CN115058784A - Preparation method of polytetrafluoroethylene flat filament with high mass density uniformity - Google Patents
Preparation method of polytetrafluoroethylene flat filament with high mass density uniformity Download PDFInfo
- Publication number
- CN115058784A CN115058784A CN202210725682.7A CN202210725682A CN115058784A CN 115058784 A CN115058784 A CN 115058784A CN 202210725682 A CN202210725682 A CN 202210725682A CN 115058784 A CN115058784 A CN 115058784A
- Authority
- CN
- China
- Prior art keywords
- polytetrafluoroethylene
- flat
- filaments
- vertical oscillation
- mass density
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/42—Formation of filaments, threads, or the like by cutting films into narrow ribbons or filaments or by fibrillation of films or filaments
- D01D5/426—Formation of filaments, threads, or the like by cutting films into narrow ribbons or filaments or by fibrillation of films or filaments by cutting films
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D1/00—Treatment of filament-forming or like material
- D01D1/02—Preparation of spinning solutions
-
- 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
- D02J1/224—Selection or control of the temperature during stretching
-
- 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
- D02J13/00—Heating or cooling the yarn, thread, cord, rope, or the like, not specific to any one of the processes provided for in this subclass
-
- 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]
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Mechanical Engineering (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
Abstract
The invention discloses a preparation method of a polytetrafluoroethylene flat filament with high quality density uniformity, which comprises the following steps: firstly, carrying out vertical oscillation pretreatment on granular polytetrafluoroethylene dispersion powder to adjust the elongation of granules in the powder; secondly, mixing the vibrated polytetrafluoroethylene dispersion powder and the extrusion assisting oil agent in proportion to prepare paste and standing; thirdly, performing, extruding and rolling the paste after standing to obtain a rolled film; (IV) degreasing the rolled film; uniformly cutting the calendered film subjected to oil removal treatment to obtain initial polytetrafluoroethylene flat filaments; sixthly, carrying out hot drawing on the initial polytetrafluoroethylene flat filaments; (VII) hot-drawn sheetAnd carrying out heat setting on the flat filaments to obtain the polytetrafluoroethylene flat filaments. The mass density of the flat polytetrafluoroethylene filaments prepared by the method is in the range of 1.9-2.03g/cm 3 The coefficient of mass density variation is 3.8-5.4%.
Description
Technical Field
The invention relates to a preparation method of polytetrafluoroethylene filaments, in particular to a preparation method of polytetrafluoroethylene flat filaments with high quality, density and uniformity.
Background
Industrial fumes are a major source of atmospheric pollution and have become a common problem worldwide. At present, the industrial smoke filtering material is mainly a film-coated needled felt, wherein the needled felt is mainly prepared by processing functional fibers and reinforcing base cloth through a needling process, and the reinforcing base cloth is woven cloth woven by Polytetrafluoroethylene (PTFE) filaments. The polytetrafluoroethylene has good chemical stability, is insoluble in conventional solvents, is called as 'plastic king', has excellent high and low temperature resistance (minus 260-260 ℃) and has the characteristics of non-adhesiveness on the surface, low friction coefficient and the like, thereby becoming an ideal material for preparing the industrial smoke dust filter material base cloth.
Due to extremely high melt viscosity (1010-1011 Pa · S), the polytetrafluoroethylene filament cannot be prepared by a conventional melt extrusion method, a paste extrusion method or a cutting method is generally adopted at present, and the filter material base fabric is prepared from the polytetrafluoroethylene filament by the cutting method. The patent CN104294382A discloses a manufacturing process of a high-strength low-elongation polytetrafluoroethylene filament, in the invention, polytetrafluoroethylene dispersion powder is stood still in an environment with the temperature lower than 15 ℃ for balance adjustment, and then a conventional forming process is adopted to prepare the high-strength low-elongation polytetrafluoroethylene flat filament. Patent CN110528131A discloses a manufacturing process of high-strength low-friction polytetrafluoroethylene sewing thread, in which the original polytetrafluoroethylene flat filaments obtained by cutting are twisted and then hot-drawn to obtain a single-strand sewing thread. Patent CN101713101A discloses a method for producing polytetrafluoroethylene fiber filament, which comprises adhering and compounding polytetrafluoroethylene film and polyester film, cutting the compounded double-layer film, removing the polyester film, and hot-drawing the polytetrafluoroethylene film to prepare polytetrafluoroethylene filament.
