CN113005585B - Covered yarn spinning device and preparation method of flame-retardant and anti-electric arc covered yarn - Google Patents
Covered yarn spinning device and preparation method of flame-retardant and anti-electric arc covered yarn Download PDFInfo
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- CN113005585B CN113005585B CN202110249234.XA CN202110249234A CN113005585B CN 113005585 B CN113005585 B CN 113005585B CN 202110249234 A CN202110249234 A CN 202110249234A CN 113005585 B CN113005585 B CN 113005585B
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- D—TEXTILES; PAPER
- D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
- D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
- D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
- D02G3/22—Yarns or threads characterised by constructional features, e.g. blending, filament/fibre
- D02G3/36—Cored or coated yarns or threads
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F2/00—Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof
- D01F2/06—Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof from viscose
- D01F2/08—Composition of the spinning solution or the bath
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- D—TEXTILES; PAPER
- D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
- D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
- D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
- D02G3/02—Yarns or threads characterised by the material or by the materials from which they are made
- D02G3/04—Blended or other yarns or threads containing components made from different materials
- D02G3/045—Blended or other yarns or threads containing components made from different materials all components being made from artificial or synthetic material
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- D—TEXTILES; PAPER
- D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
- D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
- D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
- D02G3/44—Yarns or threads characterised by the purpose for which they are designed
- D02G3/443—Heat-resistant, fireproof or flame-retardant yarns or threads
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- D—TEXTILES; PAPER
- D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B2201/00—Cellulose-based fibres, e.g. vegetable fibres
- D10B2201/20—Cellulose-derived artificial fibres
- D10B2201/22—Cellulose-derived artificial fibres made from cellulose solutions
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- D—TEXTILES; PAPER
- D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B2331/00—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products
- D10B2331/14—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products polycondensates of cyclic compounds, e.g. polyimides, polybenzimidazoles
Abstract
The invention relates to a covered yarn spinning device and a preparation method of flame-retardant and arc-resistant covered yarn, wherein the covered yarn spinning device comprises a core yarn feeding mechanism, an outer covered yarn feeding mechanism and an outer covered yarn straightening mechanism, and the outer covered yarn feeding mechanism and the outer covered yarn straightening mechanism rotate around the axis of the outer covered yarn feeding mechanism and the outer covered yarn straightening mechanism so as to drive the outer covered yarn to spirally move around the core yarn. The preparation method of the flame-retardant and anti-electric arc coated yarn comprises the following steps: the polyimide fiber is used as a core yarn, the Modal-based graphene composite fibers are used as outer covering yarns, and the outer covering yarn straightening mechanism drives the outer covering yarns to rotate relative to the core yarn and spirally wind the outer covering yarns outside the core yarn through the yarn leading device to form the flame-retardant and anti-electric arc covering yarns. The flame-retardant and arc-resistant covered yarn prepared by the invention has excellent flame-retardant performance, excellent arc resistance, excellent flexibility and durability.
Description
Technical Field
The invention relates to the technical field of preparation of blended yarns of fabrics with arc-proof performance and fire-proof performance, in particular to a covered yarn spinning device and a preparation method of flame-retardant arc-proof covered yarns.
Background
At present, the flame-retardant and arc-proof fiber and yarn are developed to a certain extent, and part of the prior art is successfully applied to daily life and production in the flame-retardant and arc-proof environment. An arc-resistant and flame-resistant modacrylic/cotton/aramid fiber blend as proposed in chinese patent CN200580007194.7 achieves flame and arc resistance by modifying the fiber. Chinese patent CN201310296070.1 proposes a method for obtaining the arc resistance by polyimide composite regenerated cellulose fiber. Chinese patent CN201920315798.7 proposes a flame-retardant garment with excellent antistatic and arc-resistant properties, which is obtained by blending and weaving meta-aramid fiber, modacrylic fiber, flame-retardant rayon fiber and para-aramid fiber with an outer layer. Although these methods can obtain flame-retardant and arc-resistant fibers or fabrics, the processing procedures are complicated, the processing pollution such as modification treatment is large, the duration of the flame-retardant and arc-resistant properties is short, and the wearing comfort is poor.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a covered yarn spinning device and a preparation method of flame-retardant and arc-resistant covered yarn.
