CN111394843A

CN111394843A - Crimped chinlon conductive filament, manufacturing method and application thereof

Info

Publication number: CN111394843A
Application number: CN201910192301.1A
Authority: CN
Inventors: 周焕民
Original assignee: Jiangsu Zja New Material Co ltd
Current assignee: Jiangsu Zja New Material Co ltd
Priority date: 2019-03-14
Filing date: 2019-03-14
Publication date: 2020-07-10

Abstract

The invention relates to a crimped chinlon conductive filament, a manufacturing method and application thereof. The crimping deformation nylon conductive filament is obtained by carrying out crimping deformation processing on nylon conductive filament and is characterized in that the crimping shrinkage rate is 15-60%, and the crimping stability is 40-90%. The deformation processing process comprises the following steps: heating and plasticizing the conductive fiber protofilament by a deformation hot box, cooling the conductive fiber protofilament by a cooling plate, twisting and untwisting by a false twister, shaping, adding a network, oiling, winding, inspecting and packaging. The crimped chinlon conductive filament is beneficial to subsequent blended weaving processing or is independently used for weaving, can show soft and fluffy human experience effect, and can be widely applied to 1) nerve calming and hypnosis, 2) blood circulation improvement, 3) static electricity removal, 4) dust removal and filtration, 5) mariculture, 6) freshwater culture, 7) negative ion containing water/air preparation, 8) electric heating, 9) low-voltage wires and 10) signal conduction.

Description

Crimped chinlon conductive filament, manufacturing method and application thereof

Technical Field

The invention relates to a crimped chinlon conductive filament, a manufacturing method and application thereof, belonging to the technical field of conductive fibers.

Background

The existing conductive filament has a rigid and smooth surface, has small cohesive force when being blended with other fibers, is easy to generate a fluffing phenomenon, and is not beneficial to processing conductive fiber fabrics. If it is used alone in fabric processing, the fiber feels hard, resulting in poor wearability. If such a fabric sock is used, the conductive layer portion may be peeled off by the influence of pressure and friction for a long time

Can affect its conductivity and current flow. At the present stage, finished products woven from crimped nylon conductive filaments have not yet appeared on the market.

In chinese patent publication No. 106758179, chemical silver plating is performed on nylon POY fibers to obtain conductive antibacterial fibers, and then texturing (crimping process) is performed to obtain the silver-plated nylon DTY fibers. Discloses a silver plating method of nylon DTY fiber. In chinese patent publication No. 102560729, silver-based antibacterial masterbatch and water-soluble polyester chips are mixed and spun, and a profiled antibacterial polyamide pre-oriented yarn is prepared through a profiled-hole spinneret, and then subjected to texturing to produce a low-elastic textured yarn with excellent wearability, thereby obtaining a polyamide fiber with antibacterial/moisture-conductive properties. Discloses an antibacterial moisture-conducting polyamide fiber, a preparation method and application thereof. In chinese patent publication No. 105887240, a nylon pre-oriented yarn containing silver-based antibacterial masterbatch and water-soluble nylon fiber is subjected to texturing (crimping treatment) to produce a nylon high-stretch yarn, which is spun, and then the fabric is dissolved, and after removing the water-soluble nylon, vacuum silver plating is performed to obtain an antibacterial conductive fabric. Disclosed are a polyamide pre-oriented yarn and a preparation method thereof, a polyester fiber fabric and a preparation method thereof. In chinese patent No. 102953137, carbon nanotubes are dispersed in an ionic liquid, and then mixed with a high-elasticity thermoplastic polymer, and melt-spun to obtain a high-elasticity conductive fiber containing carbon nanotubes. Discloses a high-elasticity high-conductivity fiber and a manufacturing method thereof.

In the prior art, the method for producing the conductive fiber by carrying out melt composite spinning on the nylon comprises (1) a process for manufacturing a conductive part of a nylon conductive master batch, (2) a process for simultaneously melting the conductive part and a non-conductive part in the spinning process, combining the conductive part and the non-conductive part at an outlet of a spinning plate after the conductive part and the non-conductive part are correctly metered by a metering pump, and spraying out conductive yarns with a composite structure, and (3) a process for obtaining a conductive fiber protofilament through various processes of stretching, oiling, winding and the like. In the stretching process, in order to ensure that the continuous structure of the conductive layer is not damaged, the stretching process needs to be carried out at a certain temperature. However, this method increases the draw ratio in the spinning process, and cannot ensure 100% continuity, resulting in a decrease in the conductivity of the conductive fiber.

Therefore, the invention aims to overcome the problems in the prior art, and has the effects that (1) the problems that the cohesive force of the conductive filament is not enough when the conductive filament is subjected to composite processing with other fibers, the fuzzing is easy to affect the processing of the fabric, and the texture of the separately woven fabric is hard, the wearability is poor and the like can be solved; (2) the problem of low conductivity of the conductive filament can be solved. Provides a crimped chinlon conductive filament, a manufacturing method and application thereof.

Disclosure of Invention

The invention aims to provide a crimping deformation nylon conductive filament, a manufacturing method and application thereof.

The essence of the invention is to apply a crimping process to a conductive filament having a composite structure of a conductive portion and a non-conductive portion. In addition, in the patent publications, there is no disclosure of performing a crimping treatment on a conductive filament having a composite structure (a conductive portion and a non-conductive portion).

The mechanism of action according to the present invention to solve the above problems is as follows. The conductive filament is curled, so that the continuity of the conductive layer can be improved, and the conductivity can be improved. The reason for this is that (1) the conductive layer can be rearranged to improve the continuity of the conductive layer by the curling process including the heating plasticizing process, and (2) the influence on the continuity of the conductive layer is expected to be small because the curling process is performed at a low stretch ratio. Therefore, after the conductive filament is subjected to crimping deformation, the weaving performance of the conductive filament can be improved, and the conductivity can be obviously improved. The crimping and deformation processing of the conductive filament can greatly improve the performance of the conductive fiber product.

