CN115926222A - PTFE raw material tape and preparation method and application thereof - Google Patents
PTFE raw material tape and preparation method and application thereof Download PDFInfo
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- CN115926222A CN115926222A CN202211710081.5A CN202211710081A CN115926222A CN 115926222 A CN115926222 A CN 115926222A CN 202211710081 A CN202211710081 A CN 202211710081A CN 115926222 A CN115926222 A CN 115926222A
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- 239000004810 polytetrafluoroethylene Substances 0.000 title claims abstract description 100
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 58
- 239000000314 lubricant Substances 0.000 claims abstract description 49
- 229920005989 resin Polymers 0.000 claims abstract description 44
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- 239000001569 carbon dioxide Substances 0.000 claims abstract description 29
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- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical group FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 description 1
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Images
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
- Y02P20/54—Improvements relating to the production of bulk chemicals using solvents, e.g. supercritical solvents or ionic liquids
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- Manufacture Of Macromolecular Shaped Articles (AREA)
Abstract
The invention provides a PTFE raw material tape and a preparation method and application thereof. The preparation method of the PTFE raw material tape comprises the following steps: (1) Mixing PTFE dispersion resin and a lubricant to obtain a mixture; (2) And placing the mixture in a supercritical carbon dioxide reaction kettle, curing under a supercritical condition, and then molding to obtain the PTFE raw material tape. The PTFE raw material tape provided by the invention has the advantages of good density and thickness uniformity and good mechanical property, and can be used for preparing installation wires and data transmission wires of cables.
Description
Technical Field
The invention belongs to the technical field of raw material belt materials, and particularly relates to a PTFE raw material belt and a preparation method and application thereof.
Background
Polytetrafluoroethylene (PTFE) is a high-performance polymer material, has the outstanding characteristics of high insulativity, high and low temperature resistance, corrosion resistance and low loss, is one of the preferred insulating materials of special wires and cables, and is widely applied to the fields of high-frequency communication, medical instruments, military, aerospace and the like.
Since PTFE resin has the characteristics of large molecular weight, high melting point, and high crystallinity, the melt viscosity is very high even if it exceeds the melting point, and it cannot flow, so that paste extrusion molding is often used in the prior art to prepare PTFE green tapes.
CN109957195A discloses a preparation method of a dispersion PTFE resin special for raw material tapes. The preparation method comprises the following steps: deionized water is used as a medium, ammonium perfluoropolyether carboxylate is used as an emulsifier, liquid paraffin is used as a stabilizer, ammonium persulfate is used as an initiator, sodium bisulfite is used as a reducing agent, succinic acid is used as a pH regulator, tetrafluoroethylene is used as a polymerization monomer, the polymerization temperature is 50-60 ℃, the pressure is 1.6-3.0 MPa, the reducing agent is added in a dilute solution form with the mass percentage concentration of 1% at a constant speed within 90 minutes, constant pressure polymerization is carried out to obtain a mixed solution of PTFE emulsion and liquid paraffin, and the mixed solution of PTFE emulsion and liquid paraffin is used as a base material to prepare the modified raw material belt with special functionality.
CN114714717A discloses a preparation method of a polyimide composite film for a seamless lapped cable. The preparation method comprises the following steps: uniformly mixing PTFE powder and an auxiliary agent, curing, and pressing and extruding the cured raw material to form a rod-shaped blank; pressing the bar-shaped blank to a film belt; the film belt is sent into a degreasing furnace for degreasing, and a PTFE raw material belt is prepared; performing surface corona treatment on the PTFE raw material tape to enable the surface energy to reach 20-35mN/m; coating fluororesin emulsion on the surface of the PTFE raw material belt subjected to surface corona treatment by using a micro-concave coating machine, and curing to obtain a coating; and carrying out multi-layer hot-pressing compounding on the coated PTFE raw material tape and the PI film to obtain the polyimide composite film. The polyimide composite film disclosed by the invention has excellent electrical insulation performance, mechanical performance, stripping resistance and flexibility, and is suitable for insulation protection of wires and cables in aerospace and extreme environments.
