JP2021143433A - Polyester false twisted yarn - Google Patents

Abstract

To provide a polyester false twisted yarn that is excellent in low friction property, color development, strength and fluff quality, and a polyester false twisted yarn that has high-order passage property, good separability from the skin, a dry feel and color development when the yarn is woven to fabric.SOLUTION: A polyester false twisted yarn contains fatty acid amide compound. The content of the fatty acid amide compound in fibers is 0.5 to 5.0% by mass. Melting point of the fatty acid amide compound in fibers is 160 to 250°C, coefficient of static friction is 0.45 μd or less, and the number of fuzz per 400 m of yarn length is 40 or less. The polyester false twisted yarn is copolymerized polyester that can be dyed with a cationic dye.SELECTED DRAWING: None

Description

The present invention relates to a low friction polyester false twisted yarn having excellent wearing comfort.

Clothing fibers are required to have low friction in order to improve skin separation from the aspect of comfort. Especially in the case of clothing that comes into direct contact with the skin, it is known that high friction between the skin and the clothing causes dry skin. Further, since the fluff contained in the yarn increases the irritation to the skin, a yarn having less fluff is required.

As a method for obtaining a low friction fiber, for example, Patent Document 1 discloses a technique of adding 3.0 to 6.5% of inorganic particles such as titanium dioxide to a polyamide fiber to form irregularities on the fiber surface. ing.

Further, Patent Document 2 discloses a technique of adding 0.1 to 5.0% of ethylene bisstearic acid amide to an example as a lubricant in a polytrimethylene terephthalate polyester fiber.

Japanese Unexamined Patent Publication No. 2004-2929282 Japanese Unexamined Patent Publication No. 2006-183201

However, in Patent Document 1, although low friction is obtained by forming irregularities on the fiber surface, addition of a large amount of titanium oxide, which is a white pigment, causes a decrease in color development. In addition, foreign matter enters the yarn, resulting in a decrease in strength. In addition, in highly rigid polyester, the fiber guides, reeds, needles, etc. are easily worn due to the unevenness of the fiber surface, and not only the yarn process but also the false twisting process, warping process, weaving process, etc. are high. In the next process as well, there was a problem that the yarn was scraped due to wear of the guide and the like, resulting in frequent yarn breakage and fluffing.

Further, in Patent Document 2, the lubricant used has a melting point of 140 ° C. and has low heat resistance. For example, when it is contained in polyethylene terephthalate, the lubricant is thermally decomposed during melt spinning, and the low friction performance is deteriorated. .. As the low friction performance deteriorates, the friction with the twister to be twisted increases and fluffing occurs frequently, and the strength decrease and fluffing combine to cause a problem that yarn breakage frequently occurs in the warping process and the weaving process.

An object of the present invention is to solve the above problems and to provide a polyester false twisted yarn having excellent low friction property, color development property, strength and fluff quality. Further, it is an object of the present invention to provide a polyester false twisted yarn which is excellent in high-order passability, has a smooth texture and is excellent in color development when used as a fabric.

The subject of the present invention is
(1) Made of a cationic dyeable copolymerized polyester containing 0.5 to 5.0% by mass of a fatty acid amide compound having a melting point of 160 to 250 ° C., a static friction coefficient of 0.45 μd or less, and fluff per yarn length of 400 m. Polyester false twisted yarn with 40 or less.
(2) The polyester false twisted yarn according to (1), wherein the fatty acid amide compound is a condensed compound composed of a dicarboxylic acid and a diamine, or a condensed compound composed of a monocarboxylic acid, a dicarboxylic acid and a diamine. ..
(3) The polyester false twisted yarn according to (1) or (2), wherein the crimp restoration rate (CR) is 15% to 30%.
Can be solved by.

According to the present invention, it is possible to provide a polyester false twisted yarn having excellent low friction property, color development property, strength and fluff quality, which could not be achieved by the prior art. Further, it is possible to provide a polyester false twisted yarn which is excellent in high-order passability and can obtain a smooth texture and color development property when it is used as a fabric.