In application, in recent years, along with the development of electronic technology and life science, intelligent wearing and fiber type biosensing become the fields of hot technology application and consumer market demand, the demand for functional conductive and antistatic fabrics is continuously rising, and meanwhile, higher requirements are put on the softness and wearability of the conductive fabrics. The conductive fiber with the composite structure has excellent conductivity, is relatively easy to produce and manufacture, is easy to control the production cost, and has great development along with the continuous expansion of intelligent wearing and fiber type biosensing application.

The invention specifically comprises the following contents:

the invention provides a crimping deformation nylon conductive filament, which is obtained by carrying out crimping deformation processing on a nylon conductive filament, wherein the crimping shrinkage rate of the crimping deformation nylon conductive filament is 15-60%, and the crimping stability is 40-90%.

Furthermore, the monofilament fineness of the crimped nylon conductive filament is 1.5-6.0 dtex, the breaking strength is 2.0-3.5 cN/dtex, the elongation at break is 15-45%, and the resistivity is 10⁰～10²Omega cm, surface resistance of 10²～10⁵Ω。

Furthermore, the conductive crimped nylon filament is composed of a conductive part and a non-conductive part.

Further, the conductive part accounts for 10-40% of the total mass of the conductive filament.

Further, the nylon conductive filament is in a core-sheath structure, and a sheath layer of the core-sheath structure is the conductive part.

Further, the nylon conductive filament is of a composite structure, the conductive part is buried in the non-conductive part, and part of the conductive part is exposed on the surface of the nylon conductive filament.

Further, the conductive part is composed of a conductive agent, a processing aid and a polyester fiber-forming polymer.

Further, the conductive agent is conductive carbon black, and the addition amount of the conductive carbon black is 20 to 35% by mass based on the entire mass of the conductive portion.

Further, the conductive agent is a carbon nanotube, and the amount of the carbon nanotube added is 5 to 15% by mass based on the entire mass of the conductive portion.

Further, the conductive agent is a composite conductive agent composed of conductive carbon black and carbon nanotubes, and the amount of the composite conductive agent added is 10 to 25% by mass based on the entire mass of the conductive portion.

Further, the conductive agent is light-color conductive metal oxide, and the addition amount of the light-color conductive metal oxide is 50-80% of the total mass of the conductive part.

Further, the mass ratio of the conductive carbon black to the carbon nanotubes (conductive carbon black: carbon nanotubes) of the composite conductive agent is 10: 1-10: 10.

in another aspect, the present invention further provides a method for manufacturing a crimped chinlon conductive filament, comprising:

the method is characterized in that the crimping deformation nylon conductive filament is manufactured by the steps of heating and plasticizing, cooling, false twisting, shaping, network adding, oiling and winding the nylon conductive filament in sequence.

In the working procedure, the heating plasticizing temperature is 140-195 ℃, the forming temperature is 25-135 ℃, the stretching ratio is 1.05-1.5, the numerical value of D/Y is 1.3-2.5, and the winding speed is 100-800 m/min.

In a third aspect, the invention also provides a production and manufacturing application of the anti-static fabric, the anti-radiation fabric, the fiber fabric type sensor or the intelligent wearable product.

Further, the crimped nylon conductive filament may be the crimped nylon conductive filament.

In a fourth aspect, the invention also provides an antistatic fabric, an anti-radiation fabric, a fiber fabric type sensing or intelligent wearable product containing the crimped chinlon conductive filament.

The invention has the following beneficial effects:

(1) the nylon conductive filament after the crimping deformation treatment has improved cohesive force when being subjected to the cross-twisting and double-twisting processing with nylon low-stretch yarns, cotton-polyester blended yarns or cotton yarns. Therefore, the influence of the occurrence of fuzz or the like on the subsequent fabric can be avoided.

(2) In the crimping deformation processing process, the conductive part of the conductive fiber is heated and plasticized, so that the continuity of the conductive structure is better, and the conductivity is improved. Therefore, the conductive paste can be applied to products requiring higher conductivity.

(3) The nylon conductive filaments after the crimping deformation treatment are directly used for weaving, and the produced fabric has soft hand feeling and comfortable wearing while maintaining the original good conductivity.

Drawings

The invention is further illustrated with reference to the following figures and examples.

FIG. 1 is a schematic view of a core-sheath structure of a crimped nylon conductive filament. In the figure, the sheath layer is a conductive portion.

FIG. 2 is a schematic diagram of a composite structure of a crimped nylon conductive filament. In the figure, the conductive part is buried in the non-conductive part, and a part of the conductive part is exposed on the surface of the nylon conductive filament.

FIG. 3 is a conceptual view of a device (texturing machine) for producing a textured nylon conductive filament.

In the figure: 1 conductive part, 2 non-conductive part.

Detailed Description

The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic views illustrating only the basic structure of the present invention in a schematic manner, and thus show only the constitution related to the present invention.

Crimped chinlon conductive filament

The invention relates to a crimping deformation nylon conductive filament, which is a filament obtained by crimping deformation processing treatment on a nylon conductive filament. The physical properties of the filament will be described below.

Noun interpretation

(crimp contraction Rate)

The crimp shrinkage rate of the crimped nylon conductive filament is 15-60%. Here, "crimp contraction" has the following meaning.

