EP1549788A4 - Procede de fabrication de fibres cellulosiques renfermant du ptfe - Google Patents

Procede de fabrication de fibres cellulosiques renfermant du ptfe

Info

Publication number
EP1549788A4
EP1549788A4 EP03770620A EP03770620A EP1549788A4 EP 1549788 A4 EP1549788 A4 EP 1549788A4 EP 03770620 A EP03770620 A EP 03770620A EP 03770620 A EP03770620 A EP 03770620A EP 1549788 A4 EP1549788 A4 EP 1549788A4
Authority
EP
European Patent Office
Prior art keywords
ptfe
fiber
viscose
cellulose
fibers
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP03770620A
Other languages
German (de)
English (en)
Other versions
EP1549788A1 (fr
Inventor
William Neuberg
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shamrock Technologies Inc
Original Assignee
Shamrock Technologies Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shamrock Technologies Inc filed Critical Shamrock Technologies Inc
Publication of EP1549788A1 publication Critical patent/EP1549788A1/fr
Publication of EP1549788A4 publication Critical patent/EP1549788A4/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F1/00—General methods for the manufacture of artificial filaments or the like
    • D01F1/02—Addition of substances to the spinning solution or to the melt
    • D01F1/10—Other agents for modifying properties
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F2/00—Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof
    • D01F2/02—Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof from solutions of cellulose in acids, bases or salts
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F2/00—Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof
    • D01F2/06—Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof from viscose
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F2/00—Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof
    • D01F2/06—Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof from viscose
    • D01F2/08—Composition of the spinning solution or the bath
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F2/00—Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof
    • D01F2/06—Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof from viscose
    • D01F2/08—Composition of the spinning solution or the bath
    • D01F2/10—Addition to the spinning solution or spinning bath of substances which exert their effect equally well in either
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
    • Y10T428/2913—Rod, strand, filament or fiber
    • Y10T428/2927—Rod, strand, filament or fiber including structurally defined particulate matter

