CN100447317C - Method for preparing expanded polytetrafluoroethylene fiber for exhaust decomposition - Google Patents
Method for preparing expanded polytetrafluoroethylene fiber for exhaust decomposition Download PDFInfo
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Abstract
The invention discloses varicosity polytetrafluoroethylene fiber manufacturing method used in waste gas decomposition. It includes the following steps: mixing varicosity polytetrafluoroethylene resin, waste gas catalyst powder, with lubricant; sieving; ageing; compacting; spinning; degreasing; drawing; and hot forming. The produced fiber has multi-microcellular structure which can decompose the waste gas while passing, good quality, can be widely used in filtering material. Compared with the existing technique, the invention has the advantages of simple technology, low cost, no pollution etc.
Description
Technical field
The present invention relates to the preparation method of polytetrafluoroethylene fibre, be specifically related to the method that extruding spinning method preparation with lubricator is used for the expanded polytetrafluoroethylfiber fiber of waste gas decomposition.
Background technology
Polytetrafluoroethylene fibre, China is commonly called as and is " teflon " or " special teflon ", and function admirables such as it is heat-resisting, resistance to chemical attack are powerful high, are widely used in a plurality of industrial circles.Polytetrafluoroethylene fibre separately or itself and the high temperature resistant filter felt of dedusting that can be processed into frequent use such as power plant, Metallurgical Factory, cement plant after glass fibre mixes.Wherein polytetrafluoroethylene fibre and the filter felt of making after glass fibre mixes can provide the filtering surface than the bigger efficient of pure teflon Nomex of identical weight; Simultaneously, in the filter process, triboelectrification occurs between glass and the teflon fiber, thereby can improve the separative efficiency to powder dust particle in the sub-micrometer range greatly, is used in a large number at separation field.
Polytetrafluoroethylene (PTFE) viscosity when high temperature is big, does not flow, and also is insoluble to all kinds of solvents, can not adopt the method processing of traditional melt spinning and wet spinning.At present, the most commonly used in the world and preparation method comparatively ripe polytetrafluoroethylene fibre has milk thread, splits the film spinning, lubricant extruding spinning (or being called the paste extruded method) (Miu Jingyuan, leaf is herded, fluoroplastics processing and application, Beijing: Chemical Industry Press, 1987,94; Luo Yifeng, the preparation of fluorofibre, characteristic and application, tec fiber and application, 1999,24 (5), 21-24; Wei Zheng, the production of teflon fiber, performance and application, the Shaanxi weaving, 2002, (53), 43-45).
Milk thread is a carrier with viscose glue or polyvinyl alcohol normally, carry out fully mixed with polytetrafluorethylepowder powder or polytetrafluoroethylene (PTFE) dispersion emulsion, to mix liquid with measuring pump and carry out wet spinning through squeezing into spinneret behind the filter, spinneret is placed in the coagulating baths such as sodium sulphate, mixed liquid through spinneret is condensed into fiber in coagulating bath, make fiber through the drip washing of drip washing roller soft water then, distinguish oiling roller and dryer roll again, remove polyvinyl alcohol through behind the high temperature sintering, last drawn is made polytetrafluoroethylene fibre.
Described in United States Patent (USP) 5364699,5288552,5281475,5591526, the initiation material that splits the film spinning is polytetrafluoroethylene film or fine and close sintering cylinder, be cut into behind the faciola silk at the above sintering of fusing point (327 ℃), polytetrafluoroethylene fibre is made in drawn and heat treatment again.This method mainly is to adopt crush cutting to become to reburn behind the slice technology such as knot stretchings, and present existing crush cutting equipment still can not switch to material very thin level, therefore causes final fiber thicker, is unfavorable for use.
The lubricant extruding spinning is with polytetrafluorethylepowder powder and certain volatile substances furnishing pastel, then from spinning head extrusion spinning, makes volatile substances volatilization, and high elongation at high temperature obtains heterogeneous white tape yarn then.What have then is extrusion film or slice in extrusion device, through the pressure rolling operation, removes auxiliary agent.Without the molecularly oriented and the polytetrafluoroethylene film of arrangement that condenses, again through after the vertical cutting processing in road, also must stretch, fluffy processing.People such as smith (United States Patent (USP) 2776465) disclose height-oriented tetrafluoroethylene profiled piece and production method thereof.People such as Smith disclose the PTFE fiber and have been obtained by the paste-extruded PTFE adoption compound monofilament that forms by stretching, and this PTFE monofilament is by paste-extruded formation the after heat-treating under the temperature of the crystalline melt point that is higher than PTFE, has made the fiber of 2.4g/d (0.19GPa).Clear water just pure (Chinese patent ZL95107309.5) further discloses the free end annealing of monofilament and stretching condition subsequently on this basis, has made intensity and has been the high strength PTFE fiber of 0.5Gpa at least.