[ EQUATION 1 ]

Here, L g crimped filament length measured by applying 500g tension

L z measured crimped filament length with 25g applied tension

(crimp stability)

The crimp stability of the crimped chinlon conductive filament is 40-90%. Here, "curl stability" has the following meaning.

[ equation 2 ]

Here, L b is the length measured by applying 2500g of tension to the crimped filament whose crimp contraction is to be measured and then reducing the tension on the crimped filament to 2.5 g.

(fineness of monofilament fiber)

The monofilament fineness of the crimped nylon conductive filament is generally 1.5-6.0 dtex.

(breaking Strength)

The breaking strength of the crimped nylon conductive filament is generally 2.0-3.5 cN/dtex. Here, "breaking strength" has the following meaning.

[ equation 3 ]

(ratio of maximum tensile force that the fiber can withstand to the actual fineness of the fiber)

(elongation at Break)

The breaking elongation of the crimped chinlon conductive filament is generally 15-45%. Here, "elongation at break" has the following meaning.

(ratio of the length of the fiber stretched to break to the original length)

(resistivity)

The electrical resistivity of the crimped chinlon conductive filament is generally 10⁰～10²Omega cm, surface resistance of generally 10²～10⁵Omega. Here, the resistivity is a value measured according to JIS K7194 (test method for measuring resistivity of conductive plastics by four-point probe alignment). In addition, if the crimped nylon conductive filament of the present invention is used, it is possible to produce less than 10 by washing¹The resistance increase (resistance increase after 100 washes of a fabric woven with the filaments compared to the resistance without washing).

Method for manufacturing crimped chinlon conductive filament

The crimping nylon conductive filament is obtained by processing the nylon conductive filament by the steps of heating, plasticizing, cooling, false twisting, shaping, adding a network, oiling and winding in sequence. The following is a detailed description of the raw materials and processes.

Raw material

The invention is obtained by the melt composite spinning process to prepare the nylon conductive filament and by the curling processing deformation, and the nylon conductive filament consists of a conductive part and a non-conductive part. Wherein the conductive part generally accounts for 10-40% of the total mass of the conductive filament. The non-conductive part is polyester fiber forming polymer, and the conductive part is composed of polyester fiber forming polymer, conductive agent and auxiliary agent. And processing the conductive part and the non-conductive part by using composite spinning manufacturing equipment to obtain the nylon conductive filament with the composite structure. The following is a detailed description of each raw material.

(conductive agent)

The conductive agent is not particularly limited, but is preferably conductive carbon black, carbon nanotubes or a composite thereof, or conductive metal oxide powder. These conductive agents may be used alone or in combination as appropriate.

(polyester fiber-Forming Polymer)

The polyester fiber-forming polymer is not particularly limited, and includes aromatic polyester resins { e.g., aromatic polyesters of the polyethylene terephthalate (PET), polypropylene terephthalate (PPT), polybutylene terephthalate (PBT) } polyarylates and aliphatic polyesters { e.g., aliphatic polyesters and copolymers thereof, such as polylactic acid, polybutylene succinate (PBS), polybutylene adipate and terephthalate copolymer (PBAT), poly-caprolactone (PC L) }.

(auxiliary agent)

The auxiliary agent may be a coupling agent, a dispersant, an antioxidant, a lubricant, where the coupling agent may be an aluminate coupling agent, a titanate coupling agent, or a silane coupling agent, the dispersant may be a polyester wax dispersant, the antioxidant may be antioxidant 1010 or the antioxidant D L TP. lubricant may be magnesium stearate or zinc stearate.

"Art

{ manufacturing Process (1) }of conductive Master batch

The conductive master batch is a granular material prepared by mixing and mixing a conductive agent or a composite conductive agent, an auxiliary agent and polyester fiber-forming polymer slices, and performing processing processes such as extrusion, water cooling, grain cutting and the like through equipment such as a double-screw extruder. When the fibers are black, the amount of the conductive agent is generally 20 to 35% by mass when the conductive agent is conductive carbon black. Alternatively, when the conductive agent is a carbon nanotube, the amount of the conductive agent added is generally 5 to 15% by mass. Or when the conductive agent is a composite conductive agent consisting of conductive carbon black and carbon nanotubes, the addition amount is generally 10 to 25% by mass. When the fibers are light-colored or white, the conductive agent is a light-colored conductive metal oxide (e.g., antimony-doped titanium oxide conductive powder), and the amount of the conductive agent added is generally 50 to 80% by mass. The conductive mother particles are dried in advance, and the water content is controlled to be less than 100 ppm.

In the manufacturing process of the conductive master batch, (1) for example, the mixing temperature is 80-150 ℃ and the time is 30-120 min. The extrusion temperature of the twin screw extruder is determined by the melting point of the polyester fiber-forming polymer. For example, for nylon polymer with a melting point of 220 ℃, the temperature setting method is that the temperature of the first zone is set to be 80-100 ℃, the temperature of the second zone is set to be 200 ℃, and the temperature of each zone from the third zone to the discharge port is set to be 250-270 ℃. In addition, the height-width ratio of the screw can be 1: 25-1: 50.

{ composite spinning Process (2) }

Composite spinning (conductive filament), polyester fiber-forming polymer chips and conductive master batches are respectively melted and conveyed by a screw extruder, metered by a metering pump, distributed to a composite spinning plate, sprayed out of a spinneret plate, and finally cooled, solidified, stretched, oiled, guided and wound by side air blowing. Here, the cut pieces of the nonconductive portion to be used were dried in advance, and the water content was controlled to 50ppm or less. The drying process can use a flow drying bed, drum drying, continuous drying in a nitrogen environment, and the like.

