CA2105044C - Method for preparation of heat insulating synthetic fiber - Google Patents
Method for preparation of heat insulating synthetic fiberInfo
- Publication number
- CA2105044C CA2105044C CA002105044A CA2105044A CA2105044C CA 2105044 C CA2105044 C CA 2105044C CA 002105044 A CA002105044 A CA 002105044A CA 2105044 A CA2105044 A CA 2105044A CA 2105044 C CA2105044 C CA 2105044C
- Authority
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- Canada
- Prior art keywords
- synthetic fiber
- prepared
- particles
- ferrite
- fiber
- 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.)
- Expired - Fee Related
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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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Textile Engineering (AREA)
- Artificial Filaments (AREA)
- Chemical Or Physical Treatment Of Fibers (AREA)
Abstract
A method for preparation of a synthetic fiber of a good heat insulation. In this method, the synthetic fiber is impregnated with ferrite particles in a step of a conventional synthetic fiber preparation process. The ferrite particles, having an average particle size of 0.1 - 10 µm and selected from the group of Co-Fe, Cu-Zn-Fe, Ba-Fe, Sr-Fe, Ni-Fe, Ni-Zn-Fe, Mn-Zn-Fe and Mn-Mg-Fe, are added to the synthetic fiber in an amount of 0.5 - 60 % by the weight of the synthetic fiber.
The synthetic fiber is selected from the group of polyolefin, polyamide, polyester and polyacrylic fibers. The present invention provides a synthetic fiber showing a good heat insulating effect regardless of outside conditions, such as using place, using weather and outside energy source.
The synthetic fiber is selected from the group of polyolefin, polyamide, polyester and polyacrylic fibers. The present invention provides a synthetic fiber showing a good heat insulating effect regardless of outside conditions, such as using place, using weather and outside energy source.
Description
21050~
METHOD FOR PREPARATION OF HEAT INSULATING S'~NTHETIC FIBER
BACKGROUND OF THE INVENTION
Field of the Invention The present invention relates in general to a synthetic fiber of an excellent heat insulation, and more particularly to a preparation of s~ch a heat insulating synthetic fiber by adding metallic compound particles to a polymer in the synthetic fiber preparation process.
Description of the Prior Art It has been noted that a known synthetic fiber sho~s a bad heat insulation and the clothes manufactured usins the synthetic fibers do not exhibit enough heat insulating effect for used as arctic clothes, such as cold storage warehcuse working clothes and a ski suit. In order to overcome such a fault of the known synthetic fiber clothes, there have been proposed several methods for supplement of heat -insulating effect to the esulting clothes by causing air to be stagnant between human body and the clothes. For example, the sonventional synthetic fibers may be combined with natural fibers of low heat conductivity, such as wool, in preparation o~ fabric structure. Also, the synthetic fibers may be closely woven or knitted into a close-structural cloth. ~hP
,, supplement of heat insulation may be achieved by coating an insulating material on the synthetic fiber cloth. These methods provide somewhat improved insulating effect, but ha~e a problem in providing ~he clothes with suf f i c i ent heat insulating effect which can be used as the arctic clothes, therefore, many efforts to improve the insulating effect more perfectly and basically are continued.
Japanese Patent Laid-open Publication No. Heisei 1-132~16 discloses a technique for improving the heat insulating effect of the synthetic fiber by selective absorption of the sun light and radiation of far infrared rays converted from the absorbed sun light. In this Japanese patent, particles selected from the group IV~ of the periodic table, such as zirconium carbides, are added to a synthetic fiber, such as polyester or polyamide fiber, in order to prepare a synthetic fiber impregnated with the particles. In this fiber, the particles perform the selective absorption ar.d ccn~ersivn 5i-the sun lignt to electromagnelic wa~fe which haYe relatively lcnser ~-~â~elength qnd radiate this converted far infrared rays. In addition, ~apanese Patent laid-open Public.ation No.
Shc. 63-~2720 discloses another technique for improving the heat insulâtins effect of the synthetic fibers. In this Japanese patent, particl es of alumina, zirconia and ~agnesia ~re added to the synthetic fibers to absorb the far infrared rays emitted from the human body and to radiate the far ' 21050~4 infrared rays absorbed to the human body.
However, the technique disclosed in the Japànese patent, No. 1-132816, has a disadvantage in that the resulting clothes, while showing somewhat improved heat insulating effect when used in the sun light, nevertheless remarkab7y reduce in their heat insulating effect particularly when they are used under the condition that there is no outside energy source, or the s~n light, such as when used indoors or under a bad weather. Another disadvantage of this technique is resided in that the transition metal carbides, used as the additives, are very expensive and involve capital investment.
On the other hand, the technique disclosed in the Japanese patent, No. 63-9272Q, can be efficiently adapted to preparation of indoor clothes, such as night clothes, nevertheless it has a disadvantage in that it is not adapted to preparation of arctic working clothes and winter sport wears since it can not provide the sufficient heat-insulation required for outside use.
SUMMA~Y OF THE INYENTION
It is, therefore, an object of the present invention to provide a method for preparation of a synthetic fiber of a good heat insulation in which the aforementioned disadvantages can be overcome and which provides a synthetic fiber showing 210504~ _ a good heat insulating effect regardless of environmental conditions, such as weather, place and the presence of energy source.
In order to accomplish the above and other objects, the present invention provides a method comprising the s~ep or impregnating a synthetic fiber with ferrite particles, selected from the group of Co-Fe, Cu-Zn-Fel Ba-Fe, Sr-Fe, Ni-Fe, Ni-Zn-Fe, Mn-Zn-Fe and Mn-Mg-Fe, in any step of a conventional synthetic fiber preparation process while tO controlling the average particle size of the ferrite particles.