In order to solve the technical problems, the invention adopts the following technical scheme:
a first object of the present invention is to disclose a covered yarn spinning device, comprising:
a core yarn feeding mechanism for feeding a core yarn;
the outsourcing yarn feeding mechanism comprises a rack and a plurality of outsourcing yarn spools arranged on the surface of one side of the rack, wherein the center of the rack is provided with a first pore channel extending along the axis of the rack;
the outsourcing yarn straightening mechanism comprises a yarn guiding device, the outsourcing yarn straightening mechanism rotates around the axis of the outsourcing yarn straightening mechanism, the yarn guiding device is provided with a plurality of outsourcing yarn guiding holes, the outsourcing yarn guiding holes are used for the outsourcing yarn to pass through, and the center of the outsourcing yarn straightening mechanism is provided with a second pore canal extending along the axis of the outsourcing yarn straightening mechanism; the yarn guide device surrounds the outside of the second pore channel, the first pore channel is opposite to the second pore channel, and the core yarn sequentially passes through the first pore channel and the second pore channel after being supplied by the core yarn feeding mechanism; the outer covering yarn is supplied by an outer covering yarn spool and then enters a yarn leading device, and an outer covering yarn straightening mechanism drives the outer covering yarn to rotate relative to the core yarn through the yarn leading device and spirally wind the outer covering yarn outside the core yarn to form the covering yarn.
Further, the covered yarn spinning device further comprises a covered yarn shaping mechanism for shaping the covered yarn.
Furthermore, the center of the covering yarn shaping mechanism is provided with a third pore passage which is opposite to the second pore passage. The coated yarn passes through the third pore passage after being formed and is shaped in a coated yarn shaping mechanism.
Further, the covered yarn spinning device further includes a fiber collecting mechanism for drafting and collecting the covered yarn.
The second purpose of the invention is to provide a preparation method of flame-retardant and anti-electric arc coated yarn, which is prepared by adopting the coated yarn spinning device of the invention and comprises the following steps:
at least one polyimide fiber is used as a core yarn, a plurality of Modal-based graphene composite fibers are used as an outer covering yarn, the core yarn is fed by a core yarn feeding mechanism and then sequentially passes through a first pore channel and a second pore channel, and the core yarn is fed in a linear direction; and the outsourcing yarn is fed by an outsourcing yarn spool and then enters a yarn guiding device, and an outsourcing yarn straightening mechanism drives the outsourcing yarn to rotate relative to the core yarn through the yarn guiding device and spirally wind the outsourcing yarn outside the core yarn to form the flame-retardant and electric arc-resistant covering yarn.
Further, the outer covering yarn has a helix angle of 30 to 60 degrees with respect to the radial direction of the core yarn.
Furthermore, the ratio of the outer covering yarns to the core yarns is 1:8-10, the number of the core yarns is 1-6, and the number of the outer covering yarns is 6-12.
Further, the core yarn has a diameter of 140D to 280D.
Furthermore, the limit oxygen index of the core yarn is more than or equal to 38 percent, the long-term use temperature is less than 255 ℃, and the instantaneous use temperature is less than 375 ℃.
Further, the modal-based graphene composite fiber comprises a modal fiber matrix and a plurality of graphene nanoparticles distributed in the modal fiber matrix, and a preparation raw material of the modal fiber matrix comprises cellulose pulp.
Further, the mass ratio of the graphene nanoparticles to the cellulose pulp is 12-15: 100.
Further, the fineness of the graphene nanoparticles is 700-850 nm.
Further, the preparation method of the Modal-based graphene composite fiber comprises the following steps:
sequentially carrying out alkalization treatment, ageing treatment and sulfonation treatment on cellulose pulp to prepare cellulose xanthate, dissolving and filtering to prepare spinning solution, uniformly mixing graphene water solution and the spinning solution, filtering, defoaming, aging to prepare spinning solution, carrying out wet spinning on the spinning solution, and collecting to prepare the Modal-based graphene composite fiber.