In the composite spinning process (2), the temperature of the screw extrusion assembly in the spinning process is required to meet the requirements of normal melting and conveying of polymers and achieve a certain apparent viscosity. In particular, it is to be noted that in the production of composite spinning, the apparent viscosities of the two spinning melts are brought close to each other. This is extremely important in the normal course of spinning, and careful process exploration and validation should be performed for different polyester fiber-forming polymers. In the process (2), the process parameters for cooling the threadline include the wind pressure, wind speed, wind temperature and wind humidity of the cross-wind. The stretching and winding speed is generally 2000-5000 m/min, and the stretching can be carried out by a hot box or a hot roller.

The performance indexes of the typical carbon black core sheath type nylon conductive filament are that (1) the single filament fineness is 5.5 dtex; (2) the breaking strength is 2.5 cN/dtex; (3) elongation at break of 55%; (4) the resistivity is 75 omega cm; (5) surface resistance of 10⁴Ω。

{ crimping deformation processing technology (3) }

The crimping process (3) is a process of crimping the conductive filaments by using an elasticizer.

(texturing apparatus)

Here, first, referring to fig. 3, the elasticizing apparatus will be described in detail. The elasticizer consists of a stretching deformation area, a shaping area and a winding area. The process is as follows: the filament frame → filament arm → filament separating plate → filament pressing piece → unwinding center → filament tube entrance guide → filament guide tube → filament cutter → filament divider → first roller (FR1) filament moving device → first roller (FR1) → roller arm → steel roller → leather roller → hair-lift rod → fixed guide → twist stop → shockproof guide device → hot box entrance guide → hot box exit guide → first heating box (H1) → cooling plate entrance guide → Cooling Plate (CP) → cooling plate exit guide → False Twister (FT) → tension guide → tension sensor → second roller (FR2) filament moving device → second roller (FR2) → second heating box (H2) → third roller (FR3) → network nozzle → filament cutter → filament finder → inductor → upper and lower oil tanker → filament divider → filament closing plate → filament drawing device → black lead → filament arm → filament drawing device → filament arm → filament drawing device → filament arm → filament drawing device → filament drawing device → filament. The simplified process flow is as follows: POY filament → filament cutter → first roller (FR1) → raising rod → twist stopper → modification hot box (H1) → Cooling Plate (CP) → False Twister (FT) → second roller (FR2) → shaping hot box (H2) → (web nozzle) → third roller (FR3) → finish → winding roller (FR4) → winding → classification inspection → packaging warehousing. The following is a detailed description of important elements.

Wire feed roller

The function of the feed roller is to realize the conveying function of the strand silk. The first roller is a roller for feeding the filament edge. The device has two composition modes, one is a wire feeding roller and a leather ring, and the other is the wire feeding roller and the leather roller. The leather ring has the advantages of large contact area, large holding force, reduced bearing abrasion and easy damage. The leather roller has the advantages of wear resistance and repeated use, and has the defect of insufficient holding force and needs to be compensated by winding on the roller. The better devices are a wire feeding roller and a leather roller, two turns of the wire feeding roller and two turns of the wire feeding roller are needed on FR2, and two turns of the wire feeding roller (the distance between wires is generally 5-10mm) are needed on FR1 to make up for the lack of tension when fine denier is processed. The strand silk passes through first roller and draws to rising first pole, rises first pole top and has one and ends twister device, and the effect is fixed the strand silk at first heating box top, plays and prevents that the silk from escaping to twist or back twist. The traversing yarn-moving device in front of the yarn-feeding roller has the functions of avoiding the concentrated abrasion of the yarn to the roller and prolonging the service life of the leather collar (or the compression roller). When the elastic yarn is produced, the distance between the yarn moving parts is generally 5-10 mm. When the yarn moving position is not correct, the running of the yarn strips in the specified range of the yarn feeding leather ring (or the compression roller) cannot be ensured, and the execution of the yarn strips according to the specified process requirements cannot be ensured. If the traverse yarn-moving device before the first and second rollers is not in a correct position, the normal drafting of the yarn is not ensured, and yarn winding is caused.

First heater

The first heater is also called a modified heat box, and is a contact heating mode, wherein the 1000M type length is 2.5M, and the V type length is 2.0M. The heating filament is in a plasticized state, so that the tensile deformation stress is reduced, and the tensile deformation is easier. It is heated by vacuum sealed biphenyl steam and electric heating.

Cooling plate

The cooling plate is used for fixing the curling structure of the twisted fibers, and if the fibers are not well (or uniformly) cooled, the curling structure formed by the fibers in the twisting process is not uniform, so that the dyeing uniformity is influenced, and fading and discoloration are caused. The strand is cooled by a cooling plate on the texturing machine.

False twister

The function of the false twister is to generate mechanical twisting stress for texturing. It is the core of the elasticizer. It is the action of twisting and untwisting the threadline by the deflection of the friction disk to form a false twist (generally "Z" twist). The friction disk is generally divided into a floppy disk (polyurethane PU disk and the like) and a hard disk (ceramic disk, sand disk and the like), the floppy disk has high friction coefficient, soft surface, small damage to the silk strips and less snow flakes, but has short service life and high cost; whereas a hard disk is the opposite of a floppy disk.

Second roller (middle roller)

Usually, the speed of the intermediate rollers is the so-called processing speed. In order to prevent the occurrence of the twisted yarn, the inner holding of the leather ring frame is required to be strong.

Second heater

The second heater, also called the setting hot box, is non-contact. The method has the main functions of eliminating the internal stress of the deformed filament and improving the dimensional stability of the fiber. When the temperature of the second heating tank is increased, the crimp rate (elasticity) of the finished fiber is reduced, the boiling water shrinkage rate is reduced, the dimensional stability is improved, and the residual torque of the filament is reduced.