The ferrite particles used in this invention preferably have an average pArticle size of 0.1 - 10 ~m and are preferably added to the synthetic fiher in an amount of 0.5 -60 ~ by the weight cf the synthetic fiber.
The present invention is started from the fact that the ,errite, a baked materia' of a trânsitisn metal oxide mi,~t~rs includins the chief ingredient of ferritiG oxide, has been widely used as a masretic sore and an electromagne~ir wa~fe absorbent, shows an e~cellent absGrptive power for a radio wave ar,d a ~icrswave of electromagnetic wave, both having a re?at-vely longer wavelength, as well as an excellent aoscr~t~ve power fGr visible rays and infrared rays having a relatively shorter wavelength, and emits a thermal ener~y o~
relatively longer wavelength while the absorbod ~- 21050~
electromagnetic wave excites the molecular level SG as to return to its stability.
DETAILED DESCRIPTION OF THE INVENTION
The ferrites used in the present invention are generally classified into three types, that is, a hard type ferrite, a soft type ferrite and a ferrite for recording. The hard type ferrite is selected from the grcup of Co-Fe, Cu-Zn-Fe, Ba-Fe, Sr-Fe and etc.. The soft ferrite is selected from the group of Ni-Fe, Ni-Zn-Fe, Mn-Zn-Fe, Mn-Mg-Fe and etc., and further classified into three types, that is, a Spinel type ferrite, a high density ferrite and a Garnet type ferrite and another type is ~-Fe20~ used for recording media.
The particle size of the ferri~e used in this invention is ranged from 0.1 ~m to 10 ~m in accordance with size li~its of particle in fiber manufacturing. In the case of addition of ferrite particles of smaller than 0.1 ~m particle size, the specitic surface area of the particles increases and the interval between the particles is reduced. This ~enerates interparticular aggregation in the synthetic fiber, thereby causing increase of the spinning pres-sure as well as deterioration of the reeling workability. On the contrary, addition of ferrite particles of larger than 10 ~m particle ~5 size results in deterioration of reeling workability and, 210~4 furthermore, causes fiber snapping.
In the present invention, the ferrite particles are added to the synthetic fiber in an amount of 0.5 ~ - 60 ~ by the weight of the synthetic fiber. ~ere, addition of ferrite ~articles of less than 0.5 weight % is not su-fflcient for pro~ision of required heat insulating effect for the resulting fiber, whilst addition of excessive ferrite particles of more than 60 ~eight % results in deterioration of sDinning workability as well as difficulty of thread formation.
The present invention uses conventional commercialized syntnetic high polymers, such as low density pclyethylene, high density polyethylene, crosslinked polyethylene, ~olypropylene, nylon 6, nylon 6~, nylon 11, nylon 12, copolym~r of nylon 610, nylon 612 and polyethylene, polyethylene terephthalate, polybutylene terephthalate, pslyvinyl chlcride, polyvinyl alcchGl, polyacrylonitrile and pclyaci~y ic -~cid ester.
In the present invention, the impresnatiGn of f-_rrite ~articl-~s -to the synthetic fiber is achieved ~y em~l~yin3 a ~0 conventional method. Otherwise srated, the ferrite ~artisles may be added to the high pslymer during the ~o ymeri~ation ,tep, cr pel?eti.ed lnto ma~terbatch prior to ~lendi~g ~ith the b~se cclymer. Alsc, these ferrite ~articles may be di-ectly adde~ tc the synthetic fiber durln~ dry~ ~et or melt ~5 s~inning ste~ of the s~nthetic fi~er.
- 210504~
In preparatlon of the synthetic fiber according to the present invention, it is preferred to add conventional modifiers and additives, such as dispersing agents, antioxidants, thermal stability agents, flame retardants, coloring agents, antibacterial agents and ultraviolet absorbers.
The spinning of the synthetic fiber of the present invention may be achieved by using a conventional spinning nozzle. In addition, the resulting fiber of this invention may be formed in circular, triangular or elliptic cross-section. Also, it is possible to use a concentric sheath/core type or eccentric sheath/core type conjugate no~zle.
The synthetic fiber according t~ the present invention may be manuf~ctured in the form of a filament, a staple fiber, a raw yarn of a non-woven fabric or an industrial raw yarn.
The fcllowins examples and comparative examples are merely intended to illustrate the present invention in further detail and should by no means be considered to limitative of ~0 the scope of the inYention.
The preparation of pellets impregnated with the ferrite ~5 particles was achieved by mixing polyethylene terephthalate .
21050~4 pellet with Mn-Zn group ferrite particles of 0.5 %, 10 % and 60 % by the weight of the polyethylene terephthalate pellet, respectively. Each of the polyethylene terephthalate pellets (hereinafter, referred to~simply as "the A pellet"~ had a 5 specific viscosify of 0.63 and was conventionally prepared using terephthalic acid and ethylene glycol. The Mn-~n group ferrite particles (hereinbelow, referred to simply as "the B
particles") had an a~eraae particle size of o.l ~m and were prepared by pulverizing and classification employing a current jet pulverizer as well as a turbo classifier (~oth being man~factured by Nishin o~ Japan, Model Nos. CJ-10 and TN-25~.
The mixing of the raw materials was carried out by a twin extruder at a temperature of 2~0 ~C. Tn this twin extruder, the result mixture was also molten prior to its extrusion.
