CN111016207A - Flexible and low-density PTFE (Polytetrafluoroethylene) stretched pipe as well as manufacturing process and application thereof - Google Patents
Flexible and low-density PTFE (Polytetrafluoroethylene) stretched pipe as well as manufacturing process and application thereof Download PDFInfo
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- CN111016207A CN111016207A CN201911319758.0A CN201911319758A CN111016207A CN 111016207 A CN111016207 A CN 111016207A CN 201911319758 A CN201911319758 A CN 201911319758A CN 111016207 A CN111016207 A CN 111016207A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C69/00—Combinations of shaping techniques not provided for in a single one of main groups B29C39/00 - B29C67/00, e.g. associations of moulding and joining techniques; Apparatus therefore
- B29C69/02—Combinations of shaping techniques not provided for in a single one of main groups B29C39/00 - B29C67/00, e.g. associations of moulding and joining techniques; Apparatus therefore of moulding techniques only
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2027/00—Use of polyvinylhalogenides or derivatives thereof as moulding material
- B29K2027/12—Use of polyvinylhalogenides or derivatives thereof as moulding material containing fluorine
- B29K2027/18—PTFE, i.e. polytetrafluorethene, e.g. ePTFE, i.e. expanded polytetrafluorethene
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2023/00—Tubular articles
- B29L2023/22—Tubes or pipes, i.e. rigid
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
Abstract
The invention relates to a flexible and low-density PTFE stretched pipe and a manufacturing process and application thereof. The manufacturing process comprises the steps of sieving, oil mixing, curing, preforming, extruding, drying, stretching and heat setting, and the density of the prepared PTFE stretched pipe is 0.4-1.0g/cm3The melting point is 320-330 ℃, the outer diameter is 2.0-5.0mm, the wall thickness is 0.3-3.0mm, the bending radius is 1.5-3mm, and the tensile strength is 10-30 MPa. The PTFE stretched tube prepared by the manufacturing process has the advantages of controllable density, high strength, small bending radius and excellent uniformity, can be used for endoscope tubes, chemical tubes, water treatment tubes and the like in the medical field, and has the advantages of simple manufacturing process, good stability, good repeatability, easy operation and strong practicability.
Description
Technical Field
The invention relates to a soft and low-density PTFE (polytetrafluoroethylene) stretched tube and a manufacturing process and application thereof, belonging to the technical field of processing and manufacturing of PTFE tubes.
Background
The endoscope is a common medical apparatus and instrument, which is composed of three systems, namely an endoscope system, an image display system and an illumination system, enters the human body through a natural pore canal of the human body or a small incision made by an operation, and when the endoscope is used, the endoscope is guided into a pre-checked organ, so that the change of the relevant part can be directly observed, and the endoscope is one of important tools for observing and treating the organs in the human body by human beings. With the development of science and technology, endoscopes have undergone 4 major changes in the development process of over 200 years, from the initial rigid tube type endoscope, semi-curved endoscope to fiber endoscope, and to the electronic endoscope nowadays, the endoscopes have been widely applied in the medical field, and the endoscopes are developing towards miniaturization, multifunction, high comfort and high image quality. In recent years, Polytetrafluoroethylene (PTFE) tubes have been used in endoscopes because of their good biocompatibility, non-adhesiveness, chemical stability, electrical insulation, etc., but because PTFE tubes have a high hardness and lack of flexibility, if the bending radius of the tube in vivo is small, the tube may crack, which may damage the endoscope, which may cause great pain to the patient and may also directly affect the observation effect of the endoscope.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the soft and low-density PTFE stretched tube and the manufacturing process and application thereof.
The technical scheme of the invention is as follows:
a process for the manufacture of a flexible and low density stretched PTFE tube comprising the steps of:
(1) sieving PTFE dispersion resin, mixing oil, curing, preforming, extruding and drying to obtain a PTFE extruded tube;
(2) stretching the PTFE extrusion pipe in the step (1) at the stretching temperature of 100 ℃ and 320 ℃ and at the stretching ratio of 1.5-8.0 times;
(3) and (3) performing heat setting on the PTFE extruded pipe stretched in the step (2), wherein the heat setting temperature is 340-.
In the present invention, the PTFE dispersion resin in step (1) is commercially available or prepared according to the prior art.
According to the present invention, it is preferable that the PTFE dispersion resin of step (1) is a copolymerized PTFE dispersion resin.
Preferably according to the invention, the screened mesh in step (1) is 5-14 mesh; further preferably 8 to 10 mesh.
Preferably according to the present invention, the stretching temperature in step (2) is 150-; further preferably, the stretching temperature is 210-.