Third roller

The requirements for the holding of the leather ring are relatively high, but are lower than the requirements for W2 and W1. The function OF the method is to form OF2 (namely forming overfeeding), carry out relative relaxation state forming, eliminate most internal stress in deformation, and ensure moderate bulkiness, moderate elasticity, normal boiling water shrinkage and good dimensional stability. The overfeed ratio between the second roller A and the third roller, namely the setting overfeed, mainly controls the filament to be set in a relatively loose state.

Oil tanker

The oil tanker mainly adds proper oil agent to the low stretch yarn, and has the functions of improving the bundling property of the fiber, increasing the smoothness of the fiber, improving the antistatic property of the fiber and adapting to the requirements of subsequent weaving. The oiling rate, the amount of the oil accounts for the total weight of the fiber, and is generally about 2 percent. Also affecting the oiling rate there is the rotational speed of the tanker.

Filament detector and filament cutter

The thread detector in the draw texturing machine is also called a thread breakage detector or a sensor, and automatically cooperates with a thread cutter (also called a thread cutter). When the filament is broken during running, the filament detector senses the broken filament and triggers the filament cutter to cut the broken filament before feeding into the roller to prevent the broken filament from winding on the roller.

Filament suction device

The silk sucker is used for helping to lift the head, drop the tube and strip the silk.

Smoking device

The smoking device is arranged at the outlet of the first heating box and is used for absorbing various gas volatile matters generated by heating the filament in the first heating box so as to prevent the heating box from scaling.

(Process conditions)

The process conditions were mainly processing speed (YS), Draw Ratio (DR), speed ratio (D/Y, ratio OF surface speed OF friction disk to speed OF filament leaving the false twister), K value (ratio OF untwisting tension to twisting tension) and three overfeeds OF 2%, OF 2A%, OF 3% and two hot box temperatures, i.e. the temperature OF the first heating box (H1) and the temperature OF the second heating box (H2).

Temperature (H1, H2) and chill plate

The temperature of the first heating box is the deformation temperature of the fibers. It is required that at this temperature, no sticking of the fibers can occur while they are plasticized. The second heating box, also called the setting heating box, is non-contact air heating, generally heated by a heating medium, and is used for setting the false twisted yarn. The temperature of the second heating chamber increases, and the crimp rate (elasticity) of the yarn decreases. Specifically, the temperature of the first heating box is about 160 ℃ to 185 ℃, and the first heating box is heated by vacuum seal biphenyl steam and electric heating in a combined manner. The shaping area is mainly a second heating box, also called a shaping hot box, is heated by non-contact air and is heated by a heating medium. Its temperature is around 140 deg.C (30 deg.C lower than the first heating box). The function of the device is to shape the processed filament, so if the temperature of the second heating box is increased, the crimp rate (elasticity) of the filament is reduced, and the boiling water shrinkage rate is reduced. Therefore, when the high elastic yarn is processed, the second heating box is closed. In addition, a cooling plate is arranged below the first heating box and mainly used for fixing the thermal deformation of the filament, reducing the thermoplasticity of the filament, enabling the filament to have certain rigidity and facilitating the transmission of twist. If the cooling is not good (or uniform), the crimp structure formed by the fibers during false twisting is not uniform, which affects the uniformity of dyeing, discoloration, etc. For example, using sheet metal air cooling, the wire is cooled to 80 ℃ and the length of the cooling plate is 1.5 m.

Draft ratio and speed (overfeed rate)

The draft ratio is the speed ratio of the second roller to the first roller (DR: FR2/FR 1). The calculated draw ratio is generally the denier of the filament/denier of the processed filament, and considering the critical draw factor, the actual draw ratio is equal to or less than the calculated draw ratio multiplied by 1.1. The strength of the yarn increases and the elongation decreases with an increase in the draw ratio. However, since the draw ratio is low, twist cannot be completely removed below the false twister, fibers may stick together to form a tight spot, and if the draw ratio is too high, the yarn under the false twister is in a loose state, and yarn breakage tends to occur due to too high tension, the draw ratio is set in consideration of the index of the strength elongation, and in addition to the index of the tension change, the tension change should be observed to reduce the yarn breakage and the tight spot.

The processing speed is the speed of the second roller. Generally, the processing speed is 15% to 20% lower than the critical speed, and a preferable speed is about 300 to 500 m/min. The processing speed is high, the false twisting tension of the filament is increased, the contact pressure of the filament and the friction disc is increased, the slippage between filament discs is reduced, the crimp rate and the crimp stability are high, but the broken filaments are generated. The three overfeeds related to the processing speed were OF 2%, OF 2A%, OF 3%, i.e., OF 2% (shaped overfeed), OF 2A% and OF 3% (winding overfeed), respectively. Overfeed rate affects the strength of the yarn as well as its stretch. OF 2% will adjust the tension OF the second heating box to control the heat setting effect and affect the bulkiness OF the filament, but if the ratio is set too high, the filament will shake from FR2 roller, and generate the abnormal phenomena OF loose loop and color spot on the filament, and the formula is: OF 2% (FR2A-FR3) × 100/FR 2A. OF 3% mainly adjusts the winding tension and determines whether the package forming is good or bad, and the formula is: OF 3% (FR2A-WR) × 100/FR 2A. OF 2A% is the tension controlling the network air pressure, and there are 1 network nozzle between FR2 and FR2A, so this tension directly affects the number OF networks.

