Blended conductive yarn and preparation method thereof

Abstract

The invention relates to a blended conductive yarn and a preparation method thereof. During preparation, conductive fibers and insulated clothing fibers are used as raw materials, and the blended conductive yarn is prepared by adopting a double-feeding double-carding rotor spinning process; in the raw materials, the content of the conductive fibers is 5-10 wt%; the conductivity-softness-strength index W of the blended conductive yarn is 1.7-19.85 (10cm < 2 >) / (omegag); the conductive fibers in the blended conductive yarn gather in the yarn and are distributed in a three-dimensional spiral shape in the axial direction of the yarn to form a continuous conductive path, and the conductive fibers are tightly surrounded and wrapped by the insulated garment fibers. According to the preparation method disclosed by the invention, the control on the conductivity of the yarn is realized by accurately adjusting the mixing ratio of the conductive fibers to the insulated clothing fibers and the fineness of the yarn; the blended conductive yarn can achieve high conductivity under the condition of low initial modulus, and meanwhile the breaking strength is considered.

Description

Technical Field

[0001] The invention belongs to the field of novel textile technology and relates to a blended conductive yarn and a preparation method thereof. Background Art

[0002] With the rapid development of smart wearable devices and electronic textiles, the demand for conductive yarns is growing. Conductive yarns can not only provide anti-static and electromagnetic shielding functions, but can also be used as sensors and conductive connections in smart textiles. However, the conductive yarns prepared by the prior art have problems such as unsatisfactory conductivity and spinnability, stiff feel, and poor stability.

[0003] First, in the prior art, conductive filaments are not suitable for direct use in the weaving process due to their physical properties. Usually, the preparation of conductive yarns uses a specific spinning process, using the conductive filaments as core yarns or wrapping them with insulating fibers on the outside of the yarns, so as to produce yarns that are both conductive and suitable for weaving. For example, patent CN 214882054U discloses an antistatic yarn, in which the core yarn is twisted by several strands of chemical fiber filaments, and several strands of twisted conductive filaments are spirally wound on the core yarn. The outermost layer is a protective covering yarn, and this yarn has a certain antistatic function. However, in actual application, since the elongation at break of the conductive filaments is usually lower than that of other components in the yarn, this causes the conductive filaments to easily separate from other structures of the yarn or delaminate when subjected to stretching, bending or other mechanical stresses, affecting the conductivity and structural stability of the yarn.

[0004] Secondly, the conductive yarn in the prior art has the following deficiencies in terms of comprehensive performance of conductivity, softness and breaking strength:

[0005] (1) Reference 1 (Electrical and mechanical properties of poly(trimethylene terephthalate) / polyaniline composite conductive yarn [J]. Journal of Textile Research, 2017, 38(02): 40-46) reported a method for preparing a composite conductive yarn. The method used 17 tex poly(trimethylene terephthalate) filament as the substrate and obtained a conductive yarn with an initial modulus of 25.74 cN / dtex through in-situ polymerization of aniline. This is the lowest initial modulus that can be achieved by conductive yarn in the public reports so far. The breaking strength of the yarn is 33.29 cN / tex and the mass resistivity is 25.16 Ω•g / cm 2 , after calculation, W=0.05, it is difficult to achieve high conductivity and breaking strength at low initial modulus. This conductive yarn is superior in softness, but has a large mass specific resistance and poor conductivity. In addition, the conductive molecules of the conductive yarn are attached to the surface of the yarn, lacking insulation effect and easy to wear. It needs to be further compounded with insulating fibers to have practical value.

[0006] (2) Reference 2 (Application of graphene in improving the conductivity of polyaniline / aramid composite yarn [J]. Printing and Dyeing, 2022, 48(02): 45-48+72.) reported a method for preparing a composite conductive yarn. This method uses 104 tex aramid filament yarn as the substrate and graphene as the conductive reinforcing filler to prepare a graphene@polyaniline / aramid composite conductive yarn with a breaking strength of 160.5 cN / tex, which is the highest breaking strength that can be achieved by conductive yarn in the public reports so far. The mass resistivity of the yarn is 0.58 Ω•g / cm 2 , the initial modulus is 664.9 cN / dtex, and the calculated conductivity-softness-strength index W=0.42. This conductive yarn has excellent strength performance, but the initial modulus of the yarn is high, resulting in excessive yarn stiffness, stiff feel and unsuitable for weaving into fabrics.

[0007] (3) Reference 3 (Study on the Electromagnetic Radiation Protection of Stainless Steel Fiber Blended Fabrics [D]. Zhejiang Sci-Tech University, 2019.) Using ring spinning technology, polyester and stainless steel staple fibers were used as raw materials to prepare 60.8 tex polyester / stainless steel staple fiber blended yarn, in which the mass content of conductive stainless steel fiber was 27%. The mass resistivity of this conductive yarn is 0.08Ω•g / cm2, which is the minimum mass resistivity that can be achieved by blended conductive yarn in public reports. The breaking strength of this yarn is 21.30 cN / dtex, the initial modulus is 163.60 cN / dtex, and the calculated conductivity-softness-strength index W=1.55. The poor elasticity of stainless steel fiber makes the initial modulus of the yarn higher, and the high content of stainless steel fiber in this yarn increases the production cost; at the same time, the internal and external transfer of fibers is a typical feature of ring yarn. The internal and external transfer of stainless steel fibers will lead to uneven distribution of conductive fibers in the yarn, thereby causing fluctuations in conductive properties. During stretching or deformation, the resistance of the yarn changes greatly, which makes it difficult to meet the application requirements of high-precision sensors.

[0008] In summary, the conductive yarns in the prior art have many deficiencies in structural stability, high conductivity, softness and strength, which limit their application in smart textiles and electronic devices.