Preferably according to the invention, the stretching ratio in step (2) is 2.5 to 8.0 times; more preferably, the stretching ratio is 2.5 to 6.0 times.
Preferably, the heat setting temperature in the step (3) is 375-420 ℃; further preferably, the heat setting temperature is 380-410 ℃.
Preferably, according to the invention, the time in step (3) is 1.0 to 5.0 min.
The PTFE stretched pipe prepared according to the manufacturing process has the density of 0.4-1.0g/cm3The melting point is 320-330 ℃, the outer diameter is 2.0-5.0mm, the wall thickness is 0.3-3.0mm, the bending radius is 1.5-3mm, and the tensile strength is 10-30 MPa.
Use of the above stretched PTFE tube as an endoscope tube, a chemical tube or a water treatment tube.
The experimental procedures not described in detail in the present invention were carried out according to the routine procedures in the art.
The invention has the technical characteristics and beneficial effects that:
the invention provides a soft and low-density PTFE (polytetrafluoroethylene) stretched tube and a manufacturing process thereof, which solve the technical problems of higher hardness and lack of flexibility of the PTFE tube by controlling the stretching temperature and stretching multiple of a PTFE extruded tube and the heat setting temperature of the PTFE stretched tube.
Detailed Description
The present invention is further described with reference to the following specific examples, wherein the steps and methods used in the examples are intended to illustrate the technical solutions of the present invention, but not to limit the present invention. The starting materials used in the examples are, unless otherwise specified, commercially available products.
The raw materials DF-2041 and DF-2048 used in the examples were all copolymerized PTFE resins.
Example 1
A process for the manufacture of a flexible and low density stretched PTFE tube comprising the steps of:
1) oil mixing and curing: sieving PTFE dispersion resin DF-2041 by a sieve of 10 meshes, mixing with isoparaffin auxiliary agent isopar G according to the mass ratio of 84:16 on a mixing device at the speed of 20r/min for 35min, and then standing for 24h at the temperature of 35 ℃ for curing;
2) preforming: performing the cured PTFE dispersion resin at a speed of 25mm/min under a pressure of 3.0MPa for 20 min;
3) extruding and drying: moving the preformed blank to a pasty extruder, and performing constant-speed extrusion and drying at the speed of 5mm/min, wherein the cylinder temperature of the extruder is 60 ℃, the die temperature is 40 ℃, and the drying temperature is 200 ℃ to obtain a PTFE (polytetrafluoroethylene) extruded tube with the outer diameter of 5.0mm and the inner diameter of 2.4 mm;
4) stretching: stretching the PTFE extruded pipe dried in the step 3) at 220 ℃, wherein the stretching ratio is 2.5 times;
5) heat setting: and (3) performing heat setting on the stretched PTFE extruded tube in an oven at 380 ℃ for 2.0min to obtain the soft and low-density PTFE stretched tube.
Example 2
A process for the manufacture of a flexible and low density stretched PTFE tube comprising the steps of:
1) oil mixing and curing: sieving PTFE dispersion resin DF-2041 by a sieve of 10 meshes, mixing with isoparaffin auxiliary agent isopar G according to the mass ratio of 84:16 on a mixing device at the speed of 20r/min for 35min, and then standing for 24h at the temperature of 35 ℃ for curing;
2) preforming: performing the cured PTFE dispersion resin at a speed of 25mm/min under a pressure of 3.0MPa for 20 min;
3) extruding and drying: moving the preformed blank to a pasty extruder, and performing constant-speed extrusion and drying at the speed of 5mm/min, wherein the cylinder temperature of the extruder is 60 ℃, the die temperature is 40 ℃, and the drying temperature is 200 ℃ to obtain a PTFE (polytetrafluoroethylene) extruded tube with the outer diameter of 5.0mm and the inner diameter of 2.4 mm;
4) stretching: stretching the PTFE extruded tube dried in the step 3) at 260 ℃ with the stretching ratio of 6.0 times;
5) heat setting: and (3) performing heat setting on the stretched PTFE extruded tube in an oven at 380 ℃ for 2.0min to obtain the soft and low-density PTFE stretched tube.
