Polyester fiber and woven / knitted fabrics using the same

Abstract

To provide antiviral polyester fibers having excellent washing durability and polyester woven and knitted fabrics including the same.SOLUTION: Woven and knitted fabrics include polyester fibers. The polyester fibers are coated with quaternary ammonium halide and a polyester absorbent.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a polyester fiber having excellent washing durability and antiviral properties, and a polyester woven or knitted fabric using the same. [Background technology]

[0002] In recent years, interest in environmental hygiene has increased, and there is a growing demand for materials for clothing that have antiviral properties and other features.

[0003] Fiber fabrics that have been imparted with antibacterial, antiviral, and antiallergenic properties have been proposed (Patent Document 1), but they have had issues such as a stiff texture and poor water absorbency due to the use of a binder. While various agents such as metal ions and cationic surfactants have been proposed as antiviral agents, a product containing a quaternary ammonium halide has been proposed as an antiviral product with excellent washing durability (Patent Document 2). However, there is a demand for a product with even better washing durability. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2011-246859 [Patent Document 2] International Publication No. 2016 / 009928 Summary of the Invention [Problem to be solved by the invention]

[0005] An object of the present invention is to provide a polyester fiber having excellent washing durability and antiviral properties, and a polyester woven or knitted fabric using the same. [Means for solving the problem]

[0006] The present inventors have conducted extensive research to achieve the above object, and as a result, have found that the use of a polyester-based water-absorbing agent in a woven or knitted fabric using polyester fibers dramatically improves the washing durability of the antiviral performance when a quaternary ammonium halide is used. That is, the present invention has the following configuration. The woven or knitted fabric contains polyester-based fibers, and a quaternary ammonium halide and a polyester-based water-absorbing agent are attached to the polyester-based fibers. As a woven or knitted fabric, a preferred embodiment is one in which the antiviral activity value according to JIS L 1922:2016 is 3 or more after 50 washes according to the standard washing method (40°C) that conforms to the washing method for SEK-marked textile products. Furthermore, as a woven or knitted fabric, it is preferable that the water absorbency is within 3 seconds when evaluated by the dropping method of JIS L 1907 (2010 method) after 50 washes using the standard washing method (40°C) in accordance with the washing method for SEK mark textile products. The woven or knitted fabric preferably contains polyester fibers in an amount of 50% by mass or more, and more preferably 80% by mass or more. The present invention also relates to polyester fibers to which a quaternary ammonium halide and a polyester water-absorbing agent are attached. [Effects of the Invention]

[0007] According to the present invention, the polyester-based water-absorbing agent is absorbed into the polyester fiber, and the antiviral agent is also absorbed into the polyester-based water-absorbing agent, thereby significantly suppressing the fall-off of the antiviral agent after washing, and making it possible to provide an antiviral woven or knitted fabric and polyester-based fiber with dramatically improved washing durability. DETAILED DESCRIPTION OF THE INVENTION