[0009] Therefore, it is of great significance to study a blended conductive yarn having high conductivity, softness and breaking strength and a preparation method thereof to solve the problems existing in the prior art. Summary of the invention

[0010] The purpose of the present invention is to solve the problems existing in the prior art and provide a blended conductive yarn and a preparation method thereof.

[0011] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0012] A method for preparing a blended conductive yarn, using conductive fiber and insulating clothing fiber as raw materials, and adopting a double-feeding double-combing rotor spinning process to prepare the blended conductive yarn;

[0013] Among the raw materials, the conductive fiber and the insulating fiber are both short fibers, and the content of the conductive fiber is 5-10wt%; when the content of the conductive fiber is lower than 5wt%, due to the insufficient number of conductive fibers, it is impossible to form a continuous arrangement in the yarn, resulting in the breakage of the conductive path in the yarn, which in turn affects the formation of a stable conductive network; when the content of the conductive fiber exceeds 10wt%, as the content of the conductive fiber increases, some of the conductive fibers will migrate to the surface of the yarn, and even worse, some conductive fibers will become wrapped fibers, wrapped in the outer layer of the yarn, and the exposure of the conductive fibers will weaken the surface insulation of the blended conductive yarn, and the uneven distribution of the conductive fibers will also affect the stability of the conductive effect;

[0014] The conductivity-softness-strength index W of the blended conductive yarn is 1.7~19.85, and the conductivity-softness-strength index W is defined as:

[0015] ;

[0016] Where, W is in units of (10•cm 2 ) / (Ω•g); S is the breaking strength, which indicates the maximum tensile force that each tex yarn can withstand. The larger the S is, the higher the strength of the yarn is. The unit is cN / tex; E is the initial modulus, which indicates the ease with which the yarn deforms under a small load and reflects the rigidity of the yarn. The smaller the E is, the softer the yarn is. The unit is cN / dtex; is the mass specific resistance, which indicates the ratio of the voltage per unit length of the conductive yarn to the current flowing through the yarn per unit linear density. The smaller the value, the better the conductivity of the yarn and the more uniform the distribution of the conductive fibers in the yarn. The unit is Ω•g / cm 2 ;

[0017] The blended conductive yarn of the present invention has high conductivity, softness and breaking strength, and a conductivity-softness-strength index W is defined to characterize and evaluate the comprehensive performance of the conductive yarn. The larger W is, the lower the initial modulus (i.e., softer) and the higher the breaking strength of the blended conductive yarn while maintaining high conductivity, thereby indicating that its comprehensive performance is better.

[0018] As the preferred technical solution:

[0019] According to the preparation method of a blended conductive yarn as described above, the length of the conductive fiber is 18~58mm, and the fineness is 1.3~4dtex. If the length of the conductive fiber is less than 18mm, the cohesion between the conductive fibers is weakened, thereby reducing the breaking strength of the yarn; if the length of the conductive fiber is greater than 58mm, the risk of fiber entanglement is increased; if the fineness of the conductive fiber is less than 1.3dtex, the strength of the conductive fiber is too low and it is easy to be cut by the corresponding toothed rack of the combing roller; if the fiber fineness is greater than 4dtex, the coarse fiber is not easy to be combed by the combing roller and it is easy to make the yarn feel stiff and increase the number of yarn defects; insulating clothing The length of the fiber is 18~70mm, and the fineness is 1.3~4dtex. If the length of the fiber is less than 18mm, the entanglement force between the fibers will become smaller, thereby causing the breaking strength of the yarn to become smaller. If the length of the fiber is greater than 70mm, because the insulating clothing fiber is too long, it is not easy to be completely twisted into the yarn body during the twisting process. The part left outside the yarn body is easy to become the hairiness of the yarn, and the length difference with the conductive fiber is too large. The insulating clothing fiber is easy to form wrapped fibers on the surface of the yarn, which will affect the final conductive effect of the yarn; the selection of the fineness range of the insulating clothing fiber is the same as the reason for the conductive fiber.

[0020] In the preparation method of a blended conductive yarn as described above, the conductive fiber is a composite conductive fiber, which is formed by attaching conductive particles or conductive materials to insulating fibers by filling or coating, including but not limited to carbon black / polymer composite conductive fibers, metal / polymer composite conductive fibers, graphite / polymer composite conductive fibers, conductive polymer composite conductive fibers and mixed filler composite conductive fibers; the insulating clothing fiber is one or more of natural fibers and chemical fibers, specifically including but not limited to cotton fibers, polyester fibers and viscose fibers.

[0021] A preparation method for a blended conductive yarn as described above, the specific preparation process is: the conductive fiber and the insulating serving fiber are respectively subjected to the combing and drawing processes to form uniform conductive fiber slivers and insulating serving fiber slivers, the conductive fiber slivers and the insulating serving fiber slivers are respectively drawn out from their respective sliver cans, and then respectively held by their respective feeding rollers and feeding plates, and the mixing ratio of the two fibers is controlled by adjusting the rotation speed of the two feeding rollers; after the two fiber slivers are actively conveyed forward by their respective feeding rollers, they are respectively combed by two independent combing rollers to form two fiber flows, after the two fiber flows are transported through their respective corresponding fiber delivery channels, they respectively enter the condensation groove of the rotor from the fiber outlets of the two fiber delivery channels to form condensed strands, the condensed strands are twisted by the high-speed rotation of the rotor, and then drawn out by the yarn drawing roller and wound into a blended conductive yarn.