Definitions

  • the present invention generally relates to a method for incorporating highly dispersible polytetrafluoroethylene (PTFE) powder into solution spun synthetic fibers so that the resulting fibers have improved properties generally associated with PTFE, including, for example, low coefficient of friction, improved wear resistance, hydrophobicity, improved stain resistance and improved light stability and UN-light resistance, when compared to conventional solution spun synthetic fibers.
  • PTFE polytetrafluoroethylene
  • the present invention further relates to solution spun fibers with incorporated PTFE made by the method described herein, and to textiles, fabrics, and other articles of manufacture that are made from these solution spun synthetic fibers.
  • solution spinning or wet spinning processes are employed with fiber-forming substances that have been dissolved in a solvent.
  • the spinnerets forming the filaments are submerged in a wet chemical bath, and as the filaments of the fiber- forming substances emerge from the spinnerets, they are induced to precipitate out of the solution and solidify.
  • Synthetic fibers that are commonly produced by solution spinning processes include rayon fibers, acrylic fibers, aramid fibers, such as Kevlar ® para-aramid fibers, modacrylic fibers, and spandex fibers, among others. These synthetic fibers are made from fiber-forming substances, which primarily are soluble cellulose or soluble compounds of cellulose.
  • Rayon which is one of the most common synthetic fibers produced by solution spinning, is defined as a manufactured fiber composed of what is known as "regenerated” cellulose in which substituents have replaced not more than 15% of the hydrogens of the hydroxyl groups. See e.g., Rules And Regulations Under The Textile Fiber Products Identification Act, 16 CFR Part 303.
  • purified cellulose is chemically converted into a soluble compound, and a solution of this compound is passed through the spinneret to fonn soft filaments that are then converted or "regenerated” into almost pure cellulose. Because of this reconversion of the soluble compound into cellulose, rayon is commonly referred to as a regenerated cellulose fiber.
  • Additives e.g., dyes or surfactants
  • the fiber-forming substance such as cellulose
  • Additives maybe added to the fiber-forming substance (such as cellulose) prior to extrusion in order to improve the quality of the resulting solution spun fibers.
  • PTFE polytetrafluoroethylene
  • PTFE provides characteristics such as improved slipperiness and non-wettability to other materials into which it is incorporated.
  • PTFE is useful when in a powder form or a dispersion form for this purpose.
  • Dry PTFE powder products are known in the art and are generally available in the industry.
  • Several manufacturers in the fluoropolymer industry produce PTFE powders, and some of these manufacturers describe the PTFE particle size in their powders as being "submicron" or capable of being dispersed to submicron size.
  • small particle size or submicron PTFE A wide array of end uses exists for small particle size or submicron PTFE.
  • small amounts (e.g., about 0.1 to 2% by weight) of powdered PTFE maybe incorporated into a variety of product compositions to provide favorable and beneficial characteristics, hi inks, incorporated PTFE provides excellent mar and rub resistance characteristics.
  • incorporated PTFE provides a silky feel.
  • sunscreens incorporated PTFE provides increased shielding from UN rays or increased SPF (sun protection factor).
  • incorporated PTFE provides superior lubrication, i coatings and thermoplastics, incorporated PTFE provides improved abrasion resistance, chemical resistance, weather resistance, water resistance, and film hardness.
  • submicron PTFE powders and dispersions include, for example, incorporation of a uniform dispersion of submicron PTFE particles into electroless nickel coatings to improve the friction and wear characteristics of such coatings (see e.g. Hadley et al., Metal Finishing, 85:51-53 (December 1987)); incorporation of submicron PTFE particles into a surface finish layer for an electrical connector contact, wherein the PTFE particles provide wear resistance to the surface finish layer (U.S. Patent No.
  • PTFE is chemically inert, physically smooth (i.e. has a low coefficient of friction) and hydrophobic.
  • the beneficial properties of PTFE are propagated through out the application or end use product composition, h addition, because submicron PTFE particles have a low particle size, they possess a significantly higher ratio of surface area to weight when compared to larger PTFE particles.
  • submicron PTFE particles are better able to supply their useful effects to a desired application system than the same weight of larger PTFE particles.
  • a general need exists in the fiber making art for incorporating PTFE in to synthetic fibers. It particular, it may be commercially desirable, for example, to have fibers that are spun by a solution spinning process possess the improved properties associated with PTFE.
  • a specific need exists for a convenient and inexpensive PTFE powder that is dispersible to low micron or submicron particle size that can be incorporated into fiber-forming substances that are used in making solution spun fibers.
  • the uniformity and permanence of the PTFE distribution through the body of a fiber may ensure that textiles, fabrics and clothing made from the solution spun fibers will not lose, over time, the enhanced properties associated with PTFE because of surface wear and tear.
  • the present invention addresses these and other needs.
  • the present invention relates to a novel method by which polytetrafluoroethylene (PTFE) is incorporated into a synthetic solution spun fiber so that the resulting fiber has many improved characteristics and properties when compared to conventional solution spun fibers.
  • PTFE powder that is dispersible to low micron or submicron particle size first is added into a fiber-forming substance (such as cellulose) feed, which is suitable for solution spinning of fibers.
  • a fiber-forming substance such as cellulose
  • the PTFE-containing fiber-forming substance or feed is solution spun into filaments or fibers.