[0008] The present invention will be described in detail below. The woven or knitted fabric of the present invention contains polyester-based fibers, which provide excellent adhesion of quaternary ammonium halides. From the viewpoint of excellent adhesion, the polyester-based fibers preferably account for 50% by mass or more, and more preferably 80% by mass or more, of the woven or knitted fabric. Examples of polyester-based fibers include, but are not limited to, aromatic polyester fibers such as polyethylene terephthalate, polytrimethylene terephthalate, and polybutylene terephthalate, and aliphatic polyester fibers such as polylactic acid and polyglycolic acid. Among these, fibers made of polyethylene terephthalate, polytrimethylene terephthalate, and polybutylene terephthalate are preferred because they have excellent mechanical properties and durability, and also have good color fastness due to their material properties. As fibers other than polyester-based fibers, synthetic fibers such as polyamide, polyacrylic, polyurethane, etc., and blended yarns of synthetic fibers with natural fibers such as cotton, rayon, wool, silk, etc. As for the form of woven or knitted fabrics, polyester-based fibers can be used alone, or the above-mentioned fibers can be used in combination with each other to form interwoven or interknitted fabrics. It is important that the woven or knitted fabric of the present invention has a quaternary ammonium halide attached thereto. Quaternary ammonium halide has the ability to strongly adsorb and denature the amino acids in the proteins that constitute viruses, thereby exerting a high antiviral effect. Quaternary ammonium halides include tetramethylammonium iodide, trimethyldecylammonium bromide, didecyldimethylammonium bromide, dimethyldidodecylammonium bromide, dodecyldimethyl-2-phenoxyethylammonium bromide, lauryltrimethylammonium bromide, cetyltrimethylammonium bromide, didecyldimethylammonium chloride, trimethylammonium chloride, trimethyldodecylammonium chloride, trimethyltetradecylammonium chloride, cetylpyridinium chloride, and trimethylhexadecylammonium chloride. Examples of the ammonium chloride include octadecyl ammonium chloride, trimethyloctadecyl ammonium chloride, didecyl monomethyl hydroxyethyl ammonium bromide, alkyl dimethyl hydroxyethyl ammonium chloride, alkyl trimethyl ammonium bromide, dioctyl dimethyl ammonium chloride, dioctyl dimethyl ammonium bromide, octyl decyl dimethyl ammonium chloride, octyl decyl dimethyl ammonium bromide, methyl benzethonium chloride, alkyl dimethyl benzyl ammonium chloride, alkyl pyridinium ammonium chloride, dialkyl methyl benzyl ammonium chloride, etc. Among these, didecyl dimethyl ammonium chloride is particularly preferably used because of its high affinity with polyester-based water-absorbing agents. The amount of quaternary ammonium halide attached is preferably 0.01 to 10 parts by weight per 100 parts by weight of the woven or knitted fabric. If it is less than 0.01 part by weight, sufficient antiviral properties may not be obtained, and if it is more than 10 parts by weight, there is a concern that fastness may decrease. In the present invention, in addition to the quaternary ammonium halide, a polyester-based water-absorbing agent is attached to the woven or knitted fabric. This dramatically improves the durability of the antiviral properties provided by the quaternary ammonium halide. The concentration of the quaternary ammonium halide used is preferably 0.1 to 100 g / L. Because anionic additives can inhibit the antiviral properties of quaternary ammonium halides, nonionic polyester water absorbents are preferred. Nonionic water absorbents typically marketed as water absorbents for polyester fibers are preferred, with polyoxyethylene polyester resins being particularly preferred due to their high affinity with quaternary ammonium halides. Commercially available products include SR6200, Acriner N A99, and SR-N7015 (manufactured by Takamatsu Oil & Fat Co., Ltd.), "Nicepol" PR-86E (manufactured by Nicca Chemical Co., Ltd.), Meika Finish SRM-65 (manufactured by Meisei Chemical Industry Co., Ltd.), and Chlamical RX-10 (manufactured by Keihin Chemical Industry Co., Ltd.), which can achieve high antiviral activity. Various additives such as water absorbents other than polyester-based ones, water repellents, hard finishing agents, and stain-proofing agents can be blended, but it is preferable to select nonionic additives for these as well, as with polyester-based water absorbents. Methods for attaching the quaternary ammonium halide to the woven or knitted fabric of the present invention include bath treatment, dry heat treatment, and wet heat treatment. A preferred bath treatment method involves placing woven or knitted fabrics in a treatment solution containing a quaternary ammonium halide and circulating the treatment solution. Equipment for bath treatment that can be used includes jet dyeing machines, air jet dyeing machines, Jigger dyeing machines, winch dyeing machines, and beam dyeing machines. The bath treatment temperature is preferably 80 to 140°C, more preferably 110 to 140°C. The treatment time is preferably 10 to 120 minutes, more preferably 20 to 60 minutes.

[0009] Dry heat treatment can be achieved by applying a treatment solution containing a quaternary ammonium halide to a woven or knitted fabric using a device such as a mangle, followed by drying and heat treatment. A device capable of uniformly applying the treatment solution to the woven or knitted fabric is preferred, and a typical mangle is a suitable device for applying the treatment solution. Treatment can also be achieved using a foam processing machine, printing, inkjet printing, spraying, coating, or other methods.

[0010] As the drying and heat treatment device, a tenter, a short loop, a shrink surfer, a cylinder dryer, or the like, which can uniformly apply heat to the woven or knitted fabric, can be used.