[0022] In the above-mentioned method for preparing a blended conductive yarn, the feeding speed of the feeding roller X corresponding to the conductive fiber is recorded as The feeding speed of the feeding roller Y corresponding to the insulating clothing fiber is The linear density of the yarn is , the yarn delivery speed is The mass content of the conductive fiber in the raw material is recorded as x%, the mass content of the insulating fiber in the raw material is recorded as y%; the quantitative content of the conductive fiber strips corresponding to the conductive fiber is The quantity of insulating fiber strips corresponding to the insulating fiber strips is ;in, and The unit is m·min -1 , the unit of T is tex, The unit is m·min -1 , and The unit is g·(5m) -1 ;

[0023] The above parameters satisfy the following formula:

[0024] ;

[0025] ;

[0026] ;

[0027] .

[0028] A method for preparing a blended conductive yarn as described above, The value range is 14~70tex, and The value range is 3~30g·(5m) -1 , The value range is 40~120m·min -1 , The value range is , The value range is .

[0029] In the method for preparing a blended conductive yarn as described above, the rotation speed of the combing roller X corresponding to the conductive fiber is 4000-6000 r·min -1 If the speed of the combing roller corresponding to the conductive fiber is too fast, the friction between the conductive fiber and the combing roller rack will increase, resulting in damage to the conductive fiber, which in turn affects its conductive effect; the speed of the combing roller Y corresponding to the insulating clothing fiber is 4000~9000 r·min -1; Rotor speed is 25000~150000 r·min -1 .

[0030] In the method for preparing a blended conductive yarn as described above, the working angle of the combing roller X is 6° to 9°, the tooth depth is 2.1 to 2.4 mm, and the tooth density is 12 to 16 teeth / (25.4 mm). 2 ;

[0031] Working angle, tooth depth and tooth density are all professional terms; working angle refers to the angle between the rack on the combing roller and the horizontal plane. When the working angle α is within this range, the ability of the needle teeth to penetrate the fiber layer becomes stronger, the fiber can be easily grabbed, the combing quality is improved, and the damage to the conductive particles or conductive materials of the conductive fiber is reduced; tooth depth refers to the depth of each tooth on the combing roller. When the tooth depth is within this range, the efficiency of fiber transfer from the needle teeth can be improved; tooth density refers to the number of teeth per unit area. When the tooth density is within this range, although the combing efficiency is reduced, the probability of contact between the conductive fiber and the needle teeth is reduced, which is beneficial to reduce fiber damage.

[0032] Rotor spinning is an efficient short-staple spinning technology suitable for large-scale production. The combing roller is one of the key components of rotor spinning. It combs the fiber strips to break them into single fibers, making it easier for the fibers to condense in the rotor. Reference 4 (Optimization of key equipment and process for rotor spinning of polyester-cotton blended yarn [J]. Textile Equipment, 2024, 51(04): 11-16.) analyzes the influence of the main process parameters of the combing roller rack on the performance of rotor yarn. At present, the tooth depth of the traditional combing roller rack is generally 2.5mm, the working angle is small (10°~40°) and the tooth density is high (greater than 18.56 teeth / (25.4mm) 2), the needle teeth have a strong ability to penetrate the fiber layer, which is suitable for processing conventional fibers, but it is easy to cause damage to conductive fibers with conductive particles. Patent CN113604923A discloses a composite conductive core-spun yarn and a preparation method thereof. This technology combs the graphene / silver / cotton composite conductive fiber into a fiber flow through a combing roller, and then feeds it into a rotor through a fiber delivery channel, and spins it into a conductive core-spun yarn together with the introduced filament in a rotor spinning machine. However, during the combing process, the conductive particles on the conductive fiber are prone to friction with the closely arranged sharp teeth of the combing roller, causing fiber damage and affecting the conductive properties of the yarn. In addition, patent CN103911695A discloses a double-feeding double-combing rotor spinning device, which is equipped with a set of "feeding roller-combing roller-fiber delivery channel" mechanism on the basis of the traditional rotor spinning machine, which can realize the independent feeding, combing and delivery of two short fibers. The spinning device is suitable for spinning rotor blended yarn. Therefore, how to use rotor spinning technology to prepare highly conductive, soft and strong conductive yarns is still a technical challenge. The present invention adopts a double-feed double-combing rotor spinning process and designs the main process parameters of the combing roller X rack corresponding to the conductive fiber to successfully prepare a blended conductive yarn with high conductivity, softness and breaking strength.

[0033] The present invention also provides a blended conductive yarn prepared by the preparation method as described in any of the above items. The conductive fibers in the blended conductive yarn are gathered in the yarn and distributed in a three-dimensional spiral shape along the axial direction of the yarn to form a continuous conductive path, thereby giving the yarn excellent conductive properties. At the same time, the insulating clothing fibers tightly surround and wrap the conductive fibers, which not only provides the necessary physical and mechanical support for the yarn, but also enhances the softness of the yarn, while effectively protecting the conductive fibers from external damage.

[0034] The insulating clothing fibers with a higher content tightly surround and wrap the conductive fibers, which not only provide the necessary physical and mechanical support for the yarn, but also increase the softness of the yarn and effectively protect the conductive fibers from damage. Compared with core-wrapped or wrapped conductive yarns, the conductive material is more likely to separate or delaminate from other structures in the yarn, resulting in unstable conductive performance and shortened service life. The conductive fibers and the insulating clothing fibers in the blended conductive yarn involved in the present invention are both short fibers, which are tightly entangled on the fiber scale. The cohesive force between the fibers significantly enhances the stability of the conductive fibers, making it difficult for them to separate from the yarn structure. Therefore, this blended conductive yarn can achieve high conductivity at a low initial modulus while taking into account the breaking strength, providing a more durable and stable conductive solution for the application of clothing fabrics and smart textiles.