In the prior art, the preparation process of the flat polytetrafluoroethylene filament adopts conventional polytetrafluoroethylene dispersion powder or direct processing or balanced processing of the powder, and then the flat polytetrafluoroethylene filament is prepared by paste preparation, preforming, extrusion forming, calendaring, slitting and other processes. In the prior art, particles in polytetrafluoroethylene dispersion powder raw materials are low in relative friction strength among particles in extrusion forming and calendering processes, so that fibril forming and distribution are uneven, a polytetrafluoroethylene structure in a flat filament is uneven, and the mass density of the flat filament is uneven finally.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, the technical problem to be solved by the present invention is how to improve the uniformity of mass density of polytetrafluoroethylene fibers.
In order to achieve the above object, the present invention provides a method for preparing a flat polytetrafluoroethylene filament with high uniformity of mass density, comprising the steps of:
firstly, carrying out vertical oscillation pretreatment on granular polytetrafluoroethylene dispersion powder to adjust the elongation of granules in the powder;
secondly, mixing the vibrated polytetrafluoroethylene dispersion powder and the extrusion assisting oil agent in proportion to prepare paste and standing;
thirdly, performing, extruding and rolling the paste after standing to obtain a rolled film;
(IV) degreasing the rolled film;
uniformly cutting the calendered film subjected to oil removal treatment to obtain initial polytetrafluoroethylene flat filaments;
sixthly, carrying out hot drawing on the initial polytetrafluoroethylene flat filaments;
and (seventhly), performing heat setting on the hot-drawn flat filaments to obtain the polytetrafluoroethylene flat filaments.
Further, in the step (one), the vertical oscillation pretreatment is carried out in a vertical oscillation device; the upper and lower vertical oscillation devices comprise an upper cover, a vertical oscillation groove, a vertical oscillation piston, a piston driving device and a base; the piston driving device arranged on the base can drive the vertical vibration piston to move up and down, so as to drive the vertical vibration groove to vibrate.
Further, in the step (I), the vertical oscillation frequency is 10-250 times/min, the vertical oscillation amplitude is 1-200 mm, the vertical oscillation time is 1-300 min, and the vertical oscillation ambient temperature is-40-50 ℃.
Furthermore, the elongation of particles in the polytetrafluoroethylene dispersion powder subjected to vertical oscillation pretreatment is 0.8-4.0. Preferably, the elongation is 1.0-3.1.
Further, in the step (II), the extrusion assisting oil agent is aviation kerosene.
Further, in the step (II), uniformly mixing the polytetrafluoroethylene dispersion powder and the aviation kerosene according to the mass ratio of 100: 10-30 to obtain a paste, and standing the paste in an environment with the temperature of 45-60 ℃ for 30-60 hours.
Furthermore, in the step (III), the thickness of the rolled film is 200-400 μm.
Further, in the step (V), the rolled film after the oil removal treatment is conveyed to a cutting device, and the initial polytetrafluoroethylene flat filaments with the number of 20-200 are uniformly cut, wherein the width of the initial polytetrafluoroethylene flat filaments is 0.5-3 mm.
Further, in the step (VI), the initial flat polytetrafluoroethylene filaments are conveyed to a hot drawing device for hot drawing processing, the temperature is 250-380 ℃, the number of groups of drawing points is 3-5, the drawing multiple is 20-40 times, the input speed is 0.4-1.0 m/min, and the output speed is 10-40 m/min.
Further, in the seventh step, the hot-drawn flat filaments are conveyed to a heat setting box body for heat setting processing, the temperature of the box body is 360-440 ℃, the input speed is 80-120 m/min, the output speed is 100-140 m/min, and the mass density range of the polytetrafluoroethylene flat filaments is 1.9-2.03g/cm 3 The coefficient of mass density variation is 3.8-5.4%.