Example 3
A process for the manufacture of a flexible and low density stretched PTFE tube comprising the steps of:
1) oil mixing and curing: sieving PTFE dispersion resin DF-2048 with a 10-mesh sieve, mixing with isoparaffin adjuvant G at a mass ratio of 82:18 on a mixing device at a speed of 20r/min for 35min, and standing at 35 deg.C for 24h for aging;
2) preforming: performing the cured PTFE dispersion resin at a speed of 25mm/min under a pressure of 3.0MPa for 20 min;
3) extruding and drying: moving the preformed blank to a pasty extruder, and performing constant-speed extrusion and drying at the speed of 5mm/min, wherein the cylinder temperature of the extruder is 60 ℃, the die temperature is 40 ℃, and the drying temperature is 200 ℃ to obtain a PTFE (polytetrafluoroethylene) extruded tube with the outer diameter of 4.0mm and the inner diameter of 2.0 mm;
4) stretching: stretching the PTFE extruded pipe dried in the step 3) at 280 ℃, wherein the stretching ratio is 3.5 times;
5) heat setting: and (3) performing heat setting on the stretched PTFE extruded tube in an oven at 390 ℃ for 1.5min to obtain the soft and low-density PTFE stretched tube.
Example 4
A process for the manufacture of a flexible and low density stretched PTFE tube comprising the steps of:
1) oil mixing and curing: sieving PTFE dispersion resin DF-2048 with a 10-mesh sieve, mixing with isoparaffin adjuvant G at a mass ratio of 81:19 on a mixing device at a speed of 20r/min for 35min, and standing at 35 deg.C for 24h for aging;
2) preforming: performing the cured PTFE dispersion resin at a speed of 25mm/min under a pressure of 3.0MPa for 20 min;
3) extruding and drying: moving the preformed blank to a pasty extruder, and performing constant-speed extrusion and drying at the speed of 5mm/min, wherein the cylinder temperature of the extruder is 60 ℃, the die temperature is 40 ℃, and the drying temperature is 200 ℃ to obtain a PTFE (polytetrafluoroethylene) extruded tube with the outer diameter of 3.0mm and the inner diameter of 2.0 mm;
4) stretching: stretching the PTFE extruded tube dried in the step 3) at 290 ℃, wherein the stretching ratio is 4.5 times;
5) heat setting: and (3) performing heat setting on the stretched PTFE extruded tube in an oven at 400 ℃ for 1.0min to obtain the soft and low-density PTFE stretched tube.
Comparative example 1
A process for the manufacture of stretched PTFE tube comprising the steps of:
1) oil mixing and curing: sieving PTFE dispersion resin DF-2041 by a sieve of 10 meshes, mixing with isoparaffin auxiliary agent isopar G according to the mass ratio of 84:16 on a mixing device at the speed of 20r/min for 35min, and then standing for 24h at the temperature of 35 ℃ for curing;
2) preforming: performing the cured PTFE dispersion resin at a speed of 25mm/min under a pressure of 3.0MPa for 20 min;
3) extruding and drying: moving the preformed blank to a pasty extruder, and performing constant-speed extrusion and drying at the speed of 5mm/min, wherein the cylinder temperature of the extruder is 60 ℃, the die temperature is 40 ℃, and the drying temperature is 200 ℃ to obtain a PTFE (polytetrafluoroethylene) extruded tube with the outer diameter of 5.0mm and the inner diameter of 2.4 mm;
4) stretching: stretching the PTFE extruded pipe dried in the step 3) at 220 ℃, wherein the stretching ratio is 1.5 times;
5) heat setting: and (3) carrying out heat setting on the stretched PTFE extruded tube in an oven at 300 ℃ for 30min to obtain the PTFE stretched tube.
Comparative example 2
A process for the manufacture of stretched PTFE tube comprising the steps of:
1) oil mixing and curing: sieving PTFE dispersion resin DF-2041 by a sieve of 10 meshes, mixing with isoparaffin auxiliary agent isopar G according to the mass ratio of 84:16 on a mixing device at the speed of 20r/min for 35min, and then standing for 24h at the temperature of 35 ℃ for curing;
2) preforming: performing the cured PTFE dispersion resin at a speed of 25mm/min under a pressure of 3.0MPa for 20 min;
3) extruding and drying: moving the preformed blank to a pasty extruder, and performing constant-speed extrusion and drying at the speed of 5mm/min, wherein the cylinder temperature of the extruder is 60 ℃, the die temperature is 40 ℃, and the drying temperature is 200 ℃ to obtain a PTFE (polytetrafluoroethylene) extruded tube with the outer diameter of 5.0mm and the inner diameter of 2.4 mm;
4) stretching: stretching the PTFE extruded tube dried in the step 3) at 50 ℃, wherein the stretching ratio is 2.5 times;
5) heat setting: and (3) carrying out heat setting on the stretched PTFE extruded tube in an oven at 380 ℃ for 2.0min to obtain the PTFE stretched tube.
