further improve the shielding performance of the fabric.

[0013] Third, the main components of stainless steel fiber are iron, chromium, nickel, manganese, molybdenum and small amounts of carbon, sulfur, silicon, etc. Its conductivity is not as good as that of copper and silver, which limits the further improvement of the electrical performance of shielding suits, especially since the resistance of this type of shielding suit is relatively large.

[0014] Fourth, the standard GB / T 25726-2010 specifies the abrasion resistance requirements for shielding suit fabrics used in 1000kV live-line work: after 500 cycles of friction with a 150-grain silicon carbide grinding wheel, the resistance should not exceed 1Ω, and the shielding efficiency should be greater than 60dB. However, the stainless steel fiber strands used have fiber lengths between 51mm and 63mm. Due to the high rigidity of stainless steel fibers, some metal fibers break and fall off after 500 cycles of friction, making it difficult for the fabric's resistance and shielding effectiveness to meet the above standard requirements.

[0015] Fifth, shielding fabrics developed from copper-based metal microfilaments are easily oxidized in humid and hot environments, resulting in unstable performance. Meanwhile, stainless steel fibers or metal microfilaments can cause itching or skin allergies when in direct contact with human skin, and their comfort needs to be improved.

[0016] In summary, current shielding fabrics for live-line work still have shortcomings such as stiff fabric surface, poor wearing comfort, poor washability, poor abrasion resistance, lack of durability, unstable electrical performance, and the need to improve shielding performance. Summary of the Invention

[0017] To address the shortcomings of the prior art, the present invention aims to provide a conductive shielding and wave-absorbing composite functional yarn, a comfortable ultra-high voltage live-line working shielding fabric developed using the yarn, and a method for preparing the yarn and fabric.

[0018] To develop a comfortable shielding fabric for ultra-high voltage live-line work, this invention provides a method for preparing a conductive shielding and wave-absorbing composite functional yarn, which is implemented according to the following steps:

[0019] Step 1, plying: Using a plying machine, the high-temperature resistant flame-retardant filament and the M400 metal filament are unwound and then combined into parallel double-strand untwisted filaments;

[0020] Step 2, Pretreatment: Use organic solvents to remove oil or other contaminants from the surface of the bi-strand untwisted filaments to obtain bi-strand untwisted filaments with high cleanliness.

[0021] Step 3, Surface activation: The pre-treated double-strand untwisted filaments after degreasing are continuously passed through a mixed acid solution of a certain concentration to perform etching and activation treatment on the surface of the double-strand untwisted filaments.

[0022] Step 4, Pre-coating treatment: The activated double-strand untwisted filaments are passed through a conductive shielding and absorbing liquid at a certain speed to complete the pre-coating treatment.

[0023] Step 5, Radiation Crosslinking and Baking: The pre-coated double-strand untwisted filaments are passed sequentially through a twisting device, a gamma-ray source radiation device, and a drying device at a certain speed to complete the radiation crosslinking and baking process.

[0024] Step 6, Twisting: The treated double-strand untwisted filaments are twisted using a doubling twister to obtain a conductive, shielding, and wave-absorbing composite yarn.

[0025] The substrate of the high-temperature resistant and flame-retardant filament mentioned in step 1 is one of para-aramid filament and polyimide filament.

[0026] The pretreatment organic solvent mentioned in step 2 is one or a mixture of acetone, ethanol, and toluene, the treatment temperature is 30°C, and the treatment speed is 20 m / min.

[0027] The mixed acid solution mentioned in step 3 is a mixture of a 5% to 10% hydrochloric acid solution and a 10% to 25% sulfuric acid solution, with a mixing ratio of 2:5. The etching activation treatment temperature is 15 to 25°C, and the etching activation treatment time is 25 to 50 seconds.

[0028] The conductive shielding and absorbing mixture mentioned in step 4 is composed of conductive shielding and absorbing nanoparticles, dispersant, binder and solvent.