As molecular chains of the PTFE dispersion resin are completely linear, the molecular chains in a crystal region are arranged loosely, phase transformation exists at 19 ℃ and 30 ℃, and the PTFE dispersion resin is easy to fibrillate when being sheared at the temperature of more than 19 ℃. These characteristics make PTFE dispersion resins amenable to production processing only by paste extrusion in a non-molten state. In the prior art, a non-shearing mixing process is generally adopted to prepare the PTFE raw material tape, and the specific method comprises the following steps: the PTFE dispersion resin and the lubricant are mixed by a shear-free mixer at a temperature of 19 ℃ or lower, and then aged at a temperature of 30 ℃ or higher for 8 hours or longer to sufficiently wet the surfaces of the PTFE resin particles with the lubricant. However, in the prior art, the PTFE dispersion resin mixing and curing process has the following defects: firstly, the uniform mixing between the lubricant and the resin particles is difficult to ensure without shearing the mixed material; secondly, the migration of the lubricant among the resin particles and the penetration of the lubricant into the resin are very limited in a non-pressure and non-shear state, so that the uniform distribution of the lubricant among the PTFE resin particles is difficult to ensure, and the resin particles cannot be completely wetted. In the subsequent forming process, the lubricant is easily extruded, so that the concentration difference of the lubricant in different areas is large, and finally the density and the thickness uniformity of the raw material belt are poor.
Therefore, how to provide a method for preparing a PTFE raw material tape with good density and thickness uniformity and good mechanical properties has become a technical problem to be solved at present.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a PTFE raw material belt and a preparation method and application thereof. According to the invention, by utilizing the supercritical technology and taking supercritical carbon dioxide as a transmission medium, the lubricant can better permeate and migrate among PTFE resin particles and can partially enter the swollen resin, so that the PTFE raw material tape with better density and thickness uniformity and better mechanical property is prepared.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the invention provides a preparation method of a PTFE raw material tape, which comprises the following steps:
(1) Mixing PTFE dispersion resin and a lubricant to obtain a mixture;
(2) And placing the mixture in a supercritical carbon dioxide reaction kettle, curing under a supercritical condition, and then molding to obtain the PTFE raw material tape.
The supercritical fluid has high diffusivity similar to gas and the dissolving capacity of liquid, and simultaneously has the characteristics of low viscosity and low surface tension, so that the supercritical fluid can quickly permeate into the micropore gaps, and the diffusion of substances dissolved in the supercritical fluid and the permeation of the substances to a solid matrix are facilitated. The supercritical carbon dioxide has the critical temperature of 31 ℃ and the pressure of 7.2MPa, is easy to realize, has no toxicity, no corrosiveness, safe operation and low price, and can be recycled.
According to the invention, supercritical carbon dioxide is used as a transmission medium, so that the dispersion and permeation effects of the lubricant in the PTFE dispersion resin can be improved, the lubricant can better permeate and migrate among PTFE resin particles, and part of the lubricant can enter the swollen resin. After the mixture of the PTFE resin and the lubricant is treated by supercritical carbon dioxide, the lubricant is more uniformly dispersed in the PTFE resin, and can well wet resin particles. Meanwhile, the supercritical carbon dioxide can swell the resin, so that part of the lubricant can permeate into the resin, therefore, in the subsequent forming process (blank pressing and pushing stage), the lubricant is not easy to migrate out of the resin under the action of pressure, the density of the prepared mixture is more uniform, the problem of blank breaking or cracking can be better avoided, the pushing production in the forming process is more stable, and the PTFE raw material belt with better density and thickness uniformity and better mechanical property can be prepared.
It should be noted that in the preparation method provided by the present invention, the curing is performed under the supercritical condition, the molding process is not performed under the supercritical condition, and the molding conditions commonly used in the art can satisfy the requirements of the present invention.
The following is a preferred technical solution of the present invention, but not a limitation to the technical solution provided by the present invention, and the object and advantageous effects of the present invention can be better achieved and achieved by the following preferred technical solution.
In a preferred embodiment of the present invention, the lubricant is selected from any one of naphtha, mineral spirit, paraffin oil, and isoparaffin, or a combination of at least two of them.
Preferably, the lubricant is 15 to 25 parts by weight, for example, 15 parts, 16 parts, 17 parts, 18 parts, 19 parts, 20 parts, 21 parts, 22 parts, 23 parts, 24 parts, 25 parts, or the like, based on 100 parts by weight of the PTFE dispersion resin.
As a preferable technical scheme of the invention, the mixing method comprises the step of mixing by using a two-dimensional or three-dimensional shear-free mixer.