  • the resulting filaments or fibers contain PTFE particles dispersed therein.
  • the PTFE particles may be uniformly or homogeneously dispersed in the bodies of the resulting filaments or fibers.
  • the resulting filaments or fibers have the improved properties associated with PTFE.
  • the solution spun fibers resulting from the method of the present invention exhibit a significant decrease in the coefficient of friction when compared to conventional solution spun fibers.
  • the use of low micron or submicron particle size PTFE powder as an additive to the fiber-forming substances used to make certain synthetic fibers is also important in that the added PTFE improves the non- wetting properties of the fibers and textiles made from such fibers.
  • fibers with incorporated PTFE (“PTFE- enhanced fibers”) may be useful in industrial textiles that are used in articles or products that are used for filtration and dewatering processes.
  • Such PTFE-enhanced fibers also may be advantageously used in producing carpets, fabrics for sportswear and outerwear, hot-air balloons, car and plane seats, umbrellas, and the like.
  • the fibers of the present invention may be advantageously used to make tightly woven fabrics for use in parachutes, boat sails, and similar applications.
  • a combination of a tight weave and the hydrophobic properties of the PTFE-enhanced fiber may provide a textile or fabric for clothing that is both water-repellent and breathable.
  • the inclusion of PTFE-enhanced fibers into such textiles also may beneficially result in other advantages, such as the textile articles being easier to clean.
  • the method of the present invention is useful in that the resulting PTFE-enhanced solution spun fibers have many improved properties when compared to conventional synthetic solution spun fibers.
  • Some of these improved properties include but are not limited to the following: lower coefficient of friction; reduced wettability; improved stain resistance; improved washability; improved opacity; enhanced protection from ultraviolet radiation (UV), which increases the light- fastness and the lifetime of the fiber or fabric; increased color fastness; reduced gas permeability; better abrasion resistance; tighter weave; improved wear index; increased flexibility of the fiber; decreased scroop (where scroop generally refers to sounds of rubbing made by certain fabrics); and lowered amounts of wrinkling when the PTFE-enhanced fibers are incorporated into a fabric or clothing article.
  • UV ultraviolet radiation
  • the method of the present invention results in improved solution spun fibers, but also the method serves to significantly improve the overall processes by which synthetic fibers are typically made.
  • the increased lubricity or slipperiness of the fiber-forming substance due to the addition of PTFE in it may result in lower production times for fiber production, significantly increased processing speeds, increased throughput rates and overall production rates.
  • the increased lubricity of the fiber- forming materials due to the PTFE addition also may give a longer lifetime to the fiber-making equipment, and provide overall savings in energy that is expended in miming the fiber-making equipment.
  • the present invention relates to a method for making improved solution spun fibers, wherein the fibers are more wear resistant and have a lower coefficient of friction than conventional solution spun fibers that are known in the art.
  • the inventive method improves the quality of a fiber by introducing PTFE that is dispersible to low micron or submicron particle size into the fiber-forming substance from which the fiber is made by a solution spinning process.
  • the PTFE-enhanced solution spun fibers that are made by the method exhibit, among other properties, increased wear resistance, stain resistance, water resistance, and a significantly decreased coefficient of friction, when compared to conventional solution spun fibers known in the art.
  • An important objective of the present invention is to incorporate PTFE throughout a solution spun fiber so that the fiber contains a uniform distribution PTFE through its material body. Thus all sub regions or sections of the fiber have the enhanced properties afforded to the fiber by PTFE. This is in comparison or contrast to other processes and fibers known in the art in which PTFE is only incorporated in the surface layers of fibers or applied to solution spun fibers (or fabrics made from such fibers) as a surface coating.
  • PTFE powder that is dispersible to submicron particle size PTFE powder that is dispersible to low micron particle size
  • aqueous or organic dispersions of PTFE powder that are dispersible to submicron particle size aqueous or organic dispersions of PTFE powder that is dispersible to low micron particle size.
  • the designation "submicron particle size” indicates that a given quantity of PTFE powder disperses in isopropyl alcohol (IP A) such that more than about 90%, preferably, more than about 95%, and more preferably, more than about 99% of the PTFE particles have a particle size that is less than about 1.00 ⁇ m.
  • the designation "low micron particle size” indicates that a given quantity of PTFE powder disperses in isopropyl alcohol (IP A) such that about 95% or more of the PTFE particles have a particle size that is less than about 10.00 ⁇ m.
  • the dispersibility of the PTFE powder down to low micron or submicron-sized particles may be important for unhindered practice of solution spinning processes. These small size PTFE particles may pass through spinneret holes with ease, unlike large sized PTFE particles that can clog spinnerets making fiber formation difficult. It is also envisioned that the method of the present invention allows for PTFE that is dispersible to low micron particle size to be used in higher denier fibers, while PTFE that is dispersible to submicron particle size will be useful for forming both low and high denier fibers.
  • the PTFE particles may be uniformly or homogeneously dispersed through the bodies of the fiber of any denier size.
