Cation-dyeable polyester fiber structure, production method of the same, and uniform for medical use

Abstract

To provide a cation-dyeable polyester fiber structure, a production method of the same, and a uniform for medical use.SOLUTION: A cation-dyeable polyester fiber structure includes a cationic dye, a quinoline compound, and an ultraviolet absorber, where 0.03 mass% or more and 0.80 mass% or less of the quinoline compound is included to a mass of the cation-dyeable polyester fiber structure, a color difference ΔE between before and after irradiating the cation-dyeable polyester fiber structure with ultraviolet carbon arc lamplight is 2.0 or lower, and an antibacterial activity value A50 after 50 times of high temperature acceleration washing is larger than a standard cloth growth value F in an antibacterial evaluation method described in an SEK mark textile product certification standard.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a cationic dyeable polyester fiber structure having excellent lightfastness and antibacterial properties after washing, a method for producing the same, and a medical uniform. [Background technology]

[0002] Hospital textiles, such as white coats worn by medical staff in hospitals, clinics, and other medical facilities, are often subjected to repeated industrial washing in hot water at around 60 to 100 degrees Celsius for hygiene reasons, so they must be antibacterial and able to withstand high-temperature washing. Medical staff may also wash their hospital textiles at home and dry them in the sun. When hospital textiles are dried in the sun, the color of the textiles may change due to the effects of ultraviolet rays from sunlight, so hospital textiles must also be lightfast.

[0003] Furthermore, in recent years, hospital textile products have become increasingly colorful, and colorability is also required in addition to antibacterial and lightfast properties. Polyester fibers are widely used in hospital textile products because they have superior durability to high-temperature washing compared to cotton and other fibers. However, polyester fibers dyed with disperse dyes, which are commonly used to dye polyester, have low colorability, i.e., are unclear, posing a challenge when it comes to coloring hospital textile products. On the other hand, polyester fibers dyed with cationic dyes have better colorability than polyester fiber products dyed with disperse dyes, and are therefore increasingly being used in hospital textile products, which require high colorability.

[0004] As a method for imparting antibacterial properties to a textile structure, for example, Patent Document 1 proposes imparting antibacterial properties to the textile structure by heat-treating the textile structure with 2-pyridylthiol-1-oxide zinc (hereinafter referred to as zinc pyrithione), a type of pyridine antibacterial agent, at a specific temperature under normal or increased pressure. It is described that this method results in a textile structure with antibacterial properties that are excellent in durability to industrial washing at a temperature of 85°C.

[0005] Furthermore, Patent Document 2 proposes heat treating oxolinic acid under pressure in a treatment bath at a specific temperature, and describes that this can impart antibacterial properties. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2000-8275 [Patent Document 2] JP 2021-42498 A Summary of the Invention [Problem to be solved by the invention]

[0007] The method described in Patent Document 1 has high antibacterial properties and washing durability, but has the problem that the antibacterial agent containing zinc ions is used, making it difficult to treat the wastewater generated after application of the antibacterial agent. Another problem is that zinc pyrithione can affect dyeability.

[0008] The method disclosed in Patent Document 2 uses oxolinic acid, an organic carboxylic acid compound, and therefore does not have the wastewater treatment problem of Patent Document 1. However, the inventors have found through their studies that, depending on the conditions, lightfastness and antibacterial properties after washing may not be compatible.

[0009] The present invention has been made to solve the above-mentioned problems, and has an object to provide a cationic dyeable polyester fiber structure that has excellent lightfastness and antibacterial properties after washing when using a cationic dyeable polyester fiber and a cationic dye without using an antibacterial agent containing zinc ions or the like. [Means for solving the problem]

[0010] As a result of extensive research, the inventors discovered that, as mentioned above, it is difficult to achieve both lightfastness and antibacterial properties after washing, particularly in systems using cationic dyeable polyester fibers and cationic dyes in combination with dyes and antibacterial agents. For example, they found that increasing the amount of antibacterial agent attached to impart antibacterial properties significantly reduces lightfastness and makes the fabric susceptible to fading by UV irradiation. Further research led them to discover that by attaching a specific amount of a quinoline-based compound to a fiber substrate and using a UV absorber, they can obtain a cationic dyeable polyester fiber structure that exhibits excellent lightfastness and antibacterial properties after 50 high-temperature accelerated washes. They also discovered that, to achieve all of the above performance requirements, it is important to add the cationic dye, quinoline-based compound, and UV absorber to the same bath and then chemically treat the fiber substrate.

[0011] That is, the present invention has the following configuration to solve the above problems. (1) A cationic dyeable polyester fiber structure containing a cationic dye, a quinoline-based compound, and an ultraviolet absorber, The quinoline-based compound is contained in an amount of 0.03% by mass or more and 0.80% by mass or less relative to the mass of the cationic dyeable polyester fiber structure, the color difference ΔE before and after irradiation of the cationic dyeable polyester fiber structure with ultraviolet carbon arc lamp light is 2.0 or less, In addition, the antibacterial activity value after 50 high-temperature accelerated washes is A according to the antibacterial evaluation method described in the SEK Mark textile product certification standards. 50 is greater than the standard fabric growth value F, Cationic dyeable polyester fiber structure. (2) The cationic dyeable polyester fiber structure according to (1), wherein the quinoline compound is at least one compound selected from the group consisting of oxolinic acid, ciprofloxacin, levofloxacin, moxifloxacin, difluoromethoxygarenoxacin, and sitafloxacin. (3) The cationic dyeable polyester fiber structure according to (1), wherein the quinoline-based compound is oxolinic acid. (4) The cationic dyeable polyester fiber structure according to any one of (1) to (3), wherein the ultraviolet absorber is a benzotriazole-based compound. (5) The cationic dyeable polyester fiber structure according to (4), which contains the benzotriazole-based compound in an amount of 0.25% by mass or more and 2.00% by mass or less relative to the mass of the cationic dyeable polyester fiber structure. (6) A medical uniform comprising the cationic dyeable polyester fiber structure according to any one of (1) to (5). (7) a processing solution preparation step of preparing a processing solution containing a cationic dye, a quinoline-based compound, and an ultraviolet absorber; a chemical solution treatment step in which a fiber substrate containing cationic dyeable polyester fiber is immersed in the treatment solution and heat-treated in a bath at a temperature of 110°C or higher and 140°C or lower under pressure; a post-heat treatment process in which dry heat treatment is performed at an atmospheric temperature of 150°C or higher and 190°C or lower; A method for producing a cationic dyeable polyester fiber structure, comprising: The cationic dye, the quinoline-based compound, and the ultraviolet absorber are included, The quinoline-based compound is contained in an amount of 0.03% by mass or more and 0.80% by mass or less relative to the mass of the cationic dyeable polyester fiber structure, the color difference ΔE before and after irradiation of the cationic dyeable polyester fiber structure with ultraviolet carbon arc lamp light is 2.0 or less, In addition, the antibacterial activity value after 50 high-temperature accelerated washes is A according to the antibacterial evaluation method described in the SEK Mark textile product certification standards. 50 is greater than the standard fabric growth value F, A method for producing a cationic dyeable polyester fiber structure. (8) The method for producing a cation-dyeable polyester fiber structure according to (7), wherein the treatment liquid preparation step uses a treatment liquid containing the quinoline compound in an amount of 0.003 mass % or more and 0.080 mass % or less relative to the mass of the treatment liquid. (9) The method for producing a cationic dyeable polyester fiber structure according to (7) or (8), wherein the ultraviolet absorber is a benzotriazole-based compound. (10) The method for producing a cation-dyeable polyester fiber structure according to (9), wherein the treatment liquid preparation step uses a treatment liquid containing the benzotriazole compound in an amount of 0.025% by mass or more and 0.200% by mass or less relative to the mass of the treatment liquid. [Effects of the Invention]

[0012] According to the present invention, when a cationic dyeable polyester fiber and a cationic dye are used, it is possible to provide a cationic dyeable polyester fiber and a method for producing the same that exhibit excellent lightfastness and antibacterial properties after washing. Specifically, it is possible to provide a cationic dyeable polyester fiber that exhibits lightfastness such that when the cationic dyeable polyester fiber structure is irradiated with ultraviolet carbon arc lamp light specified in JIS L 0842:2004 before washing, the color difference ΔE between before and after irradiation is 2.0 or less, and that exhibits antibacterial properties that satisfy the evaluation criteria for "antibacterial finish (specific use: red)" in the SEK Mark textile product certification standards after 50 high-temperature accelerated washes.