Comparative example 3
A process for the manufacture of stretched PTFE tube comprising the steps of:
1) oil mixing and curing: sieving PTFE dispersion resin DF-2041 by a sieve of 10 meshes, mixing with isoparaffin auxiliary agent isopar G according to the mass ratio of 84:16 on a mixing device at the speed of 20r/min for 35min, and then standing for 24h at the temperature of 35 ℃ for curing;
2) preforming: performing the cured PTFE dispersion resin at a speed of 25mm/min under a pressure of 3.0MPa for 20 min;
3) extruding and drying: moving the preformed blank to a pasty extruder, and performing constant-speed extrusion and drying at the speed of 5mm/min, wherein the cylinder temperature of the extruder is 60 ℃, the die temperature is 40 ℃, and the drying temperature is 200 ℃ to obtain a PTFE (polytetrafluoroethylene) extruded tube with the outer diameter of 5.0mm and the inner diameter of 4.0 mm;
4) stretching: stretching the PTFE extruded pipe dried in the step 3) at 220 ℃, wherein the stretching magnification is 12.0 times;
5) heat setting: and (3) carrying out heat setting on the stretched PTFE extruded tube in an oven at 380 ℃ for 2.0min to obtain the PTFE stretched tube.
The characteristics of the PTFE stretched tubes obtained in examples 1 to 4 of the present invention and comparative examples 1 to 4 were examined, and the results are shown in Table 1.
TABLE 1 test data for PTFE stretched tubes of examples 1-4 and comparative examples 1-4
As can be seen from Table 1, the PTFE stretched tubes of examples 1 to 4 had a density of less than 1.0g/cm3The bending radius is less than 3mm, the melting point is between 320 ℃ and 330 ℃, and the tensile strength is between 10 and 30 MPa. The heat-setting temperature of comparative example 1 was low, resulting in a tube melting point of over 330 ℃, and because the tube was not sintered, the tube strength was low, and the bend radius was large; comparative example 2 the tube after drawing had a higher density and a larger bend radius because of the lower drawing temperature; in comparative example 3, since the draw ratio was relatively high, a severe fracture phenomenon occurred during drawing, and drawing was impossible.
The above examples are only for illustrating the present invention and are not intended to limit the scope of the present invention. It is to be understood that one or more method steps recited herein are not exclusive of other method steps being present before or after the recited combining step or intervening method steps between those explicitly recited, and further that these examples are intended only to illustrate the present invention and are not intended to limit the scope of the present invention. Moreover, unless otherwise indicated, the numbering of the various method steps is only a convenient tool for identifying the various method steps, and does not limit the order of the method steps or the scope of the invention, and changes or modifications in the relative relationship thereof may be considered as the scope of the invention without substantially changing the technical content.
Claims (10)
1. A process for the manufacture of a flexible and low density stretched PTFE tube, comprising the steps of:
(1) sieving PTFE dispersion resin, mixing oil, curing, preforming, extruding and drying to obtain a PTFE extruded tube;
(2) stretching the PTFE extrusion pipe in the step (1) at the stretching temperature of 100 ℃ and 320 ℃ and at the stretching ratio of 1.5-8.0 times;
(3) and (3) performing heat setting on the PTFE extruded pipe stretched in the step (2), wherein the heat setting temperature is 340-.
2. The process of claim 1, wherein the PTFE dispersion resin of step (1) is a copolymeric PTFE dispersion resin.
3. The manufacturing process according to claim 1, wherein the screened mesh in step (1) is 5-14 mesh.
4. The manufacturing process according to claim 1, wherein the stretching temperature in step (2) is 150-290 ℃.
5. The manufacturing process according to claim 1, wherein the stretching temperature in step (2) is 210-290 ℃.
6. The manufacturing process according to claim 1, wherein the stretching ratio in the step (2) is 2.5 to 8.0 times.
7. The manufacturing process as claimed in claim 1, wherein the temperature of the heat setting in step (3) is 375-420 ℃.
8. The manufacturing process according to claim 1, wherein the heat setting temperature in step (3) is 380-410 ℃.
9. Stretched PTFE tube produced by the production process according to claim 1, wherein the stretched PTFE tube has a density of 0.4 to 1.0g/cm3The melting point is 320-330 ℃, the outer diameter is 2.0-5.0mm, the wall thickness is 0.3-3.0mm, the bending radius is 1.5-3mm, and the tensile strength is 10-30 MPa.
10. Use of the stretched PTFE tube of claim 9 as an endoscope tube, a chemical tube, or a water treatment tube.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114377560A (en) * | 2021-12-09 | 2022-04-22 | 山东东岳高分子材料有限公司 | Polytetrafluoroethylene hollow fiber membrane and preparation method thereof |
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