Further, the alkalization treatment is carried out by adopting sodium hydroxide solution with the concentration of 15-25g/L, the alkalization treatment is carried out for 3-4 hours at the temperature of 10-18 ℃, and the bath ratio is 1: 6-10.
Further, the aging treatment time is 4-5 hours, and the temperature is 14-20 ℃.
Further, the sulfonation treatment is conducted with CS2Treating at 55-75 deg.C for 1-2.5 hr. CS2The mass ratio of the cellulose pulp to the cellulose pulp is 1: 120-150.
Further, the ripening treatment is carried out in a ripening barrel for 6-8 hours at a temperature of 10-20 ℃.
Further, in the graphene aqueous solution, the mass ratio of the graphene nanoparticles to water is 1:3, and the graphene solution further comprises alkali and polyvinylpyrrolidone (PVP), preferably the alkali is sodium hydroxide (NaOH). The addition amounts of the alkali and the polyvinylpyrrolidone are respectively 3-5% of the mass of the graphene. The graphene aqueous solution is prepared by an ultrasonic vibration method in the preparation process.
Furthermore, the cellulose pulp is pulp with polymerization degree not less than 850, narrow distribution and methyl cellulose content not less than 92%.
Furthermore, the wet spinning adopts low-speed spinning, the spinning speed is 28-33m/min, the high-power drafting is carried out in a coagulating bath, the total drafting rate is 75% -85%, the low-power drafting is carried out in post processing, and the total drafting rate is 20% -30%.
Furthermore, the temperature of the coagulation bath required by the drawing treatment is 35-55 ℃, and the coagulation bath comprises 80-100g/L of sulfuric acid, 70-90g/L of zinc sulfate and 150g/L of sodium sulfate 130-.
Further, the core yarn was fed at a speed of 5m/min, which did not rotate during the formation of the covering yarn, and the angular speed of the covering yarn at the time of spiral winding was 120-180 rad/min. In the present invention, the core yarn is fed at the same rate as the collection rate of the finished flame-retardant, arc-resistant covering yarn.
Further, the method also comprises the steps of shaping and collecting after the covering yarn is formed.
The invention also provides flame-retardant anti-electric arc coated yarn which comprises core yarn and outer coated yarn, wherein the core yarn is polyimide fiber, the outer coated yarn is a plurality of Modal-based graphene composite fibers, the plurality of outer coated yarns are spirally wound outside the core yarn, and a certain included angle is formed between the outer coated yarn and the axial direction of the core yarn and is 30-60 degrees.
By the scheme, the invention at least has the following advantages:
the invention provides a covered yarn spinning device, which can be used for simultaneously carrying out spiral covering on core yarns by utilizing a plurality of outer covered yarns, has simple and quick technical process and greatly improves the spinning efficiency of the covered yarns; meanwhile, the device can use special fibers as raw materials to manufacture yarns with specific functions, overcomes the defects of the traditional yarn manufacturing equipment, and can provide help for industrial mass production of yarns.
The invention provides a preparation method of flame-retardant and anti-electric arc covered yarns, which is characterized in that a commercial polyimide fiber is covered by Modal graphene composite fibers, in the covering process, core yarns do not rotate, and outer covering yarns perform spiral motion relative to the core yarns, so that a plurality of outer covering yarns can be covered outside the core yarns at the same time.
The flame-retardant and arc-resistant covered yarn prepared by the preparation method has excellent flame-retardant and arc-resistant performance, excellent mechanical property and wearing comfort, and the graphene and modal fiber are compounded to provide excellent heat conductivity, so that a fabric prepared by the flame-retardant and arc-resistant covered yarn has more excellent wearing comfort. The flame-retardant anti-electric-arc covered yarn prepared by the invention can be widely applied to the field of anti-electric-arc fabrics.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to implement them in accordance with the contents of the description, the following description is made with reference to the preferred embodiments of the present invention and the accompanying detailed drawings.
