CN118541515A

CN118541515A - Polyamide multifilament yarn and textile

Info

Publication number: CN118541515A
Application number: CN202380016955.3A
Authority: CN
Inventors: 岸田泰辅; 兼田千奈美; 渡边雄大
Original assignee: Toray Industries Inc
Current assignee: Toray Industries Inc
Priority date: 2022-01-13
Filing date: 2023-01-12
Publication date: 2024-08-23
Also published as: JPWO2023136307A1; KR20240136960A; WO2023136307A1; TW202340557A

Abstract

A polyamide multifilament having an aliphatic hydrocarbon chain having 7 or more carbon atoms between amide bonds, wherein the polyamide multifilament has a fineness of 2.2dtex or less, a number of hairiness looseness per 10000m of 1 or less, and a coefficient of dynamic friction between filaments and metals of 0.8 [ mu ] d or less.

Description

Polyamide multifilament yarn and textile

Technical Field

The present invention relates to a polyamide multifilament having an aliphatic hydrocarbon chain having 7 or more carbon atoms between amide bonds. When the polyamide multifilament of the present invention is used for a fabric, a fabric excellent in low air permeability, quality and high-order process passage can be provided.

Background

Polyamide fibers, which are synthetic fibers, are widely used in clothing applications such as underwear and outdoor wear because they have excellent properties such as unique flexibility, high strength, color development during dyeing, heat resistance, and hygroscopicity.

In recent years, as awareness of sustainable social development increases, activities of petroleum-free materials are activated, and non-petroleum materials are also demanded for polyamide fibers. As polyamide resins using non-petroleum materials, polyamide 410, polyamide 510, polyamide 610, polyamide 612, polyamide 1010, polyamide 11, etc., using castor oil as a starting material, are known, all of which have a long chain carbon chain structure in a monomer unit.

On the other hand, in outdoor clothing and down jackets (down jackets) which are central goods for the activity of promoting the removal of petroleum raw materials, in order to reduce the air permeability of fabrics, it is required to make the fibers finer and multifilament, from the viewpoints of wind prevention and down fall-off prevention.

As a technique for producing filaments from a polyamide having a long chain carbon chain in a monomer unit, for example, patent document 1 discloses a polyamide 610 multifilament having good hairiness quality when drawn, which is capable of adjusting viscosity by optimizing a polymer water fraction at the time of filament production.

Prior art literature

Patent literature

Patent document 1: international publication No. 2019/163971

Disclosure of Invention

Problems to be solved by the invention

However, the method described in patent document 1 is directed to industrial applications such as fishnets, and is directed to fibers having a single denier of 4.8dtex or more, which are used for clothing applications and are compared with fibers having a large denier. The fine denier per filament, which has been developed mainly for clothing applications, still has a problem of hairiness. In addition, there is a problem that the process passability of the high-order processing is also poor, and the quality of products such as stripes is poor when a fabric is produced.

The present invention solves the above problems and provides a polyamide multifilament for a fabric which is excellent in the process-passing property of high-order processing, low in air permeability and excellent in product quality.

Means for solving the problems

In order to solve the above problems, the present invention is configured as follows.

(1) A polyamide multifilament having an aliphatic hydrocarbon chain having 7 or more carbon atoms between amide bonds, wherein the polyamide multifilament has a fineness of 2.2dtex or less, a number of hairiness looseness per 10000m of 1 or less, and a coefficient of dynamic friction between filaments and metals of 0.8 [ mu ] d or less.

(2) The polyamide multifilament yarn according to (1), which contains 0.01 to 5.0 mass% of inorganic particles.

(3) A fabric, a part of which comprises the polyamide multifilament yarn of (1) or (2).

ADVANTAGEOUS EFFECTS OF INVENTION

The polyamide multifilament of the present invention can provide a fabric which is excellent in high-order process-passing properties, low air permeability, and excellent in product quality, and which is suitable for use in outdoor clothing and the like, while suppressing the occurrence of hairiness and sagging (hairiness sagging).

Drawings

Fig. 1 shows an embodiment of a manufacturing apparatus that can be used in the method for manufacturing a polyamide multifilament of the invention.

Fig. 2 shows a preferred embodiment of a measuring device capable of measuring the dynamic friction coefficient of a wire.

Detailed Description

[ Polyamide multifilament yarn ]

The polyamide multifilament of the present invention has a single filament fineness of 2.2dtex or less, a hairiness number per 10000m of 1 or less, a coefficient of dynamic friction between filaments and metal of 0.8 mu d or less, and a polyamide having an aliphatic hydrocarbon chain having a carbon number of C7 or more between amide bonds.

