CN101809397A - Infrared solvent stripping process - Google Patents
Infrared solvent stripping process Download PDFInfo
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- CN101809397A CN101809397A CN200880023899A CN200880023899A CN101809397A CN 101809397 A CN101809397 A CN 101809397A CN 200880023899 A CN200880023899 A CN 200880023899A CN 200880023899 A CN200880023899 A CN 200880023899A CN 101809397 A CN101809397 A CN 101809397A
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- 239000002904 solvent Substances 0.000 title claims abstract description 132
- 238000000034 method Methods 0.000 title claims abstract description 49
- 230000008569 process Effects 0.000 title claims abstract description 16
- 239000012530 fluid Substances 0.000 claims abstract description 41
- 239000000835 fiber Substances 0.000 claims abstract description 38
- 238000009987 spinning Methods 0.000 claims abstract description 30
- 230000005855 radiation Effects 0.000 claims abstract description 6
- 229920005594 polymer fiber Polymers 0.000 claims description 5
- 239000000126 substance Substances 0.000 claims description 5
- 230000005540 biological transmission Effects 0.000 claims description 3
- 229920000642 polymer Polymers 0.000 description 33
- 239000004744 fabric Substances 0.000 description 26
- 239000002121 nanofiber Substances 0.000 description 17
- 239000013557 residual solvent Substances 0.000 description 15
- 230000000694 effects Effects 0.000 description 11
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 9
- 239000000463 material Substances 0.000 description 7
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 description 5
- 238000007664 blowing Methods 0.000 description 5
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- 238000004090 dissolution Methods 0.000 description 2
- 238000010041 electrostatic spinning Methods 0.000 description 2
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- 238000010438 heat treatment Methods 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 238000004255 ion exchange chromatography Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
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- 229910001220 stainless steel Inorganic materials 0.000 description 2
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- 229920003043 Cellulose fiber Polymers 0.000 description 1
- BDAGIHXWWSANSR-UHFFFAOYSA-M Formate Chemical compound [O-]C=O BDAGIHXWWSANSR-UHFFFAOYSA-M 0.000 description 1
- 229920001410 Microfiber Polymers 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 229920002302 Nylon 6,6 Polymers 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- 238000000071 blow moulding Methods 0.000 description 1
- 239000003518 caustics Substances 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
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- 238000006243 chemical reaction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
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- 230000018044 dehydration Effects 0.000 description 1
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Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B3/00—Drying solid materials or objects by processes involving the application of heat
- F26B3/28—Drying solid materials or objects by processes involving the application of heat by radiation, e.g. from the sun
- F26B3/30—Drying solid materials or objects by processes involving the application of heat by radiation, e.g. from the sun from infrared-emitting elements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B13/00—Machines and apparatus for drying fabrics, fibres, yarns, or other materials in long lengths, with progressive movement
- F26B13/10—Arrangements for feeding, heating or supporting materials; Controlling movement, tension or position of materials
- F26B13/101—Supporting materials without tension, e.g. on or between foraminous belts
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B13/00—Machines and apparatus for drying fabrics, fibres, yarns, or other materials in long lengths, with progressive movement
- F26B13/24—Arrangements of devices using drying processes not involving heating
- F26B13/30—Arrangements of devices using drying processes not involving heating for applying suction
Abstract
A process for stripping chemically bonded spinning solvent from a solution-spun nonwoven web comprising the steps of providing a nonwoven web comprising solvent-laden polymeric fibers having average fiber diameters of less than about 1 micrometer, and transporting the nonwoven web through at least one infrared solvent stripping station wherein infrared radiation irradiates the nonwoven web in the absence of a solvent stripping fluid impinging on the nonwoven web in order to reduce the solvent concentration of the fibers to less than about 10,000 ppmw.
Description
The invention discloses a kind of method that contains reextraction solvent the solvent fiber from solution spun web.