The strand extruded was then conventionally _ut, thereby preparir,g each pellet impregnat~d with the ferrite particles.
This resu.ting pelle-i- was, .h,~reafter, c~nv~n'~.onâll,.
dried and the spinnin~ was c2rried a~ 2a~ 'C b~ emp'.cyirlg a concentri~ shea h~ccre type conjugate ~p-.nnir,~ no~-le. The result~ng fiber was wound at a windins speed or 1,2~C m~min tG
prcpare ~n unstretched yarn vf 240d~36f. Ther" th,is unsfretched yarn W2S drawn with the ~raw ratis a.2 to prepare a fully draw varn ~f 75d~'3~f. Thereaf~er, a plain ~c~en f.~bric, ha~ins a longitudinal yarn density 3f 150 pieces~inch as well 2S a lateral yarn density -f 11~ pieces~inch, ~âS
a 21 05~
prepared as a result of plain weaving using a conventional polyester false twist yarn of 75d/36f as the longitudinal yarn and each of the resulting fully draw yarns as the lateral yarn.
The physical properties of each of the prepared fully draw yarns and the result of the heat insulation test of the resulting plain woven fabric prepared are given in Tabl~ 1.
The procedures of Examples I to 3 were repeated, substituting average particle size of 1 ~m of the B particles for the size of 0.1 ~m. The physical properties of each of the prepared fully draw yarns and the result of the heat insulation test of the resulting plain woven fabric prepared are given in Table 1.
~G The procedures of Examples 1 to 3 were repeated, substituting average particle size of ~ ~m of the B particles for the si~e of 0.1 ~m. The physical properties of each of the prépared fully draw yarns and the result of the heat insulation test of the resulting plain woven fabric prepared are given in Table 1.
g 210504~ -The procedures of Examp7es I to 3 were repeated, substitutins average particle size o-f 10 ~m of the i3 particles 5 ,or the size of 0.~ ~m. The physical properties cf each o,~
the prepared f~lly draw yarn~ and the result of the heat insulat-iGn test of the resulting plain woven fabric prepared are given in Table 1.
COMPARATIVE EXAMPLES l - 2 The procedure of Example 1 was repeated, substituting a~ferage particle size of O.G5 ~m af the ~ particles for the size of 0.1 ~m, and substituting 0,1 weight % and 5~ weight %
of the B particles for the amount of 0. ~ weight %~ The physical properties of each of ~he prepared -fu71y diraw yarrs ana the r-sul., c,~ ~he heat insulation test ~r the resulitiig p7a~ wcven ,~abrFc prepared are given in Table l.
CC!MPARATI'lE EXAMPbES 3 - 4 The procedure of Example l was repeated, s~ks~1ti~tina average par icle size Gf 2C ~m Gf ~he ~ part1cles f~r the si_e cf C.l ~m, and substituting 0.1 weight ~0 and 6~ weigh ~ of the B particles for the amount Gf 0. ~ weight ~. The physical ~ O
210S04~
properties of each of the prepared fully draw yarns and the result of the heat insulation test of the resulting plain woven fabric prepared are given in Table 1.
The procedure of Example 1 was repeated, using no ferrite par~icle. The physical properties of the prepared fully draw yarn and the result of the heat insulation test of the resulting plain woven fabric prepared are given in Table 1.
Conventionall~ prepared nylon 6 pellet having a relative viscosity of 2.85 was mixed with 1G weight % of a Mn-Mg group ferrite particles ~the B particles) having an average particle size of 0 5 ~m. The resulting mixture was in turn molten and extruded, thereby preparing a pellet impregnated with the ferrite particles.
This pellet was, thereafter, spun at a spinning temperature of 260 ~C and at a spinning speed of 800 m/min, and cooled and solidified employing a cooling air of a temperature of l9 ~C and a blowing speed of O.G4 m/min, thereby preparing an unstretched yarn. This unstretched yarn was in turn conventionally drawn to prepare a nylon fiber of ~ 210504~ _ 7Odt24f.
This resulting nylon fiber was conventionally woven in order to prepare a fabric. The physical properties of the prepared fully draw yarn an~ the result of the heat insulation test of the resulting ,abrlc prepared ~re given 1n Table 2 The procedure of E~ample 13 was repeated, using no ferrite particle. The physical properties of the prepared full~ draw yarn and the result of the heat insulation test of the resulting fabric prepared are g-iven in Table 2.
A polypropylene pelle-5 having a melt inde~ of 25 and a n&lGcular -w_i~ht ~ str,~tion (~hD~) or ~ ~ was mixe~ h 1 weight a~ Oi a Ni-Zn group ferrlte particles ~the ~ particlesj ha~ng an a~erage particle size o,~ ~ m. The resultirg mi~tur2 was in turn ~olt_n ard extruded, ~hereby preparing a pellet impregnated wi~h the ,errite parti~les.
Ther~after, this pellst was spun at a scr~w melt part tcmperatUr~ Ot 27~ .ni a sp-nr,ing no zle temperature af 2~5 ac by empl~ying a spinning nozzle. This nczzle had 20 ~5 spirning holes each of which had a diameter (D~ of 0.3 ~m and 1 ~
210504~
a ratio (L/D) of its length (L) to its diameter (D3 of ~. The resulting fiber was in turn wound at a winding speed of 2,000 m~min while being solidified by a room temperature cooling air of 0.2 m/sec. This fiber was in turn drawn at a draw r~tio cf 1 6, thereby preparing a fully draw yarn of 65d/20f.
This resulting fully draw yarn was conventionally woven in order to prepare a fabric. The physical properties of the prepared fully draw yarn and the result of the heat insulatiGn test of the resulting fabric prepared are given in Table 2.
