Flame-retardant, high-temperature resistant, corrosion-resistant, conductive fibers, fabrics, and manufacturing processes

Abstract

This application relates to the field of textile technology, specifically disclosing a flame-retardant, high-temperature resistant, corrosion-resistant conductive fiber, fabric, and manufacturing process. The flame-retardant, high-temperature resistant, corrosion-resistant conductive fiber of this application exhibits excellent conductivity, fully overcoming the high resistivity defect of polyphenylene sulfide (PPS), while retaining the advantages of PPS such as high temperature resistance, flame retardancy, and corrosion resistance. It is suitable for manufacturing special protective clothing and gear for use in gas leak and chemical accident rescue operations.

Description

Technical Field

[0001] This application relates to the field of textile technology, and more specifically, to a flame-retardant, high-temperature resistant, corrosion-resistant, conductive fiber, fabric, and manufacturing process. Background Technology

[0002] With the acceleration of urbanization and the development of the textile industry, the variety of textiles is increasing, their applications are expanding, and people's demands for the performance and functionality of textiles are also rising. However, most textile materials have weak flame retardancy and cannot provide sufficient protection in fire scenes, battlefields, factories, and other similar situations. According to relevant surveys, fires caused by textiles account for more than half of all fire accidents. Therefore, endowing textiles with good flame retardancy and heat resistance can reduce or eliminate fire hazards and help protect people's lives and property. In addition, textiles with heat-resistant and flame-retardant properties can also be used to produce special clothing such as fire suits, industrial protective clothing, and battlefield combat uniforms, which can effectively increase the added value of textile products.

[0003] The upstream product of textiles is fiber. Currently, the most widely used flame-retardant and high-temperature resistant fibers are various fibers containing benzene rings, such as aramid fibers and polyphenylene sulfide fibers. Aramid fibers and polyphenylene sulfide fibers contain a large number of benzene rings, thus possessing excellent high-temperature resistance, flame retardancy, and corrosion resistance. In addition, they also have good mechanical properties. Textiles made from aramid fibers and polyphenylene sulfide fibers can effectively resist various damages such as scratches and abrasions, exhibiting strong durability and promising development prospects.

[0004] Regarding the aforementioned technologies, the inventors believe that although polyphenylene sulfide fibers in these technologies have ideal flame retardant, high temperature resistance, and corrosion resistance, they have poor antistatic properties due to their high electrical resistance. In practical applications, they are prone to accumulating static electricity and generating electric sparks, making them unsuitable for use in situations such as gas leaks and chemical accident rescues. Summary of the Invention

[0005] In related technologies, polyphenylene sulfide fibers have poor antistatic properties, and are prone to accumulating static electricity and generating electric sparks during practical applications, making them unsuitable for use in situations such as gas leaks and chemical accident rescues. To improve this deficiency, this application provides a flame-retardant, high-temperature resistant, corrosion-resistant conductive fiber, fabric, and manufacturing process.

[0006] In a first aspect, this application provides a flame-retardant, high-temperature resistant, and corrosion-resistant conductive fiber, employing the following technical solution:

[0007] A flame-retardant, high-temperature resistant, and corrosion-resistant conductive fiber is disclosed. The conductive fiber is obtained by doping a matrix fiber with ammonium persulfate. The matrix fiber comprises the following raw material components in parts by weight: 75-85 parts of linear polyphenylene sulfide, 13-15 parts of modified polyphenylene sulfide, 6-8 parts of conductive additives, 0.8-1.2 parts of coupling agent, 0.3-0.6 parts of antioxidant, and 0.5-0.7 parts of processing aids. The modified polyphenylene sulfide is a graft of multi-walled carbon nanotubes and linear polyphenylene sulfide. The conductive additives include silver-loaded zinc oxide nanocrystals and at least one carbon-based filler.

