TW202340557A - Polyamide multifilament and fabric - Google Patents

Abstract

This polyamide multifilament has a single fiber fineness of 2.2 dtex or less, results in not more than one fluff or slack existing per 10000 m of the multifilament, provides a dynamic friction coefficient of 0.8 [mu]d or less between a metal and a yarn, and has an aliphatic hydrocarbon chain having a carbon number of C7 or more between amide bonds.

Description

Polyamide multifilament and fabrics

The present invention relates to polyamide multifilaments having aliphatic hydrocarbon chains with a carbon number of C7 or more between the amide bonds. If the polyamide multifilament of the present invention is used in fabrics, fabrics with excellent low air permeability, quality, and smoothness in advanced steps can be provided.

Polyamide fiber, a synthetic fiber, is widely used in underwear, outdoor jackets and other clothing applications because of its unique softness, high strength, color development when dyed, heat resistance, moisture absorption and other excellent properties.

In recent years, due to the rising awareness of building a sustainable society, activities to eliminate petrochemical raw materials have become increasingly active. Even polyamide fibers are required to be made of non-petrochemical raw materials. Polyamide resins using non-petrochemical raw materials include polyamide 410, polyamide 510, polyamide 610, polyamide 612, polyamide 1010, and polyamide using castrate as a starting material. 11 and so on, any one of them has a structure in which the monomer unit has a long carbon chain.

On the other hand, for applications such as outdoor jackets and down jackets, which are core products of outdoor apparel that are leading the movement to eliminate petrochemical raw materials, fabrics are required to have low air permeability from the viewpoint of wind protection and down shedding prevention, so the fiber fineness is required to be reduced. and multifilamentation.

The yarn-making technology of polyamides whose monomer units have long carbon chains, such as Patent Document 1, can adjust the viscosity by appropriately adjusting the moisture content of the polymer during yarn-making, so as to provide good quality pills during stretching. Polyamide 610 multifilament. [Prior technical literature] [Patent Document]

[Patent Document 1] International Publication No. 2019/163971

(The problem that the invention wants to solve)

However, the method described in Patent Document 1 is targeted at industrial uses such as fishing nets, and is targeted at fibers with a single filament fineness of 4.8 dtex or more, which is relatively coarse in comparison with clothing applications. Monofilament fine-density fabrics, which are mainly used for clothing, still have the problem of producing pills. In addition, the smoothness of high-end processing steps is also poor, and there are issues such as streaks when fabricating and poor product quality.

The present invention was completed to solve the above-mentioned problems, and aims to provide a polyamide multifilament yarn that can provide fabrics with excellent smoothness in high-end processing steps, low air permeability, and excellent product quality. (Technical means to solve problems)

In order to solve the above-mentioned problems, the present invention has the following configuration. (1) A polyamide multifilament with a single filament fineness of 2.2 dtex or less, a loose ball number of less than 1 per 10,000 m, a filament-metal dynamic friction coefficient of 0.8 μd or less, and an amide bond. There is an aliphatic hydrocarbon chain with a carbon number of C7 or above. (2) The polyamide multifilament yarn according to the above (1), which contains 0.01 to 5.0% by mass of inorganic particles. (3) A fabric, a part of which contains the polyamide multifilament according to (1) or (2). (Compare the effectiveness of previous technologies)

The polyamide multifilament of the present invention can provide fabrics that suppress the occurrence of pilling and looseness (loose feathers), have excellent smoothness in advanced steps, have low air permeability, and have excellent product quality, and are suitable for outdoor jackets, etc. .

[Polyamide multifilament] The fineness of the polyamide multifilament monofilament of the present invention is less than 2.2 dtex, the number of loose hair balls per 10,000 m is less than 1, the dynamic friction coefficient between silk and metal is less than 0.8 μd, and there is carbon between the amide bonds. Polyamide multifilament with aliphatic hydrocarbon chains of C7 or above.

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

The number of carbons (i.e., the number of methylene groups) contained between the amide bonds is C9 or more if the polyamide system is produced by polycondensation reaction using aminocarboxylic acid or cyclic amide as raw materials. The polyamide produced by polycondensation reaction with diamine as raw material is C7 or above. The upper limit of the carbon number of polyamides produced by polycondensation reaction of aminocarboxylic acid and cyclic amide as raw materials, and of polyamides produced by polycondensation reaction of dicarboxylic acid and diamine as raw materials is preferably: Around C12.

As a polyamide with an aliphatic hydrocarbon chain of C7 or above between the amide bonds, the polyamide using cyclic amide as raw material is polyamide 11, and the polyamide using dicarboxylic acid and diamine as raw material is Polyamide 410, polyamide 510, polyamide 610, polyamide 612, polyamide 1010, etc.

Hereinafter, the smallest unit of the raw materials constituting these polyamides is collectively referred to as "monomer". Examples of the monomer system include a petroleum-derived monomer, a biomass-derived monomer, a mixture of a petroleum-derived monomer and a biomass-derived monomer, and the like.

