CN113122950B - Rapid manufacturing method of polytetrafluoroethylene fiber - Google Patents
Rapid manufacturing method of polytetrafluoroethylene fiber Download PDFInfo
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- CN113122950B CN113122950B CN202110282548.XA CN202110282548A CN113122950B CN 113122950 B CN113122950 B CN 113122950B CN 202110282548 A CN202110282548 A CN 202110282548A CN 113122950 B CN113122950 B CN 113122950B
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- polytetrafluoroethylene
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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
- D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
- D01F6/44—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds as major constituent with other polymers or low-molecular-weight compounds
- D01F6/48—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds as major constituent with other polymers or low-molecular-weight compounds of polymers of halogenated hydrocarbons
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H57/00—Guides for filamentary materials; Supports therefor
- B65H57/14—Pulleys, rollers, or rotary bars
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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
- D01F1/00—General methods for the manufacture of artificial filaments or the like
- D01F1/02—Addition of substances to the spinning solution or to the melt
- D01F1/10—Other agents for modifying properties
Abstract
The invention discloses a rapid manufacturing method of polytetrafluoroethylene fibers, which comprises the following steps: firstly, mixing polytetrafluoroethylene dispersion powder and extrusion assisting oil agent according to a certain mass ratio to prepare paste, and standing for a period of time. And then performing preforming, extrusion forming and calendaring on the paste after standing to obtain a sintered film, and finally performing oil removal, hot drawing, film cracking and carding to prepare a polytetrafluoroethylene fiber bundle and winding the polytetrafluoroethylene fiber bundle into a coil. The method adopts a pair of smooth guide rollers with convex structures on the surfaces to receive the sintered film prepared by hot drawing, and then uses a pair of rubber rollers to convey the sintered film to the film cracking roller, so that the method can avoid the sintered film from being folded, improve the finished product rate of polytetrafluoroethylene fibers, adapt to high-speed production of polytetrafluoroethylene, improve the production speed from 30-40 m/min to 60-80 m/min, and greatly improve the production efficiency.
Description
Technical Field
The invention relates to the field of preparation of polytetrafluoroethylene fibers, in particular to a rapid manufacturing method of polytetrafluoroethylene fibers.
Background
The fluorine atoms on the molecular chain surface of Polytetrafluoroethylene (PTFE) are arranged in a spiral shape, which endows the PTFE with excellent chemical stability, except for molten alkali metal and self-fluorinated substances, the PTFE is insoluble in any other solvent and is called as "plastic king". In addition, PTFE also has excellent high and low temperature resistance and can work for a long time in the environment of-260 ℃. The excellent corrosion resistance and excellent thermal stability make PTFE have wide application in the field of industrial dust removal, especially in the field of waste incineration smoke dust filtration.
The PTFE fiber for preparing the industrial dedusting filter material is prepared by adopting a membrane cracking technology. Patent CN106381537A discloses a method for producing PTFE staple fibers, which is based on the conventional PTFE split fiber forming technique and adopts the mixing of PTFE dispersion powders with different particle sizes to improve the strength of PTFE fibers. Patent CN207973830U discloses a system for preparing PTFE short fibers by using materials with different molecular weights, which performs flow configuration design on specific equipment in the PTFE short fiber forming process.
In the prior art, many efforts are made on the aspects of the forming technology and the fiber performance of PTFE fibers, but no solution is found for the problems of sintering film folding and low production speed in the forming process of the PTFE fibers.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a rapid manufacturing method of polytetrafluoroethylene fibers, which can avoid the folding of a sintered film, improve the production speed of the polytetrafluoroethylene fibers and solve the problems in the background art.