  • the dispersibility of the PTFE particles in a powder may be determined by dispersing an amount of the PTFE powder in isopropyl alcohol (IP A). Then by conventional particle size analysis (e.g., light scattering analysis), an indication of the mean particle size and the particle size distribution of the PTFE powder may be obtained. Thus a user can verify or confirm, for example, if a sample of PTFE powder is completely (100%) dispersible to submicron in size or otherwise suitable for use in solution spinning processes. As mentioned above, aqueous or organic dispersions of PTFE that is dispersible either to submicron particle size or low micron particle size may be used in the solution spinning processes.
  • a pelletized master batch having an appropriate concentration of PTFE e.g., 5% to 60 %) may optionally be used for this purpose.
  • dry PTFE powder that is dispersible either to submicron or low micron particle size may be dispersed directly into the fiber-forming substance (such as cellulose).
  • an aqueous or organic dispersion of PTFE that is dispersible either to submicron particle size or low micron particle size is first provided. The steps of an inventive process for making a PTFE-enhanced solution spun fiber are then employed.
  • the rayon making processes typically utilize cellulose as a raw material.
  • purified cellulose is used as the fiber-forming material in the production of rayon.
  • the purified cellulose is prepared from specially processed wood pulp and is sometimes referred to as "dissolving cellulose” or “dissolving pulp” to distinguish it from lower grade pulps that are used for papermaking or other purposes.
  • Dissolving cellulose is characterized as having a high ⁇ -cellulose content, which means that the cellulose consists mainly of long-chain molecules and is relatively free from lignin and hemicelluloses or other short-chain carbohydrates.
  • the purified cellulose is often obtained in the form of cellulose sheets.
  • the cellulose sheets are first wetted with a wetting agent.
  • This wetting step provides one way of incorporating PTFE according to the present invention.
  • the wetting agent is usually water.
  • the cellulose sheets may be wetted with an aqueous dispersion of PTFE that is dispersible either to submicron particle size or low micron particle size.
  • the PTFE may be incorporated into the cellulose sheets mechanically, for example, by mixing, stirring or blending. As shown below, in alternative embodiments, the PTFE may be incorporated into the cellulose at any process step or point prior to the spinning of the rayon filaments.
  • the wetted cellulose sheets (that were wetted with an aqueous dispersion of highly dispersible PTFE) are saturated with a solution of caustic soda (or sodium hydroxide).
  • caustic soda or sodium hydroxide
  • the wetted cellulose sheets are allowed to steep for sufficient time for converting some of the cellulose into “soda cellulose” (or the sodium salt of cellulose).
  • the soda cellulose is squeezed mechanically to remove excess caustic soda solution.
  • the soda cellulose is then mechanically shredded to small size fragments to increase its active surface area, and thereby to make the soda cellulose more soda cellulose more processible.
  • This shredded cellulose is typically referred to as "white crumb.”
  • this white crumb is allowed to stand in contact with the oxygen of the ambient air. The contact with the oxygen partially oxidizes the white crumb (because of the high alkalinity of the white crumb) and degrades the cellulose in the white crumb to lower molecular weights (i.e. shorter chain length molecules).
  • the aging times and degradation conditions are carefully controlled to produce chain lengths that are short enough to give manageable viscosities in the spinning solution, but still long enough to impart good physical properties to the solution spun fiber product.
  • the white crumb is placed into a chum or some other mixing vessel and is treated with gaseous carbon disulfide (CS 2 ) in a "xanthation” step .
  • CS 2 gaseous carbon disulfide
  • the incorporation of the aqueous dispersion of the PTFE may conveniently occur just after the aging process, as the white crumb is placed into the chum and/or being treated with CS in the chum.
  • the soda cellulose reacts with the CS 2 to form xanthate ester groups.
  • the CS 2 also reacts with the alkaline medium to form inorganic impurities, which give the cellulose mixture a characteristic yellow color.
  • yellow crumb This material that results from the xanthation process is typically referred to as "yellow crumb.” Subsequently, the yellow crumb is dissolved in aqueous caustic solution in a "dissolving" step, hi certain embodiments of the present invention, the aqueous dispersion of highly dispersible PTFE may be conveniently added at this stage to the yellow crumb. The yellow crumb is not completely or fully soluble at this stage.
  • the cellulose xanthate solution or suspension has such a high viscosity, it is typically termed the “viscose.”
  • the viscose is allowed to stand for a period of time to "ripen.” During ripening, two important chemical processes occur: redistribution and loss of xanthate groups.
  • the viscose is filtered to remove undissolved or undispersed materials that might disrupt the spimiing process or cause defects in the rayon filament.
  • this "filtering" step is properly controlled, e.g., by using suitable filter sizes, so that the added PTFE particles are not filtered out of the viscose.
  • the viscose may be degassed, i.e. bubbles of air entrapped in the viscose may removed, prior to extrusion to avoid air- oids or weak spots in the fine rayon filaments.
  • the aged and degassed viscose can be used as feed to spinnerets for solution spinning fine filaments of PTFE-enhanced rayon.
  • the viscose may be forced through a spinneret, which may be a device resembling a shower head with a plurality of small diameter channels or holes, into a wet chemical bath.
  • the aqueous dispersion of highly dispersible PTFE may be conveniently added to the viscose as the viscose is about to enter the spinneret. Each hole of the spimieret generates a fine filament of the viscose.
  • the viscose exits the spinneret as filaments it comes in contact with the chemicals in the wet chemical bath.
  • These chemicals may be a solution containing sulfuric acid, sodium sulfate, and usually Zn +2 ions.