Drawings
FIG. 1 is a schematic view of a covered yarn spinning apparatus;
fig. 2 is a schematic view of a process for preparing a modal-based graphene composite fiber;
fig. 3 is a schematic cross-sectional view of a modal-based graphene composite fiber;
FIG. 4 is a schematic cross-sectional view of a flame-retardant, arc-resistant covered yarn made in accordance with one embodiment of the present invention;
description of reference numerals:
10-core yarn bobbin; 20-wrapping yarn feeding roller; 21-wrap yarn bobbin; 30-wrap yarn straightening roller; 31-a yarn puller; 40-wrap yarn sizing roller; 41-extending a straight pipe; 50-a spool of fiber collection mechanism; 100-core yarn; 200-wrapping yarn; 201-modal fiber matrix; 202-graphene nanoparticles; 300-wrap yarn.
Detailed Description
The following examples are given to further illustrate the embodiments of the present invention. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
In the following examples, all starting materials are either commercially available or prepared by conventional methods in the art, unless otherwise specified. Wherein the cellulose pulp is purchased from Hengtian Syngnathus Limited company, and is pulp with polymerization degree of not less than 850, narrow distribution and methylcellulose content of not less than 92%; graphene is purchased from Chunhang materials Ltd of Dongguan, and the fineness of the graphene is 800 nm; PVP was purchased from Cinchonglong and New materials, Inc., CAS number 9003-39-8; polyimide fibers were purchased from Qingdao Hengtong Weiwei specialty fibers industries, Inc.
The test methods in the following examples were carried out according to conventional test methods, wherein the arc magnitude values (ATPV) were tested according to IEC61482-1-1 "live working protective clothing-protection against thermal damage of arc 1 part test method 1": testing the arc grade of the flame-retardant garment; limit Oxygen Index (LOI) GB 17591 and 1998.
Example 1
As shown in fig. 1, a covered yarn spinning device includes a core yarn feeding mechanism, an outer covered yarn straightening mechanism, a covered yarn shaping mechanism, and a fiber collecting mechanism, which are sequentially arranged.
Wherein, the core yarn feeding mechanism is used for supplying the core yarn 100, and comprises a core yarn spool 10, and the core yarn 100 is wound on the core yarn spool 10. The core yarn feeding mechanism may feed one or more core yarns 100.
Outsourcing yarn feed mechanism includes outsourcing yarn feed roller 20, and outsourcing yarn feed roller 20 includes the frame of disc and sets up in a plurality of outsourcing yarn spool 21 of frame side surface. The frame has a first aperture extending along its axis in the center. The outer covering yarn bobbin 21 is used for supplying the outer covering yarn 200, and the outer covering yarn bobbin 21 is distributed at intervals in the circumferential direction around the axis of the frame. The frame rotates around the axis of the frame and drives the outer covering yarn spool 21 on the frame to rotate around the axis of the frame.
Outsourcing yarn straightening mechanism includes outsourcing yarn straightening roller 30, is equipped with on the outsourcing yarn straightening roller 30 and draws yarn ware 31, and outsourcing yarn straightening mechanism is rotatory around self axis. The yarn guide 31 has a plurality of covering yarn guide holes for passing the covering yarns 200 therethrough. The center of the outer covering yarn straightening mechanism is provided with a second pore canal extending along the axis of the outer covering yarn straightening mechanism; the yarn guide 31 surrounds the outside of the second hole passage, and the first hole passage is opposite to the second hole passage. When the outsourcing yarn straightening mechanism rotates around the axis of the outsourcing yarn straightening mechanism, the yarn guider 31 rotates around the same axis, so that the outsourcing yarn 200 is driven to move along the spiral direction. The core yarn supplied by the core yarn bobbin 10 moves linearly along the axis direction of the core yarn and sequentially passes through the first pore passage and the second pore passage; the outer covering yarn 200 is fed by the outer covering yarn bobbin 21 and enters the yarn guiding device 31, the outer covering yarn straightening mechanism drives the outer covering yarn 200 to rotate relative to the core yarn through the yarn guiding device 31 and spirally wind the outer covering yarn outside the core yarn to form a covering yarn 300, and the covering yarn 300 is shaped after reaching the covering yarn shaping mechanism.
