Method for producing deodorant antibacterial fiber structure, and deodorant antibacterial fiber structure
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- OSAKA KASEI
- Filing Date
- 2026-01-19
- Publication Date
- 2026-07-30
Smart Images
Figure JP2026001496_30072026_PF_FP_ABST
Abstract
Description
Method for manufacturing deodorizing and antibacterial fiber structures and deodorizing and antibacterial fiber structures
[0001] The present invention relates to a method for manufacturing a deodorizing and antibacterial fiber structure and to a deodorizing and antibacterial fiber structure, and more specifically, to a method for manufacturing a deodorizing and antibacterial fiber structure that is excellent in washing durability and deodorizing of sweat odor, and has antibacterial properties, and to a deodorizing and antibacterial fiber structure.
[0002] Conventionally, when imparting deodorizing properties to fibrous structures, the use of metal oxides or metal salts has been considered essential, and the use of phosphate compounds or organic acids for stabilization and pH adjustment of these materials is widely known (for example, Patent Documents 1-3).
[0003] In other words, when organic acids or phosphate compounds are not simply used as sprays but are fixed to fibrous structures, etc., it is common practice to react with or support them with monomers, polymers, or metals to enhance heat resistance and stability. However, reacting them with monomers, metals, etc. in this way can block the reactive groups necessary for deodorization, potentially leading to a significant decrease or inactivation of the deodorizing effect. Furthermore, since titanium dioxide and alumina silicates are insoluble substances, incorporating them in large quantities to improve wash durability may cause whitening or white spots on the fibers.
[0004] On the other hand, some products use organic acids or phosphate compounds as deodorizing components, rather than for stabilization or pH adjustment. However, it is difficult to fix these directly to the fiber structure, so they are used, for example, as spray disinfectants for kitchens and bathrooms, as described in Patent Document 4. Therefore, when using organic acids or phosphate compounds as deodorizing components in a fiber structure, it is necessary to fix them to the fiber structure with a resin binder or to knead them into the fiber itself. However, while those fixed to the fiber structure with a resin binder have excellent deodorizing properties, they negatively affect the texture, which is important for clothing. Furthermore, their wash durability is not sufficient; for example, after more than 10 washes, the desired deodorizing properties are no longer obtained. Also, when kneaded into the fiber itself, most of the deodorizing components are encapsulated within the fiber and do not bleed to the fiber surface, resulting in insufficient deodorizing properties.
[0005] In recent years, there has been a growing demand for safety in sportswear, clothing, bedding, and other similar products, as well as a growing emphasis on the image consumers perceive. From these perspectives, there is a need for deodorizing agents for textiles to use deodorizing components that are both highly safe and create a positive consumer image. However, achieving safe and durable deodorization, particularly for sweat odor, is not easy, and currently, no product exists that meets these requirements.
[0006] In other words, body odor consists of both alkaline odors (e.g., odors caused by ammonia) and acidic odors (e.g., odors caused by acetic acid and isovaleric acid). However, when deodorizing components that address alkaline odors are mixed with deodorizing components that address acidic odors, the deodorizing properties of each component are deactivated, making it difficult to eliminate both alkaline and acidic odors simultaneously.
[0007] Japanese Patent Publication No. 2008-259804, International Publication No. 2014 / 119346, Japanese Patent Publication No. Hei 02-157040, Japanese Patent Publication No. 2019-182833
[0008] Against this backdrop, the present invention provides a deodorizing and antibacterial fiber structure and a method for producing the same that can effectively eliminate complex odors such as sweat odor, has high wash durability and safety, possesses antibacterial properties, is environmentally friendly using naturally occurring substances, and has a positive image for consumers.
[0009] In light of these circumstances, the inventors conducted extensive research and found that a deodorizing and antibacterial fiber structure obtained by applying a treatment liquid containing specific components to a fiber structure and then heat-treating it under specific conditions can effectively deodorize sweat odor, has high wash durability and safety, possesses antibacterial properties, and is a deodorizing and antibacterial fiber structure that has a positive image among consumers.