In order to achieve the purpose, the invention provides the following technical scheme: a method for rapidly preparing polytetrafluoroethylene fiber comprises mixing polytetrafluoroethylene dispersion powder with extrusion-assisting oil to obtain paste, standing in proper temperature environment for a period of time; then pouring the paste after standing into a preforming device to be pressurized to prepare a preforming body, and then carrying out extrusion forming, calendaring, oil removing, hot drawing, film cracking, carding and winding to prepare polytetrafluoroethylene fibers; the method comprises the following specific steps:
step S1, adopting polytetrafluoroethylene dispersion powder as a raw material and aviation kerosene as an extrusion assisting oil agent, uniformly mixing the polytetrafluoroethylene dispersion powder and the aviation kerosene according to a certain mass ratio to obtain a paste material, and standing the paste material for a period of time;
step S2, pouring the paste left standing in the step S1 into a preforming device, pressurizing to prepare a preforming body, and then carrying out extrusion forming and calendering to obtain a calendered film;
s3, evaporating the aviation kerosene by the calendered film in the S2 through a box body with the temperature of 220-250 ℃, and then performing hot drawing through the box body with the temperature of 380-420 ℃ to obtain a sintered film;
and S4, inputting the sintered film in the step S3 into a pair of smooth guide rollers, conveying the sintered film to a film cracking roller and a carding roller through a pair of rubber rollers, and finally winding to prepare a polytetrafluoroethylene fiber bundle.
Preferably, the molecular weight of the polytetrafluoroethylene dispersion powder is >1000 million.
Preferably, the mass ratio of the polytetrafluoroethylene dispersed powder to the aviation kerosene in the step S1 is 10:1 to 3.
Preferably, the temperature condition of the paste standing in the step S1 is 45-60 ℃, and the standing time is 25-40 hours.
Preferably, the thickness of the rolled film obtained in step S2 is 150 to 250 μm.
Preferably, the input speed of the hot drawing in the step S3 is 4-6 m/min, and the output speed is 60-80 m/min.
Preferably, the input speed of the sintering film in the step S4 is 60-80 m/min, and the winding speed of the polytetrafluoroethylene fiber bundle is 60-80 m/min.
Preferably, the pair of smooth guide rollers in step S4 is a pair of smooth guide rollers with convex surfaces, specifically, a first smooth guide roller and a second smooth guide roller; the pair of rubber rollers in step S4 is specifically an upper rubber roller and a lower rubber roller.
Preferably, a space exists between center lines of the first smooth guide roller and the second smooth guide roller; the centers of the upper rubber roller and the lower rubber roller are on a vertical line, and the vertical distance between the upper rubber roller and the lower rubber roller is the same as the diameter of the rubber rollers.
Preferably, the horizontal spacing between the centers of the first smooth guide roller and the second smooth guide roller is 100-300 mm, and the vertical spacing is 100-300 mm.
Preferably, the diameter of the minimum section of the first smooth guide roller is 10mm, the length of the first smooth guide roller is 200-300 mm, the maximum height of the central bulge is 40-80mm, the diameter and the length of the minimum section of the second smooth guide roller are consistent with those of the first smooth guide roller, and the maximum height of the central bulge of the second smooth guide roller is 10-20 mm; the length of going up the rubber roller is 200 ~ 300mm, the diameter is 60 ~ 80mm, and the length, the diameter of lower rubber roller all are unanimous with last rubber roller.
The invention has the beneficial effects that:
1) the invention adopts a pair of convex smooth guide rollers and a pair of rubber rollers to receive the sintered film, adopts the guide roller with a convex middle part, can properly improve the tension of the middle part of the sintered film, further improve the holding force of the guide roller to the sintered film, avoid the sintered film from moving and folding on the surface of the guide roller to cause the stop of a production line, improve the production continuity of the polytetrafluoroethylene fiber and reduce the defective quantity of the polytetrafluoroethylene fiber.
2) The invention adopts a pair of convex smooth guide rollers and a pair of rubber rollers to hold and transmit the sintering film, which can improve the stability of the transmission of the sintering film and the production speed of the polytetrafluoroethylene fiber.
3) The method can adapt to high-speed production of the polytetrafluoroethylene, can increase the production speed from 30-40 m/min to 60-80 m/min, and greatly improves the production efficiency.