[0029] The conductive shielding and absorbing mixture mentioned in step 4 is prepared by placing conductive shielding and absorbing nanoparticles, dispersant, binder and solvent in a reaction vessel, and stirring with a magnetic stirrer at a temperature of 30℃~50℃ and a speed of 300 rpm~500 rpm.

[0030] In the conductive shielding and absorbing mixture described in step 4, the conductive shielding and absorbing nanoparticles account for 40% to 50%, the binder accounts for 5% to 10%, the dispersant accounts for 5% to 10%, and the remainder is solvent. The total mass fraction of the above components is 100%; the thickness of the coating is 0.8 to 1.2 μm.

[0031] In step 4, the conductive shielding and absorbing nanopowder contains 45%–55% silver, 25%–35% copper, 4%–10% MXene, 2%–8% cobalt, 2%–5% ferrite, 1.5%–4% manganese, and 0.5%–3% carbon nanotubes, with the total mass fraction of all the above components being 100%.

[0032] The adhesive described in step 4 includes one or more mixtures of flame-retardant unsaturated 191 resin, high-temperature resistant vinyl resin, and polyacrylate.

[0033] The solvent mentioned in step 4 includes one or more mixtures of dimethyl carbonate (DMC), dimethyl sulfoxide (DMSO), ethyl acetate (EAC), N,N-dimethylformamide (DMF), and N-methyl-2-pyrrolidone (NMP).

[0034] The radiation source used for radiation crosslinking in step 5 is gamma rays, with an irradiation dose of 50–200 kGy and an irradiation environment of oxygen-free nitrogen atmosphere.

[0035] The twist of the double-strand untwisted filaments described in step 6 is 100-400 twists / meter, and the twist direction is S-twist.

[0036] The second aspect of the present invention is a method for preparing a comfortable ultra-high voltage live-line working shielding fabric using the conductive shielding and absorbing composite functional yarn prepared above, the specific steps of which are as follows:

[0037] Step 1, spinning: The fabric is made of interwoven warp and weft yarns. The outer layer of warp and weft yarns is the above-mentioned conductive shielding and wave-absorbing composite yarn, and the inner layer of warp and weft yarns is a double-ply yarn blended with flame-retardant viscose, meta-aramid, and far-infrared carbon nanotube polyester.

[0038] Step 2, weaving: The yarn produced in Step 1 is sequentially warped, sizing, threaded onto a reed, woven, and finished to obtain the greige fabric;

[0039] Step 3, finishing: The fabric obtained in Step 2 is desized, stretched and set, pre-shrinked and rolled in sequence to form a comfortable ultra-high voltage live-line shielding fabric.

[0040] The linear density of the self-made conductive shielding and wave-absorbing composite functional yarn used in the outer layer mentioned in step 1 is 28.12 tex to 33.74 tex.

[0041] The linear density of the blended yarn used in the inner layer mentioned in step 1 is 9.84×2~11.81×2tex.

[0042] In the blended yarn used for the inner layer in step 1, the content of flame-retardant viscose fiber is 40% to 50%, the content of meta-aramid is 35% to 40%, and the content of far-infrared carbon nanotube polyester is 10% to 25%.

[0043] The fabric structure described in step 2 is formed by interlacing two types of warp and weft yarns, outer and inner, through the interlacing of the outer weft and inner warp.

[0044] The outer fabric structure described in step 2 is plain weave or crepe weave, and the inner fabric structure is mesh weave or twill weave.

[0045] The ratio of the inner and outer yarns in step 2 is 1:1.

[0046] The fabric described in step 2 has a warp density of 535-550 threads / 10cm and a weft density of 453-465 threads / 10cm.

[0047] The fabric mass per unit area mentioned in step 3 is 260-300 g / m². 2 The ratio of the unit area mass of the inner and outer layers of fabric is 3:2.

