CN108912359A - A kind of high bubble pressure microporous teflon membran and preparation method thereof - Google Patents
A kind of high bubble pressure microporous teflon membran and preparation method thereof Download PDFInfo
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- CN108912359A CN108912359A CN201810599047.2A CN201810599047A CN108912359A CN 108912359 A CN108912359 A CN 108912359A CN 201810599047 A CN201810599047 A CN 201810599047A CN 108912359 A CN108912359 A CN 108912359A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2327/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers
- C08J2327/02—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment
- C08J2327/12—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
- C08J2327/18—Homopolymers or copolymers of tetrafluoroethylene
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Abstract
The present invention provides a kind of high bubble pressure microporous teflon membran and preparation method thereof.The present invention may be implemented to be completely pulled out fibril under very low stretching ratio by optimization drawing process, so that it is small and uniform to obtain micropore size, and the very high microporous teflon membran product of porosity.Meanwhile small and uniform aperture is able to achieve very high bubble pressure, high porosity is able to achieve cracking flow rate of liquid, and lower stretching ratio ensure that biggish film surface density, be able to achieve very high film strength.Therefore, microporous teflon membran prepared by the present invention has the advantages that bubble point pressure is high, flow rate of liquid is fast and film-strength is high, overcomes the deficiencies in the prior art.
Description
Technical field
The invention belongs to microporous teflon membran preparation technical field more particularly to a kind of high bubble pressures, fast flow velocity, high-strength
Spend microporous teflon membran and preparation method thereof.
Background technique
Polytetrafluoroethylene (PTFE)（Hereinafter referred to as PTFE）Microporous barrier since the advent of the world, due to its excellent strainability and unique
Material property is increasingly used in household filter, medical filter, industrial filter bag, garment material and seal assembly
Equal fields.
PTFE has excellent chemical stability and thermal stability, has it under environment and worst hot case outdoors good
Service performance and service life；PTFE also has low-surface-energy and nonpolarity, therefore possesses strong-hydrophobicity and moisture resistance, and
With certain self-cleaning ability, so that PTFE is highly suitable for filtering material and fabric.PTFE dispersion resin is through paste
Extrusion, stretch processes are prepared into the film with unique microcellular structure, and aperture is generally at 0.1-10 μm, and porosity is about
80-90%。
Requirement to microporous teflon membran aspect of performance, needs its filtering accuracy height and energy loss is small, filtering essence
Degree is generally characterized using bubble point pressure or intercepting efficiency, and energy loss generally uses flow rate of liquid or Air permenbility carry out table
Sign.Therefore, the bubble point pressure of the PTFE microporous barrier of high filtering precision is big, intercepting efficiency is high, the PTFE microporous barrier of low energy consumption loss
Flow rate of liquid is fast, Air permenbility is big.
However, filtering accuracy and energy loss are often conflicting, it is difficult to realize the common promotion of the two performance, side's property
Another party's performance is often sacrificed while capable of being promoted, and to realize the common promotion of the two performance, it is necessary to optimize microcellular structure, mention
Porosity is risen, this is the most crucial problem of PTFE micropore field of membrane preparation.
The PTFE of Bao Erqiang a kind of while that small particle and low flow resistance are provided is described in patent CN101242889A
Filter membrane and preparation method thereof, after multilayer laminated, using cross directional stretch-longitudinal direction drawing by high temperature-transverse direction drawing by high temperature
High-intensitive, low flow resistance and small-bore porous PTFE film is prepared in technique, and the method needs to obtain by stacking
The film product of high bubble pressure, and process flow is more complex, has some limitations in actual production and application.
The PTFE perforated membrane that a kind of aperture is small, arresting efficiency is high and the pressure loss is small is described in patent CN1102748A
And preparation method thereof, by high temperature longitudinal stretching near PTFE fusing point, find cross directional stretch multiplying power improve will not hole diameter enlargement,
To obtain the small film in aperture, the balance of high arresting efficiency and low pressure loss is realized, but the film of the method preparation is very thin,
Intensity is undesirable, has some limitations in practical application.