As mentioned above, the depletion of petroleum resources and global warming are regarded as problems, and efforts are being made to find solutions to environmental problems on a global scale. It is expected to develop products that use raw materials that are not dependent on petroleum resources and are environmentally friendly. From this point of view, it is preferable that the raw material contains monomers derived from biomass, and more preferably 50% by mass or more of the monomers are monomers obtained by utilizing biomass. The monomer unit derived from biomass is preferably 50% by mass or more, and more preferably 100% by mass.

In addition, the verification method of biomass-derived raw materials can be, for example, a method of evaluating bio-based carbon concentration using radiocarbon analysis according to ASTM D6866 method (20-B). The best bio-based carbon concentration is more than 50%, and the best is 100%.

As mentioned above, in applications such as outdoor jackets and down jackets, which are core products of outdoor apparel leading the movement to eliminate petrochemical raw materials, fabrics are required to have low air permeability from the viewpoint of windproofing and preventing down shedding, and there is a trend toward single polyamide multifilament yarns. The evolution of silk fineness and high multifilament.

(monofilament fineness) The polyamide multifilament monofilament of the present invention has a fineness of 2.2 dtex or less, which is important in achieving low air permeability of fabrics for outdoor jackets and down jackets. The best one is below 1.3dtex. When it is thicker than 2.2 dtex, the breathability of the fabric is high, which is poor for the values required for outdoor jackets and down jackets. On the other hand, as the fineness of the monofilament becomes smaller, the strength of the monofilament decreases, making it easier to produce pilling and looseness. Hair balls and looseness may catch on the reed during the weaving process, leading to increased yarn breakage, or the possibility of inducing defects such as streaks and spots due to tension changes. The best single fiber fineness is above 0.2dtex.

(The hair ball is loose) The polyamide multifilament of the present invention is measured using a laser-type pill detector. The number of loose pills per 10,000 m is less than 1. By setting it within this range, high-level steps can be made smooth and product quality can be excellent. If the number of loose hair balls is more than 1/10000m, the smoothness of the advanced steps and the quality of the product will be poor.

(Storage elastic modulus, dynamic friction coefficient) In particular, the polyamide with an aliphatic hydrocarbon chain of C7 or above used in the present invention is compared with the general polyamides used in clothing materials such as polyamide 6 and polyamide 66 (polyamide with C6 aliphatic hydrocarbon chain). amide), it is easy to cause loose hair balls, but the mechanism is not yet clear.

The inventors of the present invention conducted in-depth research on the mechanism of hair ball looseness. Polyamides with aliphatic hydrocarbon chains of C7 or above have a lower storage elastic modulus than polyamides with aliphatic hydrocarbon chains of C6 or below in the temperature range during fiber production (normal temperature ~ 80°C). The low properties indicate that the dynamic friction coefficient between the running microfilament and the yarn guide increases.

That is, by having a C7 or higher aliphatic hydrocarbon chain between amide bonds, the number of amide bonds per the same mass decreases, resulting in a decrease in intermolecular hydrogen bonding force. Therefore, the polyamide has the properties of being less likely to cause crystallization of the polyamide, lowering the storage elastic modulus, and easily deforming. As a result, the polyamide multifilament yarn having a C7 or higher aliphatic hydrocarbon chain is easily deformed due to contact with the yarn guide or external force generated by deflection, resulting in an increase in the contact area with the yarn guide. Increasing the dynamic friction coefficient will easily cause loose hair balls.

Polyamide multifilaments with aliphatic hydrocarbon chains of C7 or above are easily affected by friction between the multifilament and the yarn guide during fiber manufacturing, resulting in loose hair balls. In addition, not only fiber manufacturing, but also high-level processing steps may be damaged due to friction between the multifilament and the yarn guide. This tendency is more obvious for multifilaments with finer single-filament fineness.

In addition, the so-called "storage elastic modulus" here is measured using a dynamic viscoelasticity automatic measuring device (Rheovibron). The yarn temperature when the multifilament passes through the yarn guide is taken into consideration, and the evaluation is carried out at two levels: 50°C and 80°C.

The dynamic friction coefficient between the polyamide multifilament yarn and the metal is below 0.8 μd. The so-called "dynamic friction coefficient" here is measured using a running yarn friction coefficient measuring device. The yarn guide material is a metal wiping body that is plated with metallic chromium and has a mirror finish. The friction between the metal wiping body and the multifilament yarn is measured. The dynamic friction coefficient is evaluated. Specific measurement methods will be described later in the Examples.

By setting the dynamic friction coefficient between the wire and the metal below 0.8μd, the damage caused by the friction between the multifilament and the wire guide can be reduced, so that the high-end steps can be smooth and the product quality can be excellent. If the dynamic friction coefficient between the wire and the metal is higher than 0.8μd, deformation damage will occur due to the friction between the multifilament and the wire guide during weaving, which will induce wire breakage and hair balls, resulting in changes in the smoothness of high-level steps and product quality. Difference. The preferred dynamic friction coefficient between wire and metal is below 0.7μd.