[0035] The blended conductive yarn produced by ring spinning technology has a compact structure. Both the conductive fiber and the insulating clothing fiber are mostly transferred inward and outward in the form of conical spirals, so that the fibers are entangled and connected with each other in the yarn. However, this fiber transfer inward and outward may lead to uneven distribution of the conductive fiber in the yarn, especially when the conductive fiber content is low. This unevenness may cause fluctuations in the conductive properties of the yarn. During stretching or deformation, the resistance of the yarn changes greatly, which makes it difficult to meet the application requirements of high-precision sensors.

[0036] The unique structure of the blended conductive yarn involved in the present invention is attributed to the fact that during the high-speed rotation of the rotor, the conductive fibers and the insulating clothing fibers fed into the spinning machine at different feeding speeds enter the rotor at different points, resulting in differences in the arrangement of the fibers in the whiskers in the condensation groove, and thus making the distribution of the two fibers in the final yarn present a unique structure. The conductive fibers with a lower content are continuous and spirally distributed along the axis of the yarn, building a stable conductive network; while the insulating clothing fibers with a higher content tightly wrap these conductive fibers, providing the yarn with the necessary physical properties and flexibility. This structural design enables the conductive yarn to not only have excellent conductive properties, but also good mechanical strength and softness, making it very suitable for use in flexible smart wearable fabrics, meeting the dual needs of modern smart textiles for conductive properties and comfort.

[0037] Beneficial effects:

[0038] (1) A method for preparing a blended conductive yarn of the present invention, wherein the raw materials for preparing the yarn include conductive fibers and insulating serving fibers, and the yarn is spun by a double-feed double-combing rotor spinning process; after the conductive fibers are combed by a modified combing roller, the fiber damage rate is reduced; low-content conductive fibers are aggregated inside the yarn and spread out in a three-dimensional spiral form along the axial direction of the yarn to form a continuous conductive path, thereby ensuring the conductive performance of the yarn; and high-content insulating serving fibers tightly wrap the conductive fibers to provide necessary mechanical support, enhance the softness of the yarn, and protect the conductive fibers from potential damage at the physical level.

[0039] (2) A method for preparing a blended conductive yarn of the present invention optimizes the design of the rack structure parameters of the combing roller X to adapt to the characteristics of the conductive fiber, thereby reducing the damage rate of the conductive fiber during the combing process; by accurately adjusting the mixing ratio of the conductive fiber and the insulating clothing fiber and the fineness of the yarn, the conductive performance of the yarn is controlled to adapt to diverse application requirements; this control mechanism provides greater flexibility for the design of the conductive yarn, enabling it to meet the needs of specific application scenarios.

[0040] (3) The blended conductive yarn prepared by the method of the present invention can achieve high conductivity and break strength at a low initial modulus, and performs well in conductivity, wearability and structural stability, providing a long-lasting and stable conductive functional solution for clothing fabrics and smart wearable textiles, meeting the needs of modern technology for conductive materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 is a schematic diagram of the blended conductive yarn of the present invention;

[0042] Figure 2 It is a working schematic diagram of the rotor spinning machine of the present invention;

[0043] Figure 3 is a schematic diagram of the tooth bar of the opening roller; wherein, α is the working angle, i.e., the angle between the tooth bar on the opening roller and the horizontal plane; l is the tooth depth, which refers to the depth of each tooth on the opening roller;

[0044] Figure 4 This is a diagram showing the specific distribution of the silver-plated nylon conductive fiber in the yarn of Example 1; the specific distribution of the silver-plated nylon conductive fiber in the yarn of Example 1 was photographed using an OK_AC5067 industrial camera produced by Beijing Jiaheng Zhongzi Image Technology Co., Ltd.;

[0045] Among them, 1-conductive fiber sliver, 2-insulated clothing fiber sliver, 3-feeding roller X, 4-feeding roller Y, 5-combing roller X, 6-combing roller Y, 7-fiber delivery channel X, 8-fiber delivery channel Y, 9-rotor, 10-yarn drawing roller, 11-blended conductive yarn, 12-conductive fiber, 13-insulated clothing fiber. DETAILED DESCRIPTION

[0046] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms fall within the scope limited by the appended claims of the application equally.

[0047] The specific sources of the materials used in the examples and comparative examples of the present invention are as follows:

[0048] Silver-plated nylon conductive fiber: the manufacturer is Qingdao Hengtong Weiye Special Fabric Technology Co., Ltd.;

[0049] Polyester fiber: The manufacturer is Zhejiang Hengyi Group Co., Ltd.

[0050] Composite carbon black conductive fiber: the manufacturer is Kaitai Special Fiber Technology Co., Ltd.;

[0051] Cotton fiber: The manufacturer is China Color Cotton (Group) Co., Ltd.

[0052] Composite polyaniline conductive fiber: The manufacturer is Foshan Ruinengda Special Material Technology Co., Ltd.

[0053] Viscose fiber: The manufacturer is Xinjiang Zhongtai Chemical Co., Ltd.

[0054] Composite graphene conductive fiber: the manufacturer is Hangzhou Gaoxun Technology Co., Ltd.;

[0055] Recycled cotton fiber: The manufacturer is China Color Cotton (Group) Co., Ltd.

[0056] The test methods involved in the performance indicators in the embodiments and comparative examples of the present invention are as follows:

[0057] Mass specific resistance: Refer to standard DB41 / T 1790-2019 to test yarn mass specific resistance ρ m The specific meaning of mass specific resistance is the ratio of the voltage per unit length of the conductive yarn to the current flowing through the yarn per unit linear density, and the unit is Ω•g / cm 2 , ρ m The length and linear density of the conductive yarn are taken into consideration comprehensively, so this index can evaluate the conductive properties of conductive yarns of different finenesses and the uniformity of the distribution of conductive fibers in the yarn.

