CN101879419B - Multilayer polytetrafluoroethylene membrane as well as preparation method and device thereof - Google Patents
Multilayer polytetrafluoroethylene membrane as well as preparation method and device thereof Download PDFInfo
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Abstract
The invention provides a multilayer polytetrafluoroethylene membrane with higher strength and small bore diameter as a preparation method and a device thereof. The bore diameter of the polytetrafluoroethylene membrane is less than 1 mu m, and the elongation at break is 50-200%. The preparation method comprises the following steps of: after respectively heating and degreasing more than two single-layer polytetrafluoroethylene membranes at 50-150 DEG C and carrying out wet stretching on the single-layer polytetrafluoroethylene membranes 1-6 times, laminating the single-layer polytetrafluoroethylene membranes together in a line to pass through a guiding roll set, and then drying the laminated single-layer polytetrafluoroethylene membranes at 150-280 DEG C to cleanly degrease when passing through the guiding roll set; then stretching 5-18 times at the temperature of 180-300 DEG C by a longitudinal pull roll set to form a longitudinal pull strip; and after transversely stretching the longitudinal pull strip by using an expander set, sintering and sizing the stretched longitudinal pull strip at the sintering temperature of 280-500 DEG C to obtain the multilayer polytetrafluoroethylene membrane.
Description
Affiliated field
The invention belongs to the processing and manufacturing technical field of polytetrafluoroethylene (PTFE) miillpore filter, relate in particular to the preparation of welding the multilayer polytetrafluoroethylarticles film in fastness and aperture between key-course, is the manufacturing field of air filtration film, clothes film and water filtration poly tetrafluoroethylene.
Background technology
For the expanded polytetrafluoroethylsealing miillpore filter; Majority is the film of individual layer on the market; Its manufacturing process is following: at first the expanded polytetrafluoroethylsealing powder is proportioned into the paste shape with proper auxiliary agent oil; Process cylindrical blank through blank shaper, that puts that the machine of pushing is extruded into certain diameter under certain pressure cylindricly gets into calender through guider and is pressed into calendared sheet, then through vertically draw, expanding forms the planar structure that the expanded microporous polytetra fluoroethylene-EPTEE film is bidimensional.The characteristics of the polytetrafluoroethylene (PTFE) miillpore filter of weaving out like this are that intensity is lower, the aperture is bigger, are difficult to control the mechanical strength of film and the size in aperture, thereby have limited its application.National increasingly high to environmental protection requirement at present, polytetrafluoroethylene film is as a surface filtration material, and in order to improve filter efficiency and service life, more and more littler to its aperture requirement, mechanical strength is also increasingly high; In apparel industry, people pursue the comfortable of dress, and open in the market of " breathing " garment material, and used polytetrafluoroethylene (PTFE) miillpore filter has thermal insulating and water-proof and passes through wet specification requirement, need strict control its aperture, mechanical strength and watertight requirement; In water filtration, need the aperture and the intensity of control polytetrafluoroethylene (PTFE) miillpore filter equally, the polytetrafluoroethylene (PTFE) miillpore filter of similar bidimensional originally can not satisfy present requirement.
Summary of the invention
The preparation method who the purpose of this invention is to provide the multilayer polytetrafluoroethylarticles film that a kind of intensity is higher, the aperture is little.
Multilayer polytetrafluoroethylarticles membrane preparation method of the present invention; Be with plural individual layer poly tetrafluoroethylene respectively after 50～150 ℃ of down heating degreasings, 1～6 times of wet stretching; Consistency from top to bottom is superimposed together through the guide roller group, and is dry down clean the grease disengaging at 150～280 ℃ during through the guide roller group; Again through under 180～300 ℃ of the temperature, form vertical drawstring after the stretching of 5～18 times vertical withdrawing roll group; Vertical drawstring through the expanding unit by cross directional stretch after, obtain the multilayer polytetrafluoroethylarticles film in 280～500 ℃ of following sintering typings of sintering temperature.