In order to set the dynamic friction coefficient of the polyamide multifilament yarn of the present invention within this range, there are various methods, but it is preferable to form fine unevenness on the fiber surface. Through the fine unevenness on the fiber surface, the contact area with the yarn guide can be reduced, and the dynamic friction coefficient can be controlled.

(Inorganic particles) In order to form fine unevenness on the fiber surface, inorganic particles can be added during fiber production. When selecting inorganic particles, there are no special restrictions as long as they are inorganic particles that do not cause adverse effects during fiber production, maintain fiber physical properties, and do not cause coloring of the polymer. Examples of inorganic particles include barium sulfate, titanium oxide, aluminum oxide, zirconium oxide, calcium oxide, magnesium oxide, aluminum nitride, boron nitride, zirconium nitride, aluminum silicate, zirconium carbide, and the like. Among these inorganic particles, in consideration of fiber physical properties, color development properties, ease of particle handling, and high-level processability, barium sulfate, titanium oxide, magnesium oxide, and aluminum oxide are preferred.

The inorganic particle content can be appropriately adjusted so that the kinetic friction coefficient falls within this range. If it is too high, spinning properties and tensile strength, which are fiber physical properties, will decrease, so it is preferably 0.01 to 5.0 mass %. By containing 0.01% by mass or more, fine uneven portions are formed on the fiber surface, reducing the dynamic friction coefficient between the wire and the metal, thereby reducing the occurrence of loose hair balls, making high-end steps smooth and product quality excellent. In addition, by setting the content to 5.0 mass% or less, fiber orientation and crystallization are not hindered, durability can be maintained, and single filament pilling can be reduced, so high-end steps are smooth and product quality is excellent. More preferably, it is 0.02~4.0% by mass.

(denier) Since the polyamide multifilament yarn of the present invention is assumed to be used for clothing, the total fineness is preferably 156 dtex or less, more preferably 78 dtex or less.

(strength) Since the polyamide multifilament yarn of the present invention is assumed to be used for clothing, the strength is preferably 3.0 cN/dtex or more. By setting it within this range, the durability of the clothing material can reach a level that can withstand actual use.

(extension) Since the polyamide multifilament yarn of the present invention is expected to be used for clothing, the elongation is preferably 30 to 70%. By setting it within this range, it is possible to provide fabrics with excellent quality and smoothness during high-end processing. Compared with highly oriented unstretched yarns, stretched yarns have lower elongation, which tends to cause loose hair balls. The effect of controlling the dynamic friction coefficient below 0.8μd (that is, when the elongation is 30~50%) can further demonstrate the effect of suppressing the loosening of hair balls.

(relative viscosity of sulfuric acid) Since the polyamide multifilament of the present invention is expected to be used for clothing, the sulfuric acid relative viscosity of the polyamide is preferably 1.7 to 3.5. By setting it within this range, the polyamide multifilament yarn with the above-mentioned strength and elongation can be obtained, and the durability of the clothing can be increased to a level that can withstand actual use, and the smoothness and quality of the clothing during high-end processing can also be excellent.

(fiber cross-section shape) The fiber cross-sectional shape of the polyamide multifilament monofilament of the present invention is not particularly limited, and can be, for example, circular cross-section, flat cross-section, lens-shaped cross-section, multi-blade cross-section, hollow cross-section, and other well-known cross-sections of different shapes.

(Changes in the ash content of the long sides of inorganic particles) The CV value of the ash content of the polyamide multifilament of the present invention measured at any 10 locations in the fiber longitudinal direction is preferably 0.5 or less. The "ash content" here refers to the value measured according to JIS L1013 (2010) ash content, and the CV value is an indicator of fluctuation. For fiber samples sampled at any 10 locations along the fiber length direction, the average and standard deviation of the ash content are calculated to obtain the CV value. CV value (%)=(standard deviation)/(mean)×100 By setting it within this range, uniform inorganic particles form fine irregularities on the fiber surface, which helps to set the dynamic friction coefficient and the number of hair balls within this range.

In particular, the polyamide with an aliphatic hydrocarbon chain of C7 or above used in the present invention is compared to the polyamide 6 and polyamide 66 (polyamide with a C6 aliphatic hydrocarbon chain) commonly used in clothing materials. amine), the dispersion of inorganic particles is poor. The reason is that polyamides with aliphatic carbon hydrocarbon chains of C7 or above reduce the density of amide bonds, making the polymer less polar. This increases the interfacial tension difference between the inorganic particles and the highly polar inorganic particles, causing the inorganic particles to collapse. Caused by deterioration of cohesion. Accordingly, since the dispersibility of the inorganic particles in the polyamide polymer decreases and the aggregation leads to the formation of coarse particles, which can easily lead to uneven unevenness on the fiber surface, the method for adding the inorganic particles is preferably a method that maintains good dispersion. .

[Manufacturing method of polyamide multifilament yarn] An example of manufacturing the polyamide multifilament yarn of the present invention is given.

＜Add inorganic particles＞ Methods for adding inorganic particles to polyamide include adding them during polymerization to produce chips, or performing melt-kneading. In order to improve the dispersibility of the inorganic particles, the method for adding inorganic particles is preferably appropriately utilized, for example.

