textile materials

Abstract

To provide a fiber material having an excellent antibacterial property, and capable of maintaining the high antibacterial property after alkaline treatment and several washing.SOLUTION: A fiber material contains a resin and zinc oxide particles. The zinc oxide particles are surface-treated with polysiloxane. A value obtained by dividing a surface treatment amount (weight %) with regard to the zinc oxide particle by a specific surface area (m2 / g) of the zinc oxide particle before treatment is 0.07 to 0.13.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a fibrous material comprising zinc oxide. [Background technology]

[0002] Textile materials are widely used in various fields, including clothing, automobiles, construction, and medicine. In recent years, attempts have been made in the clothing industry to impart antibacterial and deodorizing properties to fibers. For example, antibacterial fibers incorporating silver-based compounds have been reported (see Patent Document 1). In addition to silver, zinc oxide is also widely known as an antibacterial material. Examples of such materials include polyesters incorporating zinc oxide treated with a coupling agent (see Patent Document 2), fibers formed into threads by kneading zinc oxide microparticles into artificial fiber raw materials (see Patent Document 3), fibers in which zinc oxide particles with antibacterial and deodorizing properties are dispersed and whose photocatalytic activity is suppressed (see Patent Document 4), and polyesters containing silicone-treated zinc oxide and silica sol (see Patent Document 5). Furthermore, an antibacterial molded product has been proposed in which a mixture of powders of simple substances or compounds of silver, zinc, lead, or iron, with a specified temperature and average particle size, and an organic polysiloxane with a specified viscosity, is dispersed in a thermoplastic molded product with a specified melting point (see Patent Document 6). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2010 / 143317 [Patent Document 2] Japanese Patent Application Laid-Open No. 2011-111704 [Patent Document 3] Japanese Patent Application Publication No. 5-156510 [Patent Document 4] Japanese Patent Application Publication No. 7-197309 [Patent Document 5] Japanese Patent Publication No. 2020-117827 [Patent Document 6] Japanese Patent Application Publication No. 1-250411 Summary of the Invention [Problem to be solved by the invention]

[0004] As mentioned above, various materials have been proposed in which metal components are blended into fibers to impart antibacterial properties, but although silver compounds among the metal components are excellent antibacterial materials, when blended into fibers such as polyester, the silver ions can react with the substrate, causing problems such as yellowing. Also, in order to impart texture to textile materials, alkaline treatment is generally performed to partially hydrolyze the fibers with a sodium hydroxide aqueous solution, etc., but when this treatment is performed on fibers blended with a silver-based antibacterial agent, the silver elutes, resulting in a problem of a significant decrease in antibacterial activity. Regarding polyester blended with zinc oxide particles treated with a coupling agent, although the coupling agent has a functional group at the end, which is more advantageous for adhering to the fiber polymer than untreated zinc oxide particles, there is a risk of the surface-treated zinc oxide particles coheding together due to the action of hydrogen bonding, etc., and problems such as yellowing can occur when the coupling agent is decomposed by alkali. Furthermore, textile materials blended with conventional zinc oxide particles have the problem that their antibacterial activity decreases with alkali treatment, just like silver-based antibacterial agents, and that the zinc oxide particles fall off with repeated washing, reducing their antibacterial properties.

[0005] In view of the above-mentioned current situation, an object of the present invention is to provide a fiber material that has excellent antibacterial properties and can maintain high antibacterial properties even after alkali treatment and multiple washings. [Means for solving the problem]

[0006] The present inventors have investigated fiber materials that have excellent antibacterial properties and can maintain high antibacterial properties even after alkali treatment and multiple washings, and have found that when zinc oxide particles that have been surface-treated with polysiloxane so that the surface treatment amount relative to the zinc oxide particles falls within a predetermined range are blended with a resin and the resulting fiber material is made into a fiber form, the resulting fiber material has excellent antibacterial properties and can maintain high antibacterial properties even after alkali treatment and multiple washings, thereby solving the problems of the invention. Furthermore, the present inventors have found that such a material has excellent not only antibacterial properties but also antiviral properties, which led to the completion of the present invention.