Compared with the prior art, the invention has the following beneficial effects:
1) according to the invention, the granular polytetrafluoroethylene dispersion powder is subjected to oscillation preprocessing by adopting an up-and-down vertical oscillation technology, and the structural uniformity of the polytetrafluoroethylene flat filament is improved by improving the interaction strength among particles in the dispersion powder, so that the mass density uniformity of the flat filament is improved.
2) The preparation method of the polytetrafluoroethylene flat filament with high quality density uniformity provided by the invention has high production efficiency and can improve the yield.
The conception, specific structure and technical effects of the present invention will be further described in conjunction with the accompanying drawings to fully understand the purpose, characteristics and effects of the present invention.
Drawings
Fig. 1 is a schematic structural diagram of an up-down vertical oscillation device in a preferred embodiment of the present invention.
FIG. 2 is a schematic structural diagram of polytetrafluoroethylene particles in a preferred embodiment of the invention.
FIG. 3 is a process flow diagram of a preferred embodiment of the present invention.
Detailed Description
The technical contents of the preferred embodiments of the present invention will be more clearly and easily understood by referring to the drawings attached to the specification. The present invention may be embodied in many different forms of embodiments and the scope of the invention is not limited to the embodiments set forth herein.
As shown in FIG. 3, in the embodiment of the method for preparing a flat polytetrafluoroethylene filament with high uniformity of mass density according to the present invention, an up-down vertical oscillation apparatus is used as shown in FIG. 1. The device comprises an upper cover 1, a vertical oscillation groove 3, a vertical vibration piston 4, a piston driving device 5 and a base 6. The vertical vibration piston 4 is driven to move up and down by the piston driving device 5 disposed on the base 6, thereby driving the vertical vibration tank 3 to vibrate. When the PTEE dispersion powder is used, the PTEE dispersion powder is placed in the vertical oscillation tank 3, the upper cover 1 is covered, and after the oscillation frequency, the amplitude and the time are set, the vertical oscillation piston 4 is started to perform oscillation preprocessing in the first step. This application utilizes the cold flow nature of polytetrafluoroethylene powder granule, through the vertical oscillation granule from top to bottom for polytetrafluoroethylene elongation increases.
The elongation of the particles in this application is log2(a/b), as shown in fig. 2, where a is the major axis length of the ellipse to which the particles are fitted and b is the minor axis length of the ellipse to which the particles are fitted.
After the granular polytetrafluoroethylene dispersion powder vertically oscillates up and down, part of spherical particles extend (the relative sliding capacity among the spherical particles is strong, but the friction among the spherical particles is small, and fibrils are difficult to form); in order to form fibrils among the particles, the elongation of the particles is increased to increase the mutual frictional strength among the particles (namely, the relative slippage capacity among the particles is reduced), so that the amount of the fibrils is increased, and the subsequent acting force distribution is improved.
The relative slippage capacity among the particles is reduced along with the increase of the elongation of the particles, and when the relative slippage capacity is reduced to a certain degree, the number of fibrils among the dispersed particles is greatly reduced in the extrusion forming process, so that the number of fibrils among the particles in the extrusion forming body is reduced, the structural nonuniformity of the extrusion forming body is increased, and the uniformity of a final product is reduced. If the elongation of the particles is too large, the packing compactness among the particles is greatly increased, so that effective relative slippage among the particles cannot be formed in the extrusion forming process, and the structural unevenness of an end product is increased. I.e. the amount of fibrils between particles shows a tendency to increase and then decrease with increasing elongation of the particles.
Example 1
The method comprises the following steps of firstly, taking conventional granular polytetrafluoroethylene dispersion powder as a raw material, placing a certain amount of granular polytetrafluoroethylene dispersion powder in an up-down vertical oscillation device for up-down vertical oscillation preprocessing, wherein the up-down vertical oscillation frequency is 50 times/min, the up-down vertical oscillation amplitude is 10mm, the up-down vertical oscillation time is 15min, the up-down vertical oscillation environment temperature is 15 ℃, and the elongation of granules in the polytetrafluoroethylene dispersion powder subjected to the up-down vertical oscillation preprocessing is 1.0.