[0013] Furthermore, since it becomes possible to process the dye, the quinoline compound, and the ultraviolet absorber in the same bath, it is possible to provide a method for producing a cation-dyeable polyester fiber structure that can be produced at low cost. DETAILED DESCRIPTION OF THE INVENTION

[0014] [Cationic dyeable polyester fiber structure] The present invention is described in detail below with reference to preferred embodiments, but is not limited to these. The cationic dyeable polyester fiber structure of the present invention comprises a cationic dye, a quinoline-based compound, and an ultraviolet absorber, and the quinoline-based compound is contained in an amount of 0.03 mass % to 0.80 mass % relative to the mass of the cationic dyeable polyester fiber structure. The color difference ΔE before and after irradiation of the cationic dyeable polyester fiber structure with ultraviolet carbon arc light is 2.0 or less, and the antibacterial activity value A after 50 high-temperature accelerated washings is 0.03 mass % to 0.80 mass % based on the mass of the cationic dyeable polyester fiber structure. 50 is greater than the standard fabric growth value F.

[0015] In this invention, the "SEK Mark Textile Product Certification Standards" refers to the "SEK Mark Textile Product Certification Standards" (Document Control Number: JEC301) of the Japan Textile Evaluation Technology Council, a general incorporated association, revised on April 1, 2024.

[0016] <Fiber base material> As the fiber substrate constituting the cationic dyeable polyester fiber structure of the present invention, fabric-like materials such as woven fabrics, knitted fabrics, and nonwoven fabrics can be preferably used. The form of the fiber substrate may be either a filament yarn or a spun yarn, but is not limited to these. If necessary, synthetic fibers other than cationic dyeable polyester fibers, such as polyester, acrylic, and nylon, natural fibers such as cotton, wool, and silk, and semi-synthetic fibers such as rayon and acetate, may be combined and used in the form of a union weave, union knit, mixed weave, mixed spinning, or mixed fiber.

[0017] Although there are no limitations on the proportion of the cationic dyeable polyester fiber contained in the fiber substrate according to the present invention, a higher proportion can improve the lightfastness and antibacterial properties after washing in the present invention. Therefore, the cationic dyeable polyester fiber preferably accounts for 50% by mass or more, more preferably 60% by mass or more, and even more preferably 80% by mass or more of the total mass of the fiber substrate.

[0018] The cationic dyeable polyester fiber of the present invention is a fiber obtained by melt-spinning a resin made of cationic dyeable polyester. Here, cationic dyeable polyester is a copolymerized polyester obtained by polymerizing, as a carboxylic acid component, terephthalic acid or its ester derivative and an aromatic dicarboxylic acid containing a sulfonate metal salt group, together with an alkylene glycol component such as ethylene glycol or trimethylene glycol. Known cationic dyeable polyester fibers can be used in the present invention.

[0019] There are no particular restrictions on the fineness of the cationic dyeable polyester fiber, but it is preferable that the single fiber fineness be 0.04 dtex or more and 5.00 dtex or less, since the effects of the present invention can be significantly exhibited.

[0020] The cationic dyeable polyester fiber structure of the present invention may contain any amount of other chemicals such as a water absorbing agent and a fluorescent whitening agent in addition to the cationic dye, quinoline compound, and ultraviolet absorber described below.

[0021] <Cationic dyes> The cationic dyeable polyester fiber structure of the present invention contains a cationic dye. The cationic dye is a water-soluble dye used for dyeing synthetic fibers such as cationic dyeable polyester fibers and acrylic fibers. The cationic dye is characterized by dyeing through ionic bonding between a cationic substituent in the cationic dye and an anionic substituent, such as a sulfonic acid group, in the cationic dyeable polyester fiber.

[0022] The type of cationic dye used in the present invention is not particularly limited, and any known cationic dye can be used. Furthermore, the amount of dye attached to the fiber substrate is not limited, as long as the dye required to express the desired hue is attached.

[0023] <Quinoline compounds> The cationic dyeable polyester fiber structure of the present invention contains a quinoline-based compound, such as oxolinic acid (5-ethyl-8-oxo-[1,3]dioxolo[4,5-g]quinoline-7-carboxylic acid), ciprofloxacin (1-cyclopropyl-1,4-dihydro-6-fluoro-4-oxo-7-(1-piperazinyl)-3-quinolinecarboxylic acid), levofloxacin ((3S)-9-fluoro-3-methyl-10-(4-methyl-1-piperazinyl)-7-oxo-2,3-dihydro-7H-pyrido[1,2,3-de][1,4]benzoxazine-6-carboxylic acid), moxifloxacin ((1S,6S)-1-cyclopropyl-7-(2,8-diazabicyclo[4.3.0]non-8-yl)benzoxazine-6-carboxylic acid), or the like. Preferably, the compound is at least one compound selected from the group consisting of 1-cyclopropyl-8-(difluoromethoxy)-7-[(1R)-1-methyl-2,3-dihydro-1H-isoindol-5-yl]-6-fluoro-8-methoxy-4-oxo-1,4-dihydroquinoline-3-carboxylic acid), garenoxacin (1-cyclopropyl-8-(difluoromethoxy)-7-[(1R)-1-methyl-2,3-dihydro-1H-isoindol-5-yl]-4-oxo-1,4-dihydroquinoline-3-carboxylic acid), and sitafloxacin (7-[(7S)-7-amino-5-azaspiro[2.4]heptan-5-yl]-8-chloro-6-fluoro-1-[(1R,2S)-2-fluorocyclopropyl]-4-oxo-1,4-dihydroquinoline-3-carboxylic acid). In the present invention, it is more preferable to use oxolinic acid.

[0024] The quinoline compounds listed above may be in the form of a polyvalent metal salt such as an alkali metal salt such as a sodium salt or a potassium salt, an alkaline earth metal salt such as a calcium salt or a magnesium salt, an aluminum salt or an iron salt.

[0025] The mass of the quinoline-based compound contained in the cationic dyeable polyester fiber structure of the present invention is 0.03 mass% or more, preferably 0.15 mass% or more, based on the fiber structure. A mass of the quinoline-based compound of 0.03 mass% or more ensures the antibacterial effect of the present invention. On the other hand, if the mass of the quinoline-based compound is high, the antibacterial property is good, but the lightfastness tends to decrease. Furthermore, a large amount of the white quinoline-based compound adheres to the surface of the cationic dyeable polyester fiber structure, which tends to whiten the fiber structure and change its hue. Therefore, the mass of the quinoline-based compound contained in the cationic dyeable polyester fiber structure is 0.80 mass% or less, preferably 0.50 mass% or less, and more preferably 0.20 mass% or less, based on the fiber structure. By containing the quinoline-based compound within the above range, the cationic dyeable polyester fiber structure maintains good antibacterial property even after 50 high-temperature accelerated washings. The mass of the quinoline-based compound contained in the cationic dyeable polyester fiber structure of the present invention is measured using the method described below.