(Polyamide)

The polyamide constituting the polyamide multifilament of the present invention is a polyamide having an aliphatic hydrocarbon chain having 7 or more carbon atoms (hereinafter abbreviated as "C") between amide bonds.

The number of carbon atoms (i.e., the number of methylene groups) included between the amide bonds is C9 or more in the polyamide produced by polycondensation reaction using an aminocarboxylic acid or a cyclic amide as a raw material, and C7 or more in the polyamide produced by polycondensation reaction using a dicarboxylic acid and a diamine as raw materials. Regarding the upper limit of the number of carbon atoms, the polyamide produced by polycondensation reaction using an aminocarboxylic acid or a cyclic amide as a raw material, and the polyamide produced by polycondensation reaction using a dicarboxylic acid or a diamine as a raw material are each preferably about C12.

As polyamides having an aliphatic hydrocarbon chain of C7 or more between amide bonds, polyamide 11 is a polyamide starting from a cyclic amide, and polyamide 410, polyamide 510, polyamide 610, polyamide 612, polyamide 1010, and the like are a polyamide starting from a dicarboxylic acid and a diamine.

Hereinafter, the minimum units of the raw materials constituting these polyamides are collectively referred to as monomers. Examples of the monomer include a petroleum-derived monomer, a biomass-derived monomer, and a mixture of a petroleum-derived monomer and a biomass-derived monomer.

As described above, depletion of petroleum resources and global warming are regarded as problems, and efforts are being made worldwide to address environmental problems, and development of products using environmentally friendly raw materials independent of petroleum resources is demanded. From this viewpoint, the biomass-derived monomer is preferably contained in the raw material, and more preferably 50 mass% or more of the monomer is a monomer obtained by using biomass. The biomass-derived monomer unit is preferably 50% by mass or more, more preferably 100% by mass.

The method for confirming the biomass-derived raw material includes a method for evaluating the concentration of bio-based carbon by radioactive carbon analysis by the ASTM D6866 method (20-B). The biobased carbon concentration is preferably 50% or more, more preferably 100%.

As described above, in the case of outdoor clothing and down wear, which are central goods for outdoor clothing that are being moved to remove petroleum materials, low air permeability of the fabric, finer monofilaments of polyamide multifilament, and higher multifilament (high multifilament) are required from the viewpoints of wind resistance and prevention of down fall-off.

(Denier per filament)

In the polyamide multifilament of the present invention, it is important that the filament fineness is 2.2dtex or less in order to achieve low air permeability of the woven fabric for outdoor wear and down wear. Preferably 1.3dtex or less. When the thickness is larger than 2.2dtex, the air permeability of the fabric is high, and the values required for use as a jacket or down jacket are poor. On the other hand, as the fineness of the filaments becomes finer, the filament strength decreases, and hairiness and fraying are liable to occur. The hairiness and slackening may cause increased yarn breakage due to the hooking of the reed or the like in the weaving process, or may cause defects such as streaks and unevenness due to tension fluctuation. The fineness of the filaments is preferably 0.2dtex or more.

(Hairiness and collapse)

The polyamide multifilament of the present invention has 1 or less hairiness per 10000m as measured by a laser hairiness detector. When the content is within this range, the high-order process passability and the product quality are excellent. If the number of hairiness is more than 1/10000 m, the high-order process trafficability and product quality become disadvantageous.

(Storage modulus of elasticity, dynamic coefficient of friction)

In particular, the polyamide having an aliphatic hydrocarbon chain of at least 7 used in the present invention is more likely to suffer from hairiness and sagging than polyamide 6 and polyamide 66 (polyamide having an aliphatic hydrocarbon chain of C6), which are general-purpose polyamides used for clothing, and the mechanism of occurrence thereof has not been elucidated.

The present inventors have conducted intensive studies on the mechanism of occurrence of the hairiness collapse. It is clarified that the polyamide having an aliphatic hydrocarbon chain of at least 7 has a property of having a lower storage elastic modulus than the polyamide having an aliphatic hydrocarbon chain of at least 6 in a temperature range (normal temperature to 80 ℃) at the time of fiber production, and the coefficient of dynamic friction between the moving multifilament and the yarn guide is increased.

That is, by having an aliphatic hydrocarbon chain of at least C7 between amide bonds, the number of amide bonds per the same mass decreases and intermolecular hydrogen bonding force decreases. Furthermore, the polyamide is less likely to crystallize, and the storage elastic modulus is low, so that the polyamide has a property of being easily deformed. Thus, the polyamide multifilament having an aliphatic hydrocarbon chain of C7 or more is easily deformed by an external force generated by contact with and bending of the yarn guide, and the contact area with the guide is increased, so that the dynamic friction coefficient is increased, and hairiness is easily generated.