[0007] That is, the present invention provides a fiber material containing a resin and zinc oxide particles, wherein the zinc oxide particles are surface-treated with polysiloxane, and the amount of surface treatment (wt%) relative to the zinc oxide particles is determined based on the specific surface area (m 2 / g) is 0.07 to 0.13.

[0008] The zinc oxide particles preferably have an average primary particle size of 25 to 250 nm.

[0009] The above-mentioned fiber material preferably has an antibacterial activity value of 2.2 or more in an antibacterial test carried out using Staphylococcus aureus and Klebsiella pneumoniae according to the method of JIS L1902:2015.

[0010] The above-mentioned fiber material preferably has an antibacterial activity value of 2.2 or more in an antibacterial test carried out using Staphylococcus aureus and Klebsiella pneumoniae according to the method of JIS L1902:2015 after being washed 30 times.

[0011] The polysiloxane is preferably at least one selected from the group consisting of dialkylpolysiloxane, methylhydrogenpolysiloxane, and (dimethicone / methicone) copolymer.

[0012] The resin preferably has a contact angle with water at 25°C of 60 to 105°. [Effects of the Invention]

[0013] The fiber material of the present invention has excellent antibacterial properties and can maintain high antibacterial properties even after alkali treatment and multiple washings, and therefore can be suitably used as a material for clothing and other items that require antibacterial properties. Furthermore, the fiber material of the present invention is an excellent material in that it has high antiviral properties in addition to antibacterial properties. DETAILED DESCRIPTION OF THE INVENTION

[0014] Preferred embodiments of the present invention will be specifically described below, but the present invention is not limited to the following description and can be appropriately modified and applied within the scope that does not change the gist of the present invention.

[0015] The fiber material of the present invention is a material in which the amount of surface treatment (wt%) of zinc oxide particles is adjusted to the specific surface area (m 2 The composition is characterized by comprising zinc oxide particles that have been surface-treated with polysiloxane so that the value obtained by dividing by the total mass of the resin and the weight of the zinc oxide particles by the total mass of the resin is 0.07 to 0.13. In addition to zinc oxide, copper and titanium oxide are also known to have antibacterial properties. However, copper discolors fibers when incorporated into them. Titanium oxide also has a tendency to generate radicals, and when titanium oxide, which has antibacterial properties, is incorporated into fibers, photoactivation can damage the fibers themselves. Furthermore, when untreated zinc oxide particles are incorporated into polyethylene terephthalate fibers, they act as a base catalyst and, depending on the amount incorporated, can hydrolyze the fibers. In contrast, zinc oxide particles surface-treated with polysiloxane do not damage the fibers themselves or discolor them. Furthermore, simply incorporating zinc oxide particles into fibers can result in the zinc oxide particles shedding from the fibers during alkali treatment or washing, reducing the antibacterial properties. However, surface-treating zinc oxide particles with polysiloxane improves the compatibility of the zinc oxide particles with fibers, preventing them from shedding during washing. However, if the amount of surface treatment is too high, the surfaces of the zinc oxide particles become over-covered with polysiloxane, resulting in insufficient antibacterial properties. The fiber material of the present invention uses zinc oxide particles that have been appropriately surface-treated with polysiloxane, thereby exhibiting excellent antibacterial properties and maintaining the excellent antibacterial properties even after alkali treatment and multiple washings. The textile material of the present invention also has excellent antiviral properties. This is because the mechanism of action of antibacterial agents is generally also effective against viruses, and the textile material of the present invention, which has excellent antibacterial properties, also has high antiviral properties. Furthermore, this high antiviral property is maintained even after alkali treatment and multiple washings. The amount of surface treatment (wt%) on zinc oxide particles was calculated based on the specific surface area (m 2 The value obtained by dividing by (wt. / g) may be 0.07 to 0.13, preferably 0.08 to 0.12, and more preferably 0.08 to 0.11.