The covering yarn shaping mechanism comprises a covering yarn shaping roller 40, a third pore channel is arranged in the center of the covering yarn shaping roller 40, and the third pore channel is opposite to the second pore channel. The covered yarn 300 is formed and passed through a third opening and is set in a covered yarn setting mechanism. The shaped covered yarn 300 passes through the straightening tube 41 and reaches the fiber collecting mechanism, and is collected on the winding drum 50 of the fiber collecting mechanism through the drafting and winding actions of the fiber collecting mechanism.
Example 2
A modal-based graphene composite fiber includes a modal fiber matrix 201 and a plurality of graphene nanoparticles 202 distributed in the modal fiber matrix 201. The preparation method of the Modal-based graphene composite fiber comprises the following steps:
sequentially carrying out impregnation alkalization, ageing and sulfonation on the cellulose pulp to prepare the cellulose xanthate, wherein the concentration of sodium hydroxide adopted in alkalization is 25g/L, the cellulose xanthate is treated at 18 ℃ for 3 hours, and the bath ratio is 1: 6. the temperature of the aging treatment is 15 ℃ and the time is 5 hours. The sulfonation treatment is by using CS2The treatment was carried out at 55 ℃ for 1.25 hours. CS2The mass ratio of the cellulose pulp to the cellulose pulp is 1: 150. and dissolving and filtering to prepare spinning solution.
Adding graphene powder into deionized water to be dissolved to prepare a uniformly dispersed graphene solution, wherein the mass ratio of graphene to water is 1: 3. The graphene solution may further include a base and polyvinylpyrrolidone (PVP), preferably the base is sodium hydroxide (NaOH). The addition amounts of the alkali and polyvinylpyrrolidone were each 3% by mass of the graphene. The graphene aqueous solution is prepared by an ultrasonic vibration method in the preparation process. And then adding the graphene solution into the spinning solution, uniformly mixing, wherein the mass ratio of the graphene to the cellulose pulp is 15:100, and filtering, defoaming and aging to obtain the spinning solution. The ripening treatment is carried out in a ripening barrel for 8 hours at a temperature of 12 ℃. And carrying out wet spinning on the spinning solution, and collecting to obtain the Modal-based graphene composite fiber. The wet spinning adopts low-speed spinning, the spinning speed is 28m/min, the high-power drafting rate is 75 percent in a coagulating bath, the low-power drafting rate is in post processing, and the total drafting rate is 25 percent. Wherein the temperature of the coagulating bath required by the drawing treatment is 40 ℃, and the coagulating bath comprises 80g/L of sulfuric acid, 70g/L of zinc sulfate and 140g/L of sodium sulfate.
Example 3
The covered yarn spinning device in embodiment 1 is used to prepare the flame-retardant and anti-electric-arc covered yarn, the flame-retardant and anti-electric-arc covered yarn comprises 3 core yarns and 9 outer covered yarns spirally wound outside the core yarns, the outer covered yarns are Modal graphene composite fibers, and the included angle formed by the outer covered yarns and the axial direction of the core yarns is 30 degrees. The preparation method comprises the following steps:
the Modal-based graphene composite fiber prepared in example 2 was used as an outer covering yarn, the polyimide fiber was used as a core yarn, and the thickness of the polyimide fiber was 280D/660F. Wherein, the number of the core yarns is 3, and the number of the outer covering yarns is 9.
After 3 core yarns are supplied by the core yarn feeding mechanism, the core yarns sequentially pass through the first pore channel and the second pore channel, and the core yarns are supplied along the linear direction; and the outsourcing yarn is fed by an outsourcing yarn spool and then enters a yarn guiding device, and an outsourcing yarn straightening mechanism drives the outsourcing yarn to rotate relative to the core yarn through the yarn guiding device and spirally wind the outsourcing yarn outside the core yarn to form the flame-retardant and electric arc-resistant covering yarn. After the wrap yarn is formed, the wrap yarn is shaped by a wrap yarn shaping roller and then collected on a fiber collecting mechanism. Wherein the feeding speed of the core yarn is 5m/min, the winding angular speed of the covering yarn is 120rad/min, and the collecting speed of the flame-retardant and arc-resistant covering yarn is the same as the feeding speed of the core yarn.
