Fiber structure, and method for manufacturing the same, and wear for healthcare and nursing care workers

Abstract

To provide a fiber structure suitable for a wear for healthcare and nursing care workers in which inferior light resistance and heat resistance which are intrinsic to cationic dyeable polyester fiber dyed with a cationic dye are simultaneously overcome, and a method for manufacturing the fiber structure.SOLUTION: A fiber structure containing cationic dyeable polyester fiber dyed with a cationic dye contains a benzotriazole-based compound by 0.50 mass% to 3.50 mass% based on the mass of the fiber structure, and contains a zinc pyrithione-based compound by 0.05 mass% to 0.20 mass% based on the mass of the fiber structure.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a textile structure, a method for producing the same, and clothing for medical care workers. [Background technology]

[0002] Techniques for improving the light resistance of dyed fiber structures have been studied. Methods proposed for imparting light resistance to fibers include a method using an ultraviolet absorber (Patent Document 1) and a method using an ultraviolet absorber and a light stabilizer such as a hindered amine light stabilizer (Patent Document 2). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2009-235606 [Patent Document 2] Japanese Patent Application Laid-Open No. 2015-148038 Summary of the Invention [Problem to be solved by the invention]

[0004] In recent years, medical professionals' uniforms have become more colorful than traditional white coats due to issues such as white coat hypertension, color afterimages, and diversifying values. Polyester fiber garments are more durable than cotton and other materials, and are widely used for medical uniforms that are used repeatedly over long periods of time. Polyester fibers are typically dyed with disperse dyes, but disperse dyes have a low molecular extinction coefficient and lack color development, resulting in low saturation and dull colors.

[0005] Therefore, in recent years, garments containing cationic dyeable polyester fibers dyed with cationic dyes have been developed. Compared to polyester fibers dyed with disperse dyes, these garments have excellent color development and washing fastness in warm or hot water, and as a result, their production volume is increasing year by year. However, a drawback of textile structures made of cationic dyeable polyester fibers dyed with cationic dyes is that they are less likely to achieve both light resistance and heat resistance compared to textile structures made of polyester fibers dyed with conventional disperse dyes. Therefore, when textile structures made of cationic dyeable polyester fibers dyed with cationic dyes are dried in the sun after home washing, they may suffer from light discoloration. Furthermore, when drying in a dryer after industrial washing, the drying temperature may be as high as 150°C or higher, and repeated industrial washing may result in heat discoloration.

[0006] In the methods disclosed in Patent Documents 1 and 2, the light resistance of dyed fiber structures is improved by using an ultraviolet absorber and, in addition, a light stabilizer such as a hindered amine-based light stabilizer and an organic nickel complex in combination, but the heat resistance cannot be improved. Furthermore, even if the techniques disclosed in Patent Documents 1 and 2 are simply applied as they are to a fiber substrate made of a cationic dyeable polyester fiber dyed with a cationic dye, it is not possible to simultaneously improve the light resistance and heat resistance of the fiber structure.

[0007] Furthermore, when the amount of ultraviolet absorber attached to the fiber structure increases, while the light resistance improves, there is the problem that the color saturation of the fiber structure decreases.Furthermore, since the ultraviolet absorber sublimes during the high-temperature finishing process when manufacturing the fiber structure, the effect of improving light resistance relative to the amount of ultraviolet absorber added decreases, i.e., there is also the problem that the utilization efficiency of the ultraviolet absorber decreases.

[0008] As described above, at present, no technology has been found that can simultaneously overcome the poor light resistance and heat resistance inherent to fiber structures made of cationic dyeable polyester fibers dyed with cationic dyes.

[0009] Therefore, an object of the present invention is to provide a fiber structure containing a cationic dyeable polyester fiber dyed with a cationic dye, which has excellent light resistance and heat resistance, and a method for producing the same. [Means for solving the problem]

[0010]

[0003] As a result of extensive research to achieve the above object, the present inventors have found that, in a cationic dyeable polyester fiber structure dyed with a cationic dye, the inclusion of specific chemicals, a benzotriazole-based compound and a zinc pyrithione-based compound, in specific amounts, produces a distinct effect of improving not only the lightfastness but also the heat resistance of the fiber structure. Furthermore, the present inventors have discovered that, by applying specific concentrations of a benzotriazole-based compound and a zinc pyrithione-based compound to a fiber substrate, the lightfastness and heat resistance of a fiber structure containing a cationic dyeable polyester fiber can be improved at a low UV absorber concentration that does not significantly affect the problem of sublimation.

