CN110975638A - Polytetrafluoroethylene hollow fiber membrane biaxial stretching device and method for preparing polytetrafluoroethylene hollow fiber membrane by using same - Google Patents
Polytetrafluoroethylene hollow fiber membrane biaxial stretching device and method for preparing polytetrafluoroethylene hollow fiber membrane by using same Download PDFInfo
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- CN110975638A CN110975638A CN201911393697.2A CN201911393697A CN110975638A CN 110975638 A CN110975638 A CN 110975638A CN 201911393697 A CN201911393697 A CN 201911393697A CN 110975638 A CN110975638 A CN 110975638A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
- B01D71/06—Organic material
- B01D71/30—Polyalkenyl halides
- B01D71/32—Polyalkenyl halides containing fluorine atoms
- B01D71/36—Polytetrafluoroethene
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D67/00—Processes specially adapted for manufacturing semi-permeable membranes for separation processes or apparatus
- B01D67/0002—Organic membrane manufacture
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
- B01D69/08—Hollow fibre membranes
Abstract
A polytetrafluoroethylene hollow fiber membrane biaxial stretching device comprises a drying box, an expansion box and a stretching box which are sequentially arranged from back to front; the drying box and the expansion box are fixedly connected together, and the expansion box and the stretching box are fixedly connected together; the drying box is a closed space, and a plurality of traction rollers are arranged in the drying box; an expansion die, a lower traction roller and an upper traction roller are arranged in the expansion tank; the lower traction roller is arranged and fixed below the upper traction roller and is positioned at the front side of the expansion die; a lower stretching roller and an upper stretching roller are arranged in the stretching box; the lower stretching roller is installed and fixed below the upper stretching roller. The invention can effectively control the degreasing efficiency and the aperture and porosity of the hollow fiber membrane in the stretching process, and avoid the rupture and collapse of the hollow fiber in the stretching process.
Description
Technical Field
The invention relates to a hollow fiber membrane biaxial stretching device and a method for preparing a polytetrafluoroethylene hollow fiber membrane by using the same.
Background
The hollow fiber membrane is a common membrane component, has the characteristics of self-support, easiness in cleaning, high loading density, small occupied area and the like, and is widely applied to the field of membrane separation such as reverse osmosis, ultrafiltration, microfiltration, membrane contactors, membrane reactors and the like. Common hollow fiber membrane materials include polyvinyl chloride, polypropylene, polyethylene, polyacrylonitrile, polyvinylidene fluoride, polytetrafluoroethylene, and the like. Different membrane materials have different preparation methods, such as wet spinning or dry-wet spinning, and a solvent-nonsolvent or thermal phase conversion mechanism is adopted to obtain the hollow fiber membrane, and most of the current hollow fiber membranes adopt the method. Or melt spinning and a stretching pore-forming method are adopted, such as the preparation of hollow fiber membranes made of polypropylene, polyethylene, polyvinylidene fluoride and the like.
Different application occasions put forward different use requirements on the hollow fiber membrane, including requirements on membrane pore size, porosity, membrane structure, membrane flux, membrane strength, corrosion resistance, oxidation resistance, microorganism resistance, solvent resistance and the like. The polytetrafluoroethylene has excellent characteristics of strong acid and alkali resistance, oxidation resistance, microbial corrosion resistance, high and low temperature resistance and the like, and the hollow fiber membrane based on the polytetrafluoroethylene base material has the characteristics of high strength and large flux besides the excellent characteristics of the polytetrafluoroethylene, and has important application value in the fields of special filtration, membrane contactors, membrane reactors and the like.
The polytetrafluoroethylene hollow fiber membrane is generally prepared by using a dispersion type polymer polytetrafluoroethylene resin, performing paste extrusion under the action of a lubricant to obtain polytetrafluoroethylene fibers, removing the lubricant (degreasing), and then stretching and sintering to obtain the polytetrafluoroethylene hollow fiber membrane with micropores on the hollow fiber wall. The stretching step is a key link for realizing micropore generation, micropore size control and hollow fiber membrane structure control, and reports and patents in the aspect are few. The U.S. Pat. No. 4,9750318 discloses a polytetrafluoroethylene hollow fiber membrane stretching device, which realizes the stretching of polytetrafluoroethylene by adopting a manner similar to a seamless metal tube stretching device and adopting a circular hole die and a core rod. The device realizes the extrusion of the polytetrafluoroethylene hollow fiber wall through the matching of the core rod and the circular hole die. However, because the mode of freely moving the core rod is adopted, for the hollow fiber with smaller inner diameter, the diameter of the core rod is very small, the core rod is very difficult to be effectively controlled in the stretching process, meanwhile, the processing of the core rod is very difficult, and the stretching operation is very inconvenient. U.S. Pat. No. 4,4496507 shows an adopt fluting hot-rolling stretching device, adopts heating roller stretching device in the device, adopts heating roller to carry out temperature control in the device, and the easy hollow fiber that appears breaks, sinks scheduling problem in the stretching process. Meanwhile, the above two patents are both uniaxial tension preparation processes.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the polytetrafluoroethylene hollow fiber membrane biaxial stretching equipment and the preparation method thereof can effectively control degreasing efficiency and the aperture and porosity of the hollow fiber membrane in the stretching process, and avoid the rupture and the collapse of the hollow fiber in the stretching process.