Adopt the expanded PTFE resin can process microporous polytetrafluoroethylene fibre, produce general employing of this fibrid and split film spinning and lubricant extruding spinning, and milk thread generally is used to produce the dense form fiber.The fiber multi-cellular structure helps gas flowing betwixt, and fiber can be that long filament also can short fiber, can further be processed into woven cloth and also can be used for Nomex, therefore is widely used in the filtration industry.Katayama (United States Patent (USP) 5061561) discloses yarn goods and the production method thereof that comprises the varicosity tetrafluoro ethylene polymer.The TENSILE STRENGTH (the 5th hurdle, 28-32 is capable) in the scope of 4-8g/d (0.35-0.7GPa) of the expanded polytetrafluoroethylfiber fiber that Katayama introduces.This fiber is by stretching under the temperature of varicosity TFE crystalline solid fusing point, thereby forms the porous fibre of fibril-node structure.
Along with the fast development of countries in the world modern industrialization process, atmosphere pollution has become a serious day by day global problem, and exhaust gas discharging such as dioxin, furans, nitrogen oxide, sulfide and control obtain the attention of countries in the world.Active carbon adsorption is common processing both at home and abroad at present, though have good removal efficient, activated carbon meeting inactivation used for a long time.For dioxin gas, just the gas phase dioxin is transferred to solid phase, dioxin still exists in the flying dust, if mishandling, secondary pollution problem takes place very likely.The catalyst decomposes technology comes into one's own gradually in recent years, it at a certain temperature (180-250 ℃) dioxin can be decomposed into the hydrochloric acid gas (PerLiljelind etc. of carbon dioxide, water and trace, Removal of dioxins and related aromatic hydrocarbons from flue gasstreams by adsorption and catalytic destruction, Chemosphere 42:615-623 (2001)).Such catalyst mainly is to use shaped (as cellular) at present, and profiled member is hard, and this has limited its use to a certain extent.Along with the progress of powder process technology, expanded polytetrafluoroethylfiber fiber process technology, catalyst powder to be implanted in the expanded polytetrafluoroethylfiber fiber, this material has following advantage:
(1) increases the specific area of catalyst, improved catalytic efficiency;
(2) polytetrafluoroethylene (PTFE) can be in 180-250 ℃ temperature range uses for a long time, and the temperature of effective waste gas decomposition of catalyst is also in this scope, so the temperature coupling;
(3) expanded polytetrafluoroethylfiber fiber has multi-cellular structure, and waste gas can free pass through in fiber, can not increase air drag too much;
(4) fiber softening can be processed into various ways such as woven cloth, Nomex and use.
Therefore this material is subjected to the great attention of countries in the world.U.S. GORE company discloses processing side's (United States Patent (USP) 5620669) of this fiber: adopt catalyst pulp and PTFE dispersion liquid mixed, add cationic surfactant then, the drying of condensing then.Extrude the sheet material of 6 inches wide (15.24 centimetres) * 0.08 inch thick (0.2032 centimetre), roll into 0.002 inch thick (0.00508 centimetre) then, the back doubly gets final product (embodiment 1) at 270 ℃ of following stretching 1-2.This method is between a kind of method of splitting between film spinning and the lubricant extruding spinning.This method is to finish on special cutting apparatus, and this equipment precision requirement is high, and production efficiency is lower.
Summary of the invention
In order to overcome the existing defective of prior art the whole bag of tricks, the purpose of this invention is to provide a kind of preparation method who is used for the expanded polytetrafluoroethylfiber fiber of waste gas decomposition, this method is that expanded PTFE resin, lubricant, catalyst powder are mixed, spinning is made through operations such as super-dry, stretching, sintering then.