A kind of gas permeability is described in patent CN101888928A and water pressure resistance is high and the PTFE perforated membrane of film thickness thickness and its
Preparation method obtains one by the first porous body and biaxial stretch-formed the second obtained porous body layer poststack that will be uniaxially stretched
Kind compound PTFE perforated membrane, the first porous body thickness is big, Air permenbility is high but it is water-fast force down, the second porous body thickness is small, Air permenbility
Low and water pressure resistance is very high, therefore, the compound PTFE perforated membrane of the method preparation has high-intensitive, highly-breathable and high water pressure resistance
Feature, the second porous body in the method is using conventional bidirectional extending method preparation, and Air permenbility is smaller, and the intensity being laminated
There are biggish risk, had some limitations in practical application.
As described above, there is certain for the high bubble point microporous teflon membran of passing above-mentioned each art solutions preparation
Defect.Therefore, in view of the above-mentioned problems, it is necessary to propose further solution.
Summary of the invention
It is existing to overcome the purpose of the present invention is to provide a kind of high bubble pressure microporous teflon membran and preparation method thereof
Deficiency present in technology.
For achieving the above object, the present invention provides a kind of preparation method of high bubble pressure microporous teflon membran,
Include the following steps：
S1, polytetrafluoroethylene (PTFE) disperse materials and auxiliary agent oil are provided, the powder that polytetrafluoroethylene (PTFE) disperse materials and auxiliary agent oil mix is passed through
Polytetrafluoroethylene (PTFE) base band is obtained after extrusion calendaring, and drying defatted processing is carried out to PTFE base band；
S2, longitudinal stretching is carried out to by the PTFE base band of drying defatted；
After the completion of S3, longitudinal stretching, cross directional stretch is carried out again to polytetrafluoroethylene (PTFE) base band；
S4, thermal finalization is carried out to by PTFE base band stretching in the transverse direction, obtains high bubble pressure microporous teflon membran.
The improvement of preparation method as high bubble pressure microporous teflon membran of the invention when carrying out longitudinal stretching, is drawn
Stretching temperature is 330-380 DEG C.
The improvement of preparation method as high bubble pressure microporous teflon membran of the invention, when carrying out longitudinal stretching, institute
Stating tensile speed is 1000-1500%/s.
The improvement of preparation method as high bubble pressure microporous teflon membran of the invention when carrying out longitudinal stretching, gathers
Tetrafluoroethene base band longitudinal stretching roller cornerite at 240 ° or more.
The improvement of preparation method as high bubble pressure microporous teflon membran of the invention when carrying out cross directional stretch, is drawn
Temperature is stretched at 200 DEG C or less.
The improvement of preparation method as high bubble pressure microporous teflon membran of the invention, draws by vertical and horizontal
It stretches, the total stretching ratio of transverse and longitudinal is within 100 times.
For achieving the above object, the present invention provides a kind of high bubble pressure polytetrafluoro obtained by preparation method as described above
Ethylene microporous barrier, the bubble point pressure of the high bubble pressure microporous teflon membran are 0.17-0.35MPa, the high bubble pressure poly- four
Air permenbility of the fluoride microporous film under 500Pa pressure difference is 15-40mm/s, the liquid of the high bubble pressure microporous teflon membran
Flow velocity is 5-15s.
As the improvement of high bubble pressure microporous teflon membran of the invention, the high bubble pressure microporous teflon membran
With a thickness of 15-50 μm.
As the improvement of high bubble pressure microporous teflon membran of the invention, the high bubble pressure microporous teflon membran
Average pore size is 0.08-0.2 μm.