In order to solve the technical problems, the invention provides the following technical scheme: a polytetrafluoroethylene hollow fiber membrane biaxial stretching device comprises a drying box, an expansion box and a stretching box which are sequentially arranged from back to front;
the drying box and the expansion box are fixedly connected together, and the expansion box and the stretching box are fixedly connected together; the drying box is a closed space, and a plurality of traction rollers are arranged in the drying box;
an expansion die, a lower traction roller and an upper traction roller are arranged in the expansion tank;
the lower traction roller is arranged and fixed below the upper traction roller and is positioned at the front side of the expansion die;
a lower stretching roller and an upper stretching roller are arranged in the stretching box;
the lower stretching roller is installed and fixed below the upper stretching roller.
The technical scheme is further limited in that the drying box, the expansion box and the stretching box are separated by non-heat-insulation metal plates.
The technical scheme is further limited in that a groove is formed in the surface of each traction roller, grooves are formed in the surfaces of the lower traction roller and the upper traction roller, and grooves are formed in the surfaces of the lower stretching roller and the upper stretching roller.
The above solution is further limited in that the diameter of the lower pulling roll is larger than the diameter of the upper pulling roll.
The further limitation of the above technical solution is that the diameter ratio of the lower pulling roll and the upper pulling roll is 6: 1.
the above solution is further limited in that the diameter of the lower stretching roll is smaller than the diameter of the upper stretching roll.
The above technical solution is further limited in that the diameter ratio of the lower stretching roll and the upper stretching roll is 1: 6.
in order to solve the technical problems, the invention provides the following technical scheme: a method for preparing a polytetrafluoroethylene hollow fiber membrane by using the bidirectional stretching equipment for the polytetrafluoroethylene hollow fiber membrane is characterized by comprising the following steps: extruding a hollow fiber membrane tube blank by a pushing and pressing machine, then feeding the extruded hollow fiber membrane tube blank into a drying box, winding the hollow fiber membrane tube blank on a plurality of traction rollers in the drying box for degreasing and heating, drawing the degreased hollow fiber membrane tube blank by a lower traction roller and an upper traction roller, then passing the degreased hollow fiber membrane tube blank through an expansion die, transversely stretching the degreased hollow fiber membrane tube blank in the expansion die, and then feeding the hollow fiber membrane tube blank between a lower stretching roller and an upper stretching roller for longitudinally stretching.
The technical scheme is further limited in that the surface linear speed of the lower stretching roller and the upper stretching roller in the stretching box is greater than that of the lower traction roller and the upper traction roller in the expansion box, and the ratio of the surface linear speed to the surface linear speed of the lower traction roller to the surface linear speed of the upper traction roller is 15: 1.
The technical scheme is further limited in that the central connecting line of the lower traction roller and the upper traction roller is vertical to the hollow fiber membrane tube blank.
Compared with the prior art, the invention has the following beneficial effects:
1. degreasing, expansion and stretching are carried out in the integral oven, so that heat energy in the stretching box 3 is effectively utilized, the space is saved, and the energy is saved;
2. the control of the aperture and the porosity of the hollow fiber membrane can be effectively realized by adopting bidirectional stretching and step-by-step stretching;
3. the defects of tube blank fracture, collapse and the like in the stretching process of the polytetrafluoroethylene hollow fiber membrane are effectively avoided, and the processing quality is improved.
4. Due to the fact that the bidirectional stretching is achieved, the polytetrafluoroethylene hollow fiber membrane with small pore size and high porosity can be simply and efficiently obtained.
Drawings
FIG. 1 is a schematic view of the general structure of a biaxial stretching apparatus for a polytetrafluoroethylene hollow fiber membrane according to the invention.