In this embodiment, an up-down vertical oscillation device is employed as shown in fig. 1. The device comprises an upper cover 1, a vertical oscillation groove 3, a vertical vibration piston 4, a piston driving device 5 and a base 6. The vertical vibration piston 4 is driven to move up and down by the piston driving device 5 disposed on the base 6, thereby driving the vertical vibration tank 3 to vibrate. When the PTEE dispersion powder is used, the PTEE dispersion powder is placed in the vertical oscillation tank 3, the upper cover 1 is covered, and after the oscillation frequency, the amplitude and the time are set, the vertical oscillation piston 4 is started to perform oscillation preprocessing in the first step.
Step two, mixing the polytetrafluoroethylene dispersion powder subjected to oscillation preprocessing with aviation kerosene, uniformly mixing the polytetrafluoroethylene dispersion powder and the aviation kerosene according to the mass ratio of 100:20 to obtain a paste, and standing the paste in an environment with the temperature of 55 ℃ for 50 hours;
pouring the paste left standing in the step two into a preforming device, pressurizing to prepare a preforming body, and performing extrusion forming and calendering to obtain a calendered film with the thickness of 250 microns;
step four, the rolled film in the step three passes through a box body with the temperature of 240 ℃ to evaporate aviation kerosene, wherein the input speed is 10m/min, and the output speed is 10 m/min;
and step five, conveying the calendered film subjected to oil removal in the step four to a cutting device, and uniformly cutting the drafted calendered film by using a cutting blade to obtain 80 initial polytetrafluoroethylene flat filaments. Wherein the width of the initial flat polytetrafluoroethylene filament is 1.5 mm;
conveying the flat filaments obtained in the step five to a hot drawing device for hot drawing processing, wherein the temperature is 360 ℃, the group number of drawing points is 4, the drawing multiple is 30 times, the input speed is 0.5m/min, and the output speed is 15 m/min;
and step seven, conveying the flat filaments subjected to the hot drawing in the step six to a heat setting box body for heat setting processing to prepare the polytetrafluoroethylene flat filaments with high density and uniformity. The temperature of the box body is 400 ℃, the input speed is 90m/min, the output speed is 120m/min, the mass density is 1.9g/cm3, and the coefficient of variation of the mass density is 5%.
Example 2
Step one, adopting conventional granular polytetrafluoroethylene dispersion powder as a raw material, placing a certain amount of granular polytetrafluoroethylene dispersion powder in an up-and-down vertical oscillation device to perform up-and-down vertical oscillation preprocessing treatment, wherein the up-and-down vertical oscillation frequency is 50 times/min, the up-and-down vertical oscillation amplitude is 10mm, the up-and-down vertical oscillation time is 50min, the up-and-down vertical oscillation environment temperature is 15 ℃, and the elongation of granules in the polytetrafluoroethylene dispersion powder subjected to the up-and-down vertical oscillation preprocessing treatment is 2.2.
Step two, mixing the polytetrafluoroethylene dispersion powder subjected to oscillation preprocessing with aviation kerosene, uniformly mixing the polytetrafluoroethylene dispersion powder and the aviation kerosene according to the mass ratio of 100:20 to obtain a paste, and standing the paste in an environment with the temperature of 55 ℃ for 50 hours;
pouring the paste left in the step two into a preforming device, pressurizing to prepare a preforming body, and carrying out extrusion forming and calendering to obtain a calendered film with the thickness of 250 micrometers;
step four, the rolled film in the step three passes through a box body with the temperature of 240 ℃ to evaporate aviation kerosene, wherein the input speed is 10m/min, and the output speed is 10 m/min;
and step five, conveying the calendered film subjected to oil removal in the step four to a cutting device, and uniformly cutting the drafted calendered film by using a cutting blade to obtain 80 initial polytetrafluoroethylene flat filaments. Wherein the width of the initial flat polytetrafluoroethylene filament is 1.5 mm;
conveying the flat filaments obtained in the step five to a hot drawing device for hot drawing processing, wherein the temperature is 360 ℃, the group number of drawing points is 4, the drawing multiple is 30 times, the input speed is 0.5m/min, and the output speed is 15 m/min;
and step seven, conveying the flat filaments subjected to the hot drawing in the step six to a heat setting box body for heat setting processing to prepare the polytetrafluoroethylene flat filaments with high density and uniformity. The temperature of the box body is 400 ℃, the input speed is 90m/min, the output speed is 120m/min, the mass density is 1.95g/cm3, and the coefficient of variation of the mass density is 3.8%.