[0026] <UV absorber> The cationic dyeable polyester fiber structure of the present invention contains an ultraviolet absorber. The ultraviolet absorber in the present invention is a functional finishing agent having an aromatic compound that converts absorbed ultraviolet light into thermal energy or light energy with a wavelength longer than that of ultraviolet light. By attaching an ultraviolet absorber to the cationic dyeable polyester fiber structure of the present invention, lightfastness can be improved and fading can be suppressed. Examples of the ultraviolet absorber of the present invention include benzotriazole-based compounds, benzophenone-based compounds, and triazine-based compounds. Because benzotriazole-based compounds absorb ultraviolet light over a wide wavelength range, the ultraviolet absorber of the present invention is preferably a benzotriazole-based compound.

[0027] The benzotriazole compound of the present invention is represented by the following general formula (1).

[0028] [ka]

[0029] (In the above formula, R 1 represents a hydrogen atom, a halogen atom, or an alkyl group, and R 2 and R 3 each represents a hydrogen atom or an alkyl or alkoxy group having 1 to 22 carbon atoms. Preferred benzotriazole compounds include 2-(2'-hydroxy-5'-methylphenyl)benzotriazole, 2-(2'-hydroxy-3'-tert-butyl-5'-methylphenyl)-5-chlorobenzotriazole, 2-(2'-hydroxy-3',5'-di-tert-amylphenyl)benzotriazole, 2-(2'-hydroxy-5'-tert-octylphenyl)benzotriazole, 2-[2-hydroxy-3,5-bis(α,α-dimethylbenzyl)phenyl]-2H-benzotriazole, 2-(3,5-di-tert-butyl-2-hydroxyphenyl)-5-chlorobenzotriazole, and 2-(2H-benzotriazol-2-yl)-6-(1-methyl-1-phenylmethyl)-4-(1,1,3,3-tetramethylbutyl)phenol.

[0030] The cationic dyeable polyester fiber structure of the present invention preferably contains 0.25% by mass or more of a benzotriazole-based compound, more preferably 0.50% by mass or more. When the cationic dyeable polyester fiber structure contains 0.25% by mass or more of a benzotriazole-based compound, lightfastness is improved. On the other hand, the cationic dyeable polyester fiber structure of the present invention preferably contains 2.00% by mass or less of a benzotriazole-based compound, more preferably 1.00% by mass or less. The cationic dyeable polyester fiber structure of the present invention exhibits good lightfastness even after 50 high-temperature accelerated washings, when the cationic dyeable polyester fiber structure contains 0.25% by mass or more and 2.00% by mass or less of a benzotriazole-based compound. The mass ratio of the ultraviolet absorber to the mass of the cationic dyeable polyester fiber structure of the present invention is measured by the method described below.

[0031] <Antibacterial properties of cationic dyeable polyester fiber structures> The cationic dyeable polyester fiber structure of the present invention has an antibacterial activity value of A after 50 high-temperature accelerated washings in the antibacterial evaluation method described in the SEK Mark textile product certification standards established by the Japan Textile Evaluation Technology Council. 50 is greater than the standard fabric growth value F. In other words, it is possible to provide a cationic dyeable polyester fiber structure with antibacterial properties that meet the evaluation criteria for "antibacterial processing (specific use: red)" of the SEK Mark textile product certification standards after 50 high-temperature accelerated washings. The high-temperature accelerated washing and antibacterial property tests are evaluated using the methods described below.

[0032] <Lightfastness of cationic dyeable polyester fiber structures> Furthermore, the cationic dyeable polyester fiber structure of the present invention has a color difference ΔE of 2.0 or less before and after irradiation of the cationic dyeable polyester fiber structure with ultraviolet carbon arc lamp light. Here, the phrase "irradiating the cationic dyeable polyester fiber structure with ultraviolet carbon arc lamp light" refers to irradiating the exposed portion with ultraviolet carbon arc lamp light by the third exposure method in accordance with JIS L 0842:2004 until standard fading occurs. The "color difference ΔE" is the difference between the lightness L and the lightness L defined by the International Commission on Illumination (CIE). * , a represents saturation * and b * L, which is expressed by three variables: * a * b * It is a value that represents the distance between two points in color space. The smaller the color difference ΔE, the smaller the color change due to light exposure, which means that the color has a higher lightfastness. The blue scale, which is a standard for checking standard fading, is used as an indicator of lightfastness. For clothing applications, blue scale grade 4 is often used as the standard, which corresponds to a color difference ΔE of approximately 2.0.

[0033] [Application] The cationic dyeable polyester fiber structure of the present invention can be used in various applications requiring high lightfastness and antibacterial properties, and can be used, for example, as fabrics for clothing, bedding, towels, rugs, curtains, sheets, etc.

[0034] The cationic dyeable polyester fiber structure of the present invention can be used for general clothing, uniforms, formal and business clothing, work clothes, sportswear, etc., as well as medical uniforms such as white coats, scrubs, casey coats, doctor coats, nurse uniforms, and tunics worn by medical professionals, etc. The cationic dyeable polyester fiber structure of the present invention is particularly preferably used in medical uniforms.

[0035] [Method for producing cationic dyeable polyester fiber structure] The method for producing a cationic dyeable polyester fiber structure of the present invention includes a treatment solution preparation step of preparing a treatment solution containing a cationic dye, a quinoline-based compound, and an ultraviolet absorber; a chemical solution treatment step of immersing a fiber substrate containing cationic dyeable polyester fiber in the treatment solution and heat-treating it in a bath at a temperature of 110°C or higher and 140°C or lower under pressure; and a post-heat treatment step of performing dry heat treatment at an atmospheric temperature of 150°C or higher and 190°C or lower, wherein the cationic dye, the quinoline-based compound, and the ultraviolet absorber are contained, and the quinoline-based compound is contained in an amount of 0.03% by mass or higher and 0.80% by mass or lower relative to the mass of the cationic dyeable polyester fiber structure, and the color difference ΔE before and after irradiation of the cationic dyeable polyester fiber structure with ultraviolet carbon arc lamp light is 2.0 or lower, and the antibacterial activity value A after 50 high-temperature accelerated washings is 0.03% by mass or higher and 0.80% by mass or lower according to the antibacterial evaluation method described in the SEK Mark Textile Product Certification Standards. 50 The cationic dyeable polyester fiber structure is characterized in that the standard fabric growth value F is greater than the standard fabric growth value F.

[0036] <Processing solution preparation process> In the treatment liquid preparation step, a treatment liquid containing a cationic dye, a quinoline-based compound, and an ultraviolet absorber is prepared. For example, the treatment liquid can be prepared by adding the cationic dye, the quinoline-based compound, and the ultraviolet absorber in any order at room temperature.

[0037] The cationic dye can be used in any amount depending on the hue of the textile product to be produced.

[0038] Furthermore, the treatment solution used contains preferably 0.003% by mass or more and 0.080% by mass or less of the quinoline compound, more preferably 0.006% by mass or more and 0.045% by mass or less, and even more preferably 0.009% by mass or more and 0.020% by mass or less, relative to the mass of the treatment solution. By adjusting the content within this range, the amount of the quinoline compound attached to the cationic dyeable polyester fiber structure becomes 0.03% by mass or more and 0.80% by mass or less, relative to the mass of the cationic dyeable polyester fiber structure.