[0048] Compared with the prior art, the present invention has the following advantages:

[0049] This invention discloses a comfortable double-layered shielding fabric for ultra-high voltage live-line work. The outer layer is a plain weave or crepe weave with short floats, multiple interlacings, and a tight structure with few gaps. Utilizing the diffuse reflection effect of the uneven surfaces formed by the interlacing points, it enhances the multiple refractions and reflections of electromagnetic waves, improving the fabric's electrical properties, abrasion resistance, and shielding performance. The inner layer is a twill weave or perforated weave, with a soft and smooth feel, close to the skin, and good breathability, resulting in excellent wearing comfort. The inner and outer layers are joined by the interlacing of the outer warp and inner weft to form a double-layered fabric with dual functions. Each layer performs its specific function, working synergistically. The outer layer provides conductivity and shielding, while the inner layer, in direct contact with the skin, provides wearing comfort. The fabric as a whole combines high performance and comfort.

[0050] The flame-retardant metal-plated filaments used in the outer layer of the two-dimensional fabric of this invention are made of polyimide, which can withstand temperatures above 400°C, and para-aramid, which can withstand temperatures above 560°C, thus ensuring the flame-retardant performance and melting current of the shielding fabric.

[0051] The conductive shielding and microwave-absorbing composite functional yarn used in the outer layer of the fabric prepared by this invention employs a simple and convenient irradiation cross-linking method to fix micro-nano materials on the surface. These materials are composed of various conductive powders and microwave-absorbing materials, achieving synergistic cooperation between different conductive and microwave-absorbing shielding micro-nano powders. This results in component synergy, mechanism linkage, and functional integration, achieving a synergistic effect greater than the sum of its parts (1+1>2). Its conductivity, microwave-absorbing shielding performance, and oxidation resistance are all significantly improved. For example, the addition of manganese solves the problem of conductivity attenuation caused by the chemically active and easily oxidized properties of copper and silver powders. The compounding technology of copper, iron, manganese, and carbon alleviates the electromigration phenomenon of silver in humid environments, ensuring the integrity of the silver coating structure. Simultaneously, the addition of highly efficient microwave-absorbing materials MXene, cobalt, and ferrite achieves dual weakening of electromagnetic wave absorption and reflection, overcoming the shortcomings of using stainless steel metal fibers alone in terms of poor electromagnetic shielding performance in the low-frequency band.

[0052] In preparing the conductive shielding and microwave absorbing composite functional yarn, this invention first combines high-temperature resistant flame-retardant filaments with M400 metal filaments to form a double-strand untwisted filament. Then, it undergoes pretreatment, surface activation, pre-coating, radiation crosslinking and baking, and twisting processes. In one process, the high-temperature flame-retardant filament and the M400 metal filament are simultaneously coated and crosslinked. Finally, the double-strand untwisted filament after coating and crosslinking is twisted, so that the high-temperature resistant flame-retardant filament and the M400 metal filament are spirally wound, and the two are tightly bonded. The conductive materials are fully in contact and conduction, and the entire yarn structure is compact and stable, with strong conductivity, low resistance, and excellent shielding performance. At the same time, it perfectly solves the defect of poor abrasion resistance of fabrics.

[0053] This invention employs a coating radiation crosslinking technology to manufacture conductive shielding and microwave absorbing composite functional yarns. The advantages of this technology are: it requires no initiator, is simple to operate, and has low dependence on crosslinking temperature. When high-energy gamma rays act on the yarn impregnated with a conductive shielding and microwave absorbing mixture, the polymer molecular chains in the mixture carried by the yarn lose hydrogen atoms under the influence of the high-energy rays, generating various free radicals. These free radicals from adjacent polymers couple to form thousands of crosslinking bonds, which in turn form covalent bonds with other molecular chains, causing the polymer chain length to continuously increase, ultimately forming a three-dimensional network structure. This network structure "locks" the conductive shielding and microwave absorbing nanoparticles onto the surface of the filament matrix. The solvent contained within evaporates fully during the subsequent baking process, allowing more conductive shielding and microwave absorbing nanoparticles to densely arrange on the matrix surface. From a macroscopic perspective, a dense conductive shielding and microwave absorbing film is formed on the surface of the high-temperature resistant flame-retardant filament and the M400 metal filament. This technical solution endows high-temperature flame-retardant filaments with conductive and wave-absorbing shielding functions; it improves the conductive and wave-absorbing shielding performance of M400 metal filaments, making up for the shortcomings of existing filaments that do not have wave-absorbing properties and have poor conductivity.

