Conductive aramid fiber and preparation method thereof

Abstract

The invention relates to the field of composite materials, in particular to conductive aramid fiber and a preparation method thereof.The preparation method comprises the following steps that S101, an aramid fiber sample is subjected to first treatment, and first aramid fiber is obtained; s102, obtaining a second aramid fiber; s103, obtaining a third aramid fiber; s104, obtaining a fourth aramid fiber, namely the conductive aramid fiber; wherein the aramid fiber sample is aramid fiber III. According to the method, the aramid sample does not need to be subjected to roughening treatment, the surface of the aramid sample is stably combined with the nanogold layer through amide group modification, residual modification liquid treatment, metal nanolayer preparation and chemical deposition method metal layer plating, the metal layer is not prone to falling off, the whole process is simple and easy to implement, operation is convenient, economical and environmentally friendly, large-scale production is easy to achieve, and the method is suitable for industrial production. Meanwhile, the mechanical property of the aramid fiber sample is hardly influenced, and the original strength and performance of the aramid fiber sample are kept.

Description

Technical Field

[0001] The invention relates to the field of composite materials, and in particular to a conductive aramid fiber and a preparation method thereof. Background Art

[0002] With the rapid development of science and technology, especially in the fields of aerospace, military industry, electronic information, energy and security protection, the requirements for materials are becoming more and more stringent. Not only do they need to have basic properties such as high strength, high modulus, high temperature resistance and corrosion resistance, they also often need to have special functions such as conductivity and electromagnetic shielding.

[0003] Aramid fiber, as a high-performance synthetic fiber, has been widely used in many industrial fields due to its excellent mechanical properties, thermal stability and chemical stability. However, traditional aramid fiber does not have conductivity, which to a certain extent limits its application in occasions that require conductivity or electromagnetic shielding functions. Therefore, how to give aramid fiber conductivity and develop conductive aramid fiber has become an important research direction in the field of materials science.

[0004] Traditionally, conductive components are introduced into aramid fibers through composite or blending technology to make them conductive. However, this method is usually difficult to process, and the mixed conductive materials have great differences in performance from aramid fibers, which greatly limits their application range. In addition, with the improvement of environmental awareness, the research on conductive aramid also pays more attention to the sustainability and environmental friendliness of materials. How to use environmentally friendly preparation processes and raw materials to develop conductive aramid materials with excellent performance and environmental friendliness is also one of the important directions of current research.

[0005] Chinese patent application CN115613014A discloses a method for chemical silver plating on aramid fabrics. The etching, coarsening, sensitization, activation and other steps of this method cause great damage to the aramid material and seriously affect the various properties of the aramid material. Chinese patent application CN109554917A discloses a method for pretreating conductive aramid fibers. This method forms a three-layer structure of aramid + modifier + metal layer by combining a modifier on the aramid surface. The treatment is complicated and environmentally friendly. Chinese patent application CN109438980A discloses a method for preparing a light absorber. This method is to fiberize the aramid material and then compound metal nanoparticles on it. The fiberization of aramid materials will seriously affect the original excellent properties of the material (such as mechanical strength properties, high modulus, etc.), and the way of compounding metal nanoparticles in this method is to simply dry the metal nanoparticles on the material, which has low binding force and is easy to peel off. Summary of the invention

[0006] In a first aspect, the present invention provides a method for preparing a conductive aramid fiber, characterized in that it comprises the following steps: S101 performing a first treatment on the aramid sample so that the aramid sample remains in a slightly bent state, thereby obtaining a first aramid, wherein the first treatment specifically comprises stretching the aramid sample to a second length, wherein the second length comprises 70%-90% of the first length of the aramid sample; In some embodiments, the first length is the distance between two ends of the aramid sample when it is completely straightened.

[0007] In some embodiments, the second length is the distance between two ends of the aramid sample.

[0008] In some embodiments, the aramid sample is aramid III fiber.

[0009] In some embodiments, the aramid sample is para-aramid.

[0010] In some embodiments, the aramid sample is a bundled yarn sample and / or a monofilament sample. In some embodiments, when the aramid sample is a bundled yarn sample, the bundled yarn sample is composed of at least 2 aramid monofilaments, such as 6 or 12 aramid monofilaments.