K value and D/Y ratio

The D/Y ratio is the ratio of the surface speed of the friction disk to the speed of the filament leaving the false twister (friction disk speed/FR 2). Within a certain range, the change of the fiber has almost no influence on the physical indexes of the fiber such as the crimp rate, the crimp stability, the strength, the elongation and the like, and is related to the tension before and after the false twister in the processing. The tension before false twisting represents T1 (twisting tension), the tension after false twisting represents T2 (untwisting tension), and when the yarn speed is kept constant, the untwisting tension is lowered by only increasing the surface speed of the twisting disk. In short, an increase in D/Y, T1 > T2, results in a tight spot; a decrease in D/Y, T1 < T2, results in fuzz. Therefore, the numerical value of D/Y is generally controlled to be 1.6-2.5, and physical indexes such as the curling performance, the strength and the like of the low-stretch yarn are almost unchanged along with the change of the D/Y ratio in the range, so that stable production is facilitated.

The most suitable technological parameters for the crimping and deformation processing of the carbon black type composite structure conductive filament are basically that the temperature for heating and plasticizing is 140-195 ℃, the setting temperature is 25-135 ℃, the stretching ratio is 1.05-1.5, the numerical value of D/Y is 1.3-2.5, and the winding speed is 100-800 m/min.

Application of crimped chinlon conductive filament

The fiber combination can be obtained by using the crimped chinlon conductive filament. The term "fiber-bonded body" as used herein includes not only a molded article such as a woven fabric (e.g., a cloth or a nonwoven fabric), but also a 3D fiber molded article.

The crimped chinlon conductive filament has good conductivity and softness, and can be used for manufacturing intelligent wearing products and fiber type sensors. The crimped chinlon conductive filament has low resistance value and excellent electromagnetic wave and magnetic shielding performance, and can be applied to production and manufacture of radiation-proof clothes. The crimped conductive filament yarn of the present invention has more excellent subsequent weaving performance, and can be used for manufacturing conductive filament yarns, double yarns (co-twist), double twisted yarns (also referred to as yarn), multi-yarns and composite twisted yarns.

From other points of view, the application of the crimped chinlon conductive filament can be roughly divided into two types. One is to directly produce cloth or non-woven fabric by using the material as a raw material. The other type is that the crimped chinlon conductive filament and the raw material fiber of the non-conductive fiber are twisted and double-twisted and then woven to prepare the fiber functional material body. Any type of antistatic fabric, radiation-proof fabric, fiber fabric type sensing and intelligent wearing manufactured by the crimped chinlon conductive filament is in the application range of the invention.

Possibility of Industrial use

The invention relates to a technology for carrying out crimping deformation treatment on conductive fiber precursor prepared by a composite spinning process. The crimped chinlon conductive filament, the conductive composite filament and the finished products thereof have the characteristics of good electrical conductivity, heating property, static resistance, electromagnetic wave shielding, thermal conductivity and the like, and have convenient processability and comfortable wearability. The conductive crimped nylon filament, the conductive composite yarn and the finished products thereof have excellent durability of the above characteristics, and also have good characteristics such as softness, touch (or texture), usability and processability. Therefore, by utilizing the above-mentioned properties as much as possible, the crimped nylon conductive filament, the conductive composite yarn, and the finished products thereof according to the present invention, such as clothing applications (e.g., work clothes or uniforms) for preventing static electricity or shielding electromagnetic waves, interior decoration applications (e.g., curtains, carpets, wall covering materials, partitions), bag filters, machine covers, copier brushes, industrial materials for electromagnetic wave protection, and the like, can be effectively applied to various uses. In addition, according to the manufacturing method of the invention, the crimped chinlon conductive filament, the conductive composite filament and the finished products thereof can be more flexibly produced and manufactured. In short, the manufacturing method has excellent utility.

[ examples ] A method for producing a compound

<Production example 1>Manufacture of carbon black type chinlon conductive filament (composite structure)

An example of a general carbon black type nylon conductive filament (composite structure) is described below. The composite structure used in the following examples can be produced by referring to production example 1.

6kg of carbon black conductive agent, 150g of aluminate coupling agent, 600g of polyester wax dispersant, 20g of mixed antioxidant of 1010 and D L TP, 150g of magnesium stearate and 13.1 kg. PPT polyester chip, the materials are previously mixed (mixing temperature: 120 ℃, mixing time: 60min), and then, a twin-screw extruder is used for melting, so that conductive master batch with the content of the carbon black conductive agent of 30 wt% is obtained, and the materials are fully dried.

80kg of dried non-conductive part PPT polyester chips and the conductive master batches are respectively put into a screw extruder to be melted, and the melt is conveyed. The melt is accurately measured by each metering pump according to a certain proportion (the conductive part is the whole fiber)20 wt%) of the raw fiber is poured into an embedded external-conduction three-wing composite spinning machine to be mixed, and the mixture is sprayed out from a spinneret orifice to form a melt trickle, the melt trickle is cooled by cooling air and solidified to form primary fiber (the air pressure of side air supply is 80Pa, the air speed is 0.8m/s, the air temperature is 15 ℃, and the air humidity is 65%), after cooling, the tow is oiled by a yarn guide and reaches a winding process through a channel, the running direction of the yarn is changed by an upper yarn guide and a lower yarn guide of an oil tanker, after tension is adjusted, the yarn enters a winding machine to be made into a spinning cake (the winding speed is 3800m/min), finally, 160D/32f of embedded external-conduction three-wing conductive fiber is manufactured (the conductive part accounts for 25 wt%, the conductive carbon black accounts for 6 wt% of the total mass of the fiber, and the resistance is 4 × 10⁵Ω/cm, and resistivity of 60 Ω · cm). The embedded external-conduction tri-wing-shaped nylon conductive fiber is of a composite structure and comprises a carbon black conductive part and a non-conductive part, wherein the carbon black conductive part is provided with 3 wing (tri-blade type) wing-shaped parts which are partially exposed out of the non-conductive part.