[0008] By adopting the above technical solution, this application grafts multi-walled carbon nanotubes onto linear polyphenylene sulfide (PPS) to obtain modified PPS. Then, modified PPS is added to the linear PPS base, and silver-loaded zinc oxide nanowhiskers and at least one carbon-based filler are preferred as conductive additives. The modified PPS exhibits good compatibility with linear PPS and can be uniformly dispersed in conductive fibers with linear PPS as the main component, thereby achieving uniform dispersion of multi-walled carbon nanotubes. The silver-loaded zinc oxide nanowhiskers in the conductive filler have a certain aspect ratio, which is beneficial for current conduction, and the silver further improves the current conduction effect on top of the zinc oxide. The carbon-based filler in the conductive additive can fill the gaps between the silver-loaded zinc oxide nanowhiskers and the multi-walled carbon nanotubes. By combining modified polyphenylene sulfide, silver-loaded zinc oxide nanocrystals, and carbon-based fillers, the flame-retardant, high-temperature resistant, and corrosion-resistant conductive fiber of this application can generate a complex conductive network. In addition, the doping of ammonium persulfate causes some segments of the linear polyphenylene sulfide to oxidize and generate high molecular ions, which form an effective combination with the conductive network. Therefore, it has good conductivity and can fully overcome the defect of high resistivity of polyphenylene sulfide. It is suitable for manufacturing special protective clothing and protective gear for gas leaks, chemical accident rescue, and other occasions.

[0009] Preferably, the modified polyphenylene sulfide is prepared according to the following method:

[0010] Epoxy-modified carbon nanotubes were added to an organic solvent to obtain a nanotube dispersion. Aminated polyphenylene sulfide was added to the organic solvent and stirred, and then added to the nanotube dispersion for heating and reaction. After the reaction was completed, the product was washed and dried to obtain modified polyphenylene sulfide. The aminated polyphenylene sulfide is a polyphenylene sulfide with an amino group on the benzene ring, and the epoxy-modified nanotubes are multi-walled carbon nanotubes with epoxy groups on the surface.

[0011] By adopting the above technical solution, this application reacts epoxy-modified carbon nanotubes with aminated polyphenylene sulfide in an organic solvent. Under the action of amino groups, the epoxy groups are opened, thereby binding multi-walled carbon nanotubes to the molecular chain of linear polyphenylene sulfide, thus obtaining modified polyphenylene sulfide.

[0012] Preferably, the aminated polyphenylene sulfide is prepared according to the following method:

[0013] Linear polyphenylene sulfide is nitrated by heating with a mixture of concentrated nitric acid and concentrated sulfuric acid to obtain nitrated polyphenylene sulfide. The nitrated polyphenylene sulfide is then reduced with a reducing agent to obtain aminated polyphenylene sulfide.

[0014] By adopting the above technical solution, this application first causes the linear polyphenylene sulfide to undergo a nitration reaction under the action of a nitrate-sulfur mixed acid, introducing nitro groups onto the benzene ring of the linear polyphenylene sulfide, and then causes the nitro groups to undergo a reduction reaction, thereby obtaining an aminated polyphenylene sulfide.

[0015] Preferably, the epoxy-modified carbon nanotubes are prepared according to the following method:

[0016] Hydroxylated multi-walled carbon nanotubes were added to toluene and ultrasonically dispersed under nitrogen protection. Then, a butyllithium n-hexane solution was added, and ultrasonic dispersion was continued. Epichlorohydrin was then added and the mixture was stirred to react. After the reaction was completed, the product was washed and dried to obtain epoxy-modified carbon nanotubes.

[0017] By adopting the above technical solution, this application uses butyllithium to react hydroxylated multi-walled carbon nanotubes with epichlorohydrin, grafting epoxy groups onto the surface of the multi-walled carbon nanotubes to obtain epoxy-modified carbon nanotubes.

[0018] Preferably, the carbon-based filler comprises reduced graphene oxide, which is prepared according to the following method:

[0019] Graphene oxide was ultrasonically dispersed in an organic solvent, then Grignard reagent was added, and the mixture was refluxed and stirred under water bath heating conditions. The product was washed sequentially with organic solvent, deionized water, and hydrochloric acid, and then dried to obtain reduced graphene oxide.