The polyester false twisted yarn of the present invention contains a fatty acid amide compound. By containing the fatty acid amide compound, the fatty acid amide compound bleeds out on the fiber surface after melt spinning to uniformly coat the fiber surface and impart low friction to the fiber. When used as a fabric, it gives a smooth texture that is easy to remove from the skin. Furthermore, the fatty acid amide compound acts as an auxiliary agent during dyeing to develop deep color development. Further, since the low friction performance is exhibited even before the false twisting process, the friction with the twister to be twisted is reduced, and the false twisted yarn having excellent fluff quality can be obtained.

The content of the fatty acid amide compound is 0.5 to 5.0% by mass. By setting the content of the fatty acid amide compound to 0.5% by mass or more, when bleeding out to the fiber surface after melt spinning, the fiber surface is uniformly coated to impart low friction to the fiber, and the fabric and the fabric When you do this, you can get a smooth texture that is easy to remove from the skin. Further, by setting the content of the fatty acid amide compound to 5.0% by mass or less, fibers having good yarn strength can be obtained, and false-twisted yarn having excellent fluff quality can be obtained, resulting in higher passability. Excellent. Further, from the viewpoint of an auxiliary agent for color-developing property, the higher the content of fatty acid amide, the higher the effect as an auxiliary agent for color-developing property. If the content of the fatty acid amide compound exceeds 3.0% by mass, the fluff quality and higher passability are lowered, so that the content is preferably 0.7 to 3.0% by mass.

The melting point of the fatty acid amide compound is 160 ° C to 250 ° C. The melting point of the fatty acid amide compound referred to here is measured by measuring the fatty acid amide compound extracted from the fiber with a differential scanning calorimeter. By setting the melting point of the fatty acid amide compound to 160 ° C. or higher, the fatty acid amide compound can be coated with fibers even when the melting temperature is 275 ° C. or higher without thermal deterioration, and fibers having excellent low friction can be obtained. By setting the melting point of the fatty acid amide compound to 250 ° C. or lower, the viscosity of the fatty acid amide compound can be kept low during melt spinning, and the fatty acid amide compound is uniformly dispersed in the fibers. By uniformly dispersing the fatty acid amide compound, the number of places where the content of the fatty acid amide compound is locally increased is reduced, and a fiber having good yarn strength can be obtained. When the melting point exceeds 250 ° C., the fatty acid amide compound at the time of melt spinning is high in viscosity and the dispersibility is lowered, so that the fatty acid amide compound varies in the longitudinal direction of the yarn and a portion having weak strength is generated. The strength decreases. Furthermore, the frictional property does not decrease locally, and a large amount of fluff is generated in the obtained false twisted yarn. Therefore, by limiting the melting point of the fatty acid amide compound, the thermal deterioration and dispersibility of the fatty acid amide compound are controlled during melt spinning, the low friction property of the fiber is exhibited, and the fabric is easily separated from the skin. A smooth texture can be obtained. In addition, a false twisted yarn having excellent strength and fluff quality can be obtained, and has excellent high-order passability. More preferably, it is 180 to 230 ° C.

The fatty acid amide compound contained in the present invention is preferably a condensed compound composed of a dicarboxylic acid and a diamine, or a condensed compound composed of a monocarboxylic acid, a dicarboxylic acid and a diamine. Further, it is more preferable that the compound has four or more amide bonds in one molecule.

A compound having four or more amide bonds in one molecule has a strong intermolecular force, the melting point of the fatty acid amide compound rises, and the heat resistance is improved. The fatty acid amide compound with improved heat resistance has good yarn strength without thermal deterioration even when melt-spun at a polyester melt temperature of 275 ° C or higher, and produces processed yarn with excellent low friction and color development. Obtainable.