[0011] S102 soaking the first aramid fiber in a chloroauric acid solution for a first time and subjecting the first aramid fiber to a second treatment to obtain a second aramid fiber, wherein the second treatment comprises ultrasound or vibration; In some embodiments, in step S102, the duration of the second treatment comprises 10-15 minutes.

[0012] In some embodiments, the frequency of the ultrasound comprises 20 kHz to 100 kHz.

[0013] In some embodiments, the frequency of the oscillations comprises 6-10 times per minute.

[0014] In some embodiments, the concentration of the chloroauric acid solution comprises 0.5-1 mM.

[0015] In some embodiments, the first time comprises 1-3 hours.

[0016] In some embodiments, the first time is 2-3 hours.

[0017] S103 soaking the second aramid fiber in a reducing agent for a second time and performing a second treatment on the second aramid fiber to obtain a third aramid fiber; In some embodiments, the second treatment time includes 5-20 minutes In some embodiments, the second time comprises 5-20 minutes.

[0018] In some embodiments, in step S103, the time of the second processing is the same as the second time.

[0019] In some embodiments, the reducing agent comprises sodium borohydride.

[0020] In some embodiments, the concentration of the reducing agent comprises 0.1-0.5M.

[0021] S104 soaking the third aramid fiber in the first reaction liquid for a third time to obtain a fourth aramid fiber, namely the conductive aramid fiber; In some embodiments, the third time comprises 3-5 hours.

[0022] In some embodiments, a ratio of the first time to the third time includes 0.4 - 1:1.

[0023] In some embodiments, a ratio of the first time to the third time is 0.4-0.6:1.

[0024] In some embodiments, a ratio of the first time to the third time is 0.6-1:1.

[0025] In some embodiments, a ratio of the first time to the third time is 0.75-1:1.

[0026] In some embodiments, the first reaction solution comprises components of water, anhydrous sodium sulfite, formaldehyde and sodium gold sulfite.

[0027] In some embodiments, the first reaction solution specifically comprises: 25 mL of water, 0.4 g of anhydrous sodium sulfite, 1.5 mL of 40% formaldehyde aqueous solution, and 0.8-1 mL of 99% sodium gold sulfite aqueous solution.

[0028] In a second aspect, the present invention provides a conductive aramid fiber prepared based on the above preparation method.

[0029] Compared with the prior art, the beneficial effects of the present invention include at least the following aspects: Aramid fiber is a synthetic aromatic polyamide, which is defined by the U.S. Federal Trade Commission as a long-chain polyamide with at least 85% of the amide bonds directly connected to two benzene rings. Aramid III is a para-aramid fiber obtained by co-condensation of three monomers: p-phenylenediamine, terephthaloyl chloride, and diamine containing a heterocyclic structure. Aramid III has ultra-high strength and modulus. Its tensile strength can reach more than 5.0 GPa, and its tensile elastic modulus is between 150-180 GPa, which is 5-6 times that of high-quality steel, and its modulus is 2-3 times that of steel or glass fiber. At the same time, aramid III has good thermal stability and can maintain its performance without degradation in high temperature environments, meeting the harsh space application conditions. Aramid III has excellent impact resistance and wear resistance, and can be used for a long time in harsh environments without damage. In addition, aramid III also has the characteristics of weather resistance, water resistance, corrosion resistance, and strong UV resistance, which can meet the needs of a variety of complex environments. It is a high-tech special fiber with excellent comprehensive performance. Although aramid fiber has many excellent properties as mentioned above, it does not have electrical conductivity. The existing method of preparing conductive aramid actually causes great damage to aramid fiber, which will seriously affect the various properties of aramid fiber, and the plated metal is also easy to separate from the aramid fiber. In other words, the existing technology usually damages the various properties of aramid fiber. Even if the conductivity may be improved, after it has been used for a period of time, the plated metal will fall off, and the conductivity will also decrease. In other words, it is very difficult to enhance the conductivity of aramid fiber while maintaining its original strength and high performance.

