CN114134606A - Polytetrafluoroethylene bulked yarn and preparation method of textile prepared from same - Google Patents
Polytetrafluoroethylene bulked yarn and preparation method of textile prepared from same Download PDFInfo
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- CN114134606A CN114134606A CN202111499721.8A CN202111499721A CN114134606A CN 114134606 A CN114134606 A CN 114134606A CN 202111499721 A CN202111499721 A CN 202111499721A CN 114134606 A CN114134606 A CN 114134606A
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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
- D02G3/24—Bulked yarns or threads, e.g. formed from staple fibre components with different relaxation characteristics
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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
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- D—TEXTILES; PAPER
- D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
- D02J—FINISHING OR DRESSING OF FILAMENTS, YARNS, THREADS, CORDS, ROPES OR THE LIKE
- D02J1/00—Modifying the structure or properties resulting from a particular structure; Modifying, retaining, or restoring the physical form or cross-sectional shape, e.g. by use of dies or squeeze rollers
- D02J1/02—Bulking, e.g. looping
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- D—TEXTILES; PAPER
- D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
- D02J—FINISHING OR DRESSING OF FILAMENTS, YARNS, THREADS, CORDS, ROPES OR THE LIKE
- D02J1/00—Modifying the structure or properties resulting from a particular structure; Modifying, retaining, or restoring the physical form or cross-sectional shape, e.g. by use of dies or squeeze rollers
- D02J1/22—Stretching or tensioning, shrinking or relaxing, e.g. by use of overfeed and underfeed apparatus, or preventing stretch
- D02J1/222—Stretching in a gaseous atmosphere or in a fluid bed
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- D—TEXTILES; PAPER
- D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
- D02J—FINISHING OR DRESSING OF FILAMENTS, YARNS, THREADS, CORDS, ROPES OR THE LIKE
- D02J1/00—Modifying the structure or properties resulting from a particular structure; Modifying, retaining, or restoring the physical form or cross-sectional shape, e.g. by use of dies or squeeze rollers
- D02J1/22—Stretching or tensioning, shrinking or relaxing, e.g. by use of overfeed and underfeed apparatus, or preventing stretch
- D02J1/228—Stretching in two or more steps, with or without intermediate steps
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- D—TEXTILES; PAPER
- D03—WEAVING
- D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
- D03D13/00—Woven fabrics characterised by the special disposition of the warp or weft threads, e.g. with curved weft threads, with discontinuous warp threads, with diagonal warp or weft
- D03D13/008—Woven fabrics characterised by the special disposition of the warp or weft threads, e.g. with curved weft threads, with discontinuous warp threads, with diagonal warp or weft characterised by weave density or surface weight
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- D—TEXTILES; PAPER
- D03—WEAVING
- D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
- D03D15/00—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used
- D03D15/20—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the material of the fibres or filaments constituting the yarns or threads
- D03D15/283—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the material of the fibres or filaments constituting the yarns or threads synthetic polymer-based, e.g. polyamide or polyester fibres
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06C—FINISHING, DRESSING, TENTERING OR STRETCHING TEXTILE FABRICS
- D06C7/00—Heating or cooling textile fabrics
- D06C7/02—Setting
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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
- D10B2321/00—Fibres made from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D10B2321/04—Fibres made from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds polymers of halogenated hydrocarbons
- D10B2321/042—Fibres made from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds polymers of halogenated hydrocarbons polymers of fluorinated hydrocarbons, e.g. polytetrafluoroethene [PTFE]
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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
- D10B2505/00—Industrial
- D10B2505/04—Filters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
- Y02P70/62—Manufacturing or production processes characterised by the final manufactured product related technologies for production or treatment of textile or flexible materials or products thereof, including footwear
Abstract
The invention discloses a preparation method of polytetrafluoroethylene bulked yarn and a textile prepared from the same, belonging to the technical field of preparation and application of the polytetrafluoroethylene bulked yarn and comprising the following steps: s1, mixing the polytetrafluoroethylene dispersion resin with an auxiliary agent, uniformly stirring, and preserving at constant temperature; s2, putting the substance obtained in the step S1 into a die, forming a cylinder through die pressing, and extruding the cylinder into filaments through die pressing; s3, removing the auxiliary agent in the silk strips in the S2 through a constant-temperature oven; s4, semi-sintering the filament in the S3 through a sintering oven; and S5, heating and drafting the filaments obtained in the S4 through a drafting oven to finally obtain the polytetrafluoroethylene bulked yarns. The surface of the expanded polytetrafluoroethylene yarn produced by the invention has a honeycomb micropore structure, the production link is simple, the efficiency is high, and the gram weight is light; the polytetrafluoroethylene bulked yarn is applied and processed in the woven fabric, so that the woven fabric has the effect of bulked cloth surface, and the gram weight is reduced.