  • Several processes may occur at this point, which cause the cellulose in the filaments to be regenerated and to precipitate from the solution. For example, water diffuses out from the extruded viscose to increase the concentration in the filament beyond the limit of solubility.
  • the xanthate groups in the filaments form complexes with the Zn +2 ions, which draw the cellulose chains together.
  • the acidic spin bath converts the xanthate functions into unstable xantheic acid groups, which spontaneously lose CS 2 and regenerate the free hydroxyls of cellulose.
  • the result is the formation of PTFE-enhanced fine filaments of cellulose, or rayon.
  • the filaments may be stretched while the internal cellulose molecular chains remain relatively immobile. This may cause causes the molecular chains to stretch out and to orient along the axis of the filaments giving them attributes necessary for use as textile fibers.
  • the PTFE-enhanced rayon fibers are then washed to remove salts and other water-soluble impurities that are present in freshly regenerated rayon.
  • the PTFE- enhanced rayon filaments then may be cut to suitable lengths as necessary for intended use.
  • the group of filaments may be passed through a rotary cutter to provide a fiber, which can be processed in much the same way as a cotton fiber.
  • the PTFE-enhanced solution-spun fibers produced by such a method may then be manufactured into a fabric or a textile.
  • Such fabric or textile may have the enhanced properties typically associated with the addition of PTFE to articles.
  • the fabric or textile may exhibit a significantly decreased coefficient of friction, which can be an advantageous property of fabrics or textiles that are intended for apparel used in sports or recreational activities.
  • Other advantageous properties of the solution-spun fibers of the present invention include the exceptional wear resistance exhibited by the PTFE-enhanced fibers.
  • the solution-spun fibers and/or the fabrics made from the fibers of the present invention may be wear tested to determine the wear resistance of the fibers.
  • the wear testing may include Taber testing, Mace testing, and Pilling tests.
  • tests may be performed to determine the tenacity of the fabric, the elongation of the fabric, and the draw.
  • the same full range of tests that are commonly used to analyze the properties of solution -spun fibers in the industry may be employed to test the fibers of the present invention.
  • Tests used in other industries and other scientific test methods can also be used to characterize the fibers and fabrics of the present invention.
  • the method and compositions of the present invention may be better understood through the working Examples detailed below. These Examples are intended to illustrate the invention and should not be construed as limiting the invention in any way.
  • PTFE-enhanced rayon fibers were made according to the method of the present invention for comparison with conventional rayon fibers. Specifically in this Example, three types of cellulose were tested initially to determine their suitability for making rayon: cosmetic cotton balls that are available in drug stores, and two types of wood cellulose products. Samples of all three cellulose types were steeped. After both of the wood cellulose pulp samples were steeped, they gave out undesirable brown-colored matter probably because of the presence of lignin, hemicelluloses and other short-chain carbohydrates. Conversely, the initial testing of the cosmetic cotton balls resulted in a clean, orange- colored cellulose xanthate solution having the requisite high viscosity.
  • Example 2 Another 1 gram of the shredded cellulose (“Sample 2”) was wet with 5 ml of an aqueous dispersion of submicron PTFE in a beaker.
  • the specific the PTFE used in this Example was a PTFE product that is commercially available from assignee Shamrock Technologies, hie. under the trade name "NanoFLON W50C.”
  • 50 mL of a 15% sodium hydroxide solution was then added to Sample 2 under continuous stirring.
  • the Sample 2 mixture was also allowed to steep for one hour. Visual observations of the Sample 2 mixture revealed that the steeped mixture had the appearance of "white crumb” in cloudy liquid, which is consistent with the formation of a soda cellulose/PTFE mixture.
  • Sample 1 resulted in a bright orange viscose solution, hi contrast, Sample 2 resulted in a faint orange solution.
  • the two viscoses produced from Samples 1 and 2 were allowed to stand for one hour to "ripen,” and loose bubbles (that may have been introduced into each viscose by stirring) were removed by degassing.
  • the Sample 1 and 2 viscoses were then subject to a laboratory simulation of solution spinning. Specifically, a disposable syringe having a 1 mm diameter needle hole was used to simulate the functions of a spinneret that may be used in commercial equipment for spinning rayon filaments.
  • the Sample 1 viscose was forced through the syringe into an acidic wet bath to regenerate or produce a rayon filament. Specifically, the solution in this acidic bath contained 20% H 2 SO (sulfuric acid), 10% Na 2 SO 4 (sodium sulfate), and 10% ZnCl 2 (zinc chloride).
  • the Sample 2 viscose also was forced through the syringe into a similar acidic bath to produce a PTFE-enhanced rayon filament.
  • Both rayon filaments were then analyzed using multiple laboratory analytical techniques.
  • the filaments were analyzed using Fourier Transform Infrared Spectroscopy (FTIR).
  • FTIR Fourier Transform Infrared Spectroscopy
  • the FTLR spectra confirmed that the two laboratory produced filaments were indeed rayon.
  • the FTIR spectra of the PTFE- enhanced rayon filament (Sample 2) did not show any distinctive PTFE peaks.
  • the rayon filaments were analyzed using differential scanning calorimetry (DSC).
  • DSC differential scanning calorimetry
  • the DSC curves for the PTFE-enhanced rayon filament (Sample 2) showed small peaks corresponding to the presence of PTFE. Small peaks were observed at 328.6°C at first heat and at 329.7°C at second heat.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Textile Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Artificial Filaments (AREA)
  • Woven Fabrics (AREA)