[0030] The present invention provides a method for preparing conductive aramid that effectively improves the conductivity of aramid fiber and maintains the mechanical properties of aramid fiber. The present invention finds that it is actually very difficult to evenly form a metal coating on the surface of aramid fiber, especially on the bundled yarn sample of aramid fiber. The present invention creatively controls the state between the monofilaments of aramid fiber through the first processing step and the second processing step, so that the monofilaments do not contact each other, and the adverse effect of surface tension on gold plating between the monofilaments is further controlled, so that a uniform metal coating can be formed on the surface of each monofilament. In addition, the present invention does not require roughening treatment, and the nano-gold particles plated on the aramid sample have a strong force with the aramid fiber, which can promote the firm combination of the metal coating and the aramid surface. Compared with the traditional complex metal process, the present invention significantly improves the adhesion and durability of the metal coating, reduces the risk of falling off, and ensures the long-term maintenance of the conductivity of the aramid fiber.

[0031] In addition, the present invention also found that when the gold plating time is greater than the third time (i.e., 5 hours), although the conductivity of the aramid fiber will be further improved, its original mechanical properties may be reduced, and the reaction container will be interfered with, making it difficult to prepare conductive aramid in batches based on the same reaction container. The present invention controls the third time and the ratio of the third time to the first time to synergistically ensure that the excellent conductivity of the aramid fiber is given while maintaining the mechanical properties of the aramid fiber, significantly reducing the potential adverse effects on the mechanical properties of the aramid fiber, while ensuring that the performance of each monofilament of the aramid fiber is not damaged. In addition, controlling the third time and the ratio of the third time to the first time also ensures that the complexing groups introduced by chemical bonding can be more evenly distributed, so that during the fiber activation treatment process, the activated metal can be more evenly deposited on the surface of the aramid sample. This synergistically directly promotes the uniformity of the subsequent metal plating formation, laying a solid foundation for manufacturing conductive aramid with better quality and more stable performance.

[0032] The method provided by the present invention is not only applicable to bundled wire samples, but also to monofilament samples. In addition, the overall process flow of the present invention is simple in design and easy and quick to operate, which not only improves production efficiency but also reduces the technical requirements for operators. The present invention meets environmental protection requirements, reduces the use of chemical reagents and the generation of waste liquid, and is conducive to sustainable development. Due to the stability and repeatability of the present invention, the present invention is very suitable for large-scale industrial production, which helps to reduce production costs and improve the consistency of product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, each element or part is not necessarily drawn according to the actual scale. Obviously, the drawings described below are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without paying creative labor.

[0034] Figure 1 Scanning electron micrograph of the aramid sample before gold coating; Figure 2 is a scanning electron microscope image of sample example 5; Figure 3 This is the scanning electron microscope energy spectrum analysis diagram of sample example 3 (left: gold element; middle: carbon element; right: oxygen element); Figure 4 This is the scanning electron microscope energy spectrum analysis diagram of sample example 4 (left: gold element; middle: carbon element; right: oxygen element); Figure 5 This is the scanning electron microscope energy spectrum analysis diagram of sample example 5 (left: gold element; middle: carbon element; right: oxygen element); Figure 6 Schematic diagram of the first process of the present invention. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0036] In this document, the directions or positional relationships indicated by the terms "upper", "lower", "inner", "outer", "front", "rear", "one end", "the other end", etc. are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0037] Herein "and / or" includes any and all combinations of one or more of the associated listed items.

[0038] Herein, "plurality" means two or more than two, ie, it includes two, three, four, five, etc.

[0039] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0040] As used in this specification, the term "about" typically means + / - 5% of the stated value, more typically + / - 4% of the stated value, more typically + / - 3% of the stated value, more typically + / - 2% of the stated value, even more typically + / - 1% of the stated value, and even more typically + / - 0.5% of the stated value.

[0041] In this specification, some embodiments may be disclosed in a format of being in a range. It should be understood that this description of "being in a range" is only for convenience and brevity, and should not be interpreted as a rigid limitation on the disclosed range. Therefore, the description of the range should be considered to have specifically disclosed all possible sub-ranges and independent numerical values ​​within this range. For example, the description of the range 1-6 should be considered to have specifically disclosed sub-ranges such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., as well as individual numbers within this range, such as 1, 2, 3, 4, 5 and 6. Regardless of the breadth of the range, the above rules apply.