[0058] Breaking strength S and initial modulus E: The breaking strength S and initial modulus E of the yarn are tested according to standard GBT 3916-2013. The units of breaking strength S and initial modulus E are cN / tex and cN / dtex respectively.

[0059] In the embodiment, the conductive yarn is characterized by the tracer fiber technology to characterize the distribution morphology of the conductive fibers therein. The basic principle of the tracer fiber method is to place the blended conductive yarn in a solution whose optical refractive index is equal to the average refractive index of the insulating clothing fiber. The insulating clothing fiber in the yarn is basically transparent. The solution is prepared by mixing turpentine and α-bromonaphthalene (the volume ratio of the two is 1:1). Finally, the conductive yarn immersed in the solution is observed under a microscope, and the distribution morphology of the conductive fibers in the yarn can be observed.

[0060] Example 1

[0061] A method for preparing a blended conductive yarn, the specific steps are as follows:

[0062] (1) Preparation of raw materials:

[0063] Conductive fiber: Silver-coated nylon conductive fiber is formed by attaching silver-coated particles (particle size 223 nm) to nylon fiber by coating; the conductive fiber length is 38 mm and the fineness is 1.67 dtex;

[0064] Insulating clothing fiber: polyester fiber; length 38mm, fineness 1.38dtex;

[0065] (2) If Figure 2 As shown, the conductive fiber 12 and the insulating fiber for clothing 13 are respectively formed into uniform conductive fiber slivers 1 and insulating fiber for clothing slivers 2 after the combing and drawing processes. The conductive fiber slivers 1 and the insulating fiber for clothing slivers 2 are respectively drawn out from their respective sliver cans and then held by the feeding rollers X3 and Y4 and the feeding plate respectively; after the two fiber slivers are actively transported forward by their respective feeding rollers, they are respectively combed by independent combing rollers X5 and Y6 to form two fiber streams, and after the two fiber streams are transported through the corresponding fiber delivery channels X7 and Y8, they enter the condensation groove of the rotor 9 from the fiber outlets of the two fiber delivery channels to form condensed strands, and the condensed strands are twisted by the high-speed rotation of the rotor 9 and then drawn out by the yarn drawing roller 10 and wound into a blended conductive yarn 11;

[0066] The feeding speed of the feeding roller X3 corresponding to the conductive fiber 12 is: The feeding speed of the feeding roller Y 4 corresponding to the insulating clothing fiber 13 is The linear density of the yarn is , =40tex, yarn delivery speed is , =75m·min -1 The mass content of the conductive fiber 12 in the raw material is recorded as x%, x=5, and the mass content of the insulating fiber in the raw material is recorded as y%, y=95; the quantitative amount of the conductive fiber strips corresponding to the conductive fiber is , =3.35g·(5m) -1 The quantity of the insulating clothing fiber strip 2 corresponding to the insulating clothing fiber 13 is , =18.86g·(5m) -1 ;according to ,y, ,T, Calculated 0.224m·min -1 , 0.756m·min -1 ;

[0067] The rotating shafts of the feeding roller X and the feeding roller Y are and The rotating speed of the combing roller X corresponding to the conductive fiber is 4500 r·min. -1 The speed of the combing roller Y corresponding to the insulating clothing fiber is 7500r·min -1 ; Rotor speed is 60000 r·min -1 ;like Figure 3 As shown, the working angle of the combing roller X is 8°, the tooth depth is 2.3 mm, and the tooth density is 16 teeth / (25.4 mm) 2 ; The working angle of the combing roller Y is 15°, the tooth depth is 2.7mm, and the tooth density is 61 teeth / (25.4mm) 2 .

[0068] like Figure 1 As shown in the figure, the conductive fibers in the final blended conductive yarn are gathered in the yarn and distributed in a three-dimensional spiral shape along the axial direction of the yarn, forming a continuous conductive path. The insulating clothing fibers tightly surround and wrap the conductive fibers; the breaking strength of the blended conductive yarn is S=13.27cN / tex, the initial modulus is E=35.56cN / dtex, and the mass specific resistivity is =0.22Ω•g / cm 2 , composed of S, E and The calculated conductivity-softness-strength index W is 1.7.

[0069] The prepared blended conductive yarn was immersed in a tracer solution with an optical refractive index equal to the average refractive index of polyester fiber (1.575), and the specific distribution morphology of the silver-plated nylon conductive fiber in the yarn was observed. Figure 4 As shown, the conductive fibers are arranged in a continuous and three-dimensional spiral along the axis of the yarn, forming a unique aggregation structure; the conductive fibers are basically continuously and evenly distributed inside the yarn, ensuring that the yarn can exhibit consistent and continuous conductive properties within all length ranges, and indicating that the yarn can maintain a stable conductive effect throughout its entire length.

[0070] Comparative Example 1

[0071] A spinning method for a blended conductive yarn is basically the same as that of Example 1, except that: the specifications of the combing roller X for the conductive fiber are consistent with those of the combing roller Y for processing the insulating clothing fiber, specifically, the working angle α=15°, the tooth depth l=2.7mm, and the tooth density=61 teeth / (25.4mm) 2 .

[0072] The final blended conductive yarn has a mass specific resistance of 12.75Ω•g / cm 2; Breaking strength is 8.79 cN / tex; Initial modulus is 34.19 cN / dtex; W=0.02.

[0073] By comparing Comparative Example 1 with Example 1, it can be found that the mass specific resistance of the blended conductive yarn in Comparative Example 1 becomes larger, and the breaking strength and initial modulus become smaller, indicating that the conductive fibers are damaged to varying degrees during the combing process, affecting the conductive properties, softness and strength of the yarn to varying degrees.

