CN103285747B - Three-dimensional PTFE microporous membrane for filtration and preparation method thereof - Google Patents
Three-dimensional PTFE microporous membrane for filtration and preparation method thereof Download PDFInfo
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Abstract
The invention relates to a PTFE (polytetrafluoroethylene) membrane for filtration and a manufacturing method thereof, in particular to a three-dimensional PTFE microporous membrane for filtration and a manufacturing method thereof. A three-dimensional PTFE microporous membrane for filtration is a multilayer membrane; the PTFE microporous membrane has the air permeability of 4-8 cm/s, the elongation at break of 150-180% and the average pore diameter of 0.2-2.5 microns. The three-dimensional PTFE microporous membrane for filtration prepared by the invention not only can simultaneously give consideration to air permeability and tensile fracture strength, but also can form fine bulges by performing active treatment on the surface of the membrane, thereby greatly improving the surface activity and the adhesive force.
Description
Technical field
The present invention relates to a kind of PTFE membrane for filtration and manufacture method thereof, be specifically related to a kind of filtration by three-dimensional PTFE microporous barrier and manufacture method thereof.
Background technology
Polytetrafluoroethylene (PTFE) has excellent high and low temperature resistance, outstanding chemical resistance, has " King " title, and good dielectric properties and hydrophobicity.The PTFE film adopting polytetrafluoroethylene (PTFE) to prepare as raw material, can protect filtering substrate to extend its service life better, improves filtering accuracy and the filter efficiency of filtering material, meets the requirement of industry environmental protection and cleaner production.As the patent publication No. Chinese patent that is 101920559A (201-12-22) discloses a kind of preparation method and goods thereof of polytetrafluoroethylene film, although polytetrafluoroethylene film prepared by the method possesses certain dimensional stability, air penetrability is not high.And at present, PTFE film is as a kind of atomic membrane material of filtration & separation of function admirable, and the important physical parameter weighing its performance is air penetrability and tensile break strength.The former determines the complexity of ash-laden gas by filter medium, has showed the transporting of medium to gas; And the latter determines the service life of film because fracture strength more Gao Ze is longer for service life.But air penetrability and tensile break strength are conflict bodies, tensile break strength is that the tension failure on unit area is powerful, and formula is intensity P=powerful F/ sectional area S, thickness is thicker, and sectional area S is less, and intensity P is larger, but the thickness of film is thicker, and air penetrability is lower, and strainability is poorer.How to obtain the good tensile break strength of air penetrability PTFE microporous barrier high is again the technical barrier that filtrate people explores always.
PTFE film material will play its superior performance as filtering material simultaneously, and the surface that must be attached to filtering substrate uses.And well-known, PTFE limitation table surface tension is little, and surface energy is low, inertia is larger, be difficult to other material bonding and after bond firmness not quite, therefore how to improve the surface-active of PTFE film material, be also one of content of studying of the present invention together with filtering substrate good bond.
Summary of the invention
The present invention's first object is for solving the problems of the technologies described above, and provides a kind of and filters with three-dimensional PTFE microporous barrier.Another object of the present invention is to provide a kind of preparation method filtered with three-dimensional PTFE microporous barrier.Filtration prepared by the present invention not only can take into account Air permenbility with three-dimensional PTFE microporous barrier simultaneously and tension failure is powerful, and by carrying out activity process to stereoscopic film surface, forms tiny projection, greatly improve surface-active, improves adhesive force.
First object of the present invention is achieved by the following technical programs: the three-dimensional PTFE microporous barrier of a kind of filtration, and described PTFE microporous barrier is multilayer film; The air penetrability of described PTFE microporous barrier is 4-8 cel, and elongation at break is 150-180%, and average pore size is 0.2-2.5 micron.