[0011] The object of the present invention is achieved by the following means: (1) A fiber structure containing a cationic dyeable polyester fiber dyed with a cationic dye, the fiber structure containing a benzotriazole-based compound in an amount of 0.50% by mass to 3.50% by mass relative to the mass of the fiber structure and a zinc pyrithione-based compound in an amount of 0.05% by mass to 0.20% by mass relative to the mass of the fiber structure; (2) The fiber structure according to (1), wherein the cationic dye is a blue cationic dye. (3) Wear for medical and nursing staff, comprising the fiber structure according to (1) or (2). (4) A method for producing a fiber structure comprising a cationic dyeable polyester fiber dyed with a cationic dye, the fiber structure containing a benzotriazole-based compound in an amount of 0.50 mass% to 3.50 mass% relative to the mass of the fiber structure and a zinc pyrithione-based compound in an amount of 0.05 mass% to 0.20 mass% relative to the mass of the fiber structure, A textile substrate containing cationic dyeable polyester fiber is subjected to a bath treatment using a treatment liquid containing a cationic dye and a benzotriazole-based compound at a solid content concentration of 0.50 mass% to 4.30 mass% relative to the mass of the textile substrate, and the treated textile substrate is heat-treated by a pad-dry method using a treatment liquid containing a zinc pyrithione-based compound at a solid content concentration of 0.05 mass% to 0.20 mass% relative to the mass of the textile substrate, or A textile substrate containing cationic dyeable polyester fiber is simultaneously treated in a bath with a processing solution containing a cationic dye and a benzotriazole-based compound at a solids concentration of 0.50 mass % to 4.30 mass % relative to the mass of the textile substrate, and a zinc pyrithione-based compound at a solids concentration of 0.05 mass % to 0.20 mass % relative to the mass of the textile substrate. This is a method for producing a fiber structure, which includes a step of supporting a benzotriazole-based compound and a zinc pyrithione-based compound on a fiber substrate. [Effects of the Invention]

[0012] According to the present invention, a fiber structure containing a cationic dyeable polyester fiber dyed with a cationic dye having excellent light resistance and heat resistance can be obtained. In addition, the problem of sublimation of an ultraviolet absorber during high-temperature finishing of the fiber structure can be solved. DETAILED DESCRIPTION OF THE INVENTION

[0013] [Fiber structure] The fiber structure of the present invention comprises a fiber substrate containing cationic dyeable polyester fiber and a processing agent attached to the fiber substrate. Here, the processing agent refers to various chemicals such as benzotriazole-based compounds and zinc pyrithione-based compounds, which will be described later.

[0014] In a fiber substrate containing cationic dyeable polyester fibers, the higher the proportion of cationic dyeable polyester fibers dyed with cationic dyes, the higher the color development of the fiber structure, so the fiber substrate preferably contains 70 mass % or more of cationic dyeable polyester fibers, more preferably 80 mass % or more of cationic dyeable polyester fibers, and may also contain 100 mass % of cationic dyeable polyester fibers.

[0015] The cationic dyeable polyester of the present invention is a copolymerized polyester obtained by copolymerizing polyethylene terephthalate with a compound having a sulfonic acid group, such as sodium dimethyl sulfoisophthalate, and is a modified polyester that can be dyed with a cationic dye. In the present invention, the fiber substrate and fiber structure after dyeing are also referred to as cationic dyeable polyester fiber.

[0016] The fiber structure of the present invention may be a mixed product containing fibers other than cationic dyeable polyester. Examples of the fibers other than cationic dyeable polyester include polyester fibers other than cationic dyeable polyester fibers, and elastic yarns such as cotton, wool, rayon, cupra, nylon fibers, and polyurethane. These may be included in any form, such as blended yarns, mixed yarns, interwoven yarns, or interknitted yarns. Furthermore, the form of the fibers such as cationic dyeable polyester may be either staple fibers or filaments, and is not limited thereto.

[0017] As the fiber substrate of the present invention, those in the form of fabrics such as woven fabrics, knitted fabrics and nonwoven fabrics can be preferably used.

[0018] The fiber structure of the present invention may also contain various additives, such as shape stabilizers, antislip agents, antistatic agents, fixing agents, softeners, antioxidants such as hindered phenols, amines, phosphites, and thioesters, infrared absorbers, organic pigments such as cyanines, stilbenes, phthalocyanines, anthraquinones, verynones, and quinacridones, inorganic pigments, fluorescent brighteners, particles such as calcium carbonate, silica, and titanium oxide, and electrostatic agents.

[0019] [Benzotriazole compounds] The fiber structure of the present invention contains a benzotriazole-based compound. Benzotriazole-based compounds have ultraviolet absorption capabilities and high light absorptance in the ultraviolet wavelength range of 380 nm to 400 nm. Therefore, compared with other ultraviolet absorbers, such as triazine-based and benzophenone-based ultraviolet absorbers, they can more efficiently absorb ultraviolet light from a carbon arc tester or sunlight. Furthermore, although the detailed mechanism is unknown, fiber structures containing benzotriazole-based compounds are inhibited from thermal discoloration during high-temperature drying, thereby improving heat resistance in addition to light resistance, which is the inherent function of ultraviolet absorbers.

[0020] The amount of the benzotriazole compound attached is 0.50% to 3.50% by mass relative to the mass of the fiber structure. If the amount of the benzotriazole compound attached is less than 0.50% by mass, sufficient lightfastness and heat resistance cannot be obtained. On the other hand, if the amount of the benzotriazole compound attached is more than 3.50% by mass, although excellent lightfastness and heat resistance are obtained, the benzotriazole compound sublimes during pad-dry processing, reducing the utilization efficiency of the benzotriazole compound. Furthermore, as the amount of the benzotriazole compound attached increases, the saturation of the fiber structure decreases and the hue becomes dull, preventing the color development characteristic of cationic dyes from being obtained. A benzotriazole compound attachment amount in the range of 0.50% to 1.50% by mass relative to the mass of the fiber structure is more preferable because it suppresses the degree of sublimation of the benzotriazole compound while providing sufficient lightfastness and heat resistance.