[0010] In other words, the present invention has the following embodiments: [1] A method for producing a deodorizing and antibacterial fiber structure, comprising heating a fibrous structure having cellulose fibers at a temperature exceeding 100°C and not exceeding 200°C for 0.5 minutes or more under normal pressure or under pressurized conditions while the fibrous structure having cellulose fibers is in contact with a treatment liquid, wherein the treatment liquid comprises a polycarboxylic acid and a phosphoric acid compound and / or a salt thereof. [2] The method for producing a deodorizing and antibacterial fiber structure according to [1], wherein the mass ratio of the phosphoric acid compound and / or a salt thereof to the polycarboxylic acid in the treatment liquid ("phosphoric acid compound and / or a salt thereof" / "polycarboxylic acid") is set to 0.01 to 100. [3] A fibrous structure having cellulose fibers containing 0.1 to 10 g / m of polycarboxylic acid. ２ It is immobilized and contains 0.1 to 10 g / m of phosphate compounds and / or their salts. ２ A fixed deodorizing and antibacterial fiber structure wherein the deodorizing rate of ammonia, acetic acid, and isovaleric acid after 10 washes at 40°C (in accordance with JIS L0217-103) is 30% or more each. [4] A deodorizing and antibacterial fiber structure obtained by bringing a treatment liquid having a polycarboxylic acid and a phosphoric acid compound and / or a salt thereof into contact with a fiber structure having cellulose fibers and performing a heat treatment at a temperature exceeding 100°C and not exceeding 200°C for 0.5 minutes or more under normal pressure or under pressure, wherein the deodorizing and antibacterial fiber structure wherein the deodorizing and antibacterial fiber structure wherein the deodorizing rate of ammonia, acetic acid, and isovaleric acid after 10 washes at 40°C (in accordance with JIS L0217-103) is 30% or more each.
[0011] The present invention provides a method for producing a deodorizing and antibacterial fiber structure, in which a treatment liquid is brought into contact with a fiber structure having cellulose fibers, and a heat treatment is performed at atmospheric pressure or under pressurized conditions at a temperature exceeding 100°C and not exceeding 200°C for 0.5 minutes or more. Because the treatment liquid contains a polycarboxylic acid and a phosphoric acid compound and / or a salt thereof, the components contained in the treatment liquid can be fixed to the surface of the fiber structure, resulting in a deodorizing and antibacterial fiber structure that can sufficiently deodorize sweat odor, has high wash durability for deodorizing and antibacterial properties, and is also safe, thus creating a product that is well-received by consumers.
[0012] This figure illustrates an example of a method in which a processing liquid is brought into contact with a fibrous structure and heated, according to one embodiment of the present invention.
[0013] The present invention will be described below based on examples of embodiments for carrying out the present invention. However, the present invention is not limited to the embodiments described below.
[0014] In this specification, "x and / or y (where x and y are any combination)" means at least one of x and y, and can mean x only, y only, or x and y. In this specification, when "X to Y" (where X and Y are any numbers) is expressed, unless otherwise specified, it includes the meaning of "greater than or equal to X and less than or equal to Y," as well as "preferably greater than X" or "preferably less than Y." In this specification, when "greater than or equal to X" (where X is any number) or "less than or equal to Y" (where Y is any number) is expressed, it also includes the meaning of "preferably greater than X" or "preferably less than Y." In this specification, for numerical ranges described in stages, the upper or lower limit of a numerical range in one stage can be arbitrarily combined with the upper or lower limit of a numerical range in another stage. Furthermore, in numerical ranges described in this specification, the upper or lower limit of that numerical range can be replaced with the values shown in the examples.
[0015] The method for producing a deodorizing and antibacterial fiber structure according to this embodiment is a method for producing a deodorizing and antibacterial fiber structure by bringing a treatment liquid and a fiber structure having cellulose fibers into contact and performing a heat treatment at atmospheric pressure or under pressurized conditions at a temperature above 100°C and below 200°C for 0.5 minutes or more, wherein the treatment liquid contains a polycarboxylic acid (A) and a phosphoric acid compound and / or its salt (B).