Background technology
Solution spinning relates to required polymer dissolution is spun into fiber in suitable solvent and by polymer/solvent solution.Usually, this solvent is an organic solvent.When in the fabric that is applied to form thus, it has worthless characteristic, for example to the adverse effect of health, niff etc.
Solution spinning is usually used in making fiber and supatex fabric and has high-throughout advantage in some cases, and making can be in enormous quantities, commercially produce fiber or fabric.
In paper technology, for example at United States Patent (USP) 3,503,134 and 6,986, in disclosed those technologies, the dehydration that forms the wet-laying cellulose fibre of paper is carried out by the following method in 830: make the wet-laying cellulose net by vacuum aided porous rotating cylinder, the excessive moisture that produces in forming process will be sucked away from this paper web.United States Patent (USP) 3,503,134 disclose the effect of using hot-air, superheated steam or steam-air mixture to improve the vacuum aided drying.United States Patent (USP) 6,986,830 disclose the wet-laying paper web have been positioned between two softnesses, the porous fabrics width of cloth material, and wherein the porous fabrics on arbitrary of the paper web draws extra moisture by capillarity from paper.
The U.S. Patent application of having announced 2002/0092423 discloses a kind of fibroreticulate solution spinning of non-woven polymer that is used to form, a kind of specifically electrostatic spinning method, thus wherein the polymer solution grid formula gatherer that leaves charged revolving expeller and be directed to ground connection is made polymer microfibers or nanofiber.Solvent evaporates from " flight " fiber between transmitter and collector mess.
Summary of the invention
In the first embodiment, the present invention is a kind of method of spinning the spin solvent of non-woven webs reextraction chemical bonding from molten of being used for, said method comprising the steps of: provide to comprise that fiber diameter is less than the non-woven webs of about 1 micron solvent-laden polymer fiber and with at least one infrared solvent stripping station of non woven fibre network transmission process, its radiation of medium infrared is shone non-woven webs under the situation that does not have solvent stripping fluid impact non-woven webs, the solvent strength in the fiber is reduced to less than about 10 000ppmw.
The accompanying drawing summary
Incorporate this specification into and constitute its a part of accompanying drawing showing the present invention's contemplated embodiment at present, and illustrate principle of the present invention with this specification.
Fig. 1 blows the schematic diagram of equipment for the electricity that is used to prepare the prior art of nanometer fiber net according to the present invention.
Fig. 2 is the schematic diagram according to infrared solvent stripping of the present invention station.
Fig. 3 is the schematic diagram according to fluid/vacuum solvent stripping of the present invention station.
The specific embodiment
The present invention relates to be used for the solvent that multiple client's final use uses such as filter medium, energy storage separators, protective clothes etc. and spin fleece and fabric, comprise at least one layers of nanofibers; Also relate to the method that is used for from solution spun nanofiber net or the excessive spin solvent of fabric removal.
Still the fiber product that satisfies the multiple final use demand of client that need make by multiple polymers.Many polymer fibers and fleece can for example spun-bond process and meltblown form by melt spinning process.Yet the application power of melt spinning process only limits to be spun into fiber from the polymer of melt-processable, that is, at high temperature can soften or fusion and flow those.In a lot of final uses, still to wish to utilize polymer, they can not use melting method to form fibrous material, fabric and fleece.For the polymer with these non-melt-processed forms fibrous material, can use the solution spining technology.In addition, can use the solution spinning of the polymer of melting method can form fibrous material, fabric and fleece sometimes with different qualities.
As mentioned above, solution spinning, for example wet spinning silk, dry-spinning silk, flash-spinning, electrostatic spinning and electricity blow method, relate to required polymer dissolution in suitable solvent, are spun into fiber by polymer/solvent solution then.Usually, this solvent is an organic solvent, and in the time of in the fabric that is applied to form thus, it has worthless characteristic, for example to the adverse effect of health, niff etc.