Temperature control before wet the stretching is extremely important, and it is determining, and the weld strength between layer and the layer, every layer cortex form, the pore size of telolemma, and the selection temperature range is 50～150 ℃; The wet stretching ratio that stretches is determining the pore size of telolemma, the formation of every layer of cortex to combine intensity of force with performance, interlayer, and the selection draw ratio that wets is 1～6 times.The guide roller group plays dry grease, remove fully totally, and its baking temperature is 150～280 ℃; The stretching ratio of vertical withdrawing roll group and the wet multiplying power product that stretches play crucial effects to the character of film, and the draft temperature here is quite important, 5～18 times of the stretching ratios of vertical withdrawing roll group 10, and the temperature range of stretching is 180～300 ℃;
Sintering temperature is determining aperture, the mechanical strength of polytetrafluoroethylene (PTFE) miillpore filter, the size and the distributing homogeneity of thickness, and sintering temperature is 280～500 ℃.
Utilize interlayer adhesion, the mechanical strength of the polytetrafluoroethylene (PTFE) miillpore filter that this method produces to control, the aperture of micropore also can be controlled, with the micropore size that is far smaller than the individual layer poly tetrafluoroethylene.Multilayer polytetrafluoroethylarticles film (finished film) aperture that makes with said method is less than 1 μ m, elongation at break (50-200) %.
Above-mentioned method, vertical drawstring is by cross directional stretch through the expanding unit under 1～30 meter/minute condition in 120～360 ℃ of temperature, 7～45 ° at expanding angle, draw line speed.Expanding angle, expanding speed (draw line speed) are also relevant with the size and the distributing homogeneity of the aperture of polytetrafluoroethylene (PTFE) miillpore filter, mechanical strength, thickness, and wherein the scope of expanding angle (angle) is that 7～45 °, draw line speed are that 1～30 meter/minute, sintering temperature are 280～500 ℃.
Above-mentioned method, individual layer poly tetrafluoroethylene form in the process of indulging drawstring and vertical drawstring forms in the process of multilayer polytetrafluoroethylarticles film, and vertical drawstring all is that the permanent linear speed of permanent tension force moves.Preferably flatten through spreading roll through the vertical drawstring after the vertical withdrawing roll group.
The present invention provides the preparation facilities of the multilayer polytetrafluoroethylarticles film that a kind of intensity is higher, the aperture is little simultaneously, and it comprises vertical machine drawing group and expanding unit; Vertical machine drawing group comprises plural vertical unwinding device and the wet draw roll group of drawing, a guide roller group, a vertical withdrawing roll group, the vertical wrap-up, degreasing heating furnace of drawing; Wet draw roll group, guide roller group, vertical withdrawing roll group are all in the degreasing heating furnace; Through vertical draw two (layer) that unwinding device emits or above individual layer poly tetrafluoroethylene to get into the degreasing heating furnace after, earlier through after the wet draw roll group again consistency from top to bottom be superimposed together and drawn wrap-up to reel to obtain indulging drawstring by vertical through guide roller group, vertical withdrawing roll group; The expanding unit comprises the expanding unwinding device, has the horizontal section of drawing at 7～45 ° of expanding angles, land, outlet section, expanding wrap-up; Vertical drawstring one side of emitting through the expanding unwinding device is obtained the multilayer polytetrafluoroethylarticles film through the horizontal section of drawing, land, outlet section by expanding wrap-up coiling.
Above-mentioned preparation facilities, vertical unwinding device, the expanding unwinding device of drawing all is the permanent linear speed unwinding devices of permanent tension force; Vertical wrap-up, the expanding wrap-up of drawing all is the permanent linear speed wrap-ups of permanent tension force.Be preferably in vertical withdrawing roll group and indulge to draw and be provided with the pendulum roller that is used to control vertical drawstring tension force between the wrap-up; Preferably between vertical withdrawing roll group and pendulum roller, be provided with spreading roll.
Above-mentioned preparation facilities is provided with the pendulum roller that is used to control vertical drawstring tension force vertical drawing between unwinding device and the wet draw roll group; Preferably between pendulum roller and wet draw roll group, be provided with spreading roll.
The present invention provides the multilayer polytetrafluoroethylarticles that a kind of intensity is higher, the aperture is little film simultaneously; Its aperture is less than 1 μ m; Elongation at break (50-200) %.
The present invention provides the expanded polytetrafluoroethylsealing miillpore filter " welding " of a multilayer to become the production technology and the equipment of the high-intensity film in small-bore of a three-dimensional shape together; Utilize interlayer adhesion, the mechanical strength of the multilayer polytetrafluoroethylarticles miillpore filter that this method produces to control; The aperture of micropore also can be controlled, with the micropore size that is far smaller than the individual layer poly tetrafluoroethylene.
Description of drawings
Fig. 1 is that the vertical machine drawing group of this patent is at the user mode sketch map.