[0021] The benzotriazole compound used in the present invention can be a known benzotriazole ultraviolet absorber, and examples thereof include 2-(2-hydroxy-5-methylphenyl)benzotriazole, 2-(2-hydroxy-5-methylphenyl)-5-chlorobenzotriazole, 2-(2-hydroxy-5-t-octylphenyl)benzotriazole, 2-(2-hydroxy-5-t-octylphenyl)-5-chlorobenzotriazole, 2-(2-hydroxy-3,5-di-t-butyl ... 2-(2-hydroxy-3-t-butyl-5-methylphenyl)benzotriazole, 2-(2-hydroxy-3-t-butyl-5-methylphenyl)-5-chlorobenzotriazole, 2-(2-hydroxy-3,5-dicumylphenyl)benzotriazole, 2-(2-hydroxy-3,5-dicumylphenyl)-5-chlorobenzotriazole, 2,2'-methylenebis(4-t-octyl-6-benzotriazolylphenol), 2-(2-hydroxy-3 2-[2-hydroxy-3-(2-acryloyloxyethyl)-5-methylphenyl]benzotriazole, 2-[2-hydroxy-3-(2-acryloyloxyethyl)-5-methylphenyl]-5-chlorobenzotriazole, 2-[2-hydroxy-3-(2-methacryloyloxyethyl)-5-t-butylphenyl]benzotriazole, 2-[2-hydroxy-3-(2-methacryloyloxyethyl)-5-t-butylphenyl]benzotriazole, polyethylene glycol esters of 2-[2-hydroxy-3-(2-methacryloyloxyethyl)-5-t-butylphenyl]benzotriazole, 2-[2-hydroxy-3-(2-methacryloyloxyethyl)-5-t-octylphenyl]benzotriazole, 2-[2-hydroxy-3-(2-methacryloyloxyethyl)-5-t-octylphenyl]-5-chlorobenzotriazole, 2-[2-hydroxy-3-(2-methacryloyloxyethyl)-5-t-butylphenyl]benzotriazole, 2-[2-hydroxy-3-(2-methacryloyloxyethyl)-5-t-butylphenyl]-5-chlorobenzotriazole,2-[2-hydroxy-5-(2-methacryloyloxyethyl)phenyl]benzotriazole, 2-[2-hydroxy-5-(2-methacryloyloxyethyl)phenyl]-5-chlorobenzotriazole, 2-[2-hydroxy-3-t-butyl-5-(2-methacryloyloxyethyl)phenyl]benzotriazole, -[2-hydroxy-3-t-butyl-5-(2-methacryloyloxyethyl)phenyl]-5-chlorobenzotriazole, 2-[2-hydroxy-3-t-amyl-5-(2-methacryloyloxyethyl)phenyl]benzotriazole, 2-[2-hydroxy-3-t-amyl-5-(2-methacryloyloxyethyl)phenyl]-5-chlorobenzotriazole, 2-[2-hydroxy-3-t-butyl-5-(3-methacryloyloxypropyl)phenyl]benzotriazole, 2-[2-hydroxy-3-t-butyl-5-(3-methacryloyloxypropyl)phenyl]benzotriazole, Examples of benzotriazole-based ultraviolet absorbers include 2-[2-hydroxy-4-(2-methacryloyloxymethyl)phenyl]benzotriazole, 2-[2-hydroxy-4-(2-methacryloyloxymethyl)phenyl]-5-chlorobenzotriazole, 2-[2-hydroxy-4-(3-methacryloyloxy-2-hydroxypropyl)phenyl]benzotriazole, 2-[2-hydroxy-4-(3-methacryloyloxy-2-hydroxypropyl)phenyl]-5-chlorobenzotriazole, 2-[2-hydroxy-4-(3-methacryloyloxy-2-hydroxypropyl)phenyl]benzotriazole, and 2-[2-hydroxy-4-(3-methacryloyloxypropyl)phenyl]benzotriazole.

[0022] [Zinc pyrithione compounds] The fiber structure of the present invention contains a zinc pyrithione compound. The zinc pyrithione compound used in the present invention can be any known compound commonly used as a zinc pyrithione antibacterial agent. Medical and nursing wear is treated with a special antibacterial finish (SEK Red Label), and the inclusion of a zinc pyrithione compound can impart the high antibacterial properties of the SEK Red Label to the fiber structure. Furthermore, after extensive investigations, the inventors have found that, although the detailed mechanism is unknown, the inclusion of a zinc pyrithione compound in the fiber structure also suppresses thermal discoloration during high-temperature drying, and that the use of a zinc pyrithione compound in combination with a benzotriazole compound significantly improves thermal discoloration.

[0023] The amount of zinc pyrithione compound attached is 0.05% by mass to 0.20% by mass relative to the mass of the fiber structure. If the amount of zinc pyrithione compound attached is less than 0.05% by mass relative to the mass of the fiber structure, sufficient antibacterial properties and heat resistance cannot be obtained, and if it is more than 0.20% by mass relative to the mass of the fiber structure, light resistance decreases. Therefore, it is important that the zinc pyrithione compound is included in an amount of 0.05% by mass to 0.20% by mass relative to the mass of the fiber structure.

[0024] [Cationic dyes] The cationic dyeable polyester fiber used in the present invention is dyed with a cationic dye. The cationic dye may be a known cationic dye that is soluble in water and is used to dye synthetic fibers such as cationic dyeable polyester fibers and acrylic fibers.

[0025] Among these, it is preferable that at least a part of the cationic dyes is a blue cationic dye. Conventionally, when cationic dyeable polyester fibers are dyed blue, the problems of light discoloration when dried in the sun during home laundering and the degree of heat discoloration when dried at high temperatures during industrial laundering have been particularly significant compared to when dyed with colors other than blue (i.e., the fading has been particularly noticeable). However, the present invention achieves the effect of excellent light resistance and heat resistance even in a fiber structure containing cationic dyeable polyester fibers dyed with a blue cationic dye, which has been difficult to achieve in the past.