Polyamide multifilament having aliphatic hydrocarbon chains of C7 or more is susceptible to friction between the multifilament and a yarn guide during fiber production, and hairiness is liable to occur. In addition, the yarn is damaged by friction between the multifilament yarn and the yarn guide, not only during the production of the fiber but also during the high-order processing step. The finer the filament number, the more pronounced the tendency.

The storage elastic modulus here was obtained by measurement with a dynamic viscoelasticity automatic measuring instrument, and was evaluated at a level of 2 between 50 ℃ and 80 ℃ in consideration of the filament temperature at which the multifilament yarn passed through the yarn guide.

The polyamide multifilament of the present invention has a dynamic coefficient of filament-to-metal friction of 0.8 mu d or less. The coefficient of dynamic friction referred to herein was obtained by measurement with a moving wire coefficient of friction measuring device, and as a material of the yarn guide, a metal friction body subjected to mirror finishing by metal chromium plating was used, and the coefficient of dynamic friction between the metal friction body and the multifilament yarn was evaluated. Specific measurement methods are described below in examples.

By setting the dynamic friction coefficient between the filaments and the metal to 0.8 mu d or less, the damage caused by friction between the multifilament and the yarn guide is reduced, and the high-order process passage and the product quality are excellent. If the coefficient of dynamic friction between the filaments and the metal is higher than 0.8. Mu.d, the filaments and hairiness are induced by deformation and breakage due to friction between the multifilament and the yarn guide during weaving, and the high-order process passability and the product quality are disadvantageous. The preferable dynamic friction coefficient between the wire and the metal is 0.7 mu d or less.

In order to make the dynamic friction coefficient of the polyamide multifilament of the present invention fall within such a range, various methods are available, but it is preferable to form fine irregularities on the surface of the fiber. By the fine irregularities on the surface of the fiber, the contact area with the yarn guide can be reduced, and the coefficient of dynamic friction can be controlled.

(Inorganic particles)

In order to form fine irregularities on the surface of the fiber, inorganic particles may be added at the time of fiber production. The inorganic particles are not particularly limited as long as they do not adversely affect the production of the fiber, have fiber properties, and do not color the polymer. Examples of the inorganic particles include barium sulfate, titanium oxide, aluminum oxide, zirconium oxide, calcium oxide, magnesium oxide, aluminum nitride, boron nitride, zirconium nitride, aluminum silicate, and zirconium carbide. Among these inorganic particles, barium sulfate, titanium oxide, magnesium oxide, and aluminum oxide are preferable in view of fiber properties, color development, ease of handling of the particles, and high-order processability.

The content of the inorganic particles is preferably 0.01 to 5.0 mass% because the silk-making property and the tensile strength as the fiber property are reduced if the content is so large that the dynamic friction coefficient falls within the above range. When the resin composition contains 0.01 mass% or more, fine uneven portions are formed on the surface of the fiber, the dynamic friction coefficient between the filaments and the metal is reduced, and the occurrence of hairiness is reduced, and the resin composition is excellent in high-order process passage and product quality. Further, the content of 5.0 mass% or less makes it possible to maintain durability without impairing the orientation and crystallization of the fibers and reduce the monofilament hairiness, and therefore, the high-order process passability and the product quality are excellent. More preferably 0.02 to 4.0 mass%.

(Fineness)

Since the polyamide multifilament of the present invention is supposed to be used for clothing applications, the total fineness is preferably 156dtex or less, more preferably 78dtex or less.

(Intensity)

The polyamide multifilament of the present invention is preferably 3.0cN/dtex or more in strength, since it is supposed to be used in clothing applications. When the durability of the cloth is within such a range, the durability of the cloth becomes a level that can withstand practical use.

(Elongation)

The polyamide multifilament of the present invention is preferably 30 to 70% in elongation, since it is supposed to be used for clothing. By setting the range as described above, a clothing excellent in passing performance and quality in high-order processing can be provided. The drawn yarn has a lower elongation than a highly oriented undrawn yarn, and tends to have a tendency to cause hairiness. When the tensile yarn has a coefficient of dynamic friction of 0.8 mu d or less, that is, when the elongation is 30 to 50%, the effect of suppressing the occurrence of hairiness collapse is more exhibited.

(Relative viscosity of sulfuric acid)

Since the polyamide multifilament of the present invention is supposed to be used for clothing, the sulfuric acid relative viscosity of the polyamide is preferably 1.7 to 3.5. By setting the range as described above, the polyamide multifilament having the strength and elongation can be obtained, the durability of the clothing can be improved to a level that can withstand practical use, and clothing excellent in passing performance and quality in high-order processing can be provided.