[0020] By employing the above-described technical solution, this application uses Grignard reagents to reduce graphene oxide, preparing reduced graphene oxide. Through this reaction, the organic groups of the Grignard reagent can covalently bind to the surface and edges of the graphene sheets, effectively hindering the aggregation of reduced graphene oxide. This results in good dispersion of the reduced graphene oxide, allowing it to exist in a completely exfoliated sheet form. By interleaving the reduced graphene oxide with modified polyphenylene sulfide and silver-loaded zinc oxide nanocrystals, the structure of the conductive network can be optimized, contributing to improved conductivity of the conductive fibers.

[0021] Preferably, the Grignard reagent is selected from thiophene magnesium bromide, phenyl magnesium bromide or n-butyl magnesium bromide.

[0022] By adopting the above technical solution, among the three types of reagents, magnesium phenyl bromide can most effectively improve the conductivity of reduced graphene oxide, which helps to improve the conductivity of conductive fibers.

[0023] Preferably, the carbon-based filler further includes modified carbon black, which is prepared according to the following method:

[0024] Carbon black is placed in an electric furnace and heated to 1500-1550℃ under nitrogen protection. After holding at this temperature for 60-90 minutes, the temperature is lowered. Carbon dioxide is then introduced at 1000-1050℃, and the temperature is held for 90-120 minutes before the temperature is allowed to drop naturally to obtain modified carbon black.

[0025] By adopting the above technical solution, this application heat-treats carbon black at 1500-1550℃ and maintains the temperature in a carbon dioxide atmosphere. Through the above treatment, the carbon black can undergo rearrangement, which reduces surface defects and increases the degree of graphitization. Therefore, when modified carbon black is combined with modified polyphenylene sulfide and silver-loaded zinc oxide nanocrystals, it can effectively improve the conductivity of conductive fibers.

[0026] Preferably, the silver-loaded zinc oxide nanocrystals are prepared according to the following method:

[0027] (1) Zinc nitrate, sodium hydroxide and surfactant were added to water to prepare a mixed solution. The mixed solution was stirred and the reaction was carried out in a polytetrafluoroethylene reactor under heat preservation to obtain zinc oxide nanocrystals.

[0028] (2) Disperse zinc oxide nanocrystals in deionized water to obtain a whisker dispersion. Add silver nitrate solution and glucose solution to the whisker dispersion. After stirring and reacting, wash and dry the product to obtain silver-loaded zinc oxide nanocrystals.

[0029] By adopting the above technical solution, this application first prepared zinc oxide nanowhiskers using zinc nitrate as the zinc source, and then formed nanoscale silver particles on the surface of the zinc oxide whiskers through a silver mirror reaction, thereby obtaining silver-loaded zinc oxide nanowhiskers.

[0030] Secondly, this application provides a fabric, which adopts the following technical solution.

[0031] A fabric woven from any of the flame-retardant, high-temperature resistant, corrosion-resistant, and conductive fibers described above.

[0032] By adopting the above technical solution, the fabric woven from the flame-retardant, high-temperature resistant, corrosion-resistant, and conductive fibers of this application can effectively reduce the accumulation of static electricity. Therefore, clothing made from this fabric is particularly suitable for use in situations such as gas leaks and chemical accident rescue.

[0033] Thirdly, this application provides a method for preparing flame-retardant, high-temperature resistant, and corrosion-resistant conductive fibers, using the following technical solution.

[0034] A method for preparing flame-retardant, high-temperature resistant, and corrosion-resistant conductive fibers includes the following steps:

[0035] (1) Linear polyphenylene sulfide, modified polyphenylene sulfide, conductive additives, coupling agents, antioxidants, and processing aids are mixed and then extruded and granulated to obtain conductive masterbatch;

[0036] (2) The conductive masterbatch is used as raw material for spinning to obtain matrix fiber. The matrix fiber is immersed in ammonium persulfate aqueous solution, and after heat treatment, the fiber is taken out, washed and dried to obtain flame-retardant, high-temperature resistant and corrosion-resistant conductive fiber.