[0016] The fiber material of the present invention preferably has an antibacterial activity value of 2.2 or more in an antibacterial test conducted using Staphylococcus aureus and Klebsiella pneumoniae according to the method of JIS L1902:2015. Such an antibacterial activity value can be said to have sufficient antibacterial properties. More preferably, the antibacterial activity value in the antibacterial test is 3 or more. The quantitative test in the antibacterial test can be carried out by the method described in the Examples below.

[0017] Furthermore, the fiber material of the present invention preferably has an antibacterial activity value of 2.2 or more in an antibacterial test conducted using Staphylococcus aureus and Klebsiella pneumoniae according to the method of JIS L1902:2015 after 30 repeated washings. Such antibacterial activity can be said to maintain sufficient antibacterial properties even after washing. It is more preferable that the antibacterial activity value in the antibacterial test after 30 repeated washings is 3 or more. The quantitative test in the antibacterial test can be carried out by the method described in the Examples below.

[0018] The amount of zinc oxide particles contained in the fiber material of the present invention is preferably such that the amount of zinc oxide particles before surface treatment is 0.01 to 5 parts by weight per 100 parts by weight of the resin contained in the fiber material. If the amount of zinc oxide particles is more than 5 parts by weight, spinning may be difficult, and if it is less than 0.01 part by weight, sufficient antibacterial and antiviral properties may not be imparted to the fiber. More preferably, the amount of zinc oxide particles before surface treatment is 0.05 to 5 parts by weight, even more preferably 0.1 to 3 parts by weight, and particularly preferably 0.1 to 1 part by weight per 100 parts by weight of the resin contained in the fiber material.

[0019] The zinc oxide particles have a specific surface area of ​​3 to 100 m 2 / g is preferable. With such a specific surface area, it is possible to exhibit more excellent antibacterial activity. In addition, it is easy to knead uniformly into the resin, and the antibacterial effect can be uniformly imparted to the entire fiber. 2 / g, the number of coarse particles increases and the strength of the thread weakens. 2 If the specific surface area of ​​the zinc oxide particles is larger than 5000 m / g, they tend to aggregate in the resin, which increases the risk of the thread breaking. 2 / g, and more preferably 8 to 40 m 2 / g. The specific surface area of ​​the zinc oxide particles in the present invention can be measured by the method described in the examples below.

[0020] The zinc oxide particles preferably have an average primary particle diameter of 25 to 250 nm. Such a particle diameter improves fiber processability and results in fibers with excellent strength. Zinc oxide particles with an average primary particle diameter of less than 25 nm not only require a large amount of energy to disperse the particles but also tend to dissolve easily during alkaline washing. Zinc oxide particles with an average primary particle diameter of more than 250 nm not only reduce the number of active sites for antibacterial effect but also tend to cause thread breakage and fluffing during fiber processing. The average primary particle diameter of the zinc oxide particles is more preferably 30 to 150 nm. The average primary particle size in the present invention can be measured by the method described in the examples below.

[0021] The zinc oxide particles contained in the fiber material of the present invention have been surface-treated with polysiloxane. As mentioned above, surface-treating zinc oxide particles with polysiloxane improves their compatibility with fibers and effectively prevents the zinc oxide particles from falling off the fibers during alkali treatment or washing. Furthermore, polysiloxane, which contains silicon as its main constituent element, does not color fibers, making zinc oxide particles surface-treated with polysiloxane suitable as a material for imparting antibacterial and antiviral properties to textile materials. The polysiloxane is preferably at least one selected from the group consisting of dialkylpolysiloxane, methylhydrogenpolysiloxane, and dimethicone / methicone copolymer. Among them, methylhydrogenpolysiloxane and dimethicone / methicone copolymer are preferred because of their high reactivity with zinc oxide.