Preferably, the mixing temperature is less than or equal to 19 ℃, for example, 10 ℃, 11 ℃, 12 ℃, 13 ℃, 14 ℃, 15 ℃, 16 ℃, 17 ℃, 18 ℃ or 19 ℃.
Preferably, the rotation speed of the cylinder in the two-dimensional or three-dimensional shear-free blender is 15 to 25rpm, and may be, for example, 15rpm, 16rpm, 17rpm, 18rpm, 19rpm, 20rpm, 21rpm, 22rpm, 23rpm, 24rpm, 25rpm, or the like.
Preferably, the mixing time is 10 to 15min, for example, 10min, 11min, 12min, 13min, 14min, 15min, or the like.
In the invention, the mixing method in the step (1) can be realized by spraying the lubricant into the PTFE lubricating resin, and then mixing the PTFE lubricating resin by using a two-dimensional or three-dimensional shear-free mixer under the conditions that the temperature is less than or equal to 19 ℃ and the rotating speed is 15-25 rpm.
In a preferred embodiment of the present invention, the temperature of the supercritical condition is 31 to 60 ℃ and may be, for example, 31 ℃, 35 ℃, 40 ℃, 45 ℃, 50 ℃, 55 ℃ or 60 ℃.
The pressure under the supercritical conditions is preferably 7.3 to 80MPa, and may be, for example, 7.3MPa, 8MPa, 10MPa, 20MPa, 30MPa, 40MPa, 50MPa, 60MPa, 70MPa or 80MPa.
According to the invention, the PTFE raw material tape with good density and thickness uniformity and good mechanical property can be finally prepared in a short curing time by controlling the temperature and the pressure of the supercritical condition under a specific condition. If the temperature is less than 31 ℃ or the pressure is less than 7.3MPa, the carbon dioxide is not in a supercritical state, and the PTFE raw material tape cannot be prepared by using a supercritical technology; if the temperature is greater than 60 ℃ or the pressure is greater than 80MPa, energy is wasted, and the temperature and pressure of the supercritical condition are limited by the existing equipment, which cannot reach too high temperature and pressure, and the too high temperature and pressure increase the manufacturing and maintenance cost of the equipment.
In a preferred embodiment of the present invention, the aging time is 1 to 3 hours, and may be, for example, 1 hour, 1.5 hours, 2 hours, 2.5 hours, or 3 hours.
As a preferable technical scheme of the invention, the method further comprises a post-treatment step after the curing.
Preferably, the post-treatment method comprises cooling the supercritical carbon dioxide reaction kettle to 30 deg.C or lower (such as 20 deg.C, 21 deg.C, 22 deg.C, 23 deg.C, 24 deg.C, 25 deg.C, 26 deg.C, 27 deg.C, 28 deg.C, 29 deg.C or 30 deg.C), relieving pressure, taking out the aged mixture, and standing.
Preferably, the standing time is not less than 0.5h, for example, 0.5h, 1h, 1.5h, 2h or 2.5 h.
In the invention, the cured mixture is kept still for more than 0.5h, so that carbon dioxide gas can completely overflow from the cured mixture, and the carbon dioxide gas is removed.
As a preferred technical scheme, the forming method comprises preforming, extruding, calendaring and degreasing.
As a preferred technical scheme of the invention, the preparation method specifically comprises the following steps:
(1) Under the conditions that the temperature is less than or equal to 19 ℃ and the rotating speed is 15-25 rpm, a two-dimensional or three-dimensional shear-free mixer is used for mixing PTFE dispersion resin and a lubricant for 10-15 min to obtain a mixture;
(2) Placing the mixture into a supercritical carbon dioxide reaction kettle, curing for 1-3 h under the supercritical conditions that the temperature is 31-60 ℃ and the pressure is 7.3-80 MPa, cooling the supercritical carbon dioxide reaction kettle to below 30 ℃, taking out the cured mixture, and performing, extruding, rolling and degreasing to obtain the PTFE raw material tape.
In a second aspect, the invention provides a PTFE raw material tape prepared by the preparation method of the first aspect.
In a third aspect, the invention provides a use of the PTFE tape of the second aspect for manufacturing a cable mounting line and a data transmission line.
Preferably, the PTFE raw material tape is used for preparing an installation wire and a data transmission wire of an aerospace cable.