Abstract

L'invention concerne un procédé de production de fibres filées en solution, présentant un moindre coefficient de frottement et d'autres propriétés améliorées, telles que la résistance à l'usure et analogues, comparativement aux fibres filées en solution conventionnelles. Selon le procédé de l'invention, du polytétrafluoroéthylène (PTFE) est incorporé dans la substance formant les fibres durant le processus de filage en solution, avant le passage à la filière. Le PTFE utilisé dans l'invention comprend de la poudre de PTFE dispersible en une faible granulométrie, de l'ordre du micron ou du sous-micron, et des dispersions aqueuses ou organiques d'une telle poudre de PTFE hautement dispersible. L'invention concerne également des tissus, des produits textiles et autres articles manufacturés fabriqués à partir de fibres filées en solution, améliorées au PTFE selon l'invention.
EP03770620A 2002-10-01 2003-10-01 Procede de fabrication de fibres cellulosiques renfermant du ptfe Withdrawn EP1549788A4 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US41500502P 2002-10-01 2002-10-01
US415005P 2002-10-01
PCT/US2003/031263 WO2004031458A1 (fr) 2002-10-01 2003-10-01 Procede de fabrication de fibres cellulosiques renfermant du ptfe

Publications (2)

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EP1549788A1 EP1549788A1 (fr) 2005-07-06
EP1549788A4 true EP1549788A4 (fr) 2006-05-31

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Country Status (7)