[0022] The amount of polysiloxane used for surface treatment is preferably 0.6 to 3 parts by weight per 100 parts by weight of zinc oxide particles before surface treatment. More preferably, it is 0.7 to 3 parts by weight, and even more preferably, it is 0.8 to 3 parts by weight. If the amount is too small, the zinc oxide particles will dissolve during the alkali treatment, reducing their antibacterial activity. If the amount is too large, the zinc oxide particles will aggregate, or their surfaces will be over-coated with polysiloxane, reducing their antibacterial activity. Furthermore, when highly reactive silicones such as methylhydrogenpolysiloxane or (dimethicone / methicone) copolymer are used as polysiloxanes, excessive amounts used for treatment can result in the generation of hydrogen gas from unreacted Si-H moieties during the spinning process, causing problems such as foaming and reduced yarn strength. The amount of hydrogen generated is preferably 1 ml or less per gram of surface-treated zinc oxide particles.

[0023] The fiber material of the present invention contains a resin, and the resin is not particularly limited, but examples thereof include polyethylene, polypropylene, polyester, polyvinyl chloride, polyurethane, nylon, aramid, vinylon, vinylidene, acrylic, polychlor, and polylactic acid. The resin contained in the fiber material of the present invention may be any of these, and may contain one kind of these or two or more kinds of these.

[0024] The resin contained in the fiber material of the present invention is preferably one having a contact angle with water of 60 to 105° at 25°C. Such lipophilic resins are particularly compatible with zinc oxide particles surface-treated with polysiloxane, and by combining such resins with zinc oxide particles surface-treated with polysiloxane, the resulting fiber material can maintain high antibacterial properties even after alkali treatment or multiple washings. Examples of resins having a contact angle with water of 60 to 105° at 25°C include polyethylene terephthalate, nylon, polyvinyl chloride, and polyethylene. More preferably, the resin has a contact angle with water of 65 to 100° at 25°C, and even more preferably, the resin has a contact angle with water of 70 to 95° at 25°C. The contact angle of the resin with water can be measured using a contact angle measuring device and calculated using the Young-Laplace method.

[0025] The fiber material of the present invention may contain other components, such as a colorant and an antibacterial agent other than the zinc oxide particles, as long as the fiber material contains a resin and zinc oxide particles surface-treated with polysiloxane. The other components may include one or more of these.

[0026] The method for surface-treating the zinc oxide particles contained in the fiber material of the present invention with polysiloxane is not particularly limited, but can be carried out, for example, by mixing the zinc oxide particles with polysiloxane in a dry or wet manner, or by performing a dry treatment followed by a heat treatment.

[0027] Although the method for producing the fiber material containing the resin of the present invention and zinc oxide particles is not particularly limited, it is preferable to uniformly blend the zinc oxide particles in the resin, and kneading is preferably carried out using a twin-screw kneading extruder, a mixer, etc. Furthermore, from the viewpoint of dispersing the particles more uniformly, one suitable method for producing the fiber material of the present invention is to pre-knead the zinc oxide particles with a resin in an amount 0.5 to 20 times the weight of the zinc oxide particles to obtain a blend of the resin and the zinc oxide particles, and then knead the blend with the resin to obtain a fiber material. Furthermore, when the fiber material of the present invention is spun into a thread for use, the spinning method is not particularly limited, and can be appropriately selected from spinning methods such as melt spinning, dry spinning, wet spinning, and extrusion spinning depending on the type of fiber to be used.

[0028] The fiber material of the present invention has excellent antibacterial and antiviral properties, and retains these properties even after multiple washings. Therefore, it can be suitably used for a variety of applications, including clothing, bedding, and interior goods. [Example]

[0029] Specific examples are given below to explain the present invention in detail, but the present invention is not limited to these examples. Unless otherwise specified, "%" and "wt%" mean "weight % (mass %)." The methods for measuring each physical property are as follows.