(Fiber cross-sectional shape)

The fiber cross-sectional shape of the monofilament of the polyamide multifilament of the present invention is not particularly limited, and may be, for example, a circular cross-section, a flat cross-section, a lens-shaped cross-section, a multilobal cross-section, a hollow cross-section, or a known irregular cross-section.

(Deviation of the Length gray component of inorganic particles)

The polyamide multifilament of the present invention preferably has a CV value of 0.5 or less in ash content measured at any 10 points along the fiber length direction. The ash herein is a value measured in accordance with JIS L1013 (2010) ash, and the CV value is an index of deviation. The average value and standard deviation of the ash content of the fiber sample sampled at 10 arbitrary points along the fiber length direction were calculated, and the CV value was obtained.

CV value (%) = (standard deviation)/(average) ×100

When the amount is within such a range, fine irregularities are uniformly formed on the fiber surface with respect to the inorganic particles, and it is effective to set the dynamic friction coefficient and the number of hairiness to such a range.

In particular, the polyamide having an aliphatic hydrocarbon chain of at least 7 used in the present invention is inferior in dispersibility of inorganic particles to polyamide 6 and polyamide 66 (polyamide having an aliphatic hydrocarbon chain of C6) which are general-purpose polyamides used for clothing. This is because the polyamide having an aliphatic carbon chain of not less than C7 has a low density of amide bonds, and thus becomes a polymer having a low polarity, and the difference in interfacial tension between the polyamide and the inorganic particles having a high polarity becomes large, so that aggregation of the inorganic particles is deteriorated. In this way, since the dispersibility of inorganic particles in a polyamide polymer is reduced and coarse particles are generated due to aggregation, the surface irregularities of the fiber tend to become uneven, and a method capable of maintaining good dispersibility is desired as a method of adding inorganic particles.

[ Method for producing Polyamide multifilament yarn ]

An example of the production of the polyamide multifilament yarn of the present invention is shown.

< Inorganic particle addition >)

The method of adding the inorganic particles to the polyamide may be carried out in a polymerization process in the production of a sheet or in a melt kneading process. The inorganic particle addition method for improving the dispersibility of inorganic particles is, for example, preferably used appropriately and effectively as follows.

(Addition during polymerization)

As a method of adding the polyamide resin during polymerization, inorganic particles, a dispersant, a proper amount of a terminal group regulator, a weather-resistant agent, and an antioxidant are added to the aqueous solution of the polyamide raw material monomer in preparation of the polymer raw material preparation liquid, and the mixture, the dissolution, and the dispersion are performed by stirring and circulation. In order to improve dispersibility, a method of adding inorganic particles after mixing a dispersant and an acid-terminated modifier in advance is desired. This makes it possible to suppress aggregation of the inorganic particles and generation of coarse particles in the polymer by interaction between the dispersant and the component on the surface of the coated inorganic particles.

Dispersing agent

In the case where the inorganic particles are barium sulfate, titanium oxide, magnesium oxide, or aluminum oxide, polyacrylic acid is preferably used as the dispersant. The content of the dispersant is appropriately adjusted according to the content of the inorganic particles, but when the content of the polyacrylic acid is 0.01 to 0.15% relative to the inorganic particles, good dispersibility is obtained, which is more preferable.

(Melt kneading)

In the case of melt kneading, a method of kneading the polyamide flakes having an aliphatic hydrocarbon chain of C7 or more used in the present invention with inorganic particles in a molten state using an extruder or the like is preferable. In this case, a dispersant may be used in the same manner as described above.

Melt viscosity

When the polyamide is added by melt kneading, the melt viscosity at the melt temperature of the polyamide is preferably 3500 poise or less. By setting the melt viscosity to 3500 poise or less, even if kneading is enhanced after the addition of the inorganic particles, the dispersion of the inorganic particles is good, and aggregation of the inorganic particles and generation of coarse particles in the polymer can be suppressed. It should be noted that the number of the substrates, 1 poise=0.1 pa·s.

Examples of the melt kneading method include a method of mixing and melting inorganic particles into a sheet, a method of mixing and melting a master batch containing a high concentration of inorganic particles with a sheet, and a method of adding inorganic particles to a polymer in a molten state and melt kneading, and any method may be used.

In the case of the masterbatch mixing method, the particle concentration of the masterbatch is preferably 20 mass% or less in order to prevent a decrease in concentration uniformity due to aggregation of the inorganic particles.

Melt filtration

After the melt kneading, the agglomerated inorganic particles are preferably dispersed. Therefore, it is preferable to perform filtration by a filter for filtration at the time of melt extrusion. The filter is preferably a nonwoven fabric made of SAS and has a pore size of less than 50 μm.