[0042] Embodiment 1 This example is for aramid III code H1 type filament (bundle) (from China Bluestar Chenguang Chemical Research and Design Institute Co., Ltd.), the linear density of the aramid III bundle sample is 200 Tex. The specific method is as follows: S101 performing a first treatment on the aramid sample so that the aramid sample remains in a slightly bent state, thereby obtaining a first aramid, wherein the first treatment specifically comprises stretching the aramid sample to a second length, wherein the second length comprises 70%-90% of the first length of the aramid sample; Specifically, Figure 6 As shown, the aramid sample (bundle sample) can be fixed at both ends with a non-metallic clamp, and the distance between the two ends of the aramid sample can be shortened to a second length L2 (i.e., the length of the aramid sample when fully straightened is 70%-90% (80% as an example) of the first length L1), so as to ensure that the aramid sample remains slightly bent during the entire reaction process, and the individual filaments in the aramid sample do not contact each other except the end points. In addition, the aramid sample must be prevented from contacting the surface of the reaction container.

[0043] The present invention finds that only by keeping the wire bundle sample in a slightly bent state (that is, the wire bundle sample cannot be bent (≥90°) nor can it be kept in a completely straightened state) can a better gold plating effect be achieved. For example, in each step of the process flow, the single filaments of the bent wire bundle sample will contact each other, so that the parts of the wire bundle sample that are in contact with each other that the reaction liquid cannot contact will not be plated with gold or the gold plating effect is poor, which will further lead to uneven metal plating (for example, the plating thickness at the bent and non-bent parts will be different), which will ultimately affect the conductive effect of the wire bundle sample. In the completely straightened wire bundle sample, on the one hand, the parts of the wire bundle sample that are in contact with each other that the reaction liquid cannot contact will not be plated with gold or the gold plating effect is poor, as described above. On the other hand, there are still tiny gaps between the single filaments. Due to the surface tension in the tiny gaps, the reaction liquid cannot contact the surface of the aramid sample with the tiny gaps, which will still affect the gold plating effect and the conductive effect. The present invention keeps the bundled wire sample in a slightly bent state, which can maximize the contact area between the bundled wire sample and the reaction liquid while avoiding the potential influence of tiny gaps. It is also convenient for the discharge of small bubbles during the entire reaction process, thereby achieving better gold plating and conductive effects.

[0044] S102 soaking the first aramid fiber in a chloroauric acid solution for a first time and subjecting the first aramid fiber to a second treatment to obtain a second aramid fiber, wherein the second treatment comprises ultrasound or vibration; Specifically, the aramid sample is reacted with the chloroauric acid solution at 0-50°C for 1-3 hours. During the reaction, the aramid sample is immersed in the chloroauric acid solution (0.5-1 mM), and the aramid sample is subjected to ultrasonic or oscillation treatment in the first 10-15 minutes to prevent the bundles from being completely dispersed and to prevent the existence of unexpelled small bubbles in the bundles, so as to avoid the problem of difficulty in modifying the amide group of the aramid sample in contact with the small bubbles.

[0045] Ultrasound refers to the use of an ultrasonic generator to generate vibrations at a high frequency (e.g., 20kHz to 100kHz), thereby promoting the dispersion of the aramid sample and the mixing of the reaction liquid and the aramid sample. Oscillation treatment refers to the manual or machine shaking of the reaction container 6-10 times per minute. Oscillation treatment needs to prevent the reaction liquid from splashing.

[0046] S103 soaking the second aramid fiber in a reducing agent for a second time and performing a second treatment on the second aramid fiber to obtain a third aramid fiber; Specifically, the second aramid fiber is immersed in a reducing agent (sodium borohydride (0.1 M)) for 5-20 minutes to reduce the surface of the second aramid fiber to a layer of nano-gold particles. During this process, the second aramid fiber needs to be ultrasonically or vibrated to smoothly discharge bubbles on its surface to prevent uneven preparation of nano-gold particles.

[0047] In some embodiments, between step S102 and step S103 , the second aramid fiber is further rinsed with water, wherein the water includes tap water or deionized water.

[0048] S104 soaking the third aramid fiber in the first reaction liquid for a third time to obtain a fourth aramid fiber, namely the conductive aramid fiber; Specifically, the third aramid is immersed in the first reaction liquid. The first reaction liquid causes the gold nanoparticles to continuously aggregate and deposit on the third aramid with the gold nanoparticles on the surface to form a metal coating. The reaction time is 30 minutes to 5 hours. After the reaction is completed, it is rinsed with clean water and dried naturally to finally form a conductive gold-plated aramid.