Compared with prior art, the beneficial effects of the invention are as follows：The present invention may be implemented by optimization drawing process very
It is completely pulled out fibril under low stretching ratio, so that it is small and uniform to obtain micropore size, and the very high polytetrafluoroethyl-ne of porosity
Alkene microporous film products.Meanwhile small and uniform aperture is able to achieve very high bubble pressure, high porosity is able to achieve cracking liquid flow
Speed, lower stretching ratio ensure that biggish film surface density, be able to achieve very high film strength.Therefore, prepared by the present invention
Microporous teflon membran have the advantages that bubble point pressure is high, flow rate of liquid is fast and film-strength is high, overcome in the prior art
Existing deficiency.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The some embodiments recorded in invention, for those of ordinary skill in the art, without creative efforts,
It is also possible to obtain other drawings based on these drawings.
Fig. 1 is the plane signal of longitudinal stretching mechanism in the preparation method of high bubble pressure microporous teflon membran of the invention
Figure；
Fig. 2 is the microcosmic SEM photograph of high bubble pressure microporous teflon membran of the invention.
Specific embodiment
The present invention is described in detail for each embodiment shown in reference to the accompanying drawing, but it should be stated that, these
Embodiment is not limitation of the present invention, those of ordinary skill in the art according to these embodiments made by function, method,
Or equivalent transformation or substitution in structure, all belong to the scope of protection of the present invention within.
It is excessively thin that the high bubble pressure PTFE perforated membrane of prior art preparation, total stretching ratio will lead to film when excessive, to lead
Cause intensity undesirable, bubble pressure is lower, needs to be improved by overlapped way, and total stretching ratio will lead to percent opening not when too small
Height, little so as to cause flow rate of liquid, Air permenbility is lower.
In view of the above-mentioned problems, the preparation method of high bubble pressure microporous teflon membran of the invention includes the following steps：
S1, polytetrafluoroethylene (PTFE) disperse materials and auxiliary agent oil are provided, the powder that polytetrafluoroethylene (PTFE) disperse materials and auxiliary agent oil mix is passed through
Polytetrafluoroethylene (PTFE) base band is obtained after extrusion calendaring, and drying defatted processing is carried out to PTFE base band.
Specifically, selection standard relative density of the present invention（SSG）It is smaller, the higher PTFE disperse materials of molecular weight, such as U.S.
The F106 that the 601A of E.I.Du Pont Company's production, Daikin company produce, the 216Y etc. of middle sky morning twilight Chemical Manufacture.Molecular weight is higher
Raw material one side fibril be easier pulled out from node, the bulk density of fiber is higher, and membrane aperture is smaller, another aspect fibril
Intensity is larger, and the PTFE micropore film strength of preparation is also higher.In addition, the present invention selects kinematic viscosity higher, initial boiling point is lower
And the auxiliary agent oil that boiling range range is relatively narrow, it can be aviation kerosine, be also possible to synthesizing alkanes, as Exxon Mobil Corporation produces
Isoparaffin.
In one embodiment, the step S1 prepares polytetrafluoroethylene (PTFE) base band as follows：
After above-mentioned polytetrafluoroethylene (PTFE) disperse materials and auxiliary agent oil are sufficiently mixed uniformly by a certain percentage, it is placed in one in constant temperature oven
It fixes time and is cured, guarantee that auxiliary agent oil fully absorbs swelling by polytetrafluoroethylene (PTFE) powder.Complete polytetrafluoroethylene (PTFE) will be cured
Mixed powder pours into pre-press equipment, is pressed into cylindricality material embryo in advance, then material embryo is put into extruder, be extruded into cylindrical rod embryo or
Band-like film.Then the teflon rod embryo obtained will be squeezed out or diaphragm is sent into roller calender, be prepared with one
Determine thickness and width, and the polytetrafluoroethylene (PTFE) of film surface uniform ground rolls base band.By way of evaporating or extracting, poly- four are removed
Vinyl fluoride rolls the auxiliary agent oil in base band, obtains the dry base band of polytetrafluoroethylene (PTFE).