< Silk making >)

In the case of adding inorganic particles during polymerization, the polymer is melted by a conventional method, and in the case of melt kneading, the melt viscosity, kneading method, and melt filtration are applied, and after the molten polyamide polymer is filtered, the polymer is metered and transported by a gear pump, discharged from a spinneret, passed through a vapor-spraying device provided immediately below the spinneret and spraying vapor toward the spinneret face, and cooled and solidified to room temperature in a region provided on the downstream side of the vapor-spraying device and blowing cold air from a cooling device, and then the strands are bundled by oiling by a oiling device, and are passed through a drawing roll and a stretching roll by interlacing by a fluid interlacing nozzle device. At this time, the yarn is stretched at a ratio of the peripheral speeds of the pull roll and the stretch roll. Further, the yarn is heat-set by heating with a stretching roller, and is wound with a winder (winding device).

In the case of producing a drawn yarn, it is preferable to produce the yarn by drawing at a high draw ratio/low draw ratio in order to suppress the occurrence of hairiness. The draft ratio is preferably 100 to 300, and the stretch ratio is preferably 1.1 to 2.0. The fiber structure is stable until the drawing is performed by the high draft ratio, and the drawing point at the drawing is stable, thereby contributing to suppression of hairiness collapse. The draft ratio is a value obtained by dividing the peripheral speed of the pull roll by the discharge linear speed discharged from the spinneret, and is calculated by the following equation.

Draft ratio= (circumferential speed of traction roller)/(discharge line speed)

The polyamide multifilament of the present invention can be produced not only by the above-described production method but also by a two-stage process in which the drawn yarn is drawn after the drawing roll and the drawing roll, and the drawn yarn is drawn.

When the polyamide multifilament yarn of the present invention is produced into a highly oriented undrawn yarn, yarn processing can be performed by a generally used method. As the yarn processing, friction false twisting processing, needle bar (pin) false twisting processing, composite false twisting processing, and the like can be appropriately selected.

[ Fabric ]

The invention also relates to a part of a fabric comprising the polyamide multifilament yarn described above.

The polyamide multifilament yarn of the present invention may be woven into a fabric by a generally used method. As the weave of the fabric, general weave such as plain weave, twill weave, satin weave, yarn, and rib weave, multiarm weave, and jacquard weave can be appropriately selected.

The polyamide multifilament yarn of the invention is used directly in woven fabrics. The dyeing, subsequent post-processing, and final setting (final setting) conditions after further producing the fabric may be performed by a known method, and the acid dye or the reactive dye may be used as the dye, and the color is not limited.

The polyamide multifilament of the present invention is preferably used for a jacket or a down coat, and can be used for a shirt, a underpants, or the like by appropriately selecting a fabric structure.

Examples

The present invention will be described in further detail with reference to examples.

A. Strength and elongation

The fiber sample was measured in accordance with JIS L1013 (2010) tensile strength and elongation. As test conditions, the type of the tester was a constant-speed traction type, and the test was performed at a clamp interval of 50cm and a stretching speed of 50 cm/min. When the strength at the time of cutting was smaller than the maximum strength, the maximum strength and the elongation at that time were measured.

The strength and elongation were obtained by the following formulas.

Intensity = intensity at cut (cN)/denier (dtex)

Elongation = elongation at break (%)

B. Denier of denier

The fiber sample was placed on a length measuring machine of 1.125 m/week and rotated 500 times to prepare a loop-shaped twisted yarn, which was dried by a hot air dryer (105.+ -. 2 ℃ C., 60 minutes), and the mass of the twisted yarn was measured by a balance, and the fineness (dtex) was calculated from the value obtained by multiplying the measured moisture regain.

C. Relative viscosity of sulfuric acid

0.25G of the polyamide sheet sample or the fiber sample was dissolved so as to be 1g with respect to 100ml of 98 mass% sulfuric acid, and the flow-down time (T1) at 25℃was measured by using an Ostwald viscometer. Next, the flow-down time (T2) of sulfuric acid having a concentration of only 98% by mass was measured. The ratio of T1 to T2, T1/T2, is defined as the relative viscosity of sulfuric acid.

D. inorganic particle content (ash content)

The fiber sample was measured in accordance with JIS L1013 (2010) ash.