[0049] The first reaction solution: water (H2O) 25 mL, anhydrous sodium sulfite (Na2SO3) 0.4 g, formaldehyde (HCHO, 40%) 1.5 mL, sodium gold sulfite (Na2Au(SO3)2, 99%, gold content 4.95%-5.05%) 0.8-1 mL.

[0050] Embodiment 2 This embodiment is for aramid III monofilament samples. The difference from the first embodiment is that the first treatment may not be performed on the aramid monofilament samples in this embodiment, and the remaining steps are the same as those in the first embodiment. During the entire reaction process, it is necessary to ensure that the monofilament sample is immersed in the reaction liquid as a whole, does not float on the surface of the reaction liquid, does not contact the reaction liquid container, and does not bend, so as to avoid the problem of uneven thickness of the metal coating. In addition, if a monofilament sample is used, it needs to be twisted into a bundle after gold plating for the next step of weaving.

[0051] Preparation Example 1 After the aramid III sample was immersed in a chloroauric acid solution at 24°C for 3 hours, the residual modification solution was washed and then immersed in sodium borohydride (0.1 M) for 20 minutes. Finally, the aramid III sample was immersed in the first reaction solution for 1 hour to obtain an aramid III sample example 1 with a gold nanofilm.

[0052] Preparation Example 2 After the aramid III sample was immersed in a chloroauric acid solution at 24°C for 3 hours, the residual modification solution was washed and then immersed in sodium borohydride (0.1 M) for 20 minutes. Finally, the aramid III sample was immersed in the first reaction solution for 2 hours to obtain an aramid III sample example 2 with a gold nanofilm.

[0053] Preparation Example 3 At 24°C, the aramid III sample was immersed in a chloroauric acid solution for 3 hours, and then the residual modified solution was cleaned and immersed in sodium borohydride (0.1 M) for 20 minutes. Finally, the aramid III sample was immersed in the first reaction solution for 3 hours to obtain an aramid III sample example 3 with a gold nanofilm. The scanning electron microscope energy spectrum analysis diagram of sample example 3 is shown in Figure 3 .

[0054] Preparation Example 4 At 24°C, the aramid III sample was immersed in a chloroauric acid solution for 3 hours, and then the residual modified solution was cleaned and immersed in sodium borohydride (0.1 M) for 20 minutes. Finally, the aramid III sample was immersed in the first reaction solution for 4 hours to obtain aramid III sample example 4 with a gold nanofilm. The scanning electron microscope energy spectrum analysis diagram of sample example 4 is shown in Figure 4 .

[0055] Preparation Example 5 After the aramid III sample was immersed in a chloroauric acid solution at 24°C for 3 hours, the residual modification solution was cleaned and then immersed in sodium borohydride (0.1 M) for 20 minutes. Finally, the aramid III sample was immersed in the first reaction solution for 5 hours to obtain an aramid III sample example 5 with a gold nanofilm. The scanning electron microscope image of sample example 5 is shown in Figure 2 , scanning electron microscope energy spectrum analysis diagram see Figure 5 .

[0056] Preparation Example 6 After the aramid III sample was immersed in a chloroauric acid solution at 24°C for 2 hours, the residual modification solution was washed and then immersed in sodium borohydride (0.1 M) for 5 minutes. Finally, the aramid III sample was immersed in the first reaction solution for 5 hours to obtain an aramid III sample example 6 with a gold nanofilm.

[0057] Preparation Example 7 After the aramid III sample was immersed in a chloroauric acid solution at 24°C for 2 hours, the residual modification solution was washed and then immersed in sodium borohydride (0.1 M) for 20 minutes. Finally, the aramid III sample was immersed in the first reaction solution for 5 hours to obtain an aramid III sample example 7 with a gold nanofilm.

[0058] Preparation Example 8 After the aramid III sample was immersed in a chloroauric acid solution at 4°C for 3 hours, the residual modification solution was washed and then immersed in sodium borohydride (0.1 M) for 20 minutes. Finally, the aramid III sample was immersed in the first reaction solution for 1 hour to obtain an aramid III sample example 8 with a gold nanofilm.

[0059] The samples used in preparation examples 1-8 are all bundled wire samples, and the scanning electron microscope images of them before gold plating are shown in Figure 1 .