[0016] The method for manufacturing the deodorizing and antibacterial fiber structure of this embodiment, and the deodorizing and antibacterial fiber structure itself, will be described in detail below.
[0017] <Fiber Structures> In this embodiment, the fiber structures to be given deodorizing and antibacterial properties are the fibers themselves or structures using them. The fiber structures prepared before the deodorizing and antibacterial properties are given may be in the form of the final product as is, or they may be modified or combined with other components to change their shape and configuration before becoming the final product.
[0018] Such fiber structures can take various forms, including yarn, knitted fabrics, woven fabrics, and nonwoven fabrics. Specific products include, for example, various types of clothing, socks, tights, sportswear, outdoor products, bedding, rugs, curtains, indoor cloths, and hygiene products such as bandages, gauze, and masks. In particular, the fiber structures of the present invention are suitable for application to sportswear, clothing, socks, tights, outdoor products, and bedding because they have excellent wash durability, can deodorize sweat odors, and possess antibacterial properties.
[0019] The fibrous structure used in this embodiment may have cellulose fibers, and may consist solely of cellulose fibers, or it may also have fibers other than cellulose fibers.
[0020] Examples of the cellulose fibers mentioned above include natural cellulose fibers such as cotton, linen, and jute; regenerated cellulose fibers such as rayon, cupro, and lyocell; and semi-synthetic cellulose fibers such as acetate and triacetate. Among these, natural cellulose fibers are preferred due to their abundance of functional groups.
[0021] Other fibers besides the aforementioned cellulose fibers include, for example, wool, silk and other protein fibers, synthetic fibers such as polyester resins, polyamide resins, acrylic resins, and polyurethane resins, as well as composites and mixtures thereof. In addition, synthetic fibers can be mixed with materials other than synthetic fibers (such as metals or inorganic substances), or blends of synthetic fibers and protein fibers. Furthermore, composite fibers (core-sheath fibers) in which different materials are mixed within a single fiber are also acceptable, in which case it is sufficient that the outermost layer is made of cellulose fibers.
[0022] In this embodiment, when the fibrous structure contains fibers other than cellulose fibers, it is preferable that the fibrous structure contains 30% by mass or more of cellulose fibers, more preferably 40% by mass or more, and even more preferably 50% by mass or more, from the viewpoint of deodorizing acidic odors. Furthermore, when the structure contains fibers other than cellulose fibers, synthetic fibers such as polyester fibers, polyamide fibers, acrylic fibers, and urethane fibers are preferred as the fibers other than cellulose fibers, and among these, polyurethane fibers are more preferably used because they have excellent elasticity and a good texture and feel.
[0023] <Processing Liquid> The processing liquid used in this embodiment is an aqueous solution obtained by dissolving a polycarboxylic acid (A) and a phosphoric acid compound and / or its salt (B) in an aqueous solvent. That is, the aqueous solvent may consist only of water, or a water-soluble organic solvent such as ethanol, n-propanol, or ethylene glycol may be used together with or in place of water, depending on the type of auxiliary agents and additives used, the material of the target fiber structure, etc. In some cases, a dispersion or a non-aqueous solvent may also be used.
[0024] [Polycarboxylic acid (A)] The polycarboxylic acid (A) excludes the organic phosphoric acid compounds included in the phosphoric acid compounds and their salts (B) described below, and may be an aliphatic polycarboxylic acid or an aromatic polycarboxylic acid.
[0025] Examples of the aliphatic polycarboxylic acid include saturated dicarboxylic acids such as malic acid, tartaric acid, oxalic acid, malonic acid, succinic acid, glutaric acid, and adipic acid; unsaturated dicarboxylic acids such as maleic acid and fumaric acid; and trivalent or higher carboxylic acids such as citric acid. Among these, polycarboxylic acids having a hydroxyl group are preferred from the viewpoint of improving affinity with hydrophilic odor components. Examples of aliphatic polycarboxylic acids having a hydroxyl group include citric acid, malic acid, and tartaric acid.