Description
Technical Field
The invention relates to the technical field of preparation and application of polytetrafluoroethylene bulked yarns, in particular to a preparation method of polytetrafluoroethylene bulked yarns and a textile prepared from the polytetrafluoroethylene bulked yarns.
Background
The polytetrafluoroethylene fiber has the characteristics of acid resistance, alkali resistance and various organic solvents resistance, and is almost insoluble in all solvents. Is one of the best materials with corrosion resistance in the world today. Meanwhile, the polytetrafluoroethylene fiber has the characteristics of high strength, low shrinkage, high temperature resistance, extremely low friction coefficient, high ultraviolet resistance and aging resistance and the like, so that the PTFE fiber is widely applied to the fields of machinery, chemistry, medical treatment, spinning and the like, and has wide application in the advanced science and technology field and the national defense industry. At present, with continuous release of national solid waste treatment policy and strong support of local government in recent years, the solid waste treatment market is gradually opened. According to the national conditions and the technical maturity of China, the waste incineration power generation is the most appropriate, mature and reliable mode for solving the waste problems of China at present. With the continuous improvement of living standard and the high-speed promotion of urbanization, the production amount of domestic garbage in China is increased year by year, and the harmless treatment rate of the domestic garbage is also improved year by year. The needled felt filter bag made of polytetrafluoroethylene fibers is a key accessory for filtering waste incineration smoke dust, and the annual demand increases year by year. And because the polytetrafluoroethylene product belongs to a non-renewable polymer product. In order to increase the use efficiency of the fluorine material, the fluorine material with unit weight exerts the maximum efficiency, and the fiber is expanded, so that the gram weight is reduced while the filtration efficiency is ensured.
Disclosure of Invention
1. Technical problem to be solved
The invention relates to a preparation method of polytetrafluoroethylene bulked yarn and a textile prepared from the same; the density of the produced expanded polytetrafluoroethylene yarn is 0.3-0.7 Ag/cm, the surface of the produced expanded polytetrafluoroethylene yarn has a honeycomb microporous structure, the production link is simple, the efficiency is high, and the gram weight is light; the expanded polytetrafluoroethylene yarn is applied and processed in the woven fabric, so that the woven fabric has the effect of expanding the cloth cover, the gram weight is reduced, the cohesive force among the yarns is enhanced, and dust is effectively filtered; can realize stable continuous industrial production, shorten the production time and the working procedure and reduce the cost.
2. Technical scheme
In order to solve the problems, the invention adopts the following technical scheme:
a preparation method of polytetrafluoroethylene bulked yarns comprises the following steps:
s1, mixing the polytetrafluoroethylene dispersion resin with an auxiliary agent, uniformly stirring, and preserving at constant temperature;
s2, putting the substance obtained in the step S1 into a die, forming a cylinder through die pressing, and extruding the cylinder into filaments through die pressing;
s3, removing the auxiliary agent in the silk strips in the S2 through a constant-temperature oven;
s4, semi-sintering the filaments in the S3 through a sintering oven, performing primary stretching in the semi-sintering process, and flushing hot-flow gas into the fiber structure of the filaments in the stretching process to achieve the effect of instant bulkiness;
and S5, heating and drafting the filaments obtained in the S4 through a drafting oven to finally obtain the polytetrafluoroethylene bulked yarns.
Preferably, the constant temperature preservation time in S1 is 8-12 hours.