Traditional PTFE film is produced and is taked batch mixing, beat embryo, extrude, roll, indulge and draw, horizontally draw six procedures.Extruding in workshop section, cylinder blank enters the preformation die cavity compacting of pushing cylinder entrance point, is full of gradually to push in the middle part of cylinder and expects chamber, exports shaping die orifice finally by pushing cylinder.The cross-sectional area of this stage blank, by reducing greatly, is referred to as compression ratio (RR), is obtained by the business of the preformation die cavity cross-sectional area S1 and the port of export shaping die orifice cross-sectional area S2 that push cylinder entrance point.The size of compression ratio directly affects the quality of film product.Compression ratio is larger, and film is thicker, and intensity is higher, and air penetrability is less.In traditional handicraft, extruding zone adopts circular port mould, and what push out is cylinder membranes rod, and compression ratio is higher, fracture strength is better, but be circular port mould due to what adopt, stretching capability is poor, when rolling, material can flow to middle with both sides simultaneously, intermediate flow speed is often greater than both sides, thus causes tearing or producing shirt rim of calendering band, affects the skewness of finished product film air-vent, produce substandard products, finished product rate is not high.Change extruding zone mouth mould into pancake by circle in the operation of present advanced person but for one deck flat-die, improve stretching capability, the film produced like this is ventilative even, and air penetrability is good, and finished product rate is higher, but shortcoming is that the fracture strength of film is not high, and service life is influenced.Therefore, the present inventor is through studying for a long period of time, change existing one deck flat port mould into multilayer flat port mould, what push out like this is the flat die post of multilayer on microcosmic, at the stereoscopic film that the film produced after longitudinal stretching and horizontal expanding operation by calendering is on microcosmic together with multilayer build-up, considerably increase the fracture strength of film; In addition, the present inventor updates technique, make this multilayer flat port be molded standby stereoscopic film and keep good air penetrability while raising fracture strength, the air penetrability obtaining PTFE microporous barrier of the present invention is 4-8 cel, elongation at break is 150-180%, and average pore size is 0.2-2.5 micron.
In addition, PTFE film material will play its superior performance as filtering material simultaneously, and the surface that must be attached to filtering substrate uses.And PTFE film limitation table surface tension prepared by conventional method is little, surface energy is low, and inertia is comparatively large, is difficult to bonding with other material and bond afterwards that firmness is little.The present invention improves the bonding ability of PTFE film and other material, carries out plasma treatment to three-dimensional PTFE film, forms tiny projection, improve surface-active while the joint knot opening film increases Air permenbility on the surface of film, promotes and the laminating fastness of base material.Plasma technique has simply, fast, technique dry method, modification only relates to material surface and does not affect the advantage such as body construction and performance, be utilize plasma to produce various active particles as ion, electronics, free radical, excited atom and molecule process material surface, transferring energy when principle is high-energy particle bombardment material surface in plasma, its energy is generally more than C-C, C-F or other bond energy containing C key, thus interaction that is chemical or physics can be there is with material surface, make C-C, C-F key is opened, a large amount of free radical is produced at material surface.When contacting with nitrogen, form peroxy radical or peroxy-radical rapidly, and can at room temperature long-time stable exist.Because peroxy radical is mainly present in PTFE surface, observe under micrometer microscope, there are many tiny projections on surface, rough surface, for creating conditions with the laminating of Woven glass cloth.If but in plasma technique improper process control, as not high in exciting power or frequency or cause membrane surface process uneven, even can produce top layer and break, and too lowly can not form effective projection amount; In addition, the too small reaction purity that makes of vacuum is not high, cause finally prepd film quality bad, and the too high rear cost of vacuum can increase a lot, and the present inventor is by studying for a long period of time, and regulate the cooperation of plasma technique important parameter, just make microporous barrier be that surface has even tiny projection, these even tiny projections substantially increase the surface adhesive fastness that PTFE film material is attached to filtering substrate.
As preferably, described microporous barrier is that to have density be 30000-50000/square centimeter on surface, and particle diameter is the multilayer film of the projection of 0.1-4 micron.