The procedure of Example l~ was repeated, using no ferrite par~icle. The physical properties of the prepared t5 fully draw yarn and the result of the heat insulation test of the resulting fabric prepared are given in Table 2.
~0 1~ 9 of acrylonitrile was added to a nitric acid (70 %) and sufficiently stirred up to prepare a uniform solution.
The resulting solution was mixed with 10 weight % of Mn-2n ~roup ferrite particles (the ~ particles) havins an average particle size of Q.5 ~m and in turn sufficiently stirred up 21050~
and defoamed to prepare a spinning hish po1ymer solution.
Thereafter, this resulting solution was spun at a spinning speed of 4 m/min by employing a spinning no~zle provided with 10Q spinnins hcles af a diameter (~) _f 0.13 mm, ther-b~
prepared an acrylic fiber. At this time, the spinning temperature was - 5 ~C and the coagulation was carried GUt in 30 ~ nitric acid.
T~is resultinq acrylic fiber was con~ent onally wsi~Jeri ~ n order to prepare a fabric. The physical properties of -the prepared fully draw yarn and the result of ~he heat insulation test of the resulting fabric prepared are siven in Table 2.
The procedure of Example 15 was repeated, usin~ no ferri e ?article. The physical properties of t.he preparcd fu ' ly ;~'2'N yarn and the result oF the heat in~ulat-on t-ct ~-~
~he resulting fabric prepared are given in T~ble 2.
21050~
B~A* Size* Fully ~raw Yarns Fabrics Ex.Nos.
wt% ~m Strength* Elong.* Heat Ins~l.*
Ex. 1 0.5 0.1 4.5 25 35.0 E,Y. 210.0 0.1 4.0 27 40.0 Ex. 3 60.0 0.1 3.2 33 48.0 Ex. 4 0.5 1.0 4.2 22 36.0 Ex. 5 10.0 l.0 3.8 25 41.2 Ex. 6 60.0 1.0 3.0 30 50.2 Ex. 7 0.5 5.0 4.0 20 34.0 Ex. 8 10.0 5.0 3.7 22 38.2 Ex. 9 60.0 5.0 3.0 28 45.3 Ex. 10 0.5 1Q.0 3.~ 2Q 33.8 Ex. 1110.0 10.0 3.5 22 37.5 Ex. 1260.0 10.0 2.9 25 43.3 Co.Ex.1 0.1 O.C5 Co.Ex.265.0 0.05 Co.Ex.3 0.1 20.0 Co.Ex.465.0 20.0 - - -CG.Ex.5 ~ 4.7 35 32.0 In Tab1e 1:
B/A* : mi~ing amount of the ferrite particles by the weight of polyethylene terephthalate Size* : average particle size of the ferrite particles 21050~
Strength* : tensile strength of the fully draw yarn (g~d) Elong.* : Elongation of the fully draw yarn (%) Heat Insul.* : heat insulation of the fabric (CC) B/A* Fully Draw Yarns Fabrics EX.NOS. PG1 ymers wt% Strength* Elong.* Heat Insul.*
EX. 13 10.0 nY1On 6 4.3 40 42.0 Co.Ex. 6 0.0 nylon 6 4.6 44 34.0 Ex. 1410.0 PG1YPrOPY1ene 4.5 41 43.~
Co.Ex. 70.0 polypropylene 4.9 45 35.0 Ex. 1510.0 acryl* 3.2 30 46.3 Co.Ex. 80.0 acryl* 3.4 33 35.7 In table 2:
B/A* : mixing amount of the ferrite particles ~y the weight of polymer Strength* : tensile strength of the fully draw yarn (g~d~
Elong.* : Elongation of the fully draw yarn ( Heat Insul.* : heat insulation of the fabric ~'C~
acryl* : acrylonitrile Measurement of Tensile Stren~th and Elon~aticn In order to measure the strengths and the elongations of the fully draw yarns of the Examples and the Comparative '~
Examples, each of the fully draw yarns was measured in its tensile strain according to variation of the lohd as well as in its tensile strength and elongation at the tensil failure by employing an universal testing machine (manufactured ~y Instron, Model No. 4301). At this time, the measurement was carried out under the condition of a specimen lensth cf 200 mm, a tension speed of 200 mm/min and a tensile load of 2 kg.
~eGsurement of Heat Insulation In order to measure the heat insulations of the resultin3 ,abrics o; the Examples and the Comparative Examples, each of the prepared fabrics, that is, a fabric impresnated with the ferrite particles or with no ferrite particle, was prepared in the form of a specimen of ~ x 10 cm2. The prepared specimen was in turn subjected to irradiation of a high efficient re,~lection lamp having l ~m center wavelength and ~00 W pcwer in a constant temperature r~om, and measured in the average ~e~peraturQ distribution on its surface by employins the Thermo Tracer*6T62, manufactured by NEC San-ei.
The present invention has been described in detail with particular reference to preferred embodiments thereof, but it will be understood that variations and modifications can be efTected within the spirit and scope of the invention.
METHOD FOR PREPARATION OF HEAT INSULATING S'~NTHETIC FIBER
BACKGROUND OF THE INVENTION
Field of the Invention The present invention relates in general to a synthetic fiber of an excellent heat insulation, and more particularly to a preparation of s~ch a heat insulating synthetic fiber by adding metallic compound particles to a polymer in the synthetic fiber preparation process.