The technical solution adopted for the present invention to solve the technical problems is:
1. be used for the preparation method of the expanded polytetrafluoroethylfiber fiber of waste gas decomposition, it is characterized in that this method may further comprise the steps:
A, expanded PTFE resin and catalyst powder sieve
Expanded PTFE resin and catalyst powder is mixed, adopt 10 mesh sieves to sieve, sieve 3～5 times, prepare the mixture of powders of sieving;
B, mixed and screening
Fluid lubricant is joined in the described mixture of powders of sieving, place the capacity container that has airtight stopper to mix, mix for promoting, 1/3～2/3 space of container capacity keeps idle, after the mixing, hermetic seal this container to prevent the fluid lubricant volatilization;
C, slaking
After mixed, shake this container 30 minutes with the dispersing liquid lubricant, leave standstill, the expanded PTFE resin fully mixes with the liquid-liquid lubricant, and slaking then forms expanded PTFE and mixes material;
D, pressed compact and spinning
Described expanded PTFE is mixed material at 1kg/cm
2Pressure under, suppressed 1 minute, form cylindrical blank, blank diameter 10mm, long 25mm, and then extrude formation expanded PTFE monofilament with Shimazu flowing experiment instrument CFT-500 plunger;
E, degreasing, stretching and HEAT SETTING
With described expanded PTFE monofilament oven dry, to remove fluid lubricant, stretch then, last HEAT SETTING obtains to be used for the expanded polytetrafluoroethylfiber fiber that waste gas decomposes.
Used expanded PTFE resin degree of crystallinity is that 98-99.9%, molecular weight are 2,000,000～1,000 ten thousand among the described step a, for Powdered; Used catalyst powder be nanoscale to micron order, its main component is a kind of or its mixture in vanadic anhydride, vanadium trioxide, tungstic acid, titanium dioxide, the manganese dioxide; The used expanded PTFE resin and the weight ratio of catalyst powder are 1: 0.5～2.
Among the described step b, used fluid lubricant is the organic solvent or the oils solvent of hydro carbons; Used fluid lubricant weight is 15～50% of expanded PTFE weight resin.
Among the described step c, the used condition of leaving standstill is 0-60 ℃, time 60-180 hour; Used slaking condition is 40-90 ℃, time 8-30 hour.
In the described steps d, used expanded PTFE filament diameter is 0.3～0.6mm.
Among the described step e, used drying condition is 120～210 ℃ of oven dry 2～10 minutes; Described stretching condition is to stretch 1～5 times under the 180-350 ℃ of temperature; Described heat set conditions is 300-450 ℃, and the time is 10 seconds-2 minutes.
The present invention compares the beneficial effect that has with background technology:
(1) preparation method who is used for the expanded polytetrafluoroethylfiber fiber of waste gas decomposition of the present invention can adopt traditional harder, annotate equipment such as plug extruder, oven dry, stretching and HEAT SETTING, do not dispose special high-precision cutting apparatus, therefore production cost can reduce production costs widely well below splitting the film spinning.
(2) preparation method who is used for the expanded polytetrafluoroethylfiber fiber that waste gas decomposes of the present invention, with disclosed method in the U.S. GORE company (United States Patent (USP) 5620669) relatively, need not size mixing, loaded down with trivial details operations such as the drying of condensing, calendering, technological process is shortened greatly; In addition, need not use cationic surfactant, avoid the pollution that environment is brought because of surfactant.
The specific embodiment
Expanded PTFE resin degree of crystallinity among the present invention is 98～99.9%, molecular weight is 2,000,000～10,000,000, for Powdered, can adopt the commercially available prod, as a kind of or its mixing among the CD123 of F-106, the F104 of Daikin company or Japan AGC company;
Catalyst powder is from the nanoscale to the micron order among the present invention, preferred 20 nanometers～5 microns, its main component is a kind of or its mixture in vanadic anhydride, vanadium trioxide, tungstic acid, titanium dioxide, the manganese dioxide, can adopt the commercially available prod, as O4-85 (main component vanadic anhydride, removal nitrogen oxide), the O4-86 (main component vanadic anhydride, removal dioxin, furans, nitrogen oxide) that BASF AG produces, titanium/vanadium catalyst that CRI company produces;