Regrettably, when spinning a large amount of fabrics when forming basic weight so that high flux is molten greater than the non-woven webs of about 2 gram/square metre (gsm) by the spinning mould, can carry a large amount of residual solvents secretly in collected fabric or the fiber, this is because solvent has high physics and/or chemical affinity to the polymer that is spun into thus, and lacks time enough or the space is evaporated spin solvent fully between fiber forms and collects.In many cases, the solvent that is used for solution spinning shows toxicity in various degree, or there is negative effect in environment, or causes bad chemical reaction in concrete final use.Therefore, preferably from solution spun fibrous materials, remove residual solvent as much as possible.
In the supatex fabric spinning technique of routine, fabric spins and is wound into bigger volume with continuous substantially operation, even make that solvent can easily evaporate through placement, also just only rolling up the solvent of being carried secretly in the fabric on the skin can evaporate effectively, because the fabric of volume nexine is not exposed in the atmosphere.Disadvantageously, even fabric is launched the sufficiently long time so that the spin solvent evaporation also must have extremely long zone to provide the space for the fabric that launches, and it is very difficult and expensive to reclaim the solvent that evaporates.Be desirably in and transport to before the client, undesirable solvent is taken out in back extraction from fiber or fabric in process of production.
For polymer is dissolved in the solvent fully, the selection of any concrete polymer/solution spinning system all is based on the strong affinity of solvent to polymer, and this fact has determined that the removal of solvent is normally very complicated.In some cases, fibre-forming polymer has been full of solvent; Be that solvent molecule is absorbed and is dispersed in the polymer fiber.In other cases, solvent is chemically bonded on the polymer molecule that constitutes fiber, such as by hydrogen bond, Van der Waals for or even come bonding with the formation of ionic means by salt.
At some conventional solvent-spinning methods such as doing in the spin processes, the removal of high-affinity solvent realizes in the following way: fiber is spun in the hot gas " passage " that reaches 30 feet, and feeds high-temperature gas (up to 500 ℃) to drive away undesirable solvent in passage.Well imagine that this method relates to expensive equipment and is a kind of energy-intensive process.
Find that a kind of mode that strengthens the undesirable solvent of removal from solvent spun fibre is to dwindle the diameter of fiber itself, because diffusion devolatilization mechanism is followed 1/ diameter
2Relation.That is to say, compare that the solvent of carrying secretly is easier to be diffused out from the fiber than minor diameter with larger-diameter fiber.According to the present invention, preferably the diameter of solvent spun fibre is less than about 1 micron (nanofiber) the diffusion devolatilization mechanism with the optimization removal of solvents.
Term " nanofiber " is meant the fiber of diameter from tens nanometers to maximum hundreds of nanometers, but is generally less than about one micron, even less than about 0.8 micron, and even less than about 0.5 micron.
Be intended to stand molten yarn fabric and fleece that method of the present invention handles and comprise at least one polymer nanofiber layer.The fiber diameter of nanofiber is less than about 1 μ m, preferably between about 0.1 μ m and about 1 μ m, and has enough big basic weight to satisfy multiple commercialization final use, for example air/liquid filtration media, battery separator fabrics, protective clothes etc.
Disclose the method for the layers of nanofibers for preparing commercial quantity and basic weight in international publication number WO2003/080905 (United States serial 10/822,325), this international publication is incorporated this paper at this into way of reference.Fig. 1 is the electricity blowing schematic representation of apparatus that can be used for realizing the method for the invention, and described method adopts the electric blowing method (i.e. " electric blown spinning ") described in international publication number WO2003/080905.The electric blowing method of the prior art comprises: will be dissolved in polymer solution the solvent from mixing chamber 100 and send into by spinning manifold 102 and applied high-tension spinning nozzle 104, thereby the polymer solution that in blowing gas stream 106 Compressed Gas led when polymer solution leaves spinning head forms nanofiber, and collects nanofiber form fleece on the gatherer 110 ground connection under the vacuum that is produced by vacuum chamber 114 and hair-dryer 112.