Description of the Prior Art It has been noted that a known synthetic fiber sho~s a bad heat insulation and the clothes manufactured usins the synthetic fibers do not exhibit enough heat insulating effect for used as arctic clothes, such as cold storage warehcuse working clothes and a ski suit. In order to overcome such a fault of the known synthetic fiber clothes, there have been proposed several methods for supplement of heat -insulating effect to the esulting clothes by causing air to be stagnant between human body and the clothes. For example, the sonventional synthetic fibers may be combined with natural fibers of low heat conductivity, such as wool, in preparation o~ fabric structure. Also, the synthetic fibers may be closely woven or knitted into a close-structural cloth. ~hP
,, supplement of heat insulation may be achieved by coating an insulating material on the synthetic fiber cloth. These methods provide somewhat improved insulating effect, but ha~e a problem in providing ~he clothes with suf f i c i ent heat insulating effect which can be used as the arctic clothes, therefore, many efforts to improve the insulating effect more perfectly and basically are continued.
Japanese Patent Laid-open Publication No. Heisei 1-132~16 discloses a technique for improving the heat insulating effect of the synthetic fiber by selective absorption of the sun light and radiation of far infrared rays converted from the absorbed sun light. In this Japanese patent, particles selected from the group IV~ of the periodic table, such as zirconium carbides, are added to a synthetic fiber, such as polyester or polyamide fiber, in order to prepare a synthetic fiber impregnated with the particles. In this fiber, the particles perform the selective absorption ar.d ccn~ersivn 5i-the sun lignt to electromagnelic wa~fe which haYe relatively lcnser ~-~â~elength qnd radiate this converted far infrared rays. In addition, ~apanese Patent laid-open Public.ation No.
Shc. 63-~2720 discloses another technique for improving the heat insulâtins effect of the synthetic fibers. In this Japanese patent, particl es of alumina, zirconia and ~agnesia ~re added to the synthetic fibers to absorb the far infrared rays emitted from the human body and to radiate the far ' 21050~4 infrared rays absorbed to the human body.
However, the technique disclosed in the Japànese patent, No. 1-132816, has a disadvantage in that the resulting clothes, while showing somewhat improved heat insulating effect when used in the sun light, nevertheless remarkab7y reduce in their heat insulating effect particularly when they are used under the condition that there is no outside energy source, or the s~n light, such as when used indoors or under a bad weather. Another disadvantage of this technique is resided in that the transition metal carbides, used as the additives, are very expensive and involve capital investment.
On the other hand, the technique disclosed in the Japanese patent, No. 63-9272Q, can be efficiently adapted to preparation of indoor clothes, such as night clothes, nevertheless it has a disadvantage in that it is not adapted to preparation of arctic working clothes and winter sport wears since it can not provide the sufficient heat-insulation required for outside use.
SUMMA~Y OF THE INYENTION
It is, therefore, an object of the present invention to provide a method for preparation of a synthetic fiber of a good heat insulation in which the aforementioned disadvantages can be overcome and which provides a synthetic fiber showing 210504~ _ a good heat insulating effect regardless of environmental conditions, such as weather, place and the presence of energy source.
In order to accomplish the above and other objects, the present invention provides a method comprising the s~ep or impregnating a synthetic fiber with ferrite particles, selected from the group of Co-Fe, Cu-Zn-Fel Ba-Fe, Sr-Fe, Ni-Fe, Ni-Zn-Fe, Mn-Zn-Fe and Mn-Mg-Fe, in any step of a conventional synthetic fiber preparation process while tO controlling the average particle size of the ferrite particles.
The ferrite particles used in this invention preferably have an average pArticle size of 0.1 - 10 ~m and are preferably added to the synthetic fiher in an amount of 0.5 -60 ~ by the weight cf the synthetic fiber.
The present invention is started from the fact that the ,errite, a baked materia' of a trânsitisn metal oxide mi,~t~rs includins the chief ingredient of ferritiG oxide, has been widely used as a masretic sore and an electromagne~ir wa~fe absorbent, shows an e~cellent absGrptive power for a radio wave ar,d a ~icrswave of electromagnetic wave, both having a re?at-vely longer wavelength, as well as an excellent aoscr~t~ve power fGr visible rays and infrared rays having a relatively shorter wavelength, and emits a thermal ener~y o~
relatively longer wavelength while the absorbod ~- 21050~
electromagnetic wave excites the molecular level SG as to return to its stability.
DETAILED DESCRIPTION OF THE INVENTION
The ferrites used in the present invention are generally classified into three types, that is, a hard type ferrite, a soft type ferrite and a ferrite for recording. The hard type ferrite is selected from the grcup of Co-Fe, Cu-Zn-Fe, Ba-Fe, Sr-Fe and etc.. The soft ferrite is selected from the group of Ni-Fe, Ni-Zn-Fe, Mn-Zn-Fe, Mn-Mg-Fe and etc., and further classified into three types, that is, a Spinel type ferrite, a high density ferrite and a Garnet type ferrite and another type is ~-Fe20~ used for recording media.
The particle size of the ferri~e used in this invention is ranged from 0.1 ~m to 10 ~m in accordance with size li~its of particle in fiber manufacturing. In the case of addition of ferrite particles of smaller than 0.1 ~m particle size, the specitic surface area of the particles increases and the interval between the particles is reduced. This ~enerates interparticular aggregation in the synthetic fiber, thereby causing increase of the spinning pres-sure as well as deterioration of the reeling workability. On the contrary, addition of ferrite particles of larger than 10 ~m particle ~5 size results in deterioration of reeling workability and, 210~4 furthermore, causes fiber snapping.