[0030] <Specific surface area of ​​zinc oxide particles> The specific surface area was measured using a fully automatic specific surface area measuring device, Macsorb HM model-1220, manufactured by Mountech. <Average primary particle size of zinc oxide particles> The average primary particle diameter was determined as the median value of the circumscribed circle diameters of 200 particles observed under a transmission electron microscope.

[0031] <Amount of hydrogen generated by zinc oxide particles> 10 g of polysiloxane-treated zinc oxide particles and 50 ml of ethanol were placed in a 200 ml Erlenmeyer flask, and while stirring with a magnetic stirrer, 20 ml of a 1% potassium hydroxide / ethanol solution was added in a sealed state. The generated gas was collected for 10 minutes by the water displacement method, and the amount of generated gas was measured.

[0032] Production Example 1 (Production of zinc oxide particles surface-treated with polysiloxane) High-speed agitator mixer with a specific surface area of ​​10m 21 / g of zinc oxide particles were added and stirred at a speed that allowed the entire powder to rotate slowly. While continuing to stir at that speed, 1% hydrogen dimethicone (KF-99, manufactured by Shin-Etsu Silicone Co., Ltd.) was added dropwise to the zinc oxide particles, and when the addition was completed, the mixture was mixed at a speed of 10 m / s or more. The removed powder was then heated at 120°C or higher to obtain surface-treated zinc oxide particles. The amount of hydrogen generated from the obtained surface-treated zinc oxide particles was measured to be 0.05 ml / g, and the average primary particle diameter was 102 nm.

[0033] 1.Antibacterial evaluation Example 1 Produced in Production Example 1, with a specific surface area of ​​10 m 2 10 parts by weight of surface-treated zinc oxide particles, surface-treated with 1% hydrogen dimethicone (KF-99, manufactured by Shin-Etsu Silicone Co., Ltd.) per 1 / g of zinc oxide particles, and 90 parts by weight of polyethylene terephthalate were uniformly mixed in a mixer for approximately 30 seconds, and then kneaded at 280°C using a 30 mmφ twin-screw kneading extruder to obtain pellets of a polyethylene terephthalate resin composition. The resulting pellets were then mixed with polyethylene terephthalate resin in a weight ratio of 4:96 using a mixer. Further, the resulting pellets were granulated at 280°C using a 30 mmφ single-screw extruder to obtain pellets for spinning. These pellets for spinning were extrusion-spun using a melt prevention device equipped with a spinneret with 48 holes to obtain yarn. Furthermore, the yarn was wetted with a 50 g / L aqueous solution of sodium hydroxide at 90°C and subjected to an alkali treatment, and the presence or absence of discoloration of the fiber was checked visually, but no discoloration was observed. Next, the treated yarn was subjected to an antibacterial test using Staphylococcus aureus and Klebsiella pneumoniae according to the JIS L1902:2015 method, and the calculated antibacterial activity value was 4.8. Furthermore, the treated yarn was washed 30 times, and then the same antibacterial test was conducted, and the calculated antibacterial activity value was 4.0. In the antibacterial test, the quantitative test was performed using the bacterial liquid absorption method, and the viable bacteria count was measured using the pour plate culture method. The test pieces were sterilized in an autoclave. The washing method was the standard washing method for SEK mark textile products by the Japan Textile Evaluation Technology Council, and the pieces were hung to dry.