Mobile collecting device is preferably mobile collecting belt, and this moves collecting belt and is set in place in the electrostatic field between spinning manifold 102 and gatherer 110.After the collection, with layers of nanofibers lead on the spinning manifold downstream wind-up roll and twine thereon.Randomly, nanometer fiber net can deposit on any porous scrim material that is arranged on the mobile collecting belt 110, for example spunbonded nonwovens, melt-blown non-woven material, needled punched nonwoven material, Woven fabric, knit goods, perforated film, paper and their combination.
Because the high flux of electric blow-forming facility (usually about 0.1 to 5 milliliter/hole/minute between) and be distributed in a large amount of spinning nozzles (hole) 104 on the whole spinning manifold 102, can prepare (with dry weight basis, i.e. residual solution evaporation or removal back) basic weight at about 2g/m by the nanofiber that in the one way of mobile collecting device, deposits from single spinning manifold
2With about 100g/m
2Between, even at about 10g/m
2With about 90g/m
2Between, and even at about 20g/m
2With about 70g/m
2Between single layers of nanofibers.Yet, same high flux cause owing to this method, the remaining spin solvent of significant quantity, especially those solvents that fibre-forming polymer is had strong affinity can be retained in the nanometer fiber net of formation like this.
It is found that, only collect, depend merely on and dwindle fibre diameter by vacuum aided, in addition be contracted to be lower than 1 micron or even be contracted to be lower than about 0.8 micron or even be lower than about 0.5 micron, will be not enough to from nanometer fiber net, reduce or eliminate remaining solvent.
Therefore, infrared solvent stripping method and apparatus of the present invention (Fig. 2) (it is arranged on the downstream (Fig. 1) of the collecting belt 110 of prior art equipment) is used for reducing or eliminating undesirable residual solvent in the solution spinning process in a continuous manner before rolling fabric or fleece.Alternatively, infrared solvent stripping method and apparatus of the present invention can " off-line " use or use with self-contained process after having collected as-spun nanoweb.
Infrared solvent stripping equipment comprises optional continuous moving belt 14, described moving belt is used to carry solvent spinning nano fibre net and optional carrying scrim 10 thereof, and through one or more infrared solvent strippings station 11, each described station includes infrared emitter 12 with its guiding.Infrared solvent stripping station 11 can be arranged on the either side or both sides on plane of solvent spinning nano fibre net.Fig. 2 shows two infrared solvent stripping stations 11 on the opposite side on plane of solvent spinning nano fibre net.
U.S. Patent Application Serial Number 11/640,625 (it incorporates this paper into way of reference) has been described a kind of method that is used for using the infrared solvent stripping station under the situation that solvent stripping fluid impact non-woven webs is arranged.By contrast, the present invention does not utilize fluid generating apparatus or vacuum source to come with solvent stripping fluid impact non-woven material during the solvent stripping step.
Not bound by theory, it is believed that the existing of reextraction fluid (even heating) can the cooling non-woven webs, thereby make the removal of solvent more difficult.In order to offset this effect, must apply the more infrared solvent stripping fluid that can maybe must utilize higher temperature.In addition, during the increase in temperature of hot external enwergy increase or solvent stripping fluid, the risk of degradable polymer also can increase.
Be surprised to find that, compare, do not use solvent stripping fluid impact non-woven webs removing also approximately effectively same or better effects if aspect the solvent with the situation of use solvent stripping fluid described in U.S. Patent Application Serial Number 11/640,625.Therefore, the cost that provides with heated solvent reextraction fluid has been provided in the present invention.
, just the solvent strength in the fibre-forming polymer might be reduced to without solvent stripping fluid impact non-woven material by infrared radiation less than about 10,000ppmw, even less than 1000ppmw, or even less than about 300ppmw.Infrared ray (IR) radiation source can be medium wavelength (1.5 microns to 5.6 microns) or short wavelength's (0.72 micron to 1.5 microns) source, and intensity can change solvent-laden nanometer fiber net is heated to the temperature of maximum a shade below the decomposition temperature of fleece polymer.We find, depend on that fleece is exposed to the time of staying of infrared radiation source, suitable fleece variation of temperature scope can be about 120 ℃ to up to about 340 ℃ and can not decompose the fleece polymer.