[0026] Examples of the aforementioned aromatic polycarboxylic acids include dicarboxylic acids having a benzene ring, such as phthalic acid, isophthalic acid, and terephthalic acid, as well as other aromatic polycarboxylic acids such as trimellitic acid and pyromellitic acid.
[0027] Such polycarboxylic acids (A) can exhibit better deodorizing properties because even if the carboxyl groups are consumed in bonding with cellulose in the fiber structure, free carboxyl groups remain.
[0028] The concentration of polycarboxylic acid (A) in the processing liquid can be flexibly set according to the basis weight of the fiber structure and the mass to be fixed to the fiber structure. For example, the polycarboxylic acid (A) can be 10 g / m of the fiber structure. ２ When fixing the material, the fiber structure has a basis weight of 1014 g / m². ２ Taking cotton canvas No. 1 (formerly JIS L3102) as an example, a treatment liquid containing 0.5% by mass of polycarboxylic acid (A) should be applied at a concentration of 200% by mass (with a squeezing ratio of 200%) to fix it in place. 1014 g / m ２ ×2×0.005=10g / m ２
[0029] Thus, regarding the fixation of the polycarboxylic acid (A), it is preferable to set the concentration of the polycarboxylic acid (A) in the treatment liquid and the amount of it attached (squeezing ratio) according to the properties of the fiber structure itself (for example, the density of the fibers). This is because although the basis weight varies considerably depending on the fiber structure, the deodorizing effect is determined by the amount of deodorizing components fixed per unit area, regardless of the basis weight of the fiber structure. Furthermore, considering that the water absorption rate increases when the density of the fiber structure is high, making it difficult to squeeze it out completely, it is preferable to set the amount of polycarboxylic acid (A) fixed to the fiber structure by reducing the amount of treatment liquid to be attached.
[0030] [Phosphoric Acid Compounds and / or Salts thereof (B)] In this embodiment, a phosphate compound means an organic or inorganic compound having at least one phosphate group. Examples of the phosphate compound include inorganic phosphate compounds such as phosphoric acid, pyrophosphate, tripolyphosphate, hexametaphosphate, and metaphosphate, and organic phosphate compounds such as glyceric acid and phytic acid. However, since organic phosphate compounds pose risks such as the generation of harmful substances when heated and skin damage, inorganic phosphate compounds are preferred in terms of safety, and linear phosphates such as phosphoric acid, pyrophosphate, and polyphosphate are particularly preferred, with tripolyphosphate being even more preferred.
[0031] Examples of salts of the aforementioned phosphate compound include alkali metal salts (sodium salts, potassium salts, etc.), alkaline earth metal salts (calcium salts, magnesium salts), and ammonium salts. However, alkali metal salts are preferred in terms of cost and safety, and sodium salts are particularly preferred.
[0032] In this embodiment, the phosphate compound and / or its salt (B) acts as a catalyst, and it is preferable to use phosphates or polyphosphates, and particularly preferable to use tripolyphosphates, due to their superior reactivity and durability.
[0033] Specifically, sodium tripolyphosphate, sodium hexametaphosphate, monosodium phosphate (sodium dihydrogen phosphate), disodium phosphate (disodium hydrogen phosphate), and trisodium phosphate are preferred as the phosphate compound and / or its salt (B), and among these, sodium phosphate and sodium tripolyphosphate are preferred in terms of cost and safety.
[0034] The concentration of the phosphoric acid compound and / or its salt (B) in the processing liquid can also be flexibly set according to the basis weight of the fiber structure and the mass to be fixed to the fiber structure, similar to the polycarboxylic acid (A).
[0035] The mass ratio [(B) / (A)] of the phosphoric acid compound and / or its salt (B) to the polyvalent carboxylic acid (A) is preferably set to 0.01 to 100, more preferably 0.01 to 50, and even more preferably 0.02 to 50, from the viewpoint of ammonia deodorizing power.