Example 3
Step one, adopting conventional granular polytetrafluoroethylene dispersion powder as a raw material, placing a certain amount of granular polytetrafluoroethylene dispersion powder in an up-down vertical oscillation device for up-down vertical oscillation preprocessing, wherein the up-down vertical oscillation frequency is 60 times/min, the up-down vertical oscillation amplitude is 10mm, the up-down vertical oscillation time is 100min, the up-down vertical oscillation environment temperature is 15 ℃, and the elongation of granules in the polytetrafluoroethylene dispersion powder subjected to the up-down vertical oscillation preprocessing is 3.1.
Step two, mixing the polytetrafluoroethylene dispersion powder subjected to oscillation preprocessing with aviation kerosene, uniformly mixing the polytetrafluoroethylene dispersion powder and the aviation kerosene according to the mass ratio of 100:20 to obtain a paste, and standing the paste in an environment with the temperature of 55 ℃ for 50 hours;
pouring the paste left standing in the step two into a preforming device, pressurizing to prepare a preforming body, and performing extrusion forming and calendering to obtain a calendered film with the thickness of 250 microns;
step four, the rolled film in the step three passes through a box body with the temperature of 240 ℃ to evaporate aviation kerosene, wherein the input speed is 10m/min, and the output speed is 10 m/min;
and step five, conveying the calendered film subjected to oil removal in the step four to a cutting device, and uniformly cutting the drafted calendered film by using a cutting blade to obtain 80 initial polytetrafluoroethylene flat filaments. Wherein the width of the initial flat polytetrafluoroethylene filament is 1.5 mm;
conveying the flat filaments obtained in the step five to a hot drawing device for hot drawing processing, wherein the temperature is 360 ℃, the group number of drawing points is 4, the drawing multiple is 30 times, the input speed is 0.5m/min, and the output speed is 15 m/min;
and step seven, conveying the flat filaments subjected to the hot drawing in the step six to a heat setting box body for heat setting processing to prepare the polytetrafluoroethylene flat filaments with high density and uniformity. The temperature of the box body is 400 ℃, the input speed is 90m/min, the output speed is 120m/min, the mass density is 2.03g/cm3, and the coefficient of variation of the mass density is 5.4%.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (10)
1. A preparation method of polytetrafluoroethylene flat filaments with high quality density uniformity is characterized by comprising the following steps:
firstly, carrying out vertical oscillation pretreatment on granular polytetrafluoroethylene dispersion powder to adjust the elongation of granules in the powder;
secondly, mixing the vibrated polytetrafluoroethylene dispersion powder and the extrusion assisting oil agent in proportion to prepare paste and standing;
performing, extruding and rolling the paste after standing to obtain a rolled film;
(IV) degreasing the rolled film;
uniformly cutting the calendered film subjected to oil removal treatment to obtain initial polytetrafluoroethylene flat filaments;
sixthly, carrying out hot drawing on the initial polytetrafluoroethylene flat filaments;
and (seventhly), performing heat setting on the hot-drawn flat filaments to obtain the polytetrafluoroethylene flat filaments.
2. The method for preparing high-quality density-uniformity polytetrafluoroethylene flat filament according to claim 1, wherein in the step (one), the vertical oscillation pretreatment is performed in a vertical oscillation device; the upper and lower vertical oscillation devices comprise an upper cover, a vertical oscillation groove, a vertical oscillation piston, a piston driving device and a base; the piston driving device arranged on the base can drive the vertical vibration piston to move up and down, so as to drive the vertical vibration groove to vibrate.
3. The method for preparing flat polytetrafluoroethylene filaments with high mass density uniformity according to claim 2, wherein in step (one), the vertical oscillation frequency is 10 to 250 times/min, the vertical oscillation amplitude is 1 to 200mm, the vertical oscillation time is 1 to 300min, and the vertical oscillation environment temperature is-40 ℃ to 50 ℃.
4. The method for preparing flat polytetrafluoroethylene filaments having high mass density uniformity according to claim 3, wherein the polytetrafluoroethylene dispersion powder pretreated by vertical oscillation from top to bottom has an elongation of particles of 0.8 to 4.0.