Lubricant among the present invention is generally the organic solvent or the oils solvent of hydro carbons, as isopar-E, and isopar-H, isopar-M (making) by Esso Chemical CO., smoil P-55 (Matsumura SekiyuCo.), kerosene, naphtha, a kind of or its mixture in the benzinum etc.;
Embodiment 1:
A, expanded PTFE resin and catalyst powder sieve
With 0.5 kilogram of 1 kilogram of expanded PTFE resin (F-106 is available from Daikin company), catalyst powder (O4-85, available from BASF AG, powder diameter 30 nanometers), adopt 10 mesh sieves to sieve, sieving is no less than 3 times, the preparation mixture of powders of sieving;
B, mixed and screening
Kerosene is added in the above-mentioned mixture of powders of sieving (1.5 kilograms of the mixture of powders of sieving weight, kerosene is with respect to 15% of the expanded PTFE weight resin) for 0.15 kilogram, place the enough dry wide-mouth bottles of capacity that have airtight stopper to mix.Mix for promoting, 1/3～2/3 space of bottle capacity keeps idle.After the mixing, hermetic seal this bottle to prevent the lubricant volatilization;
C, slaking
After mixed, the jog air-tight bottle left standstill under 0 ℃ temperature 180 hours with dispersed lubricant in about 30 minutes, and toner is fully mixed with fluid lubricant, then 40 ℃ of following slakings 30 hours, formed the mixed material of expanded PTFE;
D, pressed compact and spinning
Described expanded PTFE is mixed material at 1kg/cm
2Pressure under, suppressed 1 minute, form cylindrical blank, blank diameter 10mm, long 25mm, and then extrude with Shimazu flowing experiment instrument CFT-500 plunger, the formation diameter is a 0.3mm expanded PTFE monofilament;
E, degreasing, stretching and HEAT SETTING
With 210 ℃ of oven dry of described expanded PTFE monofilament oven dry 2 minutes, to remove lubricant.Under 200 ℃ temperature, stretch 5 times then, 300 ℃ of following HEAT SETTING 2 minutes, obtain to be used for the expanded polytetrafluoroethylfiber fiber that waste gas decomposes subsequently.
The expanded polytetrafluoroethylfiber fiber that is used for the waste gas decomposition that obtains by said method is a grey, fibre strength was 2.4 gram/dawn, 60 microns of fibre diameters, fiber porosity 85%, the clearance to nitrogen oxide under 210 ℃ temperature reached for 97% (O4-85 of BASF AG is used to remove nitrogen oxide).
Embodiment 2:
A, expanded PTFE resin and catalyst powder sieve
With 0.5 kilogram of expanded PTFE resin F104 (available from Daikin company), 0.5 kilogram of expanded PTFE resin F106 (available from Daikin company), catalyst powder (O4-86, available from BASF AG, 1 micron of powder diameter) 1 kilogram, adopt 10 mesh sieves to sieve, sieving is no less than 3 times, prepares the mixture of powders of sieving;
B, mixed and screening
Benzinum is added in the above-mentioned mixture of powders of sieving (2 kilograms of the mixture of powders of sieving gross weights, benzinum is with respect to 25% of the expanded PTFE weight resin) for 0.25 kilogram, place the enough dry wide-mouth bottles of capacity that have airtight stopper to mix.For promoting to mix, the space of the 1/3-2/3 of bottle capacity keeps idle.After the mixing, hermetic seal this bottle to prevent the lubricant volatilization;
C, slaking
After mixed, the jog air-tight bottle left standstill under 30 ℃ temperature 120 hours with dispersed lubricant in about 30 minutes, and toner is fully mixed with fluid lubricant, then 66 ℃ of following slakings 15 hours, formed the mixed material of expanded PTFE;
D, pressed compact and spinning
Described expanded PTFE is mixed material at 1kg/cm
2Pressure under, suppressed 1 minute, form cylindrical blank, blank diameter 10mm, long 25mm, and then extrude with Shimazu flowing experiment instrument CFT-500 plunger, the formation diameter is a 0.4mm expanded PTFE monofilament;
E, degreasing, stretching and HEAT SETTING
With 180 ℃ of oven dry of described expanded PTFE monofilament oven dry 6 minutes, to remove lubricant.Under 260 ℃ temperature, stretch 3 times then, 320 ℃ of following HEAT SETTING 39 seconds, obtain to be used for the expanded polytetrafluoroethylfiber fiber that waste gas decomposes subsequently.
The expanded polytetrafluoroethylfiber fiber that is used for the waste gas decomposition that obtains by said method is a grey, fibre strength was 1.8 gram/dawn, 130 microns of fibre diameters, fiber porosity 72%, clearance to dioxin under 210 ℃ temperature reaches 93%, clearance to furans reaches 95%, and the clearance of nitrogen oxide was reached for 92% (O4-86 of BASF AG is used to remove dioxin, furans and nitrogen oxide).