Another object of the present invention is achieved by the following technical programs: a kind of manufacture method of filtering as claimed in claim 1 with three-dimensional PTFE microporous barrier, and it comprises the following steps successively:
A, batch mixing: polytetrafluoroethylene (PTFE) pulvis mixed with auxiliary agent and stirs, obtaining intermixture;
B, striking adobe: first above-mentioned intermixture to be inserted in baking oven and to infiltrate with size at 40-50 DEG C, then making column base post by pre-shaping device;
C, to extrude: adopt the flat unit of multilayer build-up that above-mentioned column base post flat-die is extruded formation and extrude band sheet material; Described when extruding pressure be 3.5 ~ 4.5MPa, extruded velocity is 1.5 ~ 5m/min, extrudes that to be with sheet material wide be 200 ~ 500mm, and thick is 3.0 ~ 5.0mm;
D, calendering: be with the online pressure of sheet material to be 20 ~ 25 kilograms per centimeter above-mentioned extruding, linear velocity is press and smooth under the pressure roller effect of 1.5 ~ 5m/min to make the broadband that thickness is 400 ~ 700 microns.
E, longitudinal stretching: above-mentioned broadband longitudinal stretching at the temperature of 150 ~ 250 DEG C is obtained longitudinal base band;
F, horizontal expanding: first by above-mentioned longitudinal base band horizontal expanding transversely web at 150 ~ 350 DEG C of temperature, then by described horizontal web curing molding at 340 ~ 370 DEG C, obtained PTFE film base;
G, surface modification: first above-mentioned PTFE film base is placed in acetone soln and embathes surface contaminant, cleaner by washed with de-ionized water, then enter in plasma generator after drying in a vacuum and carry out surface modification treatment, obtain finished film.
As preferably, auxiliary agent described in step a is the mixture of emulsifying agent, coupling agent, adhesive and water; The weight ratio of described auxiliary agent and described polytetrafluoroethylene (PTFE) pulvis is 1:0.25.
As preferably, size described in step b is paraffin or kerosene; The weight ratio of described size and described polytetrafluoroethylene (PTFE) pulvis is 1:1.25.
As preferably, the time infiltrated described in step b is 11-14 hour.
As preferably, in step b, pre-shaping device makes the temperature of column base post is 40 DEG C.
As preferably, in step f, the time of curing molding is 40-60 second.
As preferably, embathe and adopt ultrasonic embathing in step g in acetone soln, in step g, washed with de-ionized water adopts ultrasonic cleaning.Ultrasonic embathing can be more efficient, cleans cleaner.
As preferably, be filled with the nitrogen that purity is greater than 99% in plasma generator described in step g, and to control its pressure be 1.8-2.2Pa, exciting power is 80-120W, frequency 13.30-14.60MHz, and vacuum is 65-75Pa.
The preparation method of the three-dimensional PTFE microporous barrier of the present invention is also through the present inventor and studies for a long period of time gained, by the cooperation of each processing step and technological parameter, reaches the effect of three-dimensional PTFE microporous barrier of the present invention.
The invention has the beneficial effects as follows:
1, the present invention changes existing one deck flat port mould into multilayer flat port mould, makes this multilayer flat port be molded standby stereoscopic film and keep good air penetrability while raising fracture strength.
2, the present invention improves the bonding ability of PTFE film and other material, carries out plasma treatment to three-dimensional PTFE film, forms tiny projection, improve surface-active while the joint knot opening film increases Air permenbility on the surface of film, promotes and the laminating fastness of base material.
3, the preparation method of the three-dimensional PTFE microporous barrier of the present invention is also through the present inventor and studies for a long period of time gained, by the cooperation of each processing step and technological parameter, reaches the effect of three-dimensional PTFE microporous barrier of the present invention.
Detailed description of the invention
This specific embodiment is only explanation of the invention; it is not limitation of the present invention; those skilled in the art can make to the present embodiment the amendment not having creative contribution as required after reading this description, as long as but be all subject to the protection of Patent Law in right of the present invention.