The crucible was baked in an electric furnace at 800℃for 2 hours, cooled for 1 hour, and then precisely weighed (A1). A fiber sample (S) dried to a moisture content of less than 300ppm was measured in the crucible, and heated and burned by an electric furnace and a gas burner. Subsequently, the crucible was heated in an electric furnace at 800℃for 2 hours, cooled for 1 hour, and then precisely weighed. The heating and firing by the electric furnace and the gas burner, and the precise weighing after the heating and cooling by the electric furnace are repeated until the same value as the previous precise weighing result is obtained. The precise weighing result obtained in this way was designated as (A2), and the inorganic particle content was determined by the following formula.

Inorganic particle content (% by mass) = (A2-A1)/sx 100.

E. Concentration of biobased carbon

The fiber sample was analyzed for biobased carbon concentration (%) by radioactive carbon analysis according to ASTM D6866 method (20-B).

F. Storage elastic modulus

The fiber sample was evaluated for dynamic viscoelasticity when temperature scanning was performed from 35 to 100 ℃ using a dynamic viscoelasticity automatic measuring instrument DDV-GP manufactured by AND corporation. The viscoelastic behavior at 2 levels of 50 ℃ and 80 ℃ was analyzed considering the filament temperature at the time of mechanical contact with an introducer or the like. Since the elastic behavior is dominant in this temperature region, the storage elastic modulus is displayed.

G. Coefficient of dynamic friction between wire and metal

The moving yarn path of the measurement yarn was set as shown in fig. 2 using a moving yarn friction coefficient measuring device made by the english industry (ltd) composed of a tension cut loop guide (Tension cut ring guide) 8, tension measuring units 9, 10, a tension roller 11, a driving unit 12, a data processing unit, and a recorder, as shown in fig. 2. The tension roller 11 was a fixed metal cylinder having a diameter of 15mm and a length of 100mm, the surface of which was mirror-finished by metal chromium plating, the measuring yarn was brought into contact with the tension roller 11 (metal friction body d) at 90 ° so that the yarn movement speed was 2.5 m/min, and the yarn tension (T1) before the contact with the tension roller 11 (metal friction body d) was set at 10cN and was moved for 60 seconds. The yarn tension (T1, tension measuring unit 9) before the contact with the tension roller 11 (metal friction body d) and the yarn tension (T2, tension measuring unit 10) after the contact are continuously measured and recorded in a recorder. The average values recorded by the recorder were (T1) and (T2), and the dynamic coefficient of friction (μd) between the wire and the metal was calculated using the following formula.

Coefficient of dynamic friction (μd) =1/(0.5×pi) ×log (T2/T1)

H. number of loose hairiness

The fiber sample was unwound at 600 m/min for 40 minutes, and an MFC-200 laser hairiness detector, manufactured by ademetre, was provided at a position 15mm from the moving wire during unwinding, and the number of defects detected was converted into the number per 10000 m.

I. Evaluation of textile articles

(A) Air permeability

Regarding the fabrics obtained in examples/comparative examples, air permeability was evaluated. The air permeability was measured according to JIS L1096 (2010) and the air permeability Freeze method (A method). The fabric was measured 3 times, and 4-stage evaluation was performed on the basis of the average value.

A: less than 0.7cc

B:0.7cc or more and less than 1.0cc,

C:1.0cc or more and less than 1.3cc,

D:1.3cc or more

A, B was set as pass.

(B) Product quality

The fabric was visually inspected for unevenness and streak generation per 50m, and evaluated on the following basis.

A: has no streak and uneven, and has excellent quality.

B: although slight streaks and unevenness were generated, there was no problem when used as a product.

C: streaks and unevenness occur, and the product cannot be used.

A, B was set as pass.

(C) High order pass (in the table, abbreviated as high order pass.)

The number of stop times due to yarn breakage when a plain weave fabric was woven at a weaving speed of 750rpm and a weft length of 1620mm by a water jet loom was evaluated on the basis of the following criteria.

A: less than 2 times

B: more than 2 times and less than 4 times

C: more than 4 times and less than 6 times

D: more than 6 times

A, B was set as pass.

[ Example 1]

(Production of Polyamide multifilament yarn)