[0036] In addition to the above, various additives such as a resin binder, a swelling agent, a penetrant, an emulsifying / dispersing agent, a sequestering agent, a leveling agent, a softener, a precipitation inhibitor, a migration inhibitor, a carrier, a resist agent, an anti-wrinkle agent, a texture improver, etc. can be blended into the treatment liquid as needed. However, from the gist of the present invention, even when a resin binder is blended, the concentration in the treatment liquid is preferably set to 10% or less, more preferably 5% or less.
[0037] [Contact method and heat treatment] The method of bringing the treatment liquid into contact with the fiber structure and the method of heating them can be appropriately selected according to the type and material of the target fiber structure. For example, as shown in FIG. 1, a method of immersing the fiber structure 2 in the treatment liquid 6 and then performing a heat treatment under a predetermined temperature and a predetermined pressure can be mentioned. That is, after putting water into the treatment tank 1 for immersing the target fiber structure 2, the processing preparation agent (agent 1 or agent 2) is put into this water to prepare a predetermined treatment liquid 6. Then, after immersing the fiber structure 2 in the treatment liquid 6 in the treatment tank 1, it is passed through a squeezing roll 3, pulled up while being gently squeezed, and introduced into a heating device 4. While moving the fiber structure 2 to which a predetermined amount of the treatment liquid 6 has adhered in the heating device 4, a heat treatment (so-called "pad-dry processing") at a predetermined temperature (the ambient temperature in the heating device 4 exceeds 100°C and is 200°C or less) and a predetermined time (0.5 minutes or more) is performed, and it is dried through a dryer 5 as needed.
[0038] Also, as another method of bringing the treatment liquid into contact with the fibrous structure, the treatment liquid is adhered to the fibrous structure by immersion (impregnation), spraying, coating, etc. under normal pressure, and after squeezing at a predetermined squeezing rate by mangle or centrifugation, etc., the fibrous structure is heat-treated under normal pressure or under pressure.
[0039] The heat treatment in the state where the treatment liquid is in contact with the fibrous structure is performed under normal pressure or under pressure. The temperature (atmospheric temperature) of the heat treatment at this time exceeds 100°C and is 200°C or lower, preferably 120 to 200°C, and more preferably 140 to 180°C. When the temperature of the heat treatment is 100°C or lower, sufficient temperature is not applied to the fibrous structure, and the fixation of components tends to be insufficient. On the contrary, when the temperature of the heat treatment exceeds 200°C, the fibrous structure tends to be damaged. Also, the heat treatment time is 0.5 minutes or more, preferably 0.5 to 10 minutes, and more preferably 0.5 to 3 minutes.
[0040] According to the contact method and heat treatment of the present embodiment, without reacting with monomers, metals, etc., polyvalent carboxylic acid (A) and phosphoric acid compound and / or its salt (B) can be fixed to a fibrous structure having cellulose fibers as they are without using a resin binder.
[0041] The deodorant / antibacterial fibrous structure thus obtained has polyvalent carboxylic acid (A) fixed to the fibrous structure having cellulose fibers at 0.1 to 10 g / m ２ and, among others, from the viewpoints of pH and cost, those fixed at 0.1 to 5 g / m <00000'08> are preferable.
[0042] Also, the deodorant / antibacterial fibrous structure has phosphoric acid compound and / or its salt (B) fixed to the fibrous structure having cellulose fibers at 0.1 to 10 g / m ２ and, among others, from the viewpoints of discoloration and cost, it is preferably fixed at 0.1 to 5 g / m ２ [[ID=2'2]]
[0043] Furthermore, the deodorizing and antibacterial fiber structure contains a fiber structure with cellulose fibers, and the total amount of polycarboxylic acid (A) and phosphoric acid compounds and / or their salts (B) is 0.2 to 10 g / m². ２ It is fixed in place, and in particular, considering cost and discoloration, 1 to 6 g / m ２ It is preferable that it be fixed in place.