[0039] Furthermore, the ultraviolet absorber is preferably a benzotriazole-based compound, and in this case, a treatment liquid containing preferably 0.025% by mass to 0.200% by mass, more preferably 0.050% by mass to 0.100% by mass of the benzotriazole-based compound relative to the mass of the treatment liquid is used. By adjusting the amount within the above range, the amount of the benzotriazole-based compound attached to the cationic dyeable polyester fiber structure becomes 0.25% by mass to 2.00% by mass, relative to the mass of the cationic dyeable polyester fiber structure.

[0040] <Chemical treatment process> The chemical solution treatment step employs an in-bath processing method. The in-bath processing method referred to here is a method of adhering the treatment solution to the cationic dyeable polyester fiber substrate by immersing the cationic dyeable polyester fiber substrate in a bath containing the treatment solution and then performing a heat treatment.

[0041] In this step, first, a cationic dyeable polyester fiber substrate is placed in the treatment liquid prepared in the treatment liquid preparation step at a bath ratio (mass of cationic dyeable polyester fiber substrate:mass of treatment liquid) of 1:5 to 1:30, and then heat treatment is carried out in a bath at a temperature of 110°C or higher and 140°C or lower under pressure in a sealed container.

[0042] In the chemical treatment step of the present invention, the treatment is completed in one treatment bath, and therefore the number of steps can be reduced compared to when the steps of applying the cationic dye, the quinoline compound, and the UV absorber are each performed in separate baths, thereby improving productivity and enabling the production of the cationic dyeable polyester fiber structure of the present invention at low cost.

[0043] When chemical treatment with at least one of a quinoline compound and an ultraviolet absorber is performed by padding, the lightfastness of the present invention is not exhibited and / or the antibacterial performance after washing of the present invention is not exhibited. The padding treatment method referred to here is a method in which the cationic dyeable polyester fiber substrate is immersed in a treatment solution, squeezed with a mangle roller or the like so that a certain amount of the treatment solution is adhered to the substrate, and then subjected to dry heat treatment in a dryer or wet heat treatment under saturated water vapor at 100°C, thereby adhering the treatment solution to the cationic dyeable polyester fiber substrate.

[0044] <Post-heat treatment process> In the post-heat treatment step, the cationic dyeable polyester fiber substrate that has been wet-heat treated in the chemical treatment step is set in a pin tenter and subjected to dry heat treatment at an ambient temperature of 150°C or higher and 190°C or lower for 15 seconds to 5 minutes.

[0045] <Post-processing process> The cationic dyeable polyester fiber structure of the present invention is obtained through the above-mentioned post-heat treatment step, but in the method for producing the cationic dyeable polyester fiber structure of the present invention, as with general cationic dyeable polyester fiber structures, various further finishing steps can be carried out, such as calendaring, which improves the light reflection of the surface of the cationic dyeable polyester fiber structure by compressing and smoothing the structure with a roller or the like to give it a glossy feel, and raising, which involves scratching or abrading the surface of the cationic dyeable polyester fiber structure with a needle or abrasive cloth to fluff it and impart heat retention and flexibility. Of course, in the present invention, the cationic dyeable polyester fiber structure obtained by carrying out this finishing step is also considered to be the cationic dyeable polyester fiber structure of the present invention. [Example]

[0046] The present invention will now be described in more detail with reference to examples, but the present invention is not limited to these examples. The washing methods and various test methods used in the examples were as follows.

[0047] (Washing method) This was in accordance with the "SEK Mark Textile Product Washing Method," a certification standard of the Japan Textile Evaluation Technology Council, a general incorporated association. That is, using a washing machine, 120 mL of "JAFET standard blend detergent" was added to 90 L of water to make the washing liquid. Next, the cationic dyeable polyester fiber structure and, if necessary, a load cloth were added so that the liquor ratio of this washing liquid (mass of cationic dyeable polyester fiber structure: mass of washing liquid) was 1:30, and the total mass of the cationic dyeable polyester fiber structure and the load cloth was adjusted to 3 kg. After that, 1) Wash at 80°C for 120 minutes 2) Drainage The washing machine was then rinsed using a standard washing capacity and standard water volume household washing machine with a centrifugal wringer that conforms to the standard of JIS C 9606:2007 (electric washing machine) specified in "Appendix 1 Test Methods by Symbol - Washing Method (Water Washing), Number 103" in JIS L 0217:1995 "Display Symbols and Their Display Methods for Handling Textile Products." That is, 3) Thoroughly dehydrate the cationic dyeable polyester fiber structure and the loaded fabric for 3 to 5 minutes. 4) 15-minute overflow rinse (aim for 3 to 5 times the amount of water replaced) 5) Dehydrate in the same way as 4). After that, steps 3) to 5) were repeated a total of four times, and then steps 1) to 5) were repeated a total of five times using a washing machine and a household washing machine. Finally, only the cationic dyeable polyester fiber structure was taken out, 6) Rinse with overflow water for 5 minutes using a household washing machine (aim for 3 to 5 times the amount of water replaced). 7) Dehydrate in the same way as in 3). 8) Dry at a temperature of 80°C or less In step 8), the product was hung to dry or laid flat to dry in a place where it was not exposed to direct sunlight.

[0048] (Antibacterial test) 1) Test method: The test was carried out using the bacterial liquid absorption method based on JIS L 1902:2015 "Test methods for antibacterial activity and antibacterial effect of textile products." The test was carried out under the condition that the nonionic surfactant "Tween" (registered trademark) 80 was added to the test bacterial suspension in an amount of 0.05% by mass relative to the mass of the cationic dyeable polyester fiber structure. 2) Test strain: Staphylococcus aureus 3) Evaluation method: The evaluation criteria for antibacterial processing (specific use: red) in "18.3 Evaluation criteria for bacterial liquid absorption method" of the "SEK Mark Textile Product Certification Standards" mentioned above were followed. That is, the antibacterial activity value of the cationic dyeable polyester fiber structure after antibacterial processing after washing 50 times was evaluated as A. 50 , the growth value of the unwashed standard cloth is F, A 50 > F, that is, A 50 -If F>0, the antibacterial property is good, and A 50 If -F≦0, the antibacterial property was judged to be poor. The standard cloth refers to a white cloth (cotton No. 3-1) attached to JIS L 0803, which is sold by the Japan Textile Evaluation Technology Council as a standard cloth (cotton) for antibacterial testing and is listed in the proviso of "3.1 Control specimen" in JIS L 1902:2015 "Antibacterial test method and antibacterial effect of textile products," and which has been washed with water.

[0049] Here, the antibacterial activity value A after n washings n The growth value F of the standard cloth was calculated using the following formulas (2) and (3). A n =(log C t -log C o )-(log T t -log T o ) …(2) F=log C t -log C o …(3) log Co : Common logarithm of the arithmetic mean of the viable bacterial counts of three samples immediately after inoculation of the test bacteria on the standard cloth log C t : Common logarithm of the arithmetic mean of the viable bacterial counts of three samples after 18 hours of incubation of the standard cloth log T o : Common logarithm of the arithmetic mean of the number of viable bacteria in three samples immediately after inoculation of the test bacteria in the fiber structure of the present invention log T t : Common logarithm of the arithmetic mean of the viable bacterial counts of three samples after 18 hours of culture in the fiber structure of the present invention The antibacterial activity value A0 of the cationic dyeable polyester fiber structure after antibacterial treatment before washing was also evaluated using the above method.