Moreover, the melting point is further increased by selecting the polymer species to be condensed. Examples of the monocarboxylic acid include lauric acid, myristic acid, stearic acid, and asakidic acid, which may be used alone or in combination of two or more. Examples of the dicarboxylic acid include oxalic acid, malonic acid, succinic acid, adipic acid, sebacic acid, phthalic acid, terephthalic acid and the like, and may be used alone or in combination of two or more. Examples of the diamine include ethylenediamine, hexamethylenediamine, m-xylylenediamine, ferrenideamine, etc., which may be used alone or in combination of two or more.

The coefficient of static friction of the polyester false twisted yarn of the present invention is 0.45 μd or less. By setting the coefficient of static friction to 0.45 μd or less, a smooth texture and comfort that is easy to remove from the skin can be obtained when the fabric is used. If the coefficient of static friction exceeds 0.45 μd, the skin will not come off easily and the texture will change when the fabric is made. More preferably, it is 0.35 μd or less.

The number of fluffs of the polyester false twisted yarn of the present invention is 40 or less per 400 m of yarn length. By setting the number of fluffs to 40 or less, for example, in a warping process or a weaving process, it is possible to suppress yarn breakage due to the fluff portion being caught by a fiber guide, a reed or a knitting needle, and it is excellent in high-order passability. In addition, there is little irritation to the skin when it is used as clothing, and a smooth texture and comfort that is easy to remove from the skin can be obtained. When the number of fluffs is more than 40, many yarn breaks occur in the warping process and the weaving process. In addition, the irritation to the skin when it is used as clothing increases, and it becomes uncomfortable to wear. More preferably, the number is 30 or less per 400 m.

The preferably used strength of the polyester false twisted yarn of the present invention is 2.40 to 3.50 cN / dtex. By setting the strength to 2.40 cN / dtex or more, it is possible to suppress the generation of fluff and thread breakage due to rubbing with a fiber guide or the like in high-order processing, and it is excellent in high-order passability. Furthermore, the strength of the dough can be secured.

The crimp restoration rate (CR) preferably used for the polyester false twisted yarn of the present invention is 15% to 30%. By setting the crimp restoration rate (CR) to 15% or more, the length of the thread that comes into contact with the skin when the fabric is made can be shortened, and a smooth texture and comfort that is easy to remove from the skin can be obtained.

The polyester false twisted yarn of the present invention is composed of a copolymer in which an isophthalic acid component containing a metal sulfonate group and a polyalkylene glycol component are copolymerized, and has an ester bond formed from terephthalic acid or an ester-forming derivative thereof and ethylene glycol. Examples thereof include a copolymerized polyester which is a melt-formable polymer having.

The copolymerized polyester preferably dyeable with the cationic dye used in the present invention contains at least 80 mol% or more of ethylene terephthalate units, and the isophthalic acid component containing a metal sulfonate group is preferably 0.7 with respect to all carboxylic acids. A polyalkylene glycol component that is ~ 2.4 mol% copolymerized and preferably has a weight average molecular weight of 90 ~ 6000 can be dyed with a cationic dye that is preferably 0.2-10% by weight copolymerized with respect to the polyester. Copolymerized polyester can be mentioned.

Examples of isophthalic acid containing a metal sulfonate group include dimethyl (5-sodium sulfo) isophthalic acid and bis-2-hydroxyethyl (5-sodium sulfo) isophthalic acid. Further, as a representative example of the polyalkylene glycol component used in combination, the following general formula _{HO- (CH 2 -CH 2 -O)} m-R-O- (CH 2 -CH 2 -O) nH
(In the formula, R represents a divalent aliphatic hydrocarbon group having a linear, cyclic or side chain having 2 to 20 carbon atoms, and m and n are the same or different integers and 1 ≦ m + n ≦ 100. ), Glyco, bisphenol A-ethylene oxide adduct, and the like.

By adding the fatty acid amide compound to the copolymerized polyester that can be dyed with the cationic dye of the present invention, the fatty acid amide compound acts as an auxiliary agent and can develop a deep color that could not be expressed by the usual false twisted yarn. can.