S2, longitudinal stretching is carried out to by the PTFE base band of drying defatted.
Carry out longitudinal stretching when, guarantee draft temperature more than polytetrafluoroethylene (PTFE) fusing point, and tensile speed be greater than 1000%/
s.Preferably, draft temperature is 330-380 DEG C, tensile speed 1000-1500%/s.In addition, when carrying out longitudinal stretching, poly- four
Fluoride-based band longitudinal stretching roller cornerite at 240 ° or more.
Further, in longitudinal stretching process, fibril is largely pulled out from node and occurs significantly to be orientated, micropore
It preliminarily forms, the structure of most telolemma product is served conclusive, therefore, vertical drawing process is the key that in entire film-forming process
Technique.Longitudinal stretching through the invention, so that node can become very small and dense collection when High Temperature And Velocity acts on simultaneously,
Fibril is sufficiently pulled out from node, even and if above-mentioned variation can generate under very low stretching ratio.
In order to realize above-mentioned longitudinal stretching, the present invention is stretched using a kind of longitudinal stretching mechanism.
As shown in Figure 1, the longitudinal stretching mechanism includes：A pair of first guide reel 2,7, a pair of of draw roll 4,5, Yi Dui
Two guide reels 3,6.
Specifically, a pair of first guide reel 2,7 is for drawing base band disengaging baking oven.
Core of a pair of of draw roll 4,5 as entire vertical drawing mechanism, the size needs of roller are sufficiently large, avoid base band
It skids during stretching, roller diameter is at least in 200mm or more, and preferably in 350mm or more, the surface temperature of roller needs foot
Enough height, at least at 330 DEG C or more, preferably at 380 DEG C or more, the installation site between roller will be as close as possible to the tangent line of the two
The distance L of position is at least within 100mm, preferably within 50mm.
A pair of second guide reel 3,6 is used to control base band and is stretching the cornerite on roller, prevents from skidding, base band is in draw roll
Wrap angle sigma on cylinder is at least at 240 ° or more.The rate of extension of vertical drawing mechanism of the invention can achieve 1000%/s or more, than one
As even tens times of high several times of rate of extension of drawing mechanism, under the action of superelevation rate, node is sufficiently pulled open, and size is very
It is small and be evenly distributed.
The draft temperature of above-mentioned longitudinal stretching mechanism can achieve PTFE fusing point or more, and under high temperature action, fibril holds very much
It is easily attenuated elongation, the fiber size of acquisition is relatively thin and accumulation is closeer.Under acting on while high-speed and high temperature, node becomes
Very little, fiber become not only thin but also close, and therefore, the micropore that node-fibre structure is formed is small and uniform, and porosity is high.
The calculation formula of vertical pulling rate rate is as follows：
。
In formula：B：Extension ratio；t：Extension of time；V1：4 speed of roller；V2：5 speed of roller；L：Extended distance.
As can be seen that extended distance is shorter when roller 5 and the speed difference of roller 4 are bigger from above-mentioned calculation formula, pulling rate rate is indulged just
Bigger, therefore, the present invention controls the size of vertical pulling rate rate by control 4 speed V1 of roller, roller 5 speed V2, extended distance L.
After the completion of S3, longitudinal stretching, cross directional stretch is carried out again to polytetrafluoroethylene (PTFE) base band.
During cross directional stretch, controlling draft temperature and multiplying power all cannot be too high, and it is excessive and steep that no person will lead to aperture
It presses through low.Draft temperature controls within 200 DEG C, and stretching ratio controls within 25 times.Film after stretching horizontally need into
Row thermal finalization processing, prevents film from generating contraction in relaxed state.
S4, thermal finalization is carried out to by PTFE base band stretching in the transverse direction, obtains high bubble pressure polytetrafluoroethylene (PTFE) micropore
Film.In addition, guaranteeing to stretch by vertical and horizontal, the total stretching ratio of transverse and longitudinal is within 100 times.