(added during aggregation) The method of adding during polymerization is to add inorganic particles, dispersant, an appropriate amount of terminal group regulator, weathering agent, and antioxidant to the aqueous solution of the polyamide raw material monomer when preparing the polymer raw material preparation liquid, and stir, Mixing, dissolving, and dispersing are performed in a cycle. In order to achieve good dispersion, it is preferable to add the inorganic particles after mixing the dispersant and the acid terminal group regulator in advance. Thereby, through the interaction between the dispersant and the components covering the surface of the inorganic particles, the aggregation of the inorganic particles and the generation of coarse particles in the polymer can be suppressed.

・Dispersant When the inorganic particles are barium sulfate, titanium oxide, magnesium oxide, or aluminum oxide, the dispersant is preferably polyacrylic acid. The content of the dispersant is appropriately adjusted according to the content of the inorganic particles. When the content of polyacrylic acid is 0.01~0.15% relative to the inorganic particles, good dispersion can be obtained, which is better.

(melt kneading) In the case of melt-kneading, it is preferable to use an extruder or the like to knead the polyamide fragments and inorganic particles having a C7 or higher aliphatic hydrocarbon chain used in the present invention in a molten state. In addition, even in this case, the same dispersant as described above can be used.

・Melt viscosity When adding by melt kneading, it is preferable to set the melt viscosity of the polyamide melting temperature to 3500 poise or less. By setting the melt viscosity below 3500 poise, even if the kneading after adding inorganic particles is intensified, the inorganic particles can still be well dispersed, and the aggregation of the inorganic particles and the generation of coarse particles in the polymer can be suppressed. In addition, 1poise=0.1Pa·s.

If the melt-kneading method is exemplified, for example, a method of blending and melting inorganic particles into chips, a method of blending and melting masterbatch chips containing high-concentration inorganic particles with chips, and adding inorganic particles to a molten polymer can be used. Inorganic particles are melted and kneaded using any method. In the case of the masterbatch chip blending method, in order to prevent a decrease in concentration uniformity due to aggregation of inorganic particles, it is preferable to set the particle concentration of the masterbatch chips to 20 mass % or less.

・Melt filtration After melting and kneading, it is preferable to disperse the agglomerated inorganic particles. Here, during melt extrusion, filtration is preferably performed through a filtration filter. The filter used for filtration is preferably a filter made of SAS nonwoven fabric with a pore size of less than 50 microns.

＜Silk making＞ For the addition of inorganic particles, the polymer is melted according to conventional methods during polymerization, and in the case of melting and kneading, the above-mentioned melt viscosity, kneading method, and melt filtration are used to filter the melted polyamide polymer. The gear pump is used to reduce the weight and transport, and then it is discharged from the spinning outlet, passing through a steam ejection device that injects steam toward the surface of the spinning outlet located directly below the spinning outlet, and the steam injection device An area is provided at the downstream end and the cooling air flow is blown out from the cooling device to cool and solidify the threads to room temperature. Then, the oil supply device is used to supply oil to bundle the threads, and the fluid interlacing nozzle device is used to intertwine, and then passes through the traction roller, Extension roller. At this time, the wire is stretched according to the circumferential speed ratio of the traction drum and the stretching drum. Furthermore, the yarn is heated and heat-set using a drawing roller, and is then wound up using a winding machine (winding device).

In the case of drawing yarn, it is better to make yarn with a high draft ratio and low stretching ratio, which can prevent the occurrence of loose hair balls. The draft is preferably set to 100~300, and the stretch ratio is preferably set to 1.1~2.0 times. By setting a high draft ratio, the fiber structure is stable until stretching. By stabilizing the extension point during stretching, it helps to suppress the occurrence of loose hair balls. The so-called "draft ratio" refers to the value of the peripheral speed of the traction drum divided by the linear speed of the spinning nozzle, and is calculated according to the following formula. Draft ratio = (circular speed of traction drum)/(discharge linear speed)

The polyamide multifilament of the present invention is not limited to the above-mentioned manufacturing method. Highly oriented unstretched yarns that are not stretched between the drawing drum and the drawing drum can also be used. Furthermore, the polyamide multifilament yarns that are stretched after obtaining the unstretched yarns can also be used. Manufacturing is carried out step by step.

When the polyamide multifilament of the present invention is formed into a highly oriented unstretched yarn, the yarn processing can be carried out by a commonly used method. The yarn processing system can be appropriately selected, such as friction false twisting, spindle false twisting, composite false twisting, etc.

[Fabric] The present invention also relates to a fabric partially containing the above-mentioned polyamide multifilament yarn. The polyamide multifilament yarn of the present invention can be woven into a fabric by using commonly used methods. The weaving system of the fabric can be appropriately selected from general fabric weaves such as plain weave, woven weave, satin weave, rib weave such as yarn or quilted weave, dobby weave, jacquard weave, etc.

The polyamide multifilament system of the present invention can be directly used in woven fabrics. The fabric can also be further formed and then dyed or post-processed. The relevant final setting conditions can also be implemented according to known methods. The dye system can use acid dyes and reactive dyes. Of course, the color is not limited.