The polyester may be copolymerized or mixed with a second component or a third component such as various additives without departing from the object of the present invention. Examples of the additive include a matting agent, a flame retardant, an antioxidant, an ultraviolet absorber, an infrared absorber, and a fluorescent whitening agent.

Next, a method for producing the polyester false twisted yarn of the present invention will be described.
In the polyester false twisted yarn of the present invention, low friction is imparted to the fiber by uniformly coating the surface of the fiber with a fatty acid amide compound. By kneading the fatty acid amide compound directly into the polymer as a method of coating the fiber surface, the fatty acid amide compound bleeds out on the fiber surface after melt spinning, and it becomes possible to coat the fiber surface thinly and uniformly, and static friction is achieved. It is possible to control the coefficient within such a range. On the other hand, as another method of coating the fiber surface, there is a method of directly applying to the fiber surface and the fabric surface such as a spinning oil agent, a false twisting oil agent, and post-processing, but such a method coats the fiber thinly and uniformly. Not only is it difficult, but it also has a surface where the coating easily falls off due to washing or the like, so it is difficult to control the coefficient of static friction within such a range. As a method of kneading the fatty acid amide compound directly into the polymer, 95.0 to 99.5% by mass of the copolymerized polyester dyeable with a cationic dye and 0.5 to 5.0% by mass of the fatty acid amide compound are weighed and blended. Next, kneading is performed using a single-screw extruder, a twin-screw extruder, or the like to cool the chips once, or the chips are continuously fed into a spinning device in a molten state, weighed, and then melt-spun. Once chipped, the fatty acid amide compound content in the fiber may be 0.5 to 5.0% by mass by diluting in the spinning step.

The melting temperature at this time is 275 to 295 ° C. Within this range, thermal deterioration of the copolymerized polyester and the fatty acid amide compound that can be dyed with a cationic dye can be suppressed, fibers with less spun yarn breakage can be produced, and good yarn strength for clothing can be obtained.
The polymer flow discharged from the mouthpiece is cooled and solidified according to a conventional melt spinning method, then an oil agent is applied, and the polymer flow is taken up by a roller having a specified peripheral speed to obtain a partially oriented undrawn yarn.

Next, the polyester false twisted yarn of the present invention can be obtained by drawing and false twisting the partially oriented undrawn yarn by a generally known method.
The false twisting tool of the stretch false twisting apparatus used for the stretch false twisting process is not particularly limited as long as it is used in the normal drawing false twisting process such as a pin, a friction disc, and a belt nip. This is a processing method in which false twisting is performed while drawing a partially oriented undrawn yarn. The yarn is twisted while being heated, and is untwisted after passing through the false twisting tool to have a bulky texture.

The false twist number T is preferably 15000 / (total fineness) ^1/2 ≤ T ≤ 35000 / (total fineness) ^1/2 . For example, when a friction disc is used, the thickness of the disc, the spacing between the discs, the number of discs, and the like may be adjusted in an appropriate manner, and the false twist number T may be set within the above range.
The processing speed is preferably in the range of 300 to 800 m / min. If it is produced in this range, it can be produced in good yield without frequent yarn breakage.
The draw ratio needs to be optimized depending on the spinning conditions and processing conditions, but a range of 1.2 to 2.0 times is appropriate.

As the heating method of the first heater, both a contact type and a non-contact type can be used. The temperature of the first heater varies depending on the heating method, the processing speed, and the fineness of the yarn, and the heater temperature is set so that the temperature of the yarn passing through the inside of the heater is in the range of 100 to 230 ° C.
It is preferable to apply entanglement and oil before winding the false twisted yarn into the package. As a result, the unresolvability is improved, and the process passability during knitting and weaving is improved.

Hereinafter, examples will be specifically described. The main measured values of the examples were measured by the following methods.