Embodiment 1
A kind of manufacture method of filtering with three-dimensional PTFE microporous barrier, polytetrafluoroethylene (PTFE) pulvis is mixed with auxiliary agent and stirs, obtain intermixture, described auxiliary agent is the mixture of emulsifier glycerol, silane coupler, silica adhesive and water, wherein, the weight ratio of described auxiliary agent and described polytetrafluoroethylene (PTFE) pulvis is 1:0.25.Then being inserted by above-mentioned intermixture in baking oven and to infiltrate in paraffin or kerosene 11 hours with size at 40 DEG C, then at 40 DEG C, making column base post by pre-shaping device, wherein, the weight ratio of described size and described polytetrafluoroethylene (PTFE) pulvis is 1:1.25.Then, adopt the flat unit of multilayer build-up that above-mentioned column base post flat-die is extruded formation and extrude band sheet material, when extruding, pressure is 3.5MPa, and extruded velocity is 1.5m/min, and extruding band sheet material wide is 200mm, and thick is 3.0mm.Be with the online pressure of sheet material to be 20 kilograms per centimeter above-mentioned extruding, linear velocity is press and smooth under the pressure roller effect of 1.5m/min to make the broadband that thickness is 400 m, more above-mentioned broadband longitudinal stretching at the temperature of 150 DEG C is obtained longitudinal base band.Then by above-mentioned longitudinal base band horizontal expanding transversely web at 150 DEG C of temperature, then by described horizontal web curing molding at 340 DEG C, the time of curing molding is 60 seconds, obtained PTFE film base after curing molding; First above-mentioned PTFE film base is placed in acetone soln and embathes surface contaminant, clean by washed with de-ionized water again, then enter in plasma generator after drying in a vacuum and carry out surface modification treatment, obtain finished film, wherein, embathe in acetone soln and adopt ultrasonic embathing, washed with de-ionized water adopts ultrasonic cleaning.Ultrasonic cleaning not only efficient but also cleaning cleaner.In addition, when carrying out surface modification treatment in plasma generator, be filled with at plasma generator the nitrogen that purity is greater than 99%, again the PTFE sample of drying is placed in plasma slab, background pressure 1.8Pa, controls nitrogen flow with mass flowmenter, discharges after air pressure light is stable, electric discharge is stopped after process certain hour, powered-down being exposed in air by sample is oxidized, wherein, and exciting power 80W, frequency 13.30MHz, vacuum is 65Pa.
Embodiment 2
A kind of manufacture method of filtering with three-dimensional PTFE microporous barrier, mixed with auxiliary agent by polytetrafluoroethylene (PTFE) pulvis and stir, obtaining intermixture, described auxiliary agent is emulsifying agent, coupling agent, adhesive and water, wherein, the weight ratio of described auxiliary agent and described polytetrafluoroethylene (PTFE) pulvis is 1:0.25.Then being inserted by above-mentioned intermixture in baking oven and infiltrate 12 hours with size paraffin or kerosene at 45 DEG C, then at 40 DEG C, making column base post by pre-shaping device, wherein, the weight ratio of described size and described polytetrafluoroethylene (PTFE) pulvis is 1:1.25.Adopt the flat unit of multilayer build-up that above-mentioned column base post flat-die is extruded formation and extrude band sheet material; Described when extruding pressure be 4.0MPa, extruded velocity is 3.0m/min, and extruding band sheet material wide is 250mm, and thick is 4.0mm.Be with the online pressure of sheet material to be 22 kilograms per centimeter above-mentioned extruding, linear velocity is press and smooth under the pressure roller effect of 3m/min to make the broadband that thickness is 550 microns.Above-mentioned broadband longitudinal stretching at the temperature of 200 DEG C is obtained longitudinal base band.Then by above-mentioned longitudinal base band horizontal expanding transversely web at 220 DEG C of temperature, then by described horizontal web curing molding at 355 DEG C, the time of curing molding is 50 seconds, obtained PTFE film base after curing molding; First above-mentioned PTFE film base is placed in acetone soln and embathes surface contaminant, cleaner by washed with de-ionized water, then enter in plasma generator after drying in a vacuum and carry out surface modification treatment, obtain finished film; Wherein, embathe and adopt ultrasonic embathing in acetone soln, washed with de-ionized water adopts ultrasonic cleaning.Ultrasonic cleaning not only efficient but also cleaning cleaner.When carrying out surface modification treatment in plasma generator, the nitrogen that purity is greater than 99% is filled with at plasma generator, the PTFE sample of drying is placed in plasma slab, background pressure 2.0Pa, nitrogen flow is controlled with mass flowmenter, discharge after air pressure light is stable, stop electric discharge after process certain hour, powered-down being exposed in air by sample is oxidized.Exciting power 100W, frequency 13.77MHz, vacuum is 70Pa.