The polyamide multifilament of the present invention is preferably used in outdoor jackets and down jackets, but by appropriately selecting the fabric structure, it can also be used in shirts, underwear, etc. [Example]

Hereinafter, the present invention will be described in more detail using examples.

A.Strength and elongation The fiber sample was measured according to JIS L1013 (2010) tensile strength and elongation. The test conditions are based on the type of testing machine: constant speed tension type, gripping interval of 50cm, and stretching speed of 50cm/min. In addition, when the strength at the time of cutting is less than the maximum strength, the maximum strength and the elongation at that time are measured. Strength and elongation are determined according to the following formula. Strength = strength when cut (cN)/denier (dtex) Elongation = elongation when cutting (%)

B. Fineness Install the fiber sample on a 1.125m/turn loom and perform 500 rotations to make a ring-shaped skein. After drying with a hot air dryer (105±2°C, 60 minutes), use a scale to weigh the skein quality. The fineness (dtex) is calculated by multiplying the standard moisture regain.

C. Relative viscosity of sulfuric acid Dissolve 0.25g of the polyamide fragment sample or the fiber sample into 100 ml of sulfuric acid with a concentration of 98% by mass, and measure the flowing time (T1) at 25°C using an Oswald viscometer. Next, the flowing time (T2) of only sulfuric acid with a concentration of 98% by mass was measured. Let the ratio of T1 to T2 (ie, T1/T2) be the relative viscosity of sulfuric acid.

D. Inorganic particle content (ash content) The fiber sample was measured according to JIS L1013 (2010) ash content. The crucible was hollow-fired in an electric furnace set at 800°C for 2 hours, and then cooled for 1 hour before precision weighing (A1) was performed. The fiber sample (S) dried to a moisture content of less than 300 ppm was weighed in the crucible, and heated and burned using an electric furnace and a gas burner. Next, the crucible was heated in an 800°C electric furnace for 2 hours, cooled for 1 hour, and then accurately weighed. Repeat using the electric furnace and gas burner to heat and burn, use the electric furnace to heat, and cool the precision scale until it reaches the same value as the previous precision scale result. Let the precision weighing result obtained in this way be (A2), and calculate the inorganic particle content according to the following formula. Inorganic particle content (mass %) = (A2-A1)/S×100.

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

F.Storage elastic modulus The fiber sample was evaluated for dynamic viscoelasticity during temperature scanning from 35°C to 100°C using an automatic dynamic viscoelasticity measuring instrument DDV-GP (Rheovibron) manufactured by AND Corporation. The viscoelastic behavior at two levels, such as 50°C and 80°C, was analyzed by considering the temperature of the yarn when it passes through mechanical contact parts such as the yarn guide. Since elastic behavior dominates in this temperature range, it represents the storage elastic modulus.

G. Kinetic friction coefficient between wire and metal The friction coefficient of the running yarn manufactured by Yingko Industrial Co., Ltd. is measured using the tension notch ring yarn guide 8, tension measurement parts 9, 10, tension roller 11, drive unit 12, data processing part, and recorder shown in Figure 2. Device, set the running wire path of the measuring wire as shown in Figure 2. The tension roller 11 is a fixed metal cylinder with a surface of 15 mm in diameter and 100 mm in length that is mirror-like plated with metallic chromium. The measuring wire is contacted with the tension roller 11 (metal friction body d) at 90°, and the running speed of the wire is set to 2.5m/min, and set the thread tension (T1) before contacting the tension roller 11 (metal friction body d) to 10cN, and run for 60 seconds. At this time, the yarn tension before contacting the tension roller 11 (metal friction body d) (T1, tension measurement part 9) and the yarn tension after contact (T2, tension measurement part 10) are continuously measured, and recorded in the recorder. . Let the average values recorded in the recorder be (T1) and (T2), and calculate the dynamic friction coefficient (μd) between the wire and the metal using the following equation. Dynamic friction coefficient (μd)=1/(0.5×π)×log(T2/T1)

H. Number of loose hair balls The fiber sample was rewinded at a speed of 600m/min for 40 minutes. An MFC-200 laser ball detector manufactured by Toray Engineering was installed 15mm away from the running yarn during rewinding. The number of defects is converted into the number per 10000m.

I. Evaluation of fabric products (a) Ventilation The fabrics obtained in Examples and Comparative Examples were evaluated for air permeability. The air permeability is measured according to JIS L1096 (2010) and the air permeability Fraser method (A method). The same fabric was measured three times, and a four-stage evaluation was performed based on the average value according to the following standards. 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 Set A and B as qualified.

(b) Product quality The fabric is visually inspected for spots and streaks every 50 meters, and evaluated based on the following standards. A: No streaks or spots, excellent quality. B: Although some micro streaks and spots are produced, there will be no problems when using it as finished products. C: Streaks or spots are produced and the product cannot be used. Set A and B as qualified.