[0054] The conductive shielding and absorbing composite functional yarn of this invention has a conductive absorbing shielding layer with a thickness of 0.8 to 1.2 μm formed by radiation cross-linking on the yarn surface. According to the skin effect and the measured data of the fabric made using the technical solution of this invention, the conductive absorbing shielding layer of this thickness is sufficient to ensure the conductivity and shielding performance of the shielding fabric. The optimal thickness of the conductive absorbing shielding layer helps to reduce development costs and the quality of the entire equipment, and is more conducive to improving the work efficiency of operators.

[0055] The inner layer of the fabric prepared in this invention uses far-infrared carbon nanotube polyester, whose far-infrared radiation has the effect of activating cell tissue and promoting blood circulation. The flame-retardant adhesive mixed with it has excellent moisture absorption capacity, which quickly absorbs sweat and allows sweat to spread instantly, avoiding discomfort caused by local sweat condensation.

[0056] As can be seen, the comfortable ultra-high voltage live-line work shielding fabric developed using this invention has a soft surface, stable electrical performance, excellent shielding performance, is washable, abrasion-resistant, sturdy and durable, and offers excellent wearing comfort. It perfectly solves the defects of current live-line work shielding suits, such as stiff fabric, poor wearing comfort, poor washability, poor abrasion resistance, unstable electrical performance, insufficient shielding performance, and lack of durability. It achieves integrated design of various functions, cleverly alleviating the contradiction between protective performance and comfort in live-line work. Using this shielding fabric, comfortable ultra-high voltage live-line work suits suitable for voltage levels of ±1100kV can be developed, providing protection for workers. Attached Figure Description

[0057] Figure 1This is a diagram of the fabric structure of a comfortable ultra-high voltage live-line working shielding fabric according to the present invention.

[0058] Explanation of the markings in the attached diagram: "■" indicates the surface warp float; "○" indicates the surface warp is raised when the inner weft is woven in; "×" indicates the inner warp is raised when the inner weft is woven in; "▲" indicates the junction point. Detailed Implementation

[0059] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0060] Example 1:

[0061] A method for preparing a conductive shielding and microwave absorbing composite functional yarn is implemented according to the following steps:

[0062] Step 1, plying: Using a plying machine, the high-temperature resistant flame-retardant filament and the M400 metal filament are unwound and then combined into parallel double-strand untwisted filaments;

[0063] Step 2, Pretreatment: Use organic solvents to remove oil or other contaminants from the surface of the bi-strand untwisted filaments to obtain bi-strand untwisted filaments with high cleanliness.

[0064] Step 3, Surface activation: The pre-treated double-strand untwisted filaments after degreasing are continuously passed through a mixed acid solution of a certain concentration to perform etching and activation treatment on the surface of the double-strand untwisted filaments.

[0065] Step 4, Pre-coating treatment: The activated double-strand untwisted filaments are passed through a conductive shielding and absorbing liquid at a certain speed to complete the pre-coating treatment.

[0066] Step 5, Radiation Crosslinking and Baking: The pre-coated double-strand untwisted filaments are passed sequentially through a twisting device, a gamma-ray source radiation device, and a drying device at a certain speed to complete the radiation crosslinking and baking process.

[0067] Step 6, Twisting: The treated double-strand untwisted filaments are twisted using a doubling twister to obtain a conductive, shielding, and wave-absorbing composite yarn.

[0068] The substrate of the high-temperature resistant and flame-retardant filament mentioned in step 1 is polyimide filament.