5. The process for producing flat polytetrafluoroethylene filaments with high mass density uniformity according to claim 4, wherein in step (ii), the extrusion aid is jet fuel.
6. The method for producing flat polytetrafluoroethylene filaments with high mass density uniformity according to claim 5 wherein in step (II), the dispersed polytetrafluoroethylene powder and aviation kerosene are uniformly mixed in a mass ratio of 100: 10-30 to obtain a paste, and the paste is allowed to stand in an environment at a temperature of 45-60 ℃ for 30-60 hours.
7. The process for producing high-quality density-uniformity polytetrafluoroethylene flat filament according to claim 6, wherein in the third step, the thickness of the calendered film is 200 to 400 μm.
8. The method for preparing flat polytetrafluoroethylene filaments with high mass density uniformity according to claim 7, wherein in the step (V), the calendered film after being degreased is conveyed to a cutting device, and is uniformly cut to obtain 20 to 200 initial flat polytetrafluoroethylene filaments, and the width of the initial flat polytetrafluoroethylene filaments is 0.5 to 3 mm.
9. The method for preparing flat polytetrafluoroethylene filaments with high mass density uniformity according to claim 8, wherein in the sixth step, the initial flat polytetrafluoroethylene filaments are conveyed to a hot-drawing device for hot-drawing at a temperature of 250 ℃ to 380 ℃, the number of groups of drawing points is 3 to 5, the drawing ratio is 20 to 40, the input speed is 0.4 to 1.0m/min, and the output speed is 10 to 40 m/min.
10. The method for preparing flat polytetrafluoroethylene filaments with high mass density uniformity as claimed in claim 9, wherein in the seventh step, the hot-drawn flat filaments are conveyed to a heat-setting box for heat-setting processing, the box temperature is 360-440 ℃, the input speed is 80-120 m/min, the output speed is 100-140 m/min, and the mass density of the flat polytetrafluoroethylene filaments is 1.9-2.03g/cm 3 The coefficient of mass density variation is 3.8-5.4%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210725682.7A CN115058784B (en) | 2022-06-24 | 2022-06-24 | Preparation method of polytetrafluoroethylene flat filament with high quality density uniformity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210725682.7A CN115058784B (en) | 2022-06-24 | 2022-06-24 | Preparation method of polytetrafluoroethylene flat filament with high quality density uniformity |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115058784A true CN115058784A (en) | 2022-09-16 |
| CN115058784B CN115058784B (en) | 2023-09-08 |
Family
ID=83201910
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210725682.7A Active CN115058784B (en) | 2022-06-24 | 2022-06-24 | Preparation method of polytetrafluoroethylene flat filament with high quality density uniformity |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115058784B (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040175567A1 (en) * | 2003-01-20 | 2004-09-09 | Yeu Ming Tai Chemical Industrial Co., Ltd. | Polytetrafluoroethylene fiber and method for manufacturing the same |
| CN101944622A (en) * | 2004-06-28 | 2011-01-12 | 永备电池有限公司 | Alkali electrochemical battery with blended zinc powder |
| CN108144459A (en) * | 2016-12-02 | 2018-06-12 | 中国科学院大连化学物理研究所 | A kind of three strata tetrafluoroethene hollow fiber composite membranes |
| CN111635605A (en) * | 2019-12-30 | 2020-09-08 | 长春石油化学股份有限公司 | Ethylene-vinyl alcohol copolymer particles and films thereof |
| CN113005545A (en) * | 2021-03-09 | 2021-06-22 | 山东森荣新材料股份有限公司 | Preparation method of polytetrafluoroethylene ultra-fine filament |
| CN113046855A (en) * | 2021-03-23 | 2021-06-29 | 苏州大学 | Low linear density bundle-shaped polytetrafluoroethylene filament and preparation process and application thereof |
| CN113122942A (en) * | 2021-03-16 | 2021-07-16 | 苏州大学 | Large-scale preparation method of low-shrinkage polytetrafluoroethylene filaments |