[0074] Comparative Example 2

[0075] A spinning method for a blended conductive yarn is basically the same as that of Example 1, except that: the blended conductive yarn is spun by ring spinning, and the fiber strips formed by two fiber raw materials after roving drafting are introduced by the rotation of a ring wire ring, and the winding speed of the bobbin exceeds that of the wire ring, so that the two rovings can be twisted to form a blended conductive yarn;

[0076] The specific process parameters are as follows: spindle speed is 4000 rpm, rear zone drafting multiple is 1.10; roller spacing is 45*55mm; upper and lower pin jaw spacing is 5.5mm.

[0077] The final mass specific resistance test result is 19.45Ω•g / cm 2 ; Breaking strength is 14.07 cN / tex; Initial modulus is 38.23 cN / dtex; W=0.02.

[0078] By comparing Comparative Example 1 with Example 1, it can be found that when the spinning method is changed to ring spinning, the mass specific resistance, breaking strength and initial modulus of the blended conductive yarn of Comparative Example 2 are increased, among which the mass specific resistance increases significantly, indicating that the conductive performance of the yarn is deteriorating, and the parameter W becomes smaller, indicating that the comprehensive performance of the blended conductive yarn is deteriorating.

[0079] Example 2

[0080] A method for preparing a blended conductive yarn, which is basically the same as that of Example 1, except that the linear density of the yarn is 42.5tex, corresponding to the calculated 0.238m·min -1 , 0.803m·min -1 .

[0081] The mass specific resistance of the final blended conductive yarn 0.19Ω•g / cm 2 , the breaking strength S is 13.52cN / tex; the initial modulus E is 38.09cN / dtex; S, E and The calculated conductivity-softness-strength index W=1.87.

[0082] Example 3

[0083] A method for preparing a blended conductive yarn, the specific steps are as follows:

[0084] (1) Preparation of raw materials:

[0085] Conductive fiber: Composite carbon black conductive fiber is formed by attaching carbon black (particle size 45 nm) to polyester fiber by filling method; the conductive fiber length is 42mm and the fineness is 3.2dtex;

[0086] Insulating clothing fiber: cotton fiber; length 28mm, fineness 1.32dtex;

[0087] (2) The conductive fiber and the insulating fiber for use are respectively formed into uniform conductive fiber slivers and insulating fiber slivers for use after being combed and drawn. The conductive fiber slivers and the insulating fiber slivers for use are respectively drawn out from their respective sliver cans and then held by their respective feeding rollers and feeding plates. After the two fiber slivers are actively transported forward by their respective feeding rollers, they are respectively combed by two independent combing rollers to form two fiber streams. After the two fiber streams are transported through their respective corresponding fiber delivery channels, they enter the condensation groove of the rotor from the fiber outlets of the two fiber delivery channels to form condensed strands. The condensed strands are twisted by the high-speed rotation of the rotor and then drawn out by the yarn drawing roller and wound into a blended conductive yarn.

[0088] The feeding speed of the feeding roller corresponding to the conductive fiber is The feeding speed of the feeding roller corresponding to the insulating clothing fiber is The linear density of the yarn is , =17tex, yarn delivery speed is , =68m·min -1 The mass content of the conductive fiber in the raw material is recorded as x%, x=10, and the mass content of the insulating fiber in the raw material is recorded as y%, y=90; the quantitative amount of the conductive fiber strips corresponding to the conductive fiber is , =9.9g·(5m) -1 The quantity of insulating fiber strips corresponding to the insulating fiber strips is =20.3g·(5m) -1 ;according to ,y, , ,T, Calculated 0.0584m·min-1 , 0.2563m·min -1 ;

[0089] The speed of the combing roller X corresponding to the conductive fiber is 4000 r·min -1 The speed of the combing roller Y corresponding to the insulating clothing fiber is 6000r·min -1 ; Rotor speed is 65000 r·min -1 ; The working angle of the combing roller X is 6°, the tooth depth is 2.4mm, and the tooth density is 12.5 teeth / (25.4mm) 2 ; The working angle of the combing roller Y is 12°, the tooth depth is 2.5mm, and the tooth density is 45 teeth / (25.4mm) 2 .

[0090] The conductive fibers in the final blended conductive yarn are gathered in the yarn and distributed in a three-dimensional spiral along the axial direction of the yarn, forming a continuous conductive path. The insulating clothing fibers tightly surround and wrap the conductive fibers; the breaking strength of the blended conductive yarn is S=10.15cN / tex, the initial modulus is E=24.86cN / dtex, and the mass specific resistivity is =0.07Ω•g / cm 2 , composed of S, E and The calculated conductivity-softness-strength index W is 5.83.

[0091] Example 4

[0092] A method for preparing a blended conductive yarn, the specific steps are as follows:

[0093] (1) Preparation of raw materials:

[0094] Conductive fiber: Composite polyaniline conductive fiber is formed by attaching polyaniline (particle size 200 nm) to polyester fiber by filling method; the conductive fiber length is 58mm and the fineness is 4dtex;

[0095] Insulating clothing fiber: polyester fiber; length 70mm, fineness 4dtex;

[0096] (2) The conductive fiber and the insulating fiber for use are respectively formed into uniform conductive fiber slivers and insulating fiber slivers for use after being combed and drawn. The conductive fiber slivers and the insulating fiber slivers for use are respectively drawn out from their respective sliver cans and then held by their respective feeding rollers and feeding plates. After the two fiber slivers are actively transported forward by their respective feeding rollers, they are respectively combed by two independent combing rollers to form two fiber streams. After the two fiber streams are transported through their respective corresponding fiber delivery channels, they enter the condensation groove of the rotor from the fiber outlets of the two fiber delivery channels to form condensed strands. The condensed strands are twisted by the high-speed rotation of the rotor and then drawn out by the yarn drawing roller and wound into a blended conductive yarn.