[0026] The blue cationic dye in the present invention refers to a dye containing a blue basic dye designated "Basic Blue" in the Color Index. For example, it is more preferable to use CDPN Blue BM-ID (Nissei Chemical Co., Ltd., disperse-type cationic dye) or Kayacryl Blue BG-ED (Nippon Kayaku Co., Ltd., disperse-type cationic dye), which have excellent lightfastness and heat resistance.

[0027] [Applications of fiber structures] The medical and nursing wear of the present invention refers to clothing worn by personnel working in medical institutions and similar institutions (hospitals, elderly care facilities, child welfare facilities, midwifery facilities, etc.). Personnel working in such facilities are required to wear highly antibacterial wear, such as the SEK Red Label, to prevent hospital-acquired infections. In recent years, colorful wear has been developed, for example, by changing the color of clothing according to the type of work of facility staff to make it easier for users to identify them, or to accommodate diversifying values. A textile structure containing the cationic dyeable polyester fiber dyed with the cationic dye of the present invention has high light and heat resistance in addition to antibacterial properties, and therefore can suppress discoloration even when dried in the sun during home laundering or at high temperatures during industrial laundering. Therefore, it is suitable for use in apparel and non-apparel applications such as clothing, bedding, sports shirts, school uniforms, nursing wear, white coats, blouses, dress shirts, skirts, slacks, coats, blousons, windbreakers, compression innerwear, the base material for attaching a fan in fan-equipped workwear, gloves, hats, futon covers, futon drying rack covers, curtains, tents, etc. It is particularly preferred for use in scrubs, casey clothes, and other wear for medical and nursing care workers.

[0028] [Manufacturing method] The method for producing a fiber structure of the present invention includes a step of supporting a cationic dye, a benzotriazole-based compound, and a zinc pyrithione-based compound on a fiber substrate containing cationic dyeable polyester fibers.

[0029] Generally, methods for applying various chemicals to textile substrates containing cationic dyeable polyester fibers include bath treatment and pad-dry methods.

[0030] In the present invention, a textile substrate containing cationic dyeable polyester fibers is first subjected to a bath treatment in a treatment solution containing a cationic dye and a benzotriazole-based compound, or a treatment solution containing a cationic dye, a benzotriazole-based compound, and a zinc pyrithione-based compound. The bath treatment described here refers to a method of attaching the finishing agent to the textile substrate by immersing the textile in a bath containing the above-mentioned treatment solution and then heat-treating it, making it a suitable processing method for applying the finishing agent to the textile. In the present invention, bath treatment is preferably performed at a temperature of 120°C to 130°C under pressure for 20 to 30 minutes. Furthermore, since the pad-dry method may result in a reduced amount of benzotriazole-based compounds adhering to the textile due to sublimation, it is more preferable to apply the compound by bath treatment. Furthermore, to maximize the amount of benzotriazole-based compounds adhering to the textile, it is preferable to process the zinc pyrithione-based compound separately. In this case, the zinc pyrithione-based compound is preferably processed by the pad-dry method.

[0031] It is important that the processing concentration of the benzotriazole-based compound is 0.50% by mass to 4.30% by mass in terms of solid content relative to the mass of the fiber substrate. If the processing concentration of the benzotriazole-based compound is less than 0.50% by mass, sufficient light resistance and heat resistance cannot be obtained. On the other hand, if the processing concentration of the benzotriazole-based compound is more than 4.30% by mass, the benzotriazole-based compound will sublimate during high-temperature pad-dry processing, significantly reducing the utilization efficiency of the benzotriazole-based compound. Furthermore, if the amount of the benzotriazole-based compound attached increases, the saturation C of the fiber structure after processing will decrease. * Therefore, the processing concentration should be determined taking into consideration the degree of sublimation of the benzotriazole compound.

[0032] When using a zinc pyrithione compound in a bath for treatment, it is important to set the processing concentration to 0.05 to 0.20% by mass as the solid content concentration relative to the mass of the fiber substrate. If the processing concentration of the zinc pyrithione compound is less than 0.05% by mass, sufficient heat resistance and antibacterial properties cannot be obtained, while if it is more than 0.20% by mass, light resistance decreases.

[0033] If zinc pyrithione compounds are not added in the bath treatment, a processing solution containing zinc pyrithione compounds is applied to the textile substrate using the pad-dry method. The pad-dry method involves immersing the fabric in a bath containing the processing agent, squeezing it with a mangle roller or similar to ensure that a certain amount of the processing agent adheres to the fabric, and then applying a dry heat treatment in a dryer to adhere the processing agent.

[0034] In the pad-dry method, it is important that the processing concentration of the zinc pyrithione compound in the processing solution be 0.05 to 0.20 mass% in terms of solids concentration relative to the mass of the fiber substrate before bath treatment. If the processing concentration of the zinc pyrithione compound is less than 0.05 mass%, sufficient heat resistance and antibacterial properties will not be obtained, while if it is more than 0.20 mass%, light resistance will be reduced.

[0035] In the dry heat treatment process of the pad-dry method, dry heat treatment is performed in a dryer at an ambient temperature of 150°C to 200°C for 30 seconds to 2 minutes. By performing dry heat treatment under these conditions, benzotriazole compounds and zinc pyrithione compounds can be supported on the fiber substrate. If the temperature inside the dryer is too low, drying will be insufficient, and if it is too high, dyes and processing agents may thermally decompose.