<Production example 2>Manufacture of carbon black type crimped chinlon conductive filament (core-sheath structure)

An example of a general carbon black type nylon conductive filament (core-sheath structure) is described below. The core-sheath structure used in the following examples can be manufactured by referring to this manufacturing example 2.

5.5kg of carbon black conductive agent, 150g of titanate coupling agent, 600g of polyester wax dispersant, 20g of mixed antioxidant of 1010 and D L TP, 150g of magnesium stearate and 13.6 kg. PBT polyester chip, the materials are previously mixed (mixing temperature: 120 ℃ C., mixing time: 60min), and then, melting is carried out by a twin-screw extruder to obtain conductive master batch with 27.5 wt% of carbon black conductive agent, and the conductive master batch is fully dried.

And (3) respectively putting 80kg of dried non-conductive part PET polyester chips and the conductive master batches into a screw extruder for melting, and conveying the melt. After the melt is accurately measured by each metering pump, the melt is poured into a sheath-core type external guide composite spinning machine according to a certain proportion (the conductive part is 20 wt% of the total weight of the fiber) to be mixed, and the mixture is sprayed out from a spinneret orifice to form melt trickle. Here, the temperature of the composite spinning beam was 289 ℃. The melt thin stream is cooled and solidified by cooling air to form nascent fiber (the wind pressure of side air supply is 8)0Pa, the wind speed is 0.8m/s, the wind temperature is 15 ℃, the wind humidity is 65 percent, after cooling, the tows are oiled by the thread guide, the tows reach the winding process through the channel, the running direction of the yarns is changed by the thread guide on and off the oil tanker, after adjusting the tension, the tows enter the winding machine to be made into spinning cakes (the winding speed is 3800m/min), finally, the sheath-core type external conductive nylon conductive fiber (the conductive part accounts for 20 percent by weight, the conductive carbon black accounts for 6.9 percent by weight of the total mass of the fiber) of 160D/32f is made, and the resistance measured by a high resistance measuring instrument is 3 × 10⁵Ω/cm, and resistivity of 40 Ω · cm). The sheath of the filament is the conductive portion of carbon black.

<Example 1>Production of crimped nylon conductive filament (composite structure)

(Nylon conductive filament)

The conductive nylon filament obtained was a composite structure (comprising a conductive part and a non-conductive part, the conductive part being of a trilobal type, and being buried in the non-conductive part) in which the filament had a fineness of 110dtex/32f, a breaking strength of 2.6cN/dtex, an elongation at break of 75%, and a high-voltage resistance of 5 × 10⁵Omega/cm, surface resistance of 10⁵Ω。

(crimp deformation processing parameters)

The parameters of the curling deformation processing technology are that the temperature of the first heating box is 180 ℃, the elongation rate is 1.2, the D/Y is 1.8, the temperature of the second heating box is 130 ℃, the combination form of the friction disc is 3-5-1, the setting underfeed is-7.5%, the winding underfeed is-4.5%, and the processing speed is 280 m/min.

(crimped chinlon conductive filament)

The fiber indexes of the obtained crimped nylon conductive filament are that the fineness is 92dtex/32f, the breaking strength is 2.6cN/dtex, the elongation at break is 25%, the crimp shrinkage is 22%, the crimp stability is 70%, the oil content is 2.5%, the boiling water shrinkage is 4.5%, and the high-voltage resistance is 2 × 10⁶Omega/cm, surface resistance of 10⁵Ω。

<Example 2>Production of crimped chinlon conductive filament (core-sheath structure)

(Nylon conductive filament)

The nylon conductive filament obtained was a carbon black core-sheath type nylon conductive fiber, wherein the fineness of the filament was 86dtex/16f, the breaking strength was 2.5cN/dtex, the elongation at break was 65%, and the high-voltage resistance was 1.5 × 10%, according to the method described in production example 2⁶Omega/cm, surface resistance of 10³Ω。

(crimp deformation processing parameters)

The parameters of the curling deformation processing technology are that the temperature of the first heating box is 180 ℃, the extension rate is 1.05, the D/Y is 1.9, the second heating box is closed (the room temperature is about 25 ℃), the friction disc combination form is 3-5-1, the setting underfeed is-6.8%, the winding underfeed is-4.0%, and the processing speed is 450 m/min.

(crimped chinlon conductive filament)

The fiber indexes of the obtained carbon black core sheath type crimped nylon conductive filament are that the fineness is 78dtex/16f, the breaking strength is 2.9cN/dtex, the elongation at break is 28%, the crimp shrinkage is 45%, the crimp stability is 68%, the oil content is 3.0%, the boiling water shrinkage is 6.5%, and the high-voltage resistance is 8.5 × 10⁵Omega/cm, surface resistance of 10³Ω。

<Example 3>Processing of low-torque or no-torque twisting crimping deformation polyamide conductive filament

(Nylon conductive filament)

According to the method as described in production example 2, a nylon conductive filament was first produced, which is a carbon black core-sheath type nylon conductive fiber, wherein the nylon conductive filament had a fineness of 86dtex/16f, a breaking strength of 2.5cN/dtex, an elongation at break of 65%, and a high-voltage resistance of 1.5 × 10⁶Omega/cm, surface resistance of 10³Ω。

(crimp deformation processing parameters)

The technological parameters of the crimping deformation processing are that the temperature of a first heating box is 170 ℃, the elongation rate is 1.2, the D/Y is 1.9, two conductive filaments are converged by a false twister according to the directions of Z twist and S twist respectively, a second heating box is closed (the room temperature is about 25 ℃), the setting underfeed is-6.8%, the winding underfeed is-3.1%, and the processing speed is 450 m/min.