Wherein, preparation method through the invention makes, even if carrying out thermal finalization processing, hole by 350 DEG C or more high temperature
Diameter does not have big variation, moreover it is possible to have very high bubble pressure.
Based on preparation method as described above, the present invention also provides a kind of high bubble pressures obtained by method produced above poly- four
Fluoride microporous film.
Specifically, in the high bubble pressure microporous teflon membran, fibril is sufficiently pulled out from node and transverse and longitudinal direction interlocks
Distribution, forms small and uniform aperture, and mean pore size is 0.08-0.2 μm.The high bubble pressure microporous teflon membran
With a thickness of 15-50 μm.The bubble point pressure of the high bubble pressure microporous teflon membran is 0.17-0.35MPa.The height
The flow rate of liquid of bubble pressure microporous teflon membran is 5-15s.The high bubble pressure microporous teflon membran is in 500Pa pressure difference
Under Air permenbility be 15-40mm/s.
In order to prove the every excellent performance of high bubble pressure microporous teflon membran of the invention.The present invention uses
Following test method tests the properties of high bubble pressure microporous teflon membran.
1, microstructure
With PhenomPro type desk type scanning electronic microscope（SEM）Observe the microstructure of film, shape and ruler including node
It is very little, the direction of fiber and size.Its microstructure is as shown in Figure 2.
2, average pore size measures
Membrane pore size is measured with 9510 type mercury injection apparatus of AutoPoreIV：PTFE film samples weighing 0.05g or so, is put into sample cell
And be re-weighed after encapsulating, be first evacuated to after 50 μm of Hg or less and carry out low-pressure analysis, after weigh, refill the laggard horizontal high voltage of sample
Analysis is calculated the mean pore size for obtaining sample by instrument.
3, thickness measurement
Calibrator is divided to measure film thickness with CH-1-S type thousand.After measured, high bubble pressure microporous teflon membran with a thickness of 15-
50μm。
4, bubble point pressure measures
With the bubble point pressure for the filter membrane bubble pressure tester measurement film that section's promise produces：Diaphragm is placed in alcohol first and is sufficiently soaked
Then alcohol is poured on mesh plate and slow air inlet, measures first bubble by profit, then be installed below mesh plate and seal fixation
Point out current pressure, i.e. bubble point pressure.After measured, the bubble point pressure of high bubble pressure microporous teflon membran is 0.17-
0.35MPa。
5, flow rate of liquid measures
With the flow rate of liquid for the filter membrane flow velocity tester measurement film that section's promise produces：Diaphragm is placed in alcohol first and is sufficiently soaked
Profit, then it is installed below graduated cylinder and seals fixation, measurement 50ml water passes through the time of film, i.e. liquid in the case where an atmospheric pressure acts on
Body flow velocity.After measured, the flow rate of liquid of high bubble pressure microporous teflon membran is 5-15s.
6, Air permenbility measures
The Air permenbility that must firmly believe the full-automatic air permeability tester measurement film of production, sets pressure difference as 500Pa.Through surveying
Fixed, the Air permenbility of high bubble pressure microporous teflon membran is 15-40mm/s.
Below with reference to specific embodiment and comparative example, technical solution of the present invention is illustrated.
Embodiment 1
It selects Du Pont 601A polyflon and 3# aviation kerosine after evenly mixing, it is small to be placed in curing 24 in constant temperature oven
When.Complete PTFE mixed powder precompressed will be cured and be extruded into cylindrical bar embryo, the calendering of stick embryo then will be squeezed out and obtain thickness
For 200 μm of polytetrafluoroethylene (PTFE) base band.By the base band of calendering acquisition by drying and removing auxiliary agent oil.Dry base band is drawn by vertical
Mechanism carries out longitudinal stretching, and stretching roller temperature is 330 DEG C, rate of extension 1000%/s, and stretching ratio is 4 times.By vertical drawing base
Band carries out cross directional stretch by lateral tenter, and draft temperature is 150 DEG C, and stretching ratio is 20 times, last thermal finalization film forming.Institute
State microporous teflon membran fibril from node sufficiently pull out and transverse and longitudinal direction be interspersed, stacking form small and uniform hole
Diameter, as shown in Fig. 2, performance parameter are listed in subordinate list 1.