When core yarn reachd rotatory outsourcing yarn through the first pore of rotatory outsourcing yarn feed roller and stretch the roller, the mo dai ji shi graphite alkene composite fiber of outsourcing yarn spool supply arrives outsourcing yarn and stretch the roller with certain speed and stretch and straighten, because the core yarn irrotational in the first pore of outsourcing yarn feed roller and the second pore of outsourcing yarn stretch the roller, mo dai ji graphite alkene fibre takes place to rotate around the axis of core yarn, core yarn and outsourcing yarn produce relative motion, thereby make outsourcing yarn spiral winding in the core yarn outside, finally form fire-retardant anti-electric arc cladding yarn of finished product and be collected on fibre collection mechanism.
The flame-retardant, arc-resistant covering yarn prepared above had a thickness of 860D/660F, a limiting oxygen index of 36, and an arc rating value (ATPV) of 8.1.
The schematic cross-sectional view of the flame-retardant and arc-resistant covering yarn prepared as above is shown in fig. 4, it should be noted that fig. 4 only illustrates the cross-sectional situation of the finished product obtained by the present invention by taking 1 polyimide fiber core yarn and 9 Modal graphene composite fiber covering yarns as examples, and it should not be understood that the finished product of the present invention is only the situation shown in fig. 4, and in fact, the number of the core yarns and the number of the covering layers can be changed within a certain range according to the situation requirements.
Example 4
The utility model provides a fire-retardant anti electric arc cladding yarn, includes 1 piece of core yarn and spiral winding in the outside 9 outsourcing yarns of core yarn, and the outsourcing yarn is Modal base graphite alkene composite fiber, and the angle of the contained angle that the axis direction of outsourcing yarn and core yarn formed is 60.
The flame-retardant and arc-resistant covered yarn was produced in the same manner as in example 3, except that the number of core yarns fed by the core yarn feeding mechanism was 1.
The flame-retardant, arc-resistant covering yarn prepared above had a thickness of 700D/660F, a limiting oxygen index of 35, and an arc rating value (ATPV) of 9.8.
Example 5
The utility model provides a fire-retardant anti electric arc cladding yarn, includes 3 core yarn and 6 outsourcing yarns of spiral winding in the core yarn outside, and the outsourcing yarn is Modal base graphite alkene composite fiber, and the angle of the contained angle that the axis direction of outsourcing yarn and core yarn formed is 30.
The flame-retardant and arc-resistant covered yarn was prepared in the same manner as in example 3 except that the polyimide fiber had a thickness of 200D/660F; the number of the yarn spools for wrapping yarn is 6; the winding angular speed of the over-wrapped yarn was 120 rad/min.
The flame-retardant, arc-resistant covering yarn prepared above had a thickness of 500D/660F, a limiting oxygen index of 37 and an arc rating value (ATPV) of 10.1.
Comparative example 1
The traditional method for obtaining the anti-arc performance through the polyimide composite regenerated cellulose fiber is used for preparing the flame-retardant anti-arc fiber, and the preparation method comprises the following steps:
(a) about 85 wt% modal fibers, the modal fibers having a dry strength of about 27cN/tex or greater, the modal fibers comprising a flame retardant compound within the fibers; and (b) precisely twisting about 15 wt% of para-aramid fiber to prepare the flame-retardant and arc-resistant graphene modal fiber/polyimide fiber composite yarn.
The prepared graphene modal fiber/polyimide fiber has the linear density of the flame-retardant and arc-resistant yarn of 550D/660F, the limiting oxygen index of 30 and the arc value (ATPV) of 7.9.