(c) High-order step smoothness (abbreviated as “high-order smoothness” in the table) A water-jet shuttleless loom was used to weave 10 pieces of flat fabric (1000m/piece) using a loom speed of 750rpm and a weft length of 1620mm. The number of downtimes caused by broken filaments at this time was evaluated according to the following criteria. A: Less than 2 times B: More than 2 times and less than 4 times C: More than 4 times but less than 6 times D: More than 6 times Set A and B as qualified.

[Example 1] (Production of polyamide multifilament) Polyamide 610 having a C8 aliphatic hydrocarbon chain between amide bonds was used (sulfuric acid relative viscosity: 2.7, melting point: 225°C, melt viscosity at 280°C Masterbatch chips of polyamide 610 containing 20% by mass of titanium oxide were produced with a specific gravity of 700poise, a specific gravity of 1.07g/cm ³ and a melt density of 0.92g/cm ³ ). The titanium oxide content in the silk was adjusted to 0.3% by mass to obtain polyamide 610 chips to which 1.5% by mass of the masterbatch chips were added. The moisture content of the fragments was adjusted to 0.14% by mass, put into the spinning machine shown in Figure 1, melted at a spinning temperature of 280°C, filtered using a nonwoven filter made of SAS with a pore size of 10 microns, and then discharged from the 96-hole tool. The spinning and spinning nozzle 1 with a round hole with a hole diameter of 0.20mm and a hole length of 0.70mm can be spun with an output of 39.6g/min (discharge linear speed of 19.8m/min). The spun yarn is cooled and solidified by blowing cold air from the cooling device 2. After oil is supplied by the oil supply device 3, it is interlaced with the fluid interlacing nozzle device 4, and then the traction drum 5 is used to follow the circumferential speed (traction speed) of 3460m/min (set value , draft ratio 175.1) to perform traction. Then, the thread drawn by the drawing roller 5 is drawn by the stretching roller 6 with a surface temperature of 170°C, and then stretched between the rollers (between the roller 5 and the roller 6) to an extension magnification of 1.30 times, and is wound up by the winding machine 7 Winding at a speed of 4500m/min (set value), four polyamide 610 multifilaments of 22dtex-24 filaments were obtained. The obtained polyamide multifilament yarn was evaluated for its fineness, strength and elongation, and the number of loose balls per 10,000 meters. The results are shown in Table 1. In addition, the CV value of ash content variation in the fiber longitudinal direction is 0.1.

(Manufacturing of fabrics) The 1,000 obtained multifilament yarns were warped and rolled into bundles, and then the yarns that had been wound into bundles were pasted, dried, and then prepared for warp yarn preparation. Then, the obtained multifilament is embedded into the weft yarn through the reed of a water-jet loom to produce a plain fabric. The woven fabric is scouring, heat-set at 170°C (intermediate setting), dyed, and calendered at 170°C to obtain fabric for outdoor jackets. The obtained fabric was evaluated, and the results are shown in Table 1.

The fabric manufacturing steps are extremely smooth. The air permeability characteristics are also excellent, and the product quality is also excellent.

[Table 1] Table 1 Example 1 Example 2 Example 3 Comparative example 1 Example 4 Example 5 Comparative example 2 Example 6 Example 7 Comparative example 3 polymer Polymer type N610 N610 N610 N610 N610 N610 N610 N610 N610 N610 Relative viscosity of sulfuric acid 2.7 2.7 2.7 2.7 2.7 2.7 2.7 2.7 2.7 2.7 Biobased carbon concentration (%) 63 63 63 63 63 63 63 63 63 63 raw silk Types of inorganic particles titanium oxide barium sulfate magnesium oxide titanium oxide titanium oxide titanium oxide titanium oxide titanium oxide titanium oxide titanium oxide Inorganic particle content (mass %) 0.3 0.5 0.04 0 0.01 5 6 0.3 0.3 0.3 Fineness (dtex) twenty two twenty two twenty two twenty two twenty two twenty two twenty two 35 twenty two twenty two Number of threads twenty four twenty four twenty four twenty four twenty four twenty four twenty four 72 20 7 Single filament fineness (dtex) 0.92 0.92 0.92 0.92 0.92 0.92 0.92 0.49 1.10 3.14 Strength(cN/dtex) 5.0 5.0 5.0 4.8 4.9 4.5 4.1 3.7 3.5 5.3 Elongation(%) 48 48 48 47 48 47 47 65 80 48 Storage elastic modulus 50°C (GPa) 3.2 3.2 3.2 3.5 3.4 2.9 2.5 3.1 3.0 3.3 Storage elastic modulus 80°C (GPa) 2.4 2.4 2.4 2.5 2.4 2.0 1.8 2.3 2.2 2.5 Dynamic friction coefficient (μd) 0.4 0.4 0.4 1.2 0.6 0.3 0.3 0.6 0.5 1.1 Loose hair balls (pieces/10,000 m) 0 0 0.4 2.9 0.8 0.8 2.1 0.8 0.4 0 fabric evaluation Ventilation A A A B A A B A B D Product quality A A A C A B C B A A High level smoothness A A A C B B D B A A N610: Polyamide 610

[Example 2] Except that the added inorganic particles were changed to barium sulfate and the content in the silk was changed to 0.5% by mass, the same method as in Example 1 was followed to obtain a polyamide 610 multifilament of 22dtex-24 yarns. Fabric was produced according to the same method as Example 1. The evaluation results are shown in Table 1.