Fig. 2 is that the expanding unit of this patent is at the user mode sketch map.
The specific embodiment
Referring to Fig. 1, Fig. 2; Be will be according to the granularity of the concrete specification requirement manufacturing thickness of polytetrafluoroethylene (PTFE) miillpore filter, width, oil-containing, expanded polytetrafluoroethylsealing powder and polytetrafluoroethylene (PTFE) calendering band (the individual layer poly tetrafluoroethylene) 1 (referring to Fig. 1) of molecular weight and all standard compliant three volumes of compression ratio, what be placed on aligning the upper and lower that the permanent tension force of multireel, permanent linear speed initiatively unreels vertically draws the unreeling on the arbor of unwinding device.These calenderings with 1 through the dancing roller or put roller 2 control calendering with on the tension force that born, through spreading roll 3 these calendering bands are flattened under the prerequisite of destructive characteristics not again, get into degreasing heating furnace 5 simultaneously.The degreasing heating furnace is divided into two large divisions 51,52.Have electrical heating elements 4, guide roller 7, wet draw roll group 8 in the right portions 51, guide roller group 9 is used for the degreasing of calendering band, wet drawing-off.Have electrical heating elements 4, vertical withdrawing roll group 10 in the left part 52.Grease will take off totally basically before the calendering band gets into left part 52; Getting into left part 52 then indulges and draws; Process " one deck " of being superimposed together vertical drawstring (being the vertical drawstring that three layers of individual layer poly tetrafluoroethylene are bonded together on the actual microcosmic), the bond strength between layer and the layer can be controlled.
Electrical heating elements 4 heats, and certainly, the thermal source of degreasing heating furnace also can be a hot blast etc.; In order to prevent that grease from catching fire, the grease vapors in the stove must be discharged through chimney 6.In order to prevent the pollution of the environment, can utilize condenser to reclaim grease vapors, utilize or adopt other ways processing after the cleaning again.
Polytetrafluoroethylene (PTFE) calendering with 1 degreasing heating furnace 5 in before the guide roller 7 in this space can through the height of control temperature control roll with 1 in the amount of removing of grease; Temperature range is 50～150 ℃, thereby reaches the bonding strength of microstructure interlayer between the vertical drawstring of control final " one deck ".1 stretching of wetting is with in the calendering of wet 8 pairs of feedings of draw roll group, and the multiplying power of stretching is stepless adjustable, and draw ratio is 1～6 times; With wet draw roll group 8 is the linear velocity and the tension variation of the vertical machine drawing group of main order control whole piece.Vertical drawstring after drafted carries out degreasing via guide roller 9, is combined into " one deck " and grease is removed totally at the multilayer of this a part of drafted mistake calendering band, reaches to indulge dragline and stretch required temperature; The de-oiling temperature depends on the output of unit, and temperature range is 150～280 ℃.
Be superimposed together and be removed the left part 52 that the vertical drawstring of grease gets into the degreasing heating furnace, here its to required multiple, finally becoming can be at the vertical drawstring 14 that meets specification requirement of later process expanding by 5～18 times of vertical withdrawing roll group 10 drawing-offs.The temperature range that vertical withdrawing roll group 10 stretches is 180～300 ℃, depends on the output of vertical machine drawing group equally; Drawn good vertical drawstring 14 and come out of the stove, flattened by spreading roll 12 then, perhaps put the size of tension force on the vertical drawstring 14 of roller 13 controls through the dancing roller through guide roller 11.Vertical drawstring 14 is wound on vertical drawing in the rotating shaft of wrap-up.The dancing roller is perhaps put the tension force that roller 13 is being controlled this section, and the vertical wrap-up that draws is the permanent linear speed rolling of permanent tension force, and they serve as that main the order carried out the tension closed loop FEEDBACK CONTROL with wet draw roll group.