[0069] The pretreatment organic solvent mentioned in step 2 is acetone, the treatment temperature is 30℃, and the treatment speed is 20 m / min.

[0070] The mixed acid solution mentioned in step 3 is composed of an 8% hydrochloric acid solution and a 20% sulfuric acid solution, with a mixing ratio of 2:5. The etching activation treatment temperature is 20°C and the etching activation treatment time is 40 seconds.

[0071] The conductive shielding and absorbing mixture mentioned in step 4 is composed of conductive shielding and absorbing nanoparticles, dispersant, binder and solvent.

[0072] The conductive shielding and absorbing mixture mentioned in step 4 is prepared by placing conductive shielding and absorbing nanoparticles, dispersant, binder and solvent in a reaction vessel, and stirring with a magnetic stirrer at a temperature of 40°C and a speed of 400 rpm.

[0073] In the conductive shielding and absorbing mixture described in step 4, the conductive shielding and absorbing nanoparticles account for 40%, the binder for 10%, the dispersant for 5%, and the remainder is solvent. The total mass fraction of all the above components is 100%. The coating thickness is 1 μm.

[0074] The conductive shielding and absorbing nanopowder described in step 4 contains 45% silver, 30% copper, 10% MXene, 6% cobalt, 4% ferrite, 3% manganese, and 2% carbon nanotubes.

[0075] The adhesive mentioned in step 4 is a high-temperature resistant vinyl resin.

[0076] The solvent mentioned in step 4 is N,N-dimethylformamide (DMF).

[0077] The radiation source used for radiation crosslinking in step 5 is gamma rays, the irradiation dose is 150 kGy, and the irradiation environment is an oxygen-free nitrogen atmosphere.

[0078] The twist of the double-strand untwisted filament described in step 6 is 200 twists / meter, and the twist direction is S twist.

[0079] Example 2:

[0080] A method for preparing a conductive shielding and microwave absorbing composite functional yarn is implemented according to the following steps:

[0081] Step 1, plying: Using a plying machine, the high-temperature resistant flame-retardant filament and the M400 metal filament are unwound and then combined into parallel double-strand untwisted filaments;

[0082] Step 2, Pretreatment: Use organic solvents to remove oil or other contaminants from the surface of the bi-strand untwisted filaments to obtain bi-strand untwisted filaments with high cleanliness.

[0083] Step 3, Surface activation: The pre-treated double-strand untwisted filaments after degreasing are continuously passed through a mixed acid solution of a certain concentration to perform etching and activation treatment on the surface of the double-strand untwisted filaments.

[0084] Step 4, Pre-coating treatment: The activated double-strand untwisted filaments are passed through a conductive shielding and absorbing liquid at a certain speed to complete the pre-coating treatment.

[0085] Step 5, Radiation Crosslinking and Baking: The pre-coated double-strand untwisted filaments are passed sequentially through a twisting device, a gamma-ray source radiation device, and a drying and heating device at a certain speed to complete the radiation crosslinking and baking process.

[0086] Step 6, Twisting: The treated double-strand untwisted filaments are twisted using a doubling twister to obtain a conductive, shielding, and wave-absorbing composite yarn.

[0087] The substrate of the high-temperature resistant and flame-retardant filament mentioned in step 1 is one of para-aramid filament and polyimide filament.

[0088] The pretreatment organic solvent mentioned in step 2 is ethanol, the treatment temperature is 30℃, and the treatment speed is 20 m / min.

[0089] The mixed acid solution mentioned in step 3 is composed of an 8% hydrochloric acid solution and a 15% sulfuric acid solution, with a mixing ratio of 2:5. The etching activation treatment temperature is 25°C and the etching activation treatment time is 30 seconds.

[0090] The conductive shielding and absorbing mixture mentioned in step 4 is composed of conductive shielding and absorbing nanoparticles, dispersant, binder and solvent.