[0011] The drying temperature is preferably 80 to 150°C. The treatment time is preferably 15 seconds to 5 minutes, more preferably 100 to 140°C and 30 seconds to 3 minutes. The heat treatment temperature after drying is preferably 80 to 200°C. The treatment time is preferably 15 seconds to 8 minutes, more preferably 130 to 190°C and 30 seconds to 5 minutes. If the treatment temperature is too low, the reaction may be insufficient, and satisfactory washing durability may not be achieved. If the treatment temperature is too high, the quaternary ammonium halide may decompose. Furthermore, if a treatment solution is applied during dry heat treatment, the quaternary ammonium halide may extract the dye, reducing the rubbing fastness. Therefore, it is preferable to perform a washing process in water at 30 to 80°C for 30 seconds to 5 minutes.

[0012] Examples of moist heat treatment include a method in which a treatment solution containing a quaternary ammonium halide is applied to a woven or knitted fabric using a device such as a mangle, followed by moist heat treatment. The moist heat treatment device may be any device capable of uniformly applying heat to the woven or knitted fabric, such as an atmospheric pressure steamer or a high-pressure steamer. In a preferred embodiment, the moist heat treatment temperature is 80 to 140°C. The treatment time is preferably 15 seconds to 10 minutes. If the treatment temperature or treatment time for applying the quaternary ammonium halide is insufficient, the quaternary ammonium halide may not be sufficiently fixed to the woven or knitted fabric, potentially resulting in poor antiviral properties. Furthermore, if the treatment temperature or treatment time is too long, the texture of the woven or knitted fabric may become hard and the fastness may decrease.

[0013] A method for attaching a polyester-based water-absorbing agent will now be described. A preferred method for attaching a polyester-based water-absorbing agent is an exhaustion method using a bath treatment. Specifically, a preferred method is to place a woven or knitted fabric in a treatment solution containing a polyester-based water-absorbing agent and circulate the treatment solution. Equipment for the bath treatment can include a jet dyeing machine, air jet dyeing machine, Jigger dyeing machine, winch dyeing machine, and beam dyeing machine. The bath treatment temperature is preferably 80 to 140°C, more preferably 110 to 140°C. The treatment time is preferably 10 to 120 minutes, more preferably 20 to 60 minutes.

[0014] The dyeing process of woven and knitted fabrics will now be described. The dyeing process can be carried out in accordance with the dyeing process and conditions for general polyester blended woven and knitted fabrics, and can be carried out using known methods such as a batch dyeing machine, such as a jet dyeing machine, air jet dyeing machine, Jigger dyeing machine, winch dyeing machine, or beam dyeing machine, as well as continuous dyeing by the pad method, and textile printing using a flat screen, rotary screen, or inkjet printing.

[0015] The quaternary ammonium halide and polyester-based water absorbing agent of the present invention adhere to the fibers, but it is preferable to treat the polyester-based water absorbing agent, which has a high affinity with polyester fibers, in a bath before applying the quaternary ammonium halide. The polyester-based water absorbing agent is absorbed into the polyester fibers, and then the quaternary ammonium halide is applied, so that the quaternary ammonium halide is absorbed into the polyester fibers and also into the polyester-based water absorbing agent. The polyester-based water-absorbing agent attached provides excellent water absorption, and it is particularly preferable that the water absorption time be within 3 seconds after 50 washes when evaluated using the dropping method of JIS L 1907 (2010). Because polyester-based fibers are hydrophobic, without the addition of a water-absorbing agent, they have poor water absorption both initially and after 50 washes, and the antiviral durability to washing is also insufficient. However, by adding a water-absorbing agent and a quaternary ammonium halide, it is possible to achieve high water absorption and antiviral performance. Here, the measurement method for 50 washes is the standard washing method (40°C) in accordance with the washing method for SEK-marked textile products. The antiviral performance is preferably such that the antiviral activity value after 50 washes is 3 or higher according to JIS L 1922:2016. The antiviral activity value after 50 washes is measured using the standard washing method (40°C) in accordance with the washing method for SEK-marked textile products. The polyester-based water-absorbing agent is absorbed into the polyester fiber, and then the quaternary ammonium halide is also absorbed into the polyester-based water-absorbing agent, significantly reducing shedding after washing and providing excellent washing durability. Without the polyester-based water-absorbing agent, the quaternary ammonium halide is partially absorbed into the polyester fiber and partially attached to the fiber surface, but the attached quaternary ammonium halide falls off after washing, preventing excellent antiviral performance. The woven or knitted fabric of the present invention is preferably used for clothing such as sportswear, loungewear, coats, blousons, blouses, shirts, skirts, slacks, indoor sportswear, pajamas, sleepwear, underwear, office wear, work clothes, food service wear, nursing wear, patient wear, care wear, school uniforms, and kitchen wear. It is also preferably used for miscellaneous goods such as aprons, towels, gloves, scarves, socks, hats, shoes, sandals, and bags. It is also preferably used for interior goods such as curtains, kotatsu covers, sofa covers, cushion covers, sofa coverings, and tablecloths. It is also preferably used for bedding such as futon coverings, sheets, futon covers, and pillowcases. [Example]