Embodiment 3:
A, expanded PTFE resin and catalyst powder sieve
With expanded PTFE resin (CD123, available from Japan AGC company) 1.2 kilograms of 1 kilograms, catalyst powder (titanium/vanadium catalyst that CRI company produces, 4.2 microns of powder diameters), adopt 10 mesh sieves to sieve, sieving is no less than 3 times, prepares the mixture of powders of sieving;
B, mixed and screening
0.175 kilogram of lubricant isopar-E (available from Esso Chemical CO), naphtha are added the above-mentioned mixture of powders of sieving (2.2 kilograms of the mixture of powders of sieving gross weights for 0.175 kilogram, isopar-E is with respect to 35% of the expanded PTFE weight resin) in, place the enough dry wide-mouth bottles of capacity that have airtight stopper to mix.For promoting to mix, the space of the 1/3-2/3 of bottle capacity keeps idle.After the mixing, hermetic seal this bottle to prevent the lubricant volatilization;
C, slaking
After mixed, the jog air-tight bottle left standstill under 40 ℃ temperature 100 hours with dispersed lubricant in about 30 minutes, and toner is fully mixed with fluid lubricant, then 80 ℃ of following slakings 10 hours, formed the mixed material of expanded PTFE;
D, pressed compact and spinning
Described expanded PTFE is mixed material at 1kg/cm
2Pressure under, suppressed 1 minute, form cylindrical blank, blank diameter 10mm, long 25mm, and then extrude with Shimazu flowing experiment instrument CFT-500 plunger, the formation diameter is a 0.5mm expanded PTFE monofilament;
E, degreasing, stretching and HEAT SETTING
With 200 ℃ of oven dry of described expanded PTFE monofilament oven dry 7 minutes, to remove lubricant.Under 300 ℃ temperature, stretch 2 times then, 380 ℃ of following HEAT SETTING 50 seconds, obtain to be used for the expanded polytetrafluoroethylfiber fiber that waste gas decomposes subsequently.
The expanded polytetrafluoroethylfiber fiber that is used for the waste gas decomposition that obtains by said method is a grey, fibre strength was 1.3 gram/dawn, 250 microns of fibre diameters, fiber porosity 68%, clearance to dioxin under 210 ℃ temperature reaches 94%, clearance to furans reaches 90%, and the clearance of nitrogen oxide is reached 88%.
Embodiment 4:
A, expanded PTFE resin and catalyst powder sieve
With expanded PTFE resin (F104, available from Daikin company) 1 kilogram, catalyst powder O4-86 be (available from BASF AG, 2 microns of powder diameters) 1 kilogram, catalyst powder O4-85 are (available from BASF AG, 2 microns of powder diameters) 1 kilogram, adopt 10 mesh sieves to sieve, sieving is no less than 3 times, prepares the mixture of powders of sieving;
B, mixed and screening
Lubricant smoil P-55 (available from Matsumura Sekiyu Co.) is added the above-mentioned mixture of powders of sieving (3 kilograms of the mixture of powders of sieving gross weights for 0.5 kilogram, smoil P-55 is with respect to 50% of the expanded PTFE weight resin) in, place the enough dry wide-mouth bottles of capacity that have airtight stopper to mix.For promoting to mix, the space of the 1/3-2/3 of bottle capacity keeps idle.After the mixing, hermetic seal this bottle to prevent the lubricant volatilization;
C, slaking
After mixed, the jog air-tight bottle left standstill under 60 ℃ temperature 60 hours with dispersed lubricant in about 30 minutes, and toner is fully mixed with fluid lubricant, then 90 ℃ of following slakings 8 hours, formed the mixed material of expanded PTFE;
D, pressed compact and spinning
Described expanded PTFE is mixed material at 1kg/cm
2Pressure under, suppressed 1 minute, form cylindrical blank, blank diameter 10mm, long 25mm, and then extrude with Shimazu flowing experiment instrument CFT-500 plunger, the formation diameter is a 0.6mm expanded PTFE monofilament;
E, degreasing, stretching and HEAT SETTING
With 120 ℃ of oven dry of described expanded PTFE monofilament oven dry 10 minutes, to remove lubricant.Under 350 ℃ temperature, stretch 1 times then, 450 ℃ of following HEAT SETTING 10 seconds, obtain to be used for the expanded polytetrafluoroethylfiber fiber that waste gas decomposes subsequently.