Preferably, the semi-sintered heat-conducting medium in S4 is air, and the semi-sintering temperature is between 260 ℃ and 327 ℃.
Preferably, the stretching ratio in S4 is 2 to 4.
Preferably, the heat-conducting medium in the drawing oven in S5 is roller contact heat transfer.
The polytetrafluoroethylene bulked yarn is prepared by the preparation method.
Further, the fineness of the expanded polytetrafluoroethylene yarn is 450D-1600D, the density is 0.3-0.7 Ag/cm and the diameter is 0.3-0.6 mm.
A method for preparing a textile made of polytetrafluoroethylene bulked yarns comprises the following steps:
mixing polytetrafluoroethylene bulked yarns and polytetrafluoroethylene 500D high-strength filaments together according to a ratio of 1: 1-10: 1 to serve as weft yarns, mixing the polytetrafluoroethylene bulked yarns and the polytetrafluoroethylene 500D high-strength filaments together according to a ratio of 1: 1-10: 1 to serve as warp yarns, and warping;
step two, after warping weft yarns and warp yarns, performing plain weave or twill weave on a rapier loom to finally prepare polytetrafluoroethylene bulked woven fabric;
step three, carrying out heat setting treatment on the polytetrafluoroethylene bulked woven fabric by a high-temperature setting oven, wherein the setting temperature is 200-350 ℃.
Further, the warping speed is 100-300 m/min.
Further, the density of the warp yarns is between 30 and 50 yarns/inch, the density of the weft yarns is between 40 and 50 yarns/inch, and the rotating speed of the weaving machine is 200 and 500 revolutions/minute.
Further, the length of an effective heating area of the high-temperature shaping oven is 10-20 meters; the setting speed is 2-12 m/min.
3. Advantageous effects
1. According to the invention, polytetrafluoroethylene dispersion resin and an auxiliary agent are mixed, and are sequentially subjected to constant-temperature preservation, strand silk extrusion, auxiliary agent removal, semi-sintering, primary stretching, secondary stretching and other steps to prepare the polytetrafluoroethylene bulked yarn, wherein the primary stretching is carried out under a certain high-temperature environment, and heat flow gas is flushed into a fiber structure of the strand silk in the stretching process, so that an instant bulking effect is achieved, thus a microporous structure is endowed to the yarn, the yarn has a honeycomb effect, and compared with the conventional polytetrafluoroethylene yarn, the density of the yarn is greatly reduced, and the specific surface area is effectively increased.
2. In the invention, the finished product of the expanded yarn can be obtained after the secondary drafting without twisting, so that the manufacturing process of the polytetrafluoroethylene expanded yarn is relatively simple, and the preparation of the finished polytetrafluoroethylene expanded yarn is facilitated.
3. The secondary drafting of the strand silk is carried out in a drafting oven, and the heat-conducting medium in the oven conducts heat in a roller contact way, so that the feathers of the fibrous hairiness on the surface are passivated, and the wear-resisting effect is achieved.
4. Compared with the conventional expanded polytetrafluoroethylene yarn with the same linear density, the expanded polytetrafluoroethylene yarn has the expanded effect which is 6-8 times that of the conventional expanded polytetrafluoroethylene yarn, and the unit gram weight of a woven fabric textile made of the expanded polytetrafluoroethylene yarn is 1/3 of the conventional needled felt, so that the production cost and the raw material consumption are greatly reduced.
5. The polytetrafluoroethylene bulked woven fabric is a conventional processing technology, so that the production difficulty of the product is reduced, and the polytetrafluoroethylene bulked yarns can be produced in a large scale; and the investment of the equipment required by the production of the expanded polytetrafluoroethylene yarn is greatly reduced compared with the equipment for processing the polytetrafluoroethylene needled felt conventionally, the cost for manufacturing the yarn is saved, and in addition, the fiber cohesive force of the woven fabric is far higher than that of the needled felt, so that the warp and weft tensile strength is improved by times when the gram weight is the same. The service life of the polytetrafluoroethylene bulked yarn is prolonged.