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, by utilizing a supercritical technology and taking supercritical carbon dioxide as a transmission medium, a lubricant can better permeate and migrate among PTFE resin particles and can partially enter into swollen resin, so that the PTFE raw material tape with good density and thickness uniformity and good mechanical property is prepared, wherein the standard deviation of the thickness is less than or equal to 1.2 mu m, and particularly is 1.0-1.2 mu m; the standard deviation of the density is less than or equal to 0.015g/cm 3 Specifically 0.013-0.015 g/cm 3 (ii) a The tensile strength is more than or equal to 16.2MPa, specifically 16.2-17.4 MPa, and the elongation at break is more than or equal to 283%, specifically 283% -293%.
Drawings
FIG. 1 is a graph showing the results of testing the amount of lubricant in a mixture after aging at 5 different locations as provided in examples 1-2 and comparative example 1, respectively;
FIG. 2 is a graph showing the results of a lubricant content test on 5 different positions of PTFE strands provided in examples 1 to 2 and comparative example 1, respectively;
FIG. 3 is a graph showing the results of a density test of 5 PTFE strands respectively provided in examples 1 to 2 and comparative example 1 after drying at 150 ℃ for 15 hours.
Detailed Description
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings. It should be understood by those skilled in the art that the examples are only for the understanding of the present invention and should not be construed as the specific limitation of the present invention.
Some of the component sources in the following examples and comparative examples are as follows:
PTFE dispersion resin: kemu Teflon 601X;
lubricant: exxon Mobil, isopar G.
Example 1
The embodiment provides a PTFE raw material tape and a preparation method thereof, wherein the preparation method comprises the following steps:
(1) Spraying 20 parts of lubricant into 100 parts of PTFE dispersion resin under the conditions that the temperature is 15 ℃ and the rotating speed is 20rpm, and mixing for 10min by using a three-dimensional shear-free mixer to obtain a mixture;
(2) Placing the mixture in a supercritical carbon dioxide reaction kettle, curing for 2 hours under the supercritical conditions of 40 ℃ and 40MPa, cooling the supercritical carbon dioxide reaction kettle to below 30 ℃, taking out the cured mixture, placing for more than half an hour to ensure that carbon dioxide gas completely overflows from the cured mixture, then placing the cured material in a blank-pressing and extruding all-in-one machine with a cylinder barrel diameter of 6 cm, pushing and extruding PTFE strips at 25 ℃, then placing in a calender to press into a film with the thickness of 0.1mm and the width of 15mm, and finally degreasing at 270 ℃ to remove a lubricant to obtain the PTFE raw material tape.
Example 2
This example provides a PTFE raw material tape and a method for producing the same, which are different from example 1 only in that in step (2), the supercritical temperature is 40 ℃ and the pressure is 60MPa, and the other conditions are the same as example 1.
Example 3
The embodiment provides a PTFE raw material tape and a preparation method thereof, wherein the preparation method comprises the following steps:
(1) Spraying 15 parts of lubricant into 100 parts of PTFE dispersion resin under the conditions that the temperature is 15 ℃ and the rotating speed is 15rpm, and mixing for 15min by using a three-dimensional shear-free mixer to obtain a mixture;
(2) Placing the mixture into a supercritical carbon dioxide reaction kettle, curing for 1h under the supercritical conditions of 31 ℃ and 80MPa, cooling the supercritical carbon dioxide reaction kettle to below 30 ℃, taking out the cured mixture, placing for 0.5h to ensure that carbon dioxide gas completely overflows from the cured mixture, then placing the cured material into an integrated blank extrusion machine with a cylinder barrel diameter of 6 cm, pushing down and extruding PTFE material strips at 25 ℃, then placing into a calender to press into films with the thickness of 0.1mm and the width of 15mm, and finally degreasing at 270 ℃ to remove a lubricant to obtain the PTFE raw material strip.