[0036] Furthermore, chemicals containing zinc pyrithione compounds are dispersed in water and tend to settle over time, so particulate matter can easily accumulate and become stains on jet dyeing machines, mangle rollers, etc. Since stains inside jet dyeing machines are difficult to remove, from the perspective of production management, it is preferable to apply zinc pyrithione compounds to textile substrates using the pad-dry method.

[0037] Therefore, in the present invention, a textile substrate containing cationic dyeable polyester fiber is subjected to a bath treatment using a processing solution containing a cationic dye and a benzotriazole-based compound at a solid content concentration of 0.50% by mass to 4.30% by mass relative to the mass of the textile substrate, and the processed textile substrate is heat-treated by a pad-dry method using a processing solution containing a zinc pyrithione-based compound at a solid content concentration of 0.05% by mass to 0.20% by mass relative to the mass of the textile substrate; or, a textile substrate containing cationic dyeable polyester fiber is simultaneously bath-treated with processing solutions containing a cationic dye and a benzotriazole-based compound at a solid content concentration of 0.50% by mass to 4.30% by mass relative to the mass of the textile substrate, and a zinc pyrithione-based compound at a solid content concentration of 0.05% by mass to 0.20% by mass relative to the mass of the textile substrate, thereby making it possible to produce a textile structure by supporting the benzotriazole-based compound and the zinc pyrithione-based compound on the textile substrate.

[0038] [Discoloration after heat treatment] The fiber structure of the present invention thus obtained has high heat resistance, achieving grade 4 or higher in discoloration after heat treatment. In the present invention, discoloration after heat treatment indicates the heat resistance of a fiber structure containing a cationic dyeable polyester fiber, as evaluated by the evaluation method described below. The higher the grade of discoloration after heat treatment, the more suppressed discoloration during drum drying after washing or high-temperature drying during industrial washing, and the longer the product can be used.

[0039] [Discoloration after exposure to light] The fiber structure of the present invention also has high light resistance, achieving grade 4 or higher in discoloration before and after light irradiation. In the present invention, discoloration before and after light irradiation indicates the light resistance of a fiber structure containing a cationic dyeable polyester fiber, evaluated by the evaluation method described below. The higher the grade of discoloration before and after light irradiation, the more discoloration due to drying in the sun after home laundering can be suppressed, and the product can be used repeatedly for a long period of time. [Example]

[0040] [Evaluation method] (Discoloration assessment) The discoloration of the fiber structure before and after heat treatment and before and after light irradiation was judged by further subdividing the gray scale for discoloration specified in JIS L0804:2004 "Gray scale for discoloration" into the following series. Here, in the following series order, the later the series, the better the fastness. (Order of grade) 1,1+,2-,2,2+,2-3-,2-3,2-3+,3-,3,3+,3-4-,3-4,3-4+,4-,4,4+,4-5-,4-5,4-5+,5-,5

[0041] (Determination of heat resistance) The heat resistance of the fiber structures was tested using the following procedure and conditions. Two 4cm x 2cm fiber structures were prepared, and one of them was placed on a flat tray. It was dry-heat treated under the conditions below, and then the fabric was removed with tweezers and left to stand at room temperature for one day. The change in hue between the fiber structures that had not been dry-heat treated and those that had been dry-heat treated was assessed for thermal discoloration using the discoloration assessment method described above. (conditions) Equipment: Baking dryer (DKN-602 model / Yamato Scientific Co., Ltd.) Temperature: 160℃ Duration: 2 hours Humidity: 20%RH~80%RH

[0042] (light irradiation) The light resistance of the fiber structure was tested using the following procedure and conditions. A 7.5cm x 7cm fiber structure was prepared and irradiated according to the fourth exposure method of JIS L0842:2021, "Test method for color fastness to ultraviolet carbon arc lamp light." The irradiated area was then removed with tweezers without touching it, and left to stand in a dark place for one day. The color difference between the irradiated and unirradiated areas was then confirmed using the discoloration assessment method described above. (conditions) Equipment: UV fade meter (UVAFM U48AU / Suga Test Instruments)

[0043] (Saturation of fiber structure C * ) Chroma C of the present invention * L * a * b* It is the saturation in the color space of the colorimetric system, measured under the following conditions: * and b * saturation C is calculated using formula (1) (rounded to the third decimal place). * The larger the value, the more vivid the color, and the smaller the value, the duller the color. (conditions) Equipment: Spectrophotometer (CM-3700 model / Konica Minolta, Inc.) Reflective: SCE Measuring diameter: 25.4 mm UV: 100% FULL Light source: D65 Field of view: 10° C * =[((a * ) 2 +(b * ) 2 ) 0.5 ]…(1).

[0044] (Pickup rate) The pickup rate is the ratio of the mass of the processed fabric before immersion in the processing liquid to the mass of the fabric after immersion in the processing liquid and squeezing, and is expressed by the following formula (2) (rounded to the first decimal place): Pickup rate (%) = [(mass of processed fabric after soaking and squeezing (g) - mass of processed fabric before soaking (g)) / mass of processed fabric before soaking (g)] × 100... (2).