Embodiment 2
It selects Du Pont 601A polyflon and 3# aviation kerosine after evenly mixing, it is small to be placed in curing 24 in constant temperature oven
When.Complete PTFE mixed powder precompressed will be cured and be extruded into cylindrical bar embryo, the calendering of stick embryo then will be squeezed out and obtain thickness
For 200 μm of polytetrafluoroethylene (PTFE) base band.By the base band of calendering acquisition by drying and removing auxiliary agent oil.Dry base band is drawn by vertical
Mechanism carries out longitudinal stretching, and stretching roller temperature is 380 DEG C, rate of extension 1500%/s, and stretching ratio is 4 times.By vertical drawing base
Band carries out cross directional stretch by lateral tenter, and draft temperature is 150 DEG C, and stretching ratio is 20 times, last thermal finalization film forming.Institute
The performance parameter for stating microporous teflon membran is listed in subordinate list 1.
Embodiment 3
It selects great Jin F106 polyflon and Mobil ISOPARG type auxiliary agent oil after evenly mixing, is placed in constant temperature oven
Middle curing 24 hours.Complete PTFE mixed powder precompressed will be cured and be extruded into cylindrical bar embryo, then will squeeze out stick embryo pressure
Prolong the polytetrafluoroethylene (PTFE) base band obtained with a thickness of 200 μm.By the base band of calendering acquisition by drying and removing auxiliary agent oil.It will dry base
Band carries out longitudinal stretching by vertical drawing mechanism, and stretching roller temperature is 350 DEG C, rate of extension 1200%/s, stretching ratio 4
Times.Vertical drawing base band is passed through into lateral tenter and carries out cross directional stretch, draft temperature is 150 DEG C, and stretching ratio is 20 times, last heat
Sizing film forming.The performance parameter of the microporous teflon membran is listed in subordinate list 1.
Embodiment 4
It selects great Jin F106 polyflon and Mobil ISOPARG type auxiliary agent oil after evenly mixing, is placed in constant temperature oven
Middle curing 24 hours.Complete PTFE mixed powder precompressed will be cured and be extruded into cylindrical bar embryo, then will squeeze out stick embryo pressure
Prolong the polytetrafluoroethylene (PTFE) base band obtained with a thickness of 200 μm.By the base band of calendering acquisition by drying and removing auxiliary agent oil.It will dry base
Band carries out longitudinal stretching by vertical drawing mechanism, and stretching roller temperature is 330 DEG C, rate of extension 1000%/s, stretching ratio 3
Times.Vertical drawing base band is passed through into lateral tenter and carries out cross directional stretch, draft temperature is 100 DEG C, and stretching ratio is 15 times, last heat
Sizing film forming.The performance parameter of the microporous teflon membran is listed in subordinate list 1.
Comparative example 1
It selects Du Pont 601A polyflon and 3# aviation kerosine after evenly mixing, it is small to be placed in curing 24 in constant temperature oven
When.Complete PTFE mixed powder precompressed will be cured and be extruded into cylindrical bar embryo, the calendering of stick embryo then will be squeezed out and obtain thickness
For 200 μm of polytetrafluoroethylene (PTFE) base band.By the base band of calendering acquisition by drying and removing auxiliary agent oil.Dry base band is drawn by vertical
Mechanism carries out longitudinal stretching, and stretching roller temperature is 250 DEG C, rate of extension 150%/s, and stretching ratio is 4 times.By vertical drawing base
Band carries out cross directional stretch by lateral tenter, and draft temperature is 150 DEG C, and stretching ratio is 20 times, last thermal finalization film forming.Institute
The performance parameter for stating microporous teflon membran is listed in Table 1 below.