[0050] (Light fastness test) 1) Light irradiation conditions: The antibacterial cationic dyeable polyester fiber structure was irradiated with ultraviolet carbon arc light until the exposed area showed standard fading, in accordance with the third exposure method of the "Test method for color fastness to ultraviolet carbon arc light" specified in JIS L 0842:2004. 2) Measurement of color difference ΔE before and after irradiation of cationic dyeable polyester fiber structure with ultraviolet carbon arc lamp light: Using a spectrophotometer model CM-3700d (manufactured by Konica Minolta, Inc.), the diffuse reflectance of the cationic dyeable polyester fiber structure before and after irradiation with ultraviolet carbon arc lamp light at a light source of D65 and a 10-degree field of view was measured, and the brightness difference ΔE was calculated. * , a * The difference is Δa * , b * The difference is Δb * The color difference ΔE was calculated using the following formula (4). ΔE={(ΔL * ) 2 +(Δa * ) 2 +(Δb * ) 2} 1 / 2 …(4) Here, the brightness difference ΔL * , and Δa * Δb *JIS Z8781-4:2013 "Colorimetry - Part 4: CIE 1976 L * a * b * Color Space: 3.7 CIELAB1976 ab lightness difference, ΔL * " and "3.8 CIELAB1976 a * , b * Difference, Δa * , Δb * " is the value specified in

[0051] The cationic dyeable polyester fiber structure after washing was also subjected to a light fastness test using the above method. In Table 1 described later, the color difference ΔE before and after irradiation of the cationic dyeable polyester fiber structure with ultraviolet carbon arc lamp light is simply referred to as "color difference ΔE."

[0052] (Ratio of the mass of quinoline compounds to the mass of cationic dyeable polyester fiber structure) 1.00 g of the antibacterially treated cationic dyeable polyester fiber structure was weighed out and immersed in a solution of methanol and aqueous sodium hydroxide solution to dissolve the cationic dyeable polyester fiber structure. The solution was then filtered through a filter. The mass of the quinoline-based compound attached to the cationic dyeable polyester fiber structure was then measured using high-performance liquid chromatography. The mass ratio (mass%) of the quinoline-based compound to the mass of the accurately weighed cationic dyeable polyester fiber structure was then calculated.

[0053] In the column for cationic dyeable polyester fiber structures in Table 1, the "ratio of the mass of quinoline-based compound to the mass of cationic dyeable polyester fiber structure" is expressed as "quinoline-based compound."

[0054] (Ratio of mass of ultraviolet absorber to mass of cationic dyeable polyester fiber structure) 300 g of the cationic dyeable polyester fiber substrate before the chemical treatment step was dried at 100°C for 60 minutes, and then the cationic dyeable polyester fiber substrate was left to stand in a desiccator containing silica gel as a desiccant for 20 minutes to dissipate heat. The mass of the cationic dyeable polyester fiber substrate was then immediately measured using a precision balance. The mass of the cationic dyeable polyester fiber structure after the post-heat treatment step using the method described in the Examples was also measured in the same manner, and the mass ratio (mass%) of the ultraviolet absorber to the cationic dyeable polyester fiber structure was calculated using the following formula (5). Mass ratio of ultraviolet absorber (mass%) = {(amount of structural substance of cationic dyeable polyester fiber after post-heat treatment - amount of attached quinoline compound - mass of untreated cationic dyeable polyester fiber substrate) / amount of structural substance of cationic dyeable polyester fiber after post-heat treatment} × 100 ... (5) In the column for cationic dyeable polyester fiber structure in Table 1, the "ratio of the mass of the ultraviolet absorber to the mass of the cationic dyeable polyester fiber structure" is expressed as "ultraviolet absorber."

[0055] [Example 1] (1) Preparation of cationic dyeable polyester fiber substrate A woven fabric was used as the warp and weft of cationic dyeable polyester fiber consisting of a multifilament of 167 dtex and 72 filaments (single fiber fineness 2.32 dtex) composed of copolymerized polyethylene terephthalate copolymerized with 1.7 mol% of 5-sodium sulfoisophthalic acid. The fabric was heat-set by dry heat at 175°C for 0.5 minutes to produce a cationic dyeable polyester fiber substrate.

[0056] (2) Processing solution preparation process A treatment solution containing a cationic dye, a quinoline compound, an ultraviolet absorber, and a dyeing acid was prepared. The following chemicals were used, and the mass ratio of each chemical to the mass of the treatment solution was adjusted as follows: Cationic dye: Kayacryl Blue BG-ED (manufactured by Nippon Kayaku Co., Ltd.), 0.200% by mass Quinoline compounds: oxolinic acid, 0.003% by mass UV absorber: 2-(2'-hydroxy-3'-tert-butyl-5'-methylphenyl)-5-chlorobenzotriazole, 0.025% by mass Dyeing acid: 70% acetic acid / 30% sodium acetate mixed aqueous solution, 0.005% by mass In the manufacturing method column of Table 1, the "ratio of the mass of the quinoline-based compound to the mass of the treatment liquid" is expressed as "quinoline-based compound," and the "ratio of the mass of the ultraviolet absorber to the mass of the treatment liquid" is expressed as "ultraviolet absorber."

[0057] (3) Chemical treatment process A cationic dyeable polyester fiber substrate was immersed in the treatment solution prepared above and subjected to chemical treatment at 120°C for 30 minutes under pressure in a bath processing machine. Thereafter, the cationic dyeable polyester fiber substrate was removed from the bath processing machine and subjected to water washing and dehydration. Here, the following equipment was used for the bath processing machine, and the bath ratio was as follows. Bath processing machine: 12-color rotary pot dyeing tester (MINI-COLOUR 12EL type: manufactured by Texam Giken Co., Ltd.) Liquor ratio (mass of cationic dyeable polyester fiber substrate: mass of treatment liquid): 1:10 (4) Post-heat treatment process The chemically treated cationic dyeable polyester fiber substrate was set in a pin tenter and heat-set with dry heat at 170°C for 1 minute to obtain a cationic dyeable polyester fiber structure. The results are shown in Table 1.

[0058] The cationic dyeable polyester fiber structure obtained through the above process had a color difference ΔE before washing of 1.62 and good light fastness. 50 The color difference ΔE after washing was 1.71, and the index of antibacterial activity before washing (A0-F) was 1.4, indicating that the lightfastness after washing and the antibacterial activity before washing were both good.

[0059] [Example 2] The same procedure as in Example 1 was carried out, except that 2-(2'-hydroxy-3'-tert-butyl-5'-methylphenyl)-5-chlorobenzotriazole was used at 0.100% by mass. The results are shown in Table 1. The cationic dyeable polyester fiber structure obtained through the above steps had a color difference ΔE before washing of 1.52 and good light fastness. In addition, the index of antibacterial activity (A 50 The color difference ΔE after washing was 1.65, and the index of antibacterial activity before washing (A0-F) was 1.7, indicating that the lightfastness after washing and the antibacterial activity before washing were both good.

[0060] [Example 3] The same procedure as in Example 2 was carried out, except that oxolinic acid was used at 0.006% by mass. The cationic dyeable polyester fiber structure obtained through the above steps had a color difference ΔE before washing of 1.62 and good light fastness. In addition, the index of antibacterial activity (A 50 The color difference ΔE after washing was 1.69, and the index of antibacterial activity before washing (A0-F) was 2.1, indicating that the lightfastness after washing and the antibacterial activity before washing were both good.