Can benefit from polymer/solvent combination of the present invention and be polymer wherein solvent is shown those of strong affinity, especially wherein between polymer and solvent, generate those of chemical bond (for example hydrogen bond etc.).Some polymer/solvent combination that are difficult to separate are polyamide/formic acid and polyvinyl alcohol/water.
Depend on the affinity of concrete spin solvent, maybe advantageously in solvent stripping equipment, comprise more than one infrared solvent stripping station so that in a plurality of steps, reduce residual solvent concentration to fibre-forming polymer.In addition, also can use fluid/vacuum solvent stripping station described in U.S. Patent Application Serial Number 11/640625.
Fluid/vacuum solvent stripping method and apparatus (Fig. 3) can be arranged on prior art equipment collecting belt 110 downstream (Fig. 1) and can be arranged on before or after the infrared solvent stripping equipment, it can be further used for reducing or eliminating undesirable residual solvent before rolling fabric or the fleece in a continuous manner in the solution spinning process.
Fluid/vacuum solvent stripping equipment comprises: optional continuous moving belt 14, described moving belt be used to carry solvent spinning nano fibre net and optional carrying scrim 10 thereof and with its guiding through one or more solvent strippings station 20, each in the described station includes the fresh solvent reextraction fluid heating 16 on the side that is arranged on moving belt 14; And be arranged on vacuum equipment 18 on the opposite side of moving belt 14." fresh solvent reextraction fluid " 17 (being generally gas) are impacted the solution spun web that moves, and vacuum equipment helps suction reextraction fluid to pass solution spun web to realize solvent stripping simultaneously.Preferably, the solvent slop fluid collector (not shown) of stripping is arranged on the downstream of vacuum equipment, comes to wash excessive spin solvent so that recycle or handle in order to collection from useless reextraction fluid.Can in each solvent stripping station, control temperature, vacuum pressure even fresh solvent reextraction fluid itself separately.
Embodiment
By nylon 6,6 polymer
FE3218 (derives from E.I.du Pont de Nemoursand Company, Wilmington, Delaware) formic acid solvent that is dissolved in 99% purity (derives from Kemira Oyj, Helsinki, Finland) polymer solution of 24 weight % concentration of gained prepares the following examples through the non-woven webs that electricity blowing formation contains some residual solvents.
The wet chemical method of use standard and ion chromatography analysis are measured the residual formic acid content in the nonwoven sheet of nylon.In typical mensuration, the sample of known quality is placed caustic solution.By the aliquot of ion chromatography analysis gained solution, the amount of formic acid is proportional in corresponding peak area of the formic acid that has neutralized (formate ion) and the sample.
Comparative Example A An
Prepared Comparative Example A An as described above, and on the porous screen cloth that moves, sent it in the fluid/vacuum solvent stripping station.Temperature is that 120 ℃ solvent stripping fluid (air) impacts non-woven webs from one side, and the another side at non-woven webs applies vacuum simultaneously.Vacuum measurement is about 180mm H
2O.Air pressure and vacuum acting in conjunction produce near constant atmospheric pressure in the solvent stripping station.Non-woven webs is rested in the solvent stripping station 4.3 seconds.This non-woven webs does not stand the processing of solvent stripping method of the present invention.Final solvent is 1820ppm, and described content was measured before preparation Comparative Examples B and embodiment 1.