[0091] The conductive shielding and absorbing mixture mentioned in step 4 is prepared by placing conductive shielding and absorbing nanoparticles, dispersant, binder and solvent in a reaction vessel, and stirring with a magnetic stirrer at a temperature of 50°C and a speed of 500 rpm.

[0092] In the conductive shielding and absorbing mixture described in step 4, the conductive shielding and absorbing nanoparticles account for 50%, the binder for 8%, the dispersant for 10%, and the remainder is solvent. The total mass fraction of all the above components is 100%. The coating thickness is 1.2 μm.

[0093] The conductive shielding and absorbing nanopowder described in step 4 contains 55% silver, 25% copper, 8% MXene, 3% cobalt, 4% ferrite, 2% manganese, and 3% carbon nanotubes.

[0094] The adhesive mentioned in step 4 is flame-retardant unsaturated 191 resin.

[0095] The solvent mentioned in step 4 is dimethyl sulfoxide (DMSO).

[0096] The radiation source used for radiation crosslinking in step 5 is gamma rays, the irradiation dose is 200 kGy, and the irradiation environment is an oxygen-free nitrogen atmosphere.

[0097] The twist of the double-strand untwisted filament described in step 6 is 400 twists / meter, and the twist direction is S twist.

[0098] Example 3:

[0099] The method for preparing a comfortable ultra-high voltage live-line working shielding fabric using the conductive shielding and absorbing composite functional yarn prepared in Example 1 is as follows:

[0100] Step 1, spinning: The fabric is woven from warp and weft yarns. The outer layer of warp and weft yarns is the conductive shielding and wave-absorbing composite functional yarn prepared in Example 1, and the inner layer of warp and weft yarns is a double-ply yarn blended with flame-retardant viscose, meta-aramid, and far-infrared carbon nanotube polyester.

[0101] Step 2, weaving: The yarn produced in Step 1 is sequentially warped, sizing, threaded onto a reed, woven, and finished to obtain the greige fabric;

[0102] Step 3, finishing: The fabric obtained in Step 2 is desized, stretched and set, pre-shrinked and rolled in sequence to form a comfortable ultra-high voltage live-line shielding fabric.

[0103] The linear density of the self-made conductive shielding and wave-absorbing composite functional yarn used in the outer layer mentioned in step 1 is 31.68 tex.

[0104] The linear density of the blended yarn used in the inner layer mentioned in step 1 is 10.23 × 2 tex.

[0105] In the blended yarn used for the inner layer in step 1, the content of flame-retardant viscose fiber is 40%, the content of meta-aramid is 40%, and the content of far-infrared carbon nanotube polyester is 20%.

[0106] The fabric structure described in step 2 is formed by interlacing two types of warp and weft yarns, outer and inner, through the interlacing of the outer weft and inner warp.

[0107] The outer fabric structure described in step 2 is plain weave or crepe weave, and the inner fabric structure is mesh weave or twill weave.

[0108] The ratio of the inner and outer yarns in step 2 is 1:1.

[0109] The fabric described in step 2 has a warp density of 550 threads / 10cm and a weft density of 465 threads / 10cm.

[0110] The fabric mass per unit area mentioned in step 3 is 290 g / m². 2 The ratio of the unit area mass of the inner and outer layers of fabric is 3:2.

[0111] Example 4:

[0112] The method for preparing comfortable ultra-high voltage live-line working shielding fabric using the conductive shielding and absorbing composite functional yarn prepared in Example 2 is as follows:

[0113] Step 1, spinning: The fabric is woven from warp and weft yarns. The outer layer of warp and weft yarns is the conductive shielding and wave-absorbing composite functional yarn prepared in Example 2, and the inner layer of warp and weft yarns is a double-ply yarn blended with flame-retardant viscose, meta-aramid, and far-infrared carbon nanotube polyester.