[0045] (Amount of processing agent applied in each process) Bath treatment In the bath treatment, the amount of processing agent adhered to the fiber was measured using the following method. Before bath treatment, the fabric was left to stand in a desiccator containing silica gel as a desiccant for 20 minutes, and after cooling, the mass of the fabric was immediately measured using a precision balance. The mass of the same fabric after bath treatment was also measured using the same method, and the amount of adhesion was measured (rounded to three decimal places). Adhesion amount in bath treatment (g) = [(mass of fabric after bath treatment (g) - mass of fabric before bath treatment (g))] ... (3)

[0046] When two or more types of processing agents were used in combination, the adhesion amount was measured when each processing agent was used alone under the same conditions, and was considered as the adhesion amount for each processing agent. It was confirmed that this value was consistent with the measurement results of the total adhesion amount when two or more types of processing agents were used in combination.

[0047] Pad-dry method Based on the pickup rate measured by equation (2), the amount of adhesion to the fabric after processing by the pad-dry method was calculated using equation (4) (rounded to two decimal places). This pad method was performed using the mangle roller used in equation (2), with the same mangle pressure and rotation speed conditions. Pad-dry method adhesion amount (%) = (pickup rate (%) / 100) × concentration of processing agent (g / L) / 10…(4)

[0048] Furthermore, it was confirmed that the above calculation results are consistent with the measurement results of the mass change before and after processing of a processing liquid containing zinc pyrithione-based compounds using the pad-dry method (i.e., it means that the compound is essentially completely absorbed and adheres to the fiber substrate).

[0049] In the bath treatment and pad-dry method, if any of the dyes, benzotriazole compounds, or zinc pyrithione compounds had already adhered to the fabric before each treatment, the amounts of these compounds were subtracted from the calculations, and the amounts were corrected to reflect the amounts relative to the fiber substrate.

[0050] Amount of benzotriazole-based compounds attached to fiber structures Benzotriazole compounds are prone to sublimation during high-temperature processing using the pad-dry method following bath treatment.

[0051] Therefore, the amount of benzotriazole compound attached (g) after bath treatment was first calculated using the above formula (3). Next, the change in mass of the fabric before and after the pad-dry method was calculated using the following formula (5) (rounded to the third decimal place). The mass of the fabric after bath treatment was measured by leaving it in a desiccator containing silica gel as a desiccant for 20 minutes, allowing it to cool, and then immediately measuring the mass of the fabric using a precision balance. The mass of the fabric after the pad-dry method was also measured using the same method. Change in mass of fabric before and after pad-drying (g) = [mass of fabric after pad-drying (g) - mass of fabric after bath treatment (g)]...(5)

[0052] The amount of benzotriazole-based compounds sublimated by the pad-dry method was calculated by subtracting the amount of zinc pyrithione-based compounds deposited by the pad-dry method as shown in equation (6) (rounded to two decimal places). Sublimated benzotriazole compound (g) = [change in mass of fabric before and after pad-drying (g) - amount of zinc pyrithione compound attached (g)]...(6)

[0053] Finally, the amount of the benzotriazole compound attached to the fiber structure was calculated using formula (7) (rounded to two decimal places). Amount of benzotriazole-based compound attached to the fiber structure (%) = [(amount of benzotriazole-based compound attached after bath treatment (g) - sublimated benzotriazole-based compound (g)) / mass of fabric before bath treatment (g)] × 100... (7)

[0054] Amount of zinc pyrithione compounds attached to fiber structures Since zinc pyrithione compounds are substantially completely absorbed as described above, the amount was calculated using the above formula (4) (rounded to two decimal places).

[0055] Residual level of benzotriazole compounds The residual degree was calculated using the adhesion amount of the benzotriazole-based compound treated in the bath and the adhesion amount of the benzotriazole-based compound on the fiber structure according to the following formula (8) (rounded to the first decimal place). Residual degree (%) = [adhesion amount (g) of benzotriazole-based compound on fiber structure / adhesion amount (g) of benzotriazole-based compound treated in bath] × 100 (8)

[0056] As a result of repeated experiments, it was found that white smoke is generated as the benzotriazole compound sublimes, and if the residual level is 80% or more, only a small amount of white smoke is generated, but if it is less than 80%, a large amount of white smoke is generated that can be seen with the naked eye. Furthermore, if the residual level decreases due to the sublimation of benzotriazole, this means that the use efficiency of the benzotriazole compound decreases. Based on these facts, the residual level was determined based on the following definition. ◯: Residual degree = 100%, △: 80% < residual degree < 100%, ×: residual degree ≦ 80%... (7)

[0057] [Example 1] A processing solution was prepared using water as the solvent, containing CDPN BLUE BM-ID (Nissei Chemical Co., Ltd., dispersible cationic dye) at 2% owf, TO-SR-1R (Takamatsu Oil & Fat Co., Ltd., aqueous dispersion of modified polyester resin) at 1.5% owf, pH adjuster (acetic acid-sodium acetate buffer solution, pH 4.0) at 0.5 g / L, and LPX-80 (Nicca Chemical Co., Ltd., benzotriazole-based UV absorber, solids content 50%) at 1% owf (0.50% by mass of benzotriazole-based compound solids relative to the mass of the fiber substrate).

[0058] A cationic dyeable polyester knitted fabric was prepared as a fiber substrate, knitted with 95% by mass of cationic dyeable polyester fiber consisting of multifilament with a fineness of 84 dtex-36 filaments (84T-36F) and 5% by mass of nylon fiber with a fineness of 78T-52F. Here, the cationic dyeable polyester fiber used was a cationic dyeable polyester with a polyethylene terephthalate skeleton.

