JP4084258B2 - Cotton-like polyester blend yarn - Google Patents

Description

  The present invention has a cotton-like polyester blend that has a cotton-like texture and appearance, and that can provide a cotton-like polyester fabric that has good resilience and lightness, and is also excellent in dryness and fibrillation. Related to yarn.

  Conventionally, as a method of bringing a synthetic fiber, particularly polyester fiber, close to a cotton-like texture, a method of flattening a cross section by applying false twist crimping to a hollow polyester multifilament (see, for example, Patent Document 1), or the like A method of blending flat hollow polyester multifilaments having crimps and non-crimped hollow polyester multifilaments (for example, see Patent Document 2) has been proposed.

  However, in the former method, since the cross-sectional shape of the filaments constituting the multifilament is flattened by false twist crimping and densely converged, the fabric obtained by the multifilament is only inferior in resilience. There was also a problem that it did not have a lightweight feeling like cotton. The latter method is excellent in resilience and lightness, but is not sufficient in terms of dryness and fibrillation.

On the other hand, the inventors of the present invention previously filed in Japanese Patent Application No. 2003-159052 contain a water-insoluble polyoxyethylene-based polyether and an organic sulfonate salt substantially non-reactive with the polyester in the polyester. A polyester false twist crimped yarn was proposed. According to such a false twist crimped yarn, a fabric having a dry feeling and a fibril feeling can be obtained, but it has been found that a better rebound and light weight are required depending on the application.
Japanese Patent Laid-Open No. 50-36750 Japanese Patent No. 3357784

  The present invention has been made in view of the above-mentioned background, and its purpose is a cotton-like polyester capable of obtaining a cotton-like polyester fabric having good resilience, lightness, and excellent dryness and fibrillation. To provide blended yarn.

  As a result of intensive studies to achieve the above object, the present inventors have incorporated a water-insoluble polyoxyethylene-based polyether and an organic sulfonate salt substantially non-reactive with the polyester into the polyester. It has been found that a desired cotton-like polyester blended yarn can be obtained by blending a polyester false twist crimped yarn and a non-crimped yarn having a hollow cross-section, and the present invention has been further studied through repeated studies. It came to be completed.

Thus, according to the present invention, there is provided “a cotton polyester mixed yarn characterized by including a multifilament crimped yarn a and a multifilament non-crimped yarn b satisfying the following”.
Multifilament crimped yarn a:
A polyester multifilament crimped yarn made of polyester and imparted with crimp, wherein the polyester is a polyether represented by the following general formula, and the molecular weight of the straight chain portion (B) in the following general formula The ratio (nA / nB) of the molecular weight (nA) of the (nB) to the branched portion (A and A ′) is 0.2 to 1.2, and the average molecular weight of the polyether is 5000 to 16000. A polyester multifilament crimped yarn comprising 0.5 to 20% by weight of an oxyethylene-based polyether and 0.1 to 3.0% by weight of an organic sulfonate salt substantially nonreactive with the polyester.
Multifilament non-crimped yarn b:
A polyester multifilament non-crimped yarn which is not crimped and has a hollow portion in the cross-sectional shape of a single fiber constituting the multifilament.

  Further, the crimp rate of the multifilament crimped yarn a is preferably in the range of 2 to 15%. On the other hand, in the cross-sectional shape of the single fiber constituting the multifilament non-crimped yarn b, the hollow ratio is preferably in the range of 10 to 50%.

  As a weight ratio of the multifilament crimped yarn a and the multifilament non-crimped yarn b, a ratio of 7: 3 to 3: 7 in (a: b) is preferable. Furthermore, it is preferable that the multifilament crimped yarn a and the multifilament non-crimped yarn b are subjected to a mixed fiber entanglement process.

  According to the cotton-like polyester blended yarn of the present invention, it is possible to obtain a cotton-like polyester fabric having good resilience, lightness, and excellent dryness and fibrillation, and its industrial value is extremely high. is there.