Drawings
FIG. 1 is a front view of a smooth guide roller and rubber roller arrangement;
FIG. 2 is a left side view of a smooth guide roller and rubber roller arrangement;
FIG. 3 is a top view of a smooth guide roller and rubber roller arrangement;
in the figure, 1-the first smooth guide roll; 2-a second smooth guide roller; 3, feeding a rubber roller; 4-lower rubber roller; d1 — first smooth guide roller minimum cross-sectional diameter; d2-second smooth guide roller minimum cross-sectional diameter; d3-upper rubber roll diameter; d4-lower rubber roll diameter; l1 — first smooth guide roller length; l2 — second smooth guide roller length; l3-upper rubber roller length; l4-lower rubber roll length; h 1-the height of the center protrusion of the first smooth guide roller; h 2-second smooth guide roller center protrusion height.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The invention provides a rapid manufacturing method of polytetrafluoroethylene fibers, which comprises the following steps:
step one, adopting polytetrafluoroethylene dispersion resin powder with the number average molecular weight of more than 1000 ten thousand as a raw material, adopting aviation kerosene as an extrusion-assisting oil agent, uniformly mixing the polytetrafluoroethylene dispersion resin powder and the aviation kerosene according to the mass ratio of 10:2 to obtain a paste, and standing the paste in an environment with the temperature of 50 ℃ for 30 hours;
step two, pouring the paste left standing in the step one 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 200 microns;
and step three, evaporating the aviation kerosene of the calendered film in the step two through a box body with the temperature of 230 ℃, and then performing hot drawing through the box body with the temperature of 400 ℃ to obtain a sintered film. Wherein the input speed of the hot drawing is 5m/min, and the output speed is 60 m/min;
and step four, inputting the sintered film in the step three into a pair of smooth guide rollers with convex surfaces, conveying the sintered film to a film cracking roller and a carding roller through a pair of rubber rollers, and finally winding to prepare the polytetrafluoroethylene fiber bundle. Wherein the minimum section diameter D1 of the first smooth guide roller is 10mm, the length L1 is 200mm, and the maximum height h1 of the central bulge is 40 mm; the minimum section diameter D2 of the second smooth guide roller is 10mm, the length L2 is 200mm and is the same as the length of the first smooth guide roller, and the maximum height h2 of the central bulge is 10 mm; the horizontal spacing between the centers of the first smooth guide roller and the second smooth guide roller is 150mm, and the vertical spacing is 150 mm. The upper rubber roller of the pair of rubber rollers has a length L3 of 200mm and a diameter D3 of 60mm, and the lower rubber roller has a length L4 of 200mm and a diameter D4 of 60 mm; the centers of the upper rubber roller and the lower rubber roller are on a vertical line, and the vertical distance between the upper rubber roller and the lower rubber roller is 60 mm. The input speed of the sintering film is 60m/min, and the winding speed of the polytetrafluoroethylene fiber bundle is 60 m/min.
Example 2
The invention provides a rapid manufacturing method of polytetrafluoroethylene fibers, which comprises the following steps:
step one, adopting polytetrafluoroethylene dispersion resin powder with the number average molecular weight of more than 1000 ten thousand as a raw material, adopting aviation kerosene as an extrusion-assisting oil agent, uniformly mixing the polytetrafluoroethylene dispersion resin powder and the aviation kerosene according to the mass ratio of 10:1 to obtain a paste, and standing the paste in an environment with the temperature of 45 ℃ for 25 hours;
step two, pouring the paste left standing in the step one 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 150 microns;
and step three, evaporating the aviation kerosene of the calendered film in the step two through a box body with the temperature of 220 ℃, and then performing hot drawing through the box body with the temperature of 380 ℃ to obtain a sintered film. Wherein the input speed of the hot drawing is 4m/min, and the output speed is 70 m/min;
and step four, inputting the sintered film in the step three into a pair of smooth guide rollers with convex surfaces, conveying the sintered film to a film cracking roller and a carding roller through a pair of rubber rollers, and finally winding to prepare the polytetrafluoroethylene fiber bundle. Wherein the minimum section diameter D1 of the first smooth guide roller is 10mm, the length L1 is 200mm, and the maximum height h1 of the central bulge is 40 mm; the minimum section diameter D2 of the second smooth guide roller is 10mm, the length L2 is 200mm and is the same as the length of the first smooth guide roller, and the maximum height h2 of the central bulge is 10 mm; the horizontal spacing distance between the centers of the first smooth guide roller and the second smooth guide roller is 100mm, and the vertical spacing distance is 100 mm. The upper rubber roller of the pair of rubber rollers has a length L3 of 200mm and a diameter D3 of 60mm, and the lower rubber roller has a length L4 of 200mm and a diameter D4 of 60 mm; the centers of the upper rubber roller and the lower rubber roller are on a vertical line, and the vertical distance between the upper rubber roller and the lower rubber roller is 60 mm. The input speed of the sintering film is 60m/min, and the winding speed of the polytetrafluoroethylene fiber bundle is 60 m/min.