Detailed Description
Referring to fig. 1, a bidirectional stretching apparatus for polytetrafluoroethylene hollow fiber membranes includes a drying box 1, an expansion box 2, and a stretching box 3, which are sequentially installed from back to front.
The drying box 1 and the expansion box 2 are fixedly connected together, and the expansion box 2 and the stretching box 3 are fixedly connected together. The drying box 1, the expansion box 2 and the stretching box 3 are separated by non-heat-insulating metal plates.
The hollow fiber membrane tube blank 1000 to be stretched enters from the drying box 1, passes through the expansion box 2 and the stretching box 3, and finally exits from the stretching box 3.
The drying box 1 is a closed space, a plurality of traction rollers 11 are arranged in the drying box 1, and a groove (not shown) for accommodating the hollow fiber membrane tube blank 1000 is formed in the surface of each traction roller 11.
An expansion die 21, a lower drawing roll 23 and an upper drawing roll 25 are arranged in the expansion tank 2.
The surfaces of the lower pulling roll 23 and the upper pulling roll 25 are both provided with grooves (not shown) for accommodating the hollow fiber membrane tube blanks 1000.
The lower drawing rolls 23 are mounted and fixed below the upper drawing rolls 25 and are located all at the front side of the expansion die 21.
The lower pulling roll 23 and the upper pulling roll 25 cooperate to sandwich the hollow fiber membrane tube blank 1000 therebetween.
The lower pulling roll 23 has a larger diameter than the upper pulling roll 25. The diameter ratio of the lower pulling roll 23 and the upper pulling roll 25 is 6: 1.
a lower stretching roller 31 and an upper stretching roller 33 are provided in the stretching box 3.
The surfaces of the lower stretching roll 31 and the upper stretching roll 33 are both provided with grooves (not shown) for accommodating the hollow fiber membrane blank 1000.
The lower stretching roller 31 is fixed below the upper stretching roller 33, and the two rollers cooperate to sandwich the hollow fiber membrane tube blank 1000 therebetween.
The lower stretching roller 31 has a smaller diameter than the upper stretching roller 33. The diameter ratio of the lower stretching roller 31 and the upper stretching roller 33 is 1: 6.
the traction roller 11, the lower traction roller 23, the upper traction roller 25, the lower stretching roller 31 and the upper stretching roller 33 are driven by a motor to rotate, and the expansion die 21 is connected with a vacuum pump through a pipeline and provided with expansion force action by the vacuum pump.
The method for preparing the polytetrafluoroethylene hollow fiber membrane by applying the equipment comprises the following steps: extruding a hollow fiber membrane tube blank 1000 by a pushing and pressing machine, then feeding the extruded hollow fiber membrane tube blank into a drying box 1, winding the hollow fiber membrane tube blank 1000 on a plurality of traction rollers 11 in the drying box 1 for degreasing and heating, drawing the degreased hollow fiber membrane tube blank 1000 by a lower traction roller 23 and an upper traction roller 25, then passing the degreased hollow fiber membrane tube blank through an expansion die 21, transversely stretching the degreased hollow fiber membrane tube blank in the expansion die 21, and then feeding the hollow fiber membrane tube blank 1000 between a lower stretching roller 31 and an upper stretching roller 33 for longitudinal stretching.
The surface linear velocity of the lower stretching roller 31 and the upper stretching roller 33 in the stretching box 3 is larger than that of the lower traction roller 23 and the upper traction roller 25 in the expansion box 2, and the ratio of the surface linear velocity to the surface linear velocity is 15: 1.
The center connecting line of the lower drawing roll 23 and the upper drawing roll 25 is perpendicular to the hollow fiber membrane tube blank 1000.
Claims (10)
1. A polytetrafluoroethylene hollow fiber membrane biaxial stretching device is characterized by comprising a drying box, an expansion box and a stretching box which are sequentially arranged from back to front;
the drying box and the expansion box are fixedly connected together, and the expansion box and the stretching box are fixedly connected together; the drying box is a closed space, and a plurality of traction rollers are arranged in the drying box;
an expansion die, a lower traction roller and an upper traction roller are arranged in the expansion tank;
the lower traction roller is arranged and fixed below the upper traction roller and is positioned at the front side of the expansion die;
a lower stretching roller and an upper stretching roller are arranged in the stretching box;
the lower stretching roller is installed and fixed below the upper stretching roller.