[0044] Thus, when a predetermined amount of polycarboxylic acid (A) and a phosphoric acid compound and / or its salt (B) is fixed to a cellulose fiber structure, the deodorizing and antibacterial fiber structure is provided with deodorizing properties such that the deodorization rate of ammonia, acetic acid, and isovaleric acid after 10 washes at 40°C is 30% or more, and antibacterial properties such as an antibacterial activity value of 2.2 or higher according to JIS L1902:2015.
[0045] The aforementioned deodorizing properties are presumed to be due to the formation of a composite film on the surface of the fiber structure by the heat treatment under predetermined conditions, consisting of the polycarboxylic acid (A) and a phosphoric acid compound and / or its salt (B), and that this composite film has the property of adsorbing both alkaline and acidic odors. Furthermore, because this composite film is firmly fixed to the fiber structure having the cellulose fibers, there is almost no decrease in deodorizing properties even after 10 washes at 40°C. Specifically, it is considered that a fiber structure can be obtained in which the deodorizing properties of ammonia, acetic acid, and isovaleric acid are each reduced by 30% or more after 10 washes.
[0046] On the other hand, the antibacterial properties are presumed to be due to the polycarboxylic acid (A) in the composite film formed on the fiber structure, as this composite film contains the polycarboxylic acid (A). Since the antibacterial properties are maintained even after 10 washes at home, it can be said that the deodorizing and antibacterial fiber structure of this embodiment has durable antibacterial properties.
[0047] 40°C home washing refers to the washing method specified in Appendix 1, item 103 of JIS L0217 "Symbols and methods of indicating the handling of textile products" (1995), and in this embodiment, this washing method is referred to as "JIS L0217-103". Specifically, water at 40±2°C is added to a household electric washing machine so that the bath ratio is 1:30, an alkaline synthetic detergent is added and dissolved, the washing is done under strong conditions for 5 minutes, then drained and spun dry, rinsed and spun dry for 2 minutes, and then rinsed and spun dry again for 2 minutes, which constitutes one cycle. After 10 washes refers to the time after this process has been repeated 10 times. In this embodiment, the deodorizing and antibacterial fiber structure is obtained by hanging and drying the fiber structure after the final spin-drying step is completed.
[0048] [Deodorizing properties] In this embodiment, the deodorizing properties are evaluated in accordance with the performance test method for deodorizing processed textile products (ISO 17299-3 gas chromatography method) as follows: The textile structure to be measured is measured at 50 cm ２ Sample pieces were prepared by cutting the material into pieces. 5 μL of odor components, adjusted for each odor, were injected into a sealed 500 mL Erlenmeyer flask containing these sample pieces. After 2 hours, the flask was vigorously stirred, and the odor concentration of the sample pieces was measured using a gas chromatograph. At the same time, the same procedure was performed without the sample pieces, and the odor concentration measured was used as the blank concentration. The deodorization rate (%) was calculated based on the following formula. Therefore, a higher value for the deodorization rate (%) indicates better deodorization performance. • Deodorization rate (%) = (1 - (Odor concentration of sample piece) / (Blank concentration)) × 100
[0049] [Antibacterial Properties] In this embodiment, antibacterial properties were evaluated by the following method in accordance with JIS L1902. Specifically, Staphylococcus aureus was inoculated into a standard piece (cotton cloth that does not show antibacterial activity) and into sample pieces obtained by cutting the target fibrous structure. After incubation at 37°C for 18 to 24 hours, the number of viable bacteria in each piece was measured. The antibacterial activity value was then calculated from the obtained number of viable bacteria based on the formula shown below.