The expanding operation in back road is seen Fig. 2.Draw the unreeling on the arbor 21 of width of cloth unwinding device that good vertical drawstring 14 is placed in the permanent tension force of permanent linear speed, carried out preheating, 130～240 ℃ of preheat temperatures by the feeding section 22 of feeding expanding unit then.When vertical drawstring arrives the stretch section 23 of expanding unit by cross directional stretch to required width and thickness; The draft temperature here is 120～360 ℃; The expanding angle here, expanding speed are determining aperture, the mechanical strength of polytetrafluoroethylene (PTFE) miillpore filter, the size and the distributing homogeneity of thickness; Wherein the scope at expanding angle is 7～45 °, and the linear velocity of stretching is 1～30 meter/minute.When the film behind the expanding gets into the sintering land 24 of expanding unit; Finalized the design by high temperature sintering; Wherein sintering temperature is 280～500 ℃; It is determining aperture, the thickness of polytetrafluoroethylene (PTFE) miillpore filter, the size and the distributing homogeneity of mechanical strength equally, is also determining to weld fastness between the microstructure layer between " one deck ".Then film eliminates stress to be come out of the stove by outlet section 26 in the slack strand 25 of expanding unit and is wound into finished product multilayer polytetrafluoroethylarticles film (miillpore filter) by the rolling arbor of the expanding wrap-up of the permanent linear speed of permanent tension force.The aperture of multilayer polytetrafluoroethylarticles film is less than 1 μ m, elongation at break (50-200) %.
Key of the present invention is on the equipment and technology of vertical machine drawing group, and the expanding operation in back road is roughly the same with filming technology in the past, is its key technology in sintering land control sintering temperature just.
Embodiment 1:
Selected expanded polytetrafluoroethylsealing powder molecular weight is 8,000,000, and used finish is an Isopar E type oil; Oil-bound distemper weight ratio 15%; The calendering bandwidth is 260, and thickness is 180 μ m, two-layerly draws altogether.Preheat temperature is 140 ℃ before wet the stretching, wet stretching draw ratio 1: 1.Skimming temp is 220 ℃ after wet the stretching.Draft temperature was 250 ℃ when vertical withdrawing roll group stretched; Final draw ratio is: 1: 9.Vertical drawstring width 170mm, thickness 141.7 μ m.During expanding, feeding fabric width 120mm, expanding exit width 2600mm; 200 ℃ of the feeding section preheat temperatures of expanding unit; 260 ℃ of the draft temperatures of the stretch section of expanding unit, 350 ℃ of the sintering land sintering temperatures of expanding unit, 200 ℃ of lax temperature; 30 ° at expanding angle (track angle), 24 meters/minute of the draw line speed of expanding unit.The finished film thickness 1.2 μ m that make, aperture 0.7583 μ m, elongation at break 130.4%.
Embodiment 2-25:
Embodiment 2-25 referring to table 1; Be respectively with n (layer) individual layer poly tetrafluoroethylene heat degreasing under the different heating skimming temp in table 1 respectively, after the wet stretching of different multiples; Consistency from top to bottom is superimposed together through the guide roller group, and is dry clean the grease disengaging under different working temperatures during through the guide roller group; Again through behind different vertical draft temperatures and vertical draw ratio, forming vertical drawstring; Vertical drawstring passes through the different expanding temperature of expanding unit in table 2, expanding angle, draw line speed again by cross directional stretch; Vertical drawstring through the expanding unit by cross directional stretch after, the sintering typing obtains the multilayer polytetrafluoroethylarticles film under the different sintering temperature in table 2.The individual layer poly tetrafluoroethylene forms in the process of indulging drawstring and vertical drawstring forms in the process of multilayer polytetrafluoroethylarticles film, and vertical drawstring all is that the permanent linear speed of permanent tension force moves.Aperture, the elongation at break of the multilayer polytetrafluoroethylarticles film that embodiment 2-25 obtains are seen table 2.