The expanded polytetrafluoroethylfiber fiber that is used for the waste gas decomposition that obtains by said method is a grey, fibre strength was 1.0 gram/dawn, 200 microns of fibre diameters, fiber porosity 73%, clearance to dioxin under 210 ℃ temperature reaches 90%, clearance to furans reaches 95%, and the clearance of nitrogen oxide is reached 92%.
Described embodiment of the present invention now in detail, clearly can do a lot of improvement and variation for a person skilled in the art and can not deviate from essence spirit of the present invention.All these changes and improvements think all within the scope of the present invention that its feature is determined by above-mentioned specification.
Claims (6)
1. be used for the preparation method of the expanded polytetrafluoroethylfiber fiber of waste gas decomposition, it is characterized in that this method may further comprise the steps:
A, expanded PTFE resin and catalyst powder sieve
Expanded PTFE resin and catalyst powder is mixed, adopt 10 mesh sieves to sieve, sieve 3～5 times, prepare the mixture of powders of sieving;
B, mixed and screening
Fluid lubricant is joined in the described mixture of powders of sieving, place the capacity container that has airtight stopper to mix, mix for promoting, 1/3～2/3 space of container capacity keeps idle, after the mixing, hermetic seal this container to prevent the fluid lubricant volatilization;
C, slaking
After mixed, shake this container 30 minutes with the dispersing liquid lubricant, leave standstill, the expanded PTFE resin is fully mixed with fluid lubricant, slaking then forms expanded PTFE and mixes material;
D, pressed compact and spinning
Described expanded PTFE is mixed material at 1kg/cm
2Pressure under, suppressed 1 minute, form cylindrical blank, blank diameter 10mm, long 25mm, and then extrude formation expanded PTFE monofilament with Shimazu flowing experiment instrument CFT-500 plunger;
E, degreasing, stretching and HEAT SETTING
With described expanded PTFE monofilament oven dry, to remove fluid lubricant, stretch then, last HEAT SETTING obtains to be used for the expanded polytetrafluoroethylfiber fiber that waste gas decomposes.
2. the preparation method who is used for the expanded polytetrafluoroethylfiber fiber of waste gas decomposition according to claim 1, it is characterized in that: used expanded PTFE resin degree of crystallinity is that 98-99.9%, molecular weight are 2,000,000～1,000 ten thousand among the described step a, for Powdered; Used catalyst powder be nanoscale to micron order, its main component is a kind of or its mixture in vanadic anhydride, vanadium trioxide, tungstic acid, titanium dioxide, the manganese dioxide; The used expanded PTFE resin and the weight ratio of catalyst powder are 1: 0.5～2.
3. the preparation method who is used for the expanded polytetrafluoroethylfiber fiber of waste gas decomposition according to claim 1, it is characterized in that: among the described step b, used fluid lubricant is the organic solvent or the oils solvent of hydro carbons; Used fluid lubricant weight is 15～50% of expanded PTFE weight resin.
4. the preparation method who is used for the expanded polytetrafluoroethylfiber fiber of waste gas decomposition according to claim 1, it is characterized in that: among the described step c, the used condition of leaving standstill is 0-60 ℃, time 60-180 hour; Used slaking condition is 40-90 ℃, time 8-30 hour.
5. the preparation method who is used for the expanded polytetrafluoroethylfiber fiber of waste gas decomposition according to claim 1, it is characterized in that: in the described steps d, used expanded PTFE filament diameter is 0.3～0.6mm.
6. the preparation method who is used for the expanded polytetrafluoroethylfiber fiber of waste gas decomposition according to claim 1 is characterized in that: among the described step e, used drying condition is 120～210 ℃ of oven dry 2～10 minutes; Described stretching condition is to stretch 1～5 times under the 180-350 ℃ of temperature; Described heat set conditions is 300-450 ℃, and the time is 10 seconds-2 minutes.
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| US5591526A (en) * | 1994-06-15 | 1997-01-07 | W. L. Gore & Associates, Inc | Expanded PTFE fiber and fabric and method of making same |
| US5620669A (en) * | 1995-08-15 | 1997-04-15 | W. L. Gore & Associates, Inc. | Catalytic filter material and method of making same |
| CN1240004A (en) * | 1996-12-13 | 1999-12-29 | 大金工业株式会社 | Fibrous materials of fluororesins and deodorant and antibacterial fabrics made by using the same |
| CN1775847A (en) * | 2005-12-05 | 2006-05-24 | 浙江理工大学 | Method for preparing PTFE film material for air degerming |
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| CN1978717A (en) | 2007-06-13 |
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