Comparative Examples B
Comparative Examples B prepares in the mode identical with Comparative Example A An, different is, according to the method for U.S. Patent Application Serial Number 11/640,625, it is additionally transmitted through the infrared solvent stripping station, solvent stripping fluid impact non-woven webs is wherein arranged.This station of stripping by stainless steel band, rolling station, infrared heater, be positioned at fixedly vacuum source below the band of infrared heater below and two and add the hot-air source and form, described one in the hot-air source that adds was impacted perpendicular to non-woven webs before infrared heater, and another impacts perpendicular to non-woven webs after infrared heater.Infrared heater is the radiant energy heater, is a kind of 3 phase shortwave heaters, and rated value is 12kW, 240 volts, and be set on the sufficiently high gear fleece is heated to 180 ℃.Temperature is that 100 ℃ hot-air scans above fleece.Vacuum source is positioned on the opposite side of non-woven webs and infrared heater, has 114.3mm H
2The vacuum of O.With the speed charging process dryer of fleece with 1.016 meters/minute, this is corresponding to about 15 seconds total residence time.The temperature survey of the sheet in the baking oven is average 153 ℃.Final solvent is 1431ppm.
Embodiment 1
Embodiment 1 prepares in the mode identical with Comparative Example A An, and different is it is additionally transmitted through the infrared solvent stripping station, and solvent-free reextraction fluid to be towards non-woven webs.This station of stripping is made up of stainless steel band, rolling station and infrared heater.Infrared heater is the radiant energy heater, is a kind of 3 phase shortwave heaters, and rated value is 12kW, 240 volts, and be set on the sufficiently high gear fleece is heated to 180 ℃.On fibroreticulate both sides, all do not utilize impact fluid.With fleece with 1.016 meters/minute speed charging below heater, thereby cause time of staying of 15 seconds.Final solvent is 696ppm.
Comparative Example A An has shown the effect at the fluid/vacuum solvent stripping station when solvent stripping fluid impact non-woven webs is arranged, and it is removed to residual solvent the content that is suitable for some commercial uses.
Comparative Examples B has shown the effect that the infrared based solvent when solvent stripping fluid impact non-woven webs is arranged is stripped, and it has removed additional residual solvent.
The effect that infrared based solvent when embodiment 1 has shown solvent-free reextraction fluid impact non-woven webs is stripped, it has been removed additional residual solvent and has made and only have extremely low residual solvent content in the non-woven webs.
Comparing embodiment C
Comparing embodiment C is as mentioned in such preparation the described in the embodiment part, and on the porous screen cloth that moves it transmitted in the fluid/vacuum solvent stripping station.Temperature is that 65 ℃ solvent stripping fluid (air) impacts non-woven webs from one side, and the another side at non-woven webs applies vacuum simultaneously.Vacuum measurement is about 100mm H
2O.Air pressure and vacuum acting in conjunction produce near constant atmospheric pressure in the solvent stripping station.Non-woven webs is rested in the solvent stripping station 20 seconds.This non-woven webs does not stand the processing of solvent stripping method of the present invention.Final solvent is 7501ppm.
Comparing embodiment D, E and F
Comparing embodiment D, E prepare in the mode identical with comparing embodiment C with F, and different is, they are additionally transmitted through the infrared solvent stripping zone, and solvent stripping fluid impact non-woven webs is wherein arranged.This additional step is included in fleece is transmitted through in the process of float drier.Dryer is made up of three parts, and each constitutes described part by the two row's infrared heaters that are in fibroreticulate above and below.Used infrared heater is Radplane series 80 heaters that derive from GlenRo, and rated value is 31.4kW, 480 volts, and 1 phase, medium wavelength.The temperature that is respectively applied for comparing embodiment D, E and F is that the hot-air of 49 ℃, 107 ℃ and 205 ℃ counters to fibroreticulate motion and scans in fibroreticulate above and below.With the speed charging process dryer of fleece with 12.2 meters/minute, this is corresponding to about 12 seconds total residence time.Final solvent is respectively 2624ppm, 596ppm and 235ppm.