Hereinafter, embodiments of the present invention will be described in detail.
First, as the polyester for forming the multifilament crimped yarn a in the present invention, an aromatic polyester having an aromatic ring in a polymer chain unit is preferable. As such an aromatic polyester, polyethylene terephthalate, polybutylene terephthalate, polytrimethylene terephthalate, polyethylene naphthalate and the like are particularly suitable. Such polyester contains optional additives such as an antioxidant, an ultraviolet absorber, a heat stabilizer, a flame retardant, titanium oxide, a colorant, and inert fine particles as long as the object of the present invention is not impaired. Also good.

  In the present invention, the polyester forming the multifilament crimped yarn a contains a water-insoluble polyoxyethylene-based polyether and an organic sulfonate as described above, which will be described in detail below.

  First, the polyester forming the multifilament crimped yarn a needs to contain 0.5 to 20% by weight (preferably 1.0 to 5.0% by weight) of a water-insoluble polyoxyethylene-based polyether. . If the content is less than 0.5% by weight, fibrillation will occur, but the amount of expression will be small and the fibrillation and dryness intended by the present invention will not be obtained, which is not preferable. On the other hand, when the content is larger than 20% by weight, fibrillation proceeds, but fibril fibers easily fall off, which is not preferable because of poor practicality.

  It is preferable that the water-insoluble polyoxyethylene-based polyether is a polyether represented by the following general formula.

  Here, the ratio (nA / nB) of the molecular weight (nB) of the linear part (B) to the molecular weight (nA) of the branched parts (A and A ′) is preferably 0.2 to 1.2. More preferably, it is 0.25 to 1.0. When the ratio is less than 0.2, when the polyether is blended into the polyester polymer, the linear portion is too long, resulting in insufficient extension of the molecular chain, or the number of branches The length tends to be insufficient, and the anchor effect necessary for the extension of the molecular chain may not be obtained. As a result, there is a possibility that the fibrillation and dryness intended by the present invention cannot be obtained sufficiently.

  Conversely, if the ratio (nA / nB) exceeds 1.2, the portion that is not a linear portion becomes large, and it becomes difficult for the polyether and polyester to be blended and fibrillation hardly occurs. There is.

  Moreover, it is preferable that the molecular weight of the said polyether is 5000-16000, (preferably 5500-14000). When the molecular weight is less than 5000, the polyether is not stretched to a sufficient length in the false twisted yarn, and there is a possibility that good fibril fibers cannot be obtained. On the other hand, when the molecular weight is larger than 16000, melt miscibility in polyester is lowered, dispersion is likely to be non-uniform, melt spinnability is lowered, and physical properties of the resulting crimped yarn are likely to be lowered. There is.

  On the other hand, the content of the organic sulfonate contained in the polyester forming the multifilament crimped yarn a needs to be 0.1 to 3.0% by weight (preferably 0.2 to 2.0% by weight). There is. The organic sulfonate serves as a base point for alkali weight loss in the molecular structure of the fiber when the fiber is fibrillated by alkali treatment. For this reason, when the content is less than 0.1% by weight, fibrillation by alkali treatment does not proceed sufficiently, which is not preferable. On the other hand, when the content exceeds 3.0% by weight, the mechanical properties and light resistance of the crimped yarn are impaired. Furthermore, the fibrillation is excessively advanced by the alkali treatment, and the strength of the crimped yarn is remarkably lowered, which is not practical.

  As said organic sulfonate, it needs to be substantially non-reactive with polyester, and it is preferable that it is a sulfonic acid metal salt shown by either of following General formula (1)-(4).

In the formula, R ₁ is a monovalent hydrocarbon group, R ₂ is an alkylene group having 2 to 4 carbon atoms, R ₃ is an alkylphenyl group having 10 to 40 carbon atoms, or alkyl naphthyl having 14 to 40 carbon atoms. The compound which is group, a is an integer of 1-100, b is an integer of 2-4, m shows alkali metals, such as Na, K, Li. Such metal salts may be used alone or in combination of two or more.

  The multifilament crimped yarn a is obtained by crimping a multifilament made of polyester containing the water-insoluble polyoxyethylene-based polyether and an organic sulfonate. The method for imparting crimps is not particularly limited, but normal false twist crimping is preferably exemplified. The crimp rate of the crimp is preferably in the range of 2 to 15%. If the crimp rate is less than 2%, the single fibers are likely to converge, and the cotton-like texture that is the object of the present invention may be impaired. On the other hand, if the crimping ratio is greater than 15%, the texture becomes rough and the texture may be impaired.

  The multifilament crimped yarn a can be produced, for example, by the following method. First, the above-described polyoxyethylene-based polyether and organic sulfonate can be contained in the polyester at any stage and by any method as long as the polyester is in a stage before fiberization. . For example, a state in which the polyoxyethylene polyether and the organic sulfonate are dissolved or dispersed in a solvent such as powder or glycol before the start of the polycondensation reaction of the polyester, during the polycondensation reaction, or after the completion of the polycondensation reaction. The method of adding in is adopted. Alternatively, a master chip containing the polyoxyethylene-based polyether and the organic sulfonate may be prepared in advance, and this may be mixed with a polyester chip in a drying process or a melt spinning process, or each may be melted. And then mixed.

  By the above method, 0.5 to 20% by weight of water-insoluble polyoxyethylene-based polyether and 0.1 to 3.0% by weight of organic sulfonate salt substantially non-reactive with the polyester are added to the polyester. Preferably 0.2 to 2.0% by weight), for example, in the form of chips, melted and discharged from a spinneret at a spinning temperature of 270 to 310 ° C., cooled and solidified the discharged polymer, and applied an oil agent This is taken up at 500-2500 m / min, preferably 800-1500 m / min, and once wound around a winder as undrawn yarn. Next, the obtained undrawn yarn is used as a raw yarn, heated in contact with a heating roller at 70 to 140 ° C., preferably 80 to 120 ° C. in an untwisted state, and then the heating end point (from the heating roller) 2.2 to 3 through a contact type heater heated to 180 to 250 ° C. and a triaxial friction piece disk type false twisting device with a peripheral speed of 800 to 1200 m / min, with the point at which the yarn leaves) It is obtained by simultaneously drawing false twisting by a factor of 0.0. In that case, the false twisting device is not particularly limited to the above, and may be a belt type or a pin type.

  The single filament fineness of the multifilament crimped yarn a is preferably 1.5 to 4.5 dtex, and the total fineness of the yarn is preferably 55 to 170 dtex.

  Next, another multifilament non-crimped yarn b constituting the mixed yarn of the present invention is substantially non-crimped, and the cross-sectional shape of the single fiber constituting the multifilament has a hollow portion. This is very important. Here, if the multifilament non-crimped yarn b has a crimp, it is not preferable because a difference in yarn foot from the multifilament crimped yarn a is not exhibited and a sufficient cotton-like texture cannot be obtained. In addition, it is important for the cross-sectional shape of the single fiber constituting the multifilament non-crimped yarn b to have a hollow portion in order to obtain a lightweight feeling, and the hollow ratio is preferably in the range of 10 to 50%. . If the hollowness is less than 10%, sufficient resilience and light weight may not be obtained. On the other hand, when the hollow ratio is larger than 50%, the cross section is liable to be crushed and the spinning property becomes difficult, which is not preferable.

  The cross-sectional shape of the single fiber of the multifilament non-crimped yarn b is not particularly limited as long as it has a hollow portion, and is the same cross section as the round hollow, triangular hollow, square hollow, and multifilament crimped yarn a. It may be. Among these, a round hollow is preferable from the viewpoint of the stability of yarn production.

  Further, as the polyester forming the multifilament non-crimped yarn b, polyethylene terephthalate, polybutylene terephthalate, polytrimethylene terephthalate, polyethylene naphthalate and the like are particularly suitable. Such polyester contains optional additives such as an antioxidant, an ultraviolet absorber, a heat stabilizer, a flame retardant, titanium oxide, a colorant, and inert fine particles as long as the object of the present invention is not impaired. Also good. Furthermore, the polyester containing the same polyether and organic sulfonate as the multifilament crimped yarn a may be used. The spinning method may also be a normal spinning method using a spinneret having a normal hollow fiber discharge hole shape.

  The multifilament non-crimped yarn b preferably has a single fiber fineness of 1.5 to 4.5 dtex and a total fineness of the yarn of 55 to 170 dtex.

  The blended weight ratio of the multifilament crimped yarn a and the multifilament non-crimped yarn b is less effective in improving the lightness if the former ratio is too large, while on the other hand, if it is too small, the feeling of dryness and fibrillation is reduced. Therefore, the range of 3: 7 to 7: 3 is preferable.

  In addition, the method for mixing these yarns is not particularly limited. However, the multifilament yarns that have been wound up once are aligned, and a method for performing mixed fiber entanglement processing using a conventionally known mixed fiber entanglement processing device (interlace nozzle). Is preferred.

  When the multifilament crimped yarn a and the multifilament non-crimped yarn b are simply drawn and combined, the multifilament crimped yarn a and the multifilament non-crimped yarn b are easily separated, and cotton Improvement of the texture is also insufficient. The mixed fiber of the present invention may contain other yarns as long as the object of the present invention is not impaired.

  In order to produce a fabric using the mixed yarn of the present invention described above, an appropriate twist may be applied as necessary, and the desired structure may be knitted or knitted. The multifilament crimped yarn a is fibrillated by subjecting the knitted and woven fabric to normal alkali weight reduction processing. As a result, a cotton fabric having not only good resilience and lightness but also dryness and fibrillation can be obtained.

  In that case, the proportion of the mixed yarn of the present invention in the fabric is not necessarily 100%, but it is preferable that the proportion is larger in order to obtain an excellent dry feeling, fibrillation feeling and light weight feeling. Moreover, there is no problem even if a normal dyeing finish is applied.

  EXAMPLES Hereinafter, although an Example is given and this invention is demonstrated in detail, this invention is not limited at all by these. In addition, each physical property in an Example is measured with the following method.

(1) Crimp rate When a casket of 3300 dtex (3000 de) is made using a measuring instrument, a light load of 6 × 9.8 mN (6 gf) and a heavy load of 600 × 9.8 mN (600 gf) are suspended. Read the Lase length L0. Next, the heavy load is removed, and after immersing in warm water of 98 to 100 ° C. for 20 minutes to cause crimping, air drying is performed for 24 hours, and the casket length L1 when the heavy load is suspended is read again. Then, the heavy load is removed, and the lase length L2 after 1 minute is read. The crimp rate is calculated by the following formula. The n number is 5.
Crimp rate (%) = (L1-L2) / L0 × 100

(2) Hollowness A cross-sectional photograph of the multifilament was taken (500 times magnification), and the hollowness was determined by the following formula. The filament count (number of single yarns) was n.
Hollow ratio (%) = ((Area of hollow part) / ((Area of hollow part) + (Area of solid part))) × 100

(3) Intrinsic viscosity Measured with an orthochlorophenol solution at 35 ° C.

(4) Texture (Fibrity, dryness, resilience, lightness)
As for the fibrillation, the appearance is evaluated by five experts, and the average value of the fibrillation is determined to be “very good” when the fibrillation progresses uniformly and the quality is high, and the fibrillation is insufficient and many streaks appear. The product was defined as “bad”, and was further divided into two levels, and was ranked into four levels: “very good”, “good”, “slightly bad”, and “bad”. As for other dry feeling, resilience, and lightness, the sensory evaluation by the expert 5 is performed in the same manner as described above, and the average values are “very good”, “good”, “slightly bad”, “ It was ranked in four stages of “bad”.

[Example 1]
100 parts of dimethyl terephthalate, 60 parts of ethylene glycol, 0.06 part of calcium acetate monohydrate (0.0066 mol% with respect to dimethyl terephthalate), and 0.009 part of cobalt acetate tetrahydrate as a color adjuster ( 0.07 mol% with respect to dimethyl terephthalate) was charged into a transesterification vessel, and the temperature was raised from 140 ° C to 220 ° C over 4 hours in a nitrogen gas atmosphere. Reacted.

  After completion of the transesterification reaction, 0.058 part of trimethyl phosphate (0.080 mol% based on dimethyl terephthalate) as a stabilizer and 0.024 part of dimethylpolysiloxy acid as an antifoaming agent were added to the reaction mixture. Then, after 10 minutes, 0.04 part of antimony trioxide (0.027 mol% with respect to dimethyl terephthalate) was added, and the temperature was raised to 240 ° C. while expelling excess ethylene glycol. did.

  Next, the reaction compound has the following formula:

（但し、ｍ、ｍ’は平均値として６、ｐは平均値として１３０、ｊ、ｊ’は１４〜１６であり、平均値として１５、直鎖部（Ｂ）の分子量（ｎＢ）と枝分れ部（ＡおよびＡ’）の分子量（ｎＡ）との比（ｎＡ／ｎＢ）は０．５である）で表される平均分子量８５５１のポリオキシエチレン系化合物を１．４重量％添加し、引き続いて反応缶内の圧力を１時間かけて７６０ｍｍＨｇから３ｍｍＨｇまで減圧し、１０分後に有機スルホン酸塩として、ドデシルベンゼンスルホン酸を０．５重量％、減圧下に添加した。さらに１ｍｍＨｇまで減圧し、同時に反応混合物の温度を１．５時間かけて２４０℃から２８０℃まで昇温した。さらに１ｍｍＨｇ以下の減圧下で、重合温度２８０℃で２時間重合し、この段階で反応混合物に酸化防止剤として、サイアノックス１７９０（アメリカン・サイアナミッド社製）を０．１部、およびマークＡ０−４１２Ｓ（アデカ・アーガス化学社製）０．３部を減圧下で添加し、その後さらに３０分間重合した。このポリマーを常法によりチップ化した。

(However, m and m ′ are 6 as an average value, p is 130 as an average value, j and j ′ are 14 to 16, 15 as an average value, and the molecular weight (nB) and branching of the straight chain part (B). 1.4% by weight of a polyoxyethylene compound having an average molecular weight of 8551 represented by the ratio (nA / nB) of the part (A and A ′) to the molecular weight (nA) is 0.5) Subsequently, the pressure in the reaction vessel was reduced from 760 mmHg to 3 mmHg over 1 hour, and after 10 minutes, 0.5 wt% of dodecylbenzenesulfonic acid was added under reduced pressure as an organic sulfonate. The pressure was further reduced to 1 mmHg, and at the same time, the temperature of the reaction mixture was raised from 240 ° C. to 280 ° C. over 1.5 hours. Further, polymerization was carried out under a reduced pressure of 1 mmHg or less at a polymerization temperature of 280 ° C. for 2 hours. 0.3 part (manufactured by Adeka Argus Chemical Co., Ltd.) was added under reduced pressure, and then polymerized for another 30 minutes. This polymer was chipped by a conventional method.

  The chip thus obtained was melted and discharged from the spinneret at a melting temperature of 287 ° C., and wound once at a spinning speed of 1500 m / min to obtain an undrawn yarn of 150 dtex / 24 fil. Then, the undrawn yarn is brought into contact with the heating roller in an untwisted state using a drawing simultaneous false twisting device arranged in the order of a heating roller, a contact type heater, a triaxial friction type disk type false twisting device, and a drawing roller. Then, the multifilament crimped yarn a having a crimp rate of 2.5% and 68 dtex / 24 fil was obtained by simultaneously drawing false twisting using the heating end point as a false twist start point. At this time, the heating roller speed is 222 m / min, the contact heater temperature is 220 ° C., the stretching roller speed is 500 m / min, the disk peripheral speed of the false twisting device is 925 m / min, the surface temperature of the heating roller is 90 ° C., and the stretching roller Was not heated.

  On the other hand, melt spinning was carried out at 1350 m / min according to a conventional method using ordinary polyethylene terephthalate having an intrinsic viscosity of 0.66 and using a usual spinning machine for hollow spinning. A multifilament with a hollow ratio of 31% and 80 dtex / 24 fil by stretching at a preheating roller temperature of 90 ° C., without using a heat set heater (non-contact type), with a draw ratio of 2.2 times and a draw speed of 500 m / min. Non-crimped yarn b was obtained.

  The obtained two types of multifilaments were aligned and mixed with a normal interlace nozzle to obtain a polyester mixed yarn.

  The obtained blended yarn was used for light yarn and weft, woven into a taffeta fabric, and subjected to refining, alkali weight loss processing (weight loss rate 15%), dyeing, and heat setting according to a conventional method. The resulting woven fabric is fibrillated. It is “very good” for fibrillation, “very good” for dryness, “very good” for resilience, “very good” for lightness, and is as light as cotton. It had a texture and appearance, and was rich in dryness and excellent in resilience.

[Comparative Example 1]
In Example 1, a polyester mixed yarn was obtained in the same manner as in Example 1 except that both the polyoxyethylene compound and the organic sulfonate were not included as the multifilament crimped yarn a. In the same manner as in No. 1, weaving, refining, alkali weight loss processing, dyeing, and heat setting were performed. The resulting fabric has a fibrillation feeling of "bad", a dry feeling of "poor", a rebound of "very good", and a lightweight feeling of "very good", although it is excellent in lightweight feeling, but with a fibrillation feeling and dry feeling It was insufficient.

  When a fabric is obtained using the cotton-like polyester blended yarn of the present invention, the cotton-like polyester fabric has excellent resilience, lightness, dryness and fibrillation, and has never been seen before. Can be obtained.

Claims (5)

A cotton-like polyester blended yarn comprising a multifilament crimped yarn a and a multifilament non-crimped yarn b satisfying the following:
Multifilament crimped yarn a:
A polyester multifilament crimped yarn made of polyester and imparted with crimp, wherein the polyester is a polyether represented by the following general formula, and the molecular weight of the straight chain portion (B) in the following general formula The ratio (nA / nB) of the molecular weight (nA) of the (nB) to the branched portion (A and A ′) is 0.2 to 1.2, and the average molecular weight of the polyether is 5000 to 16000. A polyester multifilament crimped yarn comprising 0.5 to 20% by weight of an oxyethylene-based polyether and 0.1 to 3.0% by weight of an organic sulfonate salt substantially nonreactive with the polyester.
Multifilament non-crimped yarn b:
A polyester multifilament non-crimped yarn which is not crimped and has a hollow portion in the cross-sectional shape of a single fiber constituting the multifilament.

The cotton-like polyester blended yarn according to claim 1, wherein the crimp rate of the multifilament crimped yarn a is in the range of 2 to 15%. The cotton-like polyester blended yarn according to claim 1 or 2, wherein a hollow ratio is in a range of 10 to 50% in a cross-sectional shape of a single fiber constituting the multifilament non-crimped yarn b. The cotton-like polyester according to any one of claims 1 to 3, wherein the multifilament crimped yarn a and the multifilament non-crimped yarn b are included at a weight ratio (a: b) of 7: 3 to 3: 7. Mixed yarn. The cotton-like polyester blended yarn according to any one of claims 1 to 4, wherein the multifilament crimped yarn a and the multifilament non-crimped yarn b are subjected to blending and entanglement treatment.