Comparing the results of the above examples, it can be seen that the flame-retardant and arc-resistant yarn of the flame-retardant and arc-resistant covering yarn prepared by the invention has better performance than the conventional flame-retardant and arc-resistant yarn, which is benefited by the unique covering yarn preparation method provided by the invention, and the core yarn and the covering yarn can be better combined; the invention adopts the modal fiber containing graphene, thereby not only providing excellent comfort, but also further improving the anti-electric arc performance of the covering yarn.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, it should be noted that, for those skilled in the art, many modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (7)
1. A preparation method of flame-retardant and anti-electric arc coated yarn is characterized by adopting a coated yarn spinning device, wherein the coated yarn spinning device comprises a core yarn feeding mechanism for feeding core yarn;
the outer covering yarn feeding mechanism comprises a rack and a plurality of outer covering yarn bobbins arranged on the surface of one side of the rack, wherein a first pore passage extending along the axis of the rack is formed in the center of the rack, the rack rotates around the axis of the rack, the outer covering yarn bobbins are used for supplying outer covering yarns, and the outer covering yarn bobbins are distributed at intervals along the circumferential direction around the axis of the rack;
the outer covering yarn straightening mechanism comprises a yarn guiding device, the outer covering yarn straightening mechanism rotates around the axis of the outer covering yarn straightening mechanism, the yarn guiding device is provided with a plurality of outer covering yarn guiding holes, and the center of the outer covering yarn straightening mechanism is provided with a second pore channel extending along the axis of the outer covering yarn straightening mechanism; the yarn guiding device surrounds the outside of the second pore channel, the first pore channel is opposite to the second pore channel, and the core yarn sequentially passes through the first pore channel and the second pore channel after being supplied by the core yarn feeding mechanism; the outer covering yarn is fed by the outer covering yarn spool and then enters the yarn guiding device, and the outer covering yarn straightening mechanism drives the outer covering yarn to rotate relative to the core yarn through the yarn guiding device and spirally wind the outer covering yarn outside the core yarn to form a covering yarn;
the device also comprises a covered yarn shaping mechanism which is used for shaping the covered yarn;
also comprises a fiber collecting mechanism for drafting and collecting the covering yarn
The preparation method of the flame-retardant and anti-electric arc covering yarn comprises the following steps:
the method comprises the following steps of taking polyimide fibers as core yarns, taking Modal graphene composite fibers as covering yarns, feeding the core yarns by a core yarn feeding mechanism, sequentially passing through a first pore channel and a second pore channel, and feeding the core yarns in a linear direction; and the outer covering yarn is fed by an outer covering yarn spool and then enters the yarn guiding device, and the outer covering yarn straightening mechanism drives the outer covering yarn to rotate relative to the core yarn and spirally wind the outer covering yarn outside the core yarn through the yarn guiding device to form the flame-retardant and anti-electric arc covering yarn.
2. The method of claim 1, wherein: the spiral angle of the outer covering yarn relative to the radial direction of the core yarn is 30-60 degrees.
3. The method of claim 1, wherein: the ratio of the outer covering yarns to the core yarns is 1:8-10, the number of the core yarns is 1-6, and the number of the outer covering yarns is 6-12.
4. The method of claim 1, wherein: the core yarn has a diameter of 140D to 280D.
5. The method of claim 1, wherein: the modal-based graphene composite fiber comprises a modal fiber matrix and a plurality of graphene nanoparticles distributed in the modal fiber matrix, and a preparation raw material of the modal fiber matrix comprises cellulose pulp; the mass ratio of the graphene nanoparticles to the cellulose pulp is 12-15: 100.
6. The method of claim 1, wherein: the core yarn was fed at a speed of 5m/min and the outer covering yarn was spirally wound at an angular speed of 120-180 rad/min.
7. A flame-retardant arc-resistant covered yarn prepared by the preparation method of claim 1, characterized in that: the composite yarn comprises a core yarn and a plurality of outer covering yarns, wherein the core yarn is polyimide fiber, the outer covering yarns are Modal graphene composite fiber, the plurality of outer covering yarns are spirally wound outside the core yarn, and the included angle formed by the outer covering yarns and the axial direction of the core yarn is 30-60 degrees.
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| CN202110249234.XA CN113005585B (en) | 2021-03-08 | 2021-03-08 | Covered yarn spinning device and preparation method of flame-retardant and anti-electric arc covered yarn |
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| CN202110249234.XA CN113005585B (en) | 2021-03-08 | 2021-03-08 | Covered yarn spinning device and preparation method of flame-retardant and anti-electric arc covered yarn |
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