[Example 3] Except that the added inorganic particles were changed to magnesium oxide and the content in the silk was changed to 0.04% by mass, the same method as in Example 1 was followed to obtain a polyamide 610 multifilament of 22dtex-24 filaments. Fabric was produced according to the same method as Example 1. The evaluation results are shown in Table 1.

[Examples 4 and 5, Comparative Examples 1 and 2] Except for changing the titanium oxide content as described in Table 1, the same method as in Example 1 was followed to obtain polyamide 610 multifilament of 22dtex-24 filaments, and the fabric was produced in the same method as in Example 1. The evaluation results are shown in Table 1.

[Example 6] In addition to using a spinning nozzle with 144 round holes with a discharge hole diameter of 0.20mm and a hole length of 0.70mm, no stretching (stretch ratio 1.0 times) was performed, and the winding speed was changed to 3500m/min. In the rest, the same method as in Example 1 was followed to obtain 44dtex-72 highly oriented unstretched yarns formed from polyamide 610 multifilament yarns.

(Wire processing) The obtained high-alignment unstretched yarn is subjected to stretch friction and false twisting processing using a triaxial friction-type friction disc-type stretch friction and false twisting device. From a supply drum with a peripheral speed of 550m/min, it is supplied to a contact type false twist heater heated to 170°C, with an extension of 1.5 times, a disc rotation speed of 7500rpm, a disc diameter of φ51, a D/Y ratio of 2.18, and a false twist coefficient of 30000 Perform stretching and synchronous false twist processing to obtain 35dtex-72 false twisted yarn made of polyamide 610 (D: supply drum speed (m/min), Y: disc rotation speed (m/min)). Using the obtained false-twisted yarn, a fabric was produced in the same manner as in Example 1. The results are shown in Table 1.

[Example 7] In addition to using a spinning nozzle with 60 round holes with a discharge hole diameter of 0.20mm and a hole length of 0.70mm, no stretching (stretch ratio 1.0 times) was performed, and the winding speed was changed to 4000m/min. In the rest, the same method as in Example 1 was followed to obtain a 26dtex-20 highly oriented unstretched yarn formed from polyamide 610 multifilament. The yarn was processed in the same manner as in Example 6 to obtain a false-twisted yarn of polyamide 610 with 22 dtex-20 yarn counts. Using the obtained false-twisted yarn, a fabric was produced in the same manner as in Example 1. The results are shown in Table 1.

[Comparative example 3] Use a spinning nozzle with 28 round holes with a discharge hole diameter of 0.30mm and a hole length of 0.75mm, set the elongation ratio to 1.5 times, and change the winding speed to 4500m/min. The rest are implemented in accordance with In the same method as Example 1, polyamide 610 multifilament yarn with 22dtex-7 branches was obtained, and fabrics were produced in the same method as Example 1. The evaluation results are shown in Table 1.

[Example 8] In addition to using polyamide 510 with an aliphatic hydrocarbon chain of C8 between the amide bonds (relative viscosity of sulfuric acid: 2.8, melting point: 225°C, melt viscosity at 280°C is 800 poise, specific gravity: 1.07g/cm ^3. The melt density is 0.92g/cm ³ ), and the stretching ratio is changed to 1.4 times. The rest are carried out in the same manner as in Example 1 to obtain polyamide 510 multifilament of 22dtex-24 filaments. According to the implementation Make the fabric in the same way as Example 1. The evaluation results are shown in Table 2.

[Table 2] Table 2 Example 8 Comparative example 4 Comparative example 5 Example 9 Comparative example 6 Comparative example 7 Example 10 Comparative example 8 Comparative example 9 Reference example 11 polymer Polymer type N510 N510 N510 N410 N410 N410 N11 N11 N11 N6 Relative viscosity of sulfuric acid 2.8 2.8 2.8 2.8 2.8 2.8 2.0 2.0 2.0 2.7 Biobased carbon concentration (%) 100 100 100 73 73 73 100 100 100 0 raw silk Types of inorganic particles titanium oxide titanium oxide titanium oxide titanium oxide titanium oxide titanium oxide titanium oxide titanium oxide titanium oxide titanium oxide Inorganic particle content (mass %) 0.3 0 6 0.3 0 6 0.3 0 6 0 Fineness (dtex) twenty two twenty two twenty two twenty two twenty two twenty two twenty two twenty two twenty two twenty two Number of threads twenty four twenty four twenty four twenty four twenty four twenty four twenty four twenty four twenty four twenty four Single filament fineness (dtex) 0.92 0.92 0.92 0.92 0.92 0.92 0.92 0.92 0.92 0.92 Strength(cN/dtex) 4.9 4.4 4.3 4.7 4.5 4.4 4.7 4.6 4.5 5.0 Elongation(%) 48 48 47 46 47 46 48 47 46 48 Storage elastic modulus 50°C (GPa) 3.3 3.6 2.9 3.6 3.8 3.2 2.9 3.2 2.3 4.0 Storage elastic modulus 80°C (GPa) 2.4 2.6 2.1 2.9 3.0 2.5 1.9 2.1 1.4 3.3 Dynamic friction coefficient (μd) 0.4 1.1 0.2 0.3 0.9 0.2 0.6 1.3 0.5 0.4 Loose hair balls (pieces/10,000 m) 0.4 2.5 1.7 0 2.1 1.7 0.4 4.2 3.3 0 fabric evaluation Ventilation A B B A B B A B B A Product quality B C C A C C A C C A High level smoothness A D D A D D A D D A N510: Polyamide 516, N410: Polyamide 410, N11: Polyamide 11, N6: Polyamide 6