[0037] By adopting the above technical solution, this application first prepares a conductive masterbatch, then uses the conductive masterbatch for spinning to obtain matrix fibers, and then obtains flame-retardant, high-temperature resistant, and corrosion-resistant conductive fibers by doping with ammonium persulfate. During the doping process of ammonium persulfate, some segments of the linear polyphenylene sulfide are oxidized to generate polymer ions, which form an effective combination with the conductive network. Therefore, the flame-retardant, high-temperature resistant, and corrosion-resistant conductive fibers of this application have good conductivity.

[0038] In summary, this application has the following beneficial effects:

[0039] 1. This application grafts multi-walled carbon nanotubes onto linear polyphenylene sulfide (PPS) to obtain modified PPS. Then, modified PPS is added to the linear PPS base, and silver-loaded zinc oxide nanowhiskers and at least one carbon-based filler are preferred as conductive additives. Ammonium persulfate is also used to dope the matrix fibers. Through the synergistic effect of the modified PPS, silver-loaded zinc oxide nanowhiskers, carbon-based fillers, and the ionized organic segments generated by ammonium persulfate doping, the flame-retardant, high-temperature resistant, and corrosion-resistant conductive fibers of this application exhibit excellent conductivity, fully overcoming the high resistivity defect of PPS while retaining the advantages of PPS such as high-temperature resistance, flame retardancy, and corrosion resistance. This makes them suitable for manufacturing special protective clothing and gear for gas leaks, chemical accident rescue, and other emergency situations.

[0040] 2. This application prepared reduced graphene oxide. By interleaving the reduced graphene oxide with modified polyphenylene sulfide and silver-loaded zinc oxide nanocrystals, the structure of the conductive network can be optimized, which helps to improve the conductivity of the conductive fiber.

[0041] 3. In this application, carbon black was heat-treated at 1500-1550℃ to prepare modified carbon black. Within this temperature range, carbon black undergoes rearrangement, which reduces surface defects and increases the degree of graphitization. The resulting modified carbon black, when combined with modified polyphenylene sulfide and silver-loaded zinc oxide nanocrystals, can effectively improve the conductivity of conductive fibers. Detailed Implementation

[0042] The present application will be further described in detail below with reference to the embodiments, preparation examples and comparative examples. The raw materials involved in the present application can all be obtained commercially.

[0043] Preparation example of modified polyphenylene sulfide

[0044] The following explanation uses Preparation Example 1 as an example.

[0045] Preparation Example 1

[0046] In this preparation example, the modified polyphenylene sulfide was prepared according to the following method:

[0047] (1) Weigh linear polyphenylene sulfide powder (fiber grade, Fortron 0320 Ticona PPS), concentrated nitric acid (65wt%), concentrated sulfuric acid (98wt%), DMF, and sodium dithionite according to the ratio of 1g:1mL:10mL:20mL:1.2g. Add the linear polyphenylene sulfide to the concentrated sulfuric acid and add concentrated nitric acid dropwise while stirring magnetically. Continue stirring until the solution becomes transparent. Heat to 65℃ and react for 1h. After washing and drying the product, add it to DMF and stir to mix. Then add sodium dithionite and heat under nitrogen protection at 165℃ under reflux and magnetic stirring for 5h. Wash the product with ethanol and deionized water alternately until the filtrate is colorless. Dry the filtrate at 80℃. The product was prepared by extracting an aminated polyphenylene sulfide (PPS) and set aside. Hydroxylated multi-walled carbon nanotubes, toluene, butyllithium hexane solution (2.4 M), and epichlorohydrin were weighed according to a ratio of 0.2 g: 40 mL: 3 mL: 0.5 mL. The hydroxylated PPS was added to toluene and ultrasonically dispersed for 3 h under nitrogen protection. Then, butyllithium hexane solution was added, and ultrasonic dispersion was continued for 1 h. Epichlorohydrin was then added and the mixture was stirred for 1 h. After the reaction was complete, the product was washed with acetone and dried at 30 °C to obtain epoxy-modified carbon nanotubes, set aside.