Table 1:
| Embodiment | The quantity n of individual layer poly tetrafluoroethylene (individual) | The heating skimming temp (℃) | Wet draw ratio | Operating temperature (℃) | Vertical draft temperature (℃) | Vertical draw ratio doubly |
| 2 | 2 | 50 | 1 | 150 | 180 | 5 |
| 3 | 2 | 80 | 3 | 190 | 220 | 9 |
| 4 | 2 | 120 | 5 | 230 | 260 | 13 |
| 5 | 2 | 150 | 6 | 280 | 300 | 18 |
| 6 | 2 | 50 | 1 | 280 | 180 | 5 |
| 7 | 2 | 80 | 3 | 230 | 220 | 9 |
| 8 | 2 | 120 | 5 | 190 | 260 | 13 |
| 9 | 2 | 150 | 6 | 150 | 300 | 18 |
| 10 | 3 | 50 | 3 | 150 | 220 | 5 |
| 11 | 3 | 80 | 1 | 190 | 180 | 9 |
| 12 | 3 | 120 | 6 | 230 | 300 | 13 |
| 13 | 3 | 150 | 5 | 280 | 260 | 18 |
| 14 | 3 | 150 | 1 | 280 | 180 | 5 |
| 15 | 3 | 120 | 3 | 230 | 220 | 9 |
| 16 | 3 | 80 | 5 | 190 | 260 | 13 |
| 17 | 3 | 50 | 6 | 150 | 300 | 18 |
| 18 | 4 | 150 | 3 | 280 | 300 | 5 |
| 19 | 4 | 120 | 1 | 230 | 260 | 9 |
| 20 | 4 | 80 | 6 | 190 | 220 | 13 |
| 21 | 4 | 50 | 5 | 150 | 180 | 18 |
| 22 | 4 | 50 | 1 | 280 | 300 | 5 |
| 23 | 4 | 80 | 3 | 230 | 260 | 9 |
| 24 | 4 | 120 | 5 | 190 | 220 | 13 |
| 25 | 4 | 150 | 6 | 150 | 180 | 18 |
Table 2:
| Embodiment | The expanding temperature (℃) | The expanding angle (°) | Draw line speed is (meter/minute) | Sintering temperature (℃) | Finished film thickness aperture (μ m) | Elongation at break |
| 2 | 360 | 7 | 1 | 280 | 0.72 | 188 |
| 3 | 260 | 15 | 8 | 350 | 0.77 | 151 |
| 4 | 180 | 25 | 16 | 420 | 0.85 | 107 |
| 5 | 120 | 45 | 30 | 500 | 0.96 | 62 |
| 6 | 120 | 45 | 30 | 500 | 0.75 | 77 |
| 7 | 180 | 25 | 16 | 420 | 0.81 | 98 |
| 8 | 260 | 15 | 8 | 350 | 0.87 | 136 |
| 9 | 360 | 7 | 1 | 280 | 0.95 | 171 |
| 10 | 120 | 7 | 1 | 280 | 0.56 | 180 |
| 11 | 180 | 15 | 8 | 350 | 0.50 | 162 |
| 12 | 260 | 25 | 16 | 420 | 0.62 | 171 |
| 13 | 360 | 45 | 30 | 500 | 0.60 | 155 |
| 14 | 120 | 7 | 30 | 500 | 0.45 | 165 |
| 15 | 180 | 15 | 16 | 420 | 0.51 | 171 |
| 16 | 260 | 25 | 8 | 350 | 0.55 | 185 |
| 17 | 360 | 45 | 1 | 280 | 0.59 | 189 |
| 18 | 360 | 7 | 1 | 280 | 0.36 | 161 |
| 19 | 260 | 15 | 8 | 350 | 0.41 | 170 |
| 20 | 180 | 25 | 16 | 420 | 0.43 | 181 |
| 21 | 120 | 45 | 30 | 500 | 0.46 | 197 |
| 22 | 360 | 45 | 30 | 500 | 0.38 | 149 |
| 23 | 260 | 25 | 16 | 420 | 0.40 | 167 |
| 24 | 180 | 15 | 8 | 350 | 0.40 | 172 |
| 25 | 120 | 7 | 1 | 280 | 0.47 | 181 |
Claims (10)
1. multilayer polytetrafluoroethylarticles membrane preparation method; It is characterized in that: with plural individual layer poly tetrafluoroethylene respectively after 50～150 ℃ of down heating degreasings, 1～6 times of wet stretching; Consistency from top to bottom is superimposed together through the guide roller group, and is dry down clean the grease disengaging at 150～280 ℃ during through the guide roller group; Again through under 180～300 ℃ of the temperature, form vertical drawstring after the stretching of 5～18 times vertical withdrawing roll group; Vertical drawstring through the expanding unit by cross directional stretch after, obtain the multilayer polytetrafluoroethylarticles film in 280～500 ℃ of following sintering typings of sintering temperature.
2. the method for claim 1 is characterized in that: vertical drawstring is by cross directional stretch through the expanding unit under 1～30 meter/minute condition in 120～360 ℃ of temperature, 7～45 ° at expanding angle, draw line speed.
3. the method for claim 1 is characterized in that: the individual layer poly tetrafluoroethylene forms in the process of vertical drawstring and vertical drawstring forms in the process of multilayer polytetrafluoroethylarticles film, and vertical drawstring all is that the permanent linear speed of permanent tension force moves.
4. the method for claim 1 is characterized in that: the vertical drawstring through after the vertical withdrawing roll group flattens through spreading roll.