Embodiment 3
A kind of manufacture method of filtering with three-dimensional PTFE microporous barrier, polytetrafluoroethylene (PTFE) pulvis mixed with auxiliary agent and stirs, obtaining intermixture, wherein, described auxiliary agent is emulsifying agent, coupling agent, adhesive and water, and the weight ratio of described auxiliary agent and described polytetrafluoroethylene (PTFE) pulvis is 1:0.25.Then above-mentioned intermixture to be inserted in baking oven and infiltrate 14 hours with size paraffin or kerosene at 50 DEG C, then at 40 DEG C, making column base post by pre-shaping device; The weight ratio of described size and described polytetrafluoroethylene (PTFE) pulvis is 1:1.25.Adopt the flat unit of multilayer build-up that above-mentioned column base post flat-die is extruded formation and extrude band sheet material; Described when extruding pressure be 4.5MPa, extruded velocity is 5m/min, and extruding band sheet material wide is 500mm, and thick is 5.0mm.Be with the online pressure of sheet material to be 25 kilograms per centimeter above-mentioned extruding, linear velocity is press and smooth under the pressure roller effect of 5m/min to make the broadband that thickness is 700 microns.Above-mentioned broadband longitudinal stretching at the temperature of 250 DEG C is obtained longitudinal base band.Then by above-mentioned longitudinal base band horizontal expanding transversely web at 350 DEG C of temperature, then by described horizontal web curing molding at 340 DEG C ~ 370 DEG C, the time of curing molding is 60 seconds, obtained PTFE film base after curing molding; First above-mentioned PTFE film base is placed in acetone soln and embathes surface contaminant, cleaner by washed with de-ionized water, then enter in plasma generator after drying in a vacuum and carry out surface modification treatment, obtain finished film.Wherein, embathe and adopt ultrasonic embathing in acetone soln, washed with de-ionized water adopts ultrasonic cleaning.Ultrasonic cleaning not only efficient but also cleaning cleaner.In addition, when carrying out surface modification treatment in plasma generator, the nitrogen that purity is greater than 99% is filled with at plasma generator, the PTFE sample of drying is placed in plasma slab, background pressure 2.2Pa, controls nitrogen flow with mass flowmenter, discharges after air pressure light is stable, stop electric discharge after process certain hour, powered-down being exposed in air by sample is oxidized.Exciting power 120W, frequency 14.60MHz, vacuum is 75Pa.