[Comparative Examples 4 and 5] Except for changing the titanium oxide content as described in Table 2, the same method as in Example 8 was followed to obtain polyamide 510 multifilament of 22dtex-24 filaments, and the fabric was produced in the same method as in Example 1. The evaluation results are shown in Table 2.

[Example 9] In addition to using polyamide 410 with an aliphatic hydrocarbon chain of C8 between the amide bonds (relative viscosity of sulfuric acid: 2.8, melting point: 250°C, melt viscosity at 280°C is 1100 poise, specific gravity: 1.09g/cm ^3. The melt density is 0.94g/cm ³ ), and the stretching ratio is changed to 1.3 times. The rest are carried out in the same manner as in Example 1 to obtain polyamide 410 multifilament of 22dtex-24 filaments. According to the implementation Make the fabric in the same way as Example 1. The evaluation results are shown in Table 2.

[Comparative Examples 6 and 7] Except that the titanium oxide content was changed as described in Table 2, the same method as in Example 9 was followed to obtain polyamide 410 multifilament of 22dtex-24 filaments, and the fabric was produced in the same method as in Example 1. The evaluation results are shown in Table 2.

[Example 10] In addition to using polyamide 11 having an aliphatic hydrocarbon chain with a carbon number of C10 between the amide bonds (sulfuric acid relative viscosity: 2.0, melting point: 187°C, melt viscosity at 235°C is 1000 poise, specific gravity 1.03g/cm ^3. The melt density is 0.89g/cm ³ ), except that the melting temperature is changed to 235°C and the elongation ratio is changed to 1.5 times. The rest are carried out in the same manner as in Example 1 to obtain a polyamide of 22dtex-24 filaments. 11 Multifilament, fabricate according to the same method as Example 1. The evaluation results are shown in Table 2.

[Comparative Examples 8 and 9] Except that the titanium oxide content was changed as described in Table 2, the same method as in Example 10 was followed to obtain a polyamide 11 multifilament of 22dtex-24 filaments, and the fabric was produced in the same method as in Example 1. The evaluation results are shown in Table 2.

[Reference Example 11] In addition to using polyamide 6 having an aliphatic hydrocarbon chain with a carbon number of C5 between the amide bonds (relative viscosity of sulfuric acid: 2.7, melting point: 220°C, melt viscosity at 280°C is 1100 poise, specific gravity: 1.14g/cm ^3. The melt density is 0.98g/cm ³ ), and does not contain titanium oxide. Except for changing the stretching ratio to 1.7 times, the rest are in accordance with the same method as in Example 1 to obtain polyamide 6 of 22dtex-24 filaments. Multifilament fabric was produced in the same manner as in Example 1. The evaluation results are shown in Table 2. (industrial availability)

Utilizing the polyamide multifilament of the present invention, it is possible to provide a fabric that suppresses the loosening of hair balls, has excellent smoothness in advanced steps, has low air permeability and excellent product quality, and is suitable for outdoor jackets and the like.

The present invention is described in detail with reference to specific implementation aspects. However, various changes and modifications can be made without departing from the spirit and scope of the present invention, which can be easily understood by those skilled in the art. This application is based on the Japanese patent application (Special Application No. 2022-003499) filed on January 13, 2022, and the content is incorporated in this case with reference to the content.

1: Spinning and spinning nozzle 2: Cooling device 3: Oil supply device 4: Fluid communication nozzle device 5: Traction roller 6:Extension roller 7: Coiling device (winding machine) 8: Tension notch ring wire guide 9: Tension measurement department 10: Tension measurement department 11: Tension roller 12: Drive unit

Figure 1 is an embodiment of a manufacturing device that can be used in the manufacturing method of polyamide multifilament of the present invention. Figure 2 shows a preferred embodiment of a measuring device capable of measuring the dynamic friction coefficient of a thread.

Claims (3)

A polyamide multifilament with a single filament fineness of less than 2.2 dtex, a loose ball number of less than 1 per 10,000 m, a kinetic friction coefficient between silk and metal of less than 0.8 μd, and a carbon number of C7 between the amide bonds. The above aliphatic hydrocarbon chain. Such as the polyamide multifilament yarn of claim 1, which contains 0.01 to 5.0 mass% of inorganic particles. A fabric, a part of which contains the polyamide multifilament of claim 1 or 2.