5. multilayer polytetrafluoroethylarticles membrane preparation device is characterized in that:
It comprises vertical machine drawing group and expanding unit;
Vertical machine drawing group comprises plural vertical unwinding device and the wet draw roll group of drawing, a guide roller group, a vertical withdrawing roll group, the vertical wrap-up, degreasing heating furnace of drawing; Wet draw roll group, guide roller group, vertical withdrawing roll group are all in the degreasing heating furnace; After the vertical plural individual layer poly tetrafluoroethylene that draws unwinding device to emit gets into the degreasing heating furnace, earlier through after the wet draw roll group again consistency from top to bottom be superimposed together and drawn wrap-up to reel to obtain vertical drawstring by vertical through guide roller group, vertical withdrawing roll group;
The expanding unit comprises the expanding unwinding device, has the horizontal section of drawing at 7～45 ° of expanding angles, land, outlet section, expanding wrap-up; Vertical drawstring one side of emitting through the expanding unwinding device is obtained the multilayer polytetrafluoroethylarticles film through the horizontal section of drawing, land, outlet section by expanding wrap-up coiling.
6. preparation facilities as claimed in claim 5 is characterized in that: vertical unwinding device, the expanding unwinding device of drawing all is the permanent linear speed unwinding devices of permanent tension force; Vertical wrap-up, the expanding wrap-up of drawing all is the permanent linear speed wrap-ups of permanent tension force.
7. preparation facilities as claimed in claim 6 is characterized in that: be provided with the pendulum roller that is used to control vertical drawstring tension force between the wrap-up in vertical withdrawing roll group and vertical drawing.
8. preparation facilities as claimed in claim 7 is characterized in that: between vertical withdrawing roll group and pendulum roller, be provided with spreading roll.
9. preparation facilities as claimed in claim 6 is characterized in that: be provided with the pendulum roller that is used to control vertical drawstring tension force between unwinding device and the wet draw roll group vertical drawing.
10. multilayer polytetrafluoroethylarticles film is characterized in that: it is to adopt the described method of claim 1 to make; Its aperture is less than 1 μ m; Elongation at break (50-200) %.
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| JP2012176361A (en) * | 2011-02-25 | 2012-09-13 | Sumitomo Electric Fine Polymer Inc | Porous multilayered filter |
| CN102173354A (en) * | 2011-03-09 | 2011-09-07 | 中材科技股份有限公司 | Polytetrafluoroethylene film longitudinal stretching unit |
| CN102926159B (en) * | 2012-10-27 | 2014-05-07 | 广东小太阳砂磨材料有限公司 | Sizing process and production equipment for polyester-containing base fabric of sandcloth |
| CN104258636B (en) * | 2014-05-19 | 2016-08-24 | 中材科技股份有限公司 | A kind of air purification filter material and preparation method thereof |
| CN105983352B (en) * | 2015-02-16 | 2018-05-15 | 上海灵氟隆新材料科技有限公司 | A kind of high throughput thicker polytetrafluoroethylene film and preparation method thereof |
| CN108905638B (en) * | 2018-06-27 | 2020-06-19 | 中材科技股份有限公司 | Preparation method of efficient membrane filtering material |
| CN109758913A (en) * | 2019-03-08 | 2019-05-17 | 南京骏涛机械设备有限公司 | A kind of laminated-type microporous barrier, laminated-type micropore membrane producing device and manufacturing method |
| CN112044278A (en) * | 2020-09-14 | 2020-12-08 | 浙江格尔泰斯环保特材科技股份有限公司 | Preparation method of PTFE microporous membrane with multilayer structure |
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| JP3795027B2 (en) * | 2003-04-02 | 2006-07-12 | 宇明泰化工股▲ふん▼有限公司 | Asymmetric porous polytetrafluoroethylene membrane for filters |
| CN101007242A (en) * | 2006-12-27 | 2007-08-01 | 中材科技股份有限公司 | Preparation method of expanding microporous poly tetrafluoroethylene |
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Effective date of registration: 20200213 Address after: 210000 No.30, Andri, Yuhua West Road, Nanjing, Jiangsu Province Patentee after: Nanjing Glass Fibre Research and Design Institute company limited Address before: Jiangning District of Nanjing City, Jiangsu province 211100 Jiangning Science Park Tong Road No. 99 Patentee before: Sinoma Science & Technology Co.,Ltd. |