(1) Number of fluffs per 400 m of yarn length A polyester false twisted yarn was measured using an S-type fluff detector DT-104 model manufactured by Toray Engineering Co., Ltd. The distance between the running yarn and the fluff detection sensor was 1.5 mm, and the number of fluffs detected was measured at a yarn speed of 200 m / min for 2 minutes. Initial tension (cN) = fineness (dtex) / 11. The measured value was measured three times and used as the average value.

(2) Strength According to JIS L1013 (2010), polyester false twisted yarn was measured with Tencilon UCT-100 manufactured by Orientec.

(3) Content of fatty acid amide compound in fiber The polyester false twisted yarn was dissolved in an aqueous sodium hydroxide solution having a concentration of 4% and a temperature of 98 ° C., and the residue was collected. The obtained residue was dissolved in ethanol and the insoluble matter was removed by filtration. A fatty acid amide compound is obtained by evaporating the ethanol of the obtained filtrate. The weight of the obtained fatty acid amide compound was measured. The measured value was measured three times and used as the average value.

(4) Melting point of fatty acid amide compound in fiber The melting point of the fatty acid amide compound obtained by the same method as described in (3) was measured by a differential scanning calorimeter.

(5) Static friction coefficient Initial tension (cN) = fineness (dtex) / 11, 10,000 m of yarn was wound around a plate with a width of 5 cm, and the wound yarn was used for measurement according to JIS P8147. 0.45 μd or less was regarded as acceptable.

(6) Shrinkage restoration rate CR
The false twisted yarn is wound 10 times with a measuring machine having a circumference of 1.0 m to remove the skein, and then the skein is subjected to an initial load of fineness × 0.002 × number of windings × 2 / 1.111 g to 90. Treat with hot water at ° C. for 20 minutes, leave for 12 hours or more after dehydration. After leaving the skein, apply a measurement load of initial load and fineness x 0.1 x number of windings x 2 / 1.111 g, hang it in water, and leave it for 2 minutes. Measure the length of the left-over skein and let it be L. Further, leave it for 3 minutes with only the initial load excluding the measured load, measure the length of the skein, and set it as L1. The expansion / contraction restoration rate CR was calculated by the following equation.
Expansion and contraction restoration rate CR (%) = {(L-L1) / L} x 100.

(7) High-order passability A circular knitted fabric was knitted with a knitting machine manufactured by SANTEC Corporation. The knitting conditions were such that the knitting speed was 20 rpm, the knitting was performed at a basis weight of 100 g / m ² and the knitting was performed at 20000 m, and the knitting yarn breakage at this time was evaluated according to the following criteria. The passing level is ◎, 〇, △.
◎: 0 times ○: 1 time △: 2 to 4 times ×: 5 times or more.

(8) Color development The fabric prepared in (7) was dyed by the following dyeing method, compared with a standard sample containing no fatty acid amide compound dyed in the same manner, and evaluated by five experts according to the following criteria. went. The pass is ○ or higher.
◎: Excellent ○: Good ×: Equivalent [Dyeing conditions]
Dye-Eisen Carotene Blue GLH 0.7% O.D. W. F.
Dyeing aid-sodium acetate 0.15 g / L, acetic acid (100%) 0.5 mL / L
Bath ratio-1: 100
Dyeing-50 ° C. x 15 minutes treatment, then the temperature is raised at a rate of 1.6 ° C./min, and the treatment is performed at 98 ° C. x 20 minutes.

(9) Texture The fabric prepared in (7) was dyed blue and compared with a standard sample that did not contain the fatty acid amide compound that was dyed in the same manner. The evaluation was performed according to the following criteria. Passes are ◎ and ○.
◎: Excellent ○: Good ×: Equivalent (Example 1)
Copolymerized polyethylene terephthalate, ethylenediamine, and stear, in which dimethyl (5-sodium sulfo) isophthalic acid is 1.6 mol% based on total carboxylic acid and polyethylene glycol having a weight average molecular weight of 1000 is 1.2% by mass based on polyester. A fatty acid amide compound, which is a condensed compound of acid and sebacic acid, is blended at a weight ratio of 99: 1, melted at 290 ° C., weighed and discharged by a gear pump, and built-in spinning pack (temperature 290 ° C.). A molten polymer was derived from the spun cap and spun from the spun cap. A SUS non-woven fabric filter (nonwoven fabric thickness: 0.6 mm) having an absolute filtration diameter of 15 μm was incorporated directly above the base of the spinning pack. After spinning, the yarn was cooled and solidified with cooling air at a temperature of 20 ° C. and a speed of 0.3 m / sec, an oil agent was applied by an oil supply device, and the yarn was wound at a spinning speed of 3000 m / min.