[0097] The feeding speed of the feeding roller corresponding to the conductive fiber is The feeding speed of the feeding roller corresponding to the insulating clothing fiber is The linear density of the yarn is , =35tex, yarn delivery speed is , =40m·min -1 The mass content of the conductive fiber in the raw material is recorded as x%, x=6, and the mass content of the insulating fiber in the raw material is recorded as y%, y=94; the quantitative amount of the conductive fiber strips corresponding to the conductive fiber is , =30g·(5m) -1 The quantity of insulating fiber strips corresponding to the insulating fiber strips is =30g·(5m) -1 ;according to ,y, , ,T, Calculated 0.014m·min -1 , 0.2193m·min -1 ;

[0098] The speed of the combing roller X corresponding to the conductive fiber is 5000 r·min -1 The speed of the combing roller Y corresponding to the insulating clothing fiber is 4000r·min -1 ; Rotor speed is 25000 r·min -1 ; The working angle of the combing roller X is 7°, the tooth depth is 2.1mm, and the tooth density is 12 teeth / (25.4mm) 2 ; The working angle of the combing roller Y is 15°, the tooth depth is 2.7mm, and the tooth density is 65 teeth / (25.4mm) 2 .

[0099] The conductive fibers in the final blended conductive yarn are gathered in the yarn and distributed in a three-dimensional spiral along the axial direction of the yarn, forming a continuous conductive path. The insulating clothing fibers tightly surround and wrap the conductive fibers; the breaking strength of the blended conductive yarn is S = 11.84 cN / tex, the initial modulus is E = 30.27 cN / dtex, and the mass specific resistivity is =0.15Ω•g / cm 2 , composed of S, E and The calculated conductivity-softness-strength index W is 2.61.

[0100] Example 5

[0101] A method for preparing a blended conductive yarn, the specific steps are as follows:

[0102] (1) Preparation of raw materials:

[0103] Conductive fiber: Silver-coated polyester conductive fiber is formed by attaching silver-coated particles (particle size 223 nm) to polyester fibers by coating; the conductive fiber length is 18 mm and the fineness is 1.3 dtex;

[0104] Insulating clothing fiber: viscose fiber; length 38mm, fineness 1.36dtex;

[0105] (2) The conductive fiber and the insulating fiber for use are respectively formed into uniform conductive fiber slivers and insulating fiber slivers for use after being combed and drawn. The conductive fiber slivers and the insulating fiber slivers for use are respectively drawn out from their respective sliver cans and then held by their respective feeding rollers and feeding plates. After the two fiber slivers are actively transported forward by their respective feeding rollers, they are respectively combed by two independent combing rollers to form two fiber streams. After the two fiber streams are transported through their respective corresponding fiber delivery channels, they enter the condensation groove of the rotor from the fiber outlets of the two fiber delivery channels to form condensed strands. The condensed strands are twisted by the high-speed rotation of the rotor and then drawn out by the yarn drawing roller and wound into a blended conductive yarn.

[0106] The feeding speed of the feeding roller corresponding to the conductive fiber is The feeding speed of the feeding roller corresponding to the insulating clothing fiber is The linear density of the yarn is , =70tex, yarn delivery speed is , =120m·min -1 The mass content of the conductive fiber in the raw material is recorded as x%, x=7, and the mass content of the insulating fiber in the raw material is recorded as y%, y=93; the quantitative amount of the conductive fiber strips corresponding to the conductive fiber is , =3g·(5m) -1 The quantity of insulating fiber strips corresponding to the insulating fiber strips is =18.53g·(5m) -1 ;according to ,y, , ,T, Calculated 0.977m·min -1 , 2.1m·min -1 ;

[0107] The speed of the combing roller X corresponding to the conductive fiber is 6000 r·min -1 The speed of the combing roller Y corresponding to the insulated clothing fiber is 9000r·min -1 ; Rotor speed is 150000 r·min -1 ; The working angle of the combing roller X is 6°, the tooth depth is 2.2mm, and the tooth density is 14 teeth / (25.4mm) 2 ; The working angle of the combing roller Y is 12°, the tooth depth is 2.5mm, and the tooth density is 45 teeth / (25.4mm) 2 .

[0108] The conductive fibers in the final blended conductive yarn are gathered in the yarn and distributed in a three-dimensional spiral along the axial direction of the yarn, forming a continuous conductive path. The insulating clothing fibers tightly surround and wrap the conductive fibers; the breaking strength of the blended conductive yarn is S=17.33cN / tex, the initial modulus is E=42.18cN / dtex, and the mass specific resistivity is =0.11Ω•g / cm 2 , composed of S, E and The calculated conductivity-softness-strength index W is 3.74.

[0109] Example 6

[0110] A method for preparing a blended conductive yarn, the specific steps are as follows:

[0111] (1) Preparation of raw materials:

[0112] Conductive fiber: Composite graphene conductive fiber is formed by attaching graphene (particle size 2.3μm) to polyester fiber by coating; the conductive fiber length is 38mm and the fineness is 2.5dtex;

[0113] Insulating clothing fiber: recycled cotton fiber; length 18mm, fineness 1.3dtex;

[0114] (2) The conductive fiber and the insulating fiber for use are respectively formed into uniform conductive fiber slivers and insulating fiber slivers for use after being combed and drawn. The conductive fiber slivers and the insulating fiber slivers for use are respectively drawn out from their respective sliver cans and then held by their respective feeding rollers and feeding plates. After the two fiber slivers are actively transported forward by their respective feeding rollers, they are respectively combed by two independent combing rollers to form two fiber streams. After the two fiber streams are transported through their respective corresponding fiber delivery channels, they enter the condensation groove of the rotor from the fiber outlets of the two fiber delivery channels to form condensed strands. The condensed strands are twisted by the high-speed rotation of the rotor and then drawn out by the yarn drawing roller and wound into a blended conductive yarn.