6. The manufacturing procedure of the woven fabric made of the expanded polytetrafluoroethylene yarns is reduced compared with the production procedure of the needled felt, the needled felt needs to make the yarns into the base fabric, and then the base fabric is subjected to fiber lapping, needling and shaping, and the expanded polytetrafluoroethylene woven fabric can be finished products only through weaving, so that the production time and the procedures are shortened, and the cost is effectively reduced.
7. The woven fabric has stable size and higher raw material utilization rate than that of the needled felt, the selvages of the woven fabric are neat, the woven fabric can be made into a fixed width according to needs, and a subsequent cutting process is not needed, so that the woven fabric can be utilized in a full width, and the selvages at the edge of the needled felt need to be cut off first when in use, which increases the cutting process and causes the waste of raw materials.
In conclusion, the density of the expanded polytetrafluoroethylene yarn produced by the method is 0.3-0.7 Ag/cm, the surface of the expanded polytetrafluoroethylene yarn has a honeycomb microporous structure, the production link is simple, the efficiency is high, and the gram weight is light; the expanded polytetrafluoroethylene yarn is applied and processed in the woven fabric, so that the woven fabric has the effect of expanding the cloth cover, the gram weight is reduced, the cohesive force among the yarns is enhanced, and dust is effectively filtered; can realize stable continuous industrial production, shorten the production time and the working procedure and reduce the cost.
Detailed Description
The present invention will be described in further detail with reference to examples.
Example 1
A preparation method of polytetrafluoroethylene bulked yarns comprises the following steps:
s1, mixing the polytetrafluoroethylene dispersion resin with an auxiliary agent, uniformly stirring, and preserving at constant temperature for 8 hours;
s2, putting the substance obtained in the step S1 into a die, forming a cylinder through die pressing, and extruding the cylinder into filaments through die pressing;
s3, removing the auxiliary agent in the silk strips in the S2 through a constant-temperature oven;
s4, semi-sintering the filaments in the S3 through a sintering oven, wherein the semi-sintered heat-conducting medium is air, the semi-sintering temperature is 300 ℃, primary stretching is carried out in the semi-sintering process, the stretching multiple is 2 times, and heat flow gas is flushed into the fiber structure of the filaments in the stretching process to achieve the effect of instant bulk;
s5, heating and drafting the filaments obtained in the step S4 by a drafting oven to finally obtain the expanded polytetrafluoroethylene yarn, wherein the heat-conducting medium in the drafting oven conducts heat in a roller contact manner, and the heat-conducting manner aims to passivate the feathers on the surfaces of the filaments so as to achieve the wear-resisting effect.
Example 2
A preparation method of polytetrafluoroethylene bulked yarns comprises the following steps:
s1, mixing the polytetrafluoroethylene dispersion resin with an auxiliary agent, uniformly stirring, and preserving at constant temperature for 12 hours;
s2, putting the substance obtained in the step S1 into a die, forming a cylinder through die pressing, and extruding the cylinder into filaments through die pressing;
s3, removing the auxiliary agent in the silk strips in the S2 through a constant-temperature oven;
s4, semi-sintering the filaments in the S3 through a sintering oven, wherein the semi-sintered heat-conducting medium is air, the semi-sintering temperature is 260 ℃ and the semi-sintering temperature is 3 times, primary stretching is carried out in the semi-sintering process, and hot flow gas rushes into the fiber structure of the filaments in the stretching process to achieve the effect of instant bulk;
s5, heating and drafting the filaments obtained in the step S4 by a drafting oven to finally obtain the expanded polytetrafluoroethylene yarn, wherein the heat-conducting medium in the drafting oven conducts heat in a roller contact manner, and the heat-conducting manner aims to passivate the feathers on the surfaces of the filaments so as to achieve the wear-resisting effect.