[0034] Example 2 and Comparative Examples 1 to 4 Surface-treated zinc oxide particles were produced in the same manner as in Production Example 1, except that the zinc oxide particles and the hydrogen dimethicone used to surface-treat the zinc oxide particles were changed as shown in Table 1, and the amount of hydrogen generated by the particles was measured. Furthermore, yarn was obtained using the surface-treated zinc oxide particles in the same manner as in Example 1, and the presence or absence of discoloration of the fiber after alkali treatment was confirmed, and the antibacterial activity value of the fiber and the antibacterial activity value of the fiber after 30 washes were measured. In Example 2 and Comparative Example 4, KF-9901 manufactured by Shin-Etsu Silicones was used as the hydrogen dimethicone instead of KF-99 manufactured by Shin-Etsu Silicones. Comparative Example 1 was spun without adding zinc oxide particles. In Comparative Example 4, the same procedure as in Example 1 was carried out, except that instead of mixing and kneading 10 parts by weight of surface-treated zinc oxide particles and 90 parts by weight of polyethylene terephthalate to obtain pellets of a polyethylene terephthalate resin composition as in Example 1, 9.75 parts by weight of zinc oxide particles that had not been surface-treated, 0.25 parts by weight of hydrogen dimethicone (KF-9901, manufactured by Shin-Etsu Silicones Co., Ltd.), and 90 parts by weight of polyethylene terephthalate were mixed and kneaded to obtain pellets of a polyethylene terephthalate resin composition. The results are shown in Table 1.

[0035] Example 3 Produced in Production Example 1, with a specific surface area of ​​10 m 220 parts by weight of surface-treated zinc oxide particles, surface-treated with 1% hydrogen dimethicone (KF-99, manufactured by Shin-Etsu Silicone Co., Ltd.) per 1 / g of zinc oxide particles, and 80 parts by weight of polyethylene terephthalate were uniformly mixed in a mixer for approximately 30 seconds, and then kneaded at 280°C using a 30mmφ twin-screw kneading extruder to obtain pellets of a polyethylene terephthalate resin composition. The resulting pellets were then mixed with polyethylene terephthalate resin in a weight ratio of 12:88 using a mixer. Further, the resulting pellets were granulated at 280°C using a 30mmφ single-screw extruder to obtain pellets for spinning. These pellets for spinning were extruded and spun using a melt prevention device equipped with a 48-hole spinneret to obtain yarn. The concentrations of zinc oxide and polysiloxane contained in this yarn were 2.4% and 0.024%, respectively. Furthermore, the yarn was wetted with a 50 g / L aqueous solution of sodium hydroxide at 90°C and subjected to an alkali treatment, and the presence or absence of discoloration of the fiber was checked visually, but no discoloration was observed. Subsequently, in the same manner as in Example 1, the treated yarn was subjected to an antibacterial test using Staphylococcus aureus and Klebsiella pneumoniae according to the method of JIS L1902:2015, and the antibacterial activity value was calculated to be 4.7. Furthermore, after the treated yarn was washed 30 times, the same antibacterial test was performed and the antibacterial activity value was calculated to be 4.0.

[0036] [Table 1]

[0037] 2. Antiviral evaluation The spinning pellets were extrusion-spun using a melt prevention device equipped with a spinneret with 48 holes in the same manner as in Example 3, to obtain a yarn, which was then wetted with a 50 g / L aqueous solution of sodium hydroxide at 90°C and subjected to an alkali treatment.The treated yarn was then subjected to an antiviral test against influenza A by the following method in accordance with ISO 18184:2019.A similar antiviral test was also conducted on the alkali-treated yarn produced in Comparative Example 1. In Comparative Example 1, which did not contain zinc oxide, the viral infectivity titer was 6.91, whereas the viral infectivity titer measured for the yarn containing surface-treated zinc oxide in Example 3 was 2.66. The viral infectivity titer is the common logarithm mean of the number of observed plaques, and the lower the value, the fewer the number of observed plaques and the higher the antiviral activity. <Antiviral test> (1) Place 0.4g of sample into a vial. (2) 4.1 × 10 7 A 200 μL virus solution (type A influenza virus H3N2, A / Hong Kong / 8 / 68) adjusted to PFU / mL is dropped onto the sample in the vial. (3) Leave the sample at 25°C for 4 hours (ISO 18184:2019 requires leaving it for 2 hours). (4) Add 20 mL of SCDLP medium to the sample in the vial and wash out the sample by stirring for 5 seconds 5 times. (5) The viral infectivity in the washout solution is measured by the plaque method. MDCK cells (a canine artificial cell line) are used as the host cells. The above procedure is carried out three times, and the virus infectivity is calculated.