[0048] (2) Weigh the amino-modified polyphenylene sulfide and epoxy-modified carbon nanotubes at a weight ratio of 8:1. Add the epoxy-modified carbon nanotubes to 1-chloronaphthalene to obtain a nanotube dispersion. Add the amino-modified polyphenylene sulfide to 1-chloronaphthalene and stir. Then add it to the nanotube dispersion and heat it at 260°C for 3 hours. After the reaction is complete, wash the product with ethanol and deionized water alternately until the filtrate is colorless. Dry the filter cake at 80°C to obtain the modified polyphenylene sulfide.

[0049] Example of preparation of reduced graphene oxide

[0050] The following explanation uses Preparation Example 2 as an example.

[0051] Preparation Example 2

[0052] In this preparation example, the Grignard reagent used is thienyl magnesium bromide.

[0053] In this preparation example, the reduced graphene oxide was prepared according to the following method:

[0054] Graphene oxide, tetrahydrofuran, and Grignard reagent were weighed according to a ratio of 5g:30mL:10g. Graphene oxide was added to an organic solvent and ultrasonically dispersed. Then Grignard reagent was added, and the mixture was refluxed and stirred for 24h under a water bath heating condition of 80℃. The product was washed with tetrahydrofuran, deionized water, and hydrochloric acid in sequence. Finally, the product was vacuum dried at 60℃ to obtain reduced graphene oxide.

[0055] Preparation Example 3

[0056] The difference between this preparation example and preparation example 2 is that the Grignard reagent used is n-butylmagnesium bromide.

[0057] Preparation Example 4

[0058] The difference between this preparation example and Preparation Example 2 is that the Grignard reagent used is magnesium phenyl bromide.

[0059] Preparation example of modified carbon black

[0060] In Preparation Examples 5-7, ECP-600JD (Lion Corporation, Japan) was used as the carbon black.

[0061] Preparation Example 5

[0062] In this preparation example, the modified carbon black was prepared by the following method: carbon black was placed in an electric furnace, heated to 1500℃ under nitrogen protection, held at that temperature for 60 min and then cooled down, carbon dioxide was introduced at 1000℃, held at that temperature for 90 min and then cooled down naturally to obtain modified carbon black.

[0063] Preparation Example 6

[0064] In this preparation example, the modified carbon black was prepared by the following method: carbon black was placed in an electric furnace, heated to 1525°C under nitrogen protection, held at that temperature for 75 min and then cooled down, carbon dioxide was introduced at 1025°C, held at that temperature for 100 min and then cooled down naturally to obtain modified carbon black.

[0065] Preparation Example 7

[0066] In this preparation example, the modified carbon black was prepared by the following method: carbon black was placed in an electric furnace, heated to 1550℃ under nitrogen protection, held at that temperature for 90 min and then cooled down, carbon dioxide was introduced at 1050℃, held at that temperature for 120 min and then cooled down naturally to obtain modified carbon black.

[0067] Preparation example of silver-loaded zinc oxide nanowhiskers

[0068] The following explanation uses Preparation Example 8 as an example.

[0069] Preparation Example 8

[0070] In this preparation example, silver-loaded zinc oxide nanocrystals were prepared according to the following method:

[0071] (1) Add 0.595g zinc nitrate hexahydrate, 1.60g sodium hydroxide and 0.232g surfactant (SDBS) to 40g water to prepare a mixed solution. Stir the mixed solution and react it at 100℃ for 15h in a polytetrafluoroethylene reactor to obtain zinc oxide nanocrystals.

[0072] (2) Zinc oxide nanocrystals were dispersed in deionized water at a ratio of 1g:500mL to obtain a whisker dispersion. 0.1mol / L silver nitrate solution and 0.5mol / L glucose solution were added to the whisker dispersion at a ratio of 1g:50mL:50mL. After stirring for 4h, the mixture was filtered. The filter cake was washed and dried to obtain silver-loaded zinc oxide nanocrystals with an average length of 3μm and an average diameter of 130μm.

[0073] Examples 1-5

[0074] The following description uses Example 1 as an example.