[0114] Step 2, weaving: The yarn produced in Step 1 is sequentially warped, sizing, threaded onto a reed, woven, and finished to obtain the greige fabric;

[0115] Step 3, finishing: The fabric obtained in Step 2 is desized, stretched and set, pre-shrinked and rolled in sequence to form a comfortable ultra-high voltage live-line shielding fabric.

[0116] The linear density of the self-made conductive shielding and wave-absorbing composite functional yarn used in the outer layer mentioned in step 1 is 33.74 tex.

[0117] The linear density of the blended yarn used in the inner layer mentioned in step 1 is 11.81 × 2 tex.

[0118] In the blended yarn used for the inner layer in step 1, the content of flame-retardant viscose fiber is 45%, the content of meta-aramid is 40%, and the content of far-infrared carbon nanotube polyester is 15%.

[0119] The fabric structure described in step 2 is formed by interlacing two types of warp and weft yarns, outer and inner, through the interlacing of the outer weft and inner warp.

[0120] The outer fabric structure described in step 2 is plain weave or crepe weave, and the inner fabric structure is mesh weave or twill weave.

[0121] The ratio of the inner and outer yarns in step 2 is 1:1.

[0122] The fabric described in step 2 has a warp density of 535 threads / 10cm and a weft density of 453 threads / 10cm.

[0123] The fabric mass per unit area mentioned in step 3 is 270 g / m². 2 The ratio of the unit area mass of the inner and outer layers of fabric is 3:2.

[0124] To verify the performance of the fabric developed in this invention, the two fabrics prepared in Examples 3-4 were tested according to the requirements of GB / T 25726-2010. The test results are shown in Table 1.

[0125]

[0126] Principles and steps not explicitly described in this invention are all obtainable by those skilled in the art through conventional technical means, and therefore will not be elaborated upon. Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A method for preparing a conductive shielding and microwave absorbing composite functional yarn, characterized in that: The specific steps are as follows: Step 1, plying: Using a plying machine, the high-temperature resistant flame-retardant filament and the M400 metal filament are unwound and then combined into parallel double-strand untwisted filaments; Step 2, Pretreatment: Use organic solvents to remove oil or other contaminants from the surface of the bi-strand untwisted filaments to obtain bi-strand untwisted filaments with high cleanliness; Step 3, Surface activation: The pre-treated double-strand untwisted filaments after degreasing are continuously passed through a mixed acid solution of a certain concentration to perform etching activation treatment on the surface of the double-strand untwisted filaments. Step 4, Pre-coating treatment: The activated double-strand untwisted filaments are passed through a conductive shielding and absorbing liquid at a certain speed to complete the pre-coating treatment; Step 5, Radiation crosslinking and baking: The pre-coated double-strand untwisted filaments are passed sequentially through a twisting device, a gamma-ray source radiation device, and a drying and heating device at a certain speed to complete the radiation crosslinking and baking process; Step 6, Twisting: The treated double-strand untwisted filaments are twisted using a doubling twister to obtain a conductive, shielding, and wave-absorbing composite yarn. In the conductive shielding and absorbing mixture described in step 4, the conductive shielding and absorbing nanoparticles account for 40% to 50%, the binder for 5% to 10%, the dispersant for 5% to 10%, and the remainder is solvent. The total mass fraction of all the above components is 100%. In step 4, the conductive shielding and absorbing nanopowder contains 45% to 55% silver, 25% to 35% copper, 4% to 10% MXene, 2% to 8% cobalt, 2% to 5% ferrite, 1.5% to 4% manganese, and 0.5% to 3% carbon nanotubes, with the total mass fraction of all the above components being 100%.

2. The method for preparing a conductive shielding and wave-absorbing composite functional yarn according to claim 1, wherein the substrate of the high-temperature resistant and flame-retardant filament in step 1 is one of para-aramid filament and polyimide filament; The pretreatment organic solvent mentioned in step 2 is one or a mixture of acetone, ethanol, and toluene, the treatment temperature is 30°C, and the treatment speed is 20 m / min; The mixed acid solution mentioned in step 3 is a mixture of a 5% to 10% hydrochloric acid solution and a 10% to 25% sulfuric acid solution, with a mixing ratio of 2:

5. The etching activation treatment temperature is 15 to 25°C, and the etching activation treatment time is 25 to 50 seconds.