Embodiment 2
Embodiment 2 prepares in the mode identical with comparing embodiment C, and different is it is additionally transmitted through the infrared solvent stripping station, and solvent-free reextraction fluid to be towards non-woven webs.This additional step is included in fleece is transmitted through in the process of float drier.Dryer is made up of three parts, and each described part constitutes by the two row's infrared heaters that are in fibroreticulate above and below.Used infrared heater is Radplane series 80 heaters that derive from GlenRo, and rated value is 31.4kW, 480 volts, and 1 phase, medium wavelength.Different with comparing embodiment D, E and F, hot-air does not counter to fibroreticulate motion and scans in fibroreticulate above and below.Fleece is fed by dryer with 12.2 meters/minute speed, and this is corresponding to about 12 seconds total residence time.Final solvent is 337ppm.
Comparing embodiment D, E and F have shown the effect that the infrared based solvent when solvent stripping fluid impact non-woven webs is arranged is stripped, and it has removed additional residual solvent.The amount of removed residual solvent depends on the temperature of solvent stripping fluid largely.
The effect that infrared based solvent when embodiment 2 has shown solvent-free reextraction fluid impact non-woven webs is stripped, it has been removed additional residual solvent and has made and only have extremely low residual solvent content in the non-woven webs.Residual solvent content in this material almost is low to moderate the situation of comparing embodiment F, but when not using the reextraction fluid of heat, the possibility of depolymerization significantly reduces.Be summarized in the table 1 from the data of comparing embodiment D, E and F and embodiment 2 gained.
Table 1
| Sample | Speed | Air blast output | Air themperature | Final average content |
| ??m/min | ??％ | ??℃ | ??ppm | |
| Comparing embodiment C | ??- | ??- | ??- | ??7501 |
| Comparing embodiment D | ??12.2 | ??75 | ??49 | ??2624 |
| Comparing embodiment E | ??12.2 | ??75 | ??107 | ??596 |
| Comparing embodiment F | ??12.2 | ??75 | ??205 | ??235 |
| Embodiment 2 | ??12.2 | Close | ??- | ??373 |
These embodiment show that infrared based solvent of the present invention is stripped to stand and can be prepared the molten non-woven webs that spins that does not contain spin solvent substantially.
Claims (7)
1. be used for the method for spinning the spin solvent of non-woven webs reextraction chemical bonding from molten, said method comprising the steps of:
Non-woven webs with solvent-laden polymer fiber is provided, and the fiber diameter of described polymer fiber is less than about 1 micron, and
With at least one infrared solvent stripping station of described non woven fibre network transmission process, its radiation of medium infrared is shone described non-woven webs under the situation that does not have the described non-woven webs of solvent stripping fluid impact, the solvent strength in the described fiber is reduced to less than about 10 000ppmw.
2. according to the process of claim 1 wherein that described fiber diameter is less than 0.8 micron.
3. according to the method for claim 2, wherein said fiber diameter is less than 0.5 micron.
4. described solvent strength is reduced to less than 1 000ppmw according to the process of claim 1 wherein.
5. according to the method for claim 4, wherein described solvent strength is reduced to less than 300ppmw.
6. according to the process of claim 1 wherein that described non-woven webs is transmitted through described solvent stripping station on scrim.