[0075] Example 1

[0076] In this embodiment, the linear polyphenylene sulfide is Fortron 0320 Ticona PPS, the modified polyphenylene sulfide is prepared according to the method of Preparation Example 1, the conductive additive is composed of silver-loaded zinc oxide nanocrystals, graphene and carbon black in a weight ratio of 3:2:7, the silver-loaded zinc oxide nanocrystals are prepared according to the method of Preparation Example 8, the carbon black is ECP-600JD (Lion Corporation, Japan); the coupling agent is KH590, the antioxidant is composed of antioxidant 168 and antioxidant 1010 mixed in a weight ratio of 2:1, and the processing aid is pentaerythritol stearate.

[0077] This embodiment provides a flame-retardant, high-temperature resistant, and corrosion-resistant conductive fiber, which is obtained by doping a matrix fiber with ammonium persulfate. The matrix fiber includes the following raw material components by weight: 750g of linear polyphenylene sulfide, 130g of modified polyphenylene sulfide, 60g of conductive additives, 8g of coupling agent, 3g of antioxidant, and 5g of processing aids.

[0078] This embodiment also provides a fabric made of flame-retardant, high-temperature resistant, corrosion-resistant, and conductive fibers, with a surface density of 196 g / m². 2 .

[0079] This embodiment provides a method for preparing flame-retardant, high-temperature resistant, and corrosion-resistant conductive fibers, including the following steps:

[0080] (1) Linear polyphenylene sulfide, modified polyphenylene sulfide, conductive additives, coupling agents, antioxidants, and processing aids are mixed and then extruded and granulated to obtain conductive masterbatch;

[0081] (2) Using conductive masterbatch as raw material, the fiber is spun at 320℃ at a rate of 25m / min. After the fiber leaves the spinning area, it is cooled to 20℃ at a rate of 20℃ / h to obtain matrix fiber. The matrix fiber is immersed in 30wt% ammonium persulfate aqueous solution at a solid-liquid ratio of 1:20. After heating at 70℃ for 3 days, the fiber is taken out, washed and dried to obtain flame-retardant, high-temperature resistant and corrosion-resistant conductive fiber.

[0082] As shown in Table 1, the main difference between Examples 1-5 is that the raw material ratio of the matrix fiber is different.

[0083] Table 1 Raw material ratio of matrix fiber

[0084]

[0085] Example 6

[0086] The difference between this embodiment and Example 5 is that the graphene is replaced with the reduced graphene oxide of Preparation Example 2.

[0087] Example 7

[0088] The difference between this embodiment and Example 5 is that the graphene is replaced with the reduced graphene oxide of Preparation Example 3.

[0089] Example 8

[0090] The difference between this embodiment and Example 5 is that the graphene is replaced with the reduced graphene oxide of Preparation Example 4.

[0091] Example 9

[0092] The difference between this embodiment and Example 8 is that the carbon black is replaced with the modified carbon black of Preparation Example 5.

[0093] Example 10

[0094] The difference between this embodiment and Example 8 is that the carbon black is replaced with the modified carbon black of Preparation Example 6.

[0095] Example 11

[0096] The difference between this embodiment and Example 8 is that the carbon black is replaced with the modified carbon black of Preparation Example 7. Comparative Example

[0097] Comparative Example 1

[0098] The difference between this comparative example and Example 1 is that the modified polyphenylene sulfide was replaced with the same weight of linear polyphenylene sulfide (Fortron 0320 Ticona PPS).

[0099] Comparative Example 2

[0100] The difference between this comparative example and Example 1 is that the conductive additive does not include carbon-based fillers.

[0101] Comparative Example 3

[0102] The difference between this comparative example and Example 1 is that the conductive additive does not include silver-loaded zinc oxide nanocrystals.

[0103] Comparative Example 4

[0104] The difference between this comparative example and Example 1 is that the silver-loaded zinc oxide nanocrystals are replaced with zinc oxide nanocrystals (average length 3 μm, average diameter 130 μm).