The performance parameter of 1 microporous teflon membran of table
In conclusion the present invention may be implemented to be completely pulled out fibril under very low stretching ratio by optimization drawing process,
It is small and uniform to obtain micropore size, and the very high microporous teflon membran product of porosity.Meanwhile small and uniform hole
Diameter is able to achieve very high bubble pressure, and high porosity is able to achieve cracking flow rate of liquid, and lower stretching ratio ensure that biggish thin
Film surface density is able to achieve very high film strength.Therefore, microporous teflon membran prepared by the present invention has bubble point pressure
The advantage high, flow rate of liquid is fast and film-strength is high, overcomes the deficiencies in the prior art.
It is obvious to a person skilled in the art that invention is not limited to the details of the above exemplary embodiments, Er Qie
In the case where without departing substantially from spirit or essential attributes of the invention, the present invention can be realized in other specific forms.Therefore, no matter
From the point of view of which point, the present embodiments are to be considered as illustrative and not restrictive, and the scope of the present invention is by appended power
Benefit requires rather than above description limits, it is intended that all by what is fallen within the meaning and scope of the equivalent elements of the claims
Variation is included within the present invention.Any reference signs in the claims should not be construed as limiting the involved claims.
In addition, it should be understood that although this specification is described in terms of embodiments, but not each embodiment is only wrapped
Containing an independent technical solution, this description of the specification is merely for the sake of clarity, and those skilled in the art should
It considers the specification as a whole, the technical solutions in the various embodiments may also be suitably combined, forms those skilled in the art
The other embodiments being understood that.
Claims (9)
1. a kind of preparation method of high bubble pressure microporous teflon membran, which is characterized in that the preparation method includes following step
Suddenly：
S1, polytetrafluoroethylene (PTFE) disperse materials and auxiliary agent oil are provided, the powder that polytetrafluoroethylene (PTFE) disperse materials and auxiliary agent oil mix is passed through
Polytetrafluoroethylene (PTFE) base band is obtained after extrusion calendaring, and drying defatted processing is carried out to PTFE base band；
S2, longitudinal stretching is carried out to by the PTFE base band of drying defatted；
After the completion of S3, longitudinal stretching, cross directional stretch is carried out again to polytetrafluoroethylene (PTFE) base band；
S4, thermal finalization is carried out to by PTFE base band stretching in the transverse direction, obtains high bubble pressure microporous teflon membran.
2. the preparation method of high bubble pressure microporous teflon membran according to claim 1, which is characterized in that carry out longitudinal
When stretching, draft temperature is 330-380 DEG C.
3. the preparation method of high bubble pressure microporous teflon membran according to claim 1, which is characterized in that carry out longitudinal
When stretching, the tensile speed is 1000-1500%/s.
4. the preparation method of high bubble pressure microporous teflon membran according to claim 1, which is characterized in that carry out longitudinal
When stretching, polytetrafluoroethylene (PTFE) base band longitudinal stretching roller cornerite at 240 ° or more.
5. the preparation method of high bubble pressure microporous teflon membran according to claim 1, which is characterized in that carry out laterally
When stretching, draft temperature is at 200 DEG C or less.
6. the preparation method of high bubble pressure microporous teflon membran according to claim 1, which is characterized in that by longitudinal
And cross directional stretch, the total stretching ratio of transverse and longitudinal is within 100 times.
7. a kind of high bubble pressure microporous teflon membran obtained by any one of the claim 1-6 preparation method, feature
It is, the bubble point pressure of the high bubble pressure microporous teflon membran is 0.17-0.35MPa, the high bubble pressure polytetrafluoroethylene (PTFE)
Air permenbility of the microporous barrier under 500Pa pressure difference is 15-40mm/s, and the flow rate of liquid of the high bubble pressure microporous teflon membran is
5-15s。
8. high bubble pressure microporous teflon membran according to claim 7, which is characterized in that the high bubble pressure polytetrafluoroethyl-ne
Alkene microporous barrier with a thickness of 15-50 μm.