[0016] Next, the antiviral woven or knitted fabric of the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples. (1) Antiviral activity value The test was conducted in accordance with JIS L 1922:2016. The measurement method was a plaque assay. The test virus used was Influenza A virus: A / Hong Kong / 8 / 68 (H3N2) ATCC VR-1679. The antiviral treatment standard established by the Japan Textile Evaluation Technology Council (JETRO) was evaluated to determine whether the fabric met the antiviral treatment standard of 3 or higher, using fabrics without washing (initial) and fabrics after 50 washes. The washing method was in accordance with the washing method for SEK-marked textile products, with standard washing (40°C) and high-temperature accelerated washing (80°C) performed a specified number of times, and the antiviral activity was measured for each. (2) Water absorption (dropping method) Evaluation was carried out in accordance with JIS L 1907 (2010). The washing method was in accordance with the washing method for SEK-marked textile products, with standard washing (40°C) and high-temperature accelerated washing (80°C) carried out a specified number of times each, and the water absorbency was measured for each. (3) Washing fastness Evaluation was carried out in accordance with JIS L 0844 (A-2) (2011). (4) Rubbing resistance Evaluation was carried out in accordance with JIS L 0849 (JSPS-type method) (2013). (5) Lightfastness Evaluation was carried out in accordance with JIS L 0842 (2004). [Example 1] A twill fabric with a warp density of 86 threads / 2.54 cm and a weft density of 59 threads / 2.54 cm was woven using polyethylene terephthalate (PET) false twist textured yarn (167 dtex, 48 filaments) for the warp and weft yarns that form the ground weave of the fabric.

[0017] The dyeing process involved a standard method of scouring at 95°C, drying at 130°C, and intermediate setting at 180°C. Next, a commercially available navy blue dye and a nonionic polyester water absorbent ("SR-N7015" manufactured by Takamatsu Oil & Fat Co., Ltd.) were added at 1% owf, and the fabric was dyed at 130°C for 45 minutes, reduced and washed at 80°C, rinsed with hot and cold water, dried, and heat-set at 150°C.

[0018] The fabric was then immersed in a 4 g / L aqueous solution of didecyldimethylammonium chloride, wrung at 80% pick-up, and dried in a pin tenter set at 130°C. Heat setting was then carried out for 1 minute at 185°C. The polyester fabric was then washed with water at 60°C for 1 minute and heat set for 1 minute in a pin tenter set at 170°C, yielding a fabric with a density of 107 x 67 threads / 2.54 cm. The resulting woven fabric was excellent in fastness, water absorbency, and antiviral activity, and also had good washing durability. The results are shown in Table 1. [Example 2] A matte fabric was woven using PET false twist textured yarn (84 dtex, 36 filaments) as the warp yarn and PET / cotton spun yarn (16 count, 65% polyester / 35% cotton by mass) as the weft yarn, with a warp density of 151 threads / 2.54 cm and a weft density of 42 threads / 2.54 cm.