Example 4
The embodiment provides a PTFE raw material tape and a preparation method thereof, wherein the preparation method comprises the following steps:
(1) Spraying 25 parts of lubricant into 100 parts of PTFE dispersion resin at the temperature of 12 ℃ and the rotation speed of 25rpm, and mixing for 12min by using a three-dimensional shear-free mixer to obtain a mixture;
(2) Placing the mixture in a supercritical carbon dioxide reaction kettle, curing for 1h under the supercritical conditions of the temperature of 60 ℃ and the pressure of 7.3MPa, cooling the supercritical carbon dioxide reaction kettle to below 30 ℃, taking out the cured mixture, placing for 1h to ensure that carbon dioxide gas completely overflows from the cured mixture, then placing the cured material in a blank-pressing and extruding all-in-one machine with a cylinder barrel diameter of 6 cm, pushing and extruding PTFE strips at 25 ℃, then placing in a calender to press into a film with the thickness of 0.1mm and the width of 15mm, and finally degreasing at 270 ℃ to remove a lubricant to obtain the PTFE raw material tape.
Comparative example 1
The comparative example provides a PTFE raw material tape and a method of making the same, the method comprising:
(1) Spraying 20 parts of lubricant into 100 parts of PTFE dispersion resin at the temperature of 15 ℃ and the rotation speed of 20rpm, and mixing for 10min by using a three-dimensional shear-free mixer to obtain a mixture;
(2) Curing the mixed material obtained in the step (1) for 8 hours at 50 ℃, then putting the cured material into a blank pressing and extruding all-in-one machine with a cylinder barrel diameter of 6 cm, pushing and extruding PTFE material strips at 25 ℃, then putting the material into a calender to press the material strips into a film with the thickness of 0.1mm and the width of 15mm, and finally degreasing at 270 ℃ to remove a lubricant, thereby obtaining the PTFE raw material tape.
10g of the cured compounds of examples 1-2 and comparative example 1 were weighed (denoted W) 1 ) Drying each part of the mixture at 150 ℃ for 3h, and weighing each part of the dried mixture (denoted as W) 2 ) Meter for measuringCalculating the content of lubricant in the aged mixture, the content thereof = (W) 1 -W 2 )/W 2 X 100%. The results of the tests for the amount of lubricant in the aged compound provided in examples 1-2 and comparative example 1 are shown in fig. 1. As can be seen from fig. 1, the data on the content of lubricant in the aged compound obtained at different locations provided in examples 1-2 was more stable, while the data on the content of lubricant in the aged compound obtained at different locations provided in comparative example 1 was more variable.
In examples 1-2 and comparative example 1, the cured material was put into a press-extrusion-integrated machine having a cylinder diameter of 6 cm, extruded PTFE strands were extruded at 25 ℃ and cut at intervals of 3cm to obtain 5 test samples, which were weighed (designated as W) 3 ) Then dried at 150 ℃ for 15h, freed of lubricant therein and weighed (denoted as W) 4 ) Calculating the content of the lubricant in the PTFE strip, wherein the content is = (W) 3 -W 4 )/W 4 X 100%. The results of the lubricant content test of the PTFE strands provided in examples 1-2 and comparative example 1 are shown in fig. 2. As can be seen from fig. 2, the data of the content of the lubricant in the PTFE strands at different positions provided in examples 1-2 is more stable, while the data of the content of the lubricant in the PTFE strands at different positions provided in comparative example 1 is more variable.
The densities of the dried 5 PTFE strands provided in examples 1-2 and comparative example 1 were measured (the test method is described below), and the results are shown in fig. 3. As can be seen from fig. 3, the density data of the dried 5 PTFE strips provided in examples 1-2 are better in stability, while the density data of the dried 5 PTFE strips provided in comparative example 1 are more fluctuant.
After degreasing, the PTFE raw material tapes provided in the above examples and comparative examples were continuously taken 6 meters from the head, middle, and tail portions, respectively, and subjected to thickness, density, tensile strength, and elongation at break tests, specifically as follows:
thickness: and (4) testing according to GB/T6672-2001, wherein each 6 m film test point is not less than 60 points, and calculating the average value and the standard deviation.
Density: and (3) according to the test of GB/T1033.1-2008, each 6 m of film test point is not less than 10 points, and the average value and the standard deviation are calculated.
Tensile strength and elongation at break: testing according to GB/T1040.3-2006, testing 5 splines in each group, and taking an average value.
The performance test results of the PTFE raw material tapes provided in the above examples and comparative examples are shown in table 1 below:
TABLE 1
As can be seen from the content in Table 1, according to the invention, by using the supercritical technology and using supercritical carbon dioxide as a transmission medium, a lubricant can better permeate and migrate among PTFE resin particles and can partially enter into swollen resin, so that the PTFE raw material tape with better density and thickness uniformity and better mechanical property is prepared, wherein the standard deviation of the thickness is less than or equal to 1.2 μm, and specifically is 1.0-1.2 μm; the standard deviation of the density is less than or equal to 0.015g/cm 3 Specifically 0.013-0.015 g/cm 3 (ii) a The tensile strength is more than or equal to 16.2MPa, specifically 16.2-17.4 MPa, and the elongation at break is more than or equal to 283%, specifically 283% -293%.