[0061] [Example 4] The same procedure as in Example 2 was carried out, except that oxolinic acid was used at 0.009% by mass. The cationic dyeable polyester fiber structure obtained through the above steps had a color difference ΔE before washing of 1.75 and good light fastness. In addition, the index of antibacterial activity (A 50 The color difference ΔE after washing was 1.70, and the index of antibacterial activity before washing (A0-F) was 3.3, indicating that the lightfastness after washing and the antibacterial activity before washing were both good.

[0062] [Example 5] The same procedure as in Example 2 was carried out, except that oxolinic acid was used at 0.012% by mass. The cationic dyeable polyester fiber structure obtained through the above steps had a color difference ΔE before washing of 1.83 and good light fastness. In addition, the index of antibacterial activity (A 50 The color difference ΔE after washing was 1.89, and the index of antibacterial activity before washing (A0-F) was 2.8, indicating that the lightfastness after washing and the antibacterial activity before washing were both good.

[0063] [Example 6] The same procedure as in Example 2 was carried out, except that oxolinic acid was used at 0.015% by mass. The cationic dyeable polyester fiber structure obtained through the above steps had a color difference ΔE before washing of 1.91 and good light fastness. In addition, the index of antibacterial activity (A 50 The color difference ΔE after washing was 1.75, and the index of antibacterial activity before washing (A0-F) was 3.1, indicating that the lightfastness after washing and the antibacterial activity before washing were both good.

[0064] [Example 7] The same procedure as in Example 6 was carried out, except that 2-(2'-hydroxy-3'-tert-butyl-5'-methylphenyl)-5-chlorobenzotriazole was used at 0.200 mass%. The cationic dyeable polyester fiber structure obtained through the above steps had a color difference ΔE before washing of 1.86 and good light fastness. In addition, the index of antibacterial activity (A 50 The color difference ΔE after washing was 1.80, and the index of antibacterial activity before washing (A0-F) was 2.5, indicating that the lightfastness after washing and the antibacterial activity before washing were both good.

[0065] [Example 8] The same procedure as in Example 1 was carried out, except that 2-(2'-hydroxy-3'-tert-butyl-5'-methylphenyl)-5-chlorobenzotriazole was used at 0.150% by mass. The cationic dyeable polyester fiber structure obtained through the above steps had a color difference ΔE before washing of 1.50 and good light fastness. In addition, the index of antibacterial activity (A 50 The color difference ΔE after washing was 1.55, and the index of antibacterial activity before washing (A0-F) was 1.4, indicating that the lightfastness after washing and the antibacterial activity before washing were both good.

[0066] [Example 9] The same procedure as in Example 1 was carried out, except that 2-(2'-hydroxy-3'-tert-butyl-5'-methylphenyl)-5-chlorobenzotriazole was used at 0.200 mass %. The cationic dyeable polyester fiber structure obtained through the above steps had a color difference ΔE before washing of 1.48 and good light fastness. In addition, the index of antibacterial activity (A 50 The color difference ΔE after washing was 1.54, and the index of antibacterial activity before washing (A0-F) was 0.6, indicating that the lightfastness after washing and the antibacterial activity before washing were both good.

[0067] [Example 10] The same procedure as in Example 6 was carried out, except that 2-(2'-hydroxy-3'-tert-butyl-5'-methylphenyl)-5-chlorobenzotriazole was used at 0.050% by mass. The cationic dyeable polyester fiber structure obtained through the above steps had a color difference ΔE before washing of 1.92 and good light fastness. In addition, the index of antibacterial activity (A 50 The color difference ΔE after washing was 1.80, and the index of antibacterial activity before washing (A0-F) was 3.2, indicating that the lightfastness after washing and the antibacterial activity before washing were both good.

[0068] [Example 11] The same procedure as in Example 6 was carried out, except that 2-(2'-hydroxy-3'-tert-butyl-5'-methylphenyl)-5-chlorobenzotriazole was used at 0.025% by mass. The cationic dyeable polyester fiber structure obtained through the above steps had a color difference ΔE before washing of 1.98 and good light fastness. In addition, the index of antibacterial activity (A 50 The color difference ΔE after washing was 1.85, and the index of antibacterial activity before washing (A0-F) was 3.4, indicating that the lightfastness after washing and the antibacterial activity before washing were both good.

[0069] [Comparative Example 1] The same procedure as in Example 1 was carried out, except that oxolinic acid and 2-(2'-hydroxy-3'-tert-butyl-5'-methylphenyl)-5-chlorobenzotriazole were not added to the treatment solution. The results are shown in Table 1. The cationic dyeable polyester fiber structure obtained through the above steps had a color difference ΔE before washing of 5.08 and poor light fastness. In addition, the index of antibacterial activity (A 50 The color difference ΔE after washing was 4.95, and the antibacterial activity value (A0-F) before washing was -1.9, indicating that the lightfastness after washing and the antibacterial activity before washing were also poor.

[0070] Comparative Example 2 The same procedure as in Comparative Example 1 was carried out except that 0.015% by mass of oxolinic acid was added. The cationic dyeable polyester fiber structure obtained through the above steps had a color difference ΔE before washing of 8.67 and poor light fastness, but the index of antibacterial activity (A 50 The antibacterial activity value (A0-F) before washing was 3.4, indicating that the antibacterial activity before washing was good, although the color difference ΔE after washing was 7.28, indicating that the lightfastness was poor. The ΔE value was larger than in Comparative Example 1, indicating that quinoline compounds reduce lightfastness when cationic dyes are used.

[0071] Comparative Example 3 The same procedure as in Comparative Example 1 was carried out except that 0.045% by mass of oxolinic acid was added. The cationic dyeable polyester fiber structure obtained through the above steps had a color difference ΔE before washing of 10.53 and poor light fastness, but the index of antibacterial activity (A 50 The color difference ΔE after washing was 10.76, and the lightfastness was poor, but the antibacterial activity value (A0-F) before washing was 3.4, and the antibacterial activity before washing was good. * The value was 38.51, and slight whitening was observed compared to Comparative Example 2.

[0072] Comparative Example 4 The same procedure as in Comparative Example 1 was carried out except that 0.080% by mass of oxolinic acid was added. The cationic dyeable polyester fiber structure obtained through the above steps had a color difference ΔE before washing of 12.98 and poor light fastness, but the index of antibacterial activity (A 50 The color difference ΔE after washing was 12.01, and the lightfastness was poor, but the antibacterial activity value (A0-F) before washing was 3.4, and the antibacterial activity before washing was good. * The value was 39.92, and slight whitening was observed compared with Comparative Examples 2 and 3.

[0073] Comparative Example 5 The same procedure as in Comparative Example 1 was carried out except that 0.150% by mass of oxolinic acid was added. The cationic dyeable polyester fiber structure obtained through the above steps had a color difference ΔE before washing of 17.62 and poor light fastness, but the index of antibacterial activity (A 50 The color difference ΔE after washing was 17.34, and the lightfastness was poor, but the antibacterial activity value (A0-F) before washing was 3.4, and the antibacterial activity before washing was good. *The value was 49.70, and compared with Comparative Examples 2 to 4, significant whitening was observed.

[0074] Comparative Example 6 The same procedure as in Comparative Example 1 was carried out except that 0.100 mass of 2-(2'-hydroxy-3'-tert-butyl-5'-methylphenyl)-5-chlorobenzotriazole was added. The cationic dyeable polyester fiber structure obtained through the above steps had a color difference ΔE before washing of 1.44 and good light fastness, but the index of antibacterial activity value (A 50 The antibacterial activity value (A0-F) after washing was -1.9, and the antibacterial activity after 50 high-temperature accelerated washings was poor. The color difference ΔE after washing was 1.68, and the lightfastness was good, but the antibacterial activity value before washing (A0-F) was -1.7, and the antibacterial activity before washing was poor.