A master batch of polyamide 610 containing 20 mass% of titanium oxide was produced using polyamide 610 having an aliphatic hydrocarbon chain having C8 carbon atoms between the amide bonds (sulfuric acid relative viscosity 2.7, melting point: 225 ℃ C., melt viscosity 700 poise at 280 ℃ C., specific gravity 1.07g/cm ³, melt density 0.92g/cm ³). A polyamide 610 sheet with 1.5 mass% of the masterbatch added thereto was obtained so that the titanium oxide content in the yarn became 0.3 mass%. The sheet was adjusted to a water content of 0.14 mass%, and the sheet was fed into a spinning machine shown in FIG. 1, melted at a spinning temperature of 280℃and filtered by a filter having a pore diameter of 10 μm made of a nonwoven fabric made of SAS, and spun at a discharge rate of 39.6 g/min (discharge linear velocity of 19.8 m/min) from a spinneret 1 having 96-hole discharge pores having a pore diameter of 0.20mm and a pore length of 0.70 mm. After the spun yarn was cooled and solidified by spraying cold air to the yarn by the cooling device 2 and oiled by the oiling device 3, the yarn was subjected to interlacing by the fluid interlacing nozzle device 4, and the drawing was performed with the circumferential speed (drawing speed) of the drawing roll 5 set at 3460 m/min (set value, draft ratio 175.1). Next, the yarn drawn by the drawing roll 5 was drawn by a drawing roll 6 having a surface temperature of 170 ℃, and stretched between the rolls (between the rolls 5 and 6) to a stretch ratio of 1.30 times, and wound by a winder 7 having a winding speed of 4500 m/min (set value), whereby 4 filaments of 22dtex-24 polyamide 610 multifilament were obtained. The resultant polyamide multifilament was evaluated for fineness, elongation and number of hairiness and collapse per 10000 m. The results are shown in table 1. The ash content variation CV value in the fiber length direction was 0.1.

(Production of fabrics)

1000 Multifilament yarns were wound around a beam by warping, and the yarn wound around the beam was sized and dried to prepare a warp yarn. Next, the obtained multifilament was driven into weft yarn by a reed of a water jet loom to weave a plain weave fabric. The woven fabric was subjected to scouring, heat setting at 170 ℃ (intermediate setting), dyeing, and calendering at 170 ℃ to obtain a woven fabric for outdoor wear. The results of evaluating the obtained fabric are shown in table 1.

The process passability of the fabric production is extremely good. The air permeability characteristics are also excellent, and the product quality is also excellent.

TABLE 1

[ Example 2]

A polyamide 610 multifilament of 22dtex-24 filaments was obtained in the same manner as in example 1 except that the content of the inorganic particles added was changed to 0.5 mass% in the filaments, and a fabric was produced in the same manner as in example 1. The evaluation results are shown in table 1.

[ Example 3]

A polyamide 610 multifilament yarn of 22dtex-24 filaments was obtained in the same manner as in example 1 except that the content of the inorganic particles added was changed to 0.04 mass% in the filaments, and a fabric was produced in the same manner as in example 1. The evaluation results are shown in table 1.

[ Examples 4 and 5, comparative examples 1 and 2 ]

A fabric was produced in the same manner as in example 1, except that the content of titanium oxide was changed as described in table 1, and a 22dtex-24 filament polyamide 610 multifilament was obtained in the same manner as in example 1. The evaluation results are shown in table 1.

[ Example 6]

A polyamide 610 multifilament having 44dtex-72 filaments was obtained as highly oriented undrawn filaments in the same manner as in example 1, except that the spinneret having round holes with 144-hole discharge aperture of 0.20mm and hole length of 0.70mm was used, and the winding speed was changed to 3500 m/min without drawing (draw ratio 1.0).

(Silk processing)

The obtained highly oriented undrawn yarn was subjected to a drawing friction false twisting process using a 3-axis friction disk type drawing friction false twisting apparatus. From a feed roll having a circumferential speed of 550 m/min, the yarn was fed to a contact false twist heater heated to 170℃and stretched to 1.5 times, and then false-twisted at a disk rotation speed of 7500rpm, a disk diameter of phi 51, a D/Y ratio of 2.18 and a false twist coefficient of 30000, to obtain a polyamide 610 false-twisted yarn of 35dtex-72 filaments (D: feed roll speed (m/min), Y: disk rotation speed (m/min)). Using the obtained false twist yarn, a fabric was produced in the same manner as in example 1. The results are shown in table 1.

Example 7

A polyamide 610 multifilament yarn of 26dtex-20 filaments was obtained as a highly oriented undrawn yarn in the same manner as in example 1, except that the spinneret having 60 round holes with a discharge hole diameter of 0.20mm and a hole length of 0.70mm was used, and the winding speed was changed to 4000 m/min without drawing (draw ratio 1.0). A yarn was processed in the same manner as in example 6 to obtain a polyamide 610 false twist processed yarn of 22dtex-20 filaments. Using the obtained false twist yarn, a fabric was produced in the same manner as in example 1. The results are shown in table 1.

[ Comparative example 3]

A fabric was produced in the same manner as in example 1, except that a spinneret having a 28-hole discharge hole diameter of 0.30mm and a hole length of 0.75mm was used, the draw ratio was changed to 1.5 times, and the winding speed was changed to 4500 m/min, to obtain a 22dtex-7 filament polyamide 610 multifilament in the same manner as in example 1. The evaluation results are shown in table 1.