[0060] Table 1 Summary of properties of gold-plated aramid fibers obtained in Preparation Examples 1-8 The results of Preparation Examples 1 to 5 show that, as the time of chemical deposition metallization (i.e., the third time) increases, the nano-gold coating of the aramid III sample becomes more and more dense, the coating becomes thicker, and the resistivity decreases gradually. However, the chemical deposition metallization reaction that exceeds 5 hours may cause the decline of the mechanical properties of the aramid III sample, and gold nanoparticles may be gradually precipitated on the surface of the reaction vessel. If the reaction vessel is used again to prepare the next batch of conductive aramid, the efficiency of the metallization on the surface of the sample will be seriously reduced, and the metal coating will gradually appear on the surface of the reaction vessel and become thicker, which is not conducive to large-scale production. Therefore, the performance of the conductive aramid obtained by the preparation example that controls the third time to 3-5 hours is more excellent.

[0061] From the results of Preparation Examples 6 and 7, maintaining the second time for a longer time (eg, 20 minutes) can further ensure the conductive performance of the conductive aramid.

[0062] From the results of Preparation Examples 4 and 5, the first time of Preparation Example 4 is one hour less than that of Preparation Example 5, but the overall performance is relatively excellent as can be observed from the energy spectrum analysis diagram of the scanning electron microscope, the mechanical properties data and the resistivity data. Therefore, the mechanical properties of the aramid sample can be maintained while the excellent conductivity is given to the aramid sample by controlling the ratio of the first time to the third time.

[0063] The results of Preparation Examples 5 to 8 show that the temperature of step S104 has a great influence on the conductive properties of the aramid sample. Reaction at low temperature will result in the inability to smoothly form a metal coating on the surface of the aramid sample, seriously affecting its conductive properties.

[0064] As described above, the method provided by the present invention does not require roughening treatment of the aramid sample. Through amide group modification, residual modification liquid treatment, metal nanolayer preparation, and chemical deposition metal layer plating, the surface of the aramid sample is stably combined with the nano-gold layer, and the metal layer is not easy to fall off. The overall process is simple and easy, easy to operate, economical and environmentally friendly, and easy to achieve large-scale production. At the same time, it has almost no effect on the mechanical properties of the aramid sample, maintaining the original strength and performance of the aramid sample.

[0065] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation modes, which are merely illustrative rather than restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the present invention and the claims, all of which are within the protection of the present invention.

Claims

1. A method for preparing conductive aramid fiber, characterized in that: The following steps are involved: S101 performing a first treatment on the aramid sample so that the aramid sample remains in a slightly bent state, thereby obtaining a first aramid, wherein the first treatment specifically comprises stretching the aramid sample to a second length, wherein the second length comprises 70%-90% of the first length of the aramid sample; S102 soaking the first aramid fiber in a chloroauric acid solution for a first time and subjecting the first aramid fiber to a second treatment to obtain a second aramid fiber, wherein the second treatment comprises ultrasound or vibration; S103 soaking the second aramid fiber in a reducing agent for a second time and performing a second treatment on the second aramid fiber to obtain a third aramid fiber; S104 soaking the third aramid fiber in the first reaction liquid for a third time to obtain a fourth aramid fiber, namely the conductive aramid fiber; Wherein, the aramid sample is aramid III fiber; the third time includes 3-5 hours, and the ratio of the first time to the third time includes 0.4 - 1:

1.

2. The preparation method according to claim 1, characterized in that The aramid fiber samples are bundled yarn samples and / or monofilament samples.

3. The preparation method according to claim 1, characterized in that The ratio of the first time to the third time is 0.6-1:

1.

4. The preparation method according to claim 1, characterized in that: The first time period includes 1-3 hours.

5. The preparation method according to claim 2, characterized in that: When the aramid sample is the bundled yarn sample, the bundled yarn sample is composed of at least 2 aramid monofilaments.

6. The preparation method according to claim 1, characterized in that: The reducing agent includes sodium borohydride.

7. The preparation method according to claim 1, characterized in that: The second time period comprises 5-20 minutes.

8. The preparation method according to claim 7, characterized in that: In step S103, the time of the second process is the same as the second time.

9. The preparation method according to claim 1, characterized in that: The first reaction solution comprises components of water, anhydrous sodium sulfite, formaldehyde and sodium gold sulfite.

10. The conductive aramid fiber prepared by the preparation method according to claims 1 to 9.

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