[0075] Comparative Example 7 Comparative Example 1 was repeated except that a disperse dye (Dianix Black CC-Rnew: manufactured by Dystar Co., Ltd.) was used instead of the cationic dye, and the concentration was 0.225% by mass. The cationic dyeable polyester fiber structure obtained through the above steps had a color difference ΔE before washing of 1.54 and good lightfastness, but the index of antibacterial activity (A 50 The antibacterial activity value (A0-F) after washing was -2.0, indicating that the antibacterial activity after 50 high-temperature accelerated washings was poor. The color difference ΔE after washing was 1.50, indicating that the lightfastness was good, but the antibacterial activity value before washing (A0-F) was -1.8, indicating that the antibacterial activity before washing was poor.

[0076] [Comparative Example 8] Comparative Example 7 was carried out in the same manner as Comparative Example 7, except that 0.004% by mass of oxolinic acid was added. The cationic dyeable polyester fiber structure obtained through the above steps had a color difference ΔE before washing of 1.93 and good light fastness. In addition, the index of antibacterial activity (A 50The color difference ΔE after washing was 1.76, and the antibacterial activity value before washing (A0-F) was 2.0, indicating that the lightfastness after washing and the antibacterial activity before washing were also good. However, compared to when cationic dyes were used, the use of disperse dyes resulted in a fiber structure with poor color development and unclear color.

[0077] Comparative Example 9 Comparative Example 8 was carried out in the same manner as Comparative Example 8, except that the dye was changed to a cationic dye (Kayacryl Blue BG-ED, manufactured by Nippon Kayaku Co., Ltd.). The cationic dyeable polyester fiber structure obtained through the above steps had a color difference ΔE before washing of 5.10 and poor light fastness, but the index of antibacterial activity (A 50 The antibacterial activity value (A0-F) was 1.2, indicating that the antibacterial activity was good after 50 high-temperature accelerated washings. The color difference ΔE after washing was 4.96, indicating that the lightfastness was poor, but the antibacterial activity value (A0-F) before washing was 1.3, indicating that the antibacterial activity was good before washing.

[0078] [Comparative Example 10] Comparative Example 6 was carried out in the same manner as Comparative Example 6, except that 0.002% by mass of oxolinic acid was added. The cationic dyeable polyester fiber structure obtained through the above steps had a color difference ΔE before washing of 1.49 and good light fastness, but the index of antibacterial activity value (A 50 The antibacterial activity value (A0-F) before washing was -0.1, indicating that the antibacterial activity before washing was poor.

[0079] [Comparative Example 11] Comparative Example 6 was carried out in the same manner as Comparative Example 6, except that 0.023% by mass of oxolinic acid was added. The cationic dyeable polyester fiber structure obtained through the above steps had a color difference ΔE before washing of 2.19 and poor light fastness, but the index of antibacterial activity (A 50The antibacterial activity value (A0-F) was 3.4, indicating that the antibacterial activity was good after 50 high-temperature accelerated washings. The color difference ΔE after washing was 2.06, indicating that the lightfastness was poor, but the antibacterial activity value (A0-F) before washing was 3.2, indicating that the antibacterial activity was good before washing.

[0080] [Comparative Example 12] The same procedure as in Comparative Example 11 was carried out, except that 2-(2'-hydroxy-3'-tert-butyl-5'-methylphenyl)-5-chlorobenzotriazole was used at 0.200 mass %. The cationic dyeable polyester fiber structure obtained through the above steps had a color difference ΔE before washing of 2.11 and poor light fastness, but the index of antibacterial activity (A 50 The antibacterial activity value (A0-F) was 3.3, indicating that the antibacterial activity was good after 50 high-temperature accelerated washings. The color difference ΔE after washing was 2.08, indicating that the lightfastness was poor, but the antibacterial activity value (A0-F) before washing was 3.1, indicating that the antibacterial activity was good before washing.

[0081] [Comparative Example 13] The same procedure as in Example 1 was carried out, except that 2-(2'-hydroxy-3'-tert-butyl-5'-methylphenyl)-5-chlorobenzotriazole was used at 0.225% by mass. The cationic dyeable polyester fiber structure obtained through the above steps had a color difference ΔE before washing of 1.48 and good light fastness, but the index of antibacterial activity (A 50 The antibacterial activity value (A0-F) before washing was -0.2, indicating that the antibacterial activity before washing was poor.

[0082] [Comparative Example 14] The same procedure as in Example 6 was carried out, except that 2-(2'-hydroxy-3'-tert-butyl-5'-methylphenyl)-5-chlorobenzotriazole was used at 0.013 mass %. The cationic dyeable polyester fiber structure obtained through the above steps had a color difference ΔE before washing of 3.10 and poor light fastness, but the index of antibacterial activity (A50 The antibacterial activity value (A0-F) before washing was 3.4, indicating that the antibacterial activity was good after 50 high-temperature accelerated washings. The color difference ΔE after washing was 3.06, indicating that the lightfastness was poor, but the antibacterial activity value (A0-F) before washing was 3.4, indicating that the antibacterial activity was good before washing.

[0083] [Comparative Example 15] (1) Preparation of cationic dyeable polyester fiber substrate A woven fabric was used as the warp and weft of cationic dyeable polyester fiber consisting of a multifilament of 167 dtex and 72 filaments (single fiber fineness 2.32 dtex) composed of copolymerized polyethylene terephthalate copolymerized with 1.7 mol% of 5-sodium sulfoisophthalic acid. The fabric was heat-set by dry heat at 175°C for 0.5 minutes to produce a cationic dyeable polyester fiber substrate.

[0084] (2) Chemical treatment process using bath processing A treatment solution containing a cationic dye, a quinoline compound, and a dyeing acid was prepared using the following chemicals, with the mass ratio of each chemical relative to the mass of the treatment solution being as follows: Cationic dye: Kayacryl Blue BG-ED (manufactured by Nippon Kayaku Co., Ltd.), 0.200% by mass Quinoline compounds: oxolinic acid, 0.012% by mass Dyeing acid: 70% acetic acid / 30% sodium acetate mixed aqueous solution, 0.005% by mass Thereafter, the cationic dyeable polyester fiber substrate was immersed in the treatment solution prepared above and subjected to chemical solution treatment at 120°C for 30 minutes under pressure in a bath processing machine. Thereafter, the cationic dyeable polyester fiber substrate was removed from the bath processing machine and subjected to water washing and dehydration. Here, the following device was used for the bath processing machine, and the bath ratio was as follows. In-bath processing machine: 12-color rotary pot dyeing tester (MINI-COLOUR 12EL type: manufactured by Texam Giken Co., Ltd.) Liquor ratio (mass of cationic dyeable polyester fiber substrate: mass of treatment liquid): 1:10 (3) Chemical treatment process using pad processing A treatment liquid containing an ultraviolet absorber was prepared using the following chemicals, and the mass ratio of the ultraviolet absorber to the mass of the treatment liquid was adjusted as follows: UV absorber: 2-(2'-hydroxy-3'-tert-butyl-5'-methylphenyl)-5-chlorobenzotriazole, 0.100% by mass Thereafter, the cationic dyeable polyester fiber substrate was immersed in the treatment liquid prepared above, and squeezed with a mangle roller so that the treatment liquid adhered to the substrate. Thereafter, the cationic dyeable polyester fiber substrate was set in a pin tenter and subjected to a wet heat treatment at 130°C for 2 minutes.