Example 3
A preparation method of polytetrafluoroethylene bulked yarns comprises the following steps:
s1, mixing the polytetrafluoroethylene dispersion resin with an auxiliary agent, uniformly stirring, and preserving at constant temperature for 10 hours;
s2, putting the substance obtained in the step S1 into a die, forming a cylinder through die pressing, and extruding the cylinder into filaments through die pressing;
s3, removing the auxiliary agent in the silk strips in the S2 through a constant-temperature oven;
s4, semi-sintering the filaments in the S3 through a sintering oven, wherein the semi-sintered heat-conducting medium is air, the semi-sintering temperature is 327 ℃, primary stretching is carried out in the semi-sintering process, the stretching multiple is 4 times, and hot flow gas rushes into the fiber structure of the filaments in the stretching process to achieve the effect of instant bulk;
s5, heating and drafting the filaments obtained in the step S4 by a drafting oven to finally obtain the expanded polytetrafluoroethylene yarn, wherein the heat-conducting medium in the drafting oven conducts heat in a roller contact manner, and the heat-conducting manner aims to passivate the feathers on the surfaces of the filaments so as to achieve the wear-resisting effect.
The fineness of the expanded polytetrafluoroethylene yarn finally obtained in the three embodiments is 450D-1600D, the density is 0.3-0.7 Ag/cm and the diameter is 0.3-0.6 mm.
Example 4
A preparation method of a textile prepared from the polytetrafluoroethylene bulked yarn comprises the following steps:
step one, mixing a polytetrafluoroethylene bulked yarn and a polytetrafluoroethylene 500D high-strength filament together according to a ratio of 1:1 to obtain weft yarns, mixing a polytetrafluoroethylene bulked yarn and a polytetrafluoroethylene 500D high-strength filament together according to a ratio of 1:1 to obtain warp yarns, warping, wherein the density of the warp yarns is 30 yarns/inch, and preparing a beam with required breadth by using a sectional warping process, wherein the warping speed is 100 m/min, and the density of the warp yarns is 30 yarns/inch;
and step two, after warping weft yarns and warp yarns, performing plain weaving on a rapier loom to finally prepare polytetrafluoroethylene bulked woven fabric, wherein the rotating speed of the loom is 200 revolutions per minute.
Thirdly, carrying out heat setting treatment on the polytetrafluoroethylene bulked woven fabric by a high-temperature setting oven, wherein the length of an effective heating area of the high-temperature setting oven is 10 meters; the setting temperature is 350 ℃, and the setting speed is 12 m/min.
Example 5
A preparation method of a textile prepared from the polytetrafluoroethylene bulked yarn comprises the following steps:
mixing polytetrafluoroethylene bulked yarns and polytetrafluoroethylene 500D high-strength filaments together according to the proportion of 6:1 to obtain weft yarns, mixing the polytetrafluoroethylene bulked yarns and the polytetrafluoroethylene 500D high-strength filaments together according to the proportion of 6:1 to obtain warp yarns, warping, wherein the density of the warp yarns is 40 yarns/inch, and manufacturing a weaving beam with required width by using a sectional warping process, wherein the warping speed is 300 meters/minute, and the density of the warp yarns is 40 yarns/inch;
and step two, after warping weft yarns and warp yarns, twill weaving is carried out on a rapier loom, and finally polytetrafluoroethylene bulked woven fabric is manufactured, wherein the rotating speed of the loom is 400 revolutions per minute.
Thirdly, carrying out heat setting treatment on the polytetrafluoroethylene bulked woven fabric by using a high-temperature setting oven, wherein the length of an effective heating area of the high-temperature setting oven is 20 meters; the setting temperature is 200 ℃, and the setting speed is 2 m/min.
Example 6
A preparation method of a textile prepared from the polytetrafluoroethylene bulked yarn comprises the following steps:
step one, mixing polytetrafluoroethylene bulked yarns and polytetrafluoroethylene 500D high-strength filaments together according to a ratio of 10:1 to obtain weft yarns, mixing one polytetrafluoroethylene bulked yarn and one polytetrafluoroethylene 500D high-strength filament together according to a ratio of 10:1 to obtain warp yarns, warping the warp yarns, wherein the density of the warp yarns is 50 yarns/inch, and manufacturing a beam with required breadth by using a sectional warping process, wherein the warping speed is 200 m/min, and the density of the warp yarns is 50 yarns/inch;
and step two, after warping weft yarns and warp yarns, carrying out plain weaving on a rapier loom to finally prepare polytetrafluoroethylene bulked woven fabric, wherein the rotating speed of the loom is 500 r/min.