| CN113215672A (en) * | 2021-03-02 | 2021-08-06 | 上海灵氟隆膜技术有限公司 | Preparation method of polytetrafluoroethylene continuous filament for fuel cell diaphragm |
-
2022
- 2022-06-24 CN CN202210725682.7A patent/CN115058784B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040175567A1 (en) * | 2003-01-20 | 2004-09-09 | Yeu Ming Tai Chemical Industrial Co., Ltd. | Polytetrafluoroethylene fiber and method for manufacturing the same |
| CN101944622A (en) * | 2004-06-28 | 2011-01-12 | 永备电池有限公司 | Alkali electrochemical battery with blended zinc powder |
| CN108144459A (en) * | 2016-12-02 | 2018-06-12 | 中国科学院大连化学物理研究所 | A kind of three strata tetrafluoroethene hollow fiber composite membranes |
| CN111635605A (en) * | 2019-12-30 | 2020-09-08 | 长春石油化学股份有限公司 | Ethylene-vinyl alcohol copolymer particles and films thereof |
| CN113215672A (en) * | 2021-03-02 | 2021-08-06 | 上海灵氟隆膜技术有限公司 | Preparation method of polytetrafluoroethylene continuous filament for fuel cell diaphragm |
| CN113005545A (en) * | 2021-03-09 | 2021-06-22 | 山东森荣新材料股份有限公司 | Preparation method of polytetrafluoroethylene ultra-fine filament |
| CN113122942A (en) * | 2021-03-16 | 2021-07-16 | 苏州大学 | Large-scale preparation method of low-shrinkage polytetrafluoroethylene filaments |
| CN113046855A (en) * | 2021-03-23 | 2021-06-29 | 苏州大学 | Low linear density bundle-shaped polytetrafluoroethylene filament and preparation process and application thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115058784B (en) | 2023-09-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US3016599A (en) | Microfiber and staple fiber batt | |
| CN1064093C (en) | Polytetrafluoroethylene fiber, cottony material containing the same, and process for producing the same | |
| CN1161506C (en) | Crimped multicomponent filaments and spunbond webs made therefrom | |
| DE3586699T2 (en) | METHOD AND APPARATUS FOR CENTRIFUGAL SPIDERS COMBINED WITH EXTRUSION. | |
| US5565158A (en) | Process for recycling multicomponent mixed polymer wastes | |
| US6949287B2 (en) | Polytetrafluoroethylene fiber and method for manufacturing the same | |
| JP2009545681A (en) | Fiber web comprising microfibers dispersed in bonded melt-spun fibers | |
| de Almeida et al. | Development and characterization of electrospun cellulose acetate nanofibers modified by cationic surfactant | |
| CN103132162B (en) | The preparation method of carbon fiber precursor | |
| CN112899796A (en) | Preparation method of high-strength regenerated nylon 66 fiber | |
| EP2363516A1 (en) | Method for manufacturing fibres from polymer dispersions | |
| DE69230436T2 (en) | METHOD FOR PRODUCING FLUOROPOLYMER COMPOSITES | |
| CN114908431B (en) | Preparation method of polytetrafluoroethylene extruded filaments with high mass density uniformity | |
| CN115058784A (en) | Preparation method of polytetrafluoroethylene flat filament with high mass density uniformity | |
| Ahmadi et al. | Enhancement of the mechanical properties of PAN nanofiber/carbon nanotube composite mats produced via needleless electrospinning system | |
| CN115110168A (en) | Method for manufacturing polytetrafluoroethylene fibers with high mass density uniformity | |
| Sunny et al. | Alignment of short fibres: an overview | |
| CN113122942B (en) | Large-scale preparation method of low-shrinkage polytetrafluoroethylene filaments | |
| US10676614B2 (en) | High molecular and low molecular weight fine fibers and TPU fine fibers | |
| CN1049193A (en) | Yarn silk and production technology thereof that the two component long filaments of core-skin type form | |
| KR100195383B1 (en) | Method for making needled nonwoven fabrics | |
| RU2181325C2 (en) | Method and apparatus for making polytetrafluoroethylene sheet and device for pelletizing-mixing | |
| US3010865A (en) | Method of making elastomeric webs | |
| CN108315826B (en) | Filtration regeneration system of old and useless non-woven fabrics | |
| Senthil et al. | Solution electrospinning of styrene-acrylonitrile random copolymer from dimethyl sulfoxide |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |