JP2014231658A - Bilayer-structured spun yarn exhibiting deodorant performance - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a spun yarn that can effectively exert a deodorant performance.SOLUTION: The bilayer-structured spun yarn exhibits a deodorant performance and has a core-sheath structure. The core part is composed of thermoplastic synthetic fibers. The sheath part contains cellulose fibers into which a carboxyl group is introduced by a graft polymerization in an amount of at least 10 mass% or more to the mass of the whole spun yarn. The proportion of the core part to the sheath part is core:sheath=20:80 to 70:30. The thermoplastic synthetic fiber constituting the core part is preferably a polyester fiber.

Description

  The present invention relates to a two-layer structure spun yarn having deodorant performance.

  In sportswear and innerwear, imparting “deodorizing performance” that eliminates the smell of sweat is an important factor for improving comfort during wearing. Various methods have been proposed as a method for imparting deodorant properties to the fiber, but a method of fixing a metal compound having antibacterial and deodorant properties to the fiber with a binder is common. However, according to this method, the deodorizing ability and its quick effect depend on the amount of the deodorant fixed, and the more deodorant to be fixed, the more the amount of binder is increased and the texture is cured. If the amount of the binder is reduced, there has been a problem that the functional agent falls off due to washing.

  As a method for solving this, a carboxyl group is introduced into the cellulose fiber by graft polymerization, and a metal compound or the like is chemically supported thereon, thereby reducing the texture change while maintaining good antibacterial properties and deodorizing properties. In addition, there is a method for improving the washing durability (Patent Document 1). However, since the cellulose fiber modified by this method has low water absorption and diffusibility, the absorbed sweat stays in a certain place, so even if the modified cellulose fiber is used for the entire fabric, the modified cellulose fiber Can contribute to the deodorizing action only in specific places, and as a result, the deodorizing function cannot be effectively exhibited.

Japanese Patent Laid-Open No. 6-184941

  This invention makes it a technical subject to provide the spun yarn which can exhibit the deodorizing performance effectively.

  The present inventors diligently studied to achieve the above problems. Then, it was considered how quickly the absorbed sweat could be brought into contact with many modified cellulose fibers to exert a deodorizing effect. That is, in the fiber inferior in the diffusibility of the liquid, the absorbed sweat stays in one place, and only the deodorizing fiber present in that place exhibits the deodorizing effect. Therefore, the present inventors pay attention to the structure of the thread, and by using a specific thread structure that can diffuse quickly over a wide area without remaining in one place, the deodorizing function can be exhibited more efficiently. Has been found, and the deodorant quick action can be greatly improved, and the present invention has been achieved.

  That is, the present invention is a two-layer structure spun yarn having a core-sheath structure, wherein the core portion is composed of a thermoplastic synthetic fiber, and the sheath portion is made of at least a cellulose fiber introduced with a carboxyl group by graft polymerization of the entire spun yarn. It has 10% by mass or more based on the mass, and the ratio of the core part to the sheath part of the double-layer structure spun yarn is core: sheath = 20: 80 to 70:30 The layered spun yarn is the gist.

  Next, the present invention will be described in detail.

  The spun yarn of the present invention is a two-layer structured spun yarn having a core-sheath structure, and the core portion is composed of a thermoplastic synthetic fiber. Thermoplastic synthetic fibers are fibers composed of polyamide, polyester, polyolefin, etc. These fibers have a moisture content in the standard state of about 4% for polyamide fibers, about 0.4% for polyester fibers, Zero. That is, such a thermoplastic synthetic fiber is hydrophobic because the fiber itself is difficult to absorb and retain moisture. By forming the core portion with hydrophobic fibers, the fiber bundle (core portion) made up of a large number of hydrophobic fibers arranged in the core portion allows moisture to pass through the gaps between the fibers without retaining moisture. It exhibits the water-conducting function through which water flows and can be diffused without staying in one place. Further, by arranging such hydrophobic fibers in the core portion in a concentrated manner, quick drying properties are improved, and further, there are effects such as improvement of touch due to the hydrophobic fibers not appearing.

  As described above, polyamide fiber, polyolefin fiber, or polyester fiber is used as the thermoplastic synthetic fiber constituting the core. This thermoplastic synthetic fiber also contributes to imparting functions of maintaining the strength and dimensional stability of the spun yarn. In particular, the use of polyethylene terephthalate fiber as the thermoplastic synthetic fiber is particularly preferable from the viewpoint of strength and dimensional stability. Moreover, as a form of the fiber, considering the conjugation force between the core and the sheath, a short fiber having a specific fiber length is preferable to a continuous fiber.

  The modified cellulose fiber used for the sheath part of the present invention is a fiber having a carboxyl group introduced by graft polymerization without using a binder or the like. Since it is modified by graft polymerization, there is no concern of texture hardening or deterioration in washing durability as compared with a method of fixing a deodorant with a binder or the like. The cellulose fiber to be modified is not particularly limited as long as it can be spun, and examples thereof include cotton, lyocell, hemp, rayon, modal, etc., but the strength of raw cotton is reduced by introducing carboxyl groups by graft polymerization. Therefore, cotton and lyocell which are strong and have good spinnability are suitable. The method for introducing carboxyl groups into cellulose fibers can be carried out by the method described in JP-A-6-184941. That is, methacrylic acid may be graft copolymerized with cellulose fibers in an aqueous solution containing hydrogen peroxide and divalent iron salt. In addition, antibacterial and deodorant fibers (trade name: Deu) marketed by Nippon Washi Dyeing Co., Ltd. can be used as modified cellulose fibers into which carboxyl groups have been introduced by graft polymerization.

  The modified cellulose fiber into which the carboxyl group is introduced is disposed in the sheath portion of the double-layer structure spun yarn. This is because the fibers having deodorizing performance are arranged in a concentrated manner on the surface layer of the yarn, so that they can efficiently come into contact with the odor component in the gas phase, so that the deodorizing function can be effectively exhibited.

  The deodorizing performance of the two-layer structure spun yarn of the present invention targets sweat odor, and particularly deodorizing performance with respect to ammonia is regarded as important. This is because among ammonia, acetic acid, and isovaleric acid, which are the main odor components of sweat odor, ammonia is difficult to adsorb on the most unmodified cellulose fiber, and is also highly irritating as odor. . In the present invention, the deodorizing effect can be quickly obtained by neutralizing ammonia with the carboxyl group introduced into the cellulose fiber. From this mechanism, the deodorization rate can be confirmed by the neutralization rate of the ammonia component.

  The modified cellulose fiber introduced with a carboxyl group is contained in an amount of 10% by mass or more based on the total mass of the spun yarn in consideration of the deodorizing performance. Preferably it is 20 mass% or more. Moreover, although the fiber distribute | arranged to a sheath part is good also as only a modified cellulose fiber, you may distribute | arrange together with another fiber. As another fiber, the cellulose fiber which has not performed deodorizing processing can be used preferably. The reason for selecting the cellulose fiber as the other fiber is that the touch is good and the mixing property with the modified cellulose fiber subjected to the deodorizing process is good.

  In the two-layer structure spun yarn of the present invention, the ratio of the core part to the sheath part is core: sheath = 20: 80 to 70:30. Moreover, core: sheath = 30: 70-45: 55 is preferable. When the ratio of the core portion is less than 20% by mass, the thickness of the sheath portion in the cross section of the spun yarn tends to increase, depending on the thickness of the spun yarn, and sweat water absorbed from the surface is absorbed by the core surface from the sheath portion surface. It becomes difficult to reach the part, and the effect of the present invention is hardly exhibited. Further, when the ratio of the core portion is reduced, the strength of the spun yarn tends to be reduced. On the other hand, when the ratio of the core part exceeds 70% by mass, the ratio of the fibers exhibiting the deodorizing function tends to decrease, and the appearance and texture of the fabric tend to be inferior.

  By adopting a specific yarn structure in the two-layer structure spun yarn of the present invention, the present inventors presume the reason why it effectively exhibits a deodorizing function even with sweat absorbed from the yarn surface. To do. Sweat that has absorbed water from the surface of the yarn does not diffuse widely in the fibers that make up the sheath part, that is, it tends to stay in one place as a characteristic of the modified cellulose fiber contained in the sheath part. To reach. Sweat that has reached the core flows through the bundle of hydrophobic thermoplastic fibers in the core and quickly diffuses. Next, the sweat water sufficiently diffused through the core portion does not stay in the core portion but moves to the sheath portion side that contacts the portion by evaporation or the like, and contacts the modified cellulose fiber existing in the sheath portion. At this time, odorous components such as ammonia in sweat neutralize by contacting with the modified cellulose fiber, thereby exhibiting a deodorizing function. In this way, sweat water absorbed in one place is transferred from the sheath part to the core part, and quickly spreads over a wide area due to the water guiding effect of the core part. The deodorizing function of the sheath is exhibited in the process of transitioning to the sheath and transitioning to the surface, preventing odorous components from being emitted on the yarn surface. According to the present invention, it diffuses quickly over a wide range and effectively exhibits the deodorizing function.

  The double-layer structure spun yarn having deodorizing performance of the present invention may be produced by a known method, and can be produced stably by, for example, the method described in Japanese Examined Patent Publication No. 56-11775. That is, a sliver is created using a group of fibers arranged in a core part and a sheath part, and using these slivers, a sheath part sliver is wound around the core sliver in the roving stage to form a two-layer structure. In the manufacturing process, it is necessary to create a sliver with only the fibers to be placed on the sheath. Therefore, in consideration of strength and operability, the sheath is modified with deodorized cellulose fibers and others. It is preferable to improve the strength by using these fibers together.

The two-layer structure spun yarn of the present invention may be applied to fabrics such as woven fabrics and knitted fabrics by the same handling as ordinary spun yarns. When applied to a fabric, a woven or knitted fabric may be formed using only the two-layer structure spun yarn of the present invention. Also, depending on the use of the fabric and the desired performance, it may be woven or knitted together with other yarns. Considering the deodorizing performance, it is preferable that the modified cellulose fiber introduced with a carboxyl group contained in the two-layer structure spun yarn of the present invention is contained in the fabric at 15 g / m ² or more. When other yarns are used in combination, it is preferable to select a yarn composed of cellulose fibers or a two-layer structure spun yarn in which cellulose fibers are arranged in the sheath portion because the touch is good.

  When processing a woven or knitted fabric machine using the double-layer structure spun yarn of the present invention, it is possible to perform the processing using a known method, but the performance of the introduced carboxyl group is maintained and strong. In order to maintain as much as possible, it is preferable that the bleaching step is performed with hydrogen peroxide and is performed under a low temperature condition of less than 80 ° C., and then the pH of the final bath is acidified by acetic acid treatment.

  The double-layer structure spun yarn of the present invention includes a modified cellulose fiber in the sheath part and a thermoplastic fiber in the core part, so that excellent deodorizing performance can be quickly achieved without impairing the gentle touch and soft texture. Can demonstrate. Therefore, since the fabric using the double-layer structure spun yarn of the present invention can quickly exhibit excellent deodorization performance, it can be applied to, for example, clothes such as underwear, sportswear and uniforms, and nursing products such as nursing clothes and nursing sheets. Is preferred.

It is a schematic side view which shows an example of a spinning machine. It is a schematic plan view which shows an example of a spinning machine.

  Hereinafter, the present invention will be specifically described with reference to examples.

Example 1
Using a roving machine having the structure shown in FIG. 1 (schematic side view) and FIG. 2 (schematic plan view), a sliver composed of polyester short fibers 1.7 dtex × 38 mm is supplied as a sliver (S1) disposed in the core. As a wrapping sliver (S2) serving as a sheath, cotton and modified cotton (Nippon Eyelash Co., Ltd. obtained by graft polymerization of methacrylic acid onto cotton to introduce a carboxyl group) cotton: modified cotton = 4: 3 The sliver head (E) is supplied to the sliver (S1) as the core in the draft direction in FIG. 2, and the sliver ratio after the draft is set to S1: S2 = 30: 70. ) Was set to 60 degrees to obtain a roving yarn having a roving weight of 280 gelenes / 30 yards and a twist number of 1.0 T / 吋. The roving was spun by a conventional spinning machine to obtain a double-layered spun yarn of the present invention having 30 counts (English cotton count). The ratio of the modified cellulose fiber to the entire spun yarn was 30% by mass.

Using the spun yarn thus obtained, knitting with a smooth structure in a circular knitting machine having a hook diameter of 33 inches and a 22 gauge, bleaching under low temperature conditions using hydrogen peroxide, and 170 ° C. after acetic acid treatment A finishing set for 30 seconds was performed to obtain a knitted fabric using the double-layer structure spun yarn having a deodorizing property of the present invention having a width of 150 cm and a basis weight of 350 g / m. The obtained knitted fabric had a soft feel of cotton and a good tactile sensation, and the content of the modified cellulose fiber in the knitted fabric was 70 g / m ² .

Example 2
As sliver (S2), solvent-spun cellulose fiber (lyocell) 1.3 dtex × 38 mm and modified lyocell (Nippon Eyelash Co., Ltd. obtained by grafting methacrylic acid to lyocell and introducing a carboxyl group) were prepared. , Lyocell: modified lyocell = 30: 30, using a mixed card sliver, and the ratio of each sliver after draft was S1: S2 = 40: 60. Thus, a two-layer structure spun yarn having the deodorizing performance of the present invention of No. 30 was obtained. The ratio of the modified cellulose fiber to the entire spun yarn was 30% by mass.

Using the spun yarn thus obtained, a knitted fabric using a double-layer spun yarn having a deodorizing performance of the present invention having a width of 152 cm and a basis weight of 360 g / m was obtained as a smooth knitted fabric in the same manner as in Example 1. The obtained knitted fabric was soft and soft to the touch, and the content of the modified cellulose fiber in the knitted fabric was 71 g / m ² .

Example 3
As wrapping sliver (S2) to be the sheath, comb sliver consisting only of modified cotton (in which carboxylic acid is grafted onto cotton and introduced with a carboxyl group by Nippon Ishige Co., Ltd.), each sliver after drafting In the same manner as in Example 1 except that the ratio of S1: S2 = 70: 30 was obtained, a double-layered spun yarn having a count of 30 (English cotton count) was obtained. The ratio of the modified cellulose fiber to the entire spun yarn was 30% by mass.

Using the obtained spun yarn, a smooth knitted fabric is knitted in the same manner as in Example 1, bleached, finished, and knitted using a double layer spun yarn having a width of 150 cm and a basis weight of 350 g / m. Got. Since the obtained knitted fabric had all the modified cellulose fibers arranged on the yarn surface, it was slightly inferior to the soft feeling as compared with Example 1. The content of the modified cellulose fiber in the obtained knitted fabric was 70 g / m ² .

Example 4
The double-layered spun yarn having the deodorant property obtained in Example 1 and the double-layered structure in which the polyester fiber is 1.7 dtex × 38 mm in the core part and cotton is arranged in the sheath part at a core-sheath ratio of 30:70. Using a spun yarn of No. 30, a smooth knitted fabric was knitted under the conditions described in Example 1 with an array of (two-layer structure spun yarn having deodorizing property) :( two-layer structure spun yarn) = 1: 2. A knitted fabric using a double-layered spun yarn having a deodorizing performance of the present invention having a width of 150 cm and a basis weight of 350 g / m was obtained by performing standing, bleaching, and finishing setting. The obtained knitted fabric had a soft feel of cotton and a good tactile sensation, and the content of the modified cellulose fiber in the knitted fabric was 23 g / m ² .

Comparative Example 1
Using a conventional roving machine, three raw cottons of polyester short fiber 1.7 detex × 38 mm, cotton, and modified cotton (introduced with carboxyl group introduced by graft polymerization of methacrylic acid on cotton at Nippon Kashiwa Co., Ltd.) A sliver mixed in a ratio of polyester: cotton: modified cotton = 30: 40: 30 was supplied to obtain a roving yarn with a roving weight of 280 gelen / 30 yards and a twist number of 1.0 T / １．０. This roving was spun with a conventional spinning machine to obtain 30th (English cotton count) blended yarn.

Using the obtained spun yarn, a smooth knitted fabric was knitted in the same manner as in Example 1, subjected to bleaching, and finished to obtain a fabric using a blended yarn having a width of 150 cm and a basis weight of 350 g / m. . The obtained knitted fabric was composed of mixed spun yarn, and had yarn unevenness and inferior softness as compared with Example 1. The content of the modified cellulose fiber in the obtained knitted fabric was 70 g / m ² .

Comparative Example 2
The ratio of cotton: modified cotton = 55: 30 is cotton and modified cotton (made by grafting methacrylic acid onto cotton and introducing a carboxyl group by Nippon Ishige Co., Ltd.) as a wound sliver (S2) to be a sheath Comb sliver mixed so as to become a double layer of 30th (English cotton count) in the same manner as in Example 1 except that the ratio of each sliver after draft was S1: S2 = 15: 85 A structured spun yarn was obtained.

Using the obtained spun yarn, a smooth knitted fabric is knitted, bleached, and finished in the same manner as in Example 1, and a fabric using a double layer spun yarn having a width of 150 cm and a basis weight of 350 g / m is used. Got. The content of the modified cellulose fiber in the obtained knitted fabric was 70 g / m ² .

Comparative Example 3
Cotton and modified cotton (made by grafting methacrylic acid to cotton and introducing carboxyl groups into cotton by Nippon Kayaku Co., Ltd.) as a winding sliver (S2) to be a sheath part: ratio of cotton: modified cotton = 65: 5 A double-layered spun yarn having a count of 30 (English cotton count) was obtained in the same manner as in Example 1 except that the comb sliver was mixed so that The ratio of the modified cellulose fiber in the entire spun yarn was 5% by mass.

Using the obtained spun yarn, a smooth knitted fabric is knitted, bleached, and finished in the same manner as in Example 1, and a fabric using a double layer spun yarn having a width of 150 cm and a basis weight of 350 g / m is used. Got. The content of the modified cellulose fiber in the obtained knitted fabric was 15 g / m ² .

Reference Example The double-layer structure spun yarn having the deodorizing performance of the present invention obtained in Example 1 and the core portion with polyester short fibers of 1.7 dtex × 38 mm and the sheath portion with cotton at a core-sheath ratio of 30:70 The arranged double-layered spun yarn was knitted into a smooth knitted fabric under the conditions described in Example 1 with a deodorant double-layered spun yarn: double-layered spun yarn = 1: 5 array, and subjected to bleaching. Then, a finishing set was performed to obtain a fabric using a double-layered spun yarn having a width of 150 cm and a basis weight of 350 g / m.
At this time, the content of the modified cellulose fiber in the dough was 11 g / m ² .

The physical properties of the knitted fabrics of Examples 1 to 4, Comparative Examples 1 to 3, and Reference Example were evaluated, and the results are shown in Table 1. The physical properties were measured by the following methods.
(1) Water-absorbing diffusibility A fabric to be a sample is placed on a horizontal surface, and the wet area when 0.1 ml of water is dropped from a height of 0.5 cm is 30 seconds after dropping, 60 seconds after and 5 minutes after dropping. It measured later and the result was shown by the diffusion area (mm < ² >) in each elapsed time.
(2) Deodorization performance Measurement was performed using ammonia as an odor component for the sample fabric according to the deodorization performance evaluation method in the SEK deodorization processing mark certification specified by the Fiber Evaluation Technology Council. The odor reduction rate (unit:%).
(3) Neutralization speed (deodorization speed)
Place the sample fabric on a horizontal surface, and add 0.1 ml of a color solution containing a small amount of Bromothymol Blue color indicator to an aqueous ammonia solution adjusted to PH9 from a height of 0.5 cm. , Measure the time from when the colored solution was dropped until all the colored solution changed color from blue (PH 7.6 or higher) to yellow (PH 6.0 or so), and the result was expressed in neutralization time (seconds) It was. The neutralization time was 10 seconds or less, and the deodorization rate was fast and good.

  As is apparent from Table 1, the knitted fabrics using the spun yarns of Examples 1 to 4 are excellent in deodorizing property and water absorption diffusibility, and the deodorizing rate indicated by the neutralization rate is also good.

  On the other hand, in Comparative Example 1, the spinning method is blended, the water-absorbing diffusibility is lower than that of the two-layer structure spun yarn, and the deodorization rate indicated by the neutralization rate is slower than the example and exceeds 10 seconds. there were.

  The knitted fabric of Comparative Example 2 had low water absorption diffusivity due to the low core ratio, and the deodorization rate indicated by the neutralization rate was slower than that of the example and exceeded 10 seconds. In addition, the core part sliver was frequently cut in the manufacturing process, and there was a problem in operability. In addition, since the ratio of the polyester fiber in the core is low, there is a concern that the dimensional change rate and the quick drying property are inferior.

In Comparative Example 3, the mixing ratio of the modified cellulose fiber in the spun yarn was small and the deodorizing performance was inferior.

Claims (5)

A double-layer spun yarn having a core-sheath structure, wherein the core part is composed of thermoplastic synthetic fibers, and the sheath part is composed of cellulose fibers introduced with carboxyl groups by graft polymerization at least 10 masses relative to the total mass of the spun yarn. %, And the ratio of the core part to the sheath part of the double-layer structure spun yarn is core: sheath = 20: 80 to 70:30. The double-layer structure spun yarn having deodorizing performance according to claim 1, wherein the thermoplastic synthetic fiber constituting the core portion is a polyester fiber. The double-layer structure spun yarn having deodorizing performance according to claim 1 or 2, wherein the sheath part is formed by mixing cellulose fibers introduced with carboxyl groups and cellulose fibers not introduced with carboxyl groups. A fabric comprising the double-layer structure spun yarn having deodorant performance according to any one of claims 1 to 3. The fabric according to claim 4, wherein the fabric contains 15 g / m ² or more of cellulose fibers into which carboxyl groups are introduced.