Country Link
US (1) US20060134414A1 (fr)
EP (1) EP1549788A4 (fr)
JP (1) JP2006501380A (fr)
AU (1) AU2003279110A1 (fr)
CA (1) CA2501026C (fr)
HK (1) HK1085518A1 (fr)
WO (1) WO2004031458A1 (fr)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004067608A2 (fr) 2003-01-27 2004-08-12 Shamrock Technologies, Inc. Procede de production de poudre de polytetrafluoroethylene submicronique et produits associes
JP2008175971A (ja) * 2007-01-17 2008-07-31 Shin Nisseki Ekisho Film Kk ラビング方法
GB0702795D0 (en) 2007-02-13 2007-03-28 Whitford Plastics Ltd Process for modifying cellulose
JP2010519422A (ja) * 2007-02-26 2010-06-03 コーロン ファッション マテリアル アイ エヌ シー 耐久性に優れた熱可塑性繊維及びこれを含む布
US8690964B2 (en) * 2011-10-11 2014-04-08 The Sweet Living Group, LLC Fabric having ultraviolet radiation protection
US9611086B2 (en) * 2011-11-11 2017-04-04 Hinson & Hale Medical Technologies, Inc. Reusable surgical wrappers
WO2015057783A1 (fr) 2013-10-17 2015-04-23 Rudinger Richard F Fibre synthétique artificielle polymère post-extrudée à polytétrafluoroéthylène (ptfe)
US9469923B2 (en) 2013-10-17 2016-10-18 Richard F. Rudinger Post-extruded polymeric man-made synthetic fiber with copper
US10676861B1 (en) * 2019-11-08 2020-06-09 The Sweet Living Group, LLC Method for incorporating ultraviolet radiation protection and antimicrobial protection into rayon
US20210268725A1 (en) 2020-03-02 2021-09-02 Honeywell Federal Manufacturing & Technologies, Llc Additively manufacturing fluorine-containing polymers
CN115506043B (zh) * 2022-09-14 2023-07-18 顾榴俊 一种ptfe纤维的制备方法

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2121069A (en) * 1982-05-17 1983-12-14 Chemiefaser Lenzing Ag Cellulose-based fibres for the production of non-wovens

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2951047A (en) * 1956-12-24 1960-08-30 Du Pont Preparation of filaments from polytetrafluoroethylene emulsions
US3118846A (en) * 1956-12-24 1964-01-21 Du Pont Composition comprising tetrafluoroethylene polymer and cellulose ester and process for preparing shaped articles therefrom
US3148234A (en) * 1956-12-24 1964-09-08 Du Pont Method of preparing filaments containing polytetrafluoroethylene emulsions
US3147323A (en) * 1956-12-24 1964-09-01 Du Pont Method of preparation of filaments from polytetrafluoroethylene emulsion
US3670069A (en) * 1969-09-15 1972-06-13 Itt Process for forming hydroxyethyl cellulose fibers having high water absorption and high water retention properties
US3655853A (en) * 1970-08-10 1972-04-11 Du Pont Process for producing polytetrafluoroethylene filaments
IT1192247B (it) * 1978-02-24 1988-03-31 Snia Viscosa Procedimento per la preparazione di derivati della cellulosa coagulabili e filabili con rigenerazione della cellulosa stessa
US4340559A (en) * 1980-10-31 1982-07-20 E. I. Du Pont De Nemours And Company Spinning process
US4888122A (en) * 1986-11-24 1989-12-19 Mccready David F Engine oil additive dry lubricant powder
US5181268A (en) * 1991-08-12 1993-01-19 Corning Incorporated Strippable tight buffered optical waveguide fiber
US5762846A (en) * 1996-12-20 1998-06-09 E. I. Du Pont De Nemours And Company Dispersion spinning process for polytetrafluoroethylene and related polymers
US6274254B1 (en) * 1999-08-23 2001-08-14 Lucent Technologies Inc. Electrodeposited precious metal finishes having wear resistant particles therein
AU2003269802A1 (en) * 2002-03-14 2003-12-31 Shamrock Technologies, Inc. Methods for producing submicron polytetrafluoroethylene powder and products thereof

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2121069A (en) * 1982-05-17 1983-12-14 Chemiefaser Lenzing Ag Cellulose-based fibres for the production of non-wovens

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HK1085518A1 (zh) 2006-08-25
CA2501026A1 (fr) 2004-04-15
CA2501026C (fr) 2008-12-30
US20060134414A1 (en) 2006-06-22
EP1549788A1 (fr) 2005-07-06
WO2004031458A1 (fr) 2004-04-15
AU2003279110A1 (en) 2004-04-23

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