[0105] Performance testing methods

[0106] The conductive fibers of each embodiment and comparative example were clamped with an insulation resistance meter and the resistance of the conductive fibers was measured under the conditions of 25°C and 40% air humidity. Then the resistivity ρ was calculated according to ρ=RS / L. The results are shown in Table 2.

[0107] Table 2 Relative Resistivity

[0108]

[0109] As can be seen from Examples 1-5 and Comparative Examples 1-4, and Table 2, the relative resistivity measured in Examples 1-11 is significantly lower than that in Comparative Examples 1-4. This is because the combination of modified polyphenylene sulfide, silver-loaded zinc oxide nanocrystals, and carbon-based fillers in Examples 1-11 creates a complex conductive network in the flame-retardant, high-temperature resistant, and corrosion-resistant conductive fibers. In addition, the doping of ammonium persulfate causes the oxidation of some segments of the linear polyphenylene sulfide to generate polymer ions, which form an effective combination with the conductive network, thus exhibiting good conductivity and fully overcoming the defect of high resistivity of polyphenylene sulfide.

[0110] As can be seen from Example 1 and Comparative Example 1 and Table 2, when the modified polyphenylene sulfide is missing in the matrix fiber, the formation of the conductive network is affected because the multi-walled carbon nanotubes cannot be uniformly dispersed with the modified polyphenylene sulfide, resulting in a high resistivity and unsatisfactory conductivity of the fiber in Comparative Example 1.

[0111] Based on Example 1 and Comparative Examples 2-3, and in conjunction with Table 2, it can be seen that when the conductive additive lacks carbon-based fillers or silver-loaded zinc oxide nanocrystals, the formation of the conductive network is affected, resulting in higher fiber resistivity and less than ideal conductivity in Comparative Examples 2-3.

[0112] Based on Example 1 and Comparative Example 4, and in conjunction with Table 2, it can be seen that zinc oxide nanofibers contribute relatively little to conductivity and cannot fully exert their synergistic conductivity effect. Therefore, the resistivity of the fibers in Comparative Example 4 is relatively high, and the conductivity is not ideal.

[0113] Combining Examples 5 and 6-8 with Table 2, it can be seen that the resistivity measured in Examples 6-8 is relatively low. This is because the organic groups introduced by the Grignard reagent effectively hinder the aggregation of reduced graphene oxide, resulting in good dispersion and allowing the reduced graphene oxide to exist in a completely exfoliated sheet form. Through the interlocking of reduced graphene oxide with modified polyphenylene sulfide and silver-loaded zinc oxide nanocrystals, the structure of the conductive network can be optimized, which helps to improve the conductivity of the conductive fibers. The test results of Examples 6-8 show that the reduced graphene oxide prepared using magnesium phenyl bromide contributes the most to the conductivity of the conductive fibers.

[0114] As can be seen from Examples 8 and 9-11 and Table 2, the resistivity measured in Examples 9-11 is relatively low. This is because under the modification conditions selected in this application, carbon black undergoes rearrangement, surface defects are reduced, and the degree of graphitization is improved. Therefore, by combining it with modified polyphenylene sulfide and silver-loaded zinc oxide nanocrystals, the conductivity of conductive fibers can be effectively improved.

[0115] The above embodiments are merely explanations of this application and are not intended to limit it. After reading this specification, those skilled in the art can make modifications to the embodiments of this application without contributing any inventive step, but such modifications are protected by patent law as long as they are within the scope of the claims of this application.