7. according to the method for claim 1, described method also comprises described non woven fibre network transmission through at least one the fluid/vacuum solvent stripping station before or after described at least one infrared solvent stripping station.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US95904507P | 2007-07-11 | 2007-07-11 | |
| US60/959,045 | 2007-07-11 | ||
| PCT/US2008/069717 WO2009009707A1 (en) | 2007-07-11 | 2008-07-11 | Infrared solvent stripping process |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101809397A true CN101809397A (en) | 2010-08-18 |
| CN101809397B CN101809397B (en) | 2013-11-13 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008800238991A Active CN101809397B (en) | 2007-07-11 | 2008-07-11 | Infrared solvent stripping process |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP2174084B1 (en) |
| JP (1) | JP5377479B2 (en) |
| KR (1) | KR20100047257A (en) |
| CN (1) | CN101809397B (en) |
| WO (1) | WO2009009707A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107300315A (en) * | 2017-04-30 | 2017-10-27 | 田东昊润新材料科技有限公司 | A kind of chain-arranged type constant temperature drying unit |
| CN114808162A (en) * | 2022-04-28 | 2022-07-29 | 上海迅江科技有限公司 | Flash spinning/electrostatic spinning composite superfine nanofiber material and preparation method thereof |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107604536B (en) * | 2017-09-12 | 2020-08-25 | 曾林涛 | Preparation method and device of fluffy elastic three-dimensional micro-nano fiber material, fiber material prepared by method and application of fiber material |
Family Cites Families (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61231255A (en) * | 1985-04-01 | 1986-10-15 | 東燃料株式会社 | Pluran fluffy body |
| JPS61231210A (en) * | 1985-04-01 | 1986-10-15 | Toa Nenryo Kogyo Kk | Production of fibrous material of water-soluble resin |
| US4798007A (en) * | 1987-05-28 | 1989-01-17 | Eichenlaub John E | Explosion-proof, pollution-free infrared dryer |
| US5837372A (en) * | 1996-05-06 | 1998-11-17 | The Dow Chemical Company | Pliable tackified fiber tow and method of producing same |
| US6049995A (en) * | 1999-04-20 | 2000-04-18 | Megtec Systems, Inc. | Infrared dryer with air purge shutter |
| KR100549140B1 (en) * | 2002-03-26 | 2006-02-03 | 이 아이 듀폰 디 네모아 앤드 캄파니 | A electro-blown spinning process of preparing for the nanofiber web |
| US8129297B2 (en) * | 2002-07-29 | 2012-03-06 | E. I. Du Pont De Nemours And Company | Method and apparatus for heating nonwoven webs |
| RU2005131013A (en) * | 2003-03-07 | 2006-03-20 | Филип Моррис Продактс С.А. (Ch) | METHOD FOR ELECTROSTATIC PROCESSING OF POLYMER COMPOSITIONS AND DEVICE FOR ITS IMPLEMENTATION |
| US20050056956A1 (en) * | 2003-09-16 | 2005-03-17 | Biax Fiberfilm Corporation | Process for forming micro-fiber cellulosic nonwoven webs from a cellulose solution by melt blown technology and the products made thereby |
| WO2005085730A2 (en) * | 2004-03-02 | 2005-09-15 | Nv Bekaert Sa | Infrared drier installation for passing web |
| EP1921183B1 (en) * | 2005-08-09 | 2013-01-23 | Toray Industries, Inc. | Flame-resistant fiber, carbon fiber, and processes for the production of both |
| US20080113575A1 (en) * | 2006-11-09 | 2008-05-15 | Davis Michael C | Solvent stripping process |
| US7592415B2 (en) * | 2006-12-18 | 2009-09-22 | E. I. Du Pont De Nemours And Company | Infrared solvent stripping process |
-
2008
- 2008-07-11 CN CN2008800238991A patent/CN101809397B/en active Active
- 2008-07-11 JP JP2010516256A patent/JP5377479B2/en not_active Expired - Fee Related
- 2008-07-11 WO PCT/US2008/069717 patent/WO2009009707A1/en active Application Filing
- 2008-07-11 KR KR1020107002979A patent/KR20100047257A/en not_active Application Discontinuation
- 2008-07-11 EP EP08781650.0A patent/EP2174084B1/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107300315A (en) * | 2017-04-30 | 2017-10-27 | 田东昊润新材料科技有限公司 | A kind of chain-arranged type constant temperature drying unit |
| CN114808162A (en) * | 2022-04-28 | 2022-07-29 | 上海迅江科技有限公司 | Flash spinning/electrostatic spinning composite superfine nanofiber material and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| EP2174084A1 (en) | 2010-04-14 |
| KR20100047257A (en) | 2010-05-07 |
| JP2010533248A (en) | 2010-10-21 |
| JP5377479B2 (en) | 2013-12-25 |
| EP2174084B1 (en) | 2014-03-19 |
| WO2009009707A1 (en) | 2009-01-15 |
| CN101809397B (en) | 2013-11-13 |
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