[0038] [Table 2]

[0039] Since an antibacterial activity value of 2.2 or higher is considered to have antibacterial and deodorizing effects, it was confirmed that the fiber materials of Examples 1 to 3 had sufficient antibacterial performance even after 30 washes. Furthermore, the fiber materials of Examples 1 and 3, which have a smaller specific surface area, showed a smaller degree of decrease in antibacterial activity value after repeated washing than the fiber material of Example 2, which indicates that they have less elution of zinc oxide particles and are more suitable as antibacterial fibers for use in applications where repeated washing is required. Furthermore, no discoloration was observed after alkali treatment in any of Examples 1 to 3, and the amount of hydrogen generated by the zinc oxide particles was also small. In contrast, the textile material of Comparative Example 1, which did not contain zinc oxide particles, did not exhibit antibacterial activity. Furthermore, the textile material of Comparative Example 2, which contained zinc oxide particles that had not been surface-treated with polysiloxane, exhibited a relatively high antibacterial activity value before washing, but the antibacterial activity value was lower than that of the textile materials of Examples 1 to 3, which contained polysiloxane-treated zinc oxide particles. This is thought to be because the zinc oxide particles were dissolved by the alkali treatment of the textile material. Furthermore, the antibacterial activity value significantly decreased after 30 washes, which is thought to be because a large amount of zinc oxide particles were eluted or shed by washing. The fiber material of Comparative Example 3 had a lower antibacterial activity value than the fiber materials of Examples 1 to 3 and Comparative Example 2. This is thought to be because the antibacterial activity was reduced due to the surface treatment of the zinc oxide particles with excess polysiloxane. In addition, the surface-treated zinc oxide particles of Comparative Example 3 also generated a large amount of hydrogen. The textile material of Comparative Example 4, in which polysiloxane was directly blended into polyethylene phthalate resin rather than used for surface treatment of zinc oxide particles, showed excellent antibacterial activity, but the antibacterial activity significantly decreased after washing. This is thought to be because, since the surfaces of the zinc oxide particles were not covered with silicone, a large amount of zinc oxide particles were eluted or fell off during washing. These results confirmed that zinc oxide particles surface-treated with a specified proportion of polysiloxane generate less hydrogen and sufficiently suppress troubles during the spinning process, and that blending these zinc oxide particles into fibers results in a fiber material that has excellent antibacterial properties and can maintain high antibacterial properties even after multiple washings. Furthermore, the results in Table 2 confirm that the fiber of the present invention also has high antiviral properties.

Claims

1. A fibrous material comprising a resin and zinc oxide particles, the zinc oxide particles are surface-treated with polysiloxane; the amount of the polysiloxane used for surface treatment is 0.6 to 3 parts by weight per 100 parts by weight of the zinc oxide particles before surface treatment; The amount of surface treatment (wt%) of the zinc oxide particles was calculated by multiplying the specific surface area (m ２ / g) is 0.07 to 0.

13.

2. 2. The fiber material according to claim 1, wherein the zinc oxide particles have an average primary particle diameter of 25 to 250 nm.

3. 3. The fiber material according to claim 1, wherein the fiber material has an antibacterial activity value of 2.2 or more in an antibacterial test conducted using Staphylococcus aureus and Klebsiella pneumoniae according to the method of JIS L1902:2015.

4. The fiber material according to any one of claims 1 to 3, characterized in that after being washed 30 times, the fiber material has an antibacterial activity value of 2.2 or more in an antibacterial test conducted using Staphylococcus aureus and Klebsiella pneumoniae according to the method of JIS L1902:2015.

5. The fiber material according to any one of claims 1 to 4, wherein the polysiloxane is at least one selected from the group consisting of dialkylpolysiloxane, methylhydrogenpolysiloxane, and (dimethicone / methicone) copolymer.

6. 6. The fiber material according to claim 1, wherein the resin has a contact angle with water at 25° C. of 60 to 105°.

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