Example 8

A fabric was produced in the same manner as in example 1, except that the draw ratio was changed to 1.4 times using polyamide 510 having an aliphatic hydrocarbon chain having C8 carbon atoms between amide bonds (sulfuric acid relative viscosity 2.8, melting point: 225 ℃ C., melt viscosity 800 poise at 280 ℃ C., specific gravity 1.07g/cm ³, melt density 0.92g/cm ³), and 22dtex-24 filaments of polyamide 510 multifilament was obtained in the same manner as in example 1. The evaluation results are shown in table 2.

TABLE 2

[ Comparative examples 4 and 5]

A fabric was produced in the same manner as in example 1, except that the content of titanium oxide was changed as described in table 2, and a 22dtex-24 filament polyamide 510 multifilament was obtained in the same manner as in example 8. The evaluation results are shown in table 2.

[ Example 9]

A fabric was produced in the same manner as in example 1, except that the draw ratio was changed to 1.3 times using polyamide 410 having an aliphatic hydrocarbon chain having C8 carbon atoms between amide bonds (sulfuric acid relative viscosity 2.8, melting point: 250 ℃, melt viscosity 1100 poise at 280 ℃, specific gravity 1.09g/cm ³, melt density 0.94g/cm ³), and a polyamide 410 multifilament having 22dtex-24 filaments was obtained in the same manner as in example 1. The evaluation results are shown in table 2.

[ Comparative examples 6 and 7]

A fabric was produced in the same manner as in example 1, except that the content of titanium oxide was changed as described in table 2, and a 22dtex-24 filament polyamide 410 multifilament was obtained in the same manner as in example 9. The evaluation results are shown in table 2.

[ Example 10 ]

A fabric was produced in the same manner as in example 1, except that polyamide 11 having an aliphatic hydrocarbon chain having carbon number C10 between amide bonds (sulfuric acid relative viscosity 2.0, melting point: 187 ℃, melt viscosity 1000 poise at 235 ℃, specific gravity 1.03g/cm ³, melt density 0.89g/cm ³) was used, the melting temperature was changed to 235 ℃, and the draw ratio was changed to 1.5 times, to obtain polyamide 11 multifilament of 22dtex-24 filaments, and a fabric was produced in the same manner as in example 1. The evaluation results are shown in table 2.

Comparative examples 8 and 9

A fabric was produced in the same manner as in example 1, except that the content of titanium oxide was changed as described in table 2, and a 22dtex-24 filament polyamide 11 multifilament was obtained in the same manner as in example 10. The evaluation results are shown in table 2.

[ Reference example 11 ]

A fabric was produced in the same manner as in example 1, except that polyamide 6 having an aliphatic hydrocarbon chain having C5 carbon atoms between amide bonds (sulfuric acid relative viscosity 2.7, melting point: 220 ℃ C., melt viscosity 1100 poise at 280 ℃ C., specific gravity 1.14g/cm ³, melt density 0.98g/cm ³) was used, that no titanium oxide was contained, that the draw ratio was changed to 1.7 times, and that a 22dtex-24 filament polyamide 6 multifilament was obtained in the same manner as in example 1. The evaluation results are shown in table 2.

Industrial applicability

The polyamide multifilament of the present invention can provide a fabric which is excellent in high-order process passage properties, low in air permeability, and excellent in product quality, and which is suitably used for outdoor wear and the like, while suppressing occurrence of hairiness from sagging.

While the invention has been described in detail and with reference to specific embodiments thereof, it will be apparent to one skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope thereof.

The present application is based on japanese patent application (japanese patent application publication No. 2022-003499), filed on 1 month 13 of 2022, the contents of which are incorporated herein by reference.

Description of symbols

1: Spinneret nozzle

2: Cooling device

3: Oiling device

4: Fluid interlacing nozzle device

5: Traction roller

6: Stretching roller

7: Winding device (winding machine)

8: Tension cut-off ring-shaped guide

9: Tension measuring unit

10: Tension measuring unit

11: Tension roller

12: And a driving unit.

Claims

1. A polyamide multifilament having an aliphatic hydrocarbon chain having 7 or more carbon atoms between amide bonds, wherein the polyamide multifilament has a fineness of 2.2dtex or less, a number of hairiness looseness per 10000m of 1 or less, and a coefficient of dynamic friction between filaments and metals of 0.8 [ mu ] d or less.

2. The polyamide multifilament yarn according to claim 1, which contains 0.01 to 5.0 mass% of inorganic particles.

3. A fabric, a portion of which comprises the polyamide multifilament yarn of claim 1 or 2.