9. high bubble pressure microporous teflon membran according to claim 7, which is characterized in that the high bubble pressure polytetrafluoroethyl-ne
The average pore size of alkene microporous barrier is 0.08-0.2 μm.
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Cited By (8)
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| CN109912909A (en) * | 2019-02-21 | 2019-06-21 | 南通东屹高新纤维科技有限公司 | The preparation method of fabric polyfluortetraethyleventilated ventilated membrane |
| CN110054855A (en) * | 2019-02-18 | 2019-07-26 | 浙江格尔泰斯环保特材科技股份有限公司 | A kind of polytetrafluoroethylene (PTFE) bubble point film and preparation method thereof |
| CN111359311A (en) * | 2020-03-12 | 2020-07-03 | 苏州优可发新材料科技有限公司 | Preparation method of high-efficiency polytetrafluoroethylene microporous membrane and membrane laminating material |
| CN111627606A (en) * | 2020-05-25 | 2020-09-04 | 浙江德通科技有限公司 | High-flame-retardancy coaxial radio frequency cable and preparation method thereof |
| CN111645345A (en) * | 2020-05-25 | 2020-09-11 | 天津渤海万业科技有限公司 | High-strength polytetrafluoroethylene cable film and preparation method thereof |
| CN114643703A (en) * | 2022-03-24 | 2022-06-21 | 江苏集萃功能材料研究所有限公司 | Film stretching system and application thereof |
| CN116063809A (en) * | 2021-11-01 | 2023-05-05 | 中国石油化工股份有限公司 | High-air-permeability polytetrafluoroethylene fiber membrane material for sterilization and preparation method and application thereof |
| CN116059849A (en) * | 2021-11-01 | 2023-05-05 | 中国石油化工股份有限公司 | Polytetrafluoroethylene compound and porous membrane thereof, preparation method and application |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110054855A (en) * | 2019-02-18 | 2019-07-26 | 浙江格尔泰斯环保特材科技股份有限公司 | A kind of polytetrafluoroethylene (PTFE) bubble point film and preparation method thereof |
| CN110054855B (en) * | 2019-02-18 | 2021-10-15 | 浙江格尔泰斯环保特材科技股份有限公司 | Polytetrafluoroethylene bubble point membrane and preparation method thereof |
| CN109912909A (en) * | 2019-02-21 | 2019-06-21 | 南通东屹高新纤维科技有限公司 | The preparation method of fabric polyfluortetraethyleventilated ventilated membrane |
| CN111359311A (en) * | 2020-03-12 | 2020-07-03 | 苏州优可发新材料科技有限公司 | Preparation method of high-efficiency polytetrafluoroethylene microporous membrane and membrane laminating material |
| CN111627606A (en) * | 2020-05-25 | 2020-09-04 | 浙江德通科技有限公司 | High-flame-retardancy coaxial radio frequency cable and preparation method thereof |
| CN111645345A (en) * | 2020-05-25 | 2020-09-11 | 天津渤海万业科技有限公司 | High-strength polytetrafluoroethylene cable film and preparation method thereof |
| CN116063809A (en) * | 2021-11-01 | 2023-05-05 | 中国石油化工股份有限公司 | High-air-permeability polytetrafluoroethylene fiber membrane material for sterilization and preparation method and application thereof |
| CN116059849A (en) * | 2021-11-01 | 2023-05-05 | 中国石油化工股份有限公司 | Polytetrafluoroethylene compound and porous membrane thereof, preparation method and application |
| CN114643703A (en) * | 2022-03-24 | 2022-06-21 | 江苏集萃功能材料研究所有限公司 | Film stretching system and application thereof |
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Application publication date: 20181130 |