[0050] • Antimicrobial activity value = (LogCt - LogCo) - (LogTt - LogTo) • Growth value of standard specimen = (LogCt - LogCo) LogCo: Common logarithm of the arithmetic mean of the number of viable cells in the standard specimen immediately after inoculation with the test bacteria LogCt: Common logarithm of the arithmetic mean of the number of viable cells in the standard specimen after 18 hours of incubation LogTo: Common logarithm of the arithmetic mean of the number of viable cells in the sample specimen immediately after inoculation with the test bacteria LogTt: Common logarithm of the arithmetic mean of the number of viable cells in the sample specimen after 18 hours of incubation
[0051] According to this embodiment, durable deodorizing properties against both alkaline and acidic odors, as well as durable antibacterial properties, can be imparted to cellulose fiber structures without the use of highly toxic deodorants, antibacterial agents, etc. Therefore, the deodorizing and antibacterial fiber structures of this embodiment can be suitably used in clothing and non-clothing applications such as clothing, bedding, gloves, hats, futon covers, curtains, and tents, which come into direct contact with the skin and easily absorb sweat.
[0052] The present invention will be described in more detail below with reference to examples, but the present invention is not limited to the following examples unless it exceeds the gist of the invention. In the examples, "%" means by mass basis.
[0053] <Processing Liquid> A processing liquid was prepared by blending the following components to have the composition shown in Tables 1 to 4 below. In each table, sodium is abbreviated as Na, potassium as K, calcium as Ca, and magnesium as Mg.
[0054] <Textile Structures> Details of each textile structure to be studied are as follows: • Textile Structure I: 100% cotton, 96.5 g / m² ２ • Fiber structure II: 85% cotton, 15% polyurethane, weight 190 g / m ２ • Fiber structure III: 50% cotton, 50% polyester, weight 167 g / m ２ • Fiber structure IV: 100% rayon, basis weight 99 g / m ２ • Fiber structure V: 100% cotton twill, weight 305.1 g / m ２
[0055] [Example 1] <0 washes> The treatment liquid described in Table 1 below was prepared, and the fiber structure described in Table 1 below was immersed in a treatment tank filled with this treatment liquid. The fiber structure was then pulled up while being squeezed by passing it through a squeezing roll so that the amount of treatment liquid relative to the mass of the fiber structure was predetermined (squeezing rate 100%), and then heat-treated at 160°C for 2 minutes while moving it inside a pin tenter (PT-2A, manufactured by Tsujii Dyeing Machine Co., Ltd.), and then air-dried overnight to obtain a deodorizing and antibacterial fiber structure (0 washes). <10 washes> The deodorizing and antibacterial fiber structure (0 washes) was washed 10 times at 40°C according to the standard washing method specified in "Washing Method for SEK Mark Textile Products", and then air-dried overnight to obtain a deodorizing and antibacterial fiber structure (10 washes).
[0056] [Examples 2-42, Comparative Examples 1-16] Except for changing the processing liquid, heat treatment, fiber structure, etc., to those listed in Tables 1-6 below, deodorizing and antibacterial fiber structures were obtained in the same manner as in Example 1, after 0 washes and 10 washes. Note that in Examples 28, 37, 38, and 42, the basis weight of the fiber structure differs from that of Example 1, so when the wringing ratio is the same 100%, the amount of adhesive per unit area increases or decreases according to the basis weight of the fiber structure. ２ To adjust the amount of each component fixed per unit, the concentration of each component in the processing liquid is adjusted according to the basis weight of the fiber structure, using Example 1 as a reference. Specifically, in Example 28, where the basis weight is about twice that of Example 1, the amount of each component is about 0.5 times that of Example 1; in Example 37, where the basis weight is about 1.7 times, it is about 0.6 times; in Example 38, where the basis weight is about the same, it is about the same; and in Example 42, where the basis weight is about three times, it is about 0.3 times.
[0057]
[0058]
[0059]
[0060]
[0061]
[0062]
[0063] The amount of components fixed to the deodorizing and antibacterial fiber structures obtained under the conditions shown in Tables 1 to 6 was calculated and is shown in Tables 7 to 12 below. In addition, to evaluate the washing durability of the obtained example and comparative example samples, the deodorizing and antibacterial properties were measured for 10 washes using the method described in the above sections on [Deodorizing Properties] and [Antibacterial Properties], and evaluated based on the following indicators. The results are also shown in Tables 7 to 12 below.