Claims

1. A flame-retardant, high-temperature resistant, corrosion-resistant, and conductive fiber, characterized in that, The conductive fiber is obtained by doping a matrix fiber with ammonium persulfate. The matrix fiber comprises the following raw material components in parts by weight: 75-85 parts of linear polyphenylene sulfide, 13-15 parts of modified polyphenylene sulfide, 6-8 parts of conductive additives, 0.8-1.2 parts of coupling agent, 0.3-0.6 parts of antioxidant, and 0.5-0.7 parts of processing aids. The modified polyphenylene sulfide is a graft of multi-walled carbon nanotubes and linear polyphenylene sulfide. The conductive additives include silver-loaded zinc oxide nanocrystals and at least one carbon-based filler. The carbon-based filler includes reduced graphene oxide, which is prepared according to the following method: Graphene oxide was ultrasonically dispersed in an organic solvent, then Grignard reagent was added, and the mixture was refluxed and stirred under water bath heating conditions. The product was washed sequentially with organic solvent, deionized water, and hydrochloric acid, and then dried to obtain reduced graphene oxide. The Grignard reagent was selected from thiophene magnesium bromide, phenyl magnesium bromide, or n-butyl magnesium bromide. The carbon-based filler further includes modified carbon black, which is prepared according to the following method: Carbon black is placed in an electric furnace and heated to 1500-1550℃ under nitrogen protection. After holding at this temperature for 60-90 minutes, the temperature is lowered. Carbon dioxide is then introduced at 1000-1050℃ and held at this temperature for 90-120 minutes before being allowed to cool naturally to obtain modified carbon black. The silver-loaded zinc oxide nanocrystals were prepared according to the following method: (1) Zinc nitrate, sodium hydroxide and surfactant were added to water to prepare a mixed solution. The mixed solution was stirred and the reaction was carried out in a polytetrafluoroethylene reactor under heat preservation to obtain zinc oxide nanocrystals. (2) Disperse zinc oxide nanocrystals in deionized water to obtain a whisker dispersion. Add silver nitrate solution and glucose solution to the whisker dispersion. After stirring and reacting, wash and dry the product to obtain silver-loaded zinc oxide nanocrystals.

2. The flame-retardant, high-temperature resistant, corrosion-resistant conductive fiber according to claim 1, characterized in that, The modified polyphenylene sulfide was prepared according to the following method: Epoxy-modified carbon nanotubes were added to an organic solvent to obtain a nanotube dispersion. Aminated polyphenylene sulfide was added to the organic solvent and stirred, and then added to the nanotube dispersion for heating and reaction. After the reaction was completed, the product was washed and dried to obtain modified polyphenylene sulfide. The aminated polyphenylene sulfide is a polyphenylene sulfide with an amino group on the benzene ring, and the epoxy-modified nanotubes are multi-walled carbon nanotubes with epoxy groups on the surface.

3. The flame-retardant, high-temperature resistant, corrosion-resistant conductive fiber according to claim 2, characterized in that, The aminated polyphenylene sulfide is prepared according to the following method: Linear polyphenylene sulfide is nitrated by heating with a mixture of concentrated nitric acid and concentrated sulfuric acid to obtain nitrated polyphenylene sulfide. The nitrated polyphenylene sulfide is then reduced with a reducing agent to obtain aminated polyphenylene sulfide.

4. The flame-retardant, high-temperature resistant, corrosion-resistant conductive fiber according to claim 2, characterized in that, The epoxy-modified carbon nanotubes were prepared according to the following method: Hydroxylated multi-walled carbon nanotubes were added to toluene and ultrasonically dispersed under nitrogen protection. Then, a butyllithium n-hexane solution was added, and ultrasonic dispersion was continued. Epichlorohydrin was then added and the mixture was stirred to react. After the reaction was completed, the product was washed and dried to obtain epoxy-modified carbon nanotubes.

5. A fabric, characterized in that, It is woven from the flame-retardant, high-temperature resistant, corrosion-resistant, and conductive fibers as described in any one of claims 1-4.

6. The method for preparing flame-retardant, high-temperature resistant, corrosion-resistant, and conductive fibers according to any one of claims 1-4, characterized in that, Includes the following steps: (1) Linear polyphenylene sulfide, modified polyphenylene sulfide, conductive additives, coupling agents, antioxidants, and processing aids are mixed and then extruded and granulated to obtain conductive masterbatch; (2) The conductive masterbatch is used as raw material for spinning to obtain matrix fiber. The matrix fiber is immersed in ammonium persulfate aqueous solution, and after heat treatment, the fiber is taken out, washed and dried to obtain flame-retardant, high-temperature resistant and corrosion-resistant conductive fiber.

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