(crimped chinlon conductive filament)

The indexes of the obtained carbon black core sheath type crimped nylon conductive filament are that the fineness is 145dtex/32f, the breaking strength is 3.1cN/dtex, the elongation at break is 28%, the crimp shrinkage is 45%, the crimp stability is 75%, the oil content is 3.0%, the boiling water shrinkage is 6.5%, and the high-voltage resistance is 8.5 × 10⁵Omega/cm, surface resistance of 10³Ω, substantially no torque.

<Example 4>Cross-twisting and double-twisting processing of crimped chinlon conductive filament and cotton-polyester blended yarn

The raw materials of the co-twisted yarn are 20D/4f crimped nylon conductive filament and 45s cotton-polyester blended yarn with the twist number of 1100. The two yarns are put into a double-twisting machine for double twisting, and the number of the twists is set to 680, so that the cotton-polyester blended conductive filament yarn with the length of 20D/4f +45s is obtained. The result proves that no broken filament is found on the bobbin, the conductivity is not affected, and the effect is excellent.

<Example 5>Crimped chinlon conductive filament yarn knitted sock

Socks with a length of 50cm were knitted on a hosiery knitting machine using the carbon black core-sheath type crimped nylon conductive filaments obtained in example 2. As can be seen from the appearance, the fabric is neat and beautiful, the hand feeling is soft, and the measurement result of the surface resistance is 10³Omega. After 50 times of washing with water and detergent, the surface resistance is slightly reduced and stays at 10^3～4Ω。

<Comparative example 1>Conducting fiber and cotton-polyester blended yarn cross-twisting-double-twisting processing

The raw material of the co-twisted yarn is not the product of the invention, but the conductive fiber of the 20D/4f nylon conductive filament and 45s cotton-polyester blended yarn with the twist number of 1100 are used on the market. The two yarns are put into a double-twisting machine for double twisting, and the number of the twists is set to 680, so that the cotton-polyester blended conductive filament yarn with the length of 20D/4f +45s is obtained. As a result, it was found that the yarn is easily formed on the bobbin, and the desired effect is not achieved.

<Comparative example 2>Conductive fiber knitted sock

The raw materials used are not products of the invention, but areA commercially available 83dtex/16f conductive fiber precursor was used to knit a sock 50cm in length on a hosiery knitting machine. As can be seen from the appearance, the fabric was rough, the hand was hard, and the surface resistance was measured to be 10³Omega. After 50 times of washing with water and detergent, the surface resistance is obviously reduced, and the value is 10^4～5Ω。

In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.

Claims

1. A crimped chinlon conductive filament is characterized in that,

the crimped nylon conductive filament is obtained by performing crimping processing on a nylon conductive filament;

the crimp deformation nylon conductive filament has the crimp shrinkage rate of 15-60% and the crimp stability of 40-90%.

2. The crimped nylon conductive filament according to claim 1,

the monofilament fineness of the crimped nylon conductive filament is 1.5-6.0 dtex, the breaking strength is 2.0-3.5 cN/dtex, the elongation at break is 15-45%, and the resistivity is 10⁰～10²Omega cm, surface resistance of 10²～10⁵Ω。

3. The crimped nylon conductive filament according to claim 1 or 2,

the conductive crimped nylon filament consists of a conductive part and a non-conductive part.

4. The crimped nylon conductive filament according to claim 3,

the conductive part accounts for 10-40% of the total mass of the conductive filament.

5. The crimped nylon conductive filament according to claim 3,

the nylon conductive filament is in a core-sheath structure;

the sheath layer of the core-sheath structure is the conductive portion.

6. The crimped nylon conductive filament according to claim 3,

the nylon conductive filament is of a composite structure,

the conductive part is buried in the non-conductive part, and a part of the conductive part is exposed on the surface of the nylon conductive filament.

7. The crimped nylon conductive filament according to claim 3,

the conductive part is composed of a conductive agent, a processing aid and a polyamide fiber-forming polymer.

8. The crimped nylon conductive filament according to claim 7,

the conductive agent is conductive carbon black, and the addition amount of the conductive carbon black is 20-35% of the total mass of the conductive part.

9. The crimped nylon conductive filament according to claim 7,

the conductive agent is a carbon nano tube, and the addition amount of the carbon nano tube is 5-15% of the total mass of the conductive part.

10. The crimped nylon conductive filament according to claim 7,

the conductive agent is a composite conductive agent composed of conductive carbon black and carbon nanotubes, and the addition amount of the composite conductive agent is 10-25% of the total mass of the conductive part.

11. The crimped nylon conductive filament according to claim 7,

the conductive agent is light-color conductive metal oxide, and the addition amount of the light-color conductive metal oxide is 50-80% of the total mass of the conductive part.

12. The crimped nylon conductive filament according to claim 10,

the mass ratio of the composite conductive agent, the conductive carbon black and the carbon nanotube, i.e.

The conductive carbon black: the carbon nano tube is 10: 1-10: 10.

13. a method for manufacturing a crimped chinlon conductive filament,

14. The production and manufacturing application of the crimped nylon conductive filament in antistatic fabric, radiation-proof fabric, fiber fabric type sensors or intelligent wearing products.

15. The manufacturing use according to claim 14,

the crimped nylon conductive filament adopts the crimped nylon conductive filament as claimed in any one of claims 1-12.

16. An antistatic fabric, an anti-radiation fabric, a fiber fabric type sensing or intelligent wearable product containing the crimped chinlon conductive filament.

17. The product of claim 16,

the crimped nylon conductive filament is the crimped nylon conductive filament according to any one of claims 1-12.