2. The biaxially oriented apparatus according to claim 1, wherein the drying box, the expansion box and the stretching box are separated by a non-heat insulating metal plate.
3. The apparatus of claim 1, wherein each of the drawing rolls has a groove formed on a surface thereof, the lower drawing roll and the upper drawing roll have grooves formed on surfaces thereof, and the lower drawing roll and the upper drawing roll have grooves formed on surfaces thereof.
4. The apparatus of claim 1, wherein the lower drawing roll has a diameter larger than that of the upper drawing roll.
5. The apparatus of claim 4, wherein the ratio of the diameter of the lower pulling roll to the diameter of the upper pulling roll is 6: 1.
6. a polytetrafluoroethylene hollow fiber membrane biaxial stretching device according to claim 1, wherein the diameter of the lower stretching roll is smaller than that of the upper stretching roll.
7. The apparatus of claim 6, wherein the ratio of the diameter of the lower stretching roll to the diameter of the upper stretching roll is 1: 6.
8. a method for producing a polytetrafluoroethylene hollow fiber membrane using the apparatus for biaxial stretching of polytetrafluoroethylene hollow fiber membrane according to any one of claims 1 to 7, characterized in that: extruding a hollow fiber membrane tube blank by a pushing and pressing machine, then feeding the extruded hollow fiber membrane tube blank into a drying box, winding the hollow fiber membrane tube blank on a plurality of traction rollers in the drying box for degreasing and heating, drawing the degreased hollow fiber membrane tube blank by a lower traction roller and an upper traction roller, then passing the degreased hollow fiber membrane tube blank through an expansion die, transversely stretching the degreased hollow fiber membrane tube blank in the expansion die, and then feeding the hollow fiber membrane tube blank between a lower stretching roller and an upper stretching roller for longitudinally stretching.
9. A method for producing a polytetrafluoroethylene hollow fiber membrane according to claim 8, wherein: the surface linear velocity of the lower stretching roller and the upper stretching roller in the stretching box is greater than that of the lower traction roller and the upper traction roller in the expansion box, and the ratio of the surface linear velocity to the surface linear velocity of the lower traction roller to the surface linear velocity of the upper traction roller is 15: 1.
10. A method for producing a polytetrafluoroethylene hollow fiber membrane according to claim 8, wherein: the central connecting line of the lower traction roller and the upper traction roller is vertical to the hollow fiber membrane tube blank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911393697.2A CN110975638A (en) | 2019-12-30 | 2019-12-30 | Polytetrafluoroethylene hollow fiber membrane biaxial stretching device and method for preparing polytetrafluoroethylene hollow fiber membrane by using same |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911393697.2A CN110975638A (en) | 2019-12-30 | 2019-12-30 | Polytetrafluoroethylene hollow fiber membrane biaxial stretching device and method for preparing polytetrafluoroethylene hollow fiber membrane by using same |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114214846A (en) * | 2021-12-01 | 2022-03-22 | 泉州迈特富纺织科技有限公司 | Camouflage shielding flame-retardant cloth and production method thereof |
| CN117140933A (en) * | 2023-10-27 | 2023-12-01 | 江苏美能膜材料科技有限公司 | Processing equipment for hollow fiber membrane production |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101961609A (en) * | 2010-10-15 | 2011-02-02 | 浙江理工大学 | Polytetrafluoroethylene hollow fiber stretching device |
| CN104190268A (en) * | 2014-09-01 | 2014-12-10 | 浙江理工大学 | Bidirectional drawing device and bidirectional drawing method for hollow polytetrafluoroethylene fiber membrane |
-
2019
- 2019-12-30 CN CN201911393697.2A patent/CN110975638A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101961609A (en) * | 2010-10-15 | 2011-02-02 | 浙江理工大学 | Polytetrafluoroethylene hollow fiber stretching device |
| CN104190268A (en) * | 2014-09-01 | 2014-12-10 | 浙江理工大学 | Bidirectional drawing device and bidirectional drawing method for hollow polytetrafluoroethylene fiber membrane |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114214846A (en) * | 2021-12-01 | 2022-03-22 | 泉州迈特富纺织科技有限公司 | Camouflage shielding flame-retardant cloth and production method thereof |
| CN114214846B (en) * | 2021-12-01 | 2023-11-28 | 福建迈特富科技发展有限公司 | Camouflage shielding flame-retardant cloth and production method thereof |
| CN117140933A (en) * | 2023-10-27 | 2023-12-01 | 江苏美能膜材料科技有限公司 | Processing equipment for hollow fiber membrane production |
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