Thirdly, carrying out heat setting treatment on the polytetrafluoroethylene bulked woven fabric by using a high-temperature setting oven, wherein the length of an effective heating area of the high-temperature setting oven is 15 meters; the setting temperature is 300 ℃, and the setting speed is 8 m/min.
The woven cloth of the polytetrafluoroethylene bulker prepared in the examples 4-6 has the gram weight of 550 grams of 450-. The radial strength reaches more than 2000N, the latitudinal strength is more than 1350N, and the strength is improved by 30-50% compared with the warp and weft strength of a polytetrafluoroethylene needled felt which is not less than 800N. The radial elongation is 8-15%, and the latitudinal elongation is 6-10%. The heat shrinkage rate is less than or equal to 3 percent. The air permeability is 160L-200L/square meter per square meter @200 MPa. The thickness of the cloth cover is 0.3mm-0.6 mm.
It should be understood by those skilled in the art that the above embodiments are only for illustrating the present invention and are not to be used as a limitation of the present invention, and that changes and modifications to the above embodiments are within the scope of the claims of the present invention as long as they are within the spirit and scope of the present invention.
Claims (10)
1. The preparation method of the polytetrafluoroethylene bulked yarn is characterized by comprising the following steps:
s1, mixing the polytetrafluoroethylene dispersion resin with an auxiliary agent, uniformly stirring, and preserving at constant temperature;
s2, putting the substance obtained in the step S1 into a die, forming a cylinder through die pressing, and extruding the cylinder into filaments through die pressing;
s3, removing the auxiliary agent in the silk strips in the S2 through a constant-temperature oven;
s4, semi-sintering the filaments in the S3 through a sintering oven, performing primary stretching in the semi-sintering process, and flushing hot-flow gas into the fiber structure of the filaments in the stretching process to achieve the effect of instant bulkiness;
and S5, heating and drafting the filaments obtained in the S4 through a drafting oven to finally obtain the polytetrafluoroethylene bulked yarns.
2. The method for preparing expanded polytetrafluoroethylene yarn according to claim 1, wherein the expanded polytetrafluoroethylene yarn is kept at a constant temperature in S1 for 8-12 hours.
3. The method for preparing the expanded polytetrafluoroethylene yarn according to claim 1, wherein the semi-sintered heat-conducting medium in S4 is air, and the semi-sintering temperature is 260-327 ℃.
4. The method of claim 1, wherein the stretching in S4 is 2 to 4 times.
5. The method for preparing the expanded polytetrafluoroethylene yarn according to claim 1, wherein the heat transfer medium in the drawing oven in the S5 is roller contact heat transfer.
6. A polytetrafluoroethylene bulked yarn produced by the production method according to any one of claims 1 to 5.
7. The bulked polytetrafluoroethylene yarn according to claim 6, wherein said bulked polytetrafluoroethylene yarn has a fineness between 450D and 1600D, a density between 0.3 and 0.7 Ag/cm, and a gauge between 0.3 and 0.6 mm.
8. A method of making a textile product made from the expanded polytetrafluoroethylene yarn of claim 7, comprising the steps of:
mixing polytetrafluoroethylene bulked yarns and polytetrafluoroethylene 500D high-strength filaments together according to a ratio of 1: 1-10: 1 to serve as weft yarns, mixing the polytetrafluoroethylene bulked yarns and the polytetrafluoroethylene 500D high-strength filaments together according to a ratio of 1: 1-10: 1 to serve as warp yarns, and warping;
step two, after warping weft yarns and warp yarns, performing plain weave or twill weave on a rapier loom to finally prepare polytetrafluoroethylene bulked woven fabric;
step three, carrying out heat setting treatment on the polytetrafluoroethylene bulked woven fabric by a high-temperature setting oven of 10-20 meters, wherein the setting temperature is 200-350 ℃.
9. The method as claimed in claim 8, wherein the warping speed is 100-300 m/min.
10. The method as claimed in claim 8, wherein the warp density is 30-50/inch, the weft density is 40-50/inch, and the loom rotation speed is 200-500 rpm.
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