In the present invention, the ferrite particles are added to the synthetic fiber in an amount of 0.5 ~ - 60 ~ by the weight of the synthetic fiber. ~ere, addition of ferrite ~articles of less than 0.5 weight % is not su-fflcient for pro~ision of required heat insulating effect for the resulting fiber, whilst addition of excessive ferrite particles of more than 60 ~eight % results in deterioration of sDinning workability as well as difficulty of thread formation.
The present invention uses conventional commercialized syntnetic high polymers, such as low density pclyethylene, high density polyethylene, crosslinked polyethylene, ~olypropylene, nylon 6, nylon 6~, nylon 11, nylon 12, copolym~r of nylon 610, nylon 612 and polyethylene, polyethylene terephthalate, polybutylene terephthalate, pslyvinyl chlcride, polyvinyl alcchGl, polyacrylonitrile and pclyaci~y ic -~cid ester.
In the present invention, the impresnatiGn of f-_rrite ~articl-~s -to the synthetic fiber is achieved ~y em~l~yin3 a ~0 conventional method. Otherwise srated, the ferrite ~artisles may be added to the high pslymer during the ~o ymeri~ation ,tep, cr pel?eti.ed lnto ma~terbatch prior to ~lendi~g ~ith the b~se cclymer. Alsc, these ferrite ~articles may be di-ectly adde~ tc the synthetic fiber durln~ dry~ ~et or melt ~5 s~inning ste~ of the s~nthetic fi~er.
- 210504~
In preparatlon of the synthetic fiber according to the present invention, it is preferred to add conventional modifiers and additives, such as dispersing agents, antioxidants, thermal stability agents, flame retardants, coloring agents, antibacterial agents and ultraviolet absorbers.
The spinning of the synthetic fiber of the present invention may be achieved by using a conventional spinning nozzle. In addition, the resulting fiber of this invention may be formed in circular, triangular or elliptic cross-section. Also, it is possible to use a concentric sheath/core type or eccentric sheath/core type conjugate no~zle.
The synthetic fiber according t~ the present invention may be manuf~ctured in the form of a filament, a staple fiber, a raw yarn of a non-woven fabric or an industrial raw yarn.
The fcllowins examples and comparative examples are merely intended to illustrate the present invention in further detail and should by no means be considered to limitative of ~0 the scope of the inYention.
The preparation of pellets impregnated with the ferrite ~5 particles was achieved by mixing polyethylene terephthalate .
21050~4 pellet with Mn-Zn group ferrite particles of 0.5 %, 10 % and 60 % by the weight of the polyethylene terephthalate pellet, respectively. Each of the polyethylene terephthalate pellets (hereinafter, referred to~simply as "the A pellet"~ had a 5 specific viscosify of 0.63 and was conventionally prepared using terephthalic acid and ethylene glycol. The Mn-~n group ferrite particles (hereinbelow, referred to simply as "the B
particles") had an a~eraae particle size of o.l ~m and were prepared by pulverizing and classification employing a current jet pulverizer as well as a turbo classifier (~oth being man~factured by Nishin o~ Japan, Model Nos. CJ-10 and TN-25~.
The mixing of the raw materials was carried out by a twin extruder at a temperature of 2~0 ~C. Tn this twin extruder, the result mixture was also molten prior to its extrusion.
The strand extruded was then conventionally _ut, thereby preparir,g each pellet impregnat~d with the ferrite particles.
This resu.ting pelle-i- was, .h,~reafter, c~nv~n'~.onâll,.
dried and the spinnin~ was c2rried a~ 2a~ 'C b~ emp'.cyirlg a concentri~ shea h~ccre type conjugate ~p-.nnir,~ no~-le. The result~ng fiber was wound at a windins speed or 1,2~C m~min tG
prcpare ~n unstretched yarn vf 240d~36f. Ther" th,is unsfretched yarn W2S drawn with the ~raw ratis a.2 to prepare a fully draw varn ~f 75d~'3~f. Thereaf~er, a plain ~c~en f.~bric, ha~ins a longitudinal yarn density 3f 150 pieces~inch as well 2S a lateral yarn density -f 11~ pieces~inch, ~âS
a 21 05~
prepared as a result of plain weaving using a conventional polyester false twist yarn of 75d/36f as the longitudinal yarn and each of the resulting fully draw yarns as the lateral yarn.
The physical properties of each of the prepared fully draw yarns and the result of the heat insulation test of the resulting plain woven fabric prepared are given in Tabl~ 1.
The procedures of Examples I to 3 were repeated, substituting average particle size of 1 ~m of the B particles for the size of 0.1 ~m. The physical properties of each of the prepared fully draw yarns and the result of the heat insulation test of the resulting plain woven fabric prepared are given in Table 1.
~G The procedures of Examples 1 to 3 were repeated, substituting average particle size of ~ ~m of the B particles for the si~e of 0.1 ~m. The physical properties of each of the prépared fully draw yarns and the result of the heat insulation test of the resulting plain woven fabric prepared are given in Table 1.
g 210504~ -The procedures of Examp7es I to 3 were repeated, substitutins average particle size o-f 10 ~m of the i3 particles 5 ,or the size of 0.~ ~m. The physical properties cf each o,~
the prepared f~lly draw yarn~ and the result of the heat insulat-iGn test of the resulting plain woven fabric prepared are given in Table 1.