3. The method for preparing a conductive shielding and microwave absorbing composite functional yarn according to claim 1, wherein the conductive shielding and microwave absorbing mixture in step 4 is prepared by placing conductive shielding and microwave absorbing nanopowder, dispersant, binder and solvent in a reaction vessel, and stirring with a magnetic stirrer at a temperature of 30℃~50℃ and a speed of 300 rpm~500 rpm. In step 4, the coating thickness is 0.8 ~ 1.2 μm; The adhesive mentioned in step 4 includes one or more mixtures of flame-retardant unsaturated 191 resin, high-temperature resistant vinyl resin, and polyacrylate; The solvents described in step 4 include one or more mixtures of dimethyl carbonate (DMC), dimethyl sulfoxide (DMSO), ethyl acetate (EAC), N,N-dimethylformamide (DMF), and N-methyl-2-pyrrolidone (NMP).

4. In the method for preparing a conductive shielding and microwave absorbing composite functional yarn according to claim 1, the radiation source used for radiation crosslinking in step 5 is gamma rays, the irradiation dose is 50-200 KGy, and the irradiation environment is an oxygen-free nitrogen atmosphere.

5. In the method for preparing a conductive shielding and wave-absorbing composite functional yarn according to claim 1, the twist of the double-strand untwisted filament in step 6 is 100-400 twists / meter, and the twist direction is S-twist.

6. A method for preparing a comfortable ultra-high voltage live-line working shielding fabric using conductive shielding and microwave-absorbing composite functional yarn prepared by any one of claims 1-5, characterized in that, The specific steps are as follows: Step 1, spinning: The fabric is made of interwoven warp and weft yarns. The outer layer of warp and weft yarns is the above-mentioned conductive shielding and wave-absorbing composite yarn, and the inner layer of warp and weft yarns is a double single-ply yarn blended with flame-retardant viscose, meta-aramid, and far-infrared carbon nanotube polyester. Step 2, weaving: The yarn produced in Step 1 is sequentially warped, sizing, threaded onto a reed, woven, and finished to obtain the greige fabric; Step 3, finishing: The fabric obtained in Step 2 is desized, stretched and set, pre-shrinked and rolled in sequence to form a comfortable ultra-high voltage live-line shielding fabric.

7. The method for preparing a comfortable ultra-high voltage live-line working shielding fabric according to claim 6, wherein the linear density of the self-made conductive shielding and wave-absorbing composite functional yarn used in the outer layer in step 1 is 28.12 tex to 33.74 tex; The linear density of the blended yarn used in the inner layer mentioned in step 1 is 9.84×2~11.81×2tex; In the blended yarn used for the inner layer described in step 1, the content of flame-retardant viscose fiber is 40% to 50%, the content of meta-aramid is 35% to 40%, and the content of far-infrared carbon nanotube polyester is 10% to 25%.

8. The method for preparing a comfortable ultra-high voltage live-line working shielding fabric according to claim 6, wherein the fabric structure in step 2 is formed by interlacing two types of warp and weft yarns, an outer layer and an inner layer, through the interlacing of the outer weft and the inner warp; The outer fabric structure described in step 2 is plain weave or crepe weave, and the inner fabric structure is mesh weave or twill weave. The ratio of the inner to outer yarns in step 2 is 1:1; The fabric described in step 2 has a warp density of 535-550 threads / 10cm and a weft density of 453-465 threads / 10cm.

9. The method for preparing a comfortable ultra-high voltage live-line working shielding fabric according to claim 6, wherein the fabric in step 3 has a unit area mass of 260-300 g / m². 2 The ratio of the unit area mass of the inner and outer layers of fabric is 3:2.

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