[0085] (4) Post-heat treatment process The chemically treated cationic dyeable polyester fiber substrate was set in a pin tenter and heat-set with dry heat at 170°C for 1 minute to obtain a cationic dyeable polyester fiber structure. The results are shown in Table 1.

[0086] The cationic dyeable polyester fiber structure obtained through the above process had a color difference ΔE of 3.10 before washing and poor light fastness, but the index of antibacterial activity (A 50 The antibacterial activity value (A0-F) was 3.0, indicating that the antibacterial activity was good after 50 high-temperature accelerated washings. The color difference ΔE after washing was 4.03, indicating that the lightfastness was poor, but the antibacterial activity value (A0-F) before washing was 2.8, indicating that the antibacterial activity was good before washing.

[0087] [Comparative Example 16] (1) Preparation of cationic dyeable polyester fiber substrate A woven fabric was used as the warp and weft of cationic dyeable polyester fiber consisting of a multifilament of 167 dtex and 72 filaments (single fiber fineness 2.32 dtex) composed of copolymerized polyethylene terephthalate copolymerized with 1.7 mol% of 5-sodium sulfoisophthalic acid. The fabric was heat-set by dry heat at 175°C for 0.5 minutes to produce a cationic dyeable polyester fiber substrate.

[0088] (2) Chemical treatment process using bath processing A treatment solution containing a cationic dye, an ultraviolet absorber, and a dyeing acid was prepared using the following chemicals, with the mass ratio of each chemical relative to the mass of the treatment solution being as follows: Cationic dye: Kayacryl Blue BG-ED (manufactured by Nippon Kayaku Co., Ltd.), 0.200% by mass UV absorber: 2-(2'-hydroxy-3'-tert-butyl-5'-methylphenyl)-5-chlorobenzotriazole, 0.100% by mass Dyeing acid: 70% acetic acid / 30% sodium acetate mixed aqueous solution, 0.005% by mass Thereafter, the cationic dyeable polyester fiber substrate was immersed in the treatment solution prepared above and subjected to chemical solution treatment at 120°C for 30 minutes under pressure in a bath processing machine. Thereafter, the cationic dyeable polyester fiber substrate was removed from the bath processing machine and subjected to water washing and dehydration. Here, the following device was used for the bath processing machine, and the bath ratio was as follows. In-bath processing machine: 12-color rotary pot dyeing tester (MINI-COLOUR 12EL type: manufactured by Texam Giken Co., Ltd.) Liquor ratio (mass of cationic dyeable polyester fiber substrate: mass of treatment liquid): 1:10 (3) Chemical treatment process using pad processing A processing solution containing a quinoline-based compound was prepared using the following chemicals, and the mass ratio of the quinoline-based compound to the mass of the processing solution was adjusted as follows: Quinoline compounds: oxolinic acid, 0.012% by mass Thereafter, the cationic dyeable polyester fiber substrate was immersed in the treatment liquid prepared above, and squeezed with a mangle roller so that the treatment liquid adhered to the substrate. Thereafter, the cationic dyeable polyester fiber substrate was set in a pin tenter and subjected to a wet heat treatment at 130°C for 2 minutes.

[0089] (4) Post-heat treatment process The chemically treated cationic dyeable polyester fiber substrate was set in a pin tenter and heat set with dry heat at 170°C for 1 minute to obtain a cationic dyeable polyester fiber structure.

[0090] The cationic dyeable polyester fiber structure obtained through the above process had a color difference ΔE before washing of 4.67 and poor light fastness. 50 The antibacterial activity value (A0-F) was -0.3, and the antibacterial activity after 50 high-temperature accelerated washings was also poor. The color difference ΔE after washing was 4.23, and the lightfastness was poor, but the antibacterial activity value (A0-F) before washing was 2.4, and the antibacterial activity before washing was good.

[0091] [Table 1] [Industrial Applicability]

[0092] The cationic dyeable polyester fiber structure of the present invention has excellent lightfastness and antibacterial properties after washing. Such cationic dyeable polyester fiber structure can be used in various applications requiring lightfastness and high antibacterial properties, such as fabrics for clothing, bedding, towels, rugs, curtains, and sheets, and can also be suitably used for medical uniforms.

Claims

1. A cationic dyeable polyester fiber structure comprising a cationic dye, a quinoline-based compound, and an ultraviolet absorber, The quinoline-based compound is contained in an amount of 0.03% by mass or more and 0.80% by mass or less relative to the mass of the cationic dyeable polyester fiber structure, the color difference ΔE before and after irradiation of the cationic dyeable polyester fiber structure with ultraviolet carbon arc lamp light is 2.0 or less, In addition, in the antibacterial evaluation method described in the SEK Mark textile product certification standards, the antibacterial activity value A after 50 high-temperature accelerated washings ５０ is greater than the standard fabric growth value F, Cationic dyeable polyester fiber structure.

2. 2. The cationic dyeable polyester fiber structure according to claim 1, wherein the quinoline-based compound is at least one compound selected from the group consisting of oxolinic acid, ciprofloxacin, levofloxacin, moxifloxacin, difluoromethoxygarenoxacin, and sitafloxacin.

3. 2. The cationic dyeable polyester fiber structure according to claim 1, wherein the quinoline-based compound is oxolinic acid.

4. The cationic dyeable polyester fiber structure according to claim 1 or 2, wherein the ultraviolet absorber is a benzotriazole-based compound.

5. The cationic dyeable polyester fiber structure according to claim 4 , wherein the benzotriazole-based compound is contained in an amount of 0.25% by mass or more and 2.00% by mass or less relative to the mass of the cationic dyeable polyester fiber structure.

6. A medical uniform comprising the cationic dyeable polyester fiber structure according to claim 1 or 2.

7. a processing solution preparation step of preparing a processing solution containing a cationic dye, a quinoline-based compound, and an ultraviolet absorber; a chemical solution treatment step in which a fiber substrate containing cationic dyeable polyester fiber is immersed in the treatment solution and heat-treated in a bath at a temperature of 110°C or higher and 140°C or lower under pressure; a post-heat treatment step of performing dry heat treatment at an atmospheric temperature of 150°C or higher and 190°C or lower; A method for producing a cationic dyeable polyester fiber structure, comprising: The cationic dye, the quinoline-based compound, and the ultraviolet absorber are included, The quinoline-based compound is contained in an amount of 0.03% by mass or more and 0.80% by mass or less relative to the mass of the cationic dyeable polyester fiber structure, the color difference ΔE before and after irradiation of the cationic dyeable polyester fiber structure with ultraviolet carbon arc lamp light is 2.0 or less, In addition, in the antibacterial evaluation method described in the SEK Mark textile product certification standards, the antibacterial activity value A after 50 high-temperature accelerated washings ５０ is greater than the standard fabric growth value F, A method for producing a cationic dyeable polyester fiber structure.

8. The method for producing a cation-dyeable polyester fiber structure according to claim 7 , wherein the treatment liquid preparation step uses a treatment liquid containing the quinoline compound in an amount of 0.003 mass % or more and 0.080 mass % or less relative to the mass of the treatment liquid.

9. The method for producing a cationic dyeable polyester fiber structure according to claim 7 or 8, wherein the ultraviolet absorber is a benzotriazole-based compound.

10. The method for producing a cation-dyeable polyester fiber structure according to claim 9, wherein the treatment liquid preparation step uses a treatment liquid containing the benzotriazole compound in an amount of 0.025 mass % or more and 0.200 mass % or less relative to the mass of the treatment liquid.

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