Example 3
The invention provides a rapid manufacturing method of polytetrafluoroethylene fibers, which comprises the following steps:
step one, adopting polytetrafluoroethylene dispersion resin powder with the number average molecular weight of more than 1000 ten thousand as a raw material, adopting aviation kerosene as an extrusion-assisting oil agent, uniformly mixing the polytetrafluoroethylene dispersion resin powder and the aviation kerosene according to the mass ratio of 10:3 to obtain a paste, and standing the paste in an environment with the temperature of 60 ℃ for 40 hours;
step two, pouring the paste left standing in the step one 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;
and step three, evaporating the aviation kerosene of the calendered film in the step two through a box body with the temperature of 250 ℃, and performing hot drawing through the box body with the temperature of 420 ℃ to obtain a sintered film. Wherein the input speed of the hot drawing is 6m/min, and the output speed is 80 m/min;
and step four, inputting the sintered film in the step three into a pair of smooth guide rollers with convex surfaces, conveying the sintered film to a film cracking roller and a carding roller through a pair of rubber rollers, and finally winding to prepare the polytetrafluoroethylene fiber bundle. Wherein the minimum section diameter D1 of the first smooth guide roller is 10mm, the length L1 is 300mm, and the maximum height h1 of the central bulge is 80 mm; the minimum section diameter D2 of the second smooth guide roller is 10mm, the length L2 is 300mm and is the same as the length of the first smooth guide roller, and the maximum height h2 of the central bulge is 20 mm; the horizontal spacing between the centers of the first smooth guide roller and the second smooth guide roller is 300mm, and the vertical spacing is 300 mm. The upper rubber roller of the pair of rubber rollers has a length L3 of 300mm and a diameter D3 of 80mm, and the lower rubber roller has a length L4 of 300mm and a diameter D4 of 80 mm; the centers of the upper rubber roller and the lower rubber roller are on a vertical line, and the vertical distance between the upper rubber roller and the lower rubber roller is 80 mm. The input speed of the sintering film is 80m/min, and the winding speed of the polytetrafluoroethylene fiber bundle is 80 m/min.
Referring to fig. 1-3, which are a front view, a left view and a top view of a pair of smooth guide rollers and a pair of rubber rollers respectively, the configuration of the convex smooth guide rollers and the rubber rollers of the invention can avoid the folding phenomenon in the process of transferring the sintered film and improve the continuity of the production of the polytetrafluoroethylene fiber, and the method can be suitable for the high-speed production of the polytetrafluoroethylene, can improve the production speed from 30-40 m/min to 60-80 m/min, and greatly improves the production efficiency.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes in the embodiments and/or modifications of the invention can be made, and equivalents and modifications of some features of the invention can be made without departing from the spirit and scope of the invention.