Compared with the example 1, if the PTFE raw material tape is not prepared by adopting the supercritical technology (the comparative example 1), the curing time is longer, the density and the thickness uniformity of the prepared PTFE raw material tape are poorer, the standard deviation of the thickness and the standard deviation of the density are larger, and the mechanical property of the prepared PTFE raw material tape is poorer.
In conclusion, according to the invention, by using the supercritical technology and using the supercritical carbon dioxide as a transmission medium, the lubricant can better permeate and migrate among PTFE resin particles and can partially enter the swollen resin, so that the PTFE raw material tape with better density and thickness uniformity and better mechanical property is prepared. The PTFE raw material tape provided by the invention is suitable for preparing an installation wire and a data transmission wire of an aerospace cable.
The applicant states that the present invention is illustrated by the detailed process flow of the present invention through the above examples, but the present invention is not limited to the above detailed process flow, that is, it does not mean that the present invention must rely on the above detailed process flow to be implemented. It should be understood by those skilled in the art that any modification of the present invention, equivalent substitutions of the raw materials of the product of the present invention, addition of auxiliary components, selection of specific modes, etc., are within the scope and disclosure of the present invention.
Claims (10)
1. The preparation method of the PTFE raw material tape is characterized by comprising the following steps:
(1) Mixing PTFE dispersion resin and a lubricant to obtain a mixture;
(2) And placing the mixture in a supercritical carbon dioxide reaction kettle, curing under a supercritical condition, and then molding to obtain the PTFE raw material tape.
2. The method according to claim 1, wherein the lubricant is selected from any one of naphtha, mineral spirit, paraffin oil or isoparaffin or a combination of at least two of them;
preferably, the lubricant is 15 to 25 parts by weight based on 100 parts by weight of the PTFE dispersion resin.
3. The method of claim 1 or 2, wherein the mixing comprises mixing using a two-dimensional or three-dimensional shear-free blender;
preferably, the temperature of the mixing is less than or equal to 19 ℃;
preferably, the rotating speed of a charging barrel in the two-dimensional or three-dimensional shear-free mixer is 15-25 rpm;
preferably, the mixing time is 10 to 15min.
4. The method according to any one of claims 1 to 3, wherein the temperature of the supercritical condition is 31 to 60 ℃;
preferably, the pressure of the supercritical condition is 7.3 to 80MPa.
5. The method according to any one of claims 1 to 4, wherein the aging time is 1 to 3 hours.
6. The method according to any one of claims 1 to 5, wherein the aging is followed by a post-treatment step;
preferably, the post-treatment method comprises the steps of cooling the supercritical carbon dioxide reaction kettle to below 30 ℃, decompressing, taking out the cured mixture, and standing;
preferably, the standing time is more than or equal to 0.5h.
7. The method of any one of claims 1-6, wherein the shaping comprises preforming, extruding, calendering, and degreasing.
8. The preparation method according to any one of claims 1 to 7, characterized in that it comprises in particular the steps of:
(1) Under the conditions that the temperature is less than or equal to 19 ℃ and the rotating speed is 15-25 rpm, a two-dimensional or three-dimensional shear-free mixer is used for mixing PTFE dispersion resin and a lubricant for 10-15 min to obtain a mixture;
(2) Placing the mixture into a supercritical carbon dioxide reaction kettle, curing for 1-3 h under the supercritical conditions that the temperature is 31-60 ℃ and the pressure is 7.3-80 MPa, cooling the supercritical carbon dioxide reaction kettle to below 30 ℃, taking out the cured mixture, and performing, extruding, rolling and degreasing to obtain the PTFE raw material tape.
9. A PTFE raw material tape prepared by the preparation method according to any one of claims 1 to 8.
10. The use of the PTFE tape according to claim 9, wherein the PTFE tape is used for manufacturing a cable mounting line, a data transmission line;
preferably, the PTFE raw material tape is used for preparing an installation wire and a data transmission wire of an aerospace cable.
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