[0064] <Deodorizing properties> ◎ (excellent) ... 70% or more 〇 (very good) ... 50% or more but less than 70% △ (good) ... 30% or more but less than 50% × (poor) ... less than 30%
[0065] <Antibacterial properties> ○ (very good) ... Antibacterial activity value of 2.2 or higher × (poor) ... Antibacterial activity value of less than 2.2
[0066]
[0067]
[0068]
[0069]
[0070]
[0071]
[0072] From the results shown in Tables 7 to 12, it can be seen that Examples 1 to 42 deodorized both alkaline odors (ammonia) and acidic odors (acetic acid, isovaleric acid), and that both deodorizing and antibacterial properties were excellent in terms of durability. On the other hand, Comparative Examples 1 to 16 were inferior in at least one of the antibacterial and deodorizing properties, and did not possess all of the above qualities. In Comparative Example 7, the processing liquid itself was the same as in Example 10, but the heat treatment conditions were different, so it is thought that the citric acid (component A) and / or sodium tripolyphosphate (component B) were not sufficiently fixed to the fiber structure at a processing temperature of 100°C (indicated by an asterisk in Table 10 for the amount of fixation). Similarly, in Comparative Example 16, the processing liquid itself was the same as in Example 10, but the heat treatment conditions were different, so it is thought that the citric acid (component A) and / or sodium tripolyphosphate (component B) were not sufficiently fixed to the fiber structure at a heat treatment of 0.1 minutes (indicated by an asterisk in Table 11 for the amount of fixation).
[0073] While the above embodiments illustrate specific forms of the present invention, these embodiments are merely illustrative and should not be interpreted restrictively. Various modifications that are obvious to those skilled in the art are intended to fall within the scope of the present invention.
[0074] The deodorizing and antibacterial fiber structure of the present invention is environmentally friendly as it uses naturally occurring substances, has excellent wash durability and deodorizing properties for sweat odor, and possesses antibacterial properties, making it safe to use in clothing, bedding, and other items that come into direct contact with the skin.
[0075] 1. Processing tank 2. Fiber structure 3. Squeezing roll 4. Heating device 5. Dryer 6. Processing liquid
Claims
1. A method for producing a deodorizing and antibacterial fiber structure, comprising bringing a processing liquid into contact with a fiber structure having cellulose fibers and performing a heat treatment at a temperature exceeding 100°C and not exceeding 200°C for 0.5 minutes or more under normal pressure or under pressurized conditions, wherein the processing liquid comprises a polycarboxylic acid and a phosphoric acid compound and / or a salt thereof.
2. The method for producing a deodorizing and antibacterial fiber structure according to claim 1, wherein the mass ratio of the phosphoric acid compound and / or its salt to the polyhydric carboxylic acid ("phosphoric acid compound and / or its salt" / "polyhydric carboxylic acid") in the processing liquid is set to 0.01 to 100.
3. A fibrous structure containing cellulose fibers contains 0.1 to 10 g / m² of polycarboxylic acid. ２ It is immobilized and contains 0.1 to 10 g / m of phosphate compounds and / or their salts. ２ A fixed deodorizing and antibacterial fiber structure in which the deodorizing rate of ammonia, acetic acid, and isovaleric acid is 30% or more after 10 washes at 40°C (in accordance with JIS L0217-103).
4. A deodorizing and antibacterial fiber structure obtained by bringing a treatment liquid containing a polyvalent carbone and a phosphate compound and / or a salt thereof into contact with a fiber structure having cellulose fibers, and performing a heat treatment at a temperature exceeding 100°C and not exceeding 200°C for 0.5 minutes or more under normal pressure or pressurized pressure, wherein the deodorizing and antibacterial fiber structure has a deodorization rate of 30% or more for ammonia, acetic acid, and isovaleric acid after 10 washes at 40°C (in accordance with JIS L0217-103).