[0059] The above-mentioned fiber substrate was immersed in the above-prepared processing solution, sealed, and then treated in the bath at 120°C for 20 minutes. After that, it was rinsed with running water for 1 minute, dried, and then subjected to the following pad-dry method.

[0060] Next, the dried fabric was immersed in a processing solution containing MR-T100 (Osaka Chemical Industry Co., Ltd., zinc pyrithione antibacterial agent, solid content 19%) at 4.8 g / L (0.10 mass% solid content of zinc pyrithione compound relative to the mass of the fiber substrate) in a water solvent, and after squeezing to a pickup rate of 105%, heat treatment at 190°C for 1 minute was performed to obtain a fiber structure. The measurement results of the fiber structure obtained in Example 1 are shown in Table 1.

[0061] [Example 2] A fiber structure was obtained in the same manner as in Example 1, except that in the formulation of the processing solution for the bath treatment, LPX-80 was changed to 2% owf (1.00 mass% in terms of the solid content concentration of the benzotriazole-based compound relative to the mass of the fiber substrate). The measurement results of the fiber structure obtained in Example 2 are shown in Table 1.

[0062] [Example 3] A fiber structure was obtained in the same manner as in Example 1, except that in the formulation of the processing solution for the bath treatment, LPX-80 was changed to 3% owf (1.50 mass% in terms of the solid content concentration of the benzotriazole-based compound relative to the mass of the fiber substrate). The measurement results of the fiber structure obtained in Example 3 are shown in Table 1.

[0063] [Example 4] A fiber structure was obtained in the same manner as in Example 1, except that in the formulation of the processing solution for the bath treatment, LPX-80 was changed to 5% owf (2.50 mass% in terms of the solid content concentration of the benzotriazole-based compound relative to the mass of the fiber substrate). The measurement results of the fiber structure obtained in Example 4 are shown in Table 1.

[0064] [Example 5] A fiber structure was obtained in the same manner as in Example 1, except that in the formulation of the processing solution for the bath treatment, LPX-80 was changed to 8.6% owf (4.30 mass% in terms of the solid content concentration of the benzotriazole-based compound relative to the mass of the fiber substrate). The measurement results of the fiber structure obtained in Example 5 are shown in Table 1.

[0065] [Example 6] In Example 2, the formulation of the processing solution for the pad-dry method contained MR-T100 at 2.9 g / L (0.06 mass% solids concentration of zinc pyrithione-based compound relative to the mass of the fiber substrate), and the processing was carried out by the pad-dry method in the same manner as in Example 2 to obtain a fiber structure. The measurement results of the fiber structure obtained in Example 6 are shown in Table 1.

[0066] [Example 7] In Example 2, the formulation of the processing solution for the pad-dry method contained MR-T100 at 9.6 g / L (0.19 mass% solids concentration of zinc pyrithione-based compound relative to the mass of the fiber substrate), and the processing was carried out by the pad-dry method in the same manner as in Example 2 to obtain a fiber structure. The measurement results of the fiber structure obtained in Example 7 are shown in Table 1.

[0067] [Example 8] In Example 2, 0.5% owf of MR-T100 (0.10 mass% solids concentration of zinc pyrithione-based compounds relative to the mass of the fiber substrate) was further added to the processing solution for the bath treatment, and the bath treatment was carried out under the same conditions as in Example 2. Thereafter, the fiber structure was obtained by rinsing with running water under the same conditions as in Example 2 (without processing by the pad-dry method). The measurement results of the fiber structure obtained in Example 8 are shown in Table 1.

[0068] [Table 1]

[0069] [Comparative Example 1] In Example 1, bath treatment was carried out under the same conditions as in Example 1, except that LPX-80 was not added to the formulation of the processing solution for bath treatment. Thereafter, rinsing with running water was carried out under the same conditions as in Example 1 to obtain a fiber structure (without processing by the pad-dry method). The measurement results of the fiber structure obtained in Comparative Example 1 are shown in Table 2.

[0070] Comparative Example 2 After bath treatment under the same conditions as in Example 2, a fiber structure was obtained by rinsing with running water under the same conditions as in Example 2 (without pad-dry processing). The measurement results of the fiber structure obtained in Comparative Example 2 are shown in Table 2.

[0071] Comparative Example 3 A fiber structure was obtained in the same manner as in Example 1, except that LPX-80 was not added to the formulation of the processing solution for the bath treatment in Example 1. The measurement results of the fiber structure obtained in Comparative Example 3 are shown in Table 2.

[0072] Comparative Example 4 In Example 1, in the formulation of the processing solution for the bath treatment, CHIGUARD 5400WB (Kusumoto Chemicals Co., Ltd., triazine-based ultraviolet absorber, solids content 30%); 3.3% owf (solids content concentration of benzotriazole-based compound relative to the mass of the fiber substrate: 1.00 mass%) was used instead of LPX-80, and the bath treatment was carried out under the same conditions as in Example 1. Thereafter, the fiber structure was obtained by rinsing with running water under the same conditions as in Example 1 (no pad-dry processing). The measurement results of the fiber structure obtained in Comparative Example 4 are shown in Table 2.

[0073] Comparative Example 5 In Comparative Example 3, a fiber structure was obtained in the same manner as in Comparative Example 3, except that in the formulation of the processing liquid for the pad-dry method, MR-T100 was replaced with "Amorden" (registered trademark) D4C (Yamato Chemical Industry Co., Ltd., organic carboxylic acid antibacterial agent, solid content 15%); 6.7 g / L (0.11 mass% solid content concentration of organic carboxylic acid compound relative to the mass of the fiber substrate) was used for processing by the pad-dry method. The measurement results of the fiber structure obtained in Comparative Example 5 are shown in Table 2.