Comparative example 1
Be the Technology design comparative example that 101920559A (201-12-22) instructs according to patent publication No..A kind of preparation method of polytetrafluoroethylene film, it is characterized in that comprising the following steps: (1) batch mixing: by teflon resin powder and fluid lubricant by weight being 1:(0.2 ~ 0.28) be mixed evenly, 10 ~ 16 hours are left standstill at the temperature of 40 DEG C ~ 80 DEG C, make toner and fluid lubricant mixing, form polytetrafluoroethylene (PTFE) material; (2) pressed compact and calendering: described polytetrafluoroethylene (PTFE) material is pressed into cylindrical blank at 30 DEG C ~ 50 DEG C on harder, blank is extruded club by pushing machine at the temperature of 40 DEG C ~ 60 DEG C, then at 40 DEG C ~ 60 DEG C, is rolled into polytetrafluoroethylene (PTFE) base band through calender; (3) longitudinal stretching: by described polytetrafluoroethylene (PTFE) base band longitudinal stretching in 180 DEG C ~ 300 DEG C baking ovens, obtains degreasing base band; (4) cross directional stretch and thermal finalization: by described degreasing base band cross directional stretch at 180 DEG C ~ 210 DEG C, then 250 DEG C ~ 380 DEG C sintering sizings, sintering time 20 ~ 80 seconds, obtains heat-setting thin-film; (5) cool water shower: by described heat-setting thin-film spraying cooling water, obtains the polytetrafluoro microporous membrane that the weighed property of horizontal and vertical size is good.
Elongation at break, film surface average pore size, air penetrability detection are carried out to the PTFE film that above-described embodiment and comparative example obtain, elongation at break of the present invention detects by GB7689 regulation, air penetrability of the present invention detects by the regulation of GB/T5453-1997, and concrete test result is shown in Table 1:
Table 1 embodiment and comparative example experimental results
Detect data from table 1, the embodiment of the present invention manufactures PTFE film on air penetrability and elongation at break far away higher than comparative example; In addition, the film surface average pore size of comparative example does not almost have, and cannot measure.Illustrate that PTFE film prepared by the embodiment of the present invention not only has good fracture strength and has good air penetrability.
Claims (8)
1. filter the manufacture method with three-dimensional PTFE microporous barrier, it is characterized in that: described PTFE microporous barrier is multilayer film; The air penetrability of described PTFE microporous barrier is 4-8 cel, and elongation at break is 150-180%, and average pore size is 0.2-2.5 micron;
Described microporous barrier is that to have density be 30000-50000/square centimeter on surface, and particle diameter is the multilayer film of the projection of 0.1-4 micron;
Its preparation method comprises the following steps successively:
A, batch mixing: polytetrafluoroethylene (PTFE) pulvis mixed with auxiliary agent and stirs, obtaining intermixture;
B, striking adobe: first above-mentioned intermixture to be inserted in baking oven and to infiltrate with size at 40-50 DEG C, then making column base post by pre-shaping device;
C, to extrude: adopt the flat unit of multilayer build-up that above-mentioned column base post flat-die is extruded formation and extrude band sheet material; Described when extruding pressure be 3.5 ~ 4.5MPa, extruded velocity is 1.5 ~ 5.0m/min, extrudes that to be with sheet material wide be 200 ~ 500mm, and thick is 3.0 ~ 5.0mm;
D, calendering: be with the online pressure of sheet material to be 20 ~ 25 kilograms per centimeter above-mentioned extruding, linear velocity is press and smooth under the pressure roller effect of 1.5 ~ 5m/min to make the broadband that thickness is 400 ~ 700 microns;
E, longitudinal stretching: above-mentioned broadband longitudinal stretching at the temperature of 150 ~ 250 DEG C is obtained longitudinal base band;
F, horizontal expanding: first by above-mentioned longitudinal base band horizontal expanding transversely web at 150 ~ 350 DEG C of temperature, then by described horizontal web curing molding at 340 ~ 370 DEG C, obtained PTFE film base;
G, surface modification: first above-mentioned PTFE film base is placed in acetone soln and embathes surface contaminant, cleaner by washed with de-ionized water, then enter in plasma generator after drying in a vacuum and carry out surface modification treatment, obtain finished film.
2. a kind of manufacture method of filtering with three-dimensional PTFE microporous barrier as claimed in claim 1, is characterized in that: auxiliary agent described in step a is the mixture of emulsifying agent, coupling agent, adhesive and water; The weight ratio of described auxiliary agent and described polytetrafluoroethylene (PTFE) pulvis is 1:0.25.