This partially oriented undrawn yarn (POY) is set to a false twist heater temperature of 160 ° C. and a draw ratio of 1.80 by a friction false twister, drawn false twisted, entangled, wound around a paper tube, and polyester temporary twisted. A twisted yarn was obtained. The results are shown in Table 1.

(Examples 2 to 5)
The same procedure as in Example 1 was carried out except that the content of the fatty acid amide compound was changed as shown in Table 1. The results are shown in Table 1.

(Examples 6 to 9)
The same procedure as in Example 1 was carried out except that the fatty acid amide compound species was changed and the melting point was changed as shown in Table 1. The results are shown in Table 1.

(Examples 10 to 14)
The same procedure as in Example 1 was carried out except that the polymer was changed as shown in Table 1. The results are shown in Table 1.

(Comparative Example 1)
The same procedure as in Example 1 was carried out except that the content of the fatty acid amide compound was changed as shown in Table 2. The obtained false twisted yarn was inferior in low friction property, and a smooth texture with good skin release could not be obtained. The results are shown in Table 2.

(Comparative Example 2)
The same procedure as in Example 1 was carried out except that the content of the fatty acid amide compound was changed as shown in Table 2. The obtained false twisted yarn had good low friction, but had a large number of fluffs, low strength, and poor high-order passability. In addition, the irritation to the skin increased and the texture decreased. The results are shown in Table 2.

(Comparative Example 3)
The same procedure as in Example 1 was carried out except that the fatty acid amide compound species was changed and the melting point was changed as shown in Table 2. The results are shown in Table 2.
The false twisted yarn containing an ethylene bisstearic acid amide compound having a low melting point was inferior in low friction and did not have a smooth texture with good release from the skin. In addition, the strength was low, the number of fluffs was large, and the high-order passage was inferior.

(Comparative Example 4)
The same procedure as in Example 1 was carried out except that the fatty acid amide compound species was changed and the melting point was changed as shown in Table 2. The results are shown in Table 2.
False-twisted yarn containing a condensed compound of ethylenediamine and oxalic acid, which has a high melting point, had good low friction, but static friction variation and strength variation in the longitudinal direction of the yarn occurred, the strength decreased, and the number of fluffs increased. It was inferior in higher passability. In addition, the irritation to the skin increased and the texture decreased.

(Comparative Example 5)
The same procedure as in Example 1 was carried out except that 5.0% by mass of titanium oxide was added instead of the fatty acid amide compound. The results are shown in Table 2.
The obtained false twisted yarn had good low friction, but had low strength, a large number of fluffs, and was inferior in high-order passability. In addition, the color was whitish as a whole and the color development was inferior.

Claims (3)

It is made of a cationic dyeable copolymer polyester containing 0.5 to 5.0% by mass of a fatty acid amide compound having a melting point of 160 to 250 ° C., has a static friction coefficient of 0.45 μd or less, and has 40 fluffs per 400 m yarn length. Polyester false twisted yarn with less than one piece. The polyester false twisted yarn according to claim 1, wherein the fatty acid amide compound is a condensed compound composed of a dicarboxylic acid and a diamine, or a condensed compound composed of a monocarboxylic acid, a dicarboxylic acid and a diamine. The polyester false twisted yarn according to claim 1 or 2, wherein the crimp restoration rate (CR) is 15% to 30%.