[0074] [Table 2]

[0075] Comparative Example 6 A fiber structure was obtained in the same manner as in Example 2, except that in the formulation of the processing liquid for the pad-dry method, MR-T100 was replaced with "Amorden" (registered trademark) D4C (Yamato Chemical Industry Co., Ltd., organic carboxylic acid antibacterial agent, solid content 15%); 6.7 g / L (0.11 mass% solid content concentration of organic carboxylic acid compound relative to the mass of the fiber substrate) was used for processing by the pad-dry method. The measurement results of the fiber structure obtained in Comparative Example 6 are shown in Table 3.

[0076] Comparative Example 7 A fiber structure was obtained in the same manner as in Example 1, except that in the formulation of the processing liquid for the bath treatment in Example 1, CHIGUARD 5400WB (Kusumoto Chemicals Co., Ltd., triazine-based ultraviolet absorber, solid content 30%); 3.3% owf (solid content concentration of benzotriazole-based compound relative to the mass of the fiber substrate is 1.00 mass%) was used for the bath treatment instead of LPX-80. The measurement results of the fiber structure obtained in Comparative Example 7 are shown in Table 3.

[0077] [Comparative Example 8] In Comparative Example 7, a fiber structure was obtained in the same manner as in Comparative Example 7, except that in the formulation of the processing liquid for the pad-dry method, MR-T100 was replaced with "Amorden" (registered trademark) D4C (Yamato Chemical Industry Co., Ltd., organic carboxylic acid antibacterial agent, solid content 15%); 6.7 g / L (solid content concentration of organic carboxylic acid compound relative to the mass of the fiber substrate: 0.11 mass%). The measurement results of the fiber structure obtained in Comparative Example 8 are shown in Table 3.

[0078] Comparative Example 9 A fiber structure was obtained in the same manner as in Example 1, except that in the formulation of the processing solution for the bath treatment, LPX-80 was changed to 0.5% owf (0.25% by mass in terms of the solid content concentration of the benzotriazole-based compound relative to the mass of the fiber substrate). The measurement results of the fiber structure obtained in Comparative Example 9 are shown in Table 3.

[0079] [Comparative Example 10] A fiber structure was obtained in the same manner as in Example 1, except that in the formulation of the processing solution for the bath treatment, LPX-80 was changed to 10% owf (5.00 mass% in terms of solid content concentration of the benzotriazole-based compound relative to the mass of the fiber substrate). The measurement results of the fiber structure obtained in Comparative Example 10 are shown in Table 3.

[0080] [Comparative Example 11] A fiber structure was obtained in the same manner as in Example 2, except that the formulation of the processing liquid in the pad-dry method was changed to 1 g / L of MR-T100 (0.02 mass% in terms of the solid content concentration of the zinc pyrithione-based compound relative to the mass of the fiber substrate). The measurement results of the fiber structure obtained in Comparative Example 11 are shown in Table 3.

[0081] [Comparative Example 12] A fiber structure was obtained in the same manner as in Example 2, except that the formulation of the processing liquid in the pad-dry method was changed to 12 g / L of MR-T100 (0.24 mass% in terms of the solid content of the zinc pyrithione compound relative to the mass of the fiber substrate). The measurement results of the fiber structure obtained in Comparative Example 12 are shown in Table 3.

[0082] [Table 3]

Claims

1. A fiber structure containing a cationic dyeable polyester fiber dyed with a cationic dye, the fiber structure containing a benzotriazole-based compound in an amount of 0.50% by mass to 3.50% by mass relative to the mass of the fiber structure, and a zinc pyrithione-based compound in an amount of 0.05% by mass to 0.20% by mass relative to the mass of the fiber structure.

2. The fibrous structure according to claim 1, wherein the cationic dye is a blue cationic dye.

3. A garment for medical and nursing staff, comprising the fiber structure according to claim 1 or 2.

4. A method for producing a fiber structure comprising a cationic dyeable polyester fiber dyed with a cationic dye, the fiber structure containing a benzotriazole-based compound in an amount of 0.50 mass % to 3.50 mass % relative to the mass of the fiber structure, and a zinc pyrithione-based compound in an amount of 0.05 mass % to 0.20 mass % relative to the mass of the fiber structure, A fiber substrate containing a cationic dyeable polyester fiber is subjected to a bath treatment using a treatment liquid containing a cationic dye and a benzotriazole-based compound at a solid content concentration of 0.50 mass% to 4.30 mass% relative to the mass of the fiber substrate, and the processed fiber substrate is heat-treated by a pad-dry method using a treatment liquid containing a zinc pyrithione-based compound at a solid content concentration of 0.05 mass% to 0.20 mass% relative to the mass of the fiber substrate, or A fiber substrate containing cationic dyeable polyester fiber is simultaneously treated in a bath with a processing solution containing a cationic dye and a benzotriazole-based compound at a solid content concentration of 0.50% by mass to 4.30% by mass relative to the mass of the fiber substrate, and a zinc pyrithione-based compound at a solid content concentration of 0.05% by mass to 0.20% by mass relative to the mass of the fiber substrate. The method for producing a fiber structure includes a step of supporting a benzotriazole-based compound and a zinc pyrithione-based compound on a fiber substrate by the above-mentioned method.

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