COMPARATIVE EXAMPLES l - 2 The procedure of Example 1 was repeated, substituting a~ferage particle size of O.G5 ~m af the ~ particles for the size of 0.1 ~m, and substituting 0,1 weight % and 5~ weight %
of the B particles for the amount of 0. ~ weight %~ The physical properties of each of ~he prepared -fu71y diraw yarrs ana the r-sul., c,~ ~he heat insulation test ~r the resulitiig p7a~ wcven ,~abrFc prepared are given in Table l.
CC!MPARATI'lE EXAMPbES 3 - 4 The procedure of Example l was repeated, s~ks~1ti~tina average par icle size Gf 2C ~m Gf ~he ~ part1cles f~r the si_e cf C.l ~m, and substituting 0.1 weight ~0 and 6~ weigh ~ of the B particles for the amount Gf 0. ~ weight ~. The physical ~ O
210S04~
properties of each of the prepared fully draw yarns and the result of the heat insulation test of the resulting plain woven fabric prepared are given in Table 1.
The procedure of Example 1 was repeated, using no ferrite par~icle. The physical properties of the prepared fully draw yarn and the result of the heat insulation test of the resulting plain woven fabric prepared are given in Table 1.
Conventionall~ prepared nylon 6 pellet having a relative viscosity of 2.85 was mixed with 1G weight % of a Mn-Mg group ferrite particles ~the B particles) having an average particle size of 0 5 ~m. The resulting mixture was in turn molten and extruded, thereby preparing a pellet impregnated with the ferrite particles.
This pellet was, thereafter, spun at a spinning temperature of 260 ~C and at a spinning speed of 800 m/min, and cooled and solidified employing a cooling air of a temperature of l9 ~C and a blowing speed of O.G4 m/min, thereby preparing an unstretched yarn. This unstretched yarn was in turn conventionally drawn to prepare a nylon fiber of ~ 210504~ _ 7Odt24f.
This resulting nylon fiber was conventionally woven in order to prepare a fabric. The physical properties of the prepared fully draw yarn an~ the result of the heat insulation test of the resulting ,abrlc prepared ~re given 1n Table 2 The procedure of E~ample 13 was repeated, using no ferrite particle. The physical properties of the prepared full~ draw yarn and the result of the heat insulation test of the resulting fabric prepared are g-iven in Table 2.
A polypropylene pelle-5 having a melt inde~ of 25 and a n&lGcular -w_i~ht ~ str,~tion (~hD~) or ~ ~ was mixe~ h 1 weight a~ Oi a Ni-Zn group ferrlte particles ~the ~ particlesj ha~ng an a~erage particle size o,~ ~ m. The resultirg mi~tur2 was in turn ~olt_n ard extruded, ~hereby preparing a pellet impregnated wi~h the ,errite parti~les.
Ther~after, this pellst was spun at a scr~w melt part tcmperatUr~ Ot 27~ .ni a sp-nr,ing no zle temperature af 2~5 ac by empl~ying a spinning nozzle. This nczzle had 20 ~5 spirning holes each of which had a diameter (D~ of 0.3 ~m and 1 ~
210504~
a ratio (L/D) of its length (L) to its diameter (D3 of ~. The resulting fiber was in turn wound at a winding speed of 2,000 m~min while being solidified by a room temperature cooling air of 0.2 m/sec. This fiber was in turn drawn at a draw r~tio cf 1 6, thereby preparing a fully draw yarn of 65d/20f.
This resulting fully draw yarn was conventionally woven in order to prepare a fabric. The physical properties of the prepared fully draw yarn and the result of the heat insulatiGn test of the resulting fabric prepared are given in Table 2.
The procedure of Example l~ was repeated, using no ferrite par~icle. The physical properties of the prepared t5 fully draw yarn and the result of the heat insulation test of the resulting fabric prepared are given in Table 2.
~0 1~ 9 of acrylonitrile was added to a nitric acid (70 %) and sufficiently stirred up to prepare a uniform solution.
The resulting solution was mixed with 10 weight % of Mn-2n ~roup ferrite particles (the ~ particles) havins an average particle size of Q.5 ~m and in turn sufficiently stirred up 21050~
and defoamed to prepare a spinning hish po1ymer solution.
Thereafter, this resulting solution was spun at a spinning speed of 4 m/min by employing a spinning no~zle provided with 10Q spinnins hcles af a diameter (~) _f 0.13 mm, ther-b~
prepared an acrylic fiber. At this time, the spinning temperature was - 5 ~C and the coagulation was carried GUt in 30 ~ nitric acid.
T~is resultinq acrylic fiber was con~ent onally wsi~Jeri ~ n order to prepare a fabric. The physical properties of -the prepared fully draw yarn and the result of ~he heat insulation test of the resulting fabric prepared are siven in Table 2.
The procedure of Example 15 was repeated, usin~ no ferri e ?article. The physical properties of t.he preparcd fu ' ly ;~'2'N yarn and the result oF the heat in~ulat-on t-ct ~-~
~he resulting fabric prepared are given in T~ble 2.