3. a kind of manufacture method of filtering with three-dimensional PTFE microporous barrier as claimed in claim 2, is characterized in that: size described in step b is paraffin or kerosene; The weight ratio of described size and described polytetrafluoroethylene (PTFE) pulvis is 1:1.25.
4. a kind of manufacture method of filtering with three-dimensional PTFE microporous barrier as claimed in claim 3, is characterized in that: the time infiltrated described in step b is 11-14 hour.
5. a kind of manufacture method of filtering with three-dimensional PTFE microporous barrier as claimed in claim 4, is characterized in that: in step b, pre-shaping device makes the temperature of column base post is 40 DEG C.
6. a kind of manufacture method of filtering with three-dimensional PTFE microporous barrier as claimed in claim 5, is characterized in that: in step f, the time of curing molding is 40-60 second.
7. a kind of manufacture method of filtering with three-dimensional PTFE microporous barrier as claimed in claim 6, is characterized in that: embathe in acetone soln in step g and adopt ultrasonic embathing; In step g, washed with de-ionized water adopts ultrasonic cleaning.
8. a kind of manufacture method of filtering with three-dimensional PTFE microporous barrier as claimed in claim 7, it is characterized in that: in plasma generator described in step g, be filled with the nitrogen that purity is greater than 99%, and to control its pressure be 1.8-2.2Pa, exciting power is 80-120W, frequency 13.30-14.60MHz, vacuum is 65-75Pa.
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| CN107277701A (en) * | 2017-08-12 | 2017-10-20 | 施柏德（厦门）科技有限公司 | A kind of preparation method of the waterproof and breathable sound passing membrane compound by lamination |
| CN108568220B (en) * | 2018-04-26 | 2021-06-04 | 杭州科百特过滤器材有限公司 | Preparation method of polytetrafluoroethylene nano-filtration membrane |
| CN111361171A (en) * | 2019-11-19 | 2020-07-03 | 南京玻璃纤维研究设计院有限公司 | Preparation method of asymmetric structure film |
| CN111077292B (en) * | 2019-12-23 | 2022-03-29 | 上海微谱化工技术服务有限公司 | Pretreatment method for analysis of artificial leather material for vehicle |
| CN113043632B (en) * | 2021-03-09 | 2022-08-02 | 山东森荣新材料股份有限公司 | Preparation method of polytetrafluoroethylene high-strength microporous membrane |
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| CN102303407A (en) * | 2011-09-16 | 2012-01-04 | 中国人民解放军总后勤部军需装备研究所 | Equipment and method for preparing polytetrafluoroethylene (PTFE) membrane by three-dimensional (3D) stretching |
| CN202700236U (en) * | 2012-08-01 | 2013-01-30 | 上海市凌桥环保设备厂有限公司 | Polytetrafluoroethylene microporous membrane for purifying particle matters (PM) 2.5 |
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| US7501003B2 (en) * | 2004-03-02 | 2009-03-10 | Gore Enterprise Holdings | Composite filter media |
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| EP0437721A1 (en) * | 1989-12-07 | 1991-07-24 | Daikin Industries, Limited | Process for producing multilayer polytetrafluoroethylene porous membrane and semisintered polytetrafluoroethylene multilayer structure |
| CN101920559A (en) * | 2010-06-09 | 2010-12-22 | 浙江格尔泰斯环保特材科技有限公司 | Preparation method and product of polytetrafluoroethylene (PTFE) film |
| CN102303407A (en) * | 2011-09-16 | 2012-01-04 | 中国人民解放军总后勤部军需装备研究所 | Equipment and method for preparing polytetrafluoroethylene (PTFE) membrane by three-dimensional (3D) stretching |
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Address after: Zhejiang anjifeng Huzhou Glass Industry Co., Ltd Patentee after: Zhejiang Shengfeng Filtration Technology Co.,Ltd. Address before: Zhejiang anjifeng Huzhou Glass Industry Co., Ltd Patentee before: ANJI SHENGFENG FIBERGLASS Co.,Ltd. |