[0019] The dyeing process was carried out with intermediate setting in the same process as in Example 1. Next, a nonionic polyester water absorbent ("SR-N7015" manufactured by Takamatsu Oil & Fat Co., Ltd.) was added at 1% owf together with the commercially available navy blue dye, and the PET false twist textured yarn was dyed at 130°C for 45 minutes, reduction washed at 80°C, and rinsed with hot and cold water. Next, cotton was dyed with the commercially available navy blue dye at 100°C for 30 minutes, rinsed with water, dried, and heat set at 150°C. The fabric was then immersed in a 5 g / L aqueous solution of didecyldimethylammonium chloride, squeezed at 60% pick-up, and dried in a pin tenter set at 130°C. Heat setting was then carried out for 1 minute at 185°C. The polyester fabric was then washed with water at 60°C for 1 minute and heat set for 1 minute in a pin tenter set at 170°C, yielding a fabric with a density of 160 x 48 threads / 2.54 cm. The resulting woven fabric was excellent in fastness, water absorbency, and antiviral activity, and also had good washing durability. The results are shown in Table 1. [Example 3] A smooth knit fabric was obtained on a 28-gauge double circular knitting machine using PET false-twist textured yarns of 84 dTec 72 filaments and 84 dTec 48 filaments. The dyeing process involved relaxing and scouring the yarn in the usual way, then adding a commercially available fluorescent dye and a nonionic polyester water absorbent ("SR-N7015" manufactured by Takamatsu Yushi Co., Ltd.) at 1% owf, dyeing the PET false twist textured yarn at 120°C for 30 minutes, rinsing with hot water, drying, and heat setting at 150°C. The knitted polyester fabric was then immersed in a 3 g / L aqueous solution of didecyldimethylammonium chloride, squeezed at 90% pick-up, and dried in a pin tenter set at 130°C. Heat setting was then performed for 1 minute at 185°C. The knitted polyester fabric was then washed with water at 60°C for 1 minute and heat set for 1 minute in a pin tenter set at 170°C to obtain a knitted fabric. The knitted fabric obtained was excellent in fastness, water absorbency, and antiviral activity, and also had good washing durability. The results are shown in Table 1. [Example 4] Using a 28-gauge double circular knitting machine, PET false twist textured yarns of 84 dTec 72 filaments and 84 dTec 48 filaments were knitted in a smooth weave. The dyeing process was carried out according to the usual dyeing and processing method for polyester circular knit fabrics, up to relaxed scouring. Next, a nonionic polyester water absorbent ("SR-N7015" manufactured by Takamatsu Oil & Fat Co., Ltd.) was added at 1% owf together with the commercially available fluorescent dye, and the polyester was dyed at 120°C for 30 minutes, rinsed with hot water, and then The knitted polyester fabric was then immersed in a 3 g / L aqueous solution of dimethyldidodecylammonium bromide, squeezed at 90% pick-up, and dried in a pin tenter set at 130°C. Heat setting was then performed for 1 minute at 185°C. The knitted polyester fabric was then washed with water at 60°C for 1 minute and heat set for 1 minute in a pin tenter set at 170°C to obtain a knitted fabric. The obtained knitted fabric was excellent in fastness, water absorbency, and antiviral activity, and also had good washing durability. The results are shown in Table 1. [Comparative Example 1] The same treatment as in Example 1 was carried out, except that the nonionic polyester-based water-absorbing agent was not added. The obtained woven fabric had insufficient water absorbency and antiviral activity. The results are shown in Table 1. Comparative Example 2 The same treatment as in Example 2 was carried out, except that the nonionic polyester-based water-absorbing agent was not added. The obtained woven fabric had insufficient water absorbency and antiviral activity. The results are shown in Table 1. Comparative Example 3 The same treatment as in Example 3 was carried out except that the nonionic polyester water-absorbing agent was not added. The obtained knitted fabric had insufficient water absorbency and antiviral activity. The results are shown in Table 1. Comparative Example 4 The same treatment as in Comparative Example 3 was carried out, except that the concentration of didecyldimethylammonium chloride was changed to 1 g / L aqueous solution. The obtained knitted fabric had insufficient water absorbency and antiviral activity. The results are shown in Table 1.

[0020] [Table 1]

Claims

1. A woven or knitted fabric containing polyester-based fibers, to which a nonionic polyester-based water-absorbing agent and a quaternary ammonium halide are adhered, the woven or knitted fabric having an antiviral activity value of 3 or more in accordance with JIS L 1922:2016 after 50 washes by a standard washing method (40°C), and a water absorbency of 3 seconds or less in evaluation by the dropping method of JIS L 1907 (2010 method) after 50 washes by a standard washing method (40°C).

2. 2. The woven or knitted fabric according to claim 1, wherein the polyester fiber is contained in the woven or knitted fabric in an amount of 50% by mass or more.

3. 3. The woven or knitted fabric according to claim 1, wherein the polyester fiber is contained in the woven or knitted fabric in an amount of 80% by mass or more.

4. A woven or knitted fabric according to any one of claims 1 to 3, wherein the nonionic polyester-based water absorbent is a polyoxyethylene polyester resin.

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