21050~
B~A* Size* Fully ~raw Yarns Fabrics Ex.Nos.
wt% ~m Strength* Elong.* Heat Ins~l.*
Ex. 1 0.5 0.1 4.5 25 35.0 E,Y. 210.0 0.1 4.0 27 40.0 Ex. 3 60.0 0.1 3.2 33 48.0 Ex. 4 0.5 1.0 4.2 22 36.0 Ex. 5 10.0 l.0 3.8 25 41.2 Ex. 6 60.0 1.0 3.0 30 50.2 Ex. 7 0.5 5.0 4.0 20 34.0 Ex. 8 10.0 5.0 3.7 22 38.2 Ex. 9 60.0 5.0 3.0 28 45.3 Ex. 10 0.5 1Q.0 3.~ 2Q 33.8 Ex. 1110.0 10.0 3.5 22 37.5 Ex. 1260.0 10.0 2.9 25 43.3 Co.Ex.1 0.1 O.C5 Co.Ex.265.0 0.05 Co.Ex.3 0.1 20.0 Co.Ex.465.0 20.0 - - -CG.Ex.5 ~ 4.7 35 32.0 In Tab1e 1:
B/A* : mi~ing amount of the ferrite particles by the weight of polyethylene terephthalate Size* : average particle size of the ferrite particles 21050~
Strength* : tensile strength of the fully draw yarn (g~d) Elong.* : Elongation of the fully draw yarn (%) Heat Insul.* : heat insulation of the fabric (CC) B/A* Fully Draw Yarns Fabrics EX.NOS. PG1 ymers wt% Strength* Elong.* Heat Insul.*
EX. 13 10.0 nY1On 6 4.3 40 42.0 Co.Ex. 6 0.0 nylon 6 4.6 44 34.0 Ex. 1410.0 PG1YPrOPY1ene 4.5 41 43.~
Co.Ex. 70.0 polypropylene 4.9 45 35.0 Ex. 1510.0 acryl* 3.2 30 46.3 Co.Ex. 80.0 acryl* 3.4 33 35.7 In table 2:
B/A* : mixing amount of the ferrite particles ~y the weight of polymer Strength* : tensile strength of the fully draw yarn (g~d~
Elong.* : Elongation of the fully draw yarn ( Heat Insul.* : heat insulation of the fabric ~'C~
acryl* : acrylonitrile Measurement of Tensile Stren~th and Elon~aticn In order to measure the strengths and the elongations of the fully draw yarns of the Examples and the Comparative '~
Examples, each of the fully draw yarns was measured in its tensile strain according to variation of the lohd as well as in its tensile strength and elongation at the tensil failure by employing an universal testing machine (manufactured ~y Instron, Model No. 4301). At this time, the measurement was carried out under the condition of a specimen lensth cf 200 mm, a tension speed of 200 mm/min and a tensile load of 2 kg.
~eGsurement of Heat Insulation In order to measure the heat insulations of the resultin3 ,abrics o; the Examples and the Comparative Examples, each of the prepared fabrics, that is, a fabric impresnated with the ferrite particles or with no ferrite particle, was prepared in the form of a specimen of ~ x 10 cm2. The prepared specimen was in turn subjected to irradiation of a high efficient re,~lection lamp having l ~m center wavelength and ~00 W pcwer in a constant temperature r~om, and measured in the average ~e~peraturQ distribution on its surface by employins the Thermo Tracer*6T62, manufactured by NEC San-ei.
The present invention has been described in detail with particular reference to preferred embodiments thereof, but it will be understood that variations and modifications can be efTected within the spirit and scope of the invention.
2~
*Trademark 17 ~ .
*Trademark 17 ~ .
Claims (2)
1. A method for preparing a synthetic fiber of a good heat insulation characterized in that the synthetic fiber is impregnated with ferrite particles in the process of preparing a synthetic fiber and that the ferrite particles selected from the group of Co-Fe, Cu-Zn-Fe, Ba-Fe, Sr-Fe, Ni-Fe, Ni-Zn-Fe, Mn-Zn-Fe and Mn-Mg-Fe, are added to the synthetic fiber in the amount of 0.5-60% by weight of the synthetic fiber and have an average particle size of 0.1-10µm.
2. The method according to claim 1, wherein the synthetic fiber is selected from the group of polyolefin, polyamide, polyester and polyacrylic fibers.
- Page 1 of Claims -
- Page 1 of Claims -
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019920027418A KR950004348B1 (en) | 1992-12-31 | 1992-12-31 | Manufacturing method of synthetic fiber with excellent heat retention |
| KR92-27418 | 1992-12-31 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2105044A1 CA2105044A1 (en) | 1994-07-01 |
| CA2105044C true CA2105044C (en) | 1999-01-12 |
Family
ID=19348592
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002105044A Expired - Fee Related CA2105044C (en) | 1992-12-31 | 1993-08-27 | Method for preparation of heat insulating synthetic fiber |
Country Status (2)
| Country | Link |
|---|---|
| KR (1) | KR950004348B1 (en) |
| CA (1) | CA2105044C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2505698A4 (en) * | 2009-11-26 | 2013-05-01 | Ningbo Chengying Imp And Exp Co Ltd | Chemical fiber with rapid temperature-rising and heating effect under conditions of light and textile products containing it |
| WO2014108702A3 (en) * | 2013-01-14 | 2014-11-06 | Bae Systems Plc | Ferrite compositions |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2431626A (en) | 2005-10-26 | 2007-05-02 | Avcen Ltd | Bypass turbofan engine |
-
1992
- 1992-12-31 KR KR1019920027418A patent/KR950004348B1/en not_active Expired - Fee Related
-
1993
- 1993-08-27 CA CA002105044A patent/CA2105044C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2505698A4 (en) * | 2009-11-26 | 2013-05-01 | Ningbo Chengying Imp And Exp Co Ltd | Chemical fiber with rapid temperature-rising and heating effect under conditions of light and textile products containing it |
| WO2014108702A3 (en) * | 2013-01-14 | 2014-11-06 | Bae Systems Plc | Ferrite compositions |
Also Published As
| Publication number | Publication date |
|---|---|
| CA2105044A1 (en) | 1994-07-01 |
| KR940014962A (en) | 1994-07-19 |
| KR950004348B1 (en) | 1995-04-28 |
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