[0115] The feeding speed of the feeding roller corresponding to the conductive fiber is The feeding speed of the feeding roller corresponding to the insulating clothing fiber is The linear density of the yarn is , =50tex, yarn delivery speed is , =70m·min -1 The mass content of the conductive fiber in the raw material is recorded as x%, x=8.5, and the mass content of the insulating fiber in the raw material is recorded as y%, y=91.5; the quantitative amount of the conductive fiber strips corresponding to the conductive fiber is , =5.65g·(5m) -1 The quantity of insulating fiber strips corresponding to the insulating fiber strips is =3g·(5m) -1 ;according to ,y, , ,T, Calculated 0.263m·min -1 , 5.33m·min -1 ;

[0116] The speed of the combing roller X corresponding to the conductive fiber is 4000 r·min -1 The speed of the combing roller Y corresponding to the insulating clothing fiber is 4000r·min -1 ; Rotor speed is 70000 r·min -1 ; The working angle of the combing roller X is 9°, the tooth depth is 2.4mm, and the tooth density is 13 teeth / (25.4mm) 2 ; The working angle of the combing roller Y is 12°, the tooth depth is 2.5mm, and the tooth density is 45 teeth / (25.4mm) 2 .

[0117] The conductive fibers in the final blended conductive yarn are gathered in the yarn and distributed in a three-dimensional spiral along the axial direction of the yarn, forming a continuous conductive path. The insulating clothing fibers tightly surround and wrap the conductive fibers; the breaking strength of the blended conductive yarn is S=14.18cN / tex, the initial modulus is E=23.81cN / dtex, and the mass specific resistivity is =0.03Ω•g / cm 2 , composed of S, E and The calculated conductivity-softness-strength index W is 19.85.

Claims

1. A method for preparing a blended conductive yarn, characterized in that: Conductive fiber and insulating clothing fiber are used as raw materials, and the blended conductive yarn is prepared by double-feed double-combing rotor spinning process. In the raw materials, the content of conductive fiber is 5~10wt%; The conductivity-softness-strength index W of the blended conductive yarn is 1.7~19.85, and the conductivity-softness-strength index W is defined as: ； Where, W is in units of (10•cm 2 ) / (Ω•g); S is the breaking strength, in cN / tex; E is the initial modulus, in cN / dtex; is the mass specific resistance, unit is Ω•g / cm 2 .

2. The method for preparing a blended conductive yarn according to claim 1, characterized in that: The length of the conductive fiber is 18~58mm and the fineness is 1.3~4dtex; the length of the insulating clothing fiber is 18~70mm and the fineness is 1.3~4dtex.

3. The method for preparing a blended conductive yarn according to claim 1, characterized in that: The conductive fiber is a composite conductive fiber, which is formed by attaching conductive particles or conductive materials to insulating fibers by filling or coating; the insulating clothing fiber is one or more of natural fibers and chemical fibers.

4. The method for preparing a blended conductive yarn according to claim 1, characterized in that: The specific preparation process is as follows: the conductive fiber and the insulating serving fiber are respectively formed into uniform conductive fiber slivers and insulating serving fiber slivers after combing and drawing processes; the conductive fiber slivers and the insulating serving fiber slivers are respectively drawn out from their respective sliver cans, and then held by their respective feeding rollers and feeding plates; after the two fiber slivers are actively transported forward by their respective feeding rollers, they are respectively combed by two independent combing rollers to form two fiber flows; after the two fiber flows are transported through their respective corresponding fiber delivery channels, they enter the condensation groove of the rotor from the fiber outlets of the two fiber delivery channels to form condensed whiskers; the condensed whiskers are twisted by the high-speed rotation of the rotor, drawn out by the yarn drawing roller and wound into a blended conductive yarn.

5. The method for preparing a blended conductive yarn according to claim 4, characterized in that: The feeding speed of the feeding roller corresponding to the conductive fiber is The feeding speed of the feeding roller corresponding to the insulating clothing fiber is The linear density of the yarn is , the yarn delivery speed is The mass content of the conductive fiber in the raw material is recorded as x%, the mass content of the insulating fiber in the raw material is recorded as y%; the quantitative content of the conductive fiber strips corresponding to the conductive fiber is The quantity of insulating fiber strips corresponding to the insulating fiber strips is ;in, and The unit is m·min -1 , the unit of T is tex, The unit is m·min -1 , and The unit is g·(5m) -1 ; Parameters x, y, , , , , and Satisfies the following formula: ； 。 6. The method for preparing a blended conductive yarn according to claim 5, characterized in that: The value range is 14~70tex, and The value range is 3~30g·(5m) -1 , The value range is 40~120m·min -1 , The value range is , The value range is .

7. The method for preparing a blended conductive yarn according to claim 6, characterized in that: The speed of the combing roller X corresponding to the conductive fiber is 4000~6000 r·min -1 The speed of the combing roller Y corresponding to the insulating clothing fiber is 4000~9000 r·min -1 ; Rotor speed is 25000~150000 r·min -1 .

8. The method for preparing a blended conductive yarn according to claim 7, characterized in that: The working angle of the combing roller X is 6°~9°, the tooth depth is 2.1~2.4mm, and the tooth density is 12~16 teeth / (25.4mm) 2 .

9. The blended conductive yarn prepared by the preparation method according to any one of claims 1 to 8, characterized in that: The conductive fibers in the blended conductive yarn are gathered in the yarn and distributed in a three-dimensional spiral along the axial direction of the yarn to form a continuous conductive path, and the insulating clothing fibers tightly surround and wrap the conductive fibers.

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