Claims (7)
1. A rapid manufacturing method of polytetrafluoroethylene fibers is characterized in that: mixing polytetrafluoroethylene dispersion powder and extrusion aid oil to prepare paste, and standing for a period of time; then pouring the paste after standing into a preforming device to be pressurized to prepare a preforming body, and then carrying out extrusion forming, calendaring, oil removing, hot drawing, film cracking, carding and winding to prepare polytetrafluoroethylene fibers; the method comprises the following specific steps:
step S1, adopting polytetrafluoroethylene dispersion powder as a raw material and aviation kerosene as an extrusion assisting oil agent, uniformly mixing the polytetrafluoroethylene dispersion powder and the aviation kerosene according to a certain mass ratio to obtain a paste material, and standing the paste material for a period of time;
step S2, pouring the paste left standing in the step S1 into a preforming device, pressurizing to prepare a preforming body, and then carrying out extrusion forming and calendering to obtain a calendered film;
step S3, evaporating the aviation kerosene of the calendered film in the step 2 through a box body with the temperature of 220-250 ℃, and then performing hot drawing through the box body with the temperature of 380-420 ℃ to obtain a sintered film;
s4, inputting the sintered film in the S3 into a pair of smooth guide rollers, conveying the sintered film to a film cracking roller and a carding roller through a pair of rubber rollers, and finally winding to prepare a polytetrafluoroethylene fiber bundle;
the pair of smooth guide rollers in the step S4 are a pair of smooth guide rollers with convex surfaces, specifically a first smooth guide roller (1) and a second smooth guide roller (2); the pair of rubber rollers in the step S4 is specifically an upper rubber roller (3) and a lower rubber roller (4);
an interval exists between the center lines of the first smooth guide roller and the second smooth guide roller; the centers of the upper rubber roller and the lower rubber roller are on a vertical line, and the vertical distance between the upper rubber roller and the lower rubber roller is the same as the diameter of the rubber rollers;
the horizontal spacing between the centers of the first smooth guide roller and the second smooth guide roller is 100-300 mm, and the vertical spacing is 100-300 mm.
2. A method for rapid manufacturing of polytetrafluoroethylene fibers according to claim 1, wherein: the molecular weight of the polytetrafluoroethylene dispersion powder is >1000 ten thousand.
3. A method for rapid manufacturing of polytetrafluoroethylene fibers according to claim 1, wherein: the mass ratio of the polytetrafluoroethylene dispersed powder to the aviation kerosene in the step S1 is 10:1 to 3.
4. A method for rapid manufacturing of polytetrafluoroethylene fibers according to claim 1, wherein: the temperature condition of the paste standing in the step S1 is 45-60 ℃, and the standing time is 25-40 hours.
5. A method for rapid manufacturing of polytetrafluoroethylene fibers according to claim 1, wherein: the thickness of the rolled film obtained in the step S2 is 150 to 250 μm.
6. A method for rapid manufacturing of polytetrafluoroethylene fibers according to claim 1, wherein: in the step S3, the input speed of the hot drawing is 4-6 m/min, and the output speed is 60-80 m/min.
7. A method for rapid manufacturing of polytetrafluoroethylene fibers according to claim 1, wherein: the minimum section diameter (D1) of the first smooth guide roller is 10mm, the length (L1) of the first smooth guide roller is 200-300 mm, the maximum height (h1) of the central bulge of the first smooth guide roller is 40-80mm, the minimum section diameter (D2) and the length (L2) of the second smooth guide roller are consistent with those of the first smooth guide roller, and the maximum height (h2) of the central bulge of the second smooth guide roller is 10-20 mm; the length (L3) of the upper rubber roller is 200-300 mm, the diameter (D3) of the upper rubber roller is 60-80 mm, and the length (L4) and the diameter (D4) of the lower rubber roller are consistent with those of the upper rubber roller.
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| CN114908431B (en) * | 2022-06-24 | 2023-05-09 | 灵氟隆新材料科技江苏有限公司 | Preparation method of polytetrafluoroethylene extruded filaments with high mass density uniformity |
| CN115110168B (en) * | 2022-06-24 | 2024-04-12 | 苏州大学 | Manufacturing method of polytetrafluoroethylene fiber with high quality density uniformity |
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| CN103448251B (en) * | 2013-09-17 | 2015-09-02 | 浙江格尔泰斯环保特材科技有限公司 | For the preparation of the polytetrafluoroethylfiber fiber film of superfine fibre |
| CN107475795A (en) * | 2017-08-03 | 2017-12-15 | 安徽元琛环保科技股份有限公司 | A kind of denitration polytetrafluoroethylene fibre and preparation method thereof |
| CN207190254U (en) * | 2017-09-12 | 2018-04-06 | 浙江绿净环保科技有限公司 | A kind of polytetrafluoroethylene (PTFE) base band stretching-machine |
| CN209906002U (en) * | 2019-04-04 | 2020-01-07 | 江苏华强印染机械有限公司 | Be fit for PTFE membrane coiling mechanism |
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